body {
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    overflow: hidden;
    font-family: 'Pretendard', -apple-system, sans-serif;
}

.hero-video {
    position: fixed;
    top: 50%; left: 50%;
    min-width: 100%; min-height: 100%;
    width: auto; height: auto;
    z-index: -2;
    transform: translate(-50%, -50%);
    object-fit: cover;
}

.video-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: -1;
}

.login-slogan {
    color: #ffffff;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 30px;
    z-index: 1;
    text-align: center;
    text-shadow: 2px 2px 10px rgba(0,0,0,0.5);
}

.login-card {
    background: rgba(255, 255, 255, 0.95);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
    width: 90%; 
    max-width: 380px; 
    text-align: center;
    z-index: 10;
    backdrop-filter: blur(10px);
    
    display: flex;
    flex-direction: column;
    align-items: stretch; /* 자식들이 좌우로 꽉 차게 */
    margin: 0 auto; /* 수평 중앙 정렬 */
}

.login-card img {
    height: 40px; 
    width: auto; 
    align-self: center;
    margin-bottom: 20px;
    object-fit: contain; 
}

.input-group {
    text-align: left;
    margin-bottom: 20px;
    width: 100%;
}
.input-group label {
    display: block; font-size: 13px; font-weight: 600;
    margin-bottom: 5px; color: #333;
}

.login-input {
    width: 100%; 
    padding: 14px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    box-sizing: border-box; 
    outline: none;
    transition: border-color 0.3s;
}

.login-input:focus {
    border-color: #007bff;
}

.btn-login-submit {
    width: 100%;
    padding: 15px;
    background: #007bff;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    box-sizing: border-box; 
    transition: background 0.3s;
}

.btn-login-submit:hover { background: #0056b3; }

.error-text { color: #ff4d4d; font-size: 13px; margin-top: 15px; display: none; }
.back-home { display: inline-block; margin-top: 20px; color: #666; text-decoration: none; font-size: 13px; }