/**
 * Main CSS for BaZi Calculator Application
 * Modern, responsive styling for the Four Pillars of Destiny calculator
 */

/* CSS Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--dark-color);
  background-color: var(--light-color);
  overflow-x: hidden;
  font-size: clamp(16px, 2.5vw, 18px);
}

/* CSS Variables for theming */
:root {
  /* Colors - Exact ziwei.pub specifications */
  --primary-color: #531dab; /* Primary Purple from analysis */
  --text-gray: #697b8c; /* Text Gray from analysis */
  --container-width: 1314px; /* Container width from analysis */
  --secondary-color: #6c757d;
  --success-color: #28a745;
  --danger-color: #dc3545;
  --warning-color: #ffc107;
  --info-color: #17a2b8;
  --light-color: #fafafa; /* Light grey background */
  --dark-color: #212121; /* Dark grey text */

  /* Five Elements Colors */
  --wood-color: #2e7d32; /* Green - Growth, creativity */
  --fire-color: #d32f2f; /* Red - Energy, passion */
  --earth-color: #f57c00; /* Orange/Yellow - Stability */
  --metal-color: #455a64; /* Blue-grey - Structure */
  --water-color: #1976d2; /* Blue - Flow, wisdom */

  /* Element Colors with Aliases */
  --element-wood: var(--wood-color);
  --element-fire: var(--fire-color);
  --element-earth: var(--earth-color);
  --element-metal: var(--metal-color);
  --element-water: var(--water-color);

  /* Element Light Colors */
  --element-wood-light: #e8f5e9;
  --element-fire-light: #ffebee;
  --element-earth-light: #fff3e0;
  --element-metal-light: #eceff1;
  --element-water-light: #e3f2fd;

  /* UI Variables for Components */
  --card-bg: #ffffff;
  --bg-secondary: #f5f5f5;
  --bg-tertiary: #e0e0e0;
  --bg-hover: #f0f0f0;
  --text-primary: var(--dark-color);
  --text-secondary: var(--text-gray);
  --border-color: #e0e0e0;
  --border-light: #f0f0f0;
  --primary: var(--primary-color);
  --primary-light: #f3e5f5;
  --success: var(--success-color);
  --success-light: #e8f5e9;
  --danger: var(--danger-color);
  --danger-light: #ffebee;
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;

  /* Typography */
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-xxl: 1.5rem;

  /* Border radius */
  --border-radius: 0.5rem;
  --border-radius-lg: 1rem;

  /* Shadows */
  --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);

  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
}

/* Dark theme variables */
body.dark-theme {
  --light-color: #212529;
  --dark-color: #f8f9fa;
  background-color: #1a1a1a;
  color: #e9ecef;
}

/* CSS Grid Layout System */
.app-container {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-areas:
    "header"
    "main"
    "footer";
}

/* Desktop Grid Layout (1200px+) */
@media (min-width: 1200px) {
  .main-content {
    display: grid;
    grid-template-columns: 250px 1fr;
    grid-template-areas: "sidebar content";
    gap: var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl);
  }

  .content-sidebar {
    grid-area: sidebar;
  }

  .content-main {
    grid-area: content;
  }
}

/* Container and Layout Components */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xxl);
}

.section-header h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
}

.section-description {
  font-size: clamp(1rem, 2.5vw, 1.125rem);
  color: var(--secondary-color);
  max-width: 600px;
  margin: 0 auto;
}

.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 -var(--spacing-sm);
}

.col {
  flex: 1;
  padding: 0 var(--spacing-sm);
}

/* Header Styles */
.app-header {
  grid-area: header;
  background: linear-gradient(135deg, var(--primary-color), var(--water-color));
  color: white;
  padding: var(--spacing-md) 0;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-container {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas: "logo nav user";
  align-items: center;
  gap: var(--spacing-md);
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

@media (max-width: 768px) {
  .header-container {
    grid-template-columns: auto auto;
    grid-template-areas:
      "logo toggle"
      "nav nav"
      "user user";
    gap: var(--spacing-sm);
  }

  .main-nav {
    grid-area: nav;
    display: none;
  }

  .main-nav.active {
    display: block;
  }
}

.logo {
  grid-area: logo;
}

.logo h1 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 700;
  margin: 0;
  background: linear-gradient(45deg, #fff, #e1bee7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 0.875rem;
  opacity: 0.9;
  margin: 0;
}

/* Mobile menu toggle */
.mobile-menu-toggle {
  grid-area: toggle;
  display: none;
  background: none;
  border: none;
  color: white;
  cursor: pointer;
  padding: var(--spacing-sm);
  flex-direction: column;
  gap: 3px;
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }
}

.hamburger-line {
  width: 20px;
  height: 2px;
  background-color: white;
  transition: all var(--transition-fast);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* Navigation */
.main-nav {
  grid-area: nav;
  justify-self: center;
}

.main-nav ul {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--spacing-md);
}

.main-nav li {
  position: relative;
}

.nav-link {
  color: white;
  text-decoration: none;
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  position: relative;
  display: block;
}

.nav-link:hover,
.nav-link:focus {
  background-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-1px);
}

.nav-link.active {
  background-color: rgba(255, 255, 255, 0.2);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  background-color: white;
  border-radius: 50%;
}

/* User Controls */
.user-controls {
  grid-area: user;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.premium-indicator {
  background: linear-gradient(45deg, #ffd700, #ffed4e);
  color: var(--primary-color);
  border: none;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.premium-indicator:hover {
  transform: scale(1.05);
  box-shadow: 0 2px 8px rgba(255, 215, 0, 0.3);
}

.premium-icon {
  font-size: 1rem;
}

.auth-buttons {
  display: flex;
  gap: var(--spacing-sm);
}

@media (max-width: 480px) {
  .auth-buttons {
    flex-direction: column;
    gap: var(--spacing-xs);
  }
}

/* Main Content */
.main-content {
  grid-area: main;
  min-height: calc(100vh - 200px);
  padding: var(--spacing-xl) 0;
}

.content-section {
  display: none;
  animation: fadeIn 0.3s ease-in-out;
}

.content-section.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Footer Styles */
.app-footer {
  grid-area: footer;
  background: linear-gradient(135deg, var(--dark-color), #424242);
  color: white;
  padding: var(--spacing-xxl) 0 var(--spacing-md);
  margin-top: var(--spacing-xxl);
}

.footer-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.footer-section h4 {
  margin-bottom: var(--spacing-md);
  color: var(--primary-color);
  font-size: 1.125rem;
  font-weight: 600;
}

.footer-section p {
  color: #bbb;
  margin-bottom: var(--spacing-md);
}

.footer-section ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-section li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: #adb5bd;
  text-decoration: none;
  transition: all var(--transition-fast);
  position: relative;
}

.footer-section a:hover,
.footer-section a:focus {
  color: white;
  transform: translateX(2px);
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.social-links a:hover {
  background-color: var(--primary-color);
  transform: translateY(-2px);
}

.footer-bottom {
  border-top: 1px solid #495057;
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-md);
  text-align: center;
  color: #adb5bd;
  font-size: 0.875rem;
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  font-weight: 500;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  line-height: 1.5;
  position: relative;
  overflow: hidden;
  min-height: 44px; /* Touch target size */
}

.btn::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition:
    width 0.6s,
    height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-sm);
  min-height: 36px;
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
  min-height: 52px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), #8e24aa);
  color: white;
  box-shadow: 0 2px 8px rgba(106, 27, 154, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(106, 27, 154, 0.4);
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: white;
}

.btn-secondary:hover {
  background-color: #5a6268;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-success {
  background-color: var(--success-color);
  color: white;
}

.btn-danger {
  background-color: var(--danger-color);
  color: white;
}

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

.btn-outline:hover {
  background-color: var(--primary-color);
  color: white;
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn:disabled:hover {
  transform: none;
  box-shadow: none;
}

.btn-icon {
  font-size: 1.2em;
  margin-left: var(--spacing-xs);
}

/* Form Styles */
.calculator-form {
  background: white;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-xl);
}

.form-help {
  background: linear-gradient(135deg, #e3f2fd, #f3e5f5);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-lg);
  border-left: 4px solid var(--primary-color);
}

.form-help p {
  margin: 0;
  color: var(--dark-color);
  font-size: var(--font-size-sm);
}

.form-fieldset {
  border: 1px solid #dee2e6;
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.form-fieldset legend {
  font-weight: 600;
  color: var(--primary-color);
  padding: 0 var(--spacing-sm);
}

/* ============================================
   CHART VISUALIZATION STYLES
   Professional styling for Chart.js components
   ============================================ */

/* Elements Chart Styles */
.elements-chart {
  background: white;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-xl);
}

.elements-chart .chart-container {
  position: relative;
  height: 400px;
  margin: var(--spacing-lg) 0;
}

.elements-chart .chart-controls {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.chart-toggle,
.chart-type-btn {
  padding: var(--spacing-xs) var(--spacing-md);
  border: 2px solid var(--primary-color);
  background: transparent;
  color: var(--primary-color);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
  min-height: 36px;
}

.chart-toggle:hover,
.chart-type-btn:hover,
.chart-toggle.active,
.chart-type-btn.active {
  background: var(--primary-color);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* Four Pillars Display Styles */
.four-pillars-display {
  background: white;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-xl);
}

.pillars-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.pillars-header h2 {
  color: var(--primary-color);
  margin: 0;
  font-size: var(--font-size-xxl);
  font-weight: 700;
}

.chart-controls {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

/* Pillar Container Layouts */
.pillars-container {
  margin-bottom: var(--spacing-xl);
}

.pillars-container.layout-horizontal {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.pillars-container.layout-vertical {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.pillars-container.layout-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

@media (max-width: 768px) {
  .pillars-container.layout-grid {
    grid-template-columns: 1fr;
  }
}

/* Pillar Card Styles */
.pillar-card {
  background: linear-gradient(145deg, #ffffff, #f8f9fa);
  border: 1px solid #e9ecef;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.pillar-card:hover,
.pillar-card.highlighted {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.pillar-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--wood-color),
    var(--fire-color),
    var(--earth-color),
    var(--metal-color),
    var(--water-color)
  );
}

.pillar-header {
  margin-bottom: var(--spacing-lg);
}

.pillar-header h3 {
  color: var(--primary-color);
  margin: 0 0 var(--spacing-xs) 0;
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.pillar-description {
  color: var(--secondary-color);
  font-size: var(--font-size-sm);
  margin: 0;
  line-height: 1.4;
}

.pillar-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.pillar-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.stem-section,
.branch-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  background: rgba(106, 27, 154, 0.05);
  border: 1px solid rgba(106, 27, 154, 0.1);
}

.stem-character,
.branch-character {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 80px;
}

.chinese {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--dark-color);
  margin-bottom: var(--spacing-xs);
}

.pinyin {
  font-size: var(--font-size-sm);
  color: var(--secondary-color);
  font-style: italic;
}

.english {
  font-size: var(--font-size-sm);
  color: var(--secondary-color);
  text-transform: capitalize;
}

.zodiac-symbol {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-xs);
}

.element-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.element-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: white;
  min-width: 60px;
}

.element-badge.wood {
  background: var(--wood-color);
}
.element-badge.fire {
  background: var(--fire-color);
}
.element-badge.earth {
  background: var(--earth-color);
}
.element-badge.metal {
  background: var(--metal-color);
}
.element-badge.water {
  background: var(--water-color);
}

.polarity,
.time-info {
  font-size: var(--font-size-sm);
  color: var(--secondary-color);
}

.pillar-chart {
  width: 120px;
  height: 120px;
  position: relative;
}

.pillar-details {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid #e9ecef;
}

.combination-text {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--primary-color);
  display: block;
  margin-bottom: var(--spacing-xs);
}

.combination-english {
  font-size: var(--font-size-sm);
  color: var(--secondary-color);
  text-transform: capitalize;
}

/* Pillars Summary Styles */
.pillars-summary {
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

.summary-item {
  text-align: center;
  padding: var(--spacing-md);
}

.summary-item h4 {
  color: var(--primary-color);
  margin: 0 0 var(--spacing-md) 0;
  font-size: var(--font-size-base);
  font-weight: 600;
}

.day-master,
.strongest-element {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
}

.day-master-info {
  font-size: var(--font-size-sm);
  color: var(--secondary-color);
}

.element-distribution {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.element-bar {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
}

.element-name {
  min-width: 50px;
  font-weight: 500;
  text-transform: capitalize;
}

.bar-container {
  flex: 1;
  height: 8px;
  background: #e9ecef;
  border-radius: 4px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  border-radius: 4px;
  transition: width var(--transition-normal);
}

.bar-fill.wood {
  background: var(--wood-color);
}
.bar-fill.fire {
  background: var(--fire-color);
}
.bar-fill.earth {
  background: var(--earth-color);
}
.bar-fill.metal {
  background: var(--metal-color);
}
.bar-fill.water {
  background: var(--water-color);
}

.element-percentage {
  min-width: 40px;
  font-weight: 600;
  color: var(--primary-color);
}

.balance-score {
  display: flex;
  justify-content: center;
}

.score-circle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), #8e24aa);
  color: white;
  font-weight: 700;
  position: relative;
}

.score-value {
  font-size: var(--font-size-xl);
}

.score-unit {
  font-size: var(--font-size-sm);
  opacity: 0.8;
}

/* Charts Section Styles */
.charts-section {
  margin-bottom: var(--spacing-xl);
}

.charts-section h3 {
  color: var(--primary-color);
  margin: 0 0 var(--spacing-lg) 0;
  font-size: var(--font-size-xl);
  font-weight: 600;
  text-align: center;
}

.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-lg);
}

.chart-container {
  position: relative;
  height: 300px;
  background: white;
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

/* Details Section Styles */
.details-section {
  margin-top: var(--spacing-xl);
}

.details-section h3 {
  color: var(--primary-color);
  margin: 0 0 var(--spacing-lg) 0;
  font-size: var(--font-size-xl);
  font-weight: 600;
  text-align: center;
}

.details-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.detail-card {
  background: white;
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid #e9ecef;
}

.detail-card h4 {
  color: var(--primary-color);
  margin: 0 0 var(--spacing-md) 0;
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.interaction-summary {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.interaction-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  background: rgba(106, 27, 154, 0.05);
}

.interaction-item .icon {
  font-size: 1.2em;
}

.interaction-item .label {
  flex: 1;
  font-weight: 500;
}

.interaction-item .count {
  font-weight: 600;
  color: var(--primary-color);
  background: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  min-width: 30px;
  text-align: center;
}

.pillar-connections {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.connection-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  background: rgba(106, 27, 154, 0.05);
}

.pillars {
  font-weight: 600;
  color: var(--primary-color);
}

.relationship {
  font-size: var(--font-size-sm);
  color: var(--secondary-color);
}

.season-info {
  text-align: center;
}

.season-name {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
}

.season-element {
  font-weight: 500;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-sm);
}

.season-description {
  font-size: var(--font-size-sm);
  color: var(--secondary-color);
  font-style: italic;
}

/* Compatibility Chart Styles */
.compatibility-chart {
  background: white;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-xl);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.chart-header h3 {
  color: var(--primary-color);
  margin: 0;
  font-size: var(--font-size-xl);
  font-weight: 600;
}

.charts-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.individual-charts {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

@media (max-width: 1024px) {
  .individual-charts {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
}

.person-chart {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.person-chart h4 {
  color: var(--primary-color);
  margin: 0 0 var(--spacing-md) 0;
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.chart-wrapper {
  position: relative;
  width: 300px;
  height: 300px;
  margin-bottom: var(--spacing-md);
}

.person-summary {
  background: rgba(106, 27, 154, 0.05);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  width: 100%;
  max-width: 300px;
}

.person-summary-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  text-align: left;
}

.person-summary-content .label {
  font-weight: 500;
  color: var(--secondary-color);
  margin-right: var(--spacing-sm);
}

.person-summary-content .score {
  font-weight: 600;
  color: var(--primary-color);
}

.harmony-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  border-radius: var(--border-radius-lg);
  border: 2px solid var(--primary-color);
  min-width: 200px;
}

.harmony-score {
  text-align: center;
}

.harmony-score .score-circle {
  width: 100px;
  height: 100px;
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-sm);
}

.harmony-label {
  font-weight: 600;
  color: var(--primary-color);
  font-size: var(--font-size-lg);
}

.harmony-indicators {
  width: 100%;
}

.indicators-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
}

.indicator-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--spacing-sm);
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.indicator-icon {
  font-size: 1.2em;
  margin-bottom: var(--spacing-xs);
}

.indicator-label {
  font-size: var(--font-size-sm);
  color: var(--secondary-color);
  margin-bottom: var(--spacing-xs);
}

.indicator-score {
  font-weight: 600;
  color: var(--primary-color);
  font-size: var(--font-size-sm);
}

.comparison-chart {
  text-align: center;
}

.comparison-chart h4 {
  color: var(--primary-color);
  margin: 0 0 var(--spacing-lg) 0;
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.comparison-chart .chart-wrapper {
  position: relative;
  height: 400px;
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
  background: white;
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

.harmony-matrix {
  text-align: center;
}

.harmony-matrix h4 {
  color: var(--primary-color);
  margin: 0 0 var(--spacing-lg) 0;
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.matrix-grid {
  display: flex;
  justify-content: center;
  overflow-x: auto;
  padding: var(--spacing-md);
}

.matrix-table {
  display: inline-block;
  border: 1px solid #e9ecef;
  border-radius: var(--border-radius);
  overflow: hidden;
  background: white;
  box-shadow: var(--shadow-sm);
}

.matrix-header,
.matrix-row {
  display: flex;
}

.matrix-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  border-right: 1px solid #e9ecef;
  border-bottom: 1px solid #e9ecef;
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.matrix-cell:last-child {
  border-right: none;
}

.matrix-row:last-child .matrix-cell {
  border-bottom: none;
}

.header-cell {
  background: var(--primary-color);
  color: white;
  font-weight: 600;
}

.row-header {
  background: rgba(106, 27, 154, 0.1);
  color: var(--primary-color);
  font-weight: 600;
}

.harmony-cell {
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.harmony-cell:hover {
  transform: scale(1.1);
  z-index: 10;
  box-shadow: var(--shadow-md);
}

.harmony-cell.productive {
  background: rgba(76, 175, 80, 0.3);
  border-color: #4caf50;
}

.harmony-cell.supportive {
  background: rgba(139, 195, 74, 0.3);
  border-color: #8bc34a;
}

.harmony-cell.same {
  background: rgba(158, 158, 158, 0.3);
  border-color: #9e9e9e;
}

.harmony-cell.destructive {
  background: rgba(244, 67, 54, 0.3);
  border-color: #f44336;
}

.harmony-cell.exhaustive {
  background: rgba(255, 152, 0, 0.3);
  border-color: #ff9800;
}

.harmony-cell.neutral {
  background: rgba(224, 224, 224, 0.3);
  border-color: #e0e0e0;
}

.harmony-symbol {
  font-size: 1.2em;
  font-weight: bold;
}

/* Placeholder Styles */
.four-pillars-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  border-radius: var(--border-radius-lg);
  border: 2px dashed #dee2e6;
  text-align: center;
  padding: var(--spacing-xl);
}

.placeholder-content h3 {
  color: var(--primary-color);
  margin: 0 0 var(--spacing-md) 0;
  font-size: var(--font-size-xl);
}

.placeholder-content p {
  color: var(--secondary-color);
  margin: 0 0 var(--spacing-lg) 0;
}

.placeholder-pillars {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

.placeholder-pillar {
  padding: var(--spacing-md) var(--spacing-lg);
  background: rgba(106, 27, 154, 0.1);
  border-radius: var(--border-radius);
  color: var(--primary-color);
  font-weight: 600;
  border: 1px dashed var(--primary-color);
}

/* Responsive Design for Charts */
@media (max-width: 768px) {
  .charts-grid {
    grid-template-columns: 1fr;
  }

  .chart-container {
    height: 250px;
  }

  .summary-grid {
    grid-template-columns: 1fr;
  }

  .pillars-container.layout-horizontal {
    grid-template-columns: 1fr;
  }

  .pillar-content {
    flex-direction: column;
    text-align: center;
  }

  .pillar-main {
    width: 100%;
  }

  .chart-wrapper {
    width: 250px !important;
    height: 250px !important;
  }

  .harmony-center {
    min-width: auto;
    width: 100%;
  }

  .indicators-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .matrix-cell {
    width: 50px;
    height: 50px;
    font-size: 0.75rem;
  }
}

@media (max-width: 480px) {
  .pillar-card {
    padding: var(--spacing-md);
  }

  .pillars-header {
    flex-direction: column;
    text-align: center;
  }

  .chart-controls {
    justify-content: center;
  }

  .indicators-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .matrix-cell {
    width: 40px;
    height: 40px;
    font-size: 0.7rem;
  }
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

@media (max-width: 600px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--dark-color);
  font-size: var(--font-size-base);
}

.form-control {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid #dee2e6;
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  transition: all var(--transition-fast);
  background-color: white;
  min-height: 44px; /* Touch target size */
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.2rem rgba(106, 27, 154, 0.15);
  transform: translateY(-1px);
}

.form-control:hover {
  border-color: #adb5bd;
}

.form-control.is-invalid {
  border-color: var(--danger-color);
  box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.15);
}

.form-control.is-valid {
  border-color: var(--success-color);
  box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.15);
}

.form-text {
  font-size: var(--font-size-sm);
  color: var(--secondary-color);
  margin-top: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.form-error {
  color: var(--danger-color);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.form-error::before {
  content: "⚠";
  font-size: 1em;
}

.form-actions {
  text-align: center;
  margin-top: var(--spacing-xxl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid #dee2e6;
}

/* Card Styles */
.card {
  background: white;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-lg);
  overflow: hidden;
  transition: box-shadow var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  padding: var(--spacing-lg);
  background-color: var(--light-color);
  border-bottom: 1px solid #dee2e6;
}

.card-body {
  padding: var(--spacing-lg);
}

.card-footer {
  padding: var(--spacing-lg);
  background-color: var(--light-color);
  border-top: 1px solid #dee2e6;
}

/* Modal Styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1050;
}

.modal {
  background: white;
  border-radius: var(--border-radius-lg);
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  border-bottom: 1px solid #dee2e6;
}

.modal-body {
  padding: var(--spacing-lg);
}

.close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  opacity: 0.5;
  transition: opacity var(--transition-fast);
}

.close-btn:hover {
  opacity: 1;
}

/* Enhanced Loading Spinners */
.loading-spinner-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(106, 27, 154, 0.9), rgba(25, 118, 210, 0.9));
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1100;
  backdrop-filter: blur(4px);
}

.loading-spinner {
  text-align: center;
  color: white;
  animation: fadeInUp 0.5s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* BaZi Five Elements Spinner */
.spinner-ring {
  display: inline-block;
  position: relative;
  width: 80px;
  height: 80px;
  margin-bottom: var(--spacing-lg);
}

.spinner-ring div {
  box-sizing: border-box;
  display: block;
  position: absolute;
  width: 64px;
  height: 64px;
  margin: 8px;
  border: 4px solid transparent;
  border-radius: 50%;
  animation: spinner-ring 1.2s cubic-bezier(0.5, 0, 0.5, 1) infinite;
}

.spinner-ring div:nth-child(1) {
  border-top-color: var(--wood-color);
  animation-delay: -0.45s;
}
.spinner-ring div:nth-child(2) {
  border-top-color: var(--fire-color);
  animation-delay: -0.3s;
}
.spinner-ring div:nth-child(3) {
  border-top-color: var(--earth-color);
  animation-delay: -0.15s;
}
.spinner-ring div:nth-child(4) {
  border-top-color: var(--metal-color);
  animation-delay: 0s;
}
.spinner-ring div:nth-child(5) {
  border-top-color: var(--water-color);
  animation-delay: 0.15s;
}

@keyframes spinner-ring {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.loading-text {
  margin-top: var(--spacing-md);
  font-size: var(--font-size-lg);
  font-weight: 500;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

/* Inline Loading Spinners */
.loading-spinner-inline {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.spinner-small {
  display: inline-block;
  position: relative;
  width: 20px;
  height: 20px;
}

.spinner-small div {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 2px solid var(--primary-color);
  border-radius: 50%;
  border-top-color: transparent;
  animation: smallSpin 1s linear infinite;
}

.spinner-small div:nth-child(2) {
  animation-delay: 0.3s;
  border-color: var(--fire-color);
  border-top-color: transparent;
}

.spinner-small div:nth-child(3) {
  animation-delay: 0.6s;
  border-color: var(--water-color);
  border-top-color: transparent;
}

@keyframes smallSpin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Skeleton Loading Screens */
.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--border-radius);
}

@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

.skeleton-pillar {
  height: 120px;
  margin-bottom: var(--spacing-md);
}

.skeleton-text {
  height: 16px;
  margin-bottom: var(--spacing-sm);
}

.skeleton-text.wide {
  width: 80%;
}

.skeleton-text.narrow {
  width: 60%;
}

/* Progress Indicators */
.progress-bar {
  width: 100%;
  height: 8px;
  background-color: rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  overflow: hidden;
  margin-top: var(--spacing-md);
}

.progress-fill {
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--wood-color),
    var(--fire-color),
    var(--earth-color),
    var(--metal-color),
    var(--water-color)
  );
  border-radius: 4px;
  transition: width 0.3s ease;
  position: relative;
}

.progress-fill::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: progressShine 2s infinite;
}

@keyframes progressShine {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

/* Chart Loading Animation */
.chart-loading {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 200px;
  flex-direction: column;
  gap: var(--spacing-md);
}

.chart-spinner {
  width: 60px;
  height: 60px;
  position: relative;
}

.chart-spinner div {
  position: absolute;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  animation: chartDots 1.5s infinite;
}

.chart-spinner div:nth-child(1) {
  background: var(--wood-color);
  top: 8px;
  left: 8px;
  animation-delay: 0s;
}

.chart-spinner div:nth-child(2) {
  background: var(--fire-color);
  top: 8px;
  right: 8px;
  animation-delay: 0.3s;
}

.chart-spinner div:nth-child(3) {
  background: var(--earth-color);
  bottom: 8px;
  right: 8px;
  animation-delay: 0.6s;
}

.chart-spinner div:nth-child(4) {
  background: var(--metal-color);
  bottom: 8px;
  left: 8px;
  animation-delay: 0.9s;
}

.chart-spinner div:nth-child(5) {
  background: var(--water-color);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: 1.2s;
}

@keyframes chartDots {
  0%,
  20% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.5);
    opacity: 0.7;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

/* Error Display System */
.error-notifications {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1200;
  max-width: 400px;
  pointer-events: none;
}

.error-notification {
  background: white;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
  pointer-events: auto;
  animation: errorSlideIn 0.3s ease-out;
  position: relative;
}

@keyframes errorSlideIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.error-notification.removing {
  animation: errorSlideOut 0.3s ease-in forwards;
}

@keyframes errorSlideOut {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(100%);
  }
}

.error-notification-header {
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
}

.error-notification-body {
  padding: 0 var(--spacing-lg) var(--spacing-md);
  color: var(--dark-color);
  font-size: var(--font-size-sm);
  line-height: 1.5;
}

.error-notification.error {
  border-left: 4px solid var(--danger-color);
}

.error-notification.error .error-notification-header {
  color: var(--danger-color);
  background: rgba(220, 53, 69, 0.05);
}

.error-notification.warning {
  border-left: 4px solid var(--warning-color);
}

.error-notification.warning .error-notification-header {
  color: #856404;
  background: rgba(255, 193, 7, 0.05);
}

.error-notification.info {
  border-left: 4px solid var(--info-color);
}

.error-notification.info .error-notification-header {
  color: var(--info-color);
  background: rgba(23, 162, 184, 0.05);
}

.error-notification.success {
  border-left: 4px solid var(--success-color);
}

.error-notification.success .error-notification-header {
  color: var(--success-color);
  background: rgba(40, 167, 69, 0.05);
}

.error-icon {
  font-size: 1.2em;
  margin-right: var(--spacing-sm);
}

.error-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  opacity: 0.5;
  transition: opacity var(--transition-fast);
  padding: 0;
  line-height: 1;
}

.error-close:hover {
  opacity: 1;
}

/* Form Error States */
.form-group.has-error .form-control {
  border-color: var(--danger-color);
  box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.15);
}

.form-group.has-error .form-label {
  color: var(--danger-color);
}

.form-error {
  color: var(--danger-color);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  animation: errorShake 0.5s ease-in-out;
}

@keyframes errorShake {
  0%,
  100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-5px);
  }
  75% {
    transform: translateX(5px);
  }
}

.form-error::before {
  content: "⚠";
  font-size: 1em;
  color: var(--danger-color);
}

/* Global Error States */
.error-container {
  background: white;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
  margin: var(--spacing-xl) 0;
  border: 1px solid #fee;
  box-shadow: var(--shadow-sm);
}

.error-container.critical {
  border-color: var(--danger-color);
  background: linear-gradient(135deg, #fef5e7, #fdeaea);
}

.error-icon-large {
  font-size: 3rem;
  color: var(--danger-color);
  margin-bottom: var(--spacing-md);
  animation: errorPulse 2s infinite;
}

@keyframes errorPulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.1);
    opacity: 0.8;
  }
}

.error-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--danger-color);
  margin-bottom: var(--spacing-sm);
}

.error-message {
  color: var(--dark-color);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

.error-actions {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

/* Validation States */
.form-control.is-valid {
  border-color: var(--success-color);
  box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.15);
}

.form-control.is-valid + .form-feedback {
  color: var(--success-color);
}

.form-control.is-valid + .form-feedback::before {
  content: "✓";
  color: var(--success-color);
}

.form-feedback {
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

/* Network Error States */
.network-error {
  background: linear-gradient(135deg, #fff3cd, #ffeaa7);
  border: 1px solid var(--warning-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  margin: var(--spacing-md) 0;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.network-error-icon {
  font-size: 1.5rem;
  color: #856404;
}

.network-error-content {
  flex: 1;
}

.network-error-title {
  font-weight: 600;
  color: #856404;
  margin-bottom: var(--spacing-xs);
}

.network-error-message {
  color: #856404;
  font-size: var(--font-size-sm);
}

.retry-button {
  background: var(--warning-color);
  color: #856404;
  border: none;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.retry-button:hover {
  background: #e0a800;
  transform: translateY(-1px);
}

/* Browser Compatibility Warnings */
.browser-warning {
  background: linear-gradient(135deg, #d1ecf1, #bee5eb);
  border: 1px solid var(--info-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.browser-warning-icon {
  font-size: 1.5rem;
  color: var(--info-color);
}

.browser-warning-content {
  flex: 1;
}

.browser-warning-title {
  font-weight: 600;
  color: var(--info-color);
  margin-bottom: var(--spacing-xs);
}

.browser-warning-message {
  color: #0c5460;
  font-size: var(--font-size-sm);
}

/* Calculation Error States */
.calculation-error {
  background: white;
  border: 2px solid var(--danger-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  text-align: center;
  position: relative;
}

.calculation-error::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  right: -1px;
  bottom: -1px;
  background: linear-gradient(45deg, var(--danger-color), #ff6b6b);
  border-radius: var(--border-radius-lg);
  z-index: -1;
  animation: errorGlow 2s ease-in-out infinite alternate;
}

@keyframes errorGlow {
  0% {
    opacity: 0.5;
  }
  100% {
    opacity: 0.8;
  }
}

.calculation-error-icon {
  font-size: 2.5rem;
  color: var(--danger-color);
  margin-bottom: var(--spacing-md);
}

.calculation-error-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--danger-color);
  margin-bottom: var(--spacing-sm);
}

.calculation-error-message {
  color: var(--dark-color);
  margin-bottom: var(--spacing-lg);
  line-height: 1.5;
}

/* Mobile Error Adaptations */
@media (max-width: 768px) {
  .error-notifications {
    top: 10px;
    right: 10px;
    left: 10px;
    max-width: none;
  }

  .error-notification {
    margin-bottom: var(--spacing-sm);
  }

  .error-container {
    padding: var(--spacing-lg);
    margin: var(--spacing-md) 0;
  }

  .error-actions {
    flex-direction: column;
    align-items: center;
  }

  .network-error,
  .browser-warning {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-sm);
  }
}

/* High contrast mode error adaptations */
@media (prefers-contrast: high) {
  .error-notification {
    border: 2px solid currentColor;
  }

  .form-error,
  .error-title,
  .calculation-error-title {
    font-weight: 700;
  }
}

/* Reduced motion adaptations */
@media (prefers-reduced-motion: reduce) {
  .error-notification {
    animation: none;
  }

  .error-icon-large,
  .form-error {
    animation: none;
  }

  .calculation-error::before {
    animation: none;
    opacity: 0.6;
  }
}

/* Element Colors and Theming */
.element-wood {
  color: var(--wood-color);
}
.element-fire {
  color: var(--fire-color);
}
.element-earth {
  color: var(--earth-color);
}
.element-metal {
  color: var(--metal-color);
}
.element-water {
  color: var(--water-color);
}

.bg-element-wood {
  background-color: var(--wood-color);
}
.bg-element-fire {
  background-color: var(--fire-color);
}
.bg-element-earth {
  background-color: var(--earth-color);
}
.bg-element-metal {
  background-color: var(--metal-color);
}
.bg-element-water {
  background-color: var(--water-color);
}

/* Element gradients */
.gradient-wood {
  background: linear-gradient(135deg, var(--wood-color), #66bb6a);
}
.gradient-fire {
  background: linear-gradient(135deg, var(--fire-color), #f44336);
}
.gradient-earth {
  background: linear-gradient(135deg, var(--earth-color), #ff9800);
}
.gradient-metal {
  background: linear-gradient(135deg, var(--metal-color), #607d8b);
}
.gradient-water {
  background: linear-gradient(135deg, var(--water-color), #2196f3);
}

/* Element-specific animations */
@keyframes woodGrow {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes fireFlicker {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.8;
  }
}

@keyframes earthPulse {
  0% {
    box-shadow: 0 0 0 0 rgba(245, 124, 0, 0.4);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(245, 124, 0, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(245, 124, 0, 0);
  }
}

@keyframes metalShine {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

@keyframes waterFlow {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-2px);
  }
  100% {
    transform: translateY(0);
  }
}

.element-wood:hover {
  animation: woodGrow 2s infinite;
}
.element-fire:hover {
  animation: fireFlicker 1s infinite;
}
.element-earth:hover {
  animation: earthPulse 2s infinite;
}
.element-water:hover {
  animation: waterFlow 2s infinite;
}

.element-metal:hover {
  position: relative;
  overflow: hidden;
}

.element-metal:hover::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  animation: metalShine 1.5s infinite;
}

/* Utility Classes */
.text-center {
  text-align: center;
}
.text-left {
  text-align: left;
}
.text-right {
  text-align: right;
}

.d-none {
  display: none !important;
}
.d-block {
  display: block !important;
}
.d-flex {
  display: flex !important;
}
.d-grid {
  display: grid !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--dark-color);
  color: white;
  padding: 8px 16px;
  text-decoration: none;
  z-index: 100000;
  border-radius: var(--border-radius);
  font-weight: 500;
}

.skip-link:focus {
  top: 6px;
}

/* Spacing utilities */
.mt-1 {
  margin-top: var(--spacing-xs);
}
.mt-2 {
  margin-top: var(--spacing-sm);
}
.mt-3 {
  margin-top: var(--spacing-md);
}
.mt-4 {
  margin-top: var(--spacing-lg);
}
.mt-5 {
  margin-top: var(--spacing-xl);
}

.mb-1 {
  margin-bottom: var(--spacing-xs);
}
.mb-2 {
  margin-bottom: var(--spacing-sm);
}
.mb-3 {
  margin-bottom: var(--spacing-md);
}
.mb-4 {
  margin-bottom: var(--spacing-lg);
}
.mb-5 {
  margin-bottom: var(--spacing-xl);
}

.p-1 {
  padding: var(--spacing-xs);
}
.p-2 {
  padding: var(--spacing-sm);
}
.p-3 {
  padding: var(--spacing-md);
}
.p-4 {
  padding: var(--spacing-lg);
}
.p-5 {
  padding: var(--spacing-xl);
}

/* Focus indicators */
.focus-ring:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .btn {
    border: 2px solid currentColor;
  }

  .form-control {
    border-width: 2px;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .btn::before {
    display: none;
  }
}

/* ============================================
   ADVANCED MOBILE OPTIMIZATIONS
   Comprehensive mobile-first enhancements
   ============================================ */

/* Small mobile devices (320px and below) */
@media (max-width: 320px) {
  .container {
    padding: 0 var(--spacing-xs);
  }

  .calculator-form {
    padding: var(--spacing-md);
    margin: var(--spacing-sm) 0;
  }

  .pillar {
    padding: var(--spacing-sm);
  }

  .btn {
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm);
    width: 100%;
    margin-bottom: var(--spacing-xs);
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: var(--spacing-xs);
  }

  .header-container {
    padding: 0 var(--spacing-xs);
  }

  .pillars-container {
    gap: var(--spacing-xs);
  }
}

/* Enhanced touch optimizations */
@media (pointer: coarse) {
  /* Larger touch targets for better usability */
  .btn,
  .form-control,
  .nav-link,
  .chart-toggle,
  .chart-type-btn {
    min-height: 48px;
    min-width: 48px;
  }

  /* Enhanced button padding for touch */
  .btn {
    padding: var(--spacing-md) var(--spacing-lg);
  }

  .btn-sm {
    min-height: 44px;
    padding: var(--spacing-sm) var(--spacing-md);
  }

  /* Form controls with better touch experience */
  .form-control {
    padding: var(--spacing-md);
    border-width: 2px;
  }

  /* Navigation with touch-friendly spacing */
  .nav-link {
    padding: var(--spacing-md) var(--spacing-lg);
    margin: var(--spacing-xs);
  }

  /* Chart controls with touch optimization */
  .chart-toggle,
  .chart-type-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    margin: var(--spacing-xs);
  }
}

/* Mobile-specific interactions */
@media (max-width: 768px) {
  /* Improved form layouts for mobile */
  .form-fieldset {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
  }

  .form-group {
    margin-bottom: var(--spacing-md);
  }

  /* Mobile-optimized pillar layout */
  .pillars-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .pillar-content {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-sm);
  }

  /* Mobile navigation improvements */
  .main-nav {
    width: 100%;
    margin-top: var(--spacing-md);
  }

  .main-nav ul {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .nav-link {
    display: block;
    text-align: center;
    border-radius: var(--border-radius);
    background: rgba(255, 255, 255, 0.1);
  }

  /* Mobile header optimizations */
  .header-container {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .logo h1 {
    font-size: var(--font-size-lg);
  }

  .subtitle {
    font-size: 0.75rem;
  }

  /* Mobile form optimizations */
  .calculator-form {
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
  }

  /* Mobile chart optimizations */
  .elements-chart {
    padding: var(--spacing-md);
  }

  .chart-container {
    height: 250px;
  }

  .chart-controls {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-xs);
  }

  /* Mobile modal optimizations */
  .modal {
    width: 95%;
    max-height: 90vh;
    margin: 5vh auto;
  }

  .modal-header,
  .modal-body {
    padding: var(--spacing-md);
  }
}

/* Landscape mobile optimizations */
@media (max-width: 768px) and (orientation: landscape) {
  .main-content {
    padding: var(--spacing-md) 0;
  }

  .calculator-form {
    max-width: 100%;
  }

  .pillars-container {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
  }

  .form-row {
    grid-template-columns: repeat(3, 1fr);
  }

  .app-header {
    padding: var(--spacing-sm) 0;
  }

  .header-container {
    gap: var(--spacing-sm);
  }
}

/* Safe area support for devices with notches */
@supports (padding: max(0px)) {
  .app-header {
    padding-left: max(var(--spacing-md), env(safe-area-inset-left));
    padding-right: max(var(--spacing-md), env(safe-area-inset-right));
    padding-top: max(var(--spacing-md), env(safe-area-inset-top));
  }

  .main-content {
    padding-left: max(var(--spacing-md), env(safe-area-inset-left));
    padding-right: max(var(--spacing-md), env(safe-area-inset-right));
  }

  .app-footer {
    padding-left: max(var(--spacing-md), env(safe-area-inset-left));
    padding-right: max(var(--spacing-md), env(safe-area-inset-right));
    padding-bottom: max(var(--spacing-md), env(safe-area-inset-bottom));
  }
}

/* Enhanced pull-to-refresh styling */
@media (max-width: 768px) {
  body {
    overscroll-behavior-y: contain;
  }

  .main-content {
    overscroll-behavior: contain;
  }
}

/* Mobile-specific loading states */
@media (max-width: 768px) {
  .loading-spinner-overlay {
    backdrop-filter: blur(2px);
  }

  .loading-content {
    padding: var(--spacing-lg);
  }

  .loading-text {
    font-size: var(--font-size-base);
  }
}

/* Mobile error notifications */
@media (max-width: 768px) {
  .error-notifications {
    top: 10px;
    right: 10px;
    left: 10px;
    max-width: none;
  }

  .error-notification {
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
  }
}

/* Gesture support indicators */
.swipe-indicator {
  display: none;
}

@media (max-width: 768px) and (pointer: coarse) {
  .swipe-indicator {
    display: block;
    position: absolute;
    bottom: var(--spacing-sm);
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.6);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    animation: fadeInOut 3s ease-in-out;
  }
}

@keyframes fadeInOut {
  0%,
  100% {
    opacity: 0;
  }
  20%,
  80% {
    opacity: 1;
  }
}

/* Mobile-optimized tables and data display */
@media (max-width: 768px) {
  .matrix-table {
    font-size: 0.75rem;
  }

  .matrix-cell {
    width: 40px;
    height: 40px;
  }

  .harmony-matrix {
    overflow-x: auto;
    padding: var(--spacing-sm);
  }

  .compatibility-chart {
    padding: var(--spacing-md);
  }
}

/* Improved mobile typography */
@media (max-width: 768px) {
  body {
    font-size: clamp(14px, 3.5vw, 16px);
    line-height: 1.5;
  }

  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    line-height: 1.3;
    word-wrap: break-word;
    hyphens: auto;
  }

  .section-header h2 {
    font-size: clamp(1.5rem, 5vw, 2rem);
  }

  .section-description {
    font-size: clamp(0.9rem, 3vw, 1rem);
  }
}

/* Mobile-specific animations */
@media (max-width: 768px) and (prefers-reduced-motion: no-preference) {
  .pillar {
    transition:
      transform 0.2s ease,
      box-shadow 0.2s ease;
  }

  .btn {
    transition:
      transform 0.1s ease,
      background-color 0.2s ease;
  }

  .btn:active {
    transform: scale(0.98);
  }

  .form-control:focus {
    transition:
      border-color 0.2s ease,
      box-shadow 0.2s ease;
  }
}

/* Mobile accessibility improvements */
@media (max-width: 768px) {
  .skip-link {
    top: -50px;
    left: 10px;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
  }

  .skip-link:focus {
    top: 10px;
  }

  /* Focus indicators for touch devices */
  .btn:focus,
  .form-control:focus,
  .nav-link:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
  }
}

/* Performance optimizations for mobile */
@media (max-width: 768px) {
  /* Reduce complexity for mobile */
  .gradient-wood,
  .gradient-fire,
  .gradient-earth,
  .gradient-metal,
  .gradient-water {
    background: var(--wood-color);
  }

  .gradient-fire {
    background: var(--fire-color);
  }
  .gradient-earth {
    background: var(--earth-color);
  }
  .gradient-metal {
    background: var(--metal-color);
  }
  .gradient-water {
    background: var(--water-color);
  }

  /* Simplify shadows on mobile for better performance */
  .card,
  .pillar,
  .calculator-form,
  .elements-chart {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  }

  /* Reduce animation complexity */
  .btn::before {
    display: none;
  }
}

/* iOS specific optimizations */
@supports (-webkit-touch-callout: none) {
  /* iOS Safari specific styles */
  .form-control {
    -webkit-appearance: none;
    border-radius: var(--border-radius);
  }

  select.form-control {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 12px center;
    background-repeat: no-repeat;
    background-size: 16px 12px;
    padding-right: 40px;
  }

  .btn {
    -webkit-appearance: none;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
  }
}

/* Android specific optimizations */
@media (max-width: 768px) {
  /* Android Chrome address bar handling */
  .app-container {
    min-height: 100vh;
    min-height: -webkit-fill-available;
  }

  html {
    height: -webkit-fill-available;
  }
}

/* High DPI mobile displays */
@media (max-width: 768px) and (-webkit-min-device-pixel-ratio: 2) {
  .loading-spinner-initial,
  .spinner-ring div {
    border-width: 1px;
  }

  .form-control {
    border-width: 1px;
  }
}

/* Mobile landscape specific adjustments */
@media (max-width: 1024px) and (orientation: landscape) and (max-height: 600px) {
  .app-header {
    padding: var(--spacing-xs) 0;
  }

  .main-content {
    padding: var(--spacing-sm) 0;
  }

  .section-header {
    margin-bottom: var(--spacing-lg);
  }

  .calculator-form {
    padding: var(--spacing-md);
  }

  .modal {
    max-height: 85vh;
  }
}

/* ============================================
   SAVED CHARTS MANAGER STYLES
   Complete styling for the charts management UI
   ============================================ */

.saved-charts-manager {
  background: white;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-xl);
  overflow: hidden;
}

/* Header Styles */
.saved-charts-header {
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  padding: var(--spacing-lg);
  border-bottom: 1px solid #dee2e6;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.charts-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin: 0;
  color: var(--primary-color);
  font-size: var(--font-size-xl);
  font-weight: 600;
}

.title-icon {
  font-size: 1.2em;
}

.charts-count {
  font-size: var(--font-size-sm);
  color: var(--secondary-color);
  font-weight: normal;
}

.header-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* Toolbar Styles */
.charts-toolbar {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  flex-wrap: wrap;
}

.search-container {
  position: relative;
  flex: 1;
  min-width: 200px;
}

.search-input {
  padding-left: 40px;
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--secondary-color);
  pointer-events: none;
}

.filter-controls {
  display: flex;
  gap: var(--spacing-xs);
  align-items: center;
}

.sort-select {
  min-width: 100px;
}

.sort-order-btn,
.filter-btn {
  position: relative;
}

.filter-count {
  position: absolute;
  top: -8px;
  right: -8px;
  background: var(--danger-color);
  color: white;
  border-radius: 50%;
  width: 18px;
  height: 18px;
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

/* Advanced Filters */
.advanced-filters {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: white;
  border-radius: var(--border-radius);
  border: 1px solid #dee2e6;
}

.filter-section {
  margin-bottom: var(--spacing-md);
}

.filter-section label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--dark-color);
}

.date-range {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  flex-wrap: wrap;
}

.date-input {
  max-width: 150px;
}

.date-separator {
  color: var(--secondary-color);
  font-weight: 500;
}

.tags-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.tag-filter-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: #f8f9fa;
  border-radius: var(--border-radius);
  border: 1px solid #dee2e6;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tag-filter-label:hover {
  background: #e9ecef;
  border-color: var(--primary-color);
}

.tag-filter {
  margin: 0;
}

.tag-name {
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.filter-actions {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: flex-end;
  margin-top: var(--spacing-lg);
}

/* Charts Container */
.charts-container {
  padding: var(--spacing-lg);
  min-height: 300px;
}

.charts-loading {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 200px;
}

.charts-empty {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 300px;
}

.empty-state {
  text-align: center;
  max-width: 400px;
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.6;
}

.empty-state h4 {
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-lg);
}

.empty-state p {
  color: var(--secondary-color);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

/* Charts Grid */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--spacing-lg);
}

.saved-charts-manager.list-view .charts-grid {
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

/* Chart Card Styles */
.chart-card {
  background: white;
  border: 1px solid #dee2e6;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.chart-card:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.chart-card.selected {
  border-color: var(--primary-color);
  background: rgba(106, 27, 154, 0.05);
}

.chart-card.list-view {
  padding: var(--spacing-md);
}

.chart-card-header {
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
  margin-bottom: var(--spacing-md);
}

.chart-select {
  flex-shrink: 0;
}

.chart-checkbox {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

.chart-info {
  flex: 1;
  min-width: 0;
}

.chart-name {
  margin: 0 0 var(--spacing-xs) 0;
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--primary-color);
  word-wrap: break-word;
}

.chart-meta {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.chart-date,
.birth-date {
  font-size: var(--font-size-sm);
  color: var(--secondary-color);
}

.chart-actions {
  display: flex;
  gap: var(--spacing-xs);
  flex-shrink: 0;
}

.action-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border-radius: var(--border-radius);
}

.action-btn:hover {
  transform: scale(1.05);
}

/* Chart Preview */
.chart-preview {
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-md);
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  border-radius: var(--border-radius);
}

.pillars-mini {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
}

.mini-pillar {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 40px;
}

.mini-stem,
.mini-branch {
  width: 32px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 4px;
}

.mini-stem {
  background: rgba(106, 27, 154, 0.1);
  color: var(--primary-color);
  margin-bottom: 2px;
}

.mini-branch {
  background: var(--primary-color);
  color: white;
}

/* Chart Tags */
.chart-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.chart-tag {
  background: var(--primary-color);
  color: white;
  padding: 2px var(--spacing-xs);
  border-radius: var(--border-radius);
  font-size: 0.75rem;
  font-weight: 500;
}

/* Bulk Actions Bar */
.bulk-actions-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: white;
  border-top: 1px solid #dee2e6;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
  from {
    transform: translateY(100%);
  }
  to {
    transform: translateY(0);
  }
}

.bulk-actions-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  max-width: 1200px;
  margin: 0 auto;
}

.selected-count {
  font-weight: 600;
  color: var(--primary-color);
}

.bulk-buttons {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* Touch Interactions */
.touch-active {
  transform: scale(0.98);
  opacity: 0.8;
}

.touch-ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.6);
  transform: scale(0);
  pointer-events: none;
  width: 20px;
  height: 20px;
  margin-left: -10px;
  margin-top: -10px;
}

.touch-ripple-active {
  animation: ripple 0.6s linear;
}

@keyframes ripple {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* Section Transitions */
.section-exit {
  animation: slideOutLeft 0.3s ease-in-out;
}

.section-enter {
  animation: slideInRight 0.3s ease-in-out;
}

@keyframes slideOutLeft {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(-100%);
    opacity: 0;
  }
}

@keyframes slideInRight {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Pull to Refresh Indicators */
.pulling {
  transform: translateY(calc(var(--pull-progress, 0) * 20px));
  transition: transform 0.1s ease;
}

.pulling::before {
  content: "↓";
  position: absolute;
  top: -30px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 1.5rem;
  color: var(--primary-color);
  opacity: var(--pull-progress, 0);
}

.pull-ready::before {
  content: "↻";
  animation: spin 1s linear infinite;
}

/* Mobile Responsive Adjustments */
@media (max-width: 768px) {
  .saved-charts-manager {
    margin: 0 calc(-1 * var(--spacing-md));
    border-radius: 0;
  }

  .saved-charts-header {
    padding: var(--spacing-md);
  }

  .header-top {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-sm);
  }

  .header-actions {
    justify-content: center;
  }

  .charts-toolbar {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .search-container {
    min-width: auto;
  }

  .filter-controls {
    justify-content: center;
    flex-wrap: wrap;
  }

  .charts-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .chart-card {
    padding: var(--spacing-md);
  }

  .chart-actions {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .bulk-actions-content {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }

  .bulk-buttons {
    justify-content: center;
  }

  .advanced-filters {
    padding: var(--spacing-md);
  }

  .date-range {
    flex-direction: column;
    align-items: stretch;
  }

  .date-input {
    max-width: none;
  }

  .filter-actions {
    justify-content: stretch;
  }

  .filter-actions .btn {
    flex: 1;
  }
}

@media (max-width: 480px) {
  .charts-title {
    font-size: var(--font-size-lg);
  }

  .chart-card-header {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .chart-actions {
    flex-direction: row;
    justify-content: center;
  }

  .pillars-mini {
    gap: var(--spacing-xs);
  }

  .mini-pillar {
    min-width: 32px;
  }

  .mini-stem,
  .mini-branch {
    width: 28px;
    height: 20px;
    font-size: 0.7rem;
  }
}

/* ============================================
   UPDATE NOTIFICATIONS AND PWA STYLES
   App update notifications and PWA-specific UI
   ============================================ */

.update-notification {
  position: fixed;
  top: 20px;
  right: 20px;
  left: 20px;
  max-width: 400px;
  margin: 0 auto;
  background: white;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  border: 2px solid var(--primary-color);
  z-index: 2000;
  animation: slideInDown 0.3s ease-out;
}

@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateY(-100%);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.update-content {
  padding: var(--spacing-lg);
  text-align: center;
}

.update-content p {
  margin: 0 0 var(--spacing-md) 0;
  color: var(--dark-color);
  font-weight: 500;
}

.update-content .btn {
  margin: 0 var(--spacing-xs);
}

/* PWA Install Prompt */
.install-prompt {
  position: fixed;
  bottom: 20px;
  left: 20px;
  right: 20px;
  max-width: 400px;
  margin: 0 auto;
  background: linear-gradient(135deg, var(--primary-color), #8e24aa);
  color: white;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-lg);
  z-index: 1500;
  animation: slideInUp 0.3s ease-out;
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(100%);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.install-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.install-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.install-text {
  flex: 1;
}

.install-title {
  font-weight: 600;
  margin: 0 0 var(--spacing-xs) 0;
  font-size: var(--font-size-base);
}

.install-description {
  margin: 0;
  opacity: 0.9;
  font-size: var(--font-size-sm);
}

.install-actions {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.install-actions .btn {
  background: white;
  color: var(--primary-color);
  border: none;
  font-weight: 600;
}

.install-actions .btn:hover {
  background: #f8f9fa;
}

/* Offline Indicator */
.offline-indicator {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--warning-color);
  color: #856404;
  text-align: center;
  padding: var(--spacing-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
  z-index: 1600;
  transform: translateY(-100%);
  transition: transform var(--transition-normal);
}

.offline-indicator.show {
  transform: translateY(0);
}

.offline-indicator .icon {
  margin-right: var(--spacing-xs);
}

/* Loading States for PWA */
.app-loading {
  pointer-events: none;
}

.app-loading::after {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.8);
  z-index: 1400;
  backdrop-filter: blur(2px);
}

/* iOS PWA specific styles */
@media (display-mode: standalone) {
  body {
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
  }

  .app-header {
    padding-top: max(var(--spacing-md), env(safe-area-inset-top));
  }

  /* Hide address bar space */
  html {
    height: 100vh;
    height: -webkit-fill-available;
  }

  .app-container {
    min-height: 100vh;
    min-height: -webkit-fill-available;
  }
}

/* Dark theme for PWA */
@media (prefers-color-scheme: dark) and (display-mode: standalone) {
  .update-notification {
    background: #2a2a2a;
    border-color: #8e24aa;
    color: #e9ecef;
  }

  .install-prompt {
    background: linear-gradient(135deg, #8e24aa, #6a1b9a);
  }

  .offline-indicator {
    background: #856404;
    color: #fff3cd;
  }
}

/* Performance optimizations for animations */
@media (prefers-reduced-motion: reduce) {
  .update-notification,
  .install-prompt {
    animation: none;
  }

  .offline-indicator {
    transition: none;
  }
}

/* Touch device optimizations */
@media (pointer: coarse) {
  .btn {
    min-height: 48px;
    padding: var(--spacing-md) var(--spacing-lg);
  }

  .form-control {
    min-height: 48px;
    padding: var(--spacing-md);
  }

  .nav-link {
    padding: var(--spacing-md) var(--spacing-lg);
  }

  /* Larger tap targets */
  a,
  button,
  input,
  select {
    min-height: 44px;
  }
}

/* Landscape tablet optimizations */
@media (min-width: 768px) and (max-width: 1024px) and (orientation: landscape) {
  .main-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
  }

  .calculator-form {
    position: sticky;
    top: var(--spacing-lg);
    height: fit-content;
  }
}

/* High DPI display optimizations */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .loading-spinner-initial,
  .spinner-ring div {
    border-width: 1px;
  }

  .legend-color {
    border-width: 1px;
  }
}

/* Tablet portrait optimizations */
@media (min-width: 768px) and (max-width: 1024px) and (orientation: portrait) {
  .pillars-container {
    grid-template-columns: repeat(2, 1fr);
  }

  .form-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Large mobile optimizations */
@media (min-width: 480px) and (max-width: 767px) {
  .pillars-container {
    grid-template-columns: repeat(2, 1fr);
  }

  .auth-buttons {
    flex-direction: row;
    gap: var(--spacing-sm);
  }
}

/* Hover support detection */
@media (hover: hover) {
  .pillar:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
  }

  .btn:hover::before {
    width: 300px;
    height: 300px;
  }
}

@media (hover: none) {
  .pillar:hover,
  .btn:hover::before {
    transform: none;
  }

  /* Focus styles for touch devices */
  .btn:focus,
  .form-control:focus,
  .nav-link:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
  }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --light-color: #1a1a1a;
    --dark-color: #e9ecef;
  }

  body {
    background-color: #121212;
    color: #e9ecef;
  }

  .calculator-form,
  .pillar,
  .elements-section,
  .card {
    background-color: #1e1e1e;
    border-color: #333;
  }

  .form-control {
    background-color: #2a2a2a;
    border-color: #444;
    color: #e9ecef;
  }

  .form-control:focus {
    border-color: var(--primary-color);
    background-color: #333;
  }
}

/* Print styles */
@media print {
  .app-header,
  .app-footer,
  .user-controls,
  .mobile-menu-toggle,
  .result-actions {
    display: none;
  }

  .main-content {
    padding: 0;
  }

  .pillars-container {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
  }

  body {
    background: white !important;
    color: black !important;
  }

  .pillar,
  .calculator-form {
    background: white !important;
    border: 1px solid #ccc !important;
  }
}

/* BaZi Specific Styles */
.pillars-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.pillar {
  background: white;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.pillar::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--wood-color),
    var(--fire-color),
    var(--earth-color),
    var(--metal-color),
    var(--water-color)
  );
}

.pillar:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.pillar h5 {
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.pillar-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.stem,
.branch {
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  font-weight: 600;
  font-size: var(--font-size-lg);
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.stem {
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  color: var(--dark-color);
}

.branch {
  background: linear-gradient(135deg, var(--primary-color), #8e24aa);
  color: white;
}

.pillar-meaning {
  font-size: var(--font-size-sm);
  color: var(--secondary-color);
  font-style: italic;
}

.elements-section {
  background: white;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin-top: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
}

.elements-section h4 {
  text-align: center;
  color: var(--primary-color);
  margin-bottom: var(--spacing-lg);
}

.elements-legend {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.legend-color {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid white;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.1);
}

.result-section {
  margin-top: var(--spacing-xxl);
}

.result-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.result-header h3 {
  color: var(--primary-color);
  font-size: var(--font-size-xxl);
  margin-bottom: var(--spacing-sm);
}

.result-description {
  color: var(--secondary-color);
  font-size: var(--font-size-lg);
}

.result-actions {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
  flex-wrap: wrap;
}

/* Responsive Design */
@media (max-width: 768px) {
  .pillars-container {
    grid-template-columns: 1fr;
  }

  .main-nav ul {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-sm);
  }

  .footer-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .modal {
    width: 95%;
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

  .result-actions {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .pillars-container {
    gap: var(--spacing-md);
  }

  .pillar {
    padding: var(--spacing-md);
  }

  .calculator-form {
    padding: var(--spacing-lg);
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }

  .elements-legend {
    flex-direction: column;
    align-items: center;
  }
}

/* ========================================
   ENHANCED NAVIGATION STYLES
   Modern mobile-first navigation with competitive advantages
   ======================================== */

/* Enhanced Navigation Container */
.enhanced-navigation {
  position: relative;
  z-index: 100;
}

/* Mobile Navigation Header */
.mobile-nav-header {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md);
  background: var(--primary-color);
  color: white;
  box-shadow: var(--shadow-md);
}

@media (max-width: 768px) {
  .mobile-nav-header {
    display: flex;
  }
}

/* Mobile Menu Toggle - Enhanced */
.mobile-menu-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: none;
  border: none;
  color: white;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px; /* Touch target compliance */
  min-width: 44px;
}

.mobile-menu-toggle:hover,
.mobile-menu-toggle:focus {
  background: rgba(255, 255, 255, 0.1);
  outline: 2px solid rgba(255, 255, 255, 0.3);
  outline-offset: 2px;
}

.mobile-menu-toggle.active {
  background: rgba(255, 255, 255, 0.15);
}

/* Hamburger Icon with Animation */
.hamburger-icon {
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 20px;
  height: 20px;
  justify-content: center;
}

.hamburger-line {
  width: 100%;
  height: 2px;
  background-color: white;
  transition: all var(--transition-normal);
  border-radius: 1px;
}

/* Hamburger Animation States */
.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: translateX(-10px);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

.menu-text {
  font-size: var(--font-size-sm);
  font-weight: 500;
  display: none;
}

@media (min-width: 350px) {
  .menu-text {
    display: block;
  }
}

/* Mobile Current Section Display */
.mobile-current-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 500;
}

.current-icon {
  font-size: 1.25rem;
}

.current-label {
  font-size: var(--font-size-base);
}

/* Navigation Menu */
.nav-menu {
  background: var(--primary-color);
  color: white;
  transition: all var(--transition-normal);
}

/* Desktop Navigation */
@media (min-width: 769px) {
  .nav-menu {
    background: transparent;
    padding: 0;
  }

  .mobile-nav-header {
    display: none;
  }

  .nav-list {
    display: flex;
    justify-content: center;
    background: var(--primary-color);
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-md);
  }
}

/* Mobile Navigation Styles */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 0;
    left: -100%;
    width: 280px;
    height: 100vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    z-index: 200;
    overflow-y: auto;
  }

  .nav-menu.active {
    left: 0;
  }

  .nav-list {
    padding: var(--spacing-xl) var(--spacing-lg);
    flex: 1;
  }
}

/* Navigation List */
.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: var(--spacing-md);
}

@media (max-width: 768px) {
  .nav-list {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
}

/* Navigation Items */
.nav-item {
  position: relative;
}

/* Navigation Links - Enhanced */
.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: white;
  text-decoration: none;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  position: relative;
  font-weight: 500;
  min-height: 48px; /* Touch compliance */
  cursor: pointer;
}

@media (max-width: 768px) {
  .nav-link {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: var(--spacing-sm);
  }
}

/* Navigation Link States */
.nav-link:hover,
.nav-link:focus {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-1px);
  outline: none;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.nav-link:focus {
  outline: 2px solid rgba(255, 255, 255, 0.5);
  outline-offset: 2px;
}

.nav-link.active {
  background: rgba(255, 255, 255, 0.15);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

@media (max-width: 768px) {
  .nav-link:hover,
  .nav-link:focus {
    background: rgba(255, 255, 255, 0.1);
    transform: none;
  }

  .nav-link.active {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
  }
}

/* Navigation Icons */
.nav-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .nav-icon {
    font-size: 1.5rem;
  }
}

/* Navigation Labels */
.nav-label {
  font-size: var(--font-size-base);
  font-weight: 600;
}

@media (max-width: 768px) {
  .nav-label {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
  }
}

/* Navigation Descriptions */
.nav-description {
  font-size: var(--font-size-sm);
  opacity: 0.9;
  display: none;
}

@media (max-width: 768px) {
  .nav-description {
    display: block;
    opacity: 0.8;
    line-height: 1.4;
  }
}

/* Premium Badge */
.premium-badge {
  background: #ffd700;
  color: var(--primary-color);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 12px;
  margin-left: auto;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

@media (max-width: 768px) {
  .premium-badge {
    align-self: flex-end;
    margin-top: var(--spacing-xs);
    margin-left: 0;
  }
}

/* Premium Link Styling */
.premium-link {
  background: linear-gradient(135deg, var(--primary-color), #7c3aed);
  border: 1px solid rgba(255, 215, 0, 0.3);
}

.premium-link:hover,
.premium-link:focus {
  background: linear-gradient(135deg, #7c3aed, var(--primary-color));
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(255, 215, 0, 0.2);
}

/* Active Indicator */
.active-indicator {
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: white;
  border-radius: 2px;
}

@media (max-width: 768px) {
  .active-indicator {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    bottom: auto;
    left: auto;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #ffd700;
  }
}

/* Navigation Footer (Mobile Only) */
.nav-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(0, 0, 0, 0.1);
  display: none;
}

@media (max-width: 768px) {
  .nav-footer {
    display: block;
  }
}

.nav-footer-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
}

.brand-icon {
  font-size: 1.5rem;
}

.nav-footer-description {
  font-size: var(--font-size-sm);
  opacity: 0.8;
  line-height: 1.4;
  margin: 0;
}

/* Mobile Overlay */
.mobile-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.5);
  z-index: 150;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  backdrop-filter: blur(2px);
}

.mobile-nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* Navigation Tooltip (Desktop) */
.nav-tooltip {
  position: fixed;
  background: rgba(0, 0, 0, 0.9);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  pointer-events: none;
  max-width: 200px;
  text-align: center;
  transform: translateX(-50%);
}

.nav-tooltip.visible {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(-5px);
}

.nav-tooltip::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 50%;
  transform: translateX(-50%);
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-bottom: 5px solid rgba(0, 0, 0, 0.9);
}

/* Body Scroll Lock */
body.nav-open {
  overflow: hidden;
  position: fixed;
  width: 100%;
}

/* Section Transitions */
.content-section {
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-normal);
}

.content-section.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.content-section.section-enter {
  animation: sectionEnter var(--transition-normal) ease-out;
}

@keyframes sectionEnter {
  from {
    opacity: 0;
    transform: translateY(30px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
  .nav-link,
  .mobile-nav-overlay,
  .nav-menu,
  .hamburger-line,
  .content-section {
    transition: none;
  }

  .content-section.section-enter {
    animation: none;
  }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  .nav-link {
    border: 2px solid white;
  }

  .nav-link:focus {
    outline: 3px solid yellow;
    outline-offset: 2px;
  }

  .nav-link.active {
    background: white;
    color: var(--primary-color);
  }
}

/* Container Width Compliance */
.header-container,
.main-content {
  max-width: var(--container-width);
  margin: 0 auto;
}

/* ========================================
   END ENHANCED NAVIGATION STYLES  
   ======================================== */

/* ========================================
   COMPREHENSIVE BUTTON SYSTEM
   Modern button components with accessibility
   ======================================== */

/* Base Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid transparent;
  border-radius: var(--border-radius);
  font-family: inherit;
  font-size: var(--font-size-base);
  font-weight: 500;
  line-height: 1.4;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  background-color: transparent;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
  min-height: 44px; /* Touch target compliance */
}

.btn:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* Button Variants */
.btn-primary {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
}

.btn-primary:hover,
.btn-primary:focus {
  background-color: #461c96;
  border-color: #461c96;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(83, 29, 171, 0.3);
}

.btn-secondary {
  background-color: var(--secondary-color);
  border-color: var(--secondary-color);
  color: white;
}

.btn-secondary:hover,
.btn-secondary:focus {
  background-color: #5a6268;
  border-color: #5a6268;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(108, 117, 125, 0.3);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.btn-outline:hover,
.btn-outline:focus {
  background-color: var(--primary-color);
  color: white;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(83, 29, 171, 0.2);
}

.btn-ghost {
  background-color: transparent;
  border-color: transparent;
  color: var(--primary-color);
}

.btn-ghost:hover,
.btn-ghost:focus {
  background-color: rgba(83, 29, 171, 0.1);
  color: #461c96;
}

.btn-link {
  background-color: transparent;
  border-color: transparent;
  color: var(--primary-color);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.btn-link:hover,
.btn-link:focus {
  color: #461c96;
  text-decoration-thickness: 2px;
}

.btn-premium {
  background: linear-gradient(135deg, var(--primary-color), #7c3aed);
  border: 1px solid rgba(255, 215, 0, 0.3);
  color: white;
  position: relative;
  overflow: hidden;
}

.btn-premium::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent, rgba(255, 215, 0, 0.1), transparent);
  transition: transform var(--transition-slow);
  transform: translateX(-100%) translateY(-100%) rotate(45deg);
}

.btn-premium:hover::before {
  transform: translateX(100%) translateY(100%) rotate(45deg);
}

.btn-premium:hover,
.btn-premium:focus {
  background: linear-gradient(135deg, #7c3aed, var(--primary-color));
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 215, 0, 0.3);
}

/* Button Sizes */
.btn-xs {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
  min-height: 32px;
}

.btn-sm {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  min-height: 36px;
}

.btn-md {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  min-height: 44px;
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-lg);
  min-height: 52px;
}

.btn-xl {
  padding: var(--spacing-lg) var(--spacing-xl);
  font-size: var(--font-size-xl);
  min-height: 60px;
}

/* Button Content */
.btn-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  pointer-events: none;
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1em;
  line-height: 1;
}

.btn-text {
  line-height: 1.4;
}

/* Loading Spinner */
.btn-spinner {
  display: flex;
  align-items: center;
  justify-content: center;
}

.spinner {
  width: 1.2em;
  height: 1.2em;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* Mobile optimizations */
@media (max-width: 768px) {
  .btn {
    min-height: 48px;
    padding: var(--spacing-md) var(--spacing-lg);
  }

  .btn-sm {
    min-height: 44px;
    padding: var(--spacing-sm) var(--spacing-md);
  }
}

/* Touch device optimizations */
@media (pointer: coarse) {
  .btn {
    min-height: 48px;
    min-width: 48px;
    padding: var(--spacing-md);
  }

  .btn-sm {
    min-height: 44px;
    min-width: 44px;
  }
}

/* ========================================
   END COMPREHENSIVE BUTTON SYSTEM
   ======================================== */

/* ========================================
   MODAL COMPONENT SYSTEM
   Accessible modal dialogs with animations
   ======================================== */

/* Modal Container */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1050;
  outline: none;
}

.modal.show {
  display: flex;
}

/* Modal Animation */
.modal-fade {
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.modal-fade.modal-shown {
  opacity: 1;
}

.modal-fade .modal-dialog {
  transform: translateY(-50px);
  transition: transform var(--transition-normal);
}

.modal-fade.modal-shown .modal-dialog {
  transform: translateY(0);
}

/* Modal Dialog */
.modal-dialog {
  position: relative;
  margin: var(--spacing-lg);
  max-width: 500px;
  width: 100%;
  max-height: calc(100vh - 2rem);
  display: flex;
  flex-direction: column;
}

/* Modal Sizes */
.modal-dialog.modal-sm {
  max-width: 300px;
}

.modal-dialog.modal-lg {
  max-width: 800px;
}

.modal-dialog.modal-xl {
  max-width: 1140px;
}

.modal-dialog.modal-full {
  max-width: none;
  width: calc(100% - 2rem);
  height: calc(100% - 2rem);
  margin: 1rem;
}

/* Modal Centered */
.modal-centered .modal-dialog {
  align-items: center;
  min-height: calc(100% - 2rem);
}

/* Modal Scrollable */
.modal-scrollable .modal-dialog {
  max-height: calc(100vh - 2rem);
}

.modal-scrollable .modal-content {
  max-height: calc(100vh - 2rem);
  overflow: hidden;
}

.modal-scrollable .modal-body {
  overflow-y: auto;
}

/* Modal Content */
.modal-content {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  background-color: white;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  outline: none;
  overflow: hidden;
}

body.dark-theme .modal-content {
  background-color: #2d3748;
  color: white;
}

/* Modal Header */
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  border-bottom: 1px solid #e9ecef;
  border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
}

body.dark-theme .modal-header {
  border-bottom-color: #4a5568;
}

.modal-title {
  margin: 0;
  font-size: var(--font-size-xl);
  font-weight: 600;
  line-height: 1.4;
  color: inherit;
}

.modal-close {
  padding: var(--spacing-sm);
  margin: calc(-1 * var(--spacing-sm));
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--secondary-color);
  cursor: pointer;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover,
.modal-close:focus {
  color: var(--dark-color);
  background-color: rgba(0, 0, 0, 0.05);
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

body.dark-theme .modal-close {
  color: #a0aec0;
}

body.dark-theme .modal-close:hover,
body.dark-theme .modal-close:focus {
  color: white;
  background-color: rgba(255, 255, 255, 0.1);
}

/* Modal Body */
.modal-body {
  position: relative;
  flex: 1 1 auto;
  padding: var(--spacing-lg);
  overflow-y: auto;
}

.modal-body p:last-child {
  margin-bottom: 0;
}

/* Modal Footer */
.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg);
  border-top: 1px solid #e9ecef;
  border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
}

body.dark-theme .modal-footer {
  border-top-color: #4a5568;
}

/* Modal Backdrop */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
  z-index: -1;
}

/* Body Classes */
body.modal-open {
  overflow: hidden;
  padding-right: 0; /* Prevent scrollbar jump */
}

/* Mobile Responsive */
@media (max-width: 576px) {
  .modal-dialog {
    margin: var(--spacing-sm);
    max-width: none;
    width: calc(100% - 1rem);
  }

  .modal-dialog.modal-full {
    margin: 0;
    width: 100%;
    height: 100%;
    border-radius: 0;
  }

  .modal-content {
    border-radius: var(--border-radius);
  }

  .modal-dialog.modal-full .modal-content {
    border-radius: 0;
    height: 100%;
  }

  .modal-header,
  .modal-body,
  .modal-footer {
    padding: var(--spacing-md);
  }

  .modal-footer {
    flex-direction: column-reverse;
  }

  .modal-footer .btn {
    width: 100%;
  }
}

/* Form Elements in Modals */
.modal .form-group {
  margin-bottom: var(--spacing-md);
}

.modal .form-group:last-child {
  margin-bottom: 0;
}

.modal .form-control {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid #ced4da;
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.modal .form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(83, 29, 171, 0.2);
}

body.dark-theme .modal .form-control {
  background-color: #4a5568;
  border-color: #718096;
  color: white;
}

body.dark-theme .modal .form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(83, 29, 171, 0.3);
}

/* Modal Animations for Different Types */
.modal-alert .modal-dialog {
  animation: modalBounceIn var(--transition-normal) ease-out;
}

.modal-confirm .modal-dialog {
  animation: modalSlideDown var(--transition-normal) ease-out;
}

.modal-prompt .modal-dialog {
  animation: modalZoomIn var(--transition-normal) ease-out;
}

@keyframes modalBounceIn {
  0% {
    transform: scale(0.3);
    opacity: 0;
  }
  50% {
    transform: scale(1.05);
  }
  70% {
    transform: scale(0.9);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes modalSlideDown {
  0% {
    transform: translateY(-100%);
    opacity: 0;
  }
  100% {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes modalZoomIn {
  0% {
    transform: scale(0.8);
    opacity: 0;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
  .modal-fade,
  .modal-fade .modal-dialog,
  .modal-dialog {
    transition: none;
    animation: none;
  }
}

@media (prefers-contrast: high) {
  .modal-content {
    border: 2px solid currentColor;
  }

  .modal-header,
  .modal-footer {
    border-width: 2px;
  }

  .modal-close:focus {
    outline: 3px solid currentColor;
    outline-offset: 2px;
  }
}

/* Print Styles */
@media print {
  .modal {
    display: none !important;
  }
}

/* Z-Index Management */
.modal + .modal {
  z-index: 1051;
}

.modal + .modal + .modal {
  z-index: 1052;
}

/* Specific Modal Types */
.auth-modal .modal-body {
  padding: var(--spacing-xl);
}

.premium-modal .modal-content {
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  border: 1px solid rgba(255, 215, 0, 0.2);
}

.premium-modal .modal-header {
  background: linear-gradient(135deg, var(--primary-color), #7c3aed);
  color: white;
  border-bottom: none;
}

body.dark-theme .premium-modal .modal-content {
  background: linear-gradient(135deg, #2d3748, #4a5568);
}

/* ========================================
   END MODAL COMPONENT SYSTEM
   ======================================== */