/* ==========================================================================
   TechnicalYard Developer Tools - Core Design System & Layout (main.css)
   Modern, High-Contrast Developer Aesthetic with Dual Themes (Dark & Light)
   ========================================================================== */

/* 1. Design Tokens & Color Palettes */
:root {
    /* Default Dark Mode Tokens (Modern High-Tech Obsidian & Cyber Indigo) */
    --color-bg-body: #0b0f19;
    --color-bg-surface: #111827;
    --color-bg-subtle: #172033;
    --color-bg-muted: #1e293b;
    --color-bg-surface-rgb: 17, 24, 39;
    
    --color-text-main: #f8fafc;
    --color-text-muted: #94a3b8;
    --color-text-subtle: #64748b;
    --color-text-inverse: #0b0f19;

    --color-primary: #6366f1;
    --color-primary-hover: #818cf8;
    --color-primary-subtle: rgba(99, 102, 241, 0.15);
    --color-primary-border: rgba(99, 102, 241, 0.35);
    --color-accent: #22d3ee;
    
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #22d3ee 100%);
    --gradient-glow: radial-gradient(ellipse 70% 60% at 50% -20%, rgba(99, 102, 241, 0.25) 0%, transparent 70%);

    --color-success: #34d399;
    --color-success-bg: rgba(16, 185, 129, 0.15);
    --color-success-border: rgba(16, 185, 129, 0.35);

    --color-danger: #f87171;
    --color-danger-bg: rgba(239, 68, 68, 0.15);
    --color-danger-border: rgba(239, 68, 68, 0.35);

    --color-warning: #fbbf24;
    --color-warning-bg: rgba(245, 158, 11, 0.15);
    --color-warning-border: rgba(245, 158, 11, 0.35);

    --color-border: #1f293d;
    --color-border-hover: #334155;

    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.25);

    --header-height: 72px;
    --max-content-width: 1240px;
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Mode Overrides */
[data-theme="light"] {
    --color-bg-body: #f8fafc;
    --color-bg-surface: #ffffff;
    --color-bg-subtle: #f1f5f9;
    --color-bg-muted: #e2e8f0;
    --color-bg-surface-rgb: 255, 255, 255;
    
    --color-text-main: #0f172a;
    --color-text-muted: #475569;
    --color-text-subtle: #64748b;
    --color-text-inverse: #ffffff;

    --color-primary: #4f46e5;
    --color-primary-hover: #4338ca;
    --color-primary-subtle: #eef2ff;
    --color-primary-border: #c7d2fe;
    --color-accent: #0891b2;

    --gradient-primary: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
    --gradient-glow: radial-gradient(ellipse 70% 60% at 50% -20%, rgba(79, 70, 229, 0.12) 0%, transparent 70%);

    --color-success: #15803d;
    --color-success-bg: #f0fdf4;
    --color-success-border: #bbf7d0;

    --color-danger: #b91c1c;
    --color-danger-bg: #fef2f2;
    --color-danger-border: #fecaca;

    --color-warning: #b45309;
    --color-warning-bg: #fffbeb;
    --color-warning-border: #fde68a;

    --color-border: #e2e8f0;
    --color-border-hover: #cbd5e1;

    --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
    --shadow-glow: 0 0 25px rgba(79, 70, 229, 0.18);
}

/* 2. Global Resets & Accessibility */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    line-height: 1.5;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-bg-body);
    color: var(--color-text-main);
    font-family: var(--font-sans);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.25s ease, color 0.25s ease;
}

/* Accessible focus ring for keyboard navigation */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Skip link */
.skip-link {
    position: absolute;
    top: -9999px;
    left: 1rem;
    background: var(--color-primary);
    color: #ffffff;
    padding: 0.75rem 1.25rem;
    font-weight: 600;
    z-index: 9999;
    border-radius: var(--radius-md);
    text-decoration: none;
    box-shadow: var(--shadow-lg);
    transition: top 0.2s ease;
}

.skip-link:focus {
    top: 1rem;
}

/* Screen-Reader Only Accessibility Utility (WCAG compliant) */
.sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* Core Container */
.container {
    width: 100%;
    max-width: var(--max-content-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
}

/* 3. Site Header & Glassmorphic Navigation */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(var(--color-bg-surface-rgb), 0.88);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    height: var(--header-height);
    transition: background 0.25s ease, border-color 0.25s ease;
}

.header-container {
    max-width: var(--max-content-width);
    margin: 0 auto;
    padding: 0 1.25rem;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

/* Brand Logo */
.site-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--color-text-main);
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast);
}

.site-logo:hover .logo-icon {
    transform: scale(1.05);
}

.logo-text {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-title {
    font-size: 1.2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--color-text-main);
}

.logo-badge {
    background: var(--gradient-primary);
    color: #ffffff;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.18rem 0.5rem;
    border-radius: 9999px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.35);
}

/* Search Box */
.header-search-wrap {
    flex: 1;
    max-width: 440px;
    position: relative;
}

.search-input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: 0.85rem;
    color: var(--color-text-subtle);
    pointer-events: none;
    display: flex;
}

.search-input {
    width: 100%;
    height: 42px;
    padding: 0 2.5rem 0 2.5rem;
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    color: var(--color-text-main);
    transition: all var(--transition-fast);
}

.search-input:focus {
    background: var(--color-bg-surface);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-subtle), var(--shadow-glow);
}

.search-shortcut {
    position: absolute;
    right: 0.75rem;
    background: var(--color-bg-muted);
    border: 1px solid var(--color-border);
    color: var(--color-text-subtle);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-family: var(--font-mono);
    padding: 0.1rem 0.4rem;
    pointer-events: none;
}

/* Search Dropdown Results */
.search-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    right: 0;
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    max-height: 380px;
    overflow-y: auto;
    z-index: 200;
}

.search-dropdown.hidden {
    display: none;
}

.search-item {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.75rem 1rem;
    text-decoration: none;
    color: var(--color-text-main);
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition-fast);
}

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

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

.search-item-icon {
    color: var(--color-primary);
    display: flex;
    flex-shrink: 0;
}

.search-item-info {
    display: flex;
    flex-direction: column;
}

.search-item-title {
    font-weight: 600;
    font-size: 0.925rem;
}

.search-item-desc {
    font-size: 0.775rem;
    color: var(--color-text-muted);
}

.search-no-results {
    padding: 1.25rem;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* Navigation Menu */
.site-nav {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 0.5rem;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 0.85rem;
    font-size: 0.925rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-decoration: none;
    border-radius: var(--radius-md);
    border: none;
    background: transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-link:hover, .nav-link:focus, .nav-link.active {
    color: var(--color-primary);
    background: var(--color-primary-subtle);
}

/* Dropdown */
.nav-item.has-dropdown {
    position: relative;
}

.dropdown-chevron {
    transition: transform var(--transition-fast);
}

.dropdown-toggle[aria-expanded="true"] .dropdown-chevron {
    transform: rotate(180deg);
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    width: 320px;
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 0.75rem;
    z-index: 150;
}

.dropdown-menu.show {
    display: block;
    animation: menu-slide-in 0.2s ease-out;
}

@keyframes menu-slide-in {
    from {
        opacity: 0;
        transform: translateY(-6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dropdown-heading {
    display: block;
    font-size: 0.725rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-subtle);
    padding: 0.4rem 0.5rem 0.2rem;
}

.dropdown-divider {
    height: 1px;
    background: var(--color-border);
    margin: 0.5rem 0;
}

.dropdown-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.6rem 0.75rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--color-text-main);
    transition: background var(--transition-fast);
}

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

.dropdown-item .item-icon {
    color: var(--color-primary);
    margin-top: 2px;
}

.dropdown-item .item-title {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
}

.dropdown-item .item-desc {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* Header Actions (Theme Toggle + Mobile Nav) */
.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    color: var(--color-primary);
    border-color: var(--color-primary-border);
    background: var(--color-primary-subtle);
    transform: translateY(-1px);
}

/* Theme Icon Visibility based on active data-theme */
[data-theme="dark"] .theme-icon-moon {
    display: none;
}
[data-theme="dark"] .theme-icon-sun {
    display: block;
    color: #f59e0b;
}

[data-theme="light"] .theme-icon-sun {
    display: none;
}
[data-theme="light"] .theme-icon-moon {
    display: block;
    color: var(--color-primary);
}

/* Mobile Toggle */
.mobile-nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 40px;
    height: 40px;
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 9px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.mobile-nav-toggle:hover {
    border-color: var(--color-primary-border);
}

.toggle-bar {
    width: 100%;
    height: 2px;
    background-color: var(--color-text-main);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* 4. Breadcrumbs */
.breadcrumb-container {
    padding-top: 1rem;
    padding-bottom: 0.5rem;
}

.breadcrumbs {
    font-size: 0.85rem;
    color: var(--color-text-subtle);
}

.breadcrumb-list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    list-style: none;
    gap: 0.5rem;
}

.breadcrumb-item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.breadcrumb-item a {
    color: var(--color-text-muted);
    text-decoration: none;
}

.breadcrumb-item a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

.breadcrumb-current {
    color: var(--color-text-main);
    font-weight: 600;
}

.breadcrumb-sep {
    color: var(--color-text-subtle);
}

/* 5. Main Content Area */
.main-content {
    flex: 1;
    padding-bottom: 4rem;
}

.page-header {
    padding: 2.5rem 0 1.5rem;
}

.page-title {
    font-size: 2.25rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.03em;
    color: var(--color-text-main);
    margin-bottom: 0.5rem;
}

.page-description {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-width: 800px;
    line-height: 1.6;
}

/* 6. Typography & Content Prose */
.prose {
    color: var(--color-text-muted);
    line-height: 1.7;
    font-size: 1rem;
}

.prose h1, .prose h2, .prose h3, .prose h4 {
    color: var(--color-text-main);
    font-weight: 700;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.prose h2 {
    font-size: 1.5rem;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.5rem;
}

.prose h3 {
    font-size: 1.25rem;
}

.prose p {
    margin-bottom: 1rem;
}

.prose ul, .prose ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}

.prose li {
    margin-bottom: 0.35rem;
}

.prose a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}

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

.prose code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    padding: 0.15rem 0.35rem;
    border-radius: var(--radius-sm);
    color: var(--color-accent);
}

.prose pre {
    background: #090d16;
    color: #f8fafc;
    padding: 1.25rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

.prose pre code {
    background: transparent;
    border: none;
    padding: 0;
    color: inherit;
}

/* Callout Boxes */
.callout {
    padding: 1.1rem 1.35rem;
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
    border-left: 4px solid;
    font-size: 0.95rem;
}

.callout-info {
    background: var(--color-primary-subtle);
    border-color: var(--color-primary);
    color: var(--color-text-main);
}

.callout-warning {
    background: var(--color-warning-bg);
    border-color: var(--color-warning);
    color: var(--color-text-main);
}

.callout-success {
    background: var(--color-success-bg);
    border-color: var(--color-success);
    color: var(--color-text-main);
}

/* 7. Homepage Components */
.hero-section {
    padding: 4.5rem 0 3.5rem;
    position: relative;
    overflow: hidden;
    text-align: center;
    background: var(--color-bg-body);
    border-bottom: 1px solid var(--color-border);
}

.hero-glow-backdrop {
    position: absolute;
    top: -120px;
    left: 50%;
    transform: translateX(-50%);
    width: 850px;
    height: 450px;
    background: var(--gradient-glow);
    pointer-events: none;
    z-index: 0;
}

.hero-section .container {
    position: relative;
    z-index: 1;
}

.hero-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background: var(--color-primary-subtle);
    border: 1px solid var(--color-primary-border);
    color: var(--color-primary);
    font-size: 0.825rem;
    font-weight: 700;
    padding: 0.35rem 0.95rem;
    border-radius: 9999px;
    margin-bottom: 1.5rem;
    letter-spacing: 0.02em;
    box-shadow: 0 2px 10px rgba(99, 102, 241, 0.15);
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-success);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    animation: pulse-green 2s infinite;
}

@keyframes pulse-green {
    0% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    }
    70% {
        transform: scale(1);
        box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
    }
    100% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
    }
}

.hero-title {
    font-size: 3.25rem;
    font-weight: 800;
    letter-spacing: -0.035em;
    line-height: 1.15;
    margin-bottom: 1.25rem;
    max-width: 950px;
    margin-left: auto;
    margin-right: auto;
    color: var(--color-text-main);
}

[data-theme="dark"] .hero-title {
    background: linear-gradient(135deg, #ffffff 20%, #cbd5e1 60%, #818cf8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

[data-theme="light"] .hero-title {
    background: linear-gradient(135deg, #0f172a 30%, #4338ca 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    max-width: 740px;
    margin: 0 auto 2.25rem;
    line-height: 1.6;
}

.hero-features {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-weight: 600;
}

.feature-item svg {
    color: var(--color-success);
}

/* Tools Catalog Section & Category Filters */
.tools-section {
    padding: 3.5rem 0;
}

.section-header {
    margin-bottom: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    flex-wrap: wrap;
    gap: 1.25rem;
}

.section-title {
    font-size: 1.85rem;
    font-weight: 800;
    color: var(--color-text-main);
    letter-spacing: -0.025em;
}

.section-subtitle {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-top: 0.25rem;
}

.category-filters {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.filter-tab {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.45rem 0.9rem;
    border-radius: 9999px;
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-tab:hover {
    border-color: var(--color-primary-border);
    color: var(--color-text-main);
    background: var(--color-bg-subtle);
}

.filter-tab.active {
    background: var(--color-primary-subtle);
    color: var(--color-primary);
    border-color: var(--color-primary-border);
    box-shadow: 0 0 0 1px var(--color-primary-border);
}

.filter-tab .tab-count {
    font-size: 0.75rem;
    padding: 0.1rem 0.45rem;
    border-radius: 9999px;
    background: var(--color-bg-subtle);
    color: inherit;
}

.filter-tab.active .tab-count {
    background: var(--color-primary);
    color: #ffffff;
}

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.5rem;
}

.tool-card {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 1.6rem;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow-sm);
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.25s ease;
}

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

.tool-card:hover::before {
    opacity: 1;
}

.tool-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.1rem;
}

.tool-card-category {
    font-size: 0.725rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-text-subtle);
}

.tool-card-badge {
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.2rem 0.55rem;
    border-radius: 9999px;
    background: var(--color-primary-subtle);
    color: var(--color-primary);
    border: 1px solid var(--color-primary-border);
}

.tool-card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.85rem;
}

.tool-card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    background: var(--color-primary-subtle);
    border: 1px solid var(--color-primary-border);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: transform 0.25s ease, background 0.25s ease, color 0.25s ease;
}

.tool-card:hover .tool-card-icon {
    transform: scale(1.08);
    background: var(--gradient-primary);
    color: #ffffff;
    border-color: transparent;
}

.tool-card-title {
    font-size: 1.18rem;
    font-weight: 700;
    color: var(--color-text-main);
    line-height: 1.3;
    letter-spacing: -0.015em;
}

.tool-card-desc {
    font-size: 0.88rem;
    color: var(--color-text-muted);
    line-height: 1.55;
    margin-bottom: 1.25rem;
    flex-grow: 1;
}

.tool-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
}

.tool-card-footer .arrow-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--color-primary-subtle);
    transition: transform 0.25s ease, background 0.25s ease, color 0.25s ease;
}

.tool-card:hover .tool-card-footer .arrow-wrap {
    transform: translateX(4px);
    background: var(--color-primary);
    color: #ffffff;
}

/* 8. FAQ Accordion & Semantic Schema */
.faq-section {
    margin-top: 3.5rem;
    padding-top: 2.5rem;
    border-top: 1px solid var(--color-border);
}

.faq-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--color-text-main);
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.faq-item {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.faq-item:hover {
    border-color: var(--color-primary-border);
}

.faq-question {
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    padding: 1.1rem 1.35rem;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-text-main);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.faq-question:hover {
    background: var(--color-bg-subtle);
}

.faq-chevron {
    transition: transform var(--transition-fast);
    flex-shrink: 0;
    color: var(--color-text-subtle);
}

.faq-item.open .faq-chevron {
    transform: rotate(180deg);
}

.faq-answer {
    display: none;
    padding: 0 1.35rem 1.35rem;
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.65;
}

.faq-item.open .faq-answer {
    display: block;
}

/* 9. Related Tools Component */
.related-tools-section {
    margin-top: 3.5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.related-tools-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
}

.related-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
}

/* 10. Footer */
.site-footer {
    background: #070a12;
    color: #94a3b8;
    padding: 4.5rem 0 2rem;
    border-top: 1px solid #1a2234;
    margin-top: auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.footer-logo-title {
    color: #f8fafc;
    font-size: 1.2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.footer-desc {
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: 1.25rem;
    color: #94a3b8;
}

.privacy-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: #111827;
    border: 1px solid #1f293d;
    padding: 0.45rem 0.85rem;
    border-radius: var(--radius-md);
    font-size: 0.775rem;
    color: var(--color-accent);
    font-weight: 600;
}

.footer-heading {
    color: #f8fafc;
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    letter-spacing: -0.01em;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.footer-links a {
    color: #94a3b8;
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover, .footer-links a:focus {
    color: var(--color-accent);
    text-decoration: underline;
}

.footer-subtext {
    font-size: 0.85rem;
    line-height: 1.6;
    color: #64748b;
    margin-bottom: 1rem;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--color-success);
    font-weight: 600;
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--color-success);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--color-success);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid #1a2234;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.85rem;
}

.footer-bottom a {
    color: #94a3b8;
    text-decoration: none;
}

.footer-bottom a:hover {
    color: #f8fafc;
    text-decoration: underline;
}

.footer-bottom-links {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.footer-bottom-links .sep {
    color: #334155;
}

/* 11. Toast System */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 9999;
    pointer-events: none;
}

.toast {
    pointer-events: auto;
    background: #111827;
    color: #f8fafc;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    font-size: 0.875rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    animation: toast-in 0.25s ease-out;
    border: 1px solid var(--color-border);
}

.toast.toast-success {
    border-color: var(--color-success);
}

.toast.toast-error {
    border-color: var(--color-danger);
}

@keyframes toast-in {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 12. Ad Placeholder */
.ad-placeholder-wrapper {
    margin: 2rem 0;
    text-align: center;
}

.ad-placeholder {
    background: var(--color-bg-subtle);
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 90px;
}

.ad-placeholder-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-subtle);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* 13. Responsive Breakpoints */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }
    .hero-title {
        font-size: 2.6rem;
    }
}

@media (max-width: 768px) {
    .header-search-wrap {
        order: 3;
        max-width: 100%;
        width: 100%;
    }
    .header-container {
        flex-wrap: wrap;
        height: auto;
        padding-top: 0.75rem;
        padding-bottom: 0.75rem;
    }
    .mobile-nav-toggle {
        display: flex;
    }
    .site-nav {
        display: none;
        width: 100%;
        order: 4;
        margin-top: 0.5rem;
    }
    .site-nav.mobile-active {
        display: block;
    }
    .nav-list {
        flex-direction: column;
        align-items: stretch;
        gap: 0.25rem;
        padding: 0.5rem 0;
        border-top: 1px solid var(--color-border);
    }
    .dropdown-menu {
        position: static;
        width: 100%;
        box-shadow: none;
        border: 1px solid var(--color-border);
        margin-top: 0.5rem;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .hero-title {
        font-size: 2rem;
    }
    .hero-subtitle {
        font-size: 1.05rem;
    }
    .tools-grid {
        grid-template-columns: 1fr;
    }
    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }
}