/* ============================================================
   球盟会赛场 — /assets/site.css
   蓝图网格 × 场边数据终端 · 共享层（reset / 变量 / 外壳 / 基础组件）
   ============================================================ */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,ul,ol,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video,picture{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
:where(a,button,[tabindex]):focus-visible{outline:2px solid var(--signal);outline-offset:3px;border-radius:2px}

/* ---------- tokens ---------- */
:root{
  --ink:#061621;
  --ink-deep:#04121B;
  --ink-soft:#0A2230;
  --grass:#1F8A5B;
  --grass-deep:#0D4A36;
  --signal:#FF6A1A;
  --red:#D93A3A;
  --yellow:#F2C94C;
  --glass:#DDF3E6;
  --line:#3A6270;
  --white:#F7FBF8;
  --muted:#A8C8B8;

  --line-soft:rgba(58,98,112,.45);
  --line-faint:rgba(58,98,112,.24);

  --grid:64px;
  --shell:1280px;
  --gutter:clamp(20px,4vw,56px);
  --radius:3px;

  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-display:"Arial Narrow","Helvetica Neue",Impact,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --step-display:clamp(42px,7vw,108px);
  --step-h2:clamp(26px,3vw,44px);
  --step-h3:clamp(19px,1.8vw,24px);
  --step-body:clamp(16px,1.05vw,17px);
  --step-index:12px;

  --ease:cubic-bezier(.2,.7,.3,1);
  --dur:200ms;
}

/* ---------- base ---------- */
body{
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    linear-gradient(to right, rgba(58,98,112,.16) 0 1px, transparent 1px),
    linear-gradient(to bottom, rgba(58,98,112,.16) 0 1px, transparent 1px);
  background-size:var(--grid) var(--grid);
  background-position:center top;
  background-attachment:fixed;
  color:var(--white);
  font-family:var(--font-sans);
  font-size:var(--step-body);
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
::selection{background:var(--grass);color:var(--white)}

/* ---------- utilities ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.06em}
.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}
.rule{height:1px;width:100%;border:0;background:var(--line-soft)}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:var(--step-index);letter-spacing:.18em;
  text-transform:uppercase;color:var(--muted);
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--signal);flex:0 0 auto}

.t-display{font-family:var(--font-display);font-weight:800;font-size:var(--step-display);line-height:.92;letter-spacing:-.02em}
.t-section{font-family:var(--font-display);font-weight:800;font-size:var(--step-h2);line-height:1.06;letter-spacing:-.01em}
.t-sub{font-family:var(--font-display);font-weight:800;font-size:var(--step-h3);line-height:1.2;letter-spacing:.01em}
.t-lead{font-size:clamp(17px,1.4vw,20px);line-height:1.7;color:rgba(247,251,248,.82);max-width:34em}
.num-xl{display:block;font-family:var(--font-mono);font-weight:700;font-variant-numeric:tabular-nums;font-size:clamp(34px,4.6vw,68px);line-height:.95;letter-spacing:-.02em;color:var(--white)}
.num-xl--signal{color:var(--signal)}

/* ---------- buttons ---------- */
.btn{
  --btn-bg:var(--grass);
  --btn-fg:var(--white);
  --btn-bd:transparent;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:10px 20px;
  background-color:var(--btn-bg);color:var(--btn-fg);
  border:1px solid var(--btn-bd);border-radius:var(--radius);
  font-size:15px;font-weight:600;letter-spacing:.02em;line-height:1.2;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--signal{--btn-bg:var(--signal);--btn-fg:#160800}
.btn--signal:hover{--btn-bg:#ff8340}
.btn--ghost{--btn-bg:transparent;--btn-fg:var(--white);--btn-bd:rgba(58,98,112,.85)}
.btn--ghost:hover{--btn-bg:rgba(31,138,91,.18);--btn-bd:var(--grass)}
.btn--sm{min-height:38px;padding:7px 14px;font-size:13.5px}

/* ---------- breadcrumbs ---------- */
.breadcrumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted)}
.breadcrumbs__link{padding-bottom:1px;border-bottom:1px solid transparent;transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease)}
.breadcrumbs__link:hover{color:var(--white);border-bottom-color:var(--signal)}
.breadcrumbs__sep{color:rgba(58,98,112,.95)}
.breadcrumbs__current{color:var(--glass)}

/* ---------- layout ---------- */
.section{padding-block:clamp(48px,6vw,96px)}
.section--tight{padding-block:clamp(28px,3vw,48px)}
.section__head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:clamp(20px,2.4vw,36px)}
.grid{display:grid;gap:clamp(16px,2vw,28px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.split{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,4fr);gap:clamp(20px,3vw,48px);align-items:start}
.split--rev{grid-template-columns:minmax(0,4fr) minmax(0,7fr)}
.stack{display:flex;flex-direction:column;gap:clamp(12px,1.6vw,20px)}
.stack--lg{gap:clamp(20px,2.6vw,36px)}

/* ---------- surfaces ---------- */
.glass-panel{
  position:relative;
  padding:clamp(18px,2vw,28px);
  background-image:linear-gradient(160deg,rgba(221,243,230,.16),rgba(221,243,230,.05));
  background-color:rgba(6,22,33,.35);
  border:1px solid rgba(221,243,230,.22);
  border-radius:var(--radius);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  color:var(--white);
}

.media-frame{
  position:relative;overflow:hidden;
  aspect-ratio:4/3;width:100%;
  border:1px solid var(--line-faint);border-radius:var(--radius);
  background-color:var(--ink-soft);
  background-image:linear-gradient(135deg,rgba(31,138,91,.34),rgba(6,22,33,.92) 62%);
}
.media-frame::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:40%;
  background-image:linear-gradient(to top,rgba(6,22,33,.88),rgba(6,22,33,0));
  pointer-events:none;
}
.media-frame__img{width:100%;height:100%;object-fit:cover;filter:saturate(1.05) contrast(1.03)}
.media-frame__caption{position:absolute;left:14px;bottom:12px;z-index:2;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--glass)}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--slice{aspect-ratio:21/9}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;border-radius:2px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;
  background-color:rgba(31,138,91,.22);color:var(--glass);
  border:1px solid rgba(31,138,91,.5);
}
.tag--signal{background-color:rgba(255,106,26,.18);color:#FFD3B8;border-color:rgba(255,106,26,.55)}
.tag--red{background-color:rgba(217,58,58,.22);color:#FFD6D6;border-color:rgba(217,58,58,.6)}
.tag--yellow{background-color:rgba(242,201,76,.2);color:#FBEBB5;border-color:rgba(242,201,76,.6)}

/* ---------- reveal (JS 增强，无 JS 时完全可见) ---------- */
html.js [data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
html.js [data-reveal].is-visible{opacity:1;transform:none}

/* ============================================================
   HEADER
   ============================================================ */
.skip-link{
  position:fixed;top:8px;left:8px;z-index:999;
  padding:10px 16px;border-radius:2px;
  background-color:var(--signal);color:#160800;
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.04em;
  transform:translateY(-180%);
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

.site-header{
  position:sticky;top:0;z-index:120;
  background-color:transparent;
  border-bottom:1px solid transparent;
  transition:background-color var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.site-header.is-scrolled,
.site-header[data-open="true"]{
  background-color:rgba(6,22,33,.95);
  border-bottom-color:var(--line-soft);
  box-shadow:0 14px 30px -22px rgba(0,0,0,.95);
  -webkit-backdrop-filter:blur(10px) saturate(140%);
  backdrop-filter:blur(10px) saturate(140%);
}

.header-rail{background-color:rgba(6,22,33,.55);border-bottom:1px solid var(--line-faint);transition:background-color var(--dur) var(--ease),border-color var(--dur) var(--ease)}
.site-header.is-scrolled .header-rail{background-color:transparent;border-bottom-color:transparent}
.header-rail__inner{display:flex;align-items:center;gap:14px;height:34px;overflow:hidden}
.rail-item{font-size:11.5px;letter-spacing:.12em;color:var(--muted);white-space:nowrap}
.rail-item--signal{color:var(--signal)}
.rail-item--wide{color:rgba(168,200,184,.85)}
.rail-line{flex:0 0 22px;height:1px;background-color:var(--line-soft)}
.rail-line--grow{flex:1 1 auto;background-color:var(--line-faint)}

.header-bar{position:relative;display:flex;align-items:center;gap:clamp(12px,2vw,28px);padding-block:12px}

.brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto}
.brand__num{
  display:grid;place-items:center;width:40px;height:40px;
  border:1px solid rgba(31,138,91,.65);border-radius:2px;
  background-image:linear-gradient(150deg,rgba(31,138,91,.38),rgba(31,138,91,.08));
  color:var(--white);font-size:13.5px;font-weight:700;letter-spacing:.06em;
}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__name{font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:.05em}
.brand__meta{font-size:10.5px;letter-spacing:.16em;color:var(--muted);text-transform:uppercase}

.site-nav{display:flex;flex:1 1 auto;justify-content:flex-end}
.site-nav__list{display:flex;align-items:center;gap:2px}
.site-nav__item{display:flex}
.site-nav__link{
  position:relative;display:inline-block;padding:9px 12px;border-radius:2px;
  font-size:14.5px;letter-spacing:.03em;color:rgba(247,251,248,.72);
  transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;
  background-color:var(--signal);
  transform:scaleX(0);transform-origin:left center;
  transition:transform var(--dur) var(--ease);
}
.site-nav__link:hover{color:var(--white);background-color:rgba(31,138,91,.16)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--white);background-color:rgba(31,138,91,.2)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}

.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.header-cta{white-space:nowrap}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  min-height:44px;padding:9px 12px;
  border:1px solid rgba(58,98,112,.75);border-radius:2px;
  background-color:rgba(221,243,230,.06);
  color:var(--white);font-size:13px;letter-spacing:.08em;
  transition:background-color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.nav-toggle:hover{background-color:rgba(31,138,91,.24);border-color:var(--grass)}
.nav-toggle__label{font-size:13px}
.nav-toggle__bars{display:flex;flex-direction:column;justify-content:center;gap:4px;width:16px;height:14px}
.nav-toggle__bar{display:block;height:2px;background-color:currentColor;transition:transform var(--dur) var(--ease)}
.site-header[data-open="true"] .nav-toggle__bar:first-child{transform:translateY(3px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bar:last-child{transform:translateY(-3px) rotate(-45deg)}

.read-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;overflow:hidden;background-color:rgba(58,98,112,.25)}
.read-progress__bar{
  display:block;height:100%;width:100%;
  background-image:linear-gradient(90deg,var(--grass),var(--signal));
  transform:scaleX(var(--progress,0));transform-origin:left center;
  transition:transform .1s linear;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer{
  position:relative;
  margin-top:clamp(48px,6vw,96px);
  background-color:var(--ink-deep);
  background-image:linear-gradient(180deg,rgba(13,74,54,.35),rgba(4,18,27,0) 46%);
  border-top:1px solid var(--line-soft);
  color:var(--white);
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:2px;
  background-image:linear-gradient(90deg,var(--grass) 0%,var(--signal) 42%,rgba(255,106,26,0) 88%);
}

.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) minmax(0,1fr) minmax(0,1fr) minmax(0,1.4fr);
  gap:clamp(24px,3vw,52px);
  padding-block:clamp(40px,5vw,72px) clamp(28px,3vw,44px);
}
.footer-brand__name{font-family:var(--font-display);font-weight:800;font-size:24px;letter-spacing:.06em;line-height:1.1}
.footer-brand__tag{margin-top:12px;max-width:22em;font-size:14.5px;line-height:1.7;color:rgba(247,251,248,.74)}
.footer-brand__note{
  display:inline-block;margin-top:18px;padding:4px 10px;
  border:1px solid rgba(31,138,91,.55);border-radius:2px;
  background-color:rgba(31,138,91,.16);color:var(--glass);
  font-size:11px;letter-spacing:.16em;
}

.footer-col__title{
  margin-bottom:16px;padding-bottom:8px;
  border-bottom:1px solid var(--line-faint);
  font-family:var(--font-mono);font-size:11px;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;color:var(--muted);
}
.footer-list{display:grid;gap:9px}
.footer-link{
  display:inline-block;padding-bottom:1px;
  font-size:14px;color:rgba(247,251,248,.72);
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-link:hover{color:var(--white);border-bottom-color:var(--grass)}
.footer-link--strong{font-size:14.5px;color:var(--glass);word-break:break-all}

.footer-contact__item{display:grid;gap:3px}
.footer-contact__label{font-size:10.5px;letter-spacing:.18em;color:var(--muted)}
.footer-contact__value{font-size:14px;line-height:1.6;color:rgba(247,251,248,.86)}
.footer-contact__note{margin-top:16px;max-width:26em;font-size:12.5px;line-height:1.7;color:var(--muted)}

.footer-bottom{border-top:1px solid var(--line-faint);background-color:rgba(4,18,27,.68)}
.footer-bottom__inner{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;padding-block:18px}
.footer-legal{font-size:12px;letter-spacing:.02em;color:var(--muted)}
.footer-legal-links{display:flex;flex-wrap:wrap;gap:18px}
.footer-legal-link{font-size:12px;color:var(--muted);transition:color var(--dur) var(--ease)}
.footer-legal-link:hover{color:var(--white)}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width:1080px){
  .brand__meta{display:none}
}

@media (max-width:980px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;flex-direction:column;justify-content:flex-start;
    padding:10px var(--gutter) 22px;
    background-color:rgba(6,22,33,.97);
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
    border-bottom:1px solid var(--line-soft);
    box-shadow:0 26px 44px -30px #000;
    max-height:calc(100vh - 96px);overflow-y:auto;
  }
  .site-header[data-open="true"] .site-nav{display:flex}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;width:100%}
  .site-nav__link{display:block;padding:15px 4px;font-size:16px;border-bottom:1px solid var(--line-faint);border-radius:0}
  .site-nav__link::after{left:4px;right:auto;width:24px;bottom:0}
  .site-nav__link:hover{background-color:transparent}
  .site-nav__link[aria-current="page"]{background-color:rgba(31,138,91,.14)}

  .split,.split--rev{grid-template-columns:minmax(0,1fr)}
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}

  .footer-top{grid-template-columns:minmax(0,1.4fr) minmax(0,1fr) minmax(0,1fr)}
  .footer-contact{grid-column:1 / -1}
}

@media (max-width:760px){
  :root{--grid:40px}
  body{background-attachment:scroll}
  .rail-item--wide{display:none}
  .header-rail__inner{height:30px;gap:10px}
  .header-bar{padding-block:10px;gap:10px}
}

@media (max-width:600px){
  .brand__num{width:34px;height:34px;font-size:12px}
  .brand__name{font-size:17px;letter-spacing:.03em}
  .header-cta{padding:8px 12px;font-size:12.5px;min-height:40px}
  .nav-toggle{padding:8px 10px;gap:7px}
  .nav-toggle__label{font-size:12.5px}

  .footer-top{grid-template-columns:1fr 1fr;gap:24px}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1}
  .footer-bottom__inner{justify-content:flex-start}
}

@media (max-width:420px){
  .footer-top{grid-template-columns:1fr}
  .footer-legal-links{gap:14px}
}

/* ============================================================
   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;
  }
  html.js [data-reveal]{opacity:1;transform:none}
  .btn:hover{transform:none}
}