:root {
    --color-primary: #3a86ff;
    --color-secondary: #8338ec;
    --color-dark: #212529;
    --color-light: #f8f9fa;
    --color-white: #ffffff;
    --color-gray-300: #dee2e6;
    --color-gray-500: #6c757d;
    --color-gray-700: #495057;
    --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 16px;
    --font-size-h1: 48px;
    --font-size-h2: 36px;
    --font-size-h3: 28px;
    --font-size-h4: 24px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
    --transition-base: all 0.3s ease;
}

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-dark);
    background-color: var(--color-light);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-dark);
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }

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

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

a:hover, a:focus {
    color: var(--color-secondary);
    text-decoration: underline;
}

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

/* Header */
.site-header {
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-gray-300);
    padding: var(--spacing-lg) 0;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: var(--font-size-h3);
    margin: 0;
}

.site-title a {
    color: var(--color-dark);
    text-decoration: none;
}

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

.site-description {
    font-size: 14px;
    color: var(--color-gray-500);
    margin: var(--spacing-sm) 0 0;
}

/* Navigation */
.main-navigation ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-lg);
}

.main-navigation a {
    color: var(--color-dark);
    font-weight: 600;
    text-decoration: none;
    padding: var(--spacing-sm) 0;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.hamburger span {
    width: 24px;
    height: 3px;
    background-color: var(--color-dark);
    border-radius: 2px;
    transition: var(--transition-base);
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    padding: var(--spacing-2xl) var(--spacing-lg);
    text-align: center;
    border-radius: 8px;
    margin: var(--spacing-2xl) 0;
}

.hero-title {
    font-size: var(--font-size-h1);
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 18px;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
}

.search-box {
    max-width: 500px;
    margin: 0 auto;
}

.search-box form {
    display: flex;
    gap: var(--spacing-sm);
}

.search-box input[type="search"] {
    flex: 1;
    padding: var(--spacing-md);
    border: none;
    border-radius: 4px;
    font-size: var(--font-size-base);
}

.search-box button {
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--color-dark);
    color: var(--color-white);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
}

/* Posts Grid */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin: var(--spacing-2xl) 0;
}

/* Post Card */
.post-card {
    background: var(--color-white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    display: flex;
    flex-direction: column;
    height: 100%;
}

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

.post-card__image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background-color: var(--color-gray-300);
}

.post-card__image-link {
    display: block;
    width: 100%;
    height: 100%;
}

.post-card__image-link img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.post-card:hover .post-card__image-link img {
    transform: scale(1.05);
}

.post-card__image-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
}

.placeholder-icon {
    font-size: 48px;
    font-weight: bold;
}

.post-card__content {
    padding: var(--spacing-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.post-card__category {
    display: inline-block;
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 4px var(--spacing-md);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-decoration: none;
    margin-bottom: var(--spacing-md);
    width: fit-content;
    text-transform: uppercase;
}

.post-card__category:hover {
    background-color: var(--color-secondary);
}

.post-card__title {
    font-size: var(--font-size-h4);
    margin-bottom: var(--spacing-md);
    flex: 1;
}

.post-card__title a {
    color: var(--color-dark);
    text-decoration: none;
}

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

.post-card__excerpt {
    color: var(--color-gray-700);
    font-size: 14px;
    margin-bottom: var(--spacing-md);
}

.post-card__footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-gray-300);
    margin-top: auto;
}

.post-card__date {
    font-size: 13px;
    color: var(--color-gray-500);
}

.post-card__link {
    color: var(--color-primary);
    font-weight: 600;
    text-decoration: none;
}

/* Single Post */
.single-post {
    background: var(--color-white);
    border-radius: 8px;
    padding: var(--spacing-2xl);
    margin: var(--spacing-2xl) 0;
    box-shadow: var(--shadow-sm);
}

.post-header {
    margin-bottom: var(--spacing-2xl);
    border-bottom: 2px solid var(--color-gray-300);
    padding-bottom: var(--spacing-xl);
}

.post-title {
    font-size: var(--font-size-h1);
    margin-bottom: var(--spacing-lg);
}

.post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    font-size: 14px;
    color: var(--color-gray-700);
}

.post-meta .label {
    font-weight: 600;
    color: var(--color-dark);
}

.post-thumbnail {
    margin: var(--spacing-xl) 0;
    border-radius: 8px;
    overflow: hidden;
}

.post-thumbnail img {
    width: 100%;
    height: auto;
}

.post-body {
    font-size: 18px;
    line-height: 1.8;
    margin: var(--spacing-xl) 0;
}

.post-tags {
    background-color: var(--color-light);
    padding: var(--spacing-lg);
    border-radius: 8px;
    margin: var(--spacing-xl) 0;
}

.tags-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tag {
    display: inline-block;
    background-color: var(--color-light);
    color: var(--color-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 20px;
    border: 1px solid var(--color-primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
}

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

/* Navigation */
.posts-navigation {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin: var(--spacing-2xl) 0;
    padding: var(--spacing-xl) 0;
    border-top: 2px solid var(--color-gray-300);
}

.nav-link {
    display: block;
    text-decoration: none;
    color: var(--color-primary);
}

.nav-label {
    display: block;
    font-size: 14px;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.nav-title {
    display: block;
    font-size: 18px;
    color: var(--color-dark);
    font-weight: 600;
}

.nav-next {
    text-align: right;
}

/* Related Posts */
.related-posts {
    margin: var(--spacing-2xl) 0;
    padding-top: var(--spacing-xl);
    border-top: 2px solid var(--color-gray-300);
}

/* Archive */
.archive-header {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    padding: var(--spacing-2xl) var(--spacing-lg);
    border-radius: 8px;
    margin: var(--spacing-xl) 0 var(--spacing-2xl);
}

.page-title {
    color: var(--color-white);
    font-size: var(--font-size-h1);
    margin: 0;
}

.category-description {
    font-size: 18px;
    margin: var(--spacing-md) 0 0;
    opacity: 0.95;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin: var(--spacing-2xl) 0;
}

.pagination a, .pagination span {
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
    text-decoration: none;
    border-radius: 4px;
}

.pagination a:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
}

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

/* Footer */
.site-footer {
    background-color: var(--color-dark);
    color: var(--color-light);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

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

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

.site-footer__column h4 {
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.site-footer__column a {
    color: var(--color-gray-300);
}

.site-footer__column ul {
    list-style: none;
}

.site-footer__column li {
    margin-bottom: var(--spacing-sm);
}

.site-footer__bottom {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 14px;
    color: var(--color-gray-500);
}

/* Responsive */
@media (max-width: 768px) {
    :root {
        --font-size-h1: 36px;
        --font-size-h2: 28px;
    }

    .menu-toggle {
        display: flex;
    }

    .main-navigation {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-white);
        padding: var(--spacing-lg);
    }

    .main-navigation.active {
        display: block;
    }

    .main-navigation ul {
        flex-direction: column;
    }

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

    .posts-navigation {
        grid-template-columns: 1fr;
    }

    .nav-next {
        text-align: left;
    }
}

.screen-reader-text {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
}