/* 登录页：three.js DNA 粒子 + D3 前沿主题力导向网络 */
:root{--nv:#050A18;--cy:#22D3EE;--bl:#3B82F6}
html,body{height:100%}
body{margin:0;background:var(--nv);color:#E8EEF9;font-family:var(--sans);overflow:hidden}
#bg{position:fixed;inset:0;width:100%;height:100%;object-fit:cover;opacity:.55;z-index:0}
#gl{position:fixed;inset:0;z-index:1}
.veil{position:fixed;inset:0;z-index:2;pointer-events:none;
  background:radial-gradient(120% 90% at 18% 50%,rgba(5,10,24,.94) 18%,rgba(5,10,24,.72) 48%,rgba(5,10,24,.35) 100%)}
.page{position:relative;z-index:3;height:100%;display:grid;grid-template-columns:minmax(0,1fr) 460px;
  align-items:center;gap:30px;padding:0 clamp(20px,5vw,84px);overflow-y:auto}
.intro{max-width:620px}
.intro .logo{height:52px;margin-bottom:26px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:'Orbitron',monospace;font-size:11px;
  letter-spacing:.22em;color:#5EEAD4;text-transform:uppercase;border:1px solid rgba(94,234,212,.32);
  border-radius:30px;padding:5px 13px;background:rgba(94,234,212,.07)}
.intro h1{font-size:clamp(30px,4.4vw,52px);line-height:1.12;margin:18px 0 10px;color:#fff;letter-spacing:-.02em;
  text-shadow:0 2px 30px rgba(34,211,238,.25)}
.intro h1 em{font-style:normal;background:linear-gradient(100deg,#67E8F9,#3B82F6);-webkit-background-clip:text;
  background-clip:text;color:transparent}
.intro .en{font-family:'Orbitron',monospace;font-size:13px;letter-spacing:.2em;color:#7C93BE;text-transform:uppercase}
.intro .desc{color:#9FB2D4;font-size:15px;margin:16px 0 0;max-width:520px;line-height:1.8}
.net{margin-top:18px;height:230px;width:100%;max-width:560px}
.net text{font-family:var(--sans);font-size:11.5px;fill:#AFC4E6;pointer-events:none;user-select:none}
.net circle{cursor:grab}
.marks{display:flex;gap:18px;margin-top:14px;flex-wrap:wrap;color:#7C93BE;font-size:12.5px}
.marks b{color:#5EEAD4;font-family:'Orbitron',monospace;font-size:15px;display:block}

.panel{background:rgba(10,18,40,.72);backdrop-filter:blur(18px);border:1px solid rgba(120,160,230,.2);
  border-radius:22px;padding:30px 30px 24px;box-shadow:0 30px 70px -30px rgba(0,0,0,.9);width:100%;max-width:460px;
  justify-self:end;position:relative;overflow:hidden}
.panel::before{content:"";position:absolute;inset:0 0 auto;height:1px;
  background:linear-gradient(90deg,transparent,rgba(34,211,238,.8),transparent)}
.panel .emblem{width:60px;height:60px;display:block;margin:0 auto 12px;filter:drop-shadow(0 4px 14px rgba(34,211,238,.35))}
.panel h2{text-align:center;font-size:20px;color:#fff;margin:0 0 4px}
.panel .sub{text-align:center;color:#8BA0C6;font-size:12.5px;margin-bottom:20px}
.fld{margin-bottom:15px}
.fld label{display:block;font-size:12.5px;color:#9FB2D4;margin-bottom:7px;font-weight:600}
.fld .box{position:relative;display:flex;align-items:center}
.fld .box>svg{position:absolute;left:13px;width:18px;height:18px;stroke:#5C7099;fill:none;stroke-width:1.9;
  stroke-linecap:round;stroke-linejoin:round;pointer-events:none}
.fld input{width:100%;padding:13px 14px 13px 42px;border-radius:12px;border:1px solid rgba(120,160,230,.24);
  background:rgba(8,14,32,.8);color:#EAF1FF;font-size:16px;transition:.18s}
.fld input::placeholder{color:#55688F}
.fld input:focus{outline:none;border-color:var(--cy);box-shadow:0 0 0 3px rgba(34,211,238,.16);background:rgba(8,14,32,.95)}
.fld .eye{position:absolute;right:8px;background:none;border:0;color:#5C7099;cursor:pointer;padding:8px;
  display:grid;place-items:center;border-radius:8px}
.fld .eye:hover{color:var(--cy);background:rgba(34,211,238,.1)}
.fld .eye svg{width:19px;height:19px;stroke:currentColor;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.row{display:flex;align-items:center;justify-content:space-between;margin:4px 0 18px;font-size:13px;color:#9FB2D4}
.row label{display:inline-flex;align-items:center;gap:7px;cursor:pointer;user-select:none}
.row input{width:16px;height:16px;accent-color:var(--cy)}
.go{width:100%;padding:14px;border:0;border-radius:12px;background:linear-gradient(120deg,#22D3EE,#2563EB);
  color:#04121F;font-size:16px;font-weight:800;letter-spacing:.06em;cursor:pointer;transition:.18s;
  box-shadow:0 12px 30px -12px rgba(34,211,238,.75);min-height:50px}
.go:hover{filter:brightness(1.07)}
.go:active{transform:translateY(1px)}
.go[disabled]{opacity:.65;cursor:default}
.alert{background:rgba(220,38,38,.14);border:1px solid rgba(248,113,113,.4);color:#FCA5A5;border-radius:11px;
  padding:10px 13px;font-size:13.5px;margin-bottom:15px;display:flex;gap:8px;align-items:center}
.capslock{color:#FCD34D;font-size:12.5px;margin-top:7px;display:flex;gap:6px;align-items:center}
.tips{margin-top:18px;padding-top:15px;border-top:1px solid rgba(120,160,230,.16);color:#7C93BE;font-size:12.5px;line-height:1.85}
.tips b{color:#AFC4E6;font-weight:600}
.foot{position:fixed;bottom:12px;left:0;right:0;text-align:center;color:#4C5E82;font-size:12px;z-index:3;
  padding-bottom:env(safe-area-inset-bottom,0px)}

@media (max-width:1100px){
  .page{grid-template-columns:minmax(0,1fr);justify-items:center;padding:28px 20px 70px;height:auto;min-height:100%;
    align-content:center;gap:22px}
  body{overflow:auto}
  .intro{text-align:center;max-width:560px}
  .net{height:190px;margin:12px auto 0}
  .marks{justify-content:center}
  .panel{justify-self:center}
  .veil{background:linear-gradient(180deg,rgba(5,10,24,.86),rgba(5,10,24,.94))}
}
@media (max-width:767px){
  .intro .logo{height:38px;margin-bottom:14px}
  .intro h1{font-size:28px}
  .intro .desc,.net,.marks{display:none}
  .panel{padding:24px 20px 20px;border-radius:18px}
  .page{padding:22px 16px 64px}
}
@media (prefers-reduced-motion:reduce){#gl{display:none}#bg{opacity:.8}}