/* ============================================================
   KAIYUN赛场 · 共享样式表 /assets/site.css
   1 重置  2 设计令牌  3 排版  4 布局  5 按钮  6 标签与状态
   7 区块与图形  8 页头浮岛  9 页脚  10 回顶  11 无障碍
   ============================================================ */

/* ---------- 1 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0}
a{color:inherit;text-decoration:none}
[hidden]{display:none!important}

/* ---------- 2 设计令牌 ---------- */
:root{
  --paper:#F7F8F6;
  --paper-2:#E8EBE7;
  --ink:#0F1115;
  --turf-deep:#0B3D2E;
  --turf:#1FBF6B;
  --night:#123A6B;
  --night-bright:#1B5FC1;
  --ref-yellow:#FFD23F;
  --card-red:#E0322B;
  --muted:#5A6360;
  --rule:#CFD5CE;
  --hair:rgba(15,17,21,.14);
  --on-dark:rgba(247,248,246,.78);
  --on-dark-soft:rgba(247,248,246,.6);

  --font-head:"Arial Narrow","Helvetica Neue",Helvetica,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",Helvetica,Arial,system-ui,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --shell-w:1200px;
  --gutter:20px;
  --t-fast:180ms;
  --t-mid:220ms;
  --tick-h:12px;
}

/* ---------- 3 排版 ---------- */
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:800;
  line-height:1.2;
  letter-spacing:-.01em;
}
h1{font-size:clamp(28px,4.6vw,44px)}
h2{font-size:clamp(23px,3.2vw,34px)}
h3{font-size:clamp(20px,2.4vw,28px)}
h4{font-size:clamp(18px,2vw,24px)}
p+p{margin-top:1.2em}
strong{font-weight:700}
code,kbd,samp{font-family:var(--font-mono);font-size:.92em}
.lead{
  font-size:19px;
  line-height:1.7;
  color:var(--muted);
  max-width:640px;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--night-bright);
}
.eyebrow::before{
  content:"";
  width:18px;
  height:2px;
  background:currentColor;
  flex:0 0 auto;
}
.sec-num{
  display:block;
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(38px,6vw,60px);
  line-height:.9;
  letter-spacing:-.02em;
  color:var(--night);
}
.rule-v{
  border-left:1px solid var(--rule);
  padding-left:20px;
}
.crumb{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.02em;
  color:var(--muted);
}
.crumb a:hover{color:var(--night-bright)}
.crumb__sep::before{content:"/"}

/* ---------- 4 布局 ---------- */
.shell{
  width:min(100% - (var(--gutter) * 2), var(--shell-w));
  margin-inline:auto;
}
.prose{max-width:640px}
.prose p{font-size:17px;line-height:1.75}
.grid{display:grid;gap:24px}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* ---------- 5 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 18px;
  border:1px solid var(--ink);
  border-radius:2px;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-head);
  font-weight:700;
  font-size:15px;
  line-height:1.2;
  letter-spacing:.01em;
  cursor:pointer;
  transition:transform var(--t-fast) linear,background-color var(--t-fast) linear,box-shadow var(--t-fast) linear;
}
.btn:hover{
  transform:translateY(-2px);
  box-shadow:inset 0 0 0 1px var(--ink);
}
.btn:active{transform:translateY(0)}
.btn--primary{
  background:var(--turf);
  border-color:var(--ink);
  color:var(--ink);
}
.btn--primary:hover{background:#25d276}
.btn--ghost{
  background:transparent;
  border-color:currentColor;
  color:var(--ink);
}
.btn--sm{
  padding:7px 12px;
  font-size:13px;
  letter-spacing:.02em;
}

/* ---------- 6 标签与状态 ---------- */
.tag{
  display:inline-block;
  padding:2px 8px;
  border:1px solid currentColor;
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:500;
  letter-spacing:.02em;
  line-height:1.5;
  color:var(--muted);
}
.tag--yellow{background:var(--ref-yellow);color:var(--ink);border-color:var(--ink)}
.tag--green{background:var(--turf);color:var(--ink);border-color:var(--ink)}
.tag--red{background:var(--card-red);color:var(--paper);border-color:var(--card-red)}
.tag--ink{background:var(--ink);color:var(--paper);border-color:var(--ink)}

/* ---------- 7 区块与图形 ---------- */
.plate{
  background:var(--paper);
  border:1px solid var(--rule);
  border-radius:2px;
  padding:22px;
  box-shadow:6px 6px 0 var(--paper-2);
}
.plate--ink{
  background:var(--ink);
  border-color:var(--ink);
  color:var(--paper);
  box-shadow:6px 6px 0 var(--ref-yellow);
}
.panel{
  background:var(--night);
  border-radius:2px;
  padding:24px;
  color:var(--paper);
}
.panel--turf{background:var(--turf-deep)}
.panel--paper{background:var(--paper-2);color:var(--ink)}
.media-frame{
  position:relative;
  overflow:hidden;
  border:1px solid var(--rule);
  border-radius:2px;
  background:var(--paper-2);
  aspect-ratio:16/9;
}
.media-frame>img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame__note{
  position:absolute;
  left:0;
  bottom:0;
  max-width:100%;
  padding:4px 10px;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.02em;
  line-height:1.6;
}
.tabs__list{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  padding-bottom:10px;
  border-bottom:1px solid var(--rule);
}
.tabs__tab{
  padding:8px 14px;
  border:1px solid var(--rule);
  border-radius:2px;
  background:var(--paper);
  color:var(--muted);
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:500;
  letter-spacing:.02em;
  cursor:pointer;
  transition:background-color var(--t-fast) linear,color var(--t-fast) linear,border-color var(--t-fast) linear;
}
.tabs__tab:hover{
  color:var(--ink);
  border-color:var(--ink);
}
.tabs__tab[aria-selected="true"]{
  background:var(--ink);
  border-color:var(--ink);
  color:var(--paper);
}
.tabs__panel{padding-top:22px}
.reveal{transition:opacity 380ms linear,transform 380ms linear}
@media (scripting:enabled){
  .reveal{opacity:0;transform:translateY(14px)}
  .reveal.is-in{opacity:1;transform:none}
}

/* ---------- 8 页头浮岛 ---------- */
.deck{
  position:sticky;
  top:0;
  z-index:60;
}
.skip-link{
  position:absolute;
  left:12px;
  top:-64px;
  z-index:90;
  padding:10px 16px;
  border-radius:0 0 2px 2px;
  background:var(--ink);
  color:var(--paper);
  font-size:14px;
  line-height:1.2;
  transition:top var(--t-fast) linear;
}
.skip-link:focus{top:var(--tick-h)}

.ticker{
  position:relative;
  height:var(--tick-h);
  background:var(--ink);
  overflow:hidden;
}
.ticker::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:repeating-linear-gradient(90deg,rgba(247,248,246,.3) 0 1px,transparent 1px 32px);
  pointer-events:none;
}
.ticker__progress{
  position:absolute;
  left:0;
  bottom:0;
  width:0;
  height:4px;
  background:var(--turf);
  transition:width 120ms linear;
}

.masthead{
  position:relative;
  background:var(--paper);
  border-bottom:1px solid var(--ink);
  padding:10px 0;
}
.masthead__inner{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:16px;
  width:min(100% - (var(--gutter) * 2), var(--shell-w));
  margin-inline:auto;
}
.brand{
  justify-self:start;
  display:flex;
  align-items:baseline;
  gap:12px;
  min-width:0;
}
.brand__mark{
  display:inline-block;
  padding-left:10px;
  border-left:4px solid var(--turf);
  font-family:var(--font-head);
  font-weight:800;
  font-size:20px;
  line-height:1.15;
  letter-spacing:-.03em;
  white-space:nowrap;
}
.brand__tagline{
  font-size:12px;
  line-height:1.5;
  color:var(--muted);
  letter-spacing:.02em;
  max-width:18ch;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}

.nav-pill{
  justify-self:center;
  padding:5px;
  border-radius:999px;
  background:var(--night);
}
.nav-pill__list{
  display:flex;
  align-items:center;
  gap:2px;
}
.nav-pill__link{
  display:block;
  padding:8px 14px;
  border-radius:999px;
  color:var(--on-dark);
  font-size:14px;
  font-weight:600;
  line-height:1.3;
  white-space:nowrap;
  transition:background-color var(--t-fast) linear,color var(--t-fast) linear;
}
.nav-pill__link:hover{
  background:rgba(247,248,246,.14);
  color:var(--paper);
}
.nav-pill__link[aria-current="page"]{
  background:var(--turf);
  color:var(--ink);
}

.masthead__tools{
  justify-self:end;
  display:flex;
  align-items:center;
  gap:10px;
}
.round-meter{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  border:1px solid var(--ink);
  border-radius:2px;
  background:var(--paper);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.02em;
  line-height:1.5;
  white-space:nowrap;
}
.round-meter__pip{
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--turf);
  flex:0 0 auto;
  animation:pip-blink 2s steps(2,end) infinite;
}
@keyframes pip-blink{
  0%,49%{opacity:1}
  50%,100%{opacity:.25}
}
.round-meter__label{color:var(--muted);font-size:11px;letter-spacing:.08em}
.round-meter__num{font-weight:700;color:var(--ink)}
.round-meter__sep{color:var(--rule)}
.round-meter__clock{font-weight:700;color:var(--night-bright)}

.nav-toggle{
  display:none;
  position:relative;
  width:44px;
  height:38px;
  border:1px solid var(--ink);
  border-radius:2px;
  background:var(--paper);
  cursor:pointer;
}
.nav-toggle__bar{
  position:absolute;
  left:11px;
  right:11px;
  height:2px;
  background:var(--ink);
  transition:transform var(--t-fast) linear,opacity var(--t-fast) linear;
}
.nav-toggle__bar:nth-child(1){top:12px}
.nav-toggle__bar:nth-child(2){top:18px}
.nav-toggle__bar:nth-child(3){top:24px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.deck.is-condensed .brand__tagline{display:none}
.deck.is-condensed .masthead{padding:7px 0}

/* ---------- 9 页脚 ---------- */
.site-foot{
  margin-top:100px;
  background:var(--turf-deep);
  color:var(--paper);
  border-top:6px solid var(--ink);
}
.site-foot__top{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,2fr);
  gap:40px;
  padding:56px 0 40px;
  border-bottom:1px solid rgba(247,248,246,.18);
}
.foot-brand__mark{
  padding-left:10px;
  border-left:4px solid var(--turf);
  font-family:var(--font-head);
  font-weight:800;
  font-size:24px;
  line-height:1.15;
  letter-spacing:-.03em;
}
.foot-brand__note{
  margin-top:14px;
  max-width:30ch;
  font-size:14px;
  line-height:1.7;
  color:var(--on-dark);
}
.foot-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
}
.foot-col__title{
  margin-bottom:12px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--ref-yellow);
  line-height:1.4;
}
.foot-list li+li{margin-top:2px}
.foot-list a{
  display:inline-block;
  padding:3px 0;
  font-size:15px;
  line-height:1.8;
  color:var(--on-dark);
  transition:color var(--t-fast) linear;
}
.foot-list a:hover{
  color:var(--paper);
  text-decoration:underline;
  text-underline-offset:4px;
}
.site-foot__contact{
  padding:36px 0;
  border-bottom:1px solid rgba(247,248,246,.18);
}
.foot-contact{display:grid;gap:10px}
.foot-contact__row{
  display:grid;
  grid-template-columns:96px minmax(0,1fr);
  gap:16px;
  font-size:15px;
  line-height:1.7;
}
.foot-contact__row dt{
  padding-top:4px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--on-dark-soft);
}
.foot-contact__row dd{
  margin:0;
  word-break:break-word;
}
.foot-contact__note{
  margin-top:18px;
  max-width:70ch;
  font-size:13px;
  line-height:1.7;
  color:var(--on-dark-soft);
}
.site-foot__bar{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:12px;
  padding:20px 0 32px;
}
.legal-line{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.02em;
  line-height:1.6;
  color:var(--on-dark-soft);
}

/* ---------- 10 回顶 ---------- */
.to-top{
  position:fixed;
  right:20px;
  bottom:20px;
  z-index:70;
  padding:10px 14px;
  border:1px solid var(--paper);
  border-radius:2px;
  background:var(--night);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.02em;
  cursor:pointer;
  opacity:0;
  transform:translateY(8px);
  pointer-events:none;
  transition:opacity var(--t-fast) linear,transform var(--t-fast) linear;
}
.to-top.is-on{
  opacity:1;
  transform:none;
  pointer-events:auto;
}
.to-top:hover{border-width:2px}

/* ---------- 11 无障碍与响应式 ---------- */
:focus-visible{
  outline:3px solid var(--night-bright);
  outline-offset:3px;
}
.site-foot :focus-visible,
.to-top:focus-visible{
  outline-color:var(--ref-yellow);
}

@media (max-width:1200px){
  .brand__tagline{display:none}
}
@media (max-width:1080px){
  .nav-pill__link{padding:7px 10px;font-size:13px}
  .round-meter__label{display:none}
}

@media (max-width:900px){
  .masthead__inner{
    display:flex;
    align-items:center;
    gap:12px;
  }
  .brand{flex:1 1 auto;min-width:0}
  .brand__mark{font-size:18px;border-left-width:3px;padding-left:8px}
  .nav-toggle{display:block}
  .masthead__tools{margin-left:auto}
  .masthead__tools .btn{display:none}
  .round-meter{padding:3px 7px;font-size:11px}
  .round-meter__sep{display:none}

  .nav-pill{
    position:absolute;
    top:calc(100% + 6px);
    left:var(--gutter);
    right:var(--gutter);
    display:none;
    padding:10px;
    border-radius:6px;
    box-shadow:6px 6px 0 rgba(15,17,21,.18);
  }
  .nav-pill[data-open]{display:block}
  .nav-pill__list{
    flex-direction:column;
    align-items:stretch;
    gap:4px;
  }
  .nav-pill__link{
    padding:11px 14px;
    border-radius:3px;
    font-size:15px;
  }

  .site-foot__top{
    grid-template-columns:1fr;
    gap:32px;
    padding:44px 0 32px;
  }
  .foot-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
  .site-foot{margin-top:72px}
}

@media (max-width:860px){
  .grid--2,
  .grid--3{grid-template-columns:1fr}
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .prose{max-width:100%}
}
@media (max-width:600px){
  :root{--gutter:16px}
  .grid--4{grid-template-columns:1fr}
  .grid{gap:18px}
  .foot-contact__row{grid-template-columns:1fr;gap:2px}
  .foot-contact__row dt{padding-top:0}
  .to-top{right:14px;bottom:14px}
  .foot-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  .reveal{opacity:1!important;transform:none!important}
  .btn:hover{transform:none}
}