:root { --bg: #f2f3f1; --card: #fff; --ink: #1c2321; --line: #cfd4d0; --accent: #14532d; --bad: #b42318; }
@media (prefers-color-scheme: dark) { :root { --bg: #141816; --card: #1e2421; --ink: #e8ebe9; --line: #3a423e; --accent: #4ade80; --bad: #f97066; } }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 16px; background: var(--bg); color: var(--ink); font: 16px/1.5 Bahnschrift, "Segoe UI", system-ui, sans-serif; }
.card { width: 100%; max-width: 380px; padding: 24px; background: var(--card); border: 1px solid var(--line); border-radius: 8px; }
h1 { margin: 0 0 16px; font-size: 22px; }
label { display: block; margin-bottom: 12px; }
input { display: block; width: 100%; margin-top: 4px; padding: 10px; font: inherit; color: inherit; background: transparent; border: 1px solid var(--line); border-radius: 6px; }
button { padding: 10px 16px; font: inherit; color: var(--card); background: var(--accent); border: 0; border-radius: 6px; cursor: pointer; }
#err { margin: 12px 0 0; color: var(--bad); }