:root {
  --crimson: #8b1524;
  --crimson-deep: #5c0d18;
  --gold: #c9a227;
  --gold-soft: #e8d48b;
  --ink: #0a0908;
  --ink-soft: #161210;
  --paper: #f3ebe0;
  --muted: rgba(243, 235, 224, 0.62);
  --line: rgba(201, 162, 39, 0.28);
  --max: 1180px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-body: "Source Sans 3", "PingFang SC", "Microsoft YaHei", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--paper);
  background: var(--ink);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

button,
.btn {
  font: inherit;
  cursor: pointer;
  border: 0;
}

.container {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem clamp(1.2rem, 4vw, 3rem);
  transition: background 0.4s var(--ease), backdrop-filter 0.4s var(--ease), border-color 0.4s;
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  background: rgba(10, 9, 8, 0.78);
  backdrop-filter: blur(16px);
  border-bottom-color: var(--line);
}

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

.brand img {
  height: 36px;
  width: auto;
  filter: drop-shadow(0 0 12px rgba(201, 162, 39, 0.25));
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  white-space: nowrap;
}

.brand-text strong {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand-text span {
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--gold-soft);
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  flex-shrink: 0;
}

.nav a {
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  transition: color 0.25s;
  white-space: nowrap;
}

.nav a:hover {
  color: var(--gold-soft);
}

.nav-cta {
  padding: 0.55rem 1.1rem;
  border: 1px solid var(--gold);
  color: var(--gold-soft) !important;
  transition: background 0.25s, color 0.25s;
}

.nav-cta:hover {
  background: var(--gold);
  color: var(--ink) !important;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  background: transparent;
  color: var(--paper);
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  margin: 5px auto;
  background: currentColor;
}

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 7rem 0 4.5rem;
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.08);
  animation: heroDrift 28s ease-in-out infinite alternate;
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(10, 9, 8, 0.35) 0%, rgba(10, 9, 8, 0.2) 35%, rgba(10, 9, 8, 0.82) 78%, rgba(10, 9, 8, 0.96) 100%),
    linear-gradient(90deg, rgba(92, 13, 24, 0.35), transparent 55%);
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 7vw, 5.4rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.05;
  margin: 0 0 1rem;
  text-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  opacity: 0;
  animation: riseIn 1s var(--ease) 0.15s forwards;
}

.hero-brand em {
  font-style: normal;
  color: var(--gold-soft);
}

.hero-title {
  max-width: 18ch;
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.8vw, 2rem);
  font-weight: 600;
  letter-spacing: 0.18em;
  opacity: 0;
  animation: riseIn 1s var(--ease) 0.35s forwards;
}

.hero-lead {
  max-width: 34rem;
  margin: 0 0 2rem;
  color: var(--muted);
  font-size: 1.05rem;
  opacity: 0;
  animation: riseIn 1s var(--ease) 0.5s forwards;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  opacity: 0;
  animation: riseIn 1s var(--ease) 0.65s forwards;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.75rem 1.45rem;
  letter-spacing: 0.12em;
  transition: transform 0.25s var(--ease), background 0.25s, color 0.25s, border-color 0.25s;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--gold-soft), var(--gold));
  color: var(--ink);
  font-weight: 600;
}

.btn-ghost {
  border: 1px solid rgba(243, 235, 224, 0.35);
  background: rgba(10, 9, 8, 0.28);
  color: var(--paper);
}

.btn-ghost:hover {
  border-color: var(--gold);
  color: var(--gold-soft);
}

.section {
  padding: clamp(4.5rem, 10vw, 7.5rem) 0;
  position: relative;
}

.section-label {
  display: inline-block;
  margin-bottom: 1rem;
  color: var(--gold);
  font-size: 0.78rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
}

.section-title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.2;
}

.section-desc {
  max-width: 40rem;
  margin: 0;
  color: var(--muted);
}

.about {
  background:
    radial-gradient(ellipse at 10% 20%, rgba(139, 21, 36, 0.22), transparent 45%),
    var(--ink);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
  margin-top: 2.5rem;
}

.about-copy p + p {
  margin-top: 1rem;
}

.about-copy p {
  color: var(--muted);
}

.about-figure {
  position: relative;
  min-height: 420px;
  overflow: hidden;
}

.about-figure img {
  width: 100%;
  height: 100%;
  min-height: 420px;
  object-fit: cover;
}

.about-figure::before {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid var(--line);
  pointer-events: none;
  z-index: 1;
}

.about-figure::after {
  content: "SVCCI · 2026";
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  z-index: 2;
  padding: 0.35rem 0.7rem;
  background: rgba(10, 9, 8, 0.65);
  color: var(--gold-soft);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
}

.feature-band {
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-soft) 50%, var(--ink) 100%);
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2.8rem;
}

.feature {
  padding: 1.6rem 0 0;
  border-top: 1px solid var(--line);
}

.feature h3 {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: 0.08em;
}

.feature p {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.feature-num {
  display: block;
  margin-bottom: 0.8rem;
  color: var(--gold);
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
}

.campus {
  background: var(--ink);
}

.campus-stage {
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 0.8rem;
  min-height: 560px;
}

.campus-main,
.campus-side figure {
  position: relative;
  overflow: hidden;
  background: #1a1410;
}

.campus-main img,
.campus-side img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 1.1s var(--ease);
}

.campus-main:hover img,
.campus-side figure:hover img {
  transform: scale(1.05);
}

.campus-main {
  min-height: 560px;
}

.campus-side {
  display: grid;
  grid-template-rows: 1fr 1fr;
  gap: 0.8rem;
}

.campus-side figure {
  min-height: 0;
}

.caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 1.2rem 1.1rem;
  background: linear-gradient(transparent, rgba(10, 9, 8, 0.85));
  font-size: 0.9rem;
  letter-spacing: 0.08em;
}

.campus-strip {
  margin-top: 0.8rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.8rem;
}

.campus-strip figure {
  position: relative;
  overflow: hidden;
  min-height: 180px;
  background: #1a1410;
}

.campus-strip img {
  width: 100%;
  height: 100%;
  min-height: 180px;
  object-fit: cover;
  transition: transform 1.1s var(--ease);
}

.campus-strip figure:hover img {
  transform: scale(1.05);
}

.campus-strip figcaption {
  position: absolute;
  left: 0.8rem;
  bottom: 0.8rem;
  padding: 0.3rem 0.55rem;
  background: rgba(10, 9, 8, 0.7);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--gold-soft);
}

.cinema-frame {
  position: relative;
  margin-top: 2.5rem;
  min-height: 420px;
  overflow: hidden;
}

.cinema-frame img {
  width: 100%;
  height: 100%;
  min-height: 420px;
  object-fit: cover;
  filter: brightness(0.55) saturate(0.9);
}

.cinema-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: linear-gradient(180deg, rgba(10, 9, 8, 0.15), rgba(92, 13, 24, 0.45));
}

.section-desc a {
  color: var(--gold-soft);
  border-bottom: 1px solid rgba(201, 162, 39, 0.45);
}

.world {
  background:
    radial-gradient(ellipse at 80% 10%, rgba(201, 162, 39, 0.12), transparent 40%),
    var(--ink-soft);
}

.world-rail {
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 0.8rem;
}

.world-item {
  position: relative;
  overflow: hidden;
  min-height: 280px;
  background: #1a1410;
}

.world-item:nth-child(1) {
  grid-column: span 7;
}

.world-item:nth-child(2) {
  grid-column: span 5;
}

.world-item:nth-child(3) {
  grid-column: span 4;
}

.world-item:nth-child(4) {
  grid-column: span 4;
}

.world-item:nth-child(5) {
  grid-column: span 4;
}

.world-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 1.1s var(--ease), filter 0.5s;
  filter: saturate(0.92) contrast(1.05);
}

.world-item:hover img {
  transform: scale(1.04);
  filter: saturate(1.05) contrast(1.08);
}

.world-item figcaption {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  padding: 0.4rem 0.7rem;
  background: rgba(10, 9, 8, 0.7);
  border-left: 2px solid var(--gold);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
}

.join {
  position: relative;
  isolation: isolate;
  overflow: hidden;
}

.join-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.join-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.35) saturate(0.85);
}

.join-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(10, 9, 8, 0.92) 0%, rgba(10, 9, 8, 0.7) 55%, rgba(92, 13, 24, 0.45) 100%);
}

.join-panel {
  max-width: 38rem;
}

.join-meta {
  display: grid;
  gap: 0.85rem;
  margin: 2rem 0;
  padding: 0;
  list-style: none;
}

.join-meta li {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 1rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid rgba(243, 235, 224, 0.12);
}

.join-meta span {
  color: var(--gold);
  letter-spacing: 0.12em;
  font-size: 0.82rem;
}

.join-meta strong {
  font-weight: 500;
  letter-spacing: 0.04em;
}

.site-footer {
  padding: 2.5rem 0 3rem;
  border-top: 1px solid var(--line);
  background: #070605;
}

.footer-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1.5rem;
  align-items: end;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.2rem;
  letter-spacing: 0.12em;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--gold-soft);
}

.footer-note {
  margin-top: 1.5rem;
  color: rgba(243, 235, 224, 0.45);
  font-size: 0.82rem;
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes heroDrift {
  from {
    transform: scale(1.08) translate3d(0, 0, 0);
  }
  to {
    transform: scale(1.14) translate3d(-1.5%, -1%, 0);
  }
}

@media (max-width: 960px) {
  .about-grid,
  .campus-stage,
  .feature-list,
  .campus-strip {
    grid-template-columns: 1fr;
  }

  .campus-strip {
    grid-template-columns: 1fr 1fr;
  }

  .campus-main,
  .about-figure,
  .about-figure img,
  .cinema-frame,
  .cinema-frame img {
    min-height: 320px;
  }

  .world-item,
  .world-item:nth-child(1),
  .world-item:nth-child(2),
  .world-item:nth-child(3),
  .world-item:nth-child(4),
  .world-item:nth-child(5) {
    grid-column: span 12;
    min-height: 220px;
  }
}

@media (max-width: 760px) {
  .menu-toggle {
    display: block;
  }

  .nav {
    position: fixed;
    inset: 0 0 auto;
    top: 68px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 1rem 1.2rem 1.4rem;
    background: rgba(10, 9, 8, 0.96);
    border-bottom: 1px solid var(--line);
  }

  .nav.is-open {
    display: flex;
  }

  .nav a {
    padding: 0.85rem 0;
    border-bottom: 1px solid rgba(243, 235, 224, 0.08);
  }

  .nav-cta {
    margin-top: 0.6rem;
    text-align: center;
  }

  .hero-content {
    padding-bottom: 4rem;
  }

  .brand-text span {
    display: none;
  }
}