@charset "UTF-8";

:root {
  --cloud: #f3efe6;
  --foam: #fffaf1;
  --navy: #13233f;
  --ink: #1a2433;
  --muted: #5d6a7c;
  --sky: #6eb6f2;
  --gold: #e0b85a;
  --rose: #d46a6a;
  --line: #d9d0c0;
  --hard: 8px 8px 0 rgba(19, 35, 63, 0.2);
  --hard-g: 8px 8px 0 rgba(224, 184, 90, 0.3);
  --shell: 1140px;
  --header-h: 72px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 14px); }
body {
  margin: 0;
  padding-top: var(--header-h);
  color: var(--ink);
  background:
    radial-gradient(circle at 88% 6%, rgba(110, 182, 242, 0.18), transparent 32%),
    radial-gradient(circle at 8% 40%, rgba(224, 184, 90, 0.12), transparent 28%),
    repeating-linear-gradient(180deg, rgba(19, 35, 63, 0.03) 0 1px, transparent 1px 22px),
    var(--cloud);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  line-height: 1.7;
}
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button { border: 0; background: none; color: inherit; font: inherit; cursor: pointer; }
img { display: block; max-width: 100%; }
h1, h2, h3, p, ul, figure { margin: 0; padding: 0; }
ul { list-style: none; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
.shell { width: min(calc(100% - 40px), var(--shell)); margin: 0 auto; }
.section { padding: 88px 0; }
.kicker { color: var(--rose); font-size: 12px; font-weight: 800; letter-spacing: 0.22em; margin-bottom: 10px; }
.section-head { max-width: 640px; margin-bottom: 40px; }
.section-head h2 { font-size: clamp(28px, 3.6vw, 42px); font-weight: 800; letter-spacing: -0.03em; }
.section-head p { margin-top: 10px; color: var(--muted); }

.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 1000; height: var(--header-h);
  background: rgba(243, 239, 230, 0.92); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px);
}
.header-inner { display: flex; height: 100%; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: inline-flex; gap: 10px; align-items: center; }
.brand img { width: 40px; height: 40px; border-radius: 12px; object-fit: cover; box-shadow: var(--hard-g); }
.brand strong { display: block; font-size: 16px; }
.brand small { display: block; color: var(--muted); font-size: 11px; }
.site-nav ul { display: flex; gap: 2px; }
.site-nav a { display: block; padding: 8px 12px; border-radius: 999px; font-size: 14px; font-weight: 600; color: var(--muted); }
.site-nav a.is-current, .site-nav a:hover { background: var(--navy); color: #fff; }
.btn, .header-cta {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 11px 18px; border-radius: 14px; font-size: 13px; font-weight: 800;
}
.header-cta, .btn-navy { background: var(--navy); color: #fff; box-shadow: var(--hard); }
.btn-gold { background: var(--gold); color: var(--navy); box-shadow: var(--hard-g); }
.btn-ghost { border: 1.5px solid var(--ink); background: var(--foam); }
.header-cta:hover, .btn-navy:hover, .btn-gold:hover, .btn-ghost:hover { transform: translate(-2px, -2px); }
.mobile-tools { display: none; gap: 8px; align-items: center; }
.menu-toggle { width: 40px; height: 40px; border: 1px solid var(--line); border-radius: 10px; display: grid; place-items: center; }
.menu-toggle span, .menu-toggle span::before, .menu-toggle span::after {
  display: block; width: 16px; height: 2px; background: var(--ink); position: relative;
}
.menu-toggle span::before, .menu-toggle span::after { content: ""; position: absolute; left: 0; }
.menu-toggle span::before { top: -5px; } .menu-toggle span::after { top: 5px; }

.hero { padding: 40px 0 56px; }
.hero-inner { display: grid; grid-template-columns: 1fr 1.05fr; gap: 36px; align-items: center; }
.hero-copy { order: 1; }
.hero-visual { order: 2; }
.hero h1 { font-size: clamp(40px, 5.8vw, 68px); font-weight: 900; letter-spacing: -0.05em; line-height: 0.96; }
.hero h1 em { display: block; margin-top: 10px; font-style: normal; font-size: 0.34em; color: var(--rose); font-weight: 700; }
.hero-lead { margin-top: 18px; max-width: 460px; color: var(--muted); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 16px; font-size: 13px; font-weight: 700; color: var(--navy); }

.dropdesk {
  position: relative;
  padding: 18px;
  border-radius: 28px 8px 28px 8px;
  background: var(--navy);
  color: #e8f1ff;
  box-shadow: 16px 18px 0 rgba(224, 184, 90, 0.28);
}
.dd-top { display: flex; justify-content: space-between; font-size: 11px; font-weight: 800; letter-spacing: 0.16em; color: var(--gold); margin-bottom: 12px; }
.dd-select {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 14px; margin-bottom: 12px; background: rgba(255,255,255,0.08);
  border-radius: 12px; font-weight: 800;
}
.dd-select span { color: var(--gold); }
.chapters { display: grid; gap: 8px; margin-bottom: 12px; }
.ch {
  display: grid; grid-template-columns: 1fr auto; gap: 8px; align-items: center;
  padding: 10px 12px; background: var(--foam); color: var(--ink); font-size: 13px; font-weight: 800;
}
.ch.is-on { background: var(--gold); }
.ch small { color: var(--muted); font-weight: 700; }
.dd-preview { display: grid; grid-template-columns: 1fr 168px; gap: 12px; align-items: center; }
.dd-note { font-size: 13px; color: rgba(255,255,255,0.78); }
.dd-preview img {
  width: 168px; height: auto; max-height: 298px; object-fit: contain;
  border: 3px solid var(--gold); background: #0c1524;
}
.float-chip {
  position: absolute; z-index: 2; padding: 10px 12px;
  background: var(--foam); color: var(--ink); font-size: 12px; font-weight: 800;
  box-shadow: var(--hard-g); animation: bob 4.8s ease-in-out infinite; border-radius: 14px 4px;
}
.float-chip.a { top: -12px; right: 16px; }
.float-chip.b { bottom: 16px; left: -12px; animation-delay: -1.6s; background: var(--gold); }
@keyframes bob { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-8px)} }

.stars {
  display: grid; grid-template-columns: repeat(4, 1fr); background: var(--navy); color: #fff;
}
.star { padding: 32px 18px; border-right: 1px solid rgba(255,255,255,0.08); }
.star:nth-child(2) { background: #1c3358; }
.star:nth-child(3) { background: var(--gold); color: var(--navy); }
.star:nth-child(4) { background: var(--rose); }
.star strong { display: block; font-size: clamp(26px, 3.4vw, 38px); font-weight: 900; }
.star span { font-size: 13px; font-weight: 700; }

.clouds { display: grid; gap: 14px; }
.cloud {
  display: grid; grid-template-columns: 140px 1fr; background: var(--foam);
  border: 1.5px solid var(--line); box-shadow: var(--hard); overflow: hidden;
}
.cloud:nth-child(2) { margin-left: 48px; box-shadow: var(--hard-g); }
.cloud:nth-child(3) { margin-right: 48px; }
.cloud-idx {
  display: grid; place-items: center; background: var(--navy); color: var(--gold);
  font-weight: 900; font-size: 28px;
}
.cloud:nth-child(2) .cloud-idx { background: var(--gold); color: var(--navy); }
.cloud:nth-child(3) .cloud-idx { background: var(--rose); color: #fff; }
.cloud-body { padding: 22px 24px; }
.cloud-body h3 { font-size: 20px; margin-bottom: 8px; }
.cloud-body p { color: var(--muted); font-size: 14px; }

.windows {
  display: flex; flex-wrap: wrap; justify-content: center; align-items: flex-end; gap: 16px;
}
.window {
  width: 200px; background: var(--foam); border: 6px solid var(--navy);
  box-shadow: var(--hard); overflow: hidden;
}
.window:nth-child(even) { transform: translateY(-12px); }
.window img { width: 100%; height: auto; display: block; object-fit: contain; image-rendering: auto; }
.window figcaption { padding: 8px 10px; background: var(--navy); color: #fff; font-size: 11px; font-weight: 800; text-align: center; }

.stairs { display: grid; gap: 10px; }
.step {
  display: grid; grid-template-columns: 72px 1fr; background: var(--foam); box-shadow: var(--hard);
}
.step:nth-child(1) { width: 86%; }
.step:nth-child(2) { width: 92%; margin-left: auto; }
.step:nth-child(3) { width: 96%; }
.step:nth-child(4) { width: 100%; }
.num { display: grid; place-items: center; background: #e7f3ff; color: var(--navy); font-weight: 900; }
.step:nth-child(even) .num { background: #f7e7c4; }
.g-body { padding: 16px 18px; }
.g-body h3 { font-size: 16px; margin-bottom: 6px; }
.g-body p { color: var(--muted); font-size: 13.5px; }

.faq-list { max-width: 800px; margin: 0 auto; display: grid; gap: 10px; }
.faq-item { background: var(--foam); border: 1.5px solid var(--line); overflow: hidden; }
.faq-item.is-open { box-shadow: var(--hard-g); border-color: var(--gold); }
.faq-trigger { width: 100%; display: flex; justify-content: space-between; gap: 12px; padding: 16px 18px; text-align: left; font-weight: 700; }
.faq-panel { max-height: 0; overflow: hidden; opacity: 0; transition: 0.3s; padding: 0 18px; }
.faq-item.is-open .faq-panel { max-height: 420px; opacity: 1; padding: 0 18px 16px; }
.faq-panel p { color: var(--muted); font-size: 13.5px; }

.review-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 16px; }
.review-card { padding: 22px; background: var(--foam); box-shadow: var(--hard); }
.review-card:nth-child(3n) { background: var(--navy); color: #fff; }
.review-card p { font-size: 13.5px; margin-bottom: 12px; }
.review-card footer { color: var(--muted); font-size: 12px; }
.review-card:nth-child(3n) footer { color: rgba(255,255,255,0.7); }

.download { padding: 80px 0; background: linear-gradient(160deg, #13233f, #2a4a78 50%, #d46a6a); color: #dce8f8; }
.gate {
  display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 24px; align-items: center;
  padding: 36px; border-radius: 40px 12px; border: 1.5px solid rgba(255,255,255,0.14);
}
.gate h2 { color: #fff; font-size: clamp(26px, 3.6vw, 38px); margin: 8px 0 12px; }
.gate p { margin-bottom: 18px; }
.dl-links { display: flex; flex-wrap: wrap; gap: 10px; }
.lp-brand { text-align: center; }
.lp-brand img { width: 92px; height: 92px; margin: 0 auto 10px; border-radius: 22px; box-shadow: var(--hard-g); object-fit: cover; }
.lp-brand strong { display: block; color: #fff; font-size: 20px; }

.site-footer { padding: 48px 0 24px; background: #0c1524; color: #9aabc0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 24px; margin-bottom: 24px; }
.footer-grid h4 { color: #fff; font-size: 13px; margin-bottom: 10px; }
.footer-brand { display: flex; gap: 10px; align-items: center; margin-bottom: 8px; color: #fff; }
.footer-brand img { width: 34px; height: 34px; border-radius: 9px; object-fit: cover; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 16px; text-align: center; font-size: 12px; }

@media (max-width: 980px) {
  .site-nav, .header-inner > .header-cta { display: none; }
  .mobile-tools { display: flex; }
  .site-nav {
    display: block; position: fixed; top: var(--header-h); left: 0; right: 0;
    background: rgba(243,239,230,0.98); padding: 12px 18px 18px;
    transform: translateY(-120%); opacity: 0; pointer-events: none; transition: 0.3s;
  }
  body.menu-open .site-nav { transform: none; opacity: 1; pointer-events: auto; }
  .site-nav ul { flex-direction: column; }
  .hero-inner, .dd-preview, .cloud, .gate, .footer-grid, .review-grid { grid-template-columns: 1fr; }
  .hero-copy { order: 1; }
  .hero-visual { order: 2; }
  .dd-preview img { width: 160px; max-height: 284px; margin: 0 auto; }
  .cloud:nth-child(n), .step:nth-child(n) { margin: 0; width: 100%; }
  .window:nth-child(n) { transform: none; }
  .stars { grid-template-columns: 1fr 1fr; }
  .float-chip { display: none; }
}
@media (max-width: 560px) {
  .section { padding: 64px 0; }
  .dl-links a { width: 100%; }
}
@media (prefers-reduced-motion: reduce) { .float-chip { animation: none; } }