/* ==========================================
   DEAN – Dharmavaram Educational Academy
   Design System, Theme Styles & Layout
   ========================================== */

/* 1. Global Reset & Variables */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root,
[data-theme="light"] {
  color-scheme: light;
  --bg-main: #ffffff;
  --bg-surface: #f8fafc;
  --bg-card: #ffffff;
  --bg-subtle: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --border-strong: #cbd5e1;
  --primary: #1e3a8a;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --accent: #b45309;
  --accent-light: #fffbeb;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --toggle-bg: #f1f5f9;
  --toggle-hover: #e2e8f0;
  --toggle-border: #cbd5e1;
  --logo-badge-bg: transparent;
  --logo-badge-padding: 0;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg-main: #0b0f17;
  --bg-surface: #151d2a;
  --bg-card: #1e293b;
  --bg-subtle: #2d3748;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --border-strong: #475569;
  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --primary-light: rgba(59, 130, 246, 0.12);
  --accent: #f59e0b;
  --accent-light: rgba(245, 158, 11, 0.12);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --toggle-bg: #1e293b;
  --toggle-hover: #334155;
  --toggle-border: #475569;
  --logo-badge-bg: transparent;
  --logo-badge-padding: 0;
}

/* 2. Base Typography & Structure */
body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.25s ease, color 0.25s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* 3-Second Splash Screen */
.splash-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: var(--bg-main, #ffffff);
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  opacity: 1;
  visibility: visible;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.splash-screen.fade-out {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.splash-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.splash-logo {
  max-width: 260px;
  width: 75vw;
  height: auto;
  object-fit: contain;
  animation: splashPulse 2s ease-in-out infinite;
}

@keyframes splashPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.04); }
}

/* Sidebar Overlay Backdrop (Crisp, Translucent, No Blur) */
.sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 9998;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.sidebar-overlay.open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* 3. Header & Navigation */
.site-header {
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
}

.brand-section:hover {
  text-decoration: none;
}

.logo-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--logo-badge-bg);
  padding: var(--logo-badge-padding);
  border-radius: 8px;
  transition: background-color 0.25s ease, padding 0.25s ease;
}

.dean-logo {
  height: 52px;
  width: auto;
  object-fit: contain;
  display: block;
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  line-height: 1.25;
}

.brand-subtitle {
  font-size: 0.825rem;
  color: var(--text-muted);
  font-weight: 500;
}

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

.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--toggle-bg);
  border: 1px solid var(--toggle-border);
  color: var(--text-primary);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  font-size: 1.15rem;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
  user-select: none;
  flex-shrink: 0;
}

.theme-toggle-btn .theme-text {
  display: none; /* Icon-only presentation */
}

.theme-toggle-btn:hover {
  background-color: var(--toggle-hover);
  transform: scale(1.06);
}

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

.theme-icon {
  font-size: 1.15rem;
  line-height: 1;
}

/* 4. Main Content Area */
.main-content {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.hero-banner {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2.5rem 2rem;
  margin-bottom: 2.5rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.hero-title {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 750px;
  margin: 0 auto 1.5rem auto;
}

.badge-location {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.35rem 0.85rem;
  border-radius: 50px;
  border: 1px solid var(--border-color);
}

/* Feature Cards Grid */
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border-color);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

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

.card-icon {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
}

.card-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.card-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Info Box / Announcement */
.announcement-box {
  background-color: var(--bg-surface);
  border-left: 4px solid var(--primary);
  border-top: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  border-radius: 0 8px 8px 0;
  padding: 1.25rem 1.5rem;
  margin-bottom: 2.5rem;
}

.announcement-title {
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.announcement-text {
  font-size: 0.925rem;
  color: var(--text-secondary);
}

/* Tables & Lists for Awards and Rules */
.awards-table-wrapper {
  overflow-x: auto;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background-color: var(--bg-card);
  box-shadow: var(--shadow-sm);
}

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

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

.awards-table th {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.awards-table tr:last-child td {
  border-bottom: none;
}

.awards-table tr:hover td {
  background-color: var(--primary-light);
}

.amount-column {
  text-align: right;
  font-weight: 700;
  color: var(--primary);
  font-size: 1.05rem;
}

.memento-box {
  background-color: var(--primary-light);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-primary);
  font-weight: 600;
}

.rules-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.rules-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary);
  border-radius: 0 8px 8px 0;
  padding: 1.1rem 1.35rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
}

.rule-number {
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 800;
  font-size: 0.9rem;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.rule-text {
  color: var(--text-secondary);
  font-size: 0.975rem;
  line-height: 1.6;
}

.inspiration-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2.25rem 2rem;
  max-width: 800px;
  margin: 0 auto 2.5rem auto;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.inspiration-portrait-wrapper {
  margin: 0 auto 1.5rem auto;
  display: inline-block;
}

.inspiration-portrait-img {
  width: 170px;
  height: 170px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--primary);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
  display: block;
  transition: transform 0.3s ease;
}

.inspiration-portrait-img:hover {
  transform: scale(1.03);
}

.inspiration-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.inspiration-subtitle {
  font-size: 0.95rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.inspiration-text {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.65;
  text-align: left;
}

/* 5. Footer */
.site-footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 2rem 1.5rem;
  margin-top: auto;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

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

/* 6. Responsive Breakpoints */
@media (max-width: 991px) {
  .header-container {
    padding: 0.6rem 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .brand-section {
    order: 1;
    margin-right: auto;
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  /* Requirement: Prominent 84px high logo on mobile */
  .dean-logo {
    height: 84px !important;
    width: auto;
    object-fit: contain;
  }

  .brand-title {
    font-size: 1.25rem;
    font-weight: 800;
  }

  .brand-subtitle {
    display: none; /* Clean mobile header */
  }

  .header-actions {
    order: 2;
    display: flex;
    align-items: center;
    gap: 0.65rem;
  }

  .theme-toggle-btn {
    order: 1;
  }

  .mobile-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    order: 2;
    font-size: 1.6rem;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.25rem 0.4rem;
  }

  /* Left Sliding Navigation Drawer (Pure White Background, Above Overlay) */
  .nav-menu-drawer {
    position: fixed;
    top: 0;
    left: 0;
    width: 310px;
    max-width: 85vw;
    height: 100vh;
    background-color: var(--bg-main);
    border-right: 1px solid var(--border-color);
    z-index: 10000;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    box-shadow: 6px 0 30px rgba(0, 0, 0, 0.25);
    overflow-y: auto;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
  }

  .nav-menu-drawer.open {
    transform: translateX(0);
  }

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

  .sidebar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  .sidebar-brand .dean-logo {
    height: 44px !important;
  }

  .sidebar-brand .brand-subtitle {
    display: block;
    font-size: 0.75rem;
  }

  .sidebar-close-btn {
    background: none;
    border: none;
    font-size: 1.4rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.3rem 0.5rem;
    border-radius: 6px;
    transition: color 0.2s ease, background-color 0.2s ease;
  }

  .sidebar-close-btn:hover {
    color: var(--text-primary);
    background-color: var(--bg-subtle);
  }

  .nav-list {
    list-style: none;
    padding: 0.75rem 0;
    display: flex;
    flex-direction: column;
  }

  .nav-link {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.85rem 1.5rem;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.975rem;
    border-radius: 0;
    border-left: 4px solid transparent;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  }

  .nav-link:hover,
  .nav-link.active {
    background-color: var(--primary-light);
    color: var(--primary);
    font-weight: 700;
    border-left-color: var(--primary);
    text-decoration: none;
  }

  .nav-icon {
    font-size: 1.15rem;
    width: 24px;
    text-align: center;
  }

  .nav-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 0.5rem 1.5rem;
  }

  .pwa-menu-item {
    display: none; /* Shown dynamically via JS when install prompt triggers */
  }

  .pwa-install-link {
    color: var(--primary);
    font-weight: 700;
  }

  .refresh-link {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.2s ease, background-color 0.2s ease;
  }

  .refresh-link:hover {
    color: var(--primary);
    background-color: var(--primary-light);
    text-decoration: none;
  }

  #refresh-icon.spinning {
    display: inline-block;
    animation: spinIcon 0.8s linear infinite;
  }

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

  .hero-banner {
    padding: 1.75rem 1.25rem;
  }

  .hero-title {
    font-size: 1.6rem;
  }

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

  .footer-container {
    flex-direction: column;
    text-align: center;
  }
}

/* Desktop Navigation (>= 992px) */
@media (min-width: 992px) {
  .mobile-menu-btn {
    display: none;
  }

  .sidebar-header {
    display: none;
  }

  .sidebar-overlay {
    display: none;
  }

  .nav-menu-drawer {
    display: block;
    position: static;
    transform: none;
    width: auto;
    height: auto;
    background: transparent;
    border: none;
    box-shadow: none;
  }

  .nav-list {
    display: flex;
    align-items: center;
    gap: 1rem;
    list-style: none;
  }

  .nav-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.45rem 0.65rem;
    border-radius: 6px;
    transition: color 0.2s ease, background-color 0.2s ease;
  }

  .nav-link:hover,
  .nav-link.active {
    color: var(--primary);
    background-color: var(--primary-light);
    text-decoration: none;
  }

  .nav-divider {
    display: none;
  }

  .pwa-menu-item {
    display: none; /* Shown when install prompt triggers */
  }
}