:root {
  --paper: #f5f3ee;
  --sheet: #fffefa;
  --ink: #221e17;
  --muted: #71695c;
  --line: #ddd7c9;
  --seal: #b23b24;
  --green: #3d6b4f;
  --serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Consolas, monospace;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  min-width: 320px;
  margin: 0;
  background: var(--paper);
}

a { color: inherit; }

.site-header,
.site-footer,
#demo-index {
  width: min(1020px, calc(100% - 48px));
  margin-inline: auto;
}

/* ---------- 页眉 ---------- */

.site-header {
  height: 88px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--ink);
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
}

.wordmark strong { font-size: 15px; font-weight: 700; letter-spacing: 0.02em; }
.wordmark small { color: var(--muted); font-size: 12px; }

.availability {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.availability i,
.case-status i {
  width: 7px;
  height: 7px;
  background: var(--green);
}

/* ---------- 开场 ---------- */

.hero {
  position: relative;
  padding: 88px 0 80px;
}

.domain {
  margin: 0 0 30px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

h1 {
  max-width: 720px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(38px, 5.4vw, 60px);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: 0.01em;
}

.seal {
  position: absolute;
  top: 118px;
  right: 4px;
  width: 88px;
  height: 88px;
  padding: 10px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  place-items: center;
  color: #f8efe4;
  background: var(--seal);
  border-radius: 5px 8px 6px 9px / 8px 5px 9px 6px;
  box-shadow: inset 0 0 0 2px rgba(248, 239, 228, 0.5);
  transform: rotate(-3deg);
  font-family: var(--serif);
  font-size: 27px;
  font-weight: 700;
  line-height: 1;
  user-select: none;
}

.intro {
  max-width: 560px;
  margin: 40px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 2;
}

/* ---------- 案例条目 ---------- */

.cases { padding-bottom: 24px; }

.case {
  padding: 42px 18px 48px;
  margin-inline: -18px;
  border-top: 1px solid var(--line);
  transition: background 200ms ease;
}

.case:hover { background: rgba(255, 254, 250, 0.75); }

.case-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 26px;
}

.case-no {
  margin: 0;
  font-family: var(--serif);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.3em;
}

.case-status {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 0;
  color: var(--green);
  font-size: 12px;
}

.case-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
  gap: 60px;
  align-items: start;
}

/* 文档式预览 */

.case-doc { min-width: 0; }

.doc-sheet {
  padding: 24px 26px 20px;
  border: 1px solid var(--line);
  background: var(--sheet);
}

.doc-title {
  margin: 0 0 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ink);
  font-family: var(--serif);
  font-size: 14px;
  font-weight: 700;
}

.doc-sheet dl { margin: 0; }

.doc-sheet dl > div {
  display: grid;
  grid-template-columns: 1.35fr 0.75fr 0.95fr auto;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 12.5px;
  align-items: baseline;
}

.doc-sheet dl > div:last-child { border-bottom: 0; }

.doc-sheet dt { font-weight: 600; }
.doc-sheet dd { margin: 0; color: var(--muted); }

.doc-sheet dd.amount {
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.doc-sheet dd.ok { color: var(--green); text-align: right; }
.doc-sheet dd.wait { color: var(--seal); text-align: right; }

.checklist {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12.5px;
}

.checklist li {
  position: relative;
  padding: 8px 0 8px 26px;
  border-bottom: 1px dashed var(--line);
  color: var(--muted);
}

.checklist li:last-child { border-bottom: 0; }

.checklist li::before {
  position: absolute;
  left: 2px;
  top: 8px;
  color: var(--muted);
  content: "○";
}

.checklist li.done { color: var(--ink); }
.checklist li.done::before { color: var(--green); content: "✓"; font-weight: 700; }
.checklist li.doing { color: var(--ink); }
.checklist li.doing::before { color: var(--seal); content: "→"; }

.doc-ask {
  margin: 16px 0 0;
  padding: 10px 0 0 14px;
  border-top: 1px solid var(--line);
  border-left: 2px solid var(--line);
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.7;
}

.doc-caption {
  margin: 12px 2px 0;
  color: var(--muted);
  font-size: 11px;
}

/* 条目信息 */

.case-info { min-width: 0; }

.case-field {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.case-info h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(24px, 2.6vw, 31px);
  font-weight: 700;
  line-height: 1.3;
}

.case-desc {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.9;
}

.case-points {
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  color: var(--muted);
  font-size: 12.5px;
}

.case-points li { display: inline-flex; align-items: center; }
.case-points li + li::before {
  content: "·";
  margin: 0 10px;
  color: var(--line);
}

.enter-link {
  margin-top: 26px;
  padding-top: 16px;
  display: flex;
  align-items: baseline;
  gap: 14px;
  border-top: 1px solid var(--line);
  text-decoration: none;
}

.enter-link span { font-size: 14px; font-weight: 700; }
.enter-link code { color: var(--muted); font-family: var(--mono); font-size: 12px; }
.enter-link b { font-weight: 400; transition: transform 180ms ease; }

.enter-link:hover { color: var(--seal); }
.enter-link:hover code { color: var(--seal); }
.enter-link:hover b { transform: translateX(4px); }

/* ---------- 页脚 ---------- */

.site-footer {
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--ink);
  color: var(--muted);
  font-size: 12px;
}

.site-footer strong { color: var(--ink); }

/* ---------- 可访问性与响应式 ---------- */

a:focus-visible {
  outline: 2px solid var(--seal);
  outline-offset: 4px;
}

@media (max-width: 860px) {
  .seal { position: static; margin-top: 36px; transform: rotate(-3deg); }
  .case-main { grid-template-columns: 1fr; gap: 34px; }
  .case-doc { max-width: 520px; }
}

@media (max-width: 560px) {
  .site-header, .site-footer, #demo-index { width: min(100% - 32px, 1020px); }
  .site-header { height: 72px; }
  .availability { font-size: 0; gap: 7px; }
  .availability::after { content: "2 套在线"; font-size: 12px; }
  .hero { padding: 60px 0 52px; }
  h1 { font-size: clamp(34px, 9.5vw, 44px); }
  .intro { margin-top: 30px; font-size: 14px; }
  .case { padding: 34px 14px 40px; margin-inline: -14px; }
  .doc-sheet { padding: 20px 18px 16px; }
  .doc-sheet dl > div { grid-template-columns: 1.2fr 0.8fr auto; }
  .doc-sheet dl > div dd:nth-child(2) { display: none; }
  .site-footer { align-items: flex-start; flex-direction: column; justify-content: center; padding: 24px 0; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}