/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors - Apple inspired palette */
    --color-primary: #0071e3;    --color-primary-dark: #0051a2;
    --color-secondary: #1d1d1f;
    --color-text: #1d1d1f;
    --color-text-secondary: #86868b;
    --color-background: #ffffff;
    --color-surface: #f5f5f7;
    --color-border: #d2d2d7;
    --color-success: #34c759;
    --color-warning: #ff9500;
    --color-danger: #ff3b30;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 17px;
    --font-size-lg: 21px;
    --font-size-xl: 28px;
    --font-size-2xl: 40px;
    --font-size-3xl: 48px;
    --font-size-4xl: 64px;
    --font-size-5xl: 80px;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    --spacing-3xl: 96px;
    --spacing-4xl: 128px;
    
    /* Layout */
    --max-width: 1200px;
    --nav-height: 48px;
    
    /* Animations */
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.6, 1);
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.6, 1);
}

/* Base Typography */
body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.47059;
    font-weight: 400;
    letter-spacing: -0.022em;
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    opacity: 1 !important; /* 确保页面可见 */
}

html {
    scroll-behavior: smooth;
}

/* 确保内容可见的回退样式 */
body.loading {
    opacity: 1;
}

body.loaded {
    opacity: 1;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    letter-spacing: -0.024em;
    line-height: 1.1;
    margin: 0;
}

h1 {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    letter-spacing: -0.028em;
}

h2 {
    font-size: var(--font-size-3xl);
    font-weight: 600;
}

h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

p {
    line-height: 1.5;
    color: var(--color-text-secondary);
    margin: 0;
}

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

a:hover {
    text-decoration: underline;
}

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: var(--transition-base);
}

.nav.scrolled {
    background: rgba(255, 255, 255, 0.72);
}

.nav-wrapper {
    max-width: var(--max-width);
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
    position: relative;
}

.nav-logo {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
    z-index: 1001;
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
}

.nav-menu a {
    color: var(--color-text);
    font-size: var(--font-size-sm);
    font-weight: 400;
    text-decoration: none;
    transition: var(--transition-fast);
}

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

.nav-cta {
    background: var(--color-primary);
    color: white !important;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
}

.nav-cta:hover {
    background: var(--color-primary-dark);
    text-decoration: none !important;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.mobile-menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-text);
    transition: var(--transition-fast);
    transform-origin: center;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Hero Section */
.hero {
    padding-top: calc(var(--nav-height) + var(--spacing-3xl));
    padding-bottom: var(--spacing-3xl);
    min-height: calc(100vh - var(--nav-height));
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #ffffff 0%, #f5f5f7 100%);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
    min-height: 600px;
}

.hero-content {
    text-align: left;
}

.hero-headline {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(180deg, #1d1d1f 0%, #86868b 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subheadline {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    line-height: 1.4;
    margin-bottom: var(--spacing-xl);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-2xl);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    display: block;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 24px;
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-fast);
    cursor: pointer;
    border: none;
    outline: none;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: scale(1.02);
    text-decoration: none;
}

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

.btn-secondary:hover {
    background: var(--color-primary);
    color: white;
    text-decoration: none;
}

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

.btn-outline:hover {
    border-color: var(--color-text);
    text-decoration: none;
}

.btn-block {
    width: 100%;
}

/* Network Animation */
.hero-visual {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.network-animation {
    position: relative;
    width: 100%;
    max-width: 500px;
    height: 400px;
    background: var(--color-surface);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

#network-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* Technology Section */
.technology {
    padding: var(--spacing-3xl) 0;
    background: var(--color-surface);
}

.tech-comparison {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.comparison-card {
    background: white;
    border-radius: 20px;
    padding: var(--spacing-xl);
    position: relative;
    transition: var(--transition-base);
}

.comparison-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.card-header.success h3 {
    color: var(--color-success);
}

.card-header.warning h3 {
    color: var(--color-warning);
}

.badge {
    background: var(--color-surface);
    color: var(--color-text-secondary);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.diagram {
    height: 200px;
    background: var(--color-surface);
    border-radius: 12px;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.diagram img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

/* 为缺失的图片添加占位符样式 */
.diagram:empty::after,
.diagram img[src*="data:image/svg+xml;base64,..."]:after {
    content: "📊 Network Diagram";
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    width: 100%;
    height: 100%;
}

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

.feature-list li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    position: relative;
}

.feature-list li::before {
    position: absolute;
    left: 0;
    font-weight: 600;
}

.feature-list li.success::before {
    content: "✓";
    color: var(--color-success);
}

.feature-list li.warning::before {
    content: "✗";
    color: var(--color-warning);
}

.tech-applications {
    margin-top: var(--spacing-2xl);
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.app-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 16px;
    text-align: center;
    transition: var(--transition-base);
}

.app-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
}

.app-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-sm);
}

/* Infrastructure Section */
.infrastructure {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
}

.infrastructure-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.infra-card {
    background: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: 20px;
    text-align: center;
    transition: var(--transition-base);
}

.infra-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
}

.infra-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    color: var(--color-primary);
}

.infra-card h3 {
    margin-bottom: var(--spacing-sm);
}

.metric {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.metric-value {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
    display: block;
}

.metric-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* Network Section */
.network {
    padding: var(--spacing-3xl) 0;
    background: var(--color-surface);
}

.network-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.network-info h2 {
    margin-bottom: var(--spacing-md);
}

.network-description {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
}

.network-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.network-features {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 16px;
}

.network-features h3 {
    margin-bottom: var(--spacing-sm);
}

.network-features ul {
    list-style: none;
}

.network-features li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    position: relative;
}

.network-features li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

.network-map {
    position: relative;
    height: 500px;
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
}

#china-map {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
}

/* Solutions Section */
.solutions {
    padding: var(--spacing-3xl) 0;
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.solution-card {
    background: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: 20px;
    position: relative;
    transition: var(--transition-base);
    display: flex;
    flex-direction: column;
}

.solution-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
}

.solution-card.featured {
    border: 2px solid var(--color-primary);
    background: white;
}

.featured-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: white;
    padding: 4px 16px;
    border-radius: 12px;
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.solution-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-sm);
}

.solution-card h3 {
    margin-bottom: var(--spacing-sm);
}

.solution-features {
    list-style: none;
    margin: var(--spacing-md) 0;
    flex-grow: 1;
}

.solution-features li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    position: relative;
    color: var(--color-text-secondary);
}

.solution-features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: 600;
}

.solution-card .btn {
    margin-top: auto;
    width: 100%;
}

/* Pricing Section */
.pricing {
    padding: var(--spacing-3xl) 0;
    background: var(--color-surface);
}

.pricing-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.pricing-header h2 {
    margin-bottom: var(--spacing-sm);
}

.pricing-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-2xl);
}

.toggle {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 28px;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-border);
    transition: var(--transition-fast);
    border-radius: 28px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: var(--transition-fast);
    border-radius: 50%;
}

.toggle input:checked + .toggle-slider {
    background-color: var(--color-primary);
}

.toggle input:checked + .toggle-slider:before {
    transform: translateX(20px);
}

.discount {
    color: var(--color-success);
    font-weight: 600;
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1100px;
    margin: 0 auto;
}

.pricing-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    padding: var(--spacing-xl);
    text-align: center;
    position: relative;
    transition: var(--transition-base);
    display: flex;
    flex-direction: column;
}

.pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
}

.pricing-card.featured {
    border-color: var(--color-primary);
    transform: scale(1.05);
}

.pricing-card h3 {
    margin-bottom: var(--spacing-md);
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
}

.currency {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-right: 4px;
}

.amount {
    font-size: var(--font-size-3xl);
    font-weight: 700;
}

.period {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-left: 4px;
}

.custom {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
}

.pricing-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--spacing-lg);
    flex-grow: 1;
}

.pricing-features li {
    padding: var(--spacing-xs) 0;
    color: var(--color-text-secondary);
    position: relative;
    padding-left: var(--spacing-md);
}

.pricing-features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: 600;
}

.pricing-card .btn {
    margin-top: auto;
    width: 100%;
}

/* Contact Section */
.contact {
    padding: var(--spacing-3xl) 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    max-width: 1100px;
    margin: 0 auto;
}

.contact-info h2 {
    margin-bottom: var(--spacing-md);
}

.contact-info p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
}

.contact-benefits {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.benefit {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.benefit svg {
    color: var(--color-success);
}

.contact-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: 16px;
}

.stat-item h4 {
    font-size: var(--font-size-2xl);
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.stat-item p {
    font-size: var(--font-size-sm);
}

/* Form */
.contact-form {
    background: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: 20px;
}

.contact-form h3 {
    margin-bottom: var(--spacing-lg);
}

.form-group {
    position: relative;
    margin-bottom: var(--spacing-md);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    padding-top: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: var(--transition-fast);
    background: white;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-group label {
    position: absolute;
    left: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    pointer-events: none;
    transition: var(--transition-fast);
    background: white;
    padding: 0 4px;
}

.form-group input:focus + label,
.form-group input:not(:placeholder-shown) + label,
.form-group textarea:focus + label,
.form-group textarea:not(:placeholder-shown) + label {
    top: 0;
    font-size: var(--font-size-sm);
    color: var(--color-primary);
}

.form-group textarea + label {
    top: 24px;
    transform: none;
}

.form-checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.form-checkbox input {
    width: auto;
}

.form-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-align: center;
    margin-top: var(--spacing-sm);
}

/* Form Validation Styles */
.form-group input.error,
.form-group select.error,
.form-group textarea.error {
    border-color: var(--color-danger);
    box-shadow: 0 0 0 3px rgba(255, 59, 48, 0.1);
}

.error-message {
    color: var(--color-danger);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: 4px;
}

.error-message::before {
    content: "⚠";
    font-size: 14px;
}

/* Success Modal */
.success-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.modal-content {
    position: relative;
    background: white;
    border-radius: 24px;
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 100%;
    text-align: center;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.success-icon {
    width: 64px;
    height: 64px;
    background: var(--color-success);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: bold;
    margin: 0 auto var(--spacing-md);
}

.modal-content h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.modal-content p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.success-details {
    background: var(--color-surface);
    border-radius: 12px;
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    text-align: left;
}

.success-details p {
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
    font-size: var(--font-size-sm);
}

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

/* Loading States */
.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.btn:disabled:hover {
    transform: none !important;
}

/* Smooth Page Loading */
body {
    opacity: 1;
    transition: none; /* 移除可能导致页面隐藏的过渡 */
}

/* Focus Improvements */
*:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.btn:focus {
    outline-offset: 4px;
}

/* Performance Optimizations */
* {
    will-change: auto;
}

.hero-visual,
.network-animation,
#network-canvas {
    will-change: transform;
}

/* Responsive Design - Mobile First */
@media screen and (max-width: 1024px) {
    .hero-grid,
    .network-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .hero-visual {
        order: -1;
    }
    
    .network-animation {
        max-width: 400px;
        height: 300px;
    }
    
    .network-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media screen and (max-width: 768px) {
    /* Navigation - Mobile */
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: white;
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-xl);
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 999;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-menu li {
        width: 100%;
        margin-bottom: var(--spacing-sm);
    }
    
    .nav-menu a {
        display: block;
        width: 100%;
        padding: var(--spacing-sm) 0;
        font-size: var(--font-size-lg);
        border-bottom: 1px solid var(--color-border);
    }
    
    .nav-cta {
        background: var(--color-primary) !important;
        color: white !important;
        border-radius: 24px !important;
        padding: var(--spacing-sm) var(--spacing-lg) !important;
        text-align: center;
        border: none !important;
    }
    
    /* Typography */
    .hero-headline {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subheadline {
        font-size: var(--font-size-lg);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    /* Spacing */
    .hero,
    .technology,
    .infrastructure,
    .network,
    .solutions,
    .pricing,
    .contact {
        padding: var(--spacing-2xl) 0;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        text-align: left;
    }
    
    .network-stats {
        grid-template-columns: 1fr;
    }
    
    /* Cards */
    .infrastructure-grid,
    .solutions-grid,
    .pricing-cards {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .tech-comparison {
        grid-template-columns: 1fr;
    }
    
    .app-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Forms */
    .hero-actions {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .btn {
        width: 100%;
    }
    
    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        text-align: center;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media screen and (max-width: 480px) {
    /* Extra small screens */
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-headline {
        font-size: var(--font-size-2xl);
    }
    
    .app-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .network-animation {
        max-width: 300px;
        height: 250px;
    }
    
    /* Compact pricing cards */
    .pricing-card {
        padding: var(--spacing-lg);
    }
    
    .price {
        flex-direction: column;
        align-items: center;
    }
}

@media screen and (max-width: 320px) {
    /* Very small screens */
    .hero-headline {
        font-size: var(--font-size-xl);
    }
    
    .nav-wrapper {
        padding: 0 var(--spacing-sm);
    }
    
    .pricing-cards {
        gap: var(--spacing-sm);
    }
}

/* Landscape mobile devices */
@media screen and (max-height: 600px) and (orientation: landscape) {
    .hero {
        min-height: 80vh;
        padding-top: calc(var(--nav-height) + var(--spacing-xl));
        padding-bottom: var(--spacing-xl);
    }
    
    .hero-grid {
        min-height: auto;
    }
    
    .network-animation {
        height: 200px;
    }
}

/* Footer Styles */
.footer {
    background: var(--color-secondary);
    color: #ffffff;
    padding: var(--spacing-4xl) 0 var(--spacing-xl);
    margin-top: var(--spacing-4xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-3xl);
}

.footer-brand {
    max-width: 400px;
}

.footer-brand h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: #ffffff;
}

.footer-description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
}

.footer-column h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: #ffffff;
}

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

.footer-column ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-column ul li a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color 0.3s ease;
}

.footer-column ul li a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-bottom p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.footer-bottom a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* High DPI displays */
@media screen and (-webkit-min-device-pixel-ratio: 2),
       screen and (min-resolution: 192dpi) {
    /* Ensure crisp rendering on high DPI displays */
    body {
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
}