/* ==========================================================================
   CSS Variables (Custom Properties)
   ========================================================================== */
:root {
    /* Colors */
    --color-primary: #ff6b35;
    --color-primary-hover: #e55a2b;
    --color-dark: #1a1a1a;
    --color-dark-secondary: #0d0d0d;
    --color-gray: #333;
    --color-gray-light: #666;
    --color-gray-lighter: #999;
    --color-gray-lightest: #ccc;
    --color-text: #2d2d2d;
    --color-text-secondary: #666666;
    --color-text-light: #fff;
    --color-background: #f8f6f1;
    --color-border: #ddd;
    --color-error: #ff4444;
    --color-success: #28a745;
    --color-surface: #ffffff;
    --color-surface-alt: #f8f9fa;
    
    /* Typography */
    --font-family-primary: 'Georgia', 'Times New Roman', serif;
    --font-family-secondary: 'Courier New', monospace;
    --font-size-small: 0.75rem;
    --font-size-base: 0.9rem;
    --font-size-medium: 1.2rem;
    --font-size-large: 1.3rem;
    --font-size-xl: 1.5rem;
    --font-size-xxl: 1.8rem;
    --font-weight-normal: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-black: 900;
    --line-height-base: 1.7;
    --line-height-tight: 1.6;
    
    /* Spacing */
    --spacing-xs: 0.3rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 0.8rem;
    --spacing-base: 1rem;
    --spacing-lg: 1.2rem;
    --spacing-xl: 1.5rem;
    --spacing-xxl: 1.8rem;
    --spacing-2xl: 2rem;
    --spacing-3xl: 2.5rem;
    --spacing-4xl: 3rem;
    
    /* Layout */
    --container-max-width: 1400px;
    --sidebar-width: 320px;
    --border-radius: 4px;
    --border-radius-lg: 8px;
    --border-width: 1px;
    --border-width-thick: 4px;
    
    /* Z-index */
    --z-index-base: 2;
    --z-index-popup: 1000;
    
    /* Transitions */
    --transition-base: all 0.2s ease;
    --transition-speed: 0.2s ease;
    --left-ad-width: 150px;
}

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

body {
    font-family: var(--font-family-primary);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background: var(--color-background);
    overflow-x: hidden;
}

/* ==========================================================================
   Header and Navigation - Redesigned
   ========================================================================== */
.header {
    background: var(--color-dark);
    padding: 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: var(--border-width-thick) solid var(--color-primary);
    color: var(--color-text-light);
    transition: transform var(--transition-speed);
}

.header.nav-hidden {
    transform: translateY(-100%);
}

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

/* Top row: Logo + Main Nav + Timebar */
.nav-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-2xl);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.nav-main {
    display: flex;
    align-items: center;
    gap: var(--spacing-2xl);
}

.logo {
    font-family: var(--font-family-secondary);
    font-size: var(--font-size-xxl);
    font-weight: var(--font-weight-black);
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    text-decoration: none;
    white-space: nowrap;
}

.nav-menu {
    display: flex;
    gap: 0;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-menu li {
    position: relative;
}

.nav-menu a {
    color: var(--color-text-light);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    display: block;
    font-weight: var(--font-weight-normal);
    text-transform: uppercase;
    font-size: var(--font-size-base);
    letter-spacing: 0.05em;
    transition: var(--transition-base);
    border-radius: var(--border-radius);
    position: relative;
}

.nav-menu a:hover {
    background: rgba(255,255,255,0.1);
    color: var(--color-primary);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-menu a:hover::after {
    width: 80%;
}

/* Timebar - Compact and right-aligned */
.timebar {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-light);
    font-family: var(--font-family-secondary);
    font-size: 0.7rem;
    opacity: 0.8;
    white-space: nowrap;
}

.timebar .time-item {
    padding: 2px 6px;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.15);
    background: rgba(255,255,255,0.05);
    font-weight: var(--font-weight-semibold);
}

/* Bottom row: Search + Social + Theme */
.nav-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-2xl);
    gap: var(--spacing-lg);
}

.search-area {
    background: rgba(255,255,255,0.1);
    padding: var(--spacing-xs) var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 1px solid rgba(255,255,255,0.2);
    flex: 1;
    max-width: 300px;
}

.search-input {
    background: transparent;
    border: none;
    color: var(--color-text-light);
    font-size: var(--font-size-base);
    width: 100%;
    outline: none;
    padding: var(--spacing-xs);
}

.search-input::placeholder {
    color: rgba(255,255,255,0.6);
}

/* Social links - Smaller and refined */
.social-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin: 0;
}

.social-links a {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    text-decoration: none;
    color: var(--color-text-light);
    border: 1px solid rgba(255,255,255,0.2);
    background: rgba(255,255,255,0.05);
    transition: var(--transition-base);
}

.social-links a i {
    font-size: 0.7rem;
}

.social-links a:hover {
    background: var(--color-primary);
    color: var(--color-dark);
    border-color: transparent;
    transform: translateY(-1px);
}

/* Theme toggle - Refined */
.theme-toggle.btn {
    background: rgba(255,255,255,0.1);
    color: var(--color-text-light);
    border: 1px solid rgba(255,255,255,0.2);
    padding: var(--spacing-sm);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    font-size: 1rem;
}

.theme-toggle.btn:hover {
    background: rgba(255,255,255,0.2);
    border-color: rgba(255,255,255,0.3);
}

/* Responsive adjustments */
@media (max-width: 1024px) {
    .nav-top, .nav-bottom {
        padding: var(--spacing-md) var(--spacing-xl);
    }
    
    .nav-main {
        gap: var(--spacing-xl);
    }
    
    .nav-menu a {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-base);
    }
    
    .timebar {
        font-size: 0.65rem;
    }
    
    .timebar .time-item {
        padding: 1px 4px;
    }
    
    .main-container {
        margin-top: 130px; /* Slightly smaller header on tablets */
    }
}

@media (max-width: 768px) {
    .nav-top {
        padding: var(--spacing-sm) var(--spacing-lg);
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .nav-bottom {
        padding: var(--spacing-xs) var(--spacing-lg);
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
    
    .nav-menu {
        order: 3;
        width: 100%;
        justify-content: center;
    }
    
    .nav-menu a {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-small);
    }
    
    .search-area {
        order: 1;
        max-width: 200px;
    }
    
    .timebar {
        display: none;
    }
    
    .social-links a {
        width: 22px;
        height: 22px;
    }
    
    .social-links a i {
        font-size: 0.65rem;
    }
    
    .theme-toggle.btn {
        width: 28px;
        height: 28px;
        font-size: 0.9rem;
    }
    
    .main-container {
        margin-top: 120px; /* Compact header on mobile */
    }
}

/* ==========================================================================
   Main Layout
   ========================================================================== */
.main-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    margin-top: 140px; /* Account for fixed header height (nav-top + nav-bottom + content) */
    display: grid;
    grid-template-columns: var(--left-ad-width) 1fr var(--sidebar-width);
    gap: 0;
    min-height: 80vh;
    padding: var(--spacing-2xl);
}

/* ==========================================================================
   Content Area
   ========================================================================== */
.content {
    grid-column: 2;
    padding: 0 var(--spacing-2xl);
    border-right: var(--border-width) solid var(--color-border);
    min-height: 500px;
    max-width: 100%;
}

.page-title {
    font-size: var(--font-size-xxl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
}

.page-subtitle {
    font-size: var(--font-size-large);
    color: var(--color-gray-light);
    margin-bottom: var(--spacing-2xl);
    font-weight: var(--font-weight-normal);
}

.content-banner {
    background: var(--color-surface);
    color: var(--color-text);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    position: relative;
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.content-banner::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-primary);
    border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
}

.banner-content h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.banner-content p {
    margin-bottom: 0;
    color: var(--color-gray-light);
    font-size: var(--font-size-base);
    line-height: 1.6;
}

/* ==========================================================================
   Side Ad Panel
   ========================================================================== */
#side-ad-container {
    grid-row: 1 / span 2;
    grid-column: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-right: var(--spacing-2xl);
    margin-top: 0;
}

/* ==========================================================================
   Sidebar
   ========================================================================== */
.sidebar {
    grid-column: 3;
    background: var(--color-surface);
    padding: var(--spacing-2xl);
    color: var(--color-text);
    border-radius: var(--border-radius-lg);
    height: fit-content;
    z-index: var(--z-index-base);
    box-shadow: var(--shadow-elev);
    overflow: hidden;
    word-wrap: break-word;
}

.sidebar-section {
    margin-bottom: var(--spacing-2xl);
}

.sidebar-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 2px solid var(--color-primary);
    padding-bottom: var(--spacing-sm);
}

/* ==========================================================================
   Promotional Elements
   ========================================================================== */
.promo-box {
    background: var(--color-surface);
    color: var(--color-text);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
    position: relative;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.promo-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-primary);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.promo-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    color: var(--color-primary);
}

.promo-text {
    font-size: var(--font-size-small);
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

.promo-link {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-primary);
    text-decoration: none;
    cursor: pointer;
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    font-size: var(--font-size-small);
    letter-spacing: 0.05em;
    transition: var(--transition-base);
    background: transparent;
    color: var(--color-primary);
}

.promo-link:hover {
    background: var(--color-primary);
    color: var(--color-text-light);
}

/* ==========================================================================
   Recent Posts
   ========================================================================== */
.recent-list {
    list-style: none;
    padding: 0;
}

.recent-list li {
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm) 0;
    margin-bottom: var(--spacing-sm);
}

.recent-list li:last-child {
    border-bottom: none;
}

.recent-list a {
    color: var(--color-text);
    text-decoration: none;
    font-weight: var(--font-weight-normal);
    font-size: var(--font-size-small);
    transition: var(--transition-base);
    display: block;
    line-height: 1.4;
}

.recent-list a:hover {
    color: var(--color-primary);
    transform: translateX(4px);
}

.recent-date {
    font-family: var(--font-family-secondary);
    font-size: 0.7rem;
    color: var(--color-gray-light);
    margin-top: var(--spacing-xs);
    opacity: 0.8;
}

/* ==========================================================================
   Categories/Topics
   ========================================================================== */
.category-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
    width: 100%;
    max-width: 100%;
}

.sidebar .category-grid {
    margin: 0;
    padding: 0;
}

.category-item {
    background: var(--color-surface-alt);
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: center;
    color: var(--color-text);
    text-decoration: none;
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.02em;
    transition: var(--transition-base);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    cursor: pointer;
    z-index: var(--z-index-base);
    min-height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    box-sizing: border-box;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.category-item:hover {
    background: var(--color-primary);
    color: var(--color-text-light);
    border-color: var(--color-primary);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.category-item.active {
    background: var(--color-primary);
    color: var(--color-text-light);
    border-color: var(--color-primary);
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

/* ==========================================================================
   About Section
   ========================================================================== */
.about-text {
    font-size: var(--font-size-small);
    line-height: var(--line-height-tight);
    color: var(--color-gray-light);
    text-align: justify;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    background: var(--color-dark-secondary);
    color: var(--color-gray-light);
    text-align: center;
    padding: var(--spacing-2xl);
    font-size: var(--font-size-base);
    margin-top: var(--spacing-2xl);
}

/* ==========================================================================
   Advertisement Styles
   ========================================================================== */
.banner-ad {
    width: 100%;
    max-width: 728px;
    height: 90px;
    margin: 20px auto;
    display: block;
    object-fit: cover;
    border: var(--border-width) solid var(--color-border);
}

.side-ad {
    width: 100%;
    max-width: 300px;
    height: 250px;
    margin: 20px 0;
    display: block;
    object-fit: cover;
    border: var(--border-width) solid var(--color-border);
}

/* ==========================================================================
   Popup Advertisement
   ========================================================================== */
.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: var(--z-index-popup);
}

.popup-ad {
    position: relative;
    max-width: 500px;
    max-height: 400px;
    border: 2px solid var(--color-text-light);
    border-radius: var(--border-radius-lg);
}

.popup-close {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--color-error);
    color: var(--color-text-light);
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    cursor: pointer;
    font-size: 18px;
    font-weight: var(--font-weight-bold);
    z-index: 10;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */
.article,
.article-list,
.sidebar {
    display: block !important;
    visibility: visible !important;
}

.category-item {
    display: inline-block !important;
    visibility: visible !important;
}

.content {
    z-index: var(--z-index-base);
}

/* ==========================================================================
   Content Sections
   ========================================================================== */
.section-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-primary);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 60px;
    height: 2px;
    background: var(--color-primary);
}

.topics-section {
    margin-bottom: var(--spacing-3xl);
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.articles-section {
    margin-bottom: var(--spacing-3xl);
}

/* ==========================================================================
   No Articles Message
   ========================================================================== */
.no-articles {
    text-align: center;
    padding: var(--spacing-3xl);
    background: var(--color-surface);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
}

.no-articles h3 {
    color: var(--color-gray-light);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-large);
}

.no-articles p {
    color: var(--color-gray-light);
    font-size: var(--font-size-base);
    line-height: 1.6;
}

/* ==========================================================================
   Popular Topics in Sidebar
   ========================================================================== */
#popular-topics .category-item {
    font-size: 0.65rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    min-height: 28px;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 1024px) {
    .main-container {
        grid-template-columns: 1fr;
    }
    .content, .sidebar, #side-ad-container {
        grid-column: 1;
    }
    #side-ad-container {
        align-items: center;
        margin-right: 0;
        margin-bottom: var(--spacing-2xl);
    }

    .content {
        border-right: none;
        border-bottom: var(--border-width) solid var(--color-border);
        padding: var(--spacing-2xl) var(--spacing-xl);
    }

    .sidebar {
        padding: var(--spacing-2xl);
    }

    .nav-container {
        flex-direction: column;
        gap: var(--spacing-base);
    }

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

    .page-title {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    .content {
        padding: var(--spacing-2xl) var(--spacing-xl);
    }

    .article:hover {
        margin: 0 calc(-1 * var(--spacing-xl));
        padding-left: var(--spacing-xl);
        padding-right: var(--spacing-xl);
    }

    .nav-menu a {
        padding: var(--spacing-md) var(--spacing-base);
        font-size: var(--font-size-base);
        border-right: none;
        border-bottom: var(--border-width) solid var(--color-gray);
    }

    .search-area {
        width: 100%;
    }

    .search-input {
        width: 100%;
    }

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

    .category-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
    }
    
    .category-item {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.65rem;
    }
}

/* Neutral aliases for ad-related classes/ids to avoid blockers */
/* Containers */
#media-banner { /* same as banner container */ }
#media-left { /* left column container */ }

/* Banner/Side media image styles (mirror existing) */
.media-banner-img,
.banner-ad {
    width: 100%;
    max-width: 728px;
    height: 90px;
    margin: 20px auto;
    display: block;
    object-fit: cover;
    border: var(--border-width) solid var(--color-border);
}

.media-left-img,
.side-ad {
    width: 100%;
    max-width: 150px;
    height: 250px;
    margin: 20px 0;
    display: block;
    object-fit: cover;
    border: var(--border-width) solid var(--color-border);
}

/* Overlay aliases */
.overlay { /* replaces .popup-overlay */
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: var(--z-index-popup);
}

.overlay-media, /* replaces .popup-ad */
.popup-ad {
    position: relative;
    max-width: 500px;
    max-height: 400px;
    border: 2px solid var(--color-text-light);
    border-radius: var(--border-radius-lg);
}

.overlay-close, /* replaces .popup-close */
.popup-close {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--color-error);
    color: var(--color-text-light);
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    cursor: pointer;
    font-size: 18px;
    font-weight: var(--font-weight-bold);
    z-index: 10;
}

/* Support both old and new left container ids in grid placement */
#media-left,
#side-ad-container {
    grid-column: 1;
}

/* ==========================================================================
   Theme Support
   ========================================================================== */
:root[data-theme="light"] {
    --color-background: #f8f6f1;
    --color-text: #2d2d2d;
    --color-text-secondary: #666666;
    --color-surface: #ffffff;
    --color-surface-alt: #faf9f6;
    --shadow-elev: 0 6px 20px rgba(0,0,0,0.08);
    --shadow-elev-hover: 0 8px 25px rgba(0,0,0,0.15);
    --color-header-bg: rgba(26,26,26,0.98);
}

:root[data-theme="dark"] {
    --color-background: #111111;
    --color-text: #e8e8e8;
    --color-text-secondary: #b0b0b0;
    --color-surface: #1a1a1a;
    --color-surface-alt: #151515;
    --shadow-elev: 0 6px 20px rgba(0,0,0,0.5);
    --shadow-elev-hover: 0 8px 25px rgba(0,0,0,0.6);
    --color-header-bg: rgba(10,10,10,0.98);
    --color-border: #2a2a2a;
    --color-gray: #444;
    --color-gray-light: #aaa;
    --color-gray-lighter: #bbb;
    --color-gray-lightest: #ddd;
}

/* Ensure body picks theme colors */
body {
    background: var(--color-background);
    color: var(--color-text);
}

/* Sticky header with subtle shadow */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-header-bg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.25);
}

/* Navigation extras */
.page-subtitle {
    color: var(--color-gray-light);
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-2xl);
}

.theme-toggle.btn {
    background: transparent;
    color: var(--color-text-light);
    border: var(--border-width) solid transparent;
}
.theme-toggle.btn:hover {
    background: rgba(255,255,255,0.08);
    border-color: rgba(255,255,255,0.12);
}

/* Article Cards */
.article-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
}

.article {
    background: var(--color-surface);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-elev);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border: 1px solid var(--color-border);
}

.article:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.article-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.article-title a {
    color: inherit;
    text-decoration: none;
}

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

.article-meta {
    display: flex;
    gap: var(--spacing-xl);
    color: var(--color-gray-light);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-small);
    font-family: var(--font-family-secondary);
}

.article-excerpt {
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.article-tags {
    margin-bottom: var(--spacing-lg);
}

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

.tag {
    display: inline-block;
    background: var(--color-surface-alt);
    color: var(--color-text);
    border: var(--border-width) solid var(--color-border);
    border-radius: 999px;
    padding: 0.1rem 0.6rem;
    margin-right: 0.4rem;
    margin-top: 0.4rem;
    font-size: var(--font-size-small);
}

/* Skeleton loaders */
.skeleton {
    background: var(--color-surface);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-elev);
    overflow: hidden;
    position: relative;
}
.skeleton .skeleton-line {
    height: 12px;
    background: var(--color-surface-alt);
    border-radius: 6px;
    margin-bottom: 12px;
}
.skeleton .skeleton-line.lg { height: 18px; width: 80%; }
.skeleton .skeleton-line.md { height: 14px; width: 60%; }
.skeleton .skeleton-line.sm { height: 10px; width: 40%; }

.skeleton::after {
    content: '';
    position: absolute;
    top: 0; left: -150px; bottom: 0;
    width: 150px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    animation: shimmer 1.6s infinite;
}

@keyframes shimmer { 0% { transform: translateX(0); } 100% { transform: translateX(600px); } }

/* Reading progress bar */
#progress-bar {
    position: fixed;
    top: 0; left: 0;
    height: 4px;
    width: 0;
    background: var(--color-primary);
    z-index: 200;
}

/* Back to top button */
.back-to-top {
    position: fixed;
    right: 20px;
    bottom: 20px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: none;
    background: var(--color-primary);
    color: var(--color-dark);
    box-shadow: var(--shadow-elev);
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    transition: transform 0.2s ease, opacity 0.2s ease;
    z-index: 150;
}
.back-to-top:hover { transform: translateY(-2px); }
.back-to-top.show { display: flex; opacity: 1; }

/* Sidebar surface background */
.sidebar {
    background: var(--color-surface);
}

/* Promo boxes surface */
.promo-box {
    background: var(--color-surface);
    box-shadow: var(--shadow-elev);
}

/* Timebar in navbar */
.timebar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 0.75rem;
    color: var(--color-text-light);
    font-family: var(--font-family-secondary);
    font-size: 0.8rem;
    opacity: 0.9;
}
.timebar .time-item {
    padding: 4px 8px;
    border-radius: 999px;
    border: var(--border-width) solid rgba(255,255,255,0.2);
    background: transparent;
}
@media (max-width: 768px) {
    .timebar { display: none; }
}

/* ==========================================================================
   Banner Advertisement
   ========================================================================== */
.banner-ad-container {
    margin: var(--spacing-2xl) 0;
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-elev);
}

.banner-ad-container img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-base);
    text-align: center;
    line-height: 1.4;
}

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

.btn-primary:hover {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.3);
}

.read-more-btn {
    background: var(--color-primary);
    color: var(--color-text-light);
    border: 1px solid var(--color-primary);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: var(--transition-base);
}

.read-more-btn:hover {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.3);
}

/* ==========================================================================
   Website Introduction Section
   ========================================================================== */
.website-intro {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-3xl);
    text-align: center;
}

.intro-title {
    font-size: 2rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
    font-weight: 600;
}

.intro-text {
    font-size: var(--font-size-large);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.6;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.intro-actions {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

/* ==========================================================================
   Tools Page Styles
   ========================================================================== */
.tools-intro {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    text-align: center;
}

.tools-intro p {
    font-size: var(--font-size-large);
    color: var(--color-text-secondary);
    margin: 0;
    line-height: 1.6;
}

.tools-filter {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
    justify-content: center;
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-speed);
    font-size: var(--font-size-small);
}

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

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

.tools-grid {
    display: grid;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-3xl);
}

.tool-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-speed);
    box-shadow: var(--shadow-elev);
}

.tool-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-elev-hover);
    border-color: var(--color-primary);
}

.tool-header {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    align-items: flex-start;
}

.tool-image {
    width: 60px;
    height: 60px;
    object-fit: contain;
    border-radius: var(--border-radius);
    flex-shrink: 0;
}

.tool-info {
    flex: 1;
}

.tool-name {
    margin: 0 0 var(--spacing-sm) 0;
    font-size: 1.25rem;
}

.tool-name a {
    color: var(--color-text);
    text-decoration: none;
    transition: color var(--transition-speed);
}

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

.tool-meta {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    flex-wrap: wrap;
}

.tool-category {
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-small);
    font-weight: 500;
}

.tool-price {
    background: var(--color-success);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-small);
    font-weight: 500;
}

.tool-content {
    margin-bottom: var(--spacing-lg);
}

.tool-description {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.tool-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
}

.tool-tag {
    background: var(--color-gray-light);
    color: var(--color-text);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-small);
    border: 1px solid var(--color-border);
}

.tool-usage {
    background: var(--color-surface-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    font-size: var(--font-size-small);
    line-height: 1.5;
}

.tool-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.tools-loading {
    text-align: center;
    padding: var(--spacing-3xl);
    color: var(--color-text-secondary);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top: 3px solid var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-lg);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.tools-empty {
    text-align: center;
    padding: var(--spacing-3xl);
    color: var(--color-text-secondary);
}

.tools-empty h3 {
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

/* Category List in Sidebar */
.category-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.category-list .category-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: background-color var(--transition-speed);
}

.category-list .category-item:hover {
    background: var(--color-surface-alt);
}

.category-list .category-item i {
    color: var(--color-primary);
    width: 20px;
    text-align: center;
}

/* Updates List */
.updates-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.update-item {
    padding: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
}

.update-item:last-child {
    border-bottom: none;
}

.update-title {
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.update-date {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
}

/* Responsive adjustments for tools */
@media (max-width: 768px) {
    .intro-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .tools-filter {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: var(--spacing-sm);
    }
    
    .filter-btn {
        white-space: nowrap;
        flex-shrink: 0;
    }
    
    .tool-header {
        flex-direction: column;
        text-align: center;
    }
    
    .tool-image {
        align-self: center;
    }
    
    .tool-actions {
        justify-content: center;
    }
    
    .tool-meta {
        justify-content: center;
    }
}