/* ==========================================================================
   云博赛场 — 共享样式 /assets/site.css
   Reset · 变量 · 中文排版 · 页头 · 页脚 · 通用组件 · 响应式
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Reset
   -------------------------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;background:#050B1E;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd,hr,fieldset,legend{margin:0}
ul,ol{list-style:none;padding:0}
img,svg,video,canvas{display:block;max-width:100%}
img{height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid #FF7A29;outline-offset:3px}

/* --------------------------------------------------------------------------
   2. 设计变量
   -------------------------------------------------------------------------- */
:root{
  /* 色彩 */
  --ink:#050B1E;
  --stand:#0B1834;
  --tactic:#12305F;
  --lime:#7CFF3D;
  --cyan:#35D6FF;
  --amber:#FF7A29;
  --ice:#F2F6FF;
  --mist:#93A4C4;
  --grad-stand:linear-gradient(135deg,#0B1834 0%,#12305F 58%,#1C4A34 100%);
  --grad-line:linear-gradient(90deg,#35D6FF 0%,#7CFF3D 100%);

  /* 形状与材质 */
  --edge:2px solid;
  --shadow-hard:8px 8px 0 0 rgba(18,48,95,.9);
  --shadow-soft:6px 6px 0 0 rgba(18,48,95,.85);
  --shadow-lime:8px 8px 0 0 rgba(124,255,61,.22);

  /* 字体 */
  --sans:"HarmonyOS Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:"JetBrains Mono","SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;

  /* 度量 */
  --shell:1440px;
  --gutter:clamp(16px,4vw,56px);
  --gap:clamp(16px,2.4vw,32px);
  --section-y:clamp(48px,7vw,104px);
  --header-h:clamp(64px,7vw,80px);
}

/* --------------------------------------------------------------------------
   3. 基础排版
   -------------------------------------------------------------------------- */
body{
  font-family:var(--sans);
  font-size:clamp(16px,1.05vw,17px);
  line-height:1.8;
  font-weight:400;
  color:var(--ice);
  background:var(--ink);
  min-height:100vh;
  overflow-x:hidden;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
}

/* 网格底纹：可感知但不抢内容 */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(18,48,95,.55) 1px,transparent 1px),
    linear-gradient(90deg,rgba(18,48,95,.55) 1px,transparent 1px);
  background-size:72px 72px;
  opacity:.32;
  -webkit-mask-image:radial-gradient(130% 95% at 50% 0%,#000 18%,transparent 88%);
  mask-image:radial-gradient(130% 95% at 50% 0%,#000 18%,transparent 88%);
}

h1,h2,h3,h4{line-height:1.14;letter-spacing:-.02em;font-weight:900;color:var(--ice)}
h1{font-size:clamp(38px,6.6vw,132px);letter-spacing:-.03em;line-height:1.02}
h2{font-size:clamp(26px,3vw,52px)}
h3{font-size:clamp(20px,1.8vw,28px)}
p{max-width:72ch}
strong{font-weight:800}
small{font-size:.82em}
::selection{background:var(--lime);color:var(--ink)}

/* --------------------------------------------------------------------------
   4. 布局容器与网格
   -------------------------------------------------------------------------- */
main{position:relative;z-index:1}
.wrap{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter);position:relative;z-index:1}
.section{position:relative;padding-block:var(--section-y)}
.section--tight{padding-block:clamp(32px,4.5vw,64px)}
.section--flush{padding-block:0}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap)}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-12{grid-column:span 12}

/* 渐变过渡带 */
.grad-band{
  background:var(--grad-stand);
  background-size:200% 200%;
  border-block:var(--edge) var(--tactic);
  animation:grad-drift 20s ease-in-out infinite alternate;
}
@keyframes grad-drift{
  from{background-position:0% 50%}
  to{background-position:100% 50%}
}

/* --------------------------------------------------------------------------
   5. 通用小组件
   -------------------------------------------------------------------------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.28em;
  text-transform:uppercase;
  color:var(--mist);
  line-height:1.4;
}
.eyebrow::before{content:"";width:10px;height:10px;flex:none;background:var(--lime)}

.sec-num{
  display:block;
  font-family:var(--mono);
  font-weight:700;
  font-size:clamp(44px,6.4vw,96px);
  line-height:.86;
  letter-spacing:-.04em;
  color:rgba(124,255,61,.18);
  user-select:none;
}

.placard{
  display:inline-flex;
  align-items:baseline;
  gap:8px;
  padding:6px 11px;
  border:var(--edge) var(--tactic);
  background:rgba(18,48,95,.5);
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--ice);
  line-height:1.6;
}
.placard b{color:var(--lime);font-weight:700}

/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:14px 24px;
  font-size:15px;
  font-weight:800;
  letter-spacing:.02em;
  line-height:1.4;
  border:var(--edge) var(--lime);
  color:var(--lime);
  background:transparent;
  box-shadow:var(--shadow-soft);
  transition:transform .2s ease,box-shadow .2s ease,background .2s ease,color .2s ease,border-color .2s ease;
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:9px 9px 0 0 rgba(18,48,95,.95)}
.btn:active{transform:translate(2px,2px);box-shadow:2px 2px 0 0 rgba(18,48,95,.9)}
.btn--primary{background:var(--lime);color:var(--ink);border-color:var(--lime)}
.btn--primary:hover{background:#95ff68;border-color:#95ff68}
.btn--ghost{border-color:var(--tactic);color:var(--ice)}
.btn--ghost:hover{border-color:var(--amber);color:var(--amber);background:rgba(255,122,41,.08)}

/* 面包屑 */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--mist);
}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"/";color:var(--tactic)}
.breadcrumb a{transition:color .2s ease}
.breadcrumb a:hover{color:var(--lime)}
.breadcrumb [aria-current="page"]{color:var(--ice)}

/* 图片容器 */
.media-frame{
  position:relative;
  overflow:hidden;
  border:var(--edge) var(--tactic);
  background:var(--stand);
  box-shadow:var(--shadow-hard);
}
.media-frame img{width:100%;height:100%;object-fit:cover;display:block}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--3x4{aspect-ratio:3/4}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame--slant{clip-path:polygon(0 0,100% 7%,100% 100%,0 93%)}
.media-frame__cap{
  position:absolute;
  left:0;
  bottom:0;
  max-width:88%;
  padding:8px 13px;
  background:rgba(5,11,30,.9);
  border-top:var(--edge) var(--lime);
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--ice);
  line-height:1.6;
}

/* 显现动效 */
[data-reveal]{
  opacity:0;
  transform:translateY(22px);
  transition:opacity .42s ease,transform .46s cubic-bezier(.2,.7,.3,1);
}
[data-reveal][data-revealed]{opacity:1;transform:none}

/* --------------------------------------------------------------------------
   6. 页头
   -------------------------------------------------------------------------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(5,11,30,.94);
  border-bottom:2px solid var(--tactic);
  transition:background .3s ease,border-color .3s ease;
}
.site-header[data-condensed]{
  background:rgba(5,11,30,.99);
  border-bottom-color:var(--lime);
}

.skip-link{
  position:absolute;
  left:16px;
  top:-120px;
  z-index:120;
  padding:12px 18px;
  background:var(--lime);
  color:var(--ink);
  font-weight:900;
  font-size:14px;
  border:2px solid var(--ink);
  transition:top .22s ease;
}
.skip-link:focus{top:14px}

.header-shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding:clamp(12px,1.5vw,20px) var(--gutter);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:clamp(16px,3vw,48px);
}

/* 品牌 */
.brand{display:flex;align-items:center;gap:12px;min-width:0;flex:none}
.brand-mark{
  width:42px;
  height:42px;
  flex:none;
  display:grid;
  place-items:center;
  font-family:var(--mono);
  font-size:19px;
  font-weight:700;
  color:var(--ink);
  background:var(--lime);
  box-shadow:4px 4px 0 0 var(--tactic);
  transition:width .28s ease,height .28s ease,font-size .28s ease,box-shadow .28s ease;
}
.brand-text{display:flex;flex-direction:column;line-height:1.25;min-width:0}
.brand-name{font-size:19px;font-weight:900;letter-spacing:.02em;color:var(--ice);white-space:nowrap}
.brand-tag{
  font-family:var(--mono);
  font-size:10.5px;
  letter-spacing:.2em;
  color:var(--mist);
  white-space:nowrap;
  transition:opacity .25s ease;
}
.site-header[data-condensed] .brand-mark{width:33px;height:33px;font-size:15px;box-shadow:3px 3px 0 0 var(--tactic)}
.site-header[data-condensed] .brand-tag{opacity:0}

/* 主导航 */
.site-nav{display:flex;align-items:center;min-width:0}
.nav-list{display:flex;align-items:center;gap:clamp(2px,0.7vw,8px);flex-wrap:nowrap}
.nav-link{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:7px;
  padding:10px clamp(8px,1vw,14px);
  font-size:clamp(12.5px,0.95vw,15px);
  font-weight:700;
  color:var(--mist);
  border:2px solid transparent;
  white-space:nowrap;
  transition:color .22s ease,border-color .22s ease,background .22s ease;
}
.nav-idx{
  font-family:var(--mono);
  font-size:10px;
  font-weight:700;
  font-style:normal;
  letter-spacing:.08em;
  color:var(--tactic);
  transition:color .22s ease;
}
.nav-link:hover{color:var(--ice);border-color:var(--tactic);background:rgba(18,48,95,.45)}
.nav-link:hover .nav-idx{color:var(--lime)}
.nav-link[aria-current="page"]{color:var(--ice);border-color:var(--lime);background:rgba(124,255,61,.09)}
.nav-link[aria-current="page"] .nav-idx{color:var(--lime)}
.nav-link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:-4px;
  height:2px;
  background:var(--lime);
}

/* 移动端按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  border:var(--edge) var(--lime);
  color:var(--lime);
  background:rgba(124,255,61,.07);
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.24em;
  line-height:1;
  flex:none;
}
.nav-toggle-bars{display:grid;gap:4px;width:18px}
.nav-toggle-bars span{display:block;height:2px;background:currentColor;transition:transform .25s ease,opacity .25s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* 滚动进度 */
.header-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:3px;
  background:var(--tactic);
  overflow:hidden;
}
.header-progress-bar{
  display:block;
  height:100%;
  width:0;
  background:var(--grad-line);
  transition:width .12s linear;
}

/* 返回顶部 */
.back-top{
  position:fixed;
  right:clamp(14px,2.2vw,26px);
  bottom:clamp(18px,3vw,32px);
  z-index:70;
  width:46px;
  height:46px;
  display:grid;
  place-items:center;
  border:var(--edge) var(--lime);
  background:rgba(5,11,30,.92);
  color:var(--lime);
  font-family:var(--mono);
  font-size:16px;
  line-height:1;
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity .25s ease,transform .25s ease,visibility .25s ease,background .25s ease;
}
.back-top[data-visible]{opacity:1;visibility:visible;transform:none}
.back-top:hover{background:var(--lime);color:var(--ink)}

/* 右侧章节索引 */
.step-rail{
  position:fixed;
  right:clamp(10px,1.5vw,22px);
  top:50%;
  transform:translateY(-50%);
  z-index:55;
  display:grid;
  gap:14px;
}
.step-rail__link{
  display:grid;
  grid-template-columns:auto auto;
  align-items:center;
  gap:10px;
  font-family:var(--mono);
  font-size:10.5px;
  letter-spacing:.2em;
  color:var(--mist);
  justify-content:end;
}
.step-rail__link i{display:block;width:22px;height:2px;background:var(--tactic);transition:background .25s ease,width .25s ease}
.step-rail__link span{
  opacity:0;
  transform:translateX(6px);
  transition:opacity .25s ease,transform .25s ease;
  white-space:nowrap;
}
.step-rail__link:hover span,
.step-rail__link[data-active="true"] span{opacity:1;transform:none}
.step-rail__link:hover i,
.step-rail__link[data-active="true"] i{background:var(--lime);width:32px}
.step-rail__link[data-active="true"]{color:var(--lime)}

/* --------------------------------------------------------------------------
   7. 页脚
   -------------------------------------------------------------------------- */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:clamp(48px,8vw,120px);
  border-top:2px solid var(--tactic);
  background:linear-gradient(180deg,#0B1834 0%,#050B1E 72%);
}

.footer-cta{
  background:var(--grad-stand);
  background-size:200% 200%;
  border-bottom:2px solid var(--tactic);
  animation:grad-drift 20s ease-in-out infinite alternate;
}
.footer-cta__inner{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) auto;
  align-items:center;
  gap:clamp(20px,3vw,48px);
  padding-block:clamp(34px,4.6vw,62px);
}
.footer-cta__title{
  margin-top:14px;
  font-size:clamp(24px,3.2vw,44px);
  line-height:1.16;
  letter-spacing:-.02em;
}
.footer-cta__actions{display:flex;flex-wrap:wrap;gap:14px}

.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1.5fr;
  gap:clamp(20px,3vw,44px);
  padding-block:clamp(40px,5.6vw,72px);
}

.footer-brand{min-width:0}
.footer-brand__name{
  font-size:22px;
  font-weight:900;
  letter-spacing:.02em;
  color:var(--ice);
}
.footer-brand__line{
  margin-top:6px;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--lime);
}
.footer-brand__desc{
  margin-top:14px;
  margin-bottom:18px;
  font-size:14.5px;
  line-height:1.8;
  color:var(--mist);
  max-width:34ch;
}

.footer-col{min-width:0}
.footer-col__title{
  margin-bottom:18px;
  font-family:var(--mono);
  font-size:11.5px;
  font-weight:700;
  letter-spacing:.28em;
  text-transform:uppercase;
  color:var(--lime);
  line-height:1.4;
}
.footer-list{display:grid;gap:11px}
.footer-list a{
  font-size:15px;
  color:var(--mist);
  border-bottom:1px solid transparent;
  padding-bottom:2px;
  transition:color .2s ease,border-color .2s ease;
}
.footer-list a:hover{color:var(--ice);border-bottom-color:var(--lime)}

.footer-contact{display:grid;gap:12px}
.footer-contact__row{display:flex;gap:12px;align-items:baseline;font-size:14.5px;color:var(--ice);line-height:1.7}
.footer-contact__label{
  flex:none;
  width:44px;
  font-family:var(--mono);
  font-size:10.5px;
  letter-spacing:.2em;
  color:var(--cyan);
}
.footer-note{
  margin-top:18px;
  padding-left:14px;
  border-left:2px solid var(--tactic);
  font-size:13px;
  line-height:1.75;
  color:var(--mist);
  max-width:40ch;
}

.footer-base{border-top:1px solid rgba(18,48,95,.9)}
.footer-base__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 28px;
  padding-block:22px;
  font-family:var(--mono);
  font-size:12.5px;
  letter-spacing:.05em;
  color:var(--mist);
}
.footer-base__copy{font-size:12.5px}
.footer-base__links{display:flex;flex-wrap:wrap;align-items:center;gap:20px}
.footer-base__links a{transition:color .2s ease}
.footer-base__links a:hover{color:var(--lime)}
.footer-base__icp{color:var(--mist)}

/* --------------------------------------------------------------------------
   8. 响应式
   -------------------------------------------------------------------------- */
@media (max-width:1180px){
  .brand-tag{display:none}
  .footer-grid{grid-template-columns:1.5fr 1fr 1fr;}
  .footer-col--contact{grid-column:span 3}
}

@media (max-width:1024px){
  .grid-12{gap:clamp(14px,2vw,24px)}
  .span-3,.span-4,.span-5{grid-column:span 6}
  .span-6,.span-7,.span-8{grid-column:span 12}
  .step-rail{display:none}
}

@media (max-width:900px){
  .nav-toggle{display:inline-flex}

  .site-nav{
    position:fixed;
    left:0;
    right:0;
    bottom:0;
    top:auto;
    display:block;
    z-index:59;
    background:linear-gradient(180deg,#0B1834 0%,#050B1E 100%);
    border-top:2px solid var(--lime);
    max-height:0;
    overflow:hidden;
    visibility:hidden;
    transition:max-height .36s cubic-bezier(.2,.7,.3,1),visibility .36s ease;
    padding-bottom:env(safe-area-inset-bottom,0);
  }
  .site-nav[data-open]{
    max-height:min(76vh,540px);
    overflow-y:auto;
    visibility:visible;
  }
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:6px var(--gutter) 26px;
  }
  .nav-link{
    padding:16px 2px;
    font-size:17px;
    border:0;
    border-bottom:1px solid rgba(18,48,95,.95);
    background:none;
  }
  .nav-link:hover{background:none;border-color:transparent;border-bottom-color:var(--amber);color:var(--ice)}
  .nav-link[aria-current="page"]{
    background:none;
    border-color:transparent;
    border-bottom-color:var(--lime);
    color:var(--lime);
  }
  .nav-link[aria-current="page"]::after{display:none}
  .nav-idx{font-size:11px}

  .back-top{display:none}
  .footer-cta__inner{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-col--contact{grid-column:span 2}
  .footer-brand{grid-column:span 2}
}

@media (max-width:640px){
  :root{--shadow-hard:5px 5px 0 0 rgba(18,48,95,.9);--shadow-soft:4px 4px 0 0 rgba(18,48,95,.85)}
  body{font-size:16px}
  .brand-mark{width:36px;height:36px;font-size:16px}
  .brand-name{font-size:17px}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:span 6}
  .footer-grid{grid-template-columns:1fr}
  .footer-col--contact,.footer-brand{grid-column:span 1}
  .footer-base__inner{flex-direction:column;align-items:flex-start}
  .btn{width:100%}
  .footer-cta__actions{width:100%}
  .footer-contact__row{flex-direction:column;gap:2px}
  .footer-contact__label{width:auto}
}

/* --------------------------------------------------------------------------
   9. 动效可访问性
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1;transform:none}
  .grad-band,.footer-cta{animation:none}
}