/* ========================================
   Try Swiss Knife - Main Styles
   ======================================== */

/* CSS Variables */
:root {
    /* Colors */
    --color-primary: #1a2332;
    --color-accent: #00a8e8;
    --color-accent-hover: #0096d1;
    --color-secondary: #e31e24;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-text-dark: #1a202c;
    --color-text-medium: #4a5568;
    --color-text-light: #718096;
    --color-background: #f7fafc;
    --color-white: #ffffff;
    --color-border: #e2e8f0;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Layout */
    --container-max-width: 1200px;
    --header-height: 70px;
}

/* ========================================
   Reset & Base Styles
   ======================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-dark);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

button {
    font-family: inherit;
    cursor: pointer;
}

/* ========================================
   Layout Components
   ======================================== */

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

/* ========================================
   Header
   ======================================== */

.header {
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: var(--header-height);
    padding: var(--spacing-sm) 0;
}

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

.logo-image {
    width: 85px;
    height: 85px;
    flex-shrink: 0;
}

.logo-content {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.logo-text {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--color-primary);
    line-height: 1.2;
}

.logo-tagline {
    font-size: 1rem;
    color: var(--color-text-light);
    line-height: 1;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.header-info {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.25rem;
}

.header-subtitle {
    font-size: 0.875rem;
    color: var(--color-text-medium);
    font-weight: 500;
}

.header-badges {
    display: flex;
    gap: var(--spacing-xs);
}

.mini-badge {
    font-size: 0.7rem;
    color: var(--color-text-light);
    background-color: var(--color-background);
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    cursor: help;
    transition: all 0.2s ease;
}

.mini-badge:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
    transform: translateY(-1px);
}

/* ========================================
   Language Selector
   ======================================== */

.language-selector {
    position: relative;
}

.language-btn {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 0.75rem;
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-dark);
    height: 40px;
}

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

.lang-icon {
    font-size: 1.1rem;
}

.lang-text {
    font-size: 0.875rem;
}

.lang-arrow {
    font-size: 0.7rem;
    transition: transform 0.2s ease;
}

.language-btn[aria-expanded="true"] .lang-arrow {
    transform: rotate(180deg);
}

.language-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    min-width: 140px;
    display: none;
    z-index: 1000;
    overflow: hidden;
}

.language-dropdown.active {
    display: block;
    animation: slideDown 0.2s ease;
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.625rem 0.875rem;
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    transition: background-color 0.2s ease;
    font-size: 0.875rem;
    color: var(--color-text-dark);
}

.lang-option:hover {
    background-color: var(--color-background);
}

.lang-option.active {
    background-color: rgba(0, 168, 232, 0.1);
    color: var(--color-accent);
}

.lang-check {
    font-size: 0.75rem;
    opacity: 0;
    transition: opacity 0.2s ease;
}

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

/* ========================================
   Navigation - Collapsible
   ======================================== */
.nav {
    display: none;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: 0;
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-sm);
    background-color: var(--color-white);
}

.nav.nav-open {
    display: flex;
    padding: var(--spacing-sm) 0;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.nav-link {
    color: var(--color-text-medium);
    font-weight: 500;
    padding: var(--spacing-sm) 0;
    transition: all 0.2s ease;
    border-bottom: 1px solid var(--color-border);
}

.nav-link:last-child {
    border-bottom: none;
}

.nav-link:hover {
    color: var(--color-primary);
    padding-left: var(--spacing-xs);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color 0.2s ease;
    position: relative;
    padding: 0;
}

.menu-toggle:hover {
    background-color: var(--color-background);
}

.menu-icon {
    position: relative;
    width: 20px;
    height: 2px;
    background-color: var(--color-primary);
    transition: background-color 0.3s ease;
}

.menu-icon::before,
.menu-icon::after {
    content: '';
    position: absolute;
    left: 0;
    width: 20px;
    height: 2px;
    background-color: var(--color-primary);
    transition: transform 0.3s ease, top 0.3s ease;
}

.menu-icon::before {
    top: -6px;
}

.menu-icon::after {
    top: 6px;
}

/* Menu toggle animation */
.menu-toggle[aria-expanded="true"] .menu-icon {
    background-color: transparent;
}

.menu-toggle[aria-expanded="true"] .menu-icon::before {
    top: 0;
    transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-icon::after {
    top: 0;
    transform: rotate(-45deg);
}

/* ========================================
   Tools Section - Sidebar Layout
   ======================================== */

.tools-section {
    padding: var(--spacing-lg) 0 var(--spacing-2xl) 0;
}

/* Sidebar + Main Content Layout */
.tools-layout {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

/* Left Sidebar - Collapsible */
.tools-sidebar {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    position: sticky;
    top: calc(var(--header-height) + var(--spacing-md));
    transition: width 0.3s ease;
    overflow: hidden;
    width: 60px; /* Collapsed width */
}

.tools-sidebar.expanded {
    width: 250px; /* Expanded width */
}

/* Sidebar Toggle Button */
.sidebar-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 50px;
    background: none;
    border: none;
    border-bottom: 1px solid var(--color-border);
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--color-text-dark);
    transition: all 0.2s ease;
}

.sidebar-toggle:hover {
    background-color: var(--color-background);
}

.toggle-icon {
    transition: transform 0.3s ease;
}

.tools-sidebar.expanded .toggle-icon {
    transform: rotate(90deg);
}

/* Sidebar Content */
.sidebar-content {
    padding: var(--spacing-lg);
}

/* Hide title and search when collapsed */
.tools-sidebar:not(.expanded) .sidebar-title,
.tools-sidebar:not(.expanded) .sidebar-search {
    display: none;
}

/* Keep category buttons visible but styled differently when collapsed */
.tools-sidebar:not(.expanded) .sidebar-content {
    padding: var(--spacing-sm) 0;
}

.tools-sidebar.expanded .sidebar-content {
    padding: var(--spacing-lg);
}

.sidebar-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
    white-space: nowrap;
}

/* Search in Sidebar */
.sidebar-search {
    margin-bottom: var(--spacing-md);
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 168, 232, 0.1);
}

.category-filters-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.category-filter-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    color: var(--color-text-medium);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
    white-space: nowrap;
}

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

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

.filter-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.filter-text {
    flex: 1;
}

.filter-count {
    font-size: 0.8rem;
    background-color: rgba(0, 0, 0, 0.1);
    padding: 0.125rem 0.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.category-filter-btn.active .filter-count {
    background-color: rgba(255, 255, 255, 0.2);
}

/* When collapsed, show only icons */
.tools-sidebar:not(.expanded) .category-filter-btn {
    justify-content: center;
    padding: var(--spacing-sm);
    margin: 0 auto;
    width: 45px;
    min-height: 45px;
    position: relative;
}

/* Enhanced tooltip display when collapsed */
.tools-sidebar:not(.expanded) .category-filter-btn[title]:hover::after {
    content: attr(title);
    position: absolute;
    left: calc(100% + 10px);
    top: 50%;
    transform: translateY(-50%);
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    white-space: nowrap;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    pointer-events: none;
}

/* Tooltip arrow */
.tools-sidebar:not(.expanded) .category-filter-btn[title]:hover::before {
    content: '';
    position: absolute;
    left: calc(100% + 4px);
    top: 50%;
    transform: translateY(-50%);
    border: 6px solid transparent;
    border-right-color: var(--color-primary);
    z-index: 1001;
    pointer-events: none;
}

.tools-sidebar:not(.expanded) .filter-text,
.tools-sidebar:not(.expanded) .filter-count {
    display: none;
}

/* When expanded, show full button */
.tools-sidebar.expanded .category-filter-btn {
    width: 100%;
}

/* Main Content Area */
.tools-main {
    min-height: 400px;
}

/* Category Sections */
.category-section {
    margin-bottom: var(--spacing-2xl);
}

.category-section.hidden {
    display: none;
}

.category-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.category-icon {
    font-size: 1.75rem;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

/* ========================================
   Tool Cards
   ======================================== */

.tool-card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    position: relative;
}

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

.tool-card.coming-soon {
    opacity: 0.7;
}

.tool-card.coming-soon:hover {
    transform: none;
}

.coming-soon-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background-color: var(--color-warning);
    color: var(--color-white);
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Tool Header - Icon + Title on same line */
.tool-header {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.tool-icon {
    font-size: 2.5rem;
    line-height: 1;
    flex-shrink: 0;
}

.tool-title-group {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
    flex: 1;
}

.tool-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary);
    line-height: 1.2;
    margin: 0;
}

.tool-subtitle {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-accent);
    line-height: 1.3;
    margin: 0;
}

.tool-description {
    color: var(--color-text-medium);
    flex-grow: 1;
    line-height: 1.5;
    font-size: 0.875rem;
    margin: 0;
}

.tool-details {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    padding: 0.625rem;
    background-color: var(--color-background);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-accent);
}

.tool-detail-item {
    display: flex;
    align-items: flex-start;
    gap: 0.4rem;
    font-size: 0.8rem;
    line-height: 1.4;
}

.detail-icon {
    font-size: 0.875rem;
    flex-shrink: 0;
    line-height: 1.4;
}

.detail-text {
    color: var(--color-text-medium);
    flex: 1;
}

.detail-text strong {
    color: var(--color-text-dark);
    font-weight: 600;
}

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

.tag {
    background-color: var(--color-background);
    color: var(--color-text-medium);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
}

.tool-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.625rem var(--spacing-md);
    background-color: var(--color-accent);
    color: var(--color-white);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    transition: background-color 0.2s ease;
}

.tool-button:hover:not(:disabled) {
    background-color: var(--color-accent-hover);
}

.tool-button:disabled {
    background-color: var(--color-text-light);
    cursor: not-allowed;
}

.button-icon {
    font-size: 1.1rem;
    transition: transform 0.2s ease;
}

.tool-button:hover:not(:disabled) .button-icon {
    transform: translateX(4px);
}

/* ========================================
   Future Tools Section
   ======================================== */

.future-tools-section {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: var(--radius-lg);
    border: 2px dashed var(--color-border);
}

.future-tools-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.future-tools-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.future-tools-description {
    color: var(--color-text-medium);
    margin-bottom: var(--spacing-lg);
    font-size: 1rem;
    line-height: 1.6;
}

.future-categories {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.future-category {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background-color: var(--color-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    min-width: 140px;
}

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

.future-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-dark);
}

.future-tools-note {
    color: var(--color-text-medium);
    font-size: 0.9rem;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.future-tools-note strong {
    color: var(--color-primary);
}

.future-tools-note a {
    color: var(--color-accent);
    font-weight: 500;
}

.future-tools-note a:hover {
    text-decoration: underline;
}

/* ========================================
   About Section
   ======================================== */

.about-section {
    padding: var(--spacing-2xl) 0;
    background-color: var(--color-white);
}

.about-content {
    text-align: center;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.about-card {
    padding: var(--spacing-lg);
}

.about-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.about-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.about-card p {
    color: var(--color-text-medium);
    line-height: 1.7;
}

/* ========================================
   Footer
   ======================================== */

.footer {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
    margin-bottom: var(--spacing-md);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.footer-logo-image {
    width: 32px;
    height: 32px;
}

.footer-logo-text {
    font-size: 1.125rem;
    font-weight: 600;
}

.footer-description {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

.footer-heading {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

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

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    transition: color 0.2s ease;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-md);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

/* ========================================
   Responsive Design
   ======================================== */

/* Tablet (768px and below) */
@media (max-width: 768px) {
    /* Change layout to single column */
    .tools-layout {
        grid-template-columns: 1fr !important;
        gap: 0 !important;
    }
    
    /* Hide collapsed sidebar on mobile, show as overlay when expanded */
    .tools-sidebar {
        position: fixed !important;
        left: -100% !important;
        top: 0 !important;
        height: 100vh !important;
        width: 280px !important;
        z-index: 1000 !important;
        border-radius: 0 !important;
        transition: left 0.3s ease !important;
        overflow-y: auto !important;
        box-shadow: 2px 0 10px rgba(0, 0, 0, 0.3) !important;
    }
    
    .tools-sidebar.expanded {
        left: 0 !important;
        width: 280px !important;
    }
    
    /* Make toggle button a floating action button on mobile */
    .tools-sidebar .sidebar-toggle {
        position: fixed !important;
        left: 16px !important;
        bottom: 24px !important;
        top: auto !important;
        width: 56px !important;
        height: 56px !important;
        border-radius: 50% !important;
        background-color: var(--color-accent) !important;
        color: white !important;
        border: none !important;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3) !important;
        z-index: 1001 !important;
        font-size: 1.5rem !important;
    }
    
    .tools-sidebar.expanded .sidebar-toggle {
        left: 240px !important;
    }
    
    /* Show all content when sidebar is visible on mobile */
    .tools-sidebar .sidebar-content {
        padding: var(--spacing-lg) !important;
    }
    
    .tools-sidebar .sidebar-title,
    .tools-sidebar .sidebar-search {
        display: block !important;
    }
    
    /* Force vertical layout for category filters */
    .tools-sidebar .category-filters-sidebar {
        display: flex !important;
        flex-direction: column !important;
        gap: var(--spacing-sm) !important;
    }
    
    .tools-sidebar .category-filter-btn {
        width: 100% !important;
        display: flex !important;
        flex-direction: row !important;
        justify-content: flex-start !important;
        align-items: center !important;
        padding: var(--spacing-md) var(--spacing-md) !important;
        gap: var(--spacing-sm) !important;
        min-height: 48px !important; /* Touch-friendly size */
    }
    
    .tools-sidebar .filter-icon {
        font-size: 1.5rem !important;
        flex-shrink: 0 !important;
    }
    
    .tools-sidebar .filter-text,
    .tools-sidebar .filter-count {
        display: inline-block !important;
    }
    
    .tools-sidebar .filter-text {
        flex: 1 !important;
        font-size: 1rem !important;
    }
    
    .tools-sidebar .filter-count {
        font-size: 0.875rem !important;
    }
    
    /* No tooltips on mobile */
    .tools-sidebar .category-filter-btn[title]:hover::after,
    .tools-sidebar .category-filter-btn[title]:hover::before {
        display: none !important;
    }
    
    /* Add backdrop when sidebar is open */
    .tools-sidebar.expanded::before {
        content: '';
        position: fixed;
        top: 0;
        left: 280px;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: -1;
    }
    
    .header-content {
        flex-wrap: wrap;
    }
    
    .header-right {
        order: 3;
        width: 100%;
        justify-content: space-between;
        margin-top: var(--spacing-xs);
    }
    
    .header-info {
        align-items: flex-start;
        flex: 1;
    }
    
    .header-subtitle {
        font-size: 0.8rem;
    }
    
    .mini-badge {
        font-size: 0.65rem;
        padding: 0.125rem 0.4rem;
    }
    
    .language-btn {
        padding: 0.4rem 0.65rem;
        height: 36px;
    }
    
    .lang-text {
        font-size: 0.8rem;
    }
    
    .category-title {
        font-size: 1.25rem;
    }
    
    /* Sidebar becomes horizontal on tablet */
    .tools-layout {
        grid-template-columns: 1fr;
    }
    
    .tools-sidebar {
        position: static;
        padding: var(--spacing-md);
    }
    
    .sidebar-title {
        margin-bottom: var(--spacing-sm);
    }
    
    .sidebar-search {
        margin-bottom: var(--spacing-sm);
    }
    
    .category-filters-sidebar {
        flex-direction: row;
        overflow-x: auto;
        gap: var(--spacing-sm);
        -webkit-overflow-scrolling: touch;
        scrollbar-width: thin;
        padding-bottom: var(--spacing-xs);
    }
    
    .category-filters-sidebar::-webkit-scrollbar {
        height: 3px;
    }
    
    .category-filters-sidebar::-webkit-scrollbar-track {
        background: var(--color-background);
    }
    
    .category-filters-sidebar::-webkit-scrollbar-thumb {
        background: var(--color-border);
        border-radius: 3px;
    }
    
    .category-filter-btn {
        white-space: nowrap;
        flex-shrink: 0;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .future-tools-section {
        padding: var(--spacing-md);
        margin-top: var(--spacing-xl);
    }
    
    .future-tools-title {
        font-size: 1.5rem;
    }
    
    .future-categories {
        gap: var(--spacing-md);
    }
    
    .future-category {
        min-width: 120px;
        padding: var(--spacing-sm);
    }
}

/* Mobile (480px and below) */
@media (max-width: 480px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 2.5rem;
    }
    
    .logo-image {
        width: 72px;
        height: 72px;
    }
    
    .logo-text {
        font-size: 1.4rem;
    }
    
    .logo-tagline {
        display: none;
    }
    
    .header-subtitle {
        font-size: 0.75rem;
    }
    
    .header-badges {
        display: none;
    }
    
    .menu-toggle {
        width: 36px;
        height: 36px;
    }
    
    .language-btn {
        padding: 0.35rem 0.5rem;
        height: 34px;
        gap: 0.25rem;
    }
    
    .lang-icon {
        font-size: 1rem;
    }
    
    .lang-text {
        font-size: 0.75rem;
    }
    
    .lang-arrow {
        font-size: 0.65rem;
    }
    
    .language-dropdown {
        min-width: 130px;
    }
    
    /* Fix sidebar on mobile */
    .tools-sidebar {
        padding: var(--spacing-sm);
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .sidebar-title {
        font-size: 1rem;
        margin-bottom: var(--spacing-sm);
    }
    
    .category-filters-sidebar {
        overflow-x: auto;
        scrollbar-width: none;
        -webkit-overflow-scrolling: touch;
    }
    
    .category-filters-sidebar::-webkit-scrollbar {
        display: none;
    }
    
    .category-filter-btn {
        flex-shrink: 0;
        font-size: 0.85rem;
        padding: 0.4rem 0.75rem;
    }
    
    .filter-icon {
        font-size: 1.1rem;
    }
    
    .filter-count {
        font-size: 0.7rem;
        padding: 0.1rem 0.4rem;
    }
    
    .tool-card {
        padding: var(--spacing-md);
    }
    
    .future-tools-section {
        padding: var(--spacing-sm);
    }
    
    .future-tools-title {
        font-size: 1.25rem;
    }
    
    .future-tools-description {
        font-size: 0.9rem;
    }
    
    .future-categories {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .future-category {
        width: 100%;
    }
    
    .future-tools-note {
        font-size: 0.85rem;
    }
    
    .tool-card {
        padding: var(--spacing-md);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Utility Classes
   ======================================== */

.hidden {
    display: none;
}

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

/* ========================================
   Accessibility
   ======================================== */

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

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