/* ========== Global Styles ========== */
:root {
    --primary: #667eea;
    --primary-dark: #5568d3;
    --secondary: #764ba2;
    --text-dark: #1a202c;
    --text-gray: #4a5568;
    --text-light: #718096;
    --bg-light: #f7fafc;
    --bg-white: #ffffff;
    --border: #e2e8f0;
    --success: #48bb78;
    --danger: #f56565;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 
                 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* ========== Navigation ========== */
.nav-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    z-index: 1000;
    padding: 15px 0;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
}

.logo i {
    color: var(--primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-gray);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--primary);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 10px 24px;
    border-radius: 8px;
    transition: all 0.3s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

/* ========== Hero Section ========== */
.hero {
    padding: 120px 0 60px;
    background: linear-gradient(135deg, #f7fafc 0%, #edf2f7 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 20px;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-gray);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 40px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 36px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 14px;
    color: var(--text-gray);
    margin-top: 5px;
}

.hero-cta {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
}

.btn-hero {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 16px 32px;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-hero:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.btn-demo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: white;
    color: var(--primary);
    padding: 16px 32px;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 600;
    text-decoration: none;
    border: 2px solid var(--border);
    transition: all 0.3s;
}

.btn-demo:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
}

.hero-trust {
    color: var(--text-light);
    font-size: 14px;
}

.hero-trust i {
    color: var(--success);
    margin-right: 5px;
}

.product-screenshot {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.product-screenshot img {
    width: 100%;
    display: block;
}

.screenshot-badge {
    position: absolute;
    bottom: 20px;
    right: 20px;
    background: white;
    padding: 12px 20px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.screenshot-badge i {
    color: var(--success);
}

/* ========== Features Section ========== */
.features {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 15px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-gray);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background: white;
    border: 2px solid var(--border);
    border-radius: 16px;
    padding: 30px;
    transition: all 0.3s;
}

.feature-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.15);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 28px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-gray);
    margin-bottom: 20px;
    line-height: 1.8;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-gray);
    margin-bottom: 8px;
}

.feature-list i {
    color: var(--success);
}

/* ========== How It Works ========== */
.how-it-works {
    padding: 80px 0;
    background: var(--bg-light);
}

.steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 30px;
    margin-top: 60px;
}

.step {
    background: white;
    border-radius: 16px;
    padding: 40px 30px;
    text-align: center;
    flex: 1;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 700;
    margin: 0 auto 20px;
}

.step h3 {
    font-size: 22px;
    margin-bottom: 10px;
}

.step p {
    color: var(--text-gray);
}

.step-arrow {
    color: var(--primary);
    font-size: 32px;
}

/* ========== Pricing ========== */
.pricing {
    padding: 80px 0;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 60px;
}

.pricing-card {
    background: white;
    border: 2px solid var(--border);
    border-radius: 16px;
    padding: 40px 30px;
    text-align: center;
    position: relative;
    transition: all 0.3s;
}

.pricing-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.pricing-card.featured {
    border-color: var(--primary);
    box-shadow: 0 10px 40px rgba(102, 126, 234, 0.2);
}

.popular-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 6px 20px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.plan-name {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 15px;
}

.plan-price {
    font-size: 48px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 30px;
}

.plan-price span {
    font-size: 18px;
    color: var(--text-gray);
}

.plan-features {
    list-style: none;
    margin-bottom: 30px;
    text-align: left;
}

.plan-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-gray);
    margin-bottom: 12px;
}

.plan-features i {
    color: var(--success);
}

.btn-plan {
    display: block;
    background: white;
    color: var(--primary);
    border: 2px solid var(--primary);
    padding: 14px 32px;
    border-radius: 10px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
}

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

.btn-plan.primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
}

.btn-plan.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

/* ========== Download ========== */
.download {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    text-align: center;
}

.download h2 {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 15px;
}

.download p {
    font-size: 20px;
    margin-bottom: 40px;
}

.download-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 30px;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: white;
    color: var(--primary);
    padding: 18px 40px;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
}

.btn-download:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.download-note {
    font-size: 14px;
    opacity: 0.9;
}

/* ========== FAQ ========== */
.faq {
    padding: 80px 0;
    background: var(--bg-light);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 15px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.faq-question {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.faq-question i {
    color: var(--primary);
}

.faq-answer {
    color: var(--text-gray);
    line-height: 1.8;
}

/* ========== Footer ========== */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 15px;
}

.footer-logo i {
    color: var(--primary);
}

.footer-section p {
    color: #a0aec0;
    margin-bottom: 20px;
}

.footer-section h4 {
    font-size: 16px;
    margin-bottom: 15px;
}

.footer-section a {
    display: block;
    color: #a0aec0;
    text-decoration: none;
    margin-bottom: 10px;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: var(--primary);
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.social-links a:hover {
    background: var(--primary);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #a0aec0;
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .steps {
        flex-direction: column;
    }
    
    .step-arrow {
        transform: rotate(90deg);
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .nav-links {
        display: none;
    }
}

/* ========== Enhanced Hero Visual ========== */
.product-demo {
    position: relative;
}

.demo-video {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    cursor: pointer;
    transition: transform 0.3s;
}

.demo-video:hover {
    transform: scale(1.02);
}

.demo-video img {
    width: 100%;
    display: block;
}

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 32px;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
    transition: all 0.3s;
}

.demo-video:hover .play-button {
    transform: translate(-50%, -50%) scale(1.1);
    box-shadow: 0 12px 35px rgba(102, 126, 234, 0.5);
}

.video-badge {
    position: absolute;
    bottom: 20px;
    left: 20px;
    background: white;
    padding: 10px 18px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    font-weight: 600;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.video-badge i {
    color: var(--primary);
}

.feature-preview {
    display: flex;
    gap: 10px;
    margin-top: 20px;
    justify-content: center;
}

.preview-item {
    background: white;
    border: 2px solid var(--border);
    padding: 12px 20px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-gray);
    transition: all 0.3s;
    cursor: pointer;
}

.preview-item:hover,
.preview-item.active {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(102, 126, 234, 0.05);
}

.preview-item i {
    font-size: 16px;
}

/* ========== Interactive Demo Section ========== */
.interactive-demo {
    padding: 80px 0;
    background: var(--bg-light);
}

.demo-showcase {
    margin-top: 60px;
}

.demo-tabs {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.demo-tab {
    background: white;
    border: 2px solid var(--border);
    padding: 15px 30px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-gray);
    cursor: pointer;
    transition: all 0.3s;
}

.demo-tab:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.demo-tab.active {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.demo-tab i {
    font-size: 20px;
}

.demo-content {
    position: relative;
}

.demo-panel {
    display: none;
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.demo-panel.active {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 0;
}

.demo-visual {
    position: relative;
    background: var(--bg-light);
}

.demo-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.demo-hint {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 10px 16px;
    border-radius: 10px;
    font-size: 13px;
    color: var(--text-gray);
    display: flex;
    align-items: center;
    gap: 6px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.demo-hint i {
    color: #fbbf24;
}

.demo-description {
    padding: 40px;
}

.demo-description h3 {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.demo-description p {
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 30px;
}

.demo-features {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.demo-feature-item {
    display: flex;
    gap: 15px;
    align-items: flex-start;
}

.demo-feature-item i {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.demo-feature-item div {
    flex: 1;
}

.demo-feature-item strong {
    display: block;
    font-size: 16px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 4px;
}

.demo-feature-item span {
    font-size: 14px;
    color: var(--text-gray);
}

/* ========== Enhanced Feature Cards ========== */
.feature-card.highlight {
    border-color: var(--primary);
    box-shadow: 0 10px 40px rgba(102, 126, 234, 0.15);
    position: relative;
}

.feature-badge {
    position: absolute;
    top: -12px;
    right: 20px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 4px 14px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ========== Technology Section ========== */
.technology {
    padding: 80px 0;
    background: white;
}

.tech-content {
    margin-top: 60px;
}

.tech-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.tech-step {
    background: white;
    border: 2px solid var(--border);
    border-radius: 16px;
    padding: 30px 20px;
    text-align: center;
    flex: 1;
    min-width: 180px;
    max-width: 220px;
    transition: all 0.3s;
}

.tech-step:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.15);
}

.tech-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 32px;
    margin: 0 auto 20px;
}

.tech-step h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.tech-step p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
}

.tech-arrow {
    color: var(--primary);
    font-size: 32px;
    font-weight: 700;
}

.tech-details {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.tech-detail-card {
    background: var(--bg-light);
    border-radius: 16px;
    padding: 35px;
    text-align: center;
    transition: all 0.3s;
}

.tech-detail-card:hover {
    background: white;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transform: translateY(-5px);
}

.tech-detail-card i {
    font-size: 42px;
    color: var(--primary);
    margin-bottom: 20px;
}

.tech-detail-card h4 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.tech-detail-card p {
    color: var(--text-gray);
    line-height: 1.8;
    font-size: 15px;
}

/* ========== Installation Section ========== */
.installation {
    padding: 80px 0;
    background: var(--bg-light);
}

.install-steps {
    display: flex;
    gap: 20px;
    margin: 60px 0 40px;
    justify-content: center;
    flex-wrap: wrap;
}

.install-step {
    background: white;
    border: 2px solid var(--border);
    border-radius: 16px;
    padding: 30px 20px;
    text-align: center;
    flex: 1;
    min-width: 160px;
    max-width: 200px;
    position: relative;
    transition: all 0.3s;
}

.install-step:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.15);
}

.install-step .step-number {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 700;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.step-visual {
    width: 60px;
    height: 60px;
    background: var(--bg-light);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: var(--primary);
    font-size: 28px;
}

.install-step h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.install-step p {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.6;
}

.install-help {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.btn-help {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 14px 28px;
    border-radius: 10px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-help:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-help.secondary {
    background: white;
    color: var(--primary);
    border: 2px solid var(--primary);
    box-shadow: none;
}

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

/* ========== Responsive Updates ========== */
@media (max-width: 768px) {
    .demo-panel.active {
        grid-template-columns: 1fr;
    }
    
    .demo-tabs {
        flex-direction: column;
    }
    
    .demo-tab {
        width: 100%;
        justify-content: center;
    }
    
    .tech-diagram {
        flex-direction: column;
    }
    
    .tech-arrow {
        transform: rotate(90deg);
    }
    
    .tech-details {
        grid-template-columns: 1fr;
    }
    
    .install-steps {
        flex-direction: column;
        align-items: stretch;
    }
    
    .install-step {
        max-width: none;
    }
    
    .feature-preview {
        flex-direction: column;
    }
}