/* Fonts */

@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 300 700;
    font-display: swap;
    src: url('../fonts/Inter-latin.woff2') format('woff2');
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 300 700;
    font-display: swap;
    src: url('../fonts/Inter-latin-ext.woff2') format('woff2');
    unicode-range: U+0100-02AF, U+0304, U+0308, U+0329, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

/* Foundation */

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

:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-bg: #ffffff;
    --color-bg-alt: #f9fafb;
    --color-border: #e5e7eb;
    --color-shadow: rgba(0, 0, 0, 0.1);

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    --container-width: 1200px;
    --content-width: 800px;
    --border-radius: 8px;
    --transition: 0.2s ease;
}

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

body {
    font-family: var(--font-sans);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

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

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

h5 {
    font-size: 1.125rem;
}

h6 {
    font-size: 1rem;
}

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

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

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

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

.main-content {
    flex: 1;
}

/* Header */

.site-header {
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.9);
}

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

.site-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    transition: color var(--transition);
}

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

.site-nav {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--color-text-light);
    font-weight: 500;
    padding: var(--spacing-xs) 0;
    position: relative;
    transition: color var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text);
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

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

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

.header-social-links a {
    color: var(--color-text-light);
    transition: all var(--transition);
}

.header-social-links a:hover {
    color: var(--color-primary);
    transform: translateY(-2px);
}

/* Posts */

.page-header {
    margin: var(--spacing-xl) 0;
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-border);
}

.page-header h1 {
    margin-bottom: var(--spacing-xs);
}

.page-description {
    color: var(--color-text-light);
    font-size: 1.125rem;
}

.section-title {
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.posts-list {
    display: grid;
    gap: var(--spacing-lg);
    padding-top: var(--spacing-lg);
}

.post-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 0;
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition);
    display: flex;
    flex-direction: row;
    text-decoration: none;
    color: inherit;
}

.post-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px var(--color-shadow);
}

.post-card:hover .post-title {
    color: var(--color-primary);
}

.post-card-image {
    display: block;
    width: 200px;
    flex-shrink: 0;
    overflow: hidden;
    position: relative;
    align-self: stretch;
}

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

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

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

.post-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.post-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.tag {
    background-color: var(--color-bg-alt);
    color: var(--color-text-light);
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
}

.post-title {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.post-description {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.read-more {
    color: var(--color-primary);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.read-more:hover {
    gap: 0.5rem;
}

/* Post */

.post {
    padding: var(--spacing-xl) 0;
}

.post .container {
    max-width: var(--container-width);
}

.post-header-content {
    margin-bottom: var(--spacing-xl);
    text-align: center;
    max-width: var(--content-width);
    margin-left: auto;
    margin-right: auto;
}

.post-featured-image {
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
}

.post-featured-image img {
    width: 100%;
    height: auto;
    max-height: 400px;
    object-fit: cover;
    display: block;
}

.post-header h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.post-header .post-meta {
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.post-header .post-description {
    font-size: 1.25rem;
    color: var(--color-text-light);
}

.post-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: var(--spacing-xl);
    align-items: start;
}

.toc-sidebar {
    order: 2;
    position: sticky;
    top: calc(70px + var(--spacing-md));
    align-self: start;
    max-height: calc(100vh - 70px - var(--spacing-lg));
}

.post-content {
    order: 1;
    max-width: var(--content-width);
    min-width: 0;
}

.toc-wrapper {
    background-color: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    max-height: calc(100vh - 70px - var(--spacing-lg));
    overflow-y: auto;
}

.toc-wrapper::-webkit-scrollbar {
    width: 6px;
}

.toc-wrapper::-webkit-scrollbar-track {
    background: transparent;
}

.toc-wrapper::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

.toc-wrapper::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-light);
}

.toc-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin: 0 0 var(--spacing-sm) 0;
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
}

.toc-wrapper nav#TableOfContents {
    background-color: transparent;
    border: none;
    padding: 0;
    margin: 0;
}

nav#TableOfContents ul {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

nav#TableOfContents>ul>li {
    margin-bottom: 0.25rem;
}

nav#TableOfContents ul ul {
    padding-left: var(--spacing-md);
    margin-top: 0.25rem;
    border-left: 2px solid var(--color-border);
}

nav#TableOfContents a {
    display: block;
    padding: 0.25rem 0;
    color: var(--color-text-light);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition);
}

nav#TableOfContents a:hover {
    color: var(--color-primary);
    padding-left: 0.5rem;
}

nav#TableOfContents a.active {
    color: var(--color-primary);
    font-weight: 600;
    border-left: 3px solid var(--color-primary);
    padding-left: 0.5rem;
}

.post-content {
    font-size: 1.125rem;
    line-height: 1.8;
}

.post-content h2,
.post-content h3,
.post-content h4 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    margin: var(--spacing-lg) 0;
}

.post-content pre {
    background-color: var(--color-bg-alt);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: var(--spacing-md) 0;
}

.post-content code {
    background-color: var(--color-bg-alt);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-size: 0.9em;
}

.post-content pre code {
    background-color: transparent;
    padding: 0;
}

.post-content blockquote {
    border-left: 4px solid var(--color-primary);
    padding-left: var(--spacing-md);
    margin: var(--spacing-md) 0;
    color: var(--color-text-light);
    font-style: italic;
}

.post-content ul,
.post-content ol {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-lg);
}

.post-content li {
    margin-bottom: var(--spacing-xs);
}

/* Pagination */

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xl);
    flex-wrap: wrap;
}

.pagination-item {
    min-width: 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-text);
    font-weight: 500;
    transition: all var(--transition);
    text-decoration: none;
    background-color: var(--color-bg);
}

.pagination-item:hover:not(.disabled):not(.active) {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
    transform: translateY(-1px);
}

.pagination-item.active {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.pagination-item.disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
    color: var(--color-text-light);
}

/* Footer */

.site-footer {
    background-color: var(--color-bg-alt);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    margin-top: var(--spacing-2xl);
    display: flex;
    justify-content: center;
    width: 100%;
}

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

/* Not found Page */

.not-found-page {
    text-align: center;
    padding-top: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
}

.not-found-page h1 {
    font-size: 6rem;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, #0f172a 0%, #1e40af 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.not-found-page p {
    font-size: 1.5rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.button {
    display: inline-block;
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: all var(--transition);
}

.button:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--color-shadow);
}

/* Media Queries */

@media (max-width: 1024px) {
    .post-layout {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .toc-sidebar {
        order: 1;
        position: static;
        max-height: none;
    }

    .post-content {
        order: 2;
    }

    .toc-wrapper {
        max-height: none;
        margin-bottom: var(--spacing-xl);
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-base: 15px;
    }

    .hero {
        padding: 3rem 0 2.5rem;
    }

    .hero-title {
        font-size: 2.25rem;
        line-height: 1.2;
    }

    .hero-description {
        font-size: 1.125rem;
        line-height: 1.5;
        margin-bottom: var(--spacing-md);
    }

    .hero-accent {
        width: 50px;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    .site-nav {
        display: none;
    }

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

    .post {
        padding: 0;
    }

    .post-card {
        flex-direction: column;
    }

    .post-card-image {
        width: 100%;
        height: auto;
        aspect-ratio: 16 / 9;
    }

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

    .post-card .post-title {
        margin-bottom: var(--spacing-xs);
    }

    .post-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
        margin-bottom: var(--spacing-md);
        margin-top: 0;
    }

    .post-tags {
        flex-wrap: nowrap;
        overflow-x: auto;
        width: 100%;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }

    .post-tags::-webkit-scrollbar {
        display: none;
    }

    .tag {
        white-space: nowrap;
        flex-shrink: 0;
    }

    .post-header h1 {
        font-size: 2rem;
    }

    .post-content {
        font-size: 1rem;
    }

    .post-featured-image {
        width: 100vw;
        margin-left: calc(50% - 50vw);
        margin-right: calc(50% - 50vw);
        border-radius: 0;
    }

    .post-featured-image img {
        max-height: 250px;
    }

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

    .error-page h1 {
        font-size: 4rem;
    }

    .pagination {
        margin-top: var(--spacing-lg);
    }

    .pagination-item {
        min-width: 36px;
        height: 36px;
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding-left: var(--spacing-sm);
        padding-right: var(--spacing-sm);
    }

    .post-card-content {
        padding: var(--spacing-sm);
    }

    .hero {
        padding: 2.5rem 0 2rem;
    }

    .hero-title {
        font-size: 1.875rem;
    }

    .hero-description {
        font-size: 1rem;
        margin-bottom: var(--spacing-sm);
    }

    .hero-accent {
        width: 40px;
        height: 3px;
    }

    .pagination {
        gap: 0.25rem;
        margin-top: var(--spacing-md);
    }

    .pagination-item {
        min-width: 32px;
        height: 32px;
        padding: 0 0.5rem;
        font-size: 0.8125rem;
    }
}