/* ===== 必赢赛场 · 共享样式 /assets/site.css ===== */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:120px}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,picture{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ---------- tokens ---------- */
:root{
  --bw-ink:#0E1116;
  --bw-ink-deep:#080A0D;
  --bw-lime:#9DFF3C;
  --bw-clay:#FF5C3A;
  --bw-bone:#F2EFE6;
  --bw-steel:#5C7A99;
  --bw-surface:#1C2A35;
  --bw-lime-soft:#C9F7A8;
  --bw-clay-deep:#B33A1F;
  --bw-neutral:#3A3F47;
  --bw-neutral-light:#A8B0B8;

  --bw-font-head:"Noto Sans SC","PingFang SC","Microsoft YaHei","Alibaba PuHuiTi",sans-serif;
  --bw-font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --bw-font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --bw-header-h:92px;
  --bw-radius:6px;
  --bw-capsule:999px;
  --bw-line:2px solid var(--bw-neutral);
  --bw-shadow-hard:6px 6px 0 rgba(58,63,71,.95);
  --bw-shadow-lime:6px 6px 0 rgba(157,255,60,.38);
  --bw-shadow-clay:6px 6px 0 rgba(255,92,58,.42);
  --bw-shadow-deep:0 26px 60px rgba(0,0,0,.6);
  --bw-ease:cubic-bezier(.2,.7,.2,1);
}

/* ---------- base ---------- */
body{
  min-height:100vh;
  padding-top:var(--bw-header-h);
  background-color:var(--bw-ink);
  color:var(--bw-bone);
  font-family:var(--bw-font-body);
  font-size:16px;
  line-height:1.8;
  letter-spacing:.005em;
  overflow-x:hidden;
  background-image:
    linear-gradient(rgba(92,122,153,.075) 1px,transparent 1px),
    linear-gradient(90deg,rgba(92,122,153,.075) 1px,transparent 1px),
    radial-gradient(900px 520px at 88% -6%,rgba(157,255,60,.13),transparent 62%),
    radial-gradient(760px 460px at 2% 6%,rgba(255,92,58,.11),transparent 60%);
  background-size:64px 64px,64px 64px,auto,auto;
}
h1,h2,h3,h4{font-family:var(--bw-font-head);font-weight:900;line-height:1.16;letter-spacing:-.02em}
h1{font-size:clamp(34px,5.4vw,64px)}
h2{font-size:clamp(26px,3.6vw,42px)}
h3{font-size:clamp(20px,2.4vw,28px)}
h4{font-size:clamp(17px,1.8vw,20px)}
p{max-width:760px}
strong{color:var(--bw-lime)}
code,kbd,samp,pre{font-family:var(--bw-font-mono)}

:focus-visible{outline:3px solid var(--bw-lime);outline-offset:3px;border-radius:3px}

.bw-sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* skip link */
.bw-skip{
  position:fixed;left:14px;top:10px;z-index:200;
  padding:10px 18px;border-radius:var(--bw-capsule);
  background:var(--bw-lime);color:var(--bw-ink);
  font-family:var(--bw-font-mono);font-size:13px;font-weight:700;letter-spacing:.06em;
  transform:translateY(-160%);
  transition:transform .2s var(--bw-ease);
}
.bw-skip:focus{transform:translateY(0)}

/* ---------- layout ---------- */
.bw-container{width:100%;max-width:1220px;margin-inline:auto;padding-inline:clamp(16px,3.4vw,32px)}
.bw-section{padding-block:clamp(46px,7vw,104px)}
.bw-section--band{
  background:linear-gradient(180deg,rgba(28,42,53,.92),rgba(14,17,22,.25));
  border-top:var(--bw-line);border-bottom:var(--bw-line);
}
.bw-rule{height:2px;border:0;background:linear-gradient(90deg,var(--bw-lime) 0 90px,var(--bw-neutral) 90px 100%);margin-block:clamp(22px,3vw,38px)}

.bw-chapter{position:relative;display:flex;flex-wrap:wrap;align-items:baseline;gap:clamp(12px,2.4vw,28px);margin-bottom:clamp(18px,2.6vw,32px)}
.bw-chapter__index{
  font-family:var(--bw-font-mono);font-weight:700;
  font-size:clamp(52px,9vw,124px);line-height:.82;letter-spacing:-.05em;
  color:rgba(92,122,153,.22);
  -webkit-text-stroke:1.5px rgba(92,122,153,.55);
}
.bw-eyebrow{
  display:inline-flex;align-items:center;gap:.6em;
  font-family:var(--bw-font-mono);font-size:12px;font-weight:700;
  letter-spacing:.2em;text-transform:uppercase;color:var(--bw-lime);
}
.bw-eyebrow::before{content:"";width:26px;height:3px;background:var(--bw-lime);display:block}

.bw-breadcrumb{margin:0 0 clamp(18px,2.6vw,30px);padding-top:clamp(20px,3vw,36px)}
.bw-breadcrumb ol{display:flex;flex-wrap:wrap;gap:.5em;font-family:var(--bw-font-mono);font-size:12px;letter-spacing:.1em;color:var(--bw-neutral-light)}
.bw-breadcrumb li+li::before{content:"/";margin-right:.5em;color:var(--bw-neutral)}
.bw-breadcrumb a:hover{color:var(--bw-lime)}

.bw-prose{max-width:680px;font-size:15.5px;line-height:1.85;color:rgba(242,239,230,.9)}
.bw-prose p+p{margin-top:1.05em}
.bw-prose a{color:var(--bw-lime);border-bottom:2px solid rgba(157,255,60,.4)}
.bw-prose a:hover{border-bottom-color:var(--bw-lime)}

/* ---------- grid ---------- */
.bw-grid{display:grid;gap:clamp(16px,2.4vw,30px)}
.bw-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.bw-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.bw-grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* ---------- buttons ---------- */
.bw-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  padding:12px 24px;border:2px solid var(--bw-bone);border-radius:var(--bw-capsule);
  font-family:var(--bw-font-head);font-weight:800;font-size:15px;letter-spacing:.02em;
  color:var(--bw-bone);background:transparent;white-space:nowrap;
  transition:transform .18s var(--bw-ease),box-shadow .18s var(--bw-ease),background .18s var(--bw-ease),color .18s var(--bw-ease),border-color .18s var(--bw-ease);
}
.bw-btn:hover{transform:translate(-2px,-2px);box-shadow:var(--bw-shadow-hard)}
.bw-btn:active{transform:translate(0,0);box-shadow:none}
.bw-btn--lime{background:var(--bw-lime);border-color:var(--bw-lime);color:var(--bw-ink)}
.bw-btn--lime:hover{box-shadow:var(--bw-shadow-clay)}
.bw-btn--clay{background:var(--bw-clay);border-color:var(--bw-clay);color:var(--bw-ink)}
.bw-btn--clay:hover{box-shadow:var(--bw-shadow-lime)}
.bw-btn--ghost{border-color:var(--bw-steel);color:var(--bw-bone);background:rgba(28,42,53,.5)}
.bw-btn--ghost:hover{border-color:var(--bw-lime);color:var(--bw-lime);box-shadow:var(--bw-shadow-hard)}

/* ---------- tags / pills ---------- */
.bw-tag,.bw-pill{
  display:inline-flex;align-items:center;gap:.45em;
  font-family:var(--bw-font-mono);font-size:11.5px;font-weight:700;
  letter-spacing:.14em;text-transform:uppercase;line-height:1;
  padding:7px 11px;border:2px solid var(--bw-neutral);border-radius:3px;
  color:var(--bw-neutral-light);background:rgba(14,17,22,.6);
}
.bw-tag{color:var(--bw-clay);border-color:rgba(255,92,58,.55)}
.bw-pill{border-radius:var(--bw-capsule);color:var(--bw-lime);border-color:rgba(157,255,60,.5)}

/* ---------- card ---------- */
.bw-card{
  position:relative;padding:clamp(18px,2.3vw,28px);
  border:var(--bw-line);border-radius:var(--bw-radius);
  background:linear-gradient(160deg,rgba(28,42,53,.72),rgba(14,17,22,.9));
  transition:transform .2s var(--bw-ease),border-color .2s var(--bw-ease),box-shadow .2s var(--bw-ease);
}
.bw-card:hover{transform:translateY(-4px);border-color:rgba(157,255,60,.7);box-shadow:var(--bw-shadow-hard)}

/* ---------- stat ---------- */
.bw-stat{display:flex;flex-direction:column;gap:6px}
.bw-stat__num{
  font-family:var(--bw-font-mono);font-weight:700;
  font-size:clamp(40px,7vw,96px);line-height:.9;letter-spacing:-.04em;color:var(--bw-lime);
}
.bw-stat__label{font-family:var(--bw-font-mono);font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--bw-neutral-light)}

/* ---------- media ---------- */
.bw-media{
  position:relative;overflow:hidden;display:block;
  aspect-ratio:16/9;border:var(--bw-line);border-radius:var(--bw-radius);
  background:
    repeating-linear-gradient(135deg,rgba(92,122,153,.12) 0 10px,rgba(92,122,153,0) 10px 20px),
    linear-gradient(150deg,var(--bw-surface),var(--bw-ink-deep));
}
.bw-media img{width:100%;height:100%;object-fit:cover}
.bw-media::after{
  content:"";position:absolute;inset:auto 0 0 0;height:58%;
  background:linear-gradient(180deg,transparent,rgba(8,10,13,.82));pointer-events:none;
}
.bw-media--wide{aspect-ratio:21/9}
.bw-media--tall{aspect-ratio:3/4}
.bw-media--square{aspect-ratio:1/1}
.bw-media__tag{
  position:absolute;left:14px;bottom:14px;z-index:2;
  font-family:var(--bw-font-mono);font-size:11.5px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;
  color:var(--bw-ink);background:var(--bw-lime);padding:6px 10px;border-radius:3px;
}

/* ---------- reveal ---------- */
.bw-reveal{opacity:0;transform:translateY(22px);transition:opacity .5s var(--bw-ease),transform .5s var(--bw-ease)}
.bw-reveal.is-visible{opacity:1;transform:none}

/* ---------- header ---------- */
.bw-header{position:fixed;top:0;left:0;right:0;z-index:90;padding-top:14px;pointer-events:none}
.bw-header__shell{max-width:1260px;margin-inline:auto;padding-inline:clamp(12px,3vw,28px);pointer-events:none}
.bw-capsule{
  position:relative;pointer-events:auto;
  display:flex;align-items:center;gap:clamp(10px,1.6vw,22px);
  padding:10px 12px 10px 18px;
  border:2px solid rgba(58,63,71,.95);border-radius:var(--bw-capsule);
  background:rgba(12,15,20,.84);
  backdrop-filter:blur(14px) saturate(150%);
  -webkit-backdrop-filter:blur(14px) saturate(150%);
  box-shadow:0 18px 44px rgba(0,0,0,.55),inset 0 0 0 1px rgba(242,239,230,.04);
  transition:padding .25s var(--bw-ease),border-color .25s var(--bw-ease),background .25s var(--bw-ease);
}
.bw-header[data-condensed] .bw-capsule{padding:6px 8px 6px 16px;border-color:rgba(157,255,60,.5);background:rgba(9,12,16,.95)}
.bw-header[data-condensed] .bw-brand__tagline{opacity:0;max-height:0}

/* progress */
.bw-progress{position:fixed;top:0;left:0;right:0;height:3px;background:rgba(58,63,71,.45);z-index:120;pointer-events:none}
.bw-progress__bar{display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:0 50%;background:linear-gradient(90deg,var(--bw-lime) 0 62%,var(--bw-clay) 62% 100%)}

/* brand */
.bw-brand{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.bw-brand__mark{
  position:relative;width:16px;height:16px;flex:0 0 auto;
  background:var(--bw-lime);transform:rotate(45deg);
  box-shadow:0 0 0 3px rgba(157,255,60,.16),0 0 18px rgba(157,255,60,.5);
  animation:bw-pulse 2.4s var(--bw-ease) infinite;
}
.bw-brand__mark::after{content:"";position:absolute;inset:5px;background:var(--bw-ink)}
@keyframes bw-pulse{0%,100%{box-shadow:0 0 0 3px rgba(157,255,60,.16),0 0 18px rgba(157,255,60,.45)}50%{box-shadow:0 0 0 6px rgba(157,255,60,.06),0 0 26px rgba(157,255,60,.7)}}
.bw-brand__text{display:flex;flex-direction:column;line-height:1.1}
.bw-brand__name{font-family:var(--bw-font-head);font-weight:900;font-size:18px;letter-spacing:.04em;color:var(--bw-bone)}
.bw-brand__tagline{
  font-family:var(--bw-font-mono);font-size:10.5px;letter-spacing:.18em;color:var(--bw-neutral-light);
  overflow:hidden;max-height:16px;transition:opacity .25s var(--bw-ease),max-height .25s var(--bw-ease);
}

/* nav */
.bw-nav{display:flex;align-items:center;gap:clamp(8px,1.4vw,18px);margin-left:auto}
.bw-nav__list{display:flex;align-items:center;gap:2px}
.bw-nav__link{
  display:inline-block;padding:9px 13px;border-radius:var(--bw-capsule);
  font-size:14px;letter-spacing:.04em;color:var(--bw-neutral-light);
  transition:color .18s var(--bw-ease),background .18s var(--bw-ease),transform .18s var(--bw-ease),box-shadow .18s var(--bw-ease);
}
.bw-nav__link:hover{color:var(--bw-bone);background:rgba(157,255,60,.1);transform:translateY(-1px)}
.bw-nav__link[aria-current="page"]{
  color:var(--bw-lime);background:rgba(157,255,60,.13);
  box-shadow:inset 0 0 0 2px rgba(157,255,60,.55);
}
.bw-nav__cta{padding:10px 20px;font-size:14px}

/* mobile toggle */
.bw-nav-toggle{
  display:none;align-items:center;gap:10px;margin-left:auto;
  padding:8px 14px 8px 12px;border:2px solid var(--bw-neutral);border-radius:var(--bw-capsule);
  background:rgba(14,17,22,.7);
}
.bw-nav-toggle__bars{display:flex;flex-direction:column;justify-content:center;gap:4px;width:20px;height:14px}
.bw-nav-toggle__bars i{display:block;height:2px;width:100%;background:var(--bw-lime);transition:transform .22s var(--bw-ease),opacity .22s var(--bw-ease)}
.bw-nav-toggle__label{font-family:var(--bw-font-mono);font-size:12px;letter-spacing:.14em;color:var(--bw-neutral-light)}
.bw-header[data-open] .bw-nav-toggle{border-color:var(--bw-clay)}
.bw-header[data-open] .bw-nav-toggle__bars i:nth-child(1){transform:translateY(6px) rotate(45deg);background:var(--bw-clay)}
.bw-header[data-open] .bw-nav-toggle__bars i:nth-child(2){opacity:0}
.bw-header[data-open] .bw-nav-toggle__bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg);background:var(--bw-clay)}

/* ---------- footer ---------- */
.bw-footer{
  position:relative;margin-top:clamp(48px,7vw,110px);
  border-top:2px solid var(--bw-neutral);
  background:linear-gradient(180deg,var(--bw-ink-deep),#0d1217 60%,#0a0d11);
}
.bw-footer::before{
  content:"";display:block;height:6px;
  background:linear-gradient(90deg,var(--bw-lime) 0 24%,var(--bw-clay) 24% 36%,var(--bw-steel) 36% 100%);
}
.bw-footer__inner{padding-block:clamp(38px,5vw,72px) clamp(20px,3vw,32px)}
.bw-footer__grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.35fr;gap:clamp(24px,3.4vw,54px)}
.bw-footer__brand{display:flex;flex-direction:column;gap:16px}
.bw-brand--footer .bw-brand__name{font-size:20px}
.bw-footer__lede{max-width:420px;font-size:14.5px;line-height:1.8;color:var(--bw-neutral-light)}
.bw-footer__badge{
  align-self:flex-start;font-family:var(--bw-font-mono);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--bw-lime);border:2px solid rgba(157,255,60,.45);border-radius:3px;padding:6px 10px;
}
.bw-footer__col{display:flex;flex-direction:column;gap:14px}
.bw-footer__title{
  font-family:var(--bw-font-mono);font-size:12px;font-weight:700;letter-spacing:.2em;text-transform:uppercase;
  color:var(--bw-steel);
}
.bw-footer__list{display:flex;flex-direction:column;gap:9px;font-size:14.5px}
.bw-footer__list a{color:rgba(242,239,230,.82);border-bottom:2px solid transparent;transition:color .18s var(--bw-ease),border-color .18s var(--bw-ease)}
.bw-footer__list a:hover{color:var(--bw-lime);border-bottom-color:var(--bw-lime)}
.bw-footer__contact{display:flex;flex-direction:column;gap:14px}
.bw-contact{display:flex;flex-direction:column;gap:12px}
.bw-contact__item{display:flex;flex-direction:column;gap:3px}
.bw-contact__label{font-family:var(--bw-font-mono);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--bw-steel)}
.bw-contact__value{
  font-family:var(--bw-font-mono);font-size:14px;letter-spacing:.02em;color:var(--bw-bone);
  border-bottom:2px dashed rgba(157,255,60,.42);padding-bottom:2px;text-align:left;word-break:break-all;
  transition:color .18s var(--bw-ease),border-color .18s var(--bw-ease);
}
.bw-contact__value:hover{color:var(--bw-lime);border-bottom-color:var(--bw-lime)}
.bw-contact__value--static{border-bottom-color:rgba(58,63,71,.9);cursor:default}
.bw-contact__value--static:hover{color:var(--bw-bone);border-bottom-color:rgba(58,63,71,.9)}
.bw-copy[data-copy-state]::after{
  content:attr(data-copy-state);margin-left:.7em;
  font-size:11px;letter-spacing:.14em;color:var(--bw-clay);
}
.bw-footer__note{font-size:12.5px;line-height:1.7;color:var(--bw-neutral-light);max-width:360px}
.bw-footer__meta{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;
  margin-top:clamp(28px,4vw,54px);padding-top:20px;border-top:2px solid rgba(58,63,71,.8);
  font-family:var(--bw-font-mono);font-size:12px;letter-spacing:.08em;color:var(--bw-neutral-light);
}
.bw-footer__icp{color:var(--bw-clay)}

/* back to top */
.bw-backtop{
  position:fixed;right:clamp(14px,2.4vw,28px);bottom:clamp(14px,2.4vw,28px);z-index:95;
  width:50px;height:50px;display:grid;place-items:center;
  border:2px solid var(--bw-lime);border-radius:var(--bw-radius);
  background:rgba(12,15,20,.92);color:var(--bw-lime);
  font-family:var(--bw-font-mono);font-size:20px;line-height:1;
  opacity:0;visibility:hidden;transform:translateY(12px);
  transition:opacity .22s var(--bw-ease),transform .22s var(--bw-ease),background .22s var(--bw-ease),color .22s var(--bw-ease),visibility .22s;
}
.bw-backtop.is-visible{opacity:1;visibility:visible;transform:none}
.bw-backtop:hover{background:var(--bw-lime);color:var(--bw-ink);box-shadow:var(--bw-shadow-clay)}

/* ---------- toc ---------- */
.bw-toc{
  display:flex;flex-direction:column;gap:6px;
  padding:16px;border:var(--bw-line);border-radius:var(--bw-radius);
  background:rgba(14,17,22,.72);
}
.bw-toc__link{
  display:flex;align-items:baseline;gap:10px;
  padding:8px 10px;border-radius:3px;
  font-family:var(--bw-font-mono);font-size:12.5px;letter-spacing:.06em;color:var(--bw-neutral-light);
  border-left:3px solid transparent;
  transition:color .18s var(--bw-ease),background .18s var(--bw-ease),border-color .18s var(--bw-ease);
}
.bw-toc__link:hover{color:var(--bw-bone);background:rgba(92,122,153,.16)}
.bw-toc__link.is-active,.bw-toc__link[aria-current]{color:var(--bw-lime);border-left-color:var(--bw-lime);background:rgba(157,255,60,.08)}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .bw-footer__grid{grid-template-columns:1fr 1fr;row-gap:38px}
  .bw-grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  :root{--bw-header-h:84px}
  html{scroll-padding-top:104px}
  .bw-nav-toggle{display:inline-flex}
  .bw-brand__tagline{display:none}
  .bw-nav{
    position:absolute;left:0;right:0;top:calc(100% + 12px);
    flex-direction:column;align-items:stretch;gap:12px;margin-left:0;
    padding:16px;border:2px solid rgba(58,63,71,.95);border-radius:20px;
    background:rgba(9,12,16,.97);box-shadow:var(--bw-shadow-deep);
    display:none;
  }
  .bw-header[data-open] .bw-nav{display:flex}
  .bw-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .bw-nav__link{
    display:block;width:100%;padding:13px 10px;font-size:15.5px;border-radius:3px;
    border-bottom:1px dashed rgba(58,63,71,.9);
  }
  .bw-nav__link:last-child{border-bottom:0}
  .bw-nav__cta{width:100%}
  .bw-grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:640px){
  .bw-capsule{padding:8px 10px 8px 14px}
  .bw-brand__name{font-size:16px}
  .bw-footer__grid{grid-template-columns:1fr}
  .bw-grid--2,.bw-grid--3,.bw-grid--4{grid-template-columns:1fr}
  .bw-footer__meta{flex-direction:column;align-items:flex-start}
  .bw-chapter__index{font-size:clamp(46px,16vw,84px)}
}

/* ---------- motion preferences ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .bw-reveal{opacity:1;transform:none}
}