/* TruchiEmu Documentation - Design System */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --accent: #007AFF;
  --accent-hover: #0066d6;
  --accent-light: rgba(0, 122, 255, 0.08);
  --accent-subtle: rgba(0, 122, 255, 0.04);
  --bg: #f8f9fa;
  --bg-card: #ffffff;
  --bg-sidebar: #ffffff;
  --bg-header: rgba(255, 255, 255, 0.85);
  --text-primary: #1a1a2e;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --border: #e5e7eb;
  --border-light: #f0f0f0;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 40px -12px rgba(0, 0, 0, 0.1);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', SFMono-Regular, ui-monospace, monospace;
  --sidebar-width: 260px;
  --header-height: 64px;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

code {
  font-family: var(--font-mono);
  background: var(--accent-light);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.875em;
}

pre code {
  background: none;
  padding: 0;
  border-radius: 0;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-header);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--header-height);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text-primary);
  text-decoration: none;
}

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

.logo img {
  border-radius: 6px;
  width: 28px;
  height: 28px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  padding: 8px 14px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--accent-subtle);
}

.nav-link.active {
  color: var(--accent);
  background: var(--accent-light);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.875rem;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn:active {
  transform: scale(0.97);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
}

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

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

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

.btn-lg {
  padding: 12px 28px;
  font-size: 1rem;
  border-radius: var(--radius-md);
}

.btn-block {
  width: 100%;
  justify-content: center;
}

/* ===== LAYOUT ===== */
.site-container {
  display: flex;
  flex: 1;
  min-height: calc(100dvh - var(--header-height));
}

.main-content {
  flex: 1;
  min-width: 0;
  padding: 40px 48px 60px;
  max-width: 900px;
}

.content-wrapper > * + * {
  margin-top: 1.25rem;
}

.content-wrapper h1,
.content-wrapper h2,
.content-wrapper h3,
.content-wrapper h4 {
  color: var(--text-primary);
  line-height: 1.3;
  font-weight: 700;
}

.content-wrapper h1 {
  font-size: 2.25rem;
  letter-spacing: -0.025em;
  margin-top: 0;
  margin-bottom: 0.75rem;
}

.content-wrapper h2 {
  font-size: 1.625rem;
  letter-spacing: -0.02em;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-light);
}

.content-wrapper h3 {
  font-size: 1.25rem;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}

.content-wrapper p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.content-wrapper ul,
.content-wrapper ol {
  color: var(--text-secondary);
  line-height: 1.7;
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.content-wrapper li {
  margin-bottom: 0.375rem;
}

.content-wrapper li strong {
  color: var(--text-primary);
}

.content-wrapper blockquote {
  border-left: 3px solid var(--accent);
  background: var(--accent-subtle);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.25rem 0;
}

.content-wrapper blockquote p {
  margin-bottom: 0;
}

.content-wrapper hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

.content-wrapper table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.9rem;
}

.content-wrapper th,
.content-wrapper td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
}

.content-wrapper th {
  background: var(--accent-subtle);
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

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

/* ===== SIDEBAR ===== */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  padding: 24px 0;
  overflow-y: auto;
  height: calc(100dvh - var(--header-height));
  position: sticky;
  top: var(--header-height);
  display: flex;
  flex-direction: column;
}

.sidebar-section {
  padding: 0 16px;
  margin-bottom: 20px;
}

.sidebar-section h3 {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 8px;
  padding: 0 8px;
}

.sidebar-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-nav li {
  margin: 0;
}

.sidebar-nav a {
  display: block;
  padding: 6px 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.sidebar-nav a:hover {
  color: var(--text-primary);
  background: var(--accent-subtle);
}

.sidebar-sticky-footer {
  margin-top: auto;
  padding: 16px;
  border-top: 1px solid var(--border);
}

#search-toggle {
  font-size: 0.8125rem;
  padding: 10px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

#search-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

/* ===== SEARCH OVERLAY ===== */
.search-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  align-items: center;
  justify-content: center;
}

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

.search-container {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 24px;
  width: 90%;
  max-width: 560px;
  box-shadow: var(--shadow-xl);
  position: relative;
}

#search-input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

#search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.search-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  padding: 4px;
}

.search-close:hover {
  color: var(--text-primary);
}

#search-results {
  margin-top: 16px;
  max-height: 300px;
  overflow-y: auto;
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 48px 0 32px;
  margin-top: auto;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-section h4 {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.footer-section p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

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

.footer-section ul li {
  margin-bottom: 8px;
}

.footer-section ul a {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.footer-section ul a:hover {
  color: var(--accent);
}

.social-links {
  margin-top: 12px;
}

.social-links a {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

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

.footer-bottom {
  border-top: 1px solid var(--border-light);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.tiny-text {
  font-size: 0.75rem;
}

/* ===== HERO ===== */
.hero {
  padding: 60px 0 40px;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hero-logo {
  width: 56px;
  height: 56px;
  border-radius: 14px;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--text-primary);
}

.hero-tagline {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 8px;
}

.hero-image img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  width: 100%;
}

/* ===== SECTIONS ===== */
.section {
  padding: 60px 0;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-align: center;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  text-align: center;
  max-width: 580px;
  margin: 0 auto 40px;
}

/* ===== FEATURES GRID ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.25s ease;
}

.feature-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 1.75rem;
  margin-bottom: 16px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-light);
  border-radius: var(--radius-md);
}

.feature-card h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== STATS ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.03em;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===== CAROUSEL / SCREENSHOTS ===== */
.screenshot-preview .carousel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.carousel-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.25s ease;
}

.carousel-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.carousel-item img {
  width: 100%;
  border-radius: 0;
  display: block;
}

.carousel-item h4 {
  font-size: 1rem;
  font-weight: 600;
  padding: 16px 16px 0;
}

.carousel-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  padding: 6px 16px 16px;
}

/* ===== CTA SECTION ===== */
.cta-section {
  text-align: center;
  background: var(--accent-subtle);
  border-radius: var(--radius-xl);
  margin: 0 24px 40px;
  padding: 60px 40px;
}

.cta-section h2 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.cta-section p {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto 28px;
}

.cta-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

/* ===== PAGE HEADER (sub-pages) ===== */
.page-header {
  padding: 40px 0 24px;
}

.page-header h1 {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 8px;
}

.page-header .lead {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 640px;
}

/* ===== TOC ===== */
.toc {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 32px;
}

.toc h3 {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
}

.toc li {
  margin: 0;
}

.toc a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

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

/* ===== CONTENT SECTIONS ===== */
.content-section {
  padding: 32px 0;
}

.content-section h2 {
  font-size: 1.625rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-light);
}

/* ===== SYSTEM TOC ===== */
.systems-toc {
  padding: 24px 0 16px;
}

.systems-toc h3 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.system-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.category-link {
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.category-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

/* ===== SYSTEM SECTIONS ===== */
.systems-section {
  padding: 32px 0;
}

.systems-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.system-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.system-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all 0.2s;
}

.system-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.system-card .system-name {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

/* ===== FEATURE DOCS (individual feature pages) ===== */
.feature-docs {
  max-width: 800px;
}

.feature-docs h1 {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 1rem;
}

.feature-overview {
  margin-bottom: 2.5rem;
}

.feature-overview .lead {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.architecture-diagram {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
  margin: 1.5rem 0;
  text-align: center;
}

.architecture-diagram img {
  max-height: 300px;
}

.caption {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.feature-list li {
  margin-bottom: 0.75rem;
}

.setup-steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
}

.setup-steps > li {
  counter-increment: step;
  padding: 20px 0 20px 48px;
  position: relative;
  border-left: 2px solid var(--border);
  margin-left: 20px;
}

.setup-steps > li:last-child {
  border-left-color: transparent;
}

.setup-steps > li::before {
  content: counter(step);
  position: absolute;
  left: -20px;
  top: 18px;
  width: 36px;
  height: 36px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
}

.setup-steps > li strong {
  display: block;
  font-size: 1.0625rem;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.setup-steps > li p {
  margin-bottom: 0.5rem;
}

.setup-steps > li img {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

/* ===== SHADER GRID ===== */
.shader-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin: 1.5rem 0;
}

.shader-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.2s;
}

.shader-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.shader-item img {
  width: 100%;
  display: block;
  border-radius: 0;
}

.shader-item .shader-label {
  padding: 10px 14px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-primary);
  border-top: 1px solid var(--border-light);
}

.shader-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 1.5rem 0;
}

.shader-comparison > div {
  background: var(--bg-card);
  padding: 12px;
}

.shader-comparison img {
  width: 100%;
  display: block;
  border-radius: 0;
}

.shader-comparison .label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  text-align: center;
  padding-top: 8px;
}

/* ===== PAGE META ===== */
.page-meta {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--border-light);
}

.page-meta small {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .features-grid,
  .system-grid,
  .screenshot-preview .carousel {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-content {
    grid-template-columns: 1fr 1fr;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .site-container {
    flex-direction: column;
  }
  
  .sidebar {
    display: none;
  }
  
  .main-content {
    padding: 24px 16px 40px;
  }
  
  .hero .container {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .features-grid,
  .system-grid,
  .screenshot-preview .carousel {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .main-nav .nav-link {
    padding: 6px 10px;
    font-size: 0.8125rem;
  }
  
  .header-actions .btn-outline span {
    display: none;
  }
  
  .content-wrapper h1 {
    font-size: 1.75rem;
  }
  
  .content-wrapper h2 {
    font-size: 1.375rem;
  }
  
  .cta-section {
    margin: 0 16px 24px;
    padding: 40px 24px;
  }
  
  .cta-section h2 {
    font-size: 1.5rem;
  }
  
  .cta-actions {
    flex-direction: column;
  }
  
  .shader-grid,
  .shader-comparison {
    grid-template-columns: 1fr;
  }
  
  .page-header h1 {
    font-size: 1.75rem;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
  }
}