/* =========================================================
   K1赛场 · site.css
   共享基础：令牌、重置、头部、页脚、通用组件
   ========================================================= */

/* ---------- 设计令牌 ---------- */
:root{
  --color-deep:#0B1E3A;
  --color-night:#061226;
  --color-neon:#C6FF00;
  --color-ember:#FF6B35;
  --color-cream:#F5EFE6;
  --color-fog:#BAC8DC;
  --color-white:#FFFFFF;
  --color-red:#FF4D4D;
  --color-violet:#6B4EFF;

  --font-head:'Archivo Black','PingFang SC',sans-serif;
  --font-body:'Inter','PingFang SC','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono','Roboto Mono',monospace;

  --maxw:1320px;
  --radius:4px;
  --sec-y:clamp(56px, 9vw, 112px);
  --header-z:100;
  --drawer-z:120;
  --overlay-z:110;
  --float-z:90;
  --progress-z:300;
  --shadow-hard:4px 4px 0 rgba(6,18,38,.6);
}

/* ---------- 基础重置 ---------- */
*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body{
  margin:0;
  background:var(--color-deep);
  color:var(--color-fog);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img,svg{ max-width:100%; display:block; }
button{ font-family:inherit; }
a{ color:inherit; }
:focus-visible{ outline:3px solid var(--color-neon); outline-offset:2px; }

/* ---------- 通用布局 ---------- */
.container{
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:clamp(16px, 4vw, 32px);
}
.section{ padding-block:var(--sec-y); }
.section--deep{ background:var(--color-deep); color:var(--color-fog); }
.section--night{ background:var(--color-night); }
.section--light{ background:var(--color-cream); color:var(--color-deep); }
.section--light .display-title,
.section--light .section-title{ color:var(--color-deep); }
.section--light .prose{ color:rgba(6,18,38,.78); }
.section--light .kicker{ color:var(--color-ember); }
.section--light .kicker::before{ background:var(--color-ember); box-shadow:0 0 8px rgba(255,107,53,.5); }

/* ---------- 排版组件 ---------- */
.display-title{
  margin:0;
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(2.5rem, 6vw, 5rem);
  line-height:1.08;
  letter-spacing:-.02em;
  color:var(--color-white);
}
.section-title{
  margin:0 0 16px;
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(1.5rem, 3vw, 2.25rem);
  line-height:1.15;
  letter-spacing:-.01em;
  color:var(--color-white);
}
.prose{ margin:0 0 1.5em; color:var(--color-fog); line-height:1.75; font-size:16px; }
.prose a{ color:var(--color-neon); text-decoration:underline; text-underline-offset:3px; }
.data-number{
  margin:0;
  font-family:var(--font-mono);
  font-weight:500;
  font-size:2.2rem;
  line-height:1.2;
  font-variant-numeric:tabular-nums;
  color:var(--color-white);
}
.kicker{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:500;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--color-neon);
}
.kicker::before{
  content:"";
  width:16px;
  height:2px;
  background:var(--color-neon);
  box-shadow:0 0 8px rgba(198,255,0,.7);
}

/* ---------- 通用按钮 ---------- */
.k1-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:12px 22px;
  border-radius:var(--radius);
  font-family:var(--font-body);
  font-size:15px;
  font-weight:700;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  border:2px solid transparent;
  transition:transform .15s ease, box-shadow .15s ease, background-color .15s ease, color .15s ease, border-color .15s ease;
}
.k1-btn--primary{
  background:var(--color-neon);
  color:var(--color-deep);
  box-shadow:var(--shadow-hard);
}
.k1-btn--primary:hover{
  transform:translate(-2px, -2px);
  box-shadow:6px 6px 0 var(--color-ember);
}
.k1-btn--ghost{
  background:transparent;
  border-color:var(--color-fog);
  color:var(--color-white);
}
.k1-btn--ghost:hover{
  border-color:var(--color-neon);
  color:var(--color-neon);
  background:rgba(198,255,0,.06);
}
.k1-btn--small{ padding:8px 14px; font-size:13px; }

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  margin:0 0 16px;
  padding:0;
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  font-size:14px;
  color:var(--color-fog);
}
.breadcrumbs li{ display:flex; align-items:center; gap:8px; }
.breadcrumbs li + li::before{ content:"/"; color:rgba(186,200,220,.4); }
.breadcrumbs a{ color:var(--color-fog); text-decoration:none; }
.breadcrumbs a:hover{ color:var(--color-neon); }
.breadcrumbs [aria-current="page"]{ color:var(--color-white); }

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  border:1px solid rgba(186,200,220,.35);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--color-fog);
}
.tag--orange{ border-color:rgba(255,107,53,.65); color:var(--color-ember); }
.tag--green{ border-color:rgba(198,255,0,.5); color:var(--color-neon); }

/* ---------- 目录型索引列表 ---------- */
.index-list{ list-style:none; margin:0; padding:0; display:grid; gap:2px; }
.index-list li{ display:flex; align-items:baseline; gap:14px; padding:10px 4px; border-bottom:1px dotted rgba(186,200,220,.22); }
.index-name{ font-size:16px; font-weight:700; color:var(--color-white); text-decoration:none; }
.index-name:hover{ color:var(--color-neon); }
.index-dots{ flex:1; border-bottom:1px dotted rgba(186,200,220,.3); transform:translateY(-4px); }
.index-meta{ font-family:var(--font-mono); font-size:12px; color:var(--color-fog); white-space:nowrap; }

/* ---------- 图片容器占位 ---------- */
.img-frame{
  position:relative;
  overflow:hidden;
  border-radius:6px;
  background-color:var(--color-night);
  background-image:linear-gradient(rgba(198,255,0,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(198,255,0,.035) 1px, transparent 1px);
  background-size:26px 26px;
  border:1px solid rgba(186,200,220,.16);
  aspect-ratio:16/9;
}
.img-frame::after{
  content:attr(data-label);
  position:absolute;
  left:14px;
  bottom:12px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--color-neon);
  opacity:.85;
}
.img-frame--4-3{ aspect-ratio:4/3; }
.img-frame--tall{ aspect-ratio:3/4; }

/* ---------- 辅助类 ---------- */
.visually-hidden{
  position:absolute; width:1px; height:1px; padding:0; margin:-1px;
  overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap; border:0;
}
html.nav-lock{ overflow:hidden; }

/* ---------- 跳转链接 · 滚动进度 · 返回顶部 ---------- */
.skip-link{
  position:fixed;
  top:12px; left:12px;
  z-index:1000;
  background:var(--color-neon);
  color:var(--color-deep);
  font-weight:700;
  font-size:14px;
  padding:10px 16px;
  border-radius:var(--radius);
  text-decoration:none;
  transform:translateY(-200%);
  transition:transform .2s ease;
}
.skip-link:focus{ transform:translateY(0); }
.skip-link:focus-visible{ outline:3px solid var(--color-white); }

.scroll-progress{
  position:fixed;
  top:0; left:0; right:0;
  height:3px;
  z-index:var(--progress-z);
  pointer-events:none;
}
.scroll-progress span{
  display:block;
  height:100%;
  width:100%;
  background:var(--color-neon);
  transform:scaleX(0);
  transform-origin:0 50%;
}

.back-top{
  position:fixed;
  right:22px; bottom:22px;
  z-index:var(--float-z);
  width:48px; height:48px;
  border-radius:50%;
  background:var(--color-deep);
  color:var(--color-white);
  border:1px solid var(--color-neon);
  box-shadow:0 0 0 4px rgba(198,255,0,.12), 0 8px 18px rgba(6,18,38,.4);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.06em;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(12px);
  transition:opacity .2s ease, transform .2s ease, visibility .2s ease;
}
.back-top:hover{ background:var(--color-neon); color:var(--color-deep); }
.back-top.is-visible{ opacity:1; visibility:visible; transform:translateY(0); }

/* ---------- 滚动显现 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .35s ease, transform .35s ease;
}
[data-reveal].is-revealed{ opacity:1; transform:none; }

/* ---------- 头部命令栏 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:var(--header-z);
  background:rgba(11,30,58,.94);
  border-bottom:1px solid rgba(186,200,220,.14);
}
.header-topbar{
  background:var(--color-night);
  border-bottom:1px dashed rgba(198,255,0,.18);
}
.header-topbar-inner{
  max-width:var(--maxw);
  margin-inline:auto;
  padding:6px clamp(16px, 4vw, 32px);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
}
.header-status{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--color-fog);
}
.status-dot{
  width:7px; height:7px;
  border-radius:50%;
  background:var(--color-neon);
  box-shadow:0 0 10px rgba(198,255,0,.9);
  animation:k1pulse 2.4s ease infinite;
}
@keyframes k1pulse{
  0%,100%{ opacity:1; }
  50%{ opacity:.35; }
}
.header-slogan{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--color-neon);
}
.header-main{ position:relative; }
.header-inner{
  max-width:var(--maxw);
  margin-inline:auto;
  padding:10px clamp(16px, 4vw, 32px);
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;
  gap:16px;
  min-height:72px;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
}
.brand-mark{
  width:42px; height:42px;
  display:grid;
  place-items:center;
  background:var(--color-neon);
  color:var(--color-deep);
  font-family:var(--font-mono);
  font-weight:900;
  font-size:17px;
  letter-spacing:-.04em;
  border-radius:var(--radius);
  clip-path:polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  box-shadow:0 2px 0 rgba(6,18,38,.55);
  flex:0 0 auto;
}
.brand-text{ display:flex; flex-direction:column; line-height:1.2; }
.brand-name{
  font-family:var(--font-head);
  font-weight:900;
  font-size:19px;
  letter-spacing:.02em;
  color:var(--color-white);
}
.brand-sub{
  font-size:11px;
  letter-spacing:.08em;
  color:var(--color-fog);
  white-space:nowrap;
}
.site-nav{ justify-self:center; }
.nav-list{ list-style:none; margin:0; padding:0; display:flex; gap:2px; }
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 12px;
  color:var(--color-fog);
  font-size:14px;
  font-weight:500;
  letter-spacing:.02em;
  text-decoration:none;
  border-radius:var(--radius);
  transition:color .16s ease, background-color .16s ease;
}
.nav-link:hover{ color:var(--color-white); background:rgba(198,255,0,.07); }
.nav-link[aria-current="page"]{ color:var(--color-white); }
.nav-link[aria-current="page"]::before{
  content:"";
  width:6px; height:6px;
  background:var(--color-neon);
  box-shadow:0 0 8px rgba(198,255,0,.8);
}
.nav-link::after{
  content:attr(data-index);
  position:absolute;
  top:-12px;
  left:50%;
  transform:translateX(-50%);
  font-family:var(--font-mono);
  font-size:9px;
  color:var(--color-neon);
  opacity:0;
  transition:opacity .15s ease;
  pointer-events:none;
}
.nav-link:hover::after{ opacity:1; }
.header-actions{
  justify-self:end;
  display:flex;
  align-items:center;
  gap:8px;
}
.header-util-link{
  font-family:var(--font-body);
  font-size:13px;
  font-weight:500;
  color:var(--color-fog);
  text-decoration:none;
  padding:7px 12px;
  border:1px solid rgba(186,200,220,.22);
  border-radius:var(--radius);
  transition:border-color .16s ease, color .16s ease;
}
.header-util-link:hover{ border-color:var(--color-neon); color:var(--color-neon); }
.nav-toggle{ display:none; }
.nav-drawer-head{ display:none; }
.nav-overlay{ display:none; }

@media (max-width:1100px){
  .brand-sub{ display:none; }
  .header-util-link{ display:none; }
  .nav-link{ font-size:13px; padding:10px 8px; }
}

/* ---------- 移动端抽屉导航 ---------- */
@media (max-width:860px){
  .header-inner{ grid-template-columns:minmax(0,1fr) auto; }
  .header-topbar-inner{ justify-content:flex-start; }
  .header-slogan{ display:none; }
  .header-util-link{ display:none; }
  .brand-sub{ display:none; }

  .site-nav{
    position:fixed;
    top:0; right:0;
    height:100dvh;
    width:min(320px, 86vw);
    z-index:var(--drawer-z);
    background:var(--color-night);
    border-left:1px solid rgba(198,255,0,.25);
    padding:28px 22px;
    overflow-y:auto;
    transform:translateX(100%);
    visibility:hidden;
    transition:transform .3s ease, visibility 0s linear .3s;
    display:flex;
    flex-direction:column;
  }
  .site-nav[data-open="true"]{
    transform:translateX(0);
    visibility:visible;
    transition:transform .3s ease, visibility 0s;
  }
  .nav-drawer-head{
    display:flex;
    align-items:center;
    justify-content:space-between;
    margin-bottom:18px;
    padding-bottom:14px;
    border-bottom:1px solid rgba(198,255,0,.2);
  }
  .nav-drawer-title{
    font-family:var(--font-mono);
    font-size:12px;
    letter-spacing:.18em;
    color:var(--color-neon);
  }
  .nav-drawer-close{
    width:36px; height:36px;
    border:1px solid rgba(186,200,220,.25);
    background:transparent;
    color:var(--color-white);
    font-size:20px;
    line-height:1;
    border-radius:var(--radius);
    cursor:pointer;
    display:grid;
    place-items:center;
  }
  .nav-drawer-close:hover{ background:var(--color-ember); border-color:var(--color-ember); }
  .nav-list{ flex-direction:column; gap:2px; }
  .nav-link{
    width:100%;
    padding:14px 10px;
    font-size:16px;
    border-bottom:1px solid rgba(186,200,220,.08);
  }
  .nav-link::after{ display:none; }
  .nav-overlay{
    display:block;
    position:fixed;
    inset:0;
    z-index:var(--overlay-z);
    background:rgba(6,18,38,.62);
    opacity:0;
    pointer-events:none;
    transition:opacity .25s ease;
  }
  .nav-overlay.is-open{ opacity:1; pointer-events:auto; }
  .nav-toggle{
    display:inline-flex;
    flex-direction:column;
    align-items:center;
    justify-content:center;
    gap:5px;
    width:42px; height:42px;
    background:transparent;
    border:1px solid rgba(186,200,220,.25);
    border-radius:var(--radius);
    cursor:pointer;
  }
  .nav-toggle-bar{
    width:20px; height:2px;
    background:var(--color-white);
    display:block;
    transition:transform .2s ease;
  }
  .nav-toggle:hover .nav-toggle-bar{ background:var(--color-neon); }
}

@media (max-width:560px){
  .brand-sub{ display:none; }
  .back-top{ width:42px; height:42px; right:16px; bottom:16px; }
}

/* ---------- 页脚档案层 ---------- */
.site-footer{
  position:relative;
  background:var(--color-night);
  color:var(--color-fog);
  border-top:1px solid rgba(198,255,0,.18);
  overflow:hidden;
}
.site-footer::before{
  content:"CLEAR PATH.";
  position:absolute;
  right:-20px;
  bottom:-30px;
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(90px, 12vw, 180px);
  line-height:1;
  letter-spacing:-.02em;
  color:var(--color-neon);
  opacity:.05;
  pointer-events:none;
  user-select:none;
}
.footer-accent{
  height:10px;
  background:linear-gradient(90deg, var(--color-neon), rgba(198,255,0,.15) 40%, transparent 80%);
  clip-path:polygon(0 0, 100% 0, calc(100% - 160px) 100%, 0% 100%);
}
.footer-grid{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:32px 40px;
  padding-block:56px 32px;
  position:relative;
  z-index:1;
}
.footer-col--brand{ grid-column:span 4; }
.footer-col{ grid-column:span 2; }
.footer-col--contact{ grid-column:span 4; }
.footer-brand{
  margin:0 0 8px;
  font-family:var(--font-head);
  font-weight:900;
  font-size:26px;
  letter-spacing:.02em;
  color:var(--color-white);
}
.footer-tagline{
  margin:0 0 18px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.1em;
  color:var(--color-neon);
}
.footer-about{
  margin:0;
  max-width:34ch;
  font-size:14px;
  line-height:1.7;
  color:var(--color-fog);
}
.footer-title{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--color-neon);
  padding-bottom:8px;
  border-bottom:1px solid rgba(186,200,220,.12);
}
.footer-link-list,
.footer-contact-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:8px;
  font-size:14px;
}
.footer-link-list a{
  color:var(--color-fog);
  text-decoration:none;
  transition:color .15s ease;
}
.footer-link-list a::before{
  content:"→ ";
  color:var(--color-neon);
  opacity:.6;
  margin-right:2px;
}
.footer-link-list a:hover{ color:var(--color-white); }
.footer-contact-list li{
  padding-left:18px;
  position:relative;
  color:var(--color-fog);
  line-height:1.6;
}
.footer-contact-list li::before{
  content:"◆";
  position:absolute;
  left:0;
  top:2px;
  font-size:8px;
  color:var(--color-ember);
}
.footer-bottom{
  position:relative;
  z-index:1;
  border-top:1px solid rgba(186,200,220,.12);
  padding-block:24px 32px;
  display:grid;
  gap:12px;
}
.footer-bottom-note{
  margin:0;
  font-size:12px;
  line-height:1.7;
  color:rgba(186,200,220,.8);
  max-width:70ch;
}
.footer-bottom-legal{
  display:flex;
  flex-wrap:wrap;
  gap:8px 24px;
  margin:0;
  font-size:13px;
  color:var(--color-fog);
}
.footer-bottom-legal p{ margin:0; }

/* ---------- 页脚响应式 ---------- */
@media (max-width:1024px){
  .footer-col--brand{ grid-column:span 6; }
  .footer-col{ grid-column:span 3; }
  .footer-col--contact{ grid-column:span 6; }
}
@media (max-width:640px){
  .footer-grid{ grid-template-columns:1fr; gap:28px; }
  .footer-col--brand,
  .footer-col,
  .footer-col--contact{ grid-column:span 1; }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce){
  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
  .status-dot{ animation:none; opacity:1; }
  .scroll-progress{ display:none; }
  [data-reveal]{ opacity:1; transform:none; transition:none; }
}