/* =========================================================
   3499开服 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 页头 / 页脚 / 基础组件
   ========================================================= */

:root{
  --ink-0:#05070F;
  --ink-1:#0B1226;
  --panel:#121C38;
  --white:#E8F4FF;
  --muted:#8A9BB8;
  --cyan:#19E3D1;
  --orange:#FF7A1A;
  --magenta:#FF2E93;
  --grid:#2A3A66;
  --cyan-deep:#0A3B3A;

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

  --container:1320px;
  --gutter:clamp(18px,4vw,56px);
  --cut:18px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --nav-bp:1024px;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink-0);
  color:var(--white);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:clip;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
::selection{background:var(--cyan);color:var(--ink-0)}
#main-content{scroll-margin-top:130px}

/* ---------- 中文排版 ---------- */
h1{font-size:clamp(38px,5.6vw,72px);font-weight:900;letter-spacing:.04em;line-height:1.05}
h2{font-size:clamp(26px,3.2vw,42px);font-weight:800;letter-spacing:.03em;line-height:1.15}
h3{font-size:clamp(19px,2vw,24px);font-weight:700;letter-spacing:.02em;line-height:1.35}
h4{font-size:17px;font-weight:700;letter-spacing:.04em}
p{max-width:68ch}
strong{font-weight:800;color:var(--white)}
.lede{font-size:clamp(17px,1.5vw,20px);line-height:1.72;color:var(--muted);max-width:60ch}

/* ---------- 容器 / 章节 / 网格 ---------- */
.container{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:var(--gutter)}
.container--narrow{max-width:880px}
.section{padding-block:clamp(56px,8vw,112px);position:relative}
.section-header{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:16px 32px;margin-bottom:clamp(24px,3vw,40px);
}
.grid{display:grid;gap:clamp(16px,2.4vw,32px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--asym{grid-template-columns:minmax(0,1.55fr) minmax(0,1fr)}
@media (max-width:900px){
  .grid--2,.grid--3,.grid--asym{grid-template-columns:minmax(0,1fr)}
}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;line-height:1;
  letter-spacing:.22em;text-transform:uppercase;color:var(--cyan);
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;flex:none}

.edge{
  height:1px;border:0;margin:0;
  background:linear-gradient(90deg,transparent,var(--grid) 15%,var(--cyan) 50%,var(--grid) 85%,transparent);
  opacity:.8;
}

/* ---------- 按钮 ---------- */
.btn{
  --btn-bg:transparent;
  --btn-fg:var(--white);
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 22px;
  background:var(--btn-bg);color:var(--btn-fg);
  font-size:14px;font-weight:700;letter-spacing:.08em;line-height:1.2;
  border:1px solid var(--grid);
  clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,12px 100%,0 calc(100% - 12px));
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:focus-visible{outline:none;box-shadow:0 0 0 2px var(--ink-0),0 0 0 4px var(--cyan)}
.btn--primary{--btn-bg:var(--cyan);--btn-fg:var(--ink-0);border-color:var(--cyan)}
.btn--primary:hover{--btn-bg:var(--white);border-color:var(--white)}
.btn--ghost{--btn-bg:transparent;--btn-fg:var(--white);border-color:var(--grid)}
.btn--ghost:hover{--btn-fg:var(--cyan);border-color:var(--cyan)}
.btn--warn{--btn-bg:var(--orange);--btn-fg:var(--ink-0);border-color:var(--orange)}
.btn--sm{padding:9px 16px;font-size:12px;letter-spacing:.1em}

/* ---------- 画板 / 标签 / 指标 / 链接 / 图片容器 ---------- */
.panel{
  position:relative;
  background:linear-gradient(160deg,var(--panel),var(--ink-1) 72%);
  border:1px solid var(--grid);
  padding:clamp(20px,3vw,36px);
}
.panel--cut{
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border:1px solid var(--grid);
  font-family:var(--font-mono);font-size:11px;line-height:1.5;
  letter-spacing:.16em;text-transform:uppercase;color:var(--muted);
}
.tag--live{background:var(--cyan);border-color:var(--cyan);color:var(--ink-0)}
.tag--hot{border-color:var(--orange);color:var(--orange)}
.stat{display:grid;gap:6px}
.stat__value{
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(26px,3.4vw,44px);line-height:1;letter-spacing:-.02em;color:var(--cyan);
}
.stat__label{
  font-family:var(--font-mono);font-size:11px;line-height:1.6;
  letter-spacing:.2em;text-transform:uppercase;color:var(--muted);
}
.link-arrow{
  display:inline-flex;align-items:center;gap:10px;
  color:var(--cyan);font-size:14px;font-weight:700;letter-spacing:.06em;
}
.link-arrow::after{content:"→";transition:transform .25s var(--ease)}
.link-arrow:hover::after{transform:translateX(6px)}

.media-frame{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16/10;
  background:var(--ink-1);border:1px solid var(--grid);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
}
.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:4/5}
.media-frame--placeholder::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(var(--grid) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:44px 44px;
  opacity:.28;
}

/* ---------- 面包屑 ---------- */
.breadcrumb{padding-block:20px;font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:var(--grid)}
.breadcrumb a{color:var(--muted);transition:color .2s var(--ease)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--white)}

/* =========================================================
   页头
   ========================================================= */
.skip-link{
  position:absolute;left:14px;top:-120px;z-index:200;
  padding:10px 18px;background:var(--cyan);color:var(--ink-0);
  font-size:14px;font-weight:700;letter-spacing:.04em;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:12px}

.site-header{
  position:sticky;top:0;z-index:80;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background .35s var(--ease),border-color .35s var(--ease),box-shadow .35s var(--ease);
}
.site-header.is-stuck{
  background:rgba(5,7,15,.94);
  border-bottom-color:var(--grid);
  box-shadow:0 24px 60px -40px #000;
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
}
.site-header.is-stuck .header-inner{padding-block:8px}
.site-header.is-stuck .header-rail{opacity:.7}

/* 顶部状态栏 */
.header-rail{
  display:flex;align-items:center;gap:clamp(14px,3vw,44px);
  max-width:var(--container);margin-inline:auto;
  padding:9px var(--gutter) 0;
  font-family:var(--font-mono);font-size:11px;line-height:1;
  letter-spacing:.16em;text-transform:uppercase;color:var(--muted);
  transition:opacity .3s var(--ease);
}
.header-rail__item{display:inline-flex;align-items:center;gap:8px;margin:0;max-width:none}
.header-rail__label{color:var(--muted)}
.header-rail__value{color:var(--white);letter-spacing:.1em}
.header-rail__dot{
  width:6px;height:6px;flex:none;border-radius:50%;
  background:var(--cyan);box-shadow:0 0 0 0 rgba(25,227,209,.55);
  animation:railPulse 2.6s ease-in-out infinite;
}
@keyframes railPulse{
  0%,100%{box-shadow:0 0 0 0 rgba(25,227,209,.55);opacity:1}
  50%{box-shadow:0 0 0 5px rgba(25,227,209,0);opacity:.65}
}

.header-inner{
  position:relative;
  display:flex;align-items:center;gap:clamp(14px,2.6vw,36px);
  max-width:var(--container);margin-inline:auto;
  padding:14px var(--gutter);
  transition:padding .3s var(--ease);
}

/* 品牌 */
.brand{display:inline-flex;align-items:center;gap:12px;flex:none}
.brand__mark{
  position:relative;flex:none;
  width:34px;height:34px;
  background:linear-gradient(140deg,var(--cyan),var(--magenta) 62%,var(--orange));
  clip-path:polygon(50% 0,100% 26%,100% 74%,50% 100%,0 74%,0 26%);
}
.brand__mark::after{
  content:"";position:absolute;inset:7px;
  background:var(--ink-0);
  clip-path:polygon(50% 0,100% 26%,100% 74%,50% 100%,0 74%,0 26%);
}
.brand__text{display:grid;gap:2px}
.brand__name{font-size:19px;font-weight:900;letter-spacing:.14em;line-height:1.1;color:var(--white)}
.brand__sub{
  font-family:var(--font-mono);font-size:9.5px;line-height:1;
  letter-spacing:.26em;text-transform:uppercase;color:var(--muted);
}

/* 导航 */
.primary-nav{display:flex;align-items:center}
.nav-list{display:flex;align-items:center;gap:clamp(4px,1.3vw,20px);counter-reset:navidx}
.nav-list > li{counter-increment:navidx}
.nav-link{
  position:relative;display:inline-flex;align-items:baseline;gap:6px;
  padding:8px 4px;font-size:14px;font-weight:600;letter-spacing:.06em;
  color:var(--muted);
  transition:color .2s var(--ease);
}
.nav-link::before{
  content:counter(navidx,decimal-leading-zero);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;
  color:var(--grid);transition:color .2s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left;
  transition:transform .28s var(--ease);
}
.nav-link:hover,.nav-link:focus-visible{color:var(--white)}
.nav-link:hover::before,.nav-link:focus-visible::before{color:var(--cyan)}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--white)}
.nav-link[aria-current="page"]::before{color:var(--cyan)}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--orange)}

.nav-cta{display:none}

.header-actions{margin-left:auto;display:flex;align-items:center;gap:10px}

/* 移动端开关 */
.nav-toggle{
  display:none;align-items:center;gap:10px;margin-left:auto;
  padding:10px 14px;border:1px solid var(--grid);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--white);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{position:relative;display:block;width:18px;height:12px;flex:none}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;right:0;height:2px;
  background:currentColor;transition:transform .25s var(--ease),top .25s var(--ease),bottom .25s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.site-header[data-open="true"] .nav-toggle{border-color:var(--cyan);color:var(--cyan)}
.site-header[data-open="true"] .nav-toggle__bars::before{top:5px;transform:rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars::after{bottom:5px;transform:rotate(-45deg)}

/* 滚动进度脉冲 */
.header-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;pointer-events:none}
.header-progress__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--cyan),var(--orange) 68%,var(--magenta));
  transition:width .08s linear;
}

/* =========================================================
   页脚
   ========================================================= */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(64px,9vw,120px);
  background:linear-gradient(180deg,var(--ink-1),var(--ink-0) 62%);
  border-top:1px solid var(--grid);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:0;
  background-image:
    linear-gradient(var(--grid) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:72px 72px;
  opacity:.13;
  -webkit-mask-image:linear-gradient(180deg,#000,transparent 72%);
  mask-image:linear-gradient(180deg,#000,transparent 72%);
}
.footer-watermark{
  position:absolute;right:-.04em;bottom:-.14em;z-index:0;
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(120px,26vw,340px);line-height:.8;letter-spacing:-.05em;
  color:transparent;-webkit-text-stroke:1px rgba(42,58,102,.55);
  pointer-events:none;user-select:none;
}

.footer-top{
  position:relative;z-index:1;
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.5fr);
  gap:clamp(28px,5vw,72px);
  padding-block:clamp(44px,6vw,80px);
}
.footer-brand{display:grid;gap:14px;align-content:start}
.brand--footer .brand__mark{width:42px;height:42px}
.brand--footer .brand__name{font-size:22px}
.footer-line{
  margin:0;font-family:var(--font-mono);font-size:12px;line-height:1.7;
  letter-spacing:.16em;text-transform:uppercase;color:var(--muted);max-width:none;
}
.footer-status{
  margin:0;display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;line-height:1.6;
  letter-spacing:.12em;color:var(--cyan);max-width:none;
}
.footer-status__dot{
  width:6px;height:6px;flex:none;border-radius:50%;
  background:var(--orange);box-shadow:0 0 12px rgba(255,122,26,.8);
}

.footer-columns{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(16px,2.4vw,32px);
}
.footer-col__title{
  font-family:var(--font-mono);font-size:11px;font-weight:500;line-height:1;
  letter-spacing:.24em;text-transform:uppercase;color:var(--cyan);
  margin-bottom:16px;
}
.footer-links li + li{margin-top:10px}
.footer-link{
  display:inline-flex;align-items:center;gap:8px;
  font-size:15px;color:var(--muted);
  transition:color .2s var(--ease);
}
.footer-link::before{
  content:"";display:block;width:0;height:1px;flex:none;
  background:var(--cyan);transition:width .25s var(--ease);
}
.footer-link:hover{color:var(--white)}
.footer-link:hover::before{width:14px}

.footer-contact{
  grid-column:1 / -1;
  display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));
  gap:18px 28px;
  padding-top:clamp(20px,3vw,28px);
  border-top:1px solid var(--grid);
}
.footer-contact__item{display:grid;gap:5px;min-width:0}
.footer-contact__label{
  font-family:var(--font-mono);font-size:10px;line-height:1.4;
  letter-spacing:.24em;text-transform:uppercase;color:var(--muted);
}
.footer-contact__value{
  font-family:var(--font-mono);font-size:15px;line-height:1.6;
  letter-spacing:.03em;color:var(--white);
  overflow-wrap:anywhere;
}

.footer-bottom{
  position:relative;z-index:1;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 24px;
  padding-block:20px 30px;
  border-top:1px solid rgba(42,58,102,.6);
  font-size:13px;color:var(--muted);
}
.footer-icp{
  margin:0;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.1em;color:var(--muted);max-width:none;
}
.footer-note{margin:0;font-size:13px;color:var(--muted);max-width:none}

/* 回顶按钮 */
.to-top{
  position:fixed;right:clamp(14px,3vw,32px);bottom:clamp(14px,3vw,32px);z-index:70;
  width:46px;height:46px;display:grid;place-items:center;
  background:rgba(11,18,38,.92);border:1px solid var(--grid);color:var(--cyan);
  clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,12px 100%,0 calc(100% - 12px));
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s,border-color .2s,color .2s;
}
.to-top.is-visible{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--cyan);color:var(--white)}
.to-top:focus-visible{outline:none;box-shadow:0 0 0 2px var(--ink-0),0 0 0 4px var(--cyan)}
.to-top__arrow{
  display:block;width:10px;height:10px;
  border-left:2px solid currentColor;border-top:2px solid currentColor;
  transform:rotate(45deg) translate(1px,1px);
}

/* =========================================================
   动效协议
   ========================================================= */
.js [data-reveal]{
  opacity:0;transform:translateY(18px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
.js [data-reveal].is-revealed{opacity:1;transform:none}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1180px){
  .header-actions .btn--ghost{display:none}
}

@media (max-width:var(--nav-bp)){
  .header-rail{display:none}
  .header-inner{gap:12px;padding-block:12px}
  .nav-toggle{display:inline-flex}
  .header-actions{display:none}

  .primary-nav{
    position:absolute;top:100%;left:0;right:0;display:none;
    background:var(--ink-1);
    border-top:1px solid var(--grid);border-bottom:1px solid var(--grid);
    box-shadow:0 40px 70px -40px #000;
    padding:16px var(--gutter) 26px;
    max-height:calc(100vh - 80px);overflow-y:auto;
  }
  .site-header[data-open="true"] .primary-nav{display:block}
  .site-header[data-open="true"]{background:rgba(5,7,15,.97);border-bottom-color:var(--grid)}

  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{
    width:100%;padding:14px 0;
    font-size:16px;letter-spacing:.04em;
    border-bottom:1px solid rgba(42,58,102,.55);
  }
  .nav-link::after{display:none}
  .nav-link::before{font-size:11px}
  .nav-link[aria-current="page"]{color:var(--cyan)}

  .nav-cta{display:grid;gap:10px;margin-top:20px}
  .nav-cta .btn{width:100%}

  .footer-top{grid-template-columns:minmax(0,1fr)}
  .footer-watermark{opacity:.7}
}

@media (max-width:760px){
  body{font-size:16px}
  .site-header.is-stuck .header-inner{padding-block:10px}
  .footer-columns{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 18px}
  .footer-bottom{padding-bottom:70px}
  .brand__sub{letter-spacing:.2em}
}

@media (max-width:480px){
  .brand__mark{width:28px;height:28px}
  .brand__mark::after{inset:6px}
  .brand__name{font-size:16px;letter-spacing:.1em}
  .brand__sub{display:none}
  .nav-toggle{padding:9px 12px}
  .nav-toggle__text{display:none}
  .footer-columns{grid-template-columns:minmax(0,1fr)}
}

/* =========================================================
   可访问性：减少动效
   ========================================================= */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js [data-reveal]{opacity:1;transform:none}
  .btn:hover{transform:none}
  .to-top{transform:none}
}