:root { color-scheme: light dark; --bg: #f6f4ef; --ink: #1d1b18; --line: #cfc9bd; --card: #fff; --accent: #1d1b18; --err: #a32a2a; }
@media (prefers-color-scheme: dark) { :root { --bg: #151412; --ink: #f1ede4; --line: #3a3732; --card: #1f1d1a; --accent: #f1ede4; --err: #ff8f8f; } }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: var(--bg); color: var(--ink); font: 16px/1.6 system-ui, "Segoe UI", Tahoma, sans-serif; }
main { width: min(92vw, 360px); background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 28px 24px; }
h1 { margin: 0 0 4px; font-size: 20px; }
p.sub { margin: 0 0 20px; opacity: .7; font-size: 14px; }
label { display: block; margin-bottom: 6px; font-weight: 600; }
input { width: 100%; padding: 12px; font: inherit; letter-spacing: .08em; direction: ltr; text-align: center; border: 1px solid var(--line); border-radius: 10px; background: transparent; color: inherit; }
input:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button { width: 100%; margin-top: 14px; padding: 12px; font: inherit; font-weight: 600; border: 0; border-radius: 10px; background: var(--accent); color: var(--bg); cursor: pointer; }
.err { margin: 12px 0 0; color: var(--err); font-size: 14px; }