/* ============================================================
   BOB赛场 · 共享站点样式 /assets/site.css
   夜场灯光 + 电子记分牌：深蓝底、荧光青数据流、橙红关键数据
   ============================================================ */

*,*::before,*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%}

body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}

:root{
  --ink:#06182B;
  --ink-2:#0B2742;
  --ink-3:#04101C;
  --cyan:#22E0D6;
  --cyan-soft:#9CF6F0;
  --flare:#FF5A36;
  --amber:#FFD166;
  --steel:#5C7A99;
  --white:#F4FBFF;

  --line:rgba(34,224,214,.20);
  --line-soft:rgba(34,224,214,.10);
  --line-strong:rgba(34,224,214,.46);
  --panel:rgba(11,39,66,.62);
  --panel-2:rgba(11,39,66,.34);

  --radius-xs:12px;
  --radius-sm:16px;
  --radius-md:22px;
  --radius-lg:30px;
  --radius-pill:999px;

  --shell:1280px;
  --gutter:clamp(16px,4vw,40px);

  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-num:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --ease:cubic-bezier(.22,.7,.3,1);
  --shadow-lift:0 22px 54px rgba(4,16,28,.6);
  --shadow-glow:0 12px 30px rgba(34,224,214,.22);
}

body{
  min-height:100%;
  font-family:var(--font-body);
  font-size:clamp(15px,.35vw + 14px,17px);
  line-height:1.78;
  color:#e2eef8;
  background:
    radial-gradient(1100px 520px at 10% -10%, rgba(34,224,214,.15), transparent 62%),
    radial-gradient(900px 460px at 94% 2%, rgba(255,90,54,.11), transparent 60%),
    var(--ink);
  background-color:var(--ink);
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4{font-family:var(--font-head);font-weight:900;color:var(--white);line-height:1.12;letter-spacing:-.01em}
h1{font-size:clamp(38px,7vw,84px);line-height:1.04}
h2{font-size:clamp(28px,4vw,46px)}
h3{font-size:clamp(21px,2.2vw,28px)}
p{overflow-wrap:break-word}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:8px}

.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.visually-hidden{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

.muted{color:var(--steel)}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-120px;
  z-index:120;
  padding:11px 20px;
  border-radius:var(--radius-pill);
  background:var(--cyan);
  color:#03202a;
  font-family:var(--font-head);
  font-weight:800;
  font-size:14px;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:14px}

/* ---------- 通用按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  border-radius:var(--radius-pill);
  border:1px solid transparent;
  font-family:var(--font-head);
  font-weight:800;
  font-size:14px;
  letter-spacing:.02em;
  cursor:pointer;
  transition:transform .2s var(--ease),background .2s linear,color .2s linear,border-color .2s linear,box-shadow .2s linear;
}
.btn--primary{
  background:linear-gradient(118deg,var(--cyan),#63f2e7);
  color:#03202a;
  box-shadow:var(--shadow-glow);
}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 16px 38px rgba(34,224,214,.32)}
.btn--ghost{
  background:rgba(34,224,214,.06);
  border-color:var(--line-strong);
  color:var(--cyan-soft);
}
.btn--ghost:hover{background:rgba(34,224,214,.14);color:var(--white)}
.btn--flare{
  background:linear-gradient(118deg,var(--flare),#ff8156);
  color:#2b0a02;
  box-shadow:0 12px 30px rgba(255,90,54,.26);
}
.btn--flare:hover{transform:translateY(-2px)}
.btn--sm{padding:8px 15px;font-size:13px}

/* ---------- 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:linear-gradient(180deg,rgba(4,16,28,.98),rgba(6,24,43,.94));
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
}

.header-rail__inner{
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,26px);
  min-height:66px;
  padding-block:8px;
}

.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto}
.brand__mark{
  display:inline-grid;
  place-items:center;
  padding:8px 13px;
  border-radius:var(--radius-pill);
  background:linear-gradient(135deg,var(--cyan),var(--cyan-soft));
  color:#03202a;
  font-family:var(--font-num);
  font-weight:800;
  font-size:15px;
  letter-spacing:.14em;
  box-shadow:0 0 0 1px rgba(34,224,214,.5),var(--shadow-glow);
}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__name{font-family:var(--font-head);font-weight:900;font-size:19px;color:var(--white);letter-spacing:.02em}
.brand__badge{font-family:var(--font-num);font-size:11px;letter-spacing:.16em;color:var(--amber)}

.header-rail__tagline{
  display:none;
  margin:0;
  font-size:13px;
  line-height:1.5;
  color:var(--steel);
  max-width:36ch;
}

.header-rail__actions{
  margin-left:auto;
  display:flex;
  align-items:center;
  gap:10px;
}

.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:10px 15px;
  border-radius:var(--radius-pill);
  border:1px solid var(--line-strong);
  background:rgba(34,224,214,.07);
  color:var(--cyan-soft);
  font-family:var(--font-head);
  font-weight:800;
  font-size:13px;
  cursor:pointer;
  transition:background .2s linear,border-color .2s linear,color .2s linear;
}
.nav-toggle:hover{background:rgba(34,224,214,.14);color:var(--white)}
.nav-toggle__bars{display:grid;gap:3px}
.nav-toggle__bars i{display:block;width:16px;height:2px;border-radius:2px;background:currentColor;transition:transform .22s var(--ease),opacity .22s linear}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.header-nav{
  background:rgba(11,39,66,.55);
  border-top:1px solid var(--line-soft);
}
.header-nav__inner{display:flex;align-items:center}

.site-nav{
  width:100%;
  max-height:0;
  overflow:hidden;
  transition:max-height .34s var(--ease);
}
.site-nav[data-open]{max-height:76vh;overflow-y:auto}

.nav-list{counter-reset:nav-index;display:flex;flex-direction:column;padding-block:4px}

.nav-link{
  display:flex;
  align-items:center;
  gap:10px;
  padding:13px 6px;
  color:var(--cyan-soft);
  font-family:var(--font-head);
  font-weight:800;
  font-size:15px;
  border-bottom:1px solid var(--line-soft);
  transition:color .18s linear,background .18s linear;
}
.nav-link::before{
  counter-increment:nav-index;
  content:counter(nav-index,decimal-leading-zero);
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--steel);
}
.nav-link:hover{color:var(--white)}
.nav-link[aria-current="page"]{color:var(--white)}
.nav-link[aria-current="page"]::before{color:var(--flare)}

.scroll-meter{
  position:absolute;
  left:0;
  bottom:-1px;
  width:100%;
  height:3px;
  transform:scaleX(var(--scroll-progress,0));
  transform-origin:left center;
  background:linear-gradient(90deg,var(--cyan),var(--amber) 58%,var(--flare));
  transition:transform .12s linear;
}

/* ---------- 章节骨架 ---------- */
.section{padding-block:clamp(44px,6vw,88px)}
.section--tight{padding-block:clamp(26px,4vw,52px)}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  gap:18px;
  margin-bottom:clamp(20px,3vw,36px);
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--cyan)}
.section-title{font-size:clamp(28px,4vw,46px);font-weight:900}
.section-lead{max-width:64ch;font-size:15px;line-height:1.78;color:var(--steel)}

.rule{
  position:relative;
  height:1px;
  margin-block:clamp(24px,4vw,46px);
  background:linear-gradient(90deg,var(--line-strong),rgba(34,224,214,.04));
}
.rule::before{
  content:"";
  position:absolute;
  left:0;
  top:-3px;
  width:2px;
  height:7px;
  background:var(--cyan);
}

/* ---------- 卡片与标签 ---------- */
.card{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  border-radius:var(--radius-md);
  border:1px solid var(--line);
  background:var(--panel);
  transition:border-color .2s linear,transform .2s var(--ease),background .2s linear;
}
.card:hover{border-color:var(--line-strong);background:rgba(11,39,66,.78);transform:translateY(-3px)}
.card__title{font-family:var(--font-head);font-weight:800;font-size:clamp(17px,1.6vw,21px);line-height:1.32;color:var(--white)}
.card__meta{font-family:var(--font-num);font-size:12px;letter-spacing:.08em;color:var(--steel)}
.card--accent{border-left:3px solid var(--cyan)}
.card--flare{border-left:3px solid var(--flare)}

.badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 12px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(255,209,102,.32);
  background:rgba(255,209,102,.12);
  color:var(--amber);
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.1em;
}
.badge--flare{border-color:rgba(255,90,54,.36);background:rgba(255,90,54,.14);color:#ff9c81}
.badge--cyan{border-color:var(--line-strong);background:rgba(34,224,214,.1);color:var(--cyan)}

.chip{
  display:inline-flex;
  align-items:center;
  padding:4px 10px;
  border-radius:var(--radius-pill);
  border:1px solid var(--line);
  background:rgba(34,224,214,.06);
  color:var(--cyan-soft);
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.06em;
}

.taglist{display:flex;flex-wrap:wrap;gap:9px}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:8px 15px;
  border-radius:var(--radius-pill);
  border:1px solid var(--line);
  background:rgba(34,224,214,.07);
  color:var(--cyan-soft);
  font-family:var(--font-head);
  font-weight:800;
  font-size:13px;
  cursor:pointer;
  transition:background .18s linear,color .18s linear,border-color .18s linear;
}
.tag:hover{border-color:var(--line-strong);color:var(--white)}
.tag[aria-pressed="true"]{
  background:linear-gradient(118deg,var(--cyan),#63f2e7);
  border-color:transparent;
  color:#03202a;
}

/* ---------- 数据块 ---------- */
.stat{display:flex;flex-direction:column;gap:4px}
.stat__value{
  font-family:var(--font-num);
  font-weight:800;
  font-size:clamp(24px,3vw,38px);
  line-height:1.15;
  color:var(--white);
  letter-spacing:-.01em;
}
.stat__value--cyan{color:var(--cyan)}
.stat__value--flare{color:var(--flare)}
.stat__label{
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--steel);
}

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin-bottom:20px;
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--steel);
}
.breadcrumbs a{color:var(--cyan-soft)}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs__sep{color:rgba(92,122,153,.62)}

/* ---------- 正文排版 ---------- */
.prose{
  max-width:74ch;
  font-size:clamp(15.5px,.4vw + 14px,17.5px);
  line-height:1.85;
  color:#dbe9f4;
}
.prose > * + *{margin-top:1.1em}
.prose h2{font-size:clamp(22px,2.6vw,32px);margin-top:1.8em}
.prose h3{font-size:clamp(19px,2vw,24px);margin-top:1.5em}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px}
.prose ul,.prose ol{list-style:disc;padding-left:1.3em}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.4em}
.prose strong{color:var(--white)}
.prose blockquote{
  padding:14px 20px;
  border-left:3px solid var(--cyan);
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  background:var(--panel-2);
  color:var(--cyan-soft);
}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:clamp(16px,2vw,24px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(270px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.grid--4{grid-template-columns:repeat(auto-fit,minmax(190px,1fr))}

/* ---------- 图片容器（页面阶段放图） ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  isolation:isolate;
  border-radius:var(--radius-lg);
  border:1px solid var(--line);
  background:
    radial-gradient(120% 100% at 8% 0%, rgba(34,224,214,.22), transparent 58%),
    radial-gradient(110% 90% at 100% 100%, rgba(255,90,54,.18), transparent 60%),
    linear-gradient(150deg,rgba(11,39,66,.95),rgba(4,16,28,.95));
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(244,251,255,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(244,251,255,.05) 1px,transparent 1px);
  background-size:38px 38px;
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  position:relative;
  z-index:0;
}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame--21x9{aspect-ratio:21/9}
.media-frame--3x4{aspect-ratio:3/4}
.media-frame__tag{
  position:absolute;
  left:16px;
  bottom:16px;
  z-index:2;
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:6px 13px;
  border-radius:var(--radius-pill);
  background:rgba(4,16,28,.78);
  border:1px solid var(--line-strong);
  color:var(--cyan-soft);
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.1em;
}

/* ---------- 滚动显现 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(22px);
  transition:opacity .62s var(--ease),transform .62s var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,110px);
  background:linear-gradient(180deg,rgba(11,39,66,.72),var(--ink-3));
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:2px;
  background:linear-gradient(90deg,transparent,var(--cyan),var(--amber) 70%,transparent);
  opacity:.7;
}

.footer-top{padding-block:clamp(38px,5vw,72px) clamp(26px,4vw,46px)}

.footer-grid{
  display:grid;
  gap:clamp(24px,3vw,40px);
  grid-template-columns:1fr;
}

.footer-brand__mark{
  display:inline-block;
  font-family:var(--font-head);
  font-weight:900;
  font-size:22px;
  letter-spacing:.02em;
  color:var(--white);
}
.footer-brand__mark:hover{color:var(--cyan)}
.footer-brand__text{
  margin-top:12px;
  max-width:42ch;
  font-size:14px;
  line-height:1.8;
  color:var(--steel);
}
.footer-brand__meta{
  display:flex;
  align-items:center;
  gap:8px;
  margin-top:14px;
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--cyan-soft);
}
.footer-dot{
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--flare);
  box-shadow:0 0 0 4px rgba(255,90,54,.16);
}

.footer-col__title{
  margin-bottom:14px;
  font-family:var(--font-num);
  font-size:12px;
  font-weight:700;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-links{display:grid;gap:9px}
.footer-link{
  display:inline-block;
  font-size:14.5px;
  color:#c9dcea;
  transition:color .18s linear,transform .18s var(--ease);
}
.footer-link::before{content:"—";margin-right:8px;color:var(--steel)}
.footer-link:hover{color:var(--cyan);transform:translateX(3px)}

.contact-lines{display:grid;gap:14px}
.contact-line{display:grid;gap:5px}
.contact-line__label{
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--steel);
}
.contact-line__value{
  font-family:var(--font-num);
  font-size:14px;
  line-height:1.5;
  color:var(--white);
  word-break:break-word;
}
.contact-line__value--plain{font-family:var(--font-body);font-size:14px;color:#c9dcea}

.copy-btn{
  display:inline-block;
  width:fit-content;
  max-width:100%;
  padding:7px 12px;
  border-radius:var(--radius-xs);
  border:1px dashed rgba(34,224,214,.4);
  background:rgba(34,224,214,.08);
  cursor:pointer;
  text-align:left;
  transition:background .18s linear,border-color .18s linear,color .18s linear;
}
.copy-btn:hover{background:rgba(34,224,214,.16);border-color:var(--cyan);color:var(--cyan)}
.copy-btn:active{transform:scale(.99)}

.contact-note{
  margin-top:16px;
  max-width:44ch;
  font-size:13px;
  line-height:1.75;
  color:var(--steel);
}

.footer-bottom{
  border-top:1px solid var(--line-soft);
  background:rgba(4,16,28,.72);
}
.footer-bottom__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding-block:18px;
}
.footer-legal{
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.05em;
  color:var(--steel);
}
.footer-mark{
  font-family:var(--font-head);
  font-weight:800;
  font-size:13px;
  letter-spacing:.1em;
  color:var(--cyan-soft);
}

.toast{
  position:fixed;
  left:var(--gutter);
  bottom:24px;
  z-index:120;
  padding:11px 18px;
  border-radius:var(--radius-pill);
  border:1px solid var(--line-strong);
  background:rgba(4,16,28,.94);
  color:var(--cyan-soft);
  font-family:var(--font-num);
  font-size:13px;
  letter-spacing:.05em;
  opacity:0;
  transform:translateY(12px);
  pointer-events:none;
  transition:opacity .24s linear,transform .24s var(--ease);
}
.toast[data-visible]{opacity:1;transform:none}

/* ---------- 平板 ---------- */
@media (min-width:640px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-bottom__inner{flex-wrap:nowrap}
}

/* ---------- 桌面 ---------- */
@media (min-width:900px){
  .header-rail__inner{min-height:74px}
  .nav-toggle{display:none}

  .site-nav{max-height:none;overflow:visible}
  .nav-list{flex-direction:row;flex-wrap:wrap;gap:4px;padding-block:6px}
  .nav-link{
    position:relative;
    padding:14px 16px;
    border-bottom:0;
    border-radius:var(--radius-pill);
    font-size:15px;
  }
  .nav-link::after{
    content:"";
    position:absolute;
    left:16px;
    right:16px;
    bottom:8px;
    height:2px;
    border-radius:2px;
    background:var(--cyan);
    transform:scaleX(0);
    transform-origin:left center;
    transition:transform .24s var(--ease);
  }
  .nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
  .nav-link[aria-current="page"]{
    background:rgba(34,224,214,.13);
    color:var(--white);
    box-shadow:inset 0 0 0 1px var(--line-strong);
  }
  .nav-link[aria-current="page"]::after{background:var(--flare);transform:scaleX(1)}
}

@media (min-width:1024px){
  .footer-grid{grid-template-columns:1.5fr .85fr .85fr .85fr 1.35fr}
}

@media (min-width:1080px){
  .header-rail__tagline{display:block}
}

@media (max-width:559px){
  .header-rail__actions .btn--primary{display:none}
  .brand__name{font-size:17px}
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  [data-reveal]{opacity:1 !important;transform:none !important}
  .card:hover,.btn:hover,.footer-link:hover{transform:none !important}
  .scroll-meter{transition:none}
}