/* -----------------------------------------------------------------------------
 * ToolsHub Master Stylesheet
 * Ultra-fast, zero-dependency, responsive CSS design system
 * -------------------------------------------------------------------------- */

:root {
    --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-code: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;

    /* Light Theme Palette */
    --bg-page: #f8fafc;
    --bg-surface: #ffffff;
    --bg-subtle: #f1f5f9;
    --bg-card: #ffffff;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --text-light: #94a3b8;

    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --primary-border: #bfdbfe;

    --success: #10b981;
    --success-bg: #ecfdf5;
    --warning: #f59e0b;
    --error: #ef4444;
    --error-bg: #fef2f2;

    --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);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    --container-max: 1200px;
}

/* Dark Theme Overrides */
body.theme-dark {
    --bg-page: #0f172a;
    --bg-surface: #1e293b;
    --bg-subtle: #182234;
    --bg-card: #1e293b;
    --border-color: #334155;
    --border-hover: #475569;

    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-light: #64748b;

    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --primary-light: #172554;
    --primary-border: #1e40af;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
}

/* Base Resets */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-page);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.2s ease, color 0.2s ease;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.15s ease;
}

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

/* Top Progress Bar */
.progress-bar-top {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, #3b82f6, #10b981);
    width: 0%;
    z-index: 9999;
    transition: width 0.3s ease;
}

/* Layout Wrapper */
.section-container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.25rem;
}

.main-content-wrapper {
    flex: 1;
    padding-bottom: 4rem;
}

/* Header */
.site-header {
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.header-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0.85rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--primary), #6366f1);
    color: #fff;
    font-size: 1.25rem;
    border-radius: var(--radius-md);
}

.brand-titles {
    display: flex;
    flex-direction: column;
}

.site-title {
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--text-primary);
    line-height: 1.2;
}

.site-subtitle {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Header Search */
.header-search-wrap {
    flex: 1;
    max-width: 460px;
    position: relative;
}

.header-search-form {
    display: flex;
    align-items: center;
    position: relative;
}

.header-search-input {
    width: 100%;
    padding: 0.6rem 2.6rem 0.6rem 1rem;
    border: 1px solid var(--border-color);
    background-color: var(--bg-subtle);
    color: var(--text-primary);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    outline: none;
    transition: all 0.2s ease;
}

.header-search-input:focus {
    border-color: var(--primary);
    background-color: var(--bg-surface);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.header-search-btn {
    position: absolute;
    right: 10px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
}

/* Search Dropdown */
.search-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-top: 6px;
    box-shadow: var(--shadow-lg);
    max-height: 360px;
    overflow-y: auto;
    z-index: 1050;
    display: none;
}

.search-dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: background 0.15s ease;
}

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

.search-dropdown-item:hover {
    background: var(--bg-subtle);
}

.search-item-icon {
    font-size: 1.25rem;
}

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

.search-item-title {
    font-weight: 600;
    font-size: 0.9rem;
}

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

/* Header Nav */
.header-nav {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.4rem 0.6rem;
    border-radius: var(--radius-sm);
}

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

.nav-dropdown {
    position: relative;
}

.nav-dropdown-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0.4rem 0.6rem;
    border-radius: var(--radius-sm);
}

.nav-dropdown:hover .nav-dropdown-content {
    display: block;
}

.nav-dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    width: 380px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    box-shadow: var(--shadow-lg);
    z-index: 1050;
}

.dropdown-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.4rem;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.85rem;
}

.dropdown-item:hover {
    background: var(--bg-subtle);
}

.cat-count {
    margin-left: auto;
    font-size: 0.7rem;
    background: var(--bg-subtle);
    padding: 2px 6px;
    border-radius: var(--radius-full);
    color: var(--text-muted);
}

.theme-toggle-btn, .mobile-toggle-btn {
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 38px;
    height: 38px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.theme-icon-dark { display: none; }
body.theme-dark .theme-icon-light { display: none; }
body.theme-dark .theme-icon-dark { display: inline-block; }

.mobile-toggle-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    width: 38px;
    height: 38px;
    border-radius: var(--radius-full);
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.mobile-toggle-btn span {
    width: 18px;
    height: 2px;
    background: var(--text-primary);
}

/* Mobile Drawer (Hidden offscreen by default on desktop) */
.mobile-drawer {
    position: fixed;
    top: 0;
    left: -320px;
    width: 300px;
    height: 100vh;
    background: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    z-index: 99999;
    display: flex;
    flex-direction: column;
    transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    visibility: hidden;
}

.mobile-drawer.open {
    left: 0;
    visibility: visible;
}

.mobile-drawer-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(15, 23, 42, 0.6);
    z-index: 99998;
    display: none;
    backdrop-filter: blur(3px);
}

.mobile-drawer-backdrop.open {
    display: block;
}

.drawer-header {
    padding: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.close-drawer-btn {
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    font-size: 1.1rem;
    color: var(--text-muted);
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-drawer-btn:hover {
    color: var(--text-primary);
    border-color: var(--primary);
}

.drawer-content {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.drawer-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.95rem;
}

.drawer-link:hover {
    background: var(--primary-light);
    color: var(--primary);
}

.drawer-section-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 700;
    color: var(--text-muted);
    margin: 1.25rem 0 0.5rem;
    padding-left: 0.5rem;
}

.drawer-categories {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.drawer-cat-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.55rem 0.85rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.drawer-cat-item:hover {
    background: var(--bg-subtle);
    color: var(--primary);
}

/* Hero Section */
.hero-section {
    padding: 3.5rem 1.25rem 2.5rem;
    text-align: center;
    background: linear-gradient(180deg, var(--bg-surface) 0%, var(--bg-page) 100%);
    border-bottom: 1px solid var(--border-color);
}

.hero-container {
    max-width: 820px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 700;
    padding: 0.35rem 1rem;
    border-radius: var(--radius-full);
    margin-bottom: 1rem;
    border: 1px solid var(--primary-border);
}

.hero-title {
    font-size: 2.75rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.15;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.hero-search-box {
    position: relative;
    max-width: 680px;
    margin: 0 auto 1.5rem;
}

.hero-search-form {
    display: flex;
    align-items: center;
    background: var(--bg-surface);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: 0.4rem 0.4rem 0.4rem 1.25rem;
    box-shadow: var(--shadow-md);
    transition: border-color 0.2s ease;
}

.hero-search-form:focus-within {
    border-color: var(--primary);
}

.hero-search-input {
    flex: 1;
    border: none;
    background: transparent;
    outline: none;
    font-size: 1.05rem;
    color: var(--text-primary);
    padding: 0.5rem;
}

.hero-search-btn {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    cursor: pointer;
    font-size: 0.95rem;
    transition: background 0.15s ease;
}

.hero-search-btn:hover {
    background: var(--primary-hover);
}

.quick-tags {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tags-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 600;
}

.tag-pill {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.15s ease;
}

.tag-pill:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

/* Sections */
.categories-section, .popular-tools-section, .featured-tools-section, .features-value-section {
    padding: 3rem 0;
}

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

.section-title {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-primary);
}

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

.view-all-link {
    font-weight: 600;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Category Grid */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.25rem;
}

.category-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.category-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.cat-card-icon {
    font-size: 2rem;
}

.cat-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
}

.cat-card-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.35rem;
}

.cat-card-badge {
    display: inline-block;
    margin-top: auto;
    font-size: 0.75rem;
    color: var(--primary);
    font-weight: 600;
}

/* Tools Grid & Card Component */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.tool-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.tool-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.85rem;
}

.tool-card-icon {
    font-size: 1.6rem;
}

.badge {
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.2rem 0.55rem;
    border-radius: var(--radius-full);
}

.badge-featured {
    background: #fef3c7;
    color: #92400e;
}

.badge-popular {
    background: #fee2e2;
    color: #991b1b;
}

.tool-card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.4rem;
}

.tool-card-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.tool-card-footer {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.use-tool-btn {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* AdSense Slot Styles */
.ad-placement-wrapper {
    max-width: var(--container-max);
    margin: 1.5rem auto;
    padding: 0 1.25rem;
}

.ad-container-inner {
    background: var(--bg-surface);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    text-align: center;
    min-height: 100px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.ad-label {
    font-size: 0.65rem;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.ad-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--text-muted);
}

.placeholder-icon {
    font-size: 1.25rem;
}

.placeholder-title {
    font-weight: 600;
    font-size: 0.85rem;
}

.placeholder-sub {
    font-size: 0.7rem;
}

/* Tool Interactive Workspace Card */
.tool-page-wrapper {
    padding: 1.5rem 0 3rem;
}

.tool-header-block {
    margin: 1rem 0 1.5rem;
}

.tool-title-row {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    margin-bottom: 0.75rem;
}

.tool-main-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 2rem;
    box-shadow: var(--shadow-sm);
    flex-shrink: 0;
}

.tool-page-title {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.2;
}

.tool-page-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.tool-meta-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tool-cat-tag, .tool-free-tag, .tool-privacy-tag {
    font-size: 0.8rem;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-weight: 600;
}

.tool-cat-tag {
    background: var(--primary-light);
    color: var(--primary);
    border: 1px solid var(--primary-border);
}

.tool-free-tag {
    background: var(--success-bg);
    color: var(--success);
}

.tool-privacy-tag {
    background: var(--bg-subtle);
    color: var(--text-muted);
}

/* Workspace Card */
.tool-workspace-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    margin-bottom: 2rem;
}

.workspace-header {
    background: var(--bg-subtle);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.workspace-status {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success);
}

.tool-action-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    cursor: pointer;
    font-weight: 500;
}

.tool-action-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.workspace-body {
    padding: 1.5rem;
}

/* Forms & Textareas */
.input-label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.tool-textarea {
    width: 100%;
    padding: 0.85rem;
    background: var(--bg-page);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    line-height: 1.5;
    outline: none;
    resize: vertical;
    transition: border-color 0.2s ease;
}

.tool-textarea.code-font {
    font-family: var(--font-code);
    font-size: 0.9rem;
}

.tool-textarea:focus {
    border-color: var(--primary);
    background: var(--bg-surface);
}

.tool-controls-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1rem;
}

.btn-primary, .btn-secondary, .btn-success {
    padding: 0.7rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: all 0.15s ease;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-hover);
    color: #fff;
}

.btn-secondary {
    background: var(--bg-subtle);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-success {
    background: var(--success);
    color: #fff;
}

/* Results & Stat Counters */
.tool-results-panel {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.results-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.stats-counter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.stat-card {
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    text-align: center;
}

.stat-num {
    display: block;
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.1;
}

.stat-lbl {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    margin-top: 0.25rem;
}

/* Dropzone */
.dropzone-area {
    border: 2px dashed var(--border-hover);
    border-radius: var(--radius-lg);
    padding: 3rem 1.5rem;
    text-align: center;
    background: var(--bg-page);
    cursor: pointer;
    transition: all 0.2s ease;
}

.dropzone-area:hover, .dropzone-area.drag-over {
    border-color: var(--primary);
    background: var(--primary-light);
}

.dropzone-icon {
    font-size: 3.5rem;
    display: block;
    margin-bottom: 0.75rem;
}

.dropzone-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.dropzone-subtitle {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
    margin-bottom: 1.25rem;
}

.file-input-hidden {
    display: none;
}

.image-preview-container img {
    max-width: 100%;
    max-height: 320px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

/* Calculator Grid */
.calc-form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
}

.form-full-row {
    grid-column: 1 / -1;
    margin-top: 0.5rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-page);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
}

.form-control:focus {
    border-color: var(--primary);
    background: var(--bg-surface);
}

.calc-results-card {
    margin-top: 1.5rem;
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem;
}

.calc-metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-top: 0.75rem;
}

.metric-box {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1rem;
    text-align: center;
}

.metric-val {
    display: block;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
}

.metric-lbl {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
}

/* Converter Box Grid */
.converter-box-grid {
    display: grid;
    grid-template-columns: 1fr 60px 1fr;
    gap: 1rem;
    align-items: center;
}

.swap-units-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary-light);
    border: 1px solid var(--primary-border);
    color: var(--primary);
    font-size: 1.25rem;
    cursor: pointer;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* QR Code Grid */
.qr-builder-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.qr-canvas-box {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 280px;
}

.qr-canvas-box img {
    max-width: 240px;
    height: auto;
}

.qr-downloads-row {
    margin-top: 1rem;
    display: flex;
    gap: 0.5rem;
}

/* Guide & SEO Articles */
.tool-guide-article, .seo-guide-section, .tool-faq-section {
    margin: 2.5rem 0;
}

.guide-card, .faq-card, .legal-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
}

.guide-card h2, .faq-section-title, .legal-card h1 {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.guide-card h3, .legal-card h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 1.5rem 0 0.75rem;
}

.guide-steps-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin: 1.5rem 0;
}

.step-item {
    display: flex;
    gap: 1rem;
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem;
}

.step-num {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.step-desc h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.step-desc p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* FAQ Accordion */
.faq-accordion-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1rem;
}

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

.faq-question {
    padding: 1rem 1.25rem;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.faq-answer {
    padding: 0 1.25rem 1rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Breadcrumbs */
.breadcrumbs-nav {
    margin-bottom: 1rem;
}

.breadcrumbs-list {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    list-style: none;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.breadcrumb-separator {
    color: var(--text-light);
}

.breadcrumb-item.active {
    color: var(--text-primary);
    font-weight: 600;
}

/* Filter Tabs */
.category-filter-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.filter-tab-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
}

.filter-tab-btn:hover, .filter-tab-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.category-group-block {
    margin-bottom: 3.5rem;
}

.category-group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.75rem;
}

.cat-group-title-wrap {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.cat-group-icon {
    font-size: 1.75rem;
}

.cat-group-title {
    font-size: 1.5rem;
    font-weight: 800;
}

.cat-group-badge {
    font-size: 0.75rem;
    background: var(--primary-light);
    color: var(--primary);
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-full);
    font-weight: 700;
}

/* Footer */
.site-footer {
    background: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 2rem;
    margin-top: auto;
}

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

.footer-brand-col {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

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

.footer-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer-trust-badges {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.trust-badge {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
}

.footer-links-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.footer-heading {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.footer-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-list a {
    color: var(--text-secondary);
    font-size: 0.85rem;
    transition: color 0.15s ease;
}

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

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.copyright-text {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-bottom-links {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 99999;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast-msg {
    background: #1e293b;
    color: #ffffff;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    box-shadow: var(--shadow-lg);
    animation: slideInUp 0.3s ease;
}

@keyframes slideInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive Breakpoints */
@media (max-width: 992px) {
    .hero-title { font-size: 2.25rem; }
    .footer-top { grid-template-columns: 1fr; gap: 2rem; }
    .footer-links-grid { grid-template-columns: 1fr 1fr; }
    .converter-box-grid { grid-template-columns: 1fr; }
    .qr-builder-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .header-search-wrap { display: none; }
    .header-nav { display: none; }
    .mobile-toggle-btn { display: flex; }
    .hero-title { font-size: 1.85rem; }
    .hero-subtitle { font-size: 1rem; }
    .tool-title-row { flex-direction: column; align-items: flex-start; }
    .tool-page-title { font-size: 1.75rem; }
    .footer-links-grid { grid-template-columns: 1fr; }
}