:root {
  --doc-bg: #fdfaf3;
  --doc-surface: #ffffff;
  --doc-text: #1c1917;
  --doc-muted: #57534e;
  --doc-border: #ece9e2;
  --doc-accent: #629dc9;
  --doc-max: 920px;
  --font-serif: "SimSun", "宋体", "Songti SC", "STSong", serif;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--doc-text);
  background: var(--doc-bg);
  line-height: 1.65;
}

.doc-main {
  max-width: var(--doc-max);
  margin: 0 auto;
  padding: 32px 20px 64px;
}

.doc-main h1 {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 36px);
  margin: 0 0 12px;
}

.doc-lead {
  color: var(--doc-muted);
  font-size: 16px;
  margin: 0 0 28px;
}

.doc-conversation {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.doc-message {
  background: var(--doc-surface);
  border: 1px solid var(--doc-border);
  border-radius: 16px;
  padding: 20px 22px;
}

.doc-message--user {
  border-color: #e2e8f0;
  background: #f8fafc;
}

.doc-message-label {
  font-size: 13px;
  color: #8e8e8e;
  margin: 0 0 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.doc-markdown :is(h1, h2, h3, h4) {
  font-family: var(--font-serif);
  line-height: 1.35;
}

.doc-markdown p,
.doc-markdown ul,
.doc-markdown ol {
  margin: 0 0 12px;
}

.doc-markdown pre {
  overflow-x: auto;
  padding: 12px;
  border-radius: 8px;
  background: #f5f5f4;
}

.doc-think {
  margin-bottom: 16px;
  color: #64748b;
}

.doc-think pre {
  white-space: pre-wrap;
  font-size: 13px;
}

.doc-steps,
.doc-todos {
  margin: 16px 0;
  padding: 16px 18px;
  border: 0.5px solid var(--doc-border);
  border-radius: 12px;
}

.doc-steps h2,
.doc-todos h2 {
  font-size: 14px;
  color: #8e8e8e;
  margin: 0 0 12px;
}

.doc-steps ol {
  margin: 0;
  padding-left: 20px;
}

.doc-step {
  margin-bottom: 16px;
}

.doc-step-title {
  display: block;
  margin-bottom: 8px;
}

.doc-step-labels {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

.doc-step-label {
  display: inline-flex;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 12px;
  background: #f0ede4;
  color: #44403c;
  text-decoration: none;
}

.doc-todos ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.doc-todo {
  padding: 4px 0;
}

.doc-todo.is-done {
  color: #9ca3af;
  text-decoration: line-through;
}

.doc-footer {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--doc-border);
  font-size: 14px;
  color: var(--doc-muted);
}

.doc-footer a {
  color: var(--doc-accent);
}

.doc-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.doc-index-list a {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  border-radius: 14px;
  border: 1px solid var(--doc-border);
  background: var(--doc-surface);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.doc-index-list a:hover {
  border-color: #d6d3d1;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.06);
}

.doc-index-list strong {
  font-family: var(--font-serif);
  font-size: 18px;
}

.doc-index-list span {
  font-size: 14px;
  color: var(--doc-muted);
}