/* ============================================================
   AK赛场 · /assets/site.css
   共享外壳：reset / 变量 / 排版 / 页头 / 页脚 / 通用组件
   ============================================================ */

:root{
  --night:#0B1B33;
  --night-2:#142B4A;
  --night-3:#08121F;
  --crimson:#B22234;
  --gold:#E8A33D;
  --green:#2E7D5B;
  --white:#F4F1EA;
  --steel:#9FB3C8;
  --ink:#0A0F17;
  --sand:#D9C7A7;

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Consolas,"Courier New",monospace;

  --line:2px;
  --shadow-hard:6px 6px 0 var(--ink);
  --shadow-soft:0 16px 44px rgba(4,10,20,.55);
  --container:1200px;
  --container-wide:1380px;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  min-height:100vh;
  background-color:var(--night);
  background-image:
    radial-gradient(1100px 620px at 12% -8%, rgba(232,163,61,.08), transparent 62%),
    radial-gradient(900px 520px at 88% -4%, rgba(178,34,52,.12), transparent 66%);
  background-repeat:no-repeat;
  color:var(--white);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.85;
  letter-spacing:.02em;
}
img{max-width:100%;display:block}
a{color:inherit}
button{font:inherit;color:inherit}
[id]{scroll-margin-top:150px}
:focus-visible{outline:3px solid var(--gold);outline-offset:3px;border-radius:2px}

/* ---------- 基础排版 ---------- */
h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;line-height:1.14;letter-spacing:-.01em}
h1{font-size:clamp(34px,5vw,64px);line-height:1.06}
h2{font-size:clamp(26px,3.4vw,36px)}
h3{font-size:clamp(20px,2.2vw,24px);font-family:var(--font-body);font-weight:700;letter-spacing:.02em}
p{margin:0 0 1.1em}
p:last-child{margin-bottom:0}
strong{color:var(--white);font-weight:700}
.mono{font-family:var(--font-mono);font-weight:500;letter-spacing:.06em}
.eyebrow{display:inline-block;font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold)}
.lede{font-size:clamp(17px,1.5vw,20px);line-height:1.9;color:var(--sand)}
.rule{height:2px;border:0;margin:clamp(28px,4vw,46px) 0;background:linear-gradient(90deg,var(--crimson) 0 28%,var(--gold) 28% 55%,rgba(159,179,200,.22) 55% 100%)}
.endnote{border-left:4px solid var(--crimson);padding:4px 0 4px 16px;color:var(--sand);font-size:15px;line-height:1.8}

/* ---------- 布局工具 ---------- */
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}
.container--wide{max-width:var(--container-wide)}
.section{padding:clamp(46px,7vw,96px) 0}
.section--panel{background:var(--night-2);border-top:var(--line) solid var(--ink);border-bottom:var(--line) solid var(--ink)}
.stack{display:flex;flex-direction:column;gap:clamp(18px,2.4vw,30px)}
.grid{display:grid;gap:clamp(18px,2.4vw,30px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,.9fr) minmax(0,1.7fr)}
.rail-sticky{position:sticky;top:150px;align-self:start}

.section-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 18px;margin-bottom:clamp(20px,3vw,30px)}
.section-head__index{font-family:var(--font-mono);font-size:13px;letter-spacing:.16em;color:var(--gold)}
.section-head__title{margin:0}
.section-head__note{flex:1 1 260px;font-size:14px;color:var(--steel)}

/* ---------- 面板 / 说明牌 ---------- */
.panel{background:var(--night-2);border:var(--line) solid var(--ink);box-shadow:var(--shadow-hard);padding:clamp(20px,3vw,34px)}
.panel--sand{background:var(--sand);color:var(--ink)}
.panel--flat{background:transparent;border:0;box-shadow:none;padding:0}
.panel:hover{box-shadow:8px 8px 0 var(--ink)}
.plaque{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;background:var(--sand);color:var(--ink);border:var(--line) solid var(--ink);box-shadow:3px 3px 0 var(--ink);font-family:var(--font-mono);font-size:12px;letter-spacing:.12em}
.stat-float{display:inline-block;padding:6px 12px;background:var(--gold);color:var(--ink);border:var(--line) solid var(--ink);box-shadow:4px 4px 0 var(--ink);font-family:var(--font-mono);font-weight:500;transform:rotate(-1.4deg)}

/* ---------- 图片容器（页面阶段放置占位图） ---------- */
.media-frame{
  position:relative;display:block;width:100%;overflow:hidden;
  border:var(--line) solid var(--ink);box-shadow:var(--shadow-hard);
  background:linear-gradient(145deg,#10314F 0%,#0B1B33 52%,#0A1626 100%);
}
.media-frame::after{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(180deg,rgba(11,27,51,0) 42%,rgba(10,15,23,.72) 100%)}
.media-frame img{position:relative;z-index:1;width:100%;height:100%;object-fit:cover;filter:saturate(.94) contrast(1.05)}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame--banner{aspect-ratio:21/9}
.media-frame__label{position:absolute;z-index:2;left:14px;bottom:14px;padding:6px 10px;background:var(--sand);color:var(--ink);border:var(--line) solid var(--ink);font-family:var(--font-mono);font-size:12px;letter-spacing:.1em}

/* ---------- 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 20px;
  font-family:var(--font-body);font-weight:700;font-size:15px;letter-spacing:.06em;
  text-decoration:none;cursor:pointer;
  background:var(--white);color:var(--ink);
  border:var(--line) solid var(--ink);border-radius:2px;
  box-shadow:4px 4px 0 var(--ink);
  transition:transform .18s ease,box-shadow .18s ease,background-color .18s ease,color .18s ease,border-color .18s ease;
}
.btn:hover{transform:translate(-1px,-1px);box-shadow:6px 6px 0 var(--ink)}
.btn:active{transform:translate(2px,2px);box-shadow:2px 2px 0 var(--ink)}
.btn--gold{background:var(--gold)}
.btn--gold:hover{background:#F3B658}
.btn--crimson{background:var(--crimson);color:var(--white)}
.btn--ghost{background:transparent;color:var(--white);border-color:var(--steel);box-shadow:none}
.btn--ghost:hover{background:var(--night-2);border-color:var(--gold);color:var(--gold);box-shadow:none;transform:none}

/* ---------- 面包屑 ---------- */
.breadcrumb{max-width:var(--container);margin:0 auto;padding:20px 24px 0}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:0;padding:0;list-style:none;font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;color:var(--steel)}
.breadcrumb__list li+li::before{content:"/";margin-right:8px;color:var(--gold)}
.breadcrumb__link{color:var(--steel);text-decoration:none}
.breadcrumb__link:hover{color:var(--gold)}
.breadcrumb__current{color:var(--white)}

/* ---------- 提示浮标 ---------- */
.tip{position:relative;display:inline-block;cursor:help;border-bottom:1px dashed rgba(232,163,61,.55)}
.tip::after{
  content:attr(data-tip);
  position:absolute;left:50%;bottom:calc(100% + 10px);
  transform:translate(-50%,6px);
  padding:6px 10px;white-space:nowrap;
  background:var(--ink);color:var(--gold);
  border:1px solid var(--gold);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  opacity:0;pointer-events:none;
  transition:opacity .2s ease,transform .2s ease;
  z-index:20;
}
.tip:hover::after,.tip:focus-visible::after{opacity:1;transform:translate(-50%,0)}

/* ============================================================
   页头
   ============================================================ */
.skip-link{
  position:absolute;left:16px;top:-80px;z-index:200;
  padding:10px 16px;
  background:var(--gold);color:var(--ink);
  font-weight:700;text-decoration:none;
  border:var(--line) solid var(--ink);box-shadow:4px 4px 0 var(--ink);
  transition:top .2s ease;
}
.skip-link:focus{top:12px}

.site-header{
  position:sticky;top:0;z-index:80;
  background:linear-gradient(180deg,#0C1F3A 0%,#0B1B33 70%,#0A1729 100%);
  border-bottom:var(--line) solid var(--ink);
  box-shadow:0 18px 42px rgba(4,10,20,.55);
}
.site-header::before{
  content:"";display:block;height:4px;
  background:linear-gradient(90deg,var(--crimson) 0 34%,var(--gold) 34% 67%,var(--green) 67% 100%);
}

.masthead{
  display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;gap:20px;
  max-width:var(--container);margin:0 auto;
  padding:18px 24px 14px;
}
.masthead__rail{display:flex;flex-direction:column;gap:4px;font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--steel)}
.masthead__rail--left{align-items:flex-start;text-align:left}
.masthead__rail--right{align-items:flex-end;text-align:right}
.rail-label{color:var(--steel)}
.rail-value{color:var(--white);font-size:13px}

.masthead__brand{text-align:center}
.brand{display:inline-flex;flex-direction:column;align-items:center;gap:8px;text-decoration:none;color:var(--white)}
.brand__name{
  position:relative;padding-bottom:10px;
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(30px,4.6vw,54px);line-height:1.05;letter-spacing:-.02em;
}
.brand__name::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:4px;
  background:linear-gradient(90deg,var(--crimson) 0 56%,var(--gold) 56% 100%);
  transform-origin:left center;transition:transform .3s ease;
}
.brand:hover .brand__name::after{transform:scaleX(1.06)}
.brand__tagline{font-size:12px;letter-spacing:.24em;color:var(--steel)}

.rank-chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 12px;
  background:rgba(20,43,74,.65);
  border:var(--line) solid var(--steel);
  color:var(--white);text-decoration:none;
  font-family:var(--font-body);font-weight:700;font-size:13px;letter-spacing:.08em;
  transition:border-color .2s ease,color .2s ease,background-color .2s ease;
}
.rank-chip .mono{color:var(--gold)}
.rank-chip:hover{border-color:var(--gold);color:var(--gold);background:rgba(232,163,61,.09)}

.nav-bar{
  position:relative;
  display:flex;align-items:center;justify-content:center;gap:16px;
  max-width:var(--container);margin:0 auto;padding:0 24px;
  border-top:1px solid rgba(159,179,200,.18);
}
.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:10px 14px;
  background:transparent;color:var(--white);
  border:var(--line) solid var(--steel);
  font-weight:700;font-size:14px;letter-spacing:.1em;cursor:pointer;
  transition:border-color .2s ease,color .2s ease,background-color .2s ease;
}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px}
.nav-toggle__bars span{display:block;width:18px;height:2px;background:currentColor}
.nav-toggle:hover{border-color:var(--gold);color:var(--gold)}
.nav-toggle[aria-expanded="true"]{background:var(--crimson);border-color:var(--ink);color:var(--white)}

.site-nav{display:flex;justify-content:center}
.site-nav__list{display:flex;align-items:center;gap:4px;margin:0;padding:0;list-style:none}
.site-nav__item{display:block}
.nav-link{
  position:relative;display:block;
  padding:14px 14px;
  color:var(--steel);text-decoration:none;
  font-family:var(--font-body);font-weight:700;font-size:15px;letter-spacing:.06em;
  transition:color .2s ease,background-color .2s ease,box-shadow .2s ease;
}
.nav-link::after{
  content:"";position:absolute;left:14px;right:14px;bottom:10px;height:2px;
  background:var(--gold);transform:scaleX(0);transform-origin:left center;
  transition:transform .28s ease;
}
.nav-link:hover{color:var(--white)}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{
  background:var(--crimson);color:var(--white);
  box-shadow:4px 4px 0 var(--ink);
}
.nav-link[aria-current="page"]::after{display:none}

.nav-cta{position:absolute;right:24px;top:50%;transform:translateY(-50%)}
.nav-cta:hover{transform:translate(calc(-50% + 0px),-50%) translate(-1px,-1px)}
.nav-cta{transform:translateY(-50%)}
.nav-cta:hover{transform:translateY(-50%) translate(-1px,-1px)}

.scroll-progress{
  display:block;height:3px;width:100%;
  background:var(--gold);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .12s linear;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  margin-top:clamp(56px,8vw,110px);
  background:var(--night-3);
  border-top:var(--line) solid var(--ink);
  box-shadow:inset 0 4px 0 rgba(232,163,61,.28);
  color:var(--steel);
  font-size:15px;
}
.footer__inner{
  display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1.6fr);
  gap:clamp(28px,4vw,60px);
  max-width:var(--container);margin:0 auto;
  padding:clamp(38px,6vw,72px) 24px 0;
}
.footer__wordmark{
  display:inline-block;text-decoration:none;
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(28px,3.6vw,40px);line-height:1.1;letter-spacing:-.01em;
  color:var(--white);
  border-bottom:4px solid var(--crimson);
  padding-bottom:8px;
}
.footer__motto{margin:14px 0 0;max-width:34ch;color:var(--steel)}
.footer__sign{margin:12px 0 0;font-size:12px;letter-spacing:.12em;color:var(--gold)}
.footer__nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,3vw,32px)}
.footer__col-title{
  margin:0 0 14px;font-family:var(--font-body);font-weight:700;
  font-size:13px;letter-spacing:.18em;color:var(--gold);
}
.footer__list{display:flex;flex-direction:column;gap:10px;margin:0;padding:0;list-style:none}
.footer__link{
  position:relative;display:inline-block;padding-bottom:3px;
  color:var(--white);text-decoration:none;font-size:15px;
  transition:color .2s ease;
}
.footer__link::after{
  content:"";position:absolute;left:0;bottom:0;width:100%;height:2px;
  background:var(--gold);transform:scaleX(0);transform-origin:left center;
  transition:transform .26s ease;
}
.footer__link:hover{color:var(--gold)}
.footer__link:hover::after{transform:scaleX(1)}

.footer__contact{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));
  gap:clamp(18px,3vw,32px);
  max-width:var(--container);margin:clamp(30px,4vw,52px) auto 0;
  padding:28px 24px 0;
  border-top:1px solid rgba(159,179,200,.2);
}
.contact-item{display:flex;flex-direction:column;align-items:flex-start;gap:8px}
.contact-item__label{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--steel)}
.contact-item__value{color:var(--white);font-size:16px;word-break:break-word}
.contact-note{grid-column:1/-1;margin:0;font-size:13px;line-height:1.8;color:var(--steel)}
.copy-btn{
  padding:7px 12px;
  background:transparent;color:var(--steel);
  border:1px solid var(--steel);border-radius:2px;
  font-family:var(--font-body);font-weight:700;font-size:12px;letter-spacing:.1em;
  cursor:pointer;
  transition:border-color .2s ease,color .2s ease,background-color .2s ease;
}
.copy-btn:hover{border-color:var(--gold);color:var(--gold)}
.copy-btn[data-copied="true"]{background:var(--green);border-color:var(--ink);color:var(--white)}
.copy-status{min-height:1.2em;font-size:12px;letter-spacing:.06em;color:var(--green)}

.footer__base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;
  max-width:var(--container);margin:26px auto 0;padding:22px 24px 34px;
  border-top:1px solid rgba(159,179,200,.16);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;color:var(--steel);
}
.footer__copyright{color:var(--steel)}
.footer__icp{color:var(--gold)}

/* ============================================================
   进场动效
   ============================================================ */
html.has-js [data-reveal]{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
html.has-js [data-reveal].is-visible{opacity:1;transform:none}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1080px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--split{grid-template-columns:minmax(0,1fr)}
  .rail-sticky{position:static;top:auto}
}

@media (max-width:900px){
  body{font-size:16px}
  .nav-bar{justify-content:space-between;padding:10px 16px}
  .nav-toggle{display:inline-flex}
  .nav-cta{position:static;transform:none}
  .nav-cta:hover{transform:translate(-1px,-1px)}
  .site-nav{
    display:none;
    position:absolute;left:0;right:0;top:100%;
    background:var(--night-2);
    border-top:var(--line) solid var(--ink);
    border-bottom:var(--line) solid var(--ink);
    box-shadow:var(--shadow-soft);
    padding:8px 16px 16px;
    z-index:90;
  }
  .site-nav[data-open]{display:block}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__item{border-bottom:1px solid rgba(159,179,200,.14)}
  .site-nav__item:last-child{border-bottom:0}
  .nav-link{padding:15px 10px}
  .nav-link::after{left:10px;right:10px;bottom:9px}
  .nav-link[aria-current="page"]{box-shadow:none}
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .footer__inner{grid-template-columns:minmax(0,1fr)}
  .footer__nav{grid-template-columns:repeat(2,minmax(0,1fr))}
  [id]{scroll-margin-top:120px}
  .rail-sticky{top:auto}
}

@media (max-width:720px){
  .masthead{grid-template-columns:minmax(0,1fr);gap:12px;padding:16px 16px 12px}
  .masthead__rail--left{display:none}
  .masthead__rail--right{align-items:center;text-align:center}
  .brand__tagline{letter-spacing:.14em;font-size:11px}
  .container,.breadcrumb,.nav-bar{padding-left:16px;padding-right:16px}
  .footer__inner,.footer__contact,.footer__base{padding-left:16px;padding-right:16px}
  .footer__nav{grid-template-columns:minmax(0,1fr)}
  .btn{width:100%;justify-content:center}
  .nav-cta{width:auto}
  .stat-float{transform:none}
}

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