/* ==========================================================================
   加拿大28品牌 · 共享样式表 /assets/site.css
   近单色深蓝骨架 + 纸白阅读层 + 枫叶红/暖金点睛；非对称编辑部节奏
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{max-width:100%;height:auto}
button{font:inherit;color:inherit}
a{color:inherit}
table{border-collapse:collapse;width:100%}

/* ---------- 2. Design tokens ---------- */
:root{
  --navy-900:#12233F;
  --navy-800:#1B365D;
  --navy-700:#24456E;
  --red:#C8322B;
  --red-dark:#97201C;
  --gold:#C9A227;
  --gold-deep:#8E7115;
  --grey:#8A93A0;
  --paper:#F4F1EA;
  --paper-2:#FBFAF7;
  --index:#E3E6EB;
  --ink:#0E1620;
  --ink-soft:#3C4756;

  --navy-glass:rgba(18,35,63,.74);
  --navy-veil:rgba(18,35,63,.05);
  --line-dark:rgba(18,35,63,.14);
  --line-dark-soft:rgba(18,35,63,.08);
  --line-light:rgba(244,241,234,.16);
  --gold-line:rgba(201,162,39,.42);

  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:var(--font-display);
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --maxw:1240px;
  --gutter:20px;
  --header-h:76px;
  --header-h-compact:56px;
  --radius-lg:14px;
  --radius:10px;
  --radius-sm:6px;
  --shadow-1:0 1px 0 rgba(18,35,63,.05),0 16px 34px -26px rgba(18,35,63,.55);
  --shadow-2:0 26px 52px -32px rgba(18,35,63,.62);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  color:var(--ink);
  background-color:var(--paper);
  background-image:
    linear-gradient(var(--navy-veil) 1px,transparent 1px),
    linear-gradient(90deg,var(--navy-veil) 1px,transparent 1px);
  background-size:32px 32px;
  background-position:-1px -1px;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{font-family:var(--font-display);font-weight:800;letter-spacing:-.02em;line-height:1.2;color:var(--ink)}
h1{font-size:clamp(2rem,4.4vw,3.1rem)}
h2{font-size:clamp(1.5rem,2.6vw,2.1rem)}
h3{font-size:clamp(1.12rem,1.7vw,1.36rem);font-weight:700}
h4{font-size:1.02rem;font-weight:700;letter-spacing:0}
p{max-width:68ch}
strong{font-weight:700}

/* ---------- 4. 焦点与可见性 ---------- */
:focus-visible{outline:2px solid var(--red);outline-offset:3px;border-radius:2px}
.site-header :focus-visible,.site-footer :focus-visible{outline-color:var(--gold)}
#main-content{display:block}
#main-content:focus{outline:none}
#main-content:focus-visible{outline:2px solid var(--red);outline-offset:-4px}
.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

.skip-link{
  position:absolute;left:14px;top:-70px;z-index:120;
  padding:10px 18px;background:var(--red);color:#fff;
  font-size:14px;font-weight:700;text-decoration:none;
  border-radius:0 0 var(--radius-sm) var(--radius-sm);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:0}

/* ---------- 5. 文字工具 ---------- */
.mono{font-family:var(--font-mono);font-size:13px;letter-spacing:.05em}
.annotation{font-size:12.5px;line-height:1.6;color:var(--grey);letter-spacing:.02em}
.muted{color:var(--grey)}
.lead{font-size:17px;line-height:1.85;color:var(--ink-soft);max-width:62ch}

/* ---------- 6. 页头：紧凑命令栏 ---------- */
.site-header{
  position:sticky;top:0;z-index:90;
  color:var(--paper);
  background:var(--navy-glass);
  -webkit-backdrop-filter:blur(14px) saturate(130%);
  backdrop-filter:blur(14px) saturate(130%);
  border-bottom:1px solid var(--gold-line);
}
.progress-track{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(244,241,234,.12);overflow:hidden}
.progress-bar{display:block;width:100%;height:100%;background:linear-gradient(90deg,var(--red) 0%,var(--red) 55%,var(--gold) 100%);transform:scaleX(0);transform-origin:0 50%;transition:transform .12s linear}

.header-inner{
  width:min(1320px,100% - 32px);
  margin-inline:auto;
  display:flex;align-items:center;gap:16px;
  min-height:var(--header-h);
  padding-block:10px;
  transition:min-height .26s var(--ease),padding .26s var(--ease);
}
.site-header[data-collapsed] .header-inner{min-height:var(--header-h-compact);padding-block:6px}

.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto;min-width:0;text-decoration:none;color:inherit}
.brand-mark{
  position:relative;flex:0 0 auto;
  display:grid;place-items:center;width:40px;height:40px;
  border:1px solid var(--gold-line);border-radius:var(--radius-sm);
  background:rgba(36,69,110,.6);
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.04em;color:var(--paper);
}
.brand-mark::before{content:"";position:absolute;left:0;top:9px;width:3px;height:15px;background:var(--red)}
.brand-text{display:flex;flex-direction:column;gap:1px;min-width:0}
.brand-line{
  font-family:var(--font-display);font-size:14.5px;font-weight:800;letter-spacing:-.01em;line-height:1.25;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:30ch;
}
.brand-tagline{font-size:12px;letter-spacing:.02em;color:var(--grey);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:32ch}
.site-header[data-collapsed] .brand-tagline{display:none}

.nav-toggle{
  display:none;margin-left:auto;align-items:center;gap:9px;
  padding:9px 13px;cursor:pointer;
  background:rgba(36,69,110,.6);color:var(--paper);
  border:1px solid var(--gold-line);border-radius:var(--radius-sm);
  font-size:13px;font-weight:600;letter-spacing:.02em;
  transition:background-color .2s var(--ease),border-color .2s var(--ease);
}
.nav-toggle:hover{background:rgba(36,69,110,.85)}
.nav-toggle-bars{display:grid;gap:4px;width:16px}
.nav-toggle-bars i{display:block;height:2px;background:var(--paper);transition:transform .2s var(--ease),opacity .2s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle-label{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em}

.primary-nav{margin-left:auto;position:static;visibility:visible}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{display:block}
.nav-link{
  position:relative;display:inline-flex;align-items:baseline;gap:7px;
  padding:9px 11px;border-radius:var(--radius-sm);
  font-size:13.5px;font-weight:600;letter-spacing:.01em;
  color:rgba(244,241,234,.82);text-decoration:none;
  transition:color .2s var(--ease),background-color .2s var(--ease);
}
.nav-link:hover{color:#fff;background:rgba(244,241,234,.08)}
.nav-link[aria-current="page"]{color:#fff}
.nav-link[aria-current="page"]::after{content:"";position:absolute;left:11px;right:11px;bottom:1px;height:2px;background:var(--red)}
.nav-num{font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.08em;color:var(--gold)}

.header-actions{display:flex;align-items:center;gap:8px;margin-left:10px;flex:0 0 auto}
.action-update{
  display:inline-flex;align-items:center;gap:7px;
  padding:10px 16px;border-radius:var(--radius-sm);
  background:var(--red);color:#fff;text-decoration:none;
  font-size:13.5px;font-weight:700;letter-spacing:.02em;
  transition:background-color .2s var(--ease),transform .2s var(--ease);
}
.action-update::after{content:"";width:0;height:0;border-left:5px solid transparent;border-right:5px solid transparent;border-bottom:6px solid currentColor;transform:rotate(90deg)}
.action-update:hover{background:var(--red-dark)}
.action-update:active{transform:translateY(1px)}
.action-bookmark{
  padding:9px 13px;cursor:pointer;
  background:transparent;color:rgba(244,241,234,.85);
  border:1px solid var(--line-light);border-radius:var(--radius-sm);
  font-size:12.5px;font-weight:600;letter-spacing:.04em;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.action-bookmark:hover{background:rgba(244,241,234,.1);color:#fff}
.action-bookmark[aria-pressed="true"]{background:rgba(201,162,39,.2);border-color:var(--gold);color:#fff}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:72px;
  background-color:var(--navy-900);
  background-image:
    linear-gradient(rgba(201,162,39,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(201,162,39,.06) 1px,transparent 1px);
  background-size:44px 44px;
  border-top:3px solid var(--red);
  color:rgba(244,241,234,.76);
}
.site-footer::before{content:"";position:absolute;top:-3px;left:0;width:min(280px,58%);height:3px;background:var(--gold)}

.footer-inner{
  width:min(var(--maxw),100% - var(--gutter)*2);
  margin-inline:auto;
  padding:56px 0 24px;
  display:grid;
  grid-template-columns:1fr;
  gap:36px;
}
.footer-brand{display:grid;gap:14px;align-content:start;min-width:0}
.footer-mark{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-display);font-size:17px;font-weight:800;letter-spacing:-.01em;
  color:#fff;text-decoration:none;
}
.footer-mark::before{content:"";width:12px;height:12px;border-radius:2px;background:var(--red);box-shadow:0 0 0 3px rgba(200,50,43,.22)}
.footer-summary{font-size:14.5px;line-height:1.85;color:rgba(244,241,234,.68);max-width:34ch}

.footer-cols{display:grid;gap:26px;grid-template-columns:repeat(auto-fit,minmax(132px,1fr))}
.footer-col{min-width:0}
.footer-col-title{
  display:flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.14em;
  color:var(--gold);margin-bottom:14px;
}
.footer-col-title::after{content:"";flex:1;height:1px;background:rgba(201,162,39,.3)}
.footer-links{display:grid;gap:9px}
.footer-link{
  display:inline-flex;align-items:center;gap:9px;
  font-size:14px;color:rgba(244,241,234,.76);text-decoration:none;
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.footer-link::before{content:"";flex:0 0 auto;width:5px;height:5px;border-radius:50%;background:var(--grey);transition:background-color .2s var(--ease)}
.footer-link:hover{color:#fff;transform:translateX(2px)}
.footer-link:hover::before{background:var(--red)}

.footer-contact{display:grid;gap:13px;align-content:start;min-width:0}
.footer-contact-item{display:grid;gap:2px}
.footer-contact-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--grey)}
.footer-contact-value{font-size:14.5px;font-weight:600;color:#fff;word-break:break-word;line-height:1.6}
.footer-note{
  margin-top:2px;font-size:12.5px;line-height:1.75;color:rgba(244,241,234,.58);
  border-left:2px solid rgba(201,162,39,.42);padding-left:11px;
}

.footer-bottom{
  grid-column:1 / -1;
  display:flex;flex-wrap:wrap;gap:14px 26px;align-items:center;justify-content:space-between;
  border-top:1px solid var(--line-light);
  padding-top:20px;margin-top:6px;
}
.footer-legal{display:flex;flex-wrap:wrap;gap:18px;align-items:center;font-size:13px}
.footer-legal a{
  color:rgba(244,241,234,.74);text-decoration:none;
  border-bottom:1px solid rgba(244,241,234,.24);padding-bottom:1px;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-legal a:hover{color:#fff;border-bottom-color:var(--gold)}
.footer-meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.02em;color:var(--grey)}

/* ---------- 8. 容器与栅格 ---------- */
.container{width:min(var(--maxw),100% - var(--gutter)*2);margin-inline:auto}
.container--wide{width:min(1440px,100% - var(--gutter)*2);margin-inline:auto}
.section{padding:56px 0}
.section--tight{padding:32px 0}
.section--ruled{border-top:1px dashed var(--line-dark)}
[data-section]{scroll-margin-top:calc(var(--header-h) + 20px)}

.grid--12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:22px}
.col-aside,.col-main,.col-half,.col-fixed{grid-column:1 / -1;min-width:0}

.section-head{display:grid;gap:10px;margin-bottom:26px}
.section-title{font-size:clamp(1.4rem,2.4vw,1.95rem)}
.section-note{font-size:14.5px;line-height:1.8;color:var(--ink-soft);max-width:56ch}
.kicker{
  font-family:var(--font-mono);font-size:12px;font-weight:600;
  letter-spacing:.16em;text-transform:uppercase;color:var(--gold-deep);
}
[data-section].is-current .kicker{color:var(--red)}

/* ---------- 9. 框景与装饰 ---------- */
.frame{
  position:relative;
  padding:clamp(18px,3vw,34px);
  background:var(--paper-2);
  border:1px solid var(--line-dark);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-1);
}
.frame--ink{background:var(--navy-900);border-color:rgba(244,241,234,.14);color:rgba(244,241,234,.84)}
.frame--glass{
  background:var(--navy-glass);border-color:var(--gold-line);color:rgba(244,241,234,.86);
  -webkit-backdrop-filter:blur(12px) saturate(130%);
  backdrop-filter:blur(12px) saturate(130%);
}
.tick-frame{position:relative}
.tick-frame::before,.tick-frame::after{content:"";position:absolute;width:20px;height:20px;border:2px solid var(--red);pointer-events:none}
.tick-frame::before{top:-2px;left:-2px;border-right:0;border-bottom:0}
.tick-frame::after{bottom:-2px;right:-2px;border-left:0;border-top:0}

.divider{height:1px;border:0;margin:28px 0;background:linear-gradient(90deg,var(--gold-line),rgba(201,162,39,0) 72%)}
.divider--dashed{height:0;border-top:1px dashed var(--line-dark);background:none}

/* ---------- 10. 卡片 ---------- */
.card{
  position:relative;min-width:0;
  padding:20px;
  background:var(--paper-2);
  border:1px solid var(--line-dark);
  border-radius:var(--radius);
  box-shadow:var(--shadow-1);
}
.card--glass{
  background:rgba(18,35,63,.06);
  border-color:var(--line-dark);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
}
.card--ink{background:var(--navy-900);border-color:rgba(244,241,234,.14);color:rgba(244,241,234,.84)}
.card--ink .card-title{color:#fff}
.card-index{font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.1em;color:var(--gold-deep)}
.card--ink .card-index{color:var(--gold)}
.card-title{margin-top:8px;font-size:1.06rem;font-weight:700;line-height:1.45}
.card-meta{margin-top:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.03em;color:var(--grey)}
.card-body{margin-top:10px;font-size:15px;line-height:1.8;color:var(--ink-soft)}
.card--ink .card-body{color:rgba(244,241,234,.76)}

/* ---------- 11. 目录清单 ---------- */
.index-list{border-top:1px solid var(--line-dark)}
.index-row{
  display:grid;grid-template-columns:auto minmax(0,1fr);gap:4px 14px;align-items:baseline;
  padding:14px 6px;border-bottom:1px dashed var(--line-dark);
  transition:background-color .2s var(--ease);
}
.index-row:hover{background:rgba(18,35,63,.045)}
.index-row-num{font-family:var(--font-mono);font-size:12.5px;font-weight:600;letter-spacing:.06em;color:var(--gold-deep)}
.index-row-title{font-weight:600;font-size:15px;color:var(--ink);text-decoration:none}
.index-row-title:hover{color:var(--red-dark)}
.index-row-meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.03em;color:var(--grey)}

/* ---------- 12. 侧栏刻度 ---------- */
.rail{display:flex;gap:12px;overflow-x:auto;padding:0 0 8px}
.rail-item{
  display:flex;gap:8px;align-items:baseline;white-space:nowrap;text-decoration:none;
  padding:6px 4px;font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--grey);
  transition:color .2s var(--ease);
}
.rail-item:hover{color:var(--navy-800)}
.rail-item.is-active{color:var(--navy-900);font-weight:700}

/* ---------- 13. 时间轴 ---------- */
.timeline{position:relative;padding-left:28px}
.timeline::before{content:"";position:absolute;left:5px;top:8px;bottom:8px;border-left:1px dashed var(--line-dark)}
.timeline-item{position:relative;padding-bottom:26px}
.timeline-item:last-child{padding-bottom:0}
.timeline-item::before{
  content:"";position:absolute;left:-28px;top:7px;width:11px;height:11px;border-radius:50%;
  background:var(--paper);border:2px solid var(--grey);
}
.timeline-item--accent::before{border-color:var(--red);background:var(--red)}
.timeline-time{font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.06em;color:var(--gold-deep)}

/* ---------- 14. 媒体容器（页面阶段放置图片） ---------- */
.media-frame{
  position:relative;display:block;overflow:hidden;isolation:isolate;
  aspect-ratio:16 / 9;
  border:1px solid var(--line-dark);
  border-radius:var(--radius);
  background-color:var(--index);
  background-image:
    linear-gradient(rgba(18,35,63,.08) 1px,transparent 1px),
    linear-gradient(90deg,rgba(18,35,63,.08) 1px,transparent 1px),
    linear-gradient(0deg,rgba(18,35,63,.05),rgba(18,35,63,.05));
  background-size:28px 28px,28px 28px,100% 100%;
}
.media-frame > img,
.media-frame > picture > img,
.media-frame > svg{display:block;width:100%;height:100%;object-fit:cover;position:relative;z-index:1}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--4x3{aspect-ratio:4 / 3}
.media-frame--1x1{aspect-ratio:1 / 1}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame--ink{background-color:var(--navy-800);border-color:rgba(244,241,234,.16)}
.media-placeholder{
  position:absolute;inset:0;z-index:0;display:grid;place-content:center;gap:6px;text-align:center;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--grey);
}
.media-caption{
  margin-top:10px;padding-left:11px;border-left:2px solid var(--gold-line);
  font-size:12.5px;line-height:1.7;color:var(--grey);
}

/* ---------- 15. 按钮与标签 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 18px;border:1px solid transparent;border-radius:var(--radius-sm);cursor:pointer;
  font-family:var(--font-display);font-size:14px;font-weight:700;letter-spacing:.01em;text-decoration:none;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--red);color:#fff}
.btn--primary:hover{background:var(--red-dark)}
.btn--ghost{border-color:var(--navy-700);color:var(--navy-800);background:transparent}
.btn--ghost:hover{background:var(--navy-800);color:var(--paper);border-color:var(--navy-800)}
.btn--gold{border-color:var(--gold-line);color:var(--gold-deep);background:rgba(201,162,39,.1)}
.btn--gold:hover{background:rgba(201,162,39,.2)}
.btn--sm{padding:8px 13px;font-size:13px}
.btn--block{width:100%}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border-radius:999px;
  background:var(--index);color:var(--navy-800);border:1px solid var(--line-dark);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
}
.tag--accent{background:rgba(200,50,43,.1);color:var(--red-dark);border-color:rgba(200,50,43,.3)}
.tag-list{display:flex;flex-wrap:wrap;gap:8px}

/* ---------- 16. 面包屑 ---------- */
.breadcrumb{padding:20px 0 0;font-size:12.5px;color:var(--grey)}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.breadcrumb li{display:flex;gap:8px;align-items:center;font-family:var(--font-mono);letter-spacing:.03em}
.breadcrumb li + li::before{content:"/";color:var(--gold-deep)}
.breadcrumb a{color:inherit;text-decoration:none;border-bottom:1px solid transparent;transition:color .2s var(--ease),border-color .2s var(--ease)}
.breadcrumb a:hover{color:var(--navy-800);border-bottom-color:var(--gold)}

/* ---------- 17. 滚动显现 ---------- */
html.js-ready [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .45s var(--ease),transform .45s var(--ease);
}
html.js-ready [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 18. 平板与桌面增强 ---------- */
@media (min-width:720px){
  :root{--gutter:28px}
  .section{padding:70px 0}
  .index-row{grid-template-columns:64px minmax(0,1fr) auto}
  .section-head{grid-template-columns:180px minmax(0,1fr);gap:8px 26px;align-items:start}
  .section-head .section-title,.section-head .section-note{grid-column:2}
}

@media (min-width:1024px){
  .col-aside{grid-column:1 / span 3}
  .col-main{grid-column:4 / span 8}
  .col-half{grid-column:4 / span 4}
  .col-fixed{grid-column:11 / span 2}
  .card--lift{margin-top:-22px}
  .footer-inner{grid-template-columns:1.1fr 1.7fr 1.2fr;gap:48px}
  .rail{
    flex-direction:column;gap:0;overflow:visible;padding:0 0 0 14px;
    position:sticky;top:calc(var(--header-h) + 26px);
  }
  .rail-item{margin-left:-16px;padding:7px 0 7px 14px;border-left:2px solid transparent}
  .rail-item.is-active{border-left-color:var(--red);color:var(--navy-900)}
}

/* ---------- 19. 移动端命令栏 ---------- */
@media (max-width:1040px){
  .nav-toggle{display:inline-flex}
  .primary-nav{
    position:absolute;left:0;right:0;top:100%;
    margin-left:0;visibility:hidden;
    background:rgba(15,29,52,.97);
    -webkit-backdrop-filter:blur(14px) saturate(130%);
    backdrop-filter:blur(14px) saturate(130%);
    border-bottom:1px solid var(--gold-line);
    max-height:0;overflow:hidden;
    transition:max-height .28s var(--ease),visibility .28s linear;
  }
  .primary-nav[data-open]{visibility:visible;max-height:min(74vh,560px);overflow-y:auto}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;padding:8px 18px 20px}
  .nav-item{border-bottom:1px dashed rgba(244,241,234,.14)}
  .nav-item:last-child{border-bottom:0}
  .nav-link{width:100%;padding:14px 6px;border-radius:0;font-size:15px}
  .nav-link:hover{background:rgba(244,241,234,.06)}
  .nav-link[aria-current="page"]{background:linear-gradient(90deg,rgba(200,50,43,.24),rgba(200,50,43,0) 78%)}
  .nav-link[aria-current="page"]::after{left:0;right:auto;top:12px;bottom:12px;width:3px;height:auto}
  .nav-num{font-size:11.5px}
}

@media (max-width:900px){
  .action-bookmark{display:none}
}

@media (max-width:640px){
  :root{--gutter:16px}
  body{font-size:15.5px}
  .site-header[data-collapsed] .brand-line{font-size:13.5px}
  .brand-line{font-size:13.5px;max-width:20ch}
  .brand-tagline{display:none}
  .brand-mark{width:34px;height:34px;font-size:12px}
  .action-update{padding:9px 12px;font-size:13px}
  .action-update::after{display:none}
  .nav-toggle{padding:8px 10px}
  .nav-toggle-label{display:none}
  .footer-inner{padding-top:44px}
  .footer-summary{max-width:none}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}

/* ---------- 20. 减少动态偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
  html.js-ready [data-reveal]{opacity:1;transform:none}
  .progress-bar{transition:none}
}