:root {
    --primary-color: #106b9a;
    --background: #f4f6f8;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --border-color: #e2e8f0;
    --error-color: #ef4444;
}
body { font-family: 'Inter', sans-serif; background: var(--background); padding: 40px 20px; color: var(--text-color); margin: 0;}
.container { max-width: 600px; margin: auto; background: var(--card-bg); padding: 40px; border-radius: 12px; box-shadow: 0 4px 12px rgba(0,0,0,0.03); border: 1px solid var(--border-color); }
h1 { margin-top: 0; font-size: 28px; color: var(--primary-color); margin-bottom: 30px; }
.form-group { margin-bottom: 20px; }
label { display: block; font-weight: 600; margin-bottom: 8px; font-size: 14px; }
input[type="text"], input[type="email"], select, textarea { width: 100%; padding: 12px; border: 1.5px solid #cbd5e1; border-radius: 6px; box-sizing: border-box; font-family: 'Inter', sans-serif; font-size: 15px;}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--primary-color); box-shadow: 0 0 0 4px rgba(16, 107, 154, 0.1); }
input:disabled, select:disabled, textarea:disabled { background: #f1f5f9; cursor: not-allowed; color: #64748b; }
button { background: var(--primary-color); color: white; padding: 14px 24px; border: none; border-radius: 6px; cursor: pointer; font-weight: 600; font-size: 16px; width: 100%; transition: background 0.2s;}
button:hover { background: #0c567a; }
button:disabled { background: #94a3b8; cursor: not-allowed; }
.error-text { color: var(--error-color); font-size: 13px; margin-top: 5px; display: block; }
.alert-success { background: #d1fae5; color: #065f46; padding: 20px; border-radius: 6px; margin-bottom: 20px; border: 1px solid #34d399;}
.alert-error { background: #fee2e2; color: #991b1b; padding: 15px; border-radius: 6px; margin-bottom: 20px; border: 1px solid #f87171;}
.alert-locked { background: #fffbeb; color: #b45309; padding: 20px; border-radius: 6px; margin-bottom: 20px; border: 1px solid #fcd34d; font-size: 15px;}