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

:root {
  /* Matching template palette */
  --palette-black: #0a0a0a;
  --palette-gray-900: #171717;
  --palette-gray-800: #262626;
  --palette-gray-700: #404040;
  --palette-gray-600: #525252;
  --palette-gray-500: #737373;
  --palette-gray-400: #a3a3a3;
  --palette-gray-300: #d4d4d4;
  --palette-gray-200: #e5e5e5;
  --palette-gray-100: #f5f5f5;
  --palette-white: #fafafa;

  /* Dark theme (default for docs) */
  --color-bg: var(--palette-gray-800);
  --color-bg-sidebar: var(--palette-gray-900);
  --color-text: var(--palette-gray-100);
  --color-text-muted: var(--palette-gray-400);
  --color-link: var(--palette-white);
  --color-link-hover: var(--palette-gray-300);
  --color-accent: var(--palette-white);
  --color-accent-muted: var(--palette-gray-300);
  --color-border: var(--palette-gray-700);
  --color-code-bg: var(--palette-gray-900);
  --color-separator-line: var(--palette-gray-400);

  --font-body: "Merriweather", Georgia, "Times New Roman", serif;
  --font-sans:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", Consolas, monospace;

  --sidebar-width: 280px;
  --content-max-width: 800px;

  --spacing-xs: 3px;
  --spacing-sm: 6px;
  --spacing-md: 8px;
  --spacing-lg: 10px;
  --spacing-xl: 12px;
  --spacing-xxl: 15px;
  --spacing-huge: 30px;
  --spacing-massive: 60px;
}

/* Light theme */
.light {
  --color-bg: var(--palette-gray-200);
  --color-bg-sidebar: var(--palette-gray-100);
  --color-text: var(--palette-gray-900);
  --color-text-muted: var(--palette-gray-600);
  --color-link: var(--palette-black);
  --color-link-hover: var(--palette-gray-700);
  --color-accent: var(--palette-black);
  --color-accent-muted: var(--palette-gray-700);
  --color-border: var(--palette-gray-300);
  --color-code-bg: var(--palette-gray-300);
  --color-separator-line: var(--palette-gray-600);
}

/* BASE */
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.centered {
  text-align: center;
}

/* Layout */
.layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  overflow-y: auto;
  background: var(--color-bg-sidebar);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.site-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
}

.sidebar-nav {
  flex: 1;
  padding: 1rem 0;
  overflow-y: auto;
}

.nav-section {
  margin-bottom: 1.5rem;
}

.nav-section-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  padding: 0 1.5rem;
  margin: 0 0 0.5rem 0;
}

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

.nav-item a {
  display: block;
  padding: 0.4rem 1.5rem;
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.9rem;
  transition:
    background 0.15s,
    color 0.15s;
}

.nav-item a:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-link);
}

.nav-item a.active {
  color: var(--color-accent);
  background: var(--color-bg);
  border-right: 2px solid var(--color-accent);
}

/* Collapsible nav sections */
.nav-section {
  margin-bottom: 0.5rem;
}

.nav-section-title {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  padding: 0.5rem 1.5rem;
  margin: 0;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-section-title::-webkit-details-marker {
  display: none;
}

.nav-section-title::before {
  content: "▶";
  font-size: 0.6em;
  transition: transform 0.2s ease;
}

details.nav-section[open] > .nav-section-title::before {
  transform: rotate(90deg);
}

.nav-section-title:hover {
  color: var(--color-text);
}

.nav-section .nav-list {
  margin: 0;
  padding: 0;
}

.nav-section-link {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  text-decoration: none;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  padding: 0.5rem 1.5rem;
  display: block;
  margin-left: 1.3em;
}

.nav-section-link:hover {
  color: var(--color-link-hover);
}

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

/* Footer icon row */

.sidebar-footer {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--color-border);
}

.icon-link {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.4rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text-muted);
}

.icon-link:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
  text-decoration: none;
}

.theme-toggle,
.icon-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text-muted);
  cursor: pointer;
}

.theme-toggle:hover,
.icon-link:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
  text-decoration: none;
}

/* Show/hide sun and moon icons */
.icon-moon {
  display: none;
}
.light .icon-sun {
  display: none;
}
.light .icon-moon {
  display: block;
}

/* Main Content */
.content {
  margin-left: var(--sidebar-width);
  flex: 1;
  padding: 3rem;
}

article {
  max-width: var(--content-max-width);
}

/* Typography */
h1,
h2,
h3,
h4 {
  color: var(--color-text);
  font-weight: 600;
  line-height: 1.3;
}

h1 {
  font-size: 2rem;
  margin: 0 0 1.5rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

h2 {
  font-size: 1.4rem;
  margin: 2.5rem 0 1rem 0;
}

h3 {
  font-size: 1.1rem;
  margin: 2rem 0 0.75rem 0;
}

p {
  margin: 0 0 1rem 0;
}

a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}

a:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

hr {
  border-top: 1px solid var(--color-separator-line);
  width: 50%;
  margin: 0 auto;
  margin-top: var(--spacing-huge);
  margin-bottom: var(--spacing-huge);
}

/* Code */
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-code-bg);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

pre {
  background: var(--color-code-bg);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 0 0 1.5rem 0;
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
}

/* Blockquote */
.content blockquote {
  border-left: 3px solid var(--color-accent);
  margin: 2rem 0;
  padding: 0.5rem 0 0.5rem 1rem;
  font-style: normal;
}

.content blockquote p {
  margin: 0;
}

/* Images */
.content img {
  max-width: min(750px, 100%);
  height: auto;
  display: block;
  margin: 1rem auto;
  border: 1px solid var(--color-text);
  border-radius: 4px;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.5rem 0;
}

th,
td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  font-weight: 600;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* Lists */
ul,
ol {
  margin: 0 0 1rem 0;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.25rem;
}

/* Table of Contents */
.toc {
  background: var(--color-bg-sidebar);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: var(--spacing-md) var(--spacing-lg);
  margin-bottom: var(--spacing-huge);
}

.toc summary {
  font-weight: 600;
  cursor: pointer;
  padding: var(--spacing-sm) 0;
}

.toc ul {
  margin: var(--spacing-md) 0 0 0;
  padding-left: var(--spacing-huge);
  list-style: none;
}

.toc li {
  margin: var(--spacing-xs) 0;
}

.toc .toc-h3 {
  padding-left: var(--spacing-huge);
}

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

.toc a:hover {
  color: var(--color-link);
  text-decoration: underline;
}

/* Index page hero buttons */
.hero-links {
  margin: 1.5em 0;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.hero-nav {
  text-align: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.6em 1.2em;
  text-decoration: none;
  border-radius: 4px;
  font-weight: 600;
}

.btn:hover {
  text-decoration: none;
}

.btn svg {
  flex-shrink: 0;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
}

.btn-primary:hover {
  background: var(--color-accent-muted);
  color: var(--color-bg);
}

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

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

/* Devlog */
.devlog-date {
  font-size: 0.9em;
  color: var(--color-text-muted);
  font-style: italic;
}

/* Screen readers */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--color-background);
  color: var(--color-accent-primary);
  padding: 0.5rem 1rem;
  text-decoration: none;
  font-weight: bold;
}

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

/* Mobile */
.mobile-header {
  display: none;
}

@media (max-width: 768px) {
  .mobile-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    padding: 0 1rem;
    background: var(--color-bg-sidebar);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
  }

  .mobile-title {
    font-weight: 600;
    font-size: 1rem;
  }

  .menu-toggle {
    background: none;
    border: none;
    color: var(--color-text);
    padding: 0.25rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .sidebar {
    position: fixed;
    top: 56px;
    left: 0;
    width: 280px;
    height: calc(100vh - 56px);
    height: calc(100dvh - 56px);
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    z-index: 99;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-header {
    display: none;
  }

  .content {
    margin-left: 0;
    padding: 1.5rem;
    padding-top: calc(56px + 1.5rem);
  }

  .layout {
    flex-direction: column;
  }

  /* Overlay when menu is open */
  .menu-overlay {
    display: none;
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 98;
  }

  .menu-overlay.open {
    display: block;
  }
}