:root { --bg: #f5f7fb; --card: #fff; --text: #0f172a; --muted: #64748b; --primary: #1d4ed8; --danger: #dc2626; --ok: #059669; --line: #e2e8f0; }
@media (prefers-color-scheme: dark) { :root { --bg: #0b1220; --card: #111a2e; --text: #e2e8f0; --muted: #94a3b8; --primary: #60a5fa; --line: #1e293b; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
.brand { display: inline-block; font-weight: 800; font-size: 20px; color: var(--primary); text-decoration: none; margin-bottom: 16px; }
h1 { font-size: 30px; line-height: 1.2; margin: 8px 0 12px; }
h2 { font-size: 20px; margin: 28px 0 8px; }
a { color: var(--primary); }
.muted { color: var(--muted); font-size: 14px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; display: grid; gap: 14px; margin: 20px 0; }
label { display: grid; gap: 6px; font-weight: 600; font-size: 14px; }
label.check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; }
input[type=email], input[type=password] { font: inherit; padding: 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--text); width: 100%; }
button { font: inherit; font-weight: 700; padding: 12px; border: 0; border-radius: 10px; cursor: pointer; color: #fff; background: var(--primary); }
button.danger { background: var(--danger); }
button:disabled { opacity: .6; cursor: wait; }
#msg.ok { color: var(--ok); } #msg.err { color: var(--danger); }