/* ===== 天博赛场 · Site Kit /assets/site.css ===== */

/* 1. reset */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;background:#04101A}
body,h1,h2,h3,h4,h5,h6,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{font:inherit;color:inherit;background:none;border:0}
a{color:inherit}

/* 2. tokens */
:root{
  --sea:#04101A;
  --panel-1:#071C2E;
  --panel-2:#0C2C46;
  --steel:#12466B;
  --cyan:#2BE8C8;
  --mint:#7CFFD9;
  --heat:#FF5A36;
  --violet:#9A6BFF;
  --ink:#E8F6FF;
  --ink-dim:#93AFC4;
  --white:#FFFFFF;
  --line:rgba(43,232,200,.24);
  --line-soft:rgba(147,175,196,.22);
  --shadow-hard:6px 6px 0 rgba(0,0,0,.6);
  --shadow-cyan:6px 6px 0 rgba(43,232,200,.2);
  --ff-display:"Noto Serif SC","Source Han Serif SC","Songti SC",serif;
  --ff-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --ff-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,monospace;
  --wrap:1280px;
  --gutter:20px;
}
@media (min-width:1024px){:root{--gutter:48px}}

/* 3. base */
body{
  min-height:100vh;
  background:var(--sea);
  color:var(--ink);
  font-family:var(--ff-body);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  opacity:.5;
  background-image:
    linear-gradient(to right,rgba(18,70,107,.38) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(18,70,107,.38) 1px,transparent 1px);
  background-size:72px 72px;
}
main{position:relative;z-index:1;display:block}
h1,h2,h3,h4,h5,h6{font-family:var(--ff-display);font-weight:900;letter-spacing:-.01em;line-height:1.12}
h1{font-size:clamp(34px,6vw,76px);line-height:1.05}
h2{font-size:clamp(26px,3.6vw,40px)}
h3{font-family:var(--ff-body);font-weight:800;font-size:clamp(18px,2.2vw,24px);line-height:1.35}
p{max-width:76ch}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
::selection{background:var(--cyan);color:#04101A}

/* 4. layout helpers */
.wrap{width:min(var(--wrap),calc(100% - var(--gutter) * 2));margin-inline:auto}
.lead{font-size:clamp(16px,1.6vw,18px);line-height:1.8;color:var(--ink-dim);max-width:64ch}
.mono{font-family:var(--ff-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-dim)}

/* 5. buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:10px 16px;
  border:2px solid var(--steel);
  background:transparent;
  color:var(--ink);
  font-family:var(--ff-mono);
  font-size:12px;
  letter-spacing:.1em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .18s ease,border-color .18s ease,background-color .18s ease,color .18s ease,box-shadow .18s ease;
}
.btn:hover{transform:translateY(-2px);border-color:var(--cyan);color:var(--cyan)}
.btn--ghost{background:rgba(12,44,70,.6);color:var(--ink)}
.btn--ghost:hover{background:rgba(43,232,200,.1)}
.btn--solid{background:var(--cyan);border-color:var(--cyan);color:#04101A;box-shadow:4px 4px 0 rgba(43,232,200,.22)}
.btn--solid:hover{background:var(--mint);border-color:var(--mint);color:#04101A;box-shadow:4px 4px 0 var(--heat)}

/* 6. skip link */
.skip-link{
  position:absolute;
  top:-80px;
  left:12px;
  z-index:200;
  padding:10px 16px;
  border:2px solid #04101A;
  background:var(--cyan);
  color:#04101A;
  font-family:var(--ff-mono);
  font-size:13px;
  letter-spacing:.08em;
  text-decoration:none;
  transition:top .18s ease;
}
.skip-link:focus{top:12px}

/* 7. header */
.site-head{
  position:sticky;
  top:0;
  z-index:60;
  background:linear-gradient(180deg,rgba(4,16,26,.98),rgba(7,28,46,.95));
  border-bottom:2px solid var(--steel);
  box-shadow:0 10px 30px rgba(0,0,0,.45);
}
.site-head__grid{
  width:min(var(--wrap),calc(100% - var(--gutter) * 2));
  margin-inline:auto;
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  grid-template-areas:
    "brand toggle"
    "actions actions"
    "nav nav";
  gap:10px;
  padding:10px 0 12px;
  align-items:center;
}
.brand{
  grid-area:brand;
  display:inline-flex;
  align-items:center;
  gap:10px;
  text-decoration:none;
  min-width:0;
}
.brand__mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  flex:0 0 auto;
  width:34px;
  height:34px;
  border:2px solid var(--cyan);
  background:rgba(43,232,200,.1);
  color:var(--cyan);
  font-family:var(--ff-mono);
  font-size:12px;
  letter-spacing:.04em;
  box-shadow:3px 3px 0 rgba(43,232,200,.25);
}
.brand__text{display:flex;flex-direction:column;min-width:0;line-height:1.15}
.brand__word{
  font-family:var(--ff-display);
  font-weight:900;
  font-size:19px;
  letter-spacing:.01em;
  color:var(--ink);
  white-space:nowrap;
}
.brand__sub{
  font-family:var(--ff-mono);
  font-size:9.5px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--ink-dim);
  white-space:nowrap;
}
.nav-toggle{
  grid-area:toggle;
  display:inline-flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
  min-width:48px;
  min-height:44px;
  padding:6px 8px;
  border:2px solid var(--steel);
  background:var(--panel-1);
  color:var(--ink-dim);
  cursor:pointer;
  transition:border-color .18s ease,color .18s ease;
}
.nav-toggle__bars{
  display:block;
  width:18px;
  height:2px;
  background:var(--cyan);
  box-shadow:0 -6px 0 var(--cyan),0 6px 0 var(--cyan);
}
.nav-toggle__label{
  font-family:var(--ff-mono);
  font-size:9px;
  letter-spacing:.16em;
  text-transform:uppercase;
}
.nav-toggle[aria-expanded="true"]{border-color:var(--cyan);color:var(--cyan);background:rgba(43,232,200,.1)}
.cmd-actions{
  grid-area:actions;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
}
.cmd-actions .btn{flex:1 1 0;min-width:0}
.cmd-status{
  display:none;
  align-items:center;
  gap:8px;
  font-family:var(--ff-mono);
  font-size:10.5px;
  letter-spacing:.08em;
  color:var(--ink-dim);
  text-transform:uppercase;
  white-space:nowrap;
}
.cmd-status__text{display:inline-block}
.status-dot{
  width:8px;
  height:8px;
  flex:0 0 auto;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(43,232,200,.2);
  animation:pulse 2.8s ease-in-out infinite;
}
@keyframes pulse{
  0%,100%{opacity:1;box-shadow:0 0 0 3px rgba(43,232,200,.2)}
  50%{opacity:.55;box-shadow:0 0 0 6px rgba(43,232,200,.05)}
}
.cmd-nav{grid-area:nav;display:none}
.cmd-nav[data-open]{display:block}
.cmd-nav__list{
  display:flex;
  flex-direction:column;
  gap:2px;
  padding-top:8px;
  border-top:1px solid var(--line-soft);
}
.cmd-nav__item{min-width:0}
.cmd-nav__link{
  display:flex;
  align-items:center;
  gap:10px;
  padding:11px 8px;
  border-left:2px solid transparent;
  color:var(--ink);
  font-size:15px;
  text-decoration:none;
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.cmd-nav__idx{
  font-family:var(--ff-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--steel);
  transition:color .18s ease;
}
.cmd-nav__link:hover{color:var(--cyan);border-left-color:var(--cyan);background:rgba(43,232,200,.07)}
.cmd-nav__link:hover .cmd-nav__idx{color:var(--cyan)}
.cmd-nav__link[aria-current="page"]{
  color:var(--cyan);
  border-left-color:var(--cyan);
  background:rgba(43,232,200,.09);
  font-weight:700;
}
.cmd-nav__link[aria-current="page"] .cmd-nav__idx{color:var(--heat)}

@media (min-width:960px){
  .site-head__grid{
    grid-template-columns:auto minmax(0,1fr) auto;
    grid-template-areas:"brand nav actions";
    gap:22px;
    padding:12px 0;
  }
  .nav-toggle{display:none}
  .cmd-nav{display:block}
  .cmd-nav__list{
    flex-direction:row;
    flex-wrap:wrap;
    justify-content:center;
    gap:2px;
    padding-top:0;
    border-top:0;
  }
  .cmd-nav__link{
    padding:9px 10px;
    border-left:0;
    border-bottom:2px solid transparent;
    font-size:14px;
  }
  .cmd-nav__link:hover{border-bottom-color:var(--cyan);border-left-color:transparent;background:transparent}
  .cmd-nav__link[aria-current="page"]{
    border-left-color:transparent;
    border-bottom-color:var(--cyan);
    background:transparent;
  }
  .cmd-actions{justify-content:flex-end;flex-wrap:nowrap}
  .cmd-actions .btn{flex:0 0 auto}
}
@media (min-width:1100px){
  .cmd-status{display:inline-flex}
}

/* 8. footer */
.site-foot{
  position:relative;
  z-index:1;
  margin-top:72px;
  background:linear-gradient(180deg,var(--panel-1),var(--sea));
  border-top:2px solid var(--steel);
}
.foot-grid{
  width:min(var(--wrap),calc(100% - var(--gutter) * 2));
  margin-inline:auto;
  display:grid;
  grid-template-columns:1fr;
  gap:30px;
  padding:44px 0 30px;
}
.foot-brand__word{
  font-family:var(--ff-display);
  font-weight:900;
  font-size:26px;
  letter-spacing:-.01em;
  color:var(--ink);
  margin-bottom:8px;
}
.foot-brand__desc{
  font-size:14px;
  line-height:1.8;
  color:var(--ink-dim);
  max-width:34ch;
  margin-bottom:14px;
}
.foot-tag{
  display:inline-block;
  padding:5px 9px;
  border:1px solid var(--line);
  background:rgba(43,232,200,.08);
  color:var(--cyan);
  font-family:var(--ff-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
}
.foot-col__title{
  margin-bottom:12px;
  padding-bottom:8px;
  border-bottom:1px solid var(--line-soft);
  font-family:var(--ff-mono);
  font-size:11px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--heat);
}
.foot-list{display:grid;gap:9px}
.foot-list__item{min-width:0}
.foot-link{
  display:inline-block;
  font-size:14px;
  color:var(--ink);
  text-decoration:none;
  border-bottom:1px solid transparent;
  padding-bottom:1px;
  transition:color .18s ease,border-color .18s ease;
}
.foot-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.foot-contact{gap:10px}
.foot-contact__row{
  display:grid;
  grid-template-columns:52px minmax(0,1fr);
  gap:8px;
  align-items:start;
  font-size:13px;
  line-height:1.7;
}
.foot-contact__label{
  font-family:var(--ff-mono);
  font-size:9.5px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:rgba(147,175,196,.75);
  padding-top:3px;
}
.foot-contact__value{color:var(--ink);word-break:break-word}
.foot-note{
  margin-top:14px;
  padding-left:10px;
  border-left:2px solid var(--steel);
  font-size:12px;
  line-height:1.7;
  color:var(--ink-dim);
}
.foot-bottom{
  width:min(var(--wrap),calc(100% - var(--gutter) * 2));
  margin-inline:auto;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 20px;
  padding:16px 0 22px;
  border-top:1px solid var(--line-soft);
}
.foot-copy,.foot-icp{
  font-family:var(--ff-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--ink-dim);
}
.foot-icp{color:var(--mint)}
@media (min-width:720px){
  .foot-grid{grid-template-columns:1fr 1fr;gap:34px}
}
@media (min-width:1024px){
  .foot-grid{grid-template-columns:1.5fr 1fr 1.3fr 1fr;gap:40px;padding:52px 0 36px}
}

/* 9. chapter / section heading */
.chapter{
  display:grid;
  gap:7px;
  margin-bottom:26px;
  padding-left:14px;
  border-left:2px solid var(--steel);
  transition:border-color .2s ease;
}
.chapter.is-current{border-left-color:var(--cyan)}
.chapter__idx{
  font-family:var(--ff-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--heat);
}
.chapter__title{
  font-family:var(--ff-display);
  font-weight:900;
  font-size:clamp(24px,3.4vw,38px);
  line-height:1.15;
  color:var(--ink);
}
.chapter__note{
  font-size:14px;
  line-height:1.8;
  color:var(--ink-dim);
  max-width:62ch;
}

/* 10. breadcrumbs */
.crumbs{margin-bottom:22px}
.crumbs__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px;
  font-family:var(--ff-mono);
  font-size:11px;
  letter-spacing:.08em;
}
.crumbs__item{display:flex;align-items:center;gap:6px}
.crumbs__link{color:var(--ink-dim);text-decoration:none;transition:color .18s ease}
.crumbs__link:hover{color:var(--cyan)}
.crumbs__sep{color:var(--steel)}
.crumbs__current{color:var(--mint)}

/* 11. panel */
.panel{
  position:relative;
  border:2px solid var(--steel);
  background:var(--panel-1);
  box-shadow:var(--shadow-hard);
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.panel:hover{transform:translate(-2px,-2px);border-color:var(--cyan);box-shadow:var(--shadow-cyan)}
.panel__head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:11px 16px;
  border-bottom:2px solid var(--steel);
  background:var(--panel-2);
}
.panel__idx{
  font-family:var(--ff-mono);
  font-size:10.5px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--heat);
}
.panel__title{font-family:var(--ff-body);font-weight:800;font-size:15px;letter-spacing:.02em;color:var(--ink)}
.panel__body{padding:18px 16px}

/* 12. tags & chips */
.tag{
  display:inline-block;
  padding:3px 8px;
  border:1px solid var(--line);
  background:rgba(43,232,200,.08);
  color:var(--cyan);
  font-family:var(--ff-mono);
  font-size:10px;
  letter-spacing:.14em;
  text-transform:uppercase;
}
.tag--heat{color:var(--heat);border-color:rgba(255,90,54,.5);background:rgba(255,90,54,.12)}
.tag--mint{color:var(--mint);border-color:rgba(124,255,217,.5);background:rgba(124,255,217,.1)}
.tag--violet{color:var(--violet);border-color:rgba(154,107,255,.5);background:rgba(154,107,255,.14)}
.chip{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:40px;
  padding:8px 14px;
  border:1px solid var(--steel);
  background:var(--panel-1);
  color:var(--ink-dim);
  font-family:var(--ff-mono);
  font-size:11px;
  letter-spacing:.1em;
  text-decoration:none;
  cursor:pointer;
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.chip:hover{color:var(--cyan);border-color:var(--cyan)}
.chip[aria-pressed="true"],.chip.is-active{
  background:var(--cyan);
  border-color:var(--cyan);
  color:#04101A;
  font-weight:700;
}

/* 13. media frame（页面阶段放图占位） */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  border:2px solid var(--steel);
  background:var(--panel-1);
  box-shadow:var(--shadow-hard);
}
.media-frame__img{width:100%;height:100%;object-fit:cover;aspect-ratio:16/9}
.media-frame--portrait .media-frame__img{aspect-ratio:9/16}
.media-frame--wide .media-frame__img{aspect-ratio:21/9}
.media-frame__ghost{
  display:flex;
  align-items:center;
  justify-content:center;
  aspect-ratio:16/9;
  background-image:
    linear-gradient(to right,rgba(43,232,200,.14) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(43,232,200,.14) 1px,transparent 1px);
  background-size:28px 28px;
  color:rgba(147,175,196,.85);
  font-family:var(--ff-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
}
.media-frame--portrait .media-frame__ghost{aspect-ratio:9/16}
.media-frame__cap{
  position:absolute;
  left:0;
  bottom:0;
  padding:6px 10px;
  border-top:2px solid var(--cyan);
  background:rgba(4,16,26,.88);
  color:var(--mint);
  font-family:var(--ff-mono);
  font-size:10.5px;
  letter-spacing:.1em;
}

/* 14. scroll progress（由 JS 注入） */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  z-index:120;
  width:0;
  height:3px;
  pointer-events:none;
  background:linear-gradient(90deg,var(--cyan),var(--mint));
  box-shadow:0 0 12px rgba(43,232,200,.6);
}

/* 15. 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;
  }
  .panel:hover,.btn:hover{transform:none}
}