/* =========================================================
   博奥体育官方 /assets/site.css
   共享外壳：reset、tokens、中文排版、头部、轨道、页脚、基础组件
   ========================================================= */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:118px}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,dl,dt,dd,figure,blockquote{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse;border-spacing:0}
hr{border:0;margin:0}

/* ---------- 2. tokens ---------- */
:root{
  --ink:#0B0C10;
  --surface:#101B2E;
  --line:#22304A;
  --paper:#F2E7D5;
  --muted:#8A97AC;
  --neon:#7CFA4A;
  --ember:#FF6A2B;
  --brick:#D2402A;
  --aqua:#35E0D0;
  --white:#FFFFFF;
  --rail-w:84px;
  --shell:1240px;
  --font-sans:"Noto Sans SC","Source Han Sans SC",system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono",SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --ease:cubic-bezier(.2,.7,.2,1);
  --pad-x:clamp(16px,3vw,32px);
}

/* ---------- 3. base ---------- */
body{
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--paper);
  background-color:var(--ink);
  background-image:
    radial-gradient(120% 80% at 82% -12%,rgba(53,224,208,.11),transparent 62%),
    radial-gradient(90% 60% at 6% 108%,rgba(255,106,43,.08),transparent 60%);
  background-repeat:no-repeat;
  padding-left:var(--rail-w);
  min-height:100vh;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(34,48,74,.42) 1px,transparent 1px),
    linear-gradient(90deg,rgba(34,48,74,.42) 1px,transparent 1px);
  background-size:84px 84px;
  -webkit-mask-image:radial-gradient(130% 92% at 76% -10%,#000 0%,transparent 72%);
  mask-image:radial-gradient(130% 92% at 76% -10%,#000 0%,transparent 72%);
  opacity:.75;
}
#main-content{position:relative;z-index:1;display:block;min-height:56vh}
p{max-width:44em}
::selection{background:var(--neon);color:#062008}

:focus-visible{outline:2px solid var(--neon);outline-offset:3px;border-radius:1px}

.visually-hidden{
  position:absolute!important;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;
}
[hidden]{display:none!important}

.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  transform:translateY(-180%);
  padding:10px 18px;
  background:var(--neon);color:#062008;
  font-weight:900;font-size:14px;letter-spacing:.06em;
  transition:transform .24s var(--ease);
}
.skip-link:focus{transform:none}

/* ---------- 4. 滚动进度 ---------- */
.scroll-meter{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:120;
  background:rgba(34,48,74,.75);pointer-events:none;
}
.scroll-meter__bar{
  display:block;width:100%;height:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--aqua),var(--neon) 58%,var(--ember));
}

/* ---------- 5. header 外壳 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:linear-gradient(180deg,rgba(11,12,16,.98),rgba(11,12,16,.88));
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.header-shell{width:100%}

.header-top{
  display:flex;align-items:center;justify-content:space-between;gap:14px 24px;
  min-height:42px;
  padding:7px var(--pad-x);
  border-bottom:1px solid rgba(34,48,74,.65);
  font-size:12px;color:var(--muted);
}
.brand-line{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;max-width:none}
.brand-line__name{
  font-size:12px;font-weight:900;letter-spacing:.2em;color:var(--paper);
  text-transform:uppercase;
}
.brand-line__tag{font-size:12px;letter-spacing:.12em;color:var(--muted)}
.header-top__meta{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.season-chip{
  display:inline-flex;align-items:center;gap:7px;
  padding:3px 10px;
  border:1px solid var(--line);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--paper);
}
.season-chip__dot{
  width:6px;height:6px;border-radius:50%;
  background:var(--neon);box-shadow:0 0 8px var(--neon);
  animation:chipPulse 2.4s infinite ease-in-out;
}
.header-top__link{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--muted);
  border-bottom:1px solid transparent;padding-bottom:2px;
  transition:color .24s var(--ease),border-color .24s var(--ease);
}
.header-top__link:hover{color:var(--neon);border-color:var(--neon)}

.header-main{
  display:flex;align-items:center;gap:clamp(12px,2vw,26px);
  min-height:64px;
  padding:8px var(--pad-x);
}

.primary-nav{display:flex;align-items:stretch;flex-wrap:wrap;gap:2px;margin-right:auto}
.primary-nav__link{
  position:relative;
  display:inline-flex;align-items:baseline;gap:7px;
  padding:10px 14px 12px;
  font-size:15px;font-weight:700;color:var(--paper);
  transition:color .28s var(--ease);
}
.primary-nav__num{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--muted);transition:color .28s var(--ease)}
.primary-nav__label{white-space:nowrap}
.primary-nav__link::after{
  content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;
  background:transparent;transform:scaleX(0);transform-origin:0 50%;
  transition:transform .28s var(--ease),background-color .28s var(--ease);
}
.primary-nav__link:hover{color:var(--neon)}
.primary-nav__link:hover .primary-nav__num{color:var(--ember)}
.primary-nav__link:hover::after{background:rgba(124,250,74,.55);transform:scaleX(1)}
.primary-nav__link[aria-current="page"]{color:var(--neon)}
.primary-nav__link[aria-current="page"] .primary-nav__num{color:var(--neon)}
.primary-nav__link[aria-current="page"]::after{background:var(--neon);transform:scaleX(1)}

.header-cta{
  display:inline-flex;align-items:center;gap:8px;flex:none;
  padding:10px 20px;
  border:1px solid var(--neon);
  color:var(--neon);
  font-size:14px;font-weight:700;letter-spacing:.04em;white-space:nowrap;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 11px),calc(100% - 11px) 100%,0 100%);
  transition:background-color .28s var(--ease),color .28s var(--ease),transform .28s var(--ease);
}
.header-cta:hover{background:var(--neon);color:#062008;transform:translateX(-4px)}

.nav-toggle{
  display:none;align-items:center;gap:9px;flex:none;
  padding:9px 13px;
  border:1px solid var(--line);color:var(--paper);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  transition:border-color .28s var(--ease),color .28s var(--ease);
}
.nav-toggle__bars{position:relative;display:block;width:16px;height:10px;flex:none}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;right:0;height:2px;background:currentColor;
  transition:transform .28s var(--ease),top .28s var(--ease),bottom .28s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.nav-toggle__text{white-space:nowrap}
.nav-toggle:hover{border-color:var(--neon);color:var(--neon)}
.nav-toggle[aria-expanded="true"]{border-color:var(--neon);color:var(--neon)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{bottom:4px;transform:rotate(-45deg)}

/* ---------- 6. 品牌轨道 ---------- */
.rail{
  position:fixed;left:0;top:0;bottom:0;z-index:70;
  width:var(--rail-w);
  display:flex;flex-direction:column;align-items:flex-start;gap:22px;
  padding:18px 0 22px;
  background:linear-gradient(180deg,#0B0C10,#101B2E 58%,#0B0C10);
  border-right:1px solid var(--line);
  overflow:hidden;
  transition:width .32s var(--ease),box-shadow .32s var(--ease);
}
.rail:hover,.rail:focus-within{width:230px;box-shadow:26px 0 60px -30px rgba(0,0,0,.95)}
.rail__brand{
  display:flex;align-items:center;gap:12px;
  width:100%;padding-left:22px;
}
.rail__brand-mark{
  display:grid;place-items:center;flex:none;
  width:40px;height:40px;
  border:1px solid var(--neon);color:var(--neon);
  font-size:18px;font-weight:900;line-height:1;
  clip-path:polygon(0 0,100% 0,100% 68%,68% 100%,0 100%);
  transition:background-color .28s var(--ease),color .28s var(--ease);
}
.rail__brand:hover .rail__brand-mark{background:var(--neon);color:#062008}
.rail__brand-text{
  font-size:12px;font-weight:700;letter-spacing:.18em;color:var(--paper);white-space:nowrap;
  opacity:0;transform:translateX(-8px);
  transition:opacity .24s var(--ease),transform .24s var(--ease);
}
.rail:hover .rail__brand-text,
.rail:focus-within .rail__brand-text{opacity:1;transform:none}

.rail__nav{display:flex;flex-direction:column;gap:2px;width:100%;flex:1 1 auto}
.rail__link{
  position:relative;
  display:flex;align-items:center;gap:12px;
  padding:11px 12px 11px 22px;
  color:var(--muted);
  transition:color .24s var(--ease),background-color .24s var(--ease);
}
.rail__link::before{
  content:"";position:absolute;left:0;top:50%;
  width:10px;height:1px;background:var(--line);transform:translateY(-50%);
  transition:width .24s var(--ease),background-color .24s var(--ease);
}
.rail__num{flex:none;width:26px;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em}
.rail__label{
  font-size:13px;letter-spacing:.06em;white-space:nowrap;
  opacity:0;transform:translateX(-8px);
  transition:opacity .24s var(--ease),transform .24s var(--ease);
}
.rail:hover .rail__label,
.rail:focus-within .rail__label{opacity:1;transform:none}
.rail__link:hover{color:var(--paper);background:rgba(34,48,74,.4)}
.rail__link:hover::before{width:17px;background:var(--neon)}
.rail__link[aria-current="page"]{color:var(--neon)}
.rail__link[aria-current="page"]::before{width:17px;background:var(--neon)}

.rail__top{
  display:inline-flex;align-items:center;gap:8px;flex:none;
  margin:auto 0 0 22px;
  padding:8px 12px;
  border:1px solid var(--line);color:var(--muted);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;white-space:nowrap;
  opacity:0;visibility:hidden;
  transition:opacity .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease),visibility .24s;
}
.rail__top::before{content:"↑";font-size:13px;line-height:1}
.rail__top.is-on{opacity:1;visibility:visible}
.rail__top:hover{color:var(--neon);border-color:var(--neon)}

/* ---------- 7. footer ---------- */
.site-footer{
  position:relative;z-index:1;
  margin-top:clamp(48px,7vw,96px);
  padding:clamp(40px,6vw,72px) var(--pad-x) 28px;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(16,27,46,.62),rgba(11,12,16,1) 70%);
}
.footer-grid{
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;
  gap:clamp(20px,3vw,44px);
  max-width:var(--shell);margin:0 auto;
}
.footer-brand__name{
  display:inline-block;
  font-size:clamp(22px,2.4vw,30px);font-weight:900;letter-spacing:.02em;
  transform:skewX(-3deg);transform-origin:left bottom;
}
.footer-brand__desc{margin-top:12px;font-size:15px;color:var(--paper);max-width:24em}
.footer-brand__meta{
  margin-top:12px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted);
}
.footer-col__title{
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);font-size:12px;font-weight:500;letter-spacing:.2em;color:var(--neon);
}
.footer-col__list{display:grid;gap:9px;margin-top:14px}
.footer-link{
  display:inline-block;
  font-size:14px;color:var(--muted);
  transition:color .24s var(--ease),transform .24s var(--ease);
}
.footer-link:hover{color:var(--paper);transform:translateX(5px)}

.footer-contact{
  display:grid;grid-template-columns:1.7fr 1fr;gap:20px 44px;align-items:start;
  max-width:var(--shell);margin:clamp(28px,4vw,48px) auto 0;
  padding-top:22px;
  border-top:1px dashed var(--line);
}
.footer-contact__list{display:flex;flex-wrap:wrap;gap:14px 40px}
.footer-contact__item{min-width:0}
.footer-contact__item dt{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--brick);
}
.footer-contact__item dd{margin-top:5px;font-size:14px;color:var(--paper);max-width:24em}
.footer-contact__note{font-size:13px;line-height:1.75;color:var(--muted);max-width:30em}

.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;gap:12px 26px;
  max-width:var(--shell);margin:26px auto 0;
  padding-top:18px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--muted);
}
.footer-legal__icp{color:var(--paper);max-width:none}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:10px 20px}
.footer-legal__links a{padding-bottom:2px;border-bottom:1px solid var(--line);transition:color .24s var(--ease),border-color .24s var(--ease)}
.footer-legal__links a:hover{color:var(--neon);border-color:var(--neon)}
.footer-legal__copy{margin-left:auto;max-width:none}

/* ---------- 8. 通用布局组件 ---------- */
.wrap{
  width:100%;max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--pad-x);
}
.section{position:relative;padding-block:clamp(40px,6vw,84px)}
.section--tight{padding-block:clamp(22px,3vw,40px)}
.section__head{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:12px 20px;
  margin-bottom:clamp(18px,2.4vw,32px);
}

.grid-12{display:grid;grid-template-columns:repeat(12,1fr);gap:clamp(14px,2vw,24px)}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-9{grid-column:span 9}
.span-12{grid-column:span 12}

.rule{
  height:1px;width:100%;
  background:linear-gradient(90deg,transparent,var(--line) 10%,var(--line) 90%,transparent);
  margin-block:clamp(24px,4vw,56px);
}
.rule--slant{position:relative;height:1px;background:none;overflow:visible}
.rule--slant::before{
  content:"";position:absolute;left:0;right:0;top:0;height:1px;
  background:linear-gradient(90deg,var(--line),var(--brick));
  transform:rotate(-1.2deg);transform-origin:left center;
}

/* ---------- 9. 排版组件 ---------- */
.t-display{
  font-size:clamp(40px,7vw,96px);
  line-height:1.02;
  font-weight:900;
  letter-spacing:-.015em;
  transform:skewX(-3deg);
  transform-origin:left bottom;
}
.t-title{
  font-size:clamp(24px,3.4vw,40px);
  line-height:1.14;
  font-weight:900;
  letter-spacing:-.01em;
  transform:skewX(-3deg);
  transform-origin:left bottom;
}
.t-mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}
.lede{font-size:clamp(16px,1.6vw,19px);line-height:1.75;color:var(--paper);max-width:34em}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;color:var(--neon);
}
.eyebrow::before{content:"";display:block;width:26px;height:1px;background:currentColor}
.note{
  writing-mode:vertical-rl;
  font-size:12px;letter-spacing:.24em;line-height:1;color:var(--muted);
  text-transform:uppercase;
}

/* ---------- 10. 按钮 / 标签 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:9px;
  padding:12px 22px;
  border:1px solid var(--line);color:var(--paper);
  font-size:15px;font-weight:700;letter-spacing:.02em;
  transition:color .28s var(--ease),border-color .28s var(--ease),background-color .28s var(--ease),transform .28s var(--ease);
}
.btn:hover{border-color:var(--neon);color:var(--neon);transform:translateX(4px)}
.btn--accent{background:var(--neon);border-color:var(--neon);color:#062008}
.btn--accent:hover{background:var(--white);border-color:var(--white);color:#062008}
.btn--ghost{border-color:var(--neon);color:var(--neon)}

.chip{
  display:inline-flex;align-items:center;gap:7px;
  padding:4px 11px;
  border:1px solid var(--line);color:var(--muted);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
}
.chip--accent{color:var(--neon);border-color:rgba(124,250,74,.42)}
.tag{
  display:inline-block;
  padding:3px 10px;
  background:var(--brick);color:var(--paper);
  font-size:12px;font-weight:700;letter-spacing:.1em;
}

.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:9px;
  padding-block:16px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted);
}
.breadcrumb a{transition:color .24s var(--ease)}
.breadcrumb a:hover{color:var(--neon)}
.breadcrumb__sep{color:var(--line)}
.breadcrumb [aria-current="page"]{color:var(--paper)}

/* ---------- 11. 数据面板 ---------- */
.panel{
  position:relative;
  padding:clamp(16px,2vw,24px);
  border:1px solid var(--line);
  background-color:var(--surface);
  background-image:linear-gradient(180deg,rgba(53,224,208,.07),transparent 62%);
}
.panel--float{transform:rotate(-1.5deg);box-shadow:0 28px 64px -34px rgba(0,0,0,.95)}
.panel--cut{clip-path:polygon(0 0,100% 0,100% calc(100% - 22px),calc(100% - 22px) 100%,0 100%)}
.panel__head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding-bottom:12px;
  border-bottom:1px solid var(--line);
}
.panel__title{font-size:15px;font-weight:700;letter-spacing:.06em}

.metric-row{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(118px,1fr));
  gap:1px;background:var(--line);
  margin-top:16px;
}
.metric{padding:14px 16px;background:var(--ink)}
.metric__value{
  display:block;
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(20px,2.6vw,30px);font-weight:500;line-height:1.1;
  color:var(--neon);
}
.metric__value--ember{color:var(--ember)}
.metric__value--aqua{color:var(--aqua)}
.metric__value--white{color:var(--white)}
.metric__label{display:block;margin-top:5px;font-size:12px;letter-spacing:.12em;color:var(--muted)}

/* ---------- 12. 图片容器 ---------- */
.frame{
  position:relative;display:block;overflow:hidden;
  border:1px solid var(--line);background:var(--surface);
}
.frame img{width:100%;height:100%;object-fit:cover}
.frame--16x9{aspect-ratio:16/9}
.frame--4x3{aspect-ratio:4/3}
.frame--1x1{aspect-ratio:1/1}
.frame--3x4{aspect-ratio:3/4}
.frame--cut{clip-path:polygon(0 0,100% 0,100% calc(100% - 26px),calc(100% - 26px) 100%,0 100%)}
.frame--placeholder::after{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(80% 80% at 70% 20%,rgba(53,224,208,.18),transparent 70%),
    repeating-linear-gradient(135deg,rgba(34,48,74,.55) 0 1px,transparent 1px 13px);
}
.frame__tag{
  position:absolute;left:0;bottom:0;
  padding:6px 13px;
  border-top:1px solid var(--line);border-right:1px solid var(--line);
  background:rgba(11,12,16,.86);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--neon);
}

/* ---------- 13. 筛选 ---------- */
.filter-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding-block:8px}
.filter-chip{
  padding:8px 15px;
  border:1px solid var(--line);color:var(--muted);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  transition:color .28s var(--ease),border-color .28s var(--ease),background-color .28s var(--ease);
}
.filter-chip:hover{color:var(--paper);border-color:var(--neon)}
.filter-chip[aria-pressed="true"]{background:var(--neon);border-color:var(--neon);color:#062008}

/* ---------- 14. 光晕 / 动效基元 ---------- */
.spot{position:relative;isolation:isolate}
.spot::before{
  content:"";position:absolute;left:-8%;right:-8%;top:-10%;height:120%;z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(58% 58% at 72% 12%,rgba(124,250,74,.20),transparent 70%),
    radial-gradient(42% 42% at 18% 78%,rgba(53,224,208,.16),transparent 70%);
  animation:spotBreath 8s ease-in-out infinite;
}
@keyframes spotBreath{0%,100%{opacity:.12}50%{opacity:.2}}
@keyframes chipPulse{0%,100%{opacity:1}50%{opacity:.35}}
@keyframes riseIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}

[data-reveal]{opacity:0;transform:translateY(18px)}
[data-reveal].is-visible{opacity:1;transform:none;transition:opacity .48s var(--ease),transform .48s var(--ease)}
.is-rise{animation:riseIn .48s var(--ease) both}

/* ---------- 15. 响应式：≤1100px ---------- */
@media (max-width:1100px){
  .footer-grid{grid-template-columns:1.3fr 1fr 1fr;}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-template-columns:1fr}
}

/* ---------- 16. 响应式：≤900px（移动抽屉 + 底部快捷条） ---------- */
@media (max-width:900px){
  html{scroll-padding-top:104px}
  body{padding-left:0;padding-bottom:72px}
  .rail{
    top:auto;left:0;right:0;bottom:0;
    width:auto;height:62px;
    flex-direction:row;align-items:center;gap:6px;
    padding:0 10px;
    border-right:0;border-top:1px solid var(--line);
    background:linear-gradient(180deg,rgba(16,27,46,.98),rgba(11,12,16,.99));
    overflow-x:auto;overflow-y:hidden;
    transition:none;
  }
  .rail:hover,.rail:focus-within{width:auto;box-shadow:none}
  .rail__brand{padding-left:0;width:auto;gap:0}
  .rail__brand-mark{width:34px;height:34px;font-size:15px}
  .rail__brand-text{display:none}
  .rail__nav{flex-direction:row;flex:1 1 auto;gap:2px;justify-content:space-between}
  .rail__link{
    flex-direction:column;align-items:center;gap:2px;
    padding:7px 4px;margin:0;flex:1 1 auto;
    justify-content:center;
  }
  .rail__link::before{display:none}
  .rail__link--extra{display:none}
  .rail__num{display:none}
  .rail__label{opacity:1;transform:none;font-size:11px;letter-spacing:.02em}
  .rail__link[aria-current="page"]{box-shadow:inset 0 -2px 0 var(--neon)}
  .rail__top{display:none}

  .header-top{flex-wrap:wrap;gap:6px 14px}
  .brand-line__tag{display:none}
  .header-main{min-height:58px}
  .header-cta{margin-left:auto;padding:9px 14px;font-size:13px}
  .nav-toggle{display:inline-flex}

  .primary-nav{
    position:absolute;left:0;right:0;top:100%;
    display:flex;flex-direction:column;flex-wrap:nowrap;gap:0;
    margin-right:0;
    max-height:calc(100vh - 108px);
    overflow-y:auto;
    padding:8px 18px 20px;
    background:linear-gradient(160deg,rgba(16,27,46,.99),rgba(11,12,16,.99));
    border-bottom:1px solid var(--line);
    box-shadow:0 40px 80px -40px rgba(0,0,0,.95);
    opacity:0;visibility:hidden;pointer-events:none;
    transform:translateY(-12px);
    transition:opacity .32s var(--ease),transform .32s var(--ease),visibility .32s;
  }
  .primary-nav[data-open]{opacity:1;visibility:visible;pointer-events:auto;transform:none}
  .primary-nav__link{
    width:100%;
    padding:15px 4px;
    font-size:20px;font-weight:900;
    border-bottom:1px solid var(--line);
  }
  .primary-nav__link::after{left:4px;right:auto;bottom:7px;width:34px}
  .primary-nav__link[aria-current="page"]::after{transform:scaleX(1)}
  .primary-nav__num{font-size:12px}

  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
  .footer-legal__copy{margin-left:0}
  .note{writing-mode:horizontal-tb;letter-spacing:.14em}
}

/* ---------- 17. 响应式：≤620px ---------- */
@media (max-width:620px){
  body{font-size:16px}
  .header-top__link{display:none}
  .header-cta{padding:8px 12px;font-size:12px}
  .nav-toggle{padding:8px 10px}
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-contact__list{flex-direction:column;gap:14px}
  .footer-legal{gap:10px 18px}
  .grid-12{grid-template-columns:repeat(6,1fr)}
}

/* ---------- 18. 栅格塌陷（统一到单列） ---------- */
@media (max-width:900px){
  .grid-12{grid-template-columns:repeat(6,1fr)}
  .grid-12>*{grid-column:1 / -1}
}

/* ---------- 19. 降低动态效果 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  [data-reveal]{opacity:1;transform:none}
  .spot::before{animation:none;opacity:.14}
  .season-chip__dot{animation:none}
  .rail:hover,.rail:focus-within{transition:none}
}