* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #ffffff 0%, #3386bf 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 450px;
}

.login-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.login-header {
    background: linear-gradient(135deg, #2c3e50, #3498db);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 15px;
}

.logo i {
    font-size: 2.5rem;
    background: rgba(255, 255, 255, 0.2);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 600;
}

.subtitle {
    opacity: 0.9;
    font-size: 0.95rem;
    margin-top: 5px;
}

.login-body {
    padding: 30px;
}

.tabs {
    display: flex;
    margin-bottom: 25px;
    border-bottom: 2px solid #e1e8ed;
}

.tab {
    flex: 1;
    padding: 15px;
    border: none;
    background: none;
    font-size: 1rem;
    font-weight: 600;
    color: #7f8c8d;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
}

.tab.active {
    color: #3498db;
}

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: #3498db;
}

.login-form {
    display: none;
}

.login-form.active {
    display: block;
}

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

.form-group label {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
    font-weight: 600;
    color: #2c3e50;
    font-size: 0.95rem;
}

.form-control {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid #e1e8ed;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s;
    background: #f8f9fa;
}

.form-control:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
    background: white;
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%237f8c8d' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

.form-options {
    margin-bottom: 25px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 0.95rem;
    color: #2c3e50;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    border: 2px solid #3498db;
    cursor: pointer;
}

.error-message {
    background: #fee;
    color: #e74c3c;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.9rem;
    border: 1px solid #fadbd8;
    display: none;
}

.error-message:not(:empty) {
    display: block;
}

.btn {
    padding: 14px 20px;
    border-radius: 10px;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-block {
    width: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #2980b9, #2573a7);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.3);
}

.btn-secondary {
    background: #f8f9fa;
    color: #2c3e50;
    border: 2px solid #e1e8ed;
}

.btn-secondary:hover {
    background: #e9ecef;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.viewer-info {
    text-align: center;
    margin-bottom: 30px;
}

.viewer-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 2rem;
    color: #3498db;
}

.viewer-info h3 {
    color: #2c3e50;
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.viewer-info p {
    color: #7f8c8d;
    line-height: 1.5;
    margin-bottom: 20px;
}

.viewer-details {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    text-align: left;
    margin-top: 20px;
}

.viewer-details p {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.viewer-details p:last-child {
    margin-bottom: 0;
}

.viewer-details i {
    color: #3498db;
    width: 20px;
}

.login-footer {
    padding: 20px;
    text-align: center;
    color: #7f8c8d;
    font-size: 0.9rem;
    border-top: 1px solid #e1e8ed;
}

@media (max-width: 480px) {
    .login-container {
        padding: 10px;
    }
    
    .login-header {
        padding: 30px 20px;
    }
    
    .login-body {
        padding: 20px;
    }
    
    .logo {
        flex-direction: column;
        gap: 10px;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
}