/* 布局：半透明顶栏 + 侧边目录 + 单一阅读栏。正文、代码、表格和对比卡片共用 --measure 这一个宽度 */
:root {
  color-scheme: light;

  --bg: #ffffff;
  --bg-soft: #f5f5f7;
  --fg: #1d1d1f;
  --fg-2: #515154;
  --fg-3: #6e6e73;
  --line: rgba(0, 0, 0, .1);
  --hover: rgba(0, 0, 0, .05);
  --scroll: rgba(0, 0, 0, .22);
  --accent: #0071e3;
  --accent-ink: #0066cc;
  --accent-soft: rgba(0, 113, 227, .1);
  --ok: #1f7a4d;
  --bar: rgba(255, 255, 255, .72);
  --glass: rgba(250, 250, 252, .82);
  --code-bg: #f5f5f7;
  --warn-bg: #fff4e5;
  --warn-fg: #8a5100;
  --shadow-pop: 0 28px 90px rgba(0, 0, 0, .26), 0 0 0 .5px rgba(0, 0, 0, .14);
  --shadow-stage: 0 20px 40px -28px rgba(0, 0, 0, .6);

  /* 对比卡片在两种主题下都是深色 */
  --stage: #1d1d1f;
  --stage-fg: #f5f5f7;
  --stage-fg-2: #b4b4b9;
  --stage-line: rgba(255, 255, 255, .13);
  --stage-ring: transparent;

  /* 语法配色取自 Xcode 默认主题 */
  --hl-kw: #9b2393;
  --hl-str: #c41a16;
  --hl-num: #1c00cf;
  --hl-com: #5d6c79;
  --hl-type: #0b4f79;
  --hl-fn: #326d74;
  --hl-meta: #643820;
  --hl-res: #1f7a4d;
  --dk-kw: #fc5fa3;
  --dk-str: #fc6a5d;
  --dk-num: #d0bf69;
  --dk-com: #929eaa;
  --dk-type: #5dd8ff;
  --dk-fn: #67b7a4;
  --dk-meta: #fd8f3f;
  --dk-res: #8bd5a6;

  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;

  /* 间距以 4px 为基准 */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;
  --sp-7: 48px;
  --sp-8: 64px;

  --measure: 760px;
  --home-w: 880px;
  --side-w: 296px;
  --ease: cubic-bezier(.16, 1, .3, 1);
  --bar-h: 52px;
  --safe-top: env(safe-area-inset-top, 0px);
  --gutter-l: max(16px, env(safe-area-inset-left, 0px));
  --gutter-r: max(16px, env(safe-area-inset-right, 0px));
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #000000;
    --bg-soft: #1c1c1e;
    --fg: #f5f5f7;
    --fg-2: #b4b4b9;
    --fg-3: #98989d;
    --line: rgba(255, 255, 255, .16);
    --hover: rgba(255, 255, 255, .08);
    --scroll: rgba(255, 255, 255, .26);
    --accent: #0a84ff;
    --accent-ink: #2997ff;
    --accent-soft: rgba(10, 132, 255, .18);
    --ok: #63d08f;
    --bar: rgba(22, 22, 23, .72);
    --glass: rgba(44, 44, 46, .78);
    --code-bg: #131315;
    --warn-bg: #2e2312;
    --warn-fg: #ffb340;
    --shadow-pop: 0 28px 90px rgba(0, 0, 0, .7), 0 0 0 .5px rgba(255, 255, 255, .16);
    --shadow-stage: none;
    --stage: #1c1c1e;
    --stage-ring: rgba(255, 255, 255, .16);
    --hl-kw: var(--dk-kw);
    --hl-str: var(--dk-str);
    --hl-num: var(--dk-num);
    --hl-com: var(--dk-com);
    --hl-type: var(--dk-type);
    --hl-fn: var(--dk-fn);
    --hl-meta: var(--dk-meta);
    --hl-res: var(--dk-res);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #000000;
  --bg-soft: #1c1c1e;
  --fg: #f5f5f7;
  --fg-2: #b4b4b9;
  --fg-3: #98989d;
  --line: rgba(255, 255, 255, .16);
  --hover: rgba(255, 255, 255, .08);
  --scroll: rgba(255, 255, 255, .26);
  --accent: #0a84ff;
  --accent-ink: #2997ff;
  --accent-soft: rgba(10, 132, 255, .18);
  --ok: #63d08f;
  --bar: rgba(22, 22, 23, .72);
  --glass: rgba(44, 44, 46, .78);
  --code-bg: #131315;
  --warn-bg: #2e2312;
  --warn-fg: #ffb340;
  --shadow-pop: 0 28px 90px rgba(0, 0, 0, .7), 0 0 0 .5px rgba(255, 255, 255, .16);
  --shadow-stage: none;
  --stage: #1c1c1e;
  --stage-ring: rgba(255, 255, 255, .16);
  --hl-kw: var(--dk-kw);
  --hl-str: var(--dk-str);
  --hl-num: var(--dk-num);
  --hl-com: var(--dk-com);
  --hl-type: var(--dk-type);
  --hl-fn: var(--dk-fn);
  --hl-meta: var(--dk-meta);
  --hl-res: var(--dk-res);
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scrollbar-color: var(--scroll) transparent;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 400 17px/1.8 var(--font-sans);
  -webkit-font-smoothing: antialiased;
  text-autospace: normal;
}

body::before {
  content: "";
  position: fixed;
  inset: 0 0 auto;
  height: var(--safe-top);
  z-index: 10;
  background: var(--bar);
}

::selection { background: color-mix(in srgb, var(--accent) 26%, transparent); }
input { caret-color: var(--accent); }

a { color: var(--accent-ink); text-decoration: none; text-underline-offset: .2em; text-decoration-thickness: 1px; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
main:focus { outline: none; }
button { font: inherit; color: inherit; }

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

svg.i {
  width: 1em;
  height: 1em;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

kbd { font: 500 11px/1 var(--font-sans); color: var(--fg-3); }

/* ---------- 顶栏 ---------- */

.bar {
  position: sticky;
  top: var(--safe-top);
  z-index: 30;
  background: var(--bar);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: .5px solid var(--line);
}

.bar-in {
  height: var(--bar-h);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding-left: var(--gutter-l);
  padding-right: var(--gutter-r);
}

.bar-fill { flex: 1; }

.bar-progress { position: absolute; inset: auto 0 -.5px; height: 2px; overflow: hidden; pointer-events: none; }
.bar-progress i {
  display: block;
  height: 100%;
  background: var(--accent);
  transform: scaleX(var(--p, 0));
  transform-origin: left;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--fg);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: -.01em;
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }

.brand-mark {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: var(--fg);
  color: var(--bg);
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: -.02em;
}

.icon-btn {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  flex: none;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--fg-2);
  font-size: 18px;
  cursor: pointer;
  transition: background .2s, color .2s;
}
.icon-btn:hover { background: var(--hover); color: var(--fg); }

#theme-toggle [data-t] { display: none; }
#theme-toggle[data-mode="auto"] [data-t="auto"],
#theme-toggle[data-mode="light"] [data-t="sun"],
#theme-toggle[data-mode="dark"] [data-t="moon"] { display: grid; }

.search-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 32px;
  padding: 0 10px 0 11px;
  border: 0;
  border-radius: 9px;
  background: var(--hover);
  color: var(--fg-2);
  font-size: 14px;
  cursor: pointer;
  transition: background .2s;
}
.search-pill:hover { background: var(--line); }
.search-text { min-width: 88px; text-align: left; }

.lang-pick {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding-left: 11px;
  border-radius: 9px;
  background: var(--hover);
  color: var(--fg-2);
  font-size: 14px;
  cursor: pointer;
}
.lang-pick select {
  appearance: none;
  height: 100%;
  padding: 0 26px 0 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--fg);
  font: 500 14px var(--font-sans);
  cursor: pointer;
}
.lang-pick::after {
  content: "";
  position: absolute;
  right: 11px;
  top: 50%;
  width: 6px;
  height: 6px;
  margin-top: -5px;
  border-right: 1.6px solid var(--fg-3);
  border-bottom: 1.6px solid var(--fg-3);
  transform: rotate(45deg);
  pointer-events: none;
}
.lang-pick:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- 外壳 ---------- */

.shell {
  display: grid;
  grid-template-columns: var(--side-w) minmax(0, 1fr);
}

:root[data-view="home"] .shell,
:root[data-side="closed"] .shell { grid-template-columns: minmax(0, 1fr); }
:root[data-view="home"] .side,
:root[data-side="closed"] .side { display: none; }

.side {
  position: sticky;
  top: calc(var(--bar-h) + var(--safe-top));
  height: calc(100dvh - var(--bar-h) - var(--safe-top));
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  padding: var(--sp-5) var(--sp-3) var(--sp-7);
  border-right: .5px solid var(--line);
  font-size: 15px;
  line-height: 1.4;
}

.side-part + .side-part { margin-top: var(--sp-5); }

.side-part h2 {
  margin: 0 0 var(--sp-1);
  padding-inline: var(--sp-3);
  font-size: 13px;
  font-weight: 600;
  color: var(--fg-3);
}

.side ol { display: flex; flex-direction: column; gap: 2px; list-style: none; margin: 0; padding: 0; }

.side-link {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  min-height: 38px;
  padding: var(--sp-2) var(--sp-3);
  border-radius: 10px;
  color: var(--fg);
  transition: background .2s;
}
.side-link:hover { background: var(--hover); text-decoration: none; }
.side-link .n {
  display: grid;
  place-items: center end;
  width: 20px;
  flex: none;
  color: var(--fg-3);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}
.side-link .t { flex: 1; min-width: 0; }
.side-link .tick { display: grid; color: var(--ok); font-size: 14px; opacity: 0; transition: opacity .3s; }

.side-ch.is-done .tick { opacity: 1; }
.side-ch.is-active > .side-link { background: var(--hover); font-weight: 600; }

.side-secs {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .36s var(--ease);
}
.side-secs > ol { overflow: hidden; min-height: 0; }
.side-ch.is-active .side-secs { grid-template-rows: 1fr; }
.side-ch.is-active .side-secs > ol { padding-block: var(--sp-1) var(--sp-2); }

.side-secs a {
  display: block;
  padding: 6px var(--sp-3) 6px 44px;
  border-radius: 8px;
  color: var(--fg-2);
  font-size: 14px;
  line-height: 1.4;
  transition: color .2s, background .2s;
}
.side-secs a:hover { background: var(--hover); color: var(--fg); text-decoration: none; }
.side-secs a.is-on { color: var(--accent-ink); font-weight: 600; }

.scrim { display: none; }

.main {
  min-width: 0;
  padding-left: var(--gutter-l);
  padding-right: var(--gutter-r);
  view-transition-name: main;
}

@media (min-width: 720px) {
  .main {
    padding-left: max(var(--sp-6), env(safe-area-inset-left, 0px));
    padding-right: max(var(--sp-6), env(safe-area-inset-right, 0px));
  }
}

@view-transition { navigation: auto; }

::view-transition-old(root), ::view-transition-new(root) { animation: none; }
::view-transition-old(main) { animation: fade-out .14s ease both; }
::view-transition-new(main) { animation: rise-in .36s var(--ease) both; }

@keyframes fade-out { to { opacity: 0; } }
@keyframes rise-in { from { opacity: 0; transform: translateY(8px); } }

/* ---------- 章节 ---------- */

.doc {
  max-width: var(--measure);
  margin-inline: auto;
  padding-block: var(--sp-6) 88px;
}

.doc-head { padding-bottom: var(--sp-4); border-bottom: .5px solid var(--line); }

.doc-head h1 {
  margin: 0;
  font: 700 clamp(30px, 3.4vw, 36px)/1.2 var(--font-display);
  letter-spacing: -.018em;
  text-wrap: balance;
}

.lede { margin: 0; color: var(--fg-2); text-wrap: pretty; }
.doc-head .lede { margin-top: var(--sp-1); font-size: 16px; line-height: 1.6; }

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-1) var(--sp-4);
  margin: var(--sp-2) 0 0;
  padding: 0;
  list-style: none;
  color: var(--fg-3);
  font-size: 13px;
  line-height: 1.5;
}
.meta li { display: inline-flex; align-items: center; gap: 5px; }

.flow { display: flex; flex-direction: column; gap: var(--sp-4); }
.flow > * { min-width: 0; }
.flow > .vs { margin-block: var(--sp-2); }
.flow > .map { margin-block: var(--sp-1); }
.flow p { margin: 0; text-wrap: pretty; }
.flow h3 {
  margin: var(--sp-3) 0 calc(var(--sp-1) * -1);
  font: 600 20px/1.3 var(--font-display);
  letter-spacing: -.01em;
}
.flow ul, .flow ol { margin: 0; padding-left: 1.3em; display: flex; flex-direction: column; gap: var(--sp-1); }
.flow li::marker { color: var(--fg-3); }

.intro { margin-top: var(--sp-5); }

.sec { padding-top: var(--sp-7); scroll-margin-top: calc(var(--bar-h) + var(--safe-top) - var(--sp-5)); }
.doc-head + .sec { padding-top: var(--sp-5); }
.sec > h2 {
  margin: 0 0 var(--sp-3);
  font: 600 26px/1.25 var(--font-display);
  letter-spacing: -.014em;
  text-wrap: balance;
}

code {
  font-family: var(--font-mono);
  font-size: .86em;
  padding: .12em .36em;
  border-radius: 5px;
  background: var(--bg-soft);
}
pre code { padding: 0; background: none; font-size: inherit; border-radius: 0; }

strong { font-weight: 600; }

/* ---------- 代码块 ---------- */

.code { margin: 0; border-radius: 14px; background: var(--code-bg); overflow: hidden; }

.code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-2) var(--sp-2) 0 var(--sp-4);
  color: var(--fg-3);
  font-size: 12.5px;
  font-weight: 500;
  line-height: 24px;
}

.code pre, .vs-pane pre {
  margin: 0;
  overflow-x: auto;
  font: 400 13.5px/1.65 var(--font-mono);
  tab-size: 4;
}
.code pre { padding: 6px var(--sp-4) 14px; }

.ln {
  display: block;
  padding-left: calc((var(--i, 0) + 2) * 1ch);
  text-indent: calc((var(--i, 0) + 2) * -1ch);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.ind { white-space: pre; }

.output {
  display: flex;
  gap: var(--sp-3);
  padding: 10px var(--sp-4) var(--sp-3);
  border-top: .5px solid var(--line);
  color: var(--fg-2);
}
.output > span { flex: none; font-size: 12.5px; font-weight: 500; line-height: 22px; color: var(--fg-3); }
.output pre { padding: 0; min-width: 0; }

.copy {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  height: 24px;
  padding: 0 var(--sp-2);
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: inherit;
  font-size: 12.5px;
  cursor: pointer;
  transition: opacity .2s, background .2s;
}
.copy:hover { background: var(--hover); }
.copy.is-done { color: var(--ok); opacity: 1; }

@media (hover: hover) {
  .copy { opacity: 0; }
  .code:hover .copy, .vs-pane:hover .copy, .copy:focus-visible { opacity: 1; }
}

.hljs-keyword, .hljs-literal, .hljs-selector-tag { color: var(--hl-kw); font-weight: 500; }
.hljs-string, .hljs-regexp { color: var(--hl-str); }
.hljs-number { color: var(--hl-num); }
.hljs-comment, .hljs-quote { color: var(--hl-com); }
.hljs-comment.res { display: inline-block; max-width: 100%; text-indent: 0; color: var(--hl-res); }
.hljs-doctag { color: var(--hl-com); font-weight: 600; }
.hljs-type, .hljs-title.class_, .hljs-title.class_.inherited__, .hljs-name { color: var(--hl-type); }
.hljs-title.function_, .hljs-built_in, .hljs-section { color: var(--hl-fn); }
.hljs-meta, .hljs-attr, .hljs-attribute { color: var(--hl-meta); }
.hljs-meta .hljs-string { color: var(--hl-str); }
.hljs-subst { color: inherit; }

/* ---------- 对比卡片：一整块深色面，用细线分区，右栏用标签切换语言 ---------- */

.vs {
  container: vs / inline-size;
  color-scheme: dark;
  scroll-margin-top: calc(var(--bar-h) + var(--safe-top) + var(--sp-4));
  border-radius: 20px;
  background: var(--stage);
  color: var(--stage-fg);
  box-shadow: var(--shadow-stage), inset 0 0 0 .5px var(--stage-ring);
  overflow: hidden;

  --line: var(--stage-line);
  --hover: rgba(255, 255, 255, .1);
  --ok: var(--dk-res);
  --hl-res: var(--dk-res);
  --hl-kw: var(--dk-kw);
  --hl-str: var(--dk-str);
  --hl-num: var(--dk-num);
  --hl-com: var(--dk-com);
  --hl-type: var(--dk-type);
  --hl-fn: var(--dk-fn);
  --hl-meta: var(--dk-meta);
}

.vs code { background: rgba(255, 255, 255, .11); }
.vs pre code { background: none; }

.vs-title {
  margin: 0;
  padding: var(--sp-4) 20px var(--sp-3);
  font: 600 19px/1.3 var(--font-display);
  letter-spacing: -.008em;
  text-wrap: balance;
}

.vs-intro { margin: 0; padding: 0 20px var(--sp-3); color: var(--stage-fg-2); font-size: 15px; line-height: 1.65; }

.vs-code {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: .5px solid var(--stage-line);
}

.vs-pane { display: flex; flex-direction: column; min-width: 0; }
.vs-other { border-top: .5px solid var(--stage-line); }

.vs-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-2);
  min-height: 44px;
  padding: var(--sp-2) var(--sp-2) 0 20px;
}

.vs-lang { color: var(--c); font-size: 13.5px; font-weight: 600; }
.vs-bar .copy { flex: none; color: var(--stage-fg-2); }

.vs-pane pre { flex: 1; padding: var(--sp-2) 20px var(--sp-4); font-size: 13px; line-height: 1.65; }

.seg-scroll { min-width: 0; overflow-x: auto; scrollbar-width: none; }
.seg-scroll::-webkit-scrollbar { display: none; }

.seg {
  position: relative;
  display: inline-grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(68px, 1fr);
  padding: 2px;
  border-radius: 9px;
  background: rgba(255, 255, 255, .09);
}

.seg-thumb {
  position: absolute;
  inset: 2px auto 2px 2px;
  width: calc((100% - 4px) / var(--n, 1));
  border-radius: 7px;
  background: rgba(255, 255, 255, .15);
  box-shadow: 0 1px 2px rgba(0, 0, 0, .35);
  transform: translateX(calc(var(--i, 0) * 100%));
  transition: transform .36s var(--ease);
}

.seg button {
  position: relative;
  height: 26px;
  padding: 0 var(--sp-3);
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--stage-fg-2);
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: color .2s;
}
.seg button[aria-selected="true"] { color: var(--c); font-weight: 600; }

.vs .lang-pick { height: 30px; padding-left: var(--sp-3); background: rgba(255, 255, 255, .09); --fg: var(--stage-fg); }
.vs .lang-pick select { font-size: 13px; font-weight: 600; }

.vs-diff { padding: 0 20px var(--sp-1); border-top: .5px solid var(--stage-line); }

.vs-table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
  font-size: 14px;
  line-height: 1.6;
  letter-spacing: .005em;
}
.vs-table th, .vs-table td {
  padding: 9px var(--sp-3) 9px 0;
  text-align: left;
  vertical-align: top;
  overflow-wrap: anywhere;
}
.vs-table thead th { padding-block: var(--sp-3) var(--sp-2); color: var(--c); font-size: 13px; font-weight: 600; }
.vs-table tbody tr { border-top: .5px solid var(--stage-line); }
.vs-table th:first-child { width: 24%; }
.vs-table tbody th { color: var(--stage-fg-2); font-weight: 500; }
.vs-table tr.is-same td { color: var(--stage-fg-2); }

.same-tag { display: inline-flex; align-items: center; gap: 3px; margin-right: var(--sp-2); color: var(--dk-res); font-size: 13px; font-weight: 600; }

.vs-note { margin: 0; padding: var(--sp-3) 20px 0; color: var(--stage-fg-2); font-size: 14px; line-height: 1.65; }

.vs-take {
  display: flex;
  gap: var(--sp-2);
  margin: 0;
  padding: var(--sp-3) 20px var(--sp-4);
  border-top: .5px solid var(--stage-line);
  font-size: 15px;
  line-height: 1.7;
  letter-spacing: .005em;
  text-wrap: pretty;
}
.vs-take svg { margin-top: .32em; color: #ffd60a; }

@container vs (min-width: 600px) {
  .vs-code { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .vs-other { border-top: 0; border-left: .5px solid var(--stage-line); }
}

@container vs (max-width: 519px) {
  .vs-table, .vs-table thead, .vs-table tbody { display: block; }
  .vs-table tr {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--sp-3);
    padding-block: var(--sp-2);
  }
  .vs-table thead th:first-child { display: none; }
  .vs-table th, .vs-table td, .vs-table thead th { width: auto; padding: 0; }
  .vs-table tbody th { grid-column: 1 / -1; padding-bottom: 2px; }
  .vs-table tr.is-same td { grid-column: 1 / -1; }
}

/* ---------- 对照表 ---------- */

.map { margin: 0; }
.map figcaption {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: var(--sp-2);
  font-size: 15px;
  font-weight: 600;
}
.map figcaption svg { color: var(--fg-3); }

.map-scroll { overflow-x: auto; border-radius: 14px; box-shadow: inset 0 0 0 .5px var(--line); }

.map table { width: 100%; border-collapse: collapse; font-size: 14.5px; line-height: 1.55; }
.map th, .map td { padding: 10px 14px; text-align: left; vertical-align: top; }
.map th { font-weight: 600; font-size: 13px; color: var(--c, var(--fg-2)); white-space: nowrap; }
.map tbody tr { border-top: .5px solid var(--line); }
.map tbody tr:hover { background: var(--bg-soft); }
.map tbody tr:hover code { background: var(--line); }
.map td.note-cell { color: var(--fg-2); min-width: 140px; }
.map td[data-col] { min-width: 120px; }

/* ---------- 提示 ---------- */

.note { padding: 14px 18px; border-radius: 14px; background: var(--bg-soft); font-size: 15.5px; line-height: 1.75; }
.note.warn { background: var(--warn-bg); }
.note h4 {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 0 0 2px;
  font-size: 15px;
  font-weight: 600;
}
.note.warn h4 { color: var(--warn-fg); }
.note .note-body { display: flex; flex-direction: column; gap: 10px; }
.note .code { background: var(--bg); }

.more { border-radius: 14px; box-shadow: inset 0 0 0 .5px var(--line); }
.more summary {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 11px var(--sp-4);
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  border-radius: 14px;
  transition: background .2s;
}
.more summary::-webkit-details-marker { display: none; }
.more summary:hover { background: var(--bg-soft); }
.more summary .tag { color: var(--fg-3); font-size: 13px; font-weight: 400; margin-left: auto; }
.more summary svg { color: var(--fg-3); transition: transform .3s var(--ease); }
.more[open] summary svg { transform: rotate(90deg); }
.more-body {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  padding: var(--sp-1) var(--sp-4) var(--sp-4);
  font-size: 15.5px;
  line-height: 1.75;
}

/* ---------- 章末 ---------- */

.recap {
  margin-top: var(--sp-7);
  padding: 20px var(--sp-5);
  border-radius: 18px;
  background: var(--bg-soft);
}
.recap h2 { margin: 0 0 var(--sp-2); font: 600 18px/1.3 var(--font-display); }
.recap ul { display: flex; flex-direction: column; gap: 6px; margin: 0; padding: 0; list-style: none; font-size: 15.5px; line-height: 1.65; }
.recap li { display: flex; gap: var(--sp-2); }
.recap li svg { margin-top: .36em; color: var(--ok); }
.recap code { background: var(--bg); }

.sources {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-1) var(--sp-3);
  margin: var(--sp-3) var(--sp-1) 0;
  color: var(--fg-3);
  font-size: 13.5px;
}
.sources a { display: inline-flex; align-items: center; gap: 3px; }

.pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-3);
  margin-top: var(--sp-5);
}

.pager a {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 18px;
  border-radius: 14px;
  color: var(--fg);
  box-shadow: inset 0 0 0 .5px var(--line);
  transition: background .2s;
}
.pager a:hover { background: var(--bg-soft); text-decoration: none; }
.pager a span { color: var(--fg-3); font-size: 13px; }
.pager a b { font-weight: 600; font-size: 16px; }
.pager .next { grid-column: 2; text-align: right; align-items: flex-end; }

/* ---------- 首页 ---------- */

.home { max-width: var(--home-w); margin-inline: auto; }

.hero {
  padding-block: clamp(48px, 8vw, 96px) clamp(32px, 5vw, 48px);
  text-align: center;
}

.hero h1 {
  margin: 0;
  font: 700 clamp(40px, 9vw, 88px)/1.08 var(--font-display);
  letter-spacing: -.03em;
  word-break: keep-all;
}

.hero .lede {
  max-width: 620px;
  margin: var(--sp-4) auto 0;
  font-size: clamp(18px, 2.2vw, 21px);
  line-height: 1.6;
  text-wrap: balance;
}

.cta { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--sp-3); margin-top: 28px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 44px;
  padding: 0 22px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 500;
  white-space: nowrap;
  transition: background .2s, transform .3s var(--ease);
}
.btn:hover { text-decoration: none; }
.btn:active { transform: scale(.97); }
.btn.primary { background: #0066cc; color: #ffffff; }
.btn.primary:hover { background: #0058b0; }
.btn.quiet { color: var(--accent-ink); box-shadow: inset 0 0 0 1px var(--accent-ink); }
.btn.quiet:hover { background: var(--accent-soft); }

.hero-meta { margin: var(--sp-4) 0 0; color: var(--fg-3); font-size: 14px; }

.parts {
  display: flex;
  flex-direction: column;
  gap: var(--sp-6);
  padding-block: clamp(48px, 7vw, 72px) var(--sp-6);
}

.part h2 {
  margin: 0 0 var(--sp-3);
  font: 600 22px/1.3 var(--font-display);
  letter-spacing: -.012em;
}

.toc { margin: 0; padding: 0; list-style: none; border-radius: 18px; background: var(--bg-soft); overflow: hidden; }

.toc a {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr) auto 14px;
  align-items: center;
  gap: 0 var(--sp-3);
  padding: 13px var(--sp-4) 13px 18px;
  color: var(--fg);
  transition: background .2s;
}
.toc a:hover { background: var(--hover); text-decoration: none; }
.toc li + li a { box-shadow: inset 0 .5px 0 var(--line); }
.toc svg { color: var(--fg-3); font-size: 14px; }

.toc-no { color: var(--fg-3); font-size: 15px; font-variant-numeric: tabular-nums; }
.toc-text { min-width: 0; }
.toc-text b { display: block; font-size: 17px; font-weight: 600; line-height: 1.4; }
.toc-text span { display: block; color: var(--fg-2); font-size: 14.5px; line-height: 1.55; text-wrap: pretty; }
.toc-text code { background: var(--bg); }
.toc-meta { display: inline-flex; align-items: center; gap: 3px; color: var(--fg-3); font-size: 13px; white-space: nowrap; }
.toc-meta.is-done { color: var(--ok); }
.toc-meta.is-done svg { color: inherit; }

.foot {
  padding-block: var(--sp-5) var(--sp-6);
  border-top: .5px solid var(--line);
  color: var(--fg-3);
  font-size: 13px;
  line-height: 1.6;
}

/* ---------- 速查页 ---------- */

.sheet-filter {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  height: 42px;
  margin-top: var(--sp-3);
  padding-inline: 14px;
  border-radius: 12px;
  background: var(--bg-soft);
  color: var(--fg-3);
}
.sheet-filter input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--fg);
  font: inherit;
  font-size: 16px;
}
.sheet-filter input::placeholder { color: var(--fg-3); }

.sheet-group { display: flex; flex-direction: column; gap: var(--sp-4); }
.sheet-group > h2 { margin: var(--sp-5) 0 0; font: 600 22px/1.25 var(--font-display); letter-spacing: -.012em; }
.sheet-group > h2 a { color: inherit; }
.sheet-empty { color: var(--fg-2); text-align: center; padding-block: var(--sp-6); }

/* ---------- 搜索面板 ---------- */

.spot {
  width: min(640px, calc(100vw - 32px));
  max-width: none;
  max-height: none;
  margin: min(14vh, 96px) auto auto;
  padding: 0;
  border: 0;
  background: transparent;
  overflow: visible;
}
.spot::backdrop { background: rgba(0, 0, 0, .26); }
.spot[open] .spot-box { animation: spot-in .26s var(--ease); }

@keyframes spot-in { from { opacity: 0; transform: scale(.97); } }

.spot-box {
  display: flex;
  flex-direction: column;
  max-height: min(70vh, 560px);
  border-radius: 18px;
  background: var(--glass);
  -webkit-backdrop-filter: saturate(180%) blur(36px);
  backdrop-filter: saturate(180%) blur(36px);
  box-shadow: var(--shadow-pop);
  overflow: hidden;
}

.spot-field {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-bottom: .5px solid var(--line);
  color: var(--fg-2);
  font-size: 20px;
}
.spot-field input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--fg);
  font: 400 19px/1.3 var(--font-sans);
}
.spot-field input::placeholder { color: var(--fg-3); }

.spot-list { flex: 1; overflow-y: auto; scrollbar-width: thin; padding: 6px; }

.spot-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 0 10px;
  padding: 7px var(--sp-3);
  border-radius: 10px;
  color: var(--fg);
  cursor: pointer;
}
.spot-item:hover { text-decoration: none; }
.spot-item.is-on { background: #0066cc; color: #ffffff; }
.spot-kind { grid-row: span 2; color: var(--fg-3); font-size: 12.5px; line-height: 22px; }
.spot-title { font-size: 15px; line-height: 22px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.spot-sub { color: var(--fg-2); font-size: 13px; line-height: 18px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.spot-item.is-on .spot-kind, .spot-item.is-on .spot-sub { color: rgba(255, 255, 255, .85); }
.spot-item mark { background: none; color: inherit; font-weight: 700; }
.spot-none { padding: 28px var(--sp-4); color: var(--fg-2); text-align: center; font-size: 15px; }

.spot-foot {
  display: flex;
  gap: var(--sp-4);
  padding: var(--sp-2) 18px;
  border-top: .5px solid var(--line);
  color: var(--fg-3);
  font-size: 12.5px;
}
.spot-foot kbd { margin-right: 3px; }

/* ---------- 窄屏 ---------- */

@media (max-width: 960px) {
  .shell, :root[data-side="closed"] .shell { grid-template-columns: minmax(0, 1fr); }

  .side, :root[data-side="closed"] .side, :root[data-view="home"] .side {
    display: block;
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 50;
    width: min(320px, 86vw);
    height: auto;
    padding-top: calc(var(--sp-4) + var(--safe-top));
    padding-left: max(var(--sp-3), env(safe-area-inset-left, 0px));
    background: var(--bg);
    transform: translateX(-102%);
    visibility: hidden;
    transition: transform .36s var(--ease), visibility .36s;
  }

  :root[data-drawer="open"] .side { transform: none; visibility: visible; }

  .scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 40;
    background: rgba(0, 0, 0, .34);
    opacity: 0;
    pointer-events: none;
    transition: opacity .3s;
  }
  :root[data-drawer="open"] .scrim { opacity: 1; pointer-events: auto; }
}

@media (min-width: 961px) {
  :root[data-view="home"] #side-toggle { display: none; }
}

@media (max-width: 620px) {
  body { font-size: 16.5px; }
  .bar .lang-pick, .search-text, .search-pill kbd { display: none; }
  .search-pill { width: 34px; padding: 0; justify-content: center; background: transparent; font-size: 18px; }
  .vs { border-radius: 18px; }
  .vs-title, .vs-intro, .vs-diff, .vs-note, .vs-take { padding-inline: var(--sp-4); }
  .vs-bar { padding-left: var(--sp-4); }
  .vs-pane pre { padding-inline: var(--sp-4); }
  .map table { font-size: 13.5px; }
  .map th, .map td { padding: var(--sp-2) 10px; overflow-wrap: anywhere; }
  .map td[data-col], .map td.note-cell { min-width: 0; }
  .recap { padding: 18px var(--sp-4); }
  .toc a { grid-template-columns: 22px minmax(0, 1fr) 14px; }
  .toc-meta { display: none; }
  .pager { grid-template-columns: minmax(0, 1fr); }
  .pager .next { grid-column: auto; }
  .spot-foot { display: none; }
  .btn { height: 42px; padding: 0 18px; font-size: 15.5px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  ::view-transition-group(*), ::view-transition-old(*), ::view-transition-new(*) { animation: none !important; }
  @view-transition { navigation: none; }
}

[data-lang="python"],[data-col="python"]{--c:light-dark(#2f6ea5,#6db5f2)}
[data-lang="java"],[data-col="java"]{--c:light-dark(#b85c00,#ffa94d)}
[data-lang="kotlin"],[data-col="kotlin"]{--c:light-dark(#6b46e5,#b79bff)}