/* FluidTwin — site styles
   Tokens follow FluidTwin_Template_Word_2026-09-15: each colour has one job.
   Ink: body text · Deep: headings · Steel: primary/links · Cyan: accent edges
   Mute: captions · Alert: risk only · Panel: fills · Gradient: masthead only. */

/* ---------- Fonts (self-hosted, SIL OFL — see fonts/OFL.txt) ---------- */
@font-face { font-family: "IBM Plex Sans"; src: url("../fonts/IBMPlexSans-Light.ttf") format("truetype"); font-weight: 300; font-display: swap; }
@font-face { font-family: "IBM Plex Sans"; src: url("../fonts/IBMPlexSans-Regular.ttf") format("truetype"); font-weight: 400; font-display: swap; }
@font-face { font-family: "IBM Plex Sans"; src: url("../fonts/IBMPlexSans-Medium.ttf") format("truetype"); font-weight: 500; font-display: swap; }
@font-face { font-family: "IBM Plex Sans"; src: url("../fonts/IBMPlexSans-SemiBold.ttf") format("truetype"); font-weight: 600; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url("../fonts/IBMPlexMono-Regular.ttf") format("truetype"); font-weight: 400; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url("../fonts/IBMPlexMono-Medium.ttf") format("truetype"); font-weight: 500; font-display: swap; }

/* ---------- Tokens ---------- */
:root {
  --ink: #0C1420;
  --night: #080E16;
  --deep: #134A73;
  --steel: #2C7FB8;
  --cyan: #45C8D8;
  --mute: #56657A;
  --alert: #D2452E;
  --panel: #E2EAF2;
  --hairline: #B7C8D8;
  --tint: #EEF3F7;
  --mute-on-dark: #8FA3B8;

  /* roles */
  --bg: #FFFFFF;
  --bg-alt: var(--tint);
  --surface: var(--panel);
  --text: var(--ink);
  --heading: var(--deep);
  --link: var(--steel);
  --muted: var(--mute);
  --rule: var(--hairline);
  --btn-bg: var(--steel);
  --btn-text: #FFFFFF;
  --figure-bg: var(--tint);

  --gradient: linear-gradient(90deg, #3D2E6B 0%, #2C7FB8 30%, #45C8D8 52%, #81CF99 74%, #E8B54A 100%);

  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;

  --wrap: 1120px;
  --gutter: clamp(16px, 4vw, 40px);
  --radius: 6px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: var(--night);
    --bg-alt: #0D1622;
    --surface: #132131;
    --text: #E2EAF2;
    --heading: #FFFFFF;
    --link: var(--cyan);
    --muted: var(--mute-on-dark);
    --rule: #22344A;
    --btn-bg: var(--steel);
    --figure-bg: var(--surface);
  }
}
:root[data-theme="dark"] {
  --bg: var(--night);
  --bg-alt: #0D1622;
  --surface: #132131;
  --text: #E2EAF2;
  --heading: #FFFFFF;
  --link: var(--cyan);
  --muted: var(--mute-on-dark);
  --rule: #22344A;
  --btn-bg: var(--steel);
  --figure-bg: var(--surface);
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 1.0625rem/1.62 var(--sans);   /* 17px, template line spacing */
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
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: 2px solid var(--cyan); outline-offset: 3px; border-radius: 2px; }

h1, h2, h3 { color: var(--heading); margin: 0 0 .5em; line-height: 1.2; }
h1 { font-weight: 500; font-size: clamp(2.25rem, 1.4rem + 3.2vw, 3.5rem); letter-spacing: -0.015em; }
h2 { font-weight: 500; font-size: clamp(1.75rem, 1.3rem + 1.6vw, 2.375rem); letter-spacing: -0.01em; max-width: 24ch; }
h3 { font-weight: 600; font-size: 1.25rem; }
p { margin: 0 0 1em; max-width: 68ch; }
strong, .em { font-weight: 600; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.section { padding: clamp(64px, 9vw, 112px) 0; }
.section--alt { background: var(--bg-alt); }

.eyebrow {
  font: 500 .8125rem/1.4 var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--link);
  margin: 0 0 1rem;
}
.lead { font-weight: 300; font-size: clamp(1.125rem, 1rem + .5vw, 1.375rem); line-height: 1.5; color: var(--text); }
.secondary { font-size: .9375rem; color: var(--muted); }
.mono { font-family: var(--mono); }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 16px; z-index: 100; background: var(--bg); padding: 8px 12px; }

/* ---------- Masthead: the one instance of the gradient ---------- */
.masthead-bar { height: 4px; background: var(--gradient); }

.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--rule);
}
.site-header .wrap { display: flex; align-items: center; gap: 24px; min-height: 64px; }
.brand { font-weight: 600; font-size: 1.25rem; color: var(--heading); text-decoration: none; letter-spacing: -0.01em; display: flex; align-items: center; gap: 10px; }
.brand svg { width: 26px; height: 26px; }
.nav { display: flex; gap: 24px; margin-left: auto; }
.nav a { color: var(--text); text-decoration: none; font-size: .9375rem; }
.nav a:hover { color: var(--link); }
.theme-toggle {
  background: none; border: 1px solid var(--rule); color: var(--text);
  width: 36px; height: 36px; border-radius: 50%; cursor: pointer; display: grid; place-items: center;
}
.theme-toggle svg { width: 18px; height: 18px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font: 500 1rem/1 var(--sans);
  padding: 14px 22px; border-radius: var(--radius);
  text-decoration: none; border: 1px solid transparent; cursor: pointer;
}
.btn--primary { background: var(--btn-bg); color: var(--btn-text); }
.btn--primary:hover { background: var(--deep); text-decoration: none; }
.btn--ghost { color: var(--link); border-color: var(--rule); }
.btn--ghost:hover { border-color: var(--link); }
.btn--sm { padding: 9px 14px; font-size: .9375rem; }

/* ---------- Hero ---------- */
.hero { padding: clamp(48px, 7vw, 96px) 0 clamp(56px, 8vw, 104px); }
.hero .wrap { display: grid; grid-template-columns: 1.25fr .75fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.hero h1 { max-width: 16ch; }
.hero .lead { max-width: 36ch; margin-bottom: 2rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 2.5rem; }
.hero-figure {
  background: var(--figure-bg);
  border-radius: 12px;
  padding: 24px 24px 12px;
  justify-self: center;
  max-width: 340px; width: 100%;
}
.reactor { width: 100%; max-height: 520px; display: block; overflow: visible; }
.reactor .r-solid { fill: var(--surface); stroke: var(--heading); stroke-width: 1.5; }
.reactor .r-line { fill: none; stroke: var(--heading); stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.reactor .r-shaft { stroke-width: 2.5; }
.reactor .r-label { font: 500 9px var(--mono); letter-spacing: .1em; fill: var(--muted); }
.reactor .r-liquid { fill: var(--steel); fill-opacity: .16; }
.reactor .r-surface { stroke: var(--steel); stroke-width: 1.5; stroke-opacity: .6; }
.reactor .r-flow path { fill: none; stroke: var(--cyan); stroke-width: 1.6; stroke-linecap: round; stroke-dasharray: 3 6; }
.reactor .r-bubbles circle { fill: none; stroke: var(--steel); stroke-width: 1.2; opacity: 0; }
.reactor .r-baffle { fill: var(--bg); stroke: var(--heading); stroke-width: 1.2; }
.reactor .r-impeller { fill: var(--bg); stroke: var(--heading); stroke-width: 1.8; }
.reactor .r-sparger { stroke: var(--heading); stroke-width: 2; stroke-dasharray: 2 4; }
.reactor .r-wall { fill: none; stroke: var(--heading); stroke-width: 2.5; stroke-linejoin: round; }
@media (prefers-reduced-motion: no-preference) {
  .reactor .r-flow path { animation: r-flow 1.8s linear infinite; }
  .reactor .r-bubbles circle { animation: r-rise 3.5s ease-in infinite; animation-delay: var(--b); }
}
@keyframes r-flow { to { stroke-dashoffset: -36; } }
@keyframes r-rise {
  0% { transform: translateY(0); opacity: 0; }
  15% { opacity: .9; }
  85% { opacity: .6; }
  100% { transform: translateY(-185px); opacity: 0; }
}
.hero-figure figcaption { font: 400 .75rem/1.4 var(--mono); color: var(--muted); text-align: center; margin-top: 8px; }

/* Scale strip: bench → pilot → production */
.scale-strip { display: flex; align-items: stretch; gap: 0; border: 1px solid var(--rule); border-radius: var(--radius); overflow: hidden; max-width: 600px; }
.scale-step { flex: 1; padding: 12px 14px; white-space: nowrap; background: var(--bg); }
.scale-step + .scale-step { border-left: 1px solid var(--rule); }
.scale-step b { display: block; font: 500 .75rem/1.3 var(--mono); letter-spacing: .1em; color: var(--heading); }
.scale-step span { font: 400 .8125rem/1.4 var(--mono); color: var(--muted); }
.scale-step--risk { box-shadow: inset 0 -3px 0 var(--alert); }

/* ---------- Stat row (template one-pager treatment) ---------- */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 40px 0; }
.stat { background: var(--surface); border-radius: var(--radius); padding: 24px; }
.stat .num { font: 500 clamp(1.75rem, 1.4rem + 1.4vw, 2.5rem)/1.1 var(--mono); color: var(--heading); letter-spacing: -0.02em; display: block; margin-bottom: 8px; }
.stat .label { font-size: .9375rem; color: var(--muted); }

/* ---------- Callouts ---------- */
.callout { background: var(--surface); border-left: 4px solid var(--cyan); padding: 20px 24px; border-radius: 0 var(--radius) var(--radius) 0; margin: 32px 0; }
.callout p:last-child { margin-bottom: 0; }
.callout--risk { border-left-color: var(--alert); }
.callout h3 { margin-bottom: .75rem; font-size: 1rem; font: 500 .8125rem/1.4 var(--mono); letter-spacing: .1em; text-transform: uppercase; }

.risk-list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 32px; }
.risk-list li { padding-left: 18px; position: relative; }
.risk-list li::before { content: ""; position: absolute; left: 0; top: .7em; width: 8px; height: 2px; background: var(--alert); }

/* ---------- Cards ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 40px; }
.card { border: 1px solid var(--rule); border-radius: var(--radius); padding: 24px; background: var(--bg); }
.card h3 { margin-bottom: .5rem; }
.card p { margin: 0; color: var(--text); }
.card .tag { font: 500 .75rem/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); display: block; margin-bottom: 12px; }

/* Solution pipeline */
.pipeline { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 16px; align-items: stretch; margin-top: 40px; }
.pipeline .arrow { align-self: center; color: var(--link); font: 400 1.5rem/1 var(--mono); }
.pipeline .card { border-top: 3px solid var(--steel); }

.proof { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; padding-top: 32px; }
.proof .num { font: 500 1.75rem/1.1 var(--mono); color: var(--heading); display: block; margin-bottom: 8px; }
.proof p { font-size: .9375rem; color: var(--muted); margin: 0; }

/* ---------- Audience ---------- */
.audience { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 5vw, 72px); align-items: start; }
.audience .stats { grid-template-columns: 1fr 1fr; margin: 0; }

/* ---------- Quotes ---------- */
.quotes { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 40px; }
.quote { margin: 0; padding: 28px; background: var(--bg); border: 1px solid var(--rule); border-radius: var(--radius); display: flex; flex-direction: column; }
.quote blockquote { margin: 0 0 20px; font-weight: 300; font-size: 1.1875rem; line-height: 1.5; flex: 1; }
.quote figcaption { font-size: .9375rem; color: var(--muted); }
.quote figcaption b { color: var(--text); font-weight: 600; display: block; }

/* ---------- Team & contact ---------- */
.team { display: grid; grid-template-columns: repeat(2, minmax(0, 320px)); gap: 20px; margin-top: 32px; }
.person { display: flex; gap: 16px; align-items: center; }
.avatar { width: 56px; height: 56px; border-radius: 50%; background: var(--surface); color: var(--heading); display: grid; place-items: center; font: 500 1rem/1 var(--mono); flex: none; }
.person b { display: block; color: var(--heading); font-weight: 600; }
.person span { font-size: .9375rem; color: var(--muted); }

.contact { background: var(--night); color: #E2EAF2; border-top: 1px solid var(--rule); }
:root[data-theme="dark"] .contact { background: #0D1622; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .contact { background: #0D1622; } }
.contact h2 { color: #FFFFFF; }
.contact .eyebrow { color: var(--cyan); }
.contact p { color: #C9D5E2; }
.contact .secondary { color: var(--mute-on-dark); }
.contact .btn--ghost { color: #FFFFFF; border-color: #2A3E55; }
.contact .btn--ghost:hover { border-color: var(--cyan); }

/* ---------- Footer ---------- */
.site-footer { background: var(--night); color: var(--mute-on-dark); border-top: 1px solid #1A2838; padding: 32px 0; font-size: .875rem; }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; }
.site-footer a { color: var(--mute-on-dark); }
.glossary { font: 400 .75rem/1.6 var(--mono); color: var(--mute-on-dark); max-width: 80ch; }

/* ---------- Motion (driven by js/motion.js; only applies when JS runs) ---------- */
:root { --ease: cubic-bezier(.22, 1, .36, 1); }
.js [data-reveal] {
  opacity: 0; transform: translateY(20px); filter: blur(6px);
  transition: opacity 1.1s var(--ease), transform 1.1s var(--ease), filter 1.1s var(--ease);
  transition-delay: calc(var(--i, 0) * 110ms + var(--d, 0ms));
}
.js [data-reveal].is-in { opacity: 1; transform: none; filter: none; }

.js [data-reveal="lines"] { opacity: 1; transform: none; filter: none; }
.w { display: inline-block; overflow: hidden; vertical-align: top; padding-bottom: .12em; margin-bottom: -.12em; }
.w > span { display: inline-block; }
.js .w > span { transform: translateY(110%); transition: transform 1.1s var(--ease); transition-delay: calc(var(--wi) * 45ms + var(--d, 0ms)); }
.js .is-in .w > span { transform: none; }

.draw-rule { border: 0; height: 1px; background: var(--rule); margin: 56px 0 0; transform-origin: left; }
.js .draw-rule { transform: scaleX(0); transition: transform 1.8s var(--ease) .15s; }
.js .draw-rule.is-in { transform: none; }

.js .masthead-bar { transform-origin: left; animation: draw-x 2.2s var(--ease) .15s both; }
@keyframes draw-x { from { transform: scaleX(0); } to { transform: none; } }

/* ---------- Demo ---------- */
.demo { display: grid; grid-template-columns: minmax(280px, 400px) 1fr; gap: clamp(24px, 4vw, 56px); margin-top: 48px; align-items: start; }
.demo-stage { position: sticky; top: 88px; }
.canvas-wrap { position: relative; }
#demo-canvas { width: 100%; display: block; touch-action: pan-y; }
.demo-tip {
  position: absolute; pointer-events: none; z-index: 2;
  background: var(--bg); color: var(--text); border: 1px solid var(--rule); border-radius: var(--radius);
  padding: 6px 10px; font: 400 .8125rem/1.4 var(--mono); box-shadow: 0 4px 16px rgba(8, 14, 22, .12); white-space: nowrap;
}
.demo-tip span { color: var(--muted); }

.seg, .presets { display: inline-flex; border: 1px solid var(--rule); border-radius: var(--radius); overflow: hidden; margin-bottom: 16px; background: var(--bg); }
.presets { display: flex; margin-bottom: 24px; }
.seg button, .presets button {
  flex: 1; white-space: nowrap; font: 500 .8125rem/1 var(--sans); padding: 10px 14px; border: 0; background: none; color: var(--text); cursor: pointer;
}
.seg button + button, .presets button + button { border-left: 1px solid var(--rule); }
.seg button[aria-pressed="true"], .presets button[aria-pressed="true"] { background: var(--steel); color: #fff; }

.legend { margin-top: 8px; }
.legend-label { font-size: .8125rem; color: var(--muted); }
.legend-bar { height: 10px; border-radius: 3px; margin: 6px 0 4px; border: 1px solid var(--rule); }
.legend-ticks { display: flex; justify-content: space-between; font: 400 .75rem/1 var(--mono); color: var(--muted); }
.demo-dims { font: 400 .8125rem/1.5 var(--mono); color: var(--muted); margin: 12px 0 0; }
.tracer-panel { display: none; margin-top: 12px; font-size: .9375rem; gap: 8px 12px; flex-wrap: wrap; align-items: center; }
.tracer-panel b { font-family: var(--mono); font-weight: 500; color: var(--heading); }
.is-tracer .tracer-panel { display: flex; }
.is-tracer .legend-label::after { content: " (tracer vs final)"; }

.controls { display: grid; gap: 18px; margin-bottom: 28px; }
.control { display: grid; gap: 6px; }
.control > span { display: flex; justify-content: space-between; font-size: .9375rem; font-weight: 500; }
.control output { font: 500 .9375rem/1.4 var(--mono); color: var(--heading); }
.control input[type="range"] { width: 100%; accent-color: var(--steel); margin: 0; height: 24px; }

.readouts { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.readout { background: var(--bg); border: 1px solid var(--rule); border-radius: var(--radius); padding: 16px; display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.readout .tag { font: 500 .6875rem/1.2 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin-bottom: 4px; }
.readout b { font: 500 1.25rem/1.25 var(--mono); color: var(--heading); }
.ro-sub { font: 400 .75rem/1.4 var(--mono); color: var(--muted); }
.status { display: inline-flex; align-items: center; gap: 6px; font-size: .8125rem; font-weight: 600; margin-top: 6px; color: var(--text); }
.status-icon svg { width: 12px; height: 12px; display: block; }
.status-icon { width: 18px; height: 18px; border-radius: 50%; display: grid; place-items: center; font: 600 .6875rem/1 var(--mono); flex: none; }
.status--ok .status-icon { background: var(--surface); color: var(--link); }
.status--risk .status-icon { border: 1.5px solid var(--alert); color: var(--alert); }
.status--bad { color: var(--alert); }
.status--bad .status-icon { background: var(--alert); color: #fff; }

.demo-advice { margin: 20px 0 0; background: var(--bg); }
.demo-advice ul { margin: 0; padding-left: 18px; }
.demo-advice li + li { margin-top: 6px; }
.demo-advice p { margin: 0; }
.demo-note { margin-top: 32px; max-width: 90ch; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .demo { grid-template-columns: 1fr; }
  .demo-stage { position: static; max-width: 420px; width: 100%; margin: 0 auto; }
  .js .pipeline .arrow[data-reveal] { transform: rotate(90deg); }
  .nav { display: none; }
  .hero .wrap, .audience { grid-template-columns: 1fr; }
  .hero-figure { max-width: 260px; order: -1; }
  .pipeline { grid-template-columns: 1fr; }
  .pipeline .arrow { transform: rotate(90deg); justify-self: center; }
  .grid-3, .proof, .quotes { grid-template-columns: 1fr; }
  .site-header .btn { margin-left: auto; }
}
@media (max-width: 560px) {
  .stats, .audience .stats { grid-template-columns: 1fr; }
  .risk-list { grid-template-columns: 1fr; }
  .team { grid-template-columns: 1fr; }
  .scale-strip { flex-direction: column; }
  .scale-step + .scale-step { border-left: 0; border-top: 1px solid var(--rule); }
  .site-header .btn { display: none; }
  .theme-toggle { margin-left: auto; }
}
@media (max-width: 420px) {
  .readouts { grid-template-columns: 1fr; }
  .presets button { padding: 10px 8px; font-size: .75rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js [data-reveal], .js .w > span, .js .draw-rule, .js .masthead-bar { transition: none; animation: none; opacity: 1; transform: none; filter: none; }
}