/* ==========================================================================
   Design Tokens & Themes
   ========================================================================== */

:root {
  --font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto;

  --bg-color: #0F0F14;
  --surface-color: #141419;
  --border-color: #2A2F3A;
  --text-color: #ABABB6;
  --highlighted-color: #FAFAFA;
  --accent-color: #16D7E1;
  --inline-code-bg-color: #2A2F3A;
  --inline-code-color: #16D7E1;
  --block-code-bg-color: #0F0F14;
  --block-code-color: #ABABB6;
  --callout-color: var(--accent-color);

  --toc-width: 220px;
  --toc-padding: 1.25rem;
  --toc-font-size: 0.9rem;
  --toc-top-offset: 4rem;
  --border-radius: 7px;
}

[data-theme="light"] {
  --bg-color: #F8F9FA;
  --surface-color: #FFFFFF;
  --border-color: #E2E8F0;
  --text-color: #64646E;
  --highlighted-color: #3C3C41;
  --accent-color: #11A6AD;
  --inline-code-bg-color: #F8F9FA;
  --inline-code-color: #11A6AD;
  --block-code-bg-color: #F8F9FA;
  --block-code-color: #64646E;
  --callout-color: var(--accent-color);
}

/* ==========================================================================
   Reset & Base Rules
   ========================================================================== */

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

body {
  line-height: 1.7;
  font-family: var(--font-family), sans-serif;
  color: var(--text-color);
  background-color: var(--bg-color);
  transition: background-color 0.2s ease, color 0.2s ease;
}

section {
  margin-bottom: 3rem;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  padding: 0;
  line-height: 1.2;
  font-weight: 350;
  color: var(--highlighted-color);
}

p {
  margin-bottom: 1rem;
}

/* Images */

img {
  display: block;
  margin-left: auto;
  margin-right: auto;
}

.image-gallery {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.image-gallery img {
  width: calc(50% - 1rem);
  height: auto;
  display: block;
}

/* Tables */

div.table-container {
  margin-top: 1.5rem;
  margin-bottom: 2.5rem;
  overflow-x: auto;
}

table {
  border-collapse: collapse;
  text-align: left;
  margin-left: auto;
  margin-right: auto;
}

caption {
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

th {
  text-align: center;
}

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

td.not-applicable {
  text-align: center;
}

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

/* Base Code & Formatting */

code {
  font-family: monospace;
}

:not(pre) > code {
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  color: var(--inline-code-color);
  background-color: var(--inline-code-bg-color);
}

pre {
  padding: 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--block-code-color);
  background: var(--block-code-bg-color);
  overflow-x: auto;
}

pre code {
  white-space: pre;
  line-height: 1.5;
}

var {
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-style: italic;
  font-family: inherit;
}

/* ==========================================================================
   Layout
   ========================================================================== */

.site-layout {
  display: grid;
  grid-template-columns: var(--toc-width) minmax(0, 1fr) var(--toc-width);
  gap: 1.25rem;
  max-width: 1500px;
  min-height: 100vh;
  margin: 0 auto;
  padding: 0 3rem 2rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  grid-column: 1 / -1;
  grid-row: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-color);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.site-header ul {
  display: flex;
  align-items: center;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header ul a {
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--highlighted-color);
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.site-header ul a:hover,
.site-header ul a:active {
  color: var(--bg-color);
  background: var(--highlighted-color);
  border-color: var(--highlighted-color);
}

.main-toc { grid-column: 1; grid-row: 2; }
.sub-toc  { grid-column: 3; grid-row: 2; }

.content {
  grid-column: 2;
  grid-row: 2;
  min-width: 0;
  min-height: 120vh;
  padding: 2.5rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background: var(--surface-color);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.site-footer {
  grid-column: 1 / -1;
  grid-row: 3;
  margin-top: 4rem;
  padding-top: 2rem;
  padding-bottom: 2rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-color);
  text-align: center;
}

.site-footer p {
  margin-bottom: 0.75rem;
}

.site-footer a {
  color: var(--highlighted-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.footer-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li:not(:last-child)::after {
  content: "•";
  margin-left: 1rem;
  color: var(--border-color);
}

.sticky-box {
  position: sticky;
  top: var(--toc-top-offset);
  align-self: start;
  max-height: calc(100vh - (var(--toc-top-offset) * 2));
  padding: var(--toc-padding);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  overflow-y: auto;
  background: var(--surface-color);
  font-size: var(--toc-font-size);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

/* ==========================================================================
   Components & Widgets
   ========================================================================== */

/* Brand & Header Controls */

.brand-box {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--highlighted-color);
  font-size: 1.5rem;
  text-decoration: none;
}

.brand-box img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.theme-toggle-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--text-color);
  font-family: inherit;
  font-size: var(--toc-font-size);
  cursor: pointer;
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* TOC Component */

.toc h3 {
  margin-bottom: 0.4rem;
  color: var(--highlighted-color);
  font-size: 0.85rem;
  font-weight: 700;
  line-height: 1.7;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.toc ul {
  margin-bottom: 1.6rem;
  list-style: none;
}

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

.toc ul ul {
  margin-top: 0.4rem;
  margin-bottom: 0.4rem;
  padding-left: 1rem;
}

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

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

/* Callout Boxes */

.callout {
  margin: 3rem 0;
  padding: 0.85rem 1.15rem;
  border-left: 4px solid var(--callout-color);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  background-image: linear-gradient(
      140deg,
      rgba(0, 242, 254, 0.1),
      rgba(76, 122, 238, 0.1),
      rgba(143, 0, 255, 0.1),
      rgba(224, 23, 122, 0.1),
      rgba(255, 102, 0, 0.1)
  );
  color: var(--text-color);
}

.callout-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--callout-color);
}

.callout-title svg {
  fill: currentColor;
  flex-shrink: 0;
}

.callout p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Code Snippets */

.code-snippet {
  position: relative;
  margin-top: 2rem;
  margin-bottom: 2rem;
  font: 14px/1.5 Consolas, Monaco, monospace;
}

.code-snippet pre {
  display: block;
  margin: 0;
}

.code-snippet code {
  display: block;
}

.copy-button {
  position: absolute;
  top: 1rem;
  right: 1rem;
  border: none;
  background: transparent;
  color: var(--text-color);
  font-size: 16px;
  cursor: pointer;
}

.kw    { color: var(--inline-code-color); }
.name  { color: #777dea; }
.lit   { color: #FF6600; }
.comm  { color: #858585; }
.tag   { color: #777dea; }
.attr  { color: var(--inline-code-color); }
.str   { color: #FF6600; }
.punct { color: #858585; opacity: 0.7; }

/* Utilities */

.transparent {
  border: none !important;
  background: transparent !important;
}

/* ==========================================================================
   SPA Mechanics
   ========================================================================== */

.page { display: none; }
.page.active { display: block; }

.sub-toc-group { display: none; }
.sub-toc-group.active { display: block; }

/* ==========================================================================
   Intra-Page Rules
   ========================================================================== */

.page h1,
.page h2,
.page h3,
.page h4,
.page h5,
.page h6,
.page section {
  scroll-margin-top: 6rem;
}

.page h1 { font-size: 2.8rem; margin-bottom: 4rem; }
.page h2 { font-size: 1.8rem; margin-bottom: 2rem; margin-top: 3rem; }
.page h3 { font-size: 1.4rem; margin-bottom: 1.5rem; margin-top: 2.5rem; }
.page h4 { font-size: 1.1rem; margin-bottom: 1rem; margin-top: 2rem; font-weight: 500; }

.page a {
  color: var(--accent-color);
  text-decoration: underline;
  text-underline-offset: 0.25rem;
}

.page ol, .page ul {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

.page ol { list-style-type: decimal; }
.page ul { list-style-type: disc; }

.page li > ul,
.page li > ol {
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
  padding-left: 1.25rem;
}

.page li > p {
  margin-top: 0.35rem;
  margin-bottom: 0.5rem;
}

.page img {
  border-radius: var(--border-radius);
}

/* ==========================================================================
   Standalone Start Page View
   ========================================================================== */

body.start-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
}

body.start-page main {
  max-width: 600px;
  padding: 2rem;
  text-align: center;
  margin-top: auto;
  margin-bottom: auto;
}

body.start-page main .logo {
  width: 145px;
  height: 145px;
}

body.start-page main h1 {
  color: var(--highlighted-color);
}

body.start-page main p {
  margin-top: 1.5rem;
  margin-bottom: 2.5rem;
  font-size: 1.6rem;
}

body.start-page main .links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

body.start-page main a {
  padding: 0.6rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-weight: 600;
  color: var(--highlighted-color);
  text-decoration: none;
  transition: 0.2s;
}

body.start-page main a:hover,
body.start-page main a:active {
  color: var(--bg-color);
  background: var(--highlighted-color);
}

body.start-page .site-footer {
  border: none;
}

/* ==========================================================================
   Media Queries
   ========================================================================== */

@media (max-width: 1270px) {
  .main-toc { grid-column: 1; grid-row: 2; }
  .content  { grid-column: 2 / -1; grid-row: 2; min-width: 0; }
  .sub-toc  { display: none; }
}

@media (max-width: 1010px) {
  .site-layout {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 0 1rem 1rem;
  }

  .site-header ul {
    position: inherit;
    left: inherit;
    transform: none;
  }

  .sticky-box {
    position: static;
    max-height: none;
  }

  .main-toc { grid-column: 1; grid-row: 2; }
  .content  { grid-column: 1; grid-row: 3; }
  .sub-toc  { display: none; }

  .site-footer {
    grid-column: 1 / -1;
    grid-row: 4;
  }
}