/* ============================================================
   必一体育 · /assets/site.css
   夜场球场灯光 · 左右分屏 · 编号章节 · 极细边界
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root{
  --ink:#0B1F17;
  --coal:#111514;
  --brown:#1B1410;
  --moss:#2C4A3A;
  --cream:#F4EEDF;
  --cyan:#33F0D0;
  --orange:#FF6A1A;
  --mute:#8FA69C;
  --amber:#FFB347;

  --line:rgba(143,166,156,.20);
  --line-2:rgba(143,166,156,.36);
  --glow:rgba(51,240,208,.45);
  --tint-cyan:rgba(51,240,208,.10);
  --tint-orange:rgba(255,106,26,.12);

  --shadow-1:0 1px 0 rgba(0,0,0,.35), 0 18px 42px -32px rgba(0,0,0,.95);
  --shadow-2:0 28px 70px -46px rgba(0,0,0,1);

  --r:12px;
  --r-sm:8px;
  --r-pill:999px;

  --font-num:"Roboto Mono","DIN Alternate",ui-monospace,SFMono-Regular,Menlo,Consolas,"PingFang SC",monospace;
  --font-head:"Oswald","Barlow Condensed",system-ui,-apple-system,"PingFang SC","Noto Sans SC",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC",system-ui,-apple-system,"Segoe UI",sans-serif;

  --head-h:70px;
  --wrap:1280px;
  --ease:cubic-bezier(.22,.7,.28,1);
}

/* ---------- 2. Reset 与基础排版 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  min-height:100%;
  background:
    radial-gradient(1100px 560px at 8% -12%, rgba(44,74,58,.55), transparent 70%),
    radial-gradient(900px 480px at 96% -6%, var(--tint-orange), transparent 68%),
    var(--ink);
  color:var(--cream);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.7;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg,video{display:block;max-width:100%}
ul,ol{margin:0;padding:0;list-style:none}
p,figure,blockquote,h1,h2,h3,h4,h5{margin:0}
button{font:inherit;color:inherit;background:none;border:0}
a{color:var(--cyan);text-decoration:none;transition:color .18s var(--ease),opacity .18s var(--ease)}
a:hover{color:#7ff6e4}
strong{font-weight:600;color:var(--cream)}
::selection{background:var(--cyan);color:var(--ink)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:3px}

h1,h2,h3,h4,.font-head{
  font-family:var(--font-head);
  font-weight:600;
  line-height:1.06;
  letter-spacing:.012em;
}
h1{font-size:clamp(32px,5vw,58px)}
h2{font-size:clamp(26px,3.4vw,42px)}
h3{font-size:clamp(19px,2vw,25px)}
h4{font-size:17px}

/* ---------- 3. 通用工具 ---------- */
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 clamp(16px,2.4vw,28px)}
.wrap--narrow{max-width:860px}
.visually-hidden{
  position:absolute!important;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;
}
.hairline{height:1px;border:0;background:var(--line);margin:clamp(24px,3vw,40px) 0}
.section{padding:clamp(56px,7.5vw,112px) 0}
.section--tight{padding:clamp(34px,4.5vw,64px) 0}

.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:18px;padding-bottom:18px;margin-bottom:clamp(24px,3vw,40px);
  border-bottom:1px solid var(--line);
}
.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);display:inline-block}
.eyebrow--orange{color:var(--orange)}
.eyebrow--orange::before{background:var(--orange)}

.chapter{display:flex;align-items:baseline;gap:clamp(12px,1.6vw,22px);margin-bottom:14px}
.chapter__num{
  font-family:var(--font-num);font-weight:700;line-height:1;
  font-size:clamp(26px,3.6vw,44px);letter-spacing:-.03em;
  color:rgba(51,240,208,.34);
}
.chapter__title{font-family:var(--font-head);font-size:clamp(20px,2.6vw,32px);font-weight:600}

.prose{font-size:16px;line-height:1.85;color:rgba(244,238,223,.88)}
.prose p{max-width:64ch}
.prose p + p{margin-top:.9em}
.prose h2,.prose h3{margin:1.6em 0 .6em;color:var(--cream)}
.prose ul{margin:.8em 0;padding-left:1.1em;list-style:disc}
.prose li + li{margin-top:.35em}
.lede{font-size:clamp(16px,1.7vw,19px);line-height:1.8;color:rgba(244,238,223,.82);max-width:56ch}

/* ---------- 4. 布局网格 / 分屏 ---------- */
.grid{display:grid;gap:clamp(16px,1.8vw,26px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.split{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:clamp(20px,3vw,48px);align-items:start}
.split--reverse{grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr)}
.split--reverse > :first-child{order:2}

/* ---------- 5. 卡片与面板 ---------- */
.surface{
  position:relative;
  background:linear-gradient(165deg, rgba(44,74,58,.42), rgba(27,20,16,.92) 62%, rgba(17,21,20,.98));
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:clamp(18px,2.4vw,28px);
  box-shadow:var(--shadow-1);
  transition:transform .28s var(--ease),border-color .28s var(--ease),box-shadow .28s var(--ease);
}
.surface:hover{transform:translateY(-3px);border-color:var(--line-2);box-shadow:var(--shadow-2)}
.surface--flat:hover{transform:none}
.surface--cyan{border-color:var(--glow);background:linear-gradient(165deg, rgba(51,240,208,.14), rgba(11,31,23,.95) 68%)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border:1px solid var(--line-2);border-radius:var(--r-pill);
  font-family:var(--font-num);font-size:11px;letter-spacing:.1em;
  color:var(--mute);background:rgba(17,21,20,.55);white-space:nowrap;
}
.tag--cyan{color:var(--cyan);border-color:var(--glow);background:var(--tint-cyan)}
.tag--orange{color:var(--orange);border-color:rgba(255,106,26,.5);background:var(--tint-orange)}
.tag--amber{color:var(--amber);border-color:rgba(255,179,71,.45);background:rgba(255,179,71,.1)}

.stat{display:flex;flex-direction:column;gap:6px}
.stat__num{
  font-family:var(--font-num);font-weight:700;line-height:.95;letter-spacing:-.03em;
  font-size:clamp(38px,5.6vw,64px);color:var(--cyan);
}
.stat__num--orange{color:var(--orange)}
.stat__label{
  font-family:var(--font-num);font-size:12px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--mute);
}

.display-num{
  font-family:var(--font-num);font-weight:700;line-height:.86;letter-spacing:-.04em;
  font-size:clamp(88px,14vw,160px);color:var(--cyan);
}
.display-num--orange{color:var(--orange)}
.display-num__unit{font-size:.28em;color:var(--mute);margin-left:.12em;letter-spacing:.02em}

.meter{
  height:8px;border:1px solid var(--line);border-radius:var(--r-pill);
  background:rgba(44,74,58,.5);overflow:hidden;
}
.meter__fill{
  display:block;height:100%;width:calc(var(--v,60) * 1%);
  background:linear-gradient(90deg,var(--cyan),rgba(51,240,208,.4));
  border-radius:inherit;transition:width .9s var(--ease);
}
.meter--orange .meter__fill{background:linear-gradient(90deg,var(--amber),var(--orange))}

/* ---------- 6. 图片容器基础规则（页面阶段放置素材） ---------- */
.img-frame{
  position:relative;overflow:hidden;border:1px solid var(--line);border-radius:var(--r);
  background:linear-gradient(160deg, rgba(44,74,58,.6), rgba(11,31,23,.92) 58%, rgba(27,20,16,.96));
  box-shadow:var(--shadow-1);isolation:isolate;
}
.img-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:repeating-linear-gradient(115deg, rgba(143,166,156,.09) 0 1px, transparent 1px 15px);
}
.img-frame > img,.img-frame > picture > img{width:100%;height:100%;object-fit:cover;display:block}
.img-frame--wide{aspect-ratio:16/9}
.img-frame--square{aspect-ratio:1/1}
.img-frame--tall{aspect-ratio:3/4}
.img-frame--band{aspect-ratio:21/9}
.img-frame__caption{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:12px 14px;font-family:var(--font-num);font-size:11.5px;letter-spacing:.1em;
  color:var(--cream);background:linear-gradient(0deg, rgba(11,31,23,.92), transparent);
}

/* ---------- 7. 按钮与面包屑 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  padding:12px 22px;border:1px solid var(--line-2);border-radius:var(--r-pill);
  font-family:var(--font-head);font-size:14px;font-weight:600;letter-spacing:.08em;
  color:var(--cream);background:rgba(44,74,58,.2);cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--primary{background:var(--orange);border-color:var(--orange);color:#171310}
.btn--primary:hover{background:#ff8342;border-color:#ff8342;color:#171310}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);background:var(--tint-cyan)}
.btn--small{padding:8px 15px;font-size:12px;letter-spacing:.1em}

.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:.5em;
  font-family:var(--font-num);font-size:11.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--mute);
}
.breadcrumbs li{display:inline-flex;align-items:center;gap:.5em}
.breadcrumbs li + li::before{content:"/";color:var(--moss)}
.breadcrumbs a{color:var(--mute)}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs [aria-current="page"]{color:var(--cream)}

/* ---------- 8. 显现动效 ---------- */
html.js-reveal [data-reveal]{
  opacity:0;transform:translate3d(0,16px,0);
  transition:opacity .62s var(--ease),transform .62s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}
html.js-reveal [data-reveal].is-in{opacity:1;transform:none}

/* ---------- 9. 跳转链接 ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  transform:translateY(-180%);
  padding:10px 18px;border-radius:var(--r-pill);
  background:var(--cyan);color:var(--ink);
  font-family:var(--font-head);font-size:13px;font-weight:600;letter-spacing:.1em;
  transition:transform .22s var(--ease);
}
.skip-link:focus{transform:translateY(0);color:var(--ink)}

/* ---------- 10. 头部命令栏 ---------- */
.site-head{
  position:sticky;top:0;z-index:90;
  background:linear-gradient(180deg, rgba(17,21,20,.98), rgba(11,31,23,.95));
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  transition:border-color .25s var(--ease),box-shadow .25s var(--ease);
}
.site-head.is-tight{border-bottom-color:var(--line-2);box-shadow:0 20px 46px -38px #000}

.cmd-bar{position:relative}
.cmd-bar__inner{
  position:relative;
  width:100%;max-width:var(--wrap);margin:0 auto;
  padding:0 clamp(14px,2.4vw,28px);
  height:var(--head-h);
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;gap:clamp(10px,1.6vw,26px);
}

.cmd-bar__brand{display:flex;flex-direction:column;justify-content:center;gap:1px;color:var(--cream);white-space:nowrap}
.brand-mark{font-family:var(--font-head);font-size:19px;font-weight:600;letter-spacing:.16em;color:var(--cream);transition:color .2s var(--ease)}
.brand-mark::after{content:"●";font-size:9px;vertical-align:super;margin-left:6px;color:var(--orange)}
.cmd-bar__brand:hover .brand-mark{color:var(--cyan)}
.brand-tag{font-size:11px;letter-spacing:.06em;color:var(--mute)}

.cmd-bar__nav{justify-self:center;min-width:0}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{display:block}
.nav-link{
  display:inline-flex;align-items:baseline;gap:.5em;
  padding:8px 10px;border:1px solid transparent;border-radius:var(--r-pill);
  color:var(--mute);font-family:var(--font-head);font-size:14px;font-weight:600;letter-spacing:.05em;
  white-space:nowrap;
  transition:color .18s var(--ease),border-color .18s var(--ease),background .18s var(--ease);
}
.nav-num{font-family:var(--font-num);font-size:10px;font-weight:500;letter-spacing:.06em;color:rgba(143,166,156,.7)}
.nav-link:hover{color:var(--cream);border-color:var(--line);background:rgba(44,74,58,.28)}
.nav-link[aria-current="page"]{color:var(--cyan);border-color:var(--glow);background:var(--tint-cyan)}
.nav-link[aria-current="page"] .nav-num{color:var(--orange)}

.cmd-bar__side{justify-self:end;display:flex;align-items:center;gap:10px}
.status-pill{
  display:inline-flex;align-items:center;gap:7px;
  padding:5px 12px;border:1px solid var(--line);border-radius:var(--r-pill);
  background:rgba(27,20,16,.6);
  font-family:var(--font-num);font-size:11px;letter-spacing:.08em;color:var(--mute);white-space:nowrap;
}
.status-dot{
  width:7px;height:7px;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 0 3px rgba(51,240,208,.16);
  animation:pulse 2.6s infinite ease-in-out;
}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.42}}

.chip-row{display:inline-flex;gap:6px}
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:7px 13px;border:1px solid var(--line);border-radius:var(--r-pill);
  background:rgba(44,74,58,.18);color:var(--mute);
  font-family:var(--font-head);font-size:12px;font-weight:600;letter-spacing:.08em;white-space:nowrap;
  transition:color .18s var(--ease),border-color .18s var(--ease),background .18s var(--ease),transform .18s var(--ease);
}
.chip:hover{color:var(--cream);border-color:var(--glow);background:var(--tint-cyan);transform:translateY(-1px)}
.chip--find{color:var(--cyan);border-color:var(--glow)}

.cmd-bar__toggle{
  display:none;align-items:center;justify-content:center;
  width:44px;height:38px;border:1px solid var(--line-2);border-radius:var(--r-sm);
  background:rgba(44,74,58,.25);cursor:pointer;
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.cmd-bar__toggle:hover{border-color:var(--cyan);background:var(--tint-cyan)}
.toggle-icon{display:flex;flex-direction:column;gap:5px}
.toggle-bar{display:block;width:18px;height:2px;background:var(--cream);transition:transform .22s var(--ease),background .22s var(--ease)}
.cmd-bar__toggle[aria-expanded="true"] .toggle-bar:first-child{transform:translateY(3.5px) rotate(45deg);background:var(--cyan)}
.cmd-bar__toggle[aria-expanded="true"] .toggle-bar:last-child{transform:translateY(-3.5px) rotate(-45deg);background:var(--cyan)}

.scroll-progress{position:absolute;left:0;bottom:-1px;width:100%;height:2px;background:rgba(44,74,58,.5);overflow:hidden}
.scroll-progress__bar{
  display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
}

/* ---------- 11. 页脚 ---------- */
.site-foot{
  margin-top:clamp(60px,8vw,120px);
  background:linear-gradient(180deg, var(--coal), var(--brown));
  border-top:1px solid var(--line);
  color:var(--cream);
}
.site-foot__inner{
  width:100%;max-width:var(--wrap);margin:0 auto;
  padding:clamp(40px,6vw,74px) clamp(16px,2.4vw,28px) clamp(22px,3vw,32px);
}
.foot-grid{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) minmax(0,.9fr) minmax(0,.9fr) minmax(0,1.15fr);
  gap:clamp(24px,3vw,48px);
}
.foot-mark{font-family:var(--font-head);font-size:clamp(24px,3vw,34px);font-weight:600;letter-spacing:.1em;color:var(--cream)}
.foot-mark::after{content:"●";font-size:10px;vertical-align:super;margin-left:7px;color:var(--orange)}
.foot-tag{margin-top:8px;font-family:var(--font-num);font-size:12px;letter-spacing:.14em;color:var(--cyan)}
.foot-note{margin-top:14px;max-width:34ch;font-size:13px;line-height:1.8;color:var(--mute)}

.foot-col__title{
  margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--line);
  font-family:var(--font-num);font-size:11.5px;font-weight:500;letter-spacing:.2em;
  text-transform:uppercase;color:var(--mute);
}
.foot-list li + li{margin-top:9px}
.foot-list a{
  display:inline-block;font-size:14px;color:var(--cream);opacity:.86;
  transition:color .18s var(--ease),opacity .18s var(--ease),transform .18s var(--ease);
}
.foot-list a:hover{color:var(--cyan);opacity:1;transform:translateX(5px)}

.foot-contact li + li{margin-top:12px}
.contact-line{display:flex;flex-direction:column;gap:2px}
.contact-key{font-family:var(--font-num);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--mute)}
.contact-val{font-size:13.5px;line-height:1.6;color:var(--cream);word-break:break-all}

.foot-bottom{
  margin-top:clamp(28px,4vw,50px);padding-top:18px;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 24px;
}
.foot-legal{font-family:var(--font-num);font-size:11.5px;letter-spacing:.08em;color:var(--mute)}

/* ---------- 12. 响应式 ---------- */
@media (max-width:1420px){
  .status-pill{display:none}
}
@media (max-width:1180px){
  :root{--head-h:64px}
  .cmd-bar__inner{grid-template-columns:minmax(0,1fr) auto}
  .cmd-bar__toggle{display:inline-flex}
  .chip-row,.chip--find{display:none}
  .cmd-bar__nav{
    position:absolute;left:12px;right:12px;top:calc(100% + 8px);
    display:none;justify-self:stretch;
    padding:10px;border:1px solid var(--line-2);border-radius:var(--r);
    background:linear-gradient(180deg, rgba(27,20,16,.99), rgba(11,31,23,.99));
    box-shadow:var(--shadow-2);max-height:calc(100vh - 120px);overflow:auto;
  }
  .cmd-bar__nav[data-open]{display:block}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-link{
    width:100%;justify-content:flex-start;padding:13px 14px;border-radius:var(--r-sm);
    font-size:16px;border-color:transparent;
  }
  .nav-num{font-size:11px}
  .split,.split--reverse{grid-template-columns:minmax(0,1fr)}
  .split--reverse > :first-child{order:0}
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  .foot-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot-brand{grid-column:1 / -1}
  .foot-note{max-width:56ch}
}
@media (max-width:640px){
  body{font-size:15.5px}
  .brand-tag{display:none}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .foot-grid{grid-template-columns:minmax(0,1fr);gap:26px}
  .foot-bottom{flex-direction:column;align-items:flex-start}
  .display-num{font-size:clamp(72px,26vw,110px)}
  .section-head{align-items:flex-start}
}

/* ---------- 13. 无障碍减弱动效 ---------- */
@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.js-reveal [data-reveal],
  html.js-reveal [data-reveal].is-in{opacity:1;transform:none}
  .surface:hover,.btn:hover,.chip:hover,.foot-list a:hover{transform:none}
}