/* ============================================================
   Knowe 技术文档站 · 样式（docs/docs.css）
   配色/字体/语言切换胶囊与官网 styles.css 对齐：
   canvas #FAF9F6 / surface #FFF / ink #211F1C / accent #4B5A8C
   ============================================================ */
:root {
  --canvas: #FAF9F6;
  --surface: #FFFFFF;
  --surface-2: #F4F3EF;
  --ink: #211F1C;
  --ink-2: #6C6A63;
  --ink-3: #A09E96;
  --accent: #4B5A8C;
  --accent-hover: #3F4C79;
  --accent-tint: #ECEEF4;
  --accent-ring: rgba(75, 90, 140, .24);
  --hairline: #ECEAE3;
  --code-bg: #17161d;
  --code-ink: #e8e6df;
  --r-xs: 8px;
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 18px;
  --shadow-1: 0 1px 2px rgba(33, 31, 28, .04);
  --shadow-2: 0 1px 3px rgba(33, 31, 28, .05), 0 6px 16px rgba(33, 31, 28, .06);
  --header-h: 60px;
  --sidebar-w: 280px;
  --toc-w: 264px;
  --font-sans: 'Inter', 'Plus Jakarta Sans', system-ui, -apple-system, 'Segoe UI',
               'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'Sometype Mono', ui-monospace, SFMono-Regular, Consolas,
               'Liberation Mono', monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ---------------- 顶栏 ---------------- */
.docs-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 50;
  background: rgba(250, 249, 246, .92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--hairline);
}
.docs-header-inner {
  max-width: 1520px;
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.docs-brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
  text-decoration: none;
  flex: 0 0 auto;
}
.docs-brand-word {
  font-family: 'Plus Jakarta Sans', Inter, sans-serif;
  font-weight: 800;
  font-size: 19px;
  letter-spacing: .01em;
  color: var(--ink);
  white-space: nowrap;
}
.docs-brand-sub {
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-2);
  border-left: 1px solid var(--hairline);
  padding-left: 12px;
  white-space: nowrap;
}
.docs-header-nav { margin-left: auto; display: flex; align-items: center; gap: 18px; }
.docs-header-link {
  font-size: 14px;
  color: var(--ink-2);
  text-decoration: none;
  transition: color .15s;
}
.docs-header-link:hover { color: var(--accent); }

/* 语言切换胶囊（与官网 styles.css 的 .lang-switch 完全一致） */
.lang-switch {
  display: flex; align-items: center; gap: 2px;
  height: 40px; padding: 3px;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  background: var(--surface);
  flex: 0 0 auto;
}
.lang-btn {
  border: 0; background: transparent;
  color: var(--ink-2);
  font-family: inherit;
  font-size: 15px; font-weight: 600; line-height: 1;
  padding: 0 14px; height: 32px;
  border-radius: 999px; cursor: pointer;
  transition: background .15s, color .15s;
}
.lang-btn[aria-pressed="true"] { background: var(--accent); color: #fff; }
.lang-btn:not([aria-pressed="true"]):hover { color: var(--ink); }
.lang-btn:not([aria-pressed="true"]):active { transform: scale(.96); }

/* 移动端目录按钮 */
.menu-btn {
  display: none;
  align-items: center; justify-content: center;
  width: 38px; height: 38px;
  border: 1px solid var(--hairline);
  border-radius: var(--r-sm);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  flex: 0 0 auto;
}
.menu-btn:hover { color: var(--accent); }

/* ---------------- 三栏布局 ---------------- */
.layout {
  max-width: 1520px;
  margin: 0 auto;
  padding: calc(var(--header-h) + 16px) 20px 64px;
  display: flex;
  align-items: flex-start;
  gap: 0;
}

/* 左：总目录 */
.sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  position: sticky;
  top: calc(var(--header-h) + 16px);
  max-height: calc(100vh - var(--header-h) - 32px);
  overflow-y: auto;
  padding: 6px 12px 28px 0;
}
.sidebar-title {
  font-size: 12px; font-weight: 700;
  color: var(--ink-3);
  letter-spacing: .09em; text-transform: uppercase;
  padding: 0 10px 12px;
}
.sidebar-scroll { padding-bottom: 12px; }

.toc-group { margin-bottom: 4px; }
.toc-group-head {
  display: flex; align-items: center; gap: 7px;
  width: 100%;
  border: 0; background: transparent;
  font-family: inherit;
  font-size: 14px; font-weight: 600;
  color: var(--ink);
  padding: 9px 10px;
  border-radius: var(--r-xs);
  cursor: pointer; text-align: left;
  transition: background .15s;
}
.toc-group-head:hover { background: var(--surface); }
.toc-caret {
  width: 15px; height: 15px; flex: 0 0 15px;
  opacity: .5;
  transition: transform .18s ease;
}
.toc-group.open .toc-caret { transform: rotate(90deg); }
.toc-group-label { flex: 1 1 auto; min-width: 0; }
.toc-group-items { display: none; padding: 3px 0 10px; }
.toc-group.open .toc-group-items { display: block; }

.toc-item {
  display: block;
  padding: 8px 10px 8px 26px;
  font-size: 13.5px;
  color: var(--ink-2);
  text-decoration: none;
  border-radius: var(--r-xs);
  line-height: 1.6;
  transition: background .12s, color .12s;
}
.toc-item:hover { color: var(--ink); background: var(--surface); }
.toc-item.active { color: var(--accent); background: var(--accent-tint); font-weight: 600; }

/* 中：正文 */
.content {
  flex: 1 1 auto;
  min-width: 0;
  max-width: 880px;
  margin: 0 auto;
  padding: 8px 48px 96px;
}

/* 右：漂浮目录 */
.toc-rail {
  width: var(--toc-w);
  flex: 0 0 var(--toc-w);
  position: sticky;
  top: calc(var(--header-h) + 16px);
  max-height: calc(100vh - var(--header-h) - 32px);
  overflow-y: auto;
  padding: 10px 0 28px 14px;
}
.toc-rail-title {
  font-size: 12px; font-weight: 700;
  color: var(--ink-3);
  letter-spacing: .09em; text-transform: uppercase;
  padding: 0 8px 10px;
}
.toc-rail-list { list-style: none; margin: 0; padding: 0; }
.toc-rail-list ul { list-style: none; margin: 0; padding: 0; }
.toc-link {
  display: block;
  text-decoration: none;
  color: var(--ink-2);
  font-size: 14px;
  padding: 7px 8px;
  border-left: 2px solid transparent;
  line-height: 1.75;
  transition: color .12s, border-color .12s;
  border-radius: 0 6px 6px 0;
}
.toc-link:hover { color: var(--ink); }
.toc-link.active { color: var(--accent); border-left-color: var(--accent); font-weight: 600; }
.toc-level-2 { padding-left: 20px; font-size: 13.5px; }
.toc-level-3 { padding-left: 34px; font-size: 13px; }

/* ---------------- Markdown 正文 ---------------- */
.markdown-body {
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  word-wrap: break-word;
}
.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  scroll-margin-top: calc(var(--header-h) + 28px);
  font-weight: 700;
  line-height: 1.35;
}
.markdown-body h1 {
  font-size: 30px;
  margin: 6px 0 22px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--hairline);
  letter-spacing: .01em;
}
.markdown-body h2 {
  font-size: 23px;
  margin: 46px 0 14px;
  padding-top: 6px;
}
.markdown-body h3 { font-size: 19px; margin: 32px 0 12px; }
.markdown-body h4 { font-size: 16.5px; margin: 26px 0 10px; font-weight: 600; }
.markdown-body h5, .markdown-body h6 { font-size: 15px; margin: 22px 0 10px; }
.markdown-body p { margin: 14px 0; }
.markdown-body a { color: var(--accent); text-decoration: none; }
.markdown-body a:hover { text-decoration: underline; }
.markdown-body strong { font-weight: 700; }
.markdown-body em { font-style: italic; }
.markdown-body del { color: var(--ink-3); }

.markdown-body ul, .markdown-body ol { margin: 14px 0; padding-left: 26px; }
.markdown-body li { margin: 7px 0; }
.markdown-body li > ul, .markdown-body li > ol { margin: 6px 0; }
.markdown-body li.task-item { list-style: none; margin-left: -20px; }
.markdown-body li.task-item input[type="checkbox"] {
  margin: 0 8px 0 0;
  accent-color: var(--accent);
  transform: translateY(1px);
}

.markdown-body blockquote {
  margin: 18px 0;
  padding: 12px 18px;
  background: var(--surface-2);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  color: var(--ink-2);
}
.markdown-body blockquote p { margin: 6px 0; }
.markdown-body blockquote > blockquote { margin: 8px 0; }

.markdown-body hr {
  border: 0;
  border-top: 1px solid var(--hairline);
  margin: 34px 0;
}

.markdown-body code {
  font-family: var(--font-mono);
  font-size: .87em;
  background: var(--surface-2);
  border: 1px solid var(--hairline);
  border-radius: 6px;
  padding: 1.5px 6px;
}
.markdown-body pre {
  margin: 18px 0;
  background: var(--code-bg);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-2);
  overflow: auto;
}
.markdown-body pre code {
  display: block;
  padding: 16px 18px;
  background: transparent;
  border: 0;
  border-radius: 0;
  color: var(--code-ink);
  font-size: 13.5px;
  line-height: 1.6;
  counter-reset: ln;
}
.markdown-body .ln { display: block; white-space: pre; }
.markdown-body .ln::before {
  counter-increment: ln;
  content: counter(ln);
  display: inline-block;
  width: 2.4em;
  margin-right: 1.4em;
  text-align: right;
  color: rgba(232, 230, 223, .28);
  user-select: none;
  -webkit-user-select: none;
}

.markdown-body table {
  border-collapse: separate;
  border-spacing: 0;
  margin: 20px 0;
  width: 100%;
  font-size: 14.5px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}
.markdown-body th {
  background: var(--surface-2);
  font-weight: 600;
  text-align: left;
}
.markdown-body th, .markdown-body td {
  border-bottom: 1px solid var(--hairline);
  border-right: 1px solid var(--hairline);
  padding: 9px 13px;
  vertical-align: top;
}
.markdown-body tr:last-child td { border-bottom: 0; }
.markdown-body th:last-child, .markdown-body td:last-child { border-right: 0; }

.markdown-body img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 20px 0;
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-2);
}

/* 加载 / 错误态 */
.state { text-align: center; color: var(--ink-3); padding: 48px 0; font-size: 14px; }
.state.error { color: #b3452f; }

/* 移动端遮罩 */
.scrim {
  position: fixed; inset: 0;
  background: rgba(33, 31, 28, .32);
  z-index: 60;
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 1180px) {
  .toc-rail { display: none; }
  .content { max-width: 860px; padding: 8px 32px 96px; }
}
@media (max-width: 1080px) {
  .menu-btn { display: flex; }
  .sidebar {
    position: fixed;
    top: var(--header-h); left: 0; bottom: 0;
    width: 300px; max-width: 86vw;
    max-height: none;
    z-index: 70;
    background: var(--canvas);
    border-right: 1px solid var(--hairline);
    padding: 18px 16px 32px;
    transform: translateX(-102%);
    transition: transform .22s ease;
    box-shadow: var(--shadow-2);
  }
  .sidebar.open { transform: translateX(0); }
  .content { padding: 8px 24px 80px; }
}
@media (max-width: 720px) {
  .docs-brand-sub { display: none; }
  .docs-header-inner { padding: 0 14px; }
  .layout { padding-left: 14px; padding-right: 14px; }
  .content { padding: 6px 6px 72px; }
  .markdown-body h1 { font-size: 25px; }
  .markdown-body h2 { font-size: 20px; }
  .markdown-body table { font-size: 13px; }
}