/* ==========================================
   RESET & BASE STYLES
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1a1a1a;
    --secondary-color: #f8f8f8;
    --accent-color: #666;
    --white: #ffffff;
    --border-color: #e5e5e5;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--primary-color);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    transition: var(--transition);
}

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

/* ==========================================
   HEADER & NAVIGATION
   ========================================== */
.header {
    position: sticky;
    top: 0;
    background-color: var(--white);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    min-height: 70px;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    font-size: 1.2rem;
    letter-spacing: -0.5px;
}

.logo svg {
    transition: var(--transition);
}

.logo:hover svg {
    transform: rotate(180deg);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 10px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-menu a {
    font-weight: 400;
    font-size: 0.95rem;
    letter-spacing: 0.3px;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

/* ==========================================
   HERO SECTION
   ========================================== */
.hero {
    padding: var(--spacing-xl) 0;
    text-align: center;
    background: linear-gradient(180deg, var(--secondary-color) 0%, var(--white) 100%);
}

.hero-title {
    font-size: 4rem;
    font-weight: 300;
    letter-spacing: -2px;
    margin-bottom: var(--spacing-sm);
    animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--accent-color);
    font-weight: 300;
    letter-spacing: 0.5px;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

/* ==========================================
   SEARCH & FILTER
   ========================================== */
.search-section {
    padding: var(--spacing-lg) 0;
    background-color: var(--white);
}

.search-bar {
    display: flex;
    max-width: 600px;
    margin: 0 auto var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    overflow: hidden;
    transition: var(--transition);
}

.search-bar:focus-within {
    box-shadow: var(--shadow);
    border-color: var(--primary-color);
}

#searchInput {
    flex: 1;
    padding: 1rem 1.5rem;
    border: none;
    outline: none;
    font-size: 1rem;
    background: transparent;
}

#searchBtn {
    padding: 0 1.5rem;
    color: var(--accent-color);
}

#searchBtn:hover {
    color: var(--primary-color);
}

.categories {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
}

.category-btn {
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 0.9rem;
    color: var(--accent-color);
    background-color: var(--white);
    transition: var(--transition);
}

.category-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

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

/* ==========================================
   ARTICLES GRID
   ========================================== */
.main-content {
    padding: var(--spacing-lg) 0;
    min-height: 60vh;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.article-card {
    background-color: var(--white);
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition);
    opacity: 0;
    animation: fadeInUp 0.6s ease-out forwards;
}

.article-card:nth-child(1) { animation-delay: 0.1s; }
.article-card:nth-child(2) { animation-delay: 0.2s; }
.article-card:nth-child(3) { animation-delay: 0.3s; }
.article-card:nth-child(4) { animation-delay: 0.4s; }
.article-card:nth-child(5) { animation-delay: 0.5s; }

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow);
}

.article-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/10;
    background-color: var(--secondary-color);
}

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

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

.article-content {
    padding: var(--spacing-md);
}

.article-category {
    display: inline-block;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-color);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.article-title {
    font-size: 1.5rem;
    font-weight: 500;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.5px;
}

.article-excerpt {
    color: var(--accent-color);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.article-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--accent-color);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-color);
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
    background-color: var(--secondary-color);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    margin-top: var(--spacing-xl);
}

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

.footer-section h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.5px;
}

.footer-section h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-section p {
    color: var(--accent-color);
    font-size: 0.95rem;
    line-height: 1.6;
}

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

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

.footer-section a {
    color: var(--accent-color);
    font-size: 0.9rem;
}

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

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-links a {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.social-links a:hover {
    background-color: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    color: var(--accent-color);
    font-size: 0.9rem;
}

/* ==========================================
   ANIMATIONS
   ========================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--white);
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
        border-bottom: 1px solid var(--border-color);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .hero-title {
        font-size: 2.5rem;
    }

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

    .articles-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .categories {
        gap: 0.5rem;
    }

    .category-btn {
        padding: 0.6rem 1rem;
        font-size: 0.85rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    :root {
        --spacing-lg: 2rem;
        --spacing-xl: 3rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .article-title {
        font-size: 1.3rem;
    }
}

/* ==========================================
   ARTICLE PAGE STYLES
   ========================================== */
.article-hero {
    padding: var(--spacing-lg) 0;
    max-width: 900px;
    margin: 0 auto;
}

.article-hero-image {
    aspect-ratio: 16/9;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    background-color: var(--secondary-color);
}

.article-hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.article-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.article-header .article-category {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.article-header h1 {
    font-size: 3rem;
    font-weight: 500;
    line-height: 1.2;
    letter-spacing: -1px;
    margin-bottom: var(--spacing-sm);
}

.article-header .article-meta {
    justify-content: center;
    gap: var(--spacing-md);
    border: none;
    padding: 0;
    margin-top: var(--spacing-sm);
}

.article-body {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
    font-size: 1.1rem;
    line-height: 1.8;
}

.article-body h2 {
    font-size: 2rem;
    font-weight: 500;
    margin: var(--spacing-lg) 0 var(--spacing-md);
    letter-spacing: -0.5px;
}

.article-body h3 {
    font-size: 1.5rem;
    font-weight: 500;
    margin: var(--spacing-md) 0 var(--spacing-sm);
}

.article-body p {
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.article-body ul, .article-body ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-md);
}

.article-body li {
    margin-bottom: var(--spacing-xs);
}

.article-body img {
    border-radius: 8px;
    margin: var(--spacing-lg) 0;
    width: 100%;
}

.article-body .image-caption {
    text-align: center;
    font-size: 0.9rem;
    color: var(--accent-color);
    margin-top: -var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.article-body a {
    color: #0f62fe;
    text-decoration: underline;
    font-weight: 600;
}

.article-body a:hover {
    color: #0043ce;
    text-decoration-color: #0043ce;
}

.product-recommendation {
    background-color: var(--secondary-color);
    padding: var(--spacing-md);
    border-radius: 8px;
    margin: var(--spacing-lg) 0;
    border-left: 3px solid var(--primary-color);
}

.product-recommendation h3 {
    margin-top: 0;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.product-item {
    background-color: var(--white);
    padding: var(--spacing-sm);
    border-radius: 8px;
    transition: var(--transition);
}

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

.product-item img {
    border-radius: 4px;
    margin-bottom: var(--spacing-sm);
    aspect-ratio: 1;
    object-fit: cover;
}

.product-item h4 {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.product-item p {
    font-size: 0.9rem;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.product-item .price {
    font-weight: 600;
    color: var(--primary-color);
}

/* ==========================================
   CONTACT & ABOUT PAGE STYLES
   ========================================== */
.page-hero {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    text-align: center;
    background: linear-gradient(180deg, var(--secondary-color) 0%, var(--white) 100%);
}

.page-hero h1 {
    font-size: 3rem;
    font-weight: 300;
    letter-spacing: -1px;
    margin-bottom: var(--spacing-sm);
}

.page-hero p {
    font-size: 1.2rem;
    color: var(--accent-color);
}

.page-content {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.submit-btn {
    width: 100%;
    padding: 1rem 2rem;
    background-color: var(--primary-color);
    color: var(--white);
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

.about-content {
    line-height: 1.8;
    font-size: 1.1rem;
}

.about-content h2 {
    font-size: 2rem;
    font-weight: 500;
    margin: var(--spacing-lg) 0 var(--spacing-md);
}

.about-content p {
    margin-bottom: var(--spacing-md);
}

/* ==========================================
   PRODUCTS PAGE STYLES
   ========================================== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.product-card {
    background-color: var(--white);
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow);
}

.product-card-image {
    aspect-ratio: 1;
    overflow: hidden;
    background-color: var(--secondary-color);
}

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

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

.product-card-content {
    padding: var(--spacing-md);
}

.product-card-category {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.product-card-title {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.product-card-description {
    color: var(--accent-color);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.product-card-price {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-color);
}