/* 
  Lumina Blog Prototype - Premium Modern Blog Styling
  Built for high performance and Blogger Template compatibility.
*/

:root {
    /* Light Theme Palette */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-accent: #f0f2f5;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #6b7280;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --border-color: #e5e7eb;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --card-shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.3);
    
    /* Spacing System */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    
    /* Typography Scale */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-serif: 'Georgia', serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --h1: clamp(2.5rem, 5vw, 4rem);
    --h2: clamp(2rem, 4vw, 3rem);
    --h3: clamp(1.5rem, 3vw, 2.25rem);
    --body: clamp(1rem, 1.1vw, 1.125rem);
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-accent: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-color: #60a5fa;
    --accent-hover: #3b82f6;
    --border-color: #1e293b;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --card-shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --glass-bg: rgba(15, 23, 42, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 100%;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

/* Layout Utilities */
.container {
    width: 100%;
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 var(--space-sm);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--space-md);
    }
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.grid { display: grid; }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

/* Typography */
h1, h2, h3, h4 {
    line-height: 1.2;
    margin-bottom: var(--space-sm);
    font-weight: 800;
    letter-spacing: -0.025em;
}

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

/* Header & Navigation */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--glass-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    height: 70px;
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.navbar.scrolled {
    height: 60px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--accent-color);
    letter-spacing: -1px;
}

.nav-links {
    display: none;
    gap: var(--space-lg);
}

@media (min-width: 768px) {
    .nav-links {
        display: flex;
    }
}

.nav-links a {
    font-weight: 500;
    color: var(--text-secondary);
}

.nav-links a:hover, .nav-links a.active {
    color: var(--accent-color);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

@media (min-width: 768px) {
    .nav-actions {
        gap: var(--space-sm);
    }
}

.theme-toggle, .search-toggle, .mobile-menu-toggle {
    padding: var(--space-xs);
    border-radius: 50%;
    color: var(--text-secondary);
    transition: var(--transition);
}

.theme-toggle:hover, .search-toggle:hover {
    background-color: var(--bg-accent);
    color: var(--accent-color);
}

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

@media (min-width: 768px) {
    .mobile-menu-toggle {
        display: none;
    }
}

/* Hero Section - 3 Editor's Picks */
.hero {
    padding: var(--space-xl) 0;
    background-color: var(--bg-primary);
}

.hero-featured-grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: var(--space-md);
}

@media (min-width: 768px) {
    .hero-featured-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.featured-card {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    aspect-ratio: 4/5;
    background-color: var(--bg-secondary);
    transition: var(--transition);
}

.featured-card:hover {
    transform: translateY(-5px);
}

.featured-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s ease;
}

.featured-card:hover img {
    transform: scale(1.1);
}

.featured-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: var(--space-lg) var(--space-md);
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
    color: white;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.featured-overlay .category-badge {
    position: static;
    margin-bottom: 10px;
    width: fit-content;
}

.featured-overlay h2 {
    font-size: 1.25rem;
    line-height: 1.3;
    margin-bottom: 0px;
    color: white;
}

.featured-meta {
    font-size: 0.75rem;
    opacity: 0.9;
    margin-top: 8px;
    display: flex;
    gap: 10px;
    font-weight: 500;
}

/* Top Stories Section - Horizontal Pattern */
.top-stories {
    margin-bottom: var(--space-xl);
}

.top-story-big {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    background-color: var(--bg-primary);
    border-radius: 20px;
    overflow: hidden;
    margin-bottom: var(--space-lg);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.top-story-big:hover {
    box-shadow: var(--card-shadow-hover);
    transform: translateY(-2px);
}

@media (min-width: 768px) {
    .top-story-big {
        flex-direction: row;
        align-items: stretch;
    }
    .top-story-big .story-image {
        flex: 1.2;
        max-width: 50%;
    }
    .top-story-big .story-content {
        flex: 1;
        padding: var(--space-xl);
        display: flex;
        flex-direction: column;
        justify-content: center;
    }
}

.top-story-big .story-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    min-height: 250px;
}

.top-stories-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

@media (min-width: 768px) {
    .top-stories-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.top-story-small {
    display: flex;
    gap: var(--space-md);
    background-color: var(--bg-primary);
    padding: var(--space-sm);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    align-items: center;
    transition: var(--transition);
}

.top-story-small:hover {
    background-color: var(--bg-secondary);
    border-color: var(--accent-color);
}

.top-story-small .story-image {
    width: 120px;
    height: 85px;
    flex-shrink: 0;
    border-radius: 12px;
    overflow: hidden;
}

.top-story-small .story-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.top-story-small .story-content {
    flex: 1;
}

.top-story-small .story-content h4 {
    font-size: 1rem;
    margin-bottom: 4px;
    line-height: 1.3;
    font-weight: 700;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.top-story-small .meta-info {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
}

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

/* Blog Feed */
.blog-listing {
    padding: var(--space-xl) 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: var(--space-xl);
}

.grid-listings {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
}

.post-horizontal {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    background-color: var(--bg-primary);
    border-radius: 20px;
    overflow: hidden;
    transition: var(--transition);
}

@media (min-width: 640px) {
    .post-horizontal {
        flex-direction: row;
        align-items: flex-start;
    }
    .post-horizontal .card-image-wrap {
        width: 280px;
        height: 180px;
        flex-shrink: 0;
        border-radius: 16px;
    }
}

.post-horizontal .card-content {
    padding: 0 0 15px;
}

@media (min-width: 640px) {
    .post-horizontal .card-content {
        padding: 10px 0;
    }
}

.post-horizontal .category-label {
    text-transform: uppercase;
    color: var(--accent-color);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
    display: block;
}

.post-horizontal h3 {
    font-size: 1.5rem;
    line-height: 1.25;
    margin-bottom: 0.75rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-horizontal .card-excerpt {
    margin-bottom: 1rem;
    font-size: 0.95rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Blog Card */
.post-card {
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.card-image-wrap {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}

.card-image-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.post-card:hover .card-image-wrap img {
    transform: scale(1.1);
}

.category-badge {
    position: absolute;
    top: 15px;
    left: 15px;
    background-color: var(--accent-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 30px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.card-content {
    padding: var(--space-md);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.card-excerpt {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--space-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-footer {
    padding-top: var(--space-sm);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.author-img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.meta-info {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Search and Newsletter Widgets */
.search-form, .newsletter-form {
    position: relative;
    display: flex;
    align-items: center;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 4px;
    transition: var(--transition);
}

.search-form:focus-within, .newsletter-form:focus-within {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.search-input, .newsletter-input {
    flex: 1;
    border: none;
    background: transparent;
    padding: 8px 12px;
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
}

.search-btn, .newsletter-btn {
    background-color: var(--accent-color);
    color: white;
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.85rem;
    transition: var(--transition);
}

.search-btn:hover, .newsletter-btn:hover {
    background-color: var(--accent-hover);
}

.search-btn {
    padding: 6px 10px;
}

/* Compact Footer */
.footer-compact {
    background-color: var(--bg-secondary);
    padding: var(--space-xl) 0 var(--space-lg);
    border-top: 1px solid var(--border-color);
    margin-top: var(--space-xl);
}

.footer-top {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

@media (min-width: 768px) {
    .footer-top {
        flex-direction: row;
    }
}

.footer-logo-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
}

@media (min-width: 768px) {
    .footer-logo-area {
        flex-direction: row;
        align-items: center;
        gap: var(--space-lg);
    }
}

.footer-about {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 0;
    max-width: 300px;
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-color);
}

@media (min-width: 768px) {
    .footer-bottom {
        flex-direction: row;
    }
}

.footer-links-inline {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
}

@media (min-width: 768px) {
    .footer-links-inline {
        justify-content: flex-end;
    }
}

.footer-links-inline a {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.footer-copyright {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Sidebar & Widgets */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    position: sticky;
    top: 80px;
    align-self: start;
    height: fit-content;
}

.widget {
    background-color: var(--bg-secondary);
    padding: var(--space-lg);
    border-radius: 16px;
    border: 1px solid var(--border-color);
}

.widget-title {
    font-size: 1.1rem;
    margin-bottom: var(--space-md);
    border-bottom: 2px solid var(--accent-color);
    display: inline-block;
    padding-bottom: 5px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Search Overlay */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-primary);
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.search-overlay.active {
    opacity: 1;
    visibility: visible;
}

.search-overlay-content {
    width: 100%;
    max-width: 800px;
    padding: var(--space-xl);
    position: relative;
    text-align: center;
}

.search-close {
    position: absolute;
    top: -60px;
    right: var(--space-md);
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

@media (min-width: 768px) {
    .search-close {
        top: 0;
        right: -80px;
    }
}

.search-close:hover {
    color: var(--accent-color);
    transform: rotate(90deg);
}

.search-label {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-lg);
    color: var(--text-secondary);
}

.search-overlay-form {
    display: flex;
    align-items: center;
    border-bottom: 2px solid var(--border-color);
    padding: var(--space-sm) 0;
    transition: var(--transition);
    position: relative;
    justify-content: center;
}

.search-overlay-form::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: var(--transition);
    transform: translateX(-50%);
}

.search-overlay-form:focus-within::after {
    width: 100%;
}

.search-overlay-input {
    flex: 1;
    background: none;
    border: none;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    outline: none;
    padding: var(--space-xs) 0;
    text-align: center;
}

@media (min-width: 768px) {
    .search-overlay-input {
        font-size: 2rem;
    }
}

.search-overlay-input::placeholder {
    color: var(--text-muted);
}

.search-overlay-submit {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.search-overlay-form:focus-within .search-overlay-submit {
    color: var(--accent-color);
    transform: scale(1.2);
}

.search-overlay-submit:hover {
    color: var(--accent-hover);
}

/* Post Page Specific Styles */
.post-header {
    padding: var(--space-sm) 0 var(--space-md);
    text-align: left;
}

.post-header h1 {
    font-size: clamp(1.6rem, 7vw, 3.5rem);
    line-height: 1.15;
    margin-bottom: var(--space-xs);
    letter-spacing: -0.025em;
}

@media (min-width: 768px) {
    .post-header {
        padding: var(--space-lg) 0 var(--space-xl);
    }
    .post-header h1 {
        font-size: var(--h1);
        line-height: 1.1;
        margin-bottom: var(--space-sm);
    }
}

.post-meta-top {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
    align-items: center;
    gap: 8px 12px;
    margin-bottom: var(--space-sm);
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.8rem;
}

@media (min-width: 768px) {
    .post-meta-top {
        gap: 15px;
        font-size: 1rem;
    }
}

.post-featured-image {
    width: 100%;
    height: auto;
    aspect-ratio: 16/10;
    object-fit: cover;
    border-radius: 12px;
    margin-bottom: var(--space-md);
}

@media (min-width: 768px) {
    .post-featured-image {
        aspect-ratio: 21/9;
        max-height: 500px;
        border-radius: 24px;
        margin-bottom: var(--space-xl);
    }
}

.post-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
}

@media (min-width: 992px) {
    .post-layout {
        grid-template-columns: 2fr 1fr;
        gap: var(--space-xl);
    }
}

.post-content {
    font-size: var(--body);
    color: var(--text-primary);
    line-height: 1.8;
}

.post-content p {
    margin-bottom: 1.5rem;
}

.post-content h2 { 
    margin-top: 2rem; 
    margin-bottom: 1rem;
    font-weight: 800;
}

.post-content h3 { 
    margin-top: 1.5rem; 
    margin-bottom: 1rem;
    font-weight: 800;
}

.post-content img {
    border-radius: 12px;
    margin: 2rem 0;
}

@media (max-width: 640px) {
    .post-content {
        font-size: 0.95rem;
        line-height: 1.6;
    }
    
    .sidebar {
        margin-top: 3rem;
    }

    .widget {
        padding: var(--space-md);
        margin-bottom: var(--space-md);
    }
}

.post-content blockquote {
    border-left: 4px solid var(--accent-color);
    padding: var(--space-md) var(--space-lg);
    background-color: var(--bg-secondary);
    font-style: italic;
    margin: var(--space-lg) 0;
    border-radius: 0 12px 12px 0;
}

.post-content pre {
    background-color: var(--bg-secondary);
    padding: var(--space-md);
    border-radius: 12px;
    overflow-x: auto;
    margin: var(--space-lg) 0;
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.reading-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 4px;
    background-color: var(--accent-color);
    z-index: 1001;
    transition: width 0.1s;
}

/* Related Stories Section (SeoFlex Style) */
.related-stories-section {
    border-top: 1px solid var(--border-color);
    padding-top: var(--space-xl);
}

.related-title {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: var(--space-lg);
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: var(--space-lg);
}

@media (min-width: 640px) {
    .related-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .related-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.related-story-card {
    background-color: var(--bg-primary);
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.related-image {
    width: 100%;
    aspect-ratio: 1.5 / 1;
    overflow: hidden;
    border-radius: 12px;
}

.related-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.related-info {
    padding: var(--space-sm) 0;
}

.related-story-title {
    font-size: 1.1rem;
    font-weight: 700;
    line-height: 1.35;
    margin-bottom: var(--space-xs);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: var(--text-primary);
}

.related-story-title a:hover {
    color: var(--accent-color);
}

.related-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}

.meta-separator {
    opacity: 0.5;
}

.pagination-wrapper {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding-bottom: 3rem;
}

@media (min-width: 768px) {
    .pagination-wrapper {
        justify-content: center;
        padding-bottom: 5rem;
    }
}

/* 404 Page */
.page-404 {
    height: calc(100vh - 150px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.error-code {
    font-size: clamp(6rem, 15vw, 12rem);
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent-color), #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    margin-bottom: var(--space-sm);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* Mobile Navigation Drawer */
.mobile-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background-color: var(--bg-primary);
    z-index: 2000;
    padding: var(--space-xl);
    box-shadow: -10px 0 30px rgba(0,0,0,0.1);
    transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-nav.open {
    right: 0;
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    z-index: 1999;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.overlay.visible {
    opacity: 1;
    visibility: visible;
}

/* Scroll Top Button */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--accent-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 900;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 4px;
}