/* TibetanDate - Design System & Styles */

:root {
  /* Brand Tokens */
  --color-maroon-primary: #8B1E3F;
  --color-maroon-hover: #721632;
  --color-maroon-light: #FEE2E2;
  
  --color-saffron-primary: #D97706;
  --color-saffron-hover: #B45309;
  --color-saffron-light: #FEF3C7;
  --color-gold: #F59E0B;
  --color-gold-glow: rgba(245, 158, 11, 0.25);
  
  --color-bg-light: #FDFBF7;
  --color-surface-light: #FFFFFF;
  --color-border-light: #E5E7EB;
  --color-text-main: #1F2937;
  --color-text-muted: #6B7280;

  /* Dark Mode Tokens */
  --bg-dark: #0F172A;
  --surface-dark: #1E293B;
  --border-dark: #334155;
  --text-dark-main: #F8FAFC;
  --text-dark-muted: #94A3B8;

  /* Dynamic Variables */
  --bg-body: var(--color-bg-light);
  --bg-card: var(--color-surface-light);
  --bg-card-header: #FFF8EE;
  --border-color: var(--color-border-light);
  --text-primary: var(--color-text-main);
  --text-secondary: var(--color-text-muted);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 14px rgba(139, 30, 63, 0.08);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-heading: 'Outfit', var(--font-sans);
  --container-max: 1200px;
}

[data-theme="dark"] {
  --bg-body: var(--bg-dark);
  --bg-card: var(--surface-dark);
  --bg-card-header: #192334;
  --border-color: var(--border-dark);
  --text-primary: var(--text-dark-main);
  --text-secondary: var(--text-dark-muted);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.6);
}

/* Accessibility: Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--color-maroon-primary);
  color: #FFFFFF;
  padding: 0.75rem 1.25rem;
  z-index: 9999;
  border-radius: var(--radius-sm);
  font-weight: 700;
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
  outline: 3px solid var(--color-gold);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  scroll-behavior: smooth;
  font-display: swap;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
}

a {
  color: var(--color-maroon-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-saffron-primary);
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(253, 251, 247, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

[data-theme="dark"] .site-header {
  background-color: rgba(15, 23, 42, 0.94);
}

.header-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.35rem;
  font-weight: 800;
  font-family: var(--font-heading);
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.brand-logo svg {
  width: 30px;
  height: 30px;
  color: var(--color-maroon-primary);
}

[data-theme="dark"] .brand-logo svg {
  color: var(--color-gold);
}

.brand-badge {
  font-size: 0.65rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-maroon-primary), var(--color-saffron-primary));
  color: #FFF;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
}

.nav-link {
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-maroon-primary);
  background-color: rgba(139, 30, 63, 0.08);
}

[data-theme="dark"] .nav-link:hover, 
[data-theme="dark"] .nav-link.active {
  color: var(--color-gold);
  background-color: rgba(245, 158, 11, 0.12);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-toggle-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.theme-toggle-btn:hover {
  border-color: var(--color-saffron-primary);
  color: var(--color-saffron-primary);
}

/* Breadcrumb Navigation */
.breadcrumb-nav {
  margin: 1.5rem 0 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb-nav a {
  color: var(--text-secondary);
}

.breadcrumb-nav a:hover {
  color: var(--color-maroon-primary);
}

.breadcrumb-separator {
  color: var(--border-color);
}

/* AI Disclosure Banner */
.ai-disclosure-banner {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.25rem;
  margin-bottom: 2rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.875rem;
  line-height: 1.5;
}

.ai-disclosure-banner strong {
  color: var(--color-maroon-primary);
}

[data-theme="dark"] .ai-disclosure-banner strong {
  color: var(--color-gold);
}

/* Hero Section */
.hero-section {
  padding: 2.5rem 0 1.5rem;
  text-align: center;
  background: radial-gradient(circle at 50% 20%, rgba(217, 119, 6, 0.08) 0%, transparent 70%);
}

.hero-title {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, var(--color-maroon-primary) 30%, var(--color-saffron-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="dark"] .hero-title {
  background: linear-gradient(135deg, #F8FAFC 30%, var(--color-gold) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 1.5rem;
}

/* Quick Banner for Today */
.today-banner {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-card-header);
  border: 1px solid rgba(245, 158, 11, 0.3);
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.today-banner strong {
  color: var(--color-maroon-primary);
}

[data-theme="dark"] .today-banner strong {
  color: var(--color-gold);
}

/* Main Tool Grid */
.converter-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

@media (max-width: 900px) {
  .converter-grid {
    grid-template-columns: 1fr;
  }
}

/* Card System */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card-header {
  padding: 1.25rem 1.5rem;
  background-color: var(--bg-card-header);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-title {
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-body {
  padding: 1.5rem;
}

/* Form Controls */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.form-input, .form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  background-color: var(--bg-body);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-input:focus, .form-select:focus {
  border-color: var(--color-saffron-primary);
  box-shadow: 0 0 0 3px var(--color-gold-glow);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-maroon-primary), var(--color-maroon-hover));
  color: #FFFFFF;
  box-shadow: 0 4px 12px rgba(139, 30, 63, 0.25);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-maroon-hover), #721632);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--color-saffron-primary);
  color: #FFFFFF;
}

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

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--color-maroon-primary);
  color: var(--color-maroon-primary);
}

.btn-block {
  width: 100%;
}

/* Mode Switcher Tabs */
.tabs-container {
  display: flex;
  gap: 0.5rem;
  background: var(--bg-body);
  padding: 0.35rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
}

.tab-btn {
  flex: 1;
  padding: 0.6rem;
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn.active {
  background: var(--bg-card);
  color: var(--color-maroon-primary);
  box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .tab-btn.active {
  color: var(--color-gold);
}

/* Tibetan Date Result Card Display */
.result-card {
  background: linear-gradient(145deg, var(--bg-card), var(--bg-card-header));
  border: 2px solid var(--color-saffron-primary);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  position: relative;
  overflow: hidden;
}

.result-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 6px;
  height: 100%;
  background: linear-gradient(180deg, var(--color-maroon-primary), var(--color-saffron-primary));
}

.result-badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.result-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

.badge-rabjung {
  background: #E0E7FF;
  color: #3730A3;
}

.badge-zodiac {
  background: #FEF3C7;
  color: #92400E;
}

.badge-auspicious {
  background: #DCFCE7;
  color: #166534;
}

.badge-skipped {
  background: #FEE2E2;
  color: #991B1B;
}

.badge-doubled {
  background: #F3E8FF;
  color: #6B21A8;
}

.result-main-date {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-maroon-primary);
  margin-bottom: 0.25rem;
}

[data-theme="dark"] .result-main-date {
  color: var(--color-gold);
}

.result-sub-date {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.result-detail-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.result-detail-item {
  background: rgba(0, 0, 0, 0.03);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
}

[data-theme="dark"] .result-detail-item {
  background: rgba(255, 255, 255, 0.04);
}

.result-detail-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-secondary);
  font-weight: 600;
}

.result-detail-val {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.result-explanation {
  background: var(--bg-body);
  border-left: 3px solid var(--color-saffron-primary);
  padding: 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
}

.result-actions {
  display: flex;
  gap: 0.75rem;
}

/* AI Assistant Section */
.ai-box {
  background: var(--bg-card);
  border: 1px solid var(--color-saffron-primary);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 3rem;
}

.ai-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.ai-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--color-maroon-primary), var(--color-saffron-primary));
  color: #FFF;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.ai-prompt-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.ai-pill {
  font-size: 0.85rem;
  background: var(--bg-body);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.2s ease;
}

.ai-pill:hover {
  border-color: var(--color-saffron-primary);
  color: var(--color-maroon-primary);
}

[data-theme="dark"] .ai-pill:hover {
  color: var(--color-gold);
}

.ai-input-wrapper {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.ai-response-area {
  margin-top: 1rem;
  padding: 1.25rem;
  background: var(--bg-body);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  font-size: 0.95rem;
  line-height: 1.6;
  display: none;
}

.ai-response-area.active {
  display: block;
}

.ai-loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(217, 119, 6, 0.3);
  border-radius: 50%;
  border-top-color: var(--color-saffron-primary);
  animation: spin 0.8s ease-in-out infinite;
}

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

/* Articles & Content Grid */
.articles-section {
  margin-bottom: 4rem;
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 2rem;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.75rem;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.article-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-saffron-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.5rem;
}

.article-title {
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-color);
  padding-top: 0.75rem;
}

/* Single Article Full View */
.article-full-view {
  max-width: 800px;
  margin: 0 auto 4rem;
  background: var(--bg-card);
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
}

.article-full-view h1 {
  font-size: 2.25rem;
  margin-bottom: 1rem;
}

.article-full-view h2 {
  font-size: 1.5rem;
  margin: 2rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.article-full-view h3 {
  font-size: 1.2rem;
  margin: 1.5rem 0 0.75rem;
}

.article-full-view p {
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
  line-height: 1.7;
}

.article-full-view ul, .article-full-view ol {
  margin: 1rem 0 1.5rem 1.5rem;
}

.article-full-view li {
  margin-bottom: 0.5rem;
}

.article-full-view table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

.article-full-view th, .article-full-view td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  text-align: left;
}

.article-full-view th {
  background: var(--bg-card-header);
  font-weight: 700;
}

/* Data Tables */
.table-responsive {
  overflow-x: auto;
  margin: 1.5rem 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.data-table th, .data-table td {
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.data-table th {
  background-color: var(--bg-card-header);
  font-weight: 700;
  color: var(--text-primary);
}

.data-table tr:hover {
  background-color: rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .data-table tr:hover {
  background-color: rgba(255, 255, 255, 0.03);
}

/* Footer */
.site-footer {
  margin-top: auto;
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 3rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 2.5rem;
}

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

.footer-col h4 {
  font-size: 1rem;
  margin-bottom: 1rem;
  color: var(--color-saffron-primary);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--color-maroon-primary);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Utilities */
.hidden { display: none !important; }
.badge { display: inline-block; padding: 0.2rem 0.5rem; border-radius: var(--radius-sm); font-size: 0.75rem; font-weight: 600; }