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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --dark-color: #1e293b;
    --light-color: #f8fafc;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #334155;
    background-color: #f1f5f9;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Breadcrumb */
.breadcrumb {
    background: white;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.breadcrumb .container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s;
}

.breadcrumb a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.breadcrumb .current {
    color: var(--secondary-color);
    font-weight: 500;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: bold;
}

.logo i {
    font-size: 2rem;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
}

.nav a:hover {
    opacity: 0.8;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    color: white;
    padding: 5rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.25rem;
    color: #94a3b8;
    margin-bottom: 2rem;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
}

.hero-features .feature {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.hero-features .feature i {
    font-size: 2.5rem;
    color: #60a5fa;
}

.hero-features .feature span {
    font-size: 0.9rem;
    color: #cbd5e1;
}

/* Section Title */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--dark-color);
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border-radius: 2px;
}

/* Filter Tabs */
.filter-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 0.75rem 2rem;
    border: 2px solid var(--border-color);
    background: white;
    color: var(--secondary-color);
    font-size: 1rem;
    font-weight: 500;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s;
}

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

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

/* Products Section */
.products {
    padding: 5rem 0;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.product-card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.product-header {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    padding: 1.5rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 0.75rem;
    background: var(--primary-color);
    color: white;
}

.badge.blue { background: #3b82f6; }
.badge.purple { background: #8b5cf6; }
.badge.orange { background: #f97316; }
.badge.gold { background: #eab308; }
.badge.red { background: #ef4444; }
.badge.green { background: #10b981; }

.product-header h3 {
    font-size: 1.5rem;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

.product-header .specs {
    color: var(--secondary-color);
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.product-header .freq {
    color: var(--primary-color);
    font-size: 0.85rem;
    font-weight: 500;
}

.product-plans {
    padding: 1rem;
    flex: 1;
}

.plan {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    transition: background 0.3s;
}

.plan:last-child {
    border-bottom: none;
}

.plan:hover {
    background: #f8fafc;
    border-radius: 8px;
}

.plan-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.plan-name {
    font-weight: 600;
    color: var(--dark-color);
}

.defense {
    font-size: 0.8rem;
    color: var(--success-color);
}

.defense.highlight {
    color: var(--danger-color);
    font-weight: 600;
}

.price {
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--primary-color);
}

.price span {
    font-size: 0.8rem;
    color: var(--secondary-color);
    font-weight: normal;
}

.btn-order {
    width: calc(100% - 2rem);
    margin: 0 1rem 1rem;
    padding: 0.875rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-order:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
}

/* Upgrade Section */
.upgrade {
    background: white;
    padding: 5rem 0;
}

.upgrade-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.upgrade-card {
    background: #f8fafc;
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.upgrade-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.upgrade-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.upgrade-icon i {
    font-size: 2rem;
    color: white;
}

.upgrade-card h3 {
    font-size: 1.25rem;
    color: var(--dark-color);
    margin-bottom: 1rem;
}

.upgrade-card ul {
    list-style: none;
    text-align: left;
}

.upgrade-card li {
    padding: 0.5rem 0;
    border-bottom: 1px dashed var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.upgrade-card li:last-child {
    border-bottom: none;
}

.upgrade-card strong {
    color: var(--primary-color);
}

/* Features Section */
.features {
    padding: 5rem 0;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2.5rem;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    color: var(--dark-color);
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--secondary-color);
}

/* Footer */
.footer {
    background: var(--dark-color);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h4 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: #60a5fa;
}

.footer-section p {
    margin-bottom: 0.75rem;
    color: #94a3b8;
}

.footer-section i {
    margin-right: 0.5rem;
    color: #60a5fa;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #334155;
    color: #64748b;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-features {
        gap: 1.5rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .nav {
        display: none;
    }
    
    .filter-tabs {
        gap: 0.5rem;
    }
    
    .tab-btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
}

/* Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.product-card {
    animation: fadeIn 0.5s ease-out;
}

/* Hidden class for filtering */
.product-card.hidden {
    display: none;
}

/* Customer Service Floating Window */
.service-float {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    padding: 1.5rem;
    width: 280px;
    z-index: 999;
    animation: slideInRight 0.5s ease-out;
}

.service-float h3 {
    font-size: 1.25rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.service-float h3 i {
    font-size: 1.5rem;
}

.service-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.service-item i {
    font-size: 1.25rem;
    color: var(--primary-color);
    width: 24px;
    text-align: center;
}

.service-item p {
    margin: 0;
    color: var(--dark-color);
    font-size: 0.95rem;
}

.service-item strong {
    color: var(--primary-color);
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateY(-50%) translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateY(-50%) translateX(0);
    }
}

/* Responsive for service float */
@media (max-width: 768px) {
    .service-float {
        width: 240px;
        right: 10px;
        padding: 1rem;
    }
    
    .service-float h3 {
        font-size: 1.1rem;
    }
    
    .service-item p {
        font-size: 0.85rem;
    }
}