:root {
  /* Colors */
  --bg-color: #fff;
  --card-bg-color: #ffffff;
  --text-color: #1d1d1f;
  --secondary-text-color: #86868b;
  --link-color: #007aff;
  --border-color: #e6e6e6;
  --subdued-bg: #f5f5f7;
  --code-bg: #f5f5f7;
  --hero-background-start: #ffffff;
  --hero-background-stop: #f2f2f2;
  
  /* Typography */
  --font-family: "SF Pro Text", "SF Pro Icons", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-size-base: 1.0625rem; /* 17px */
  --line-height-base: 1.47059;
  
  /* Layout */
  --header-height: 52px;
  --sidebar-width: 280px;
  --content-max-width: 1024px;
  --article-max-width: 740px;
  --content-padding: 40px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #000000;
    --card-bg-color: #1c1c1e;
    --text-color: #f5f5f7;
    --secondary-text-color: #86868b;
    --link-color: #2997ff;
    --border-color: #424245;
    --subdued-bg: #1d1d1f;
    --code-bg: #1d1d1f;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--text-color);
  background-color: var(--bg-color);
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
}

/* Layout Grid */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--bg-color);
}

/* Article View Styling */
.guide-header {
  background-color: var(--card-bg-color);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 30px;
  position: sticky;
  top: 0;
  z-index: 90;
}

.guide-header-container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.guide-title {
  font-size: 1.1875rem;
  font-weight: 600;
  color: var(--text-color);
}

.guide-actions a {
  font-size: 0.8125rem;
  color: var(--secondary-text-color);
}

.article-main {
  background-color: var(--card-bg-color);
  padding: 40px 20px 100px;
  min-height: calc(100vh - var(--header-height) - 45px);
}

.article-container {
  max-width: 980px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
}

.sidebar-aside {
  display: none; /* Hidden for the centered reading view per screenshot */
}

.content-body-container {
  flex: 1;
  max-width: 740px;
  background-color: transparent;
  border-radius: 0;
  padding: 0;
  box-shadow: none;
  margin-bottom: 0;
}

.inline-toc-link {
  margin-bottom: 12px;
}

.inline-toc-link a {
  color: var(--link-color);
  font-size: 1.0625rem;
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
}

.inline-toc-link a:hover {
  text-decoration: underline;
}

.content-header {
  margin-bottom: 30px;
}

.content-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-top: 10px;
  margin-bottom: 24px;
  line-height: 1.1;
  letter-spacing: -0.022em;
}

.content-body h2 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-top: 48px;
  margin-bottom: 16px;
  line-height: 1.2;
}

.content-body p {
  font-size: 1.0625rem;
  line-height: 1.5;
  margin-bottom: 24px;
  color: var(--text-color);
}

.content-body ul {
  padding-left: 24px;
  margin-bottom: 24px;
}

.content-body li {
  margin-bottom: 12px;
  line-height: 1.5;
}

.content-body a {
  color: var(--link-color);
  text-decoration: none;
}

.content-body a:hover {
  text-decoration: underline;
}

/* Disclosure / Accordion Styling */
.apple-disclosure {
  border-top: 1px solid var(--border-color);
  margin: 0;
}

.apple-disclosure:last-of-type {
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 40px;
}

.disclosure-summary {
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0;
  cursor: pointer;
  outline: none;
}

.disclosure-summary::-webkit-details-marker {
  display: none;
}

.disclosure-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-color);
  letter-spacing: -0.015em;
}

.disclosure-icon {
  color: var(--link-color);
  transition: transform 0.2s ease;
}

.apple-disclosure[open] .disclosure-icon {
  transform: rotate(180deg);
}

.disclosure-content {
  padding-bottom: 30px;
}

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

/* See Also Styling */
.see-also {
  margin-top: 80px;
}

.see-also h2 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 20px;
  border: none;
  padding: 0;
}

.see-also-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.see-also-list li {
  margin-bottom: 12px;
}

.see-also-list a {
  font-size: 1.0625rem;
  color: var(--link-color);
  text-decoration: none;
}

.see-also-list a:hover {
  text-decoration: underline;
}

/* Article Footer Styling */
.global-footer {
  background-color: var(--bg-color);
  border-top: 1px solid var(--border-color);
  padding: 30px 0 60px;
  margin-top: auto;
}

.global-footer-container {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 30px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  font-size: 0.75rem;
  color: var(--secondary-text-color);
  gap: 20px;
  flex-wrap: wrap;
}

.footer-copyright {
  margin-right: 20px;
}

.footer-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-color);
  text-decoration: none;
}

.footer-links a:not(:last-child)::after {
  content: "|";
  margin-left: 12px;
  color: var(--border-color);
  cursor: default;
}

.footer-links a:hover {
  text-decoration: underline;
}

@media (max-width: 768px) {
  .footer-bottom {
    flex-direction: column;
    gap: 10px;
  }
}



#menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-color);
  cursor: pointer;
  padding: 0;
  margin-right: 15px;
}

.sidebar-aside {
  display: none; /* Hidden on desktop article view */
}

@media (max-width: 1024px) {
  #menu-toggle {
    display: block;
  }
  
  .sidebar-aside {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 300px;
    height: 100vh;
    z-index: 200;
    background-color: var(--card-bg-color);
    box-shadow: 20px 0 50px rgba(0, 0, 0, 0.1);
    padding: 20px;
    border-right: 1px solid var(--border-color);
  }
  
  .sidebar-aside.show {
    display: block;
  }
}


/* Callouts */
.callout {
  margin: 2.5rem 0;
  padding: 1.5rem 2rem;
  border-radius: 18px;
  background-color: var(--subdued-bg);
  border: none;
}

.callout-label {
  font-weight: 700;
  font-size: 0.75rem;
  margin-bottom: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.callout-note { background-color: rgba(0, 102, 204, 0.05); }
.callout-note .callout-label { color: #0066cc; }

.callout-important { background-color: rgba(255, 149, 0, 0.08); }
.callout-important .callout-label { color: #cc7600; }

.callout-warning { background-color: rgba(255, 59, 48, 0.08); }
.callout-warning .callout-label { color: #d70015; }

/* Media Handling */
img, video {
  max-width: 100%;
  height: auto;
  border-radius: 18px;
  margin: 3rem 0;
  display: block;
}

/* Sidebar Styling */
.sidebar-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-nav li {
  margin-bottom: 4px;
}

.sidebar-nav ul ul {
  padding-left: 12px;
  margin-top: 4px;
  margin-bottom: 12px;
}

.sidebar-nav a {
  color: var(--text-color);
  font-size: 0.9375rem;
  display: block;
  padding: 8px 16px;
  border-radius: 10px;
  transition: background-color 0.2s;
  line-height: 1.3;
}

.sidebar-nav a:hover {
  background-color: rgba(0, 0, 0, 0.05);
  text-decoration: none;
}

@media (prefers-color-scheme: dark) {
  .sidebar-nav a:hover {
    background-color: rgba(255, 255, 255, 0.1);
  }
}

.sidebar-nav a.active {
  background-color: rgba(0, 0, 0, 0.08);
  font-weight: 600;
}

@media (prefers-color-scheme: dark) {
  .sidebar-nav a.active {
    background-color: rgba(255, 255, 255, 0.15);
  }
}

.sidebar-nav strong {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--secondary-text-color);
  margin-top: 2rem;
  margin-bottom: 0.5rem;
  padding: 0 16px;
  letter-spacing: 0.05em;
}

/* Breadcrumbs */
.breadcrumbs {
  font-size: 0.8125rem;
  color: var(--secondary-text-color);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 400;
}

.breadcrumbs a {
  color: var(--secondary-text-color);
}

.breadcrumbs a:hover {
  color: var(--link-color);
  text-decoration: none;
}

.breadcrumbs .separator {
  color: var(--border-color);
  font-size: 0.625rem;
}

.breadcrumbs .current {
  color: var(--secondary-text-color);
}

/* Typography Scale */
h1 a, h2 a, h3 a, h4 a, h5 a, h6 a {
  color: inherit;
  text-decoration: none;
}

h1 { 
  font-size: 2.5rem; 
  font-weight: 700; 
  margin-bottom: 2rem; 
  letter-spacing: -0.022em; 
  line-height: 1.1; 
  color: var(--text-color);
}

h2 { 
  font-size: 2rem; 
  font-weight: 600; 
  margin-top: 3.5rem; 
  margin-bottom: 1.5rem; 
  letter-spacing: -0.021em; 
  line-height: 1.2; 
  color: var(--text-color);
}

h3 { 
  font-size: 1.5rem; 
  font-weight: 600; 
  margin-top: 2.5rem; 
  margin-bottom: 1rem; 
  letter-spacing: -0.019em; 
  line-height: 1.3; 
  color: var(--text-color);
}

p { margin-bottom: 1.5rem; line-height: 1.6; }

@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.625rem; }
  h3 { font-size: 1.25rem; }
}

p { margin-bottom: 1.5rem; line-height: 1.6; }

code {
  font-family: "SF Mono", SFMono-Regular, ui-monospace, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  background-color: var(--code-bg);
  padding: 0.2em 0.4em;
  border-radius: 6px;
  font-size: 0.85em;
  letter-spacing: -0.01em;
}

pre {
  position: relative;
  margin: 2rem 0;
}

pre code {
  display: block;
  padding: 1.5em;
  overflow-x: auto;
  border-radius: 12px;
  line-height: 1.4;
}

.copy-button {
  position: absolute;
  top: 10px;
  right: 10px;
  background-color: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--secondary-text-color);
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.75rem;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s;
}

pre:hover .copy-button {
  opacity: 1;
}

@media (prefers-color-scheme: dark) {
  .copy-button {
    background-color: rgba(0, 0, 0, 0.3);
  }
}

/* Home Layout Specifics */
.home-layout {
  background-color: var(--bg-color);
}

.home-layout .app-container {
  display: flex;
  flex-direction: column;
}

.home-main {
  display: block;
  padding: 0;
}

.hero-section {
  padding: 80px 20px;
  border-bottom: 1px solid var(--border-color);
  background-color: transparent;
  background-image: linear-gradient(to bottom,var(--hero-background-start) 0,var(--hero-background-stop) 100%);
}

@media (prefers-color-scheme: dark) {
  .hero-section {
    background-color: var(--bg-color);
  }
}

.hero-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 980px;
  margin: 0 auto;
  gap: 60px;
}

.hero-text {
  flex: 1;
}

.hero-section h1 {
  margin-bottom: 8px;
  color: var(--text-color);
  font-size: 3rem;
  line-height: 1.04167;
  font-weight: 500;
  letter-spacing: .006em;
}

.hero-section h1 + p {
  margin-top: 0px;
}

.hero-section h1 a {
  color: inherit;
  text-decoration: none;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--secondary-text-color);
  margin-bottom: 32px;
  font-weight: 400;
}

.hero-toc-link {
  font-size: 1.1875rem;
  color: var(--link-color);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-weight: 400;
}

.hero-toc-link:hover {
  text-decoration: underline;
}

.hero-app-icon {
  flex-shrink: 0;
}

.hero-app-icon svg {
  filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.12));
}

.home-content {
  max-width: 980px;
  margin: 0 auto;
  padding: 80px 20px;
  display: flex;
  flex-direction: column;
  gap: 120px;
}

.feature-row {
  display: flex;
  align-items: center;
  gap: 80px;
}

.feature-row:nth-child(even) {
  flex-direction: row-reverse;
}

.feature-image {
  flex: 1.2;
}

.feature-text {
  flex: 1;
}

.feature-text h2 {
  font-size: 2.25rem;
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--text-color);
}

.feature-text p {
  font-size: 1.0625rem;
  line-height: 1.5;
  color: var(--text-color);
  margin-bottom: 20px;
}

.feature-link {
  font-size: 1.0625rem;
  color: var(--link-color);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

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

.bottom-summary {
  margin-top: 80px;
  font-size: 1.1875rem;
  color: var(--secondary-text-color);
  line-height: 1.47059;
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
  max-width: 800px;
}

.bottom-summary p {
  margin-bottom: 24px;
}

.bottom-summary a {
  color: var(--link-color);
  text-decoration: underline;
}

.bottom-nav {
  display: flex;
  justify-content: flex-end;
  margin-top: 24px;
  margin-bottom: 100px;
}

.nav-next {
  text-align: right;
  color: var(--text-color);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-next:hover .nav-title {
  text-decoration: underline;
}

.nav-label {
  font-size: 0.75rem;
  color: var(--text-color);
  display: block;
  margin-bottom: 0px;
  font-weight: 400;
}

.nav-title {
  font-size: 1.1875rem;
  font-weight: 600;
  color: var(--link-color);
}

@media (max-width: 900px) {
  .hero-container {
    flex-direction: column-reverse;
    text-align: center;
    gap: 40px;
  }
  
  .feature-row, .feature-row:nth-child(even) {
    flex-direction: column;
    gap: 40px;
  }
  
  .hero-section h1 {
    font-size: 2.25rem;
  }
  
  .feature-text h2 {
    font-size: 1.75rem;
  }
}


/* Table of Contents Modal */
.toc-modal {
  border: none;
  border-radius: 20px;
  padding: 0;
  max-width: 800px;
  width: 90%;
  height: 80vh;
  max-height: 80vh;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  background-color: var(--card-bg-color);
  color: var(--text-color);
  overflow: hidden;
  margin: auto;
}

.toc-modal[open] {
  display: flex;
  flex-direction: column;
}

.toc-modal::backdrop {
  background-color: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.toc-modal-header {
  padding: 24px 24px 0;
  display: flex;
  flex-shrink: 0;
  justify-content: flex-start;
  background-color: var(--card-bg-color);
  z-index: 10;
}

.toc-close-button {
  background: none;
  border: none;
  color: var(--secondary-text-color);
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s;
}

.toc-close-button:hover {
  background-color: var(--subdued-bg);
  color: var(--text-color);
}

.toc-modal-content {
  padding: 0 60px 60px;
  overflow-y: auto;
  flex: 1;
  min-height: 0;
}

.toc-modal-title {
  font-size: 1.75rem; /* 28px */
  font-weight: 600;
  margin-bottom: 2rem;
  color: var(--text-color);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.5rem;
}

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

.toc-modal-nav .toc-list .toc-list {
  padding-left: 1.5rem;
}

.toc-item {
  margin-bottom: 0.5rem;
}

.toc-details {
  width: 100%;
}

.toc-summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  padding: 8px 0;
  color: var(--link-color);
  font-weight: 500;
  font-size: 1.25rem; /* 20px */
}

.toc-summary::-webkit-details-marker {
  display: none;
}

.toc-expander {
  transition: transform 0.2s ease;
  color: var(--link-color);
}

.toc-details[open] > .toc-summary .toc-expander {
  transform: rotate(90deg);
}

.toc-link {
  color: var(--link-color);
  text-decoration: none;
  font-size: 1.0625rem; /* 17px */
  padding: 6px 0;
  display: inline-block;
}

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

.toc-link.active {
  font-weight: 600;
  color: var(--text-color);
}

.toc-text {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--link-color);
}

/* Modal Triggers */
.toc-trigger {
  background: none;
  border: none;
  padding: 0;
  font-family: inherit;
  cursor: pointer;
  color: var(--link-color);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: inherit;
  font-weight: inherit;
}

.toc-trigger:hover {
  text-decoration: underline;
}

.hero-toc-link.toc-trigger {
  font-size: 1.1875rem; /* 19px */
}

.inline-toc-link .toc-trigger {
  font-size: 1.0625rem; /* 17px */
}

@media (max-width: 768px) {
  .toc-modal-content {
    padding: 0 24px 40px;
  }
  
  .toc-modal-title {
    font-size: 1.5rem;
  }
}

/* Category Page Styling */
.category-sections {
  margin-top: 2rem;
  border-top: 1px solid var(--border-color);
}

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

.category-item {
  border-bottom: 1px solid var(--border-color);
}

.category-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 0;
  color: var(--text-color);
  font-weight: 500;
  transition: color 0.2s;
  text-decoration: none;
}

.category-link:hover {
  color: var(--link-color);
  text-decoration: none;
}

.category-item-title {
  font-size: 1.125rem;
}

.category-item-chevron {
  color: var(--secondary-text-color);
  opacity: 0.5;
}

.category-link:hover .category-item-chevron {
  color: var(--link-color);
  opacity: 1;
}