@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,400;0,9..144,600;0,9..144,700;1,9..144,500&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  --bg: #f5f4f1;
  --surface: #ffffff;
  --surface-2: #edece7;
  --ink: #1b1f20;
  --ink-muted: #5c6265;
  --ink-faint: #8c9194;
  --border: #ddd9d1;
  --accent: #0d7a7a;
  --accent-ink: #ffffff;
  --accent-soft: #e2efee;
  --serif: 'Fraunces', Georgia, 'Times New Roman', serif;
  --sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14181a;
    --surface: #1a1f21;
    --surface-2: #20262a;
    --ink: #ecede9;
    --ink-muted: #a2a9ab;
    --ink-faint: #6e7476;
    --border: #2b3234;
    --accent: #4fd1c5;
    --accent-ink: #0c1516;
    --accent-soft: rgba(79, 209, 197, 0.12);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #14181a;
  --surface: #1a1f21;
  --surface-2: #20262a;
  --ink: #ecede9;
  --ink-muted: #a2a9ab;
  --ink-faint: #6e7476;
  --border: #2b3234;
  --accent: #4fd1c5;
  --accent-ink: #0c1516;
  --accent-soft: rgba(79, 209, 197, 0.12);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
}

img { max-width: 100%; }
[hidden] { display: none !important; }
a { color: inherit; }

.shell {
  display: flex;
  align-items: flex-start;
  max-width: 1180px;
  margin: 0 auto;
  padding-inline: clamp(16px, 4vw, 40px);
  gap: clamp(24px, 4vw, 56px);
}

/* ---------- Sidebar ---------- */

.sidebar {
  position: sticky;
  top: calc(env(safe-area-inset-top, 0px) + 32px);
  flex: 0 0 220px;
  padding-block: 40px 24px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.brand a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-decoration: none;
}

.brand-eyebrow {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.brand-name {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
}

nav.menu {
  position: relative;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--border);
}

.nav-indicator {
  position: absolute;
  left: -1px;
  width: 2px;
  background: var(--accent);
  border-radius: 2px;
  transition: transform 0.35s cubic-bezier(0.65, 0, 0.35, 1), height 0.35s cubic-bezier(0.65, 0, 0.35, 1);
  transform: translateY(0);
}

.menu a {
  text-decoration: none;
  font-size: 0.92rem;
  color: var(--ink-muted);
  padding: 9px 0 9px 18px;
  transition: color 0.2s ease;
}

.menu a:hover { color: var(--ink); }

.menu a.active {
  color: var(--ink);
  font-weight: 500;
}

.sidebar-foot {
  margin-top: auto;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

/* ---------- Main ---------- */

main {
  flex: 1 1 auto;
  min-width: 0;
  padding-block: 40px 96px;
}

.page {
  display: flex;
  flex-direction: column;
  max-width: 820px;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
  display: block;
}

h1, h2 { text-wrap: balance; font-family: var(--serif); margin: 0; }

/* Título page */

.title-headline {
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  font-weight: 600;
  line-height: 1.22;
}

.title-headline .divider { color: var(--accent); }

.parts-grid {
  margin-top: 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.part-card {
  background: var(--surface);
  padding: 24px 26px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.part-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

.part-name {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
}

.part-desc {
  font-size: 0.92rem;
  color: var(--ink-muted);
  margin: 0;
}

.theory {
  margin-top: 64px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.theory .block {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.theory h2 {
  font-size: 1.4rem;
  font-weight: 600;
}

.theory h3 {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0;
}

.theory p {
  margin: 0;
  font-size: 0.96rem;
  color: var(--ink-muted);
}

.theory p.lead {
  font-size: 1.05rem;
  color: var(--ink);
}

.theory ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.theory li {
  position: relative;
  padding-left: 20px;
  font-size: 0.94rem;
  color: var(--ink-muted);
}

.theory li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent);
}

.theory li strong {
  font-weight: 600;
  color: var(--ink);
}

/* Prose (flowing text) pages */

.prose {
  display: flex;
  flex-direction: column;
  gap: 22px;
  max-width: 640px;
  margin-top: 28px;
}

.prose p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink);
}

.citation {
  color: #1a56db;
  cursor: help;
  border-bottom: 1px dotted #1a56db;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .citation { color: #7aa8ff; border-bottom-color: #7aa8ff; }
}

:root[data-theme="dark"] .citation { color: #7aa8ff; border-bottom-color: #7aa8ff; }

/* Citation tooltip */

.citation-tooltip {
  position: fixed;
  z-index: 60;
  width: 320px;
  max-width: calc(100vw - 32px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.22);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.15s ease, transform 0.15s ease;
  pointer-events: none;
}

.citation-tooltip.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.citation-tooltip-item + .citation-tooltip-item {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.citation-quote {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--ink);
}

.citation-quote-label {
  display: block;
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}

.citation-ref-title {
  margin: 0;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 0.84rem;
  line-height: 1.35;
}

.citation-ref-meta {
  margin-top: 3px;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-muted);
  line-height: 1.4;
}

.todo-flag {
  font-family: var(--mono);
  font-size: 0.82em;
  color: var(--ink);
  background: var(--accent-soft);
  border: 1px dashed var(--accent);
  padding: 1px 7px;
  border-radius: 4px;
}

/* Pesquisa page */

.rq-wrap { position: relative; margin-top: 8px; }

.rq-mark {
  font-family: var(--serif);
  font-size: 3.5rem;
  color: var(--accent-soft);
  line-height: 1;
  position: absolute;
  top: -1.6rem;
  left: -0.15em;
  z-index: 0;
  user-select: none;
}

.rq-text {
  position: relative;
  z-index: 1;
  font-family: var(--serif);
  font-style: italic;
  font-weight: 500;
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.4;
  margin: 0;
}

.observe-grid {
  margin-top: 44px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.observe-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 22px;
  background: var(--surface);
}

.observe-card.yes { border-left: 3px solid var(--accent); }
.observe-card.no { border-left: 3px solid var(--ink-faint); opacity: 0.85; }

.observe-title {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.observe-card.yes .observe-title { color: var(--accent); }
.observe-card.no .observe-title { color: var(--ink-faint); }

.observe-body { font-size: 0.9rem; color: var(--ink-muted); }

/* Hipóteses page */

.hyp-intro {
  color: var(--ink-muted);
  font-size: 0.96rem;
  margin: 8px 0 0;
  max-width: 640px;
}

.hyp-note {
  margin-top: 24px;
}

.hyp-main {
  margin-top: 28px;
  background: var(--surface-2);
  border-radius: 10px;
  padding: 22px 24px;
  display: flex;
  gap: 16px;
  align-items: baseline;
}

.hyp-code {
  font-family: var(--mono);
  font-weight: 500;
  color: var(--accent);
  flex: 0 0 auto;
}

.hyp-text { font-size: 0.98rem; }

.hyp-list {
  margin-top: 18px;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--border);
}

.hyp-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px 0 16px 22px;
  border-bottom: 1px solid var(--border);
}

.hyp-item:last-child { border-bottom: none; }

.hyp-item .hyp-code { font-size: 0.85rem; min-width: 34px; }

.hyp-item-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.hyp-statement { font-size: 0.94rem; }

.hyp-var {
  align-self: flex-start;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 3px 10px;
}

/* Base de dados page */

.source-card {
  margin-top: 8px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  padding: 20px 22px;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.source-title {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.source-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink-muted);
}

.source-link {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--ink);
  word-break: break-all;
  text-decoration: underline;
  text-decoration-color: var(--border);
  text-underline-offset: 3px;
}

.source-link:hover { text-decoration-color: var(--accent); }

.section-block {
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.section-block h2 {
  font-size: 1.3rem;
  font-weight: 600;
}

.section-block .lede {
  margin: 0;
  font-size: 0.94rem;
  color: var(--ink-muted);
  max-width: 640px;
}

.section-block .lede strong {
  color: var(--ink);
  font-weight: 600;
}

.section-block .prose {
  margin-top: 0;
}

.section-block .prose + .lede {
  margin-top: 20px;
}

.lede code {
  font-family: var(--mono);
  font-size: 0.85em;
  color: var(--ink);
  background: var(--accent-soft);
  padding: 2px 6px;
  border-radius: 4px;
}

/* Pipeline diagram */

.pipeline {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.pipeline li {
  display: flex;
  gap: 20px;
  position: relative;
  padding-bottom: 28px;
}

.pipeline li:last-child { padding-bottom: 0; }

.pipeline li:not(:last-child)::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 32px;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.pipeline-node {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--accent);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.82rem;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
}

.pipeline-body h3 {
  margin: 0 0 4px;
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 600;
}

.pipeline-body p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--ink-muted);
}

/* Camadas (layers) diagram */

.layers {
  margin-top: 32px;
  display: flex;
  align-items: stretch;
  gap: 14px;
}

.layer-card {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 20px;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.layer-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-faint);
  font-size: 1.2rem;
  flex: 0 0 auto;
}

.field-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.field-list li {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-muted);
  padding-left: 14px;
  position: relative;
}

.field-list li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* Schema block */

.schema-block {
  margin-top: 32px;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  max-width: 480px;
}

.schema-title {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-muted);
  background: var(--surface-2);
  padding: 10px 18px;
  border-bottom: 1px solid var(--border);
}

.schema-fields {
  list-style: none;
  margin: 0;
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--surface);
}

.schema-fields li {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--ink);
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.schema-fields li::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex: 0 0 auto;
}

/* IA intensity scale */

.scale {
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}

.scale-item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 16px 18px;
  background: var(--surface);
}

.scale-level {
  display: flex;
  align-items: center;
  gap: 10px;
}

.scale-num {
  font-family: var(--mono);
  font-weight: 500;
  color: var(--accent);
  font-size: 0.95rem;
}

.scale-bar {
  flex: 1;
  height: 6px;
  border-radius: 999px;
  background: var(--surface-2);
  overflow: hidden;
}

.scale-fill {
  display: block;
  height: 100%;
  width: var(--fill, 0%);
  background: var(--accent);
  border-radius: 999px;
}

.scale-label {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 0.98rem;
}

.scale-desc {
  margin: 0;
  font-size: 0.85rem;
  color: var(--ink-muted);
}

.scale-example {
  margin: 0;
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.85rem;
  color: var(--ink);
  padding-top: 6px;
  border-top: 1px solid var(--border);
}

/* Método page: quadro (table) */

.quadro {
  margin-top: 28px;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.quadro-title {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
  background: var(--surface-2);
  padding: 10px 18px;
  border-bottom: 1px solid var(--border);
}

.quadro-scroll {
  overflow-x: auto;
}

table.quadro-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  background: var(--surface);
  font-size: 0.86rem;
}

table.quadro-table th,
table.quadro-table td {
  text-align: left;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  line-height: 1.5;
}

table.quadro-table th {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-weight: 500;
  background: var(--surface-2);
}

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

table.quadro-table td.mono {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--ink);
  white-space: nowrap;
}

table.quadro-table td strong { font-weight: 600; }

/* Capa (index page) */

.cover {
  margin: clamp(48px, 12vh, 140px) auto 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 56px;
  max-width: 620px;
  text-align: center;
}

.cover-org {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.cover-org-name {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink);
}

.cover-org-sub {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-muted);
}

.cover-program {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-top: 10px;
}

.cover-author {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 600;
}

.cover-title {
  font-family: var(--serif);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 600;
  line-height: 1.35;
  text-wrap: balance;
}

/* Referências page */

.reflist {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 680px;
}

.ref-entry {
  margin: 0;
  padding-left: 28px;
  text-indent: -28px;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--ink);
}

.ref-entry a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: var(--border);
  word-break: break-all;
}

.ref-entry a:hover { text-decoration-color: var(--accent); }


/* ---------- Mobile ---------- */

@media (max-width: 760px) {
  .shell {
    flex-direction: column;
    padding-inline: 18px;
  }

  .sidebar {
    position: sticky;
    top: env(safe-area-inset-top, 0px);
    width: 100%;
    flex: none;
    padding-block: 18px 10px;
    background: var(--bg);
    z-index: 5;
    border-bottom: 1px solid var(--border);
    gap: 0;
  }

  .brand { display: none; }

  nav.menu {
    flex-direction: row;
    border-left: none;
    border-bottom: none;
    overflow-x: auto;
    gap: 4px;
  }

  .nav-indicator {
    left: 0;
    bottom: 0;
    top: auto;
    width: 0;
    height: 2px;
  }

  .menu a { padding: 8px 14px; white-space: nowrap; }

  .sidebar-foot { display: none; }

  main { padding-block: 28px 64px; }

  .parts-grid, .observe-grid { grid-template-columns: 1fr; }

  .rq-mark { font-size: 2.6rem; top: -1.2rem; }

  .layers { flex-direction: column; }

  .layer-arrow { transform: rotate(90deg); padding: 4px 0; }

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