:root {
  --font-scale: 1.16;
  --bg: #f6f8fb;
  --text: #1f2328;
  --muted: #57606a;
  --panel-bg: #ffffff;
  --panel-border: #e5e7eb;
  --shadow: 0 1px 2px rgba(0,0,0,.03);
  --nav-bg: #ffffff;
  --nav-border: #d0d7de;
  --link: #0969da;
  --link-hover: #0a58ca;
  --code-bg: #eef2ff;
  --pill-bg: #eef2ff;
  --pill-text: #3754b5;
  --tool-bg: rgba(255,255,255,.96);
  --tool-border: #dbe5f0;
  --toast-bg: rgba(17,24,39,.92);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --text: #e6edf3;
    --muted: #9aa4b2;
    --panel-bg: #0f172a;
    --panel-border: #223044;
    --shadow: 0 1px 2px rgba(0,0,0,.35);
    --nav-bg: #0f172a;
    --nav-border: #223044;
    --link: #8ab4ff;
    --link-hover: #a8c5ff;
    --code-bg: #111b2e;
    --pill-bg: #111b2e;
    --pill-text: #a8c5ff;
    --tool-bg: rgba(15,23,42,.92);
    --tool-border: #223044;
    --toast-bg: rgba(0,0,0,.75);
  }
}

html[data-theme="light"] {
  --bg: #f6f8fb;
  --text: #1f2328;
  --muted: #57606a;
  --panel-bg: #ffffff;
  --panel-border: #e5e7eb;
  --shadow: 0 1px 2px rgba(0,0,0,.03);
  --nav-bg: #ffffff;
  --nav-border: #d0d7de;
  --link: #0969da;
  --link-hover: #0a58ca;
  --code-bg: #eef2ff;
  --pill-bg: #eef2ff;
  --pill-text: #3754b5;
  --tool-bg: rgba(255,255,255,.96);
  --tool-border: #dbe5f0;
  --toast-bg: rgba(17,24,39,.92);
}

html[data-theme="dark"] {
  --bg: #0b1220;
  --text: #e6edf3;
  --muted: #9aa4b2;
  --panel-bg: #0f172a;
  --panel-border: #223044;
  --shadow: 0 1px 2px rgba(0,0,0,.35);
  --nav-bg: #0f172a;
  --nav-border: #223044;
  --link: #8ab4ff;
  --link-hover: #a8c5ff;
  --code-bg: #111b2e;
  --pill-bg: #111b2e;
  --pill-text: #a8c5ff;
  --tool-bg: rgba(15,23,42,.92);
  --tool-border: #223044;
  --toast-bg: rgba(0,0,0,.75);
}

html[data-theme="black"] {
  --bg: #05070f;
  --text: #e6edf3;
  --muted: #9aa4b2;
  --panel-bg: #0a0f1f;
  --panel-border: #1a2740;
  --shadow: 0 1px 2px rgba(0,0,0,.55);
  --nav-bg: #0a0f1f;
  --nav-border: #1a2740;
  --link: #8ab4ff;
  --link-hover: #b7d1ff;
  --code-bg: #0f162c;
  --pill-bg: #0f162c;
  --pill-text: #b7d1ff;
  --tool-bg: rgba(10,15,31,.92);
  --tool-border: #1a2740;
  --toast-bg: rgba(0,0,0,.8);
}

html[data-theme="sepia"] {
  --bg: #f7f2e7;
  --text: #2b2118;
  --muted: #6b5b4d;
  --panel-bg: #fffaf0;
  --panel-border: #eadcc8;
  --shadow: 0 1px 2px rgba(0,0,0,.05);
  --nav-bg: #fffaf0;
  --nav-border: #e0cfb8;
  --link: #8a4b00;
  --link-hover: #a85e00;
  --code-bg: #f3e8d8;
  --pill-bg: #f3e8d8;
  --pill-text: #7a3f00;
  --tool-bg: rgba(255,250,240,.92);
  --tool-border: #e0cfb8;
  --toast-bg: rgba(43,33,24,.92);
}

html[data-theme="forest"] {
  --bg: #06130f;
  --text: #e6edf3;
  --muted: #9aa4b2;
  --panel-bg: #0b1f17;
  --panel-border: #133829;
  --shadow: 0 1px 2px rgba(0,0,0,.55);
  --nav-bg: #0b1f17;
  --nav-border: #133829;
  --link: #63d5a5;
  --link-hover: #7ee7bd;
  --code-bg: #0d2a20;
  --pill-bg: #0d2a20;
  --pill-text: #8ff0c9;
  --tool-bg: rgba(11,31,23,.92);
  --tool-border: #133829;
  --toast-bg: rgba(0,0,0,.8);
}

html[data-theme="slate"] {
  --bg: #0a0f1a;
  --text: #e6edf3;
  --muted: #9aa4b2;
  --panel-bg: #0f1728;
  --panel-border: #26324a;
  --shadow: 0 1px 2px rgba(0,0,0,.5);
  --nav-bg: #0f1728;
  --nav-border: #26324a;
  --link: #7aa2f7;
  --link-hover: #9bb8ff;
  --code-bg: #111b2e;
  --pill-bg: #111b2e;
  --pill-text: #a8c5ff;
  --tool-bg: rgba(15,23,40,.92);
  --tool-border: #26324a;
  --toast-bg: rgba(0,0,0,.8);
}

html[data-theme="purple"] {
  --bg: #100a1a;
  --text: #efe9ff;
  --muted: #b7b0c8;
  --panel-bg: #1a0f2a;
  --panel-border: #34204d;
  --shadow: 0 1px 2px rgba(0,0,0,.55);
  --nav-bg: #1a0f2a;
  --nav-border: #34204d;
  --link: #c4b5fd;
  --link-hover: #d8b4fe;
  --code-bg: #22113a;
  --pill-bg: #22113a;
  --pill-text: #e9d5ff;
  --tool-bg: rgba(26,15,42,.92);
  --tool-border: #34204d;
  --toast-bg: rgba(0,0,0,.8);
}

body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif; font-size: calc(18px * var(--font-scale)); line-height: 1.9; margin: 0; background: var(--bg); color: var(--text); }
main { max-width: 1080px; margin: 0 auto; padding: 32px 20px 60px; }
header { margin-bottom: 24px; }
nav { margin: 16px 0 24px; display: flex; flex-wrap: wrap; gap: 12px; }
nav a, nav button { display: inline-block; padding: 8px 14px; border: 1px solid var(--nav-border); border-radius: 999px; text-decoration: none; color: var(--link); background: var(--nav-bg); font: inherit; }
nav button { cursor: pointer; }
article, .panel { background: var(--panel-bg); border: 1px solid var(--panel-border); border-radius: 14px; padding: 24px; box-shadow: var(--shadow); }
article { margin-top: 20px; }
h1, h2, h3 { line-height: 1.35; }
h1 { font-size: calc(2rem * var(--font-scale)); }
h2 { font-size: calc(1.45rem * var(--font-scale)); }
h3 { font-size: calc(1.18rem * var(--font-scale)); }
p { margin: 12px 0; font-size: calc(1rem * var(--font-scale)); }
ul { padding-left: 24px; }
li { font-size: calc(1rem * var(--font-scale)); }
code { background: var(--code-bg); padding: 2px 6px; border-radius: 6px; }
.small { color: var(--muted); font-size: 14px; }
.note { margin: 16px 0 0; color: var(--muted); }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; }
.card { background: var(--panel-bg); border: 1px solid var(--panel-border); border-radius: 12px; padding: 16px 18px; height: 100%; box-sizing: border-box; box-shadow: var(--shadow); }
.grid a { text-decoration: none; color: inherit; }
.grid .card:hover { border-color: var(--link); }
.section-block { margin-top: 28px; }
.eyebrow { display: inline-block; margin-bottom: 8px; color: var(--muted); font-size: 13px; letter-spacing: .04em; text-transform: uppercase; }
.pill { display: inline-block; margin-right: 8px; margin-bottom: 8px; padding: 4px 10px; border-radius: 999px; background: var(--pill-bg); color: var(--pill-text); font-size: 13px; }
.font-zoom { position: fixed; right: 18px; top: 50%; transform: translateY(-50%); z-index: 999; display: flex; flex-direction: column; gap: 10px; padding: 10px; min-width: 122px; border: 1px solid var(--tool-border); border-radius: 14px; background: var(--tool-bg); box-shadow: 0 10px 24px rgba(15, 23, 42, .12); }
.tool-panel-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.tool-panel-body { display: flex; flex-direction: column; gap: 10px; }
.tool-group { display: flex; flex-direction: column; gap: 8px; }
.tool-group + .tool-group { padding-top: 10px; border-top: 1px solid color-mix(in srgb, var(--panel-border) 78%, transparent); }
.tool-group-title { font-size: 12px; color: var(--muted); }
.tool-button-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; }
.tool-button-row.two-column { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.tool-group-note { color: var(--muted); font-size: 12px; line-height: 1.5; }
.font-zoom-label { font-size: 12px; color: var(--muted); text-align: center; }
.font-zoom button, .panel-toggle { border: 1px solid var(--nav-border); background: var(--nav-bg); color: var(--text); border-radius: 10px; padding: 8px 10px; cursor: pointer; font-size: 13px; }
.font-zoom button:hover { border-color: var(--link); color: var(--link-hover); }
.font-zoom select { border: 1px solid var(--nav-border); background: var(--nav-bg); color: var(--text); border-radius: 10px; padding: 8px 10px; cursor: pointer; font-size: 13px; font: inherit; }
.font-zoom select:hover { border-color: var(--link); }
.tool-check { display: flex; align-items: center; gap: 8px; border: 1px solid var(--nav-border); background: var(--nav-bg); color: var(--text); border-radius: 10px; padding: 8px 10px; cursor: pointer; font-size: 13px; }
.tool-check:hover { border-color: var(--link); }
.tool-check input { margin: 0; accent-color: var(--link); }
.panel-toggle:hover { border-color: var(--link); color: var(--link-hover); }
.font-zoom.is-collapsed { min-width: 0; padding: 8px; }
.font-zoom.is-collapsed .tool-panel-body, .font-zoom.is-collapsed .font-zoom-label { display: none; }
.font-zoom.is-collapsed .tool-panel-head { justify-content: center; }
.copy-toast { position: fixed; left: 50%; bottom: 18px; transform: translateX(-50%); background: var(--toast-bg); color: #fff; padding: 10px 14px; border-radius: 12px; font-size: 13px; opacity: 0; pointer-events: none; transition: opacity .2s ease; z-index: 1000; }
.copy-toast.show { opacity: 1; }
footer { margin-top: 24px; color: var(--muted); font-size: 14px; }
@media (max-width: 960px) {
  .font-zoom { right: 10px; bottom: 12px; top: auto; transform: none; min-width: 0; }
  .font-zoom .tool-panel-body { flex-direction: row; align-items: center; flex-wrap: wrap; }
  .font-zoom-label { display: none; }
}

.layout-container { display: flex; gap: 30px; align-items: flex-start; }
.sidebar { flex: 0 0 280px; position: sticky; top: 20px; max-height: calc(100vh - 40px); overflow-y: auto; background: var(--panel-bg); padding: 20px; border: 1px solid var(--panel-border); border-radius: 14px; box-shadow: var(--shadow); transition: flex-basis .2s ease, width .2s ease, padding .2s ease; }
.sidebar-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; margin-bottom: 12px; }
.sidebar-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.sidebar-title { margin: 0; }
.sidebar-note { margin-top: 0; margin-bottom: 14px; }
.sidebar-mode-status { margin: -4px 0 14px; color: var(--muted); font-size: 13px; }
.sidebar-body { overflow: hidden; }
.sidebar.is-collapsed { flex-basis: 78px; width: 78px; padding: 14px 10px; overflow: hidden; }
.sidebar.is-collapsed .sidebar-title,
.sidebar.is-collapsed .sidebar-note,
.sidebar.is-collapsed .sidebar-mode-status,
.sidebar.is-collapsed .sidebar-body { display: none; }
.sidebar.is-collapsed .sidebar-head { justify-content: center; margin-bottom: 0; }
.sidebar.is-collapsed .sidebar-actions [data-toc-global] { display: none; }
.sidebar.is-collapsed .sidebar-actions [data-toc-focus-toggle],
.sidebar.is-collapsed .sidebar-actions [data-toc-branch-toggle],
.sidebar.is-collapsed .sidebar-actions [data-toc-section-toggle] { display: none; }
.content-area { flex: 1; min-width: 0; }
.toc-tree { list-style: none; padding-left: 0; margin: 0; }
.toc-tree .toc-tree { margin-top: 6px; padding-left: 14px; border-left: 1px solid var(--panel-border); }
.toc-tree li { margin-bottom: 6px; line-height: 1.4; }
.toc-tree li { transition: opacity .18s ease, filter .18s ease; }
.toc-item-row { display: flex; align-items: flex-start; gap: 8px; position: relative; padding: 6px 10px 6px 12px; border: 1px solid transparent; border-radius: 10px; transition: background .18s ease, border-color .18s ease, box-shadow .18s ease, transform .18s ease; }
.toc-item-row::before { content: ""; position: absolute; left: 0; top: 7px; bottom: 7px; width: 3px; border-radius: 999px; background: transparent; box-shadow: none; transition: background .18s ease, box-shadow .18s ease; }
.toc-toggle, .toc-spacer { flex: 0 0 20px; width: 20px; height: 20px; }
.toc-toggle { border: 1px solid var(--nav-border); border-radius: 6px; background: var(--nav-bg); color: var(--muted); cursor: pointer; padding: 0; line-height: 1; font-size: 14px; }
.toc-toggle:hover { border-color: var(--link); color: var(--link-hover); }
.toc-global-toggle { border: 1px solid var(--nav-border); border-radius: 8px; background: var(--nav-bg); color: var(--muted); cursor: pointer; padding: 6px 8px; line-height: 1; font-size: 12px; }
.toc-global-toggle:hover { border-color: var(--link); color: var(--link-hover); }
.sidebar.is-focus-current-path .toc-tree li:not(.toc-current):not(.toc-ancestor) { opacity: 0.34; filter: saturate(0.4); }
.sidebar.is-focus-current-path .toc-tree li:not(.toc-current):not(.toc-ancestor) > .toc-item-row { background: transparent; border-color: transparent; box-shadow: none; transform: none; }
.sidebar.is-focus-current-path .toc-tree li:not(.toc-current):not(.toc-ancestor) > .toc-item-row a { color: color-mix(in srgb, var(--muted) 88%, var(--text)); }
.sidebar.is-focus-current-path .toc-tree li:not(.toc-current):not(.toc-ancestor) > .toc-item-row::before { background: transparent; box-shadow: none; }
.sidebar.is-current-branch-only .toc-tree .toc-children.is-collapsed { display: none; }
.sidebar.is-current-section-only .sidebar-body > .toc-tree > li.toc-h1:not(.toc-section-current) { display: none; }
.toc-spacer { display: inline-block; }
.toc-children.is-collapsed { display: none; }
.toc-tree .toc-h1 > .toc-item-row { font-weight: 600; margin-top: 12px; font-size: 1.05rem; }
.toc-tree .toc-h2 > .toc-item-row { font-size: 0.95rem; color: var(--muted); }
.toc-tree .toc-h3 > .toc-item-row { font-size: 0.9rem; color: var(--muted); opacity: 0.92; }
.toc-tree .toc-h4 > .toc-item-row { font-size: 0.84rem; color: var(--muted); opacity: 0.84; }
.toc-tree a { text-decoration: none; color: inherit; display: block; flex: 1; min-width: 0; }
.toc-tree a:hover { color: var(--link); text-decoration: underline; }
.toc-tree a.is-active { color: var(--link-hover); font-weight: 700; text-shadow: 0 0 12px color-mix(in srgb, var(--link) 24%, transparent); }
.toc-current > .toc-item-row { background: color-mix(in srgb, var(--code-bg) 86%, transparent); border-color: color-mix(in srgb, var(--link) 52%, var(--panel-border)); box-shadow: 0 0 0 1px color-mix(in srgb, var(--link) 18%, transparent), 0 10px 24px color-mix(in srgb, var(--link) 12%, transparent); transform: translateX(2px); }
.toc-current > .toc-item-row::before { background: linear-gradient(180deg, var(--link-hover), var(--link)); box-shadow: 0 0 14px color-mix(in srgb, var(--link) 60%, transparent); }
.toc-current > .toc-item-row .toc-toggle { border-color: var(--link); color: var(--link-hover); background: color-mix(in srgb, var(--code-bg) 70%, transparent); box-shadow: 0 0 0 1px color-mix(in srgb, var(--link) 15%, transparent); }
.toc-ancestor > .toc-item-row a { color: var(--text); }
.toc-anchor-paragraph { scroll-margin-top: 20px; }
@media (max-width: 960px) {
  .layout-container { flex-direction: column; }
  .sidebar { flex: none; width: auto; position: static; max-height: none; }
  .sidebar.is-collapsed { width: auto; flex-basis: auto; }
  .sidebar-actions { justify-content: flex-start; }
}