:root {
  --blue: #1b6bff;
  --blue-dark: #0e4fd6;
  --blue-soft: #e8f1ff;
  --ink: #12203a;
  --muted: #5b6b82;
  --bg: #f4f7fb;
  --card: #ffffff;
  --line: #dde5f0;
  --teal: #0c8a78;
  --orange: #e25a2b;
  --shadow: 0 16px 40px rgba(18, 32, 58, 0.08);
  --radius: 18px;
  --max: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); text-underline-offset: 2px; }
a:hover { color: var(--blue-dark); }
h1, h2, h3 { line-height: 1.25; text-wrap: balance; }
p, li { text-wrap: pretty; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }

.skip {
  position: absolute;
  left: -999px;
  top: 8px;
  background: #fff;
  padding: 8px 12px;
  z-index: 40;
}
.skip:focus { left: 8px; }

.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(--line);
}
.top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
  min-width: 0;
}
.brand img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(27, 107, 255, 0.25);
}
.brand strong { display: block; font-size: 16px; }
.brand small { display: block; color: var(--muted); font-size: 12px; }

.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-burger {
  display: none;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
  font-size: 14px;
}
.nav-burger span {
  width: 16px;
  height: 2px;
  background: var(--ink);
  box-shadow: 0 5px 0 var(--ink), 0 -5px 0 var(--ink);
}

.nav { display: flex; flex-wrap: wrap; gap: 6px 4px; }
.nav a {
  color: var(--ink);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
}
.nav a:hover,
.nav a.is-current {
  background: var(--blue-soft);
  color: var(--blue-dark);
}

.hero {
  background:
    radial-gradient(circle at 12% 20%, #d7e7ff 0, transparent 28%),
    radial-gradient(circle at 88% 10%, #ffe7dc 0, transparent 24%),
    linear-gradient(180deg, #fff 0%, var(--bg) 100%);
  padding: 56px 0 36px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--blue-soft);
  color: var(--blue-dark);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 13px;
  font-weight: 700;
}
.hero h1 {
  margin: 14px 0 12px;
  font-size: clamp(32px, 5vw, 52px);
}
.lead { font-size: 18px; color: var(--muted); margin: 0 0 22px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 700;
  border: 1px solid transparent;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-dark); color: #fff; }
.btn-ghost { background: #fff; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { color: var(--blue-dark); border-color: #c5d4ea; }

.phone {
  width: min(280px, 100%);
  margin: 0 auto;
  background: #111827;
  border-radius: 36px;
  padding: 12px;
  box-shadow: var(--shadow);
}
.phone img { border-radius: 26px; background: #fff; }

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: -8px 0 8px;
}
.stat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px 16px;
}
.stat b { display: block; font-size: 22px; }
.stat span { color: var(--muted); font-size: 13px; }

section { padding: 56px 0; }
.section-head { max-width: 680px; margin-bottom: 28px; }
.section-head h2 { margin: 0 0 8px; font-size: clamp(24px, 3vw, 34px); }
.section-head p { margin: 0; color: var(--muted); }

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.cards-2 { grid-template-columns: 1fr 1fr; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 20px;
  box-shadow: 0 1px 0 rgba(18, 32, 58, 0.03);
}
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); }
.tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 2px 8px;
  border-radius: 999px;
  background: #e8f7f3;
  color: var(--teal);
  font-size: 12px;
  font-weight: 700;
}
.tag-orange { background: #ffece4; color: var(--orange); }

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
}
.split.reverse { direction: rtl; }
.split.reverse > * { direction: ltr; }
.shot-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.shot {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 12px 12px 16px;
  text-decoration: none;
  color: inherit;
}
.shot img {
  border-radius: 16px;
  border: 1px solid var(--line);
}
.shot h3 { margin: 12px 8px 4px; font-size: 16px; }
.shot p { margin: 0 8px; color: var(--muted); font-size: 13px; }

.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.step {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
}
.step em {
  display: inline-flex;
  width: 28px;
  height: 28px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  font-style: normal;
  font-weight: 800;
  font-size: 13px;
}
.books { display: flex; flex-wrap: wrap; gap: 8px; }
.book {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 14px;
  font-weight: 600;
}

.prose { max-width: 760px; }
.prose h1 { margin-top: 0; }
.prose h2 { margin-top: 36px; }
.table-wrap { overflow-x: auto; }
table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}
th, td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th { background: #f7f9fc; font-size: 13px; color: var(--muted); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.page-hero {
  padding: 36px 0 8px;
}
.page-hero h1 { margin: 8px 0; font-size: clamp(28px, 4vw, 40px); }
.muted { color: var(--muted); }

.foot {
  background: #0f1728;
  color: #d7deea;
  padding: 48px 0 24px;
  margin-top: 24px;
}
.foot a { color: #d7e8ff; }
.foot h2 { color: #fff; font-size: 15px; margin: 0 0 12px; }
.foot p, .foot li { font-size: 14px; }
.foot ul { list-style: none; padding: 0; margin: 0; }
.foot li { margin: 0 0 8px; }
.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr 1.2fr;
  gap: 28px;
}
.foot-bar {
  margin-top: 32px;
  padding-top: 18px;
  border-top: 1px solid #2a3548;
  font-size: 13px;
  color: #9aa6b8;
}
.beian { white-space: nowrap; }

@media (max-width: 920px) {
  .hero-grid, .split, .split.reverse, .cards, .stats, .steps, .shot-row, .foot-grid, .contact-grid {
    grid-template-columns: 1fr;
  }
  .shot-row { grid-template-columns: repeat(2, 1fr); }
  .nav-burger { display: inline-flex; }
  .nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 72px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 12px 20px 16px;
    flex-direction: column;
  }
  .nav-toggle:checked ~ .nav { display: flex; }
  .top-inner { position: relative; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}