/* CSS Variables */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary: #0f172a;
    --accent: #06b6d4;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --white: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --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: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --transition: all 0.2s 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(--gray-700);
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--gray-900);
    font-weight: 700;
    line-height: 1.3;
}

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

@media (min-width: 768px) {
    h1 { font-size: 3.5rem; }
    h2 { font-size: 2.5rem; }
}

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

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

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

.btn-secondary {
    background: var(--white);
    color: var(--gray-700);
    border: 2px solid var(--gray-200);
}

.btn-secondary:hover {
    background: var(--gray-50);
    border-color: var(--gray-300);
    color: var(--gray-900);
}

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

.btn-success:hover {
    background: #059669;
    color: var(--white);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-100);
    z-index: 1000;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--gray-900);
}

.logo:hover {
    color: var(--gray-900);
}

.logo-icon {
    font-size: 1.75rem;
}

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

.logo-suffix {
    color: var(--gray-500);
    font-weight: 500;
    font-size: 1rem;
}

.nav {
    display: none;
    gap: 2rem;
}

@media (min-width: 768px) {
    .nav {
        display: flex;
    }
}

.nav-link {
    color: var(--gray-600);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

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

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

.nav-link:hover::after {
    width: 100%;
}

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

@media (min-width: 768px) {
    .mobile-menu-btn {
        display: none;
    }
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    transition: var(--transition);
}

.mobile-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--white);
    padding: 2rem;
    transform: translateX(100%);
    transition: var(--transition);
    z-index: 999;
}

.mobile-menu.active {
    transform: translateX(0);
}

.mobile-nav {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.mobile-nav-link {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-700);
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--gray-100);
}

/* Hero Section */
.hero {
    padding: 8rem 0 5rem;
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
}

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

.hero h1 {
    margin-bottom: 1.5rem;
}

.highlight {
    color: var(--primary);
    position: relative;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 3rem;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-200);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--gray-900);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-500);
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header p {
    color: var(--gray-500);
    font-size: 1.125rem;
    margin-top: 0.75rem;
}

/* Products Section */
.products-section {
    padding: 5rem 0;
}

.category-tabs {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 2.5rem;
}

.tab-btn {
    padding: 0.625rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-600);
    background: var(--gray-100);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover {
    background: var(--gray-200);
    color: var(--gray-900);
}

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

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

/* Product Card */
.product-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-200);
    overflow: hidden;
    transition: var(--transition);
}

.product-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.product-image {
    position: relative;
    aspect-ratio: 4/3;
    background: var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    overflow: hidden;
}

.product-badge {
    position: absolute;
    top: 1rem;
    left: 1rem;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius);
    text-transform: uppercase;
}

.badge-bestseller {
    background: var(--warning);
    color: var(--gray-900);
}

.badge-new {
    background: var(--success);
    color: var(--white);
}

.badge-sale {
    background: var(--danger);
    color: var(--white);
}

.compare-checkbox {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.625rem;
    background: var(--white);
    border-radius: var(--radius);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--gray-600);
    cursor: pointer;
    opacity: 0;
    transition: var(--transition);
}

.product-card:hover .compare-checkbox {
    opacity: 1;
}

.compare-checkbox input {
    width: 1rem;
    height: 1rem;
    accent-color: var(--primary);
}

.product-info {
    padding: 1.25rem;
}

.product-category {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.product-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.product-specs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.spec-tag {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    background: var(--gray-100);
    color: var(--gray-600);
    border-radius: var(--radius-sm);
}

.product-rating {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.stars {
    color: var(--warning);
    font-size: 0.875rem;
}

.rating-count {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.product-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.product-price {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--gray-900);
}

.product-price-old {
    font-size: 0.875rem;
    color: var(--gray-400);
    text-decoration: line-through;
    margin-left: 0.5rem;
}

.btn-buy {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* Quiz Section */
.quiz-section {
    padding: 5rem 0;
    background: var(--gray-50);
}

.quiz-container {
    max-width: 700px;
    margin: 0 auto;
    background: var(--white);
    border-radius: var(--radius-2xl);
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
}

.quiz-progress {
    margin-bottom: 2rem;
}

.progress-bar {
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: var(--radius);
    transition: width 0.3s ease;
    width: 25%;
}

.progress-text {
    display: block;
    text-align: center;
    margin-top: 0.75rem;
    font-size: 0.875rem;
    color: var(--gray-500);
}

.quiz-question {
    text-align: center;
    margin-bottom: 2rem;
}

.quiz-question h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.quiz-question p {
    color: var(--gray-500);
}

.quiz-options {
    display: grid;
    gap: 1rem;
}

.quiz-option {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--gray-50);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
}

.quiz-option:hover {
    border-color: var(--primary);
    background: var(--white);
}

.quiz-option.selected {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.05);
}

.option-icon {
    font-size: 2rem;
    line-height: 1;
}

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

.option-title {
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.25rem;
}

.option-desc {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.quiz-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--gray-200);
}

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

.result-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.quiz-result h3 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

.result-product {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: 2rem;
    margin: 1.5rem 0;
}

.result-product-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.result-product-reason {
    color: var(--gray-600);
    margin-bottom: 1rem;
}

.result-product-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 1rem;
}

.hidden {
    display: none !important;
}

/* Compare Section */
.compare-section {
    padding: 5rem 0;
}

.compare-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.compare-slot {
    position: relative;
}

.compare-select {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    background: var(--white);
    cursor: pointer;
    transition: var(--transition);
}

.compare-select:focus {
    outline: none;
    border-color: var(--primary);
}

.compare-table-container {
    overflow-x: auto;
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-200);
}

.compare-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

.compare-table th,
.compare-table td {
    padding: 1rem 1.25rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.compare-table th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-900);
}

.compare-table th:first-child {
    width: 150px;
}

.compare-table tr:last-child td {
    border-bottom: none;
}

.compare-table .product-header {
    text-align: center;
    padding: 1.5rem;
}

.compare-table .product-header-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.compare-table .product-header-name {
    font-weight: 700;
    color: var(--gray-900);
}

.compare-table .feature-check {
    color: var(--success);
    font-size: 1.25rem;
}

.compare-table .feature-cross {
    color: var(--gray-300);
    font-size: 1.25rem;
}

.compare-empty {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--gray-50);
    border-radius: var(--radius-xl);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.compare-empty p {
    color: var(--gray-500);
    font-size: 1.125rem;
}

/* Features Section */
.features-section {
    padding: 5rem 0;
    background: var(--gray-50);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--radius-xl);
    text-align: center;
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--gray-500);
    font-size: 0.9375rem;
}

/* SEO Section */
.seo-section {
    padding: 5rem 0;
    background: var(--white);
}

.seo-content {
    max-width: 900px;
    margin: 0 auto;
}

.seo-content h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--gray-900);
}

.seo-content h3 {
    font-size: 1.375rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--gray-800);
}

.seo-content p {
    margin-bottom: 1rem;
    color: var(--gray-600);
    line-height: 1.8;
}

.seo-content strong {
    color: var(--gray-800);
}

/* Footer */
.footer {
    background: var(--gray-900);
    color: var(--gray-400);
    padding: 4rem 0 2rem;
}

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

@media (min-width: 768px) {
    .footer-content {
        grid-template-columns: 2fr 3fr;
    }
}

.footer-brand p {
    margin-top: 1rem;
    font-size: 0.9375rem;
}

.footer-brand .logo {
    color: var(--white);
}

.footer-brand .logo-suffix {
    color: var(--gray-500);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 2rem;
}

.footer-column h4 {
    color: var(--white);
    font-size: 1rem;
    margin-bottom: 1rem;
}

.footer-column a {
    display: block;
    color: var(--gray-400);
    font-size: 0.9375rem;
    padding: 0.375rem 0;
}

.footer-column a:hover {
    color: var(--white);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--gray-800);
    text-align: center;
    font-size: 0.875rem;
}

.affiliate-disclosure {
    margin-top: 0.75rem;
    font-size: 0.8125rem;
    color: var(--gray-500);
}

/* Utility Classes */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

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

.fade-in {
    animation: fadeIn 0.4s ease forwards;
}

/* Responsive */
@media (max-width: 767px) {
    .hero {
        padding: 7rem 0 3rem;
    }

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

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

    .hero-stats {
        gap: 1.5rem;
    }

    .stat-number {
        font-size: 1.5rem;
    }

    .quiz-container {
        padding: 1.5rem;
    }

    .quiz-question h3 {
        font-size: 1.25rem;
    }

    .quiz-option {
        padding: 1rem;
    }

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

    .section-header h2 {
        font-size: 1.75rem;
    }

    .seo-content h2 {
        font-size: 1.5rem;
    }

    .seo-content h3 {
        font-size: 1.25rem;
    }
}