body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background-color: var(--bg-color);
}
.login-container {
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    width: 100%;
    max-width: 400px;
}
.login-title {
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
    font-size: 1.8rem;
    background: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-align: center;
    margin-bottom: 2rem;
}
.form-group {
    margin-bottom: 1.5rem;
}
.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    font-size: 1rem;
}
.btn-login {
    width: 100%;
    padding: 0.75rem;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
}
.error-message {
    color: #ef4444;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    text-align: center;
}
.text-success {
    color: #10b981;
}

.info-message {
    /* [코드 설명 주석] 등록된 사용자가 없을 때 나타나는 안내 배너의 스타일 정의 */
    color: #4f46e5;
    background-color: #eef2ff;
    border: 1px solid #c7d2fe;
    border-radius: 12px;
    padding: 0.75rem 1rem;
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
    text-align: center;
    line-height: 1.4;
}