/* ============================================================
   凤凰体育 · 共享样式表 /assets/site.css
   暖纸阅读区 + 深墨数据区 + 朱红/鎏金/琥珀/青玉状态色
   ============================================================ */

/* 1. Reset ------------------------------------------------- */
:root{
  --ink:#101418;
  --ink-deep:#0B0E12;
  --slate:#1E2A38;
  --paper:#F7F1E7;
  --paper-soft:#EFE7DA;
  --red:#D7263D;
  --red-deep:#A71C2F;
  --orange:#F25C2A;
  --gold:#D9A441;
  --amber:#FFB000;
  --jade:#1F9D8A;
  --graphite:#5B6673;
  --frost:#C9D6E3;

  --font-head:"Noto Sans SC","Source Han Sans SC","HarmonyOS Sans SC",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC",sans-serif;
  --font-num:"JetBrains Mono","Roboto Mono","SFMono-Regular",monospace;

  --r-lg:32px;
  --r-md:24px;
  --r-sm:16px;
  --pill:999px;

  --header-h:64px;
  --shadow-card:0 24px 48px -36px rgba(16,20,24,.75);
  --shadow-float:0 18px 40px -22px rgba(16,20,24,.6);
}

*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 18px);
}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd,address{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg{display:block;max-width:100%;height:auto;}
button{font:inherit;color:inherit;background:none;border:0;}
[hidden]{display:none !important;}

/* 2. 基础排版 ---------------------------------------------- */
body{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.8;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body[data-nav-lock]{overflow:hidden;}

h1,h2,h3,h4,h5{
  font-family:var(--font-head);
  font-weight:800;
  line-height:1.15;
  letter-spacing:-.01em;
}
p{max-width:74ch;}
a{color:var(--red);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px;}
strong,b{font-weight:800;}
::selection{background:rgba(215,38,61,.22);color:var(--ink);}

:focus-visible{
  outline:3px solid var(--gold);
  outline-offset:3px;
  border-radius:8px;
}

.visually-hidden{
  position:absolute !important;
  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;
}

/* 3. 布局容器 ---------------------------------------------- */
.container{
  width:100%;
  max-width:1280px;
  margin:0 auto;
  padding:0 16px;
}
@media (min-width:768px){.container{padding:0 24px;}}
@media (min-width:1200px){.container{padding:0 32px;}}

.section{padding:52px 0;}
@media (min-width:1024px){.section{padding:84px 0;}}

.section-ink{
  background:
    radial-gradient(130% 120% at 0% 0%, #22303f 0%, var(--slate) 34%, var(--ink) 72%),
    var(--ink);
  color:var(--paper);
}
.section-ink .section-title{color:var(--paper);}
.section-ink .lede{color:var(--frost);}
.section-ink .eyebrow{color:var(--gold);}
.section-ink .eyebrow::before{background:var(--red);}

.split{display:grid;gap:24px;}
@media (min-width:1024px){
  .split{grid-template-columns:7fr 5fr;gap:28px;align-items:start;}
}

/* 4. 标题与正文层级 ---------------------------------------- */
.section-head{
  display:grid;
  gap:12px;
  max-width:780px;
  margin-bottom:28px;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-head);
  font-size:12px;
  font-weight:800;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--red);
}
.eyebrow::before{
  content:"";
  width:28px;height:2px;
  border-radius:2px;
  background:var(--gold);
  flex:0 0 auto;
}
.section-title{
  font-size:clamp(28px,4vw,48px);
  line-height:1.08;
  font-weight:800;
  margin:0;
}
.display-title{
  font-family:var(--font-head);
  font-size:clamp(40px,7vw,88px);
  line-height:.96;
  font-weight:900;
  letter-spacing:-.02em;
  transform:skewX(-4deg);
  transform-origin:left center;
  padding-left:2px;
  margin:0;
}
.lede{
  font-size:clamp(17px,1.6vw,19px);
  line-height:1.8;
  color:var(--graphite);
  max-width:64ch;
}
.prose{
  font-size:17px;
  line-height:1.85;
  max-width:70ch;
}
.prose > * + *{margin-top:1.05em;}
.prose h2{font-size:clamp(24px,3vw,32px);margin-top:1.8em;}
.prose h3{font-size:clamp(19px,2.2vw,24px);margin-top:1.5em;color:var(--slate);}
.prose ul,.prose ol{display:grid;gap:.55em;padding-left:1.25em;list-style:disc;}
.prose ol{list-style:decimal;}
.prose li::marker{color:var(--red);font-weight:800;}
.prose a{font-weight:700;}
.prose blockquote{
  border-left:4px solid var(--gold);
  padding:6px 0 6px 18px;
  color:var(--slate);
  font-weight:600;
}

/* 5. 头部 -------------------------------------------------- */
.skip-link{
  position:fixed;
  left:16px;
  top:-80px;
  z-index:200;
  padding:12px 20px;
  border-radius:0 0 14px 14px;
  background:var(--gold);
  color:var(--ink);
  font-weight:800;
  font-size:14px;
  text-decoration:none;
  transition:top .18s ease;
}
.skip-link:focus,
.skip-link:focus-visible{top:0;}

.site-header{
  position:sticky;
  top:0;
  z-index:80;
  color:var(--ink);
  background:linear-gradient(180deg, rgba(247,241,231,.95), rgba(247,241,231,.74));
  border-bottom:1px solid rgba(16,20,24,.07);
  transition:background .24s ease, color .24s ease, border-color .24s ease, box-shadow .24s ease;
}
.site-header.is-stuck{
  background:linear-gradient(180deg, #0D1116, var(--ink));
  color:var(--paper);
  border-bottom-color:rgba(217,164,65,.42);
  box-shadow:0 22px 46px -30px rgba(0,0,0,.9);
}
.header-inner{
  position:relative;
  z-index:95;
  display:flex;
  align-items:center;
  gap:12px;
  min-height:var(--header-h);
}
.header-rule{
  display:block;
  height:2px;
  opacity:0;
  background:linear-gradient(90deg,transparent 0%,var(--red) 14%,var(--gold) 50%,var(--orange) 86%,transparent 100%);
  transition:opacity .24s ease;
}

/* 品牌锁标 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  margin-right:auto;
  color:inherit;
  text-decoration:none;
  padding:6px 0;
}
.brand-mark{
  position:relative;
  flex:0 0 auto;
  width:36px;height:36px;
  border-radius:12px;
  background:linear-gradient(140deg,var(--red),var(--orange) 56%,var(--gold));
  transform:rotate(-8deg);
  box-shadow:0 12px 24px -16px rgba(215,38,61,.95);
}
.brand-mark::before,
.brand-mark::after{
  content:"";
  position:absolute;
  left:8px;
  height:3px;
  border-radius:3px;
  background:#101418;
  opacity:.88;
}
.brand-mark::before{top:13px;width:20px;transform:skewX(-26deg) rotate(-6deg);}
.brand-mark::after{top:21px;width:13px;transform:skewX(-26deg) rotate(-6deg);}
.brand-text{display:flex;flex-direction:column;line-height:1.1;}
.brand-name{
  font-family:var(--font-head);
  font-size:19px;
  font-weight:900;
  letter-spacing:.01em;
}
.brand-tagline{
  font-size:11.5px;
  letter-spacing:.02em;
  color:var(--graphite);
  transition:color .24s ease;
}
.site-header.is-stuck .brand-tagline{color:var(--frost);}

/* 导航 */
.primary-nav{
  display:flex;
  align-items:center;
  gap:8px;
}
.nav-list{display:flex;align-items:center;gap:2px;}
.nav-item{display:block;}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  padding:9px 13px;
  border-radius:var(--pill);
  font-family:var(--font-head);
  font-size:15px;
  font-weight:700;
  color:inherit;
  text-decoration:none;
  transition:background .18s ease, color .18s ease;
}
.nav-link:hover,
.nav-link:focus-visible{
  background:rgba(215,38,61,.1);
  color:var(--red);
}
.site-header.is-stuck .nav-link:hover,
.site-header.is-stuck .nav-link:focus-visible{
  background:rgba(217,164,65,.16);
  color:#fff;
}
.nav-link[aria-current="page"]{
  background:linear-gradient(96deg,var(--red),var(--red-deep));
  color:#fff;
  box-shadow:0 12px 22px -18px rgba(215,38,61,1);
}
.nav-link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:50%;bottom:-6px;
  width:16px;height:2px;
  border-radius:2px;
  background:var(--gold);
  transform:translateX(-50%);
}
.site-header.is-stuck .nav-link[aria-current="page"]{
  background:linear-gradient(96deg,var(--red),var(--orange));
  color:#fff;
}
.nav-aside{display:none;}

.header-actions{
  display:flex;
  align-items:center;
  gap:8px;
}
.header-cta{white-space:nowrap;}

/* 汉堡按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:10px 14px;
  border-radius:var(--pill);
  border:1px solid rgba(16,20,24,.16);
  color:inherit;
  cursor:pointer;
  font-family:var(--font-head);
  font-size:14px;
  font-weight:800;
  transition:background .18s ease, border-color .18s ease;
}
.nav-toggle:hover{background:rgba(217,164,65,.16);}
.site-header.is-stuck .nav-toggle{border-color:rgba(201,214,227,.32);}
.nav-toggle-bars{
  position:relative;
  display:block;
  width:18px;height:2px;
  border-radius:2px;
  background:currentColor;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .18s ease, opacity .18s ease;
}
.nav-toggle-bars::before{top:-6px;}
.nav-toggle-bars::after{top:6px;}
.site-header[data-open="true"]{
  background:linear-gradient(180deg,#0D1116,var(--ink));
  color:var(--paper);
  border-bottom-color:rgba(217,164,65,.42);
}
.site-header[data-open="true"] .brand-tagline{color:var(--frost);}
.site-header[data-open="true"] .nav-toggle{border-color:rgba(217,164,65,.5);}
.site-header[data-open="true"] .nav-toggle-bars{background:transparent;}
.site-header[data-open="true"] .nav-toggle-bars::before{transform:translateY(6px) rotate(45deg);background:var(--gold);}
.site-header[data-open="true"] .nav-toggle-bars::after{transform:translateY(-6px) rotate(-45deg);background:var(--gold);}
.site-header.is-stuck .header-rule,
.site-header[data-open="true"] .header-rule{opacity:1;}

/* 6. 页脚 -------------------------------------------------- */
.site-footer{
  position:relative;
  overflow:hidden;
  isolation:isolate;
  padding:64px 0 26px;
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(30,42,56,.95) 0%, rgba(16,20,24,1) 62%),
    var(--ink-deep);
  color:var(--frost);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:6px;
  background:linear-gradient(90deg,var(--red) 0%,var(--orange) 38%,var(--gold) 68%,var(--jade) 100%);
  z-index:2;
}
.footer-glow{
  position:absolute;
  top:-34%;right:-12%;
  width:520px;height:520px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(215,38,61,.42) 0%,rgba(242,92,42,.16) 42%,transparent 68%);
  z-index:0;
  pointer-events:none;
}
.footer-top{
  position:relative;
  z-index:1;
  display:grid;
  gap:40px;
}
.footer-brand{display:grid;gap:0;align-content:start;}
.brand-footer{margin-right:0;color:var(--paper);padding:0;}
.brand-footer .brand-mark{background:linear-gradient(140deg,var(--gold),var(--orange) 70%,var(--red));}
.brand-footer .brand-name{font-size:21px;color:var(--paper);}
.brand-footer .brand-tagline{font-size:12.5px;color:rgba(201,214,227,.8);}
.footer-badges{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-top:22px;
}
.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:6px 13px;
  border-radius:var(--pill);
  border:1px solid rgba(201,214,227,.3);
  background:rgba(30,42,56,.62);
  color:var(--frost);
  font-size:12px;
  font-weight:700;
  letter-spacing:.05em;
}
.footer-tip{
  margin-top:18px;
  max-width:38ch;
  font-size:14px;
  line-height:1.75;
  color:rgba(201,214,227,.76);
}
.footer-nav{
  display:grid;
  gap:28px;
}
.footer-col-title{
  font-family:var(--font-head);
  font-size:12px;
  font-weight:800;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--gold);
  margin-bottom:16px;
}
.footer-links{display:grid;gap:11px;}
.footer-link{
  display:inline-block;
  font-size:16px;
  font-weight:600;
  color:#E6EDF5;
  text-decoration:none;
  transition:color .18s ease, transform .18s ease;
}
.footer-link:hover,
.footer-link:focus-visible{color:var(--gold);transform:translateX(4px);}
.footer-col-contact{display:grid;gap:16px;justify-items:start;align-content:start;}
.footer-contact{
  display:grid;
  gap:10px;
  font-style:normal;
  font-size:14px;
  line-height:1.65;
  color:rgba(230,237,245,.92);
}
.footer-contact-line{display:block;word-break:break-word;}
.footer-contact-label{
  display:inline-block;
  min-width:42px;
  margin-right:6px;
  font-family:var(--font-head);
  font-size:11px;
  font-weight:800;
  letter-spacing:.16em;
  color:var(--gold);
}
.footer-bottom{
  position:relative;
  z-index:1;
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:10px 24px;
  margin-top:44px;
  padding-top:20px;
  border-top:1px solid rgba(201,214,227,.2);
  font-size:13px;
  line-height:1.6;
  color:rgba(201,214,227,.72);
}
.footer-legal{display:flex;align-items:center;gap:9px;flex-wrap:wrap;max-width:none;}
.footer-legal-mark{
  width:8px;height:8px;
  flex:0 0 auto;
  border-radius:2px;
  transform:rotate(45deg);
  background:linear-gradient(140deg,var(--red),var(--gold));
}
.footer-note{max-width:52ch;}

/* 7. 按钮 -------------------------------------------------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:14px 24px;
  border:1px solid transparent;
  border-radius:var(--pill);
  font-family:var(--font-head);
  font-size:15px;
  font-weight:800;
  line-height:1;
  text-decoration:none;
  cursor:pointer;
  transition:transform .16s ease, background .18s ease, color .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.btn-primary{
  background:linear-gradient(96deg,var(--red),var(--orange));
  color:#fff;
  box-shadow:0 16px 30px -20px rgba(215,38,61,.95);
}
.btn-primary:hover,
.btn-primary:focus-visible{
  transform:translateY(-2px);
  box-shadow:0 20px 34px -18px rgba(242,92,42,.9);
}
.btn-ghost{
  background:rgba(201,214,227,.06);
  color:var(--paper);
  border-color:rgba(201,214,227,.42);
}
.btn-ghost:hover,
.btn-ghost:focus-visible{
  border-color:var(--gold);
  color:var(--gold);
  transform:translateY(-2px);
}
.btn-sm{padding:10px 17px;font-size:13px;}

/* 8. Bento 网格与卡片 -------------------------------------- */
.bento{display:grid;gap:16px;grid-template-columns:1fr;}
.bento-item{min-width:0;}
@media (min-width:768px){
  .bento{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;}
  .bento-item-wide{grid-column:span 2;}
}
@media (min-width:1024px){
  .bento{grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;}
  .bento-item-tall{grid-row:span 2;}
  .bento-item-full{grid-column:1 / -1;}
}

.card{
  position:relative;
  height:100%;
  padding:22px;
  border-radius:var(--r-md);
  background:#fff;
  border:1px solid rgba(16,20,24,.09);
  box-shadow:var(--shadow-card);
}
.card-ink{
  background:linear-gradient(155deg,var(--slate),var(--ink) 82%);
  border-color:rgba(201,214,227,.18);
  color:var(--paper);
}
.card-accent{
  background:linear-gradient(148deg,var(--red),var(--red-deep) 78%);
  border-color:transparent;
  color:#fff;
}
.card-label{
  font-family:var(--font-head);
  font-size:11.5px;
  font-weight:800;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--gold);
}
.card-accent .card-label{color:rgba(255,255,255,.82);}
.card-title{
  font-family:var(--font-head);
  font-size:20px;
  font-weight:800;
  line-height:1.25;
  margin-top:10px;
}
.card-text{
  margin-top:8px;
  font-size:15px;
  line-height:1.7;
  color:var(--graphite);
}
.card-ink .card-text{color:var(--frost);}
.card-accent .card-text{color:rgba(255,255,255,.86);}
.stat-number{
  display:block;
  font-family:var(--font-num);
  font-weight:800;
  font-size:clamp(28px,4vw,44px);
  line-height:1;
  letter-spacing:-.02em;
  color:var(--ink);
}
.card-ink .stat-number{color:var(--gold);}
.card-accent .stat-number{color:#fff;}

/* 状态胶囊 */
.status{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  border-radius:var(--pill);
  font-size:12px;
  font-weight:800;
  letter-spacing:.04em;
  border:1px solid rgba(31,157,138,.42);
  background:rgba(31,157,138,.14);
  color:#147A6B;
}
.status-jade{border-color:rgba(31,157,138,.42);background:rgba(31,157,138,.14);color:#147A6B;}
.status-amber{border-color:rgba(255,176,0,.5);background:rgba(255,176,0,.16);color:#8A5F00;}
.status-red{border-color:rgba(215,38,61,.42);background:rgba(215,38,61,.12);color:var(--red-deep);}

/* 9. 图片容器 ---------------------------------------------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  isolation:isolate;
  width:100%;
  aspect-ratio:16 / 9;
  border-radius:var(--r-md);
  background:linear-gradient(150deg,#22303f,var(--ink) 88%);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:0;
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(215,38,61,.5) 0%, transparent 62%),
    repeating-linear-gradient(118deg, rgba(201,214,227,.14) 0 1px, transparent 1px 16px);
}
.media-frame img{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame-caption{
  position:absolute;
  left:0;right:0;bottom:0;
  z-index:2;
  padding:26px 16px 12px;
  font-size:12.5px;
  line-height:1.5;
  color:var(--frost);
  background:linear-gradient(0deg, rgba(11,14,18,.92), transparent);
}
.media-frame-wide{aspect-ratio:21 / 9;}
.media-frame-square{aspect-ratio:1 / 1;}
.media-frame-tall{aspect-ratio:3 / 4;}
.media-frame-phone{aspect-ratio:9 / 19.5;max-width:280px;}

/* 10. 面包屑 ----------------------------------------------- */
.breadcrumbs{padding-top:18px;}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:13px;
  color:var(--graphite);
}
.breadcrumb-item{display:inline-flex;align-items:center;gap:8px;}
.breadcrumb-item + .breadcrumb-item::before{
  content:"/";
  color:var(--gold);
  font-weight:800;
}
.breadcrumb-link{
  color:var(--graphite);
  text-decoration:none;
  font-weight:600;
}
.breadcrumb-link:hover,
.breadcrumb-link:focus-visible{color:var(--red);text-decoration:underline;}
.breadcrumb-current{color:var(--ink);font-weight:800;}

/* 11. 章节索引 / 阅读进度 / 返回顶部 ----------------------- */
.index-rail{
  position:sticky;
  top:calc(var(--header-h) + 16px);
}
.index-rail-list{display:grid;gap:4px;}
.index-rail-link{
  display:block;
  padding:9px 14px;
  border-radius:12px;
  border-left:2px solid transparent;
  font-size:14px;
  font-weight:700;
  line-height:1.5;
  color:var(--graphite);
  text-decoration:none;
  transition:color .18s ease, background .18s ease, border-color .18s ease;
}
.index-rail-link:hover,
.index-rail-link:focus-visible{color:var(--ink);background:rgba(215,38,61,.08);}
.index-rail-link.is-active{
  color:var(--red);
  border-left-color:var(--gold);
  background:rgba(217,164,65,.16);
}

.read-progress{
  position:fixed;
  top:0;left:0;right:0;
  height:3px;
  z-index:120;
  pointer-events:none;
  background:rgba(16,20,24,.12);
}
.read-progress-fill{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--red),var(--orange) 48%,var(--amber) 78%,var(--gold));
  transition:width .1s linear;
}
.to-top{
  position:fixed;
  right:16px;bottom:20px;
  z-index:110;
  display:grid;
  place-items:center;
  width:52px;height:52px;
  border-radius:50%;
  border:1px solid rgba(217,164,65,.55);
  background:linear-gradient(150deg,var(--slate),var(--ink));
  color:var(--gold);
  font-family:var(--font-head);
  font-size:18px;
  font-weight:900;
  line-height:1;
  cursor:pointer;
  box-shadow:var(--shadow-float);
  transition:transform .18s ease, border-color .18s ease, color .18s ease;
}
.to-top::before{content:"↑";}
.to-top:hover,
.to-top:focus-visible{transform:translateY(-3px);border-color:var(--red);color:#fff;}

/* 12. 表格容器 --------------------------------------------- */
.table-scroll{
  overflow-x:auto;
  border-radius:var(--r-sm);
  border:1px solid rgba(16,20,24,.12);
  -webkit-overflow-scrolling:touch;
}
.table-scroll table{width:100%;border-collapse:collapse;min-width:560px;}

/* 13. 显现动画 --------------------------------------------- */
.js [data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .5s ease, transform .5s ease;
  transition-delay:calc(var(--reveal-i, 0) * 70ms);
}
.js [data-reveal].is-visible{opacity:1;transform:none;}

/* 14. 响应式 ----------------------------------------------- */
@media (min-width:640px){
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr));}
  .to-top{right:24px;bottom:28px;}
}
@media (min-width:900px){
  .footer-top{grid-template-columns:1.1fr 1.9fr;gap:56px;}
  .footer-nav{grid-template-columns:repeat(3,minmax(0,1fr));gap:32px;}
}
@media (min-width:1024px){
  :root{--header-h:76px;}
  .nav-toggle{display:none;}
}
@media (max-width:1023px){
  .nav-toggle{display:inline-flex;}
  .header-actions{margin-left:auto;}
  .primary-nav{
    position:fixed;
    inset:0;
    z-index:90;
    display:flex;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
    padding:calc(var(--header-h) + 22px) 20px 40px;
    overflow-y:auto;
    background:
      radial-gradient(110% 80% at 100% 0%, rgba(215,38,61,.38) 0%, transparent 58%),
      linear-gradient(180deg,#0D1116,var(--ink) 70%,var(--slate));
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .2s ease, transform .2s ease, visibility .2s ease;
  }
  .site-header[data-open="true"] .primary-nav{
    opacity:1;
    visibility:visible;
    transform:none;
  }
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:10px;
    width:100%;
  }
  .nav-link{
    width:100%;
    justify-content:flex-start;
    padding:16px 20px;
    border-radius:18px;
    border:1px solid rgba(201,214,227,.2);
    background:rgba(30,42,56,.6);
    color:var(--paper);
    font-size:20px;
    font-weight:800;
  }
  .site-header.is-stuck .nav-link{color:var(--paper);}
  .nav-link:hover,
  .nav-link:focus-visible{
    background:rgba(217,164,65,.18);
    color:var(--gold);
  }
  .nav-link[aria-current="page"],
  .site-header.is-stuck .nav-link[aria-current="page"]{
    background:linear-gradient(96deg,var(--red),var(--red-deep));
    border-color:transparent;
    color:#fff;
  }
  .nav-link[aria-current="page"]::after{display:none;}
  .nav-aside{
    display:grid;
    gap:14px;
    margin-top:26px;
    padding-top:22px;
    border-top:1px solid rgba(201,214,227,.22);
  }
  .nav-aside-text{
    max-width:34ch;
    font-size:14px;
    line-height:1.7;
    color:rgba(201,214,227,.86);
  }
  .nav-aside .btn{justify-self:start;}
}
@media (max-width:639px){
  .header-cta{display:none;}
  .brand-tagline{display:none;}
  .footer-bottom{flex-direction:column;}
  .btn{width:100%;}
  .footer-col-contact .btn,
  .nav-aside .btn{width:auto;}
  .btn-sm{width:auto;}
}
@media (min-width:640px){
  .btn-sm{width:auto;}
}

/* 15. 动效降级 --------------------------------------------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    transition-delay:0ms !important;
  }
  .js [data-reveal]{opacity:1;transform:none;}
  .btn-primary:hover,
  .btn-ghost:hover,
  .to-top:hover,
  .footer-link:hover{transform:none;}
}