/* web：表格优先，石板灰 + 金色，先对比表再卡片 */
:root {
  --slate: #2F343A;
  --slate-mid: #4A5159;
  --gold: #C9A227;
  --gold-soft: #E3C86A;
  --paper: #F4F4F1;
  --sheet: #FFFffb;
  --ink: #1C1E21;
  --muted: #5A5E63;
  --line: #D5D2C8;
}

* { box-sizing: border-box; }
html { scroll-behavior: auto; }

body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.7;
}

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

.slate-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  background: var(--slate);
  color: #F4F4F1;
  padding: 12px 28px;
}

.slate-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.slate-brand svg { width: 26px; height: 26px; }

.slate-bar nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  font-size: 13px;
}

.slate-bar nav a {
  color: #D0D3D6;
  padding-bottom: 3px;
  border-bottom: 2px solid transparent;
}

.slate-bar nav a:hover,
.slate-bar nav a:focus {
  color: var(--gold-soft);
  border-bottom-color: var(--gold);
}

.gold-hero {
  background: var(--slate-mid);
  color: #F4F4F1;
  padding: 36px 28px 28px;
  border-bottom: 4px solid var(--gold);
}

.gold-hero h1 {
  margin: 0 0 14px;
  font-size: 30px;
  line-height: 1.35;
  max-width: 18em;
}

.gold-hero p {
  margin: 0 0 12px;
  max-width: 48em;
  color: #D8D6D0;
}

.matrix {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 28px 36px;
}

.matrix h2 {
  margin: 26px 0 12px;
  font-size: 22px;
  color: var(--slate);
  line-height: 1.4;
}

.matrix > p {
  margin: 0 0 12px;
  color: var(--muted);
}

table.sheet {
  width: 100%;
  border-collapse: collapse;
  background: var(--sheet);
  font-size: 14px;
  margin: 0 0 16px;
}

table.sheet th,
table.sheet td {
  border: 1px solid var(--line);
  padding: 11px 12px;
  text-align: left;
  vertical-align: top;
}

table.sheet th {
  background: var(--slate);
  color: var(--gold-soft);
  font-weight: 650;
}

table.sheet td:first-child { font-weight: 650; color: var(--slate); }
table.sheet tr:hover td { background: #EFECE3; }

.tile-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
  margin-bottom: 8px;
}

.tile {
  background: var(--sheet);
  border: 1px solid var(--line);
  border-top: 3px solid var(--gold);
  padding: 14px 14px 12px;
}

.tile:hover { border-top-color: var(--slate); }

.tile svg {
  width: 24px;
  height: 24px;
  color: var(--gold);
  display: block;
  margin-bottom: 8px;
}

.tile h3 {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--slate);
}

.tile p {
  margin: 0 0 8px;
  font-size: 14px;
  color: var(--muted);
}

.tile p:last-child { margin-bottom: 0; }

.steps-gold {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0;
  margin: 8px 0 14px;
}

.steps-gold .step {
  background: var(--slate);
  color: #E8E6E0;
  padding: 14px 16px;
  border-right: 1px solid #4A5159;
}

.steps-gold .step:last-child { border-right: 0; }

.steps-gold .step b {
  display: block;
  color: var(--gold);
  font-size: 12px;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}

.steps-gold .step p { margin: 0; font-size: 14px; }

.pair-slate {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.pair-slate article {
  background: var(--sheet);
  border: 1px solid var(--line);
  padding: 14px;
}

.pair-slate h3 {
  margin: 0 0 8px;
  color: var(--slate);
  font-size: 16px;
}

.pair-slate p { margin: 0 0 8px; color: var(--muted); font-size: 14px; }
.pair-slate p:last-child { margin-bottom: 0; }

.faq-slate {
  border: 1px solid var(--line);
  background: var(--sheet);
}

.faq-slate .q {
  border-top: 1px solid var(--line);
  padding: 12px 16px;
}

.faq-slate .q:first-child { border-top: 0; }

.faq-slate h3 {
  margin: 0 0 8px;
  font-size: 15px;
  color: var(--slate);
}

.faq-slate p {
  margin: 0 0 8px;
  font-size: 14px;
  color: var(--muted);
}

.faq-slate p:last-child { margin-bottom: 0; }

.site-foot {
  background: var(--slate);
  color: #C9C6BE;
  padding: 28px 28px 36px;
  font-size: 13px;
  border-top: 3px solid var(--gold);
}

.site-foot p { margin: 0 0 8px; max-width: 52em; }
.site-foot p:last-child { margin-bottom: 0; }

@media (max-width: 900px) {
  .slate-bar { flex-direction: column; align-items: flex-start; }
  .tile-row,
  .steps-gold,
  .pair-slate { grid-template-columns: 1fr; }
  .steps-gold .step { border-right: 0; border-bottom: 1px solid #4A5159; }
}