/* ============================================================
   YouTube ToolKits - Complete Stylesheet
   Version: 3.0 (AdSense + Legal + Blog + API Tools + Responsive)
   ============================================================ */

/* ============================================================
   CSS Variables
   ============================================================ */
:root {
    --primary: #DC2626;
    --primary-dark: #991B1B;
    --primary-hover: #EF4444;
    --primary-light: rgba(220, 38, 38, 0.12);
    --primary-border: rgba(220, 38, 38, 0.25);

    --bg: #0B0B0B;
    --bg-2: #121212;
    --bg-3: #1A1A1A;
    --bg-card: #141414;
    --bg-card-hover: #1E1E1E;

    --text: #F5F5F5;
    --text-2: #A1A1A1;
    --text-3: #6B6B6B;

    --border: #232323;
    --border-2: #2E2E2E;

    --success: #16A34A;
    --warning: #EAB308;
    --error: #DC2626;

    --radius: 12px;
    --radius-sm: 8px;
    --radius-full: 9999px;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow: 0 6px 24px rgba(0, 0, 0, 0.4);
    --shadow-red: 0 6px 24px rgba(220, 38, 38, 0.22);

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

    --transition: 0.25s ease;
    --container: 1200px;
}

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

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

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
}

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

button {
    font-family: inherit;
    cursor: pointer;
}

code {
    background: var(--bg-3);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.85em;
    color: #F87171;
}

/* Focus states for accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    z-index: 1000;
    font-weight: 700;
}

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

/* ============================================================
   Header
   ============================================================ */
.site-header {
    background: var(--bg-2);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.85rem 0;
    flex-wrap: wrap;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 800;
    font-size: 1.1rem;
    line-height: 1;
    flex-shrink: 0;
}

.logo svg {
    display: block;
    flex-shrink: 0;
    width: auto;
    height: auto;
}

.logo-text {
    display: inline-flex;
    gap: 0.25rem;
    align-items: baseline;
    white-space: nowrap;
}

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

.logo-suffix {
    color: var(--text);
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 0.15rem;
    flex-wrap: wrap;
    justify-content: center;
}

.main-nav a {
    color: var(--text-2);
    font-weight: 500;
    font-size: 0.85rem;
    padding: 0.5rem 0.8rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    white-space: nowrap;
}

.main-nav a:hover {
    color: #fff;
    background: var(--primary-light);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    width: 36px;
    height: 36px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    padding: 4px;
    border-radius: var(--radius-sm);
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
}

/* ============================================================
   Hero Section
   ============================================================ */
.hero {
    background: linear-gradient(180deg, var(--bg-2), var(--bg));
    border-bottom: 1px solid var(--border);
    padding: 3.5rem 0 3rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: -30%;
    right: -10%;
    width: 520px;
    height: 520px;
    background: radial-gradient(circle, rgba(220, 38, 38, 0.12), transparent 65%);
    border-radius: 50%;
    pointer-events: none;
}

.hero .container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero h1 {
    font-size: 2.4rem;
    font-weight: 800;
    line-height: 1.2;
    max-width: 820px;
    margin: 0 auto 0.75rem;
    position: relative;
    text-align: center;
}

.hero h1 .hl {
    color: var(--primary);
}

.hero p {
    color: var(--text-2);
    font-size: 1rem;
    max-width: 640px;
    margin: 0 auto 1.75rem;
    position: relative;
    text-align: center;
}

.hero-form {
    display: grid;
    grid-template-columns: 1.6fr 1fr auto;
    gap: 0.5rem;
    max-width: 780px;
    margin: 0 auto 1.5rem;
    position: relative;
    width: 100%;
}

.hero-form input,
.hero-form select {
    background: var(--bg-3);
    border: 1px solid var(--border-2);
    color: var(--text);
    padding: 0.85rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    outline: none;
    width: 100%;
    font-family: inherit;
}

.hero-form input::placeholder {
    color: var(--text-3);
}

.hero-form input:focus,
.hero-form select:focus {
    border-color: var(--primary);
}

.hero-form button {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 0.85rem 1.75rem;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.9rem;
    transition: background var(--transition);
    cursor: pointer;
    white-space: nowrap;
}

.hero-form button:hover {
    background: var(--primary-dark);
    box-shadow: var(--shadow-red);
}

.hero-steps {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-top: 1rem;
    color: var(--text-2);
    font-size: 0.8rem;
    position: relative;
}

.hero-steps span {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.hero-steps span::before {
    content: "";
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
}

/* ============================================================
   Search Box
   ============================================================ */
.search-box {
    max-width: 560px;
    margin: 1.5rem auto 0;
    position: relative;
    width: 100%;
}

.search-box input {
    width: 100%;
    padding: 0.75rem 1.25rem;
    border: 1px solid var(--border-2);
    border-radius: var(--radius-full);
    background: var(--bg-3);
    color: var(--text);
    font-size: 0.9rem;
    outline: none;
    font-family: inherit;
}

.search-box input:focus {
    border-color: var(--primary);
}

.search-results {
    position: absolute;
    top: calc(100% + 0.4rem);
    left: 0;
    right: 0;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    max-height: 340px;
    overflow-y: auto;
    display: none;
    z-index: 60;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.55);
    text-align: left;
}

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

.search-result {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.65rem 1rem;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: background var(--transition);
}

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

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

.search-result .sr-name {
    font-weight: 500;
    font-size: 0.88rem;
}

.search-result .sr-cat {
    margin-left: auto;
    font-size: 0.65rem;
    color: var(--text-3);
    background: var(--bg-card);
    padding: 0.15rem 0.55rem;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.section-header {
    text-align: center;
    margin-bottom: 2rem;
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
    padding: 0 1rem;
}

.section-header h2 {
    font-size: 1.9rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    text-align: center;
}

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

.section-header p {
    color: var(--text-2);
    font-size: 0.9rem;
    text-align: center;
}

.pill {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary);
    background: var(--primary-light);
    border: 1px solid var(--primary-border);
    padding: 0.35rem 0.9rem;
    border-radius: var(--radius-full);
    margin-bottom: 0.85rem;
}

/* ============================================================
   Quick Filters
   ============================================================ */
.quick-filters {
    background: var(--bg-2);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
}

.filter-tabs {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.filter-tab {
    background: var(--bg-3);
    border: 1px solid var(--border-2);
    color: var(--text-2);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.5rem 1.1rem;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
}

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

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

/* ============================================================
   Tool Grid & Tool Cards
   ============================================================ */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    max-width: 1000px;
    margin: 0 auto;
}

.tool-card-wrapper {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.tool-card-wrapper .tool-card {
    flex: 1;
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    transition: all var(--transition);
    cursor: pointer;
    text-align: left;
}

.tool-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--primary);
    box-shadow: var(--shadow-red);
    transform: translateY(-2px);
}

.tool-card .card-icon {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-sm);
    background: var(--primary-light);
    border: 1px solid var(--primary-border);
    display: grid;
    place-items: center;
    flex-shrink: 0;
}

.tool-card .card-icon svg {
    display: block;
    width: 20px;
    height: 20px;
}

.tool-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
}

.tool-card p {
    font-size: 0.82rem;
    color: var(--text-2);
}

.tool-card .card-link {
    color: var(--primary);
    font-size: 0.82rem;
    font-weight: 600;
    margin-top: auto;
    padding-top: 0.25rem;
}

.tool-card:hover .card-link {
    color: var(--primary-hover);
}

.card-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 0 0.5rem 0.5rem;
}

.card-open-link {
    color: var(--primary);
    font-size: 0.8rem;
    font-weight: 600;
    transition: color 0.2s;
}

.card-open-link:hover {
    color: var(--primary-hover);
}

/* Quick Info Button */
.tool-info-btn {
    background: var(--primary-light);
    border: 1px solid var(--primary-border);
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.3rem 0.75rem;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all 0.2s;
    align-self: flex-start;
    font-family: inherit;
}

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

/* ============================================================
   Category Grid
   ============================================================ */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    max-width: 1000px;
    margin: 0 auto;
}

.category-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem 1rem;
    text-align: center;
    transition: all var(--transition);
}

.category-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-red);
    transform: translateY(-2px);
}

.category-card .cat-icon {
    width: 42px;
    height: 42px;
    margin: 0 auto 0.5rem;
    border-radius: var(--radius-sm);
    background: var(--primary-light);
    display: grid;
    place-items: center;
}

.category-card .cat-icon svg {
    display: block;
    width: 22px;
    height: 22px;
    margin: 0 auto;
}

.category-card h3 {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.category-card .cat-count {
    font-size: 0.75rem;
    color: var(--text-3);
}

/* ============================================================
   Popular Tags
   ============================================================ */
.popular-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    justify-content: center;
    max-width: 900px;
    margin: 0 auto;
}

.popular-tag {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-2);
    padding: 0.55rem 1.1rem;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s;
}

.popular-tag:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    transform: translateY(-2px);
}

/* ============================================================
   How It Works
   ============================================================ */
.how-img {
    height: 180px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    margin: 0 auto 1.5rem;
    max-width: 900px;
    background: linear-gradient(135deg, #2A0A0A, #0B0B0B 70%),
                radial-gradient(circle at 30% 50%, rgba(220, 38, 38, 0.35), transparent 60%);
    position: relative;
    overflow: hidden;
}

.how-img::after {
    content: "";
    position: absolute;
    inset: 20% 15%;
    background: radial-gradient(circle at 25% 50%, rgba(220, 38, 38, 0.5), transparent 55%),
                radial-gradient(circle at 75% 50%, rgba(220, 38, 38, 0.25), transparent 55%);
    border-radius: var(--radius);
    filter: blur(20px);
}

.how-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    max-width: 1000px;
    margin: 0 auto;
}

.how-step {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    text-align: center;
}

.how-step .step-num {
    display: inline-grid;
    place-items: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-weight: 700;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.how-step h4 {
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.how-step p {
    font-size: 0.8rem;
    color: var(--text-2);
}

/* ============================================================
   Tool Page
   ============================================================ */
.tool-page {
    padding: 2rem 0;
    flex: 1;
}

.breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    font-size: 0.78rem;
    color: var(--text-3);
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    text-align: center;
}

.breadcrumb a {
    color: var(--text-2);
}

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

.breadcrumb .sep {
    opacity: 0.5;
}

/* Tool Header */
.tool-header {
    text-align: center;
    margin-bottom: 2rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.tool-header-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 1rem;
    border-radius: 16px;
    background: var(--primary-light);
    border: 1px solid var(--primary-border);
    display: grid;
    place-items: center;
}

.tool-header-icon svg {
    display: block;
}

.tool-page h1 {
    font-size: 1.9rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    text-align: center;
}

.tool-page .desc {
    color: var(--text-2);
    margin-bottom: 1.5rem;
    font-size: 0.98rem;
    text-align: center;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.tool-meta-badges {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.meta-badge {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--primary);
    background: var(--primary-light);
    border: 1px solid var(--primary-border);
    padding: 0.3rem 0.75rem;
    border-radius: var(--radius-full);
}

.meta-badge-live {
    background: rgba(22, 163, 74, 0.12);
    color: var(--success);
    border-color: rgba(22, 163, 74, 0.25);
}

/* ============================================================
   Calculator
   ============================================================ */
.calculator {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem;
    margin: 0 auto 1.5rem;
    max-width: 900px;
}

.calc-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.calc-group label {
    display: block;
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--text-2);
    margin-bottom: 0.35rem;
    text-align: left;
}

.calc-group input,
.calc-group textarea,
.calc-group select {
    width: 100%;
    padding: 0.7rem 0.85rem;
    background: var(--bg-3);
    border: 1px solid var(--border-2);
    color: var(--text);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-family: inherit;
    outline: none;
    transition: border-color var(--transition);
}

.calc-group textarea {
    min-height: 90px;
    resize: vertical;
}

.calc-group input:focus,
.calc-group textarea:focus,
.calc-group select:focus {
    border-color: var(--primary);
}

.calc-btns {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 1rem;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
    padding: 0.7rem 1.75rem;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.85rem;
    transition: all var(--transition);
    cursor: pointer;
    font-family: inherit;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    text-decoration: none;
}

.btn:hover {
    transform: translateY(-1px);
}

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

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

.btn-secondary {
    background: var(--bg-3);
    color: var(--text);
    border: 1px solid var(--border-2);
}

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

/* ============================================================
   Results
   ============================================================ */
.results {
    display: none;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-left: 3px solid var(--primary);
    border-radius: var(--radius);
    padding: 1.75rem;
    margin: 0 auto 1.5rem;
    max-width: 900px;
    animation: fadeIn 0.3s ease;
}

.results.show {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

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

.result-main .label {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-3);
}

.result-main .value {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--primary);
    word-break: break-word;
    margin-top: 0.35rem;
    line-height: 1.1;
    text-align: center;
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0.6rem;
    margin-top: 1rem;
}

.detail-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.7rem;
    text-align: center;
}

.detail-item dt {
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-3);
    text-align: center;
}

.detail-item dd {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    margin-top: 0.2rem;
    word-break: break-word;
    text-align: center;
}

.result-actions {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin-top: 1.25rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
}

/* API extras */
.api-extra {
    margin-top: 1.5rem;
    text-align: left;
}

.api-extra img {
    max-width: 100%;
    border-radius: 12px;
    display: block;
    margin: 0 auto;
}

.api-extra iframe {
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: 12px;
    border: 0;
}

.api-extra .kw-tag {
    display: inline-block;
    background: var(--bg-3);
    padding: 0.3rem 0.7rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    margin: 0.2rem;
    color: var(--text-2);
}

/* API comments */
.api-comment {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1rem;
    margin-bottom: 0.75rem;
}

.api-comment .author-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.api-comment .author-name {
    color: #fff;
    font-weight: 700;
}

.api-comment .likes {
    color: var(--text-3);
    font-size: 0.8rem;
}

.api-comment .text {
    color: var(--text-2);
    font-size: 0.9rem;
    white-space: pre-wrap;
}

.api-comment .date {
    color: var(--text-3);
    font-size: 0.75rem;
    margin-top: 0.5rem;
}

/* ============================================================
   Loading Spinner
   ============================================================ */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-2);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    vertical-align: middle;
    margin-right: 0.5rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================================
   Content Block
   ============================================================ */
.content-block {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.content-block h2 {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
    text-align: center;
}

.content-block h2 .hl {
    color: var(--primary);
}

.content-block h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 1.75rem 0 0.75rem;
    text-align: center;
}

.content-block h4 {
    font-size: 1rem;
    font-weight: 700;
    margin: 1.25rem 0 0.5rem;
    text-align: center;
}

.content-block p {
    color: var(--text-2);
    font-size: 0.92rem;
    margin-bottom: 0.75rem;
    text-align: center;
}

.content-block ul,
.content-block ol {
    list-style: none;
    padding: 0;
    margin: 0 auto 0.75rem;
    display: inline-block;
    text-align: left;
}

.content-block ul li,
.content-block ol li {
    position: relative;
    padding-left: 1.35rem;
    margin-bottom: 0.55rem;
    font-size: 0.88rem;
    color: var(--text-2);
}

.content-block ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
}

.content-block ul li strong,
.content-block ol li strong {
    color: #fff;
}

.content-block a {
    color: var(--primary);
    text-decoration: underline;
}

/* Tool content (left-aligned) */
.tool-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    margin: 2rem auto;
    max-width: 900px;
    text-align: left;
}

.tool-content h2 {
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 1rem;
    text-align: left;
}

.tool-content h3 {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--primary);
    margin: 1.75rem 0 0.75rem;
    text-align: left;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tool-content p {
    color: var(--text-2);
    font-size: 0.95rem;
    line-height: 1.75;
    margin-bottom: 1rem;
    text-align: left;
}

.tool-content ul {
    list-style: none;
    padding: 0;
    margin-bottom: 1rem;
    display: block;
}

.tool-content ul li {
    position: relative;
    padding-left: 1.35rem;
    margin-bottom: 0.6rem;
    font-size: 0.9rem;
    color: var(--text-2);
    line-height: 1.6;
    text-align: left;
}

.tool-content ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
}

/* ============================================================
   Formula Box
   ============================================================ */
.formula-box {
    display: block;
    background: var(--bg-3);
    border-left: 3px solid var(--primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: 0.85rem 1.15rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: #F87171;
    margin: 0.75rem 0 1rem;
    text-align: left;
    overflow-x: auto;
    word-break: break-word;
}

.formula-block {
    display: block;
    background: var(--bg-3);
    border-left: 3px solid var(--primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: 0.85rem 1.15rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: #F87171;
    margin: 0.75rem 0 1rem;
    text-align: left;
    overflow-x: auto;
}

/* ============================================================
   FAQ Section
   ============================================================ */
.faq-section {
    margin: 1.5rem auto;
    max-width: 900px;
}

.faq-section h2 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
}

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

.faq-question {
    width: 100%;
    padding: 0.9rem 1.1rem;
    background: transparent;
    border: none;
    color: var(--text);
    font-size: 0.88rem;
    font-weight: 600;
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: inherit;
    cursor: pointer;
    transition: background var(--transition);
}

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

.faq-question::after {
    content: "";
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--text-3);
    border-bottom: 2px solid var(--text-3);
    transform: rotate(45deg);
    transition: transform var(--transition);
    flex-shrink: 0;
    margin-left: 0.75rem;
}

.faq-question.open::after {
    transform: rotate(-135deg);
}

.faq-answer {
    display: none;
    padding: 0 1.1rem 0.9rem;
    color: var(--text-2);
    font-size: 0.85rem;
    text-align: left;
    line-height: 1.7;
}

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

/* ============================================================
   Disclaimer Box
   ============================================================ */
.disclaimer-box {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-left: 3px solid var(--warning);
    border-radius: var(--radius-sm);
    padding: 0.9rem 1rem;
    margin: 1rem auto;
    font-size: 0.8rem;
    color: var(--text-2);
    max-width: 900px;
    text-align: center;
}

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

/* ============================================================
   Legal Notice (Green)
   ============================================================ */
.legal-notice {
    background: rgba(22, 163, 74, 0.08);
    border: 1px solid rgba(22, 163, 74, 0.25);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    margin: 0 auto 1.5rem;
    max-width: 900px;
    font-size: 0.85rem;
    color: var(--text-2);
    text-align: center;
}

.legal-notice strong {
    color: var(--success);
}

/* ============================================================
   Related Tools
   ============================================================ */
.related-tools {
    margin: 2rem auto 0;
    max-width: 900px;
    text-align: center;
}

.related-tools h2 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 0.75rem;
    margin-top: 0.75rem;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================================
   Music Grid (Royalty-Free Music tool)
   ============================================================ */
.music-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    max-width: 1000px;
    margin: 0 auto 2rem;
}

.music-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    transition: all 0.25s;
    text-align: center;
    text-decoration: none;
    color: var(--text);
}

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

.music-card .music-icon {
    width: 44px;
    height: 44px;
    margin: 0 auto 0.75rem;
    border-radius: 12px;
    background: var(--primary-light);
    display: grid;
    place-items: center;
}

.music-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 0.35rem;
}

.music-card .music-license {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.35rem;
}

.music-card .music-moods {
    font-size: 0.8rem;
    color: var(--text-3);
    margin-bottom: 0.5rem;
}

.music-card .card-link {
    color: var(--primary);
    font-size: 0.8rem;
    font-weight: 600;
}

/* ============================================================
   Backup Steps Grid
   ============================================================ */
.backup-steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    max-width: 900px;
    margin: 0 auto 2rem;
}

.backup-step {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
    position: relative;
}

.backup-step-num {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: grid;
    place-items: center;
    font-size: 0.85rem;
    font-weight: 700;
}

.backup-step-icon {
    width: 48px;
    height: 48px;
    margin: 1rem auto 0.75rem;
    border-radius: 12px;
    background: var(--primary-light);
    display: grid;
    place-items: center;
}

.backup-step h3 {
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 0.35rem;
}

.backup-step p {
    font-size: 0.82rem;
    color: var(--text-2);
}

/* ============================================================
   Blog
   ============================================================ */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.25rem;
    max-width: 1000px;
    margin: 0 auto;
}

.blog-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    transition: all var(--transition);
    cursor: pointer;
    text-decoration: none;
    color: var(--text);
}

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

.blog-card-featured {
    border-color: var(--primary-border);
    background: linear-gradient(180deg, rgba(220, 38, 38, 0.06), transparent 60%),
                var(--bg-card);
}

.blog-category {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary);
    background: var(--primary-light);
    border: 1px solid var(--primary-border);
    padding: 0.25rem 0.7rem;
    border-radius: var(--radius-full);
    align-self: flex-start;
}

.blog-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: #fff;
    line-height: 1.35;
}

.blog-card p {
    font-size: 0.88rem;
    color: var(--text-2);
}

.blog-meta {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.75rem;
    color: var(--text-3);
    margin-top: auto;
    padding-top: 0.5rem;
}

.blog-post-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 2rem;
}

.blog-post-header h1 {
    font-size: 2.1rem;
    font-weight: 800;
    line-height: 1.2;
    margin: 1rem 0;
    color: #fff;
}

.blog-post-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.82rem;
    color: var(--text-3);
    flex-wrap: wrap;
}

.blog-post-content {
    max-width: 780px;
    margin: 0 auto;
    color: var(--text-2);
    font-size: 1rem;
    line-height: 1.75;
    text-align: left;
}

.blog-post-content h2 {
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
    margin: 2.25rem 0 1rem;
    text-align: left;
}

.blog-post-content h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: #fff;
    margin: 1.75rem 0 0.75rem;
    text-align: left;
}

.blog-post-content h4 {
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    margin: 1.25rem 0 0.5rem;
    text-align: left;
}

.blog-post-content p {
    margin-bottom: 1rem;
    text-align: left;
}

.blog-post-content ul,
.blog-post-content ol {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
    text-align: left;
}

.blog-post-content ul li,
.blog-post-content ol li {
    margin-bottom: 0.4rem;
    line-height: 1.65;
}

.blog-post-content .info-box {
    background: var(--bg-2);
    border-left: 3px solid var(--primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: 1rem 1.25rem;
    margin: 1.25rem 0;
    text-align: left;
}

.blog-post-content .info-box strong {
    color: var(--primary);
    display: block;
    margin-bottom: 0.25rem;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.blog-post-content a {
    color: var(--primary);
    text-decoration: underline;
}

/* ============================================================
   Legal Pages
   ============================================================ */
.legal-header {
    text-align: center;
    margin-bottom: 2.5rem;
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}

.legal-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary);
    background: var(--primary-light);
    border: 1px solid var(--primary-border);
    padding: 0.35rem 0.9rem;
    border-radius: var(--radius-full);
    margin-bottom: 1rem;
}

.legal-header h1 {
    font-size: 2.2rem;
    font-weight: 800;
    color: #fff;
    line-height: 1.2;
    margin-bottom: 0.5rem;
}

.legal-subtitle {
    color: var(--text-3);
    font-size: 0.95rem;
}

.legal-content {
    max-width: 800px;
    margin: 0 auto;
    color: var(--text-2);
    font-size: 0.95rem;
    line-height: 1.75;
    text-align: left;
}

.legal-content h2 {
    font-size: 1.35rem;
    font-weight: 800;
    color: #fff;
    margin: 2.25rem 0 0.85rem;
    text-align: left;
}

.legal-content h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary);
    margin: 1.5rem 0 0.5rem;
    text-align: left;
}

.legal-content p {
    margin-bottom: 1rem;
    text-align: left;
}

.legal-content ul,
.legal-content ol {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
    text-align: left;
}

.legal-content ul li,
.legal-content ol li {
    margin-bottom: 0.5rem;
    line-height: 1.65;
}

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

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

.legal-content strong {
    color: #fff;
}

.legal-summary-box {
    background: var(--primary-light);
    border-left: 3px solid var(--primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: 1.15rem 1.35rem;
    margin: 1.5rem 0;
    font-size: 0.9rem;
    color: var(--text-2);
}

.legal-summary-box strong {
    color: var(--primary);
}

.legal-notice-box {
    background: var(--bg-2);
    border: 1px solid var(--border-2);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
}

.legal-notice-box p {
    margin-bottom: 0;
}

.legal-footer-note {
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-3);
    text-align: center;
}

/* Contact form */
.contact-form {
    max-width: 700px;
    margin: 1.5rem auto 2.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem;
}

.contact-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.contact-form .form-group {
    margin-bottom: 1rem;
}

.contact-form label {
    display: block;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-2);
    margin-bottom: 0.35rem;
    text-align: left;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
    width: 100%;
    padding: 0.7rem 0.85rem;
    background: var(--bg-3);
    border: 1px solid var(--border-2);
    color: var(--text);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-family: inherit;
    outline: none;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
    border-color: var(--primary);
}

.contact-form textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form .checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    margin-bottom: 1.25rem;
}

.contact-form .checkbox-group input {
    width: auto;
    margin-top: 0.25rem;
}

.contact-form .checkbox-group label {
    margin: 0;
    font-weight: 400;
    font-size: 0.8rem;
    color: var(--text-3);
}

.form-status {
    margin-top: 1rem;
    font-size: 0.85rem;
    text-align: center;
    min-height: 1.2rem;
}

.form-status.success {
    color: var(--success);
}

.form-status.error {
    color: var(--error);
}

.contact-emails {
    list-style: none;
    padding: 0;
}

.contact-emails li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
}

.contact-emails a {
    color: var(--primary);
}

/* ============================================================
   Modal (Tool Info Popup)
   ============================================================ */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    z-index: 999;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    backdrop-filter: blur(4px);
    animation: fadeIn 0.2s ease;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: var(--bg-2);
    border: 1px solid var(--border-2);
    border-radius: 16px;
    max-width: 640px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    padding: 2rem;
    position: relative;
    animation: slideUp 0.25s ease;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--bg-3);
    border: 1px solid var(--border);
    color: var(--text-2);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    display: grid;
    place-items: center;
}

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

.modal-content h2 {
    font-size: 1.4rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    color: #fff;
    text-align: left;
}

.modal-content h3 {
    font-size: 0.8rem;
    font-weight: 700;
    margin: 1.5rem 0 0.5rem;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    text-align: left;
}

.modal-content p {
    color: var(--text-2);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 0.5rem;
    text-align: left;
}

.modal-content ul {
    list-style: none;
    padding: 0;
    margin-bottom: 0.75rem;
    text-align: left;
}

.modal-content ul li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.4rem;
    font-size: 0.88rem;
    color: var(--text-2);
}

.modal-content ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.5em;
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
}

.modal-content code {
    display: block;
    background: var(--bg-3);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: #F87171;
    margin: 0.5rem 0;
    border-left: 3px solid var(--primary);
    text-align: left;
}

.modal-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--primary);
    color: #fff;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.9rem;
    text-decoration: none;
    transition: background 0.2s;
}

.modal-cta:hover {
    background: var(--primary-dark);
}

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

/* ============================================================
   Examples (Tool auto-fill)
   ============================================================ */
.tool-examples {
    margin: 1rem 0 1.5rem;
    text-align: center;
}

.examples-label {
    font-size: 0.75rem;
    color: var(--text-3);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.examples-btns {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.example-btn {
    background: var(--bg-3);
    border: 1px solid var(--border-2);
    color: var(--text-2);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

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

/* ============================================================
   Recent Tools Bar
   ============================================================ */
.recent-tools-bar {
    background: var(--bg-2);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 0;
    font-size: 0.8rem;
    color: var(--text-3);
    overflow-x: auto;
    white-space: nowrap;
}

.recent-tools-bar .container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.recent-tools-bar strong {
    color: var(--text-2);
    font-weight: 600;
    flex-shrink: 0;
}

.recent-tools-bar a {
    color: var(--text-3);
    padding: 0.25rem 0.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    transition: all 0.2s;
    flex-shrink: 0;
}

.recent-tools-bar a:hover {
    color: var(--primary);
    border-color: var(--primary);
}

/* ============================================================
   Ad Containers
   ============================================================ */
.ad-container {
    margin: 2rem auto;
    max-width: 900px;
    text-align: center;
    overflow: hidden;
    min-height: 100px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.ad-container .ad-label {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-3);
    margin-bottom: 0.5rem;
    text-align: center;
    opacity: 0.7;
}

.ad-container ins.adsbygoogle {
    display: block !important;
    width: 100% !important;
    margin: 0 auto;
}

.ad-main,
.ad-home-mid,
.ad-home-bottom,
.ad-in-content,
.ad-below-result,
.ad-blog-mid,
.ad-blog-bottom,
.ad-category-mid {
    margin: 2.5rem auto;
    max-width: 728px;
}

.ad-home-mid,
.ad-home-bottom {
    margin: 3rem auto;
    max-width: 970px;
}

.ad-below-result {
    margin: 2rem auto 3rem;
    max-width: 728px;
}

.ad-sidebar {
    display: none;
}

@media (min-width: 1100px) {
    .ad-sidebar {
        display: block;
        position: sticky;
        top: 100px;
        max-width: 300px;
        margin: 0;
    }
}

.ad-container:empty {
    display: none;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
    background: var(--bg-2);
    border-top: 1px solid var(--border);
    margin-top: auto;
    padding-top: 2.5rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
    gap: 2rem;
    padding-bottom: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-grid > div {
    text-align: left;
}

.footer-grid h4 {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #fff;
    margin-bottom: 0.85rem;
    text-align: left;
}

.footer-grid a {
    display: block;
    font-size: 0.82rem;
    color: var(--text-2);
    padding: 0.2rem 0;
    text-align: left;
}

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

.footer-brand p {
    font-size: 0.82rem;
    color: var(--text-2);
    margin-top: 0.75rem;
    max-width: 320px;
    text-align: left;
}

.footer-brand .logo {
    justify-content: flex-start;
}

.footer-bottom {
    background: var(--bg);
    border-top: 1px solid var(--border);
    padding: 1.5rem 0;
    text-align: center;
    font-size: 0.78rem;
    color: var(--text-3);
}

.footer-bottom p {
    margin-bottom: 0.35rem;
    text-align: center;
}

.footer-bottom strong {
    color: var(--text-2);
}

/* ============================================================
   Error Page
   ============================================================ */
.error-page {
    text-align: center;
    padding: 4rem 0;
    flex: 1;
}

.error-page .code {
    font-size: 5.5rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.error-page h2 {
    font-size: 1.75rem;
    margin: 1rem 0 0.5rem;
    text-align: center;
}

.error-page p {
    color: var(--text-2);
    max-width: 520px;
    margin: 0 auto 2rem;
    text-align: center;
}

/* ============================================================
   Utility Classes
   ============================================================ */
.text-center {
    text-align: center;
}

.mt-1 {
    margin-top: 1rem;
}

.mt-2 {
    margin-top: 2rem;
}

.mb-1 {
    margin-bottom: 1rem;
}

.mb-2 {
    margin-bottom: 2rem;
}

.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

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

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    background: var(--bg-2);
}

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

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

/* ============================================================
   Responsive Design
   ============================================================ */

/* Tablet: 992px */
@media (max-width: 992px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr 1fr;
        gap: 1.5rem;
    }

    .hero h1 {
        font-size: 2.1rem;
    }

    .legal-header h1 {
        font-size: 1.9rem;
    }

    .blog-post-header h1 {
        font-size: 1.75rem;
    }
}

/* Small tablet: 860px */
@media (max-width: 860px) {
    .hero-form {
        grid-template-columns: 1fr;
        max-width: 100%;
    }

    .hero-form button {
        width: 100%;
    }

    .tool-grid {
        grid-template-columns: 1fr;
        max-width: 600px;
    }

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

    .how-steps {
        grid-template-columns: 1fr;
        max-width: 600px;
    }

    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Mobile: 768px */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .main-nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-2);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: 0.75rem 1.25rem;
        display: none;
        gap: 0.15rem;
        width: 100%;
        z-index: 100;
    }

    .main-nav.open {
        display: flex;
    }

    .main-nav a {
        width: 100%;
        padding: 0.65rem 0.5rem;
        text-align: center;
    }

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

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

    .hero p {
        font-size: 0.95rem;
    }

    .section {
        padding: 2rem 0;
    }

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

    .filter-tabs {
        overflow-x: auto;
        flex-wrap: nowrap;
        justify-content: flex-start;
        padding-bottom: 0.5rem;
    }

    .filter-tab {
        flex-shrink: 0;
    }

    .calculator {
        padding: 1.25rem;
        max-width: 100%;
    }

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

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

    .calc-btns .btn {
        width: 100%;
    }

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

    .tool-header-icon {
        width: 60px;
        height: 60px;
    }

    .result-main .value {
        font-size: 1.9rem;
    }

    .detail-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .blog-grid {
        grid-template-columns: 1fr;
        max-width: 600px;
    }

    .blog-post-header h1 {
        font-size: 1.5rem;
    }

    .blog-post-content h2 {
        font-size: 1.3rem;
    }

    .blog-post-content {
        font-size: 0.95rem;
    }

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

    .backup-steps-grid {
        grid-template-columns: 1fr;
    }

    .legal-header h1 {
        font-size: 1.6rem;
    }

    .legal-content {
        font-size: 0.9rem;
    }

    .legal-content h2 {
        font-size: 1.15rem;
    }

    .legal-content h3 {
        font-size: 0.95rem;
    }

    .contact-form .form-row {
        grid-template-columns: 1fr;
    }

    .ad-container {
        margin: 1.5rem auto;
        max-width: 100%;
        min-height: 100px;
    }

    .ad-main,
    .ad-home-mid,
    .ad-home-bottom,
    .ad-in-content,
    .ad-below-result,
    .ad-blog-mid,
    .ad-blog-bottom,
    .ad-category-mid {
        max-width: 100%;
        margin: 1.5rem auto;
    }

    .tool-content {
        padding: 1.5rem;
    }

    .tool-content h2 {
        font-size: 1.25rem;
    }

    .modal-content {
        padding: 1.5rem;
        max-height: 90vh;
    }

    .modal-content h2 {
        font-size: 1.15rem;
    }
}

/* Small mobile: 480px */
@media (max-width: 480px) {
    .container {
        padding: 0 0.9rem;
    }

    .hero {
        padding: 2rem 0 1.5rem;
    }

    .hero h1 {
        font-size: 1.4rem;
    }

    .hero p {
        font-size: 0.88rem;
    }

    .hero-steps {
        flex-direction: column;
        gap: 0.5rem;
        align-items: center;
    }

    .category-grid {
        grid-template-columns: 1fr;
        max-width: 320px;
    }

    .section-header h2 {
        font-size: 1.35rem;
    }

    .tool-page h1 {
        font-size: 1.35rem;
    }

    .result-main .value {
        font-size: 1.6rem;
    }

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

    .logo {
        font-size: 1rem;
    }

    .logo svg {
        width: 34px !important;
        height: 34px !important;
    }

    .blog-post-header h1 {
        font-size: 1.35rem;
    }

    .blog-post-content h2 {
        font-size: 1.15rem;
    }

    .blog-post-content h3 {
        font-size: 1rem;
    }

    .blog-post-content ul,
    .blog-post-content ol {
        padding-left: 1.15rem;
    }

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

    .error-page h2 {
        font-size: 1.4rem;
    }

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

/* Extra small: 360px */
@media (max-width: 360px) {
    .container {
        padding: 0 0.75rem;
    }

    .hero h1 {
        font-size: 1.25rem;
    }

    .logo {
        font-size: 0.9rem;
    }

    .logo svg {
        width: 30px !important;
        height: 30px !important;
    }

    .btn {
        padding: 0.65rem 1.25rem;
        font-size: 0.8rem;
    }
}

/* ============================================================
   Print Styles
   ============================================================ */
@media print {
    .site-header,
    .site-footer,
    .search-box,
    .hero-form,
    .calc-btns,
    .nav-toggle,
    .ad-container,
    .result-actions,
    .main-nav,
    .filter-tabs,
    .quick-filters,
    .recent-tools-bar,
    .related-tools,
    .modal-overlay,
    .theme-toggle {
        display: none !important;
    }

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

    .calculator,
    .results,
    .tool-card,
    .blog-card,
    .tool-content,
    .legal-content {
        border: 1px solid #ddd;
        background: #fff;
        color: #000;
    }

    .result-main .value {
        color: #000;
    }

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

    .tool-page {
        padding: 0;
    }
}

/* ============================================================
   Reduced Motion
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}