/* ==========================================================================
   Tripitaka 100 Verses - Master Stylesheet
   Serene Buddhist Design: Saffron, Sandalwood, Parchment & Gold
   Core Web Vitals Optimized: Zero CLS, Responsive, A11y & AdSense Compliant
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@500;600;700;800&family=Noto+Serif:ital,wght@0,400;0,600;0,700;1,400;1,600&family=Plus+Jakarta+Sans:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;700&family=Noto+Sans+JP:wght@400;500;700&family=Noto+Sans+Thai:wght@400;500;700&family=Noto+Sans+Devanagari:wght@400;500;700&display=swap');

:root {
  --color-primary: #d97706; /* Saffron Amber */
  --color-primary-dark: #b45309;
  --color-primary-light: #fbbf24;
  --color-gold: #f59e0b;
  --color-lotus: #be185d;
  
  /* Light Theme (Warm Buddhist Parchment) */
  --bg-main: #fcfbf7;
  --bg-card: #ffffff;
  --bg-surface: #f7f4ed;
  --bg-muted: #f0ebe0;
  --border-main: #e8e1d5;
  --border-focus: #d97706;
  --text-main: #292524;
  --text-muted: #78716c;
  --text-accent: #b45309;
  --shadow-card: 0 4px 20px -2px rgba(120, 113, 108, 0.08), 0 2px 6px -1px rgba(120, 113, 108, 0.04);
  --shadow-hover: 0 12px 30px -4px rgba(217, 119, 6, 0.15), 0 4px 12px -2px rgba(120, 113, 108, 0.06);
}

.dark {
  /* Dark Theme (Sacred Sandalwood / Night Monastery) */
  --bg-main: #141210;
  --bg-card: #1c1917;
  --bg-surface: #262220;
  --bg-muted: #2f2a28;
  --border-main: #38322e;
  --border-focus: #f59e0b;
  --text-main: #f5f5f4;
  --text-muted: #a8a29e;
  --text-accent: #fbbf24;
  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.4), 0 2px 6px -1px rgba(0, 0, 0, 0.2);
  --shadow-hover: 0 12px 30px -4px rgba(245, 158, 11, 0.18), 0 4px 12px -2px rgba(0, 0, 0, 0.3);
}

/* Base resets & typography */
html {
  scroll-behavior: smooth;
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Multilingual font fallback support */
:lang(zh) { font-family: 'Noto Sans SC', 'Plus Jakarta Sans', sans-serif; }
:lang(ja) { font-family: 'Noto Sans JP', 'Plus Jakarta Sans', sans-serif; }
:lang(th) { font-family: 'Noto Sans Thai', 'Plus Jakarta Sans', sans-serif; }
:lang(hi) { font-family: 'Noto Sans Devanagari', 'Plus Jakarta Sans', sans-serif; }

h1, h2, h3, .font-serif {
  font-family: 'Cinzel', 'Noto Serif', serif;
}

.font-body-serif {
  font-family: 'Noto Serif', serif;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-surface);
}
::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-dark);
}

/* Header & Navigation blur effects */
.nav-backdrop {
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background-color: rgba(252, 251, 247, 0.88);
  border-bottom: 1px solid var(--border-main);
}
.dark .nav-backdrop {
  background-color: rgba(20, 18, 16, 0.88);
}

/* Dharmachakra background watermark */
.dharma-bg-watermark {
  background-image: radial-gradient(circle at 50% 20%, rgba(217, 119, 6, 0.05) 0%, transparent 60%);
}
.dark .dharma-bg-watermark {
  background-image: radial-gradient(circle at 50% 20%, rgba(245, 158, 11, 0.07) 0%, transparent 60%);
}

/* Verse Card Styling */
.verse-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-main);
  box-shadow: var(--shadow-card);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.verse-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-primary);
}

/* AdSense Polite Containers: Prevents Cumulative Layout Shift (CLS) */
.ad-slot-wrapper {
  background-color: var(--bg-surface);
  border: 1px dashed var(--border-main);
  border-radius: 1rem;
  padding: 1rem;
  margin: 1.5rem auto;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: all 0.2s ease;
}
.ad-label {
  display: block;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.ad-leaderboard {
  min-height: 100px;
  max-width: 970px;
}
.ad-responsive {
  min-height: 260px;
  width: 100%;
}
.ad-inline {
  min-height: 250px;
}

/* Modal Smooth Transitions */
#verseModal:not(.hidden) {
  animation: modalFadeIn 0.25s ease-out forwards;
}
@keyframes modalFadeIn {
  from { opacity: 0; transform: scale(0.98); }
  to { opacity: 1; transform: scale(1); }
}

/* Ripple effect on sound bell click */
.bell-active-ring {
  animation: bellPulse 1.2s ease-out;
}
@keyframes bellPulse {
  0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.7); }
  70% { transform: scale(1.05); box-shadow: 0 0 0 16px rgba(245, 158, 11, 0); }
  100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(245, 158, 11, 0); }
}

/* Floating Action Button (Back to Top) */
.btn-back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 40;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(217, 119, 6, 0.4);
  cursor: pointer;
  transition: all 0.3s ease;
  opacity: 0;
  visibility: hidden;
  border: none;
}
.btn-back-to-top.show {
  opacity: 1;
  visibility: visible;
}
.btn-back-to-top:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-3px);
}

/* Accessibility: High contrast focus outline */
button:focus-visible, a:focus-visible, select:focus-visible, input:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Print Friendly Styles */
@media print {
  .nav-backdrop, footer, .ad-slot-wrapper, #categoryChips, #searchInput, .btn-back-to-top, #bellBtn, #themeToggle, #langSelect {
    display: none !important;
  }
  body, html {
    background: #ffffff !important;
    color: #000000 !important;
  }
  .verse-card {
    border: 1px solid #ccc !important;
    page-break-inside: avoid;
    box-shadow: none !important;
  }
}