/* CSS Reset & Variables */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #0f172a;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --transition: all 0.2s ease;
}

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

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-primary);
    background-color: var(--bg-primary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--secondary-color);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; margin-bottom: 0.5rem; }
h3 { font-size: 1.25rem; }

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 2.5rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: var(--transition);
    cursor: pointer;
    border: none;
    text-align: center;
}

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

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

.btn-product {
    background: linear-gradient(135deg, #ff9900 0%, #ff6600 100%);
    color: white;
    width: 100%;
    padding: 0.75rem 1rem;
}

.btn-product:hover {
    background: linear-gradient(135deg, #ff6600 0%, #cc5200 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Header */
.header {
    position: sticky;
    top: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 1rem 0;
}

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

.logo a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--secondary-color);
}

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

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

.nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
}

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--secondary-color);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    padding: 5rem 0;
}

.hero-content {
    max-width: 700px;
    text-align: center;
    margin: 0 auto;
}

.hero h1 {
    margin-bottom: 1.5rem;
    font-size: 3rem;
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Trust Badges */
.trust-badges {
    background: var(--bg-primary);
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.badges-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.badge-icon {
    font-size: 1.25rem;
}

/* Types Section */
.types-section {
    padding: 5rem 0;
    background: var(--bg-primary);
    text-align: center;
}

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

.type-card {
    background: var(--bg-secondary);
    padding: 2.5rem 2rem;
    border-radius: var(--radius-xl);
    text-align: left;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.type-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.type-card h3 {
    margin-bottom: 0.75rem;
    color: var(--secondary-color);
}

.type-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.type-card ul {
    list-style: none;
}

.type-card li {
    padding: 0.25rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

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

/* Products Section */
.products-section {
    padding: 5rem 0;
    background: var(--bg-secondary);
    text-align: center;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.product-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
}

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

.product-badge {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: var(--primary-color);
    color: white;
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    z-index: 1;
}

.product-badge.popular {
    background: var(--success-color);
}

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

.product-image {
    position: relative;
    padding-top: 75%;
    background: var(--bg-tertiary);
    overflow: hidden;
}

.product-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.product-image svg.product-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 70%;
    height: 70%;
    transition: var(--transition);
}

.product-card:hover .product-image img,
.product-card:hover .product-image svg.product-icon {
    transform: translate(-50%, -50%) scale(1.05);
}

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

.product-content {
    padding: 1.25rem;
    text-align: left;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.product-brand {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.product-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
    line-height: 1.4;
}

.product-rating {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.stars {
    color: #fbbf24;
    font-size: 0.875rem;
}

.rating-count {
    font-size: 0.75rem;
    color: var(--text-light);
}

.product-features {
    list-style: none;
    margin-bottom: 1rem;
    flex-grow: 1;
}

.product-features li {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    padding: 0.2rem 0;
    padding-left: 1.25rem;
    position: relative;
}

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

.product-price {
    margin-bottom: 1rem;
}

.price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary-color);
}

.price-note {
    font-size: 0.75rem;
    color: var(--text-light);
    display: block;
}

/* Buying Guide Section */
.guide-section {
    padding: 5rem 0;
    background: var(--bg-primary);
    text-align: center;
}

.guide-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.guide-card {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: left;
    border: 1px solid var(--border-color);
}

.guide-card h3 {
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

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

/* Brands Section */
.brands-section {
    padding: 5rem 0;
    background: var(--bg-secondary);
    text-align: center;
}

.brands-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.brand-card {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.brand-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.brand-name {
    display: block;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 0.25rem;
}

.brand-desc {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

/* SEO Section */
.seo-section {
    padding: 5rem 0;
    background: var(--bg-primary);
    text-align: center;
}

.seo-content {
    max-width: 800px;
    margin: 2rem auto 0;
    text-align: left;
}

.seo-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

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

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.125rem;
    margin-bottom: 1rem;
}

.footer-col p {
    color: var(--text-light);
    font-size: 0.875rem;
}

.footer-col h4 {
    color: white;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.footer-col li {
    margin-bottom: 0.5rem;
}

.footer-col a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 0.875rem;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
}

.footer-bottom p {
    color: var(--text-light);
    font-size: 0.8125rem;
    margin-bottom: 0.5rem;
}

.affiliate-disclosure {
    font-size: 0.75rem !important;
    color: var(--text-light);
    opacity: 0.8;
}

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

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }

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

    .hero {
        padding: 3rem 0;
    }

    .hero p {
        font-size: 1rem;
    }

    .nav {
        position: fixed;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        padding: 1rem;
        border-bottom: 1px solid var(--border-color);
        display: none;
        box-shadow: var(--shadow-lg);
    }

    .nav.active {
        display: block;
    }

    .nav ul {
        flex-direction: column;
        gap: 0;
    }

    .nav li {
        border-bottom: 1px solid var(--border-color);
    }

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

    .nav a {
        display: block;
        padding: 0.75rem 0;
    }

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

    .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(5px, -5px);
    }

    .badges-grid {
        gap: 1rem;
    }

    .badge {
        font-size: 0.75rem;
    }

    .types-section,
    .products-section,
    .guide-section,
    .brands-section,
    .seo-section {
        padding: 3rem 0;
    }

    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .footer-logo {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

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

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

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

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

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

    html {
        scroll-behavior: auto;
    }
}

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

/* Print styles */
@media print {
    .header,
    .hero,
    .trust-badges,
    .footer {
        display: none;
    }

    .product-card {
        break-inside: avoid;
    }
}