/* ModelWeave site styles (modelweave.co). Shared by index.html and case-study.html.
   Layout: navy bands (hero, closing band, footer) frame light working sections; content on a 1120px grid.
   Colours come from the MW logo: navy #0b2a4a, blue #0e5aa7, greens #0e9f76 / #16b58a, dark-logo greens. */

@font-face { font-family: "Poppins"; font-weight: 500; font-style: normal; font-display: swap; src: url("fonts/poppins-500.woff2") format("woff2"); }
@font-face { font-family: "Poppins"; font-weight: 600; font-style: normal; font-display: swap; src: url("fonts/poppins-600.woff2") format("woff2"); }
@font-face { font-family: "Poppins"; font-weight: 700; font-style: normal; font-display: swap; src: url("fonts/poppins-700.woff2") format("woff2"); }

:root {
  /* brand */
  --navy: #0b2a4a;
  --navy-deep: #08213b;
  --blue: #0e5aa7;
  --green: #16b58a;
  --green-ink: #0b7a5b;      /* green for text on light backgrounds */
  --on-navy: #ffffff;
  --on-navy-muted: #b7c6d6;
  --navy-green: #3ddc97;     /* greens and blues from the dark-background logo */
  --navy-blue: #5cb3f2;
  --navy-line: rgba(183, 198, 214, 0.22);

  /* page */
  --bg: #f4f7fa;
  --surface: #ffffff;
  --surface-2: #eaf0f5;
  --text: #0b2a4a;
  --muted: #4d6074;
  --line: #d9e2ea;
  --accent: var(--green-ink);
  --link: #0e5aa7;
  --btn-bg: #16b58a;
  --btn-text: #0b2a4a;
  --btn-hover: #12a37c;
  --chip-on-bg: #0b2a4a;
  --chip-on-text: #ffffff;
  --tint-green: #e3f5ee;
  --tint-blue: #e4eef9;
  --tint-amber: #fbf1dc;
  --amber-ink: #8a5a00;
  --tint-grey: #edf1f5;
  --warn: #b4232c;
  --hatch: rgba(11, 42, 74, 0.32);
  --clean: #d9434b;
  --hero-bg: #e6f4ee;
  --hero-bg-2: #edf3f9;

  --font-display: "Poppins", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-data: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --step--1: 0.875rem;
  --step-0: 1rem;
  --step-1: 1.125rem;
  --step-2: 1.375rem;
  --step-3: clamp(1.6rem, 1.2rem + 1.6vw, 2.25rem);
  --step-4: clamp(2.1rem, 1.4rem + 3vw, 3.5rem);

  --radius: 10px;
  --wrap: 1120px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --navy: #0b2a4a; --navy-deep: #061729;
    --bg: #081a2d; --surface: #0e2540; --surface-2: #12304f; --text: #e6eef5; --muted: #9fb2c6;
    --line: #1d3a5a; --accent: #3ddc97; --link: #5cb3f2;
    --btn-bg: #3ddc97; --btn-text: #0b2a4a; --btn-hover: #5fe6ab;
    --chip-on-bg: #3ddc97; --chip-on-text: #0b2a4a;
    --tint-green: #0f3a36; --tint-blue: #10335a; --tint-amber: #3a2f14; --amber-ink: #f0c060; --tint-grey: #132c48;
    --warn: #ff7b84; --hatch: rgba(230, 238, 245, 0.45); --clean: #ff9aa2; --hero-bg: #0b2a4a; --hero-bg-2: #0b2a4a;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --navy: #0b2a4a; --navy-deep: #061729;
  --bg: #081a2d; --surface: #0e2540; --surface-2: #12304f; --text: #e6eef5; --muted: #9fb2c6;
  --line: #1d3a5a; --accent: #3ddc97; --link: #5cb3f2;
  --btn-bg: #3ddc97; --btn-text: #0b2a4a; --btn-hover: #5fe6ab;
  --chip-on-bg: #3ddc97; --chip-on-text: #0b2a4a;
  --tint-green: #0f3a36; --tint-blue: #10335a; --tint-amber: #3a2f14; --amber-ink: #f0c060; --tint-grey: #132c48;
  --warn: #ff7b84; --hatch: rgba(230, 238, 245, 0.45); --clean: #ff9aa2; --hero-bg: #0b2a4a; --hero-bg-2: #0b2a4a;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition: none !important; animation: none !important; } }
body { margin: 0; background: var(--bg); color: var(--text); font: 400 var(--step-0)/1.6 var(--font-body); }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--link); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--navy-blue); outline-offset: 2px; border-radius: 4px; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.2; margin: 0; text-wrap: balance; letter-spacing: -0.01em; }
p { margin: 0; }
.num { font-variant-numeric: tabular-nums; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--btn-bg); color: var(--btn-text); padding: 8px 12px; border-radius: 6px; z-index: 20; }
.skip:focus { left: 16px; }

.wrap {
  max-width: calc(var(--wrap) + 2 * 24px);
  margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
@media (min-width: 720px) { .wrap { padding-left: max(24px, env(safe-area-inset-left, 0px)); padding-right: max(24px, env(safe-area-inset-right, 0px)); } }

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 10px 20px;
  border-radius: 8px; border: 1px solid transparent; text-decoration: none; cursor: pointer;
  font: 600 var(--step-0)/1.2 var(--font-display); background: var(--btn-bg); color: var(--btn-text);
  transition: background-color .15s ease, transform .15s ease;
}
.btn:hover { background: var(--btn-hover); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn.ghost { background: transparent; color: var(--on-navy); border-color: var(--navy-line); }
.btn.ghost:hover { background: rgba(255, 255, 255, 0.08); }
.btn.quiet { background: transparent; color: var(--text); border-color: var(--line); }
.btn.quiet:hover { background: var(--surface-2); }

/* navy band: header, hero, closing band, footer */
.band { background: var(--navy); color: var(--on-navy); }
.band a:not(.btn) { color: var(--on-navy); }
/* light band: pale tint in light mode, navy in dark mode; reuses the band tokens */
.band.light {
  background: linear-gradient(180deg, var(--hero-bg), var(--hero-bg-2)); color: var(--text);
  --on-navy: var(--text); --on-navy-muted: var(--muted); --navy-green: var(--accent); --navy-blue: var(--link);
  --navy-line: var(--line); --navy-deep: var(--surface);
}
.band.light .btn.ghost:hover { background: var(--surface-2); }
.band.light .lbl.on-navy.measured { background: var(--tint-blue); color: var(--link); }
.band.light .lbl.on-navy.illus { background: var(--tint-amber); color: var(--amber-ink); }
.band.light .runs { box-shadow: 0 1px 2px rgba(11, 42, 74, 0.05), 0 12px 32px rgba(11, 42, 74, 0.07); }
.site-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 18px; }
.site-head .logo img { width: 190px; }
.site-nav { display: flex; align-items: center; gap: 22px; font: 500 var(--step--1)/1 var(--font-display); }
.site-nav a:not(.btn) { text-decoration: none; color: var(--on-navy-muted); }
.site-nav a:not(.btn):hover { color: var(--on-navy); }
.site-nav .btn { min-height: 40px; padding: 8px 16px; font-size: var(--step--1); }
@media (max-width: 860px) { .site-nav .hide-sm { display: none; } }
@media (max-width: 420px) { .site-head .logo img { width: 150px; } .site-nav { gap: 14px; } }

.eyebrow { font: 600 0.75rem/1.3 var(--font-display); letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); }
.band .eyebrow { color: var(--navy-green); }

/* hero */
.hero { padding-block: 40px 72px; display: grid; gap: 48px; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); align-items: center; }
@media (max-width: 900px) { .hero { grid-template-columns: minmax(0, 1fr); padding-block: 24px 56px; gap: 40px; } }
.hero h1 { font-size: var(--step-4); font-weight: 700; line-height: 1.08; margin-top: 14px; letter-spacing: -0.02em; }
.hero h1 .hl { color: var(--navy-green); }
.hero .lead { font-size: var(--step-1); color: var(--on-navy-muted); margin-top: 20px; max-width: 58ch; }
.hero .lead-invest { margin-top: 14px; padding-left: 14px; border-left: 3px solid var(--btn-bg); color: var(--on-navy); }
.hero .actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero .fine { margin-top: 18px; font-size: var(--step--1); color: var(--on-navy-muted); }

/* hero figure: two run orders at the bottleneck station */
.runs { background: var(--navy-deep); border: 1px solid var(--navy-line); border-radius: 14px; padding: 22px; min-width: 0; }
.runs-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.runs-head h2 { font-size: var(--step-0); font-weight: 600; }
.tag { display: inline-block; font: 600 0.6875rem/1 var(--font-display); letter-spacing: 0.08em; text-transform: uppercase; padding: 5px 8px; border-radius: 999px; border: 1px solid currentColor; }
.band .tag { color: var(--on-navy-muted); }
.run { margin-top: 18px; }
.run-label { display: flex; justify-content: space-between; gap: 8px; font-size: var(--step--1); color: var(--on-navy-muted); margin-bottom: 8px; }
.run-label strong { color: var(--on-navy); font-weight: 600; }
.strip { display: flex; height: 34px; border-radius: 6px; overflow: hidden; gap: 2px; background: var(--surface-2); }
.strip span { display: block; height: 100%; }
.strip .co, .runs-key .k-co { background: repeating-linear-gradient(135deg, var(--hatch) 0 3px, transparent 3px 7px); }
.strip .co.full, .runs-key .k-full { background: repeating-linear-gradient(135deg, var(--clean) 0 3px, transparent 3px 7px); }
.strip .back, .runs-key .k-back { border: 1px dashed var(--accent); border-radius: 4px; background: transparent; }
.p1 { background: #3ddc97; } .p2 { background: #5cb3f2; } .p3 { background: #f2c14e; } .p4 { background: #e9836b; } .p5 { background: #b49cf0; }
.runs-key { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-top: 16px; font-size: 0.8125rem; color: var(--on-navy-muted); }
.runs-key i { display: inline-block; width: 18px; height: 12px; border-radius: 3px; vertical-align: -1px; margin-right: 6px; }
.runs-note { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--navy-line); font-size: var(--step--1); color: var(--on-navy-muted); }
.runs-note strong { color: var(--navy-green); font-weight: 600; }

/* sections */
.section { padding-block: 80px; }
.section + .section { border-top: 1px solid var(--line); }
@media (max-width: 720px) { .section { padding-block: 56px; } }
.sec-head { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 24px; margin-bottom: 40px; }
.sec-head .no { font: 600 var(--step--1)/1.9 var(--font-display); color: var(--accent); border-top: 2px solid currentColor; padding-top: 8px; align-self: start; }
.sec-head h2 { font-size: var(--step-3); }
.sec-head p { color: var(--muted); margin-top: 12px; max-width: 64ch; font-size: var(--step-1); }
@media (max-width: 720px) { .sec-head { grid-template-columns: minmax(0, 1fr); gap: 12px; } .sec-head .no { width: 56px; } }

/* where the money goes */
.money { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
@media (max-width: 1000px) { .money { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .money { grid-template-columns: minmax(0, 1fr); } }
.leak { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; display: flex; flex-direction: column; gap: 10px; }
.leak .where { font: 600 0.75rem/1.3 var(--font-display); letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.leak h3 { font-size: var(--step-1); }
.leak p { color: var(--muted); font-size: 0.9375rem; }
.leak .fix { margin-top: auto; padding-top: 12px; border-top: 1px solid var(--line); font-size: var(--step--1); color: var(--text); }
.leak .fix b { color: var(--accent); font-weight: 600; }

/* module builder */
.builder { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 24px; align-items: start; }
@media (max-width: 960px) { .builder { grid-template-columns: minmax(0, 1fr); } }
.step-title { font: 600 var(--step--1)/1.3 var(--font-display); color: var(--muted); margin-bottom: 12px; display: flex; gap: 10px; align-items: center; }
.step-title .n { display: inline-grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; background: var(--chip-on-bg); color: var(--chip-on-text); font-size: 0.75rem; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 28px; }
.chip {
  font: 500 0.9375rem/1.2 var(--font-body); padding: 10px 14px; min-height: 44px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--line); background: var(--surface); color: var(--text); transition: background-color .15s ease, border-color .15s ease;
}
.chip:hover { border-color: var(--muted); }
.chip[aria-pressed="true"] { background: var(--chip-on-bg); color: var(--chip-on-text); border-color: var(--chip-on-bg); }
.chip[aria-pressed="true"]::before { content: "\2713\00a0"; }
.mods { display: grid; gap: 10px; }
.mod { position: relative; display: grid; grid-template-columns: 28px minmax(0, 1fr); gap: 12px; padding: 16px 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); cursor: pointer; transition: border-color .15s ease, box-shadow .15s ease; }
.mod:hover { border-color: var(--muted); }
.mod input { width: 22px; height: 22px; margin: 2px 0 0; accent-color: var(--btn-bg); cursor: pointer; }
.mod:has(input:checked) { border-color: var(--btn-bg); box-shadow: 0 0 0 1px var(--btn-bg); }
.mod-name { display: block; font: 600 var(--step-1)/1.25 var(--font-display); }
.mod-desc { display: block; color: var(--muted); font-size: 0.9375rem; margin-top: 4px; }
.mod .why { display: block; margin-top: 8px; font-size: var(--step--1); color: var(--accent); font-weight: 600; }

.out { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; min-width: 0; }
.out-head { padding: 20px 22px; border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; align-items: baseline; }
.out-head h3 { font-size: var(--step-1); }
.out-head .mode { font-size: var(--step--1); color: var(--muted); }
.out-cols { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
@media (max-width: 560px) { .out-cols { grid-template-columns: minmax(0, 1fr); } }
.out-col { padding: 18px 22px; min-width: 0; }
.out-col + .out-col { border-left: 1px solid var(--line); }
@media (max-width: 560px) { .out-col + .out-col { border-left: 0; border-top: 1px solid var(--line); } }
.out-col h4 { font: 600 0.75rem/1.3 var(--font-display); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.out-col ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 7px; font-size: 0.9375rem; }
.out-col li { padding-left: 18px; position: relative; }
.out-col li::before { content: ""; position: absolute; left: 0; top: 0.62em; width: 8px; height: 2px; background: var(--accent); }
.out-col li .opt { color: var(--muted); }
.result { margin: 0 22px 20px; padding: 16px 18px; border-radius: var(--radius); background: var(--surface-2); }
.result-top { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; align-items: baseline; margin-bottom: 10px; }
.result-top strong { font: 600 var(--step-0)/1.3 var(--font-display); }
.result table { width: 100%; border-collapse: collapse; font-size: 0.9375rem; font-variant-numeric: tabular-nums; }
.result th, .result td { text-align: left; padding: 7px 0; border-top: 1px solid var(--line); vertical-align: top; }
.result th { font-weight: 500; color: var(--muted); padding-right: 12px; }
.result td { text-align: right; white-space: nowrap; padding-left: 8px; }
.result .total td, .result .total th { font-weight: 700; color: var(--text); }
.result .src { font-size: 0.8125rem; color: var(--muted); margin-top: 10px; }
.out-foot { padding: 18px 22px 22px; border-top: 1px solid var(--line); display: grid; gap: 10px; }
.out-foot .alt { font-size: var(--step--1); color: var(--muted); }
.out-foot .alt span { font-family: var(--font-data); color: var(--text); user-select: all; }
.empty { padding: 28px 22px; color: var(--muted); }

/* labels used on figures */
.lbl { display: inline-block; font: 600 0.6875rem/1 var(--font-display); letter-spacing: 0.08em; text-transform: uppercase; padding: 5px 8px; border-radius: 999px; white-space: nowrap; }
.lbl.proven { background: var(--tint-green); color: var(--accent); }
.lbl.measured { background: var(--tint-blue); color: var(--link); }
.lbl.tested { background: var(--tint-grey); color: var(--text); }
.lbl.unknown { background: var(--tint-amber); color: var(--amber-ink); }
.lbl.default { background: transparent; color: var(--muted); border: 1px solid var(--line); }
.lbl.illus { background: var(--tint-amber); color: var(--amber-ink); }

/* how it works */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 0; counter-reset: s; }
@media (max-width: 1000px) { .steps { grid-template-columns: minmax(0, 1fr); } }
.steps li { counter-increment: s; padding: 4px 22px 4px 0; position: relative; }
.steps li::before { content: counter(s); display: grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; border: 2px solid var(--accent); color: var(--accent); font: 600 var(--step-0)/1 var(--font-display); background: var(--bg); position: relative; z-index: 1; }
.steps li::after { content: ""; position: absolute; top: 22px; left: 36px; right: 0; height: 2px; background: var(--line); }
.steps li:last-child::after { display: none; }
.steps h3 { font-size: var(--step-1); margin-top: 14px; }
.steps p { color: var(--muted); font-size: 0.9375rem; margin-top: 6px; }
@media (max-width: 1000px) {
  .steps li { padding: 0 0 28px 56px; }
  .steps li::before { position: absolute; left: 0; top: 0; }
  .steps li::after { top: 36px; bottom: 0; left: 17px; right: auto; width: 2px; height: auto; }
  .steps h3 { margin-top: 4px; }
}

.roadmap { margin-top: 36px; padding: 20px 22px; border: 1px dashed var(--line); border-radius: var(--radius); background: var(--surface); display: grid; gap: 12px; }
.roadmap h3 { font-size: inherit; }
.tag-road { display: inline-block; font: 600 0.6875rem/1 var(--font-display); letter-spacing: 0.08em; text-transform: uppercase; padding: 5px 8px; border-radius: 999px; background: var(--tint-blue); color: var(--link); }
.roadmap ul { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
@media (max-width: 900px) { .roadmap ul { grid-template-columns: minmax(0, 1fr); gap: 12px; } }
.roadmap li { font-size: 0.9375rem; color: var(--muted); min-width: 0; }
.roadmap li b { display: block; color: var(--text); font-weight: 600; margin-bottom: 4px; }

/* why mathematics */
.compare { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
@media (max-width: 900px) { .compare { grid-template-columns: minmax(0, 1fr); } }
.way { border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; background: var(--surface); }
.way.ours { background: var(--navy); color: var(--on-navy); border-color: var(--navy); }
.way.ours p, .way.ours li { color: var(--on-navy-muted); }
.way.ours .eyebrow { color: var(--navy-green); }
.way h3 { font-size: var(--step-1); margin-top: 8px; }
.way .eyebrow { color: var(--muted); }
.way p { color: var(--muted); margin-top: 8px; font-size: 0.9375rem; }
.way ul { margin: 14px 0 0; padding-left: 18px; display: grid; gap: 6px; font-size: 0.9375rem; color: var(--muted); }

.toc-strip { margin-top: 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); padding: 24px; display: grid; gap: 20px; }
.toc-strip-head h3 { font-size: var(--step-2); margin-top: 6px; }
.toc-strip-cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
@media (max-width: 900px) { .toc-strip-cols { grid-template-columns: minmax(0, 1fr); gap: 18px; } }
.toc-strip-cols > div { border-top: 2px solid var(--btn-bg); padding-top: 12px; min-width: 0; }
.toc-strip-cols h4 { font: 600 var(--step-0)/1.3 var(--font-display); margin-bottom: 8px; }
.toc-strip-cols p { font-size: 0.9375rem; color: var(--muted); }
/* five focusing steps: a row of chevrons, stacked on phones */
.steps5 { margin: 0; display: grid; gap: 10px; }
.steps5 figcaption { font: 600 0.75rem/1.3 var(--font-display); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.steps5 ol { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 6px; counter-reset: s5; }
.steps5 li { counter-increment: s5; position: relative; background: var(--tint-green); padding: 12px 22px 12px 16px; display: grid; gap: 2px; min-width: 0;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 50%, calc(100% - 12px) 100%, 0 100%, 12px 50%); }
.steps5 li:first-child { clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 50%, calc(100% - 12px) 100%, 0 100%); border-radius: 6px 0 0 6px; }
.steps5 li:nth-child(n+2) { padding-left: 24px; }
.steps5 li b { font: 600 var(--step-0)/1.2 var(--font-display); color: var(--text); }
.steps5 li b::before { content: counter(s5) " "; color: var(--accent); }
.steps5 li span { font-size: 0.8125rem; color: var(--muted); line-height: 1.35; }
.steps5-loop { justify-self: end; font-size: 0.8125rem; color: var(--accent); font-weight: 600; }
@media (max-width: 900px) {
  .steps5 ol { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .steps5 li, .steps5 li:first-child, .steps5 li:nth-child(n+2) { clip-path: none; border-radius: 6px; padding: 10px 14px; grid-template-columns: 136px minmax(0, 1fr); column-gap: 8px; align-items: baseline; }
  .steps5-loop { justify-self: start; }
}

.toc-strip-foot { padding-top: 16px; border-top: 1px solid var(--line); font-size: 0.9375rem; color: var(--text); max-width: 90ch; }

/* labels section */
.labels { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; }
@media (max-width: 1000px) { .labels { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 520px) { .labels { grid-template-columns: minmax(0, 1fr); } }
.label-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; background: var(--surface); }
.label-card p { color: var(--muted); font-size: 0.9375rem; margin-top: 10px; }
.label-card q { display: block; margin-top: 10px; font-size: var(--step--1); color: var(--text); quotes: none; border-left: 2px solid var(--line); padding-left: 10px; }
.labels-note { margin-top: 20px; color: var(--muted); max-width: 70ch; }

/* case study teaser */
.teaser { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 32px; align-items: center; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 32px; }
@media (max-width: 860px) { .teaser { grid-template-columns: minmax(0, 1fr); padding: 22px; } }
.teaser h2 { font-size: var(--step-3); margin-top: 10px; }
.teaser p { color: var(--muted); margin-top: 12px; }
.teaser .btn { margin-top: 20px; }
.pnl-mini { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; font-size: 0.9375rem; }
.pnl-mini caption { text-align: left; font: 600 0.75rem/1.3 var(--font-display); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); padding-bottom: 8px; }
.pnl-mini th, .pnl-mini td { padding: 8px 0; border-top: 1px solid var(--line); text-align: left; }
.pnl-mini td { text-align: right; white-space: nowrap; padding-left: 12px; }
.pnl-mini th { font-weight: 400; color: var(--muted); }
.pnl-mini tr.total th, .pnl-mini tr.total td { font-weight: 700; color: var(--text); border-top: 2px solid var(--text); }

/* trust and trial */
.trust { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)) minmax(0, 1.3fr); gap: 16px; }
@media (max-width: 1000px) { .trust { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .trust { grid-template-columns: minmax(0, 1fr); } }
.trust > div { padding: 20px 0; border-top: 2px solid var(--text); }
.trust h3 { font-size: var(--step-0); }
.trust p { color: var(--muted); font-size: 0.9375rem; margin-top: 6px; }
.trust .trial { border-top-color: var(--btn-bg); }
.trust .trial dl { margin: 10px 0 0; display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 4px 14px; font-size: 0.9375rem; }
.trust .trial dt { font-weight: 600; font-variant-numeric: tabular-nums; }
.trust .trial dd { margin: 0; color: var(--muted); }

/* closing band */
.close { padding-block: 72px; display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: 32px; align-items: center; }
@media (max-width: 860px) { .close { grid-template-columns: minmax(0, 1fr); padding-block: 56px; } }
.close h2 { font-size: var(--step-3); }
.close p { color: var(--on-navy-muted); margin-top: 12px; max-width: 56ch; }
.close .side { display: grid; gap: 12px; justify-items: start; }
.close .addr { font-size: var(--step--1); color: var(--on-navy-muted); }
.close .addr span { font-family: var(--font-data); color: var(--on-navy); user-select: all; overflow-wrap: anywhere; }
.site-foot { border-top: 1px solid var(--navy-line); padding-block: 24px 40px; display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; align-items: center; font-size: var(--step--1); color: var(--on-navy-muted); }
.site-foot img { width: 140px; }
.site-foot nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.site-foot .foot-contact { display: grid; gap: 2px; }
.site-foot .foot-contact h2 { font: 600 0.6875rem/1.3 var(--font-display); letter-spacing: 0.1em; text-transform: uppercase; color: var(--on-navy-muted); }
.site-foot .foot-contact a { font-weight: 600; color: var(--on-navy); }
.site-foot .foot-note { flex-basis: 100%; max-width: 80ch; font-size: 0.8125rem; color: var(--on-navy-muted); }

/* invitation form (closing band) */
.invite-form { display: grid; gap: 14px; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 22px; min-width: 0; }
.field { display: grid; gap: 6px; }
.field label { font: 600 var(--step--1)/1.3 var(--font-display); color: var(--text); }
.field .opt { font-weight: 400; color: var(--muted); }
.field input { font: 400 var(--step-0)/1.3 var(--font-body); color: var(--text); background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 11px 12px; min-height: 44px; width: 100%; }
.field input:focus-visible { outline: 3px solid var(--navy-blue); outline-offset: 1px; border-color: var(--link); }
.field input[aria-invalid="true"] { border-color: var(--warn); }
.field small { font-size: 0.8125rem; color: var(--muted); }
.invite-form .picked { font-size: var(--step--1); color: var(--muted); }
.invite-form .picked b { color: var(--text); font-weight: 600; }
.invite-form .btn { justify-self: start; }
.form-error { color: var(--warn); font-size: var(--step--1); font-weight: 600; }
.form-ok { color: var(--accent); font-size: var(--step--1); font-weight: 600; }

/* case study article */
.cs-hero { padding-block: 32px 56px; max-width: 820px; }
.cs-hero h1 { font-size: var(--step-4); font-weight: 700; line-height: 1.1; margin-top: 14px; letter-spacing: -0.02em; }
.cs-hero .lead { font-size: var(--step-1); color: var(--on-navy-muted); margin-top: 18px; max-width: 62ch; }
.fiction { display: flex; gap: 12px; align-items: flex-start; margin-top: 24px; padding: 14px 16px; border-radius: var(--radius); background: rgba(242, 193, 78, 0.12); border: 1px solid rgba(242, 193, 78, 0.45); color: var(--on-navy); font-size: var(--step--1); max-width: 70ch; }
.fiction b { color: var(--amber-ink); }
.article { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 56px; padding-block: 56px 80px; }
@media (max-width: 960px) { .article { grid-template-columns: minmax(0, 1fr); gap: 24px; padding-block: 40px 56px; } }
.toc { position: sticky; top: 24px; align-self: start; font-size: var(--step--1); }
.toc h2 { font: 600 0.75rem/1.3 var(--font-display); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.toc ol { margin: 0; padding-left: 18px; display: grid; gap: 6px; color: var(--muted); }
.toc a { color: var(--text); text-decoration: none; }
.toc a:hover { color: var(--link); text-decoration: underline; }
@media (max-width: 960px) { .toc { position: static; border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; background: var(--surface); } }
.prose { max-width: 68ch; min-width: 0; }
.prose h2 { font-size: var(--step-3); margin-top: 56px; scroll-margin-top: 16px; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: var(--step-2); margin-top: 32px; }
.prose p, .prose ul, .prose ol { margin-top: 16px; font-size: 1.0625rem; line-height: 1.7; }
.prose li + li { margin-top: 6px; }
.prose blockquote { margin: 24px 0 0; padding: 4px 0 4px 20px; border-left: 3px solid var(--btn-bg); font-size: var(--step-1); line-height: 1.55; }
.prose blockquote p { margin: 0; font-size: inherit; }
.prose blockquote cite { display: block; margin-top: 8px; font-style: normal; font-size: var(--step--1); color: var(--muted); }
.prose .note { margin-top: 20px; padding: 14px 16px; border-radius: var(--radius); background: var(--surface-2); font-size: 0.9375rem; color: var(--muted); }
.prose .note b { color: var(--text); }
.tbl { margin-top: 20px; overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.tbl table { width: 100%; border-collapse: collapse; font-size: 0.9375rem; font-variant-numeric: tabular-nums; min-width: 520px; }
.tbl caption { text-align: left; padding: 14px 16px 4px; font: 600 var(--step--1)/1.3 var(--font-display); color: var(--text); }
.tbl th, .tbl td { padding: 10px 16px; text-align: left; border-top: 1px solid var(--line); vertical-align: top; }
.tbl thead th { font: 600 0.75rem/1.3 var(--font-display); letter-spacing: 0.04em; text-transform: uppercase; color: var(--muted); border-top: 0; }
.tbl td.r, .tbl th.r { text-align: right; white-space: nowrap; }
.tbl tr.sum td, .tbl tr.sum th { font-weight: 700; border-top: 2px solid var(--text); }
.tbl .src { font-size: 0.8125rem; color: var(--muted); }
.tbl-note { margin-top: 8px; font-size: 0.875rem; color: var(--muted); }
.big-figs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 24px; }
@media (max-width: 640px) { .big-figs { grid-template-columns: minmax(0, 1fr); } }
.big-figs div { border-top: 2px solid var(--btn-bg); padding-top: 12px; }
.big-figs b { display: block; font: 700 var(--step-3)/1.1 var(--font-display); font-variant-numeric: tabular-nums; }
.big-figs span { display: block; margin-top: 6px; font-size: 0.9375rem; color: var(--muted); }
.takt { margin-top: 20px; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; background: var(--surface); }
.takt-row { display: grid; grid-template-columns: 150px minmax(0, 1fr) 64px; gap: 12px; align-items: center; font-size: 0.875rem; margin-top: 10px; }
@media (max-width: 560px) { .takt-row { grid-template-columns: 96px minmax(0, 1fr) 56px; font-size: 0.8125rem; } }
.takt-row:first-of-type { margin-top: 0; }
.takt-track { position: relative; height: 22px; background: var(--surface-2); border-radius: 4px; }
.takt-track .fill { position: absolute; inset: 0 auto 0 0; border-radius: 4px; background: var(--tint-blue); border: 1px solid var(--link); }
.takt-track .fill.over { background: repeating-linear-gradient(135deg, var(--tint-amber) 0 4px, transparent 4px 8px); border-color: var(--warn); }
.takt-track .fill.ok { background: var(--tint-green); border-color: var(--accent); }
.takt-track .line { position: absolute; top: -6px; bottom: -6px; width: 2px; background: var(--text); }
.takt-row .v { text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; }
.takt .src { margin-top: 12px; font-size: 0.8125rem; color: var(--muted); }