:root {
    --primary: #4361ee;
    --primary-dark: #3a56d4;
    --secondary: #7209b7;
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
    --gray-light: #e9ecef;
    --success: #4cc9f0;
    --warning: #f72585;
    --border-radius: 10px;
    --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

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

body {
    background-color: #f5f7ff;
    color: var(--dark);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 30px 0;
    margin-bottom: 30px;
}

header h1 {
    color: var(--primary);
    margin-bottom: 10px;
    font-size: 2.5rem;
}

header p {
    color: var(--gray);
    max-width: 700px;
    margin: 0 auto;
    font-size: 1.1rem;
}

.utm-badge {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 5px 15px;
    border-radius: 50px;
    display: inline-block;
    font-weight: 600;
    margin-top: 10px;
    font-size: 0.9rem;
}

.main-layout {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    margin-bottom: 40px;
}

.form-section {
    flex: 1;
    min-width: 300px;
    background: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--box-shadow);
}

.preview-section {
    flex: 1;
    min-width: 300px;
    background: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--box-shadow);
    display: flex;
    flex-direction: column;
}

.section-title {
    display: flex;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--gray-light);
}

.section-title i {
    color: var(--primary);
    margin-right: 10px;
    font-size: 1.2rem;
}

.section-title h2 {
    color: var(--dark);
    font-size: 1.5rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark);
}

.form-group .required {
    color: var(--warning);
}

.form-control {
    width: 100%;
    padding: 14px;
    border: 2px solid var(--gray-light);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

.form-help {
    font-size: 0.85rem;
    color: var(--gray);
    margin-top: 6px;
    display: block;
}

.utm-params {
    background-color: var(--gray-light);
    padding: 20px;
    border-radius: var(--border-radius);
    margin-top: 30px;
}

.utm-param {
    margin-bottom: 15px;
}

.utm-param:last-child {
    margin-bottom: 0;
}

.preview-box {
    flex-grow: 1;
    background-color: #f8f9fa;
    border: 2px dashed #ccc;
    border-radius: var(--border-radius);
    padding: 20px;
    overflow-wrap: break-word;
    word-break: break-all;
    margin-bottom: 25px;
    font-family: monospace;
    font-size: 1rem;
    line-height: 1.5;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--gray);
}

.preview-box.active {
    border-color: var(--success);
    background-color: rgba(76, 201, 240, 0.05);
    color: var(--dark);
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 20px;
}

.btn {
    padding: 14px 28px;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--gray-light);
    color: var(--dark);
}

.btn-secondary:hover {
    background-color: #dde1e7;
}

.btn-success {
    background-color: var(--success);
    color: white;
}

.btn-success:hover {
    background-color: #3ab4d6;
}

.btn-copy {
    flex-grow: 1;
}

.history-section {
    background: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--box-shadow);
    margin-bottom: 40px;
}

.history-list {
    max-height: 300px;
    overflow-y: auto;
    margin-top: 20px;
    border: 1px solid var(--gray-light);
    border-radius: var(--border-radius);
}

.history-item {
    padding: 15px;
    border-bottom: 1px solid var(--gray-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.history-item:last-child {
    border-bottom: none;
}

.history-url {
    font-family: monospace;
    font-size: 0.9rem;
    color: var(--dark);
    max-width: 70%;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-actions {
    display: flex;
    gap: 10px;
}

.history-btn {
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
}

.history-btn:hover {
    color: var(--primary-dark);
}

.empty-history {
    text-align: center;
    padding: 40px 20px;
    color: var(--gray);
}

.utm-tag {
    display: inline-block;
    background-color: var(--primary);
    color: white;
    padding: 3px 10px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-right: 5px;
    margin-bottom: 5px;
}

footer {
    text-align: center;
    padding: 30px 0;
    color: var(--gray);
    border-top: 1px solid var(--gray-light);
    margin-top: 30px;
}

.campaign-types {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 10px;
    margin-top: 10px;
}

.campaign-type {
    padding: 10px;
    border: 2px solid var(--gray-light);
    border-radius: var(--border-radius);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

.campaign-type:hover {
    border-color: var(--primary);
}

.campaign-type.selected {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 25px;
    background-color: var(--success);
    color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    display: flex;
    align-items: center;
    gap: 10px;
    transform: translateX(150%);
    transition: transform 0.5s ease;
    z-index: 1000;
}

.notification.show {
    transform: translateX(0);
}

.notification.warning {
    background-color: var(--warning);
}

.short-url {
    color: var(--primary);
    font-weight: 600;
    text-decoration: underline;
}

@media (max-width: 768px) {
    .main-layout {
        flex-direction: column;
    }
    
    .actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .history-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .history-url {
        max-width: 100%;
    }
    
    .history-actions {
        align-self: flex-end;
    }
    
    .campaign-types {
        grid-template-columns: repeat(2, 1fr);
    }
}