/* Curso SQL - Estilos (solo CSS, sin Tailwind) */
:root {
    --color-bg: #ffffff;
    --color-bg-main: #ffffff;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    --color-border-card: #dbe0e6;
    --color-slate-100: #f1f5f9;
    --color-slate-200: #e2e8f0;
    --color-slate-300: #cbd5e1;
    --color-slate-400: #94a3b8;
    --color-slate-500: #64748b;
    --color-slate-600: #475569;
    --color-slate-700: #334155;
    --color-slate-800: #1e293b;
    --color-slate-900: #0f172a;
    --color-primary: #0c77f2;
    --color-primary-hover: #0a63cb;
    --color-hero-btn: #daff3e;
    --color-hero-btn-hover: #3588dd;
    --color-text-dark: #111418;
    --color-text-muted: #60758a;
    --color-footer-bg: #1e293b;
    --color-footer-text: #cbd5e1;
    --font-sans: Inter, 'Noto Sans', sans-serif;
    --max-content: 56rem;
    --radius: 0.5rem;
    --radius-lg: 0.75rem;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--color-bg);
    font-family: var(--font-sans);
    color: var(--color-slate-800);
}

.page-wrap {
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    width: 100%;
    overflow-x: hidden;
}

/* Header: logo + título a la izquierda, nav a la derecha, botón menú en móvil */
.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: nowrap;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    padding: 1rem 1.5rem;
    background-color: var(--color-hero-btn);
}

.site-header-inner {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-slate-900);
}

.site-logo {
    display: block;
    color: var(--color-slate-900);
}

.site-logo:hover {
    color: var(--color-slate-700);
}

.site-logo svg {
    width: 2rem;
    height: 2rem;
    display: block;
}

.site-title {
    display: inline-block;
    margin: 0;
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.025em;
    color: var(--color-slate-900);
}

.site-nav {
    display: none;
    align-items: center;
    gap: 2rem;
}

.site-nav a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-slate-900);
    text-decoration: none;
}

.site-nav a:hover {
    color: var(--color-slate-700);
}

.menu-btn {
    display: flex;
    padding: 0.35rem;
    background: transparent;
    color: var(--color-slate-900);
    border: 1px solid rgba(0, 0, 0, 0.2);
    border-radius: var(--radius);
    cursor: pointer;
}

.menu-btn:hover {
    background: rgba(0, 0, 0, 0.06);
}

@media (min-width: 768px) {
    .site-header {
        padding-left: 2.5rem;
        padding-right: 2.5rem;
    }
    .site-nav {
        display: flex;
    }
    .menu-btn {
        display: none;
    }
}

/* Main */
.site-main {
    flex: 1;
    display: flex;
    justify-content: center;
    padding: 2rem 1rem;
    background: var(--color-bg-main);
}

@media (min-width: 640px) {
    .site-main { padding-left: 2rem; padding-right: 2rem; }
}
@media (min-width: 768px) {
    .site-main { padding: 3rem 4rem; }
}
@media (min-width: 1024px) {
    .site-main { padding-left: 6rem; padding-right: 6rem; }
}
@media (min-width: 1280px) {
    .site-main { padding-left: 10rem; padding-right: 10rem; }
}

.layout-content-container {
    width: 100%;
    max-width: var(--max-content);
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Hero */
.hero {
    min-height: 360px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem 1rem 2rem;
    border-radius: var(--radius-lg);
    background-color: #ffffff;
    border: 1px solid var(--color-border-card);
}

.hero-inner {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
    align-items: center;
    width: 100%;
}

.hero-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-icon svg {
    width: 4.5rem;
    height: 4.5rem;
    color: var(--color-slate-700);
}

@media (min-width: 768px) {
    .hero-icon svg {
        width: 6rem;
        height: 6rem;
    }
}

.hero-title {
    margin: 0;
    font-size: 2.25rem;
    font-weight: 900;
    line-height: 1.2;
    letter-spacing: -0.033em;
    color: #1e293b;
}

.hero-subtitle {
    margin: 0;
    font-size: 0.875rem;
    font-weight: 400;
    line-height: 1.5;
    color: #334155;
    max-width: 42rem;
    align-self: center;
}

.btn-hero {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    height: 2.5rem;
    padding: 0 1rem;
    border-radius: 0.75rem;
    background: var(--color-hero-btn);
    color: #334155;
    font-size: 0.875rem;
    font-weight: 700;
    letter-spacing: 0.015em;
    text-decoration: none;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: background 0.2s;
}

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

@media (min-width: 768px) {
    .hero {
        min-height: 480px;
        padding: 2rem 2.5rem 2.5rem;
        border-radius: 0.75rem;
    }
    .hero-title {
        font-size: 3rem;
    }
    .hero-subtitle {
        font-size: 1rem;
    }
    .btn-hero {
        height: 3rem;
        padding: 0 1.5rem;
        font-size: 1rem;
    }
}

/* Section cards */
.section-card {
    background: var(--color-surface);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

#instructor.section-card {
    box-shadow: none;
    border: none;
}

/* Página de error 404 */
.error-page {
    text-align: center;
    padding: 3rem 2rem;
}
.error-page-title {
    margin: 0 0 0.5rem;
    font-size: 3rem;
    font-weight: 800;
    line-height: 1;
    color: var(--color-slate-700);
}
.error-page-text {
    margin: 0 0 1.5rem;
    font-size: 1rem;
    color: var(--color-slate-600);
}
.error-page .btn-hero {
    margin-top: 0.5rem;
}

@media (min-width: 768px) {
    .section-card {
        padding: 2rem;
    }
}

.section-title {
    margin: 0 0 1.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-slate-800);
}

/* Qué incluye / Features */
.features-section {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    padding: 2.5rem 1rem;
}

.features-header {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.features-title {
    margin: 0;
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.033em;
    color: var(--color-text-dark);
    max-width: 45rem;
}

@media (min-width: 768px) {
    .features-title {
        font-size: 2.25rem;
        font-weight: 900;
    }
}

.features-desc {
    margin: 0;
    font-size: 1rem;
    color: var(--color-text-dark);
    max-width: 45rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
    gap: 0.75rem;
    padding: 0;
}

@media (max-width: 767px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

.feature-card {
    display: flex;
    flex: 1;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem;
    border: 1px solid var(--color-border-card);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
}

.feature-card .feature-icon {
    color: var(--color-text-dark);
}

.feature-card .feature-icon svg {
    width: 24px;
    height: 24px;
}

.feature-card h2,
.feature-card h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-text-dark);
}

.feature-card p {
    margin: 0;
    font-size: 0.875rem;
    font-weight: 400;
    line-height: 1.5;
    color: var(--color-text-muted);
}

/* Módulos (coherente con hero y qué incluye) */
.modules-section {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    padding: 2.5rem 1rem;
}

.modules-header {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.modules-title {
    margin: 0;
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.033em;
    color: var(--color-text-dark);
    max-width: 45rem;
}

@media (min-width: 768px) {
    .modules-title {
        font-size: 2.25rem;
        font-weight: 900;
    }
}

.modules-desc {
    margin: 0;
    font-size: 1rem;
    color: var(--color-text-muted);
    max-width: 45rem;
}

.module-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.module-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    border: 1px solid var(--color-border-card);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    text-decoration: none;
    color: inherit;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.module-item:hover {
    border-color: #c5ccd4;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.module-icon {
    flex-shrink: 0;
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    background: #f0f2f5;
    color: var(--color-text-dark);
}

.module-icon .material-icons {
    font-size: 1.25rem;
}

.module-item h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-text-dark);
}

.module-item p {
    margin: 0;
    font-size: 0.875rem;
    font-weight: 400;
    line-height: 1.5;
    color: var(--color-text-muted);
}

.modules-footer {
    margin-top: 0;
    padding-top: 0.5rem;
    border-top: none;
}

.modules-footer .btn-hero {
    font-size: 0.875rem;
    height: 2.5rem;
    padding: 0 1rem;
}

.section-footer {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--color-slate-200);
}

.link-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
}

.link-cta:hover {
    text-decoration: underline;
}

/* Blog */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.link-muted {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-primary);
    text-decoration: none;
}

.link-muted:hover {
    text-decoration: underline;
}

.blog-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.blog-item {
    display: block;
    padding: 1rem;
    border: 1px solid var(--color-slate-200);
    border-radius: var(--radius);
    text-decoration: none;
    color: inherit;
    transition: box-shadow 0.2s, border-color 0.2s;
}

.blog-item:hover {
    box-shadow: var(--shadow-md);
    border-color: #cbd5e1;
}

.blog-item h3 {
    margin: 0;
    font-weight: 500;
    line-height: 1.25;
    color: var(--color-slate-800);
}

.blog-item time {
    font-size: 0.75rem;
    color: var(--color-slate-500);
}

.blog-item p {
    margin: 0.25rem 0 0;
    font-size: 0.875rem;
    color: var(--color-slate-600);
}

/* Autor */
.author-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: flex-start;
}

@media (min-width: 640px) {
    .author-section {
        flex-direction: row;
    }
}

.author-avatar {
    flex-shrink: 0;
    width: 6rem;
    height: 6rem;
    border-radius: 50%;
    background: #dbeafe;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
}

.author-avatar img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--color-slate-200);
}

.author-info {
    flex: 1;
}

.author-info h3 {
    margin: 0 0 0.5rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-slate-800);
}

.author-info p {
    margin: 0;
    color: var(--color-slate-600);
}

.author-info .link-cta {
    margin-top: 0.75rem;
}

/* Footer */
.site-footer {
    padding: 2rem 1.5rem;
    background: var(--color-footer-bg);
    color: var(--color-footer-text);
    text-align: center;
}

.site-footer p {
    margin: 0;
    font-size: 0.875rem;
}

@media (min-width: 768px) {
    .site-footer {
        padding-left: 2.5rem;
        padding-right: 2.5rem;
    }
}

/* Article / Page */
.breadcrumb {
    font-size: 0.875rem;
    color: var(--color-slate-600);
}

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

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb-sep {
    margin: 0 0.5rem;
    color: var(--color-slate-500);
}

.breadcrumb-next {
    font-weight: 500;
}

.article-nav-bottom {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-slate-200);
}

.link-next-module {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
}

.link-next-module:hover {
    text-decoration: underline;
}

.article-card {
    background: var(--color-surface);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
}

@media (min-width: 768px) {
    .article-card {
        padding: 2rem;
    }
}

.article-card header {
    margin-bottom: 1.5rem;
}

.article-card h1 {
    margin: 0 0 0.25rem;
    font-size: 1.875rem;
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-slate-900);
}

@media (min-width: 768px) {
    .article-card h1 {
        font-size: 2.25rem;
    }
}

.article-card time {
    font-size: 0.875rem;
    color: var(--color-slate-500);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    font-size: 0.875rem;
    color: var(--color-slate-500);
}

.article-author-link {
    color: #2563eb;
    text-decoration: underline;
}

.article-author-link:hover {
    color: #1d4ed8;
}

.article-nav {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn-prev,
.btn-next {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.5rem;
    border-radius: var(--radius);
    font-size: 0.875rem;
    text-decoration: none;
    transition: background 0.2s;
}

.btn-prev {
    background: #f1f5f9;
    color: var(--color-slate-700);
}

.btn-prev:hover {
    background: #e2e8f0;
}

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

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

.btn-next.push-right {
    margin-left: auto;
}

/* Practice & Progress */
.practice-section,
.progress-section {
    background: var(--color-surface);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

@media (min-width: 768px) {
    .practice-section,
    .progress-section {
        padding: 2rem;
    }
}

.practice-section h2,
.progress-section h2 {
    margin: 0 0 1rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-slate-800);
}

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

#sqlInput {
    width: 100%;
    min-height: 8rem;
    padding: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    background: #f8fafc;
    resize: vertical;
    transition: border-color 0.2s, box-shadow 0.2s;
}

#sqlInput:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(12, 119, 242, 0.1);
}

.btn-run {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.5rem;
    border-radius: var(--radius);
    background: var(--color-primary);
    color: #fff;
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: background 0.2s;
}

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

#queryResult {
    margin-top: 1rem;
    padding: 1rem;
    min-height: 100px;
    background: #f8fafc;
    border-radius: var(--radius);
    overflow-x: auto;
    font-size: 0.875rem;
}

.progress-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.progress-header .progress-badge {
    margin: 0;
}

#progress-percentage {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-primary);
}

.progress-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    border-radius: 9999px;
    background: #dbeafe;
    color: var(--color-primary);
}

.progress-bar-wrap {
    overflow: hidden;
    height: 0.5rem;
    margin-bottom: 1rem;
    border-radius: 9999px;
    background: var(--color-slate-200);
}

#progressBar {
    height: 100%;
    width: 0;
    background: var(--color-primary);
    transition: width 0.5s ease;
}

/* Quiz del módulo */
.quiz-section {
    background: var(--color-surface);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
}

.quiz-section h2 {
    margin: 0 0 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-slate-800);
}

.quiz-skip-link {
    margin: 1.5rem 0 0;
}

.quiz-title {
    margin: 0 0 1rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-slate-800);
}

.quiz-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.quiz-question {
    padding: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: #f8fafc;
}

.quiz-question-text {
    margin: 0 0 0.75rem;
    font-weight: 600;
    color: var(--color-slate-800);
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.quiz-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9375rem;
    color: var(--color-slate-700);
    cursor: pointer;
}

.quiz-option input {
    margin: 0;
}

.quiz-result {
    padding: 1rem;
}

.quiz-result .quiz-title {
    margin-bottom: 0.5rem;
}

.quiz-score {
    margin: 0 0 0.5rem;
    font-size: 1.125rem;
    color: var(--color-slate-800);
}

.quiz-result-pass .quiz-result-msg { color: #15803d; font-weight: 600; }
.quiz-result-fail .quiz-result-msg { color: #b91c1c; font-weight: 600; }

.quiz-result-actions {
    margin-top: 1rem;
    display: flex;
    gap: 0.75rem;
}

@media (min-width: 768px) {
    .quiz-section {
        padding: 2rem;
    }
}

/* Article content (Markdown) */
.article-content h2 { font-size: 1.25rem; font-weight: 700; margin-top: 1.5rem; margin-bottom: 0.5rem; color: #1e293b; }
.article-content h3 { font-size: 1.125rem; font-weight: 600; margin-top: 1rem; margin-bottom: 0.5rem; color: #334155; }
.article-content p { margin-bottom: 0.75rem; color: var(--color-slate-600); }
.article-content img { max-width: 100%; height: auto; display: block; margin: 0.75rem 0; border-radius: var(--radius); }
.article-content ul { list-style-type: disc; padding-left: 1.5rem; margin-bottom: 0.75rem; }
.article-content li { margin-bottom: 0.25rem; }
.article-content pre { background: #1e293b; color: #f8fafc; padding: 1rem; border-radius: var(--radius); overflow-x: auto; margin: 0.75rem 0; }
.article-content code { font-family: 'Menlo', 'Monaco', monospace; background: #f1f5f9; padding: 0.125rem 0.375rem; border-radius: 0.25rem; font-size: 0.875em; }
.article-content pre code { background: none; padding: 0; }
.article-content table { margin: 0.75rem 0; border-collapse: separate; border-spacing: 0; width: 100%; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--color-border); }
.article-content th { background: #f8fafc; padding: 0.5rem 0.75rem; text-align: left; font-weight: 600; }
.article-content td { padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--color-border); }

/* Video YouTube responsive */
.video-responsive {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 */
    height: 0;
    overflow: hidden;
    margin: 1.5rem 0;
    border-radius: var(--radius);
}
.video-responsive iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Category / Blog listing */
.article-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.article-list article {
    background: var(--color-surface);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: box-shadow 0.2s;
}

.article-list article:hover {
    box-shadow: var(--shadow-md);
}

.article-list h2 {
    margin: 0 0 0.25rem;
    font-size: 1.25rem;
    font-weight: 700;
}

.article-list h2 a {
    color: var(--color-slate-800);
    text-decoration: none;
}

.article-list h2 a:hover {
    color: var(--color-primary);
}

.article-list time {
    font-size: 0.875rem;
    color: var(--color-slate-500);
}

.article-list .link-cta {
    margin-top: 0.5rem;
}

/* Forms / inputs */
input[type="radio"] {
    appearance: none;
    width: 1.2rem;
    height: 1.2rem;
    border: 2px solid #cbd5e1;
    border-radius: 50%;
    transition: all 0.2s;
}

input[type="radio"]:checked {
    border-color: var(--color-primary);
    background-color: var(--color-primary);
    box-shadow: inset 0 0 0 3px white;
}

input[type="radio"]:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(12, 119, 242, 0.2);
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: #f8fafc; border-radius: 4px; }
::-webkit-scrollbar-thumb { background: #94a3b8; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #64748b; }

/* Material icons */
.material-icons {
    font-size: 1.25rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.material-icons.lg {
    font-size: 1.125rem;
}

.material-icons.xl {
    font-size: 2.25rem;
}

button::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.3s ease, height 0.3s ease;
}

button:active::after {
    width: 200px;
    height: 200px;
}

button {
    position: relative;
    overflow: hidden;
}

@media (max-width: 768px) {
    .module-item:hover {
        transform: none;
    }
    .article-content pre {
        font-size: 0.875rem;
    }
}