:root {
  color-scheme: dark;
  --bg: #090b12;
  --panel: rgba(18, 22, 35, 0.82);
  --panel-solid: #141827;
  --line: rgba(255, 255, 255, 0.14);
  --text: #fff7e7;
  --muted: rgba(255, 247, 231, 0.72);
  --gold: #ffd37a;
  --amber: #ff9f43;
  --cyan: #38d9ff;
  --red: #ef3f32;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.42);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 10% 5%, rgba(255, 211, 122, 0.16), transparent 30%),
    radial-gradient(circle at 92% 18%, rgba(56, 217, 255, 0.18), transparent 28%),
    linear-gradient(180deg, #111420 0%, var(--bg) 52%, #05060a 100%);
  color: var(--text);
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6), transparent 70%);
}

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

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 72px;
  padding: 0 clamp(18px, 4vw, 64px);
  background: rgba(5, 6, 10, 0.66);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: max-content;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  box-shadow: 0 0 22px rgba(255, 211, 122, 0.28);
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(18px, 4vw, 44px);
  color: var(--muted);
  font-size: 15px;
}

.nav-links a:hover,
.site-footer a:hover {
  color: var(--gold);
}

.header-download,
.float-download,
.download-button,
.ghost-button {
  min-height: 44px;
  border: 1px solid rgba(255, 211, 122, 0.38);
  border-radius: 8px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.header-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  font-weight: 800;
  color: #1b0d03;
  background: linear-gradient(135deg, #ffe7a6, #ffb34e 54%, #ff6b35);
  box-shadow: 0 12px 32px rgba(255, 145, 49, 0.24);
}

.hero {
  position: relative;
  display: grid;
  min-height: 100svh;
  overflow: hidden;
  isolation: isolate;
}

.hero picture,
.hero-media,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-media {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-shade {
  z-index: 1;
  background:
    linear-gradient(90deg, rgba(5, 6, 10, 0.88) 0%, rgba(5, 6, 10, 0.52) 42%, rgba(5, 6, 10, 0.08) 72%),
    linear-gradient(180deg, rgba(5, 6, 10, 0.2) 0%, rgba(5, 6, 10, 0.08) 58%, #090b12 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  align-self: end;
  width: min(720px, calc(100% - 36px));
  margin: 0 0 clamp(42px, 9vw, 108px) clamp(18px, 7vw, 96px);
  padding-top: 92px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--gold);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: clamp(56px, 9vw, 118px);
  line-height: 0.95;
  letter-spacing: 0;
  text-shadow: 0 12px 36px rgba(0, 0, 0, 0.42), 0 0 28px rgba(255, 179, 78, 0.24);
}

.hero-copy {
  max-width: 640px;
  margin-bottom: 28px;
  color: rgba(255, 247, 231, 0.84);
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.8;
}

.hero-actions,
.event-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
}

.download-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-width: 202px;
  padding: 0 22px;
  color: #081016;
  font-size: 18px;
  font-weight: 900;
  background: linear-gradient(135deg, #67f5ff 0%, #24c9ff 48%, #0091ff 100%);
  border-color: rgba(122, 238, 255, 0.7);
  box-shadow: 0 18px 44px rgba(0, 172, 255, 0.36), inset 0 1px rgba(255, 255, 255, 0.7);
}

.download-button img {
  width: 28px;
  height: 28px;
}

.download-button.compact {
  min-width: 178px;
}

.ghost-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
}

.header-download:hover,
.download-button:hover,
.ghost-button:hover,
.float-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 52px rgba(0, 0, 0, 0.3);
}

.launch-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.launch-strip span {
  min-height: 36px;
  padding: 8px 14px;
  color: rgba(255, 247, 231, 0.88);
  background: rgba(15, 19, 31, 0.68);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  backdrop-filter: blur(16px);
}

.intro-section,
.feature-grid,
.event-section,
.gallery-section {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
}

.intro-section {
  display: grid;
  grid-template-columns: minmax(240px, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(26px, 6vw, 84px);
  padding: clamp(64px, 9vw, 112px) 0 32px;
}

.section-heading h2,
.event-copy h2 {
  margin-bottom: 0;
  font-size: clamp(32px, 5vw, 58px);
  line-height: 1.12;
  letter-spacing: 0;
}

.intro-copy,
.event-copy p,
.feature-card p {
  color: var(--muted);
  line-height: 1.85;
}

.intro-copy {
  margin: 8px 0 0;
  font-size: 18px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  padding: 32px 0 clamp(64px, 10vw, 120px);
}

.feature-card {
  min-height: 246px;
  padding: 24px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.035));
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.feature-icon {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: 24px;
  color: #1a0e03;
  font-weight: 900;
  background: linear-gradient(135deg, var(--gold), var(--amber));
  border-radius: 8px;
}

.feature-card h3 {
  margin-bottom: 12px;
  font-size: 22px;
}

.feature-card p {
  margin-bottom: 0;
  font-size: 15px;
}

.event-section {
  display: grid;
  grid-template-columns: minmax(280px, 0.82fr) minmax(0, 1.18fr);
  gap: clamp(24px, 5vw, 54px);
  align-items: center;
  padding: clamp(28px, 5vw, 56px);
  background:
    linear-gradient(135deg, rgba(255, 211, 122, 0.14), transparent 42%),
    linear-gradient(180deg, rgba(20, 24, 39, 0.92), rgba(10, 12, 20, 0.92));
  border: 1px solid rgba(255, 211, 122, 0.2);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.event-copy p {
  margin: 20px 0 26px;
  font-size: 17px;
}

.qrcode {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 72px;
  padding: 8px 14px 8px 8px;
  color: var(--gold);
  font-weight: 800;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
}

.qrcode img {
  width: 58px;
  height: 58px;
  border-radius: 6px;
}

.event-poster {
  width: 100%;
  aspect-ratio: 1536 / 1024;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  box-shadow: 0 22px 66px rgba(0, 0, 0, 0.34);
}

.gallery-section {
  padding: clamp(72px, 10vw, 120px) 0;
}

.gallery-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.62fr;
  grid-auto-rows: 270px;
  gap: 16px;
  margin-top: 28px;
}

.gallery-grid img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.gallery-grid img:first-child {
  grid-row: span 2;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 28px clamp(18px, 4vw, 64px);
  color: var(--muted);
  border-top: 1px solid var(--line);
  background: rgba(5, 6, 10, 0.7);
}

.float-download {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 30;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  color: #081016;
  font-weight: 900;
  background: linear-gradient(135deg, #67f5ff, #0091ff);
  box-shadow: 0 16px 38px rgba(0, 172, 255, 0.35);
}

@media (max-width: 980px) {
  .nav-links {
    display: none;
  }

  .intro-section,
  .event-section {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 720px) {
  .site-header {
    height: 64px;
    padding: 0 14px;
  }

  .brand span {
    font-size: 16px;
  }

  .brand img {
    width: 36px;
    height: 36px;
  }

  .header-download {
    display: none;
  }

  .hero {
    min-height: 820px;
  }

  .hero-media {
    object-position: center top;
  }

  .hero-shade {
    background:
      linear-gradient(180deg, rgba(5, 6, 10, 0.12) 0%, rgba(5, 6, 10, 0.15) 42%, rgba(5, 6, 10, 0.92) 77%, #090b12 100%);
  }

  .hero-content {
    width: calc(100% - 28px);
    margin: 0 auto 34px;
    padding-top: 72px;
  }

  h1 {
    font-size: clamp(46px, 16vw, 72px);
  }

  .hero-copy {
    font-size: 16px;
    line-height: 1.72;
  }

  .hero-actions,
  .event-actions {
    align-items: stretch;
  }

  .download-button,
  .ghost-button {
    width: 100%;
  }

  .feature-grid,
  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .feature-card {
    min-height: 0;
  }

  .event-section {
    width: calc(100% - 28px);
    padding: 20px;
  }

  .qrcode {
    width: 100%;
    justify-content: center;
  }

  .gallery-grid {
    grid-auto-rows: auto;
  }

  .gallery-grid img,
  .gallery-grid img:first-child {
    grid-row: auto;
    aspect-ratio: 16 / 10;
  }

  .gallery-grid img:nth-child(2) {
    aspect-ratio: 3 / 4;
  }

  .site-footer {
    padding-bottom: 78px;
  }

  .float-download {
    display: inline-flex;
  }
}

@media (max-width: 420px) {
  .hero {
    min-height: 760px;
  }

  .section-heading h2,
  .event-copy h2 {
    font-size: 30px;
  }

  .launch-strip span {
    flex: 1 1 auto;
    text-align: center;
  }
}