:root {
  --ink: #18181b;
  --gold: #a16207;
  --gold-2: #fef3c7;
  --linen: #faf8f5;
  --card: #fffdf9;
  --line: #e7e0d4;
  --mute: #44403c;
  --max: 1220px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--linen);
  color: var(--ink);
  font-family: "Palatino Linotype", "Songti SC", "SimSun", "Microsoft YaHei", serif;
  line-height: 1.68;
}

.ink-top {
  background: var(--ink);
  color: #fafaf9;
}
.ink-row {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.9rem 1.2rem;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}
.sig {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  color: #fafaf9;
  text-decoration: none;
  font-weight: 700;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  letter-spacing: 0.04em;
}
.rail {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem 0.85rem;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}
.rail a {
  color: #d6d3d1;
  text-decoration: none;
  font-size: 0.82rem;
}
.rail a:hover { color: #fde68a; }

.hero-work {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.3rem 1.2rem 1.4rem;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.8rem;
}
.hero-work h1 {
  margin: 0 0 0.85rem;
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  line-height: 1.25;
}
.hero-work p {
  margin: 0 0 0.7rem;
  color: var(--mute);
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  max-width: 40rem;
}
.file-mosaic {
  position: relative;
  min-height: 220px;
}
.tile {
  position: absolute;
  width: 46%;
  background: var(--card);
  border: 1px solid var(--line);
  padding: 0.85rem;
  box-shadow: 6px 6px 0 var(--gold-2);
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 0.82rem;
}
.tile svg { color: var(--gold); display: block; margin-bottom: 0.35rem; }
.tile b { display: block; margin-bottom: 0.2rem; }
.t1 { top: 0; left: 0; }
.t2 { top: 12%; right: 0; }
.t3 { bottom: 8%; left: 10%; }
.t4 { bottom: 0; right: 8%; }

.sheet {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1.2rem;
}
.sheet h2 {
  margin: 0 0 0.7rem;
  font-size: 1.38rem;
}
.note {
  margin: 0 0 1.15rem;
  color: var(--mute);
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  max-width: 48rem;
}

.outbox {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}
.outbox article {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1rem 0.9rem 1.05rem;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}
.goldbox {
  width: 44px;
  height: 44px;
  background: var(--gold-2);
  color: var(--gold);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.55rem;
}
.outbox h3 { margin: 0 0 0.4rem; font-size: 0.98rem; }
.outbox p { margin: 0 0 0.4rem; color: var(--mute); font-size: 0.88rem; }

.phoneback {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid var(--line);
  background: var(--card);
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}
.phoneback article {
  padding: 1.15rem 1.2rem;
}
.phoneback article:first-child {
  border-right: 6px solid var(--gold);
}
.phoneback h3 { margin: 0 0 0.45rem; }
.phoneback p { margin: 0 0 0.5rem; color: var(--mute); }

.preview-sheet {
  width: 100%;
  border-collapse: collapse;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 0.9rem;
  background: var(--card);
}
.preview-sheet th,
.preview-sheet td {
  border-bottom: 1px solid var(--line);
  padding: 0.7rem 0.55rem;
  text-align: left;
  vertical-align: top;
}
.preview-sheet th {
  color: var(--gold);
  font-weight: 700;
  border-bottom: 2px solid var(--gold);
}

.drop-spine {
  border-left: 3px solid var(--gold);
  padding-left: 0;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}
.drop-spine article {
  position: relative;
  padding: 0 0 1.2rem 1.6rem;
}
.drop-spine article::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 0.35rem;
  width: 11px;
  height: 11px;
  background: var(--gold);
  border-radius: 50%;
}
.drop-spine h3 { margin: 0 0 0.35rem; font-size: 1rem; }
.drop-spine p { margin: 0 0 0.4rem; color: var(--mute); }

.after-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}
.after-pair article {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1.1rem;
}
.after-pair h3 { margin: 0 0 0.45rem; }
.after-pair p { margin: 0 0 0.45rem; color: var(--mute); }

.fail-trio {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.75rem;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}
.fail-trio article {
  background: var(--ink);
  color: #e7e5e4;
  padding: 1rem 1.05rem;
}
.fail-trio h3 { margin: 0 0 0.4rem; color: #fde68a; font-size: 1rem; }
.fail-trio p { margin: 0 0 0.4rem; color: #d6d3d1; font-size: 0.88rem; }

.file-limit {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.65rem;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}
.file-limit article {
  background: var(--gold-2);
  padding: 0.9rem;
}
.file-limit h3 { margin: 0 0 0.35rem; font-size: 0.95rem; }
.file-limit p { margin: 0; color: var(--mute); font-size: 0.86rem; }

.faq-cols {
  columns: 2;
  column-gap: 1rem;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}
.faq-cols details {
  break-inside: avoid;
  background: var(--card);
  border: 1px solid var(--line);
  margin-bottom: 0.6rem;
}
.faq-cols summary {
  cursor: pointer;
  padding: 0.75rem 0.9rem;
  font-weight: 700;
}
.faq-cols p {
  margin: 0;
  padding: 0 0.9rem 0.85rem;
  color: var(--mute);
}

.base {
  background: #111113;
  color: #a8a29e;
  padding: 1.5rem 1.2rem 1.9rem;
  font-size: 0.86rem;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}
.base div { max-width: var(--max); margin: 0 auto; }
.base p { margin: 0 0 0.4rem; }
.base .legal { color: #78716c; margin-top: 0.55rem; }

@media (max-width: 920px) {
  .hero-work,
  .outbox,
  .phoneback,
  .after-pair,
  .fail-trio,
  .file-limit { grid-template-columns: 1fr; }
  .phoneback article:first-child { border-right: 0; border-bottom: 6px solid var(--gold); }
  .file-mosaic { min-height: 280px; }
  .faq-cols { columns: 1; }
  .ink-row { flex-direction: column; }
}