/* ============================================================
   必一赛场 / INSIDER ARENA — 共享样式 /assets/site.css
   ============================================================ */

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

/* 2. Design tokens ------------------------------------------ */
:root{
  --ink:#05080F;
  --ink-2:#0B1626;
  --line:#1C2B40;
  --fog:#EAF2FF;
  --mute:#8FA0B8;
  --volt:#C6FF3D;
  --flame:#FF7A1A;
  --cyan:#32E6C8;
  --violet:#8B6CFF;

  --shell:1440px;
  --gutter:clamp(16px,4vw,72px);

  --font-display:"Archivo Black","Noto Sans SC","Inter Tight","Helvetica Neue",Arial,sans-serif;
  --font-body:"Noto Sans SC","Inter","Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --dur:.18s;
  --ease:cubic-bezier(.3,.8,.3,1);
}

/* 3. Base typography ---------------------------------------- */
body{
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(28,43,64,.30) 1px,transparent 1px),
    linear-gradient(90deg,rgba(28,43,64,.30) 1px,transparent 1px);
  background-size:96px 96px;
  color:var(--fog);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:900;
  line-height:.95;
  letter-spacing:-.03em;
}
h1{font-size:clamp(56px,9vw,168px);line-height:.92;letter-spacing:-.04em}
h2{font-size:clamp(28px,4vw,64px);line-height:1.05;letter-spacing:-.02em}
h3{font-size:clamp(20px,2.4vw,32px);line-height:1.12}
p{max-width:42ch}
::selection{background:var(--volt);color:var(--ink)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
#main-content{display:block;scroll-margin-top:132px}

/* 4. Layout helpers ----------------------------------------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.04em;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--volt);
}
.eyebrow::before{content:"";width:22px;height:1px;background:currentColor}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--mute);
  line-height:1.4;
}
.tag--volt{background:var(--volt);border-color:var(--volt);color:var(--ink)}
.tag--flame{border-color:rgba(255,122,26,.55);color:var(--flame)}

/* 5. Buttons ------------------------------------------------ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 22px;
  border:1px solid var(--line);
  background:rgba(11,22,38,.72);
  color:var(--fog);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.16em;
  line-height:1;
  text-transform:uppercase;
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease),
             border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn::after{content:"→";font-size:13px;line-height:1;transition:transform var(--dur) var(--ease)}
.btn:hover{border-color:var(--volt);color:var(--volt);transform:translateY(-2px)}
.btn:hover::after{transform:translateX(4px)}
.btn--solid{background:var(--volt);border-color:var(--volt);color:var(--ink)}
.btn--solid:hover{background:var(--cyan);border-color:var(--cyan);color:var(--ink)}
.btn--ghost{background:transparent}

/* 6. Breadcrumbs -------------------------------------------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--mute);
}
.crumb{color:var(--mute);transition:color var(--dur) var(--ease)}
.crumb:hover{color:var(--cyan)}
.crumb-sep{color:var(--line)}
.crumb-current{color:var(--fog)}

/* 7. Media frames ------------------------------------------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16 / 9;
  background-color:var(--ink-2);
  border:1px solid var(--line);
  isolation:isolate;
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.92) contrast(1.06);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(0deg,rgba(5,8,15,.30) 0 1px,transparent 1px 4px),
    linear-gradient(180deg,rgba(5,8,15,0) 42%,rgba(5,8,15,.74) 100%);
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame--cut{clip-path:polygon(0 0,100% 0,100% calc(100% - 48px),calc(100% - 48px) 100%,0 100%)}
.media-frame--ph{
  background-image:
    linear-gradient(135deg,rgba(198,255,61,.12),transparent 55%),
    repeating-linear-gradient(135deg,rgba(28,43,64,.62) 0 2px,transparent 2px 12px);
}

/* 8. Reveal ------------------------------------------------- */
html[data-js="on"] [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .4s var(--ease),transform .4s var(--ease);
}
html[data-js="on"] [data-reveal][data-revealed]{opacity:1;transform:none}

/* 9. Skip link ---------------------------------------------- */
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:200;
  padding:12px 18px;
  background:var(--volt);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.12em;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:none;outline:2px solid var(--ink);outline-offset:3px}

/* 10. Header ------------------------------------------------ */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(5,8,15,.96);
  border-bottom:1px solid var(--line);
  transition:background var(--dur) var(--ease);
}
.site-header[data-scrolled="true"]{background:rgba(5,8,15,.99)}

.header-rail{
  display:flex;
  align-items:center;
  gap:10px;
  padding:5px var(--gutter);
  border-bottom:1px solid rgba(28,43,64,.65);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.28em;
  text-transform:uppercase;
  color:var(--mute);
  white-space:nowrap;
  overflow:hidden;
}
.rail-dot{
  flex:0 0 auto;
  width:6px;
  height:6px;
  background:var(--volt);
  box-shadow:0 0 0 3px rgba(198,255,61,.14);
  animation:rail-pulse 2.4s ease-in-out infinite;
}
.rail-text{color:var(--fog)}
.rail-meta{margin-left:auto;color:var(--line);letter-spacing:.22em}
@keyframes rail-pulse{0%,100%{opacity:1}50%{opacity:.35}}

.header-inner{
  position:relative;
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding:14px var(--gutter);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:clamp(16px,3vw,48px);
  min-height:76px;
  transition:min-height var(--dur) var(--ease),padding var(--dur) var(--ease);
}
.site-header[data-scrolled="true"] .header-inner{min-height:60px;padding-block:8px}

.brand-block{display:flex;align-items:center;gap:14px;min-width:0}
.brand-link{display:flex;align-items:center;gap:12px}
.brand-mark{
  flex:0 0 auto;
  width:38px;
  height:38px;
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  justify-content:center;
  gap:5px;
  padding-left:9px;
  background:linear-gradient(150deg,var(--volt) 0 46%,var(--flame) 46% 100%);
  clip-path:polygon(0 0,100% 0,100% 72%,72% 100%,0 100%);
  transition:filter var(--dur) var(--ease);
}
.brand-mark>span{display:block;height:3px;background:var(--ink)}
.brand-mark>span:first-child{width:16px}
.brand-mark>span:last-child{width:9px}
.brand-link:hover .brand-mark{filter:brightness(1.12)}
.brand-text{display:flex;flex-direction:column;gap:3px}
.brand-name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:21px;
  line-height:1;
  letter-spacing:.02em;
  color:var(--fog);
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:9.5px;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--mute);
}
.brand-domain{
  display:none;
  padding-left:12px;
  border-left:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--mute);
  max-width:none;
}

/* 移动导航按钮 */
.nav-toggle{
  display:none;
  position:relative;
  z-index:95;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  border:1px solid var(--line);
  background:rgba(11,22,38,.92);
  color:var(--fog);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--volt);color:var(--volt)}
.nav-toggle-icon{
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  width:18px;
  height:12px;
}
.nav-toggle-bar{
  display:block;
  width:100%;
  height:2px;
  background:currentColor;
  transition:transform .2s var(--ease);
}
.site-header[data-open="true"] .nav-toggle-bar:first-child{transform:translateY(5px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle-bar:last-child{transform:translateY(-5px) rotate(-45deg)}

/* 导航本体 */
.site-nav{display:flex;align-items:center;gap:clamp(18px,3vw,52px)}
.nav-group{
  display:flex;
  flex-direction:column;
  gap:8px;
  padding-left:14px;
  border-left:1px solid var(--line);
}
.nav-group-label{
  font-family:var(--font-mono);
  font-size:10px;
  line-height:1;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--flame);
  max-width:none;
}
.nav-group:nth-child(2) .nav-group-label{color:var(--violet)}
.nav-list{display:flex;flex-direction:column;gap:2px}
.nav-item{display:block}
.nav-link{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:8px;
  padding:4px 0;
  font-size:14.5px;
  font-weight:500;
  color:var(--fog);
  transition:color var(--dur) var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:1px;
  background:var(--volt);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform var(--dur) var(--ease);
}
.nav-num{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.08em;
  color:var(--mute);
  transition:color var(--dur) var(--ease);
}
.nav-label{white-space:nowrap}
.nav-link:hover{color:var(--volt)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link:hover .nav-num{color:var(--volt)}
.nav-link[aria-current="page"]{color:var(--volt)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-link[aria-current="page"] .nav-num{color:var(--volt)}
.nav-utility{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:10px;
  padding-left:clamp(12px,2vw,28px);
  border-left:1px solid var(--line);
}
.nav-cta{white-space:nowrap}
.nav-tip{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.14em;
  line-height:1.5;
  color:var(--mute);
  max-width:none;
}

/* 11. Ticker ------------------------------------------------ */
.ticker{
  display:flex;
  align-items:stretch;
  overflow:hidden;
  border-top:1px solid rgba(28,43,64,.8);
  background:linear-gradient(90deg,rgba(11,22,38,.92),rgba(5,8,15,.55));
}
.ticker-tag{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  gap:8px;
  padding:0 14px;
  background:var(--volt);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.18em;
}
.ticker-tag::before{
  content:"";
  width:6px;
  height:6px;
  background:var(--ink);
  border-radius:50%;
  animation:rail-pulse 1.6s ease-in-out infinite;
}
.ticker-viewport{
  flex:1 1 auto;
  overflow:hidden;
  min-width:0;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 28px,#000 calc(100% - 28px),transparent);
  mask-image:linear-gradient(90deg,transparent,#000 28px,#000 calc(100% - 28px),transparent);
}
.ticker-track{
  display:flex;
  width:max-content;
  animation:ticker-run var(--ticker-duration,46s) linear infinite;
  will-change:transform;
}
.ticker-item{
  display:flex;
  align-items:center;
  gap:10px;
  padding:9px 22px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--mute);
  white-space:nowrap;
}
.ticker-item b{color:var(--fog);font-weight:700}
.ticker-item::after{content:"";width:5px;height:5px;background:var(--line)}
.ticker[data-paused="true"] .ticker-track{animation-play-state:paused}
.ticker-btn{
  flex:0 0 auto;
  padding:0 16px;
  border-left:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.2em;
  color:var(--mute);
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.ticker-btn:hover{color:var(--volt);background:rgba(198,255,61,.06)}
.ticker-btn[aria-pressed="true"]{color:var(--flame)}
@keyframes ticker-run{from{transform:translate3d(0,0,0)}to{transform:translate3d(-50%,0,0)}}

/* 12. Scroll progress --------------------------------------- */
.header-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  pointer-events:none;
  background:rgba(28,43,64,.6);
}
.header-progress-bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--volt),var(--cyan) 58%,var(--flame));
  transition:width .1s linear;
}

/* 13. Footer ------------------------------------------------ */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,120px);
  padding:clamp(44px,6vw,80px) var(--gutter) 0;
  border-top:1px solid var(--line);
  background:
    radial-gradient(120% 130% at 0% 0%,rgba(198,255,61,.07),transparent 46%),
    radial-gradient(100% 110% at 100% 0%,rgba(255,122,26,.07),transparent 52%),
    var(--ink-2);
}
.footer-grid{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(28px,3.4vw,56px);
  align-items:start;
}
.footer-brand{display:flex;flex-direction:column;gap:10px}
.footer-brand-link{display:flex;flex-direction:column;gap:4px;align-self:flex-start}
.footer-brand-name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:26px;
  line-height:1;
  letter-spacing:.01em;
  color:var(--fog);
}
.footer-brand-sub{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--mute);
}
.footer-slogan{
  padding-left:12px;
  border-left:2px solid var(--volt);
  font-size:15px;
  line-height:1.6;
  color:var(--fog);
  max-width:22ch;
}
.footer-domain,
.footer-icp{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--mute);
  max-width:none;
}
.footer-icp{color:var(--line)}
.footer-col{display:flex;flex-direction:column}
.footer-col-title{
  display:flex;
  align-items:center;
  gap:8px;
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.24em;
  line-height:1;
  text-transform:uppercase;
  color:var(--volt);
}
.footer-col-title::before{content:"";width:14px;height:1px;background:currentColor}
.footer-links{display:flex;flex-direction:column;gap:9px}
.footer-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:14px;
  color:var(--mute);
  transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.footer-link::before{
  content:"";
  width:0;
  height:1px;
  background:var(--volt);
  transition:width var(--dur) var(--ease);
}
.footer-link:hover{color:var(--fog);transform:translateX(2px)}
.footer-link:hover::before{width:12px}
.footer-contact{display:flex;flex-direction:column}
.footer-contact-list{display:flex;flex-direction:column;gap:10px}
.footer-contact-item{
  display:grid;
  grid-template-columns:44px 1fr;
  gap:10px;
  align-items:baseline;
  font-size:13.5px;
  line-height:1.7;
}
.footer-contact-label{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:var(--mute);
}
.footer-contact-value{color:var(--fog);word-break:break-word}
.footer-note{
  margin-top:14px;
  padding-left:12px;
  border-left:2px solid var(--flame);
  font-size:12.5px;
  line-height:1.7;
  color:var(--mute);
  max-width:36ch;
}
.footer-links--legal{
  flex-direction:row;
  flex-wrap:wrap;
  gap:18px;
  margin-top:16px;
  padding-top:14px;
  border-top:1px solid var(--line);
}
.footer-base{
  width:100%;
  max-width:var(--shell);
  margin:clamp(32px,4vw,56px) auto 0;
  padding:18px 0 0;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--mute);
}
.footer-copy,
.footer-legal{max-width:none}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;gap:8px;color:var(--line)}
.footer-legal-sep{color:var(--line)}
.footer-scale{
  position:relative;
  width:100%;
  height:14px;
  margin-top:4px;
  border-bottom:1px solid var(--line);
  background-image:repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 12px);
  background-repeat:repeat-x;
  background-position:bottom left;
  background-size:100% 7px;
}
.footer-scale::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-1px;
  width:clamp(64px,14%,180px);
  height:2px;
  background:linear-gradient(90deg,var(--volt),transparent);
}

/* 14. Responsive -------------------------------------------- */
@media (min-width:640px){
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (min-width:768px){
  .brand-domain{display:block}
}
@media (min-width:1024px){
  .nav-toggle{display:none}
  .footer-grid{grid-template-columns:1.5fr 1fr 1fr 1.4fr}
  .footer-col--offset{padding-top:clamp(12px,2vw,28px)}
}
@media (max-width:1023px){
  .nav-toggle{display:inline-flex}
  .site-header .site-nav{
    position:fixed;
    top:0;
    right:0;
    z-index:90;
    width:min(370px,88vw);
    height:100dvh;
    padding:clamp(88px,16vh,120px) 24px 40px;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:26px;
    background:var(--ink-2);
    border-left:1px solid var(--line);
    box-shadow:-30px 0 60px rgba(0,0,0,.65);
    overflow-y:auto;
    transform:translateX(102%);
    visibility:hidden;
    transition:transform .24s var(--ease),visibility 0s linear .24s;
  }
  .site-header[data-open="true"] .site-nav{
    transform:none;
    visibility:visible;
    transition:transform .24s var(--ease),visibility 0s linear 0s;
  }
  .nav-group{
    padding-left:0;
    padding-top:16px;
    border-left:0;
    border-top:1px solid var(--line);
  }
  .nav-link{font-size:16px;padding:8px 0}
  .nav-num{font-size:11px}
  .nav-utility{
    margin-top:auto;
    padding-left:0;
    border-left:0;
    border-top:1px solid var(--line);
    padding-top:20px;
    align-items:stretch;
  }
  .nav-cta{width:100%}
  .rail-meta{display:none}
}
@media (max-width:639px){
  .brand-mark{width:32px;height:32px}
  .brand-name{font-size:18px}
  .brand-sub{font-size:8.5px;letter-spacing:.2em}
  .header-inner{min-height:64px;padding-block:10px}
  .ticker-item{padding:8px 16px;font-size:11px}
  .ticker-tag{padding:0 10px;font-size:10px}
  .ticker-btn{padding:0 12px;font-size:10px}
  .footer-contact-item{grid-template-columns:1fr;gap:2px}
  .footer-links--legal{gap:14px}
}

/* 15. Motion preferences ------------------------------------ */
@media (prefers-reduced-motion:reduce){
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .ticker-track{animation:none !important;transform:none !important}
  .rail-dot,.ticker-tag::before{animation:none !important}
  html[data-js="on"] [data-reveal]{opacity:1 !important;transform:none !important}
}