:root {
  --bg: #fafaf9; --card: #ffffff; --fg: #1c1917; --muted: #78716c; --line: #e7e5e4;
  --accent: #1c1917; --accent-fg: #fafaf9; --danger: #b91c1c; --danger-bg: #fef2f2;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0c0a09; --card: #1c1917; --fg: #fafaf9; --muted: #a8a29e; --line: #292524;
    --accent: #fafaf9; --accent-fg: #1c1917; --danger: #fca5a5; --danger-bg: #2a1212; }
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 16px;
  background: var(--bg); color: var(--fg);
  font: 15px/1.5 ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif; }
main { width: 100%; max-width: 380px; }
form { display: grid; gap: 14px; padding: 28px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; }
.brand { margin: 0; font-weight: 600; letter-spacing: -0.01em; }
h1 { margin: 0 0 4px; font-size: 20px; font-weight: 600; letter-spacing: -0.02em; }
label { display: grid; gap: 6px; font-size: 13px; font-weight: 500; }
input { font: inherit; padding: 9px 11px; border: 1px solid var(--line); border-radius: 8px; background: transparent; color: inherit; }
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button { font: inherit; font-weight: 500; padding: 10px; border: 0; border-radius: 8px; background: var(--accent); color: var(--accent-fg); cursor: pointer; margin-top: 4px; }
button:hover { opacity: .9; }
.error { margin: 0; padding: 9px 11px; border-radius: 8px; background: var(--danger-bg); color: var(--danger); font-size: 13px; }
.hint { margin: 0; color: var(--muted); font-size: 12px; text-align: center; }