:root {
  --bg: #101014;
  --bg2: #17171c;
  --line: #26262c;
  --fg: #e8e6e3;
  --dim: #8b8884;
  --dim2: #5f5d5a;
  --accent: #6f8fa8;
  --accent2: #8fc0e0;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.75 -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ---------- 导航 ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px 28px;
  background: rgba(16, 16, 20, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.brand .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent2);
  box-shadow: 0 0 12px rgba(143, 192, 224, 0.6);
}

.nav nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav nav a {
  color: var(--dim);
  font-size: 14px;
  transition: color 0.15s;
}

.nav nav a:hover { color: var(--fg); }

/* ---------- 按钮 ---------- */

.btn {
  display: inline-block;
  padding: 9px 20px;
  border-radius: 9px;
  background: var(--accent);
  color: #0d1216;
  font-weight: 500;
  font-size: 14px;
  border: 1px solid transparent;
  transition: filter 0.15s, background 0.15s;
}

.btn:hover { filter: brightness(1.12); }

.btn.ghost {
  background: transparent;
  color: var(--fg);
  border-color: var(--line);
}

.btn.ghost:hover { background: var(--bg2); }

.btn.small { padding: 6px 14px; font-size: 13px; }

/* ---------- 首屏 ---------- */

.hero {
  max-width: 880px;
  margin: 0 auto;
  padding: 96px 28px 72px;
  text-align: center;
}

.eyebrow {
  color: var(--dim2);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin: 0 0 20px;
}

.hero h1 {
  font-size: clamp(30px, 5.4vw, 54px);
  line-height: 1.28;
  font-weight: 600;
  margin: 0 0 22px;
  letter-spacing: -0.01em;
}

.lead {
  color: #c9c6c2;
  font-size: 17px;
  max-width: 620px;
  margin: 0 auto 30px;
}

.lead.small { font-size: 14.5px; color: var(--dim); }

.cta {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.hint {
  color: var(--dim2);
  font-size: 12.5px;
  margin-top: 18px;
}

/* ---------- 区块 ---------- */

.block {
  max-width: 940px;
  margin: 0 auto;
  padding: 64px 28px;
  border-top: 1px solid var(--line);
}

.block h2 {
  font-size: 13px;
  font-weight: 500;
  color: var(--dim2);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin: 0 0 28px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.cards article {
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 22px;
}

.cards h3 {
  font-size: 15px;
  font-weight: 500;
  margin: 0 0 8px;
}

.cards p { color: var(--dim); font-size: 14px; margin: 0; }

.feats {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 4px 32px;
}

.feats li {
  display: flex;
  flex-direction: column;
  padding: 14px 0;
  border-bottom: 1px solid #1d1d22;
}

.feats b { font-weight: 500; font-size: 15px; }
.feats span { color: var(--dim); font-size: 13.5px; margin-top: 3px; }

blockquote {
  margin: 0 0 18px;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--accent);
  font-size: 22px;
  font-family: "Songti SC", "SimSun", serif;
}

.layers {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
  margin-top: 26px;
}

.layers div {
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
}

.layers b { display: block; font-weight: 500; font-size: 14px; }
.layers span { display: block; color: var(--dim2); font-size: 12px; margin-top: 3px; }

/* ---------- 价格 ---------- */

.price {
  width: 100%;
  max-width: 560px;
  border-collapse: collapse;
  font-size: 14px;
  margin-bottom: 8px;
}

.price th,
.price td {
  text-align: left;
  padding: 10px 0;
  border-bottom: 1px solid #1d1d22;
}

.price th { color: var(--dim2); font-weight: 400; font-size: 12px; letter-spacing: 0.1em; }
.price td:last-child { text-align: right; color: #c9c6c2; font-variant-numeric: tabular-nums; }
.price .off { color: var(--accent2); }

.cta-block { text-align: center; }

/* ---------- 页脚 ---------- */

footer {
  border-top: 1px solid var(--line);
  padding: 28px;
  text-align: center;
  color: var(--dim2);
  font-size: 12.5px;
}

footer a { color: var(--dim); }
footer a:hover { color: var(--fg); }
.sep { margin: 0 10px; }

@media (max-width: 640px) {
  .nav { padding: 12px 16px; gap: 12px; }
  .nav nav { gap: 14px; }
  .nav nav a:not(.btn) { display: none; }
  .hero { padding: 64px 20px 48px; }
  .block { padding: 48px 20px; }
}