:root {
  --bg: #f4f5f8;
  --card: #ffffff;
  --ink: #14161a;
  --muted: #7a808c;
  --faint: #b4bac6;
  --border: #e4e6ec;
  --primary: #2b6bff;
  --primary-soft: #e8efff;
  --ink-soft: #eeeff3;
  --danger: #e04b4b;
  --shadow: 0 18px 50px rgba(20, 22, 26, 0.08);
  --radius: 16px;
  --radius-lg: 24px;
  --max: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font: 16px/1.6 "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
img { max-width: 100%; height: auto; display: block; }
button, .btn { font: inherit; }

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

.top {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.brand img { width: 28px; height: 28px; object-fit: contain; border-radius: 7px; }
.nav {
  display: flex;
  align-items: center;
  gap: 22px;
}
.nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 14px;
}
.nav a:hover, .nav a.on { color: var(--ink); }
.menu-btn {
  display: none;
  border: 0;
  background: var(--ink-soft);
  width: 36px;
  height: 36px;
  border-radius: 10px;
  cursor: pointer;
}

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: start;
  padding: 48px 0 32px;
}
.hero > div:first-child { padding-top: 36px; }
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
}
.hero h1 {
  margin: 16px 0 12px;
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.04em;
}
.hero p.lead {
  margin: 0 0 28px;
  max-width: 34em;
  color: var(--muted);
  font-size: 17px;
}
.cta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 650;
  border: 0;
  cursor: pointer;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-ghost { background: var(--card); color: var(--ink); border: 1px solid var(--border); }
.btn[aria-disabled="true"] { opacity: 0.55; pointer-events: none; }
.meta { margin-top: 16px; color: var(--faint); font-size: 13px; }

.phone-wrap { display: flex; justify-content: center; }
.phone {
  width: min(268px, 70vw);
  padding: 0;
  border-radius: 46px;
  overflow: hidden;
  background: #fff;
  box-shadow: var(--shadow), 0 0 0 1px rgba(20, 22, 26, 0.08);
}
.phone img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 804 / 1748;
  object-fit: cover;
  object-position: top;
  background: #fff;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  padding: 8px 0 64px;
}
.stat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
}
.stat b { display: block; font-size: 22px; letter-spacing: -0.03em; }
.stat span { color: var(--muted); font-size: 13px; }

.section { padding: 28px 0 72px; }
.section h2 {
  margin: 0 0 8px;
  font-size: 28px;
  letter-spacing: -0.03em;
}
.section .sub { margin: 0 0 28px; color: var(--muted); max-width: 36em; }

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 22px 20px;
}
.icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--primary-soft);
  color: var(--primary);
  display: grid;
  place-items: center;
  margin-bottom: 14px;
}
.icon svg { width: 18px; height: 18px; }
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.panel h3 { margin: 0 0 10px; font-size: 22px; letter-spacing: -0.03em; }
.panel p, .panel li { color: var(--muted); }
.panel ul { margin: 14px 0 0; padding: 0 0 0 1.1em; }
.panel li { margin: 6px 0; }

.download-band {
  background: #14161a;
  color: #f3f5f8;
  border-radius: 28px;
  padding: 40px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: center;
}
.download-band h2 { color: #fff; }
.download-band .sub { color: #8e96a4; }
.download-band .btn-primary { background: var(--primary); }
.download-band .btn-ghost { background: #222833; color: #f3f5f8; border-color: #2a3140; }

.faq { display: grid; gap: 10px; }
.faq details {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}
.faq summary { cursor: pointer; font-weight: 650; }
.faq p { margin: 10px 0 0; color: var(--muted); font-size: 14px; }

.foot {
  border-top: 1px solid var(--border);
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 13px;
}
.foot-inner {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.foot a { text-decoration: none; }
.foot a:hover { color: var(--ink); }
.foot-links { display: flex; gap: 16px; flex-wrap: wrap; }

.doc { padding: 36px 0 80px; }
.doc-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
}
.doc h1 { margin: 0 0 8px; font-size: 28px; letter-spacing: -0.03em; }
.doc .when { color: var(--muted); margin: 0 0 22px; font-size: 14px; }
.doc .intro { color: var(--ink); margin: 0 0 28px; }
.doc h2 { font-size: 17px; margin: 28px 0 10px; }
.doc p { color: var(--muted); margin: 0 0 10px; }

@media (max-width: 860px) {
  .hero, .split, .download-band, .stats, .grid { grid-template-columns: 1fr; }
  .hero { padding-top: 28px; }
  .hero > div:first-child { padding-top: 8px; }
  .phone { width: min(220px, 58vw); margin: 8px auto 0; }
  .nav {
    display: none;
    position: absolute;
    right: 20px;
    top: 64px;
    flex-direction: column;
    align-items: stretch;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 12px;
    min-width: 180px;
    box-shadow: var(--shadow);
  }
  .nav.open { display: flex; }
  .menu-btn { display: grid; place-items: center; }
  .doc-card { padding: 24px 20px; }
}