/**
 * TechTutorial.com - Styles
 * Education with an Explanation
 */

/* ============================================
   CSS Variables
   ============================================ */
:root {
    --color-bg: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-text: #f8fafc;
    --color-text-muted: #94a3b8;
    --color-text-dim: #64748b;
    --color-primary: #3b82f6;
    --color-primary-light: #60a5fa;
    --color-secondary: #8b5cf6;
    --color-accent: #34d399;
    --color-border: rgba(59, 130, 246, 0.2);
    --color-border-light: rgba(255, 255, 255, 0.1);
    --font-sans: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --transition: 0.2s ease;
}

/* ============================================
   Reset & Base
   ============================================ */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    min-height: 100vh;
    overflow-x: hidden;
}

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

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

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

/* ============================================
   Background Effects
   ============================================ */
.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: -2;
}

.orb {
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    pointer-events: none;
    z-index: -1;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: var(--color-primary);
    top: -150px;
    right: -150px;
}

.orb-2 {
    width: 300px;
    height: 300px;
    background: var(--color-secondary);
    bottom: -100px;
    left: -100px;
}

/* ============================================
   Container & Layout
   ============================================ */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.site-main {
    padding: 2rem 0 4rem;
    min-height: calc(100vh - 300px);
}

/* ============================================
   Header
   ============================================ */
.site-header {
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.logo-icon {
    width: 40px;
    height: 40px;
}

.logo-icon svg {
    width: 100%;
    height: 100%;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo .site-name {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-secondary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.logo .tagline {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    letter-spacing: 0.5px;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.main-nav > a,
.nav-dropdown-toggle {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.main-nav > a:hover,
.main-nav > a.active,
.nav-dropdown-toggle:hover {
    color: var(--color-text);
    background: rgba(255, 255, 255, 0.05);
}

.nav-dropdown {
    position: relative;
}

.nav-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition);
    box-shadow: var(--shadow-lg);
}

.nav-dropdown:hover .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-dropdown-menu a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
}

.nav-dropdown-menu a:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--color-text);
}

.nav-dropdown-menu .count {
    font-size: 0.75rem;
    background: var(--color-border);
    padding: 0.125rem 0.5rem;
    border-radius: 10px;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
}

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

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: inherit;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.4);
    color: white;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-primary);
    color: var(--color-text);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

/* ============================================
   Cards
   ============================================ */
.card {
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition);
}

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

.card-image {
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--color-bg-tertiary);
}

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

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

.card-body {
    padding: 1.5rem;
}

.card-category {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-primary-light);
    margin-bottom: 0.5rem;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.card-title a {
    color: var(--color-text);
}

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

.card-excerpt {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.card-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--color-text-dim);
}

.card-meta span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* ============================================
   Post Grid
   ============================================ */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.5rem;
}

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

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

.posts-grid.featured .card-image {
    aspect-ratio: auto;
    min-height: 300px;
}

.posts-grid.featured .card-body {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 2rem;
}

.posts-grid.featured .card-title {
    font-size: 1.75rem;
}

/* ============================================
   Section Headers
   ============================================ */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--color-border);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
}

/* ============================================
   Page Content
   ============================================ */
.page-header {
    text-align: center;
    padding: 3rem 0;
    margin-bottom: 2rem;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   Article / Post Single
   ============================================ */
.article {
    max-width: 800px;
    margin: 0 auto;
}

.article-header {
    margin-bottom: 2rem;
}

.article-category {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-primary-light);
    margin-bottom: 1rem;
    padding: 0.25rem 0.75rem;
    background: rgba(59, 130, 246, 0.1);
    border-radius: var(--radius-sm);
}

.article-title {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.article-featured-image {
    margin-bottom: 2rem;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.article-featured-image img {
    width: 100%;
    height: auto;
}

.article-content {
    font-size: 1.0625rem;
    line-height: 1.8;
}

.article-content h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin: 2.5rem 0 1rem;
    color: var(--color-text);
}

.article-content h3 {
    font-size: 1.375rem;
    font-weight: 600;
    margin: 2rem 0 0.75rem;
}

.article-content p {
    margin-bottom: 1.25rem;
}

.article-content ul,
.article-content ol {
    margin: 1rem 0 1.5rem 1.5rem;
}

.article-content li {
    margin-bottom: 0.5rem;
}

.article-content code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--color-bg-secondary);
    padding: 0.2em 0.4em;
    border-radius: var(--radius-sm);
    color: var(--color-accent);
}

.article-content pre {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin: 1.5rem 0;
    overflow-x: auto;
}

.article-content pre code {
    background: none;
    padding: 0;
    font-size: 0.875rem;
    color: var(--color-text);
}

.article-content blockquote {
    border-left: 3px solid var(--color-primary);
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    color: var(--color-text-muted);
    font-style: italic;
}

.article-content a {
    border-bottom: 1px solid var(--color-primary);
}

.article-content img {
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
}

/* Callout boxes */
.callout {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
    border-left: 4px solid;
}

.callout-info {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--color-primary);
}

.callout-tip {
    background: rgba(234, 179, 8, 0.1);
    border-color: #eab308;
}

.callout-warning {
    background: rgba(249, 115, 22, 0.1);
    border-color: #f97316;
}

.callout-success {
    background: rgba(34, 197, 94, 0.1);
    border-color: #22c55e;
}

.callout-title {
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.callout-info .callout-title { color: var(--color-primary-light); }
.callout-tip .callout-title { color: #eab308; }
.callout-warning .callout-title { color: #f97316; }
.callout-success .callout-title { color: #22c55e; }

.callout p:last-child { margin-bottom: 0; }

/* ============================================
   Projects
   ============================================ */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.project-card {
    display: flex;
    flex-direction: column;
}

.project-card .card-body {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-technologies {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: auto;
    padding-top: 1rem;
}

.tech-tag {
    font-size: 0.7rem;
    font-weight: 500;
    padding: 0.25rem 0.5rem;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
}

.project-links {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
}

/* ============================================
   Static Page
   ============================================ */
.static-page {
    max-width: 800px;
    margin: 0 auto;
}

.static-page .page-content {
    font-size: 1.0625rem;
    line-height: 1.8;
}

.static-page .page-content h2 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
}

.static-page .page-content h3 {
    font-size: 1.25rem;
    margin: 1.5rem 0 0.75rem;
}

.static-page .page-content p {
    margin-bottom: 1rem;
    color: var(--color-text-muted);
}

/* ============================================
   Category Page
   ============================================ */
.category-header {
    text-align: center;
    padding: 2rem 0 3rem;
}

.category-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-primary-light);
    margin-bottom: 1rem;
}

/* ============================================
   Error Page
   ============================================ */
.error-page {
    text-align: center;
    padding: 4rem 0;
}

.error-page h1 {
    font-size: 6rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 1rem;
}

.error-page h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.error-page p {
    color: var(--color-text-muted);
    margin-bottom: 2rem;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 3rem 0 1.5rem;
    margin-top: 4rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-brand .logo .site-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.footer-brand p {
    color: var(--color-text-muted);
    margin-top: 0.5rem;
    font-size: 0.9rem;
}

.footer-desc {
    margin-top: 1rem !important;
}

.footer-links h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-text);
}

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

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

.footer-links a {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

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

.footer-bottom {
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--color-text-dim);
}

/* ============================================
   Pagination
   ============================================ */
.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 3rem;
}

.pagination a,
.pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 0.75rem;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    transition: all var(--transition);
}

.pagination a:hover {
    border-color: var(--color-primary);
    color: var(--color-text);
}

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

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 992px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .posts-grid.featured .card {
        grid-template-columns: 1fr;
    }
    
    .posts-grid.featured .card-image {
        min-height: 250px;
    }
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }
    
    .main-nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        padding: 1rem;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition);
    }
    
    .main-nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .main-nav > a,
    .nav-dropdown-toggle {
        width: 100%;
        justify-content: flex-start;
        padding: 0.75rem 1rem;
    }
    
    .nav-dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        background: transparent;
        border: none;
        box-shadow: none;
        padding-left: 1rem;
    }
    
    .posts-grid {
        grid-template-columns: 1fr;
    }
    
    .article-title {
        font-size: 1.75rem;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}