:root { --bg: #f4f5f7; --card: #fff; --text: #1a1d23; --muted: #626a77; --border: #d9dde3; --primary: #2f5bd8; color-scheme: light dark; }
@media (prefers-color-scheme: dark) { :root { --bg: #0f1115; --card: #181b21; --text: #e7e9ee; --muted: #9aa2ae; --border: #2a2f38; --primary: #5b82f0; } }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: var(--bg); color: var(--text); font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; padding: 16px; }
.card { width: 100%; max-width: 360px; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 32px 28px; }
h1 { font-size: 20px; margin: 0 0 20px; font-weight: 600; }
label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 14px; }
input { display: block; width: 100%; margin-top: 6px; padding: 10px 12px; font: inherit; color: var(--text); background: transparent; border: 1px solid var(--border); border-radius: 8px; }
input:focus { outline: 2px solid var(--primary); outline-offset: 1px; border-color: transparent; }
button { width: 100%; margin-top: 6px; padding: 10px; font: inherit; font-weight: 600; color: #fff; background: var(--primary); border: 0; border-radius: 8px; cursor: pointer; }
button:hover { filter: brightness(1.08); }
.err { margin: 0 0 16px; padding: 8px 12px; border-radius: 8px; font-size: 13px; background: #d93a3a1a; color: #c43030; }