:root {
  --bg: #081525;
  --panel: #10233a;
  --gold: #d4a017;
  --gold-2: #f0c14b;
  --text: #e8eef6;
  --dim: #9aa8b8;
  --line: #24384f;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  line-height: 1.8;
}

.shell { width: min(1280px, calc(100% - 40px)); margin: 0 auto; }

.mast {
  background: #06101d;
  border-bottom: 1px solid var(--line);
}
.mast-row {
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 10px;
  padding: 14px 0;
}
.logo {
  color: var(--gold);
  text-decoration: none;
  letter-spacing: 0.18em;
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}
.links { display: flex; gap: 22px; }
.links a {
  color: var(--dim);
  text-decoration: none;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
}
.links a.current { color: var(--gold-2); border-bottom-color: var(--gold); }
.toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--gold);
  color: var(--gold);
  padding: 6px 10px;
}

.banner {
  background:
    linear-gradient(180deg, rgba(8,21,37,0.2), rgba(8,21,37,0.85)),
    radial-gradient(circle at 20% 20%, #1b3b63 0%, transparent 45%),
    #0b1c31;
  padding: 64px 0 48px;
  text-align: center;
}
.banner h1 {
  font-size: 36px;
  letter-spacing: 0.04em;
  margin: 0 0 16px;
  font-weight: 700;
}
.banner p { max-width: 760px; margin: 0 auto 14px; color: var(--dim); }
.cta-row { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; margin-top: 22px; }
.gold-btn, .line-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  padding: 12px 22px;
  font-weight: 700;
}
.gold-btn { background: var(--gold); color: #1a1303; }
.gold-btn:hover { background: var(--gold-2); }
.line-btn { border: 1px solid var(--gold); color: var(--gold-2); }

.block { padding: 42px 0; }
.block h2 {
  font-size: 26px;
  color: var(--gold-2);
  margin: 0 0 14px;
  padding-left: 12px;
  border-left: 4px solid var(--gold);
}
.intro { color: var(--dim); }

.quad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.quad article {
  background: var(--panel);
  padding: 18px;
  border-top: 3px solid var(--gold);
}
.quad h3 { margin: 0 0 8px; font-size: 18px; color: #fff; }

.pair {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 20px;
  background: var(--panel);
  padding: 20px;
  margin: 14px 0;
  border: 1px solid var(--line);
}
.pair .mark {
  display: grid;
  place-items: center;
  background: #17304d;
  color: var(--gold);
  font-size: 28px;
  font-weight: 700;
}

table.sheet {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel);
}
table.sheet th, table.sheet td {
  border: 1px solid var(--line);
  padding: 11px 12px;
  text-align: left;
}
table.sheet th { color: var(--gold-2); background: #0d2138; }

.qbox { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.qbox article {
  background: var(--panel);
  padding: 16px;
  border: 1px solid var(--line);
}
.qbox h3 { margin: 0 0 8px; font-size: 16px; color: var(--gold-2); }
.qbox p { margin: 0; color: var(--dim); }

.foot {
  background: #040910;
  color: #b7c2ce;
  padding: 30px 0;
  border-top: 2px solid var(--gold);
}
.foot a { color: var(--gold-2); }
.ok { color: #fff; margin: 0 0 8px; }
.note { margin: 0; font-size: 13px; }

@media (max-width: 980px) {
  .quad { grid-template-columns: 1fr 1fr; }
  .qbox { grid-template-columns: 1fr; }
  .pair { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .toggle { display: block; position: absolute; right: 16px; top: 16px; }
  .mast { position: relative; }
  .links { display: none; flex-direction: column; }
  .links.open { display: flex; }
  .quad { grid-template-columns: 1fr; }
  .banner h1 { font-size: 28px; }
}