/* ============================================================
   YouTube ToolKits - Red/Dark Theme
   Version: 2.0.0
   ============================================================ */

/* ============================================================
   CSS Variables - Red/Dark Color Scheme
   ============================================================ */
:root {
    /* Primary - Red Theme */
    --primary: #DC2626;
    --primary-dark: #B91C1C;
    --primary-light: #FEE2E2;
    --primary-hover: #EF4444;
    --primary-gradient: linear-gradient(135deg, #DC2626, #991B1B);

    /* Secondary */
    --secondary: #7C3AED;
    --secondary-dark: #5B21B6;

    /* Accent */
    --accent: #0F172A;

    /* Status */
    --success: #16A34A;
    --warning: #EAB308;
    --error: #DC2626;

    /* Dark Theme Base */
    --bg: #0F0F0F;
    --bg-secondary: #1A1A1A;
    --bg-tertiary: #2A2A2A;
    --bg-card: #1E1E1E;
    --bg-card-hover: #2A2A2A;

    /* Text */
    --text: #F1F5F9;
    --text-secondary: #CBD5E1;
    --text-muted: #94A3B8;
    --text-dark: #0F172A;

    /* Borders */
    --border: #333333;
    --border-light: #444444;

    /* Shadows */
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.6);
    --shadow-red: 0 4px 20px rgba(220, 38, 38, 0.2);

    /* Radius */
    --radius: 0.75rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;

    /* Font */
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

    /* Transitions */
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    /* Spacing */
    --spacing: 1rem;
    --spacing-sm: 0.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
}

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

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

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

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

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

/* ============================================================
   Container
   ============================================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.25rem;
    width: 100%;
}

/* ============================================================
   Skip Link
   ============================================================ */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: 0 0 var(--radius) var(--radius);
    z-index: 9999;
    font-weight: 600;
}

.skip-link:focus {
    top: 0;
}

/* ============================================================
   Header
   ============================================================ */
header {
    background: var(--bg-secondary);
    border-bottom: 2px solid var(--primary);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text);
    text-decoration: none;
    flex-shrink: 0;
}

.logo .brand-red {
    color: var(--primary);
}

.logo svg {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
}

/* Navigation */
nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    flex-wrap: wrap;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    padding: 0.5rem 0.85rem;
    border-radius: var(--radius);
    transition: all var(--transition);
    position: relative;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition);
}

nav a:hover::after,
nav a.active::after {
    width: 60%;
}

nav a:hover,
nav a.active {
    color: #fff;
    background: rgba(220, 38, 38, 0.15);
}

/* Theme Toggle */
.theme-toggle,
.menu-toggle {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius);
    transition: background var(--transition);
    color: var(--text);
}

.theme-toggle:hover,
.menu-toggle:hover {
    background: var(--bg-tertiary);
}

.menu-toggle {
    display: none;
    font-size: 1.5rem;
}

/* ============================================================
   Hero Section
   ============================================================ */
.hero {
    text-align: center;
    padding: 4rem 0 3rem;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg) 100%);
    border-bottom: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(220, 38, 38, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero h1 {
    font-size: 3rem;
    line-height: 1.15;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.hero h1 .highlight {
    color: var(--primary);
    position: relative;
}

.hero h1 .highlight::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary);
    border-radius: var(--radius-full);
    opacity: 0.4;
}

.hero p {
    color: var(--text-secondary);
    font-size: 1.15rem;
    max-width: 650px;
    margin: 0 auto 1.5rem;
}

.hero .badge-row {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.hero .badge-row .badge {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.3rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    border: 1px solid var(--border);
}

.hero .badge-row .badge .icon {
    margin-right: 0.3rem;
}

/* ============================================================
   Search Box
   ============================================================ */
.search-box {
    max-width: 540px;
    margin: 1.5rem auto 0;
    position: relative;
}

.search-box input {
    width: 100%;
    padding: 0.9rem 1.25rem;
    font-size: 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-full);
    background: var(--bg-secondary);
    color: var(--text);
    outline: none;
    transition: all var(--transition);
}

.search-box input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.15);
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-results {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    max-height: 400px;
    overflow-y: auto;
    display: none;
    z-index: 50;
}

.search-results.active {
    display: block;
}

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

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

.search-result:hover {
    background: var(--bg-tertiary);
}

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

.search-result .name {
    font-weight: 500;
}

.search-result .cat {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-left: auto;
    background: var(--bg-tertiary);
    padding: 0.15rem 0.6rem;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.search-empty {
    padding: 1.5rem;
    text-align: center;
    color: var(--text-muted);
}

/* ============================================================
   Sections
   ============================================================ */
.section {
    padding: 3rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.section-header h2 {
    font-size: 2rem;
    letter-spacing: -0.01em;
}

.section-header h2 .highlight {
    color: var(--primary);
}

.section-header p {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0.25rem auto 0;
}

/* ============================================================
   Tool Grid
   ============================================================ */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
    gap: 1.25rem;
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    transition: all var(--transition);
    cursor: pointer;
    text-decoration: none;
    color: var(--text);
    display: block;
    position: relative;
    overflow: hidden;
}

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

.tool-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: var(--shadow-red);
    background: var(--bg-card-hover);
}

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

.tool-card .icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.tool-card h3 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.tool-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.tool-card .badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--primary);
    background: rgba(220, 38, 38, 0.12);
    padding: 0.15rem 0.6rem;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* ============================================================
   Category Grid
   ============================================================ */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
    gap: 1rem;
}

.category-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem 1rem;
    text-align: center;
    text-decoration: none;
    color: var(--text);
    transition: all var(--transition);
}

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

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

.category-card h3 {
    font-size: 0.9rem;
    margin-top: 0.25rem;
}

.category-card .count {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ============================================================
   Guide Grid
   ============================================================ */
.guide-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.guide-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: all var(--transition);
}

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

.guide-card .tag {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--primary);
    background: rgba(220, 38, 38, 0.12);
    padding: 0.15rem 0.6rem;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-bottom: 0.5rem;
}

.guide-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.guide-card h3 a {
    color: var(--text);
    text-decoration: none;
}

.guide-card h3 a:hover {
    color: var(--primary);
}

.guide-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.guide-card .read-more {
    color: var(--primary);
    font-weight: 600;
    font-size: 0.875rem;
    text-decoration: none;
}

.guide-card .read-more:hover {
    text-decoration: underline;
}

/* ============================================================
   Tool Page (Calculator)
   ============================================================ */
.tool-page {
    padding: 1.5rem 0;
    flex: 1;
}

.tool-page .breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.tool-page .breadcrumb a {
    color: var(--text-secondary);
}

.tool-page .breadcrumb a:hover {
    color: var(--primary);
}

.tool-page .breadcrumb .separator {
    color: var(--text-muted);
}

.tool-page .breadcrumb .current {
    color: var(--text);
}

.tool-page h1 {
    font-size: 2.25rem;
    margin-bottom: 0.25rem;
}

.tool-page .tool-desc {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

/* Calculator */
.calculator {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    margin-bottom: 1.5rem;
}

.calculator .calc-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.calculator .calc-group label {
    display: block;
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
    color: var(--text-secondary);
}

.calculator .calc-group input,
.calculator .calc-group select {
    width: 100%;
    padding: 0.65rem 0.85rem;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    background: var(--bg-secondary);
    color: var(--text);
    transition: border-color var(--transition);
}

.calculator .calc-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.1);
}

.calculator .calc-group .error {
    color: var(--error);
    font-size: 0.8rem;
    margin-top: 0.2rem;
    display: none;
}

.calculator .calc-group .error.show {
    display: block;
}

.calculator .calc-btns {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    padding: 0.65rem 1.75rem;
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

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

.btn-primary:hover {
    box-shadow: var(--shadow-red);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text);
}

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

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

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

.btn-success:hover {
    background: #15803D;
}

/* Results */
.results {
    display: none;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-top: 1rem;
}

.results.show {
    display: block;
}

.results .result-main {
    text-align: center;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.results .result-main .label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.results .result-main .value {
    font-size: 3rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.results .detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 0.75rem;
    margin-top: 1rem;
}

.results .detail-item {
    background: var(--bg-card);
    padding: 0.75rem;
    border-radius: var(--radius);
    text-align: center;
}

.results .detail-item dt {
    font-weight: 600;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.results .detail-item dd {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
    word-break: break-word;
}

/* ============================================================
   Article / Guide Content
   ============================================================ */
.article-content {
    margin: 2rem 0;
}

.article-content h2 {
    font-size: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: var(--text);
}

.article-content h3 {
    font-size: 1.2rem;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.article-content p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.article-content ul,
.article-content ol {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.article-content li {
    margin-bottom: 0.25rem;
}

.article-content .info-box {
    background: var(--bg-secondary);
    border-left: 4px solid var(--primary);
    padding: 1rem 1.25rem;
    border-radius: 0 var(--radius) var(--radius) 0;
    margin: 1.5rem 0;
}

.article-content .info-box strong {
    color: var(--text);
}

.article-content .info-box.warning {
    border-left-color: var(--warning);
}

.article-content .info-box.success {
    border-left-color: var(--success);
}

.article-content .info-box.error {
    border-left-color: var(--error);
}

/* ============================================================
   FAQ
   ============================================================ */
.faq-section {
    margin: 2rem 0;
}

.faq-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text);
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 0.5rem;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 0.85rem 1.25rem;
    background: var(--bg-secondary);
    border: none;
    font-weight: 600;
    font-size: 0.95rem;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background var(--transition);
    color: var(--text);
}

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

.faq-question::after {
    content: "▼";
    font-size: 0.7rem;
    transition: transform var(--transition);
    color: var(--text-muted);
}

.faq-question.open::after {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 1.25rem 1rem;
    display: none;
    color: var(--text-secondary);
}

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

/* ============================================================
   Disclaimer
   ============================================================ */
.disclaimer-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    margin: 1.5rem 0;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.disclaimer-box strong {
    color: var(--text);
}

/* ============================================================
   Related Tools
   ============================================================ */
.related-tools {
    margin-top: 2rem;
}

.related-tools h3 {
    margin-bottom: 1rem;
    color: var(--text);
}

/* ============================================================
   Footer
   ============================================================ */
footer {
    background: var(--bg-secondary);
    border-top: 2px solid var(--primary);
    color: var(--text-secondary);
    padding: 3rem 0 1.5rem;
    margin-top: auto;
}

footer .container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2rem;
}

footer h4 {
    color: var(--text);
    margin-bottom: 0.75rem;
    font-size: 1rem;
}

footer p {
    font-size: 0.875rem;
    color: var(--text-muted);
    max-width: 300px;
}

footer a {
    color: var(--text-muted);
    text-decoration: none;
    display: block;
    font-size: 0.875rem;
    padding: 0.2rem 0;
    transition: color var(--transition);
}

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

footer .footer-social {
    display: flex;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

footer .footer-social a {
    font-size: 1.25rem;
}

footer .disclaimer {
    grid-column: 1 / -1;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    font-size: 0.8rem;
    text-align: center;
    color: var(--text-muted);
}

footer .disclaimer strong {
    color: var(--text-secondary);
}

/* ============================================================
   Error / 404 Page
   ============================================================ */
.error-page {
    text-align: center;
    padding: 4rem 0;
}

.error-page .code {
    font-size: 6rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.error-page h2 {
    font-size: 2rem;
    margin: 1rem 0 0.5rem;
}

.error-page p {
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto 2rem;
}

/* ============================================================
   Legal Pages
   ============================================================ */
.legal-page {
    padding: 2rem 0;
    flex: 1;
}

.legal-page h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.legal-page .subtitle {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.legal-page .content h2 {
    font-size: 1.3rem;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.legal-page .content p {
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.legal-page .content ul {
    padding-left: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.legal-page .content li {
    margin-bottom: 0.25rem;
}

/* ============================================================
   Back Button
   ============================================================ */
.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    margin-bottom: 1rem;
    cursor: pointer;
    background: none;
    border: none;
    font-size: 0.95rem;
    padding: 0.5rem 0;
}

.back-btn:hover {
    color: var(--primary-hover);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 992px) {
    .hero h1 {
        font-size: 2.25rem;
    }

    footer .container {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    nav {
        display: none;
        width: 100%;
        flex-direction: column;
        padding: 0.5rem 0;
        gap: 0.25rem;
    }

    nav.open {
        display: flex;
    }

    nav a {
        width: 100%;
        padding: 0.6rem 0.75rem;
    }

    nav a::after {
        display: none;
    }

    .hero {
        padding: 2.5rem 0 2rem;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .tool-grid {
        grid-template-columns: 1fr;
    }

    .category-grid {
        grid-template-columns: 1fr 1fr;
    }

    .guide-grid {
        grid-template-columns: 1fr;
    }

    .calculator .calc-row {
        grid-template-columns: 1fr;
    }

    footer .container {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .results .detail-grid {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 2rem 0;
    }

    .section-header h2 {
        font-size: 1.5rem;
    }

    .tool-page h1 {
        font-size: 1.5rem;
    }

    .results .result-main .value {
        font-size: 2rem;
    }

    .calculator .calc-btns {
        flex-direction: column;
    }

    .calculator .calc-btns .btn {
        width: 100%;
        justify-content: center;
    }

    .hero .badge-row .badge {
        font-size: 0.7rem;
        padding: 0.2rem 0.7rem;
    }

    .error-page .code {
        font-size: 4rem;
    }
}

@media (max-width: 480px) {
    .category-grid {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .container {
        padding: 0 0.75rem;
    }

    .search-box input {
        padding: 0.65rem 1rem;
        font-size: 0.9rem;
    }

    .calculator {
        padding: 1rem;
    }

    .results .result-main .value {
        font-size: 1.5rem;
    }
}

/* ============================================================
   Print Styles
   ============================================================ */
@media print {
    header,
    footer,
    .search-box,
    .calc-btns,
    .back-btn,
    .theme-toggle,
    .menu-toggle,
    nav,
    .related-tools {
        display: none !important;
    }

    body {
        background: #fff;
        color: #000;
    }

    .calculator {
        border: 1px solid #ddd;
        background: none;
        padding: 1rem;
    }

    .results {
        border: 1px solid #ddd;
        background: none;
    }

    .results .result-main .value {
        -webkit-text-fill-color: #000;
        background: none;
        color: #000;
    }

    .container {
        max-width: 100%;
        padding: 0;
    }

    .tool-page {
        padding: 0;
    }

    .article-content .info-box {
        border-left-color: #000;
        background: #f5f5f5;
    }

    .disclaimer-box {
        border: 1px solid #ddd;
        background: #f5f5f5;
    }
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* ============================================================
   Animations
   ============================================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tool-card,
.guide-card,
.category-card {
    animation: fadeInUp 0.5s ease forwards;
}

.tool-card:nth-child(2) {
    animation-delay: 0.05s;
}
.tool-card:nth-child(3) {
    animation-delay: 0.1s;
}
.tool-card:nth-child(4) {
    animation-delay: 0.15s;
}
.tool-card:nth-child(5) {
    animation-delay: 0.2s;
}
.tool-card:nth-child(6) {
    animation-delay: 0.25s;
}