:root {
    --primary: #2563eb;
    --primary-light: #3b82f6;
    --primary-dark: #1d4ed8;
    --secondary: #0ea5e9;
    --accent: #f59e0b;
    --success: #10b981;
    --surface: #ffffff;
    --surface-gray: #f8fafc;
    --surface-gray-light: #f1f5f9;
    --border: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.04);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: all 0.25s ease;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --section-padding: 80px 0;
    --section-padding-tablet: 60px 0;
    --section-padding-mobile: 48px 0;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    line-height: 1.6;
    background-color: var(--surface);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 16px;
    color: var(--text-primary);
}

p {
    color: var(--text-secondary);
    margin-bottom: 16px;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-primary:hover {
    background-color: white;
    color: var(--primary);
    border: 1px solid var(--primary);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary);
    border: 1px solid var(--border);
}

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

.btn-outline {
    background-color: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}

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

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

.text-primary {
    color: var(--primary);
}

.text-secondary {
    color: var(--text-secondary);
}

.text-muted {
    color: var(--text-muted);
}

header {
    background-color: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 16px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-icon {
    width: 36px;
    height: 36px;
    background-color: var(--primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
}

nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

nav a {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 1px;
}

.hero {
    padding: 80px 0;
    background-color: var(--surface-gray);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.hero h1 {
    font-size: 36px;
    margin-bottom: 24px;
}

.hero p {
    font-size: 16px;
    margin-bottom: 32px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.page-banner {
    padding: 0;
    background-color: var(--surface-gray);
    min-height: 400px;
    display: flex;
    align-items: center;
}

.page-banner-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    width: 100%;
}

.page-banner-left {
    display: flex;
    flex-direction: column;
}

.page-banner-icon {
    width: 80px;
    height: 80px;
    background-color: var(--surface);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 28px;
    font-size: 36px;
    color: var(--primary);
    box-shadow: var(--shadow-md);
}

.page-banner h1 {
    font-size: 36px;
    margin-bottom: 20px;
    line-height: 1.3;
}

.page-banner p {
    font-size: 16px;
    max-width: none;
    margin-bottom: 28px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.page-banner-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.page-banner-right {
    display: flex;
    align-items: center;
    justify-content: center;
}

.page-banner-visual {
    background-color: var(--surface);
    border-radius: var(--radius-xl);
    padding: 48px;
    text-align: center;
    box-shadow: var(--shadow-md);
    width: 320px;
    height: 280px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.page-banner-visual i {
    font-size: 64px;
    color: var(--primary);
    margin-bottom: 20px;
}

.page-banner-visual h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.page-banner-visual p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 0;
}

.stats-section {
    background-color: var(--surface);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.stat-card {
    background-color: var(--surface-gray);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

section {
    padding: var(--section-padding);
}

.section-gray {
    background-color: var(--surface-gray);
}

.section-title {
    text-align: center;
    margin-bottom: 64px;
}

.section-title h2 {
    font-size: 28px;
    margin-bottom: 16px;
}

.section-title p {
    font-size: 16px;
    max-width: 600px;
    margin: 0 auto;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.product-card {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    transition: var(--transition);
}

.product-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.product-card .icon {
    width: 48px;
    height: 48px;
    background-color: var(--surface-gray);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 22px;
    color: var(--primary);
}

.product-card h3 {
    font-size: 18px;
    margin-bottom: 12px;
}

.product-card p {
    font-size: 14px;
    margin-bottom: 16px;
    line-height: 1.6;
}

.product-card .price {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary);
}

.partners-section {}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-bottom: 48px;
}

.partner-card {
    background-color: var(--surface);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    border: 1px solid var(--border);
}

.partner-card .icon {
    width: 64px;
    height: 64px;
    background-color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 28px;
    color: white;
}

.partner-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.partner-card p {
    font-size: 14px;
}

.steps-section {}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 48px;
}

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

.step-number {
    width: 48px;
    height: 48px;
    background-color: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-weight: 700;
}

.step-item h3 {
    font-size: 16px;
    margin-bottom: 12px;
}

.step-item p {
    font-size: 14px;
    line-height: 1.6;
}

.cta-section {
    background-color: var(--surface);
}

.cta-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.cta-content h2 {
    font-size: 28px;
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 16px;
    margin-bottom: 32px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.cta-card {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    min-width: 220px;
}

.cta-card .letter {
    width: 48px;
    height: 48px;
    background-color: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 24px;
    font-weight: 700;
}

.cta-card h3 {
    font-size: 16px;
    margin-bottom: 8px;
}

.cta-card p {
    font-size: 13px;
    margin-bottom: 16px;
}

footer {
    background-color: var(--surface);
    border-top: 1px solid var(--border);
    padding: 48px 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 32px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-brand-icon {
    width: 36px;
    height: 36px;
    background-color: var(--primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
}

.footer-about p {
    font-size: 14px;
    line-height: 1.6;
}

.footer-links h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 8px;
}

.footer-links a {
    font-size: 14px;
    color: var(--text-secondary);
}

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

.contact-info li {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

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

.copyright {
    border-top: 1px solid var(--border);
    padding-top: 24px;
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
}

.product-detail {
    padding: 60px 0;
}

.product-detail-header {
    text-align: center;
    margin-bottom: 48px;
}

.product-detail-header h1 {
    font-size: 32px;
    margin-bottom: 16px;
}

.product-detail-header p {
    font-size: 16px;
    max-width: 600px;
    margin: 0 auto;
}

.product-variants {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 64px;
}

.variant-card {
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: var(--transition);
}

.variant-card:hover {
    border-color: var(--primary);
}

.variant-card.featured {
    border-color: var(--primary);
    background-color: rgba(37, 99, 235, 0.02);
}

.variant-card h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

.variant-card .variant-desc {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.variant-card .price {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 24px;
}

.variant-card .price span {
    font-size: 14px;
    font-weight: 400;
    color: var(--text-muted);
}

.variant-card ul {
    list-style: none;
    text-align: left;
    margin-bottom: 24px;
}

.variant-card li {
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
    color: var(--text-secondary);
}

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

.variant-card li::before {
    content: '✓';
    color: var(--success);
    margin-right: 8px;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 48px;
}

.comparison-table th,
.comparison-table td {
    padding: 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.comparison-table th {
    font-weight: 600;
    font-size: 14px;
}

.comparison-table td {
    font-size: 14px;
    color: var(--text-secondary);
}

.comparison-table .checkmark {
    color: var(--success);
}

.comparison-table .crossmark {
    color: var(--text-muted);
}

.partners-page {
    padding: 60px 0;
}

.partners-page h1 {
    font-size: 32px;
    margin-bottom: 16px;
}

.partners-page h2 {
    font-size: 24px;
    margin-bottom: 16px;
    margin-top: 48px;
}

.partners-page p {
    font-size: 16px;
    margin-bottom: 16px;
}

.partners-page ul {
    margin-left: 24px;
    margin-bottom: 16px;
}

.partners-page li {
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.benefit-card {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.benefit-card h3 {
    font-size: 16px;
    margin-bottom: 8px;
}

.benefit-card p {
    font-size: 14px;
}

.contact-section {
    padding: 80px 0;
    background-color: var(--surface-gray);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 48px;
}

.contact-info-section h3 {
    font-size: 20px;
    margin-bottom: 24px;
}

.contact-info-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 32px;
}

.contact-info-list li {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 12px;
}

.contact-info-list .icon {
    width: 56px;
    height: 56px;
    background-color: var(--primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
}

.contact-info-list h4 {
    font-size: 14px;
    font-weight: 600;
    margin: 0;
}

.contact-info-list p {
    margin: 4px 0;
    font-size: 14px;
    color: var(--text-secondary);
}

.wechat-qrcode {
    margin-top: 8px;
}

.wechat-qrcode img {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
}



@media (max-width: 1024px) {
    section {
        padding: var(--section-padding-tablet);
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 48px;
        text-align: center;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .contact-info-list {
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }

    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .steps-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

    .product-variants {
        grid-template-columns: 1fr;
        gap: 20px;
    }

}

@media (max-width: 768px) {
    section {
        padding: var(--section-padding-mobile);
    }

    nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--surface);
        border-bottom: 1px solid var(--border);
        padding: 24px;
        flex-direction: column;
        gap: 16px;
    }

    nav.active {
        display: flex;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .header-actions .btn span {
        display: none;
    }

    .header-actions .btn {
        padding: 8px;
        width: 40px;
        height: 40px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .hero {
        padding: 60px 0 80px;
    }

    .hero h1 {
        font-size: 28px;
    }

    .page-banner {
        min-height: auto;
        padding: 48px 0;
    }

    .contact-info-list {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .page-banner-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .page-banner-icon {
        width: 64px;
        height: 64px;
        font-size: 28px;
        margin: 0 auto 20px;
    }

    .page-banner h1 {
        font-size: 28px;
    }

    .page-banner-buttons {
        justify-content: center;
    }

    .page-banner-visual {
        padding: 32px;
        width: 100%;
        max-width: 280px;
        height: auto;
    }

    .page-banner-visual i {
        font-size: 48px;
    }

    .hero-buttons {
        justify-content: center;
    }

    .products-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .partners-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .steps-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .benefits-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .cta-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .install-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .clients-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
}

.qrcode-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.qrcode-modal.active {
    display: flex;
}

.qrcode-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.qrcode-modal-content {
    position: relative;
    background-color: white;
    border-radius: var(--radius-xl);
    padding: 32px;
    max-width: 360px;
    width: 90%;
    text-align: center;
    box-shadow: var(--shadow-xl);
    animation: modalFadeIn 0.3s ease;
}

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

.qrcode-modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 32px;
    height: 32px;
    border: none;
    background-color: var(--surface-gray);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 14px;
}

.qrcode-modal-close:hover {
    background-color: var(--border);
}

.qrcode-modal-body h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

.qrcode-modal-body p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 24px;
}

.qrcode-image {
    margin-bottom: 16px;
}

.qrcode-image img {
    width: 200px;
    height: 200px;
    border-radius: var(--radius-md);
}

.qrcode-hint {
    color: var(--text-secondary);
    font-size: 14px;
}

.cta-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.install-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.clients-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

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

.mt-12 {
    margin-top: 48px;
}

.mb-16 {
    margin-bottom: 64px;
}

.btn-block {
    width: 100%;
}

.card-link {
    display: inline-block;
    margin-top: 12px;
    font-size: 14px;
    font-weight: 600;
}