/* ============================================
   CSS VARIABLES (Light & Dark Themes)
   ============================================ */
:root {
    /* Light Theme (Default) */
    --bg-primary: #F8FAFC;
    --bg-secondary: #FFFFFF;
    --bg-card: #FFFFFF;
    --bg-code: #0F172A;
    --text-primary: #111827;
    --text-secondary: #64748B;
    --text-white: #FFFFFF;
    --border-color: #E5E7EB;
    --primary: #6366F1;
    --primary-hover: #4F46E5;
    --success: #10B981;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.08);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s ease;
    --max-width: 1200px;
    --content-width: 800px;
}

[data-theme="dark"] {
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --bg-card: #1E293B;
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-white: #F1F5F9;
    --border-color: #334155;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.4);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    transition: background var(--transition), color var(--transition);
    min-height: 100vh;
}

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

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

/* ============================================
   CONTAINERS
   ============================================ */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.content-container {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background var(--transition), border-color var(--transition);
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.9);
}

[data-theme="dark"] .navbar {
    background: rgba(15, 23, 42, 0.95);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.navbar .logo {
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    transition: color var(--transition);
}

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

.navbar .logo .logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: white;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 700;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
    background: var(--bg-primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Search */
.search-wrapper {
    position: relative;
}

.search-wrapper input {
    padding: 8px 14px 8px 36px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition);
    width: 180px;
    outline: none;
}

.search-wrapper input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.search-wrapper input::placeholder {
    color: var(--text-secondary);
}

.search-wrapper .search-icon {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 14px;
}

/* Theme Toggle */
.theme-toggle {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 18px;
    transition: all var(--transition);
    color: var(--text-secondary);
    flex-shrink: 0;
}

.theme-toggle:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* Hamburger Menu */
.hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-primary);
    cursor: pointer;
    padding: 4px;
}

/* ============================================
   HERO / WELCOME
   ============================================ */
.hero {
    text-align: center;
    padding: 48px 0 32px;
}

.hero h1 {
    font-size: 36px;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 8px;
}

.hero h1 span {
    color: var(--primary);
}

.hero p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto;
}

/* ============================================
   POST GRID
   ============================================ */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 28px;
    padding: 24px 0 48px;
}

/* ============================================
   POST CARD
   ============================================ */
.post-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all var(--transition);
    cursor: pointer;
}

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

/* ============================================
   POST CARD - IMAGE (UPDATED)
   ============================================ */
.post-card .card-image {
    width: 100%;
    height: 280px; /* ← INCREASED from 200px */
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    color: var(--text-secondary);
    position: relative;
    overflow: hidden;
}

/* Make images fill the card properly */
.post-card .card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;  /* ← Fills the space without stretching */
}

.post-card .card-image .category-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    background: var(--primary);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    z-index: 5;
}

.post-card .card-image .placeholder-text {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-secondary);
    opacity: 0.3;
}

.post-card .card-body {
    padding: 20px 24px 24px;
}

.post-card .card-body .post-meta {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.post-card .card-body h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 8px;
    line-height: 1.3;
    color: var(--text-primary);
}

.post-card .card-body h3 a {
    color: var(--text-primary);
    transition: color var(--transition);
}

.post-card .card-body h3 a:hover {
    color: var(--primary);
}

.post-card .card-body p {
    font-size: 15px;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-card .card-body .read-link {
    display: inline-block;
    margin-top: 12px;
    font-weight: 600;
    font-size: 14px;
    color: var(--primary);
}

.post-card .card-body .read-link:hover {
    color: var(--primary-hover);
}

/* ============================================
   SINGLE POST
   ============================================ */
.single-post {
    padding: 32px 0 48px;
}

.single-post .post-header {
    margin-bottom: 32px;
}

.single-post .post-header .post-category {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 12px;
}

.single-post .post-header h1 {
    font-size: 38px;
    font-weight: 800;
    letter-spacing: -0.5px;
    line-height: 1.2;
    margin-bottom: 12px;
}

.single-post .post-header .post-meta {
    display: flex;
    gap: 20px;
    font-size: 14px;
    color: var(--text-secondary);
    flex-wrap: wrap;
}

.single-post .post-header .post-meta .dot {
    color: var(--text-secondary);
    opacity: 0.3;
}

/* ============================================
   SINGLE POST - FEATURED IMAGE (UPDATED)
   ============================================ */
.single-post .featured-image {
    width: 100%;
    height: 420px; /* ← INCREASED from 320px */
    background: var(--bg-primary);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 64px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

/* Make featured image fill the space */
.single-post .featured-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;  /* ← Fills the space without stretching */
}

.single-post .featured-image .placeholder-text {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-secondary);
    opacity: 0.2;
}

.single-post .post-content {
    font-size: 17px;
    line-height: 1.8;
}

.single-post .post-content h2 {
    font-size: 24px;
    font-weight: 700;
    margin: 32px 0 12px;
}

.single-post .post-content p {
    margin-bottom: 16px;
    color: var(--text-primary);
}

/* Code Blocks */
.single-post .post-content .code-block-wrapper {
    position: relative;
    margin: 20px 0;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.single-post .post-content .code-block-wrapper .code-header {
    background: #1a2332;
    padding: 8px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #2a3344;
}

.single-post .post-content .code-block-wrapper .code-header .code-label {
    font-size: 12px;
    font-weight: 600;
    color: #94A3B8;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.single-post .post-content .code-block-wrapper .code-header .copy-btn {
    background: none;
    border: none;
    color: #94A3B8;
    cursor: pointer;
    font-size: 13px;
    padding: 4px 12px;
    border-radius: 4px;
    transition: all var(--transition);
    font-family: 'Inter', sans-serif;
}

.single-post .post-content .code-block-wrapper .code-header .copy-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: white;
}

.single-post .post-content pre {
    margin: 0 !important;
    border-radius: 0 !important;
    background: var(--bg-code) !important;
    padding: 20px !important;
    overflow-x: auto;
}

.single-post .post-content pre code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 14px;
    line-height: 1.6;
    color: #e2e8f0;
}

/* Live Preview */
.single-post .live-preview {
    margin: 24px 0;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.single-post .live-preview .preview-header {
    background: var(--bg-primary);
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.single-post .live-preview .preview-header .preview-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

.single-post .live-preview .preview-header .run-btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 6px 20px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    font-family: 'Inter', sans-serif;
}

.single-post .live-preview .preview-header .run-btn:hover {
    background: var(--primary-hover);
    transform: scale(1.02);
}

.single-post .live-preview .preview-frame {
    width: 100%;
    height: 320px;
    border: none;
    background: white;
    display: block;
}

.single-post .live-preview .preview-empty {
    padding: 40px;
    text-align: center;
    color: var(--text-secondary);
    background: var(--bg-primary);
}

/* Tags */
.single-post .post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 24px 0 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.single-post .post-tags .tag {
    background: var(--bg-primary);
    color: var(--text-secondary);
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid var(--border-color);
}

.single-post .post-tags .tag:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* Related Articles */
.related-section {
    padding: 32px 0;
    border-top: 1px solid var(--border-color);
    margin-top: 16px;
}

.related-section h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 20px;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}

.related-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    transition: all var(--transition);
}

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

.related-card h4 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 4px;
}

.related-card h4 a {
    color: var(--text-primary);
}

.related-card h4 a:hover {
    color: var(--primary);
}

.related-card .related-meta {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ============================================
   LOADING & EMPTY STATES
   ============================================ */
.loading-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.loading-state .spinner {
    display: inline-block;
    width: 32px;
    height: 32px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 12px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state .empty-icon {
    font-size: 48px;
    opacity: 0.3;
    margin-bottom: 12px;
}

.empty-state h3 {
    font-size: 20px;
    color: var(--text-primary);
    margin-bottom: 4px;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 32px 0;
    margin-top: 32px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
    transition: background var(--transition), border-color var(--transition);
}

.footer .social-links {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 12px;
}

.footer .social-links a {
    color: var(--text-secondary);
    font-size: 20px;
    transition: color var(--transition);
}

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

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 992px) {
    .posts-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 20px;
    }

    .single-post .post-header h1 {
        font-size: 30px;
    }

    .single-post .featured-image {
        height: 320px; /* Slightly smaller on tablets */
    }

    .related-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: block;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        padding: 12px 0;
        gap: 4px;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links a {
        width: 100%;
        padding: 10px 14px;
    }

    .search-wrapper input {
        width: 140px;
    }

    .posts-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .post-card .card-image {
        height: 220px; /* Slightly smaller on mobile */
    }

    .single-post .post-header h1 {
        font-size: 26px;
    }

    .single-post .featured-image {
        height: 250px; /* Smaller on mobile */
    }

    .single-post .post-content {
        font-size: 16px;
    }

    .single-post .post-content pre code {
        font-size: 13px;
    }

    .single-post .live-preview .preview-frame {
        height: 240px;
    }

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

    .hero h1 {
        font-size: 28px;
    }

    .hero p {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .navbar .container {
        flex-wrap: wrap;
    }

    .nav-actions {
        margin-left: auto;
    }

    .search-wrapper input {
        width: 120px;
        font-size: 13px;
    }

    .post-card .card-image {
        height: 180px; /* Even smaller on phones */
    }

    .single-post .post-header h1 {
        font-size: 22px;
    }

    .single-post .post-header .post-meta {
        font-size: 13px;
        gap: 12px;
    }

    .single-post .featured-image {
        height: 200px; /* Even smaller on phones */
    }
}

/* ============================================
   FOOTER (Extended)
   ============================================ */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 48px 0 24px;
    margin-top: 48px;
    transition: background var(--transition), border-color var(--transition);
}

.footer .footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 48px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border-color);
}

.footer .footer-brand .footer-logo {
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
    transition: color var(--transition);
}

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

.footer .footer-brand .footer-logo .logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: white;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 700;
}

.footer .footer-brand p {
    color: var(--text-secondary);
    font-size: 15px;
    max-width: 320px;
    line-height: 1.6;
}

.footer .footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.footer .footer-column h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: color var(--transition);
}

.footer .footer-column a {
    display: block;
    color: var(--text-secondary);
    font-size: 14px;
    padding: 4px 0;
    transition: color var(--transition);
}

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

.footer .footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 24px;
    gap: 16px;
    flex-wrap: wrap;
}

.footer .footer-bottom p {
    color: var(--text-secondary);
    font-size: 14px;
    opacity: 0.7;
}

/* ============================================
   RESPONSIVE - Footer
   ============================================ */
@media (max-width: 992px) {
    .footer .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer .footer-brand p {
        max-width: 100%;
    }

    .footer .footer-links {
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
}

@media (max-width: 768px) {
    .footer {
        padding: 32px 0 16px;
        margin-top: 32px;
    }

    .footer .footer-links {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }

    .footer .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: 8px;
    }
}

@media (max-width: 480px) {
    .footer .footer-links {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .footer .footer-content {
        gap: 24px;
    }
}