/* ===================================
   CSS Variables for Theming
   =================================== */
:root {
    /* Light Mode Colors */
    --primary-color: #4f46e5;
    /* Indigo 600 */
    --primary-hover: #4338ca;
    /* Indigo 700 */
    --secondary-color: #10b981;
    /* Emerald 500 */
    --danger-color: #ef4444;
    /* Red 500 */
    --warning-color: #f59e0b;
    /* Amber 500 */

    --bg-color: #f3f4f6;
    /* Gray 100 */
    --bg-secondary: #ffffff;
    /* White */
    --bg-tertiary: #e5e7eb;
    /* Gray 200 */
    --card-bg: #ffffff;

    --text-color: #1f2937;
    /* Gray 800 */
    --text-secondary: #4b5563;
    /* Gray 600 */
    --text-muted: #9ca3af;
    /* Gray 400 */

    --border-color: #e5e7eb;
    /* Gray 200 */
    --input-bg: #ffffff;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    /* Dark Mode Colors */
    --primary-color: #818cf8;
    /* Indigo 400 */
    --primary-hover: #6366f1;
    /* Indigo 500 */
    --secondary-color: #34d399;
    /* Emerald 400 */
    --danger-color: #f87171;
    /* Red 400 */
    --warning-color: #fbbf24;
    /* Amber 400 */

    --bg-color: #111827;
    /* Gray 900 */
    --bg-secondary: #1f2937;
    /* Gray 800 */
    --bg-tertiary: #374151;
    /* Gray 700 */
    --card-bg: #1f2937;

    --text-color: #f9fafb;
    /* Gray 50 */
    --text-secondary: #d1d5db;
    /* Gray 300 */
    --text-muted: #9ca3af;
    /* Gray 400 */

    --border-color: #374151;
    /* Gray 700 */
    --input-bg: #111827;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

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

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

/* ===================================
   Container & Layout
   =================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.main-content {
    min-height: calc(100vh - 200px);
    padding: 20px 0;
}

/* ===================================
   Header & Navigation
   =================================== */
.site-header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.nav-brand h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: var(--transition);
}

.nav-link:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-color);
}

.nav-user {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.theme-toggle {
    background: var(--bg-tertiary);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
}

.theme-toggle:hover {
    transform: scale(1.1);
    background-color: var(--primary-color);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    text-align: center;
    padding: 3rem 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border-radius: 1rem;
    margin-bottom: 3rem;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.search-container {
    max-width: 600px;
    margin: 0 auto;
}

.search-input {
    width: 100%;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    background-color: rgba(255, 255, 255, 0.9);
    color: #111827;
    box-shadow: var(--shadow-lg);
}

.search-input:focus {
    outline: none;
    box-shadow: var(--shadow-xl);
}

/* ===================================
   Articles Grid
   =================================== */
.articles-section {
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--text-color);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.article-card {
    background-color: var(--bg-secondary);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.article-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

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

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

.article-views {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.9rem;
}

.article-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    line-height: 1.4;
}

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

.article-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.meta-item {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.article-snippet {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    flex: 1;
}

.article-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.tag {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 0.25rem;
    font-size: 0.85rem;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-color);
}

.btn-secondary:hover {
    background-color: var(--border-color);
}

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

.btn-danger:hover {
    background-color: #dc2626;
}

.btn-block {
    width: 100%;
    display: block;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* ===================================
   Forms
   =================================== */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group small {
    display: block;
    margin-top: 0.25rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ===================================
   Auth Pages
   =================================== */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
    padding: 2rem 0;
}

.auth-card {
    background-color: var(--bg-secondary);
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 450px;
}

.auth-card h2 {
    text-align: center;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.auth-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-secondary);
}

/* ===================================
   Alerts
   =================================== */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 0.5rem;
    margin-bottom: 1.5rem;
}

.alert-error {
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--danger-color);
    color: var(--danger-color);
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--secondary-color);
    color: var(--secondary-color);
}

.alert-info {
    background-color: rgba(99, 102, 241, 0.1);
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

/* ===================================
   Article Full Page
   =================================== */
.breadcrumbs {
    padding: 1rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.breadcrumbs .separator {
    margin: 0 0.5rem;
}

.article-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 3rem;
    margin-top: 2rem;
}

.article-full {
    background-color: var(--bg-secondary);
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
}

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

.article-header h1 {
    font-size: 2.5rem;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.article-meta-full {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.article-featured-image {
    margin-bottom: 2rem;
    border-radius: 0.5rem;
    overflow: hidden;
}

.article-body {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-color);
}

.article-body h2 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.article-body h3 {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-size: 1.4rem;
}

.article-body p {
    margin-bottom: 1.5rem;
}

.article-body ul,
.article-body ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

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

/* ===================================
   Social Share
   =================================== */
.social-share {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.social-share h3 {
    margin-bottom: 1rem;
}

.share-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.share-btn {
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    color: white;
    font-weight: 500;
    transition: var(--transition);
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.share-btn.twitter {
    background-color: #1da1f2;
}

.share-btn.facebook {
    background-color: #4267B2;
}

.share-btn.linkedin {
    background-color: #0077b5;
}

/* ===================================
   Comments
   =================================== */
.comments-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.comment-form {
    margin-bottom: 2rem;
}

.comments-list {
    margin-top: 2rem;
}

.comment {
    background-color: var(--bg-tertiary);
    padding: 1.5rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
}

.comment-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.comment-date {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.comment-body {
    color: var(--text-secondary);
    line-height: 1.6;
}

.no-comments {
    text-align: center;
    color: var(--text-muted);
    padding: 2rem;
}

.comment-footer {
    margin-top: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

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

.like-btn {
    background: none;
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.delete-comment-btn {
    background: none;
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-size: 0.9rem;
    color: #ef4444;
}

.delete-comment-btn:hover {
    background-color: #fee2e2;
    border-color: #ef4444;
    transform: scale(1.05);
}

.like-btn:hover {
    background-color: var(--bg-secondary);
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.like-btn.liked {
    border-color: #ef4444;
    background-color: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.like-btn .like-icon {
    font-size: 1.2rem;
    transition: var(--transition);
}

.like-btn:hover .like-icon {
    transform: scale(1.2);
}

.like-btn .like-count {
    font-weight: 500;
}

.like-display {
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.like-display .like-count {
    font-weight: 500;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
}

.sidebar-widget h3 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.related-articles,
.popular-articles {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.related-article,
.popular-article {
    padding: 1rem;
    background-color: var(--bg-tertiary);
    border-radius: 0.5rem;
    transition: var(--transition);
    display: block;
}

.related-article:hover,
.popular-article:hover {
    background-color: var(--border-color);
    transform: translateX(5px);
}

.related-article h4 {
    color: var(--text-color);
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.related-article p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.related-meta {
    color: var(--text-muted);
    font-size: 0.85rem;
}

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

.popular-title {
    color: var(--text-color);
    font-size: 0.95rem;
    flex: 1;
}

.popular-views {
    color: var(--text-muted);

    .stat-card {
        background-color: var(--bg-secondary);
        padding: 1.5rem;
        border-radius: 1rem;
        box-shadow: var(--shadow-md);
        display: flex;
        align-items: center;
        gap: 1rem;
    }

    .stat-icon {
        font-size: 2.5rem;
    }

    .stat-value {
        font-size: 2rem;
        font-weight: 700;
        color: var(--text-color);
    }

    .stat-label {
        color: var(--text-secondary);
        font-size: 0.9rem;
    }

    .dashboard-section {
        background-color: var(--bg-secondary);
        padding: 2rem;
        border-radius: 1rem;
        box-shadow: var(--shadow-md);
        margin-bottom: 2rem;
    }

    .section-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 1.5rem;
    }

    .charts-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
        gap: 2rem;
    }

    .chart-container {
        background-color: var(--bg-tertiary);
        padding: 1.5rem;
        border-radius: 0.5rem;
        min-height: 300px;
    }

    .chart-container h3 {
        margin-bottom: 1rem;
        font-size: 1.1rem;
    }

    .chart-container canvas {
        max-height: 250px;
    }

    /* ===================================
   Tables
   =================================== */
    .table-container {
        overflow-x: auto;
    }

    .admin-table {
        width: 100%;
        border-collapse: collapse;
    }

    .admin-table thead {
        background-color: var(--bg-tertiary);
    }

    .admin-table th,
    .admin-table td {
        padding: 1rem;
        text-align: left;
        border-bottom: 1px solid var(--border-color);
    }

    .admin-table th {
        font-weight: 600;
        color: var(--text-color);
    }

    .admin-table td {
        color: var(--text-secondary);
    }

    .admin-table tr:hover {
        background-color: var(--bg-tertiary);
    }

    /* ===================================
   Modal
   =================================== */
    .modal {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.7);
        z-index: 1000;
        align-items: center;
        justify-content: center;
        padding: 2rem;
    }

    .modal-content {
        background-color: var(--bg-color);
        border-radius: 1rem;
        max-width: 800px;
        width: 100%;
        max-height: 90vh;
        overflow-y: auto;
        box-shadow: var(--shadow-xl);
    }

    .modal-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 1.5rem;
        border-bottom: 1px solid var(--border-color);
    }

    .modal-header h2 {
        margin: 0;
    }

    .modal-close {
        background: none;
        border: none;
        font-size: 2rem;
        cursor: pointer;
        color: var(--text-secondary);
        transition: var(--transition);
    }

    .modal-close:hover {
        color: var(--danger-color);
    }

    .modal-content form {
        padding: 1.5rem;
    }

    .modal-footer {
        display: flex;
        justify-content: flex-end;
        gap: 1rem;
        padding: 1.5rem;
        border-top: 1px solid var(--border-color);
    }

    /* ===================================
   Toast Notifications
   =================================== */
    #toast-container {
        position: fixed;
        bottom: 2rem;
        right: 2rem;
        z-index: 2000;
        display: flex;
        flex-direction: column;
        gap: 1rem;
    }

    .toast {
        background-color: var(--bg-secondary);
        color: var(--text-color);
        padding: 1rem 1.5rem;
        border-radius: 0.5rem;
        box-shadow: var(--shadow-xl);
        min-width: 300px;
        animation: slideIn 0.3s ease;
    }

    .toast.success {
        border-left: 4px solid var(--secondary-color);
    }

    .toast.error {
        border-left: 4px solid var(--danger-color);
    }

    @keyframes slideIn {
        from {
            transform: translateX(400px);
            opacity: 0;
        }

        to {
            transform: translateX(0);
            opacity: 1;
        }
    }

    /* ===================================
   Responsive Design
   =================================== */
    @media (max-width: 768px) {
        .navbar {
            flex-direction: column;
            gap: 1rem;
        }

        .nav-menu {
            flex-wrap: wrap;
            justify-content: center;
        }

        .hero-title {
            font-size: 2rem;
        }

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

        .article-layout {
            display: flex;
            flex-direction: column;
        }

        .article-sidebar {
            position: static;
            order: 2;
        }

        .article-full {
            order: 1;
        }

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

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

        .footer-content {
            grid-template-columns: 1fr;
        }

        .modal-content {
            margin: 1rem;
        }

        #toast-container {
            left: 1rem;
            right: 1rem;
        }

        .toast {
            min-width: auto;
        }
    }

    /* ===================================
   Utility Classes
   =================================== */
    .text-center {
        text-align: center;
    }

    .mt-1 {
        margin-top: 0.5rem;
    }

    .mt-2 {
        margin-top: 1rem;
    }

    .mt-3 {
        margin-top: 1.5rem;
    }

    .mt-4 {
        margin-top: 2rem;
    }

    .mb-1 {
        margin-bottom: 0.5rem;
    }

    .mb-2 {
        margin-bottom: 1rem;
    }

    .mb-3 {
        margin-bottom: 1.5rem;
    }

    .mb-4 {
        margin-bottom: 2rem;
    }