* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 400px;
}

.login-box {
    background: white;
    border-radius: 20px;
    padding: 40px 30px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.logo {
    text-align: center;
    margin-bottom: 40px;
}

.logo-circle {
    width: 80px;
    height: 80px;
    background: #dc3545;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 28px;
    font-weight: bold;
    margin: 0 auto 15px;
}

.company-name {
    color: #333;
    font-size: 24px;
    font-weight: 600;
}

.login-form {
    margin-bottom: 20px;
}

.form-group {
    position: relative;
    margin-bottom: 20px;
}

.input-icon {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 18px;
    color: #999;
}

.form-group input {
    width: 100%;
    padding: 15px 15px 15px 45px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: #dc3545;
}

.error-message {
    background: #fee;
    color: #c33;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 15px;
    font-size: 14px;
    text-align: center;
}

.login-btn {
    width: 100%;
    padding: 15px;
    background: #dc3545;
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

.login-btn:hover {
    background: #c82333;
}

.login-btn:active {
    transform: scale(0.98);
}

.footer-link {
    text-align: center;
    margin-top: 20px;
}

.footer-link a {
    color: #666;
    text-decoration: underline;
    font-size: 14px;
}

.footer-link a:hover {
    color: #dc3545;
}

/* 설정 버튼 */
.settings-btn {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    background: #dc3545;
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all 0.3s;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.settings-btn:hover {
    background: #c82333;
    transform: scale(1.1);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.settings-btn:active {
    transform: scale(0.95);
}

/* 모달 스타일 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: white;
    border-radius: 15px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    animation: modalFadeIn 0.3s;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 25px;
    border-bottom: 1px solid #e0e0e0;
}

.modal-header h2 {
    margin: 0;
    color: #333;
    font-size: 20px;
}

.close-btn {
    font-size: 28px;
    font-weight: bold;
    color: #999;
    cursor: pointer;
    line-height: 1;
    transition: color 0.3s;
}

.close-btn:hover {
    color: #dc3545;
}

.modal-body {
    padding: 25px;
}

.modal-body p {
    margin-bottom: 15px;
    color: #333;
    line-height: 1.6;
}

.modal-body input[type="file"] {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    margin-bottom: 15px;
    transition: border-color 0.3s;
}

.modal-body input[type="file"]:focus {
    outline: none;
    border-color: #dc3545;
}

.upload-message {
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 15px;
    font-size: 14px;
    text-align: center;
}

.upload-message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.upload-message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.modal-buttons {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.upload-btn, .cancel-btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.upload-btn {
    background: #dc3545;
    color: white;
}

.upload-btn:hover {
    background: #c82333;
}

.upload-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.cancel-btn {
    background: #e0e0e0;
    color: #333;
}

.cancel-btn:hover {
    background: #d0d0d0;
}

@media (max-width: 480px) {
    .login-box {
        padding: 30px 20px;
    }
    
    .logo-circle {
        width: 60px;
        height: 60px;
        font-size: 22px;
    }
    
    .company-name {
        font-size: 20px;
    }
    
    .settings-btn {
        width: 45px;
        height: 45px;
        font-size: 20px;
        top: 15px;
        right: 15px;
    }
    
    .modal-content {
        width: 95%;
        margin: 20px;
    }
    
    .modal-header, .modal-body {
        padding: 15px;
    }
}