body {
    margin: 0;
    font-family: "Helvetica Neue", Arial, sans-serif;
    background: linear-gradient(135deg, #4a90e2, #003366);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-wrapper {
    width: 100%;
    max-width: 500px; /* ✅ 기존 400px → 600px */
    padding: 30px;
}

.login-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
    padding: 20px 40px;
    animation: fadeIn 0.8s ease-in-out;
}

.login-logo {
    max-width: 250px; /* ✅ 로고도 조금 더 키움 */
    margin-bottom: 30px;
}

.form-control {
    border-radius: 8px;
    height: 50px; /* ✅ 인풋박스 높이 확대 */
    font-size: 16px;
}

.btn {
    border-radius: 8px;
    transition: all 0.2s ease-in-out;
    font-size: 16px;
    padding: 12px;
}

.btn-primary {
    background-color: #4a90e2;
    border: none;
}

.btn-primary:hover {
    background-color: #357ab8;
}

.btn-default:hover {
    background-color: #f0f0f0;
}

.alert {
    margin-top: 25px;
    border-radius: 8px;
    animation: shake 0.4s ease-in-out;
}

/* 애니메이션 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes shake {
    0% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    50% { transform: translateX(5px); }
    75% { transform: translateX(-5px); }
    100% { transform: translateX(0); }
}