/* ============================================================
   亚愽体育 · tower-yabo.com.cn
   共享样式 /assets/site.css
   夜航塔台：深钴结构区 + 冷雾阅读区 + 霓虹青数据 + 信号橙行动
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
h1,h2,h3,h4{font-weight:700;line-height:1.15;letter-spacing:-.005em}

/* ---------- 2. Tokens ---------- */
:root{
  --navy:#0A1730;
  --cobalt:#12294F;
  --struct:#1E3C74;
  --mist:#EDF1F7;
  --steel:#6B7A93;
  --cyan:#33E1D2;
  --signal:#FF6A2B;
  --near-white:#F7FAFF;
  --ink:#0F1725;

  --line-dark:rgba(247,250,255,.10);
  --line-light:rgba(15,23,37,.10);
  --cyan-soft:rgba(51,225,210,.12);
  --signal-soft:rgba(255,106,43,.14);

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

  --shell:1180px;
  --gutter:clamp(18px,4.4vw,44px);
  --r-lg:26px;
  --r-md:18px;
  --r-sm:12px;
  --r-pill:999px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow:0 22px 46px -34px rgba(10,23,48,.55);
}

/* ---------- 3. Base ---------- */
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--ink);
  background:var(--mist);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}
::selection{background:var(--cyan);color:var(--navy)}
.skip-link{
  position:fixed;left:50%;top:-72px;transform:translateX(-50%);
  z-index:120;background:var(--cyan);color:var(--navy);
  font-size:14px;font-weight:600;padding:11px 22px;
  border-radius:0 0 var(--r-pill) var(--r-pill);
  transition:top .22s var(--ease);
}
.skip-link:focus{top:0}

/* ---------- 4. Layout ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(52px,8vw,104px)}
.section--dark{background:var(--navy);color:var(--near-white)}
.section--cobalt{background:linear-gradient(180deg,var(--navy) 0%,var(--cobalt) 100%);color:var(--near-white)}
.section--light{background:var(--mist);color:var(--ink)}
.section--light + .section--light{border-top:1px solid var(--line-light)}

.grid-bento{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(14px,2vw,22px)}
.grid-bento > *{grid-column:span 12}
.grid-2,.grid-3{display:grid;gap:clamp(14px,2.4vw,26px);grid-template-columns:minmax(0,1fr)}
@media (min-width:700px){.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:900px){.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (min-width:760px){
  .grid-bento > .span-4{grid-column:span 4}
  .grid-bento > .span-5{grid-column:span 5}
  .grid-bento > .span-6{grid-column:span 6}
  .grid-bento > .span-7{grid-column:span 7}
  .grid-bento > .span-8{grid-column:span 8}
  .grid-bento > .span-12{grid-column:span 12}
}

.rail-layout{display:grid;grid-template-columns:minmax(0,1fr);gap:clamp(18px,3vw,42px)}
@media (min-width:900px){.rail-layout{grid-template-columns:62px minmax(0,1fr)}}
.tick-rail{display:none}
@media (min-width:900px){
  .tick-rail{
    position:sticky;top:132px;align-self:start;display:flex;
    flex-direction:column;gap:16px;padding-block:6px;
  }
}
.tick-rail__item{
  display:flex;align-items:center;gap:9px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:var(--steel);transition:color .25s var(--ease);
}
.tick-rail__item::before{
  content:"";width:16px;height:2px;border-radius:2px;
  background:var(--struct);transition:width .25s var(--ease),background-color .25s var(--ease);
}
.tick-rail__item.is-active{color:var(--cyan)}
.tick-rail__item.is-active::before{width:30px;background:var(--cyan)}
.tick-rail__no{font-family:var(--font-mono);font-size:11px}
.section--light .tick-rail__item.is-active{color:var(--struct)}
.section--light .tick-rail__item.is-active::before{background:var(--struct)}

/* ---------- 5. Typography ---------- */
.eyebrow{
  display:inline-block;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.22em;text-transform:uppercase;color:var(--cyan);
}
.display-1{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(34px,7.6vw,68px);line-height:1.02;letter-spacing:-.015em;
}
.display-2{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(26px,4.6vw,44px);line-height:1.08;letter-spacing:-.01em;
}
.chapter{margin-bottom:clamp(20px,3vw,34px)}
.chapter__no{
  display:block;font-family:var(--font-mono);font-weight:700;
  font-size:clamp(52px,10vw,112px);line-height:.86;letter-spacing:-.05em;
  color:var(--cyan);
}
.chapter__title{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(24px,3.6vw,38px);line-height:1.1;letter-spacing:-.01em;
  margin-top:6px;
}
.section--light .chapter__no{color:rgba(30,60,116,.28)}
.lede{font-size:clamp(15px,1.9vw,18px);line-height:1.85;max-width:38em}
.prose{max-width:36em}
.prose p + p{margin-top:1em}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em}

/* ---------- 6. Components ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:var(--r-pill);
  font-size:15px;font-weight:600;letter-spacing:.02em;
  border:1px solid transparent;white-space:nowrap;
  transition:transform .2s var(--ease),background-color .2s var(--ease),
             color .2s var(--ease),border-color .2s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--signal{background:var(--signal);color:#fff;box-shadow:0 12px 26px -16px rgba(255,106,43,.9)}
.btn--signal:hover{background:#ff8151}
.btn--cyan{background:var(--cyan);color:var(--navy)}
.btn--cyan:hover{background:#5cf0e2}
.btn--ghost{background:transparent;border-color:rgba(247,250,255,.28);color:var(--near-white)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.section--light .btn--ghost{border-color:rgba(15,23,37,.22);color:var(--ink)}
.section--light .btn--ghost:hover{border-color:var(--struct);color:var(--struct)}

.pill{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 14px;border-radius:var(--r-pill);
  background:var(--cyan-soft);color:var(--cyan);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
}
.tag-row{display:flex;flex-wrap:wrap;gap:8px}
.section--light .pill{background:rgba(30,60,116,.10);color:var(--struct)}

.card{
  background:var(--near-white);color:var(--ink);
  border:1px solid var(--line-light);border-radius:var(--r-lg);
  padding:clamp(20px,3vw,30px);box-shadow:var(--shadow);
}
.card__title{font-family:var(--font-display);font-weight:700;font-size:clamp(19px,2.4vw,24px);line-height:1.25}
.card__meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--steel);margin-top:8px}
.card--tall{min-height:clamp(220px,26vw,320px);display:flex;flex-direction:column;gap:12px;justify-content:flex-end}
.card--wide{display:flex;flex-direction:column;gap:14px}
.section--dark .card,.section--cobalt .card{
  background:var(--cobalt);color:var(--near-white);border-color:var(--line-dark);
}
.section--dark .card__meta,.section--cobalt .card__meta{color:rgba(247,250,255,.6)}

.stat{display:flex;flex-direction:column;gap:6px}
.stat__value{
  font-family:var(--font-mono);font-weight:700;font-variant-numeric:tabular-nums;
  font-size:clamp(30px,5vw,46px);line-height:1;letter-spacing:-.03em;color:var(--cyan);
}
.stat__label{font-size:13px;letter-spacing:.04em;color:var(--steel)}
.section--light .stat__value{color:var(--struct)}

.media-frame{
  position:relative;overflow:hidden;border-radius:var(--r-lg);
  background:linear-gradient(150deg,var(--cobalt),var(--navy));
  aspect-ratio:4/3;isolation:isolate;
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(10,23,48,0) 52%,rgba(10,23,48,.5) 100%);
}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--wide{aspect-ratio:16/9}

.breadcrumbs{
  display:flex;flex-wrap:wrap;gap:8px;padding-block:18px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--steel);
}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li::after{content:"/";color:var(--struct)}
.breadcrumbs li:last-child::after{content:""}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs [aria-current="page"]{color:var(--near-white)}
.section--light .breadcrumbs [aria-current="page"]{color:var(--ink)}

.filter-bar{
  display:flex;flex-wrap:wrap;gap:10px;
  padding:10px;border-radius:var(--r-pill);
  background:rgba(247,250,255,.06);border:1px solid var(--line-dark);
}
.filter-chip{
  padding:9px 16px;border-radius:var(--r-pill);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:rgba(247,250,255,.72);border:1px solid transparent;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.filter-chip:hover{border-color:rgba(51,225,210,.5);color:var(--cyan)}
.filter-chip.is-active{background:var(--cyan);color:var(--navy);font-weight:600}
.section--light .filter-bar{background:#fff;border-color:var(--line-light)}
.section--light .filter-chip{color:var(--steel)}
.section--light .filter-chip:hover{border-color:var(--struct);color:var(--struct)}
.section--light .filter-chip.is-active{background:var(--navy);color:var(--near-white)}

.progress-rail{position:fixed;left:0;right:0;top:0;height:3px;z-index:80;pointer-events:none}
.progress-rail__bar{
  height:100%;width:0;
  background:linear-gradient(90deg,var(--cyan),var(--signal));
  transition:width .12s linear;
}

/* ---------- 7. Header ---------- */
.tower-header{
  position:sticky;top:0;z-index:70;
  color:var(--near-white);
  background:linear-gradient(180deg,var(--navy) 0%,rgba(10,23,48,.95) 100%);
  border-bottom:1px solid var(--line-dark);
  backdrop-filter:blur(10px);
}
.tower-header__inner{padding-block:clamp(12px,2vw,20px);transition:padding .24s var(--ease)}
.tower-header.is-condensed .tower-header__inner{padding-block:8px}
.masthead{
  display:grid;grid-template-columns:1fr auto 1fr;
  align-items:center;gap:clamp(12px,2vw,24px);
}
.masthead__glyph{justify-self:start;display:flex;align-items:flex-end;gap:4px;height:34px}
.masthead__bar{display:block;width:4px;border-radius:2px;background:var(--struct)}
.masthead__bar:nth-child(1){height:12px;background:rgba(51,225,210,.35)}
.masthead__bar:nth-child(2){height:19px;background:rgba(51,225,210,.55)}
.masthead__bar:nth-child(3){height:26px;background:rgba(51,225,210,.8)}
.masthead__bar:nth-child(4){height:32px;background:var(--signal)}
.masthead__brand{justify-self:center;display:flex;flex-direction:column;align-items:center;gap:5px;text-align:center}
.masthead__name{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(24px,3.4vw,34px);line-height:1;letter-spacing:.08em;
}
.masthead__tagline{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;
  color:var(--cyan);text-transform:uppercase;
}
.masthead__actions{justify-self:end;display:flex;align-items:center;gap:10px}
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:10px 15px;border-radius:var(--r-pill);
  border:1px solid rgba(247,250,255,.22);
  font-size:13px;letter-spacing:.06em;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:2px;border-radius:2px;background:currentColor}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;border-radius:2px;background:currentColor;
  transition:transform .24s var(--ease),top .24s var(--ease);
}
.nav-toggle__bars::before{top:-5px}
.nav-toggle__bars::after{top:5px}
.tower-header[data-open] .nav-toggle__bars{background:transparent}
.tower-header[data-open] .nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.tower-header[data-open] .nav-toggle__bars::after{top:0;transform:rotate(-45deg)}
.primary-nav{margin-top:clamp(10px,1.6vw,16px);padding-top:10px;border-top:1px solid var(--line-dark)}
.primary-nav__list{display:flex;flex-wrap:wrap;justify-content:center;gap:clamp(4px,1.4vw,10px)}
.primary-nav__link{
  display:inline-block;padding:8px 15px;border-radius:var(--r-pill);
  font-size:15px;color:rgba(247,250,255,.78);
  transition:color .2s var(--ease),background-color .2s var(--ease);
}
.primary-nav__link:hover{color:var(--near-white);background:var(--cyan-soft)}
.primary-nav__link[aria-current="page"]{background:var(--cyan);color:var(--navy);font-weight:600}

/* ---------- 8. Footer ---------- */
.tower-footer{
  position:relative;background:var(--navy);color:rgba(247,250,255,.72);
  padding-block:clamp(40px,6vw,72px) 26px;
}
.tower-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--cyan),transparent);opacity:.55;
}
.tower-footer__inner{display:grid;gap:clamp(28px,4vw,48px);grid-template-columns:minmax(0,1fr)}
@media (min-width:880px){
  .tower-footer__inner{grid-template-columns:minmax(0,.9fr) minmax(0,1.6fr)}
}
.tower-footer__brand{display:flex;flex-direction:column;gap:8px}
.tower-footer__name{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(26px,3vw,34px);letter-spacing:.08em;color:var(--near-white);
}
.tower-footer__tagline{font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;color:var(--cyan)}
.tower-footer__note{font-size:13px;line-height:1.75;color:var(--steel);max-width:28em}
.tower-footer__cols{display:grid;gap:clamp(22px,3vw,36px);grid-template-columns:minmax(0,1fr)}
@media (min-width:620px){.tower-footer__cols{grid-template-columns:repeat(3,minmax(0,1fr))}}
.footer-col__title{
  font-family:var(--font-mono);font-size:12px;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;color:var(--near-white);margin-bottom:14px;
}
.footer-col__list{display:flex;flex-direction:column;gap:9px}
.footer-col__list a{font-size:15px;color:rgba(247,250,255,.72);transition:color .2s var(--ease)}
.footer-col__list a:hover{color:var(--cyan)}
.footer-contact__list{display:flex;flex-direction:column;gap:10px}
.footer-contact__row{display:flex;gap:10px;align-items:baseline;font-size:14px}
.footer-contact__key{
  flex:none;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--steel);
}
.footer-contact__val{color:rgba(247,250,255,.82);word-break:break-all}
.tower-footer__legal{
  grid-column:1/-1;margin-top:clamp(18px,3vw,30px);padding-top:18px;
  border-top:1px solid var(--line-dark);
  display:flex;flex-wrap:wrap;gap:10px 20px;justify-content:space-between;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--steel);
}

/* ---------- 9. Motion ---------- */
.js-reveal [data-reveal]{opacity:0;transform:translateY(16px)}
.js-reveal [data-reveal].is-revealed{
  opacity:1;transform:translateY(0);
  transition:opacity .3s var(--ease),transform .3s var(--ease);
}
@keyframes navIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}

/* ---------- 10. Responsive ---------- */
@media (max-width:880px){
  .masthead{grid-template-columns:minmax(0,1fr) auto;gap:12px}
  .masthead__glyph{display:none}
  .masthead__brand{justify-self:start;align-items:flex-start;text-align:left}
  .masthead__actions{justify-self:end}
  .masthead__actions .btn{padding:9px 15px;font-size:13px}
  .nav-toggle{display:inline-flex}
  .primary-nav{display:none}
  .tower-header[data-open] .primary-nav{display:block;animation:navIn .26s var(--ease)}
  .primary-nav__list{flex-direction:column;gap:4px;justify-content:flex-start}
  .primary-nav__link{
    display:block;padding:12px 15px;border-radius:14px;
    background:rgba(247,250,255,.05);font-size:16px;
  }
  .primary-nav__link[aria-current="page"]{background:var(--cyan);color:var(--navy)}
}
@media (max-width:520px){
  .masthead__actions .btn{padding:8px 12px;font-size:12px}
  .nav-toggle__label{display:none}
  .nav-toggle{padding:10px 13px}
}

/* ---------- 11. Reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js-reveal [data-reveal]{opacity:1;transform:none}
  .js-reveal [data-reveal].is-revealed{transition:none}
  .progress-rail__bar{transition:none}
  .tower-header,.tower-header__inner,.btn,.primary-nav__link,.nav-toggle,
  .nav-toggle__bars::before,.nav-toggle__bars::after,.tick-rail__item::before{
    transition:none;
  }
  .tower-header[data-open] .primary-nav{animation:none}
  .btn:hover{transform:none}
}