@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap");

/* ── WALL-E warm light theme ─────────────────── */
:root {
  --bg: #FAFAF7;
  --surface: #FFFFFF;
  --surface-alt: #F5F3EE;
  --border: #E7E5E0;
  --border-strong: #D4D1CA;
  --primary: #A16207;
  --primary-hover: #854D0E;
  --primary-bg: rgba(161, 98, 7, 0.07);
  --primary-border: rgba(161, 98, 7, 0.2);
  --rust: #9A3412;
  --rust-bg: rgba(154, 52, 18, 0.06);
  --rust-border: rgba(154, 52, 18, 0.2);
  --text: #1C1917;
  --text-secondary: #57534E;
  --text-dim: #A8A29E;
  --mono: "JetBrains Mono", "SF Mono", monospace;
  --sans: "Inter", -apple-system, "Segoe UI", sans-serif;
  --page: 960px;
  --gap: 20px;
  --radius: 8px;
}

/* ── Reset ────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); text-decoration: underline; }
img, video { display: block; max-width: 100%; }
ul { list-style: none; }
strong { font-weight: 600; }

/* ── Page ─────────────────────────────────────── */
.page {
  width: min(calc(100% - 40px), var(--page));
  margin: 0 auto;
}

/* ── Header ───────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 250, 247, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
  width: min(calc(100% - 40px), var(--page));
  margin: 0 auto;
}

.site-brand {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text);
  letter-spacing: -0.02em;
}

.site-brand:hover { text-decoration: none; color: var(--text); }

.header-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.header-nav a {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
}

.header-nav a:hover {
  color: var(--text);
  text-decoration: none;
}

.gh-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  transition: border-color 0.15s;
}

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

.gh-link svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

/* ── Hero ─────────────────────────────────────── */
.hero {
  padding: 48px 0 40px;
  border-bottom: 1px solid var(--border);
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 48px;
  align-items: start;
}

.hero h1 {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--text);
}

.hero-desc {
  margin-top: 12px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 52ch;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.hero-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  font-size: 0.82rem;
  font-weight: 500;
  border-radius: 6px;
  transition: background 0.15s;
}

.hero-links .link-primary {
  color: #fff;
  background: var(--primary);
}

.hero-links .link-primary:hover {
  background: var(--primary-hover);
  text-decoration: none;
}

.hero-links .link-secondary {
  color: var(--text-secondary);
  background: var(--surface);
  border: 1px solid var(--border);
}

.hero-links .link-secondary:hover {
  border-color: var(--border-strong);
  color: var(--text);
  text-decoration: none;
}

.hero-media img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.callout {
  margin-top: 20px;
  padding: 12px 16px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  border-left: 3px solid var(--rust);
  background: var(--rust-bg);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.callout strong { color: var(--text); }

.info-callout {
  margin-top: 28px;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.info-callout-label {
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--primary);
}

.info-callout-copy {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.info-callout-copy h2 {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.info-callout-copy p {
  margin-top: 6px;
  max-width: 58ch;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.info-callout-action {
  flex-shrink: 0;
}

/* ── Section ──────────────────────────────────── */
.section {
  padding: 48px 0;
  border-bottom: 1px solid var(--border);
}

.section:last-of-type {
  border-bottom: none;
}

.section-head {
  margin-bottom: 28px;
}

.section-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 8px;
}

.section-title {
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.section-desc {
  margin-top: 8px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  max-width: 60ch;
}

.section-linkline {
  margin: -8px 0 18px;
  font-size: 0.88rem;
}

/* ── Capabilities ─────────────────────────────── */
.cap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--gap);
}

.cap-item {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.cap-item h3 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.cap-item p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── Nodes ────────────────────────────────────── */
.node-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

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

.node-table th {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  background: var(--surface-alt);
}

.node-table td:first-child {
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--primary);
  white-space: nowrap;
}

.node-table td:nth-child(2) {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  white-space: nowrap;
}

.node-table td:last-child {
  color: var(--text-secondary);
}

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

.table-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
}

/* ── Hardware BOM ─────────────────────────────── */
.bom-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--gap);
}

.bom-card {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.bom-card h3 {
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.bom-card ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.bom-card li {
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.5;
  padding-left: 14px;
  position: relative;
}

.bom-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--border-strong);
}

.bom-card li strong {
  color: var(--text);
  font-weight: 500;
}

.bom-notes {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--gap);
  margin-top: var(--gap);
}

.bom-note {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-alt);
}

.bom-note h4 {
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.bom-note p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── Quick Start ──────────────────────────────── */
.prereq-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.prereq-list span {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-secondary);
}

.cmd-block {
  margin-top: 16px;
  padding: 14px 18px;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.8;
  background: #292524;
  color: #E7E5E4;
  border-radius: var(--radius);
  overflow-x: auto;
}

.cmd-block .comment {
  color: #78716C;
}

.cmd-block .prompt {
  color: #A8A29E;
  user-select: none;
}

/* ── Video ────────────────────────────────────── */
.hero-video {
  margin-top: 32px;
}

.video-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: #000;
}

.video-wrap video {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: contain;
}

/* ── Links Grid ───────────────────────────────── */
.link-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}

.link-card {
  display: block;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: inherit;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.link-card:hover {
  border-color: var(--border-strong);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  text-decoration: none;
  color: inherit;
}

.link-card-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 8px;
}

.link-card h3 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text);
}

.link-card p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ── Community ────────────────────────────────── */
.community-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--gap);
}

/* ── Credits ──────────────────────────────────── */
.credits-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
}

.credit-card {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.credit-card h3 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.credit-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.credit-card p + p { margin-top: 8px; }

.credit-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 10px;
  font-size: 0.82rem;
}

.thanks-note {
  margin-top: var(--gap);
  padding: 16px 20px;
  border-left: 3px solid var(--primary);
  background: var(--primary-bg);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* ── Node Docs Subpage ────────────────────────── */
.docs-page {
  padding-top: 18px;
}

.docs-hero {
  padding-top: 40px;
}

.docs-title {
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.docs-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.docs-sidebar {
  position: sticky;
  top: 76px;
}

.docs-sidebar-box {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.docs-sidebar-label {
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.docs-sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.docs-sidebar-nav a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

.docs-sidebar-nav a:hover {
  color: var(--text);
  text-decoration: none;
}

.docs-sidebar-note {
  margin-top: 16px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.docs-content {
  display: grid;
  gap: 18px;
}

.docs-card {
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.docs-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.docs-card-head h2 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.docs-card-kicker {
  margin-bottom: 6px;
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--primary);
}

.docs-card-head > a {
  flex-shrink: 0;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.76rem;
  color: var(--text-secondary);
}

.docs-card-head > a:hover {
  color: var(--text);
  text-decoration: none;
  border-color: var(--border-strong);
}

.docs-card-text {
  margin-top: 12px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.docs-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.docs-meta-row span {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-alt);
  font-size: 0.74rem;
  color: var(--text-secondary);
}

.docs-meta-row code {
  font-family: var(--mono);
  font-size: 0.74rem;
}

.docs-two-col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.docs-two-col section {
  margin: 0;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-alt);
}

.docs-two-col h3 {
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.docs-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.docs-list li {
  position: relative;
  padding-left: 14px;
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.docs-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--border-strong);
}

/* ── Footer ───────────────────────────────────── */
.site-footer {
  padding: 24px 0;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-text {
  font-size: 0.78rem;
  color: var(--text-dim);
}

.footer-links {
  display: flex;
  gap: 16px;
}

.footer-links a {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

/* ── Responsive ───────────────────────────────── */
@media (max-width: 768px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .info-callout-copy,
  .docs-layout,
  .docs-two-col {
    grid-template-columns: 1fr;
  }

  .info-callout-copy {
    display: grid;
  }

  .cap-grid,
  .bom-grid,
  .bom-notes,
  .link-grid,
  .community-grid,
  .credits-grid {
    grid-template-columns: 1fr;
  }

  .header-nav a:not(.gh-link) {
    display: none;
  }

  .section { padding: 36px 0; }
  .hero { padding: 32px 0; }

  .hero h1 { font-size: 1.5rem; }

  .table-wrap { overflow-x: auto; }
  .node-table { min-width: 560px; }

  .docs-sidebar {
    position: static;
  }
}

@media (max-width: 480px) {
  .page {
    width: min(calc(100% - 24px), var(--page));
  }

  .header-inner {
    width: min(calc(100% - 24px), var(--page));
  }

  .hero-links {
    flex-direction: column;
  }

  .hero-links a {
    text-align: center;
    justify-content: center;
  }
}