:root {
  --ink: #07111f;
  --ink-2: #1c3148;
  --blue: #2b6de8;
  --blue-d: #143f9a;
  --cyan: #1493c7;
  --gold: #b8862a;
  --paper: #f4f7fb;
  --card: #ffffff;
  --line: #d7e1ee;
  --sub: #5c6b7e;
  --slow: #c2452d;
  --fast: #0d8a52;
  --shadow: 0 24px 60px rgba(7, 17, 31, 0.16);
  --serif: "Noto Serif SC", "Songti SC", "STSong", serif;
  --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); border: 0;
}

.nav {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 28px;
  padding: 14px 6vw;
  background: rgba(244, 247, 251, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(215, 225, 238, 0.9);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand strong { display: block; font-size: 18px; letter-spacing: 0.12em; }
.brand em { display: block; font-style: normal; font-size: 12px; color: var(--sub); letter-spacing: 0.18em; }
.logo {
  width: 52px; height: 52px; border-radius: 50%;
  object-fit: cover; flex-shrink: 0;
}
.nav-links { display: flex; gap: 22px; margin-left: auto; }
.nav-links a { text-decoration: none; color: var(--ink-2); font-size: 14px; font-weight: 500; }
.nav-links a:hover { color: var(--blue); }
.nav-cta, .btn {
  display: inline-flex; align-items: center; justify-content: center;
  text-decoration: none; border-radius: 999px; font-weight: 700;
}
.nav-cta {
  background: var(--ink); color: #fff; padding: 8px 16px; font-size: 14px;
}
.nav-toggle { display: none; margin-left: auto; border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 6px 12px; }

.hero {
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 48px;
  align-items: center; padding: 54px 6vw 36px;
}
.eyebrow, .kicker {
  margin: 0 0 10px; color: var(--blue-d); font-weight: 700;
  letter-spacing: 0.16em; font-size: 13px;
}
.hero h1 {
  margin: 0; font-family: var(--serif); font-weight: 700;
  font-size: clamp(48px, 6vw, 84px); line-height: 1.05; letter-spacing: 0.04em;
}
.lead { font-size: 18px; color: var(--ink-2); max-width: 38em; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 22px 0; }
.btn { padding: 12px 20px; border: 0; cursor: pointer; font-family: inherit; font-size: 15px; }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-d); }
.btn-ghost { background: transparent; color: var(--ink); box-shadow: inset 0 0 0 1.5px var(--ink); }
.hero-facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; padding: 0; margin: 28px 0 0; list-style: none; }
.hero-facts li { border-top: 2px solid var(--ink); padding-top: 8px; }
.hero-facts b { display: block; font-size: 15px; }
.hero-facts span { color: var(--sub); font-size: 13px; }
.hero-visual { position: relative; }
.hero-visual img { width: 100%; height: 620px; object-fit: cover; border-radius: 28px 28px 80px 28px; }
.float-card {
  position: absolute; left: -36px; bottom: 28px; width: min(340px, 80%);
  background: rgba(255,255,255,0.96); border-radius: 18px; padding: 16px 16px 12px;
  box-shadow: var(--shadow);
}
.float-card header { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.float-card header span { color: var(--sub); font-size: 12px; }
.float-card header strong { font-family: var(--serif); font-size: 36px; letter-spacing: 0.02em; }
.float-card dl { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 8px 0; }
.float-card dt { color: var(--sub); font-size: 12px; }
.float-card dd { margin: 0; font-weight: 700; }
.float-card .slow { color: var(--slow); }
.float-card p, .fine { color: var(--sub); font-size: 12px; margin: 0; }

.questions { padding: 10px 6vw 20px; }
.questions ol {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px;
  margin: 0; padding: 0; list-style: none; counter-reset: q;
}
.questions li {
  counter-increment: q; background: var(--ink); color: #e8eef8;
  border-radius: 18px; min-height: 150px; padding: 18px 18px 18px 18px;
  font-family: var(--serif); font-size: 20px; line-height: 1.45;
}
.questions li::before {
  content: counter(q, decimal-leading-zero); display: block;
  color: #7eb6ff; font-family: var(--sans); font-size: 12px; letter-spacing: 0.14em; margin-bottom: 10px;
}

.panel {
  display: grid; grid-template-columns: 0.86fr 1.14fr; gap: 42px;
  align-items: center; padding: 72px 6vw;
}
.panel-flip { grid-template-columns: 1.14fr 0.86fr; }
.panel-flip .panel-photo { order: 2; }
.panel-photo img { width: 100%; height: 560px; object-fit: cover; border-radius: 24px; }
.panel h2, .section-head h2, .ai h2, .close h2, .index h2 {
  font-family: var(--serif); font-weight: 700; letter-spacing: 0.03em;
  font-size: clamp(32px, 4vw, 48px); line-height: 1.2; margin: 0 0 12px;
}
.feature-list { list-style: none; padding: 0; margin: 22px 0 0; }
.feature-list li { padding: 12px 0; border-top: 1px solid var(--line); }
.feature-list strong { display: block; }
.feature-list span { color: var(--ink-2); }

.data { padding: 20px 6vw 72px; }
.section-head { max-width: 760px; margin-bottom: 28px; }
.section-head.light { color: #f4f7fb; }
.data-grid { display: grid; grid-template-columns: 1.4fr 0.8fr; gap: 16px; }
.data-card {
  background: var(--card); border-radius: 22px; padding: 22px;
  box-shadow: 0 1px 0 rgba(7,17,31,0.04);
}
.data-card-wide { grid-column: 1 / -1; display: grid; grid-template-columns: 280px 1fr; gap: 22px; align-items: center; }
.data-card-wide img { height: 100%; min-height: 240px; object-fit: cover; border-radius: 16px; }
.data-card h3 { margin: 0 0 8px; font-size: 22px; }
.sheet { width: 100%; border-collapse: collapse; margin-top: 14px; font-variant-numeric: tabular-nums; }
.sheet caption { text-align: left; color: var(--sub); font-size: 12px; margin-bottom: 6px; }
.sheet th, .sheet td { border-bottom: 1px solid var(--line); padding: 8px 6px; text-align: right; }
.sheet th:first-child, .sheet td:first-child { text-align: left; }
.sheet thead th { color: var(--sub); font-weight: 500; font-size: 13px; }
.sheet .me { background: #eaf1ff; color: var(--blue-d); font-weight: 700; }
.rank-list { list-style: none; padding: 0; margin: 0 0 12px; }
.rank-list li { display: grid; grid-template-columns: 72px 1fr; gap: 4px 10px; padding: 10px 0; border-top: 1px solid var(--line); }
.rank-list span { color: var(--gold); font-weight: 700; }
.rank-list small { grid-column: 2; color: var(--sub); }
.grades { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.lv { color: #fff; border-radius: 999px; padding: 4px 10px; font-size: 13px; font-weight: 700; }
.intl { background: #5b4cdb; }
.elite { background: #d6453d; }
.l1 { background: #e07a2f; }
.l2 { background: #2b6de8; }
.l3 { background: #7d8b9a; }

.ai {
  margin: 0 6vw 72px; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 28px;
  background: #fff; border-radius: 28px; overflow: hidden;
}
.ai-copy { padding: 36px 8px 36px 36px; }
.ai-kinds { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 18px 0; }
.ai-kinds article { background: var(--paper); border-radius: 14px; padding: 12px; }
.ai-kinds h3 { margin: 0 0 6px; font-size: 16px; }
.ai-kinds p { margin: 0; color: var(--ink-2); font-size: 14px; }
.ai-figure { margin: 0; position: relative; }
.ai-figure img { width: 100%; height: 100%; min-height: 420px; object-fit: cover; }
.ai-figure figcaption {
  position: absolute; left: 16px; right: 16px; bottom: 16px;
  background: rgba(7,17,31,0.88); color: #fff; border-radius: 16px; padding: 14px 16px;
}
.ai-figure strong { display: block; margin-bottom: 4px; }
.ai .fine { margin-top: 8px; }

.voice {
  margin: 0 0 72px; padding: 64px 6vw;
  background:
    linear-gradient(180deg, rgba(7,17,31,0.55), rgba(7,17,31,0.78)),
    url("../images/team.jpg") center/cover no-repeat;
  color: #f4f7fb;
}
.voice .fine { color: #c9d5e6; }
.voice-stage { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 22px; align-items: start; }
.voice-script, .voice-sheet { background: rgba(255,255,255,0.96); color: var(--ink); border-radius: 20px; padding: 20px; }
.script-label { margin: 0 0 8px; font-size: 13px; color: var(--sub); }
.chip {
  border: 1px solid var(--line); background: #fff; border-radius: 999px;
  padding: 6px 12px; margin: 0 8px 8px 0; cursor: pointer; font-family: inherit;
}
.chip.on { background: var(--ink); color: #fff; border-color: var(--ink); }
.script-line { font-family: var(--serif); font-size: 26px; line-height: 1.45; min-height: 3.2em; }
.voice-sheet header { display: flex; justify-content: space-between; font-size: 13px; color: var(--sub); margin-bottom: 8px; }
.voice-sheet table { width: 100%; border-collapse: collapse; }
.voice-sheet th, .voice-sheet td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); }
.voice-sheet td.filled { font-weight: 700; color: var(--blue-d); background: #eaf1ff; }

.howto { padding: 10px 6vw 48px; }
.howto-switch { display: flex; gap: 8px; margin-bottom: 18px; }
.howto-switch button {
  border: 0; background: #e6edf6; border-radius: 999px; padding: 10px 16px;
  font-family: inherit; font-weight: 700; cursor: pointer;
}
.howto-switch button.on { background: var(--ink); color: #fff; }
.steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; padding: 0; margin: 0; list-style: none; counter-reset: s; }
.steps li { background: #fff; border-radius: 18px; padding: 16px; min-height: 180px; counter-increment: s; }
.steps li::before { content: counter(s); display: block; font-family: var(--serif); font-size: 28px; color: var(--blue); }
.steps b { display: block; margin-bottom: 6px; }
.steps span { color: var(--ink-2); font-size: 14px; }
.hidden { display: none; }

.index { padding: 10px 6vw 72px; }
.index-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.index-grid > div { background: #fff; border-radius: 22px; padding: 22px 26px; }
.index-grid h3 { margin-top: 0; }
.index-grid ul { margin: 0; padding-left: 18px; }
.index-grid li { margin: 6px 0; }

.close {
  margin: 0 6vw 48px; display: grid; grid-template-columns: 1.1fr 0.9fr;
  background: var(--ink); color: #fff; border-radius: 28px; overflow: hidden; min-height: 280px;
}
.close img { width: 100%; height: 100%; object-fit: cover; min-height: 280px; }
.close div { padding: 36px; display: flex; flex-direction: column; justify-content: center; }
.close p { color: #c9d5e6; }
.close .btn { align-self: flex-start; }

.foot { padding: 10px 6vw 36px; color: var(--sub); font-size: 13px; }
.foot-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.foot .logo { width: 64px; height: 64px; }
.foot strong { color: var(--ink); display: block; font-size: 15px; }
.foot .beian { margin-top: 16px; text-align: center; font-size: 14px; color: #666; }
.foot .beian a { color: #666; text-decoration: none; }
.foot .beian a:hover { text-decoration: underline; }

@media (max-width: 980px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; gap: 0; background: #fff; border-bottom: 1px solid var(--line); padding: 8px 6vw 16px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px 0; }
  .nav-cta { display: none; }
  .hero, .panel, .panel-flip, .ai, .voice-stage, .close, .data-card-wide, .index-grid {
    grid-template-columns: 1fr;
  }
  .panel-flip .panel-photo { order: 0; }
  .hero-visual img, .panel-photo img { height: 360px; }
  .float-card { left: 12px; right: 12px; width: auto; }
  .questions ol, .steps, .ai-kinds, .hero-facts { grid-template-columns: 1fr 1fr; }
  .ai-copy { padding: 24px; }
  .data-card-wide img { min-height: 180px; height: 200px; }
}

@media (max-width: 640px) {
  .questions ol, .steps, .ai-kinds, .hero-facts, .float-card dl { grid-template-columns: 1fr; }
  .hero { padding-top: 28px; }
  .script-line { font-size: 22px; }
}