/* ================================
   CSS VARIABLES & THEME SYSTEM
   ================================ */

/* Light theme variables (default) */
:root {
    /* Colors */
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary: #64748b;
    --success: #059669;
    --success-hover: #047857;
    --warning: #d97706;
    --danger: #dc2626;
    
    /* Backgrounds */
    --background: #f9f9f9;
    --background-light: #fafafa;
    --background-card: #ffffff;
    --background-input: #ffffff;
    --background-footer: #fafafa;
    --background-categ: #fafafa;

    /* Text colors */
    --text: #1e293b;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    
    /* Borders & Effects */
    --border: #e2e8f0;
    --border-focus: #3b82f6;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    
    /* Layout */
    --border-radius: 8px;
    --transition: all 0.2s ease-in-out;
    --font-family:  Segoe UI, Frutiger, Frutiger Linotype ,Dejavu Sans, Helvetica Neue, Arial, sans-serif; 
}

/* Dark theme variables */
[data-theme="dark"] {
    /* Backgrounds */
    --background: #0f172a;
    --background-light: #1e293b;
    --background-card: #1e293b;
    --background-input: #334155;
    --background-footer: #1e293b;
    --background-categ: #0f172a;

    /* Text colors */
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --text-light: #64748b;
    
    /* Borders & Effects */
    --border: #334155;
    --border-focus: #60a5fa;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.2);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4);
}

/* ================================
   BASE STYLES & RESET
   ================================ */

* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background-color: var(--background);
    color: var(--text);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    transition: var(--transition);
}

/* Scrollbar customization */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background-light);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Improved breadcrumb accessibility */
.breadcrumb-item + .breadcrumb-item::before {
    content: "›";
    font-weight: bold;
}

article {
    padding: .5rem .7rem;
    margin-bottom: 1.5rem;
    line-height: 1.7;
    text-align: justify;
    -webkit-hyphens: auto;
    -ms-hyphens: auto;
    hyphens: auto;
}

/* ================================
   BUTTONS
   ================================ */

.btn {
    border-radius: var(--border-radius);
    font-weight: 500;
    border: none;
    font-family: var(--font-family);
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    transition: var(--transition);
}

/* Focus indicators and keyboard navigation */
button:focus,
input:focus,
textarea:focus,
select:focus,
a:focus {
    outline: 3px solid #0066cc;
    outline-offset: 2px;
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.3);
}

/* Better button contrast */
.btn-outline-primary {
    color: var(--primary);
    border: 2px solid var(--primary);
    background-color: transparent;
    border-width: 1px;
    position: relative;
}

.btn-outline-primary:hover,
.btn-outline-primary:focus {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.btn-outline-primary:hover:not(:disabled) {
    background-color: var(--primary);
    border-color: var(--primary);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

/* Secondary buttons */
.btn-outline-secondary {
    color: var(--text-muted);
    border: 2px solid var(--border);
    background-color: transparent;
}

.btn-outline-secondary:hover:not(:disabled) {
    background-color: var(--background-light);
    border-color: var(--text-muted);
    color: var(--text);
    transform: translateY(-1px);
}

/* Primary buttons */
.btn-primary {
    background-color: var(--primary);
    border-color: var(--primary);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
    color: white;
}

/* Success buttons */
.btn-success {
    background-color: var(--success);
    border-color: var(--success);
    color: white;
}

.btn-success:hover:not(:disabled) {
    background-color: var(--success-hover);
    border-color: var(--success-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
    color: white;
}

.btn-link {
    color: var(--text) !important;
}

/* Symbol buttons specific styles */
.symbol-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.symbol-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border: 2px solid var(--border);
    background-color: var(--background-card);
    color: var(--text);
    border-radius: var(--border-radius);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    user-select: none;
}

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

.symbol-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.symbol-btn:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    border-color: var(--primary);
}

.symbol-category {
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    background-color: var(--background-card);
    margin-bottom: 1rem;
}

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

/* Responsive adjustments for symbol grid */
@media (max-width: 576px) {
    .symbol-grid {
        grid-template-columns: repeat(auto-fill, minmax(45px, 1fr));
        gap: 0.4rem;
    }
    
    .symbol-btn {
        width: 45px;
        height: 45px;
        font-size: 1.3rem;
    }
    
    .symbol-category {
        padding: 1rem;
    }
}

/* ================================
   FORM ELEMENTS
   ================================ */

/* Form controls */
.form-control {
    background-color: var(--background-input);
    border: 2px solid var(--border);
    color: var(--text);
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-family: var(--font-family);
    font-size: 1rem;
    resize: vertical;
}

.form-control:focus {
    background-color: var(--background-input);
    border-color: var(--border-focus);
    color: var(--text);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    outline: none;
}

.form-control::placeholder {
    color: var(--text-light);
    opacity: 1;
}

.form-control[readonly] {
    background-color: var(--background-light);
    border-color: var(--border);
    cursor: default;
}

.form-label {
    color: var(--text);
    font-weight: 600;
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
}
.form-text {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ================================
   NAVBAR
   ================================ */

/* Header styles */
.navbar {
    background-color: var(--background-card) !important;
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    box-shadow: var(--shadow-sm);
}

.navbar ul {
    list-style: none;
    padding: 0;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text) !important;
    transition: var(--transition);
    text-decoration: none;
}

.navbar-brand:hover {
    transform: translateY(-1px);
    color: var(--primary) !important;
}

.navbar .logo img {
    height: 2.5rem;
    width: auto;
}

.nav-link {
    color: var(--text) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: var(--border-radius);
    transition: var(--transition);
    text-decoration: none;
}

.nav-link:hover, .nav-link:focus {
    background-color: var(--background-light);
    color: var(--primary) !important;
    transform: translateY(-1px);
}

.dropdown-menu {
    background-color: var(--background-card);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    border-radius: var(--border-radius);
}

.dropdown-item {
    color: var(--text);
    transition: var(--transition);
    padding: 0.5rem 1rem;
}

.dropdown-item:hover, .dropdown-item:focus {
    background-color: var(--background-light);
    color: var(--primary);
}

/* Skip link styling */
.visually-hidden-focusable:focus {
    position: absolute;
    top: 10px;
    left: 10px;
    z-index: 1050;
    padding: 8px 16px;
    background: #000;
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
    font-weight: bold;
}

/* Theme toggle */
#theme-toggle {
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.2rem;
    padding: 0.5rem;
    border-radius: 50%;
    transition: var(--transition);
}

#theme-toggle:hover {
    background-color: var(--background-light);
    transform: rotate(180deg);
}

/* ================================
   MAIN CONTENT AREA
   ================================ */

/* Main container */
.main {
    flex: 1;
    padding: 2rem 0;
    background-color: var(--background);
    min-height: 90vh;
}

/* Hero section */
.hero {
    text-align: center;
    padding: 2rem .5rem 2rem .5rem;
    max-width: 60rem;
	width: 95%;
    margin: 0 auto;
}

.hero .title {
    color: var(--text);
    margin-bottom: 1.3rem;
    font-weight: 700;
    font-size: 1.9rem;
    line-height: 1.2;
}

.hero .description {
    color: var(--text-muted);
    font-size: 1.1rem;
    line-height: 1.6;
    margin: 0 auto;
}

/* Tools count badge */
.hero span.count {
    background-color: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
}

/* ================================
   SEARCH FUNCTIONALITY
   ================================ */

/* Search container */
.search-container {
    position: relative;
    margin-bottom: 2rem;
    max-width: 55rem;
    width: 100%;
    margin-left: auto;
    margin-right: auto;
}

.search-input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    border: 2px solid var(--border);
    border-radius: var(--border-radius);
    background-color: var(--background-input);
    color: var(--text);
    font-size: 1rem;
    font-family: var(--font-family);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    outline: none !important;
}

.search-input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    transform: translateY(-1px);
}

.search-input::placeholder {
    color: var(--text-light);
    opacity: 1;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
    z-index: 2;
}

/* ================================
   CATEGORY FILTERS
   ================================ */

.category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 3rem;
    justify-content: center;
    padding: 0 1rem;
}

.category-btn {
    background-color: var(--background-card);
    border: 2px solid var(--border);
    color: var(--text);
    padding: 0.6rem 1.1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 500;
    font-family: var(--font-family);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.3rem;
    white-space: nowrap;
    text-decoration: none;
    min-height: 44px; /* Accessibility: minimum touch target */
}

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

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

.category-btn svg {
    flex-shrink: 0;
}

/* ================================
   TOOLS GRID
   ================================ */

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.tools-grid .tool-card {
    background-color: var(--background-card);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
}

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

.tools-grid .tool-header {
    display: block;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.tools-grid .tool-categ {
    margin-bottom: 1rem;
}

.tools-grid .tool-categ span {
    background-color: var(--background-categ);
    border-radius: var(--border-radius);
    font-size: .7rem;
    color: var(--text);
    padding: .3rem .5rem;
    border: 1px solid var(--border);
}

.tools-grid .tool-link {
    text-decoration: none !important;
}

.tools-grid .tool-title {
    color: var(--text);
    font-size: 1.2rem;
    font-weight: 600;
    margin: 0;
    line-height: 1.3;
    flex: 1;
}

.tools-grid .tool-body {
    display: flex;
    flex-direction: column;
    flex: 1;
}

.tools-grid .tool-description {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: auto;
    flex: 1;
}

.tools-grid .tool-actions {
    margin-top: auto;
    padding-top: 1.5rem;
}

.tools-grid .btn {
    display: block;
    text-decoration: none !important;
    list-style: none;
}

/* ================================
   NO RESULTS STATE
   ================================ */

.no-results {
    text-align: center;
    padding: 3rem 2rem;
    background-color: var(--background-card);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    margin: 2rem 0;
    display: none; /* Hidden by default, shown by JavaScript */
}

.no-results svg {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.no-results h3 {
    color: var(--text);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.no-results p {
    color: var(--text-muted);
    font-size: 1rem;
    margin: 0;
}

/* ================================
   FOOTER
   ================================ */

/* Footer */
footer {
    background-color: var(--background-footer);
    color: var(--text);
}

footer .logo img {
    height: 4rem;
    width: auto;
    max-width: 90%;
    object-fit: contain;
    margin-bottom: 2rem;
}

footer h5 {
    font-weight: 600;
}

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

footer a:hover {
    transform: translateX(3px);
}

/* ================================
   COMPONENTS
   ================================ */

/* Tool interface */
.tool-interface {
    background-color: var(--background);
    padding: 2rem 0 4rem 0;
}

.card-input,
.card-output {
    padding: 1.5rem;
    background-color: var(--background-card);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    height: 100%;
    margin-bottom: 1.5rem;
}

.card-input:hover,
.card-output:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

/* SEO Content */
.seo-content {
    background-color: var(--background);
    border-top: 1px solid var(--border);
    padding: 4rem 0;
    color: var(--text);
}

/* ================================
   UTILITY COMPONENTS
   ================================ */

/* Loading states */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

/* Status messages for screen readers */
#status-messages {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Better keyboard navigation for accordion */
.accordion-button:focus {
    z-index: 2;
}

/* ================================
   RESPONSIVE DESIGN
   ================================ */

/* Better spacing for touch targets */
@media (pointer: coarse) {
    .btn {
        min-height: 44px;
        min-width: 44px;
    }
    
    .accordion-button {
        min-height: 48px;
    }
}

@media (max-width: 768px) {
    .main {
        padding: 1rem 0;
    }
    
    .hero {
        padding: 1.5rem 0 2rem 0;
    }
    
    .hero .page-title {
        font-size: 2rem;
    }
    
    .hero .page-description {
        font-size: 1.1rem;
    }
    
    .search-container {
        margin-bottom: 1.5rem;
    }
    
    .category-filters {
        overflow-x: auto;
        scrollbar-width: none;
        -ms-overflow-style: none;
        justify-content: flex-start;
        padding-bottom: 0.5rem;
        margin-bottom: 2rem;
    }
    
    .category-filters::-webkit-scrollbar {
        display: none;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .tool-card {
        padding: 1.25rem;
    }
}

@media (max-width: 576px) {
    .hero .page-title {
        font-size: 1.75rem;
    }
    
    .search-input {
        padding: 0.875rem 0.875rem 0.875rem 2.5rem;
        font-size: 0.95rem;
    }
    
    .search-icon {
        left: 0.875rem;
    }
    
    .category-btn {
        padding: 0.625rem 1rem;
        font-size: 0.85rem;
    }
    
    .tool-title {
        font-size: 1.1rem;
    }
    
    .tool-description {
        font-size: 0.9rem;
    }
    
    .no-results {
        padding: 2rem 1rem;
    }
}

/* ================================
   SPECIAL MEDIA QUERIES
   ================================ */

/* High contrast mode support */
@media (prefers-contrast: high) {
    .btn-outline-primary {
        border-width: 3px;
        font-weight: bold;
    }
    
    .form-control {
        border-width: 2px;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .btn:hover {
        transform: none;
    }
    
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print styles */
@media print {
    .navbar,
    footer,
    .btn,
    aside {
        display: none !important;
    }
    
    .tool-interface {
        break-inside: avoid;
    }
    
    .seo-content {
        page-break-before: auto;
    }
}

/* ================================
   ACCESSIBILITY & FOCUS STATES
   ================================ */

/* Focus visible for better accessibility */
.search-input:focus-visible,
.category-btn:focus-visible,
.tool-link:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
    .tool-card,
    .category-btn,
    .search-input,
    .tool-link {
        transition: none;
    }
    
    .tool-card:hover,
    .category-btn:hover,
    .tool-link:hover {
        transform: none;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .tool-card {
        border-width: 2px;
    }
    
    .category-btn {
        border-width: 2px;
    }
    
    .search-input {
        border-width: 2px;
    }
}

/* Print styles */
@media print {
    .main {
        padding: 0;
    }
    
    .search-container,
    .category-filters {
        display: none;
    }
    
    .tools-grid {
        display: block;
    }
    
    .tool-card {
        break-inside: avoid;
        margin-bottom: 1rem;
        box-shadow: none;
        border: 1px solid #000;
    }
    
    .tool-link {
        background-color: transparent !important;
        color: #000 !important;
        border: 1px solid #000;
    }
}

/* ================================
   RECOMMENDED SECTION
   ================================ */

.recommended {
    padding: 3rem 0;
}

.recommended #recommended-grid {
    padding: 1rem;
    text-align: center;
    margin-bottom: 2rem;
}

.recommended #recommended-grid .recommended-item {
    padding: .5rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    width: 100%;
    background-color: var(--background-card);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    overflow: hidden;
}

.recommended #recommended-grid .recommended-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.recommended #recommended-grid .recommended-item a {
    display: block;
    padding: 1.5rem;
    text-decoration: none;
    color: var(--text);
    transition: var(--transition);
}