:root {
  color-scheme: light;
  --bg: #f6f5f0;
  --paper: #fffdf8;
  --ink: #1d2523;
  --muted: #66736f;
  --line: #ddd8cb;
  --green: #2f6f5e;
  --blue: #315f8c;
  --amber: #a36a1d;
  --red: #a64f45;
  --lavender: #61568f;
  --shadow: 0 18px 55px rgba(52, 49, 42, 0.12);
  --radius: 8px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(120deg, rgba(47, 111, 94, 0.08), transparent 34rem),
    linear-gradient(280deg, rgba(49, 95, 140, 0.1), transparent 40rem),
    var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.55;
}

a {
  color: inherit;
}

code,
pre {
  font-family: var(--mono);
}

code {
  background: rgba(29, 37, 35, 0.07);
  border: 1px solid rgba(29, 37, 35, 0.08);
  border-radius: 6px;
  padding: 0.08rem 0.28rem;
}

pre {
  overflow-x: auto;
  background: #17211e;
  color: #f4f0e7;
  border-radius: var(--radius);
  padding: 1rem;
  font-size: 0.86rem;
}

pre code {
  background: transparent;
  border: 0;
  padding: 0;
}

.shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: 100vh;
}

.shell > * {
  min-width: 0;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 1.25rem;
  border-right: 1px solid var(--line);
  background: rgba(255, 253, 248, 0.88);
  backdrop-filter: blur(18px);
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
  overflow-y: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  padding: 0.45rem;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.12);
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 1rem;
}

.brand small {
  color: var(--muted);
  font-size: 0.78rem;
}

.nav {
  display: grid;
  gap: 0.2rem;
}

.nav a {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  text-decoration: none;
  color: var(--muted);
  padding: 0.54rem 0.7rem;
  border-radius: var(--radius);
  font-weight: 650;
  font-size: 0.92rem;
}

.nav-section {
  display: grid;
  gap: 0.1rem;
}

.nav-section + .nav-section {
  margin-top: 0.1rem;
}

summary.nav-group,
.nav-group {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin: 0;
  padding: 0.5rem 0.7rem;
  border-radius: var(--radius);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

summary.nav-group {
  cursor: pointer;
  list-style: none;
  user-select: none;
}

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

summary.nav-group::after {
  content: "";
  flex: 0 0 auto;
  width: 0.46rem;
  height: 0.46rem;
  margin-right: 0.15rem;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(-45deg);
  transition: transform 0.18s ease;
  opacity: 0.65;
}

.nav-section[open] > summary.nav-group::after {
  transform: rotate(45deg);
}

summary.nav-group:hover {
  background: #e9e4d6;
  color: var(--ink);
}

.nav-section[open] > summary.nav-group {
  color: var(--ink);
}

.nav-links {
  display: grid;
  gap: 0.1rem;
  padding: 0.15rem 0 0.4rem;
}

.nav-links a {
  padding-left: 1.1rem;
  font-size: 0.9rem;
}

.nav-subsection {
  display: grid;
  gap: 0.1rem;
  min-width: 0;
}

summary.nav-subgroup {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  min-width: 0;
  margin: 0;
  padding: 0.48rem 0.7rem 0.48rem 1.1rem;
  border-radius: var(--radius);
  color: var(--muted);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.25;
  list-style: none;
  user-select: none;
}

summary.nav-subgroup span:last-of-type {
  min-width: 0;
}

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

summary.nav-subgroup::after {
  content: "";
  flex: 0 0 auto;
  width: 0.42rem;
  height: 0.42rem;
  margin-left: auto;
  margin-right: 0.18rem;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(-45deg);
  transition: transform 0.18s ease;
  opacity: 0.65;
}

.nav-subsection[open] > summary.nav-subgroup::after {
  transform: rotate(45deg);
}

summary.nav-subgroup:hover,
.nav-subsection[open] > summary.nav-subgroup {
  background: #e9e4d6;
  color: var(--ink);
}

.nav-sublinks {
  display: grid;
  gap: 0.04rem;
  padding: 0.05rem 0 0.3rem;
}

.nav-sublinks a {
  padding: 0.42rem 0.65rem 0.42rem 2.1rem;
  font-size: 0.8rem;
  font-weight: 650;
  line-height: 1.25;
}

.nav a.active,
.nav a:hover {
  background: #e9e4d6;
  color: var(--ink);
}

.status-icon {
  flex: 0 0 auto;
  width: 0.68rem;
  height: 0.68rem;
  border-radius: 999px;
  border: 2px solid var(--amber);
  background: rgba(163, 106, 29, 0.14);
  box-shadow: inset 0 0 0 3px var(--paper);
}

.status-icon.large {
  width: 1rem;
  height: 1rem;
  margin-top: 0.25rem;
}

.sidebar-card {
  margin-top: auto;
  padding: 1rem;
  background: #ebe5d7;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.sidebar-card p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.content {
  --content-gutter: clamp(1.25rem, 4vw, 4rem);
  min-width: 0;
  width: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding: 0 var(--content-gutter) 4rem;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 3;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 340px);
  align-items: end;
  gap: 1.25rem;
  margin: 0 calc(var(--content-gutter) * -1) 1.3rem;
  padding: 1rem var(--content-gutter);
  border-bottom: 1px solid rgba(221, 216, 203, 0.76);
  background: linear-gradient(to bottom, rgba(246, 245, 240, 0.96), rgba(246, 245, 240, 0.8));
  backdrop-filter: blur(14px);
}

.topbar > div {
  min-width: 0;
}

.topbar h1 {
  margin: 0;
  font-size: clamp(1.35rem, 2vw, 2rem);
  overflow-wrap: anywhere;
}

.eyebrow,
.crumb {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.search {
  display: grid;
  gap: 0.25rem;
  min-width: 0;
  width: 100%;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
}

.search input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.78rem 0.9rem;
  background: var(--paper);
  color: var(--ink);
  outline: none;
  font: inherit;
  box-shadow: 0 8px 28px rgba(52, 49, 42, 0.06);
}

.search input:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(47, 111, 94, 0.15);
}

.page {
  scroll-margin-top: 7rem;
  margin: 1.3rem 0;
  padding: clamp(1.2rem, 3vw, 2.25rem);
  background: rgba(255, 253, 248, 0.9);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.topbar + .page {
  margin-top: 0;
}

.page.hidden-by-search {
  display: none;
}

.plan-section {
  scroll-margin-top: 7rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
}

[data-nav-section] {
  scroll-margin-top: 7rem;
}

#review-findings {
  margin-bottom: 1.25rem;
}

.section-lede {
  max-width: 74ch;
  margin: 0.75rem 0 0;
  color: var(--muted);
}

.plan-heading {
  margin-bottom: 1rem;
}

.plan-title {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 0.65rem;
}

.plan-title h2 {
  margin: 0;
}

.status-pill {
  align-self: center;
  padding: 0.28rem 0.52rem;
  border: 1px solid rgba(163, 106, 29, 0.35);
  border-radius: 999px;
  background: rgba(163, 106, 29, 0.12);
  color: #7d5118;
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 1.2;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(260px, 0.75fr);
  gap: 1.5rem;
  align-items: stretch;
  background:
    linear-gradient(145deg, rgba(47, 111, 94, 0.15), transparent 54%),
    linear-gradient(40deg, rgba(163, 106, 29, 0.12), transparent 50%),
    var(--paper);
}

.hero h2,
.section-heading h2 {
  margin: 0.25rem 0 0;
  font-size: clamp(1.65rem, 3.5vw, 3.8rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.hero p {
  max-width: 68ch;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.4rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0.72rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  text-decoration: none;
  font-weight: 800;
}

.button.primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.hero-panel {
  display: grid;
  gap: 0.75rem;
}

.metric {
  padding: 1rem;
  border-radius: var(--radius);
  border: 1px solid rgba(29, 37, 35, 0.12);
  background: rgba(255, 255, 255, 0.62);
}

.metric span {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
}

.metric strong {
  display: block;
  margin-top: 0.25rem;
  font-size: 1.05rem;
}

.section-heading {
  margin-bottom: 1.2rem;
}

.section-heading h2 {
  font-size: clamp(1.5rem, 2.6vw, 2.65rem);
}

.grid {
  display: grid;
  gap: 1rem;
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card,
.note,
.sequence,
.risk,
.study-path article {
  border: 1px solid var(--line);
  background: #fffaf0;
  border-radius: var(--radius);
  padding: 1rem;
}

.card {
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--lavender);
}

.card h3,
.note strong,
.risk h3,
.sequence h3,
.study-path h3 {
  margin: 0 0 0.55rem;
}

.card p,
.note p,
.risk li,
.sequence li,
.study-path p {
  color: var(--muted);
}

.card ul,
.risk ul {
  padding-left: 1.25rem;
}

.accent-green::before {
  background: var(--green);
}

.accent-blue::before {
  background: var(--blue);
}

.accent-amber::before {
  background: var(--amber);
}

.accent-red::before {
  background: var(--red);
}

.source {
  display: inline-flex;
  align-items: center;
  margin: 0.25rem 0.35rem 0.1rem 0;
  padding: 0.25rem 0.45rem;
  border: 1px solid rgba(29, 37, 35, 0.14);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.72);
  color: #335c88;
  font-family: var(--mono);
  font-size: 0.78rem;
  text-decoration: none;
}

.source:hover {
  border-color: #335c88;
}

.architecture-map {
  display: grid;
  gap: 0.8rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f5f0e3;
}

.layer {
  padding: 1rem;
  border-radius: var(--radius);
  border: 1px solid rgba(29, 37, 35, 0.14);
  background: var(--paper);
}

.layer h3,
.layer p {
  margin: 0;
}

.layer p {
  color: var(--muted);
}

.layer code {
  display: inline-block;
  margin-top: 0.5rem;
}

.mobile {
  border-left: 6px solid var(--blue);
}

.backend {
  border-left: 6px solid var(--green);
}

.store {
  border-left: 6px solid var(--amber);
}

.log {
  border-left: 6px solid var(--lavender);
}

.swarm {
  border-left: 6px solid var(--red);
}

.pairing {
  border-left: 6px solid #527c87;
}

.connector {
  justify-self: center;
  padding: 0.35rem 0.75rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.85rem;
}

.branch-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.8rem;
}

.note-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: var(--radius);
}

.info-table th,
.info-table td {
  text-align: left;
  vertical-align: top;
  padding: 0.85rem;
  border-bottom: 1px solid var(--line);
}

.info-table th {
  background: #ece5d5;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.info-table td {
  background: rgba(255, 250, 240, 0.62);
  color: var(--muted);
}

.info-table td:first-child {
  color: var(--ink);
  font-weight: 700;
}

.callout {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: var(--radius);
  border: 1px solid rgba(163, 106, 29, 0.34);
  background: rgba(163, 106, 29, 0.09);
}

.flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.flow > div {
  position: relative;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fffaf0;
}

.flow span,
.study-path span {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-weight: 800;
  font-size: 0.8rem;
}

.flow h3 {
  margin: 0.75rem 0 0.4rem;
}

.flow p {
  color: var(--muted);
}

.sequence {
  margin-top: 1rem;
}

.sequence ol {
  padding-left: 1.2rem;
}

.risk-board {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.risk.good {
  border-top: 5px solid var(--green);
}

.risk.warn {
  border-top: 5px solid var(--amber);
}

.risk.fix {
  border-top: 5px solid var(--blue);
}

.library-grid,
.file-index {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.library-grid div,
.file-index a {
  display: grid;
  gap: 0.3rem;
  min-height: 104px;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fffaf0;
  text-decoration: none;
}

.library-grid span,
.file-index span {
  color: var(--muted);
  font-size: 0.92rem;
}

.file-index a:hover {
  border-color: var(--blue);
  transform: translateY(-1px);
}

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

#multi-app-plan > .grid,
#multi-app-plan > .info-table,
#multi-app-plan > .source {
  margin-top: 1rem;
}

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

.primitive-card {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fffaf0;
  padding: 1rem;
}

.primitive-card h3 {
  margin: 0.15rem 0 0.55rem;
  font-size: 1.45rem;
}

.primitive-card h4 {
  margin: 1rem 0 0.35rem;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.primitive-card p,
.primitive-card li,
.primitive-flow li,
.detail-list p {
  color: var(--muted);
  overflow-wrap: anywhere;
}

.primitive-card ul {
  padding-left: 1.2rem;
}

.primitive-card .source {
  display: inline-block;
  max-width: 100%;
  overflow-wrap: anywhere;
}

.primitive-label {
  display: inline-flex;
  padding: 0.18rem 0.45rem;
  border-radius: 999px;
  background: rgba(29, 37, 35, 0.08);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.primitive-flow,
.detail-list {
  min-width: 0;
  margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f5f0e3;
  padding: 1rem;
}

.primitive-flow h3,
.detail-list h3 {
  margin: 0 0 0.75rem;
}

.primitive-flow ol {
  margin: 0;
  padding-left: 1.25rem;
}

.primitive-flow li {
  color: var(--muted);
  margin: 0.45rem 0;
}

.detail-list {
  display: grid;
  gap: 0.75rem;
}

.detail-list div {
  padding: 0.9rem;
  border-radius: var(--radius);
  background: rgba(255, 253, 248, 0.78);
  border: 1px solid rgba(29, 37, 35, 0.08);
}

.detail-list strong {
  display: block;
  margin-bottom: 0.25rem;
}

.detail-list p {
  margin: 0;
  color: var(--muted);
}

@media (max-width: 1100px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: relative;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

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

  .sidebar-card {
    display: none;
  }

  .grid.three,
  .branch-grid,
  .flow,
  .risk-board,
  .library-grid,
  .file-index,
  .primitive-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .content {
    --content-gutter: 0.8rem;
    padding: 0 var(--content-gutter) 3rem;
  }

  .sidebar {
    gap: 0.7rem;
    padding: 0.75rem 0.8rem;
    overflow: hidden;
  }

  .brand img {
    width: 34px;
    height: 34px;
  }

  .nav {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.15rem;
    width: 100%;
    min-width: 0;
  }

  .nav a {
    white-space: normal;
  }

  .topbar {
    position: static;
    grid-template-columns: 1fr;
    gap: 0.75rem;
    padding-block: 0.85rem;
  }

  .hero {
    display: block;
  }

  .search {
    min-width: 0;
  }

  .grid.two,
  .grid.three,
  .note-grid,
  .branch-grid,
  .flow,
  .risk-board,
  .library-grid,
  .file-index,
  .study-path,
  .primitive-grid {
    grid-template-columns: 1fr;
  }

  .hero-panel {
    margin-top: 1rem;
  }

  .page {
    scroll-margin-top: 1rem;
    padding: 1rem;
  }

  [data-nav-section] {
    scroll-margin-top: 1rem;
  }

  .info-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}