/* ============================================================
   BET赛场 · shared site kit  (/assets/site.css)
   深墨绿数据舱 + 荧光青 + 电光橙 + 奶油纸面
   ============================================================ */

/* ---------- 1. Tokens ---------- */
:root{
  --bc-ink:#0A1F1A;
  --bc-panel:#102A23;
  --bc-mid:#1E4A40;
  --bc-cream:#F3EBDD;
  --bc-paper-ink:#201812;
  --bc-mint:#4FF0D0;
  --bc-orange:#FF6A2B;
  --bc-gray:#8A9690;
  --bc-line:#D7DCD8;
  --bc-yellow:#F5C542;
  --bc-font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --bc-font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --bc-font-mono:"IBM Plex Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --bc-shell-max:1240px;
  --bc-cut:18px;
  --bc-ease:cubic-bezier(.22,.7,.24,1);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg,video{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}
table{border-collapse:collapse;font:inherit;}
hr{border:0;}

/* ---------- 3. Base ---------- */
body{
  background:var(--bc-ink);
  color:var(--bc-cream);
  font-family:var(--bc-font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{
  font-family:var(--bc-font-display);
  font-weight:800;
  line-height:1.08;
  letter-spacing:-.015em;
}
h1{font-size:clamp(30px,4.6vw,56px);}
h2{font-size:clamp(24px,3vw,38px);}
h3{font-size:clamp(19px,1.8vw,24px);}
p{max-width:66ch;}
strong{font-weight:800;color:var(--bc-mint);}
::selection{background:var(--bc-orange);color:#180b04;}
:focus-visible{outline:2px solid var(--bc-mint);outline-offset:3px;}

/* ---------- 4. Shell ---------- */
.bc-shell{
  width:100%;
  max-width:var(--bc-shell-max);
  margin-inline:auto;
  padding-inline:clamp(18px,4vw,40px);
}

/* ---------- 5. Utility atoms ---------- */
.bc-mono{
  font-family:var(--bc-font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.04em;
}
.bc-eyebrow{
  font-family:var(--bc-font-mono);
  font-size:11.5px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--bc-mint);
}
.bc-tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;
  font-family:var(--bc-font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--bc-cream);background:var(--bc-mid);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 7px),calc(100% - 7px) 100%,0 100%);
}
.bc-rule{
  width:100%;height:1px;
  background:linear-gradient(90deg,var(--bc-orange) 0 64px,rgba(79,240,208,.24) 64px 100%);
}
.bc-on-paper{
  background:var(--bc-cream);
  color:var(--bc-paper-ink);
  background-image:radial-gradient(rgba(32,24,18,.05) 1px,transparent 1px);
  background-size:4px 4px;
}

/* ---------- 6. Buttons ---------- */
.bc-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 22px;
  font-family:var(--bc-font-body);font-weight:700;font-size:14px;letter-spacing:.02em;
  border:1px solid transparent;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 11px),calc(100% - 11px) 100%,0 100%);
  transition:background-color .2s var(--bc-ease),color .2s var(--bc-ease),border-color .2s var(--bc-ease),transform .2s var(--bc-ease);
}
.bc-btn--solid{background:var(--bc-orange);color:#180b04;}
.bc-btn--solid:hover{background:var(--bc-mint);color:var(--bc-ink);transform:translateY(-2px);}
.bc-btn--ghost{background:transparent;border-color:rgba(79,240,208,.5);color:var(--bc-mint);}
.bc-btn--ghost:hover{background:rgba(79,240,208,.12);border-color:var(--bc-mint);color:var(--bc-cream);}
.bc-btn--paper{background:var(--bc-paper-ink);color:var(--bc-cream);}
.bc-btn--paper:hover{background:var(--bc-mid);color:var(--bc-mint);}

/* ---------- 7. Header ---------- */
.bc-header{
  position:sticky;top:0;z-index:60;
  background:var(--bc-ink);
  border-bottom:1px solid rgba(79,240,208,.2);
  isolation:isolate;
}
.bc-skip{
  position:absolute;left:12px;top:-72px;z-index:120;
  padding:10px 16px;
  background:var(--bc-mint);color:var(--bc-ink);
  font-weight:800;font-size:13px;
  transition:top .2s var(--bc-ease);
}
.bc-skip:focus-visible{top:12px;}

.bc-rail{
  background:var(--bc-mid);
  background-image:repeating-linear-gradient(90deg,rgba(79,240,208,.09) 0 1px,transparent 1px 26px);
  color:var(--bc-cream);
  border-bottom:1px solid rgba(79,240,208,.16);
}
.bc-rail-inner{
  display:flex;align-items:center;gap:12px;flex-wrap:wrap;
  min-height:36px;padding-block:6px;
}
.bc-rail-dot{
  width:7px;height:7px;flex:none;border-radius:50%;
  background:var(--bc-mint);
  box-shadow:0 0 0 3px rgba(79,240,208,.18);
  animation:bc-pulse 2.6s var(--bc-ease) infinite;
}
@keyframes bc-pulse{
  0%,100%{opacity:1;}
  50%{opacity:.35;}
}
.bc-rail-text{
  font-family:var(--bc-font-mono);font-size:11.5px;letter-spacing:.16em;
  text-transform:uppercase;max-width:none;
}
.bc-rail-meta{
  margin-left:auto;
  font-family:var(--bc-font-mono);font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;color:rgba(243,235,221,.62);max-width:none;
}

.bc-bar{
  position:relative;
  display:flex;align-items:center;gap:20px;
  padding-block:14px 16px;
}
.bc-brand{display:flex;flex-direction:column;gap:3px;flex:none;}
.bc-brand-mark{
  display:inline-flex;align-items:baseline;gap:.22em;
  font-family:var(--bc-font-display);font-weight:800;
  font-size:clamp(22px,2.6vw,30px);line-height:1;letter-spacing:-.02em;
  color:var(--bc-cream);
}
.bc-brand-accent{position:relative;color:var(--bc-mint);}
.bc-brand-accent::after{
  content:"";position:absolute;left:0;right:0;bottom:-3px;height:3px;
  background:var(--bc-orange);
}
.bc-brand-tag{
  font-family:var(--bc-font-mono);font-size:10px;letter-spacing:.2em;
  color:var(--bc-gray);
}

.bc-toggle{
  display:none;align-items:center;gap:10px;margin-left:auto;
  padding:10px 14px;
  border:1px solid rgba(79,240,208,.42);
  color:var(--bc-cream);
  font-family:var(--bc-font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;
  transition:border-color .2s var(--bc-ease),color .2s var(--bc-ease);
}
.bc-toggle:hover{border-color:var(--bc-mint);color:var(--bc-mint);}
.bc-toggle-bars{display:grid;gap:4px;width:18px;}
.bc-toggle-bars span{display:block;height:2px;background:var(--bc-mint);transition:transform .22s var(--bc-ease),opacity .18s linear;}
.bc-toggle-text{white-space:nowrap;}

.bc-nav{display:flex;align-items:center;gap:0;margin-left:auto;}
.bc-nav-link{
  position:relative;
  padding:10px 12px;
  font-size:13.5px;font-weight:600;letter-spacing:.01em;
  color:#c3d0ca;white-space:nowrap;
  transition:color .18s var(--bc-ease);
}
.bc-nav-link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:3px;height:2px;
  background:var(--bc-mint);transform:scaleX(0);transform-origin:left;
  transition:transform .24s var(--bc-ease),background-color .18s linear;
}
.bc-nav-link:hover,.bc-nav-link:focus-visible{color:var(--bc-cream);}
.bc-nav-link:hover::after,.bc-nav-link:focus-visible::after{transform:scaleX(1);}
.bc-nav-link[aria-current="page"]{color:var(--bc-mint);}
.bc-nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--bc-orange);height:3px;}

.bc-cta{
  margin-left:14px;
  display:inline-flex;align-items:center;justify-content:center;
  padding:11px 18px;
  background:var(--bc-orange);color:#180b04;
  font-size:13.5px;font-weight:800;letter-spacing:.02em;white-space:nowrap;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
  transition:background-color .2s var(--bc-ease),color .2s var(--bc-ease);
}
.bc-cta:hover,.bc-cta:focus-visible{background:var(--bc-mint);color:var(--bc-ink);}

.bc-progress{
  position:absolute;left:0;bottom:-1px;z-index:2;
  height:3px;width:0;
  background:linear-gradient(90deg,var(--bc-orange),var(--bc-mint));
  transition:width .08s linear;
}

/* ---------- 8. Footer ---------- */
.bc-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(40px,7vw,88px);
  background:var(--bc-ink);
  color:var(--bc-cream);
  border-top:1px solid rgba(79,240,208,.22);
}
.bc-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    repeating-linear-gradient(90deg,rgba(79,240,208,.07) 0 1px,transparent 1px 48px),
    repeating-linear-gradient(0deg,rgba(79,240,208,.05) 0 1px,transparent 1px 48px);
  mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 72%);
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 72%);
}
.bc-footer::after{
  content:"";position:absolute;right:-8%;top:-40px;width:46%;height:3px;
  background:var(--bc-orange);transform:rotate(-11deg);transform-origin:right center;
  pointer-events:none;opacity:.85;
}
.bc-footer .bc-shell{position:relative;z-index:1;}

.bc-foot-top{
  display:grid;
  grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);
  gap:clamp(24px,4vw,64px);
  padding-block:clamp(40px,6vw,68px) clamp(26px,4vw,42px);
  border-bottom:1px solid rgba(79,240,208,.16);
}
.bc-foot-brand{display:flex;flex-direction:column;gap:16px;align-items:flex-start;}
.bc-brand--foot{display:inline-flex;flex-direction:column;gap:6px;flex:none;}
.bc-brand--foot .bc-brand-mark{font-size:clamp(24px,3vw,34px);}
.bc-foot-note{
  font-size:15px;line-height:1.75;color:#bccac3;max-width:34ch;
}
.bc-foot-entries{display:grid;gap:0;align-content:start;}
.bc-foot-entry{
  display:flex;align-items:baseline;gap:16px;
  padding:14px 4px;
  border-bottom:1px solid rgba(215,220,216,.16);
  font-family:var(--bc-font-display);font-weight:800;
  font-size:clamp(19px,2.3vw,27px);line-height:1.2;letter-spacing:-.01em;
  color:var(--bc-cream);
  transition:color .2s var(--bc-ease),padding-left .2s var(--bc-ease);
}
.bc-foot-entry:first-child{border-top:1px solid rgba(215,220,216,.16);}
.bc-foot-entry:hover,.bc-foot-entry:focus-visible{color:var(--bc-mint);padding-left:14px;}
.bc-foot-idx{
  font-family:var(--bc-font-mono);font-size:12px;font-weight:500;
  letter-spacing:.12em;color:var(--bc-orange);
}

.bc-foot-mid{
  display:grid;
  grid-template-columns:minmax(0,.82fr) minmax(0,1.18fr);
  gap:clamp(22px,3.5vw,56px);
  padding-block:clamp(24px,3.4vw,36px);
  border-bottom:1px solid rgba(79,240,208,.16);
}
.bc-foot-links{
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));
  gap:10px 22px;align-content:start;
}
.bc-foot-link{
  position:relative;display:inline-block;
  font-size:14.5px;color:#c3d0ca;
  padding-block:2px;
  transition:color .18s var(--bc-ease);
}
.bc-foot-link::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:0;
  background:var(--bc-mint);transition:width .24s var(--bc-ease);
}
.bc-foot-link:hover,.bc-foot-link:focus-visible{color:var(--bc-cream);}
.bc-foot-link:hover::after,.bc-foot-link:focus-visible::after{width:100%;}

.bc-foot-contact{display:grid;gap:8px;}
.bc-foot-contact-line{
  display:flex;flex-wrap:wrap;gap:10px;
  font-size:14px;color:#c3d0ca;max-width:none;
}
.bc-foot-label{
  font-family:var(--bc-font-mono);font-size:11px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--bc-gray);
  min-width:62px;padding-top:2px;
}
.bc-foot-service{
  margin-top:4px;font-size:12.5px;line-height:1.7;color:var(--bc-gray);max-width:44ch;
}

.bc-foot-v3{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px;
  padding-block:18px;
  border-bottom:1px solid rgba(79,240,208,.16);
}
.bc-foot-v3-label{
  font-family:var(--bc-font-mono);font-size:11px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--bc-orange);max-width:none;
}
.bc-foot-chips{display:flex;flex-wrap:wrap;gap:8px;}
.bc-chip{
  display:inline-flex;align-items:center;gap:7px;
  padding:6px 12px;
  font-size:12.5px;color:var(--bc-cream);
  background:rgba(30,74,64,.7);
  border:1px solid rgba(79,240,208,.22);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%);
}
.bc-chip::before{
  content:"";width:6px;height:6px;flex:none;border-radius:50%;
  background:var(--bc-yellow);
}
.bc-foot-v3-link{
  margin-left:auto;
  font-family:var(--bc-font-mono);font-size:11.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--bc-mint);
  border-bottom:1px solid rgba(79,240,208,.45);
  padding-bottom:2px;
  transition:color .18s var(--bc-ease),border-color .18s var(--bc-ease);
}
.bc-foot-v3-link:hover,.bc-foot-v3-link:focus-visible{color:var(--bc-orange);border-color:var(--bc-orange);}

.bc-foot-base{
  display:flex;flex-wrap:wrap;gap:8px 26px;
  padding-block:18px 22px;
  font-family:var(--bc-font-mono);font-size:11.5px;letter-spacing:.06em;
  color:var(--bc-gray);
}
.bc-foot-base p{max-width:none;}

/* ---------- 9. Breadcrumbs ---------- */
.bc-crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding-block:18px 0;
  font-family:var(--bc-font-mono);font-size:11.5px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--bc-gray);
}
.bc-crumbs li{display:inline-flex;align-items:center;gap:8px;}
.bc-crumbs li + li::before{content:"/";color:rgba(138,150,144,.55);}
.bc-crumbs a{transition:color .18s var(--bc-ease);}
.bc-crumbs a:hover,.bc-crumbs a:focus-visible{color:var(--bc-mint);}
.bc-crumbs [aria-current="page"]{color:var(--bc-cream);}

/* ---------- 10. Prose ---------- */
.bc-prose{
  max-width:66ch;
  font-size:clamp(15.5px,.35vw + 15px,17.5px);
  line-height:1.8;
  color:var(--bc-cream);
}
.bc-prose > * + *{margin-top:1.05em;}
.bc-prose h2,.bc-prose h3{margin-top:1.8em;color:inherit;}
.bc-prose a{color:var(--bc-mint);border-bottom:1px solid rgba(79,240,208,.4);}
.bc-prose a:hover{border-color:var(--bc-mint);}
.bc-prose ul,.bc-prose ol{padding-left:1.2em;list-style:disc;}
.bc-prose ol{list-style:decimal;}
.bc-prose li + li{margin-top:.4em;}
.bc-prose--paper{color:var(--bc-paper-ink);}
.bc-prose--paper strong{color:var(--bc-paper-ink);}
.bc-prose--paper a{color:var(--bc-mid);border-color:rgba(30,74,64,.4);}

/* ---------- 11. Grid ---------- */
.bc-grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2vw,28px);
}
.bc-span-3{grid-column:span 3;}
.bc-span-4{grid-column:span 4;}
.bc-span-5{grid-column:span 5;}
.bc-span-6{grid-column:span 6;}
.bc-span-7{grid-column:span 7;}
.bc-span-8{grid-column:span 8;}
.bc-span-12{grid-column:span 12;}

/* ---------- 12. Card ---------- */
.bc-card{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  background:var(--bc-panel);
  border:1px solid rgba(79,240,208,.18);
  clip-path:polygon(0 0,100% 0,100% calc(100% - var(--bc-cut)),calc(100% - var(--bc-cut)) 100%,0 100%);
  transition:border-color .22s var(--bc-ease),transform .22s var(--bc-ease);
}
.bc-card:hover{border-color:rgba(255,106,43,.75);transform:translateY(-3px);}
.bc-card h3 + p{margin-top:.6em;}

/* ---------- 13. Media frames (图片容器基础规则) ---------- */
.bc-media{
  position:relative;overflow:hidden;
  aspect-ratio:16 / 9;
  background:linear-gradient(155deg,var(--bc-mid) 0%,var(--bc-ink) 78%);
  border:1px solid rgba(79,240,208,.2);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 22px),calc(100% - 22px) 100%,0 100%);
}
.bc-media > img,.bc-media > svg{width:100%;height:100%;object-fit:cover;}
.bc-media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    repeating-linear-gradient(0deg,rgba(10,31,26,.35) 0 1px,transparent 1px 4px),
    radial-gradient(120% 90% at 78% 12%,rgba(79,240,208,.18),transparent 62%);
}
.bc-media--wide{aspect-ratio:21 / 9;}
.bc-media--tall{aspect-ratio:4 / 5;}
.bc-media--plain{clip-path:none;}
.bc-media-cap{
  margin-top:10px;
  font-family:var(--bc-font-mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--bc-gray);max-width:48ch;
}

/* ---------- 14. Chapter ---------- */
.bc-chapter{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap;}
.bc-chapter-num{
  font-family:var(--bc-font-mono);font-weight:700;
  font-size:clamp(48px,7vw,96px);line-height:.78;letter-spacing:-.04em;
  color:rgba(79,240,208,.16);
  -webkit-text-stroke:1px rgba(79,240,208,.55);
}
.bc-chapter-label{
  font-family:var(--bc-font-mono);font-size:12px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--bc-gray);
}

/* ---------- 15. Reveal ---------- */
html[data-js="on"] [data-reveal]{
  opacity:0;transform:translateY(14px);
}
html[data-js="on"] [data-reveal].is-in{
  opacity:1;transform:none;
  transition:opacity .5s var(--bc-ease),transform .5s var(--bc-ease);
}

/* ---------- 16. Responsive ---------- */
@media (max-width:1080px){
  .bc-nav-link{padding-inline:9px;font-size:13px;}
  .bc-cta{margin-left:10px;padding-inline:14px;}
}
@media (max-width:980px){
  .bc-bar{padding-block:12px;gap:12px;}
  .bc-toggle{display:inline-flex;}
  .bc-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;flex-direction:column;align-items:stretch;gap:0;
    margin-left:0;
    padding:6px 0 18px;
    background:var(--bc-panel);
    border-top:1px solid rgba(79,240,208,.24);
    border-bottom:1px solid rgba(79,240,208,.24);
    box-shadow:0 22px 40px rgba(0,0,0,.42);
    z-index:3;
  }
  .bc-header[data-open] .bc-nav,
  .bc-nav[data-open]{display:flex;}
  .bc-nav-link{
    padding:14px 24px;
    font-size:15px;
    border-bottom:1px solid rgba(79,240,208,.1);
  }
  .bc-nav-link::after{display:none;}
  .bc-nav-link[aria-current="page"]{
    color:var(--bc-mint);
    background:rgba(79,240,208,.09);
    box-shadow:inset 3px 0 0 var(--bc-orange);
  }
  .bc-cta{
    margin:16px 24px 0;
    padding:13px 20px;
    font-size:14px;
  }
  .bc-header[data-open] .bc-toggle-bars span:nth-child(1){transform:translateY(6px) rotate(45deg);}
  .bc-header[data-open] .bc-toggle-bars span:nth-child(2){opacity:0;}
  .bc-header[data-open] .bc-toggle-bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

  .bc-foot-top,
  .bc-foot-mid{grid-template-columns:1fr;}
  .bc-foot-v3-link{margin-left:0;}
}
@media (max-width:960px){
  .bc-span-3,.bc-span-4,.bc-span-5{grid-column:span 6;}
  .bc-span-7,.bc-span-8{grid-column:span 12;}
}
@media (max-width:640px){
  .bc-rail-meta{display:none;}
  .bc-rail-text{font-size:10.5px;letter-spacing:.1em;}
  .bc-grid{grid-template-columns:repeat(4,minmax(0,1fr));}
  .bc-span-3,.bc-span-4,.bc-span-5,.bc-span-6,.bc-span-7,.bc-span-8{grid-column:span 4;}
  .bc-foot-links{grid-template-columns:1fr;}
  .bc-foot-base{flex-direction:column;gap:6px;}
  .bc-chip{font-size:12px;padding:5px 10px;}
  .bc-media,.bc-media--wide{clip-path:polygon(0 0,100% 0,100% calc(100% - 16px),calc(100% - 16px) 100%,0 100%);}
}

/* ---------- 17. Reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  html[data-js="on"] [data-reveal]{
    opacity:1 !important;transform:none !important;
  }
  .bc-card:hover,.bc-btn:hover,.bc-foot-entry:hover{transform:none;}
}