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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #f59e0b;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --background-color: #ffffff;
    --background-light: #f9fafb;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --error-color: #ef4444;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --border-radius: 8px;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 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);
}

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--text-color);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

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

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: var(--border-radius);
    z-index: 1000;
}

.skip-link:focus {
    top: 6px;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

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

.nav {
    padding: 1rem 0;
}

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

.nav-brand img {
    height: 50px;
    width: auto;
}

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

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.nav-toggle {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    flex-direction: column;
    gap: 4px;
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    transition: all 0.3s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Mobile Menu */
@media (max-width: 768px) {
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--background-color);
        flex-direction: column;
        padding: 1rem;
        border-top: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu[aria-hidden="true"] {
        display: none;
    }
    
    .nav-menu[aria-hidden="false"] {
        display: flex;
    }
}

@media (min-width: 769px) {
    .nav-menu {
        display: flex;
    }
    
    .nav-toggle {
        display: none;
    }
}

/* Hero Section */
.hero {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--background-light) 0%, var(--background-color) 100%);
}

.hero .container {
    display: grid;
    gap: 2rem;
    align-items: center;
}

.hero-content h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.hero-description {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    color: var(--text-light);
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
}

@media (min-width: 768px) {
    .hero .container {
        grid-template-columns: 1fr 1fr;
    }
    
    .hero-content h1 {
        font-size: 3rem;
    }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

.btn-outline {
    background-color: transparent;
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

.btn-outline:hover,
.btn-outline:focus {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Products Section */
.products {
    padding: 4rem 0;
    background-color: var(--background-color);
}

.products h2 {
    text-align: center;
    margin-bottom: 3rem;
}

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

.product-card {
    background-color: var(--background-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.product-card img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.product-content {
    padding: 1.5rem;
}

.product-content h3 {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.product-content p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

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

.product-features span {
    background-color: var(--background-light);
    color: var(--text-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
}

/* FAQ Section */
.faq {
    padding: 4rem 0;
    background-color: var(--background-light);
}

.faq h2 {
    text-align: center;
    margin-bottom: 3rem;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--background-color);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.faq-item h3 {
    padding: 1.5rem;
    margin: 0;
    background-color: var(--background-light);
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.faq-item h3:hover {
    background-color: var(--border-color);
}

.faq-item p {
    padding: 0 1.5rem 1.5rem;
    margin: 0;
}

/* How-to Section */
.how-to {
    padding: 4rem 0;
    background-color: var(--background-color);
}

.how-to h2 {
    text-align: center;
    margin-bottom: 3rem;
}

.how-to-steps {
    max-width: 800px;
    margin: 0 auto;
}

.step {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background-color: var(--background-light);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
}

.step h3 {
    margin: 0;
    color: var(--primary-color);
}

.step p {
    margin: 0;
}

/* Footer */
.footer {
    background-color: var(--text-color);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    color: white;
    margin-bottom: 1rem;
}

.footer-section p {
    color: #9ca3af;
    margin-bottom: 1rem;
}

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

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

.footer-section ul li a {
    color: #9ca3af;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover,
.footer-section ul li a:focus {
    color: white;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    color: #9ca3af;
    text-decoration: none;
    transition: color 0.3s ease;
}

.social-links a:hover,
.social-links a:focus {
    color: white;
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 1rem;
    text-align: center;
    color: #9ca3af;
}

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

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

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-5 { margin-bottom: 1.25rem; }
.mb-6 { margin-bottom: 1.5rem; }

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Error States */
.error {
    color: var(--error-color);
    background-color: #fef2f2;
    border: 1px solid #fecaca;
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
}

/* Success States */
.success {
    color: var(--success-color);
    background-color: #f0fdf4;
    border: 1px solid #bbf7d0;
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
}

/* Print Styles */
@media print {
    .nav,
    .footer,
    .btn {
        display: none;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
    
    h1, h2, h3 {
        page-break-after: avoid;
    }
    
    .product-card {
        page-break-inside: avoid;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0000ff;
        --text-color: #000000;
        --background-color: #ffffff;
        --border-color: #000000;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}