:root {
  --eye-bg: #f8fafc;
  --eye-panel: #ffffff;
  --eye-ink: #111827;
  --eye-muted: #4b5563;
  --eye-line: #e5e7eb;
  --eye-accent: #2563eb;
  --eye-accent-strong: #1d4ed8;
  --eye-secondary: #7c3aed;
  --eye-soft: #eef2ff;
  --eye-code: #0f172a;
  --eye-code-ink: #e5e7eb;
  --eye-success: #047857;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--eye-bg);
}

body,
body.jp-Notebook {
  min-height: 100vh;
  margin: 0;
  color: var(--eye-ink);
  background: var(--eye-bg);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

a {
  color: var(--eye-accent);
  text-decoration-thickness: 0.09em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--eye-secondary);
}

.site-shell,
body.jp-Notebook > main {
  width: min(100% - 2rem, 1120px);
  margin: 0 auto;
}

.site-header {
  min-height: 4.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  border-bottom: 1px solid var(--eye-line);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--eye-ink);
  text-decoration: none;
}

.site-brand:hover {
  color: var(--eye-ink);
}

.site-brand > span:last-child {
  display: grid;
  line-height: 1.15;
}

.site-brand strong {
  font-size: 1.05rem;
}

.site-brand small {
  margin-top: 0.18rem;
  color: var(--eye-muted);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.site-mark {
  width: 2rem;
  height: 2rem;
  flex: 0 0 2rem;
  border: 7px solid var(--eye-ink);
  border-radius: 50%;
  background: var(--eye-panel);
  box-shadow: inset 0 0 0 3px var(--eye-accent);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
}

.site-nav a {
  color: var(--eye-muted);
  font-size: 0.92rem;
  font-weight: 650;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--eye-accent);
}

.overview {
  padding: 3.2rem 0 4rem;
}

.overview-intro {
  max-width: 48rem;
  margin-bottom: 2.4rem;
}

.eyebrow {
  margin: 0 0 0.65rem;
  color: var(--eye-secondary);
  font-size: 0.8rem;
  font-weight: 750;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.overview h1 {
  max-width: 48rem;
  margin: 0;
  font-size: clamp(2.25rem, 6vw, 4.5rem);
  line-height: 1;
  letter-spacing: 0;
}

.lede {
  max-width: 44rem;
  margin: 1.2rem 0 0;
  color: var(--eye-muted);
  font-size: 1.15rem;
}

.notebook-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.notebook-card {
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--eye-line);
  border-radius: 8px;
  background: var(--eye-panel);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.notebook-card:first-child {
  border-top: 3px solid var(--eye-accent);
}

.notebook-number {
  color: var(--eye-secondary);
  font-size: 0.78rem;
  font-weight: 750;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.notebook-card h2 {
  margin: 0.45rem 0 0.55rem;
  font-size: 1.2rem;
  line-height: 1.25;
  letter-spacing: 0;
}

.notebook-card h2 a {
  color: var(--eye-ink);
  text-decoration: none;
}

.notebook-card h2 a:hover {
  color: var(--eye-accent);
}

.notebook-card p {
  margin: 0;
  color: var(--eye-muted);
}

.notebook-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1rem;
  font-size: 0.9rem;
  font-weight: 700;
}

.path-note {
  margin-top: 2.5rem;
  padding: 1rem 1.15rem;
  border-left: 4px solid var(--eye-secondary);
  background: var(--eye-soft);
  color: #3730a3;
}

.path-note p {
  margin: 0;
}

body.jp-Notebook > main > .site-header,
body.jp-Notebook > main > .site-footer {
  width: min(100%, 1120px);
  margin-right: auto;
  margin-left: auto;
}

body.jp-Notebook > main > .jp-Cell {
  width: min(100%, 52rem);
  margin-right: auto;
  margin-left: auto;
}

body.jp-Notebook > main > .site-header + .jp-Cell {
  margin-top: 3rem;
}

.jp-MarkdownCell,
.jp-MarkdownCell .jp-Cell-inputWrapper,
.jp-MarkdownCell .jp-InputArea,
.jp-MarkdownCell .jp-RenderedHTMLCommon {
  background: transparent !important;
}

.jp-MarkdownCell .jp-RenderedHTMLCommon {
  padding-right: 0;
  padding-left: 0;
}

.jp-RenderedHTMLCommon {
  color: var(--eye-ink);
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.65;
}

.jp-RenderedHTMLCommon h1,
.jp-RenderedHTMLCommon h2,
.jp-RenderedHTMLCommon h3 {
  color: var(--eye-ink);
  font-family: inherit;
  letter-spacing: 0;
}

.jp-RenderedHTMLCommon h1 {
  margin: 0 0 1.1rem;
  padding: 0 0 1rem;
  border-bottom: 1px solid var(--eye-line);
  font-size: clamp(2rem, 5vw, 3.35rem);
  line-height: 1.05;
}

.jp-RenderedHTMLCommon h2 {
  margin-top: 2.6rem;
  font-size: 1.65rem;
  line-height: 1.2;
}

.jp-RenderedHTMLCommon h3 {
  margin-top: 2rem;
  font-size: 1.2rem;
}

.jp-RenderedHTMLCommon p,
.jp-RenderedHTMLCommon li {
  color: var(--eye-muted);
}

.jp-RenderedHTMLCommon strong {
  color: var(--eye-ink);
}

.jp-RenderedHTMLCommon .eyebrow {
  margin-bottom: 0.55rem;
  color: var(--eye-secondary);
}

.jp-RenderedHTMLCommon code {
  padding: 0.12rem 0.32rem;
  border-radius: 4px;
  background: var(--eye-soft);
  color: #3730a3;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

.jp-Cell {
  margin-top: 0.65rem;
  margin-bottom: 0.65rem;
}

.jp-CodeCell {
  overflow: hidden;
  border: 1px solid var(--eye-line);
  border-radius: 8px;
  background: var(--eye-panel);
}

.jp-CodeCell .jp-Cell-inputWrapper {
  border-left: 3px solid var(--eye-accent);
}

.jp-InputArea,
.jp-InputArea-editor {
  border: 0;
  border-radius: 0;
  background: #f1f5f9;
}

.jp-InputPrompt,
.jp-OutputPrompt {
  color: var(--eye-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

.jp-OutputArea {
  border-top: 1px solid var(--eye-line);
  background: var(--eye-panel);
}

.jp-OutputArea-output {
  color: var(--eye-ink);
}

.jp-OutputArea-output pre,
.jp-RenderedText pre {
  color: var(--eye-ink);
}

.jp-RenderedHTMLCommon blockquote {
  margin: 1.25rem 0;
  padding: 0.7rem 1rem;
  border-left: 4px solid var(--eye-secondary);
  background: var(--eye-soft);
  color: #3730a3;
}

.site-footer {
  min-height: 5rem;
  margin-top: 3.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--eye-line);
  color: var(--eye-muted);
  font-size: 0.9rem;
}

@media (max-width: 720px) {
  .site-shell,
  body.jp-Notebook > main {
    width: min(100% - 1rem, 1120px);
  }

  .site-header {
    align-items: flex-start;
    padding: 0.8rem 0;
  }

  .site-nav {
    gap: 0.7rem;
  }

  .site-nav a {
    font-size: 0.82rem;
  }

  .notebook-grid {
    grid-template-columns: 1fr;
  }

  .overview {
    padding-top: 2.2rem;
  }
}

@media (max-width: 480px) {
  .site-brand small {
    display: none;
  }

  .site-mark {
    width: 1.75rem;
    height: 1.75rem;
    flex-basis: 1.75rem;
    border-width: 6px;
  }

  .site-nav a:nth-child(2) {
    display: none;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
  }
}