/* =========================================================
   银娱电子中心 · 共享样式 /assets/site.css
   坐标轨道 + 透明叠加导航 + 连续画布 + 分区式页脚信息台
   ========================================================= */

/* ---------- 1. 设计变量 ---------- */
:root{
  --ink-900:#0A1120;
  --ink-800:#111B2E;
  --ink-700:#1B2740;
  --ink-500:#2C3B58;
  --silver-500:#8C95A8;
  --silver-200:#CFD5DF;
  --silver-050:#F3F5F9;
  --paper:#FFFFFF;
  --cyan:#35D6E8;
  --gold:#C9A24A;
  --mist:#0E3A44;

  --cyan-08:rgba(53,214,232,.08);
  --cyan-16:rgba(53,214,232,.16);
  --gold-10:rgba(201,162,74,.10);
  --ink-900-92:rgba(10,17,32,.92);
  --ink-800-92:rgba(17,27,46,.92);

  --font-sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --rail-w:88px;
  --header-h:72px;
  --top-offset:calc(var(--header-h) + 3px);

  --radius-panel:24px;
  --radius-lg:20px;
  --radius-sm:12px;
  --radius-pill:999px;

  --gutter:clamp(20px,4vw,64px);
  --section-y:clamp(56px,8vw,120px);

  --fs-display:clamp(2.6rem,5vw,4.4rem);
  --fs-index:.78rem;

  --progress:0;
}
@media (min-width:961px){
  :root{ --top-offset:var(--header-h); }
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--top-offset) + 24px);
}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:4px}
[hidden]{display:none !important}

/* ---------- 3. 基础排版 ---------- */
body{
  margin:0;
  padding-left:var(--rail-w);
  background:var(--ink-900);
  color:var(--silver-200);
  font-family:var(--font-sans);
  font-size:1rem;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
@media (max-width:960px){
  body{padding-left:0}
}
h1,h2,h3,h4{font-weight:400;line-height:1.28;color:var(--paper);letter-spacing:-.01em}
p{max-width:72ch}
strong{font-weight:500;color:var(--paper)}
.display{
  font-size:var(--fs-display);
  font-weight:300;
  line-height:1.1;
  letter-spacing:-.02em;
  color:var(--paper);
}
.section-title{font-size:clamp(1.5rem,2.4vw,2rem);font-weight:400}
.eyebrow{
  font-family:var(--font-mono);
  font-size:var(--fs-index);
  letter-spacing:.16em;
  color:var(--cyan);
  text-transform:uppercase;
}
.index-label{
  font-family:var(--font-mono);
  font-size:var(--fs-index);
  letter-spacing:.12em;
  color:var(--silver-500);
}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.lede{font-size:clamp(1rem,1.4vw,1.125rem);color:var(--silver-500);line-height:1.85;max-width:60ch}
.rule{height:1px;border:0;background:var(--ink-500);margin:0}
.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;border:0;
}

/* ---------- 4. 画布与容器 ---------- */
.canvas{position:relative;background:var(--ink-900);color:var(--silver-200)}
.canvas--ink{background:var(--ink-800)}
.canvas--light{background:var(--silver-050);color:#22303F}
.canvas--paper{background:var(--paper);color:#1E2836}
.canvas--light h1,.canvas--light h2,.canvas--light h3,.canvas--light h4,
.canvas--paper h1,.canvas--paper h2,.canvas--paper h3,.canvas--paper h4{color:var(--ink-900)}
.canvas--light .section-title,.canvas--paper .section-title{color:var(--ink-900)}
.canvas--light .lede,.canvas--paper .lede{color:#4B5769}
.canvas--light .eyebrow,.canvas--paper .eyebrow{color:#0E7C8C}
.canvas--light .index-label,.canvas--paper .index-label{color:#6B7686}
.canvas--light .rule,.canvas--paper .rule{background:#D5DBE4}

.container{width:100%;max-width:1320px;margin-inline:auto;padding-inline:var(--gutter)}
.container--wide{max-width:1560px}
.container--narrow{max-width:880px}
.section{padding-block:var(--section-y)}
.section--tight{padding-block:clamp(36px,5vw,72px)}
.section--flush-top{padding-top:0}

#main-content{padding-top:var(--top-offset)}
#main-content[data-bleed]{padding-top:0}

/* ---------- 5. 网格 ---------- */
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:24px}
.split{display:grid;grid-template-columns:7fr 4fr;gap:clamp(24px,4vw,72px);align-items:start}
.split--reverse{grid-template-columns:4fr 7fr}
.split--even{grid-template-columns:1fr 1fr}
.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}
.span-full{grid-column:1 / -1}
@media (max-width:960px){
  .grid{gap:20px}
  .col-4,.col-5,.col-6,.col-7,.col-8{grid-column:1 / -1}
}
@media (max-width:860px){
  .split,.split--reverse,.split--even{grid-template-columns:1fr;gap:clamp(20px,5vw,36px)}
}

/* ---------- 6. 按钮与控件 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.45rem;
  padding:.68rem 1.35rem;border-radius:var(--radius-pill);
  border:1px solid transparent;
  font-size:.88rem;line-height:1.2;letter-spacing:.05em;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease;
}
.btn-solid{background:var(--cyan);color:#06232A;font-weight:500}
.btn-solid:hover{background:#5FE2F0;color:#06232A}
.btn-ghost{border-color:var(--ink-500);color:var(--silver-200)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan);background:var(--cyan-08)}
.btn-gold{border-color:rgba(201,162,74,.5);color:var(--gold)}
.btn-gold:hover{background:var(--gold-10);border-color:var(--gold)}
.btn-block{width:100%}
.canvas--light .btn-ghost,.canvas--paper .btn-ghost{border-color:#C4CCDA;color:var(--ink-800)}
.canvas--light .btn-ghost:hover,.canvas--paper .btn-ghost:hover{
  border-color:#0E7C8C;color:#0E7C8C;background:rgba(53,214,232,.12);
}

.pill-group{display:flex;flex-wrap:wrap;gap:8px}
.pill{
  display:inline-flex;align-items:center;
  padding:.45rem 1rem;border-radius:var(--radius-pill);
  border:1px solid var(--ink-500);color:var(--silver-200);
  font-size:.82rem;letter-spacing:.06em;line-height:1.4;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease;
}
.pill:hover{border-color:var(--cyan);color:var(--cyan)}
.pill[aria-pressed="true"],.pill[aria-selected="true"]{
  background:var(--mist);border-color:var(--cyan);color:var(--cyan);
}
.canvas--light .pill,.canvas--paper .pill{border-color:#C4CCDA;color:#3A4759}
.canvas--light .pill[aria-pressed="true"],.canvas--paper .pill[aria-pressed="true"]{
  background:rgba(53,214,232,.14);border-color:#0E7C8C;color:#0E7C8C;
}

.badge{
  display:inline-flex;align-items:center;
  padding:.2rem .6rem;border-radius:var(--radius-pill);
  border:1px solid var(--ink-500);
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;line-height:1.6;
  color:var(--silver-500);
}
.badge-cyan{color:var(--cyan);border-color:rgba(53,214,232,.45);background:var(--cyan-08)}
.badge-gold{color:var(--gold);border-color:rgba(201,162,74,.45);background:var(--gold-10)}

/* ---------- 7. 内容组件 ---------- */
.section-head{display:flex;flex-direction:column;gap:.85rem;max-width:64ch}
.section-head--split{
  flex-direction:row;justify-content:space-between;align-items:flex-end;
  gap:clamp(20px,4vw,64px);max-width:none;flex-wrap:wrap;
}
@media (max-width:860px){
  .section-head--split{flex-direction:column;align-items:flex-start}
}
.section-head + *{margin-top:clamp(24px,3vw,40px)}

.panel{
  background:var(--ink-800);
  border-radius:var(--radius-panel);
  padding:clamp(20px,3vw,36px);
}
.panel--outline{background:transparent;border:1px solid var(--ink-500)}
.canvas--light .panel,.canvas--paper .panel{background:var(--paper)}
.canvas--light .panel--outline,.canvas--paper .panel--outline{
  background:transparent;border-color:#D5DBE4;
}

.breadcrumb{margin-bottom:clamp(16px,2vw,28px)}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;font-size:.8rem;color:var(--silver-500)}
.breadcrumb-list li{display:flex;align-items:center;gap:.5rem}
.breadcrumb-list li + li::before{content:"/";color:var(--ink-500)}
.breadcrumb-list a:hover{color:var(--cyan)}
.breadcrumb-list [aria-current="page"]{color:var(--silver-200)}

/* 技能树式服务路径 */
.path{position:relative;display:grid;padding-left:28px}
.path::before{
  content:"";position:absolute;left:6px;top:10px;bottom:10px;width:1px;
  background:linear-gradient(180deg,var(--cyan),var(--ink-500));
}
.path-item{position:relative;padding:14px 0}
.path-item::before{
  content:"";position:absolute;left:-28px;top:22px;
  width:13px;height:13px;border-radius:50%;
  border:1px solid var(--cyan);background:var(--ink-900);
  transition:background-color .2s ease,transform .2s ease;
}
.path-item[data-state="done"]::before{background:var(--cyan)}
.path-item[data-state="active"]::before{background:var(--cyan);box-shadow:0 0 0 4px var(--cyan-08)}
.path-step{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.14em;color:var(--gold)}
.path-title{font-size:1.05rem;color:var(--paper);margin-top:.2rem}
.path-text{font-size:.92rem;color:var(--silver-500);margin-top:.3rem}

/* 通用条目：悬停色阶上升 + 2px 青色指示条 */
.row-link{
  position:relative;display:block;
  padding:.85rem 1rem;
  border-radius:var(--radius-sm);
  transition:background-color .2s ease,color .2s ease;
}
.row-link::before{
  content:"";position:absolute;left:0;top:.7rem;bottom:.7rem;width:2px;
  background:var(--cyan);transform:scaleY(0);transform-origin:top;
  transition:transform .2s ease;
}
.row-link:hover{background:var(--mist);color:var(--paper)}
.row-link:hover::before,.row-link:focus-visible::before{transform:scaleY(1)}

/* ---------- 8. 图片容器（页面阶段放占位图） ---------- */
.figure{margin:0}
.img-frame{
  position:relative;overflow:hidden;isolation:isolate;
  border-radius:var(--radius-panel);
  background:linear-gradient(150deg,var(--ink-700) 0%,var(--ink-900) 100%);
  aspect-ratio:16 / 10;
}
.img-frame img{width:100%;height:100%;object-fit:cover}
.img-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.45;
  background-image:
    linear-gradient(to right,rgba(140,149,168,.16) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(140,149,168,.16) 1px,transparent 1px);
  background-size:56px 56px;
}
.img-frame--wide{aspect-ratio:21 / 9}
.img-frame--tall{aspect-ratio:4 / 5}
.img-frame--square{aspect-ratio:1 / 1}
.img-frame--auto{aspect-ratio:auto;min-height:180px}
.img-caption{margin-top:.7rem;font-size:.78rem;letter-spacing:.12em;color:var(--silver-500)}
.canvas--light .img-caption,.canvas--paper .img-caption{color:#6B7686}

/* ---------- 9. 站点头部 ---------- */
.skip-link{
  position:fixed;top:8px;left:8px;z-index:300;
  padding:.6rem 1.05rem;border-radius:var(--radius-pill);
  background:var(--cyan);color:#06232A;font-size:.85rem;font-weight:500;
  transform:translateY(-200%);
  transition:transform .2s ease;
}
.skip-link:focus{transform:translateY(0)}

.site-header{position:fixed;inset:0;z-index:120;pointer-events:none}
.site-rail,.header-bar{pointer-events:auto}

/* 左侧品牌轨道 */
.site-rail{
  position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);
  display:flex;flex-direction:column;align-items:center;gap:18px;
  padding:26px 8px 22px;
  background:transparent;
  border-right:1px solid transparent;
  transition:background-color .24s ease,border-color .24s ease;
  overflow:hidden;
}
.site-header[data-state="scrolled"] .site-rail{
  background:var(--ink-900-92);
  border-right-color:var(--ink-500);
}
.rail-coord-mark{
  position:relative;display:block;width:22px;height:22px;flex:none;
  border:1px solid var(--ink-500);border-radius:4px;
}
.rail-coord-mark::before,
.rail-coord-mark::after{
  content:"";position:absolute;background:var(--cyan);
}
.rail-coord-mark::before{left:50%;top:-4px;bottom:-4px;width:1px;transform:translateX(-50%)}
.rail-coord-mark::after{top:50%;left:-4px;right:-4px;height:1px;transform:translateY(-50%)}
.rail-current{
  writing-mode:vertical-rl;
  font-size:.72rem;letter-spacing:.34em;line-height:1;
  color:var(--silver-200);
  padding:10px 0;
  border-top:1px solid var(--ink-500);
  border-bottom:1px solid var(--ink-500);
}
.rail-scale{
  position:relative;flex:1;width:100%;min-height:40px;
}
.rail-scale::before{
  content:"";position:absolute;left:50%;top:0;bottom:0;width:1px;
  transform:translateX(-50%);
  background:repeating-linear-gradient(
    to bottom,
    var(--ink-500) 0 1px,
    transparent 1px 14px
  );
}
.rail-index{
  flex:none;width:100%;max-height:38%;overflow:auto;
  scrollbar-width:none;
}
.rail-index::-webkit-scrollbar{display:none}
.rail-index:empty{display:none}
.rail-index-list{display:grid;gap:2px}
.rail-index a{
  position:relative;display:block;
  padding:.3rem 0 .3rem .55rem;
  font-size:.68rem;line-height:1.45;letter-spacing:.02em;
  color:var(--silver-500);
  transition:color .2s ease;
}
.rail-index a::before{
  content:"";position:absolute;left:0;top:.35em;bottom:.35em;width:2px;
  background:var(--cyan);transform:scaleY(0);transform-origin:top;
  transition:transform .2s ease;
}
.rail-index a:hover,.rail-index a:focus-visible{color:var(--silver-200)}
.rail-index a:hover::before,.rail-index a:focus-visible::before,
.rail-index a[aria-current="true"]::before{transform:scaleY(1)}
.rail-index a[aria-current="true"]{color:var(--cyan)}
.rail-coord{
  flex:none;font-size:.56rem;line-height:1.6;letter-spacing:.06em;
  color:var(--silver-500);opacity:.75;text-align:center;
}
.rail-progress{
  position:absolute;right:0;top:0;bottom:0;width:2px;
  background:rgba(44,59,88,.55);
}
.rail-progress-fill{
  display:block;width:100%;height:100%;
  background:var(--cyan);
  transform:scaleY(var(--progress,0));
  transform-origin:top center;
  transition:transform .12s linear;
}

/* 顶部导航条 */
.header-bar{
  position:fixed;top:0;left:var(--rail-w);right:0;height:var(--header-h);
  display:flex;align-items:center;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background-color .24s ease,border-color .24s ease;
}
.site-header[data-state="scrolled"] .header-bar{
  background:var(--ink-800-92);
  border-bottom-color:var(--ink-500);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}
.header-inner{
  display:flex;align-items:center;gap:clamp(12px,2vw,28px);
  width:100%;max-width:1560px;margin-inline:auto;
  padding-inline:clamp(16px,3vw,40px);
}
.brand{display:inline-flex;align-items:center;gap:.7rem;flex:none}
.brand-mark{
  display:inline-flex;align-items:center;justify-content:center;
  width:34px;height:34px;border-radius:11px;flex:none;
  border:1px solid rgba(53,214,232,.5);
  background:linear-gradient(150deg,var(--mist),rgba(10,17,32,.6));
  color:var(--cyan);font-size:.95rem;font-weight:500;
  transition:border-color .2s ease,color .2s ease;
}
.brand:hover .brand-mark{border-color:var(--cyan);background:var(--mist)}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-name{font-size:.98rem;font-weight:500;color:var(--paper);letter-spacing:.02em}
.brand-sub{font-size:.68rem;letter-spacing:.16em;color:var(--silver-500)}

.primary-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-list a{
  position:relative;display:inline-block;
  padding:.5rem .75rem;border-radius:var(--radius-pill);
  font-size:.9rem;letter-spacing:.04em;line-height:1.4;
  color:var(--silver-200);
  transition:color .2s ease,background-color .2s ease;
}
.nav-list a::after{
  content:"";position:absolute;left:.75rem;right:.75rem;bottom:.16rem;height:2px;
  background:var(--cyan);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .2s ease;
}
.nav-list a:hover{color:var(--paper);background:var(--cyan-08)}
.nav-list a:hover::after,.nav-list a:focus-visible::after{transform:scaleX(1)}
.nav-list a[aria-current="page"]{color:var(--cyan)}
.nav-list a[aria-current="page"]::after{transform:scaleX(1)}

.header-actions{display:flex;align-items:center;gap:.6rem;flex:none}

.nav-toggle{
  display:none;align-items:center;gap:.55rem;flex:none;
  padding:.5rem .9rem;border-radius:var(--radius-pill);
  border:1px solid var(--ink-500);
  color:var(--silver-200);font-size:.82rem;letter-spacing:.1em;
  transition:border-color .2s ease,color .2s ease;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-lines{display:block;width:16px}
.nav-toggle-lines i{
  display:block;height:1.5px;background:currentColor;margin:4px 0;
  transition:transform .2s ease,opacity .2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-lines i:first-child{transform:translateY(2.75px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-lines i:last-child{transform:translateY(-2.75px) rotate(-45deg)}

/* ---------- 10. 站点页脚 ---------- */
.site-footer{
  position:relative;
  background:linear-gradient(180deg,var(--ink-800) 0%,var(--ink-900) 100%);
  color:var(--silver-200);
  border-top:1px solid var(--ink-500);
}
.footer-console{
  display:grid;grid-template-columns:1.25fr 1fr 1.1fr;
  max-width:1560px;margin-inline:auto;
  padding:clamp(40px,6vw,76px) var(--gutter) clamp(28px,4vw,52px);
}
.footer-zone{padding-inline:clamp(0px,2.4vw,36px)}
.footer-zone:first-child{padding-left:0}
.footer-zone + .footer-zone{border-left:1px solid var(--ink-500)}
.zone-label{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.2em;
  color:var(--gold);margin-bottom:1.1rem;
}
.footer-brand{font-size:1.25rem;font-weight:500;letter-spacing:.02em;color:var(--paper)}
.footer-desc{margin-top:.6rem;font-size:.92rem;line-height:1.75;color:var(--silver-500);max-width:34ch}
.footer-meta{margin-top:1.15rem;display:grid;gap:.5rem}
.footer-meta li{display:flex;gap:.7rem;align-items:baseline;font-size:.85rem;line-height:1.7}
.meta-key{color:var(--silver-500);flex:none;min-width:4.6em}
.meta-val{color:var(--silver-200)}
.footer-links{display:grid;gap:.3rem}
.footer-links a{
  position:relative;display:inline-block;
  padding:.32rem 0 .32rem .85rem;
  font-size:.92rem;color:var(--silver-200);
  transition:color .2s ease;
}
.footer-links a::before{
  content:"";position:absolute;left:0;top:.5em;bottom:.5em;width:2px;
  background:var(--cyan);
  transform:scaleY(0);transform-origin:top center;
  transition:transform .2s ease;
}
.footer-links a:hover{color:var(--paper)}
.footer-links a:hover::before,.footer-links a:focus-visible::before{transform:scaleY(1)}
.footer-note{margin-top:1rem;font-size:.82rem;line-height:1.75;color:var(--silver-500);max-width:34ch}
.footer-status{
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;
  gap:12px 24px;
  padding:14px var(--gutter);
  background:var(--ink-900);
  border-top:1px solid var(--ink-500);
  font-size:.8rem;color:var(--silver-500);
}
.status-item{display:flex;flex-wrap:wrap;align-items:center;gap:.6rem;max-width:none}
.status-key{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.14em;color:var(--silver-500)}
.status-ver{color:var(--gold);font-size:.82rem}
.status-desc{color:var(--silver-500)}
.footer-copy{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  padding:14px var(--gutter) 30px;
  background:var(--ink-900);
  border-top:1px solid rgba(44,59,88,.5);
  font-size:.78rem;color:var(--silver-500);max-width:none;
}
.footer-copy .mono{color:var(--silver-500)}

/* ---------- 11. 断点：平板 / 移动 ---------- */
@media (max-width:1080px){
  .footer-console{grid-template-columns:1fr 1fr;row-gap:clamp(24px,4vw,36px)}
  .footer-zone:nth-child(3){
    grid-column:1 / -1;
    border-left:0;padding-left:0;
    border-top:1px solid var(--ink-500);
    padding-top:clamp(20px,3vw,28px);
  }
}

@media (max-width:960px){
  .site-rail{
    top:0;left:0;right:0;bottom:auto;
    width:auto;height:3px;
    flex-direction:row;align-items:stretch;gap:0;
    padding:0;border-right:0;
    background:var(--ink-700);
  }
  .site-header[data-state="scrolled"] .site-rail{background:var(--ink-700);border-right:0}
  .rail-coord-mark,.rail-current,.rail-scale,.rail-index,.rail-coord{display:none}
  .rail-progress{
    position:static;width:100%;height:100%;
    background:transparent;
  }
  .rail-progress-fill{
    height:100%;
    transform:scaleX(var(--progress,0));
    transform-origin:left center;
  }

  .header-bar{top:3px;left:0}
  .header-inner{gap:.7rem}
  .brand-sub{display:none}
  .primary-nav{
    position:fixed;top:var(--top-offset);left:0;right:0;
    margin-left:0;
    background:var(--ink-800);
    border-bottom:1px solid var(--ink-500);
    max-height:0;overflow:hidden;visibility:hidden;
    transition:max-height .28s ease,visibility .28s ease;
    z-index:110;
  }
  .primary-nav[data-open]{
    max-height:min(74vh,540px);
    overflow-y:auto;
    visibility:visible;
  }
  .nav-list{
    flex-direction:column;align-items:stretch;gap:0;
    padding:.6rem clamp(16px,5vw,28px) 1.25rem;
  }
  .nav-list a{
    display:block;
    padding:.9rem .6rem .9rem 1.1rem;
    border-radius:var(--radius-sm);
    font-size:1rem;
  }
  .nav-list a::after{
    left:0;right:auto;top:12px;bottom:12px;
    width:2px;height:auto;bottom:12px;
    transform:scaleY(0);transform-origin:top center;
  }
  .nav-list a:hover::after,
  .nav-list a:focus-visible::after,
  .nav-list a[aria-current="page"]::after{transform:scaleY(1)}
  .nav-list a[aria-current="page"]{background:var(--cyan-08)}
  .nav-toggle{display:inline-flex}
  .header-actions .btn-ghost{display:none}
  .header-actions .btn-solid{padding:.52rem .95rem;font-size:.82rem}
}

@media (max-width:640px){
  :root{ --header-h:62px; }
  .footer-console{grid-template-columns:1fr}
  .footer-zone{padding-inline:0;padding-block:clamp(20px,5vw,28px)}
  .footer-zone:first-child{padding-top:0}
  .footer-zone + .footer-zone,
  .footer-zone:nth-child(3){
    border-left:0;border-top:1px solid var(--ink-500);padding-left:0;
  }
  .footer-copy{flex-direction:column;gap:6px}
  .status-item{width:100%}
}

@media (max-width:420px){
  .brand-name{font-size:.9rem}
  .header-actions .btn-solid{padding:.5rem .8rem;font-size:.78rem}
}

/* ---------- 12. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .rail-progress-fill{transition:none}
}