:root {
  --bg: #f6f7f9; --fg: #1f2329; --muted: #8a94a6;
  --border: #e1e5ea; --accent: #2f6df6; --danger: #e0483d; --card: #fff;
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: flex; align-items: center; justify-content: center;
  font-family: -apple-system, Segoe UI, Roboto, sans-serif; background: var(--bg); color: var(--fg);
}
.login-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 28px; width: min(360px, 92vw); box-shadow: 0 10px 40px rgba(0,0,0,.08);
  display: flex; flex-direction: column; gap: 14px;
}
.login-card h1 { margin: 0; font-size: 20px; }
.login-card .sub { margin: -8px 0 4px; color: var(--muted); font-size: 13px; }
.login-card label { display: flex; flex-direction: column; gap: 5px; font-size: 12px; color: var(--muted); }
.login-card input {
  font: inherit; padding: 10px 12px; border: 1px solid var(--border);
  border-radius: 8px; color: var(--fg); background: var(--card);
}
.login-card input:focus { outline: 2px solid var(--accent); border-color: var(--accent); }
.login-card button {
  font: inherit; margin-top: 6px; padding: 11px; border: none; border-radius: 8px;
  background: var(--accent); color: #fff; cursor: pointer; font-weight: 600;
}
.login-card button:hover { filter: brightness(1.05); }
.login-card .err {
  background: #fbeae8; color: var(--danger); padding: 9px 12px; border-radius: 8px; font-size: 13px;
}