/* ===== CSS Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    overscroll-behavior-y: none;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease, --primary 0.3s ease, --primary-dark 0.3s ease, --primary-light 0.3s ease;
}

/* ===== CSS Variables ===== */
:root {
    /* Primary Colors - CÓ THỂ THAY ĐỔI */
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #60a5fa;
    --primary-gradient: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    --primary-gradient-hover: linear-gradient(135deg, #1d4ed8 0%, #2563eb 100%);
    
    /* Accent Colors */
    --accent-seo: #10b981;
    --accent-developer: #3b82f6;
    --accent-image: #8b5cf6;
    --accent-text: #f59e0b;
    --accent-social: #06b6d4;
    --accent-ads: #ec4899;
    --accent-time: #8b5cf6;
    --accent-tienich: #f65c5c;
    
    /* Light Theme Colors */
    --background: #ffffff;
    --surface: #f8fafc;
    --surface-dark: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --border-light: #eef2f7;
    
    /* Dark Theme Colors */
    --background-dark: #0f172a;
    --surface-dark-theme: #1e293b;
    --surface-dark-dark: #334155;
    --text-primary-dark: #f1f5f9;
    --text-secondary-dark: #cbd5e1;
    --text-muted-dark: #94a3b8;
    --border-dark: #334155;
    --border-light-dark: #475569;
    
    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.03);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-md: 0 10px 15px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 20px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 25px 50px rgba(0, 0, 0, 0.12);
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.25rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-index */
    --z-header: 1000;
    --z-category: 999;
    --z-floating: 1001;
    --z-color-picker: 1005;
    --z-cookie: 2000;
    --z-modal: 3000;
}

/* ===== Dark Theme Variables ===== */
body.dark-theme {
    --background: var(--background-dark);
    --surface: var(--surface-dark-theme);
    --surface-dark: var(--surface-dark-dark);
    --text-primary: var(--text-primary-dark);
    --text-secondary: var(--text-secondary-dark);
    --text-muted: var(--text-muted-dark);
    --border: var(--border-dark);
    --border-light: var(--border-light-dark);
}

/* ===== NEW: Theme Color Picker ===== */
.theme-color-picker {
    position: fixed;
    top: 1.25rem;
    right: 1.25rem;
    z-index: var(--z-color-picker);
    font-family: 'Inter', sans-serif;
}

.color-picker-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    z-index: var(--z-color-picker);
    position: relative;
}

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

.color-picker-toggle i {
    font-size: 1rem;
}

.color-picker-label {
    display: none;
}

@media (min-width: 768px) {
    .color-picker-label {
        display: inline;
    }
}

/* Color Panel */
.color-panel {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    width: 280px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: var(--z-color-picker);
    overflow: hidden;
}

.color-panel.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.color-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--border-light);
    background: var(--surface-dark);
}

.color-panel-header h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.close-color-panel {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}

.close-color-panel:hover {
    background: var(--border);
    color: var(--text-primary);
}

/* Color Options Grid */
.color-options-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
    padding: 1rem;
}

.color-option {
    position: relative;
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    overflow: hidden;
    border: 2px solid transparent;
    display: flex;
    align-items: center;
    justify-content: center;
}

.color-option:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow);
}

.color-option.active {
    border-color: var(--text-primary);
    box-shadow: var(--shadow);
}

.color-check {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.2);
    opacity: 0;
    transition: var(--transition);
    font-size: 0.9rem;
}

.color-option.active .color-check {
    opacity: 1;
}

.color-name {
    position: absolute;
    bottom: -1.5rem;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.7rem;
    color: var(--text-secondary);
    white-space: nowrap;
    opacity: 0;
    transition: var(--transition);
    background: var(--surface);
    padding: 0.125rem 0.375rem;
    border-radius: 2px;
    box-shadow: var(--shadow-xs);
    pointer-events: none;
}

.color-option:hover .color-name {
    opacity: 1;
    bottom: -1.75rem;
}

/* Color Panel Footer */
.color-panel-footer {
    padding: 1rem;
    border-top: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    background: var(--surface-dark);
}

.reset-color-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
}

.reset-color-btn:hover {
    background: var(--border-light);
    color: var(--text-primary);
    transform: translateY(-1px);
}

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

/* Mobile adjustments */
@media (max-width: 768px) {
    .theme-color-picker {
        top: 0.75rem;
        right: 0.75rem;
    }
    
    .color-picker-toggle {
        padding: 0.5rem;
        border-radius: 50%;
        width: 40px;
        height: 40px;
        justify-content: center;
    }
    
    .color-picker-toggle i {
        font-size: 1.1rem;
    }
    
    .color-panel {
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, calc(-50% - 20px));
        width: calc(100% - 2rem);
        max-width: 320px;
    }
    
    .color-panel.show {
        transform: translate(-50%, -50%);
    }
}

@media (max-width: 480px) {
    .color-options-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 0.5rem;
    }
    
    .color-option {
        width: 42px;
        height: 42px;
    }
}

/* ===== Layout ===== */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
    width: 100%;
}

/* ===== Custom Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--surface);
    border-radius: var(--radius);
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: var(--radius);
    border: 2px solid var(--surface);
    transition: var(--transition);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* ===== Header ===== */
.main-header {
    background: var(--primary-gradient);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.header-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.brand {
    text-align: center;
    transition: var(--transition);
}

.brand h1 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-size: 1.75rem;
    margin-bottom: 0.25rem;
}

.subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.875rem;
    font-weight: 400;
}

/* Search */
.search-container {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
}

.search-wrapper {
    position: relative;
    width: 100%;
}

#searchInput {
    width: 100%;
    padding: 0.875rem 1.25rem;
    padding-right: 3rem;
    border: none;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.98);
    font-size: 0.95rem;
    color: var(--text-primary);
    box-shadow: var(--shadow);
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

#searchInput:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
    background: white;
}

.clear-btn {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.1);
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.375rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.clear-btn.show {
    opacity: 1;
    visibility: visible;
}

.search-help {
    display: block;
    text-align: center;
    margin-top: 0.5rem;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.8rem;
    opacity: 0.9;
}

/* Quick Stats */
.quick-stats {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.875rem;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-full);
    backdrop-filter: blur(10px);
    font-size: 0.85rem;
    font-weight: 500;
}

/* ===== Main Content ===== */
.main-content {
    padding: 2rem 0;
    min-height: 60vh;
}

/* Ads */
.ads-section {
    margin: 1.5rem 0;
    text-align: center;
    min-height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    overflow: hidden;
}

/* ===== NEW: Category Navigation Design ===== */
.category-section {
    margin: 1.5rem 0;
    position: relative;
}

.category-container {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 1rem;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

/* Category Header */
.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.category-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.category-title i {
    color: var(--primary);
}

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

.stat-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--surface-dark);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
}

/* Category Navigation - Multi-row Grid */
.category-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
    margin-bottom: 1rem;
}

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

@media (max-width: 768px) {
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.625rem;
    }
}

@media (max-width: 480px) {
    .category-grid {
        grid-template-columns: 1fr;
    }
}

/* Category Card */
.category-card {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    padding: 1rem;
    background: white;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
    position: relative;
    overflow: hidden;
    min-height: 80px;
}

.dark-theme .category-card {
    background: var(--surface-dark);
    border-color: var(--border);
}

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

.category-card.active {
    background: var(--primary-gradient);
    border-color: var(--primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.category-card.active:hover {
    background: var(--primary-gradient-hover);
}

/* Category Icon */
.category-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(37, 99, 235, 0.1);
    border-radius: var(--radius);
    font-size: 1.25rem;
    color: var(--primary);
    transition: var(--transition);
    flex-shrink: 0;
}

.dark-theme .category-icon {
    background: rgba(37, 99, 235, 0.15);
}

.category-card:hover .category-icon {
    transform: scale(1.05);
}

.category-card.active .category-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

/* Category Content */
.category-content {
    flex: 1;
    min-width: 0; /* Prevents overflow */
}

.category-name {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.category-description {
    font-size: 0.8rem;
    color: var(--text-muted);
    opacity: 0.9;
}

.category-card.active .category-description {
    color: rgba(255, 255, 255, 0.9);
}

/* Category Count Badge */
.category-count {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background: rgba(0, 0, 0, 0.08);
    color: var(--text-secondary);
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.125rem 0.5rem;
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.dark-theme .category-count {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
}

.category-card.active .category-count {
    background: rgba(255, 255, 255, 0.3);
    color: white;
}

/* Category Filter Chips */
.category-filters {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-light);
}

.filter-chip {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.625rem 1.25rem;
    background: var(--surface-dark);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    flex-shrink: 0;
}

.filter-chip:hover {
    background: var(--border);
    transform: translateY(-1px);
}

.filter-chip.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.filter-chip i {
    font-size: 0.8rem;
}

/* Category Color Coding */
.category-card[data-category="seo"] .category-icon {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-seo);
}

.category-card[data-category="seo"].active .category-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.category-card[data-category="developer"] .category-icon {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-developer);
}

.category-card[data-category="developer"].active .category-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.category-card[data-category="image"] .category-icon {
    background: rgba(139, 92, 246, 0.1);
    color: var(--accent-image);
}

.category-card[data-category="image"].active .category-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.category-card[data-category="text"] .category-icon {
    background: rgba(245, 158, 11, 0.1);
    color: var(--accent-text);
}

.category-card[data-category="text"].active .category-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.category-card[data-category="social"] .category-icon {
    background: rgba(6, 182, 212, 0.1);
    color: var(--accent-social);
}

.category-card[data-category="social"].active .category-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.category-card[data-category="ads"] .category-icon {
    background: rgba(236, 72, 153, 0.1);
    color: var(--accent-ads);
}

.category-card[data-category="ads"].active .category-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.category-card[data-category="time"] .category-icon {
    background: rgba(139, 92, 246, 0.1);
    color: var(--accent-time);
}

.category-card[data-category="time"].active .category-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.category-card[data-category="tienich"] .category-icon {
    background: rgb(248, 123, 129, 0.1);
    color: var(--accent-tienich);
}

.category-card[data-category="tienich"].active .category-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

/* Dark theme adjustments for category colors */
.dark-theme .category-card[data-category="seo"] .category-icon {
    background: rgba(16, 185, 129, 0.15);
}

.dark-theme .category-card[data-category="developer"] .category-icon {
    background: rgba(59, 130, 246, 0.15);
}

.dark-theme .category-card[data-category="image"] .category-icon {
    background: rgba(139, 92, 246, 0.15);
}

.dark-theme .category-card[data-category="text"] .category-icon {
    background: rgba(245, 158, 11, 0.15);
}

.dark-theme .category-card[data-category="social"] .category-icon {
    background: rgba(6, 182, 212, 0.15);
}

.dark-theme .category-card[data-category="ads"] .category-icon {
    background: rgba(236, 72, 153, 0.15);
}

.dark-theme .category-card[data-category="time"] .category-icon {
    background: rgba(139, 92, 246, 0.15);
}

.dark-theme .category-card[data-category="tienich"] .category-icon {
    background: rgb(248 123 129 / 10%);
}

/* Category Active Indicator */
.category-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.category-card.active::after {
    transform: scaleX(1);
}

/* ===== Tools Grid ===== */
.tools-section {
    position: relative;
    margin: 2rem 0;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.25rem;
    margin: 1.5rem 0;
}

.tool-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: var(--transition);
    display: block;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(15px);
    animation: slideUp 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    will-change: transform, opacity;
    cursor: pointer;
    user-select: none;
    height: 100%;
}

.dark-theme .tool-card {
    background: var(--surface-dark);
    border-color: var(--border);
}

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

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary);
    transform: scaleY(0);
    transition: var(--transition);
}

.tool-card:hover::before {
    transform: scaleY(1);
}

.new-badge {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.125rem 0.5rem;
    border-radius: var(--radius-full);
    z-index: 1;
    animation: pulse 2s infinite;
}

.tool-icon {
    width: 48px;
    height: 48px;
    background: var(--surface);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 1rem;
    transition: var(--transition);
}

.dark-theme .tool-icon {
    background: var(--surface-dark);
}

.tool-card:hover .tool-icon {
    transform: scale(1.05) rotate(5deg);
    background: var(--primary-light);
    color: white;
}

.tool-card h3 {
    color: var(--text-primary);
    margin-bottom: 0.625rem;
    font-size: 1.125rem;
    font-weight: 600;
    line-height: 1.4;
    min-height: 2.8rem;
}

.tool-card p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.5;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 4.375rem;
}

.tool-tag {
    display: inline-block;
    padding: 0.25rem 0.625rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: var(--transition);
}

.dark-theme .tool-tag {
    background: var(--surface-dark);
    border-color: var(--border);
}

.tool-card:hover .tool-tag {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.tool-tag[data-tag="seo"] {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-seo);
    border-color: rgba(16, 185, 129, 0.2);
}

.dark-theme .tool-tag[data-tag="seo"] {
    background: rgba(16, 185, 129, 0.15);
    border-color: rgba(16, 185, 129, 0.3);
}

.tool-tag[data-tag="developer"] {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-developer);
    border-color: rgba(59, 130, 246, 0.2);
}

.dark-theme .tool-tag[data-tag="developer"] {
    background: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.3);
}

.tool-tag[data-tag="image"] {
    background: rgba(139, 92, 246, 0.1);
    color: var(--accent-image);
    border-color: rgba(139, 92, 246, 0.2);
}

.dark-theme .tool-tag[data-tag="image"] {
    background: rgba(139, 92, 246, 0.15);
    border-color: rgba(139, 92, 246, 0.3);
}

.tool-tag[data-tag="text"] {
    background: rgba(245, 158, 11, 0.1);
    color: var(--accent-text);
    border-color: rgba(245, 158, 11, 0.2);
}

.dark-theme .tool-tag[data-tag="text"] {
    background: rgba(245, 158, 11, 0.15);
    border-color: rgba(245, 158, 11, 0.3);
}

.tool-tag[data-tag="social"] {
    background: rgba(6, 182, 212, 0.1);
    color: var(--accent-social);
    border-color: rgba(6, 182, 212, 0.2);
}

.dark-theme .tool-tag[data-tag="social"] {
    background: rgba(6, 182, 212, 0.15);
    border-color: rgba(6, 182, 212, 0.3);
}

.tool-tag[data-tag="ads"] {
    background: rgba(236, 72, 153, 0.1);
    color: var(--accent-ads);
    border-color: rgba(236, 72, 153, 0.2);
}

.dark-theme .tool-tag[data-tag="ads"] {
    background: rgba(236, 72, 153, 0.15);
    border-color: rgba(236, 72, 153, 0.3);
}

.tool-tag[data-tag="time"] {
    background: rgba(139, 92, 246, 0.1);
    color: var(--accent-time);
    border-color: rgba(139, 92, 246, 0.2);
}

.dark-theme .tool-tag[data-tag="time"] {
    background: rgba(139, 92, 246, 0.15);
    border-color: rgba(139, 92, 246, 0.3);
}

/* ===== Animations ===== */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 0 5px rgba(16, 185, 129, 0);
    }
}

/* ===== Loading States ===== */
.skeleton-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.25rem;
    margin: 1.5rem 0;
}

.skeleton {
    background: linear-gradient(90deg, var(--surface) 25%, var(--border) 50%, var(--surface) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s ease-in-out infinite;
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    height: 200px;
}

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

.skeleton-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    background: var(--border);
}

.skeleton-title {
    width: 70%;
    height: 1.25rem;
    border-radius: 4px;
    margin-bottom: 0.75rem;
    background: var(--border);
}

.skeleton-description {
    width: 100%;
    height: 3.5rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    background: var(--border);
}

.skeleton-tag {
    width: 60px;
    height: 1.25rem;
    border-radius: var(--radius-full);
    background: var(--border);
}

/* ===== No Results ===== */
.no-results {
    text-align: center;
    padding: 3rem 1rem;
    grid-column: 1 / -1;
    animation: fadeIn 0.5s ease;
}

.no-results-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
    animation: bounce 2s ease infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.no-results h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.no-results p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.clear-search-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.clear-search-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* ===== Load More ===== */
.load-more-container {
    text-align: center;
    margin: 2.5rem 0;
    animation: fadeIn 0.5s ease;
}

.load-more-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2.5rem;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.load-more-btn:hover:not(:disabled) {
    background: var(--primary-gradient-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.load-more-btn:active:not(:disabled) {
    transform: translateY(0);
}

.load-more-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none !important;
}

.loading-spinner {
    display: none;
}

.load-more-btn.loading .btn-text {
    display: none;
}

.load-more-btn.loading .loading-spinner {
    display: block;
}

.showing-count {
    margin-top: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    opacity: 0.8;
}

/* ===== Featured Section ===== */
.featured-section {
    margin: 3rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 2rem;
}

.section-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-size: 1.5rem;
}

.section-subtitle {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    font-size: 0.95rem;
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.featured-tool {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    transition: var(--transition);
    display: block;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(15px);
    animation: slideUp 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    will-change: transform;
    cursor: pointer;
    height: 100%;
}

.dark-theme .featured-tool {
    background: var(--surface-dark);
    border-color: var(--border);
}

.featured-tool:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.featured-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.25rem 0.75rem;
    background: var(--primary);
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    z-index: 1;
}

.featured-icon {
    width: 64px;
    height: 64px;
    background: var(--surface);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin-bottom: 1.25rem;
    color: var(--primary);
    transition: var(--transition);
}

.dark-theme .featured-icon {
    background: var(--surface-dark);
}

.featured-tool:hover .featured-icon {
    transform: scale(1.1);
    background: var(--primary-gradient);
    color: white;
}

.featured-tool h3 {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
    font-weight: 600;
}

.featured-tool p {
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    line-height: 1.6;
    font-size: 0.9rem;
}

.featured-tag {
    display: inline-block;
    padding: 0.375rem 1rem;
    background: var(--primary);
    color: white;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.featured-tool:hover .featured-tag {
    background: var(--primary-dark);
    transform: scale(1.05);
}

/* ===== Stats Section ===== */
.stats-section {
    margin: 3rem 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.25rem;
}

.stat-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    text-align: center;
    transition: var(--transition);
    opacity: 0;
    transform: translateY(15px);
    animation: slideUp 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    will-change: transform;
}

.dark-theme .stat-card {
    background: var(--surface-dark);
    border-color: var(--border);
}

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

.stat-icon {
    width: 56px;
    height: 56px;
    background: var(--primary-gradient);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin: 0 auto 0.875rem;
    transition: var(--transition);
}

.stat-card:hover .stat-icon {
    transform: scale(1.1) rotate(5deg);
}

.stat-content h3 {
    font-size: 1.75rem;
    color: var(--primary);
    margin-bottom: 0.25rem;
    font-weight: 700;
}

.stat-content p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin: 0;
}

/* ===== Quick Links ===== */
.quick-links-section {
    margin: 3rem 0;
}

.quick-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.25rem;
}

.quick-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    will-change: transform;
}

.quick-link.primary {
    background: linear-gradient(135deg, #dc2626, #ea580c);
    color: white;
}

.quick-link.secondary {
    background: var(--primary-gradient);
    color: white;
}

.quick-link:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.link-icon {
    font-size: 1.75rem;
    opacity: 0.9;
    transition: var(--transition);
}

.quick-link:hover .link-icon {
    transform: scale(1.1);
}

.link-content {
    flex: 1;
}

.link-text {
    display: block;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.125rem;
}

.link-subtext {
    display: block;
    font-size: 0.8rem;
    opacity: 0.9;
}

.link-arrow {
    font-size: 1.125rem;
    opacity: 0.7;
    transition: var(--transition);
}

.quick-link:hover .link-arrow {
    transform: translateX(5px);
    opacity: 1;
}

/* ===== Footer ===== */
.main-footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 2.5rem 0 1.25rem;
    margin-top: 3rem;
    transition: var(--transition);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2.5rem;
    margin-bottom: 1.5rem;
}

.footer-brand h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.375rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.footer-brand p {
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    font-size: 0.9rem;
}

.footer-social {
    display: flex;
    gap: 0.75rem;
}

.footer-social a {
    width: 36px;
    height: 36px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: var(--transition);
    text-decoration: none;
}

.dark-theme .footer-social a {
    background: var(--surface-dark);
    border-color: var(--border);
    color: var(--text-secondary);
}

.footer-social a:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-2px);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
}

.footer-column h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    margin-bottom: 0.875rem;
    color: var(--text-primary);
}

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

.footer-column li {
    margin-bottom: 0.375rem;
}

.footer-column a {
    color: var(--text-secondary);
    font-size: 0.85rem;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    text-decoration: none;
}

.footer-column a:hover {
    color: var(--primary);
    transform: translateX(3px);
}

.footer-newsletter {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin: 1.5rem 0;
    text-align: center;
}

.dark-theme .footer-newsletter {
    background: var(--surface-dark);
    border-color: var(--border);
}

.footer-newsletter h4 {
    color: var(--text-primary);
    margin-bottom: 0.875rem;
    font-size: 1.125rem;
}

.newsletter-form {
    display: flex;
    gap: 0.5rem;
    max-width: 400px;
    margin: 0 auto;
}

.newsletter-form input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.85rem;
    outline: none;
    transition: var(--transition);
    min-width: 0;
    background: var(--background);
    color: var(--text-primary);
}

.newsletter-form input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.newsletter-form button {
    padding: 0.75rem 1.25rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.85rem;
    white-space: nowrap;
}

.newsletter-form button:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.footer-bottom {
    text-align: center;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
}

.footer-bottom p {
    color: var(--text-secondary);
    margin-bottom: 0.375rem;
    font-size: 0.85rem;
}

.footer-note i {
    color: #ef4444;
    margin: 0 0.125rem;
}

.footer-badges {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin-top: 0.875rem;
    flex-wrap: wrap;
}

.badge {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.75rem;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.dark-theme .badge {
    background: var(--surface-dark);
    border-color: var(--border);
    color: var(--text-secondary);
}

.badge i {
    color: var(--primary);
    font-size: 0.75rem;
}

/* ===== Cookie Consent ===== */
.cookie-consent {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    max-width: 600px;
    width: calc(100% - 2rem);
    box-shadow: var(--shadow-xl);
    z-index: var(--z-cookie);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.dark-theme .cookie-consent {
    background: var(--surface-dark);
    border-color: var(--border);
}

.cookie-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.cookie-content p {
    color: var(--text-primary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 0;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    display: block;
}

.cookie-content a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.cookie-content a:hover {
    text-decoration: underline;
}

.cookie-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
}

.cookie-btn {
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.85rem;
}

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

.cookie-btn.accept:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.cookie-btn.decline {
    background: var(--surface);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.cookie-btn.decline:hover {
    background: var(--surface-dark);
    transform: translateY(-1px);
}

/* ===== Floating Buttons ===== */
.floating-btn {
    position: fixed;
    z-index: var(--z-floating);
    border-radius: 50%;
    background: var(--primary);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    will-change: transform;
    user-select: none;
    -webkit-user-drag: none;
    width: 56px;
    height: 56px;
    font-size: 1.125rem;
}

.floating-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-3px) scale(1.05);
    box-shadow: var(--shadow-xl);
}

.floating-btn:active {
    transform: translateY(0) scale(0.95);
}

/* Back to Top */
.back-to-top {
    right: 1.25rem;
    bottom: 1.25rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px) scale(0.9);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

/* Coffee Button - VỊ TRÍ ĐÃ THAY ĐỔI: GIỮA */
.coffee-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: white;
    right: 1.25rem;
    bottom: 7rem; /* Đã đổi từ 12.75rem xuống 7rem */
    background: linear-gradient(135deg, #f9ff10, #a78443);
}

.coffee-btn:hover {
    background: linear-gradient(135deg, #f9ff10, #a78443);
    transform: translateY(-3px) scale(1.05);
    box-shadow: var(--shadow-xl);
}

.coffee-text {
    display: none;
}

/* Theme Toggle */
.theme-toggle {
    right: 1.25rem;
    bottom: 18.5rem;
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

/* Buy Me A Coffee Button - VỊ TRÍ ĐÃ THAY ĐỔI */
#bmc-wbtn {
    position: fixed !important;
    z-index: var(--z-floating) !important;
    right: 1.25rem !important;
    bottom: 12.75rem !important; 
    width: 56px !important;
    height: 56px !important;
    border-radius: 50% !important;
    background: linear-gradient(135deg, #FF813F, #FF5A5A) !important;
    box-shadow: var(--shadow-lg) !important;
    border: none !important;
    transition: var(--transition) !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    padding: 0 !important;
    margin: 0 !important;
    cursor: pointer !important;
    will-change: transform !important;
}

#bmc-wbtn:hover {
    transform: translateY(-3px) scale(1.05) !important;
    box-shadow: var(--shadow-xl) !important;
}

#bmc-wbtn:active {
    transform: translateY(0) scale(0.95) !important;
}

#bmc-wbtn img {
    width: 28px !important;
    height: 28px !important;
    margin: 0 !important;
    padding: 0 !important;
    filter: brightness(0) invert(1) !important;
}

/* Buy Me A Coffee modal position */
#bmc-wbtn + div {
    right: 1.25rem !important;
    bottom: 18.5rem !important;
    z-index: var(--z-floating) !important;
}

/* ===== Mobile Layout ===== */
@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .header-content {
        gap: 0.875rem;
    }
    
    .brand h1 {
        font-size: 1.5rem;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .featured-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .quick-links {
        grid-template-columns: 1fr;
    }
    
    /* Floating Buttons cho Mobile */
    .floating-btn {
        width: 48px;
        height: 48px;
        font-size: 1rem;
    }
    
    .back-to-top {
        right: 1rem;
        bottom: 1rem;
    }
    
    .coffee-btn {
        right: 1rem;
        bottom: 5.5rem; /* Đã điều chỉnh cho mobile */
    }
    
    .theme-toggle {
        right: 1rem;
        bottom: 10rem; /* Đã điều chỉnh cho mobile */
    }
    
    #bmc-wbtn {
        right: 1rem !important;
        bottom: 14.5rem !important; /* Đã điều chỉnh cho mobile */
        width: 48px !important;
        height: 48px !important;
    }
    
    #bmc-wbtn + div {
        right: 1rem !important;
        bottom: 14.5rem !important;
    }
    
    #bmc-wbtn img {
        width: 24px !important;
        height: 24px !important;
    }
    
    .cookie-consent {
        left: 1rem;
        right: 1rem;
        bottom: 1rem;
        max-width: none;
        transform: none;
    }
    
    .cookie-actions {
        flex-direction: column;
    }
    
    /* Tool card mobile optimization */
    .tool-card {
        padding: 1.25rem;
    }
    
    .tool-card h3 {
        min-height: auto;
        font-size: 1.125rem;
    }
    
    .tool-card p {
        min-height: auto;
        -webkit-line-clamp: 2;
    }
}

/* ===== Small Mobile Layout ===== */
@media (max-width: 480px) {
    .brand h1 {
        font-size: 1.375rem;
    }
    
    .subtitle {
        font-size: 0.8rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .quick-stats {
        gap: 0.75rem;
    }
    
    .stat-item {
        padding: 0.375rem 0.75rem;
        font-size: 0.8rem;
    }
    
    .newsletter-form {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .newsletter-form button {
        width: 100%;
    }
    
    .section-title {
        flex-direction: column;
        gap: 0.375rem;
        font-size: 1.375rem;
    }
    
    /* Floating Buttons nhỏ hơn */
    .floating-btn {
        width: 44px;
        height: 44px;
        font-size: 0.9rem;
    }
    
    .back-to-top {
        right: 0.875rem;
        bottom: 0.875rem;
    }
    
    .coffee-btn {
        right: 0.875rem;
        bottom: 5.125rem; /* Đã điều chỉnh cho mobile nhỏ */
    }
    
    .theme-toggle {
        right: 0.875rem;
        bottom: 13.625rem; /* Đã điều chỉnh cho mobile nhỏ */
    }
    
    #bmc-wbtn {
        right: 0.875rem !important;
        bottom: 9.375rem !important; /* Đã điều chỉnh cho mobile nhỏ */
        width: 44px !important;
        height: 44px !important;
    }
    
    #bmc-wbtn + div {
        right: 0.875rem !important;
        bottom: 13.625rem !important;
    }
    
    #bmc-wbtn img {
        width: 22px !important;
        height: 22px !important;
    }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    .tool-card:hover {
        transform: none;
    }
    
    .tool-card:active {
        transform: scale(0.98);
    }
    
    .category-card:hover,
    .filter-chip:hover {
        transform: none;
    }
    
    .category-card:active,
    .filter-chip:active {
        transform: scale(0.98);
    }
    
    .floating-btn:hover {
        transform: none;
    }
    
    .floating-btn:active {
        transform: scale(0.9);
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Focus Styles cho Accessibility */
:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Search highlight */
.search-highlight {
    background-color: rgba(255, 255, 0, 0.3);
    padding: 0.125rem 0.25rem;
    border-radius: 0.25rem;
}

.dark-theme .search-highlight {
    background-color: rgba(255, 255, 0, 0.5);
    color: #000;
}

/* Visually hidden for screen readers */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}