@charset "utf-8";
/* ==========================================================================
   新澳数据观察 - 站点主样式
   设计令牌来自 dataviz 参考调色板（已通过 CVD / 对比度校验）
   ========================================================================== */

:root {
  color-scheme: light;

  /* 平面与墨色 */
  --surface-1:      #fcfcfb;
  --page-plane:     #f9f9f7;
  --text-primary:   #0b0b0b;
  --text-secondary: #52514e;
  --text-muted:     #898781;
  --gridline:       #e1e0d9;
  --baseline:       #c3c2b7;
  --hairline:       rgba(11, 11, 11, .10);

  /* 系列色（固定顺序，不循环） */
  --series-1: #2a78d6;  /* blue   */
  --series-2: #eb6834;  /* orange */
  --series-3: #1baf7a;  /* aqua   */
  --series-4: #eda100;  /* yellow */

  /* 顺序色阶（蓝，浅→深） */
  --seq-100: #cde2fb;
  --seq-250: #86b6ef;
  --seq-400: #3987e5;
  --seq-550: #1c5cab;
  --seq-700: #0d366b;

  /* 状态色（固定，永不主题化） */
  --status-good:     #0ca30c;
  --status-warning:  #fab219;
  --status-serious:  #ec835a;
  --status-critical: #d03b3b;

  --accent: var(--series-1);

  /* 排版与节奏 */
  --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
               "Noto Sans CJK SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas,
               "Courier New", monospace;

  --measure: 74ch;
  --wrap: 1180px;
  --radius: 4px;
  --radius-lg: 8px;

  --shadow-1: 0 1px 2px rgba(11, 11, 11, .05), 0 2px 8px rgba(11, 11, 11, .04);
  --shadow-2: 0 4px 12px rgba(11, 11, 11, .08), 0 12px 32px rgba(11, 11, 11, .08);
}

@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --surface-1:      #1a1a19;
    --page-plane:     #0d0d0d;
    --text-primary:   #ffffff;
    --text-secondary: #c3c2b7;
    --text-muted:     #898781;
    --gridline:       #2c2c2a;
    --baseline:       #383835;
    --hairline:       rgba(255, 255, 255, .10);
    --series-1: #3987e5;
    --series-2: #d95926;
    --series-3: #199e70;
    --series-4: #c98500;
    --seq-100: #184f95;
    --seq-250: #1c5cab;
    --seq-400: #3987e5;
    --seq-550: #86b6ef;
    --seq-700: #cde2fb;
    --shadow-1: 0 1px 2px rgba(0, 0, 0, .4), 0 2px 8px rgba(0, 0, 0, .3);
    --shadow-2: 0 4px 12px rgba(0, 0, 0, .5), 0 12px 32px rgba(0, 0, 0, .4);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --surface-1:      #1a1a19;
  --page-plane:     #0d0d0d;
  --text-primary:   #ffffff;
  --text-secondary: #c3c2b7;
  --text-muted:     #898781;
  --gridline:       #2c2c2a;
  --baseline:       #383835;
  --hairline:       rgba(255, 255, 255, .10);
  --series-1: #3987e5;
  --series-2: #d95926;
  --series-3: #199e70;
  --series-4: #c98500;
  --seq-100: #184f95;
  --seq-250: #1c5cab;
  --seq-400: #3987e5;
  --seq-550: #86b6ef;
  --seq-700: #cde2fb;
  --shadow-1: 0 1px 2px rgba(0, 0, 0, .4), 0 2px 8px rgba(0, 0, 0, .3);
  --shadow-2: 0 4px 12px rgba(0, 0, 0, .5), 0 12px 32px rgba(0, 0, 0, .4);
}

/* --------------------------------------------------------------- 基础重置 */

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-primary);
  background: var(--page-plane);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg, canvas, video { max-width: 100%; height: auto; display: block; }
table { border-collapse: collapse; }

a {
  color: var(--accent);
  text-decoration: none;
  text-underline-offset: .18em;
}
a:hover, a:focus-visible { text-decoration: underline; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  margin: -1px; padding: 0; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}

.skip-link {
  position: absolute; top: -100%; left: 1rem; z-index: 999;
  padding: .6rem 1rem; border-radius: var(--radius);
  background: var(--accent); color: #fff; font-weight: 600;
}
.skip-link:focus { top: 1rem; }

/* ------------------------------------------------------------------ 布局 */

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

.layout {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.75rem);
  align-items: start;
  grid-template-columns: minmax(0, 1fr);
  padding-block: clamp(1.5rem, 4vw, 2.75rem);
}
@media (min-width: 62rem) {
  .layout--sidebar { grid-template-columns: minmax(0, 1fr) 20rem; }
  .layout--toc     { grid-template-columns: 15rem minmax(0, 1fr); }
}

.stack > * + * { margin-top: var(--stack-gap, 1.25rem); }

/* ---------------------------------------------------------------- 页头 */

.site-header {
  position: sticky; top: 0; z-index: 90;
  background: color-mix(in srgb, var(--surface-1) 88%, transparent);
  backdrop-filter: saturate(1.6) blur(10px);
  border-bottom: 1px solid var(--hairline);
}

.site-header__bar {
  display: flex; align-items: center; gap: 1rem;
  min-height: 4rem;
}

.brand { display: flex; align-items: center; gap: .6rem; flex: 0 0 auto; }
.brand__mark {
  width: 2rem; height: 2rem; flex: 0 0 auto;
  border-radius: var(--radius);
  background: linear-gradient(140deg, var(--seq-400), var(--seq-700));
  display: grid; place-items: center;
  color: #fff; font-size: .8rem; font-weight: 700; letter-spacing: -.02em;
}
.brand__text { display: flex; flex-direction: column; line-height: 1.2; }
.brand__name {
  font-size: 1.02rem; font-weight: 700; color: var(--text-primary);
  letter-spacing: -.01em;
}
.brand__tag { font-size: .72rem; color: var(--text-muted); }

.nav { margin-left: auto; }
.nav__list {
  display: flex; align-items: center; gap: .15rem;
  list-style: none; margin: 0; padding: 0;
}
.nav__link {
  display: block; padding: .45rem .7rem;
  border-radius: var(--radius);
  font-size: .9rem; font-weight: 500;
  color: var(--text-secondary);
}
.nav__link:hover { background: var(--page-plane); color: var(--text-primary); text-decoration: none; }
/* "page" = 就是当前页（分区首页）；"true" = 当前页所属的分区（文章页、工具页） */
.nav__link[aria-current="page"],
.nav__link[aria-current="true"] { color: var(--accent); font-weight: 600; }

.icon-btn {
  display: grid; place-items: center;
  width: 2.25rem; height: 2.25rem;
  border: 1px solid var(--hairline); border-radius: var(--radius);
  background: var(--surface-1); color: var(--text-secondary);
  cursor: pointer; font-size: 1rem; line-height: 1;
}
.icon-btn:hover { color: var(--text-primary); border-color: var(--baseline); }

.nav-toggle { display: none; }
@media (max-width: 61.999rem) {
  .nav-toggle { display: grid; }
  .nav {
    position: absolute; inset: 4rem 0 auto; z-index: 80;
    display: none;
    background: var(--surface-1);
    border-bottom: 1px solid var(--hairline);
    box-shadow: var(--shadow-1);
  }
  .nav[data-open="true"] { display: block; }
  .nav__list {
    flex-direction: column; align-items: stretch; gap: 0;
    padding: .5rem clamp(1rem, 4vw, 2rem) 1rem;
  }
  .nav__link { padding: .7rem .25rem; border-bottom: 1px solid var(--hairline); }
}

/* -------------------------------------------------------- 面包屑 / 标题 */

.breadcrumb { padding-top: 1rem; font-size: .82rem; color: var(--text-muted); }
.breadcrumb ol {
  display: flex; flex-wrap: wrap; align-items: center; gap: .4rem;
  list-style: none; margin: 0; padding: 0;
}
.breadcrumb li + li::before { content: "/"; margin-right: .4rem; color: var(--baseline); }
.breadcrumb a { color: var(--text-secondary); }

.page-head { padding-block: clamp(1.25rem, 3vw, 2rem) 0; }
.eyebrow {
  display: inline-block; margin: 0 0 .5rem;
  font-size: .74rem; font-weight: 700; letter-spacing: .1em;
  text-transform: uppercase; color: var(--accent);
}
.page-title {
  margin: 0; font-size: clamp(1.6rem, 4vw, 2.4rem);
  line-height: 1.25; letter-spacing: -.02em; font-weight: 700;
}
.page-sub {
  margin: .75rem 0 0; max-width: var(--measure);
  font-size: 1.02rem; color: var(--text-secondary);
}
.page-meta {
  display: flex; flex-wrap: wrap; gap: .4rem 1rem;
  margin-top: 1rem; font-size: .8rem; color: var(--text-muted);
}

/* ---------------------------------------------------------------- 卡片 */

.card {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: clamp(1.1rem, 2.5vw, 1.6rem);
}
.card--flush { padding: 0; overflow: hidden; }
.card__title { margin: 0 0 .5rem; font-size: 1.05rem; font-weight: 700; letter-spacing: -.01em; }
.card__body { margin: 0; font-size: .92rem; color: var(--text-secondary); }

.grid { display: grid; gap: 1rem; }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 11rem), 1fr)); }

/* 文章卡 */
.post-card {
  display: flex; flex-direction: column; gap: .55rem;
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 1.15rem 1.25rem;
  transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.post-card:hover {
  border-color: color-mix(in srgb, var(--accent) 40%, var(--hairline));
  transform: translateY(-2px);
  box-shadow: var(--shadow-1);
}
.post-card__kicker {
  font-size: .72rem; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--text-muted);
}
.post-card__title { margin: 0; font-size: 1.06rem; font-weight: 700; line-height: 1.4; letter-spacing: -.01em; }
.post-card__title a { color: var(--text-primary); }
.post-card__title a:hover { color: var(--accent); text-decoration: none; }
.post-card__excerpt {
  margin: 0; font-size: .9rem; color: var(--text-secondary);
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.post-card__foot {
  display: flex; flex-wrap: wrap; gap: .35rem .8rem;
  margin-top: auto; padding-top: .35rem;
  font-size: .76rem; color: var(--text-muted);
}

/* 标签 */
.tag {
  display: inline-block; padding: .12rem .5rem;
  border: 1px solid var(--hairline); border-radius: 999px;
  font-size: .72rem; color: var(--text-secondary); background: var(--page-plane);
}
.tag-list { display: flex; flex-wrap: wrap; gap: .4rem; list-style: none; margin: 0; padding: 0; }

/* ------------------------------------------------------------ 正文排版 */

.prose { max-width: var(--measure); }
.prose > * + * { margin-top: 1.1em; }

.prose h2 {
  margin-top: 2.4em; margin-bottom: .6em;
  padding-bottom: .35em;
  border-bottom: 1px solid var(--gridline);
  font-size: 1.45rem; line-height: 1.35; letter-spacing: -.015em; font-weight: 700;
}
.prose h3 {
  margin-top: 1.9em; margin-bottom: .4em;
  font-size: 1.14rem; line-height: 1.45; letter-spacing: -.01em; font-weight: 700;
}
.prose h4 { margin-top: 1.5em; margin-bottom: .3em; font-size: 1rem; font-weight: 700; }
.prose p  { margin-block: 0; }
.prose ul, .prose ol { margin-block: 0; padding-left: 1.4em; }
.prose li + li { margin-top: .4em; }
.prose li::marker { color: var(--text-muted); }
.prose strong { font-weight: 700; color: var(--text-primary); }
.prose hr { margin-block: 2.5em; border: 0; border-top: 1px solid var(--gridline); }

.prose blockquote {
  margin: 1.6em 0; padding: .2em 0 .2em 1.1em;
  border-left: 3px solid var(--seq-250);
  color: var(--text-secondary); font-style: normal;
}
.prose blockquote p + p { margin-top: .7em; }

.prose code {
  padding: .12em .38em;
  border-radius: 3px;
  background: color-mix(in srgb, var(--text-primary) 6%, transparent);
  font-family: var(--font-mono); font-size: .875em;
}
.prose pre {
  overflow-x: auto; padding: 1rem 1.1rem;
  border: 1px solid var(--hairline); border-radius: var(--radius-lg);
  background: var(--surface-1);
  font-family: var(--font-mono); font-size: .84rem; line-height: 1.6;
}
.prose pre code { padding: 0; background: none; font-size: inherit; }

.prose figure { margin: 1.8em 0; }
.prose figcaption {
  margin-top: .6em; font-size: .8rem; color: var(--text-muted); line-height: 1.6;
}

/* 行内公式块 */
.formula {
  margin: 1.6em 0; padding: 1rem 1.2rem;
  border: 1px solid var(--hairline); border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  background: var(--surface-1);
  font-family: var(--font-mono); font-size: .95rem;
  overflow-x: auto; text-align: center;
}
.formula__note {
  display: block; margin-top: .6rem;
  font-family: var(--font-sans); font-size: .8rem; color: var(--text-muted); text-align: left;
}

/* 提示框 */
.callout {
  margin: 1.8em 0; padding: 1rem 1.15rem;
  border: 1px solid var(--hairline); border-radius: var(--radius-lg);
  background: var(--surface-1);
  border-left: 3px solid var(--baseline);
  font-size: .93rem;
}
.callout > * + * { margin-top: .6em; }
.callout__title {
  display: flex; align-items: center; gap: .45rem;
  margin: 0; font-size: .88rem; font-weight: 700; letter-spacing: .01em;
}
.callout__title::before { font-size: 1rem; line-height: 1; }
.callout p { margin: 0; color: var(--text-secondary); }
.callout--key      { border-left-color: var(--accent); }
.callout--key .callout__title { color: var(--accent); }
.callout--key .callout__title::before { content: "◆"; }
.callout--warn     { border-left-color: var(--status-critical); }
.callout--warn .callout__title { color: var(--status-critical); }
.callout--warn .callout__title::before { content: "⚠"; }
.callout--note     { border-left-color: var(--series-3); }
.callout--note .callout__title { color: var(--series-3); }
.callout--note .callout__title::before { content: "✦"; }

/* ---------------------------------------------------------------- 表格 */

.table-wrap {
  margin: 1.8em 0; overflow-x: auto;
  border: 1px solid var(--hairline); border-radius: var(--radius-lg);
  background: var(--surface-1);
}
table.data {
  width: 100%; min-width: 30rem;
  font-size: .88rem;
}
table.data caption {
  padding: .85rem 1rem; text-align: left;
  font-size: .82rem; font-weight: 600; color: var(--text-secondary);
  border-bottom: 1px solid var(--hairline);
}
table.data th, table.data td {
  padding: .6rem .9rem; text-align: left;
  border-bottom: 1px solid var(--gridline);
}
table.data thead th {
  font-size: .78rem; font-weight: 700; letter-spacing: .02em;
  color: var(--text-secondary); background: var(--page-plane);
  white-space: nowrap;
}
table.data tbody tr:last-child td { border-bottom: 0; }
table.data td.num, table.data th.num {
  text-align: right; font-variant-numeric: tabular-nums;
}
table.data tbody tr:hover td { background: color-mix(in srgb, var(--accent) 4%, transparent); }

/* --------------------------------------------------------- 图表 / 统计 */

.viz {
  margin: 1.8em 0; padding: 1.1rem 1.2rem 1rem;
  background: var(--surface-1);
  border: 1px solid var(--hairline); border-radius: var(--radius-lg);
}
.viz__head { margin-bottom: .9rem; }
.viz__title { margin: 0; font-size: .98rem; font-weight: 700; letter-spacing: -.005em; }
.viz__sub { margin: .25rem 0 0; font-size: .8rem; color: var(--text-muted); }
.viz__plot { position: relative; }
.viz__plot svg { width: 100%; height: auto; overflow: visible; }
.viz__foot {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: .5rem 1rem; margin-top: .8rem;
  font-size: .78rem; color: var(--text-muted);
}

/* 图例 —— ≥2 series 必备 */
.legend { display: flex; flex-wrap: wrap; gap: .3rem 1rem; list-style: none; margin: 0; padding: 0; }
.legend li { display: flex; align-items: center; gap: .4rem; font-size: .8rem; color: var(--text-secondary); }
.legend .swatch {
  width: .7rem; height: .7rem; flex: 0 0 auto; border-radius: 2px;
}
.legend .swatch--line { height: 2px; width: 1rem; border-radius: 1px; }

/* 图表几何 */
.grid-line   { stroke: var(--gridline); stroke-width: 1; shape-rendering: crispEdges; }
.axis-line   { stroke: var(--baseline); stroke-width: 1; shape-rendering: crispEdges; }
.axis-label  { fill: var(--text-muted); font-size: 11px; font-variant-numeric: tabular-nums; }
.series-line { fill: none; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.ref-line    { stroke: var(--text-secondary); stroke-width: 2; }
.bar-mark    { }
.dot-mark    { stroke: var(--surface-1); stroke-width: 2; }

/* 提示浮层 */
.tooltip {
  position: absolute; z-index: 20; pointer-events: none;
  min-width: 6rem; padding: .5rem .65rem;
  border: 1px solid var(--hairline); border-radius: var(--radius);
  background: var(--surface-1); box-shadow: var(--shadow-2);
  font-size: .8rem; line-height: 1.5;
  opacity: 0; transform: translate(-50%, -110%); transition: opacity .1s ease;
}
.tooltip[data-show="true"] { opacity: 1; }
.tooltip__k { color: var(--text-muted); }
.tooltip__v { font-weight: 700; font-variant-numeric: tabular-nums; }

/* 统计块 */
.stat {
  padding: 1rem 1.1rem;
  background: var(--surface-1);
  border: 1px solid var(--hairline); border-radius: var(--radius-lg);
}
.stat__label {
  margin: 0 0 .35rem; font-size: .78rem; font-weight: 600;
  letter-spacing: .02em; color: var(--text-secondary);
}
.stat__value {
  margin: 0; font-size: clamp(1.5rem, 4vw, 1.95rem);
  font-weight: 700; letter-spacing: -.03em; line-height: 1.1;
  color: var(--text-primary);
}
.stat__value small { font-size: .5em; font-weight: 600; color: var(--text-muted); letter-spacing: 0; }
.stat__note { margin: .4rem 0 0; font-size: .76rem; color: var(--text-muted); line-height: 1.5; }
.stat--accent .stat__value { color: var(--accent); }
.stat--critical .stat__value { color: var(--status-critical); }

/* 表格视图切换（每图必备的可访问孪生） */
.viz__switch {
  display: inline-flex; gap: 0;
  border: 1px solid var(--hairline); border-radius: var(--radius); overflow: hidden;
}
.viz__switch button {
  padding: .3rem .7rem; border: 0; cursor: pointer;
  background: var(--surface-1); color: var(--text-secondary);
  font-family: inherit; font-size: .76rem; font-weight: 600;
}
.viz__switch button + button { border-left: 1px solid var(--hairline); }
.viz__switch button[aria-pressed="true"] { background: var(--accent); color: #fff; }
[hidden] { display: none !important; }

/* ------------------------------------------------------------- 控件行 */

.controls {
  display: flex; flex-wrap: wrap; align-items: flex-end; gap: .9rem 1.2rem;
  margin-bottom: 1.2rem; padding: 1rem 1.1rem;
  background: var(--surface-1);
  border: 1px solid var(--hairline); border-radius: var(--radius-lg);
}
.field { display: flex; flex-direction: column; gap: .3rem; min-width: 9rem; }
.field__label { font-size: .78rem; font-weight: 600; color: var(--text-secondary); }
.field input, .field select {
  padding: .45rem .6rem;
  border: 1px solid var(--baseline); border-radius: var(--radius);
  background: var(--page-plane); color: var(--text-primary);
  font-family: inherit; font-size: .9rem;
}
.field input[type="range"] { padding: 0; border: 0; background: none; accent-color: var(--accent); }
.field__hint { font-size: .74rem; color: var(--text-muted); font-variant-numeric: tabular-nums; }

.btn {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .5rem .95rem; border: 1px solid transparent; border-radius: var(--radius);
  background: var(--accent); color: #fff;
  font-family: inherit; font-size: .88rem; font-weight: 600; cursor: pointer;
}
.btn:hover { background: var(--seq-550); text-decoration: none; }
.btn--ghost {
  background: var(--surface-1); color: var(--text-primary); border-color: var(--baseline);
}
.btn--ghost:hover { background: var(--page-plane); }

/* ------------------------------------------------------------ 目录 TOC */

.toc {
  position: sticky; top: 5rem;
  padding: 1rem 1.1rem;
  background: var(--surface-1);
  border: 1px solid var(--hairline); border-radius: var(--radius-lg);
  font-size: .86rem;
}
.toc__title {
  margin: 0 0 .6rem; font-size: .74rem; font-weight: 700;
  letter-spacing: .1em; text-transform: uppercase; color: var(--text-muted);
}
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc li + li { margin-top: .1rem; }
.toc a {
  display: block; padding: .3rem .5rem; border-radius: var(--radius);
  color: var(--text-secondary); line-height: 1.45;
}
.toc a:hover { background: var(--page-plane); color: var(--text-primary); text-decoration: none; }
.toc a[aria-current="true"] {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--accent); font-weight: 600;
}
.toc ol ol { padding-left: .7rem; }
@media (max-width: 61.999rem) { .toc { position: static; } }

/* ------------------------------------------------------------ 侧栏模块 */

.aside-mod + .aside-mod { margin-top: 1rem; }
.aside-mod__title {
  margin: 0 0 .7rem; font-size: .74rem; font-weight: 700;
  letter-spacing: .1em; text-transform: uppercase; color: var(--text-muted);
}
.link-list { list-style: none; margin: 0; padding: 0; font-size: .89rem; }
.link-list li + li { margin-top: .55rem; padding-top: .55rem; border-top: 1px solid var(--gridline); }
.link-list a { color: var(--text-primary); font-weight: 500; line-height: 1.5; }
.link-list a:hover { color: var(--accent); text-decoration: none; }
.link-list .meta { display: block; margin-top: .15rem; font-size: .76rem; color: var(--text-muted); }

/* --------------------------------------------------------- 上下篇导航 */

.post-nav {
  display: grid; gap: 1rem; margin-top: 2.5rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
}
.post-nav a {
  padding: .9rem 1.1rem;
  border: 1px solid var(--hairline); border-radius: var(--radius-lg);
  background: var(--surface-1);
}
.post-nav a:hover { border-color: var(--baseline); text-decoration: none; }
.post-nav .dir { display: block; font-size: .74rem; color: var(--text-muted); margin-bottom: .2rem; }
.post-nav .t { display: block; font-size: .93rem; font-weight: 600; color: var(--text-primary); line-height: 1.5; }
.post-nav a.is-next { text-align: right; }

/* --------------------------------------------------------------- 英雄区 */

.hero { padding-block: clamp(2.25rem, 6vw, 4rem) clamp(1.5rem, 3vw, 2rem); }
.hero__inner { display: grid; gap: clamp(1.5rem, 4vw, 3rem); align-items: center; }
@media (min-width: 62rem) { .hero__inner { grid-template-columns: 1.1fr .9fr; } }
.hero__title {
  margin: 0; font-size: clamp(1.85rem, 5.2vw, 3.05rem);
  line-height: 1.18; letter-spacing: -.035em; font-weight: 700;
}
.hero__title em { font-style: normal; color: var(--accent); }
.hero__lede {
  margin: 1.1rem 0 0; max-width: 46ch;
  font-size: clamp(1rem, 2vw, 1.12rem); color: var(--text-secondary);
}
.hero__actions { display: flex; flex-wrap: wrap; gap: .7rem; margin-top: 1.6rem; }
.hero__facts {
  display: flex; flex-wrap: wrap; gap: .5rem 1.5rem;
  margin: 1.75rem 0 0; padding: 1rem 0 0;
  border-top: 1px solid var(--gridline); list-style: none;
  font-size: .82rem; color: var(--text-muted);
}

/* --------------------------------------------------- 章节标题（首页） */

.section { padding-block: clamp(1.75rem, 4vw, 2.75rem); }
.section__head {
  display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between;
  gap: .5rem 1rem; margin-bottom: 1.25rem;
  padding-bottom: .6rem; border-bottom: 1px solid var(--gridline);
}
.section__title { margin: 0; font-size: clamp(1.2rem, 3vw, 1.5rem); font-weight: 700; letter-spacing: -.02em; }
.section__more { font-size: .86rem; font-weight: 600; }

/* ---------------------------------------------------------------- 页脚 */

.site-footer {
  margin-top: clamp(2.5rem, 6vw, 4rem);
  padding-block: clamp(2rem, 5vw, 3rem) 1.5rem;
  border-top: 1px solid var(--hairline);
  background: var(--surface-1);
  font-size: .88rem;
}
.footer-grid {
  display: grid; gap: 1.75rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 1fr));
}
.footer-col__title {
  margin: 0 0 .7rem; font-size: .76rem; font-weight: 700;
  letter-spacing: .1em; text-transform: uppercase; color: var(--text-muted);
}
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li + li { margin-top: .45rem; }
.footer-col a { color: var(--text-secondary); }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  display: flex; flex-wrap: wrap; gap: .5rem 1.5rem;
  margin-top: 2rem; padding-top: 1.25rem;
  border-top: 1px solid var(--gridline);
  font-size: .8rem; color: var(--text-muted);
}
.footer-disclaimer {
  margin: 1.25rem 0 0; padding: .9rem 1.05rem;
  border: 1px solid var(--hairline); border-left: 3px solid var(--status-critical);
  border-radius: var(--radius);
  background: var(--page-plane);
  font-size: .82rem; line-height: 1.7; color: var(--text-secondary);
}
.footer-disclaimer strong { color: var(--text-primary); }

/* ==================================================== 右下角理性提示卡 */

.rational-dock {
  position: fixed; right: clamp(.75rem, 2vw, 1.5rem); bottom: clamp(.75rem, 2vw, 1.5rem);
  z-index: 100; width: min(21rem, calc(100vw - 1.5rem));
  display: flex; flex-direction: column; align-items: flex-end; gap: .5rem;
  pointer-events: none;
}
.rational-dock > * { pointer-events: auto; }

.rational-card {
  width: 100%;
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2);
  overflow: hidden;
  opacity: 0; transform: translateY(14px) scale(.98);
  transition: opacity .28s ease, transform .28s cubic-bezier(.16, 1, .3, 1);
}
.rational-card[data-open="true"] { opacity: 1; transform: none; }
.rational-card[hidden] { display: none; }

.rational-card__head {
  display: flex; align-items: center; gap: .5rem;
  padding: .7rem .85rem;
  border-bottom: 1px solid var(--hairline);
  background: var(--page-plane);
}
.rational-card__badge {
  display: inline-grid; place-items: center;
  width: 1.35rem; height: 1.35rem; flex: 0 0 auto;
  border-radius: 3px; background: var(--accent); color: #fff;
  font-size: .7rem; font-weight: 700;
}
.rational-card__title {
  margin: 0; font-size: .85rem; font-weight: 700; letter-spacing: -.005em;
  color: var(--text-primary);
}
.rational-card__close {
  margin-left: auto; flex: 0 0 auto;
  width: 1.5rem; height: 1.5rem;
  display: grid; place-items: center;
  border: 0; border-radius: 3px; cursor: pointer;
  background: transparent; color: var(--text-muted);
  font-size: 1rem; line-height: 1;
}
.rational-card__close:hover { background: var(--gridline); color: var(--text-primary); }

.rational-card__body { padding: .85rem .95rem .95rem; }
.rational-card__fact {
  margin: 0; font-size: .88rem; line-height: 1.65; color: var(--text-primary);
}
.rational-card__fact b { color: var(--accent); font-variant-numeric: tabular-nums; }
.rational-card__src { margin: .55rem 0 0; font-size: .74rem; color: var(--text-muted); }
.rational-card__actions {
  display: flex; align-items: center; gap: .5rem; margin-top: .85rem;
}
.rational-card__actions .btn { padding: .35rem .7rem; font-size: .78rem; }
.rational-card__counter {
  margin-left: auto; font-size: .72rem; color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.rational-fab {
  display: none;
  align-items: center; gap: .4rem;
  padding: .55rem .85rem;
  border: 1px solid var(--hairline); border-radius: 999px;
  background: var(--surface-1); color: var(--text-secondary);
  box-shadow: var(--shadow-1); cursor: pointer;
  font-family: inherit; font-size: .8rem; font-weight: 600;
}
.rational-fab[data-show="true"] { display: inline-flex; }
.rational-fab:hover { color: var(--text-primary); border-color: var(--baseline); }
.rational-fab__dot {
  width: .45rem; height: .45rem; border-radius: 50%;
  background: var(--status-good); flex: 0 0 auto;
}

/* ------------------------------------------------------------ 打印/动效 */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important; animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

@media print {
  .site-header, .rational-dock, .toc, .viz__switch, .nav-toggle { display: none !important; }
  body { background: #fff; color: #000; font-size: 11pt; }
  .card, .viz, .stat, .table-wrap { border-color: #999; break-inside: avoid; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: .85em; color: #555; }
}