/* ============================================================
   Use Cases — Commercial & Change Control
   Per-page CSS, brand tokens only. Light mode; Arch Purple is the
   single accent. Maps to a future page-commercial-change.php.

   Visual language for this page is CAUSALITY and MONEY: value
   ledgers, a change-ripple tree, impact-before-commitment panels
   and requirement drift. Deliberately not the registers, matrices,
   gantts or status boards used on the sibling use-case pages.
   ============================================================ */

.ch-page { background: var(--color-draft-white); }
.ch-inner { max-width: 1200px; margin: 0 auto; padding: 0 40px; }

.ch-eyebrow {
  font-family: var(--font-mono);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 12px;
  color: var(--color-arch-purple);
  margin: 0 0 20px;
}
.ch-h2 {
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--color-data-black);
  margin: 0 0 18px;
  text-wrap: balance;
}
.ch-h2 .accent { color: var(--color-arch-purple); font-weight: 400; }
.ch-body {
  font-size: 16.5px;
  line-height: 1.7;
  color: var(--fg-secondary);
  margin: 0 0 16px;
  text-wrap: pretty;
}
.ch-body:last-child { margin-bottom: 0; }
.ch-body strong { color: var(--color-data-black); font-weight: 600; }
.ch-body a { color: var(--color-arch-purple); text-decoration: underline; text-underline-offset: 3px; }
.ch-body a:hover { color: var(--purple-700); }

.ch-sec { padding: 96px 0; }
.ch-sec--alt { background: var(--bg-section-alt); }
.ch-sec--grey { background: var(--color-light-gray); }
.ch-sec__head { max-width: 800px; margin: 0 0 52px; }

/* Standard brand background set, shared by every section that exposes a
   background choice. Light fills and washes keep dark copy; the bold purple
   bands flip copy to white and hold Arch Purple through the first 40% of the
   ramp, so a tall section's heading still clears AA contrast. */
.ch-sec[data-bg="light-grey"]     { background: var(--color-light-gray); }
.ch-sec[data-bg="light-blue"]     { background: var(--bg-section-alt); }
.ch-sec[data-bg="light-lavender"] { background: var(--purple-50); }
.ch-sec[data-bg="white"]          { background: var(--color-draft-white); }

.ch-sec[data-bg="lavender-wash"] {
  background:
    radial-gradient(120% 90% at 50% -10%, var(--purple-50) 0%, rgba(236, 236, 252, 0) 60%),
    var(--color-draft-white);
}
.ch-sec[data-bg="sky-wash"] {
  background:
    radial-gradient(120% 90% at 50% -10%, var(--color-sky-100) 0%, rgba(236, 236, 252, 0) 60%),
    var(--color-draft-white);
}
.ch-sec[data-bg="lavender-white"] { background: linear-gradient(180deg, var(--purple-50), var(--color-draft-white)); }
.ch-sec[data-bg="sky-white"]      { background: linear-gradient(180deg, var(--color-sky-100), var(--color-draft-white)); }
.ch-sec[data-bg="lavender-sky"]   { background: linear-gradient(135deg, var(--purple-50), var(--color-sky-50)); }
.ch-sec[data-bg="periwinkle-soft"]{ background: linear-gradient(180deg, var(--purple-100), var(--color-draft-white)); }
.ch-sec[data-bg="sky-lavender"]   { background: linear-gradient(135deg, var(--color-sky-100), var(--purple-50)); }
.ch-sec[data-bg="lavender-glow"]  { background: radial-gradient(70% 60% at 50% 45%, var(--purple-50) 0%, var(--color-draft-white) 75%); }
.ch-sec[data-bg="cool-mist"]      { background: linear-gradient(135deg, var(--color-sky-50), var(--purple-50)); }
.ch-sec[data-bg="gray-fade"]      { background: linear-gradient(180deg, var(--color-light-gray), var(--color-draft-white)); }
.ch-sec[data-bg="lilac-wash"] {
  background:
    radial-gradient(120% 90% at 50% -10%, var(--color-lavender) 0%, rgba(255, 255, 255, 0) 62%),
    var(--color-draft-white);
}

/* Bold purple bands. The ramps run dark to bright so white body copy stays
   legible at every point: --purple-700 (7.69:1) through Arch Purple /
   --purple-500 (5.67:1) to a light end at ~4.6:1. The light end is a token
   mix rather than a scale step because no step between --purple-500 and
   --purple-400 clears 4.5:1 (--purple-400 measures 4.11:1); raw Taro and
   Lavender are 2.23:1 and 2.03:1. */
.ch-sec[data-bg="indigo-fade"]     { background: linear-gradient(135deg, var(--purple-700), color-mix(in oklab, var(--color-taro) 20%, var(--color-arch-purple))); }
.ch-sec[data-bg="purple-taro"]     { background: linear-gradient(135deg, var(--color-arch-purple), color-mix(in oklab, var(--color-taro) 20%, var(--color-arch-purple))); }
.ch-sec[data-bg="purple-lavender"] { background: linear-gradient(135deg, var(--purple-700), color-mix(in oklab, var(--color-lavender) 12%, var(--color-arch-purple))); }
.ch-sec[data-bg="deep-indigo"]     { background: linear-gradient(135deg, var(--purple-700), var(--color-arch-purple)); }
.ch-sec[data-bg="vertical-purple"] { background: linear-gradient(180deg, var(--purple-700), color-mix(in oklab, var(--color-taro) 20%, var(--color-arch-purple))); }
.ch-sec[data-bg="purple-corner"]   { background: radial-gradient(115% 135% at 18% 25%, color-mix(in oklab, var(--color-taro) 20%, var(--color-arch-purple)) 0%, var(--purple-700) 100%); }
.ch-sec[data-bg="gradient-hero"]   { background: linear-gradient(115deg, var(--purple-700) 0%, var(--color-arch-purple) 50%, color-mix(in oklab, var(--color-taro) 20%, var(--color-arch-purple)) 100%); }

.ch-sec[data-bg="indigo-fade"] .ch-eyebrow,
.ch-sec[data-bg="purple-taro"] .ch-eyebrow,
.ch-sec[data-bg="purple-lavender"] .ch-eyebrow,
.ch-sec[data-bg="deep-indigo"] .ch-eyebrow,
.ch-sec[data-bg="vertical-purple"] .ch-eyebrow,
.ch-sec[data-bg="purple-corner"] .ch-eyebrow,
.ch-sec[data-bg="gradient-hero"] .ch-eyebrow,
.ch-sec[data-bg="indigo-fade"] .ch-h2,
.ch-sec[data-bg="purple-taro"] .ch-h2,
.ch-sec[data-bg="purple-lavender"] .ch-h2,
.ch-sec[data-bg="deep-indigo"] .ch-h2,
.ch-sec[data-bg="vertical-purple"] .ch-h2,
.ch-sec[data-bg="purple-corner"] .ch-h2,
.ch-sec[data-bg="gradient-hero"] .ch-h2,
.ch-sec[data-bg="indigo-fade"] .ch-h2 .accent,
.ch-sec[data-bg="purple-taro"] .ch-h2 .accent,
.ch-sec[data-bg="purple-lavender"] .ch-h2 .accent,
.ch-sec[data-bg="deep-indigo"] .ch-h2 .accent,
.ch-sec[data-bg="vertical-purple"] .ch-h2 .accent,
.ch-sec[data-bg="purple-corner"] .ch-h2 .accent,
.ch-sec[data-bg="gradient-hero"] .ch-h2 .accent,
.ch-sec[data-bg="indigo-fade"] .ch-body,
.ch-sec[data-bg="purple-taro"] .ch-body,
.ch-sec[data-bg="purple-lavender"] .ch-body,
.ch-sec[data-bg="deep-indigo"] .ch-body,
.ch-sec[data-bg="vertical-purple"] .ch-body,
.ch-sec[data-bg="purple-corner"] .ch-body,
.ch-sec[data-bg="gradient-hero"] .ch-body,
.ch-sec[data-bg="indigo-fade"] .ch-list li,
.ch-sec[data-bg="purple-taro"] .ch-list li,
.ch-sec[data-bg="purple-lavender"] .ch-list li,
.ch-sec[data-bg="deep-indigo"] .ch-list li,
.ch-sec[data-bg="vertical-purple"] .ch-list li,
.ch-sec[data-bg="purple-corner"] .ch-list li,
.ch-sec[data-bg="gradient-hero"] .ch-list li,
.ch-sec[data-bg="indigo-fade"] .ch-body strong,
.ch-sec[data-bg="purple-taro"] .ch-body strong,
.ch-sec[data-bg="purple-lavender"] .ch-body strong,
.ch-sec[data-bg="deep-indigo"] .ch-body strong,
.ch-sec[data-bg="vertical-purple"] .ch-body strong,
.ch-sec[data-bg="purple-corner"] .ch-body strong,
.ch-sec[data-bg="gradient-hero"] .ch-body strong { color: var(--color-draft-white); }

/* on a bold band the list marker needs to read against purple */
.ch-sec[data-bg="indigo-fade"] .ch-list li::before,
.ch-sec[data-bg="purple-taro"] .ch-list li::before,
.ch-sec[data-bg="purple-lavender"] .ch-list li::before,
.ch-sec[data-bg="deep-indigo"] .ch-list li::before,
.ch-sec[data-bg="vertical-purple"] .ch-list li::before,
.ch-sec[data-bg="purple-corner"] .ch-list li::before,
.ch-sec[data-bg="gradient-hero"] .ch-list li::before { background: var(--color-draft-white); }

/* ---------- 1. HERO ---------- */
/* The architecture photograph sits behind the whole hero, visible from the
   very top. Values baked from the Tweaks panel: full opacity, 34% vertical
   position, no wash over it. */
.ch-hero {
  position: relative;
  padding: 72px 0 64px;
  background: var(--color-draft-white);
}
.ch-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  /* url() resolves against this stylesheet, not the document */
  background-image: url("../backgrounds/hero-architecture.jpg");
  background-size: cover;
  background-position: center 34%;
  background-repeat: no-repeat;
}
.ch-hero__inner { position: relative; z-index: 2; }
.ch-hero__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 48px;
  align-items: center;
}
.ch-hero__copy { min-width: 0; }
.ch-hero__viz { min-width: 0; }
.ch-hero__title {
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: clamp(34px, 3.7vw, 52px);
  line-height: 1.07;
  letter-spacing: -0.022em;
  color: var(--color-data-black);
  margin: 0 0 20px;
  text-wrap: pretty;
}
.ch-hero__title .accent { color: var(--color-arch-purple); font-weight: 400; }
.ch-hero__lede { font-size: 17px; line-height: 1.62; color: var(--fg-secondary); margin: 0; max-width: 54ch; }
/* Hero points. Henry's note: the subtext was too long to scan, so the claim
   sits in one line and the three mechanisms become bullets. */
.ch-hero__points {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 11px;
  max-width: 56ch;
}
.ch-hero__points li {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 12px;
  align-items: start;
  font-size: 15.5px;
  line-height: 1.55;
  color: var(--fg-secondary);
}
.ch-hero__points li::before {
  content: "";
  width: 7px;
  height: 7px;
  margin-top: 9px;
  border-radius: 999px;
  background: var(--color-arch-purple);
}
.ch-hero__points strong { color: var(--color-data-black); font-weight: 600; }

.ch-chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 26px 0 0; padding: 0; list-style: none; }
.ch-chips li {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-arch-purple);
  background: var(--color-draft-white);
  border: 1px solid var(--purple-100, #E2E2FA);
  border-radius: 999px;
  padding: 6px 13px;
}

.ch-viz-card {
  background: var(--color-draft-white);
  border: 1px solid var(--border-subtle, #EAEAEA);
  border-radius: var(--radius-lg, 8px);
  padding: 24px 26px 26px;
  box-shadow: 0 1px 2px rgba(16, 16, 16, 0.04), 0 10px 30px rgba(16, 16, 16, 0.05);
}
.ch-viz-card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-tertiary, #8B8B8B);
  margin: 0 0 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-subtle, #EAEAEA);
}
.ch-viz-card__head b { color: var(--color-arch-purple); font-weight: 500; }
.ch-viz-card__foot {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--fg-tertiary, #8B8B8B);
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle, #EAEAEA);
}
.ch-viz-card__foot strong { color: var(--color-data-black); font-weight: 600; }

/* Hero · the variation ledger, and the changes that never reached it */
.ch-led { display: grid; gap: 7px; }
.ch-led__row {
  display: grid;
  grid-template-columns: 1fr 92px 76px;
  gap: 12px;
  align-items: center;
  background: var(--color-light-gray);
  border-radius: var(--radius-md, 6px);
  padding: 11px 14px;
}
.ch-led__row--head {
  background: none;
  padding: 0 14px 6px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-tertiary, #8B8B8B);
}
.ch-led__row--head span:not(:first-child) { text-align: right; }
.ch-led__row--off { background: var(--state-warning-bg); }
.ch-led__what { margin: 0; font-size: 13px; line-height: 1.4; color: var(--color-data-black); }
.ch-led__what span {
  display: block;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.06em;
  color: var(--fg-tertiary, #8B8B8B);
  margin-top: 4px;
}
.ch-led__row--off .ch-led__what span { color: var(--state-warning-fg); }
.ch-led__val {
  margin: 0;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-data-black);
}
.ch-led__state {
  margin: 0;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-arch-purple);
}
.ch-led__row--off .ch-led__val,
.ch-led__row--off .ch-led__state { color: var(--state-warning-fg); }
.ch-led__cut {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  margin: 6px 0 2px;
}
.ch-led__cut span {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--state-warning-fg);
}
.ch-led__cut i { display: block; border-top: 1.5px dashed var(--state-warning-fg); }
.ch-led__sum {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 14px;
  align-items: baseline;
  margin-top: 12px;
  padding: 13px 14px;
  border-radius: var(--radius-md, 6px);
  background: var(--purple-50);
}
.ch-led__sum p { margin: 0; font-size: 13px; color: var(--color-data-black); font-weight: 600; }
.ch-led__sum b { font-family: var(--font-mono); font-size: 15px; color: var(--color-arch-purple); }

/* ---------- 2. CURRENT PRACTICE ---------- */
.ch-split { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: center; }
.ch-list { list-style: none; margin: 22px 0 0; padding: 0; display: grid; gap: 14px; }
.ch-list li {
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 12px;
  align-items: start;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--fg-secondary);
}
.ch-list li::before {
  content: "";
  width: 7px;
  height: 7px;
  margin-top: 9px;
  border-radius: 999px;
  background: var(--color-arch-purple);
}

.ch-panel {
  background: var(--color-draft-white);
  border: 1px solid var(--border-subtle, #EAEAEA);
  border-radius: var(--radius-lg, 8px);
  padding: 26px 28px 28px;
  box-shadow: 0 1px 2px rgba(16, 16, 16, 0.04);
}
.ch-panel__label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-tertiary, #8B8B8B);
  margin: 0 0 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-subtle, #EAEAEA);
}

/* the ripple: one change, and what it set off downstream */
.ch-rip { display: grid; gap: 4px; }
.ch-rip__node {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  border-radius: var(--radius-md, 6px);
  padding: 11px 14px;
  background: var(--color-light-gray);
  font-size: 13px;
  color: var(--color-data-black);
}
.ch-rip__node--root { background: var(--purple-100, #E2E2FA); font-weight: 600; }
.ch-rip__node--break { background: var(--state-warning-bg); color: var(--state-warning-fg); font-weight: 600; }
.ch-rip__node--end {
  background: var(--color-draft-white);
  border: 1.5px dashed var(--state-warning-fg);
  color: var(--state-warning-fg);
  font-weight: 600;
}
.ch-rip__n {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  white-space: nowrap;
  color: var(--fg-tertiary, #8B8B8B);
}
.ch-rip__node--root .ch-rip__n { color: var(--color-arch-purple); }
.ch-rip__node--break .ch-rip__n,
.ch-rip__node--end .ch-rip__n { color: var(--state-warning-fg); }
.ch-rip__branch { display: grid; grid-template-columns: 22px 1fr; }
.ch-rip__branch--deep { grid-template-columns: 44px 1fr; }
.ch-rip__elbow {
  position: relative;
  border-left: 1.5px solid var(--color-lavender);
}
.ch-rip__elbow::after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 100%;
  border-top: 1.5px solid var(--color-lavender);
}
.ch-rip__branch--deep .ch-rip__elbow { border-left-color: var(--state-warning-fg); }
.ch-rip__branch--deep .ch-rip__elbow::after { border-top-color: var(--state-warning-fg); }
.ch-rip__weeks {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle, #EAEAEA);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-tertiary, #8B8B8B);
}
.ch-rip__weeks b { color: var(--state-warning-fg); font-weight: 500; }

/* ---------- 3. WITH TEKTOME · impact before commitment ---------- */
.ch-impact {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 0;
  background: var(--color-draft-white);
  border: 1px solid var(--border-subtle, #EAEAEA);
  border-radius: var(--radius-lg, 8px);
  overflow: hidden;
}
.ch-impact__side { padding: 30px 32px 32px; }
.ch-impact__side + .ch-impact__side { border-left: 1px solid var(--border-subtle, #EAEAEA); background: var(--color-light-gray); }
.ch-impact__tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-arch-purple);
}
.ch-impact__tag::before { content: ""; width: 7px; height: 7px; border-radius: 999px; background: var(--color-arch-purple); }
.ch-impact__q { margin: 0 0 20px; font-size: 19px; font-weight: 600; line-height: 1.32; color: var(--color-data-black); }
.ch-impact__q em { font-style: normal; color: var(--color-arch-purple); }

.ch-tally { display: grid; gap: 9px; }
.ch-tally__row {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 14px;
  align-items: baseline;
  padding: 12px 14px;
  border-radius: var(--radius-md, 6px);
  background: var(--color-light-gray);
}
.ch-impact__side + .ch-impact__side .ch-tally__row { background: var(--color-draft-white); }
.ch-tally__row--break { background: var(--state-warning-bg); }
.ch-impact__side + .ch-impact__side .ch-tally__row--break { background: var(--state-warning-bg); }
.ch-tally__n {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--color-arch-purple);
  text-align: right;
}
.ch-tally__row--break .ch-tally__n { color: var(--state-warning-fg); }
.ch-tally__t { margin: 0; font-size: 13.5px; line-height: 1.5; color: var(--color-data-black); }
.ch-tally__t span { display: block; color: var(--fg-tertiary, #8B8B8B); font-size: 12.5px; margin-top: 3px; }

.ch-choice { display: grid; gap: 10px; margin-top: 4px; }
.ch-choice__row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 13px 15px;
  border-radius: var(--radius-md, 6px);
  background: var(--color-draft-white);
  border: 1px solid var(--border-subtle, #EAEAEA);
  font-size: 13.5px;
  color: var(--color-data-black);
}
.ch-choice__row--go { border-color: var(--color-arch-purple); }
.ch-choice__row i {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-tertiary, #8B8B8B);
  white-space: nowrap;
}
.ch-choice__row--go i { color: var(--color-arch-purple); }
.ch-impact__note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--fg-tertiary, #8B8B8B);
}
.ch-impact__note strong { color: var(--color-data-black); font-weight: 600; }

/* ---------- 4. WHAT YOU GET ---------- */
.ch-gets { display: grid; gap: 20px; }
.ch-get {
  background: var(--color-draft-white);
  border: 1px solid var(--border-subtle, #EAEAEA);
  border-radius: var(--radius-lg, 8px);
  padding: 34px 36px;
  display: grid;
  grid-template-columns: 1fr 1.04fr;
  gap: 48px;
  align-items: center;
}
.ch-get__copy { min-width: 0; }
.ch-get__viz { min-width: 0; }
.ch-get:nth-child(even) .ch-get__copy { order: 2; }
.ch-get:nth-child(even) .ch-get__viz { order: 1; }
.ch-get__title { font-size: 20px; font-weight: 600; color: var(--color-data-black); margin: 0 0 10px; line-height: 1.3; }
.ch-get__text { font-size: 15.5px; line-height: 1.64; color: var(--fg-secondary); margin: 0; text-wrap: pretty; }
.ch-get__eg {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--fg-tertiary, #8B8B8B);
  margin: 14px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle, #EAEAEA);
}
.ch-get__eg b {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-arch-purple);
  display: block;
  margin-bottom: 6px;
}

.ch-viz { background: var(--color-light-gray); border-radius: var(--radius-lg, 8px); padding: 20px 20px 22px; }
.ch-viz__label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-tertiary, #8B8B8B);
  margin: 0 0 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--gray-300, #D9D9D9);
}

/* 1 · correspondence sweep: every channel, and the verdict on each */
.ch-sweep { display: grid; gap: 7px; }
.ch-sweep__row {
  display: grid;
  grid-template-columns: 74px 1fr auto;
  gap: 12px;
  align-items: center;
  background: var(--color-draft-white);
  border-radius: var(--radius-md, 6px);
  padding: 11px 13px;
  font-size: 12.5px;
  color: var(--color-data-black);
}
.ch-sweep__row--hit { box-shadow: inset 2px 0 0 var(--state-warning-fg); }
.ch-sweep__src {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-tertiary, #8B8B8B);
}
.ch-sweep__row--hit .ch-sweep__src { color: var(--state-warning-fg); }
.ch-sweep__what { margin: 0; line-height: 1.42; }
.ch-sweep__verdict {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--color-arch-purple);
}
.ch-sweep__row--hit .ch-sweep__verdict { color: var(--state-warning-fg); }
.ch-sweep__sum {
  margin: 12px 0 0;
  padding: 11px 13px;
  border-radius: var(--radius-md, 6px);
  background: var(--purple-50);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--color-data-black);
}

/* 2 · dependency fan: what a proposed change reaches. The bar takes the
   flexible track so every discipline measures against the same full-width
   base; the label and count are fixed. */
.ch-fan { display: grid; grid-template-columns: 1fr; gap: 12px; }
.ch-fan__from {
  padding: 12px 14px;
  border-radius: var(--radius-md, 6px);
  background: var(--purple-100, #E2E2FA);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-data-black);
}
.ch-fan__from span {
  display: block;
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 9.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-arch-purple);
  margin-bottom: 5px;
}
.ch-fan__rays { display: grid; gap: 6px; }
.ch-fan__ray {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr) 52px;
  gap: 12px;
  align-items: center;
  background: var(--color-draft-white);
  border-radius: var(--radius-md, 6px);
  padding: 10px 13px;
  font-size: 12.5px;
  color: var(--color-data-black);
}
.ch-fan__bar { display: block; height: 10px; border-radius: 2px; background: var(--color-light-gray); }
.ch-fan__bar i { display: block; height: 100%; border-radius: 2px; background: var(--color-lavender); }
.ch-fan__ray--break .ch-fan__bar i { background: var(--state-warning-fg); }
.ch-fan__ray--break { box-shadow: inset 2px 0 0 var(--state-warning-fg); }
.ch-fan__ray i.ch-fan__n {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 11px;
  text-align: right;
  color: var(--fg-tertiary, #8B8B8B);
  white-space: nowrap;
}
.ch-fan__ray--break i.ch-fan__n { color: var(--state-warning-fg); }
.ch-fan__key {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  color: var(--fg-secondary);
}
.ch-fan__key li { display: flex; align-items: center; gap: 8px; }
.ch-fan__key i { width: 14px; height: 8px; border-radius: 2px; flex: none; }

/* 3 · VE ledger: saving set against what it breaks */
.ch-ve { display: grid; gap: 8px; }
.ch-ve__row {
  display: grid;
  grid-template-columns: 1fr 78px 84px;
  gap: 12px;
  align-items: center;
  background: var(--color-draft-white);
  border-radius: var(--radius-md, 6px);
  padding: 11px 13px;
  font-size: 12.5px;
  color: var(--color-data-black);
}
.ch-ve__row--head {
  background: none;
  padding: 0 13px 6px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-tertiary, #8B8B8B);
}
.ch-ve__row--head span:not(:first-child) { text-align: right; }
.ch-ve__save { margin: 0; text-align: right; font-family: var(--font-mono); font-size: 12.5px; color: var(--color-arch-purple); }
.ch-ve__flag {
  margin: 0;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-tertiary, #8B8B8B);
}
.ch-ve__row--break { background: var(--state-warning-bg); }
.ch-ve__row--break .ch-ve__save,
.ch-ve__row--break .ch-ve__flag { color: var(--state-warning-fg); }
.ch-ve__row p { margin: 0; line-height: 1.42; }

/* 4 · drift: a settled value quietly moving back */
.ch-drift { display: grid; gap: 0; }
.ch-drift__step {
  display: grid;
  grid-template-columns: 72px 1fr auto;
  gap: 12px;
  align-items: center;
  background: var(--color-draft-white);
  border-radius: var(--radius-md, 6px);
  padding: 11px 13px;
  font-size: 12.5px;
  color: var(--color-data-black);
}
.ch-drift__step--settled { border: 1px solid var(--color-arch-purple); }
.ch-drift__step--undone { background: var(--state-warning-bg); }
.ch-drift__when {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--fg-tertiary, #8B8B8B);
}
.ch-drift__val { margin: 0; font-family: var(--font-mono); font-size: 13px; }
.ch-drift__by {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-tertiary, #8B8B8B);
  white-space: nowrap;
}
.ch-drift__step--undone .ch-drift__val,
.ch-drift__step--undone .ch-drift__by,
.ch-drift__step--undone .ch-drift__when { color: var(--state-warning-fg); }
.ch-drift__link { justify-self: center; width: 2px; height: 12px; background: var(--color-lavender); }
.ch-drift__link--break { background: var(--state-warning-fg); }
.ch-drift__sum {
  margin: 12px 0 0;
  padding: 11px 13px;
  border-radius: var(--radius-md, 6px);
  background: var(--purple-50);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--color-data-black);
}

/* 5 · the dispute bundle, assembled from the record */
.ch-bundle { display: grid; gap: 8px; }
.ch-bundle__row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 14px;
  align-items: center;
  background: var(--color-draft-white);
  border-left: 3px solid var(--color-arch-purple);
  border-radius: var(--radius-md, 6px);
  padding: 12px 14px;
  font-size: 12.5px;
  color: var(--color-data-black);
}
.ch-bundle__row i {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-tertiary, #8B8B8B);
  white-space: nowrap;
}
.ch-bundle__seal {
  margin: 12px 0 0;
  padding: 11px 14px;
  border-radius: var(--radius-md, 6px);
  background: var(--purple-50);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--color-data-black);
}

/* ---------- 5. WHERE IT LANDS ---------- */
.ch-ledger {
  background: var(--color-draft-white);
  border: 1px solid var(--border-subtle, #EAEAEA);
  border-radius: var(--radius-lg, 8px);
  overflow: hidden;
}
.ch-ledger__head,
.ch-ledger__row { display: grid; grid-template-columns: 1.15fr 1fr 1fr; gap: 28px; }
.ch-ledger__head {
  padding: 15px 28px;
  background: var(--color-light-gray);
  border-bottom: 1px solid var(--border-subtle, #EAEAEA);
}
.ch-ledger__head span {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-secondary);
}
.ch-ledger__row {
  padding: 26px 28px;
  border-bottom: 1px solid var(--border-subtle, #EAEAEA);
  font-size: 15px;
  line-height: 1.6;
  color: var(--fg-secondary);
}
.ch-ledger__row:last-child { border-bottom: 0; }
.ch-ledger__row b { display: block; color: var(--color-data-black); font-weight: 600; }
.ch-ledger__row em { font-style: normal; color: var(--color-arch-purple); font-weight: 500; }
/* the load-bearing row, matching .rc-ledger__row--key */
.ch-ledger__row--key {
  background: var(--purple-50);
  box-shadow: inset 3px 0 0 var(--color-arch-purple);
}
.ch-ledger__row--key > div:first-child b { color: var(--color-arch-purple); }

/* Sourced figures, "rule" treatment as on the sibling use-case pages. */
.ch-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 24px; }
.ch-stat {
  padding: 28px 26px 26px;
  border-radius: 0 0 var(--radius-lg, 8px) var(--radius-lg, 8px);
  background: var(--color-draft-white);
  border: 1px solid var(--border-subtle, #EAEAEA);
  border-top: 4px solid var(--viz, var(--color-arch-purple));
  box-shadow: 0 1px 2px rgba(16, 16, 16, 0.04), 0 10px 26px rgba(16, 16, 16, 0.06);
}
.ch-stat__n { font-size: 54px; font-weight: 300; letter-spacing: -0.02em; color: var(--color-arch-purple); margin: 0 0 14px; line-height: 1; }
.ch-stat__t { font-size: 15px; line-height: 1.55; color: var(--color-data-black); margin: 0 0 12px; }
.ch-stat__s {
  font-family: var(--font-mono);
  font-size: 10.5px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: var(--fg-tertiary, #8B8B8B);
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle, #EAEAEA);
}

/* ---------- 6. WHY TEKTOME ---------- */
/* Comparison as a table, matching the Risk & Review Coverage page. Our column
   keeps the white table ground with an Arch Purple edge; theirs takes the grey
   fill, so the three surfaces stay distinct whatever the section behind. */
.ch-vs { display: block; }
.ch-vs__table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-draft-white);
  border: 1px solid var(--border-subtle, #EAEAEA);
  border-radius: var(--radius-lg, 8px);
  overflow: hidden;
  table-layout: fixed;
}
.ch-vs__table th, .ch-vs__table td { text-align: left; vertical-align: top; padding: 18px 22px; }
.ch-vs__table thead th {
  background: var(--color-light-gray);
  border-bottom: 1px solid var(--border-subtle, #EAEAEA);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-secondary);
  padding-top: 15px;
  padding-bottom: 15px;
}
.ch-vs__table thead th:first-child { width: 22%; }
.ch-vs__table thead th.is-us { color: var(--color-arch-purple); }
.ch-vs__table thead th.is-us img { display: block; height: 19px; width: auto; }
.ch-vs__table tbody tr + tr th, .ch-vs__table tbody tr + tr td { border-top: 1px solid var(--border-subtle, #EAEAEA); }
.ch-vs__table tbody th {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-data-black);
}
.ch-vs__table td { font-size: 14.5px; line-height: 1.55; color: var(--fg-secondary); }
.ch-vs__table th:nth-child(2), .ch-vs__table td:nth-child(2) { background: var(--color-light-gray); }
.ch-vs__table .is-us { background: var(--color-draft-white); box-shadow: inset 3px 0 0 var(--color-arch-purple); }
.ch-vs__table td.is-us { color: var(--color-data-black); }
.ch-vs__cell { display: grid; grid-template-columns: 17px minmax(0, 1fr); gap: 11px; align-items: start; }
/* --gray-400 is 1.35:1 on the grey cell ground, under the 3:1 floor */
.ch-vs__cell svg { width: 15px; height: 15px; margin-top: 3px; color: var(--fg-tertiary, #8B8B8B); }
.ch-vs__cell--us svg { color: var(--color-arch-purple); }

@media (max-width: 900px) {
  .ch-vs__table thead th:first-child { width: auto; }
  .ch-vs__table th, .ch-vs__table td { padding: 13px 14px; }
}
/* below 700px three columns starve the text box, so the rows stack */
@media (max-width: 700px) {
  .ch-vs__table, .ch-vs__table tbody, .ch-vs__table tr, .ch-vs__table th, .ch-vs__table td { display: block; }
  .ch-vs__table thead { display: none; }
  .ch-vs__table tbody tr { padding: 4px 0 14px; }
  .ch-vs__table tbody tr + tr { border-top: 1px solid var(--border-subtle, #EAEAEA); }
  .ch-vs__table tbody tr + tr th, .ch-vs__table tbody tr + tr td { border-top: 0; }
  .ch-vs__table tbody th { padding-bottom: 10px; }
  .ch-vs__table td { margin: 0 14px 8px; padding: 12px 14px; border-radius: var(--radius-md, 6px); }
  .ch-vs__table td:last-child { margin-bottom: 0; }
  .ch-vs__table td::before {
    content: "A change log";
    display: block;
    margin-bottom: 7px;
    font-family: var(--font-mono);
    font-size: 9.5px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--fg-secondary);
  }
  .ch-vs__table td.is-us::before { content: "Tektome"; color: var(--color-arch-purple); }
}

/* ---------- 7. WHO IT'S FOR ---------- */
/* Executive first, per the marketing foundation: the consequence leads, the
   roles sit underneath, and each carries its buying role so a Champion never
   reads as a peer of the Budget owner. The daily user is deliberately last
   and smallest, so the section cannot drift back to productivity. */
.ch-roles__lede { max-width: 74ch; margin: 0 0 34px; font-size: 16.5px; line-height: 1.7; color: var(--fg-secondary); }
.ch-roles__lede strong { color: var(--color-data-black); font-weight: 600; }

.ch-role__buy {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin: 0 0 14px;
  padding: 4px 11px 4px 9px;
  border-radius: 999px;
  background: var(--purple-50);
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-arch-purple);
}
.ch-role__buy::before { content: ""; width: 6px; height: 6px; border-radius: 999px; background: var(--color-arch-purple); flex: none; }
.ch-role__who em {
  display: block;
  margin-top: 6px;
  font-style: normal;
  font-family: var(--font-sans);
  font-size: 12.5px;
  letter-spacing: 0;
  text-transform: none;
  color: var(--fg-tertiary, #8B8B8B);
  line-height: 1.45;
}

/* Card backgrounds. The four architecture images sit behind a white veil so
   body copy keeps its contrast; the image reads as texture, not subject. */
.ch-role {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background-color: var(--color-draft-white);
  background-image: var(--card-img);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
.ch-role::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.684) 100%);
}
.ch-role[data-card="1"] { --card-img: url("../backgrounds/card-facade-curve-card.png"); }
.ch-role[data-card="2"] { --card-img: url("../backgrounds/card-apex-card.png"); }
.ch-role[data-card="3"] { --card-img: url("../backgrounds/card-corridor-card.png"); }
.ch-role[data-card="4"] { --card-img: url("../backgrounds/card-lattice-card.png"); }
/* the table layout has no card surface, so no image behind it */
.ch-roles[data-layout="table"] .ch-role::before { display: none; }
.ch-roles[data-layout="table"] .ch-role { background-image: none; }

.ch-roles[data-layout="ladder"] { grid-template-columns: repeat(3, 1fr); }
.ch-roles[data-layout="ladder"] .ch-role:first-child { grid-column: 1 / -1; }
.ch-roles[data-layout="ladder"] .ch-role:first-child .ch-role__t { font-size: 22px; }
.ch-roles[data-layout="ladder"] .ch-role:first-child .ch-role__x { max-width: 62ch; }

.ch-roles[data-layout="tiers"] { grid-template-columns: repeat(2, 1fr); counter-reset: tier; }
.ch-roles[data-layout="tiers"] .ch-role { counter-increment: tier; }
.ch-roles[data-layout="tiers"] .ch-role__buy::before {
  content: counter(tier, decimal-leading-zero);
  width: auto;
  height: auto;
  border-radius: 0;
  background: none;
  color: var(--color-arch-purple);
}

.ch-roles[data-layout="table"] { gap: 0; }
.ch-roles[data-layout="table"] .ch-role {
  display: grid;
  grid-template-columns: 168px 232px minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  background: none;
  border: 0;
  border-top: 1px solid var(--border-subtle, #EAEAEA);
  border-radius: 0;
  padding: 26px 4px;
}
.ch-roles[data-layout="table"] .ch-role:last-child { border-bottom: 1px solid var(--border-subtle, #EAEAEA); }
.ch-roles[data-layout="table"] .ch-role__buy,
.ch-roles[data-layout="table"] .ch-role__who,
.ch-roles[data-layout="table"] .ch-role__t { margin: 0; }
.ch-roles[data-layout="table"] .ch-role__who { grid-column: 2; margin-bottom: 8px; }
.ch-roles[data-layout="table"] .ch-role__t { grid-column: 2; font-size: 15px; }
.ch-roles[data-layout="table"] .ch-role__x { grid-column: 3; }

.ch-roles__foot {
  display: grid;
  grid-template-columns: 168px minmax(0, 1fr);
  gap: 28px;
  align-items: baseline;
  margin-top: 20px;
  padding-top: 22px;
  border-top: 1px solid var(--border-subtle, #EAEAEA);
}
.ch-roles__foot-buy {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-tertiary, #8B8B8B);
}
.ch-roles__foot-x { margin: 0; font-size: 14px; line-height: 1.6; color: var(--fg-secondary); max-width: 78ch; }
.ch-roles__foot-x strong { color: var(--color-data-black); font-weight: 600; }

.ch-roles { display: grid; gap: 20px; }
.ch-role {
  background-color: var(--color-draft-white);
  border: 1px solid var(--border-subtle, #EAEAEA);
  border-radius: var(--radius-lg, 8px);
  padding: 26px 24px 28px;
}
.ch-role__who {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-arch-purple);
  margin: 0 0 14px;
  line-height: 1.5;
}
.ch-role__t { font-size: 16px; font-weight: 600; color: var(--color-data-black); margin: 0 0 10px; line-height: 1.35; }
.ch-role__x { font-size: 14px; line-height: 1.6; color: var(--fg-secondary); margin: 0; text-wrap: pretty; }

/* ---------- responsive ---------- */
@media (max-width: 1080px) {
  .ch-roles[data-layout="ladder"], .ch-roles[data-layout="tiers"] { grid-template-columns: repeat(2, 1fr); }
  .ch-stats { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  .ch-hero { padding: 60px 0 52px; }
  .ch-sec { padding: 68px 0; }
  .ch-inner, .ch-hero__inner { padding: 0 24px; }
  .ch-hero__inner { grid-template-columns: 1fr; gap: 36px; }
  .ch-split { grid-template-columns: 1fr; gap: 40px; }
  .ch-vs { grid-template-columns: 1fr; }
  .ch-ledger__head { display: none; }
  .ch-ledger__row { grid-template-columns: 1fr; gap: 16px; padding: 24px; }
  .ch-impact { grid-template-columns: 1fr; }
  .ch-impact__side + .ch-impact__side { border-left: 0; border-top: 1px solid var(--border-subtle, #EAEAEA); }
  .ch-get { grid-template-columns: 1fr; gap: 26px; padding: 26px; }
  .ch-get:nth-child(even) .ch-get__copy { order: 0; }
  .ch-get:nth-child(even) .ch-get__viz { order: 0; }
}
@media (max-width: 560px) {
  .ch-roles[data-layout="ladder"], .ch-roles[data-layout="tiers"] { grid-template-columns: 1fr; }
  .ch-roles[data-layout="table"] .ch-role { grid-template-columns: 1fr; gap: 10px; }
  .ch-roles[data-layout="table"] .ch-role__who,
  .ch-roles[data-layout="table"] .ch-role__t,
  .ch-roles[data-layout="table"] .ch-role__x { grid-column: 1; }
  .ch-roles__foot { grid-template-columns: 1fr; gap: 10px; }
  .ch-led__row { grid-template-columns: 1fr auto; }
  .ch-led__state { grid-column: 1 / -1; text-align: left; }
  .ch-ve__row { grid-template-columns: 1fr auto; }
  .ch-ve__flag { grid-column: 1 / -1; text-align: left; }
  .ch-fan__ray { grid-template-columns: 74px minmax(0, 1fr) 44px; gap: 8px; }
}