:root { color-scheme: light dark; --bg: #f4f6f8; --fg: #1d2733; --card: #fff; --accent: #1b6ec2; --err: #b00020; --ok: #0a6b0a; --muted: #5b6b7b; }
@media (prefers-color-scheme: dark) { :root { --bg: #11161c; --fg: #e6edf3; --card: #1a222b; --accent: #5aa2ee; --err: #ff6b81; --ok: #5fd38d; --muted: #9aa9b8; } }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: var(--bg); color: var(--fg); font: 15px/1.45 system-ui, "Segoe UI", sans-serif; }
main { width: min(92vw, 380px); background: var(--card); padding: 28px 24px; border-radius: 10px; box-shadow: 0 2px 14px rgba(0, 0, 0, .12); }
h1 { margin: 0 0 4px; font-size: 20px; }
p.sub { margin: 0 0 18px; color: var(--muted); }
label { display: block; margin: 12px 0 4px; font-size: 13px; color: var(--muted); }
input { width: 100%; padding: 10px; font: inherit; border: 1px solid var(--muted); border-radius: 6px; background: transparent; color: inherit; }
button { width: 100%; margin-top: 18px; padding: 11px; font: inherit; font-weight: 600; border: 0; border-radius: 6px; background: var(--accent); color: #fff; cursor: pointer; }
button:disabled { opacity: .55; cursor: default; }
#msg { min-height: 1.4em; margin-top: 14px; }
#msg.err { color: var(--err); } #msg.ok { color: var(--ok); }