/* ============================================================
   Valor documentation site
   GitHub-light editorial palette. System fonts. Hairline rules.
   ============================================================ */

:root {
  --ink: #1f2328;
  --muted: #59636e;
  --faint: #818b98;
  --accent: #0969da;
  --accent-deep: #0550ae;
  --border: #d0d7de;
  --hairline: #e4e8ec;
  --surface: #f6f8fa;
  --surface-deep: #eef1f4;
  --code-bg: #f6f8fa;
  --code-ink: #953800;
  --good: #1a7f37;
  --warn: #9a6700;
  --danger: #cf222e;
  --mono: "SF Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --measure: 44rem;
  --page: 71rem;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.65;
  color: var(--ink);
  background: #ffffff;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code, pre {
  font-family: var(--mono);
}
code {
  font-size: 0.86em;
  background: var(--code-bg);
  border: 1px solid var(--hairline);
  border-radius: 4px;
  padding: 1px 5px;
  color: var(--code-ink);
}
pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 18px 22px;
  font-size: 0.82rem;
  line-height: 1.6;
  overflow-x: auto;
}
pre code { background: none; border: none; padding: 0; color: var(--ink); }

/* ---------- top navigation ---------- */

.topnav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.topnav-inner {
  max-width: var(--page);
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: baseline;
  gap: 26px;
  min-height: 54px;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 13px 0;
  color: var(--ink);
}
.brand:hover { text-decoration: none; }
.brand .name {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.brand .sub {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--faint);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.topnav nav {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  margin-left: auto;
}
.topnav nav a {
  color: var(--muted);
  font-size: 0.88rem;
  padding: 15px 10px 12px;
  border-bottom: 2px solid transparent;
}
.topnav nav a:hover { color: var(--ink); text-decoration: none; }
.topnav nav a[aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
  border-bottom-color: var(--accent);
}

/* ---------- page scaffolding ---------- */

main {
  max-width: var(--page);
  margin: 0 auto;
  padding: 0 28px 90px;
}

.kicker {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 58px 0 10px;
}
.kicker .n { color: var(--faint); }

h1 {
  font-size: 2.35rem;
  line-height: 1.15;
  letter-spacing: -0.022em;
  font-weight: 700;
  margin: 0 0 14px;
}
.lede {
  font-size: 1.16rem;
  line-height: 1.6;
  color: var(--muted);
  max-width: var(--measure);
  margin: 0 0 8px;
}

section { margin-top: 64px; }
section > h2 {
  font-size: 1.42rem;
  letter-spacing: -0.015em;
  font-weight: 700;
  margin: 0 0 6px;
  padding-top: 30px;
  border-top: 1px solid var(--border);
}
.sec-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 6px;
}
h3 {
  font-size: 1.05rem;
  font-weight: 650;
  margin: 30px 0 6px;
}
p { max-width: var(--measure); margin: 0 0 16px; }
ul, ol { max-width: var(--measure); padding-left: 1.35em; margin: 0 0 16px; }
li { margin-bottom: 6px; }
li::marker { color: var(--faint); }

.wide { max-width: none; }

/* ---------- hero ---------- */

.hero { padding-top: 26px; }
.hero .kicker { margin-top: 46px; }
.hero h1 { font-size: 2.9rem; max-width: 22ch; }
.hero .lede { font-size: 1.22rem; }
.hero-meta {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--faint);
  margin: 22px 0 0;
}
.hero-meta b { color: var(--ink); font-weight: 600; }
.hero-meta .sep { margin: 0 8px; color: var(--border); }

.logo-row {
  display: flex;
  align-items: center;
  gap: 30px;
  flex-wrap: wrap;
  margin: 34px 0 0;
  padding: 18px 0;
  border-top: 1px solid var(--hairline);
}
.logo-row img { height: 24px; width: auto; opacity: 0.62; }
.logo-row .cap {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--faint);
  margin-right: 6px;
}

/* ---------- stats ---------- */

.stat-band {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  margin: 26px 0;
}
.stat-band .cell {
  padding: 20px 22px 16px;
  border-left: 1px solid var(--hairline);
  background: #fff;
}
.stat-band .cell:first-child { border-left: none; }
.stat-band .num {
  font-size: 2.15rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--accent-deep);
  font-variant-numeric: tabular-nums;
}
.stat-band .cap {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 3px;
  line-height: 1.45;
}

/* ---------- distribution bars ---------- */

.dist { margin: 20px 0 6px; }
.dist-row {
  display: grid;
  grid-template-columns: 12rem 1fr 4.5rem;
  gap: 14px;
  align-items: center;
  padding: 7px 0;
  border-bottom: 1px solid var(--hairline);
  font-size: 0.88rem;
}
.dist-row:last-child { border-bottom: none; }
.dist-row .lbl { color: var(--ink); }
.dist-row .lbl a { color: inherit; }
.dist-row .bar-track { display: block; height: 8px; border-radius: 4px; background: var(--surface-deep); overflow: hidden; }
.dist-row .bar { display: block; height: 100%; border-radius: 4px; background: var(--accent); opacity: 0.85; }
.dist-row .val {
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--muted);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ---------- two/three-column prose ---------- */

.cols-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  max-width: none;
}
.cols-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 32px;
  max-width: none;
}
.cols-2 h3:first-child, .cols-3 h3:first-child { margin-top: 0; }

/* ---------- definition rows ---------- */

.def-list { border-top: 1px solid var(--border); margin: 22px 0; max-width: none; }
.def-row {
  display: grid;
  grid-template-columns: 13rem 1fr;
  gap: 26px;
  padding: 16px 0;
  border-bottom: 1px solid var(--hairline);
}
.def-row dt {
  font-weight: 650;
  font-size: 0.95rem;
}
.def-row dt .hint {
  display: block;
  font-family: var(--mono);
  font-weight: 400;
  font-size: 0.7rem;
  color: var(--faint);
  margin-top: 3px;
}
.def-row dd { margin: 0; color: var(--muted); font-size: 0.95rem; max-width: 44rem; }
.def-row dd code { font-size: 0.8em; }

/* ---------- tables ---------- */

.table-wrap { overflow-x: auto; margin: 22px 0; }
table.doc {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.9rem;
}
table.doc th {
  text-align: left;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--muted);
  padding: 8px 14px 8px 0;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
table.doc td {
  padding: 10px 14px 10px 0;
  border-bottom: 1px solid var(--hairline);
  vertical-align: top;
}
table.doc td.mono { font-family: var(--mono); font-size: 0.78rem; white-space: nowrap; }
table.doc td .dim { color: var(--muted); }

/* ---------- file chips (data-driven) ---------- */

.file-chips { margin: 14px 0 22px; max-width: none; }
.file-chip {
  display: grid;
  grid-template-columns: 17rem 1fr;
  gap: 20px;
  padding: 10px 0;
  border-bottom: 1px solid var(--hairline);
  font-size: 0.88rem;
}
.file-chip:first-child { border-top: 1px solid var(--border); }
.file-chip .path {
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--accent-deep);
  word-break: break-all;
}
.file-chip .desc { color: var(--muted); max-width: 46rem; }

/* ---------- concept asides ---------- */

.concept {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px 20px 14px;
  margin: 22px 0;
  max-width: 46rem;
  background: var(--surface);
}
.concept .tag {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--accent-deep);
  margin-bottom: 6px;
}
.concept p { margin: 0; font-size: 0.92rem; color: var(--ink); }

/* ---------- pull quote ---------- */

.pull {
  font-size: 1.28rem;
  line-height: 1.45;
  letter-spacing: -0.01em;
  font-weight: 600;
  color: var(--accent-deep);
  max-width: 34rem;
  margin: 34px 0;
  padding-top: 22px;
  border-top: 2px solid var(--ink);
}

/* ---------- flow diagram (runtime) ---------- */

.diagram-wrap { overflow-x: auto; margin: 26px 0; padding-bottom: 6px; }
.diagram-wrap svg { display: block; min-width: 640px; width: 100%; height: auto; }
.diagram-cap {
  font-size: 0.82rem;
  color: var(--faint);
  font-family: var(--mono);
  margin: 4px 0 0;
  max-width: none;
}

/* ---------- page footer nav ---------- */

.page-next {
  margin-top: 80px;
  border-top: 1px solid var(--border);
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.page-next a {
  font-size: 0.92rem;
  font-weight: 600;
}
.page-next .lbl {
  display: block;
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  font-weight: 400;
  margin-bottom: 3px;
}

footer.site {
  border-top: 1px solid var(--border);
  margin-top: 0;
}
footer.site a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 2px;
}
footer.site .inner {
  max-width: var(--page);
  margin: 0 auto;
  padding: 26px 28px 40px;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--faint);
  display: flex;
  gap: 8px 26px;
  flex-wrap: wrap;
}

/* ---------- index: section directory ---------- */

.dir { border-top: 1px solid var(--border); margin-top: 24px; max-width: none; }
.dir a.dir-row {
  display: grid;
  grid-template-columns: 3rem 15rem 1fr auto;
  gap: 22px;
  align-items: baseline;
  padding: 17px 4px;
  border-bottom: 1px solid var(--hairline);
  color: var(--ink);
}
.dir a.dir-row:hover { background: var(--surface); text-decoration: none; }
.dir .idx { font-family: var(--mono); font-size: 0.74rem; color: var(--faint); }
.dir .ttl { font-weight: 650; font-size: 0.98rem; }
.dir .dsc { color: var(--muted); font-size: 0.88rem; }
.dir .go { font-family: var(--mono); color: var(--accent); font-size: 0.8rem; }

/* ---------- layers explorer ---------- */

.explorer {
  display: grid;
  grid-template-columns: 21rem 1fr;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  margin-top: 30px;
}
.layer-list {
  border-right: 1px solid var(--border);
  background: var(--surface);
  max-height: 76vh;
  overflow-y: auto;
}
.layer-item {
  display: block;
  width: 100%;
  text-align: left;
  border: none;
  background: none;
  font: inherit;
  cursor: pointer;
  padding: 13px 18px 12px;
  border-bottom: 1px solid var(--hairline);
  color: var(--ink);
}
.layer-item:hover { background: var(--surface-deep); }
.layer-item.active { background: #fff; box-shadow: inset 3px 0 0 var(--accent); }
.layer-item .li-name { font-weight: 650; font-size: 0.92rem; display: flex; justify-content: space-between; gap: 10px; }
.layer-item .li-count {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--faint);
  font-weight: 400;
  font-variant-numeric: tabular-nums;
}
.layer-item .li-desc {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 3px;
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.layer-detail {
  padding: 22px 26px 30px;
  max-height: 76vh;
  overflow-y: auto;
  background: #fff;
}
.layer-detail h2 {
  border: none;
  padding-top: 0;
  margin: 0 0 4px;
  font-size: 1.25rem;
}
.layer-detail .ld-desc { color: var(--muted); font-size: 0.92rem; max-width: 46rem; margin-bottom: 18px; }
.filter-row { display: flex; gap: 12px; align-items: center; margin: 0 0 14px; }
.filter-row input[type="search"] {
  flex: 1;
  max-width: 26rem;
  font: inherit;
  font-size: 0.88rem;
  padding: 7px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
}
.filter-row input[type="search"]:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: var(--accent); }
.filter-row .count { font-family: var(--mono); font-size: 0.74rem; color: var(--faint); white-space: nowrap; }

.file-row { border-bottom: 1px solid var(--hairline); }
.file-row > button {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 14px;
  width: 100%;
  text-align: left;
  border: none;
  background: none;
  font: inherit;
  cursor: pointer;
  padding: 10px 4px;
  align-items: baseline;
}
.file-row > button:hover { background: var(--surface); }
.file-row .fr-path { font-family: var(--mono); font-size: 0.78rem; color: var(--accent-deep); word-break: break-all; }
.file-row .fr-meta { font-family: var(--mono); font-size: 0.68rem; color: var(--faint); white-space: nowrap; }
.file-row .fr-sum { grid-column: 1 / -1; font-size: 0.85rem; color: var(--muted); max-width: 46rem; }
.file-detail {
  display: none;
  padding: 4px 4px 18px 4px;
}
.file-row.open .file-detail { display: block; }
.file-row.open > button { background: var(--surface); }
.file-detail h4 {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  font-weight: 600;
  margin: 16px 0 6px;
}
.member {
  display: grid;
  grid-template-columns: 15rem 1fr;
  gap: 16px;
  font-size: 0.82rem;
  padding: 5px 0;
  border-bottom: 1px dotted var(--hairline);
}
.member .m-name { font-family: var(--mono); font-size: 0.75rem; color: var(--ink); word-break: break-all; }
.member .m-name .ln { color: var(--faint); white-space: nowrap; }
.member .m-sum { color: var(--muted); }
.rel-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.rel-chip {
  font-family: var(--mono);
  font-size: 0.7rem;
  border: 1px solid var(--hairline);
  background: var(--surface);
  border-radius: 4px;
  padding: 2px 8px;
  color: var(--muted);
}
.tag-chip {
  font-family: var(--mono);
  font-size: 0.66rem;
  color: var(--accent-deep);
  background: #ddf4ff33;
  border: 1px solid #b6e3ff;
  border-radius: 10px;
  padding: 1px 8px;
}
.empty-note { color: var(--faint); font-size: 0.84rem; font-style: italic; }

/* ---------- tour ---------- */

.tour-toc {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 18px 22px;
  margin: 26px 0 10px;
  max-width: none;
  columns: 2;
  column-gap: 40px;
}
.tour-toc a {
  display: block;
  font-size: 0.88rem;
  padding: 4px 0;
  color: var(--ink);
  break-inside: avoid;
}
.tour-toc a:hover { color: var(--accent); text-decoration: none; }
.tour-toc a .n { font-family: var(--mono); font-size: 0.72rem; color: var(--faint); display: inline-block; width: 2.1em; }

.tour-step { margin-top: 54px; }
.tour-step .step-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  border-top: 1px solid var(--border);
  padding-top: 24px;
}
.tour-step .step-num {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent);
  white-space: nowrap;
}
.tour-step h2 { border: none; padding-top: 0; margin: 0; font-size: 1.3rem; }

/* ---------- pipeline stage table ---------- */

.stage-pill {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 8px;
  background: var(--surface);
  color: var(--ink);
  white-space: nowrap;
}
.stage-pill.loop { border-color: #eac54f; background: #fff8c5; color: #7d4e00; }

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .cols-2, .cols-3 { grid-template-columns: 1fr; gap: 8px; }
  .stat-band { grid-template-columns: 1fr 1fr; }
  .stat-band .cell:nth-child(3) { border-left: none; }
  .stat-band .cell { border-top: 1px solid var(--hairline); }
  .stat-band .cell:nth-child(-n+2) { border-top: none; }
  .explorer { grid-template-columns: 1fr; }
  .layer-list { max-height: 34vh; border-right: none; border-bottom: 1px solid var(--border); }
  .layer-detail { max-height: none; }
  .def-row { grid-template-columns: 1fr; gap: 4px; }
  .file-chip { grid-template-columns: 1fr; gap: 3px; }
  .member { grid-template-columns: 1fr; gap: 2px; }
  .dir a.dir-row { grid-template-columns: 2.4rem 1fr auto; }
  .dir .dsc { display: none; }
  .tour-toc { columns: 1; }
  .hero h1 { font-size: 2.2rem; }
  h1 { font-size: 1.9rem; }
  .dist-row { grid-template-columns: 8.5rem 1fr 3.6rem; gap: 8px; }
}

@media (max-width: 700px) {
  .topnav { position: static; }
}

@media (max-width: 560px) {
  main { padding: 0 18px 60px; }
  .topnav-inner { padding: 0 18px; }
  .topnav nav { margin-left: 0; padding-bottom: 6px; }
  .brand { padding-bottom: 4px; }
}