:root { --bg: #f4f5f7; --card: #fff; --text: #1d2330; --muted: #6b7280; --line: #e5e7eb; --bad: #b91c1c; --accent: #6d28d9; }
@media (prefers-color-scheme: dark) { :root { --bg: #111318; --card: #1b1e26; --text: #e8eaf0; --muted: #9aa1ad; --line: #2b2f3a; --accent: #a78bfa; } }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 16px; font: 15px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif; background: var(--bg); color: var(--text); }
.tarjeta { width: 100%; max-width: 380px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 24px; }
h1 { font-size: 22px; margin: 0 0 4px; }
.sutil { color: var(--muted); margin: 0 0 12px; }
label { display: block; margin: 12px 0; color: var(--muted); font-size: 13px; }
input { display: block; width: 100%; margin-top: 4px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--text); font: inherit; }
button { width: 100%; margin-top: 8px; padding: 10px 14px; border: 0; border-radius: 8px; background: var(--accent); color: #fff; font: inherit; font-weight: 600; cursor: pointer; }
button:disabled { opacity: .6; }
.error { color: var(--bad); min-height: 1.3em; margin: 10px 0 0; }