/*
Theme Name: UtilityLab
Theme URI: https://utilora.ru
Author: UtilityLab Engineering Team
Author URI: https://utilora.ru
Description: High-performance, lightweight, SEO-first presentation theme for the UtilityLab computational utility platform.
Version: 1.1.0
Requires at least: 6.6
Tested up to: 7.1
Requires PHP: 8.3
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: utilitylab
*/

/* ==========================================================================
   1. Design Tokens & CSS Custom Properties
   ========================================================================== */
:root {
    /* Brand Colors */
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-primary-light: #eff6ff;
    --color-primary-border: #bfdbfe;

    /* Semantic Feedback */
    --color-success: #10b981;
    --color-success-bg: #ecfdf5;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-danger-bg: #fef2f2;

    /* Neutrals & Slate */
    --color-text-main: #0f172a;
    --color-text-muted: #475569;
    --color-text-subtle: #64748b;
    --color-bg-body: #f8fafc;
    --color-bg-surface: #ffffff;
    --color-bg-subtle: #f1f5f9;
    --color-border: #e2e8f0;
    --color-border-hover: #cbd5e1;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;

    /* Layout & Spacing */
    --container-max-w: 1200px;
    --container-tool-w: 960px;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.03);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   2. Modern Reset & Base Rules
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.5;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
    color: var(--color-text-main);
    background-color: var(--color-bg-body);
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

input, button, select, textarea {
    font: inherit;
    color: inherit;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

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

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -9999px;
    left: 1rem;
    background: var(--color-primary);
    color: #ffffff;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    z-index: 1000;
}
.skip-link:focus {
    top: 1rem;
}

/* ==========================================================================
   3. Layout Containers & Buttons
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--container-max-w);
    margin-inline: auto;
    padding-inline: 1.5rem;
}

.container-narrow {
    max-width: var(--container-tool-w);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: var(--text-sm);
    font-weight: 600;
    padding: 0.65rem 1.25rem;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
}
.btn:hover {
    text-decoration: none;
}
.btn-primary {
    background: var(--color-primary);
    color: #ffffff;
}
.btn-primary:hover {
    background: var(--color-primary-hover);
    color: #ffffff;
}
.btn-secondary {
    background: var(--color-bg-surface);
    color: var(--color-text-main);
    border-color: var(--color-border);
}
.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}
.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary-border);
}
.btn-outline:hover {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
}

/* Section Header Shared */
.section-header {
    margin-bottom: 1.5rem;
}
.section-header-flex {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.section-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-text-main);
    letter-spacing: -0.02em;
}
.section-subtitle {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-top: 0.25rem;
}

/* ==========================================================================
   4. Site Header, Navigation & Mobile Drawer
   ========================================================================== */
.site-header {
    background-color: var(--color-bg-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4.25rem;
    gap: 1.5rem;
}

.site-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: var(--text-xl);
    color: var(--color-text-main);
    text-decoration: none;
    flex-shrink: 0;
}
.site-brand:hover {
    text-decoration: none;
    color: var(--color-primary);
}

.brand-badge {
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: var(--text-xs);
    font-weight: 600;
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-primary-border);
}

.nav-desktop {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    list-style: none;
}
.nav-desktop a {
    color: var(--color-text-muted);
    font-weight: 500;
    font-size: var(--text-sm);
    text-decoration: none;
    transition: color var(--transition-fast);
}
.nav-desktop a:hover, .nav-desktop a.active {
    color: var(--color-primary);
}
.nav-desktop .nav-all-tools {
    font-weight: 600;
    color: var(--color-primary);
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-sm);
    background: var(--color-primary-light);
}

/* Header Quick Search */
.header-search {
    flex: 1;
    max-width: 280px;
    position: relative;
}
.quick-search-input {
    width: 100%;
    height: 2.375rem;
    padding: 0.4rem 1rem 0.4rem 2.25rem;
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
}
.quick-search-input:focus {
    outline: none;
    background: #ffffff;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}
.header-search svg {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-subtle);
    pointer-events: none;
}

/* Autocomplete Results Dropdown */
.search-dropdown-results {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    right: 0;
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    max-height: 380px;
    overflow-y: auto;
}
.search-result-item {
    display: block;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--color-border);
    text-decoration: none;
    color: inherit;
    transition: background var(--transition-fast);
}
.search-result-item:last-child {
    border-bottom: none;
}
.search-result-item:hover, .search-result-item.highlighted {
    background: var(--color-primary-light);
    text-decoration: none;
}
.search-res-title {
    font-weight: 600;
    font-size: var(--text-sm);
    color: var(--color-text-main);
}
.search-res-cat {
    font-size: var(--text-xs);
    color: var(--color-text-subtle);
    margin-top: 0.15rem;
}
.search-no-res {
    padding: 1rem;
    font-size: var(--text-sm);
    color: var(--color-text-subtle);
    text-align: center;
}

/* Language Switcher Badge */
.lang-switcher {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    padding: 0.25rem 0.65rem;
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--color-text-muted);
}
.lang-switcher svg {
    color: var(--color-text-subtle);
}
.lang-code.active {
    color: var(--color-primary);
}
.lang-code.disabled {
    color: var(--color-text-subtle);
    opacity: 0.6;
    cursor: default;
}
.lang-sep {
    color: var(--color-border);
}

/* Mobile Nav Toggle Button */
.mobile-nav-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--color-text-main);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
}
.mobile-nav-toggle:focus-visible {
    outline: 2px solid var(--color-primary);
}

/* Mobile Navigation Drawer */
.mobile-nav-drawer {
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-surface);
    padding: 1rem 0 1.5rem;
}
.mobile-search-wrap {
    margin-bottom: 1.25rem;
}
.mobile-search-form {
    display: flex;
    gap: 0.5rem;
}
.mobile-search-input {
    flex: 1;
    height: 2.75rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-subtle);
    font-size: var(--text-sm);
}
.mobile-search-btn {
    width: 2.75rem;
    height: 2.75rem;
    background: var(--color-primary);
    color: #ffffff;
    border: none;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}
.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.mobile-nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--color-text-main);
    font-weight: 500;
    font-size: var(--text-base);
    background: var(--color-bg-subtle);
}
.mobile-nav-item:hover {
    background: var(--color-primary-light);
    color: var(--color-primary);
    text-decoration: none;
}
.mobile-nav-item.highlight {
    background: var(--color-primary);
    color: #ffffff;
}

/* ==========================================================================
   5. Breadcrumbs
   ========================================================================== */
.breadcrumbs-nav {
    padding: 1rem 0;
    font-size: var(--text-sm);
    color: var(--color-text-subtle);
}
.breadcrumbs-list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    list-style: none;
}
.breadcrumbs-list li:not(:last-child)::after {
    content: "›";
    margin-left: 0.5rem;
    color: var(--color-border-hover);
}
.breadcrumbs-list a {
    color: var(--color-text-muted);
    text-decoration: none;
}
.breadcrumbs-list a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}
.breadcrumbs-list [aria-current="page"] {
    color: var(--color-text-main);
    font-weight: 500;
}

/* ==========================================================================
   6. Hero & In-Hero Search
   ========================================================================== */
.hero-section {
    padding: 3.5rem 0 2rem;
    text-align: center;
}
.hero-badge {
    display: inline-block;
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: var(--text-xs);
    font-weight: 700;
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-primary-border);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.hero-title {
    font-size: var(--text-4xl);
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--color-text-main);
    margin-bottom: 0.85rem;
    line-height: 1.2;
}
.hero-subtitle {
    font-size: var(--text-lg);
    color: var(--color-text-muted);
    max-width: 680px;
    margin-inline: auto;
    line-height: 1.6;
}

/* Hero Search Bar */
.hero-search-wrapper {
    max-width: 680px;
    margin: 2rem auto 0;
}
.hero-search-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}
.hero-search-input-wrap svg {
    position: absolute;
    left: 1.25rem;
    color: var(--color-text-subtle);
    pointer-events: none;
}
.hero-search-input {
    width: 100%;
    height: 3.5rem;
    padding: 0.5rem 8rem 0.5rem 3.25rem;
    background: var(--color-bg-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--text-base);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-fast);
}
.hero-search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.18);
}
.hero-search-btn {
    position: absolute;
    right: 0.5rem;
    height: 2.5rem;
    border-radius: var(--radius-full);
    padding-inline: 1.5rem;
}

/* Category Filter Pills */
.category-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
    margin: 1.25rem 0;
}
.category-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.45rem 1rem;
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-main);
    text-decoration: none;
    transition: all var(--transition-fast);
}
.category-pill svg {
    width: 16px;
    height: 16px;
    color: var(--color-text-subtle);
}
.category-pill:hover, .category-pill.active {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
    color: var(--color-primary);
    text-decoration: none;
}
.category-pill.active svg {
    color: var(--color-primary);
}

/* Trust Bar */
.trust-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem 2rem;
    margin: 2.5rem 0;
}
.trust-item {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}
.trust-item svg {
    color: var(--color-success);
    background: var(--color-success-bg);
    padding: 6px;
    border-radius: var(--radius-full);
    width: 32px;
    height: 32px;
    flex-shrink: 0;
}
.trust-item strong {
    display: block;
    font-size: var(--text-sm);
    color: var(--color-text-main);
}
.trust-item span {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

/* ==========================================================================
   7. Grids: Categories & Tools
   ========================================================================== */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0 3rem;
}
.category-card {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
}
.category-card:hover {
    border-color: var(--color-primary-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    text-decoration: none;
}
.category-card-icon {
    width: 3rem;
    height: 3rem;
    border-radius: var(--radius-md);
    background: var(--color-primary-light);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
}
.category-card-title {
    font-size: var(--text-xl);
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-text-main);
}
.category-card-desc {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: 1.25rem;
    flex: 1;
}
.category-card-meta {
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--color-primary);
}

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
    margin: 1.5rem 0 2.5rem;
}
.tool-card {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
}
.tool-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
    text-decoration: none;
}
.tool-card-badge {
    align-self: flex-start;
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-light);
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius-sm);
    margin-bottom: 0.5rem;
}
.tool-card-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text-main);
    margin-bottom: 0.4rem;
}
.tool-card-desc {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ==========================================================================
   8. Single Utility Tool Layout
   ========================================================================== */
.tool-header {
    margin-bottom: 2rem;
}
.tool-title {
    font-size: var(--text-3xl);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}
.tool-lead {
    font-size: var(--text-lg);
    color: var(--color-text-muted);
}

.calculator-app-card {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 2rem;
    margin-bottom: 2.5rem;
}

.calc-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}
@media (min-width: 768px) {
    .calc-grid {
        grid-template-columns: 1.2fr 1fr;
    }
}

.calc-form-group {
    margin-bottom: 1.25rem;
}
.calc-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--text-sm);
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--color-text-main);
}
.calc-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}
.calc-input {
    width: 100%;
    height: 3rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-bg-surface);
    font-size: var(--text-base);
    font-weight: 500;
    transition: all var(--transition-fast);
}
.calc-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}
.calc-input-addon {
    position: absolute;
    right: 0.75rem;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-subtle);
    pointer-events: none;
}

/* Results Display Box */
.calc-results-panel {
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 240px; /* Zero CLS pre-allocation */
}
.calc-result-item {
    margin-bottom: 1.25rem;
}
.calc-result-item:last-child {
    margin-bottom: 0;
}
.calc-result-label {
    font-size: var(--text-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-subtle);
    margin-bottom: 0.25rem;
}
.calc-result-value {
    font-size: var(--text-2xl);
    font-weight: 800;
    color: var(--color-primary);
    font-family: var(--font-mono);
}
.calc-result-value.large {
    font-size: var(--text-3xl);
}

/* Editorial & Instructions (SEO Body) */
.editorial-section {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-bottom: 2rem;
}
.editorial-content {
    color: var(--color-text-muted);
    line-height: 1.75;
    font-size: var(--text-base);
}
.editorial-content h2 {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-text-main);
    margin: 1.5rem 0 0.75rem;
}
.editorial-content h2:first-child {
    margin-top: 0;
}
.editorial-content p {
    margin-bottom: 1rem;
}
.editorial-content ul, .editorial-content ol {
    margin: 1rem 0 1.25rem 1.5rem;
}
.editorial-content li {
    margin-bottom: 0.5rem;
}

/* Formula Callout */
.formula-callout {
    background: var(--color-bg-subtle);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-sm);
    padding: 1rem 1.25rem;
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    color: var(--color-text-main);
    margin: 1.25rem 0;
    overflow-x: auto;
}

/* FAQ Accordion */
.faq-accordion {
    margin-top: 1rem;
}
.faq-item {
    border-bottom: 1px solid var(--color-border);
    padding: 1.25rem 0;
}
.faq-item:last-child {
    border-bottom: none;
}
.faq-item h3 {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-text-main);
    cursor: pointer;
    user-select: none;
}
.faq-item h3:hover {
    color: var(--color-primary);
}
.faq-item p {
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-top: 0.5rem;
}

/* ==========================================================================
   9. Search, 404 & Generic Pages
   ========================================================================== */
.page-header {
    padding: 1.5rem 0 2rem;
}
.page-title {
    font-size: var(--text-3xl);
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--color-text-main);
}
.page-subtitle {
    font-size: var(--text-base);
    color: var(--color-text-muted);
    margin-top: 0.5rem;
}

/* In-Page Search Refine */
.search-refine-wrap {
    max-width: 580px;
    margin-top: 1.25rem;
}
.search-refine-form {
    display: flex;
    gap: 0.5rem;
}
.search-refine-input {
    flex: 1;
    height: 3rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-surface);
    font-size: var(--text-base);
}
.search-refine-btn {
    height: 3rem;
}
.search-result-count {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-top: 0.25rem;
}

/* No Results & 404 Box */
.no-results-card, .not-found-wrapper {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    margin: 2rem 0;
}
.no-results-icon {
    width: 4rem;
    height: 4rem;
    margin: 0 auto 1.25rem;
    background: var(--color-bg-subtle);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-subtle);
}
.not-found-code {
    font-size: 5rem;
    font-weight: 900;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: 0.5rem;
}
.not-found-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-text-main);
    margin-bottom: 0.75rem;
}
.not-found-desc {
    font-size: var(--text-base);
    color: var(--color-text-muted);
    max-width: 560px;
    margin: 0 auto 1.5rem;
}
.not-found-search {
    max-width: 480px;
    margin: 0 auto 2rem;
}

/* Category Header Component */
.category-header-top {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

/* Pagination */
.pagination {
    margin: 2rem 0 3rem;
}
.nav-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
}
.page-numbers {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.5rem;
    height: 2.5rem;
    padding: 0.25rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-surface);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-main);
    text-decoration: none;
    transition: all var(--transition-fast);
}
.page-numbers.current {
    background: var(--color-primary);
    color: #ffffff;
    border-color: var(--color-primary);
}
.page-numbers:hover:not(.current) {
    border-color: var(--color-primary);
    color: var(--color-primary);
    text-decoration: none;
}

/* ==========================================================================
   10. Site Footer
   ========================================================================== */
.site-footer {
    background-color: #0f172a;
    color: #94a3b8;
    padding: 3.5rem 0 2rem;
    margin-top: auto;
    font-size: var(--text-sm);
}
.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2.5rem;
    margin-bottom: 2.5rem;
}
.footer-col.brand-col {
    grid-column: 1 / -1;
}
@media (min-width: 768px) {
    .footer-col.brand-col {
        grid-column: span 1;
    }
}
.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: var(--text-xl);
    font-weight: 700;
    text-decoration: none;
    margin-bottom: 0.75rem;
}
.footer-mission {
    font-size: var(--text-sm);
    color: #94a3b8;
    line-height: 1.6;
    margin-bottom: 1.25rem;
}
.footer-security-badges {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}
.security-badge {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: var(--text-xs);
    font-weight: 600;
    color: #34d399;
}
.footer-heading {
    color: #ffffff;
    font-size: var(--text-base);
    font-weight: 600;
    margin-bottom: 1rem;
}
.footer-links {
    list-style: none;
}
.footer-links li {
    margin-bottom: 0.5rem;
}
.footer-links a {
    color: #94a3b8;
    text-decoration: none;
}
.footer-links a:hover {
    color: #ffffff;
}
.footer-disclaimer {
    font-size: var(--text-xs);
    color: #64748b;
    line-height: 1.6;
}
.footer-bottom {
    border-top: 1px solid #1e293b;
    padding-top: 1.5rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    font-size: var(--text-xs);
}
.footer-bottom-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.meta-dot {
    color: #475569;
}
.back-to-top {
    color: #94a3b8;
    text-decoration: none;
    font-weight: 600;
}
.back-to-top:hover {
    color: #ffffff;
}

/* ==========================================================================
   11. Mobile Responsiveness & Breakpoints
   ========================================================================== */
@media (max-width: 900px) {
    .nav-desktop {
        display: none;
    }
    .mobile-nav-toggle {
        display: block;
    }
    .header-search {
        max-width: 200px;
    }
}

@media (max-width: 640px) {
    .header-search {
        display: none;
    }
    .hero-title {
        font-size: var(--text-3xl);
    }
    .hero-search-input {
        padding-right: 1rem;
        height: 3rem;
    }
    .hero-search-btn {
        display: none;
    }
    .tool-title {
        font-size: var(--text-2xl);
    }
    .calculator-app-card {
        padding: 1.25rem;
    }
    .category-grid, .tools-grid {
        grid-template-columns: 1fr;
    }
    .category-pills {
        justify-content: flex-start;
    }
    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
    }
}