/* 第2套：左侧轨 + 深色功能条，藏青/青 */
:root {
  --bg: #0b1220;
  --panel: #141c2e;
  --ink: #e8eef8;
  --dim: #93a0b8;
  --line: #2a3650;
  --cyan: #3ecfcf;
  --warn: #f0c14b;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  line-height: 1.75;
  font-size: 16px;
}

.rail {
  position: fixed;
  inset: 0 auto 0 0;
  width: 228px;
  background: #070c16;
  border-right: 1px solid var(--line);
  padding: 28px 20px;
  z-index: 10;
}
.brand {
  display: block;
  color: var(--cyan);
  text-decoration: none;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: 36px;
}
.nav { display: flex; flex-direction: column; gap: 8px; }
.nav a {
  color: var(--dim);
  text-decoration: none;
  padding: 10px 12px;
  border-left: 3px solid transparent;
}
.nav a.active,
.nav a:hover {
  color: #fff;
  background: var(--panel);
  border-left-color: var(--cyan);
}

.main { margin-left: 228px; }
.hero {
  padding: 48px 48px 36px;
  background:
    radial-gradient(800px 280px at 80% 0%, rgba(62, 207, 207, 0.16), transparent 60%),
    var(--bg);
}
.hero h1 {
  font-size: 34px;
  line-height: 1.4;
  margin: 0 0 16px;
  max-width: 860px;
}
.hero p { max-width: 760px; color: var(--dim); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  text-decoration: none;
  font-size: 14px;
}
.btn-main { background: var(--cyan); color: #062222; font-weight: 700; }
.btn-ghost { border: 1px solid var(--cyan); color: var(--cyan); }
.btn-win { background: #fff; color: #0b1220; font-weight: 700; }

.wrap { padding: 8px 48px 40px; max-width: 1180px; }
.block { margin: 36px 0; }
.block h2 {
  font-size: 22px;
  margin: 0 0 14px;
  color: #fff;
}
.block h2 span {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--cyan);
  margin-right: 10px;
  vertical-align: middle;
}

.feat-stack { display: flex; flex-direction: column; gap: 14px; }
.feat-row {
  display: grid;
  grid-template-columns: 72px 1fr 220px;
  gap: 18px;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 16px 18px;
}
.feat-row p { margin: 6px 0 0; color: var(--dim); }
.feat-row h3 { margin: 0; font-size: 17px; }
.icon { width: 32px; height: 32px; color: var(--cyan); }
.tag {
  justify-self: end;
  color: var(--warn);
  font-size: 13px;
}

.matrix {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.matrix th, .matrix td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
}
.matrix th { background: #1b2740; }
.matrix td { background: #10182a; color: var(--dim); }

.faq-item {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 14px 16px;
  margin-bottom: 10px;
}
.faq-item h3 { margin: 0 0 8px; font-size: 16px; }
.faq-item p { margin: 0; color: var(--dim); }

.dl-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0; }
.dl-row a {
  color: #062222;
  background: var(--cyan);
  text-decoration: none;
  padding: 8px 12px;
  font-size: 13px;
}

.cta-band {
  margin: 28px 0;
  padding: 20px 22px;
  border: 1px dashed var(--cyan);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.site-footer {
  margin-left: 228px;
  border-top: 1px solid var(--line);
  padding: 24px 48px 32px;
  color: var(--dim);
  font-size: 13px;
}
.foot-nav { display: flex; gap: 16px; margin-bottom: 10px; }
.foot-nav a { color: #c9d4e8; text-decoration: none; }
.foot-nav a.active { color: var(--cyan); }
.safe { color: var(--warn); }

@media (max-width: 980px) {
  .rail { position: relative; width: auto; inset: auto; }
  .main, .site-footer { margin-left: 0; }
  .feat-row { grid-template-columns: 1fr; }
  .hero, .wrap, .site-footer { padding-left: 20px; padding-right: 20px; }
}