:root{--bg:#090a0d;--surface:#12141a;--surface-2:#181b22;--ink:#f5f5f3;--muted:#a0a4ae;--line:#2a2e37;--accent:#ff5a36;--accent-2:#ff896c;--danger:#ff8071;font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;color-scheme:dark}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(circle at 14% 16%,rgba(255,90,54,.14),transparent 27rem),var(--bg);color:var(--ink)}button,input{font:inherit}.shell{min-height:100vh;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(360px,.85fr)}.intro{position:relative;padding:clamp(32px,5vw,76px);display:flex;flex-direction:column;justify-content:space-between;border-right:1px solid var(--line);overflow:hidden}.intro:after{content:"";position:absolute;width:420px;height:420px;border:1px solid rgba(255,255,255,.07);border-radius:50%;right:-180px;bottom:-180px;box-shadow:0 0 0 72px rgba(255,255,255,.018),0 0 0 144px rgba(255,255,255,.012);pointer-events:none}.brand{display:flex;align-items:center;gap:14px;font:600 12px/1 ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.2em;color:#c8cbd1}.mark{display:grid;place-items:center;width:46px;height:46px;border-radius:14px;background:var(--accent);color:white;font:800 14px/1 ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:-.04em;box-shadow:0 12px 38px rgba(255,90,54,.24)}.copy{max-width:720px;padding:72px 0}.eyebrow{margin:0 0 16px;color:var(--accent-2);font:600 12px/1.4 ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.16em;text-transform:uppercase}.copy h1{margin:0;font-size:clamp(58px,8vw,112px);line-height:.92;letter-spacing:-.07em;font-weight:740}.summary{max-width:580px;margin:34px 0 0;color:#b9bdc5;font-size:clamp(17px,1.5vw,21px);line-height:1.8}.capabilities{display:flex;flex-wrap:wrap;gap:10px;margin:0;padding:0;list-style:none}.capabilities li{padding:9px 13px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.025);color:#bfc2c9;font-size:13px}.login-card{align-self:center;width:min(470px,calc(100% - 64px));margin:auto;padding:clamp(30px,4vw,52px);background:linear-gradient(155deg,rgba(255,255,255,.035),transparent 55%),var(--surface);border:1px solid var(--line);border-radius:24px;box-shadow:0 28px 80px rgba(0,0,0,.32)}.login-card header h2{margin:0;font-size:34px;letter-spacing:-.04em}.login-card header>p:last-child{margin:12px 0 32px;color:var(--muted)}form{display:grid;gap:11px}label{margin-top:8px;color:#ced0d5;font-size:13px;font-weight:650}input{width:100%;height:52px;padding:0 15px;border:1px solid var(--line);border-radius:12px;background:var(--surface-2);color:var(--ink);outline:none;transition:border-color .18s,box-shadow .18s}input:focus{border-color:var(--accent);box-shadow:0 0 0 4px rgba(255,90,54,.13)}button{height:52px;margin-top:16px;border:0;border-radius:12px;background:var(--accent);color:white;font-weight:750;cursor:pointer;transition:transform .18s,background .18s}button:hover{background:#ff6b49;transform:translateY(-1px)}button:focus-visible{outline:3px solid rgba(255,137,108,.5);outline-offset:3px}button:disabled{opacity:.65;cursor:wait;transform:none}.error{margin:5px 0 0;padding:11px 12px;border-radius:10px;background:rgba(255,74,58,.1);color:var(--danger);font-size:13px;line-height:1.5}.footnote{margin:26px 0 0;text-align:center;color:#737883;font-size:12px}@media(max-width:850px){.shell{grid-template-columns:1fr}.intro{min-height:42vh;padding:28px;border-right:0;border-bottom:1px solid var(--line)}.copy{padding:58px 0 36px}.copy h1{font-size:clamp(48px,15vw,76px)}.summary{margin-top:24px}.capabilities{display:none}.login-card{width:calc(100% - 32px);margin:28px auto 38px;padding:28px 22px;border-radius:20px}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}