/* =========================================================
   英皇电竞 · /assets/site.css
   共享外壳：侧轨导航 / 抽屉 / 页脚 / 基础组件
   ========================================================= */

/* ---------- 1. Tokens ---------- */
:root{
  --ink:#06101D;
  --ink-2:#0D1A2B;
  --char:#151C26;
  --slate:#1E2A38;
  --flame:#FF5A2F;
  --ember:#FF8A3D;
  --cyan:#2DE2F0;
  --cyan-soft:#8CF4FF;
  --gold:#E8C87A;
  --text:#F5F7FA;
  --sub:#AEBCCB;
  --weak:#6B7A8C;

  --font-serif:"Source Han Serif SC","Noto Serif SC","Songti SC",Georgia,"Times New Roman",serif;
  --font-sans:"HarmonyOS Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --rail-w:96px;
  --rail-open:252px;
  --rail-bar-h:64px;
  --gutter:clamp(18px,4vw,56px);
  --maxw:1440px;

  --r-lg:28px;
  --r-md:18px;
  --r-sm:12px;
  --r-pill:999px;

  --line-cyan:rgba(140,244,255,.14);
  --line-soft:rgba(174,188,203,.16);
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-1:0 18px 44px -30px rgba(0,0,0,.95);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
img{height:auto}
button{font:inherit;color:inherit;background:none;border:0;padding:0}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
}

/* ---------- 3. Base typography ---------- */
body{
  min-height:100vh;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background-color:var(--ink);
  background-image:
    radial-gradient(900px 520px at 6% -10%, rgba(255,90,47,.20), transparent 62%),
    radial-gradient(780px 480px at 98% 2%, rgba(45,226,240,.16), transparent 60%),
    linear-gradient(165deg,#0D1A2B 0%,#06101D 48%,#08131f 100%);
  background-repeat:no-repeat;
  background-attachment:scroll;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{
  font-family:var(--font-serif);
  font-weight:700;
  line-height:1.18;
  letter-spacing:-.005em;
  color:var(--text);
}
h1{font-size:clamp(34px,5.2vw,56px);line-height:1.12}
h2{font-size:clamp(26px,3.4vw,40px)}
h3{font-size:clamp(20px,2.2vw,26px)}

p{color:var(--sub)}

::selection{background:rgba(45,226,240,.28);color:#fff}

/* ---------- 4. Utilities ---------- */
.visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}
.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(36px,5vw,76px)}
.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.02em;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--gold);
}
.eyebrow::before{
  content:"";
  width:26px;height:1px;
  background:linear-gradient(90deg,var(--flame),var(--gold));
}
.section-title{
  font-family:var(--font-serif);
  font-weight:700;
  font-size:clamp(26px,3.2vw,40px);
  line-height:1.18;
}
.lede{
  font-size:clamp(16px,1.6vw,18px);
  line-height:1.8;
  color:var(--sub);
  max-width:38em;
}

/* ---------- 5. Buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:0 22px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  font-family:var(--font-sans);
  font-size:15px;
  font-weight:700;
  letter-spacing:.01em;
  text-align:center;
  white-space:nowrap;
  cursor:pointer;
  transition:transform .18s var(--ease),background-color .18s ease,border-color .18s ease,box-shadow .18s ease,color .18s ease;
}
.btn--flame{
  color:#08131F;
  background:linear-gradient(112deg,var(--flame),var(--ember));
  box-shadow:0 14px 30px -18px rgba(255,90,47,.95);
}
.btn--flame:hover{
  transform:translateY(-1px);
  box-shadow:0 20px 36px -18px rgba(255,90,47,1);
}
.btn--line{
  color:var(--cyan-soft);
  border-color:rgba(45,226,240,.42);
  background:rgba(45,226,240,.07);
}
.btn--line:hover{
  color:#06101D;
  background:linear-gradient(112deg,var(--cyan),var(--cyan-soft));
  border-color:transparent;
}
.btn--ghost{
  color:var(--sub);
  border-color:var(--line-soft);
  background:rgba(30,42,56,.55);
}
.btn--ghost:hover{
  color:var(--text);
  border-color:rgba(45,226,240,.4);
}
.btn--block{width:100%}

/* ---------- 6. Chips / surfaces / media ---------- */
.chip{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:36px;
  padding:0 16px;
  border:1px solid var(--line-soft);
  border-radius:var(--r-pill);
  background:rgba(30,42,56,.6);
  color:var(--sub);
  font-family:var(--font-sans);
  font-size:13px;
  font-weight:600;
  letter-spacing:.01em;
  cursor:pointer;
  transition:color .16s ease,border-color .16s ease,background-color .16s ease;
}
.chip:hover{color:var(--cyan-soft);border-color:rgba(45,226,240,.5)}
.chip.is-active,
.chip[aria-pressed="true"]{
  color:#06101D;
  background:linear-gradient(112deg,var(--cyan),var(--cyan-soft));
  border-color:transparent;
}

.surface{
  border:1px solid var(--line-soft);
  border-radius:var(--r-lg);
  padding:clamp(18px,2.6vw,30px);
  background:linear-gradient(158deg,rgba(21,28,38,.96),rgba(13,26,43,.9));
  box-shadow:var(--shadow-1);
}

.media-frame{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  border-radius:var(--r-lg);
  border:1px solid rgba(140,244,255,.12);
  background:
    radial-gradient(120% 90% at 12% 8%, rgba(255,90,47,.28), transparent 58%),
    radial-gradient(110% 90% at 92% 90%, rgba(45,226,240,.24), transparent 60%),
    linear-gradient(150deg,#151C26,#0D1A2B 58%,#1E2A38);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:2;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(140,244,255,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140,244,255,.07) 1px, transparent 1px);
  background-size:36px 36px;
  opacity:.85;
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  position:relative;
  z-index:1;
}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--band{aspect-ratio:21/9}

/* ---------- 7. Breadcrumb ---------- */
.breadcrumb{margin-block:0 18px}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--weak);
}
.breadcrumb-item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb-item + .breadcrumb-item::before{
  content:"/";
  color:rgba(107,122,140,.7);
}
.breadcrumb-link{color:var(--sub);transition:color .16s ease}
.breadcrumb-link:hover{color:var(--cyan)}

/* ---------- 8. Reveal ---------- */
.js-reveal [data-reveal]{
  opacity:0;
  transform:translateY(10px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.js-reveal [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* =========================================================
   9. Header · side rail
   ========================================================= */
.site-header{
  position:relative;
  z-index:80;
}
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:300;
  padding:10px 18px;
  border-radius:var(--r-pill);
  background:var(--cyan);
  color:#06101D;
  font-weight:700;
  font-size:14px;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0)}

.rail{
  position:fixed;
  top:0;
  bottom:0;
  left:0;
  z-index:80;
  width:var(--rail-w);
  display:flex;
  flex-direction:column;
  gap:16px;
  padding:18px 14px 18px;
  overflow:hidden;
  background:
    linear-gradient(180deg,rgba(13,26,43,.99) 0%,rgba(6,16,29,.99) 56%,rgba(8,19,31,1) 100%);
  border-right:1px solid rgba(45,226,240,.16);
  box-shadow:22px 0 60px -46px rgba(0,0,0,1);
  transition:width .26s var(--ease),background-color .2s ease;
}
.rail::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(140,244,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140,244,255,.045) 1px, transparent 1px);
  background-size:32px 32px;
  opacity:.7;
}
.rail > *{position:relative;z-index:1}

.rail-head{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  width:224px;
  min-height:48px;
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  flex:1 1 auto;
  min-width:0;
}
.brand-mark{
  flex:0 0 44px;
  width:44px;
  height:44px;
  border-radius:14px;
  display:grid;
  place-items:center;
  font-family:var(--font-serif);
  font-size:20px;
  font-weight:700;
  color:#06101D;
  background:linear-gradient(135deg,var(--flame) 8%,var(--gold) 118%);
  box-shadow:0 12px 26px -16px rgba(255,90,47,.95);
}
.brand-mark::after{content:"英"}
.brand-text{
  display:flex;
  flex-direction:column;
  gap:2px;
  line-height:1.2;
  white-space:nowrap;
  opacity:0;
  transform:translateX(-6px);
  transition:opacity .18s ease .05s,transform .18s var(--ease) .05s;
}
.brand-name{
  font-family:var(--font-sans);
  font-size:17px;
  font-weight:800;
  letter-spacing:.02em;
  color:var(--text);
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--cyan);
  opacity:.85;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:0 16px;
  border:1px solid rgba(45,226,240,.36);
  border-radius:var(--r-pill);
  background:rgba(45,226,240,.08);
  color:var(--cyan-soft);
  font-family:var(--font-sans);
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
  cursor:pointer;
}
.nav-toggle-icon{
  position:relative;
  display:block;
  width:16px;
  height:14px;
}
.nav-toggle-icon::before{
  content:"";
  position:absolute;
  left:0;top:1px;
  width:16px;height:2px;
  border-radius:2px;
  background:currentColor;
  box-shadow:0 5px 0 currentColor,0 10px 0 currentColor;
  transition:transform .2s var(--ease),box-shadow .2s ease;
}
.rail[data-open="true"] .nav-toggle-icon::before{
  transform:translateY(5px) rotate(45deg);
  box-shadow:0 0 0 transparent;
}
.rail[data-open="true"] .nav-toggle-icon::after{
  content:"";
  position:absolute;
  left:0;top:6px;
  width:16px;height:2px;
  border-radius:2px;
  background:currentColor;
  transform:rotate(-45deg);
}

.site-nav{
  display:flex;
  flex-direction:column;
  gap:14px;
  flex:1 1 auto;
  min-height:0;
  width:224px;
  overflow-y:auto;
  overflow-x:hidden;
  scrollbar-width:thin;
  scrollbar-color:rgba(45,226,240,.4) transparent;
}
.site-nav::-webkit-scrollbar{width:4px}
.site-nav::-webkit-scrollbar-thumb{background:rgba(45,226,240,.35);border-radius:4px}

.nav-legend{
  display:flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:10px;
  font-weight:600;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--weak);
  white-space:nowrap;
}
.nav-legend-dot{
  width:6px;height:6px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 10px var(--cyan);
  flex:0 0 auto;
}

.nav-list{display:flex;flex-direction:column;gap:4px}
.nav-item{display:flex}
.nav-link{
  position:relative;
  display:flex;
  align-items:center;
  gap:12px;
  width:100%;
  min-height:46px;
  padding:0 12px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  color:var(--sub);
  white-space:nowrap;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.nav-idx{
  flex:0 0 auto;
  width:24px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.06em;
  color:var(--weak);
  transition:color .18s ease;
}
.nav-text{
  font-family:var(--font-sans);
  font-size:15px;
  font-weight:700;
  letter-spacing:.01em;
  opacity:0;
  transform:translateX(-6px);
  transition:opacity .18s ease .04s,transform .18s var(--ease) .04s;
}
.nav-link:hover{
  color:#fff;
  background:rgba(45,226,240,.09);
  border-color:rgba(45,226,240,.24);
}
.nav-link:hover .nav-idx{color:var(--cyan)}

.nav-link[aria-current="page"]{
  color:#08131F;
  background:linear-gradient(104deg,var(--flame),var(--ember));
  border-color:transparent;
  box-shadow:0 16px 34px -22px rgba(255,90,47,1);
}
.nav-link[aria-current="page"] .nav-idx,
.nav-link[aria-current="page"] .nav-text{color:#08131F}
.nav-link[aria-current="page"]:focus-visible{
  outline-color:var(--cyan);
  outline-offset:4px;
}

.rail-cta{
  display:flex;
  flex-direction:column;
  gap:8px;
  margin-top:auto;
  width:100%;
  opacity:0;
  transition:opacity .2s ease;
}

/* Desktop: hover / focus expand */
@media (min-width:1024px){
  .rail:hover,
  .rail:focus-within{width:var(--rail-open)}
  .rail:hover .brand-text,
  .rail:focus-within .brand-text,
  .rail:hover .nav-text,
  .rail:focus-within .nav-text{opacity:1;transform:none}
  .rail:hover .rail-cta,
  .rail:focus-within .rail-cta{opacity:1}
  body{padding-left:var(--rail-w)}
}

/* Progress rail */
.rail-progress{
  position:absolute;
  top:0;
  bottom:0;
  right:0;
  width:2px;
  background:rgba(45,226,240,.10);
  z-index:2;
  pointer-events:none;
}
.rail-progress-fill{
  display:block;
  width:100%;
  height:calc(var(--progress,0) * 100%);
  background:linear-gradient(180deg,var(--cyan),var(--ember) 70%,var(--flame));
  box-shadow:0 0 12px rgba(45,226,240,.55);
}

/* =========================================================
   10. Mobile · top bar + drawer
   ========================================================= */
@media (max-width:1023px){
  .site-header{
    position:sticky;
    top:0;
    z-index:120;
  }
  .rail{
    position:relative;
    top:auto;
    bottom:auto;
    left:auto;
    width:100%;
    height:var(--rail-bar-h);
    flex-direction:row;
    align-items:center;
    gap:10px;
    padding:0 16px;
    overflow:visible;
    border-right:0;
    border-bottom:1px solid rgba(45,226,240,.18);
    background:linear-gradient(180deg,rgba(9,20,34,.99),rgba(6,16,29,.97));
    z-index:2;
  }
  .rail-head{
    width:100%;
    min-height:0;
    gap:12px;
  }
  .brand-text{opacity:1;transform:none}
  .brand-name{font-size:16px}
  .brand-sub{font-size:9px;letter-spacing:.14em}
  .nav-toggle{display:inline-flex;flex:0 0 auto}

  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    width:auto;
    z-index:1;
    max-height:calc(100dvh - var(--rail-bar-h));
    padding:20px var(--gutter) 32px;
    gap:16px;
    overflow-y:auto;
    background:linear-gradient(180deg,rgba(8,19,31,.99),rgba(13,26,43,.99));
    border-bottom:1px solid rgba(45,226,240,.2);
    box-shadow:0 40px 70px -40px rgba(0,0,0,1);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .2s ease,transform .22s var(--ease),visibility .2s ease;
  }
  .rail[data-open="true"] .site-nav{
    opacity:1;
    visibility:visible;
    transform:none;
  }
  .nav-text{opacity:1;transform:none;font-size:16px}
  .nav-link{min-height:52px;padding:0 16px;width:100%}
  .nav-idx{width:28px;font-size:12px}
  .rail-cta{opacity:1;margin-top:8px}
  .rail-progress{
    top:auto;
    bottom:-1px;
    left:0;
    right:0;
    width:auto;
    height:2px;
  }
  .rail-progress-fill{
    width:calc(var(--progress,0) * 100%);
    height:100%;
    background:linear-gradient(90deg,var(--cyan),var(--ember) 72%,var(--flame));
  }
  .skip-link{top:72px}
}

/* =========================================================
   11. Footer
   ========================================================= */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  overflow:hidden;
  border-top:1px solid rgba(45,226,240,.16);
  background:linear-gradient(180deg,rgba(13,26,43,.94),rgba(6,16,29,1));
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(140,244,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140,244,255,.05) 1px, transparent 1px);
  background-size:64px 64px;
  opacity:.75;
}
.site-footer::after{
  content:"";
  position:absolute;
  top:-160px;
  right:-120px;
  width:420px;
  height:420px;
  border-radius:50%;
  pointer-events:none;
  background:radial-gradient(circle,rgba(255,90,47,.20),transparent 68%);
}
.footer-inner{
  position:relative;
  z-index:1;
  max-width:var(--maxw);
  margin-inline:auto;
  padding:clamp(40px,5vw,68px) var(--gutter) 24px;
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(240px,1.15fr) minmax(0,1.9fr) minmax(240px,1.1fr);
  gap:clamp(26px,4vw,56px);
}
.footer-brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  margin-bottom:18px;
}
.footer-brand-name{
  font-family:var(--font-sans);
  font-size:20px;
  font-weight:800;
  letter-spacing:.02em;
  color:var(--text);
}
.footer-summary{
  font-size:15px;
  line-height:1.8;
  color:var(--sub);
  max-width:32em;
}
.footer-coord{
  margin-top:18px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--weak);
}
.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,2.4vw,32px);
}
.footer-col{min-width:0}
.footer-col-title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-list{display:flex;flex-direction:column;gap:2px}
.footer-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding-block:6px;
  font-size:15px;
  color:var(--sub);
  transition:color .16s ease;
}
.footer-link::before{
  content:"";
  width:10px;
  height:1px;
  background:var(--weak);
  transition:width .18s var(--ease),background-color .18s ease;
}
.footer-link:hover{color:var(--cyan-soft)}
.footer-link:hover::before{width:18px;background:var(--cyan)}

.footer-contact{min-width:0}
.contact-list{display:flex;flex-direction:column;gap:0}
.contact-list li{
  display:flex;
  gap:10px;
  padding-block:8px;
  border-bottom:1px dashed rgba(174,188,203,.16);
  font-size:14px;
  line-height:1.6;
}
.contact-key{
  flex:0 0 40px;
  padding-top:2px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--weak);
}
.contact-value{color:var(--sub);word-break:break-word;min-width:0}
.contact-note{
  margin-top:14px;
  font-size:13px;
  line-height:1.7;
  color:var(--weak);
}
.footer-cta{margin-top:16px;min-height:42px;padding:0 18px;font-size:14px}

.footer-bar{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px 22px;
  margin-top:clamp(30px,4vw,48px);
  padding-top:20px;
  border-top:1px solid var(--line-soft);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--weak);
}
.footer-copy{color:var(--sub)}
.footer-icp{color:var(--weak)}
.footer-legal{
  color:var(--weak);
  transition:color .16s ease;
}
.footer-legal:hover{color:var(--cyan)}

/* =========================================================
   12. Responsive
   ========================================================= */
@media (max-width:1180px){
  .footer-top{
    grid-template-columns:minmax(0,1fr) minmax(0,1fr);
  }
  .footer-brand-cell{grid-column:1 / -1}
}
@media (max-width:820px){
  .footer-top{grid-template-columns:minmax(0,1fr)}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:520px){
  .footer-nav{grid-template-columns:minmax(0,1fr)}
  .btn{padding:0 18px;font-size:14px}
  .footer-bar{gap:6px 16px;font-size:11px}
}

/* =========================================================
   13. Reduced motion
   ========================================================= */
@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;
  }
  .js-reveal [data-reveal]{
    opacity:1!important;
    transform:none!important;
  }
  .rail:hover,
  .rail:focus-within{transition:none}
}