/*
  The Decision Files — shared stylesheet.
  Design tokens and component styles per:
  40-gtm/channels/content-seo/decision-files-site-build-spec.md

  Token values are taken directly from the spec's reference visual system
  (contrast-validated 2026-08-15: all text tokens >= 4.5:1, structural
  rules >= 3:1, in both themes). Do not invent new colors — extend this
  file if something is genuinely missing, per the same discipline the
  UpSight brand-style-guide.md asks of the product site.

  This is a deliberately different palette from UpSight's own marketing
  brand (brand-blue / amber). The Decision Files is an independent
  research publication, not a UpSight landing page — see "Independence
  is the product" in 30-strategy/decision-files-gameplan.md. The only
  place UpSight's own visual identity appears is the newsletter embed
  and the methodology disclosure.
*/

:root {
  --ground: #FAFAFB;
  --panel: #FFFFFF;
  --ink: #0E1116;
  --ink-2: #333B45;
  --ink-3: #4C5762;
  /* --rule is darkened from the reference artifact's #C9D0D8 (measured at
     1.56:1 against --panel — fails the spec's 3:1 structural-rule minimum).
     00-control/status.md (2026-08-15) already fixed this once, to #8C949E —
     reused here, nudged one step darker to #8A929C because #8C949E measures
     3.07:1 against --panel but only 2.94:1 against --ground (a background
     this token also sits on, e.g. .brief and .receipts-callout borders); the
     nudge clears 3:1 against both. --rule-2 stays faint by design — it's the
     row-hairline token that same baseline note explicitly kept sub-3:1 as
     decorative, not structural. */
  --rule: #8A929C;
  --rule-2: #E2E7EC;
  --accent: #12557F;
  --accent-soft: #DDEAF3;
  --tip: #7A5200;
  --tip-soft: #F7EBCE;
  --dead: #8A3232;
  --dead-soft: #F6E3E3;
  --flat: #5A6570;
  --flat-soft: #EAEDF0;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: "Inter Tight", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --serif: "Fraunces", Georgia, "Times New Roman", serif;

  /* fixed dark surface for the newsletter embed — intentionally NOT theme-aware.
     The embed ships with a hardcoded white (#ffffff) accent, so its section
     must always be dark, in both light and dark site themes. */
  --embed-bg: #11151A;
  --embed-text: #F3F6F9;
  --embed-text-dim: #AAB6C1;
  --embed-rule: #2A323C;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground: #11151A;
    --panel: #191E25;
    --ink: #F3F6F9;
    --ink-2: #C8D2DC;
    --ink-3: #AAB6C1;
    --rule: #66717D; /* from 00-control/status.md (2026-08-15): darkened from #3A444F (1.69:1) to clear 3:1 */
    --rule-2: #272E37;
    --accent: #7FBCE4;
    --accent-soft: #1A2E3C;
    --tip: #F0C264;
    --tip-soft: #332913;
    --dead: #E89898;
    --dead-soft: #3A2222;
    --flat: #9AA5B1;
    --flat-soft: #252B33;
  }
}

:root[data-theme="dark"] {
  --ground: #11151A;
  --panel: #191E25;
  --ink: #F3F6F9;
  --ink-2: #C8D2DC;
  --ink-3: #AAB6C1;
  --rule: #3A444F;
  --rule-2: #272E37;
  --accent: #7FBCE4;
  --accent-soft: #1A2E3C;
  --tip: #F0C264;
  --tip-soft: #332913;
  --dead: #E89898;
  --dead-soft: #3A2222;
  --flat: #9AA5B1;
  --flat-soft: #252B33;
}

* { box-sizing: border-box; }

html, body {
  max-width: 100%;
  overflow-x: hidden; /* page body never scrolls sideways — wide content scrolls in its own container */
}

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
}

.wrap-wide {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- top nav / masthead ---------- */

.site-nav {
  border-bottom: 1px solid var(--rule);
  padding: 18px 0;
}
.site-nav .wrap-wide {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.wordmark {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
}
.wordmark:hover { color: var(--accent); }
.site-nav-links {
  display: flex;
  gap: 22px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .04em;
}
.site-nav-links a {
  color: var(--ink-2);
  text-decoration: none;
}
.site-nav-links a:hover { color: var(--accent); }

/* ---------- sample / demonstration disclosure ---------- */

.sample-banner {
  background: var(--tip-soft);
  border-bottom: 1px solid var(--rule);
  color: var(--ink);
  padding: 14px 0;
}
.sample-banner .wrap-wide {
  display: flex;
  gap: 12px;
  align-items: baseline;
  flex-wrap: wrap;
}
.sample-banner .tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--tip);
  font-weight: 700;
  flex: none;
}
.sample-banner p {
  margin: 0;
  font-size: 14.5px;
  color: var(--ink-2);
  max-width: 74ch;
}
.sample-banner strong { color: var(--ink); }

/* ---------- article header ---------- */

.eyebrow {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-3);
}

article { padding: 44px 0 90px; }

.file-header { display: flex; flex-direction: column; gap: 14px; margin-bottom: 34px; }

h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(28px, 4.6vw, 42px);
  line-height: 1.14;
  letter-spacing: -.01em;
  font-weight: 600;
  text-wrap: balance;
}

.byline {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  font-size: 14px;
  color: var(--ink-2);
}
.byline .sep { color: var(--rule); }

/* ---------- 30-second brief ---------- */

.brief {
  border: 1px solid var(--rule);
  border-left: 4px solid var(--accent);
  border-radius: 4px;
  background: var(--panel);
  padding: 22px 24px;
  margin: 0 0 40px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.brief-title {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0;
}
.brief dl {
  margin: 0;
  display: grid;
  grid-template-columns: 148px 1fr;
  gap: 10px 20px;
}
.brief dt {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-top: 2px;
}
.brief dd {
  margin: 0;
  color: var(--ink);
  font-size: 15.5px;
  line-height: 1.5;
}
.brief dd.lesson { font-weight: 600; }
@media (max-width: 620px) {
  .brief dl { grid-template-columns: 1fr; gap: 3px 0; }
  .brief dt { padding-top: 10px; }
}

/* ---------- receipts callout ---------- */

.receipts-callout {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  border: 1px dashed var(--rule);
  border-radius: 4px;
  padding: 14px 18px;
  margin: 0 0 40px;
  font-size: 14.5px;
  color: var(--ink-2);
}
.receipts-callout a { font-weight: 600; white-space: nowrap; }

/* ---------- narrative sections ---------- */

section.narrative {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0 0 40px;
}
section.narrative h2 {
  margin: 0;
  font-size: 20px;
  letter-spacing: -.01em;
  font-weight: 660;
}
section.narrative p { margin: 0; color: var(--ink-2); font-size: 16px; max-width: 68ch; }
section.narrative .field-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-right: 8px;
}

/* ---------- pull quote / decision principle ---------- */

.pull-quote {
  border-left: 4px solid var(--tip);
  background: var(--tip-soft);
  border-radius: 4px;
  padding: 26px 28px;
  margin: 0 0 40px;
}
.pull-quote p {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.4;
  color: var(--ink);
  font-weight: 500;
}
.pull-quote cite {
  font-style: normal;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--ink-3);
}

/* ---------- widget / diagram panels ---------- */

.diagram {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 0 0 44px;
}
.diagram-head { display: flex; flex-direction: column; gap: 6px; }
.diagram-head h2 {
  margin: 0;
  font-size: 19px;
  letter-spacing: -.01em;
  font-weight: 660;
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.diagram-head .n {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--accent);
  letter-spacing: .08em;
}
.finding {
  margin: 0;
  color: var(--ink-2);
  font-size: 15px;
  max-width: 70ch;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 22px 20px;
  overflow-x: auto;
}

.source-line {
  font-size: 12.5px;
  color: var(--ink-3);
  margin: 0;
}
.source-line b { color: var(--ink-2); font-weight: 600; }

/* legend */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 16px 18px;
  margin: 0 0 30px;
}
.leg { display: flex; align-items: center; gap: 9px; font-size: 13.5px; color: var(--ink); }
.ic { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; flex: none; }
.ic svg { width: 13px; height: 13px; }
.ic.pass { background: var(--flat-soft); } .ic.pass svg { stroke: var(--flat); }
.ic.out { background: var(--dead-soft); } .ic.out svg { stroke: var(--dead); }
.ic.dec { background: var(--tip-soft); } .ic.dec svg { fill: var(--tip); stroke: none; }
.ic.win { background: var(--accent-soft); } .ic.win svg { stroke: var(--accent); }

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 14.5px;
  min-width: 600px;
}
th {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-2);
  text-align: left;
  font-weight: 400;
  padding: 0 14px 10px 0;
  border-bottom: 2px solid var(--rule);
}
td {
  padding: 13px 14px 13px 0;
  border-bottom: 1px solid var(--rule-2);
  vertical-align: middle;
  color: var(--ink-2);
}
td.k { color: var(--ink); font-weight: 580; }
td.w { font-variant-numeric: tabular-nums; color: var(--ink); white-space: nowrap; }
td.i { width: 34px; padding-right: 10px; }
.said { color: var(--ink); font-weight: 560; }

/* four-state feature matrix */
.matrix { min-width: 680px; }
.matrix th.v { text-align: center; color: var(--ink); }
.matrix td.c { text-align: center; width: 13%; }
.matrix tr.hot td { background: var(--tip-soft); }
.matrix tr.hot td.k { color: var(--ink); }
.m { display: inline-grid; place-items: center; }
.m-full { width: 26px; height: 26px; } .m-full svg { width: 22px; height: 22px; stroke: var(--accent); fill: none; stroke-width: 3.2; stroke-linecap: round; stroke-linejoin: round; }
.m-part { width: 26px; height: 26px; } .m-part svg { width: 19px; height: 19px; }
.m-paid { width: 26px; height: 26px; } .m-paid svg { width: 20px; height: 20px; }
.m-none { width: 26px; height: 26px; } .m-none svg { width: 11px; height: 11px; stroke: var(--dead); stroke-width: 3.6; stroke-linecap: round; fill: none; }
.m-key { width: 26px; height: 26px; } .m-key svg { width: 22px; height: 22px; fill: var(--tip); }

/* cost-by-problem */
.money td { font-variant-numeric: tabular-nums; }
.money td.n { text-align: right; width: 17%; color: var(--ink); white-space: nowrap; }
.money tr.total td { border-top: 2px solid var(--rule); font-weight: 660; color: var(--ink); padding-top: 14px; }
.money tr.hot td { background: var(--tip-soft); }
.delta { color: var(--tip); font-weight: 660; }

/* decision timeline — vertical, HTML/CSS (not SVG), so it reflows cleanly at 375px */
.vtimeline { display: flex; flex-direction: column; min-width: 280px; }
.vt-item {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 18px;
  padding-bottom: 30px;
  position: relative;
}
.vt-item:last-child { padding-bottom: 0; }
.vt-rail { position: relative; }
.vt-rail::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 22px;
  bottom: -30px;
  width: 2px;
  background: var(--rule);
  transform: translateX(-50%);
}
.vt-item:last-child .vt-rail::after { display: none; }
.vt-dot {
  display: block;
  width: 16px;
  height: 16px;
  margin: 2px auto 0;
  border-radius: 50%;
  position: relative;
  z-index: 1;
  border: 3px solid var(--panel);
  box-shadow: 0 0 0 1.5px var(--rule);
}
.vt-dot-accent { background: var(--accent); box-shadow: 0 0 0 1.5px var(--accent); }
.vt-dot-flat { background: var(--rule); box-shadow: 0 0 0 1.5px var(--rule); }
.vt-dot-tip { background: var(--tip); box-shadow: 0 0 0 1.5px var(--tip); width: 18px; height: 18px; }
.vt-content { min-width: 0; }
.vt-content-hot {
  background: var(--tip-soft);
  border-radius: 4px;
  padding: 12px 14px;
  margin: -8px 0;
}
.vt-eyebrow {
  margin: 0 0 3px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--ink-3);
}
.vt-kind { text-transform: none; letter-spacing: 0; }
.vt-dur {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink-2);
  background: var(--flat-soft);
  border-radius: 3px;
  padding: 1px 6px;
  margin-left: 4px;
}
.vt-title { margin: 0 0 4px; font-size: 15px; font-weight: 660; color: var(--ink); }
.vt-detail { margin: 0; font-size: 14px; color: var(--ink-2); }

/* click-to-quote degrade: <details> disclosure of the evidence behind a diagram */
.quotes {
  border: 1px solid var(--rule);
  border-top: none;
  border-radius: 0 0 6px 6px;
  background: var(--panel);
  padding: 2px 20px 4px;
  margin-top: -14px;
}
.quotes summary {
  cursor: pointer;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 12px 0;
}
.quotes blockquote {
  margin: 0 0 14px;
  padding-left: 14px;
  border-left: 2px solid var(--rule);
  font-size: 14.5px;
  color: var(--ink-2);
  font-style: italic;
}
.quotes blockquote:last-child { margin-bottom: 16px; }
.quotes .receipt-link { font-family: var(--mono); font-size: 11px; font-style: normal; }

/* ---------- methodology footer ---------- */

.methodology {
  border-top: 2px solid var(--rule);
  padding-top: 26px;
  margin-top: 10px;
  color: var(--ink-2);
  font-size: 14px;
  max-width: 72ch;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.methodology .field-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* ---------- newsletter embed section ---------- */

.newsletter-section {
  background: var(--embed-bg);
  border-top: 1px solid var(--embed-rule);
  padding: 52px 0;
  margin-top: 60px;
}
.newsletter-inner {
  max-width: 560px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: center;
}
.newsletter-inner .eyebrow { color: var(--embed-text-dim); }
.newsletter-inner h2 {
  margin: 0 0 4px;
  font-family: var(--serif);
  font-size: 22px;
  color: var(--embed-text);
  font-weight: 600;
}
.newsletter-inner p {
  margin: 0 0 18px;
  color: var(--embed-text-dim);
  font-size: 14.5px;
}

/* ---------- site footer ---------- */

.site-footer {
  padding: 36px 0 60px;
  color: var(--ink-3);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.site-footer a { color: var(--ink-3); }

/* ---------- index page: file list ---------- */

.standfirst { color: var(--ink-2); font-size: 17px; max-width: 62ch; margin: 10px 0 0; }
.file-list { list-style: none; margin: 46px 0 0; padding: 0; display: flex; flex-direction: column; }
.file-row {
  display: block;
  padding: 22px 0;
  border-top: 1px solid var(--rule-2);
  text-decoration: none;
  color: inherit;
}
.file-list .file-row:last-child { border-bottom: 1px solid var(--rule-2); }
.file-row:hover .file-row-title { color: var(--accent); }
.file-row-top {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: baseline;
  flex-wrap: wrap;
}
.file-row-title {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
}
.file-row-date {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
  white-space: nowrap;
}
.file-row-meta {
  font-size: 13.5px;
  color: var(--ink-2);
  margin-top: 4px;
}
.file-row-principle {
  font-size: 14.5px;
  color: var(--ink-2);
  margin-top: 8px;
  max-width: 64ch;
}
.badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--tip);
  background: var(--tip-soft);
  border-radius: 3px;
  padding: 3px 7px;
  margin-right: 8px;
  vertical-align: middle;
  font-weight: 700;
}

.index-note {
  margin: 40px 0 0;
  padding: 16px 18px;
  border: 1px dashed var(--rule);
  border-radius: 4px;
  color: var(--ink-2);
  font-size: 13.5px;
}