/* ===================================
   Air Purifier Australia - Styles
   Modern, Clean, SEO-Friendly Design
   =================================== */

/* CSS Variables */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --text-dark: #1f2937;
    --text-medium: #4b5563;
    --text-light: #6b7280;
    --bg-white: #ffffff;
    --bg-light: #f9fafb;
    --bg-gray: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

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

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

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

ul {
    list-style: none;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-buy {
    background: var(--accent-color);
    color: white;
    padding: 10px 20px;
    font-size: 0.95rem;
}

.btn-buy:hover {
    background: #d97706;
    color: white;
    transform: translateY(-2px);
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: 15px 0;
    box-shadow: var(--shadow-sm);
}

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

.logo a {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.logo-icon {
    font-size: 1.8rem;
}

.logo-text {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-dark);
}

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

.nav ul {
    display: flex;
    gap: 32px;
}

.nav a {
    color: var(--text-medium);
    font-weight: 500;
    padding: 8px 0;
    position: relative;
}

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

.nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav a:hover::after {
    width: 100%;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition);
}

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

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

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 50%, #bfdbfe 100%);
    padding: 80px 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-medium);
    max-width: 600px;
    margin: 0 auto 30px;
}

/* Trust Badges */
.trust-badges {
    padding: 40px 0;
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
}

.badges-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 40px;
}

.badge {
    display: flex;
    align-items: center;
    gap: 10px;
}

.badge-icon {
    font-size: 1.5rem;
}

.badge-text {
    font-weight: 600;
    color: var(--text-dark);
}

/* Section Styles */
section {
    padding: 80px 0;
}

section h2 {
    font-size: 2.2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.section-subtitle {
    text-align: center;
    color: var(--text-medium);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto 50px;
}

/* Products Section */
.products {
    background: var(--bg-light);
}

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

/* Product Card */
.product-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
}

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

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

.product-badge {
    position: absolute;
    top: 15px;
    left: 15px;
    background: var(--primary-color);
    color: white;
    padding: 6px 14px;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 20px;
    z-index: 2;
}

.product-badge.best-value {
    background: var(--secondary-color);
}

.product-badge.budget {
    background: var(--accent-color);
}

.product-image {
    width: 100%;
    height: 220px;
    background: var(--bg-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-content {
    padding: 25px;
}

.product-content h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.product-rating {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 15px;
}

.stars {
    color: var(--accent-color);
    font-size: 1rem;
}

.rating-text {
    font-size: 0.9rem;
    color: var(--text-light);
    font-weight: 500;
}

.product-features {
    margin-bottom: 15px;
}

.product-features li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: var(--text-medium);
}

.product-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

.product-specs {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: 15px 0;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-medium);
}

.product-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.product-price {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-dark);
}

/* Buying Guide */
.buying-guide {
    background: var(--bg-white);
}

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

.guide-card {
    background: var(--bg-light);
    padding: 30px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
}

.guide-card:hover {
    background: var(--bg-white);
    box-shadow: var(--shadow-lg);
}

.guide-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.guide-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.guide-card p {
    font-size: 0.95rem;
    color: var(--text-medium);
    line-height: 1.7;
}

/* Benefits Section */
.benefits {
    background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.benefit-card {
    background: var(--bg-white);
    padding: 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.benefit-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.benefit-card p {
    color: var(--text-medium);
    line-height: 1.7;
}

/* Comparison Table */
.comparison {
    background: var(--bg-white);
    padding: 80px 0;
}

.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-white);
}

.comparison-table th,
.comparison-table td {
    padding: 18px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.comparison-table th {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
    font-size: 0.95rem;
}

.comparison-table tr:hover {
    background: var(--bg-light);
}

.comparison-table td {
    font-size: 0.95rem;
    color: var(--text-medium);
}

.comparison-table td strong {
    color: var(--text-dark);
}

.btn-table {
    display: inline-block;
    padding: 8px 16px;
    background: var(--accent-color);
    color: white;
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-table:hover {
    background: #d97706;
    color: white;
    transform: translateY(-1px);
}

/* FAQ Section */
.faq {
    background: var(--bg-light);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
}

.faq-item {
    background: var(--bg-white);
    padding: 25px 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
}

.faq-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.faq-item p {
    color: var(--text-medium);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* SEO Content Section */
.seo-content {
    background: var(--bg-white);
    padding: 80px 0;
    border-top: 1px solid var(--border-color);
}

.seo-content h2 {
    text-align: left;
    margin-bottom: 30px;
}

.seo-text {
    max-width: 900px;
}

.seo-text p {
    margin-bottom: 20px;
    color: var(--text-medium);
    line-height: 1.8;
}

.seo-text h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin: 35px 0 15px;
    color: var(--text-dark);
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: #9ca3af;
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 40px;
}

.footer-brand .logo-icon {
    font-size: 1.5rem;
}

.footer-brand .logo-text {
    color: white;
}

.footer-brand p {
    margin-top: 15px;
    font-size: 0.95rem;
    line-height: 1.6;
}

.footer-links h4 {
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: #9ca3af;
    font-size: 0.95rem;
    transition: var(--transition);
}

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

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid #374151;
    text-align: center;
    font-size: 0.9rem;
}

.footer-bottom p {
    margin-bottom: 10px;
}

.affiliate-disclosure {
    font-size: 0.85rem;
    opacity: 0.8;
    max-width: 700px;
    margin: 0 auto;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .guide-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }

    .footer-brand {
        grid-column: span 2;
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-white);
        padding: 20px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-150%);
        opacity: 0;
        transition: var(--transition);
    }

    .nav.active {
        transform: translateY(0);
        opacity: 1;
    }

    .nav ul {
        flex-direction: column;
        gap: 15px;
    }

    .hero {
        padding: 60px 0;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    section {
        padding: 60px 0;
    }

    section h2 {
        font-size: 1.8rem;
    }

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

    .guide-grid {
        grid-template-columns: 1fr;
    }

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

    .faq-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
        text-align: center;
    }

    .footer-brand {
        grid-column: span 1;
    }

    .badges-grid {
        gap: 20px;
    }

    .badge {
        flex-direction: column;
        text-align: center;
        gap: 5px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero h1 {
        font-size: 1.7rem;
    }

    .product-content {
        padding: 20px;
    }

    .product-footer {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .btn-buy {
        width: 100%;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 12px 10px;
        font-size: 0.85rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* Focus states for accessibility */
a:focus,
button:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .header,
    .mobile-menu-btn,
    .btn-buy,
    .footer {
        display: none;
    }

    body {
        font-size: 12pt;
        color: black;
    }

    a {
        color: black;
        text-decoration: underline;
    }

    .product-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
}