/* ==========================================================================
   6686体育 · 共享样式表 /assets/site.css
   夜间赛场指挥台 × 复古出版索引
   ========================================================================== */

:root{
  --ink:#071C16;
  --ink-2:#0E2B22;
  --line:#294A3F;
  --cyan:#4DF5D2;
  --signal:#FF6A2A;
  --paper:#F4EFE2;
  --mist:#B8C4BE;
  --gold:#D8A657;
  --white:#FFFFFF;

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

  --page-max:1440px;
  --gutter:clamp(18px,4vw,64px);
  --gap:clamp(16px,2vw,24px);
  --ease:cubic-bezier(.22,.61,.36,1);
  --scroll-progress:0;
}

/* ---------- reset ---------- */
*,
*::before,
*::after{box-sizing:border-box;}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  background:var(--ink);
  overflow-x:clip;
}

html.nav-open{overflow:hidden;}

body{
  margin:0;
  min-height:100vh;
  overflow-x:clip;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:clamp(16px,1.02vw,18px);
  line-height:1.78;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}

img,svg,video{display:block;max-width:100%;height:auto;}

h1,h2,h3,h4,h5{
  margin:0;
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.05;
  letter-spacing:.01em;
  color:var(--white);
}

p{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
button{font:inherit;color:inherit;}
a{color:var(--cyan);text-decoration:none;}
a:hover{color:var(--cyan);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;}
::selection{background:var(--cyan);color:#04241d;}

/* ---------- helpers ---------- */
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.06em;}

.visually-hidden{
  position:absolute;
  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;
}

.container{
  width:100%;
  max-width:var(--page-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.container--narrow{max-width:920px;}

#main-content{display:block;scroll-margin-top:112px;}

/* ---------- layout primitives ---------- */
.section{padding-block:clamp(44px,6vw,96px);}
.section--panel{background:var(--ink-2);border-block:1px solid var(--line);}
.page-header{padding-block:clamp(32px,4.6vw,68px);}

.section-head{display:grid;gap:14px;max-width:72ch;margin-bottom:clamp(22px,3.4vw,42px);}
.section-head h2{font-size:clamp(30px,4.2vw,56px);}

.eyebrow{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--gold);
}

.lede{
  max-width:68ch;
  color:var(--mist);
  font-size:clamp(16px,1.35vw,19px);
  line-height:1.85;
}

.index-rule{
  height:1px;
  border:0;
  margin:0;
  background:linear-gradient(90deg,var(--cyan),var(--line) 42%,transparent);
}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap);}
.col-3{grid-column:span 3;}
.col-4{grid-column:span 4;}
.col-5{grid-column:span 5;}
.col-6{grid-column:span 6;}
.col-7{grid-column:span 7;}
.col-8{grid-column:span 8;}
.col-12{grid-column:span 12;}

@media (max-width:1023px){
  .grid-12{grid-template-columns:repeat(4,minmax(0,1fr));}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-12{grid-column:span 4;}
}

/* ---------- buttons ---------- */
.btn{
  --btn-bg:transparent;
  --btn-fg:var(--paper);
  --btn-bd:var(--line);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  border:1px solid var(--btn-bd);
  border-radius:0;
  background:var(--btn-bg);
  color:var(--btn-fg);
  font-family:var(--font-body);
  font-size:13px;
  letter-spacing:.12em;
  text-decoration:none;
  cursor:pointer;
  transition:background-color 180ms ease,color 180ms ease,border-color 180ms ease;
}
.btn:hover{text-decoration:none;}
.btn--signal{--btn-bg:var(--signal);--btn-fg:#180802;--btn-bd:var(--signal);}
.btn--signal:hover{--btn-bg:#ff8551;--btn-bd:#ff8551;--btn-fg:#180802;}
.btn--cyan{--btn-bg:var(--cyan);--btn-fg:#03211b;--btn-bd:var(--cyan);}
.btn--cyan:hover{--btn-bg:#7ffbe4;--btn-bd:#7ffbe4;--btn-fg:#03211b;}
.btn--ghost{--btn-bg:transparent;--btn-fg:var(--paper);--btn-bd:var(--line);}
.btn--ghost:hover{--btn-bg:rgba(77,245,210,.12);--btn-bd:var(--cyan);--btn-fg:var(--cyan);}

/* ---------- chips ---------- */
.chips{display:flex;flex-wrap:wrap;gap:8px;}
.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:7px 14px;
  border:1px solid var(--line);
  border-radius:999px;
  background:transparent;
  color:var(--mist);
  font-size:12px;
  letter-spacing:.1em;
  cursor:pointer;
  transition:background-color 180ms ease,color 180ms ease,border-color 180ms ease;
}
.chip:hover{border-color:var(--cyan);color:var(--cyan);}
.chip[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:#03211b;}

/* ---------- panels & data ---------- */
.panel{
  background:var(--ink-2);
  border:1px solid var(--line);
  padding:clamp(20px,2.6vw,32px);
}
.panel--paper{background:var(--paper);border-color:#d9d2c0;color:#101a16;}
.panel--paper h2,
.panel--paper h3,
.panel--paper h4{color:#0b1a15;}
.panel--paper .lede{color:#3b4b44;}

.stat-slice{
  display:grid;
  gap:4px;
  padding-left:12px;
  border-left:1px solid var(--cyan);
}
.stat-slice__num{
  font-family:var(--font-mono);
  font-size:clamp(20px,2.4vw,30px);
  line-height:1;
  color:var(--cyan);
  font-variant-numeric:tabular-nums;
}
.stat-slice__label{
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--mist);
}

/* ---------- breadcrumbs ---------- */
.breadcrumbs{padding-block:clamp(14px,2vw,22px);border-bottom:1px solid var(--line);}
.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:8px;font-size:12px;letter-spacing:.1em;}
.breadcrumbs li + li::before{content:"/";margin-right:8px;color:var(--line);}
.breadcrumbs a{color:var(--mist);}
.breadcrumbs a:hover{color:var(--cyan);}
.breadcrumbs [aria-current="page"]{color:var(--paper);}

/* ---------- figure placeholder ---------- */
.figure-frame{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  border:1px solid var(--line);
  background:
    repeating-linear-gradient(90deg,rgba(41,74,63,.55) 0 1px,transparent 1px 56px),
    repeating-linear-gradient(0deg,rgba(41,74,63,.55) 0 1px,transparent 1px 56px),
    radial-gradient(120% 90% at 18% 0%,rgba(77,245,210,.16),transparent 62%),
    var(--ink-2);
}
.figure-frame::after{
  content:"";
  position:absolute;
  inset:auto 0 0 0;
  height:3px;
  background:linear-gradient(90deg,var(--cyan),var(--signal));
  opacity:.6;
  pointer-events:none;
}
.figure-frame--wide{aspect-ratio:16/9;}
.figure-frame--tall{aspect-ratio:3/4;}
.figure-frame--square{aspect-ratio:1/1;}
.figure-frame > img{width:100%;height:100%;object-fit:cover;}
.figure-frame__caption{
  position:absolute;
  left:0;
  bottom:3px;
  padding:9px 14px;
  background:rgba(7,28,22,.84);
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
}

/* ---------- expandable research board ---------- */
.expand-set{display:grid;border-top:1px solid var(--line);}
.expand-item{border-bottom:1px solid var(--line);}
.expand-trigger{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  width:100%;
  padding:18px 0;
  border:0;
  background:none;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:clamp(16px,1.3vw,18px);
  text-align:left;
  cursor:pointer;
  transition:color 180ms ease;
}
.expand-trigger:hover{color:var(--cyan);}
.expand-trigger__mark{
  font-family:var(--font-mono);
  font-size:18px;
  line-height:1;
  color:var(--cyan);
  transition:transform 240ms var(--ease);
}
.expand-trigger[aria-expanded="true"] .expand-trigger__mark{transform:rotate(45deg);}
.expand-panel{padding-bottom:20px;color:var(--mist);}
.expand-panel[hidden]{display:none;}

/* ---------- reveal ---------- */
.will-reveal{
  opacity:0;
  transform:translateY(14px);
  transition:opacity 520ms var(--ease),transform 520ms var(--ease);
}
.will-reveal.is-revealed{opacity:1;transform:none;}

/* ==========================================================================
   Header
   ========================================================================== */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  color:var(--paper);
  background:
    radial-gradient(120% 150% at 10% -30%,rgba(77,245,210,.16),transparent 58%),
    linear-gradient(180deg,var(--ink) 0%,var(--ink) 78%,#061813 100%);
  border-bottom:1px solid var(--line);
}
.site-header[data-scrolled="true"]{
  border-bottom-color:#3c6a58;
  box-shadow:0 20px 44px -30px rgba(0,0,0,.95);
}

.skip-link{
  position:absolute;
  left:16px;
  top:-72px;
  z-index:120;
  padding:10px 18px;
  background:var(--cyan);
  color:#03211b;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  transition:top 180ms var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{top:12px;text-decoration:none;}

.header-progress{
  position:absolute;
  inset:auto 0 0 0;
  height:2px;
  background:rgba(41,74,63,.55);
  pointer-events:none;
}
.header-progress::after{
  content:"";
  display:block;
  height:100%;
  transform:scaleX(var(--scroll-progress,0));
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--cyan) 68%,var(--signal) 100%);
}

.header-bar{
  position:relative;
  display:grid;
  grid-template-columns:minmax(0,auto) minmax(0,1fr) minmax(0,auto);
  align-items:start;
  gap:clamp(16px,2vw,32px);
  width:100%;
  max-width:var(--page-max);
  margin-inline:auto;
  padding:clamp(14px,1.8vw,22px) var(--gutter) clamp(16px,2vw,26px);
}

.brand-block{grid-column:1;display:grid;gap:6px;align-content:start;}
.brand{display:grid;gap:5px;text-decoration:none;}
.brand:hover{text-decoration:none;}
.brand-mark{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.28em;
  color:var(--gold);
}
.brand-name{
  font-family:var(--font-display);
  font-size:clamp(20px,2.1vw,28px);
  font-weight:700;
  line-height:1;
  letter-spacing:.04em;
  color:var(--white);
  transition:color 180ms ease;
}
.brand:hover .brand-name{color:var(--cyan);}
.brand-descriptor{
  font-size:12px;
  letter-spacing:.14em;
  color:var(--mist);
}
.brand-edition{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--cyan);
}

.header-spine{
  grid-column:2;
  display:grid;
  justify-items:center;
  align-content:start;
  gap:8px;
  padding-top:2px;
}
.spine-label{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.42em;
  text-transform:uppercase;
  color:var(--line);
}
.spine-line{
  width:1px;
  height:clamp(18px,2.6vw,34px);
  background:linear-gradient(180deg,var(--cyan),rgba(41,74,63,0));
}

.site-nav{
  grid-column:3;
  justify-self:end;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:flex-end;
  gap:clamp(12px,1.6vw,26px);
}

.nav-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:clamp(12px,1.6vw,24px);
}
.nav-list--lead{gap:clamp(12px,1.6vw,24px);}
.nav-list--trail{gap:clamp(12px,1.6vw,24px);}

.nav-divider{display:none;width:1px;height:18px;background:var(--line);}

.nav-link{
  position:relative;
  display:inline-block;
  padding:6px 0;
  color:var(--paper);
  font-size:14px;
  letter-spacing:.06em;
  text-decoration:none;
  transition:color 180ms ease;
}
.nav-link:hover{color:var(--cyan);text-decoration:none;}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:1px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform 200ms var(--ease);
}
.nav-link:hover::after,
.nav-link:focus-visible::after{transform:scaleX(1);}
.nav-link[aria-current="page"]{color:var(--cyan);}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--signal);}

.nav-utility{display:flex;align-items:center;gap:14px;}
.nav-cta{font-size:12px;letter-spacing:.1em;padding:10px 16px;}
.nav-mail{
  display:none;
  font-size:11px;
  letter-spacing:.04em;
  color:var(--mist);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  border:1px solid var(--line);
  border-radius:0;
  background:rgba(14,43,34,.88);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  cursor:pointer;
  transition:border-color 180ms ease,color 180ms ease,background-color 180ms ease;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan);}
.nav-toggle-label{line-height:1;}
.nav-toggle-glyph{display:grid;gap:4px;width:16px;}
.nav-toggle-glyph span{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform 220ms var(--ease),opacity 220ms ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-glyph span:first-child{transform:translateY(3px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle-glyph span:last-child{transform:translateY(-3px) rotate(-45deg);}

@media (min-width:1280px){
  .nav-mail{display:block;}
}
@media (min-width:1024px){
  .nav-list--trail{
    padding-left:clamp(12px,1.6vw,24px);
    border-left:1px solid var(--line);
  }
}

/* ---------- header: mobile drawer ---------- */
@media (max-width:1023px){
  .header-bar{
    grid-template-columns:minmax(0,1fr) auto;
    align-items:center;
    gap:12px;
  }
  .header-spine{display:none;}
  .nav-toggle{display:inline-flex;}
  .brand-descriptor{font-size:11px;}

  .site-nav{
    position:fixed;
    inset:auto 0 0 0;
    z-index:90;
    display:block;
    width:100%;
    max-height:86vh;
    overflow-y:auto;
    padding:24px var(--gutter) calc(28px + env(safe-area-inset-bottom,0px));
    background:linear-gradient(180deg,#0B241C 0%,var(--ink-2) 100%);
    border-top:2px solid var(--cyan);
    box-shadow:0 -32px 64px -22px rgba(0,0,0,.85);
    transform:translateY(102%);
    visibility:hidden;
    transition:transform 300ms var(--ease),visibility 0s linear 300ms;
  }
  .site-nav[data-open="true"]{
    transform:translateY(0);
    visibility:visible;
    transition:transform 300ms var(--ease),visibility 0s;
  }

  .nav-list{display:grid;gap:0;width:100%;}
  .nav-list li{width:100%;}
  .nav-link{
    display:block;
    width:100%;
    padding:14px 0;
    border-bottom:1px solid var(--line);
    font-size:17px;
    letter-spacing:.04em;
  }
  .nav-link::after{display:none;}
  .nav-list--trail{border-left:0;padding-left:0;}

  .nav-divider{display:block;width:100%;height:1px;margin:16px 0;background:var(--line);}

  .nav-utility{display:grid;gap:14px;margin-top:22px;width:100%;}
  .nav-cta{width:100%;padding-block:14px;font-size:13px;}
  .nav-mail{display:block;font-size:11px;word-break:break-all;color:var(--mist);}
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer{
  margin-top:clamp(40px,6vw,88px);
  background:var(--ink-2);
  border-top:1px solid var(--line);
  color:var(--paper);
}
.footer-band{
  height:6px;
  background:repeating-linear-gradient(90deg,var(--cyan) 0 6px,transparent 6px 20px);
  opacity:.55;
}

.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.6fr) repeat(3,minmax(0,.8fr)) minmax(0,1.35fr);
  gap:clamp(24px,3vw,48px);
  padding-block:clamp(38px,5vw,68px);
}

.footer-brand{display:grid;align-content:start;gap:0;}
.footer-tagline{
  margin-top:14px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-note{
  margin-top:10px;
  max-width:34ch;
  color:var(--mist);
  font-size:14px;
  line-height:1.8;
}

.footer-col__title{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:400;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--gold);
}
.footer-links li + li{margin-top:10px;}
.footer-links a{color:var(--mist);font-size:14px;transition:color 180ms ease;}
.footer-links a:hover{color:var(--cyan);}

.footer-contact__list{display:grid;gap:10px;}
.footer-contact__list li{display:grid;grid-template-columns:44px minmax(0,1fr);gap:10px;align-items:baseline;}
.footer-contact__key{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--gold);
}
.footer-contact__val{font-size:13.5px;color:var(--paper);word-break:break-word;}
.footer-contact__note{margin-top:14px;font-size:12px;line-height:1.7;color:var(--mist);}

.footer-legal{border-top:1px solid var(--line);background:var(--ink);}
.footer-legal__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:14px 24px;
  padding-block:18px;
}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:12px 20px;font-size:12.5px;}
.footer-legal__links a{color:var(--mist);}
.footer-legal__links a:hover{color:var(--cyan);}
.footer-icp{margin:0;margin-left:auto;font-size:12px;color:var(--mist);}
.footer-copy{margin:0;font-size:12px;color:var(--mist);}

.to-top{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 14px;
  border:1px solid var(--line);
  border-radius:0;
  background:transparent;
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  cursor:pointer;
  transition:border-color 180ms ease,color 180ms ease,background-color 180ms ease;
}
.to-top::before{content:"↑";font-size:12px;line-height:1;}
.to-top:hover{border-color:var(--cyan);color:var(--cyan);background:rgba(77,245,210,.08);}

@media (max-width:1180px){
  .footer-grid{grid-template-columns:repeat(3,minmax(0,1fr));}
  .footer-brand,
  .footer-contact{grid-column:span 3;}
}
@media (max-width:720px){
  .footer-grid{grid-template-columns:1fr;}
  .footer-brand,
  .footer-contact{grid-column:auto;}
  .footer-icp{margin-left:0;}
  .footer-legal__inner{gap:12px 18px;}
}

/* ---------- motion preferences ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
  .will-reveal{opacity:1;transform:none;}
  .site-nav{transition:none;}
}