/* ============================================================
   YABO赛事 · 共享样式表 /assets/site.css
   深空蓝连续画布 + 居中刊头导航 + 夜幕墨蓝页脚
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --c-deep:#0A1030;
  --c-night:#050A1E;
  --c-cabin:#131C44;
  --c-cyan:#2FF0D0;
  --c-cyan-soft:rgba(47,240,208,.16);
  --c-orange:#FF7A2E;
  --c-green:#46E08A;
  --c-violet:#8A7BFF;
  --c-text:#EAF0FF;
  --c-muted:#94A4C6;
  --c-line:#22305C;
  --c-line-soft:rgba(34,48,92,.6);
  --shell:1240px;
  --gutter:clamp(20px,5vw,56px);
  --radius:3px;
  --ease:ease-out;
  --mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}

/* ---------- 2. Reset & 基础 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{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}
button{background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

html,body{background:var(--c-deep)}
body{
  font-family:var(--sans);
  font-size:17px;
  line-height:1.9;
  font-weight:400;
  color:var(--c-text);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

::selection{background:var(--c-cyan);color:#04121A}

:focus-visible{
  outline:2px solid var(--c-cyan);
  outline-offset:3px;
  border-radius:2px;
}

.skip-link{
  position:absolute;left:-9999px;top:0;z-index:220;
  padding:12px 20px;background:var(--c-cyan);color:#04121A;
  font-weight:700;font-size:15px;border-radius:0 0 var(--radius) 0;
}
.skip-link:focus{left:0;top:0}

/* ---------- 3. 排版 ---------- */
h1,h2,h3,h4{font-weight:900;letter-spacing:-.02em;line-height:1.16;color:var(--c-text)}
.display-1{font-size:clamp(34px,6.4vw,72px);line-height:1.06;letter-spacing:-.03em}
.display-2{font-size:clamp(26px,3.6vw,40px);line-height:1.16}
.display-3{font-size:clamp(20px,2.4vw,26px);line-height:1.3}
.mono,[data-mono]{font-family:var(--mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}
.lead{font-size:clamp(17px,1.8vw,20px);line-height:1.85;color:var(--c-text);font-weight:400}
.small{font-size:14px;line-height:1.75;color:var(--c-muted)}
.muted{color:var(--c-muted)}
.link-cyan{color:var(--c-cyan);transition:color .18s var(--ease)}
.link-cyan:hover{color:#7CF7E4}

.prose{max-width:42em;font-size:17px;line-height:1.9}
.prose > * + *{margin-top:1.05em}
.prose h2{font-size:clamp(22px,2.6vw,30px);margin-top:2em}
.prose h3{font-size:clamp(18px,2vw,22px);margin-top:1.6em}
.prose strong{font-weight:700;color:#fff}
.prose ul,.prose ol{display:grid;gap:.5em;padding-left:0}
.prose ul > li{position:relative;padding-left:1.4em}
.prose ul > li::before{
  content:"";position:absolute;left:0;top:.85em;
  width:8px;height:2px;background:var(--c-cyan);
}
.prose ol{counter-reset:prose;list-style:none}
.prose ol > li{position:relative;padding-left:2.4em;counter-increment:prose}
.prose ol > li::before{
  content:counter(prose,decimal-leading-zero);
  position:absolute;left:0;top:.1em;
  font-family:var(--mono);font-size:13px;color:var(--c-cyan);
}
.prose blockquote{
  border-left:2px solid var(--c-orange);
  padding-left:1.2em;color:var(--c-muted);
}
.rule-accent{display:inline-block;width:2px;height:1em;background:var(--c-orange);vertical-align:-.12em;margin-right:.6em}

/* ---------- 4. 布局骨架 ---------- */
.shell{
  width:min(100% - var(--gutter) * 2, var(--shell));
  margin-inline:auto;
}
.section{padding-block:clamp(56px,8vw,112px)}
.section--tight{padding-block:clamp(36px,5vw,64px)}
.section--deep{background:var(--c-deep)}
.section--cabin{background:var(--c-cabin)}
.section--night{background:var(--c-night)}

.band{
  height:1px;border:0;
  background:linear-gradient(90deg,var(--c-cyan),var(--c-line) 38%,transparent);
  margin-block:clamp(24px,4vw,48px);
}

.chapter-tag{
  display:inline-flex;align-items:center;gap:12px;
  font-family:var(--mono);font-size:12px;letter-spacing:.2em;
  color:var(--c-cyan);text-transform:uppercase;
}
.chapter-tag::before{
  content:"";display:block;width:34px;height:2px;
  background:var(--c-cyan);
  transition:width .28s var(--ease),background-color .28s var(--ease);
}
[data-chapter].is-current .chapter-tag::before{width:64px;background:var(--c-orange)}

.grid{display:grid;gap:clamp(20px,3vw,36px)}
.grid--5-7{grid-template-columns:5fr 7fr}
.grid--4-8{grid-template-columns:4fr 8fr}
.grid--3-9{grid-template-columns:3fr 9fr}
.grid--halves{grid-template-columns:1fr 1fr}

/* ---------- 5. 顶部进度条 ---------- */
.progress-rail{
  position:fixed;top:0;left:0;right:0;height:2px;
  background:var(--c-night);z-index:200;
}
.progress-rail__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--c-cyan) 0%,#7CF7E4 55%,var(--c-orange) 100%);
  will-change:transform;
}

/* ---------- 6. 顶部刊头 + 居中导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:150;
  background:rgba(10,16,48,.94);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--c-line);
}

.masthead{border-bottom:1px solid var(--c-line)}
.masthead__inner{
  position:relative;
  width:min(100% - var(--gutter) * 2, var(--shell));
  margin-inline:auto;
  display:flex;align-items:center;justify-content:center;
  padding:16px 0 14px;
}
.masthead__motto{
  position:absolute;left:0;top:50%;transform:translateY(-50%);
  font-family:var(--mono);font-size:11px;letter-spacing:.2em;
  color:var(--c-muted);opacity:.72;white-space:nowrap;
}

.brand-lockup{
  display:inline-flex;align-items:center;gap:14px;
  color:var(--c-text);
}
.brand-lockup__mark{
  display:grid;place-items:center;
  width:40px;height:40px;flex:0 0 auto;
  border:1px solid var(--c-cyan);color:var(--c-cyan);
  font-family:var(--mono);font-size:14px;font-weight:700;letter-spacing:.06em;
  background:linear-gradient(135deg,rgba(47,240,208,.12),transparent 70%);
  transition:background-color .18s var(--ease);
}
.brand-lockup:hover .brand-lockup__mark{background-color:var(--c-cyan-soft)}
.brand-lockup__text{display:flex;flex-direction:column;gap:2px;text-align:left}
.brand-lockup__name{font-size:20px;font-weight:900;letter-spacing:-.01em;line-height:1.2}
.brand-lockup__tagline{
  font-family:var(--mono);font-size:11px;letter-spacing:.14em;
  color:var(--c-muted);line-height:1.4;
}

.nav-bar{
  position:relative;
  border-top:1px solid var(--c-line);
  background:linear-gradient(180deg,rgba(19,28,68,.55),rgba(5,10,30,.35));
}
.nav-bar__inner{
  position:relative;
  width:min(100% - var(--gutter) * 2, var(--shell));
  margin-inline:auto;
  display:flex;align-items:center;justify-content:center;
  min-height:58px;
}
.nav-bar__chapter{
  position:absolute;left:0;top:50%;transform:translateY(-50%);
  margin:0;font-size:11px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--c-muted);opacity:.62;white-space:nowrap;
}

.nav{
  position:relative;width:100%;
  display:flex;align-items:center;justify-content:center;
}
.nav__list{display:flex;align-items:center;gap:2px}
.nav__link{
  position:relative;display:block;
  padding:12px 15px;font-size:15px;
  color:var(--c-muted);
  transition:color .18s var(--ease);
}
.nav__link:hover{color:var(--c-text)}
.nav__link[aria-current="page"]{color:var(--c-text);font-weight:500}
.nav__link[aria-current="page"]::after{
  content:"";position:absolute;left:15px;right:15px;bottom:8px;
  height:2px;background:var(--c-cyan);border-radius:1px;
}

.nav__cta{
  position:absolute;right:0;top:50%;transform:translateY(-50%);
  display:inline-flex;align-items:center;
  padding:10px 18px;
  background:var(--c-cyan);color:#04121A;
  font-size:14px;font-weight:700;line-height:1;white-space:nowrap;
  border-radius:var(--radius);
  transition:background-color .18s var(--ease),transform .18s var(--ease);
}
.nav__cta:hover{background:#62F4DE;transform:translateY(calc(-50% - 1px))}

.nav-toggle{
  position:absolute;left:0;top:50%;transform:translateY(-50%);
  display:none;align-items:center;gap:10px;
  padding:9px 13px;
  border:1px solid var(--c-line);border-radius:var(--radius);
  color:var(--c-text);font-size:13px;letter-spacing:.1em;
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--c-cyan);color:var(--c-cyan)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bars i{
  display:block;height:1.5px;background:currentColor;
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(4.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-4.5px) rotate(-45deg)}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  background:var(--c-night);
  border-top:1px solid var(--c-cyan);
  color:var(--c-muted);
  margin-top:clamp(48px,7vw,96px);
}
.footer__inner{
  width:min(100% - var(--gutter) * 2, var(--shell));
  margin-inline:auto;
  padding-block:clamp(40px,5vw,64px) clamp(24px,3vw,36px);
}
.footer__lead{
  display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;
  gap:12px 32px;
  padding-bottom:24px;
  border-bottom:1px solid var(--c-line-soft);
}
.footer__brand{
  font-size:clamp(18px,2.2vw,24px);font-weight:900;
  letter-spacing:-.02em;color:var(--c-text);
}
.footer__sub{font-size:14px;line-height:1.8;color:var(--c-muted);max-width:46em}

.footer__grid{
  display:grid;
  grid-template-columns:1fr 1fr 2.1fr;
  gap:clamp(24px,4vw,48px);
  padding-block:clamp(28px,4vw,44px);
}
.footer__title{
  font-family:var(--mono);font-size:11px;font-weight:500;
  letter-spacing:.22em;text-transform:uppercase;
  color:var(--c-cyan);margin-bottom:14px;
}
.footer__list{display:grid;gap:9px}
.footer__list--plain{font-size:14px;line-height:1.85;gap:6px}
.footer__link{
  display:inline-block;font-size:15px;color:var(--c-muted);
  transition:color .18s var(--ease);
}
.footer__link:hover{color:var(--c-cyan)}

.footer__bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 28px;
  padding-top:22px;
  border-top:1px solid var(--c-line);
}
.footer__legal{display:flex;flex-wrap:wrap;gap:8px 22px}
.footer__meta{font-size:12px;letter-spacing:.08em;color:var(--c-muted);opacity:.8}

/* ---------- 8. 基础组件 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 24px;font-size:15px;font-weight:700;line-height:1;
  border:1px solid transparent;border-radius:var(--radius);
  transition:background-color .18s var(--ease),color .18s var(--ease),
             border-color .18s var(--ease),transform .18s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--primary{background:var(--c-cyan);color:#04121A}
.btn--primary:hover{background:#62F4DE}
.btn--signal{background:var(--c-orange);color:#180A00}
.btn--signal:hover{background:#FF9152}
.btn--ghost{border-color:var(--c-line);color:var(--c-text);background:transparent}
.btn--ghost:hover{border-color:var(--c-cyan);color:var(--c-cyan)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;border:1px solid var(--c-line);border-radius:2px;
  font-family:var(--mono);font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--c-muted);line-height:1.5;
}
.tag--live{color:var(--c-orange);border-color:rgba(255,122,46,.45)}
.tag--sync{color:var(--c-green);border-color:rgba(70,224,138,.4)}
.tag--fav{color:var(--c-violet);border-color:rgba(138,123,255,.4)}

.breadcrumb{margin-bottom:18px}
.breadcrumb ol,.breadcrumb ul{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb li{
  display:flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:12px;letter-spacing:.12em;
  color:var(--c-muted);
}
.breadcrumb li + li::before{content:"/";color:var(--c-line)}
.breadcrumb a{color:var(--c-muted);transition:color .18s var(--ease)}
.breadcrumb a:hover{color:var(--c-cyan)}

.panel{
  background:var(--c-cabin);
  border:1px solid var(--c-line);
  border-radius:var(--radius);
  padding:clamp(18px,2.4vw,28px);
  box-shadow:0 18px 40px -34px rgba(0,0,0,.95);
}

.stat{display:grid;gap:6px}
.stat__value{
  font-family:var(--mono);font-weight:700;
  font-size:clamp(28px,4vw,44px);line-height:1.05;
  letter-spacing:-.02em;color:var(--c-cyan);
}
.stat__label{font-size:13px;line-height:1.7;color:var(--c-muted)}

.media-frame{
  position:relative;overflow:hidden;
  aspect-ratio:16/9;
  background:linear-gradient(135deg,var(--c-cabin),#0D1538 58%,var(--c-deep));
  border:1px solid var(--c-line);
  border-radius:var(--radius);
}
.media-frame__img{
  width:100%;height:100%;object-fit:cover;
  background:linear-gradient(135deg,#131C44,#0D1538 58%,#0A1030);
}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:12px 14px;
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;
  color:var(--c-muted);
  background:linear-gradient(180deg,transparent,rgba(5,10,30,.88));
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}

/* ---------- 9. 滚动显现 ---------- */
.js-reveal [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .24s var(--ease),transform .24s var(--ease);
}
.js-reveal [data-reveal].is-visible{opacity:1;transform:translateY(0)}

/* ---------- 10. 响应式 ---------- */
@media (max-width:1080px){
  .nav-bar__chapter{display:none}
  .nav__link{padding:12px 11px;font-size:14px}
  .nav__link[aria-current="page"]::after{left:11px;right:11px}
}

@media (max-width:980px){
  .grid--5-7,.grid--4-8,.grid--3-9,.grid--halves{grid-template-columns:1fr}
  .footer__grid{grid-template-columns:1fr 1fr}
  .footer__col--wide{grid-column:1 / -1}
}

@media (max-width:900px){
  .masthead__motto{display:none}
  .masthead__inner{padding:14px 0 12px}
  .nav-toggle{display:inline-flex}
  .nav{
    position:absolute;top:100%;left:50%;width:100vw;
    transform:translateX(-50%) translateY(-10px);
    flex-direction:column;align-items:stretch;justify-content:flex-start;
    background:var(--c-night);
    border-top:1px solid var(--c-line);
    border-bottom:1px solid var(--c-cyan);
    box-shadow:0 30px 50px -30px rgba(0,0,0,.9);
    padding:8px 0 18px;
    opacity:0;visibility:hidden;pointer-events:none;
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s;
  }
  .nav[data-open]{
    opacity:1;visibility:visible;pointer-events:auto;
    transform:translateX(-50%) translateY(0);
  }
  .nav__list{flex-direction:column;align-items:stretch;gap:0;width:100%}
  .nav__item{border-bottom:1px solid var(--c-line-soft)}
  .nav__item:last-child{border-bottom:0}
  .nav__link{padding:15px var(--gutter);font-size:16px}
  .nav__link[aria-current="page"]::after{
    left:var(--gutter);right:auto;width:22px;bottom:15px;
  }
  .nav__cta{
    position:static;transform:none;
    margin:18px var(--gutter) 0;
    justify-content:center;padding:14px 20px;
  }
  .nav__cta:hover{transform:none}
}

@media (max-width:640px){
  body{font-size:16px;line-height:1.85}
  .nav-bar__inner{min-height:54px}
  .brand-lockup__mark{width:34px;height:34px;font-size:12px}
  .brand-lockup__name{font-size:17px}
  .brand-lockup__tagline{font-size:10px;letter-spacing:.1em}
  .footer__grid{grid-template-columns:1fr;gap:28px}
  .footer__lead{flex-direction:column;align-items:flex-start}
  .footer__bottom{flex-direction:column;align-items:flex-start;gap:10px}
  .btn{width:100%}
}

/* ---------- 11. 降低动态效果 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js-reveal [data-reveal]{opacity:1;transform:none}
  .progress-rail__bar{transition:none}
}