/* Visual language shared with the Telco churn analysis site: same tokens, type and charts. */

/* ---------- Design tokens ---------- */
:root {
  color-scheme: light;
  --space-block: 32px;   /* text -> figure, table, grid */
  --space-gallery: 24px; /* text -> image gallery */
  --page: #ffffff;
  --raised: #ffffff;
  --code-bg: #f4f6f9;
  --ink: #16233a;            /* headings */
  --text: #2c3548;           /* body copy */
  --text-secondary: #4c566a;
  --muted: #646d7f;
  --hairline: #e2e6ec;
  --grid: #e8ebf0;
  --baseline: #c3c9d3;
  --accent: #2a78d6;         /* the bar where the risk is */
  --accent-hover: #1c5cab;
  --context: #b3b9c4;        /* every other bar */
  --context-hover: #9aa2b0;
  --link: #1c5cab;
  --good: #1f7a4d;
  --good-bg: #e6f4ec;
  --warn: #8a5a00;
  --warn-bg: #fbf0d9;
  --bad: #b42318;
  --bad-bg: #fdeceb;
  --exhausted: #d9534f;

  --font: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --page: #11151c;
    --raised: #1a2029;
    --code-bg: #171c24;
    --ink: #eef1f6;
    --text: #d5dae2;
    --text-secondary: #b9c0cc;
    --muted: #8b94a4;
    --hairline: #262d39;
    --grid: #222936;
    --baseline: #3a4352;
    --accent: #3987e5;
    --accent-hover: #5598e7;
    --context: #4b5566;
    --context-hover: #5d6879;
    --link: #6da7ec;
    --good: #5cc28e;
    --good-bg: #16301f;
    --warn: #e0b45c;
    --warn-bg: #342813;
    --bad: #f08a80;
    --bad-bg: #3a1c1a;
    --exhausted: #e0716c;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #11151c;
  --raised: #1a2029;
  --code-bg: #171c24;
  --ink: #eef1f6;
  --text: #d5dae2;
  --text-secondary: #b9c0cc;
  --muted: #8b94a4;
  --hairline: #262d39;
  --grid: #222936;
  --baseline: #3a4352;
  --accent: #3987e5;
  --accent-hover: #5598e7;
  --context: #4b5566;
  --context-hover: #5d6879;
  --link: #6da7ec;
  --good: #5cc28e;
  --good-bg: #16301f;
  --warn: #e0b45c;
  --warn-bg: #342813;
  --bad: #f08a80;
  --bad-bg: #3a1c1a;
  --exhausted: #e0716c;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--page);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { color: var(--ink); margin: 0; font-weight: 600; }
p { margin: 0 0 1em; }
a { color: var(--link); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
strong { font-weight: 600; color: var(--ink); }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--page) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--hairline);
}
.topbar-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 56px; }
.brand { color: var(--ink); font-weight: 600; text-decoration: none; font-size: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0; }
nav { display: flex; align-items: center; gap: 20px; font-size: 15px; }
nav a { color: var(--text-secondary); text-decoration: none; }
nav a:hover { color: var(--ink); }

.lang-switch { display: inline-flex; gap: 2px; padding: 2px; border: 1px solid var(--hairline); border-radius: 6px; }
.lang-switch button {
  font: inherit; font-size: 13px; font-weight: 500; line-height: 1.4;
  color: var(--text-secondary); background: none; border: 0; border-radius: 4px;
  padding: 3px 8px; cursor: pointer;
}
.lang-switch button:hover { color: var(--ink); }
.lang-switch button[aria-pressed="true"] { background: var(--ink); color: var(--page); }

/* ---------- Hero ---------- */
.hero { padding-top: 80px; padding-bottom: 56px; }
.hero h1 {
  font-size: clamp(34px, 5.4vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 19ch;
}
.lede { font-size: 19px; line-height: 1.55; color: var(--text-secondary); max-width: 54ch; margin-top: 24px; }
.hero-links { display: flex; flex-wrap: wrap; gap: 12px 24px; font-size: 16px; margin: 28px 0 48px; }

.kpis {
  display: grid; grid-template-columns: repeat(4, 1fr);
  margin: 0; border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline);
}
.kpi { padding: 20px 20px 20px 0; }
.kpi + .kpi { padding-left: 20px; border-left: 1px solid var(--hairline); }
.kpi dt { font-size: 14px; color: var(--muted); }
.kpi dd { margin: 0; }
.kpi .kpi-value { font-size: 32px; font-weight: 600; color: var(--ink); line-height: 1.25; margin-top: 4px; }
.kpi-note { font-size: 14px; color: var(--text-secondary); }

/* ---------- Finding sections ---------- */
.finding {
  display: grid; grid-template-columns: 170px minmax(0, 1fr); gap: 32px;
  padding-top: 64px; padding-bottom: 64px;
  border-top: 1px solid var(--hairline);
}
#findings > .finding:first-child { border-top: 0; }
.finding-tag { font-size: 14px; color: var(--muted); margin: 6px 0 0; }
.finding-tag span { display: block; }
.finding-tag span + span { color: var(--text-secondary); font-weight: 500; }
.finding-body > p { max-width: 64ch; }
.finding h2 {
  font-size: clamp(24px, 3vw, 31px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  max-width: 28ch;
  margin-bottom: 16px;
}

/* ---------- Figures ---------- */
figure { margin: 0; min-width: 0; }
figcaption { font-size: 15px; font-weight: 600; color: var(--ink); margin-bottom: 12px; }
.figure-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin-top: var(--space-block); align-items: start; }
.figure-wide { margin-top: var(--space-block); max-width: 720px; }
.chart { position: relative; width: 100%; }

/* ---------- View SQL panels ---------- */
.query { margin-top: 16px; font-size: 14px; }
.query summary {
  cursor: pointer; color: var(--link); width: fit-content;
  list-style-position: inside; padding: 4px 0;
}
.query[open] summary { margin-bottom: 8px; }
.query-file { color: var(--muted); margin: 0 0 8px; }
.query pre {
  margin: 0 0 12px; padding: 14px 16px; overflow-x: auto;
  background: var(--code-bg); border: 1px solid var(--hairline); border-radius: 6px;
  font-family: var(--mono); font-size: 13px; line-height: 1.55; color: var(--text);
  tab-size: 4;
}
.query-table { overflow-x: auto; }
.query table { border-collapse: collapse; font-size: 13px; font-variant-numeric: tabular-nums; }
.query th, .query td { padding: 6px 12px 6px 0; text-align: left; border-bottom: 1px solid var(--hairline); white-space: nowrap; }
.query th { color: var(--muted); font-weight: 500; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--hairline); padding: 28px 0 40px; font-size: 15px; color: var(--muted); }
.footer p { margin: 0; }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 24px; }
.footer-links { display: flex; gap: 20px; }

/* ---------- Additions for this site ---------- */
.eyebrow { font-size: 14px; font-weight: 500; color: var(--muted); letter-spacing: 0.02em; margin-bottom: 18px; }
.hero h1 { max-width: 22ch; }
nav .nav-api { color: var(--link); }

.section-intro { padding-top: 72px; padding-bottom: 8px; border-top: 1px solid var(--hairline); }
.section-intro h2 { font-size: clamp(28px, 3.6vw, 38px); letter-spacing: -0.015em; line-height: 1.15; margin-bottom: 12px; }
.section-intro p { max-width: 68ch; color: var(--text-secondary); }
.section-intro + .finding { border-top: 0; }

.sub-heading { font-size: 18px; margin: 48px 0 12px; }

/* facts and stats */
.facts, .stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; margin: var(--space-block) 0 0;
  border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline);
}
.fact, .stat { padding: 16px 16px 16px 0; }
.fact + .fact, .stat + .stat { padding-left: 16px; border-left: 1px solid var(--hairline); }
.fact dt, .stat dt { font-size: 13px; color: var(--muted); line-height: 1.4; }
.fact dd, .stat dd { margin: 4px 0 0; font-size: 24px; font-weight: 600; color: var(--ink); line-height: 1.25; }
.stat .stat-note { font-size: 13px; font-weight: 400; color: var(--text-secondary); margin-top: 2px; }

/* diagrams */
.diagram { margin-top: var(--space-block); }
.diagram img {
  display: block; width: 100%; height: auto; border: 1px solid var(--hairline); border-radius: 6px;
  background: #ffffff;   /* the BPMN and UML exports have a white background in both themes */
}
.diagram img.diagram-narrow { max-width: 760px; }
.figure-note { font-size: 14px; color: var(--text-secondary); margin-top: 10px; max-width: 72ch; }

/* flows */
.flows { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: var(--space-block); }
.flow { border: 1px solid var(--hairline); border-radius: 8px; padding: 18px; background: var(--raised); }
.flow h3 { font-size: 16px; margin-bottom: 8px; }
.flow p { font-size: 15px; color: var(--text-secondary); margin: 0; }
code { font-family: var(--mono); font-size: 0.88em; }
.flow code, .data-table code { background: var(--code-bg); padding: 1px 4px; border-radius: 4px; border: 1px solid var(--hairline); white-space: nowrap; }

/* data tables */
.table-wrap { margin-top: var(--space-block); overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: 15px; font-variant-numeric: tabular-nums; }
.data-table th {
  font-size: 13px; font-weight: 500; color: var(--muted); text-align: left;
  padding: 0 14px 10px 0; border-bottom: 1px solid var(--baseline); vertical-align: bottom;
}
.data-table td { padding: 12px 14px 12px 0; border-bottom: 1px solid var(--hairline); vertical-align: top; }
.data-table .num { text-align: right; white-space: nowrap; }
.data-table th.num { white-space: normal; }
.data-table .group-row td {
  padding-top: 22px; font-size: 13px; font-weight: 600; color: var(--ink); border-bottom: 1px solid var(--baseline);
}
.data-table .group-row .count { color: var(--muted); font-weight: 500; margin-left: 6px; }
.data-table .muted { color: var(--muted); font-size: 14px; }
.data-table .ref { font-family: var(--mono); font-size: 13px; white-space: nowrap; }
.data-table .cell-sub { display: block; font-size: 13px; color: var(--muted); margin-top: 2px; }
.endpoints td:last-child { color: var(--muted); font-size: 14px; white-space: nowrap; }

/* status badges */
.badge {
  display: inline-block; font-size: 12.5px; font-weight: 600; line-height: 1.3;
  padding: 3px 9px; border-radius: 999px; white-space: nowrap;
}
.badge.met { color: var(--good); background: var(--good-bg); }
.badge.partly { color: var(--warn); background: var(--warn-bg); }
.badge.not-met { color: var(--bad); background: var(--bad-bg); }
.scorecard td:first-child { font-weight: 600; color: var(--ink); white-space: nowrap; }
.scorecard .goal-metric { display: block; font-weight: 500; color: var(--ink); }
.scorecard .goal-target { display: block; font-size: 13px; color: var(--muted); margin-top: 2px; }
.scorecard .result { font-weight: 600; color: var(--ink); }

/* artefact cards */
.method-lede { max-width: 68ch; color: var(--text-secondary); margin-top: 12px; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: var(--space-block); }
.card {
  display: flex; flex-direction: column; gap: 6px; padding: 18px; text-decoration: none;
  border: 1px solid var(--hairline); border-radius: 8px; background: var(--raised); color: var(--text);
}
.card:hover { border-color: var(--baseline); }
.card:hover h3 { color: var(--link); }
.card-kicker { font-size: 12.5px; color: var(--muted); font-weight: 500; letter-spacing: 0.02em; }
.card h3 { font-size: 16.5px; }
.card p { font-size: 14.5px; color: var(--text-secondary); margin: 0; flex: 1; }
.card-figure { font-size: 13.5px; font-weight: 600; color: var(--ink); margin-top: 6px; }

/* lazily loaded UML */
.uml { margin-top: 20px; }
.uml summary { cursor: pointer; color: var(--link); font-size: 15px; width: fit-content; padding: 4px 0; }
.uml-grid { display: grid; gap: 28px; margin-top: 16px; }
.uml-grid figure { border: 1px solid var(--hairline); border-radius: 6px; padding: 16px; background: var(--raised); overflow-x: auto; }
.uml-grid svg { max-width: 100%; height: auto; }
.uml-status { font-size: 14px; color: var(--muted); }

/* plan timeline */
.timeline { list-style: none; padding: 0; margin: var(--space-block) 0 0; display: grid; gap: 0; }
.finding-body { min-width: 0; }
.timeline li {
  display: grid; grid-template-columns: 150px 200px minmax(0, 1fr) 64px; gap: 16px; align-items: baseline;
  grid-template-areas: "step dates goal points";
  padding: 12px 0; border-bottom: 1px solid var(--hairline); font-size: 15px;
}
.timeline li:first-child { border-top: 1px solid var(--hairline); }
.timeline .step { grid-area: step; font-weight: 600; color: var(--ink); }
.timeline .dates { grid-area: dates; color: var(--muted); font-size: 14px; }
.timeline .goal { grid-area: goal; color: var(--text-secondary); }
.timeline .points { grid-area: points; text-align: right; font-variant-numeric: tabular-nums; color: var(--ink); font-weight: 600; }
.timeline .milestone .step { color: var(--accent); }

/* wireframes */
.wireframes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px 16px; margin-top: var(--space-gallery); }
.wireframes figure { margin: 0; }
.wireframes img { display: block; width: 100%; height: auto; border: 1px solid var(--hairline); border-radius: 6px; background: #fff; }
.wireframes.shots { grid-template-columns: repeat(2, 1fr); }
.wireframes figcaption { font-size: 13.5px; font-weight: 500; color: var(--text-secondary); margin: 8px 0 0; }

@media (max-width: 900px) {
  .finding { grid-template-columns: minmax(0, 1fr); gap: 12px; padding-top: 48px; padding-bottom: 48px; }
  .finding-tag span { display: inline; }
  .finding-tag span + span { margin-left: 8px; }
  .figure-pair, .method-grid { grid-template-columns: 1fr; gap: 36px; }
  .kpis, .facts, .stats { grid-template-columns: 1fr 1fr; }
  .kpi:nth-child(3), .fact:nth-child(3), .stat:nth-child(3) { padding-left: 0; border-left: 0; }
  .kpi:nth-child(n + 3), .fact:nth-child(n + 3), .stat:nth-child(n + 3) { border-top: 1px solid var(--hairline); }
  .flows, .cards, .wireframes { grid-template-columns: 1fr 1fr; }
  .timeline li { grid-template-columns: 120px minmax(0, 1fr) 56px; grid-template-areas: "step dates points" "goal goal goal"; gap: 4px 16px; }
}

@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
  .hero { padding-top: 48px; padding-bottom: 48px; }
  .lede { font-size: 17px; }
  .brand { font-size: 14px; }
  .kpi .kpi-value { font-size: 26px; }
  .fact dd, .stat dd { font-size: 20px; }
  nav .nav-section, nav .nav-gh { display: none; }
  nav { gap: 14px; }
  .flows, .cards, .wireframes, .wireframes.shots { grid-template-columns: 1fr; }
  .timeline li { grid-template-columns: minmax(0, 1fr) auto; grid-template-areas: "step points" "dates dates" "goal goal"; gap: 2px 12px; }
  .data-table { font-size: 14px; }

  /* the scorecard and the exception report turn into stacked rows on phones */
  .data-table.stack thead { display: none; }
  .data-table.stack, .data-table.stack tbody, .data-table.stack tr, .data-table.stack td { display: block; width: 100%; }
  .data-table.stack tr { border-bottom: 1px solid var(--hairline); padding: 10px 0; }
  .data-table.stack tr.group-row { border-bottom: 1px solid var(--baseline); }
  .data-table.stack td { border: 0; padding: 3px 0; }
  .data-table.stack td[data-label]::before { content: attr(data-label) "  "; color: var(--muted); font-size: 13px; }
}

/* ---------- Reading guide ---------- */
.guide { padding-top: 64px; padding-bottom: 64px; border-top: 1px solid var(--hairline); }
.guide > h2 { font-size: clamp(24px, 3vw, 31px); line-height: 1.2; letter-spacing: -0.01em; }
.guide-lede { max-width: 68ch; color: var(--text-secondary); margin-top: 12px; }
.guide-steps { list-style: none; padding: 0; margin: var(--space-block) 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.guide-steps a {
  display: grid; grid-template-columns: 28px minmax(0, 1fr); column-gap: 12px; row-gap: 4px; align-content: start;
  height: 100%; padding: 16px 18px; border: 1px solid var(--hairline); border-radius: 8px;
  background: var(--raised); color: var(--text); text-decoration: none;
}
.guide-steps a:hover { border-color: var(--baseline); }
.guide-steps a:hover strong { color: var(--link); }
.guide-num {
  grid-row: span 2; display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%;
  background: var(--code-bg); border: 1px solid var(--hairline); font-size: 13px; font-weight: 600; color: var(--ink);
}
.guide-steps strong { font-size: 16px; line-height: 28px; }
.guide-text { font-size: 14.5px; line-height: 1.5; color: var(--text-secondary); }
.glossary { display: grid; grid-template-columns: 1fr 1fr; gap: 0 40px; margin: 0; }
.glossary div { display: grid; grid-template-columns: 130px minmax(0, 1fr); gap: 12px; padding: 12px 0; border-top: 1px solid var(--hairline); }
.glossary dt { font-size: 15px; font-weight: 600; color: var(--ink); }
.glossary dd { margin: 0; font-size: 14.5px; line-height: 1.5; color: var(--text-secondary); }

@media (max-width: 900px) {
  .guide-steps { grid-template-columns: 1fr 1fr; }
  .glossary { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .guide { padding-top: 48px; padding-bottom: 48px; }
  .guide-steps { grid-template-columns: 1fr; }
  .glossary div { grid-template-columns: 1fr; gap: 2px; }
}

.nowrap { white-space: nowrap; }

/* Labels that wrap to two lines must not push their numbers down: each box shares the rows of its row. */
@supports (grid-template-rows: subgrid) {
  .kpi { display: grid; grid-row: span 3; grid-template-rows: subgrid; align-content: start; }
  .fact { display: grid; grid-row: span 2; grid-template-rows: subgrid; }
  .stat { display: grid; grid-row: span 3; grid-template-rows: subgrid; }
  .kpi dt, .fact dt, .stat dt { align-self: start; }
}

/* the last block of a section never adds its own bottom margin to the section padding */
.finding-body > :last-child, .section-intro > :last-child, .method > :last-child, .guide > :last-child { margin-bottom: 0; }

/* ---------- Analysis and plan sections ---------- */
.method { padding-top: 72px; padding-bottom: 72px; border-top: 1px solid var(--hairline); }
.method > h2 { font-size: clamp(28px, 3.6vw, 38px); letter-spacing: -0.015em; line-height: 1.15; max-width: 34ch; }
.method-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin-top: 48px; }
.method-grid h3 { font-size: 16px; margin-bottom: 8px; }
.method-grid ul { margin: 0; padding-left: 1.2em; font-size: 16px; }
.method-grid li { margin-bottom: 6px; }
.source { margin-top: 32px; font-size: 15px; color: var(--text-secondary); }
@media (max-width: 900px) {
  .method-grid { grid-template-columns: 1fr; gap: 36px; }
  .method { padding-top: 48px; padding-bottom: 48px; }
  .section-intro { padding-top: 56px; }
}