:root {
  --bg: #f3efe7;
  --bg-alt: #fffaf2;
  --panel: rgba(255, 255, 255, 0.72);
  --panel-strong: rgba(255, 255, 255, 0.88);
  --text: #1f2333;
  --muted: #5a6278;
  --line: rgba(31, 35, 51, 0.1);
  --primary: #0f6b5a;
  --primary-strong: #0a4f44;
  --secondary: #c96f3b;
  --accent: #e8b64d;
  --shadow: 0 18px 45px rgba(35, 39, 58, 0.12);
  --hero-grad: radial-gradient(circle at top left, rgba(15, 107, 90, 0.24), transparent 38%),
    radial-gradient(circle at top right, rgba(201, 111, 59, 0.22), transparent 30%),
    linear-gradient(135deg, #f6f1e8 0%, #fefbf6 48%, #eef8f4 100%);
  --card-grad: linear-gradient(145deg, rgba(255, 255, 255, 0.85), rgba(247, 244, 238, 0.88));
}

body.dark {
  --bg: #0c1220;
  --bg-alt: #121b2f;
  --panel: rgba(15, 23, 42, 0.68);
  --panel-strong: rgba(15, 23, 42, 0.9);
  --text: #edf2ff;
  --muted: #aab6d3;
  --line: rgba(255, 255, 255, 0.12);
  --primary: #69e2c2;
  --primary-strong: #9df5de;
  --secondary: #ff9b62;
  --accent: #ffd86b;
  --shadow: 0 18px 50px rgba(1, 7, 20, 0.45);
  --hero-grad: radial-gradient(circle at top left, rgba(105, 226, 194, 0.2), transparent 32%),
    radial-gradient(circle at top right, rgba(255, 155, 98, 0.24), transparent 30%),
    linear-gradient(140deg, #0b1323 0%, #121b2f 55%, #17253f 100%);
  --card-grad: linear-gradient(155deg, rgba(18, 27, 47, 0.88), rgba(11, 19, 35, 0.92));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background 0.35s ease, color 0.35s ease;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.main-shell {
  min-height: 100vh;
  background: var(--hero-grad);
  position: relative;
}

.main-shell::before,
.main-shell::after {
  content: "";
  position: fixed;
  inset: auto;
  width: 24rem;
  height: 24rem;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(32px);
  opacity: 0.28;
  z-index: 0;
  animation: drift 18s ease-in-out infinite;
}

.main-shell::before {
  top: 8rem;
  right: -8rem;
  background: color-mix(in srgb, var(--secondary) 55%, transparent);
}

.main-shell::after {
  bottom: 4rem;
  left: -10rem;
  background: color-mix(in srgb, var(--primary) 55%, transparent);
  animation-delay: -8s;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(18px);
  background: color-mix(in srgb, var(--bg) 74%, transparent);
  border-bottom: 1px solid var(--line);
}

.nav-wrap,
.section,
.footer-wrap {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
  position: relative;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--secondary), var(--primary));
  display: grid;
  place-items: center;
  color: white;
  font-weight: 800;
  box-shadow: var(--shadow);
}

.brand-copy h1,
.brand-copy p {
  margin: 0;
}

.brand-copy h1 {
  font-size: 1rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.brand-copy p {
  color: var(--muted);
  font-size: 0.86rem;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem;
  transition: 0.3s ease;
}

.nav-links a,
.theme-toggle,
.cta-link,
.menu-toggle {
  border-radius: 999px;
  padding: 0.8rem 1rem;
  transition: 0.25s ease;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.95rem;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  background: var(--panel);
}

.theme-toggle,
.cta-link,
.primary-btn,
.secondary-btn,
.menu-toggle {
  border: 1px solid var(--line);
  background: var(--panel-strong);
  color: var(--text);
  cursor: pointer;
  box-shadow: var(--shadow);
}

.theme-toggle:hover,
.cta-link:hover,
.primary-btn:hover,
.secondary-btn:hover,
.menu-toggle:hover {
  transform: translateY(-2px);
}

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

.menu-toggle {
  display: none;
  font-weight: 700;
}

.hero {
  padding: 4.5rem 0 3rem;
  position: relative;
  z-index: 1;
}

.hero-grid,
.dual-grid,
.info-grid,
.contact-grid,
.gallery-grid,
.news-grid,
.rules-grid,
.achievement-grid,
.alumni-grid,
.cards-grid,
.message-grid {
  display: grid;
  gap: 1.25rem;
}

.hero-grid {
  grid-template-columns: 1.3fr 0.9fr;
  align-items: center;
}

.hero-copy,
.hero-card,
.panel,
.timeline-card,
.gallery-card,
.news-card,
.rule-card,
.achievement-card,
.alumni-card,
.contact-card,
.message-card,
.stat-card {
  background: var(--card-grad);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease, background 0.35s ease;
}

.hero-copy {
  padding: 2rem;
  animation: rise-in 0.8s ease both;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  background: var(--panel-strong);
  color: var(--primary-strong);
  font-size: 0.88rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero-copy h2,
.section-head h2,
.panel h3,
.gallery-card h3,
.news-card h3,
.rule-card h3,
.achievement-card h3,
.alumni-card h3,
.contact-card h3,
.message-card h3 {
  margin: 0;
}

.hero-copy h2 {
  font-size: clamp(2.4rem, 5vw, 4.5rem);
  line-height: 1.03;
  margin-top: 1rem;
}

.hero-copy p,
.panel p,
.section-head p,
.gallery-card p,
.news-card p,
.rule-card p,
.achievement-card p,
.alumni-card p,
.contact-card p,
.message-card p,
.timeline-card p,
li {
  color: var(--muted);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.5rem;
}

.primary-btn {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
}

.primary-btn,
.secondary-btn {
  padding: 0.95rem 1.25rem;
  border-radius: 18px;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-card {
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
  animation: rise-in 0.9s ease 0.15s both;
}

.hero-card::after {
  content: "";
  position: absolute;
  inset: auto -10% -20% auto;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 216, 107, 0.35), transparent 62%);
}

.hero-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 0%, rgba(255, 255, 255, 0.12) 45%, transparent 100%);
  transform: translateX(-120%);
  animation: shimmer 7s linear infinite;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.3rem;
}

.stat-card {
  padding: 1.1rem;
}

.stat-card strong {
  display: block;
  font-size: 1.8rem;
  margin-bottom: 0.25rem;
}

.section {
  padding: 1.25rem 0 3.25rem;
}

.section-head {
  max-width: 760px;
  margin-bottom: 1.4rem;
}

.dual-grid,
.contact-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.info-grid,
.cards-grid,
.gallery-grid,
.news-grid,
.rules-grid,
.achievement-grid,
.alumni-grid,
.message-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.panel,
.timeline-card,
.gallery-card,
.news-card,
.rule-card,
.achievement-card,
.alumni-card,
.contact-card,
.message-card {
  padding: 1.5rem;
}

.panel:hover,
.timeline-card:hover,
.gallery-card:hover,
.news-card:hover,
.rule-card:hover,
.achievement-card:hover,
.alumni-card:hover,
.contact-card:hover,
.message-card:hover,
.stat-card:hover {
  transform: translateY(-6px);
  border-color: color-mix(in srgb, var(--primary) 34%, var(--line));
}

.highlight-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.highlight-strip .panel {
  text-align: center;
}

.feature-list,
.clean-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}

.feature-list li,
.clean-list li {
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--line);
}

.feature-list li:last-child,
.clean-list li:last-child {
  border-bottom: 0;
}

.timeline {
  display: grid;
  gap: 1rem;
}

.tag {
  display: inline-block;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--primary) 14%, transparent);
  color: var(--primary-strong);
  font-size: 0.82rem;
  margin-bottom: 0.9rem;
}

.mini-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--secondary);
  margin-bottom: 0.55rem;
}

.split-banner {
  padding: 1.5rem;
  border-radius: 30px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--primary) 18%, transparent), color-mix(in srgb, var(--secondary) 18%, transparent));
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.split-banner::after {
  content: "";
  position: absolute;
  inset: auto -10% -50% auto;
  width: 18rem;
  height: 18rem;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent) 35%, transparent), transparent 65%);
}

.quote {
  font-size: 1.05rem;
  line-height: 1.8;
  font-style: italic;
}

.footer {
  border-top: 1px solid var(--line);
  margin-top: 1rem;
  background: color-mix(in srgb, var(--bg-alt) 72%, transparent);
}

.footer-wrap {
  padding: 1.5rem 0 2.5rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer small,
.footer a {
  color: var(--muted);
}

.map-frame {
  border: 0;
  width: 100%;
  min-height: 320px;
  border-radius: 24px;
}

.youtube-link {
  display: inline-flex;
  margin-top: 1rem;
  color: var(--primary-strong);
  font-weight: 600;
}

.notice-board {
  padding: 1.2rem;
  border-radius: 24px;
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  border: 1px solid var(--line);
}

.slideshow {
  position: relative;
  min-height: 420px;
  overflow: hidden;
  border-radius: 30px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.slide {
  position: absolute;
  inset: 0;
  padding: 2rem;
  display: grid;
  align-content: end;
  gap: 0.8rem;
  color: white;
  opacity: 0;
  transform: scale(1.03);
  transition: opacity 0.8s ease, transform 1.2s ease;
}

.slide.active {
  opacity: 1;
  transform: scale(1);
}

.slide::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(3, 8, 18, 0.05), rgba(3, 8, 18, 0.78));
  z-index: 0;
}

.slide > * {
  position: relative;
  z-index: 1;
}

.slide-one {
  background: linear-gradient(135deg, rgba(15, 107, 90, 0.72), rgba(4, 19, 44, 0.72)),
    url("https://images.unsplash.com/photo-1509062522246-3755977927d7?auto=format&fit=crop&w=1400&q=80") center/cover;
}

.slide-two {
  background: linear-gradient(135deg, rgba(201, 111, 59, 0.76), rgba(32, 16, 54, 0.72)),
    url("https://images.unsplash.com/photo-1523050854058-8df90110c9f1?auto=format&fit=crop&w=1400&q=80") center/cover;
}

.slide-three {
  background: linear-gradient(135deg, rgba(13, 69, 122, 0.72), rgba(9, 92, 70, 0.72)),
    url("https://images.unsplash.com/photo-1513258496099-48168024aec0?auto=format&fit=crop&w=1400&q=80") center/cover;
}

.slide-kicker {
  display: inline-flex;
  width: fit-content;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(12px);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.8rem;
}

.slide h3 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 3rem);
}

.slide p {
  margin: 0;
  max-width: 36rem;
  color: rgba(255, 255, 255, 0.92);
}

.slide-controls {
  position: absolute;
  inset: auto 1rem 1rem auto;
  display: flex;
  gap: 0.5rem;
  z-index: 2;
}

.slide-dot {
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 50%;
  border: 0;
  background: rgba(255, 255, 255, 0.45);
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease;
}

.slide-dot.active {
  background: white;
  transform: scale(1.15);
}

.audio-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.audio-card {
  padding: 1.5rem;
  border-radius: 28px;
  border: 1px solid var(--line);
  background: var(--card-grad);
  box-shadow: var(--shadow);
}

.audio-card audio {
  width: 100%;
  margin: 1rem 0;
}

.lyrics {
  margin: 0;
  padding: 1rem 1.1rem;
  border-radius: 18px;
  white-space: pre-line;
  background: color-mix(in srgb, var(--panel-strong) 75%, transparent);
  color: var(--muted);
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.75s ease, transform 0.75s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes shimmer {
  from {
    transform: translateX(-120%);
  }
  to {
    transform: translateX(160%);
  }
}

@keyframes drift {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  50% {
    transform: translate3d(1.75rem, -1.25rem, 0) scale(1.08);
  }
}

@media (max-width: 980px) {
  .hero-grid,
  .dual-grid,
  .contact-grid,
  .info-grid,
  .cards-grid,
  .gallery-grid,
  .news-grid,
  .rules-grid,
  .achievement-grid,
  .alumni-grid,
  .message-grid,
  .highlight-strip {
    grid-template-columns: 1fr 1fr;
  }

  .nav-wrap {
    flex-wrap: wrap;
    align-items: center;
  }

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

@media (max-width: 680px) {
  .hero-grid,
  .dual-grid,
  .contact-grid,
  .info-grid,
  .cards-grid,
  .gallery-grid,
  .news-grid,
  .rules-grid,
  .achievement-grid,
  .alumni-grid,
  .message-grid,
  .highlight-strip,
  .hero-metrics {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 3rem;
  }

  .hero-copy,
  .hero-card,
  .panel,
  .timeline-card,
  .gallery-card,
  .news-card,
  .rule-card,
  .achievement-card,
  .alumni-card,
  .contact-card,
  .message-card {
    border-radius: 22px;
  }

  .hero-copy h2 {
    font-size: 2.3rem;
  }

  .brand {
    flex: 1;
    min-width: 0;
  }

  .brand-copy p {
    display: none;
  }

  .nav-actions {
    margin-left: auto;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .nav-links {
    order: 4;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.35rem;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    padding: 0;
    pointer-events: none;
    background: var(--panel-strong);
    border-radius: 22px;
    border: 1px solid transparent;
  }

  .nav-links.open {
    max-height: 32rem;
    opacity: 1;
    pointer-events: auto;
    padding: 0.65rem;
    border-color: var(--line);
    margin-top: 0.75rem;
  }

  .nav-links a,
  .nav-links a.active {
    width: 100%;
    border-radius: 16px;
  }

  .theme-toggle,
  .menu-toggle {
    padding: 0.75rem 0.9rem;
  }

  .slideshow {
    min-height: 360px;
  }

  .slide {
    padding: 1.25rem;
  }
}