:root{
  --bg:#eef2f6;--surface:#ffffff;--surface-2:#f8fafc;--line:#e2e8f0;
  --text:#0f172a;--muted:#64748b;--faint:#94a3b8;
  --brand:#0f766e;--brand-soft:#5eead4;--brand-ink:#0b5b54;--brand-bg:#f0fdfa;
  --ok:#059669;--ok-soft:#ecfdf5;--warn:#d97706;--warn-soft:#fffbeb;
  --danger:#dc2626;--danger-soft:#fef2f2;--info:#0891b2;--grid:#eef2f6;
  --shadow:0 1px 2px rgba(15,23,42,.05),0 8px 24px -18px rgba(15,23,42,.25);
  --radius:14px;--radius-sm:10px;--sans:Inter,ui-sans-serif,system-ui,"Segoe UI",Roboto,sans-serif;
}
[data-theme="dark"]{
  color-scheme:dark;--bg:#0b1220;--surface:#0f1a2e;--surface-2:#132340;--line:#1e2f4d;
  --text:#e8eef7;--muted:#93a4bd;--faint:#5b6b86;
  --brand:#2dd4bf;--brand-soft:#0d9488;--brand-ink:#5eead4;--brand-bg:#0c2b25;
  --ok:#34d399;--ok-soft:#0c2b25;--warn:#fbbf24;--warn-soft:#2a2110;
  --danger:#f87171;--danger-soft:#2a1414;--info:#38bdf8;--grid:#16233d;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 18px 40px -24px rgba(0,0,0,.7);
}
*{box-sizing:border-box}body{margin:0;font-family:var(--sans);background:var(--bg);display:flex;min-height:100vh;align-items:center;justify-content:center;color:var(--text);transition:background .25s,color .25s}
.card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:32px;width:340px;box-shadow:var(--shadow)}
h1{font-size:18px;margin:0 0 4px}.sub{color:var(--muted);font-size:13px;margin-bottom:20px}
label{display:block;font-size:12px;color:var(--muted);margin:12px 0 4px}
input{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:10px;font-size:14px;outline:none;background:var(--surface-2);color:var(--text)}
input:focus{border-color:var(--brand);box-shadow:0 0 0 1px var(--brand)}
button{width:100%;margin-top:20px;padding:11px;background:var(--brand);color:#fff;border:0;border-radius:10px;font-size:14px;font-weight:600;cursor:pointer}
.err{background:var(--danger-soft);color:var(--danger);font-size:13px;padding:8px 12px;border-radius:8px;margin-top:12px}
.logo{width:40px;height:40px;border-radius:10px;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;margin-bottom:16px}
.theme-login{position:fixed;top:16px;right:16px;width:42px;height:42px;margin:0;padding:0;border:1px solid var(--line);border-radius:11px;background:var(--surface);color:var(--text);display:grid;place-items:center;box-shadow:var(--shadow)}
.theme-login svg{width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}