:root {
  --bg: #f7f9fc;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #3b82f6;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, .05), 0 2px 4px -2px rgba(0, 0, 0, .05);
  --radius: .75rem;
  --font: "Inter", system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --card: #111827;
    --text: #f9fafb;
    --muted: #9ca3af;
    --border: #374151;
  }
}

* { box-sizing: border-box; }
body { margin: 0; font-family: var(--font); background: var(--bg); color: var(--text); }

.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 2rem; }
.container { width: 100%; max-width: 28rem; }

.login-card {
  background: var(--card);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.login-card h1 { margin: 0 0 1rem 0; font-size: 1.25rem; }

form { display: grid; gap: .75rem; }
label { font-weight: 600; font-size: .9rem; color: var(--text); }
input[type="text"], input[type="password"] {
  padding: .65rem .75rem; border: 1px solid var(--border); border-radius: .5rem; background: transparent; color: var(--text); font-family: inherit; font-size: 1rem;
}

input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(59, 130, 246, .12); }

.btn { padding: .55rem 1rem; border-radius: .5rem; font-weight: 600; display: inline-flex; gap: .4rem; align-items: center; cursor: pointer; }
.btn-primary { background: var(--accent); color: #fff; border: none; }

#message { margin-top: .75rem; color: var(--danger); min-height: 1.25rem; }

@media (max-width: 420px) {
  .container { padding: 0 1rem; }
}