:root {
  --bg: #090b14;
  --panel: #121829;
  --panel-soft: #1a2238;
  --text: #f2f6ff;
  --text-dim: #a7b1c9;
  --primary: #7f63ff;
  --primary-2: #53b8ff;
  --line: rgba(255, 255, 255, 0.12);
  --radius: 16px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 20% -10%, #232c5a, transparent 38%),
    radial-gradient(circle at 90% 10%, #24153e, transparent 30%),
    linear-gradient(180deg, #070910 0%, #090b14 100%);
  scroll-behavior: smooth;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px min(6vw, 72px);
  backdrop-filter: blur(14px);
  background: rgba(8, 12, 24, 0.78);
  border-bottom: 1px solid var(--line);
}

.logo-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-image {
  width: 38px;
  height: 38px;
  object-fit: contain;
}

.logo-text {
  font-weight: 800;
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  color: var(--text-dim);
  font-size: 14px;
}

.site-nav a:hover {
  color: var(--text);
}

.header-cta {
  padding: 10px 16px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  font-size: 14px;
  font-weight: 700;
}

main {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 32px;
  align-items: center;
  padding: 72px 0 32px;
}

.eyebrow {
  margin: 0 0 10px;
  color: #8aa4ff;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(30px, 4.2vw, 52px);
  line-height: 1.15;
}

.hero-desc {
  margin: 18px 0 0;
  color: var(--text-dim);
  line-height: 1.85;
  font-size: 16px;
}

.hero-actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 130px;
  padding: 12px 20px;
  border-radius: 12px;
  font-weight: 700;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff;
}

.btn-ghost {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.hero-visual {
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.hero-visual img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.stats {
  margin: 30px 0 26px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.stats article {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 14px;
  text-align: center;
}

.stat-value {
  margin: 0;
  font-size: 32px;
  font-weight: 900;
}

.stat-label {
  margin: 8px 0 0;
  color: var(--text-dim);
  font-size: 13px;
}

.section {
  padding: 56px 0 10px;
}

.section-title p {
  margin: 0 0 8px;
  color: #90b4ff;
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.section-title h2 {
  margin: 0;
  font-size: clamp(24px, 3vw, 36px);
}

.feature-grid {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.feature-card {
  border-radius: var(--radius);
  padding: 22px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
}

.feature-card h3 {
  margin: 0;
  font-size: 20px;
}

.feature-card p {
  margin: 10px 0 0;
  line-height: 1.75;
  color: var(--text-dim);
}

.shot-grid {
  margin-top: 22px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 12px;
}

.shot-grid img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 14px;
  min-height: 220px;
}

.cards .deck-grid {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.deck {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-soft);
  padding: 18px;
}

.deck h3 {
  margin: 0;
}

.deck p {
  margin: 10px 0 0;
  color: var(--text-dim);
  line-height: 1.75;
}

.faq-list {
  margin-top: 16px;
  display: grid;
  gap: 10px;
}

details {
  border: 1px solid var(--line);
  background: #10172a;
  border-radius: 12px;
  padding: 14px 16px;
}

summary {
  cursor: pointer;
  font-weight: 700;
}

details p {
  margin: 10px 0 0;
  color: var(--text-dim);
  line-height: 1.7;
}

.download {
  margin: 52px 0 70px;
  text-align: center;
  padding: 34px 18px;
  border-radius: 18px;
  background: linear-gradient(120deg, rgba(127, 99, 255, 0.2), rgba(83, 184, 255, 0.15));
  border: 1px solid rgba(144, 174, 255, 0.4);
}

.download h2 {
  margin: 0;
  font-size: clamp(24px, 3vw, 36px);
}

.download p {
  margin: 10px auto 0;
  max-width: 640px;
  color: #d6dfff;
}

.download-actions {
  margin-top: 22px;
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.site-footer {
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 18px min(6vw, 72px);
  color: var(--text-dim);
  font-size: 13px;
}

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

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

  .stats,
  .feature-grid,
  .cards .deck-grid {
    grid-template-columns: 1fr 1fr;
  }

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

@media (max-width: 640px) {
  .site-header {
    padding: 14px 14px;
  }

  main {
    width: calc(100% - 22px);
  }

  .stats,
  .feature-grid,
  .cards .deck-grid,
  .shot-grid {
    grid-template-columns: 1fr;
  }

  .header-cta {
    display: none;
  }
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

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