/* ============================================================
   BET9指南 · 共享站点样式  /assets/site.css
   夜间控制台 × 城市导视：深墨蓝基底 · 电光青索引 · 暖橙行动
   ============================================================ */

:root{
  --ink-900:#0B1B2B;
  --ink-800:#12283D;
  --ink-700:#1A3A52;
  --mist:#B7C3CC;
  --cyan:#35E6D0;
  --cyan-soft:#A6FFF4;
  --orange:#FF8A3D;
  --orange-deep:#D65A1F;
  --paper:#F3E9DA;
  --paper-ink:#152430;
  --text:#F7FBFD;

  --bg:var(--ink-900);
  --surface:var(--ink-800);
  --line:rgba(183,195,204,.16);
  --line-strong:rgba(53,230,208,.34);
  --line-warm:rgba(255,138,61,.40);

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

  --shell:min(1240px,92vw);
  --gutter:clamp(16px,2.4vw,28px);
  --header-h:72px;
  --r-sm:8px;
  --r-md:14px;
  --r-lg:26px;
  --r-pill:999px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scrollbar-color:var(--ink-700) var(--ink-900)}
body{
  margin:0;min-height:100vh;overflow-x:hidden;
  background:var(--ink-900);color:var(--text);
  font-family:var(--font-body);font-size:16px;line-height:1.7;font-weight:400;
  letter-spacing:.01em;-webkit-font-smoothing:antialiased;
}
img,svg,video,canvas{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}
ul,ol{margin:0;padding:0;list-style:none}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
h1,h2,h3,h4,h5{margin:0;font-family:var(--font-display);font-weight:800;line-height:1.06;letter-spacing:-.01em;color:var(--text)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px}
::selection{background:var(--cyan);color:#06121F}

/* ---------- 通用排版 ---------- */
.wrap{width:var(--shell);margin-inline:auto}
.section{padding-block:clamp(40px,6vw,86px);position:relative;scroll-margin-top:calc(var(--header-h) + 18px)}
.section--panel{background:var(--ink-800)}
.section--paper{background:var(--paper);color:var(--paper-ink)}
.section--paper h1,.section--paper h2,.section--paper h3,.section--paper h4{color:#0E1B26}
.section--paper .lede,.section--paper .eyebrow{color:#3D4C57}
.section--paper .rule{border-top-color:rgba(21,36,48,.18)}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;text-transform:uppercase;
  color:var(--cyan);margin-bottom:14px;
}
.eyebrow::before{content:"";width:24px;height:1px;background:currentColor;opacity:.85}
.h-display{font-size:clamp(38px,7vw,78px);line-height:.98;letter-spacing:-.02em}
.h-section{font-size:clamp(26px,3.6vw,42px);line-height:1.08}
.lede{margin-top:16px;font-size:clamp(16px,1.4vw,18px);color:var(--mist);max-width:64ch}
.measure{max-width:76ch}
.rule{border:0;border-top:1px solid var(--line);margin-block:clamp(24px,4vw,44px)}

.grid{display:grid;gap:clamp(16px,2.4vw,32px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr)}

.panel{
  border:1px solid var(--line);border-radius:var(--r-md);
  padding:clamp(18px,2.4vw,28px);
  background:linear-gradient(160deg,rgba(26,58,82,.52),rgba(11,27,43,.24));
}

/* ---------- 索引 ---------- */
.index-list{display:grid;border-top:1px solid var(--line)}
.index-item{
  display:grid;grid-template-columns:auto minmax(0,1fr);gap:clamp(12px,2vw,26px);
  align-items:baseline;padding:16px 2px;border-bottom:1px solid var(--line);
}
.index-item__num{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--cyan);white-space:nowrap}

/* ---------- 时间轴 ---------- */
.timeline{position:relative;display:grid;gap:clamp(18px,2.6vw,32px);padding-left:28px}
.timeline::before{
  content:"";position:absolute;left:6px;top:8px;bottom:8px;width:1px;
  background:linear-gradient(180deg,var(--cyan),rgba(53,230,208,.18) 55%,transparent);
}
.timeline__entry{position:relative}
.timeline__entry::before{
  content:"";position:absolute;left:-26px;top:9px;width:9px;height:9px;border-radius:50%;
  background:var(--ink-900);border:1px solid var(--cyan);box-shadow:0 0 10px rgba(53,230,208,.7);
}
.timeline__meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--mist);margin-bottom:6px}

/* ---------- 徽章 ---------- */
.version-badge{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  padding:4px 10px;border-radius:var(--r-pill);
  border:1px solid var(--line-strong);color:var(--cyan);background:rgba(53,230,208,.08);
}
.status-dot{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 8px var(--cyan);flex:0 0 auto}
.tag{
  display:inline-block;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  padding:4px 10px;border-radius:var(--r-pill);border:1px solid var(--line);color:var(--mist);
}

/* ---------- 图片容器基础规则 ---------- */
.figure{margin:0;display:grid;gap:10px}
.figure__media{
  position:relative;display:block;width:100%;aspect-ratio:16/10;overflow:hidden;
  border:1px solid var(--line);border-radius:var(--r-md);
  background:
    radial-gradient(120% 120% at 18% 0%,rgba(53,230,208,.16),transparent 58%),
    radial-gradient(100% 100% at 100% 100%,rgba(255,138,61,.14),transparent 62%),
    var(--ink-800);
}
.figure__media img{width:100%;height:100%;object-fit:cover}
.figure__caption{font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--mist)}
.figure--device .figure__media{aspect-ratio:4/3;border-radius:var(--r-lg);border-color:var(--line-strong)}
.figure--wide .figure__media{aspect-ratio:21/9}

/* ---------- 横向滑动带 ---------- */
.rail{position:relative}
.rail__track{
  display:flex;gap:clamp(14px,2vw,24px);overflow-x:auto;scroll-snap-type:x mandatory;
  padding-bottom:16px;scrollbar-width:thin;scrollbar-color:var(--line-strong) transparent;
}
.rail__track::-webkit-scrollbar{height:6px}
.rail__track::-webkit-scrollbar-track{background:rgba(183,195,204,.08);border-radius:99px}
.rail__track::-webkit-scrollbar-thumb{background:var(--line-strong);border-radius:99px}
.rail__item{flex:0 0 clamp(240px,30vw,340px);scroll-snap-align:start;min-width:0}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border:1px solid transparent;border-radius:var(--r-pill);
  font-family:var(--font-body);font-size:14px;font-weight:600;letter-spacing:.02em;
  cursor:pointer;white-space:nowrap;
  transition:transform .18s var(--ease),box-shadow .24s ease,background .24s ease,color .24s ease,border-color .24s ease;
}
.btn--primary{
  background:linear-gradient(100deg,var(--cyan) 0%,#7CEFD9 40%,var(--orange) 100%);
  color:#06121F;box-shadow:0 14px 34px -22px rgba(53,230,208,.95);
}
.btn--primary:hover{transform:translateY(-1px);box-shadow:0 20px 42px -20px rgba(255,138,61,.85)}
.btn--primary:active{transform:translateY(0);background:linear-gradient(100deg,#24C6B3,#D65A1F)}
.btn--ghost{border-color:var(--line-strong);color:var(--cyan)}
.btn--ghost:hover{background:rgba(53,230,208,.1);border-color:var(--cyan);transform:translateY(-1px)}
.btn--quiet{border-color:var(--line);color:var(--mist)}
.btn--quiet:hover{color:var(--text);border-color:var(--mist)}
.btn--block{width:100%}

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding-block:18px;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--mist);
}
.breadcrumbs__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs__item::after{content:"/";color:var(--ink-700)}
.breadcrumbs__item:last-child::after{content:""}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs [aria-current="page"]{color:var(--text)}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:12px 18px;border-radius:var(--r-pill);
  background:var(--cyan);color:#06121F;font-weight:700;font-size:14px;
  transform:translateY(-160%);transition:transform .2s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

/* ============================================================
   页头 · 框架横梁
   ============================================================ */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(11,27,43,.88);
  -webkit-backdrop-filter:blur(14px) saturate(150%);
  backdrop-filter:blur(14px) saturate(150%);
  border-bottom:1px solid var(--line);
  transition:border-color .3s ease,box-shadow .3s ease,background .3s ease;
}
.site-header.is-stuck{
  border-bottom-color:var(--line-strong);
  box-shadow:0 20px 44px -38px rgba(53,230,208,.9),inset 0 -1px 0 rgba(53,230,208,.22);
}
.scroll-progress{
  position:absolute;left:0;bottom:-1px;width:100%;height:2px;z-index:2;
  background:linear-gradient(90deg,var(--cyan),var(--cyan-soft) 45%,var(--orange));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .12s linear;
  pointer-events:none;
}
.site-header__inner{
  position:relative;
  width:var(--shell);margin-inline:auto;min-height:var(--header-h);
  display:flex;align-items:center;gap:clamp(10px,1.8vw,30px);
}

/* 品牌锁定 */
.brand-lockup{display:flex;align-items:center;gap:12px;flex:0 0 auto;padding-block:8px}
.brand-lockup__mark{
  position:relative;width:26px;height:26px;flex:0 0 auto;
  border:1px solid var(--line-strong);border-radius:7px;
  background:linear-gradient(150deg,rgba(53,230,208,.28),rgba(255,138,61,.18));
}
.brand-lockup__mark::after{
  content:"";position:absolute;inset:0;margin:auto;width:8px;height:8px;border-radius:2px;
  background:var(--cyan);box-shadow:0 0 12px var(--cyan);
}
.brand-lockup__text{display:block;line-height:1.1;min-width:0}
.brand-lockup__name{
  display:block;font-family:var(--font-display);font-weight:800;
  font-size:20px;letter-spacing:.04em;color:var(--text);
}
.brand-lockup__sub{
  display:block;margin-top:3px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.18em;color:var(--mist);
}

/* 导航 */
.nav{display:flex;align-items:center;gap:clamp(8px,1.4vw,22px);margin-left:auto;min-width:0}
.nav__list{display:flex;align-items:center;gap:clamp(0px,.7vw,10px);min-width:0}
.nav__item{flex:0 0 auto}
.nav__link{
  position:relative;display:inline-block;padding:12px 10px;
  font-size:15px;color:var(--mist);white-space:nowrap;
  transition:color .2s ease;
}
.nav__link::after{
  content:"";position:absolute;left:10px;right:10px;bottom:6px;height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  transform:scaleX(0);transform-origin:left center;transition:transform .26s var(--ease);
}
.nav__link:hover,.nav__link:focus-visible{color:var(--text)}
.nav__link:hover::after,.nav__link:focus-visible::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--text)}
.nav__link[aria-current="page"]::after{transform:scaleX(1)}

.nav__utility{
  display:flex;align-items:center;gap:14px;
  padding-left:clamp(8px,1.2vw,18px);border-left:1px solid var(--line);
}
.nav__utility-link{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:var(--mist);white-space:nowrap;transition:color .2s ease;
}
.nav__utility-link:hover,.nav__utility-link:focus-visible{color:var(--cyan)}
.nav__cta{flex:0 0 auto}

/* 手机端品牌服务胶囊 */
.service-pill{
  display:none;align-items:center;gap:7px;
  padding:8px 12px;border-radius:var(--r-pill);
  border:1px solid var(--line-strong);background:rgba(53,230,208,.08);
  color:var(--cyan);font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  white-space:nowrap;transition:background .2s ease,border-color .2s ease;
}
.service-pill::before{
  content:"";width:6px;height:6px;border-radius:50%;flex:0 0 auto;
  background:var(--cyan);box-shadow:0 0 8px var(--cyan);
  animation:pill-pulse 2.6s ease-in-out infinite;
}
.service-pill:hover,.service-pill:focus-visible{background:rgba(53,230,208,.18);border-color:var(--cyan)}
@keyframes pill-pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.45;transform:scale(.82)}}

/* 汉堡按钮 */
.nav-toggle{
  display:none;align-items:center;justify-content:center;
  width:44px;height:44px;flex:0 0 auto;cursor:pointer;
  border:1px solid var(--line);border-radius:calc(var(--r-sm) + 4px);
  background:rgba(26,58,82,.55);
  transition:border-color .2s ease,background .2s ease;
}
.nav-toggle:hover{border-color:var(--line-strong);background:rgba(53,230,208,.1)}
.nav-toggle__bars,.nav-toggle__bars::before,.nav-toggle__bars::after{
  display:block;width:18px;height:2px;border-radius:2px;background:var(--cyan);
  transition:transform .26s var(--ease),opacity .2s ease,background .2s ease;
}
.nav-toggle__bars{position:relative}
.nav-toggle__bars::before,.nav-toggle__bars::after{content:"";position:absolute;left:0}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(48px,8vw,110px);
  background:linear-gradient(180deg,var(--ink-800),var(--ink-900) 72%);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(900px 320px at 10% -10%,rgba(53,230,208,.15),transparent 70%),
    radial-gradient(720px 300px at 90% 0%,rgba(255,138,61,.13),transparent 72%);
}
.site-footer__inner{
  position:relative;width:var(--shell);margin-inline:auto;
  padding:clamp(36px,6vw,74px) 0 clamp(20px,3vw,34px);
}
.site-footer__top{
  display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1.65fr);
  gap:clamp(28px,5vw,72px);align-items:start;
}
.site-footer__name{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(26px,3.4vw,38px);letter-spacing:.02em;line-height:1.05;color:var(--text);
  margin:0 0 14px;
}
.site-footer__summary{margin:0;max-width:36ch;color:var(--mist);font-size:15px;line-height:1.75}
.site-footer__stamp{
  display:inline-flex;align-items:center;gap:8px;margin:18px 0 0;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--mist);
}
.site-footer__cols{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(20px,4vw,48px)}
.footer-col__title{
  margin:0 0 16px;font-family:var(--font-mono);font-weight:500;
  font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--cyan);
}
.footer-col__list{display:grid;gap:10px}
.footer-link{
  display:inline-flex;align-items:center;gap:8px;
  font-size:15px;color:var(--mist);transition:color .2s ease;
}
.footer-link::before{
  content:"";width:10px;height:1px;flex:0 0 auto;
  background:var(--line-strong);transition:width .22s var(--ease),background .22s ease;
}
.footer-link:hover,.footer-link:focus-visible{color:var(--text)}
.footer-link:hover::before,.footer-link:focus-visible::before{width:20px;background:var(--orange)}
.site-footer__meta{
  margin-top:clamp(28px,4vw,50px);padding-top:20px;
  border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 26px;
}
.site-footer__legal,.site-footer__contact{
  margin:0;font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:var(--mist);line-height:1.6;
}
.site-footer__contact{color:rgba(183,195,204,.82)}

/* ============================================================
   显现动效
   ============================================================ */
html.has-js .reveal{
  opacity:0;transform:translateY(18px);
  transition:opacity .62s var(--ease),transform .62s var(--ease);
  will-change:opacity,transform;
}
html.has-js .reveal.is-visible{opacity:1;transform:none}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1080px){
  .nav__utility{display:none}
  .brand-lockup__sub{display:none}
  .nav__link{padding:12px 8px;font-size:14px}
}

@media (max-width:900px){
  :root{--header-h:64px}
  .site-header__inner{gap:10px;min-height:var(--header-h)}
  .brand-lockup__name{font-size:18px}
  .service-pill{display:inline-flex;margin-left:auto}
  .nav-toggle{display:inline-flex}

  .nav{
    position:absolute;left:0;right:0;top:100%;z-index:90;
    flex-direction:column;align-items:stretch;gap:0;margin-left:0;
    padding:8px 4vw 22px;
    background:linear-gradient(180deg,rgba(9,22,35,.99),rgba(11,27,43,.98));
    border-bottom:1px solid var(--line-strong);
    box-shadow:0 34px 64px -44px #000;
    max-height:0;overflow:hidden;opacity:0;visibility:hidden;
    transition:max-height .38s var(--ease),opacity .24s ease,visibility .26s linear;
  }
  .site-header[data-open="true"] .nav{
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;opacity:1;visibility:visible;
  }

  .nav__list{flex-direction:column;align-items:stretch;gap:0;padding-block:4px}
  .nav__item{width:100%}
  .nav__link{
    display:block;padding:14px 4px;font-size:17px;color:var(--text);
    border-bottom:1px solid rgba(183,195,204,.12);
  }
  .nav__link::after{left:4px;right:auto;width:28px;bottom:9px}
  .nav__link[aria-current="page"]{color:var(--cyan)}

  .nav__utility{
    display:flex;flex-direction:column;align-items:flex-start;gap:10px;
    padding:16px 4px 0;border-left:0;
  }
  .nav__utility-link{font-size:13px;letter-spacing:.06em}

  .nav__cta{margin-top:18px;width:100%}

  .grid--2,.grid--3,.grid--split{grid-template-columns:1fr}
}

@media (max-width:820px){
  .site-footer__top{grid-template-columns:1fr}
  .site-footer__cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .site-footer__meta{flex-direction:column;align-items:flex-start}
}

@media (max-width:560px){
  .rail__item{flex-basis:min(86vw,320px)}
  .site-footer__cols{grid-template-columns:1fr;gap:26px}
  .service-pill{font-size:11px;padding:7px 10px}
  .index-item{grid-template-columns:1fr;gap:4px}
}

/* ============================================================
   无障碍：减弱动态
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  html.has-js .reveal{opacity:1;transform:none}
  .scroll-progress{transition:none}
  .nav{transition:none}
  .service-pill::before{animation:none}
}