/* ==========================================================================
   博业赛事 · 共享外壳样式  /assets/site.css
   结构：1 变量 2 reset 3 排版 4 基础组件 5 头部 6 页脚 7 响应式
   ========================================================================== */

/* 1. 变量 ---------------------------------------------------------------- */
:root{
  --sand:#E8D5B7;
  --sand-deep:#C9A876;
  --pine:#1F5B4E;
  --pine-light:#2E7D6B;
  --board:#12263A;
  --orange:#FF6B2C;
  --slate:#5B6B7A;
  --paper:#F7F3EA;
  --ink:#161A1D;
  --mist:#A8B8AE;

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

  --gutter:24px;
  --maxw:1280px;
  --line:1px solid var(--ink);
  --shadow-paper:4px 4px 0 var(--ink);
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* 2. Reset --------------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:96px;
}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
a{color:var(--pine-light);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
::selection{background:var(--orange);color:var(--ink)}
:focus-visible{
  outline:3px solid var(--orange);
  outline-offset:2px;
  box-shadow:0 0 0 5px rgba(22,26,29,.35);
}

/* 3. 排版 ---------------------------------------------------------------- */
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--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(--font-display);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.1;
  color:var(--ink);
}
h1{font-size:clamp(2.375rem,5vw,4rem);line-height:1.06}
h2{font-size:clamp(1.75rem,3.2vw,2.5rem);line-height:1.15}
h3{font-size:clamp(1.125rem,1.7vw,1.5rem);line-height:1.3}
h4{font-size:1rem;line-height:1.4}
p{line-height:1.75}
strong{font-weight:700}
code,kbd,samp,.num,.is-num{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

.lede{
  font-size:clamp(16px,1.35vw,18px);
  line-height:1.85;
  color:var(--slate);
  max-width:62ch;
  margin-top:16px;
}
.doc{font-size:15px;line-height:1.65}
.doc h2{font-size:18px;margin:32px 0 12px}
.doc h3{font-size:16px;margin:24px 0 8px}
.doc p{margin-bottom:12px;line-height:1.65}
.doc ul,.doc ol{list-style:disc;padding-left:20px;margin-bottom:12px}
.doc table{font-size:13px;border-collapse:collapse;width:100%}
.doc th,.doc td{border-bottom:1px solid var(--mist);padding:8px;text-align:left}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--pine);
  margin-bottom:14px;
}
.eyebrow::before{content:"";width:28px;height:2px;background:var(--orange)}

/* 4. 基础组件 ------------------------------------------------------------ */
.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(48px,7vw,88px)}
.section--tight{padding-block:clamp(32px,4vw,56px)}
.band{background:var(--board);color:var(--paper)}
.rule{height:1px;background:var(--ink);border:0;margin:0}
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
  margin-bottom:clamp(24px,3vw,40px);
}
.section-head h2{max-width:24ch}

/* 跳转链接 */
.skip-link{
  position:absolute;
  left:16px;
  top:-72px;
  z-index:200;
  background:var(--ink);
  color:var(--paper);
  padding:10px 18px;
  font-size:14px;
  font-weight:700;
  border:2px solid var(--orange);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:12px;text-decoration:none}

/* 网格 */
.grid{display:grid;gap:var(--gutter)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}

/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:700;
  line-height:1.1;
  letter-spacing:.02em;
  padding:11px 18px;
  border:1px solid var(--ink);
  border-radius:0;
  background:var(--paper);
  color:var(--ink);
  text-decoration:none;
  cursor:pointer;
  transition:transform .16s var(--ease),box-shadow .16s var(--ease),background-color .16s var(--ease),color .16s var(--ease);
}
.btn:hover{text-decoration:none;transform:translate(-1px,-1px);box-shadow:4px 4px 0 var(--ink)}
.btn:active{transform:translate(1px,1px);box-shadow:none}
.btn--accent{background:var(--orange);color:var(--ink);box-shadow:3px 3px 0 var(--ink)}
.btn--accent:hover{box-shadow:5px 5px 0 var(--ink)}
.btn--ghost{background:transparent}
.btn--dark{background:var(--board);color:var(--paper);border-color:var(--board)}
.btn--dark:hover{box-shadow:4px 4px 0 var(--orange)}
.btn--sm{padding:8px 13px;font-size:12.5px}

/* 标签 */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.12em;
  line-height:1.3;
  padding:4px 8px;
  background:var(--sand);
  color:var(--ink);
  border:var(--line);
}
.tag--accent{background:var(--orange)}
.tag--dark{background:var(--board);color:var(--paper);border-color:var(--board)}

/* 卡片与影像 */
.card{
  position:relative;
  background:var(--paper);
  border:var(--line);
  box-shadow:var(--shadow-paper);
  padding:clamp(18px,2.4vw,28px);
}
.card--sand{background:var(--sand)}
.card--board{background:var(--board);color:var(--paper);box-shadow:4px 4px 0 var(--orange)}
.card--board h2,.card--board h3{color:var(--paper)}

.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  background:var(--slate);
  border:var(--line);
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  filter:saturate(.85) contrast(1.05);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:radial-gradient(rgba(255,255,255,.14) 1px,transparent 1px);
  background-size:3px 3px;
  mix-blend-mode:overlay;
}
.media-frame--16-9{aspect-ratio:16/9}
.media-frame--4-3{aspect-ratio:4/3}
.media-frame--1-1{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame__tag{position:absolute;left:0;top:0;z-index:2}

/* 数据 */
.stat{display:flex;flex-direction:column;gap:4px}
.stat__num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(28px,4vw,44px);
  font-weight:600;
  line-height:1;
  letter-spacing:-.02em;
  color:var(--pine);
}
.stat__label{font-size:12px;letter-spacing:.08em;color:var(--slate)}
.data-strip{
  display:flex;
  gap:16px;
  overflow-x:auto;
  scroll-snap-type:x mandatory;
  -webkit-overflow-scrolling:touch;
  padding-bottom:12px;
  scrollbar-width:thin;
}
.data-strip > *{scroll-snap-align:start;flex:0 0 auto}

/* 面包屑 */
.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--slate);
  padding:18px 0;
}
.breadcrumbs a{color:var(--slate);border-bottom:1px solid var(--mist);text-decoration:none}
.breadcrumbs a:hover{color:var(--ink);border-bottom-color:var(--orange);text-decoration:none}
.breadcrumbs__sep{color:var(--mist)}
.breadcrumbs [aria-current="page"]{color:var(--ink);font-weight:600}

/* 渐显协议 */
[data-reveal]{transition:opacity .45s var(--ease),transform .45s var(--ease)}
html.has-js [data-reveal]:not(.is-visible){opacity:0;transform:translateY(12px)}

/* 5. 头部 ---------------------------------------------------------------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--paper);
  border-bottom:var(--line);
}
.header__inner{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding:10px var(--gutter);
  display:flex;
  align-items:center;
  gap:18px;
}

.brand{
  display:flex;
  align-items:center;
  gap:8px;
  flex:0 0 auto;
  color:var(--ink);
  text-decoration:none;
  padding:2px 0;
}
.brand:hover{text-decoration:none}
.brand__name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:22px;
  letter-spacing:-.02em;
  line-height:1;
}
.brand__tag{
  display:inline-flex;
  align-items:center;
  gap:4px;
  font-size:12px;
  font-weight:700;
  letter-spacing:.06em;
  line-height:1;
  color:var(--pine);
  background:var(--sand);
  border:var(--line);
  padding:4px 6px;
}
.brand__slash{font-family:var(--font-mono);color:var(--orange);font-weight:700}

.header__nav{flex:1 1 auto;min-width:0}
.nav__list{display:flex;align-items:center;gap:2px;flex-wrap:wrap}
.nav__item{position:relative}
.nav__item[hidden]{display:none}
.nav__link{
  display:inline-flex;
  align-items:baseline;
  gap:5px;
  padding:7px 9px;
  font-size:14px;
  font-weight:700;
  letter-spacing:.01em;
  color:var(--ink);
  border:1px solid transparent;
  text-decoration:none;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.nav__link:hover{background:var(--sand);border-color:var(--ink);text-decoration:none}
.nav__idx{
  font-family:var(--font-mono);
  font-size:10px;
  font-weight:500;
  letter-spacing:.06em;
  line-height:1;
  color:var(--slate);
  transform:translateY(-2px);
}
.nav__link[aria-current="page"]{background:var(--pine);color:var(--paper);border-color:var(--pine)}
.nav__link[aria-current="page"] .nav__idx{color:var(--orange)}

.header__tools{
  display:flex;
  align-items:center;
  gap:8px;
  flex:0 0 auto;
  margin-left:auto;
}
.header__cta{padding:9px 14px}
.header__ghost{padding:9px 14px}

.segmented{
  display:inline-flex;
  gap:2px;
  padding:2px;
  background:var(--paper);
  border:var(--line);
}
.segmented__btn{
  appearance:none;
  border:0;
  background:transparent;
  color:var(--slate);
  font-family:var(--font-body);
  font-size:12px;
  font-weight:700;
  letter-spacing:.06em;
  line-height:1.2;
  padding:5px 9px;
  cursor:pointer;
  border-radius:0;
  transition:background-color .18s var(--ease),color .18s var(--ease);
}
.segmented__btn:hover{background:var(--sand);color:var(--ink)}
.segmented__btn[aria-pressed="true"]{background:var(--orange);color:var(--ink)}

.nav-search{position:relative;display:inline-flex;align-items:center}
.nav-search__hint{
  position:absolute;
  left:7px;
  top:50%;
  transform:translateY(-50%);
  font-family:var(--font-mono);
  font-size:11px;
  color:var(--slate);
  pointer-events:none;
}
.nav-search__input{
  width:126px;
  padding:7px 8px 7px 21px;
  border:var(--line);
  border-radius:0;
  background:var(--paper);
  font-family:var(--font-body);
  font-size:12px;
  line-height:1.4;
  appearance:none;
}
.nav-search__input::placeholder{color:var(--slate)}
.nav-search__input:focus{background:#fff;box-shadow:inset 3px 0 0 var(--orange)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:9px 12px;
  background:var(--paper);
  border:var(--line);
  font-size:13px;
  font-weight:700;
  line-height:1;
  cursor:pointer;
  border-radius:0;
}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bars span{
  display:block;
  height:2px;
  width:100%;
  background:var(--ink);
  transition:transform .18s var(--ease),opacity .18s var(--ease);
}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.header__progress{
  position:absolute;
  left:0;
  bottom:0;
  width:0;
  height:2px;
  background:var(--orange);
  pointer-events:none;
  z-index:2;
}

/* 6. 页脚 ---------------------------------------------------------------- */
.site-footer{
  margin-top:clamp(48px,7vw,96px);
  background:var(--board);
  color:var(--paper);
  border-top:6px solid var(--orange);
}
.footer__inner{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding:clamp(32px,5vw,60px) var(--gutter);
  display:grid;
  grid-template-columns:minmax(240px,1.5fr) minmax(0,1fr) minmax(0,1fr) minmax(230px,1.25fr);
  gap:clamp(24px,3vw,44px);
}
.footer__brand{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.footer__logo{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(22px,2.4vw,28px);
  line-height:1.1;
  letter-spacing:-.02em;
  color:var(--paper);
}
.footer__slash{color:var(--orange);font-family:var(--font-mono);margin:0 4px}
.footer__desc{font-size:13.5px;line-height:1.7;color:var(--mist);max-width:26ch}
.footer__rule{display:block;width:52px;height:3px;background:var(--orange)}

.footer__title{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--mist);
  padding-bottom:10px;
  margin-bottom:14px;
  border-bottom:1px solid rgba(168,184,174,.32);
}
.footer__list{display:flex;flex-direction:column;gap:9px}
.footer__link{
  display:inline-flex;
  align-items:baseline;
  gap:8px;
  font-size:14px;
  color:var(--paper);
  text-decoration:none;
  transition:color .16s var(--ease);
}
.footer__link::before{
  content:"";
  width:12px;
  height:1px;
  background:var(--mist);
  transform:translateY(-3px);
  transition:width .16s var(--ease),background-color .16s var(--ease);
}
.footer__link:hover{color:var(--orange);text-decoration:none}
.footer__link:hover::before{width:20px;background:var(--orange)}

.footer__contact{
  display:flex;
  flex-direction:column;
  gap:3px;
  font-family:var(--font-mono);
  font-size:12.5px;
  line-height:1.65;
  color:var(--paper);
  margin-bottom:11px;
  word-break:break-word;
}
.footer__label{
  font-family:var(--font-body);
  font-size:11px;
  font-weight:600;
  letter-spacing:.14em;
  color:var(--mist);
}
.footer__hint{
  font-size:12px;
  line-height:1.65;
  color:var(--mist);
  border-left:2px solid var(--orange);
  padding-left:10px;
  margin-top:4px;
}

.footer__legal{
  background:var(--sand);
  color:var(--ink);
  border-top:var(--line);
}
.footer__legal-inner{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding:14px var(--gutter);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px 24px;
  font-size:12px;
  line-height:1.6;
}
.footer__copy,.footer__icp{font-family:var(--font-mono);letter-spacing:.02em;color:var(--ink)}
.footer__legal-links{display:flex;flex-wrap:wrap;gap:18px;margin-left:auto}
.footer__legal-links a{
  font-weight:700;
  color:var(--ink);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:border-color .16s var(--ease),color .16s var(--ease);
}
.footer__legal-links a:hover{border-bottom-color:var(--ink);text-decoration:none;color:var(--pine)}

/* 7. 响应式 -------------------------------------------------------------- */
@media (max-width:1240px){
  .brand__tag{display:none}
}
@media (max-width:1100px){
  .header__ghost{display:none}
}
@media (max-width:1040px){
  .nav-toggle{display:inline-flex}
  .nav-search{display:none}
  .header__nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    display:none;
    background:var(--paper);
    border-top:var(--line);
    border-bottom:var(--line);
    padding:8px var(--gutter) 16px;
    max-height:calc(100vh - 96px);
    overflow-y:auto;
  }
  .site-header[data-open] .header__nav{display:block}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__link{
    width:100%;
    justify-content:flex-start;
    padding:13px 8px;
    font-size:16px;
    border-bottom:1px solid var(--mist);
  }
  .nav__link[aria-current="page"]{border-color:var(--pine)}
  .nav__idx{font-size:11px}
  .header__tools{gap:6px}
}
@media (max-width:960px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__inner{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
  .footer__brand{grid-column:1 / -1}
  .footer__col--contact{grid-column:1 / -1}
}
@media (max-width:620px){
  .grid--2,.grid--3{grid-template-columns:1fr}
  .footer__inner{grid-template-columns:1fr}
  .footer__legal-inner{flex-direction:column;align-items:flex-start;gap:6px}
  .footer__legal-links{margin-left:0}
  .section-head{flex-direction:column;align-items:flex-start}
}
@media (max-width:560px){
  :root{--gutter:16px}
  .segmented--league{display:none}
  .brand__name{font-size:19px}
  .header__cta{padding:9px 12px;font-size:13px}
  .header__inner{gap:10px}
  h1{font-size:2.375rem;line-height:1.12}
}

/* 动效降级 */
@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.has-js [data-reveal]:not(.is-visible){opacity:1;transform:none}
}