:root {
  --paper: #f4ead8;
  --paper-2: #efe3cd;
  --ink: #1a3348;
  --slate: #5e7a90;
  --sky: #3d9fd8;
  --sky-deep: #1f7ab8;
  --coral: #e87a55;
  --gold: #e8c46a;
  --mint: #3aa88c;
  --ivory: #fffaf1;
  --line: rgba(26, 51, 72, 0.12);
  --shadow: 0 18px 40px rgba(26, 51, 72, 0.12);
  --radius: 28px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 12% 8%, rgba(61, 159, 216, 0.16), transparent 28%),
    radial-gradient(circle at 88% 0%, rgba(232, 122, 85, 0.14), transparent 26%),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 27px,
      rgba(26, 51, 72, 0.035) 28px
    ),
    var(--paper);
  line-height: 1.55;
}

a { color: inherit; }
img, svg { display: block; max-width: 100%; }

.wrap {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(244, 234, 216, 0.82);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.04em;
}
.brand img { width: 36px; height: 36px; }
.nav {
  display: flex;
  gap: 22px;
  font-size: 15px;
}
.nav a { text-decoration: none; color: var(--slate); }
.nav a:hover { color: var(--ink); }
.header-cta {
  background: var(--ink);
  color: var(--ivory);
  text-decoration: none;
  padding: 10px 16px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 14px;
}

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
  padding: 72px 0 40px;
}
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--ivory);
  border: 2px solid var(--ink);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 700;
  margin: 0 0 18px;
}
.hero h1 {
  font-size: clamp(36px, 6vw, 64px);
  line-height: 1.08;
  margin: 0 0 18px;
  letter-spacing: -0.03em;
}
.hero h1 em {
  font-style: normal;
  color: var(--sky-deep);
  background: linear-gradient(transparent 62%, rgba(232, 196, 106, 0.7) 62%);
}
.lede {
  font-size: 18px;
  color: var(--slate);
  max-width: 36em;
  margin: 0 0 28px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 800;
  border: 2px solid var(--ink);
}
.btn-primary { background: var(--coral); color: #fff; border-color: #c45d3d; }
.btn-ghost { background: var(--ivory); }
.fineprint { margin: 14px 0 0; color: var(--slate); font-size: 13px; }

.tv {
  background: #173742;
  border-radius: 36px;
  padding: 22px 22px 18px;
  box-shadow: var(--shadow);
  transform: rotate(2.5deg);
}
.tv-screen {
  background: linear-gradient(180deg, #1f4652, #0f2730);
  border-radius: 22px;
  padding: 22px;
  min-height: 340px;
}
.tv-title { color: #e8c46a; font-weight: 800; margin: 0 0 6px; }
.tv-sub { color: #b8c5ca; font-size: 13px; margin: 0 0 18px; }
.hub {
  display: grid;
  gap: 10px;
}
.hub-card {
  border-radius: 16px;
  padding: 14px 16px;
  color: #1a3348;
  font-weight: 800;
}
.hub-card small { display: block; font-weight: 600; opacity: 0.75; margin-top: 2px; }
.hub-card.c { background: #e87a55; }
.hub-card.r { background: #4db6a9; }
.hub-card.novel { background: #6eb8e0; }
.hub-card.f { background: #e8c46a; }
.tv-bezel {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 12px;
}
.tv-bezel i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #e87a55;
  display: block;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding: 8px 0 56px;
}
.stat {
  background: var(--ivory);
  border: 2px solid var(--ink);
  border-radius: 20px;
  padding: 16px 18px;
}
.stat b { display: block; font-size: 28px; line-height: 1.1; }
.stat span { color: var(--slate); font-size: 13px; }

.section { padding: 24px 0 72px; }
.section h2 {
  font-size: clamp(28px, 4vw, 42px);
  margin: 0 0 10px;
  letter-spacing: -0.03em;
}
.section .intro { color: var(--slate); margin: 0 0 28px; max-width: 40em; }

.tracks {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  align-items: stretch;
}
.track {
  background: var(--ivory);
  border: 3px solid var(--ink);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 8px 8px 0 var(--ink);
  height: 100%;
  box-sizing: border-box;
}
.track:nth-child(1) { transform: rotate(-1.2deg); }
.track:nth-child(2) { transform: rotate(1deg); }
.track:nth-child(3) { transform: rotate(0.8deg); }
.track:nth-child(4) { transform: rotate(-0.7deg); }
.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
}
.b-coral { background: #f8c9b8; }
.b-mint { background: #c8ebe3; }
.b-sky { background: #c5e4f6; }
.b-gold { background: #f3e3ae; }
.track h3 { margin: 0 0 8px; font-size: 24px; }
.track p { margin: 0; color: var(--slate); }

.loop {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.step {
  background: var(--sky-deep);
  color: var(--ivory);
  border-radius: 24px;
  padding: 22px;
  min-height: 160px;
}
.step:nth-child(2) { background: var(--coral); }
.step:nth-child(3) { background: var(--mint); }
.step:nth-child(4) { background: #173742; }
.step b { display: block; font-size: 13px; opacity: 0.75; margin-bottom: 8px; }
.step h3 { margin: 0 0 8px; font-size: 22px; }
.step p { margin: 0; font-size: 14px; opacity: 0.9; }

.not-school {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 28px;
  align-items: center;
  background: #173742;
  color: var(--ivory);
  border-radius: 36px;
  padding: 36px;
}
.not-school h2 { color: var(--gold); }
.not-school .intro { color: #b8c5ca; }
.nope {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.nope li {
  list-style: none;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 14px 16px;
}
.nope { margin: 0; padding: 0; }
.nope s { color: #f3a98a; }

.devices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.device {
  background: var(--ivory);
  border-radius: var(--radius);
  padding: 28px;
  border: 2px solid var(--line);
}
.device h3 { margin: 0 0 8px; }

.download {
  background: var(--ivory);
  border: 3px dashed var(--coral);
  border-radius: 36px;
  padding: 36px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
  align-items: center;
}
.download .btn[aria-disabled="true"] {
  opacity: 0.55;
  pointer-events: none;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 48px;
  color: var(--slate);
  font-size: 13px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

@media (max-width: 860px) {
  .nav { display: none; }
  .hero, .tracks, .loop, .stats, .not-school, .devices, .download {
    grid-template-columns: 1fr;
  }
  .track:nth-child(n) { transform: none; margin-top: 0; }
  .tv { transform: none; }
  .hero { padding-top: 36px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .track, .tv { transform: none; }
}