/* ===========================================================
   NATIONAL TEAM · base.css
   设计令牌 / 重置 / 布局骨架 / 导航 / 卡片 / 页脚
   =========================================================== */

:root{
  --bg:#04070d;
  --bg-1:#070c16;
  --bg-2:#0b1220;
  --panel:rgba(14,22,38,.72);
  --panel-solid:#0d1524;
  --line:rgba(120,160,220,.16);
  --line-strong:rgba(120,170,240,.34);
  --ink:#e9f0fa;
  --ink-2:#b6c4da;
  --dim:#7d8ea8;
  --red:#e0122c;
  --red-2:#ff4d63;
  --gold:#f3c451;
  --cyan:#37dcff;
  --accent:#e0122c;
  --accent-2:#ff6b6b;
  --accent-soft:rgba(224,18,44,.14);
  --shadow:0 24px 70px rgba(0,0,0,.55);
  --r-lg:22px;
  --r-md:14px;
  --r-sm:9px;
  --max:1280px;
  --nav-h:72px;
  --ease:cubic-bezier(.22,.75,.2,1);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:"PingFang SC","HarmonyOS Sans SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:16px;line-height:1.75;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body.is-locked{overflow:hidden}
img,svg,canvas{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{list-style:none}
::selection{background:var(--accent);color:#fff}

/* ---------- 背景层 ---------- */
.bg-layer{position:fixed;inset:0;z-index:-3;pointer-events:none;background:
  radial-gradient(1200px 700px at 78% -10%, rgba(224,18,44,.16), transparent 62%),
  radial-gradient(900px 600px at 8% 8%, rgba(55,220,255,.10), transparent 60%),
  radial-gradient(1000px 800px at 50% 110%, rgba(243,196,81,.07), transparent 65%),
  linear-gradient(180deg,#04070d 0%,#060a13 45%,#04070d 100%);
}
.bg-grid{position:fixed;inset:0;z-index:-2;pointer-events:none;opacity:.5;
  background-image:linear-gradient(rgba(120,170,240,.055) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(120,170,240,.055) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(circle at 50% 30%,#000 0%,transparent 78%);
}
#stage{position:fixed;inset:0;z-index:-1;pointer-events:none}

/* ---------- 导航 ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:80;
  display:flex;align-items:center;gap:18px;padding:0 clamp(16px,4vw,40px);
  backdrop-filter:blur(18px) saturate(140%);
  background:linear-gradient(180deg,rgba(4,7,13,.86),rgba(4,7,13,.42));
  border-bottom:1px solid transparent;
  transition:border-color .4s var(--ease),background .4s var(--ease),height .35s var(--ease);
}
.nav.scrolled{border-bottom-color:var(--line);background:rgba(4,7,13,.94);height:62px}
.brand{display:flex;align-items:center;gap:11px;flex-shrink:0}
.brand-mark{
  width:36px;height:36px;border-radius:11px;display:grid;place-items:center;
  background:linear-gradient(145deg,var(--red),#7c0a1c);
  box-shadow:0 0 0 1px rgba(255,255,255,.16) inset,0 8px 22px rgba(224,18,44,.42);
  position:relative;overflow:hidden;
}
.brand-mark::after{content:"";position:absolute;inset:-40%;background:linear-gradient(115deg,transparent 40%,rgba(255,255,255,.6) 50%,transparent 60%);
  animation:sweep 3.4s linear infinite}
@keyframes sweep{0%{transform:translateX(-70%)}100%{transform:translateX(70%)}}
.brand-mark svg{width:20px;height:20px;z-index:1}
.brand-txt{display:flex;flex-direction:column;line-height:1.14}
.brand-txt b{font-size:15.5px;letter-spacing:.14em;font-weight:800}
.brand-txt span{font-size:9.5px;letter-spacing:.34em;color:var(--dim);font-weight:600}

.nav-links{display:flex;align-items:center;gap:2px;margin-left:auto;flex-wrap:nowrap;overflow:auto;scrollbar-width:none}
.nav-links::-webkit-scrollbar{display:none}
.nav-links a{
  position:relative;padding:8px 12px;border-radius:8px;font-size:13.5px;color:var(--ink-2);
  white-space:nowrap;transition:color .25s,background .25s;
}
.nav-links a::after{content:"";position:absolute;left:12px;right:12px;bottom:3px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--accent),var(--gold));transform:scaleX(0);transform-origin:left;transition:transform .35s var(--ease)}
.nav-links a:hover{color:#fff;background:rgba(255,255,255,.05)}
.nav-links a:hover::after,.nav-links a.on::after{transform:scaleX(1)}
.nav-links a.on{color:#fff}

.nav-burger{display:none;width:40px;height:40px;margin-left:auto;border-radius:10px;border:1px solid var(--line);place-items:center;gap:4px}
.nav-burger i{display:block;width:17px;height:1.7px;background:var(--ink);transition:.3s var(--ease)}

/* ---------- 通用容器 ---------- */
.wrap{width:100%;max-width:var(--max);margin:0 auto;padding:0 clamp(16px,4vw,40px)}
.sec{padding:clamp(56px,8vw,110px) 0;position:relative}
.sec-head{max-width:820px;margin-bottom:44px}
.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-size:11.5px;letter-spacing:.3em;font-weight:700;color:var(--accent-2);
  padding:6px 13px;border-radius:999px;border:1px solid var(--accent-soft);
  background:linear-gradient(90deg,rgba(224,18,44,.14),transparent);
  margin-bottom:18px;text-transform:uppercase;
}
.eyebrow i{width:5px;height:5px;border-radius:50%;background:var(--accent-2);box-shadow:0 0 12px var(--accent-2);animation:pulse 1.8s infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.35;transform:scale(.7)}}
h1,h2,h3,h4{line-height:1.22;font-weight:800;letter-spacing:-.01em}
.sec-head h2{font-size:clamp(26px,4.2vw,46px)}
.sec-head p{margin-top:14px;color:var(--ink-2);font-size:clamp(14px,1.5vw,16.5px);max-width:70ch}
.grad-txt{
  background:linear-gradient(105deg,#fff 0%,#ffd9de 34%,var(--gold) 62%,#fff 88%);
  background-size:220% 100%;
  -webkit-background-clip:text;background-clip:text;color:transparent;
  animation:gradShift 9s ease-in-out infinite;
}
@keyframes gradShift{0%,100%{background-position:0% 50%}50%{background-position:100% 50%}}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 26px;border-radius:999px;font-size:14px;font-weight:700;letter-spacing:.06em;
  border:1px solid var(--line-strong);background:rgba(255,255,255,.03);color:var(--ink);
  transition:transform .3s var(--ease),border-color .3s,background .3s,box-shadow .3s;
  position:relative;overflow:hidden;
}
.btn svg{width:15px;height:15px;transition:transform .3s var(--ease)}
.btn:hover{transform:translateY(-2px);border-color:var(--accent);background:rgba(224,18,44,.12);box-shadow:0 12px 34px rgba(224,18,44,.24)}
.btn:hover svg{transform:translateX(4px)}
.btn.primary{background:linear-gradient(120deg,var(--red),#8f0b1e);border-color:transparent;box-shadow:0 14px 36px rgba(224,18,44,.34)}
.btn.primary:hover{box-shadow:0 18px 44px rgba(224,18,44,.48)}
.btn.ghost{background:transparent}

/* ---------- 卡片基类 ---------- */
.card{
  position:relative;border-radius:var(--r-lg);border:1px solid var(--line);
  background:linear-gradient(160deg,rgba(18,27,45,.86),rgba(8,13,22,.9));
  overflow:hidden;
}
.card::before{
  content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;
  background:linear-gradient(140deg,rgba(255,255,255,.22),transparent 38%,transparent 62%,var(--accent-soft));
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none;opacity:.7;
}

/* ---------- 页脚 ---------- */
.footer{border-top:1px solid var(--line);padding:56px 0 40px;background:linear-gradient(180deg,transparent,rgba(224,18,44,.05))}
.footer-top{display:flex;flex-wrap:wrap;gap:36px;justify-content:space-between;padding-bottom:34px;border-bottom:1px solid var(--line)}
.footer-brand{max-width:380px}
.footer-brand p{margin-top:14px;color:var(--dim);font-size:13.5px;line-height:1.9}
.footer-cols{display:flex;gap:clamp(28px,5vw,72px);flex-wrap:wrap}
.footer-col h5{font-size:12px;letter-spacing:.24em;color:var(--gold);margin-bottom:14px;font-weight:700}
.footer-col a,.footer-col span{display:block;font-size:13.5px;color:var(--dim);padding:5px 0;transition:color .25s,transform .25s}
.footer-col a:hover{color:#fff;transform:translateX(3px)}
.footer-bot{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-top:26px;font-size:12.5px;color:var(--dim)}
.footer-bot b{color:var(--ink-2);font-weight:600}

/* ---------- 工具类 ---------- */
.row{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.mono{font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}
.hide{display:none!important}
.tag{display:inline-block;padding:3px 10px;border-radius:999px;font-size:11.5px;letter-spacing:.06em;
  border:1px solid var(--line-strong);color:var(--ink-2);background:rgba(255,255,255,.03)}

@media (max-width:1080px){
  .nav-links{display:none}
  .nav-burger{display:grid}
  .nav.open .nav-links{
    display:flex;flex-direction:column;align-items:stretch;gap:2px;
    position:fixed;top:var(--nav-h);left:0;right:0;padding:14px 18px 22px;
    background:rgba(5,9,16,.98);border-bottom:1px solid var(--line);
    max-height:calc(100vh - var(--nav-h));overflow:auto;
  }
  .nav.open .nav-links a{padding:13px 10px;font-size:15px;border-bottom:1px solid rgba(255,255,255,.05)}
  .nav.open .nav-links a::after{display:none}
}
@media (max-width:640px){
  body{font-size:15px}
  .brand-txt span{display:none}
  .sec{padding:52px 0}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  html{scroll-behavior:auto}
}