:root { --bg: #f5f6f8; --card: #fff; --fg: #15181d; --line: #e3e6ea; --accent: #2f5bea; }
@media (prefers-color-scheme: dark) { :root { --bg: #0f1216; --card: #181c22; --fg: #e8eaed; --line: #2a3038; --accent: #7c9bff; } }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: var(--bg); color: var(--fg); font: 15px system-ui, sans-serif; padding: 16px; }
form { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 24px; width: 100%; max-width: 340px; display: grid; gap: 12px; }
h1 { margin: 0 0 4px; font-size: 20px; }
input { font: inherit; padding: 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--bg); color: var(--fg); }
button { font: inherit; padding: 10px; border-radius: 8px; border: 0; background: var(--accent); color: #fff; cursor: pointer; }
.err { color: #c62828; margin: 0; }