/* ==========================================================================
   澳门登录 · macau-login.com.cn
   共享样式表 /assets/site.css
   版式原型：侧栏导览（深色导览轨道 + 浅底档案内容区）
   ========================================================================== */

:root {
  --color-surface: #fcfcfd;
  --color-surface-alt: #f3f3f4;
  --color-surface-deep: #e6e7e8;
  --color-ink: #454b4f;
  --color-ink-soft: #676f74;
  --color-ink-muted: #798186;
  --color-line: #dbdcde;
  --color-primary: #357da6;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e0eaf1;
  --color-accent: #d62991;
  --color-accent-ink: #ffffff;
  --color-highlight: #f5d6ea;
  --color-focus: #d61a8a;
  --color-contrast-surface: #11181b;
  --color-contrast-ink: #e4e6e7;
  --color-contrast-line: #3f4548;
  --color-contrast-accent: #db429e;
  --overlay-scrim: linear-gradient(180deg, rgba(17, 24, 27, 0.35) 0%, rgba(17, 24, 27, 0.72) 55%, rgba(17, 24, 27, 0.92) 100%);
  --font-heading: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 11.4px;
  --text-sm: 14.3px;
  --text-base: 16px;
  --text-lg: 20.0px;
  --text-xl: 25.0px;
  --text-2xl: 31.2px;
  --text-3xl: 39.1px;
  --text-4xl: 48.8px;
  --text-display: clamp(34px, 4.5vw, 58px);
  --text-figure: clamp(28px, 3.3vw, 42px);
  --weight-heading: 632;
  --weight-body: 400;
  --leading-body: 1.79;
  --leading-heading: 1.25;
  --tracking-heading: 0.0em;
  --radius-sm: 4px;
  --radius-md: 4px;
  --radius-lg: 5px;
  --radius-pill: 5px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 1px 0 rgba(69, 75, 79, 0.12);
  --shadow-2: 0 2px 0 rgba(69, 75, 79, 0.18);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1240px;
  --measure: 68ch;
  --gutter: 24px;
  --section-y: 81px;
  --section-y-lg: 113px;
}

/* --------------------------------------------------------------------------
   1. Reset
   -------------------------------------------------------------------------- */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--color-contrast-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  letter-spacing: 0.012em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, pre { margin: 0; }

ul, ol { margin: 0; padding: 0; }

li { list-style: none; }

img, svg, video, canvas { display: block; max-width: 100%; }

button, input, select, textarea { font: inherit; color: inherit; }

button { background: none; border: 0; padding: 0; cursor: pointer; }

a { color: var(--color-primary); text-decoration: none; }

a:hover { color: var(--color-focus); }

hr { border: 0; }

/* --------------------------------------------------------------------------
   2. 中文排版与标题层级
   -------------------------------------------------------------------------- */

h1, h2, h3, h4, h5, h6,
.display-title,
.section-title,
.entry-title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  text-wrap: balance;
}

p { text-wrap: pretty; }

.display-title {
  font-size: var(--text-display);
  line-height: 1.15;
  letter-spacing: -0.012em;
}

.section-title { font-size: var(--text-2xl); }

.entry-title { font-size: var(--text-lg); line-height: 1.3; }

strong, b { font-weight: var(--weight-heading); }

code, kbd, samp, .mono { font-family: var(--font-mono); font-size: 0.92em; }

/* --------------------------------------------------------------------------
   3. 焦点与跳转链接
   -------------------------------------------------------------------------- */

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

.skip-link {
  position: absolute;
  top: var(--space-1);
  left: var(--space-1);
  z-index: 200;
  transform: translateY(-200%);
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: 1px solid var(--color-contrast-accent);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  transition: transform 140ms ease-out;
}

.skip-link:focus { transform: translateY(0); color: var(--color-contrast-ink); }

#main-content:focus { outline: none; }

/* --------------------------------------------------------------------------
   4. 主体骨架：轨道 + 内容区
   -------------------------------------------------------------------------- */

.site-main {
  margin-left: 232px;
  min-height: 100vh;
  background-color: var(--color-surface);
  color: var(--color-ink);
  padding-bottom: var(--section-y-lg);
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.section { padding-block: var(--section-y); }

.section--lg { padding-block: var(--section-y-lg); }

.section--alt { background-color: var(--color-surface-alt); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
  margin-bottom: var(--space-4);
}

.section-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.section-note {
  max-width: var(--measure);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.hairline {
  border: 0;
  border-top: 1px solid var(--color-line);
  margin-block: var(--space-4);
}

.stack > * + * { margin-top: var(--space-3); }

.measure { max-width: var(--measure); }

/* --------------------------------------------------------------------------
   5. 栅格
   -------------------------------------------------------------------------- */

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}

.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-10 { grid-column: span 10; }
.col-12 { grid-column: span 12; }
.col-start-2 { grid-column-start: 2; }
.col-start-3 { grid-column-start: 3; }

/* --------------------------------------------------------------------------
   6. 导览轨道（header）
   -------------------------------------------------------------------------- */

.site-header {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 60;
  width: 232px;
  display: flex;
  flex-direction: column;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-right: 1px solid var(--color-contrast-line);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 232px;
  right: 0;
  height: 2px;
  z-index: 80;
  background-color: transparent;
  pointer-events: none;
}

.scroll-progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-color: var(--color-accent);
  transition: transform 140ms ease-out;
}

.rail-head {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-3) var(--space-3);
  border-bottom: 1px solid var(--color-contrast-line);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-contrast-ink);
  transition: color 140ms ease-out;
}

.brand:hover { color: var(--color-contrast-accent); }

.brand-mark {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid var(--color-contrast-accent);
  border-radius: var(--radius-sm);
  color: var(--color-contrast-accent);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1;
}

.brand-text { display: flex; flex-direction: column; gap: 2px; }

.brand-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.brand-line {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}

.rail-drawer {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
}

/* --------------------------------------------------------------------------
   7. 主导航
   -------------------------------------------------------------------------- */

.site-nav {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: var(--space-3);
}

.nav-caption {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-contrast-ink) 48%, transparent);
  margin-bottom: var(--space-1);
}

.nav-item { border-top: 1px solid var(--color-contrast-line); }

.nav-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: 13px 0 13px var(--space-1);
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
  transition: color 140ms ease-out, background-color 140ms ease-out;
}

.nav-link:hover {
  color: var(--color-contrast-ink);
  background-color: color-mix(in srgb, var(--color-contrast-ink) 7%, transparent);
}

.nav-index {
  flex: 0 0 auto;
  width: 2.1em;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: -0.02em;
  color: color-mix(in srgb, var(--color-contrast-ink) 50%, transparent);
}

.nav-label { font-size: var(--text-sm); letter-spacing: 0.04em; }

.nav-link[aria-current="page"] {
  color: var(--color-contrast-ink);
  font-weight: var(--weight-heading);
}

.nav-link[aria-current="page"] .nav-index { color: var(--color-contrast-accent); }

.nav-link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--space-3));
  top: 8px;
  bottom: 8px;
  width: 3px;
  background-color: var(--color-contrast-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* --------------------------------------------------------------------------
   8. 轨道底部：查询与备案
   -------------------------------------------------------------------------- */

.rail-foot {
  flex: 0 0 auto;
  margin-top: auto;
  padding: var(--space-3);
  border-top: 1px solid var(--color-contrast-line);
}

.rail-note {
  font-size: var(--text-xs);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 55%, transparent);
  margin-bottom: var(--space-2);
}

.rail-lookup { margin-bottom: var(--space-2); }

.rail-lookup-label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
  margin-bottom: 6px;
}

.rail-lookup-input {
  width: 100%;
  padding: 8px 10px;
  background-color: transparent;
  color: var(--color-contrast-ink);
  border: 1px solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  transition: border-color 140ms ease-out, background-color 140ms ease-out;
}

.rail-lookup-input::placeholder {
  color: color-mix(in srgb, var(--color-contrast-ink) 38%, transparent);
}

.rail-lookup-input:focus {
  outline: none;
  border-color: var(--color-contrast-accent);
  background-color: color-mix(in srgb, var(--color-contrast-ink) 6%, transparent);
}

.rail-lookup-input:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.rail-lookup-note {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.6;
  color: color-mix(in srgb, var(--color-contrast-ink) 52%, transparent);
}

.rail-meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 44%, transparent);
}

/* --------------------------------------------------------------------------
   9. 移动端抽屉
   -------------------------------------------------------------------------- */

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  padding: 6px 12px;
  background-color: transparent;
  border: 1px solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  transition: border-color 140ms ease-out, color 140ms ease-out;
}

.nav-toggle:hover { border-color: var(--color-contrast-accent); color: var(--color-contrast-accent); }

.nav-toggle-bar {
  position: relative;
  display: block;
  width: 14px;
  height: 2px;
  background-color: var(--color-contrast-accent);
  transition: background-color 140ms ease-out;
}

.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 14px;
  height: 2px;
  background-color: var(--color-contrast-accent);
  transition: transform 140ms ease-out, top 140ms ease-out;
}

.nav-toggle-bar::before { top: -5px; }
.nav-toggle-bar::after { top: 5px; }

.site-header[data-open="true"] .nav-toggle-bar { background-color: transparent; }
.site-header[data-open="true"] .nav-toggle-bar::before { top: 0; transform: rotate(45deg); }
.site-header[data-open="true"] .nav-toggle-bar::after { top: 0; transform: rotate(-45deg); }

/* --------------------------------------------------------------------------
   10. 按钮
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background-color 140ms ease-out, color 140ms ease-out, border-color 140ms ease-out;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.btn-primary:hover {
  background-color: color-mix(in srgb, var(--color-primary) 86%, var(--color-contrast-surface));
  color: var(--color-primary-ink);
}

.btn-accent {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.btn-accent:hover {
  background-color: var(--color-focus);
  color: var(--color-accent-ink);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-line);
}

.btn-ghost:hover {
  color: var(--color-focus);
  border-color: var(--color-focus);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

/* --------------------------------------------------------------------------
   11. 面包屑
   -------------------------------------------------------------------------- */

.breadcrumb { margin-bottom: var(--space-3); }

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.breadcrumb li { display: flex; align-items: center; gap: var(--space-1); }

.breadcrumb li + li::before {
  content: "/";
  color: var(--color-line);
}

.breadcrumb a { color: var(--color-ink-muted); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb [aria-current="page"] { color: var(--color-ink-soft); }

/* --------------------------------------------------------------------------
   12. 正文
   -------------------------------------------------------------------------- */

.prose {
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.prose > * + * { margin-top: var(--space-3); }

.prose h2 { font-size: var(--text-xl); margin-top: var(--space-6); }
.prose h3 { font-size: var(--text-lg); margin-top: var(--space-4); }

.prose ul, .prose ol { padding-left: 1.35em; }
.prose li { list-style: disc; margin-top: var(--space-1); }
.prose ol li { list-style: decimal; }

.prose a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.prose a:hover { color: var(--color-focus); }

.prose blockquote {
  padding-left: var(--space-3);
  border-left: 2px solid var(--color-primary);
  color: var(--color-ink-soft);
}

.lead {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

/* --------------------------------------------------------------------------
   13. 档案条目
   -------------------------------------------------------------------------- */

.entry {
  position: relative;
  padding: var(--space-3) 0;
  border-top: 1px solid var(--color-line);
  transition: background-color 140ms ease-out;
}

.entry:hover { background-color: var(--color-primary-soft); }

.entry.is-hit { background-color: var(--color-highlight); }

.entry.is-dim { opacity: 0.42; }

.entry-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-2);
}

.entry-code {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.entry-meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.entry-body {
  margin-top: var(--space-1);
  max-width: var(--measure);
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}

.entry-tail {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.tag-accent {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.tag-muted {
  background-color: var(--color-surface-deep);
  color: var(--color-ink-soft);
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.meta-key { color: var(--color-ink-muted); }
.meta-value { color: var(--color-ink-soft); }

/* --------------------------------------------------------------------------
   14. 二级索引与年份锚点
   -------------------------------------------------------------------------- */

.page-index {
  padding: var(--space-3);
  background-color: var(--color-surface-deep);
  border-radius: var(--radius-md);
}

.page-index-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  margin-bottom: var(--space-2);
}

.page-index-list li + li { border-top: 1px solid var(--color-line); }

.page-index-link {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: 9px 0;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  transition: color 140ms ease-out;
}

.page-index-link:hover { color: var(--color-primary); }

.page-index-link[aria-current="true"],
.page-index-link[aria-current="page"] {
  color: var(--color-accent);
  font-weight: var(--weight-heading);
}

.page-index-idx {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: -0.02em;
  color: var(--color-ink-muted);
}

.figure-num {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   15. 图形容器（页面阶段放置图片）
   -------------------------------------------------------------------------- */

.figure-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  background-color: var(--color-surface-deep);
}

.figure-frame img,
.figure-frame svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure-frame--16x9 { aspect-ratio: 16 / 9; }
.figure-frame--4x3 { aspect-ratio: 4 / 3; }
.figure-frame--1x1 { aspect-ratio: 1 / 1; }

.figure-frame--tint img {
  filter: grayscale(1) contrast(1.06);
}

.figure-frame--tint::after {
  content: "";
  position: absolute;
  inset: 0;
  background-color: color-mix(in srgb, var(--color-primary) 30%, transparent);
  mix-blend-mode: multiply;
  pointer-events: none;
}

.figure-full {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  background-color: var(--color-contrast-surface);
}

.figure-full img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1) contrast(1.05);
}

.overlay-scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}

.overlay-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: var(--space-3);
  color: var(--color-contrast-ink);
}

.overlay-caption .entry-code { color: var(--color-contrast-accent); }

.figure-caption {
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

/* --------------------------------------------------------------------------
   16. 批注与提示块
   -------------------------------------------------------------------------- */

.callout-note {
  padding: var(--space-3);
  background-color: var(--color-highlight);
  border-radius: var(--radius-md);
  max-width: var(--measure);
}

.callout-note .callout-label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  margin-bottom: var(--space-1);
}

.hand-note {
  font-family: "Kaiti SC", "STKaiti", "KaiTi", "Songti SC", "SimSun", serif;
  font-size: var(--text-lg);
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--color-ink);
}

.note-block {
  padding: var(--space-3);
  background-color: var(--color-surface-alt);
  border-radius: var(--radius-md);
  max-width: var(--measure);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* --------------------------------------------------------------------------
   17. 页脚（反色）
   -------------------------------------------------------------------------- */

.site-footer {
  margin-left: 232px;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-top: var(--space-8);
  padding-bottom: var(--space-4);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.5fr) minmax(0, 1fr);
  gap: var(--space-6) var(--space-4);
}

.footer-brand-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: 1.2;
  color: var(--color-contrast-ink);
}

.footer-brand-line {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}

.footer-tagline {
  margin-top: var(--space-2);
  max-width: 34ch;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-body);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-contrast-ink) 52%, transparent);
  padding-bottom: var(--space-1);
  border-bottom: 1px solid var(--color-contrast-line);
  margin-bottom: var(--space-2);
}

.footer-links li + li { margin-top: 2px; }

.footer-link {
  display: inline-block;
  padding: 4px 0;
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
  font-size: var(--text-sm);
  transition: color 140ms ease-out;
}

.footer-link:hover {
  color: var(--color-contrast-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-contact-list { margin-top: var(--space-1); }

.footer-contact-line {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

.footer-contact-key {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--color-contrast-ink) 48%, transparent);
}

.footer-contact-note {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 55%, transparent);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-contrast-line);
}

.footer-legal,
.footer-update {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.footer-update { max-width: 52ch; }

.back-to-top {
  margin-left: auto;
  padding: 7px 14px;
  background-color: transparent;
  border: 1px solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  transition: border-color 140ms ease-out, color 140ms ease-out;
}

.back-to-top:hover {
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-accent);
}

/* --------------------------------------------------------------------------
   18. 响应式
   -------------------------------------------------------------------------- */

@media (max-width: 1279.98px) {
  .footer-inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 1023.98px) {
  .site-header {
    position: sticky;
    inset: auto;
    top: 0;
    width: 100%;
    height: auto;
    min-height: 56px;
    flex-direction: row;
    align-items: center;
    padding: 8px var(--space-2);
    border-right: 0;
    border-bottom: 1px solid var(--color-contrast-line);
  }

  .site-header[data-scrolled="true"] {
    border-bottom-color: var(--color-contrast-accent);
  }

  .rail-head {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    width: 100%;
    padding: 0;
    border-bottom: 0;
  }

  .brand-mark { width: 28px; height: 28px; font-size: var(--text-base); }
  .brand-name { font-size: var(--text-base); }

  .nav-toggle { display: inline-flex; }

  .rail-drawer {
    position: fixed;
    inset: 56px 0 0 0;
    z-index: 70;
    display: none;
    flex-direction: column;
    overflow-y: auto;
    background-color: var(--color-contrast-surface);
    border-top: 1px solid var(--color-contrast-line);
  }

  .site-header[data-open="true"] .rail-drawer { display: flex; }

  .site-nav { flex: 0 0 auto; overflow: visible; padding: var(--space-3) var(--space-2); }

  .nav-link { padding: 14px 0; }
  .nav-label { font-size: var(--text-base); }

  .nav-link[aria-current="page"]::before { left: calc(-1 * var(--space-2)); }

  .rail-foot { padding: var(--space-3) var(--space-2) var(--space-6); }

  .scroll-progress { left: 0; }

  .site-main { margin-left: 0; padding-bottom: var(--section-y); }

  .site-footer { margin-left: 0; padding-top: var(--space-6); }

  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: var(--space-3); }

  .col-2, .col-3, .col-4 { grid-column: span 3; }
  .col-5, .col-6, .col-7, .col-8, .col-9, .col-10, .col-12 { grid-column: span 6; }
  .col-start-2, .col-start-3 { grid-column-start: auto; }
}

@media (max-width: 719.98px) {
  .section { padding-block: var(--space-6); }
  .section--lg { padding-block: var(--space-8); }

  .grid-12 { grid-template-columns: minmax(0, 1fr); }
  .col-2, .col-3, .col-4, .col-5, .col-6,
  .col-7, .col-8, .col-9, .col-10, .col-12 { grid-column: span 1; }

  .container { padding-inline: var(--space-2); }

  .display-title { font-size: clamp(30px, 8.4vw, 40px); }
  .section-title { font-size: var(--text-xl); }

  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-3); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .back-to-top { margin-left: 0; }
}

/* --------------------------------------------------------------------------
   19. 动效降级
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}