/* ==========================================================================
   乐鱼体育 · 共享外壳样式 /assets/site.css
   分区：变量 → 重置 → 排版 → 布局 → 组件 → 头部轨道 → 页脚 → 动效与无障碍
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root{
  --abyss:#05121F;
  --deep-sea:#0B2A4A;
  --harbor-blue:#14507F;
  --signal-blue:#3D8BFF;
  --pulse-orange:#FF6A18;
  --aqua-glow:#25E0C6;
  --gold-mark:#FFC24B;
  --mist:#EEF4FB;
  --paper:#FFFFFF;
  --graphite:#12202F;
  --slate:#5A6B80;
  --line-mist:#D6E3F2;

  --font-display:'Noto Sans SC','Source Han Sans SC','HarmonyOS Sans',system-ui,-apple-system,sans-serif;
  --font-body:'Noto Sans SC','HarmonyOS Sans',system-ui,-apple-system,'Segoe UI',sans-serif;
  --font-mono:'JetBrains Mono','IBM Plex Mono',Menlo,Consolas,monospace;

  --rail-w:296px;
  --bar-h:70px;
  --content-w:1200px;
  --content-narrow:760px;

  --radius-xl:32px;
  --radius-lg:24px;
  --radius-md:16px;
  --pill:999px;

  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-card:0 26px 54px -34px rgba(0,0,0,.9);
  --shadow-cta:0 16px 32px -16px rgba(255,106,24,.9);

  --scroll-progress:0;
}

/* ---------- 2. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--abyss);
  color:var(--mist);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{list-style:none;padding:0}
img,svg,video{max-width:100%;display:block;height:auto}
a{color:inherit;background:none}
button{font:inherit;color:inherit}
table{border-collapse:collapse;width:100%}
#main-content{display:block;scroll-margin-top:calc(var(--bar-h) + 12px)}

/* ---------- 3. 排版 ---------- */
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.2;letter-spacing:-.02em}
.display{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(44px,7vw,96px);
  line-height:1.02;
  letter-spacing:-.04em;
  transform:skewX(-3deg);
  transform-origin:left bottom;
}
.mono{font-family:var(--font-mono);font-weight:500;font-variant-numeric:tabular-nums}
.text-muted{color:var(--slate)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- 4. 布局：容器 / 分区 / 网格 ---------- */
.container{width:min(100% - 40px,var(--content-w));margin-inline:auto}
.container--narrow{width:min(100% - 40px,var(--content-narrow));margin-inline:auto}

.section{position:relative;padding:64px 0;background:var(--abyss);color:var(--mist)}
.section--deep{background:linear-gradient(180deg,var(--deep-sea) 0%,var(--abyss) 100%)}
.section--light{background:linear-gradient(180deg,var(--mist) 0%,var(--paper) 100%);color:var(--graphite)}
.section > *{position:relative;z-index:1}
.section__head{display:flex;flex-direction:column;gap:14px;max-width:760px;margin-bottom:40px}
.section__title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(32px,4.6vw,56px);
  line-height:1.08;
  letter-spacing:-.03em;
  transform:skewX(-3deg);
  transform-origin:left bottom;
}
.section__desc{font-size:17px;color:rgba(238,244,251,.72);max-width:62ch}
.section--light .section__desc{color:var(--slate)}

.grid{display:grid;gap:24px}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.grid--4{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.grid--asym{grid-template-columns:1fr}

.divider{height:1px;border:0;margin:0;background:linear-gradient(90deg,transparent,rgba(214,227,242,.35),transparent)}

/* ---------- 5. 通用组件 ---------- */
/* 5.1 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:var(--pill);border:1px solid transparent;
  font-size:15px;font-weight:700;line-height:1.2;letter-spacing:.01em;
  text-decoration:none;white-space:nowrap;cursor:pointer;
  transition:transform .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.btn--block{width:100%}
.btn--primary{background:linear-gradient(120deg,var(--pulse-orange),#FF9143);color:var(--abyss);box-shadow:var(--shadow-cta)}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 20px 38px -16px rgba(255,106,24,1)}
.btn--ghost{background:transparent;border-color:rgba(37,224,198,.45);color:var(--aqua-glow)}
.btn--ghost:hover{background:rgba(37,224,198,.12);border-color:var(--aqua-glow);transform:translateY(-2px)}
.btn--gold{background:rgba(255,194,75,.10);border-color:rgba(255,194,75,.55);color:var(--gold-mark)}
.btn--gold:hover{background:rgba(255,194,75,.2);transform:translateY(-2px)}

/* 5.2 展签标签 / 胶囊 */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--aqua-glow);
}
.eyebrow::before{content:"";width:24px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--aqua-glow),var(--pulse-orange))}
.tag{
  display:inline-flex;align-items:center;gap:6px;padding:5px 14px;border-radius:var(--pill);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  background:rgba(61,139,255,.16);border:1px solid rgba(61,139,255,.35);color:#CFE6FF;
}
.tag--aqua{background:rgba(37,224,198,.14);border-color:rgba(37,224,198,.42);color:#A9FFF1}
.tag--gold{background:rgba(255,194,75,.14);border-color:rgba(255,194,75,.45);color:#FFE0A3}

.pill-group{display:flex;flex-wrap:wrap;gap:10px}
.pill{
  appearance:none;cursor:pointer;padding:8px 18px;border-radius:var(--pill);
  border:1px solid rgba(214,227,242,.26);background:rgba(5,18,31,.42);
  color:var(--mist);font-size:14px;font-weight:600;
  transition:background-color .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease),box-shadow .2s var(--ease);
}
.pill:hover{border-color:rgba(37,224,198,.6)}
.pill[aria-pressed="true"]{border-color:var(--aqua-glow);background:rgba(37,224,198,.16);color:var(--paper);box-shadow:0 0 0 1px rgba(37,224,198,.35)}

/* 5.3 展签数据卡 */
.placard{
  position:relative;display:flex;flex-direction:column;gap:6px;
  padding:22px 24px;border-radius:var(--radius-lg);
  background:linear-gradient(150deg,rgba(20,80,127,.4),rgba(5,18,31,.72));
  border:1px dashed rgba(255,194,75,.45);
  transition:transform .24s var(--ease),border-color .24s var(--ease);
}
.placard:hover{transform:translateY(-2px);border-color:var(--gold-mark)}
.placard__label{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--gold-mark)}
.placard__value{font-family:var(--font-display);font-weight:900;font-size:clamp(30px,4vw,44px);line-height:1;color:var(--paper);letter-spacing:-.02em}
.placard__note{font-size:15px;color:rgba(238,244,251,.72)}

/* 5.4 信息卡 */
.card{
  position:relative;display:flex;flex-direction:column;gap:12px;
  padding:26px;border-radius:var(--radius-xl);
  background:rgba(11,42,74,.72);
  border:1px solid rgba(214,227,242,.14);
  transition:transform .24s var(--ease),border-color .24s var(--ease),box-shadow .24s var(--ease);
}
.card:hover{transform:translateY(-2px);border-color:rgba(37,224,198,.55);box-shadow:var(--shadow-card)}
.card__label{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--aqua-glow)}
.card__title{font-family:var(--font-display);font-weight:800;font-size:22px;line-height:1.3}
.card__text{font-size:16px;color:rgba(238,244,251,.74)}
.section--light .card{background:var(--paper);border-color:var(--line-mist);color:var(--graphite);box-shadow:0 20px 44px -36px rgba(5,18,31,.55)}
.section--light .card__text{color:var(--slate)}
.section--light .card__label{color:var(--harbor-blue)}

/* 5.5 目录索引行 */
.index-list{border-top:1px solid rgba(214,227,242,.16)}
.index-row{border-bottom:1px solid rgba(214,227,242,.16)}
.index-row__link{
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:16px;
  padding:20px 8px;text-decoration:none;color:inherit;
  transition:background-color .2s var(--ease),padding-left .2s var(--ease);
}
.index-row__link:hover{background:rgba(61,139,255,.10);padding-left:16px}
.index-row__num{font-family:var(--font-mono);font-size:13px;color:var(--aqua-glow)}
.index-row__title{font-family:var(--font-display);font-weight:800;font-size:20px;letter-spacing:-.01em}
.index-row__desc{margin-top:4px;font-size:15px;color:var(--slate)}
.index-row__arrow{font-family:var(--font-mono);color:var(--pulse-orange);transition:transform .2s var(--ease)}
.index-row__link:hover .index-row__arrow{transform:translateX(4px)}

/* 5.6 分段切换 */
.tabs{display:flex;flex-direction:column;gap:22px}
.tabs__list{
  display:flex;flex-wrap:wrap;gap:8px;width:fit-content;max-width:100%;
  padding:6px;border-radius:var(--pill);
  background:rgba(11,42,74,.8);border:1px solid rgba(214,227,242,.14);
}
.tabs__tab{
  appearance:none;cursor:pointer;border:0;border-radius:var(--pill);
  padding:10px 20px;background:transparent;color:rgba(238,244,251,.7);
  font-size:15px;font-weight:700;
  transition:background-color .18s var(--ease),color .18s var(--ease);
}
.tabs__tab:hover{color:var(--paper)}
.tabs__tab[aria-selected="true"]{background:linear-gradient(120deg,var(--pulse-orange),#FF9143);color:var(--abyss)}
.tabs__panel{padding-top:4px;outline:none}
.tabs__panel[hidden]{display:none}
.tabs__panel.is-active{animation:tabIn .18s var(--ease) both}
@keyframes tabIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* 5.7 面包屑 */
.breadcrumb{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:10px;color:var(--slate)}
.breadcrumb__item{display:flex;align-items:center;gap:10px}
.breadcrumb__item:not(:first-child)::before{content:"/";color:rgba(90,107,128,.65)}
.breadcrumb__link{color:var(--signal-blue);text-decoration:none}
.breadcrumb__link:hover{text-decoration:underline}
.breadcrumb__current{color:var(--slate)}

/* 5.8 正文容器 */
.prose{max-width:70ch;font-size:17px;line-height:1.85;color:var(--graphite)}
.prose > * + *{margin-top:1.1em}
.prose h2{font-size:28px;margin-top:1.8em}
.prose h3{font-size:21px;margin-top:1.5em}
.prose ul,.prose ol{padding-left:1.3em;list-style:disc}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.4em}
.prose a{color:var(--harbor-blue);text-decoration:underline;text-underline-offset:3px}
.prose strong{font-weight:800}
.section--dark .prose,.section--deep .prose{color:rgba(238,244,251,.82)}
.section--dark .prose a,.section--deep .prose a{color:var(--aqua-glow)}

/* 5.9 图片容器 */
.media-frame{
  position:relative;overflow:hidden;border-radius:var(--radius-xl);aspect-ratio:16/9;
  background:linear-gradient(140deg,rgba(20,80,127,.55),rgba(5,18,31,.9));
  border:1px solid rgba(214,227,242,.16);
}
.media-frame::before{
  content:"";position:absolute;inset:10px;z-index:2;pointer-events:none;
  border:1px dashed rgba(37,224,198,.28);border-radius:calc(var(--radius-xl) - 10px);
}
.media-frame__img{width:100%;height:100%;object-fit:cover}
.media-frame__caption{
  position:absolute;left:18px;bottom:16px;z-index:3;
  padding:6px 14px;border-radius:var(--pill);
  background:rgba(5,18,31,.74);color:var(--mist);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}

/* 5.10 路径条与光晕 */
.path-strip{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:18px;
  padding:26px 30px;border-radius:var(--radius-xl);
  background:linear-gradient(120deg,rgba(20,80,127,.5),rgba(5,18,31,.88));
  border:1px solid rgba(37,224,198,.28);
}
.path-strip__label{font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;color:var(--aqua-glow);margin-bottom:6px}
.path-strip__title{font-family:var(--font-display);font-weight:800;font-size:22px;letter-spacing:-.01em}

.glow{
  position:absolute;z-index:0;pointer-events:none;
  width:min(60vw,620px);aspect-ratio:1;border-radius:50%;
  background:radial-gradient(circle at 50% 50%,rgba(37,224,198,.28),rgba(61,139,255,.14) 45%,transparent 70%);
  filter:blur(10px);
  animation:glowBreath 8s ease-in-out infinite;
}
.glow--orange{background:radial-gradient(circle at 50% 50%,rgba(255,106,24,.26),transparent 68%)}
@keyframes glowBreath{
  0%,100%{transform:translate3d(0,0,0) scale(1)}
  50%{transform:translate3d(0,-3%,0) scale(1.04)}
}

/* ---------- 6. 头部：移动端顶部条 + 全屏抽屉（默认） ---------- */
.skip-link{
  position:fixed;left:50%;top:0;z-index:200;
  transform:translate(-50%,-140%);
  padding:12px 22px;border-radius:0 0 var(--radius-md) var(--radius-md);
  background:var(--aqua-glow);color:var(--abyss);font-weight:700;text-decoration:none;
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translate(-50%,0)}

.site-header{
  position:sticky;top:0;z-index:90;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  min-height:var(--bar-h);
  padding:10px 16px;
  background:linear-gradient(120deg,rgba(5,18,31,.97),rgba(11,42,74,.97));
  border-bottom:1px solid rgba(37,224,198,.18);
  backdrop-filter:blur(12px);
}
.rail-brand{display:flex;align-items:center;min-width:0}

.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:inherit;padding:4px;border-radius:var(--radius-md)}
.brand__mark{
  display:grid;place-items:center;flex:0 0 auto;
  width:46px;height:46px;border-radius:var(--radius-md);
  background:linear-gradient(140deg,var(--pulse-orange),var(--aqua-glow));
  color:var(--abyss);font-family:var(--font-mono);font-weight:700;font-size:16px;
  box-shadow:0 12px 26px -14px rgba(37,224,198,.9);
}
.brand__text{display:flex;flex-direction:column;min-width:0;line-height:1.2}
.brand__name{display:block;font-family:var(--font-display);font-weight:900;font-size:19px;letter-spacing:-.02em;transform:skewX(-3deg);transform-origin:left bottom}
.brand__sub{display:block;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.08em;color:rgba(238,244,251,.58);white-space:nowrap}
.brand--footer .brand__mark{width:42px;height:42px;font-size:15px}
.brand--footer .brand__name{font-size:18px}

.rail-nav{
  position:fixed;left:0;right:0;top:var(--bar-h);bottom:0;z-index:88;
  display:flex;flex-direction:column;gap:16px;
  padding:24px 20px 140px;overflow-y:auto;
  background:linear-gradient(180deg,var(--abyss),#07182A 60%,var(--abyss));
  transform:translateY(-10px);opacity:0;visibility:hidden;
  transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s linear;
}
.rail-nav__label{font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:rgba(37,224,198,.78)}
.rail-nav__list{display:flex;flex-direction:column;gap:6px}
.rail-nav__item{display:block}
.rail-nav__link{
  position:relative;display:grid;grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;gap:12px;padding:12px 16px;border-radius:var(--radius-md);
  color:rgba(238,244,251,.74);text-decoration:none;font-weight:700;font-size:16px;
  transition:background-color .2s var(--ease),color .2s var(--ease);
}
.rail-nav__link::after{
  content:"→";font-family:var(--font-mono);font-size:13px;color:var(--pulse-orange);
  opacity:0;transform:translateX(-4px);
  transition:opacity .2s var(--ease),transform .2s var(--ease);
}
.rail-nav__link:hover{background:rgba(61,139,255,.14);color:var(--paper)}
.rail-nav__link:hover::after{opacity:1;transform:translateX(0)}
.rail-nav__num{font-family:var(--font-mono);font-size:12px;color:var(--aqua-glow)}
.rail-nav__text{letter-spacing:.01em}
.rail-nav__link[aria-current="page"]{
  background:linear-gradient(100deg,rgba(255,106,24,.22),rgba(37,224,198,.08));
  color:var(--paper);
  box-shadow:inset 0 0 0 1px rgba(255,106,24,.45);
}
.rail-nav__link[aria-current="page"] .rail-nav__num{color:var(--gold-mark)}
.rail-nav__link[aria-current="page"]::after{opacity:1;transform:translateX(0)}

.rail-actions{
  position:fixed;left:0;right:0;bottom:0;z-index:89;
  display:flex;flex-direction:column;gap:10px;
  padding:20px 20px 26px;
  background:linear-gradient(180deg,rgba(5,18,31,0),rgba(5,18,31,.94) 34%,var(--abyss));
  transform:translateY(16px);opacity:0;visibility:hidden;
  transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s linear;
}

.site-header[data-open] .rail-nav,
.site-header[data-open] .rail-actions{opacity:1;visibility:visible;transform:none}

.nav-toggle{
  display:inline-flex;align-items:center;gap:10px;flex:0 0 auto;
  padding:10px 16px;border-radius:var(--pill);cursor:pointer;
  border:1px solid rgba(37,224,198,.42);background:rgba(11,42,74,.85);color:var(--mist);
}
.nav-toggle__bars{display:inline-flex;flex-direction:column;justify-content:center;gap:4px;width:18px;height:14px}
.nav-toggle__bars span{display:block;height:2px;border-radius:2px;background:currentColor;transition:transform .22s var(--ease),opacity .22s var(--ease)}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle__text{font-size:14px;font-weight:700;letter-spacing:.04em}

.rail-progress{
  position:fixed;left:0;right:0;top:calc(var(--bar-h) - 2px);z-index:92;
  height:2px;background:rgba(214,227,242,.10);
}
.rail-progress__fill{
  display:block;height:100%;width:calc(var(--scroll-progress) * 100%);
  background:linear-gradient(90deg,var(--aqua-glow),var(--pulse-orange));
  transition:width .12s linear;
}
.rail-progress__dot{display:none}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  position:relative;overflow:hidden;
  padding:64px 0 28px;
  background:linear-gradient(178deg,var(--deep-sea) 0%,var(--abyss) 62%,#040E18 100%);
  color:var(--mist);
}
.site-footer::before{
  content:"";position:absolute;inset:0 0 auto 0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(37,224,198,.55),rgba(255,106,24,.5),transparent);
}
.site-footer__glow{
  position:absolute;top:-160px;right:-120px;width:min(70vw,520px);aspect-ratio:1;border-radius:50%;
  background:radial-gradient(circle,rgba(37,224,198,.18),transparent 68%);
  pointer-events:none;
}
.site-footer__inner{
  position:relative;z-index:1;
  width:min(100% - 40px,var(--content-w));margin-inline:auto;
  display:flex;flex-direction:column;gap:44px;
}

.footer-lead{display:grid;gap:28px}
.footer-brand{display:flex;flex-direction:column;gap:14px;align-items:flex-start}
.footer-brand__slogan{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(20px,2.4vw,26px);line-height:1.4;letter-spacing:-.02em;
  color:var(--paper);max-width:22ch;
}
.footer-stats{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(140px,1fr))}
.stat-card{
  display:flex;flex-direction:column;gap:4px;
  padding:16px 18px;border-radius:var(--radius-lg);
  background:rgba(11,42,74,.55);border:1px solid rgba(214,227,242,.14);
  transition:border-color .24s var(--ease),transform .24s var(--ease);
}
.stat-card:hover{border-color:rgba(37,224,198,.5);transform:translateY(-2px)}
.stat-card__num{font-size:24px;font-weight:700;line-height:1.1;color:var(--gold-mark);letter-spacing:-.01em}
.stat-card__label{font-size:13.5px;color:rgba(238,244,251,.68);line-height:1.5}

.footer-grid{display:grid;gap:32px 24px;grid-template-columns:1fr}
.footer-col{display:flex;flex-direction:column;gap:14px;min-width:0}
.footer-col__title{
  display:flex;align-items:center;gap:8px;
  font-size:13px;font-weight:700;letter-spacing:.14em;color:var(--aqua-glow);
}
.footer-col__num{font-size:11px;color:rgba(238,244,251,.42)}
.footer-col__list{display:flex;flex-direction:column;gap:10px}
.footer-col__link{
  display:inline-block;font-size:15px;color:rgba(238,244,251,.72);text-decoration:none;
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.footer-col__link:hover{color:var(--paper);transform:translateX(3px)}
.footer-col--contact{border-top:1px solid rgba(214,227,242,.14);padding-top:22px}

.contact-list{display:flex;flex-direction:column;gap:14px}
.contact-list__item{display:flex;flex-direction:column;gap:3px}
.contact-list__label{font-size:11px;letter-spacing:.16em;color:rgba(37,224,198,.82)}
.contact-list__value{font-size:15px;color:rgba(238,244,251,.86);line-height:1.6;word-break:break-word}
.footer-col__note{font-size:13.5px;line-height:1.7;color:var(--slate)}

.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;
  padding-top:22px;border-top:1px solid rgba(214,227,242,.14);
  font-size:13px;color:rgba(238,244,251,.6);
}
.footer-bottom__copy{color:rgba(238,244,251,.72)}
.footer-bottom__icp{letter-spacing:.04em}
.footer-bottom__links{display:flex;flex-wrap:wrap;gap:18px}
.footer-bottom__link{color:rgba(238,244,251,.72);text-decoration:none}
.footer-bottom__link:hover{color:var(--aqua-glow);text-decoration:underline;text-underline-offset:3px}

/* ---------- 8. 动效协议 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .28s var(--ease),transform .28s var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 9. 焦点与可访问性 ---------- */
:focus-visible{outline:2px solid var(--aqua-glow);outline-offset:3px;border-radius:6px}
.site-header :focus-visible{outline-color:var(--gold-mark)}

/* ---------- 10. 平板 ---------- */
@media (min-width:640px){
  .section{padding:80px 0}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-col--contact{grid-column:1 / -1}
  .footer-bottom{font-size:13.5px}
}

/* ---------- 11. 桌面：侧边轨道常驻 ---------- */
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  #main-content{scroll-margin-top:24px}

  .site-header{
    position:fixed;left:0;top:0;bottom:0;
    width:var(--rail-w);min-height:0;
    flex-direction:column;align-items:stretch;justify-content:flex-start;
    gap:26px;padding:32px 24px;
    background:linear-gradient(180deg,var(--abyss) 0%,var(--deep-sea) 55%,var(--abyss) 100%);
    border-bottom:0;border-right:1px solid rgba(214,227,242,.14);
    overflow-y:auto;overflow-x:hidden;
    backdrop-filter:none;
  }
  .rail-brand{padding-bottom:22px;border-bottom:1px solid rgba(214,227,242,.14)}
  .brand__sub{font-size:11px}

  .rail-nav{
    position:static;flex:1 1 auto;min-height:0;
    padding:0;overflow:visible;
    background:none;opacity:1;visibility:visible;transform:none;
    transition:none;
  }
  .rail-nav__link{padding:11px 14px;font-size:16px}
  .rail-nav__link[aria-current="page"]::before{
    content:"";position:absolute;left:-8px;top:50%;
    width:4px;height:22px;border-radius:2px;background:var(--pulse-orange);
    transform:translateY(-50%);
  }

  .rail-actions{
    position:static;z-index:auto;
    padding:20px 0 0;background:none;
    border-top:1px solid rgba(214,227,242,.14);
    opacity:1;visibility:visible;transform:none;transition:none;
  }

  .nav-toggle{display:none}

  .rail-progress{
    position:fixed;top:0;bottom:0;right:auto;
    left:calc(var(--rail-w) - 3px);
    width:3px;height:auto;
    background:rgba(214,227,242,.10);
  }
  .rail-progress__fill{
    position:absolute;top:0;left:0;width:100%;
    height:calc(var(--scroll-progress) * 100%);
    transition:height .12s linear;
  }
  .rail-progress__dot{
    display:block;position:absolute;left:50%;
    top:calc(var(--scroll-progress) * 100%);
    width:11px;height:11px;border-radius:50%;
    background:var(--aqua-glow);
    box-shadow:0 0 0 4px rgba(37,224,198,.18),0 0 20px rgba(37,224,198,.85);
    transform:translate(-50%,-50%);
    transition:top .12s linear;
  }

  .section{padding:104px 0}
  .section__head{margin-bottom:52px}
  .grid{gap:28px}
  .grid--asym{grid-template-columns:1.35fr .85fr;gap:40px}

  .site-footer{padding:88px 0 32px}
  .site-footer__inner{gap:56px}
  .footer-lead{grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);align-items:center;gap:48px}
  .footer-grid{grid-template-columns:repeat(4,minmax(0,1fr)) 1.35fr;gap:36px 28px}
  .footer-col--contact{grid-column:auto;border-top:0;padding-top:0;border-left:1px solid rgba(214,227,242,.14);padding-left:28px}
}

@media (min-width:1320px){
  :root{--rail-w:320px}
}

/* ---------- 12. 降级动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1 !important;transform:none !important}
  .glow{animation:none}
  .rail-progress__fill,.rail-progress__dot{transition:none}
}