/* 博万体育 · /assets/site.css —— 共享外壳与基础组件 */

/* 01 reset */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd,address{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* 02 tokens */
:root{
  --ink:#0B2E29;
  --ink-2:#123F38;
  --neon:#38F2C8;
  --neon-soft:#A8FFF0;
  --orange:#FF8A3D;
  --gold:#FFD166;
  --wine:#7A1F3D;
  --indigo:#2E2A6B;
  --paper:#F4F1E9;
  --graphite:#1B1F1E;
  --gray:#6B7570;
  --fog:#C9CFC9;
  --line:rgba(56,242,200,.26);
  --line-strong:rgba(56,242,200,.55);
  --line-ink:rgba(27,31,30,.16);
  --paper-70:rgba(244,241,233,.7);
  --cut:16px;
  --wrap:1200px;
  --gutter:clamp(16px,4vw,48px);
  --ease:cubic-bezier(.22,.61,.36,1);
  --mono:ui-monospace,"JetBrains Mono","IBM Plex Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
}

/* 03 base type */
body{
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  color:var(--graphite);
  background:var(--paper);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-weight:900;line-height:1.08;letter-spacing:-.01em;font-stretch:condensed}
h1{font-size:clamp(34px,6vw,88px);line-height:1.02}
h2{font-size:clamp(26px,4vw,44px)}
h3{font-size:22px;font-weight:700;letter-spacing:0;line-height:1.35}
h4{font-size:17px;font-weight:700;letter-spacing:0;line-height:1.5}
p{max-width:68ch}
strong{font-weight:700}
::selection{background:var(--neon);color:var(--ink)}
:focus-visible{outline:2px solid var(--neon);outline-offset:3px;border-radius:2px}
:target{scroll-margin-top:110px}
img{-o-object-fit:cover;object-fit:cover}

.mono{font-family:var(--mono);letter-spacing:.08em}
.num{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}

/* 04 skip link */
.skip-link{
  position:absolute;left:var(--gutter);top:-120px;z-index:300;
  display:inline-block;padding:10px 18px;
  background:var(--neon);color:var(--ink);
  font-family:var(--mono);font-size:13px;letter-spacing:.08em;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:14px}

/* 05 header / command bar */
.cmd-bar{
  position:sticky;top:0;z-index:200;
  background:var(--ink);
  color:var(--paper);
  border-bottom:1px solid var(--line);
  isolation:isolate;
}
.cmd-bar::after{
  content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;
  background-image:repeating-linear-gradient(115deg,rgba(201,207,201,.07) 0 1px,transparent 1px 7px);
}
.cmd-bar__inner{
  width:100%;max-width:var(--wrap);margin:0 auto;
  padding:12px var(--gutter);
  display:grid;grid-template-columns:auto 1fr auto;align-items:center;
  gap:clamp(12px,2vw,32px);
  transition:padding .25s var(--ease);
}
.cmd-bar[data-condensed] .cmd-bar__inner{padding-top:6px;padding-bottom:6px}
.brand{display:flex;flex-direction:column;gap:2px;min-width:0}
.brand__mark{
  font-family:var(--sans);font-weight:900;font-stretch:condensed;
  font-size:21px;line-height:1.1;letter-spacing:.02em;color:var(--paper);
}
.brand__tagline{
  font-family:var(--mono);font-size:11px;line-height:1.2;
  letter-spacing:.16em;color:var(--neon);white-space:nowrap;
}
.site-nav{display:flex;justify-content:flex-end;align-items:center;min-width:0}
.site-nav__list{
  display:flex;align-items:center;gap:clamp(2px,.8vw,10px);
  flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none;
}
.site-nav__list::-webkit-scrollbar{display:none}
.site-nav__item{flex:0 0 auto}
.site-nav__link{
  display:inline-flex;align-items:center;gap:7px;
  padding:8px 11px;font-size:14px;line-height:1.4;white-space:nowrap;
  color:var(--paper);border:1px solid transparent;
  transition:color .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease);
}
.site-nav__index{
  font-family:var(--mono);font-size:10px;letter-spacing:.08em;color:var(--gold);
}
.site-nav__link:hover{color:var(--neon);border-color:var(--line)}
.site-nav__link[aria-current="page"]{background:var(--neon);color:var(--ink);font-weight:700}
.site-nav__link[aria-current="page"] .site-nav__index{color:var(--ink)}
.cmd-bar__actions{display:flex;align-items:center;gap:10px;justify-self:end}
.cmd-cta{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 18px;white-space:nowrap;
  font-family:var(--mono);font-size:13px;letter-spacing:.08em;
  background:var(--orange);color:var(--graphite);font-weight:700;
  -webkit-clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  transition:background-color .2s var(--ease),transform .2s var(--ease);
}
.cmd-cta:hover{background:var(--gold)}
.cmd-cta:active{transform:translateY(1px)}
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 13px;border:1px solid var(--line);
  font-family:var(--mono);font-size:12px;letter-spacing:.1em;color:var(--paper);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--line-strong);color:var(--neon)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:11px}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:1.5px;background:var(--neon);
  transition:transform .25s var(--ease);
}
.nav-toggle__bars::before{top:1px}
.nav-toggle__bars::after{bottom:1px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(4px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-4px) rotate(-45deg)}

/* 06 containers & zoning */
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.section{position:relative;padding:clamp(56px,8vw,120px) 0}
.section--paper{background:var(--paper);color:var(--graphite)}
.section--ink{background:var(--ink);color:var(--paper)}
.section--ink-2{background:var(--ink-2);color:var(--paper)}
.section--wine{background:var(--wine);color:var(--paper)}
.section--indigo{background:var(--indigo);color:var(--paper)}
.section--ink p,.section--ink-2 p,.section--wine p,.section--indigo p{color:var(--paper-70)}
.slant-top{
  -webkit-clip-path:polygon(0 34px,100% 0,100% 100%,0 100%);
  clip-path:polygon(0 34px,100% 0,100% 100%,0 100%);
}
.divider-band{
  height:12px;
  background:linear-gradient(90deg,var(--wine) 0 34%,var(--indigo) 34% 68%,var(--neon) 68% 100%);
  -webkit-clip-path:polygon(0 0,100% 0,calc(100% - 28px) 100%,0 100%);
  clip-path:polygon(0 0,100% 0,calc(100% - 28px) 100%,0 100%);
}
.cut-panel{
  position:relative;padding:clamp(18px,2.4vw,28px);
  background:var(--ink-2);color:var(--paper);
  -webkit-clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
  clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
}
.tick-frame{position:relative;border:1px solid var(--line)}
.tick-frame::before,
.tick-frame::after{
  content:"";position:absolute;width:16px;height:16px;pointer-events:none;
  border:2px solid var(--neon);
}
.tick-frame::before{top:-1px;left:-1px;border-right:0;border-bottom:0}
.tick-frame::after{bottom:-1px;right:-1px;border-left:0;border-top:0}

/* 07 chapter headings */
.chapter-head{
  display:grid;grid-template-columns:auto minmax(0,1fr);
  gap:clamp(14px,2.4vw,32px);align-items:start;
  margin-bottom:clamp(28px,4vw,56px);
}
.chapter-no{
  font-family:var(--mono);font-size:clamp(30px,4.4vw,52px);line-height:1;
  letter-spacing:.08em;color:var(--gold);
}
.chapter-kicker{
  display:block;font-family:var(--mono);font-size:12px;line-height:1.4;
  letter-spacing:.18em;text-transform:uppercase;color:var(--neon);margin-bottom:10px;
}
.section--paper .chapter-kicker{color:var(--wine)}
.chapter-title{font-size:clamp(28px,4.4vw,56px);font-weight:900;font-stretch:condensed;line-height:1.04}
.chapter-lede{margin-top:12px;max-width:34ch;font-size:17px;line-height:1.7;opacity:.88}

/* 08 crumbs */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:18px 0;font-family:var(--mono);font-size:12px;
  letter-spacing:.08em;color:var(--gray);
}
.crumbs a{color:var(--gray);border-bottom:1px solid var(--line-ink)}
.crumbs a:hover{color:var(--ink);border-bottom-color:var(--neon)}
.crumbs__sep{color:var(--fog)}
.crumbs__current{color:var(--ink)}

/* 09 buttons & chips */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 22px;font-size:15px;font-weight:700;line-height:1.4;
  border:1px solid transparent;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease),transform .2s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--solid{
  background:var(--neon);color:var(--ink);border-color:var(--neon);
  -webkit-clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
  clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
}
.btn--solid:hover{background:var(--neon-soft)}
.btn--line{background:transparent;color:inherit;border-color:currentColor}
.btn--line:hover{background:var(--ink);color:var(--neon);border-color:var(--ink);box-shadow:3px 3px 0 rgba(56,242,200,.4)}
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 13px;background:transparent;color:inherit;
  border:1px solid currentColor;font-family:var(--mono);font-size:12px;letter-spacing:.06em;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.chip:hover{border-color:var(--neon);color:var(--neon)}
.chip[aria-pressed="true"]{background:var(--neon);border-color:var(--neon);color:var(--ink);font-weight:700}

/* 10 media containers */
.media{
  position:relative;overflow:hidden;isolation:isolate;
  background:var(--ink-2);width:100%;
}
.media>img,.media>picture>img{width:100%;height:100%;-o-object-fit:cover;object-fit:cover}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--3x4{aspect-ratio:3/4}
.media--1x1{aspect-ratio:1/1}
.media--wide{aspect-ratio:21/9}
.media__caption{
  margin-top:10px;font-family:var(--mono);font-size:12px;
  letter-spacing:.06em;color:var(--gray);
}
.grain{position:relative}
.grain::after{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:2;
  background-image:
    repeating-linear-gradient(0deg,rgba(201,207,201,.1) 0 1px,transparent 1px 3px),
    repeating-linear-gradient(90deg,rgba(201,207,201,.07) 0 1px,transparent 1px 4px);
}

/* 11 grid helpers */
.grid{display:grid;gap:clamp(16px,2.2vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

/* 12 data anchors */
.scorebar{
  display:inline-flex;align-items:center;gap:14px;
  padding:12px 18px;background:var(--orange);color:var(--graphite);
  font-family:var(--mono);font-size:15px;font-weight:700;letter-spacing:.08em;
  -webkit-clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
  clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
}

/* 13 timeline */
.timeline{--tl-pad:clamp(20px,3vw,42px);position:relative;padding-left:var(--tl-pad);border-left:1px solid var(--line-strong)}
.timeline__item{position:relative;padding-bottom:clamp(24px,3.2vw,44px)}
.timeline__item::before{
  content:"";position:absolute;top:9px;left:calc(-1 * var(--tl-pad) - 4.5px);
  width:8px;height:8px;border-radius:50%;background:var(--gold);
}
.timeline__time{
  display:inline-block;margin-bottom:6px;font-family:var(--mono);
  font-size:12px;letter-spacing:.1em;color:var(--orange);
}

/* 14 horizontal rail */
.rail{position:relative}
.rail__track{
  display:flex;gap:clamp(14px,2vw,22px);
  overflow-x:auto;scroll-snap-type:x proximity;
  padding:4px 2px 18px;scrollbar-width:none;-ms-overflow-style:none;
  cursor:-webkit-grab;cursor:grab;
}
.rail__track::-webkit-scrollbar{display:none}
.rail__track[data-dragging]{cursor:-webkit-grabbing;cursor:grabbing}
.rail__track[data-dragging] .rail__item{outline:1px solid var(--neon);outline-offset:-1px}
.rail__item{
  flex:0 0 auto;width:clamp(240px,30vw,340px);
  scroll-snap-align:start;
}
.rail__nav{display:flex;justify-content:flex-end;gap:8px;margin-top:4px}
.rail__btn{
  display:grid;place-items:center;width:42px;height:42px;
  border:1px solid currentColor;color:inherit;font-family:var(--mono);font-size:15px;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.rail__btn:not([disabled]):hover{background:var(--neon);border-color:var(--neon);color:var(--ink)}
.rail__btn[disabled]{opacity:.3;cursor:not-allowed}

/* 15 chapter index */
.chapter-index{
  position:fixed;left:max(10px,calc((100vw - var(--wrap)) / 2 - 96px));top:50%;
  transform:translateY(-50%);z-index:120;
  display:flex;flex-direction:column;gap:12px;
  padding:14px 12px;
  background:rgba(11,46,41,.86);
  border:1px solid var(--line);
  font-family:var(--mono);font-size:11px;letter-spacing:.08em;
}
.chapter-index__link{
  display:flex;align-items:center;gap:9px;color:rgba(244,241,233,.55);
  transition:color .2s var(--ease);
}
.chapter-index__link::before{
  content:"";display:block;width:12px;height:1px;background:currentColor;
  transition:width .2s var(--ease),background-color .2s var(--ease);
}
.chapter-index__link:hover{color:var(--neon-soft)}
.chapter-index__link[aria-current="true"]{color:var(--neon)}
.chapter-index__link[aria-current="true"]::before{width:26px;background:var(--neon)}

/* 16 footer */
.site-foot{
  position:relative;background:var(--ink);color:var(--paper);
  padding:clamp(52px,7vw,96px) 0 0;margin-top:0;
}
.site-foot::before{
  content:"";position:absolute;top:0;left:0;right:0;height:10px;
  background:linear-gradient(90deg,var(--wine) 0 33%,var(--indigo) 33% 66%,var(--neon) 66% 100%);
  -webkit-clip-path:polygon(0 0,100% 0,calc(100% - 26px) 100%,26px 100%);
  clip-path:polygon(0 0,100% 0,calc(100% - 26px) 100%,26px 100%);
}
.site-foot::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(115deg,rgba(201,207,201,.06) 0 1px,transparent 1px 8px);
}
.site-foot__inner{
  position:relative;z-index:1;
  width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter);
  display:grid;grid-template-columns:1.15fr 1.7fr 1.15fr;
  gap:clamp(26px,4vw,56px);
}
.site-foot__brand{display:flex;flex-direction:column;gap:10px}
.site-foot__mark{
  font-weight:900;font-stretch:condensed;font-size:26px;line-height:1.1;
  letter-spacing:.02em;color:var(--paper);
}
.site-foot__tagline{
  font-family:var(--mono);font-size:12px;letter-spacing:.14em;color:var(--neon);
}
.site-foot__note{font-size:14px;line-height:1.7;color:var(--paper-70);max-width:32ch}
.foot-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,2vw,32px)}
.foot-nav__group{min-width:0}
.foot-nav__title{
  font-family:var(--mono);font-size:11px;font-weight:400;
  letter-spacing:.18em;text-transform:uppercase;color:var(--gold);margin-bottom:14px;
}
.foot-nav__list{display:flex;flex-direction:column;gap:10px}
.foot-nav__link{
  align-self:flex-start;font-size:14.5px;line-height:1.5;color:var(--paper-70);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.foot-nav__link:hover{color:var(--neon);border-bottom-color:var(--neon)}
.foot-contact{display:flex;flex-direction:column;gap:14px;min-width:0}
.foot-contact__title{
  font-family:var(--mono);font-size:11px;font-weight:400;
  letter-spacing:.18em;text-transform:uppercase;color:var(--gold);
}
.foot-contact__list{display:flex;flex-direction:column;gap:12px}
.foot-contact__row{display:flex;flex-direction:column;gap:3px}
.foot-contact__key{
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--neon-soft);opacity:.85;
}
.foot-contact__val{font-size:14.5px;line-height:1.6;color:var(--paper);word-break:break-word}
.foot-contact__hint{font-size:13px;line-height:1.65;color:var(--gray);max-width:34ch}
.copy-btn{
  align-self:flex-start;display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;border:1px solid var(--line);
  font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--neon);
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.copy-btn:hover{background:var(--neon);border-color:var(--neon);color:var(--ink)}
.copy-btn[data-copied]{background:var(--neon);border-color:var(--neon);color:var(--ink)}
.site-foot__base{
  position:relative;z-index:1;
  width:100%;max-width:var(--wrap);margin:clamp(34px,5vw,60px) auto 0;
  padding:18px var(--gutter) 26px;
  display:flex;flex-wrap:wrap;gap:8px 28px;justify-content:space-between;
  border-top:1px solid rgba(56,242,200,.16);
  font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:rgba(244,241,233,.6);
}
.site-foot__legal,.site-foot__year{margin:0;max-width:none}

/* 17 back to top */
.to-top{
  position:fixed;right:clamp(14px,3vw,34px);bottom:clamp(14px,3vw,34px);z-index:220;
  width:58px;height:58px;display:grid;place-items:center;
  border-radius:50%;background:var(--ink-2);color:var(--neon);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s var(--ease);
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--ink)}
.to-top__ring{
  position:absolute;inset:0;width:100%;height:100%;
  transform:rotate(-90deg);
}
.to-top__track{fill:none;stroke:rgba(56,242,200,.22);stroke-width:2}
.to-top__bar{
  fill:none;stroke:var(--neon);stroke-width:2;stroke-linecap:round;
  stroke-dasharray:151;stroke-dashoffset:151;
}
.to-top__label{position:relative;z-index:1;font-family:var(--mono);font-size:11px;letter-spacing:.08em}

/* 18 reveal */
html.js-motion [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}
html.js-motion [data-reveal][data-shown]{opacity:1;transform:translateY(0)}

/* 19 responsive */
@media (max-width:1080px){
  .chapter-index{display:none}
}
@media (max-width:1024px){
  .site-foot__inner{grid-template-columns:1fr 1fr}
  .site-foot__brand{grid-column:1 / -1}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  .cmd-bar__inner{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
  .brand{flex:1 1 auto}
  .cmd-bar__actions{flex:0 0 auto}
  .nav-toggle{display:inline-flex}
  .site-nav{
    order:3;flex:1 0 100%;display:none;
    justify-content:flex-start;
    border-top:1px solid var(--line);margin-top:8px;padding-top:10px;
  }
  .site-nav[data-open="true"]{display:block}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;overflow:visible}
  .site-nav__item{width:100%}
  .site-nav__link{
    justify-content:flex-start;width:100%;padding:13px 10px;
    border-bottom:1px solid rgba(56,242,200,.14);
  }
  .site-nav__item:last-child .site-nav__link{border-bottom:0}
  .grid--2,.grid--3{grid-template-columns:1fr}
  .chapter-head{grid-template-columns:1fr;gap:8px}
  .timeline{--tl-pad:22px}
}
@media (max-width:640px){
  .site-foot__inner{grid-template-columns:1fr}
  .foot-nav{grid-template-columns:1fr 1fr}
  .site-foot__base{flex-direction:column;gap:6px}
  .brand__tagline{font-size:10px;letter-spacing:.1em}
  .cmd-cta{padding:9px 13px;font-size:12px}
}
@media (min-width:901px){
  .site-nav[data-open]{display:flex}
}

/* 20 reduced motion */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
  html.js-motion [data-reveal]{opacity:1;transform:none}
  .to-top{transition:opacity .01ms linear}
  .rail__track{scroll-behavior:auto}
}