/* ═══════════════════════════════════════════════════════════════
   AdSense Mastery — Enciclopedia Definitiva
   Design System & Full Stylesheet v2.0
   Refactored for AdSense Approval Compliance
   ═══════════════════════════════════════════════════════════════ */

/* ── DESIGN TOKENS ── */
:root {
    --bg-color: #0a0e1a;
    --bg-surface: #0f172a;
    --card-bg: #1e293b;
    --card-bg-hover: #263548;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --accent-glow: rgba(59, 130, 246, 0.15);
    --accent-secondary: #a78bfa;
    --accent-green: #34d399;
    --accent-amber: #fbbf24;
    --accent-rose: #fb7185;
    --border: #1e293b;
    --border-light: #334155;
    --code-bg: #070b14;
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.5);
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
    --sidebar-width: 320px;
    --header-height: 64px;
}

/* ── RESET & BASE ── */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    scroll-padding-top: calc(var(--header-height) + 20px);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.75;
    min-height: 100vh;
    overflow-x: hidden;
}

::selection {
    background: var(--accent);
    color: white;
}

::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 10px;
}

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

/* ── HEADER & NAVIGATION ── */
header {
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border);
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--header-height);
}

.logo {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.5px;
    white-space: nowrap;
    flex-shrink: 0;
}

.logo span {
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Main nav */
nav {
    display: flex;
    gap: 0;
    align-items: center;
    height: 100%;
    flex-wrap: nowrap;
}

/* Nav items (both buttons and dropdown wrappers) */
.nav-item {
    position: relative;
    height: 100%;
    display: flex;
    align-items: center;
}

.nav-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: 'Inter', sans-serif;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    padding: 0.5rem 0.9rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    position: relative;
    text-decoration: none;
}

.nav-btn:hover {
    color: var(--text-main);
    background: rgba(59, 130, 246, 0.08);
}

.nav-btn.active {
    color: white;
    background: var(--accent);
    box-shadow: 0 0 20px var(--accent-glow);
}

.nav-btn .arrow {
    font-size: 0.6rem;
    transition: transform var(--transition-fast);
    margin-left: 2px;
    padding: 0.3rem;
    cursor: pointer;
    border-radius: 4px;
}

.nav-btn .arrow:hover {
    background: rgba(255, 255, 255, 0.1);
}

.nav-item:hover .arrow,
.nav-item.open .arrow {
    transform: rotate(180deg);
}

/* Dropdown menus */
.nav-item:last-child .dropdown-menu {
    right: 0;
    left: auto;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 240px;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-lg);
    z-index: 500;
}

.nav-item:hover .dropdown-menu,
.nav-item.open .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a,
.dropdown-menu button {
    display: block;
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    padding: 0.85rem 1rem 0.85rem 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.02);
    border-radius: 0;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.dropdown-menu a:last-child,
.dropdown-menu button:last-child {
    border-bottom: none;
}

.dropdown-menu a:hover,
.dropdown-menu button:hover {
    background: var(--accent-glow);
    color: var(--text-main);
    padding-left: 2.3rem;
}

.dropdown-menu a.active,
.dropdown-menu button.active {
    background: var(--accent);
    color: white;
}

/* Mobile hamburger */
.hamburger {
    display: none;
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

/* ── LAYOUT WITH SIDEBAR ── */
.layout-wrapper {
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
    gap: 2rem;
    padding: 2.5rem 2rem 4rem;
    min-height: calc(100vh - var(--header-height) - 100px);
}

.main-content {
    flex: 1;
    min-width: 0;
}

/* ── SIDEBAR ── */
.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.sidebar-widget {
    background: linear-gradient(145deg, var(--card-bg), rgba(30, 41, 59, 0.6));
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    position: relative;
    overflow: visible;
}

.sidebar-widget::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(to right, var(--accent), var(--accent-secondary));
    opacity: 0.6;
}

.sidebar-widget h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 1rem;
    padding-bottom: 0.6rem;
    border-bottom: 1px solid var(--border);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.85rem;
}

/* Search widget */
.sidebar-search {
    position: relative;
}

.sidebar-search input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.75rem;
    background: var(--bg-color);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    transition: border-color var(--transition-fast);
    outline: none;
}

.sidebar-search input::placeholder {
    color: var(--text-dim);
}

.sidebar-search input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.sidebar-search .search-icon {
    position: absolute;
    left: 0.9rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-dim);
    font-size: 1rem;
    pointer-events: none;
}

.search-results {
    margin-top: 0.75rem;
    max-height: 300px;
    overflow-y: auto;
    display: none;
}

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

.search-result-item {
    padding: 0.6rem 0.75rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition-fast);
    border-bottom: 1px solid var(--border);
}

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

.search-result-item:hover {
    background: var(--accent-glow);
}

.search-result-item .result-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
}

.search-result-item .result-section {
    font-size: 0.75rem;
    color: var(--text-dim);
    margin-top: 0.15rem;
}

/* Categories widget */
.categories-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.categories-list li {
    margin-bottom: 0;
}

.categories-list li a,
.categories-list li button {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 0.55rem 0.75rem;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    font-size: 0.9rem;
    border: none;
    background: none;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    text-align: left;
}

.categories-list li a:hover,
.categories-list li button:hover {
    background: var(--accent-glow);
    color: var(--text-main);
    padding-left: 1rem;
}

.categories-list .cat-count {
    font-size: 0.75rem;
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent-hover);
    padding: 0.1rem 0.5rem;
    border-radius: 999px;
    font-weight: 600;
}

/* CTA / Newsletter widget */
.cta-widget {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.12), rgba(167, 139, 250, 0.08));
    border-color: rgba(59, 130, 246, 0.25);
}

.cta-widget h4 {
    border-bottom: 1px solid rgba(59, 130, 246, 0.2);
}

.cta-widget p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.cta-widget .newsletter-form {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.cta-widget .newsletter-form input {
    width: 100%;
    padding: 0.7rem 1rem;
    background: var(--bg-color);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    outline: none;
    transition: border-color var(--transition-fast);
}

.cta-widget .newsletter-form input:focus {
    border-color: var(--accent);
}

.cta-widget .newsletter-form .btn-primary {
    padding: 0.7rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.cta-widget .newsletter-form .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

/* Social widget */
.social-links {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: var(--radius-md);
    background: var(--bg-color);
    border: 1px solid var(--border-light);
    color: var(--text-muted);
    text-decoration: none;
    font-size: 1.1rem;
    transition: all var(--transition-fast);
}

.social-link:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--accent-glow);
}

/* Popular articles widget */
.popular-list {
    list-style: none;
    padding: 0;
    margin: 0;
    counter-reset: popular;
}

.popular-list li {
    counter-increment: popular;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    cursor: pointer;
    transition: opacity var(--transition-fast);
}

.popular-list li:hover {
    opacity: 0.8;
}

.popular-list li:last-child {
    border-bottom: none;
}

.popular-list li::before {
    content: counter(popular);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    height: 28px;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
    margin-top: 2px;
}

.popular-list li .popular-title {
    font-size: 0.85rem;
    color: var(--text-main);
    font-weight: 500;
    line-height: 1.4;
}

.popular-list li .popular-meta {
    font-size: 0.7rem;
    color: var(--text-dim);
    margin-top: 0.15rem;
}

/* ── MAIN CONTENT AREA ── */
.content-section {
    display: none;
    animation: fadeSlideIn 0.5s ease-out;
}

.content-section.active {
    display: block;
}

@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── TYPOGRAPHY ── */
h1 {
    font-size: clamp(2.2rem, 5vw, 3.2rem);
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, #60a5fa 0%, #a78bfa 50%, #f472b6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

h2 {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border);
    color: var(--text-main);
    position: relative;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 60px;
    height: 2px;
    background: linear-gradient(to right, var(--accent), var(--accent-secondary));
    border-radius: 2px;
}

h3 {
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--accent-hover);
    margin: 2rem 0 0.75rem;
    letter-spacing: -0.3px;
}

h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-secondary);
    margin: 1.5rem 0 0.5rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.8;
}

.subtitle {
    font-size: 1.15rem;
    margin-bottom: 3rem;
    color: var(--text-dim);
    max-width: 700px;
}

article {
    margin-bottom: 2rem;
}

/* ── LISTS ── */
ul,
ol {
    margin-left: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-muted);
}

li {
    margin-bottom: 0.6rem;
    line-height: 1.7;
}

li::marker {
    color: var(--accent);
}

strong {
    color: var(--text-main);
    font-weight: 600;
}

em {
    color: var(--accent-secondary);
    font-style: italic;
}

/* ── CARDS GRID ── */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
    margin-bottom: 3rem;
}

.seo-content {
    margin-top: 3rem;
}

.card {
    background: linear-gradient(145deg, var(--card-bg), rgba(30, 41, 59, 0.6));
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    transition: all var(--transition-normal);
    cursor: default;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(to right, var(--accent), var(--accent-secondary));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
    border-color: rgba(59, 130, 246, 0.3);
}

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

.card h3 {
    margin-top: 0;
    font-size: 1.2rem;
}

.card p {
    font-size: 0.95rem;
    margin-bottom: 0;
}

/* Clickable cards */
.card.clickable {
    cursor: pointer;
}

.card.clickable:hover {
    border-color: var(--accent);
}

/* ── CODE BLOCKS ── */
.code-block {
    background: var(--code-bg);
    padding: 1.25rem 1.5rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    margin: 1.25rem 0;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--accent-green);
    line-height: 1.6;
    position: relative;
}

.code-block::before {
    content: attr(data-lang);
    position: absolute;
    top: 0.5rem;
    right: 0.75rem;
    font-size: 0.7rem;
    text-transform: uppercase;
    color: var(--text-dim);
    letter-spacing: 1px;
    font-family: 'Inter', sans-serif;
}

.code-block code {
    font-family: inherit;
    white-space: pre-wrap;
    word-break: break-word;
}

/* Inline code */
p code,
li code,
td code {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-hover);
    padding: 0.15rem 0.45rem;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.85em;
    border: 1px solid rgba(59, 130, 246, 0.15);
}

/* ── INFO BOXES / CALLOUTS ── */
.info-box {
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
    border-left: 4px solid;
    position: relative;
}

.info-box.tip {
    background: rgba(52, 211, 153, 0.08);
    border-color: var(--accent-green);
}

.info-box.tip .info-box-title {
    color: var(--accent-green);
}

.info-box.warning {
    background: rgba(251, 191, 36, 0.08);
    border-color: var(--accent-amber);
}

.info-box.warning .info-box-title {
    color: var(--accent-amber);
}

.info-box.danger {
    background: rgba(251, 113, 133, 0.08);
    border-color: var(--accent-rose);
}

.info-box.danger .info-box-title {
    color: var(--accent-rose);
}

.info-box.note {
    background: rgba(59, 130, 246, 0.08);
    border-color: var(--accent);
}

.info-box.note .info-box-title {
    color: var(--accent);
}

.info-box-title {
    font-weight: 700;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.4rem;
}

.info-box p {
    margin-bottom: 0;
    font-size: 0.95rem;
}

/* ── TABLES ── */
.table-wrapper {
    overflow-x: auto;
    margin: 1.5rem 0;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

thead {
    background: rgba(59, 130, 246, 0.1);
}

th {
    text-align: left;
    padding: 0.85rem 1.2rem;
    font-weight: 600;
    color: var(--accent-hover);
    border-bottom: 2px solid var(--border);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

td {
    padding: 0.75rem 1.2rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-muted);
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background: rgba(59, 130, 246, 0.04);
}

/* ── FORMULA BLOCKS ── */
.formula-block {
    background: linear-gradient(135deg, rgba(167, 139, 250, 0.08), rgba(59, 130, 246, 0.08));
    border: 1px solid rgba(167, 139, 250, 0.2);
    border-radius: var(--radius-md);
    padding: 1.5rem 2rem;
    margin: 1.5rem 0;
    text-align: center;
}

.formula-block .formula {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    color: var(--accent-secondary);
    font-weight: 600;
    margin: 0.75rem 0;
    letter-spacing: 1px;
}

.formula-block .formula-desc {
    font-size: 0.85rem;
    color: var(--text-dim);
    margin-bottom: 0;
}

/* ── SECTION HERO BANNERS ── */
.section-hero {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(167, 139, 250, 0.05));
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    margin-bottom: 2.5rem;
    position: relative;
    overflow: hidden;
}

.section-hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, var(--accent-glow), transparent 70%);
    pointer-events: none;
}

.section-hero h2 {
    border: none;
    padding-bottom: 0;
    margin-bottom: 0.75rem;
}

.section-hero h2::after {
    display: none;
}

.section-hero p {
    max-width: 750px;
    font-size: 1.05rem;
}

/* ── STEP LISTS ── */
.step-list {
    counter-reset: step;
    list-style: none;
    margin-left: 0;
    padding-left: 0;
}

.step-list li {
    counter-increment: step;
    position: relative;
    padding-left: 3.5rem;
    margin-bottom: 1.5rem;
}

.step-list li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 2.2rem;
    height: 2.2rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    color: white;
}

/* ── TAGS / BADGES ── */
.tag {
    display: inline-block;
    padding: 0.2rem 0.65rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tag.blue {
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent-hover);
}

.tag.green {
    background: rgba(52, 211, 153, 0.15);
    color: var(--accent-green);
}

.tag.amber {
    background: rgba(251, 191, 36, 0.15);
    color: var(--accent-amber);
}

.tag.rose {
    background: rgba(251, 113, 133, 0.15);
    color: var(--accent-rose);
}

.tag.purple {
    background: rgba(167, 139, 250, 0.15);
    color: var(--accent-secondary);
}

/* ── DIVIDERS ── */
.section-divider {
    border: none;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border-light), transparent);
    margin: 3rem 0;
}

/* ── PROGRESS METRIC BARS ── */
.metric-bar {
    margin: 1rem 0;
}

.metric-bar .metric-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    margin-bottom: 0.4rem;
}

.metric-bar .metric-label span:first-child {
    color: var(--text-main);
    font-weight: 500;
}

.metric-bar .metric-label span:last-child {
    color: var(--accent);
    font-weight: 600;
}

.metric-bar .bar {
    height: 6px;
    background: var(--border);
    border-radius: 999px;
    overflow: hidden;
}

.metric-bar .bar-fill {
    height: 100%;
    border-radius: 999px;
    background: linear-gradient(to right, var(--accent), var(--accent-secondary));
    transition: width 1s ease;
}

/* ── ACCORDION ── */
.accordion-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin-bottom: 0.75rem;
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.accordion-item:hover {
    border-color: var(--border-light);
}

.accordion-item.open {
    border-color: rgba(59, 130, 246, 0.3);
}

.accordion-trigger {
    width: 100%;
    background: var(--card-bg);
    border: none;
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    padding: 1rem 1.5rem;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background var(--transition-fast);
}

.accordion-trigger:hover {
    background: var(--card-bg-hover);
}

.accordion-trigger .icon {
    font-size: 0.8rem;
    transition: transform var(--transition-fast);
    color: var(--accent);
}

.accordion-item.open .accordion-trigger .icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    background: rgba(15, 23, 42, 0.5);
}

.accordion-item.open .accordion-content {
    max-height: 2000px;
    padding: 1.25rem 1.5rem;
}

.accordion-content p:last-child {
    margin-bottom: 0;
}

/* ── GRID LAYOUTS ── */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 1.5rem 0;
}

.three-col {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin: 1.5rem 0;
}

/* ── STAT CARDS ── */
.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    text-align: center;
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-card .stat-label {
    font-size: 0.85rem;
    color: var(--text-dim);
    margin-top: 0.25rem;
}

/* ── CHECKLIST ── */
.checklist {
    list-style: none;
    margin-left: 0;
    padding-left: 0;
}

.checklist li {
    padding: 0.6rem 0;
    padding-left: 2rem;
    position: relative;
    border-bottom: 1px solid var(--border);
}

.checklist li:last-child {
    border-bottom: none;
}

.checklist li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-green);
    font-weight: 700;
    font-size: 1.1rem;
}

/* ── QUOTE BLOCKS ── */
.quote-block {
    border-left: 3px solid var(--accent);
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    background: rgba(59, 130, 246, 0.05);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-style: italic;
    color: var(--text-muted);
}

.quote-block cite {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-dim);
    font-style: normal;
    font-weight: 600;
}

/* ── BACK TO TOP BUTTON ── */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--accent);
    color: white;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
    z-index: 500;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 25px rgba(59, 130, 246, 0.5);
}

/* ── FOOTER ── */
footer {
    border-top: 1px solid var(--border);
    margin-top: 4rem;
    color: var(--text-dim);
    font-size: 0.9rem;
    background: var(--bg-surface);
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 3rem 2rem 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2.5rem;
    margin-bottom: 2.5rem;
}

.footer-col h5 {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer-col p {
    font-size: 0.85rem;
    color: var(--text-dim);
    line-height: 1.7;
    margin-bottom: 0.75rem;
}

.footer-col ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-col ul li {
    margin-bottom: 0.4rem;
}

.footer-col ul li a,
.footer-col ul li button {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color var(--transition-fast);
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
}

.footer-col ul li a:hover,
.footer-col ul li button:hover {
    color: var(--accent);
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-bottom: 0;
}

.footer-bottom-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.footer-bottom-links a,
.footer-bottom-links button {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    transition: color var(--transition-fast);
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
}

.footer-bottom-links a:hover,
.footer-bottom-links button:hover {
    color: var(--accent);
}

/* ── READING PROGRESS BAR ── */
.reading-progress {
    position: fixed;
    top: var(--header-height);
    left: 0;
    height: 3px;
    background: linear-gradient(to right, var(--accent), var(--accent-secondary), var(--accent-rose));
    z-index: 999;
    transition: width 0.1s linear;
    width: 0%;
}

/* ── TOC (Table of Contents) inside sections ── */
.toc {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem 2rem;
    margin-bottom: 2.5rem;
}

.toc h4 {
    margin-top: 0;
    color: var(--text-main);
    font-size: 1rem;
    margin-bottom: 1rem;
}

.toc ol {
    margin: 0;
    padding-left: 1.5rem;
}

.toc li {
    margin-bottom: 0.4rem;
}

.toc a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
    font-size: 0.95rem;
}

.toc a:hover {
    color: var(--accent);
}

/* ── TRUST PAGES (About, Contact, Legal, Privacy, Cookies) ── */
.trust-page {
    max-width: 800px;
}

.trust-page h2 {
    font-size: 1.8rem;
}

.trust-page h3 {
    font-size: 1.2rem;
    margin-top: 2rem;
}

.trust-page p {
    font-size: 0.95rem;
    line-height: 1.85;
}

.trust-page ul,
.trust-page ol {
    margin-bottom: 1.5rem;
}

.trust-page ul li,
.trust-page ol li {
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

/* Contact form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-top: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.85rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

.form-group select option {
    background: var(--card-bg);
    color: var(--text-main);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
}

.submit-btn {
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 1px;
    align-self: flex-start;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

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

.form-note {
    font-size: 0.8rem;
    color: var(--text-dim);
    line-height: 1.5;
}

/* About page */
.about-team {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.team-member {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    text-align: center;
    transition: all var(--transition-normal);
}

.team-member:hover {
    transform: translateY(-4px);
    border-color: rgba(59, 130, 246, 0.3);
    box-shadow: var(--shadow-card);
}

.team-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 1rem;
}

.team-member h4 {
    color: var(--text-main);
    margin: 0 0 0.25rem;
    font-size: 1rem;
}

.team-member .role {
    font-size: 0.8rem;
    color: var(--accent);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.team-member p {
    font-size: 0.85rem;
    margin-top: 0.75rem;
    margin-bottom: 0;
    color: var(--text-dim);
}

/* Timeline / Mission */
.mission-values {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.value-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    text-align: center;
    transition: border-color var(--transition-normal);
}

.value-card:hover {
    border-color: rgba(59, 130, 246, 0.3);
}

.value-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.value-card h4 {
    color: var(--text-main);
    margin: 0 0 0.5rem;
}

.value-card p {
    font-size: 0.85rem;
    margin-bottom: 0;
    color: var(--text-dim);
}

/* ── COOKIE BANNER ── */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--border-light);
    padding: 1.25rem 2rem;
    z-index: 2000;
    display: none;
    animation: slideUp 0.4s ease;
}

.cookie-banner.visible {
    display: block;
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
    }

    to {
        transform: translateY(0);
    }
}

.cookie-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    flex-wrap: wrap;
}

.cookie-text {
    flex: 1;
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
    min-width: 250px;
}

.cookie-text a {
    color: var(--accent);
    text-decoration: underline;
}

.cookie-actions {
    display: flex;
    gap: 0.75rem;
    flex-shrink: 0;
}

.cookie-btn {
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius-sm);
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
}

.cookie-btn.accept {
    background: var(--accent);
    color: white;
}

.cookie-btn.accept:hover {
    background: var(--accent-hover);
}

.cookie-btn.reject {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border-light);
}

.cookie-btn.reject:hover {
    border-color: var(--text-muted);
    color: var(--text-main);
}

/* ── IMAGE PLACEHOLDERS ── */
.content-img {
    width: 100%;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    margin: 1.5rem 0;
    display: block;
    background: var(--card-bg);
    min-height: 180px;
    object-fit: cover;
}

.img-caption {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-top: -1rem;
    margin-bottom: 1.5rem;
    font-style: italic;
}

/* ── BREADCRUMBS ── */
.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-dim);
    flex-wrap: wrap;
}

.breadcrumbs button {
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    cursor: pointer;
    padding: 0;
    transition: color var(--transition-fast);
}

.breadcrumbs a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumbs a:hover {
    color: var(--accent);
}

.breadcrumbs .sep {
    color: var(--text-dim);
}

.breadcrumbs .current {
    color: var(--accent-hover);
    font-weight: 500;
}

/* ── CASOS DE ÉXITO ── */
.case-study {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-bottom: 2rem;
    transition: border-color var(--transition-normal);
}

.case-study:hover {
    border-color: rgba(59, 130, 246, 0.3);
}

.case-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.case-header h3 {
    margin: 0;
}

.case-metrics {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.case-metric {
    text-align: center;
}

.case-metric .metric-val {
    font-size: 1.4rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.case-metric .metric-lbl {
    font-size: 0.7rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ── HERRAMIENTAS GRID ── */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0;
}

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

.tool-card:hover {
    transform: translateY(-3px);
    border-color: rgba(59, 130, 246, 0.3);
    box-shadow: var(--shadow-card);
}

.tool-card .tool-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.tool-card h4 {
    color: var(--text-main);
    margin: 0 0 0.25rem;
    font-size: 1.05rem;
}

.tool-card .tool-type {
    font-size: 0.75rem;
    color: var(--accent);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.75rem;
}

.tool-card p {
    font-size: 0.85rem;
    margin-bottom: 0;
    color: var(--text-dim);
}

/* ── RESPONSIVE ── */
@media (max-width: 1100px) {
    .layout-wrapper {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        flex-direction: row;
        flex-wrap: wrap;
    }

    .sidebar-widget {
        flex: 1 1 280px;
    }

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

@media (max-width: 900px) {
    .two-col {
        grid-template-columns: 1fr;
    }

    .three-col {
        grid-template-columns: 1fr;
    }

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

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

@media (max-width: 768px) {
    header {
        padding: 0 1rem;
    }

    .hamburger {
        display: block;
    }

    nav {
        position: absolute;
        top: 100%;
        left: -1rem;
        width: 100vw;
        height: calc(100vh - var(--header-height));
        background: rgba(10, 14, 26, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 1.5rem;
        gap: 0.25rem;
        overflow-y: auto;
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
        align-items: stretch;
    }

    nav.mobile-open {
        transform: translateX(0);
    }

    .nav-item {
        height: auto;
        flex-direction: column;
        align-items: stretch;
        width: 100%;
    }

    .nav-btn {
        width: 100%;
        justify-content: space-between;
        padding: 1rem 1rem;
        font-size: 1.1rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        border-radius: 0;
    }

    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        background: rgba(30, 41, 59, 0.3);
        padding: 0;
        display: none;
        min-width: 100%;
        width: 100%;
    }

    .dropdown-menu button {
        padding: 0.85rem 1rem 0.85rem 2rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.02);
    }

    .nav-item.open .dropdown-menu {
        display: block;
    }

    .layout-wrapper {
        padding: 1.5rem 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    .section-hero {
        padding: 1.5rem;
    }

    .sidebar {
        flex-direction: column;
    }

    .sidebar-widget {
        flex: 1 1 100%;
    }

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

    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }

    .footer-bottom-links {
        justify-content: center;
    }

    .footer-bottom-links button,
    .footer-bottom-links a {
        padding: 0.5rem;
    }

    .cookie-inner {
        flex-direction: column;
        text-align: center;
    }

    .cookie-actions {
        width: 100%;
        justify-content: center;
    }

    .case-header {
        flex-direction: column;
    }

    .breadcrumbs {
        font-size: 0.78rem;
    }
}

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

    .stat-card .stat-value {
        font-size: 1.5rem;
    }

    .about-team {
        grid-template-columns: 1fr;
    }

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

    .case-metrics {
        width: 100%;
        justify-content: space-between;
    }
}
/* ── SEARCH RESULTS CONTAINER ── */
.search-results-container {
    position: absolute;
    top: calc(100% + 5px);
    left: 0;
    width: 100%;
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    max-height: 350px;
    overflow-y: auto;
    z-index: 10000;
}

.search-results-container.hidden {
    display: none;
}

.search-results-container .search-result-item {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border);
    transition: background-color var(--transition-fast);
}

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

.search-results-container .search-result-item:hover {
    background-color: var(--card-bg-hover);
}

.sidebar-search {
    position: relative;
}

/* ── ADSENSE PLACEHOLDER (WPO - CLS Prevention) ── */
/* PRODUCCIÓN: placeholders ocultos para revisión de AdSense.
   Para reactivar, eliminar la línea "display: none !important;" */
.adsense-placeholder {
    display: none !important;
    width: 100%;
    min-height: 250px;
    background-color: var(--card-bg);
    border: 1px dashed var(--border);
    border-radius: var(--radius-md);
    justify-content: center;
    align-items: center;
    margin: 2rem 0;
    position: relative;
    overflow: hidden;
}

.adsense-placeholder::before {
    content: 'Espacio Publicitario';
    color: var(--text-dim);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

@media (max-width: 768px) {
    .adsense-placeholder {
        min-height: 90px;
    }
}