* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-grad-1: #1e293b;
  --bg-grad-2: #0f172a;
  --surface: #ffffff;
  --text: #0f172a;
  --text-soft: #64748b;
  --border: #e2e8f0;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-disabled: #94a3b8;
  --danger: #dc2626;
  --shadow: 0 25px 50px -12px rgba(0,0,0,0.4);
}

[data-theme="dark"] {
  --bg-grad-1: #020617;
  --bg-grad-2: #0b1220;
  --surface: #131b2c;
  --text: #e5e7eb;
  --text-soft: #94a3b8;
  --border: #283149;
  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --primary-disabled: #475569;
  --danger: #f87171;
  --shadow: 0 25px 50px -12px rgba(0,0,0,0.7);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: linear-gradient(135deg, var(--bg-grad-1) 0%, var(--bg-grad-2) 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  color: var(--text);
}

.login-card {
  background: var(--surface);
  padding: 2.5rem;
  border-radius: 14px;
  box-shadow: var(--shadow);
  width: 100%;
  max-width: 380px;
  border: 1px solid var(--border);
}
.login-card h1 {
  font-size: 1.5rem;
  color: var(--text);
  text-align: center;
  margin-bottom: 0.5rem;
}
.subtitle {
  color: var(--text-soft);
  text-align: center;
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.login-prefs {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}
.login-prefs select,
.login-prefs button {
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 6px;
  font-size: 0.85rem;
  color: var(--text-soft);
  cursor: pointer;
  font-family: inherit;
}
.login-prefs button {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}

form { display: flex; flex-direction: column; gap: 0.75rem; }
input[type="password"] {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--surface);
  color: var(--text);
  color-scheme: light dark;
}
input:focus { outline: none; border-color: var(--primary); }
button[type="submit"] {
  padding: 0.75rem 1rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s;
}
button[type="submit"]:hover { background: var(--primary-hover); }
button[type="submit"]:disabled { background: var(--primary-disabled); cursor: not-allowed; }
.error {
  color: var(--danger);
  font-size: 0.875rem;
  min-height: 1.2em;
  text-align: center;
}