/* ===== 登录/注册页 ===== */
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%}
body{
  background:#07090d;color:#e9eff9;
  font:14px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  display:grid;place-items:center;padding:24px;overflow-x:hidden;
  background-image:
    radial-gradient(900px 520px at 12% 8%,rgba(255,178,60,.12),transparent 62%),
    radial-gradient(800px 500px at 88% 92%,rgba(90,180,255,.07),transparent 62%);
}
.bg-grid{position:fixed;inset:0;pointer-events:none;opacity:.5;
  background-image:linear-gradient(rgba(255,255,255,.022) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.022) 1px,transparent 1px);
  background-size:48px 48px;
  -webkit-mask-image:radial-gradient(circle at 50% 40%,#000 0%,transparent 78%);
  mask-image:radial-gradient(circle at 50% 40%,#000 0%,transparent 78%)}

.auth{position:relative;width:min(940px,100%);display:grid;grid-template-columns:1.15fr .85fr;
  border-radius:22px;overflow:hidden;
  background:linear-gradient(160deg,rgba(20,24,31,.96),rgba(10,12,16,.99));
  border:1px solid rgba(255,255,255,.08);
  box-shadow:0 50px 120px rgba(0,0,0,.7),inset 0 1px 0 rgba(255,255,255,.06)}

/* 左侧 */
.intro{padding:44px 40px;position:relative;overflow:hidden;
  background:
    radial-gradient(600px 300px at 20% 0%,rgba(255,178,60,.14),transparent 60%),
    linear-gradient(160deg,rgba(30,24,12,.85),rgba(12,11,9,.6));
  border-right:1px solid rgba(255,255,255,.06)}
.intro::after{content:"";position:absolute;right:-90px;bottom:-120px;width:320px;height:320px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,178,60,.16),transparent 68%)}
.i-logo{width:52px;height:52px;border-radius:15px;display:grid;place-items:center;font-size:23px;font-weight:800;color:#1a1206;
  background:linear-gradient(135deg,#ffe6a8,#ffb02e);box-shadow:0 12px 30px rgba(255,160,40,.34);margin-bottom:20px}
.intro h1{font-size:29px;letter-spacing:.02em;line-height:1.25;
  background:linear-gradient(100deg,#fff8e4,#ffc24b 52%,#e0a33c);
  -webkit-background-clip:text;background-clip:text;color:transparent}
.i-sub{font-size:12.5px;letter-spacing:.24em;color:#8d7a52;text-transform:uppercase;margin-top:6px}
.i-list{list-style:none;margin:28px 0 0;display:flex;flex-direction:column;gap:11px}
.i-list li{font-size:12.5px;color:#98a3b5;padding-left:20px;position:relative;line-height:1.6}
.i-list li::before{content:"";position:absolute;left:0;top:8px;width:6px;height:6px;border-radius:2px;
  background:linear-gradient(135deg,#ffe6a8,#ffb02e)}
.i-list b{color:#ffd98a;font-weight:700;margin-right:3px}
.i-foot{margin-top:32px;font-size:11.5px;color:#6e7789;font-style:italic;letter-spacing:.02em}

/* 右侧 */
.panel{padding:38px 34px;display:flex;flex-direction:column;justify-content:center}
.tabs{display:flex;gap:20px;margin-bottom:22px}
.tabs a{font-size:14px;color:#7f8a9c;padding-bottom:7px;position:relative;text-decoration:none;transition:.16s}
.tabs a:hover{color:#c9d3e2}
.tabs a.on{color:#ffe4a8;font-weight:600}
.tabs a.on::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;border-radius:2px;
  background:linear-gradient(90deg,#ffd97e,#ffb02e);box-shadow:0 0 10px rgba(255,176,46,.55)}

.panel label{display:block;font-size:11.5px;color:#8b96a8;margin-bottom:13px;letter-spacing:.02em}
.panel input{width:100%;height:42px;margin-top:6px;padding:0 13px;border-radius:11px;
  background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);
  color:#edf2fa;font-size:13.5px;outline:none;transition:.16s}
.panel input:focus{border-color:rgba(255,194,75,.55);background:rgba(255,194,75,.05);box-shadow:0 0 0 3px rgba(255,178,46,.09)}
.panel input::placeholder{color:#5b6576}
.submit{width:100%;height:44px;margin-top:8px;border:none;border-radius:12px;cursor:pointer;
  font-size:14px;font-weight:700;letter-spacing:.03em;color:#1a1206;
  background:linear-gradient(135deg,#ffe6a8,#ffb02e);transition:.18s;
  display:flex;align-items:center;justify-content:center;gap:8px;
  box-shadow:0 14px 32px rgba(255,160,40,.26)}
.submit:hover{filter:brightness(1.06);transform:translateY(-1px);box-shadow:0 18px 38px rgba(255,160,40,.34)}
.submit:active{transform:translateY(0)}
.switch{margin-top:16px;text-align:center;font-size:11.5px;color:#6f7a8c}
.switch a{color:#ffc24b;text-decoration:none}
.switch a:hover{text-decoration:underline}
.alert{padding:10px 13px;border-radius:10px;font-size:12px;margin-bottom:15px;line-height:1.55;
  background:rgba(255,90,90,.1);border:1px solid rgba(255,90,90,.28);color:#ffb4b4}
.notice{padding:10px 13px;border-radius:10px;font-size:11.5px;margin-bottom:15px;line-height:1.6;
  background:rgba(255,194,75,.08);border:1px solid rgba(255,194,75,.22);color:#e8d3a6}
.p-foot{margin-top:24px;text-align:center;font-size:10.5px;color:#4d5665;line-height:1.7}

@media(max-width:820px){
  body{padding:14px;align-items:start}
  .auth{grid-template-columns:1fr;margin:18px 0}
  .intro{padding:28px 24px 24px;border-right:none;border-bottom:1px solid rgba(255,255,255,.06)}
  .intro h1{font-size:23px}
  .i-list{margin-top:18px;gap:8px}
  .i-list li{font-size:12px}
  .i-foot{display:none}
  .panel{padding:24px 22px 30px}
}