/* ==========================================================================
   USBC.AU - Modern Responsive Styles
   ========================================================================== */

/* CSS Variables for Theming */
:root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary-color: #7c3aed;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-alt: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

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

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

ul, ol {
    margin-bottom: var(--spacing-sm);
}

img {
    max-width: 100%;
    height: auto;
}

/* ==========================================================================
   Layout & Container
   ========================================================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.content-section {
    padding: var(--spacing-2xl) 0;
}

.alt-bg {
    background-color: var(--bg-secondary);
}

/* ==========================================================================
   Navigation
   ========================================================================== */

#main-nav {
    background-color: var(--bg-primary);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all var(--transition-base);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 70px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    text-decoration: none;
}

.logo span {
    color: var(--accent-color);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    margin: 0;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background-color: var(--bg-alt);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    margin: 3px 0;
    transition: all var(--transition-base);
    border-radius: 2px;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: var(--spacing-2xl) 0;
    min-height: 600px;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    flex: 1;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    color: white;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.95);
    max-width: 600px;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.btn {
    padding: 0.875rem 2rem;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-base);
    border: 2px solid transparent;
    text-align: center;
    display: inline-block;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

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

/* USB-C Connector Animation */
.hero-visual {
    display: none;
}

.usbc-connector-animation {
    width: 200px;
    height: 100px;
    position: relative;
}

.connector-plug,
.connector-port {
    position: absolute;
    background: linear-gradient(180deg, #e0e0e0 0%, #b0b0b0 100%);
    border-radius: var(--radius-sm);
}

.connector-plug {
    width: 50px;
    height: 20px;
    top: 40px;
    left: 0;
    animation: plugAnimation 3s infinite;
}

.connector-port {
    width: 60px;
    height: 25px;
    top: 37.5px;
    right: 0;
}

@keyframes plugAnimation {
    0%, 100% { left: 0; }
    50% { left: 140px; }
}

/* ==========================================================================
   Feature Grid
   ========================================================================== */

.section-intro {
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    text-align: center;
    font-size: 1.125rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.feature-card {
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

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

/* ==========================================================================
   Interactive Speed Comparison
   ========================================================================== */

.interactive-demo {
    background-color: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-top: var(--spacing-xl);
}

.speed-comparison {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.comparison-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.comparison-item h4 {
    font-size: 1rem;
    font-weight: 600;
    min-width: 100px;
}

.speed-bar {
    background-color: var(--bg-alt);
    height: 40px;
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
}

.speed-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    transition: width var(--transition-slow);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 0 var(--spacing-sm);
    border-radius: var(--radius-md);
}

.comparison-item.highlight .speed-fill {
    background: linear-gradient(90deg, var(--accent-color), #fbbf24);
}

.speed-value {
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

/* ==========================================================================
   Benefits Section
   ========================================================================== */

.benefits-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.benefit-block h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 3px solid var(--accent-color);
}

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

.benefits-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--text-secondary);
}

.benefits-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
    font-size: 1.25rem;
}

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

/* ==========================================================================
   Interactive Calculator
   ========================================================================== */

.interactive-calculator {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    color: white;
    margin-top: var(--spacing-xl);
}

.interactive-calculator h3 {
    color: white;
}

.interactive-calculator p {
    color: rgba(255, 255, 255, 0.9);
}

.calculator-controls {
    margin: var(--spacing-lg) 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.calculator-controls label {
    font-weight: 600;
}

.calculator-controls input[type="range"] {
    flex: 1;
    min-width: 200px;
}

#battery-display {
    background-color: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 600;
}

.charging-results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.charging-result {
    background-color: rgba(255, 255, 255, 0.15);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
}

.charging-result.highlight {
    background-color: rgba(255, 255, 255, 0.25);
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.charging-result h4 {
    color: white;
    margin-bottom: var(--spacing-sm);
}

.charge-time {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
}

/* ==========================================================================
   Tabs Component
   ========================================================================== */

.compatibility-tabs {
    margin-top: var(--spacing-xl);
}

.tab-buttons {
    display: flex;
    gap: var(--spacing-sm);
    border-bottom: 2px solid var(--border-color);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.tab-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: none;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all var(--transition-fast);
    position: relative;
    margin-bottom: -2px;
}

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

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

.tab-content {
    display: none;
    animation: fadeIn var(--transition-base);
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.tab-content h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.tab-content ul {
    list-style: none;
    padding-left: 0;
}

.tab-content li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--text-secondary);
}

.tab-content li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.compatibility-note {
    background-color: var(--bg-alt);
    padding: var(--spacing-md);
    border-left: 4px solid var(--accent-color);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
}

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

/* ==========================================================================
   Cable Types
   ========================================================================== */

.cable-types {
    margin-top: var(--spacing-2xl);
}

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

.cable-card {
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 2px solid var(--border-color);
    transition: all var(--transition-base);
}

.cable-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.cable-card.highlight {
    border-color: var(--accent-color);
    background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
}

.cable-card h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.cable-card ul {
    list-style: none;
    padding-left: 0;
}

.cable-card li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
}

/* ==========================================================================
   Buying Guide Checklist
   ========================================================================== */

.buying-checklist {
    margin-top: var(--spacing-xl);
}

.checklist-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.checklist-item {
    background-color: var(--bg-primary);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-color);
    transition: all var(--transition-base);
}

.checklist-item:has(.checklist-checkbox:checked) {
    background-color: #ecfdf5;
    border-color: var(--success-color);
}

.checklist-checkbox {
    margin-right: var(--spacing-sm);
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.checklist-item label {
    cursor: pointer;
    display: block;
}

.checklist-item h4 {
    display: inline;
    margin-left: var(--spacing-xs);
}

.checklist-item p {
    margin-top: var(--spacing-sm);
    margin-left: 28px;
    font-size: 0.9rem;
}

/* ==========================================================================
   Price Table
   ========================================================================== */

.price-guidance {
    margin-top: var(--spacing-2xl);
}

.price-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-lg);
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.price-table thead {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
}

.price-table th,
.price-table td {
    padding: var(--spacing-md);
    text-align: left;
}

.price-table tbody tr {
    border-bottom: 1px solid var(--border-color);
}

.price-table tbody tr:hover {
    background-color: var(--bg-alt);
}

.price-table tbody tr:last-child {
    border-bottom: none;
}

.price-note {
    margin-top: var(--spacing-md);
    font-size: 0.9rem;
    color: var(--text-light);
}

/* ==========================================================================
   Retailer Grid
   ========================================================================== */

.where-to-buy {
    margin-top: var(--spacing-2xl);
}

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

.retailer-card {
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.retailer-card h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--accent-color);
}

.retailer-card ul {
    list-style: none;
    padding-left: 0;
}

.retailer-card li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
}

/* ==========================================================================
   Warning Box
   ========================================================================== */

.warning-box {
    background-color: #fef2f2;
    border-left: 4px solid #ef4444;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-xl);
}

.warning-box h3 {
    color: #dc2626;
    margin-bottom: var(--spacing-md);
}

.warning-box ul {
    list-style: none;
    padding-left: 0;
}

.warning-box li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-lg);
    position: relative;
}

.warning-box li::before {
    content: '⚠';
    position: absolute;
    left: 0;
    color: #dc2626;
}

/* ==========================================================================
   Accordion
   ========================================================================== */

.troubleshooting-accordion {
    margin-top: var(--spacing-xl);
}

.accordion-item {
    background-color: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
}

.accordion-header {
    width: 100%;
    padding: var(--spacing-lg);
    background: none;
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    text-align: left;
    transition: background-color var(--transition-fast);
}

.accordion-header:hover {
    background-color: var(--bg-alt);
}

.accordion-header h3 {
    margin: 0;
    color: var(--text-primary);
}

.accordion-icon {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    transition: transform var(--transition-base);
}

.accordion-header[aria-expanded="true"] .accordion-icon {
    transform: rotate(45deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
    padding: 0 var(--spacing-lg);
}

.accordion-content.active {
    max-height: 1000px;
    padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.accordion-content h4 {
    color: var(--primary-color);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.accordion-content ul {
    list-style: none;
    padding-left: 0;
}

.accordion-content li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-lg);
    position: relative;
}

.accordion-content li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* ==========================================================================
   Safety Tips
   ========================================================================== */

.safety-tips {
    margin-top: var(--spacing-2xl);
}

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

.tip-card {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 2px solid #0ea5e9;
}

.tip-card h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

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

/* ==========================================================================
   Future Section
   ========================================================================== */

.future-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.future-card {
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    position: relative;
    border: 2px solid var(--border-color);
    transition: all var(--transition-base);
}

.future-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.future-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: linear-gradient(135deg, var(--accent-color), #fbbf24);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.future-card h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.future-card ul {
    list-style: none;
    padding-left: 0;
}

.future-card li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-lg);
    position: relative;
}

.future-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* ==========================================================================
   Timeline
   ========================================================================== */

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

.timeline-container {
    position: relative;
    padding: var(--spacing-lg) 0;
}

.timeline-container::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--primary-color), var(--accent-color));
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-year {
    flex: 1;
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.timeline-year::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    background-color: var(--primary-color);
    border: 4px solid var(--bg-primary);
    border-radius: 50%;
    box-shadow: var(--shadow-md);
}

.timeline-item:nth-child(odd) .timeline-year::after {
    right: -8px;
}

.timeline-item:nth-child(even) .timeline-year::after {
    left: -8px;
}

.timeline-content {
    flex: 1;
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 2px solid var(--border-color);
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-right: var(--spacing-lg);
}

.timeline-item:nth-child(even) .timeline-content {
    margin-left: var(--spacing-lg);
}

.timeline-content h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.timeline-content p {
    margin: 0;
}

/* ==========================================================================
   Expert Insight
   ========================================================================== */

.expert-insight {
    background-color: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    margin-top: var(--spacing-2xl);
    border-left: 5px solid var(--primary-color);
}

.expert-insight blockquote {
    font-size: 1.125rem;
    font-style: italic;
    color: var(--text-secondary);
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-lg);
    border-left: 3px solid var(--accent-color);
}

.recommendation {
    background-color: var(--bg-alt);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */

.faq-container {
    max-width: 900px;
    margin: 0 auto;
    margin-top: var(--spacing-xl);
}

.faq-item {
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-md);
    border: 2px solid var(--border-color);
    transition: all var(--transition-base);
}

.faq-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.faq-item h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.faq-item p {
    margin: 0;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
    background-color: var(--text-primary);
    color: var(--text-light);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

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

.footer-section h3,
.footer-section h4 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    color: var(--text-light);
    font-size: 0.9rem;
}

.footer-links {
    list-style: none;
    padding: 0;
}

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

.footer-links a {
    color: var(--text-light);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: white;
}

.disclaimer {
    margin-top: var(--spacing-md);
    font-size: 0.85rem;
    opacity: 0.8;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-md);
    text-align: center;
    font-size: 0.9rem;
}

.footer-bottom p {
    margin-bottom: var(--spacing-xs);
}

/* ==========================================================================
   Back to Top Button
   ========================================================================== */

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

@media (max-width: 1024px) {
    .timeline-container::before {
        left: 30px;
    }

    .timeline-item,
    .timeline-item:nth-child(even) {
        flex-direction: row !important;
    }

    .timeline-year {
        flex: 0 0 60px;
    }

    .timeline-year::after {
        left: 22px !important;
        right: auto !important;
    }

    .timeline-content {
        flex: 1;
        margin-left: var(--spacing-lg) !important;
        margin-right: 0 !important;
    }
}

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.25rem; }

    .hero-content h1 {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background-color: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
    }

    .nav-links.active {
        display: flex;
    }

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

    .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, -7px);
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .price-table {
        font-size: 0.875rem;
    }

    .price-table th,
    .price-table td {
        padding: var(--spacing-sm);
    }

    .tab-buttons {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .tab-btn {
        white-space: nowrap;
    }

    .calculator-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .calculator-controls input[type="range"] {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .content-section {
        padding: var(--spacing-xl) 0;
    }

    .hero-content h1 {
        font-size: 1.875rem;
    }

    .feature-grid,
    .cable-grid,
    .retailer-grid,
    .tips-grid,
    .future-grid {
        grid-template-columns: 1fr;
    }

    .back-to-top {
        width: 45px;
        height: 45px;
        bottom: 20px;
        right: 20px;
    }
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
    .nav-container,
    .hero-section,
    .back-to-top,
    .mobile-menu-toggle {
        display: none;
    }

    body {
        font-size: 12pt;
        line-height: 1.5;
        color: #000;
    }

    .content-section {
        page-break-inside: avoid;
    }

    a {
        text-decoration: underline;
        color: #000;
    }

    a[href^="http"]:after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
    }
}

/* ==========================================================================
   Accessibility Enhancements
   ========================================================================== */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 3px solid var(--accent-color);
    outline-offset: 2px;
}

/* Reduced motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}