/* ==========================================================================
   加拿大PC中文站 — 共享样式 /assets/site.css
   设计主轴：堆叠面板 · 枫叶索引 · 珠宝色分区 · 等宽编号
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background-color: var(--mist);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1, h2, h3, h4, p, figure {
  margin: 0;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -.015em;
  line-height: 1.24;
  color: inherit;
}

h1 { font-size: clamp(34px, 5vw, 48px); }
h2 { font-size: clamp(26px, 3.4vw, 36px); }
h3 { font-size: clamp(20px, 2.2vw, 26px); }
h4 { font-size: 18px; }

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 品牌色 */
  --maple: #C8102E;
  --maple-deep: #8E0B20;
  --fir: #0E5A4A;
  --fir-deep: #073B30;
  --ice: #7FB7C9;
  --sand: #D9A441;
  --mist: #F5F6F2;
  --frost: #FFFFFF;
  --ink: #14201E;
  --moss: #6B7F78;
  --wine: #7A1F2B;
  --indigo: #1F3A5F;

  /* 派生 */
  --line: rgba(107, 127, 120, .28);
  --line-strong: rgba(107, 127, 120, .5);
  --shadow-card: 0 18px 40px -32px rgba(20, 32, 30, .65);
  --shadow-lift: 0 22px 48px -30px rgba(20, 32, 30, .45);

  /* 字体 */
  --font-display: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: var(--font-display);
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, "JetBrains Mono", Menlo, Consolas, "Courier New", monospace;

  /* 布局 */
  --maxw: 1200px;
  --gutter: clamp(16px, 4vw, 40px);
  --header-h: 76px;
  --radius-lg: 26px;
  --radius-md: 16px;
  --radius-sm: 10px;

  /* 动效 */
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 3. 无障碍基础 ---------- */
:focus-visible {
  outline: 3px solid var(--sand);
  outline-offset: 3px;
  border-radius: 4px;
}

.site-footer :focus-visible {
  outline-color: var(--ice);
}

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

.skip-link {
  position: fixed;
  top: 10px;
  left: 50%;
  z-index: 200;
  padding: 10px 22px;
  border-radius: 999px;
  background-color: var(--fir-deep);
  color: var(--frost);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  box-shadow: 0 16px 34px -20px rgba(7, 59, 48, .9);
  transform: translate(-50%, -180%);
  transition: transform .22s var(--ease);
}

.skip-link:focus {
  transform: translate(-50%, 0);
}

/* ---------- 4. 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: clamp(40px, 6vw, 88px);
}

.section--tight {
  padding-block: clamp(24px, 3.5vw, 48px);
}

.stack {
  display: grid;
  gap: clamp(14px, 2vw, 26px);
}

.grid {
  display: grid;
  gap: clamp(14px, 2vw, 24px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

/* ---------- 5. 面板与章节头 ---------- */
.panel {
  position: relative;
  padding: clamp(22px, 3.4vw, 44px);
  border: 1px solid rgba(255, 255, 255, .9);
  border-radius: var(--radius-lg);
  background-color: var(--frost);
  box-shadow: var(--shadow-card);
}

.panel--tint {
  border-color: var(--line);
  background-image: linear-gradient(160deg, rgba(127, 183, 201, .16), rgba(245, 246, 242, .92) 58%);
  box-shadow: none;
}

.panel--fir {
  border-color: rgba(255, 255, 255, .12);
  background-color: var(--fir-deep);
  color: rgba(255, 255, 255, .9);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--maple);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background-color: currentColor;
  opacity: .6;
}

.section-title {
  margin-top: 10px;
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 800;
}

.lede {
  max-width: 62ch;
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.8;
  color: var(--moss);
}

.panel--fir .lede,
.panel--fir .board-meta {
  color: rgba(255, 255, 255, .72);
}

.rule {
  height: 1px;
  margin: clamp(20px, 3vw, 32px) 0;
  border: 0;
  background-image: linear-gradient(90deg, var(--line-strong), transparent);
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: .02em;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color .18s var(--ease), color .18s var(--ease),
              border-color .18s var(--ease), transform .18s var(--ease),
              box-shadow .18s var(--ease);
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background-color: var(--maple);
  color: #FFFFFF;
  box-shadow: 0 12px 26px -16px rgba(200, 16, 46, .95);
}

.btn-primary:hover {
  background-color: var(--maple-deep);
  color: #FFFFFF;
}

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

.btn-sand:hover {
  background-color: #E8B956;
  color: var(--ink);
}

.btn-ghost {
  border-color: currentColor;
  background-color: transparent;
  color: inherit;
}

.btn-ghost:hover {
  background-color: rgba(255, 255, 255, .12);
}

.btn-sm {
  padding: 9px 16px;
  font-size: 14px;
}

/* ---------- 7. 头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 120;
  background-color: transparent;
  color: var(--ink);
  transition: background-color .32s var(--ease), color .32s var(--ease),
              box-shadow .32s var(--ease);
}

.site-header[data-scrolled] {
  background-color: var(--fir-deep);
  color: var(--frost);
  box-shadow: 0 18px 40px -32px rgba(7, 59, 48, .95);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 28px);
  width: 100%;
  max-width: var(--maxw);
  min-height: var(--header-h);
  margin-inline: auto;
  padding: 10px var(--gutter);
}

.brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand-mark {
  flex: none;
  width: 30px;
  height: 30px;
  background-image: linear-gradient(140deg, var(--maple) 0%, var(--maple-deep) 58%, var(--sand) 100%);
  clip-path: polygon(50% 0%, 61% 33%, 100% 26%, 75% 56%, 92% 94%, 50% 74%, 8% 94%, 25% 56%, 0% 26%, 39% 33%);
  transition: background-image .3s var(--ease);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.18;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: .01em;
  white-space: nowrap;
}

.brand-tagline {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .08em;
  color: var(--moss);
  white-space: nowrap;
  transition: color .3s var(--ease);
}

.site-header[data-scrolled] .brand-tagline {
  color: rgba(255, 255, 255, .62);
}

/* 导航 */
.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-item {
  display: flex;
}

.nav-link {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1px;
  padding: 8px 13px 9px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  color: inherit;
  transition: color .18s var(--ease), background-color .18s var(--ease);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .16em;
  opacity: .5;
  transition: opacity .18s var(--ease), color .18s var(--ease);
}

.nav-label {
  display: inline-block;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--maple);
  background-color: rgba(200, 16, 46, .07);
}

.nav-link:hover .nav-index { opacity: .9; }

.site-header[data-scrolled] .nav-link:hover {
  color: var(--sand);
  background-color: rgba(255, 255, 255, .1);
}

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

.nav-link[aria-current="page"] .nav-index { opacity: 1; }

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 3px;
  height: 2px;
  border-radius: 2px;
  background-color: currentColor;
}

.site-header[data-scrolled] .nav-link[aria-current="page"] {
  color: var(--sand);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 46px;
  height: 46px;
  margin-left: auto;
  padding: 0 11px;
  border: 1px solid currentColor;
  border-radius: 14px;
  background-color: transparent;
  color: inherit;
  cursor: pointer;
  transition: background-color .18s var(--ease), color .18s var(--ease);
}

.nav-toggle:hover {
  background-color: rgba(127, 183, 201, .18);
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background-color: currentColor;
  transition: transform .24s var(--ease), opacity .18s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 阅读进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
  background-color: transparent;
}

.scroll-progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  background-image: linear-gradient(90deg, var(--maple) 0%, var(--sand) 55%, var(--ice) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform .12s linear;
}

/* 移动抽屉专属内容 */
.nav-drawer-foot { display: none; }

.nav-drawer-note {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--moss);
}

/* 抽屉蒙层 */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 130;
  background-color: rgba(7, 59, 48, .5);
  opacity: 0;
  visibility: hidden;
  transition: opacity .24s var(--ease), visibility 0s linear .24s;
}

.nav-scrim[data-open] {
  opacity: 1;
  visibility: visible;
  transition: opacity .24s var(--ease), visibility 0s linear 0s;
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 104px);
  overflow: hidden;
  background-color: var(--fir-deep);
  color: rgba(255, 255, 255, .82);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -12%;
  width: min(62vw, 620px);
  aspect-ratio: 1 / 1;
  background-image: radial-gradient(circle at 50% 50%, rgba(127, 183, 201, .3), transparent 62%);
  pointer-events: none;
}

.site-footer::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background-image: linear-gradient(90deg,
    var(--maple) 0 38%,
    var(--sand) 38% 62%,
    var(--ice) 62% 100%);
}

.footer-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr));
  gap: clamp(26px, 4vw, 52px);
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(44px, 6vw, 80px) var(--gutter) clamp(24px, 3vw, 40px);
}

.footer-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.footer-brand-link .brand-mark {
  width: 26px;
  height: 26px;
}

.footer-brand-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--frost);
}

.footer-tagline {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ice);
}

.footer-note {
  max-width: 40ch;
  margin-bottom: 20px;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .68);
}

.footer-cta {
  margin-top: 2px;
}

.footer-col {
  align-content: start;
  min-width: 0;
}

.footer-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ice);
}

.footer-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--sand);
}

.footer-list {
  display: grid;
  gap: 9px;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: rgba(255, 255, 255, .78);
  transition: color .18s var(--ease);
}

.footer-link::before {
  content: "";
  width: 6px;
  height: 1px;
  background-color: var(--sand);
  opacity: .5;
  transition: width .18s var(--ease), opacity .18s var(--ease);
}

.footer-link:hover {
  color: var(--frost);
}

.footer-link:hover::before {
  width: 16px;
  opacity: 1;
}

.footer-contact .footer-address {
  display: grid;
  gap: 8px;
  font-style: normal;
}

.footer-address-line {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 255, 255, .76);
  word-break: break-word;
}

.footer-meta {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 18px var(--gutter) clamp(28px, 4vw, 44px);
  border-top: 1px solid rgba(255, 255, 255, .14);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(255, 255, 255, .58);
}

.footer-copyright { margin: 0; }

.footer-icp {
  margin: 0;
  color: var(--sand);
}

/* ---------- 9. 面包屑 ---------- */
.breadcrumbs {
  padding-block: 16px 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb-list li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--moss);
}

.breadcrumb-list li:not(:first-child)::before {
  content: "/";
  color: rgba(107, 127, 120, .55);
}

.breadcrumb-link {
  color: var(--fir);
  border-bottom: 1px solid transparent;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.breadcrumb-link:hover {
  color: var(--maple);
  border-bottom-color: currentColor;
}

.breadcrumb-current {
  color: var(--ink);
}

/* ---------- 10. 索引卡 / 标签 ---------- */
.index-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background-color: var(--frost);
  transition: transform .2s var(--ease), border-color .2s var(--ease),
              box-shadow .2s var(--ease);
}

.index-card:hover {
  transform: translateY(-2px);
  border-color: rgba(200, 16, 46, .55);
  box-shadow: var(--shadow-lift);
}

.index-card-no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .14em;
  color: var(--maple);
}

.index-card-title {
  font-size: 18px;
  font-weight: 800;
}

.index-card-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--moss);
}

.index-card-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding-top: 10px;
  border-top: 1px dashed var(--line-strong);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--moss);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  background-color: rgba(127, 183, 201, .2);
  color: var(--fir);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
}

.date-tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 9px;
  border-radius: 8px;
  background-color: rgba(217, 164, 65, .26);
  color: #4A3403;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  transition: background-color .2s var(--ease), color .2s var(--ease);
}

.index-card:hover .date-tag {
  background-color: var(--sand);
  color: var(--ink);
}

/* ---------- 11. 专题研究板 ---------- */
.board {
  padding: clamp(22px, 3.2vw, 40px);
  border-radius: var(--radius-lg);
  background-color: var(--indigo);
  color: rgba(255, 255, 255, .92);
}

.board--wine {
  background-color: var(--wine);
}

.board-title {
  margin-top: 8px;
  font-size: clamp(20px, 2.4vw, 26px);
}

.board-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .62);
}

.term-list {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.term {
  display: grid;
  grid-template-columns: minmax(84px, auto) 1fr;
  gap: 12px;
  font-size: 14px;
  line-height: 1.65;
}

.term-key {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--sand);
}

/* ---------- 12. 提示条 ---------- */
.callout {
  padding: 16px 20px;
  border-left: 3px solid var(--maple);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background-color: rgba(200, 16, 46, .06);
  font-size: 15px;
  line-height: 1.75;
}

.callout-title {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--maple);
}

/* ---------- 13. 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background-image: linear-gradient(155deg, rgba(127, 183, 201, .38), rgba(14, 90, 74, .16));
}

.media-frame img,
.media-frame video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--wide { aspect-ratio: 21 / 9; }

.media-placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 16px;
  background-image: repeating-linear-gradient(45deg, rgba(255, 255, 255, .45) 0 1px, transparent 1px 14px);
  color: var(--fir);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  text-align: center;
}

/* ---------- 14. 显现动效 ---------- */
html.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}

html.has-js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1080px) and (min-width: 900px) {
  .nav-link {
    padding: 8px 9px 9px;
    font-size: 14px;
  }
  .brand-tagline { display: none; }
}

@media (max-width: 899px) {
  :root { --header-h: 64px; }

  .brand-name { font-size: 15px; }

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

  .primary-nav {
    position: fixed;
    left: 12px;
    right: 12px;
    bottom: 12px;
    z-index: 140;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    padding: 18px 18px 22px;
    border-radius: 24px;
    background-color: var(--frost);
    color: var(--ink);
    box-shadow: 0 30px 70px -28px rgba(7, 59, 48, .6);
    transform: translateY(calc(100% + 28px));
    visibility: hidden;
    transition: transform .24s var(--ease), visibility 0s linear .24s;
  }

  .primary-nav[data-open] {
    transform: translateY(0);
    visibility: visible;
    transition: transform .24s var(--ease), visibility 0s linear 0s;
  }

  .primary-nav .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .primary-nav .nav-link {
    flex-direction: row;
    align-items: baseline;
    gap: 12px;
    padding: 13px 12px;
    font-size: 16.5px;
    font-weight: 700;
    border-radius: 14px;
  }

  .primary-nav .nav-index {
    min-width: 20px;
    font-size: 11px;
    opacity: .7;
  }

  .primary-nav .nav-link[aria-current="page"] {
    background-color: rgba(200, 16, 46, .08);
  }

  .primary-nav .nav-link[aria-current="page"]::after {
    left: 0;
    right: auto;
    top: 11px;
    bottom: 11px;
    width: 3px;
    height: auto;
  }

  .nav-drawer-foot {
    display: grid;
    gap: 12px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px dashed var(--line-strong);
  }

  body.nav-open { overflow: hidden; }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .primary-nav { margin-left: auto; }
  .nav-scrim { display: none; }
}

@media (max-width: 900px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 700px) {
  .brand-tagline { display: none; }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .footer-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3 { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .header-actions { display: none; }
}

/* ---------- 16. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  html.has-js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .btn:hover,
  .index-card:hover { transform: none; }
}