:root {
  --ink: #14202b;
  --text: #1f2937;
  --muted: #5b6676;
  --surface: #f4f6f8;
  --paper: #ffffff;
  --sketch: #fdfcf9;
  --border: #dde3ea;
  --blue: #2463a6;
  --teal: #197487;
  --amber: #d97706;
  --hero: linear-gradient(135deg, #1d3750 0%, #1e4c80 55%, #135c6c 100%);
  --sans: 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, Consolas, monospace;
  --radius: 12px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body { margin: 0; background: var(--paper); color: var(--text); font: 400 17px/1.6 var(--sans); -webkit-font-smoothing: antialiased; }
h1, h2, h3 { color: var(--ink); font-weight: 600; letter-spacing: -0.015em; margin: 0; }
h1 { font-size: clamp(2rem, 4.2vw, 3.4rem); line-height: 1.12; max-width: 19em; }
h2 { font-size: clamp(1.6rem, 2.8vw, 2.3rem); line-height: 1.2; max-width: 22em; }
h3 { font-size: 1.05rem; line-height: 1.35; }
p { margin: 0; }
a { color: inherit; }
.wrap { max-width: 1140px; margin: 0 auto; padding: 0 24px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--paper); padding: 8px 12px; z-index: 50; }
.skip:focus { left: 8px; }
:focus-visible { outline: 3px solid var(--teal); outline-offset: 3px; border-radius: 4px; }
.eyebrow { font: 500 0.74rem/1.4 var(--mono); letter-spacing: 0.16em; text-transform: uppercase; color: rgba(255, 255, 255, 0.72); margin-bottom: 18px; }
.eyebrow.dark { color: var(--teal); }
.intro { color: var(--muted); font-size: 1.05rem; max-width: 38em; margin-top: 14px; }
.num { display: block; font: 500 0.8rem var(--mono); color: var(--teal); letter-spacing: 0.08em; margin-bottom: 10px; }

/* Navigation */
.nav { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 14px 24px; background: rgba(255, 255, 255, 0.92); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-weight: 600; letter-spacing: -0.01em; }
.brand .logo-mark { color: var(--blue); flex: none; }
.nav nav { display: flex; align-items: center; gap: 26px; font-size: 0.95rem; }
.nav nav a { text-decoration: none; color: var(--muted); }
.nav nav a:hover { color: var(--ink); }
.nav nav .nav-cta { color: var(--blue); font-weight: 500; }
.nav nav .nav-signin { color: var(--ink); border: 1px solid var(--border); border-radius: 999px; padding: 5px 14px; }
.nav nav .nav-signin:hover { border-color: var(--blue); color: var(--blue); }

/* Buttons */
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.btn { display: inline-flex; align-items: center; min-height: 46px; padding: 0 20px; border-radius: 999px; background: #fff; color: var(--ink); text-decoration: none; font-weight: 500; border: 1px solid #fff; }
.btn:hover { background: #e8f1f8; }
.btn.ghost { background: transparent; color: #fff; border-color: rgba(255, 255, 255, 0.45); }
.btn.ghost:hover { background: rgba(255, 255, 255, 0.08); }

/* Hero: the attractor */
.hero { background: var(--hero); color: #fff; padding: 80px 0 28px; overflow: hidden; }
.hero h1 { color: #fff; }
.lede { font-size: 1.15rem; color: rgba(255, 255, 255, 0.85); margin-top: 20px; max-width: 40em; }
.hero-figure { margin-top: 44px; }
.hero-art { display: block; width: 100%; height: auto; }
.hero-tall { display: none; max-width: 420px; margin: 0 auto; }
.flow { fill: none; stroke: rgba(255, 255, 255, 0.26); stroke-width: 1.3; stroke-dasharray: 2 7; animation: dash 1.6s linear infinite; }
.flow-in { stroke: rgba(251, 191, 36, 0.32); }
.flow-out { stroke: rgba(142, 227, 232, 0.5); }
@keyframes dash { to { stroke-dashoffset: -18; } }
.symptom { animation: jitter 3.4s ease-in-out infinite; }
.symptom rect { fill: rgba(251, 191, 36, 0.08); stroke: rgba(251, 191, 36, 0.55); }
.symptom .warn { fill: #fbbf24; }
@keyframes jitter { 0%, 100% { transform: translateX(0); } 50% { transform: translateX(3px); } }
.h-label { fill: #fff; font: 500 13px var(--mono); }
.h-caption { fill: rgba(255, 255, 255, 0.6); font: 500 11px var(--mono); letter-spacing: 0.14em; }
.engine .ring-soft { fill: rgba(255, 255, 255, 0.04); stroke: rgba(255, 255, 255, 0.14); }
.engine .ring-dash { fill: none; stroke: rgba(255, 255, 255, 0.4); stroke-width: 1.4; stroke-dasharray: 3 9; }
.engine .ring { fill: none; stroke: rgba(255, 255, 255, 0.8); stroke-width: 1.6; }
.engine .core { fill: #fff; }
.spin { animation: spin 30s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.p-out { fill: #8ee3e8; }
.p-exception { fill: #fbbf24; }
.h-icon { color: #fff; }
.output { animation: breathe 4.2s ease-in-out infinite; }
@keyframes breathe { 0%, 100% { opacity: 0.62; } 50% { opacity: 1; } }

/* The story: a flipbook */
.story { padding: 104px 0 24px; }
.story-grid { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr); gap: 56px; margin-top: 36px; }
.stage-frame { position: relative; width: 100%; background: var(--sketch); border: 1px solid var(--border); border-radius: 16px; box-shadow: 6px 6px 0 -1px var(--sketch), 6px 6px 0 0 var(--border), 12px 12px 0 -1px var(--sketch), 12px 12px 0 0 var(--border); }
.scene { margin: 0; }
.scene-svg { display: block; width: 100%; height: auto; }
.page-count { display: none; position: absolute; right: 12px; bottom: 10px; font: 500 0.72rem var(--mono); color: var(--muted); letter-spacing: 0.08em; background: var(--sketch); padding: 2px 6px; border-radius: 6px; }
.steps { list-style: none; margin: 0; padding: 0; }
.step { padding: 22px 0; }
.step h3 { font-size: 1.45rem; }
.step p { color: var(--muted); margin-top: 10px; font-size: 1.06rem; max-width: 26em; }
.js .stage { position: sticky; top: 96px; align-self: start; }
.js .stage-frame { aspect-ratio: 16 / 9; }
.js .scene { position: absolute; inset: 0; opacity: 0; }
.js .scene.on { opacity: 1; }
.js .scene-svg { height: 100%; }
.js .page-count { display: block; }
.js .step { min-height: 72vh; display: flex; flex-direction: column; justify-content: center; opacity: 0.32; transition: opacity 0.3s; }
.js .step.on { opacity: 1; }
.flip { animation: flip 0.3s steps(3); }
@keyframes flip { 0% { transform: perspective(900px) rotateY(-10deg) translateX(-8px); } 100% { transform: none; } }

.scene-art { fill: none; stroke: var(--ink); stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
.scene-art .fp { fill: var(--sketch); }
.scene-art .dot { fill: var(--ink); stroke: none; }
.scene-art .amber, .scene-art .hl { stroke: var(--amber); }
.scene-art .teal { stroke: var(--teal); }
.scene-art .dashed { stroke-dasharray: 6 8; }
.scene-art .tape { stroke: #d7b47a; stroke-width: 6; opacity: 0.7; }
.scene-art .squiggle, .scene-art .motion { stroke: var(--muted); }
.scene-art .motion { stroke-dasharray: 12 10; }
.scene-art .trail { stroke: var(--amber); stroke-opacity: 0.35; stroke-dasharray: 3 6; stroke-width: 1.6; }
.scene-art .queue circle { fill: var(--sketch); }
.scene-art .fixed { color: var(--teal); }
.scene-art text { stroke: none; }
.st { font: 500 16px var(--sans); fill: var(--ink); }
.st-mono { font: 500 12px var(--mono); fill: var(--muted); letter-spacing: 0.08em; }
.st-big { font: 700 46px var(--sans); fill: var(--amber); }
.st-mono.amber-text, .amber-text { fill: var(--amber); }
.st-tag { font: 500 14px var(--mono); }
.warn-tag rect { fill: #fff6e8; stroke: var(--amber); }
.warn-tag text { fill: #b45309; }
.fix-tag rect { fill: #e9f5f5; stroke: var(--teal); }
.fix-tag text { fill: var(--teal); }
.b-warn rect, .b-warn path { stroke: var(--amber); }
.b-calm rect, .b-calm path { stroke: var(--blue); }

.js .pop, .js .late { opacity: 0; }
.scene.on .pop { animation: pop 0.36s steps(3) both; }
.scene.on .late { animation: pop 0.4s steps(3) 2.4s both; }
@keyframes pop { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.scene.on .drift { animation: drift 2.2s steps(8) 0.4s both; }
@keyframes drift { to { transform: translate(-145px, 86px); opacity: 0.3; } }
.scene.on .bounce { animation: bounce 1.2s steps(6) infinite; transform-box: view-box; transform-origin: 360px 360px; }
@keyframes bounce { 0%, 100% { transform: none; } 40% { transform: translateY(-10px) rotate(-1.6deg); } 60% { transform: translateY(-4px) rotate(0.8deg); } }
.scene.on .slide { animation: slide 1.2s steps(6) infinite; }
@keyframes slide { 0%, 100% { transform: translateX(0); } 50% { transform: translateX(22px); } }
.scene.on .grow { stroke-dasharray: 260; animation: draw 1.4s steps(10) 0.6s both; }
@keyframes draw { from { stroke-dashoffset: 260; } to { stroke-dashoffset: 0; } }

/* The series: pick a problem */
.picker { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.pick { display: flex; flex-direction: column; gap: 2px; padding: 12px 18px; border: 1px solid var(--border); border-radius: 12px; background: var(--paper); text-decoration: none; min-width: 190px; }
.pick-label { font-weight: 600; color: var(--ink); }
.pick-sub { font: 400 0.8rem var(--mono); color: var(--muted); }
a.pick:hover { border-color: var(--teal); }
.pick[aria-current] { border-color: var(--amber); box-shadow: inset 3px 0 0 var(--amber); background: #fffaf1; }
.pick.soon { border-style: dashed; opacity: 0.6; }
.story-set { margin-top: 64px; }
.story-set[hidden] { display: none; }
.story-kicker { font: 500 0.74rem var(--mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--amber); }
.story-title { font-size: clamp(1.4rem, 2.4vw, 1.9rem); line-height: 1.25; margin-top: 10px; max-width: 24em; }

/* The range of fixes: an inverted pyramid, like a hierarchy of controls */
.ladder { margin: 40px auto 0; max-width: 820px; text-align: center; }
.rungs { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 8px; justify-items: center; }
.rung { width: 100%; padding: 16px 22px; border-radius: 10px; border: 1px solid #b9dcdc; background: #eef7f7; }
.rung.better { width: 86%; background: #f3f9f9; }
.rung.good { width: 72%; background: var(--paper); border-color: var(--border); }
.rung-tag { display: block; font: 500 0.72rem var(--mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--teal); }
.rung p { margin-top: 6px; color: var(--ink); }
.ladder-note { color: var(--muted); font-size: 0.95rem; max-width: 40em; margin: 18px auto 0; }

/* Story details: emotion and time */
.scene-art .rose { stroke: #c2416b; }
.scene-art .heart { fill: #c2416b; stroke: #c2416b; stroke-width: 1; }
.scene-art .tear { fill: #5b9bd5; stroke: none; }
.b-rose rect, .b-rose path { stroke: #c2416b; }
.st-micro { font: 600 9px var(--mono); letter-spacing: 0.08em; }
.st-day { font: 700 26px var(--sans); fill: var(--ink); }
.st-huge { font: 700 64px var(--sans); fill: var(--teal); }
.st-badge { font: 700 14px var(--sans); fill: #fff; }
.scene-art .badge { fill: var(--amber); stroke: none; }
.scene-art .check { stroke: var(--teal); stroke-width: 4; }
.scene-art .faint { opacity: 0.4; }
.scene-art .fix-zone { fill: #e9f5f5; stroke: var(--teal); }
.scene.on .tick { animation: tick 6s steps(12) infinite; }
@keyframes tick { to { transform: rotate(360deg); } }
.scene.on .fly { animation: fly 1.8s steps(9) 0.3s both; }
@keyframes fly { to { transform: translate(330px, 72px); } }
.scene.on .fall .tear { animation: fall 1.4s ease-in infinite; }
@keyframes fall { from { transform: translateY(0); opacity: 1; } to { transform: translateY(28px); opacity: 0; } }
.scene.on .leave { animation: leave 2.4s steps(8) 0.8s both; }
@keyframes leave { to { transform: translateX(220px); } }

/* Sections */
.section { padding: 104px 0; }
.tint { background: var(--surface); }

.pains { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; margin-top: 44px; }
.pain { background: var(--paper); border: 1px solid var(--border); border-left: 3px solid var(--amber); border-radius: var(--radius); padding: 26px; }
.pain h3 { font-size: 1.2rem; }
.pain dl { margin: 6px 0 0; }
.pain dt { font: 500 0.7rem var(--mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--amber); margin-top: 14px; }
.pain dt:nth-of-type(2) { color: var(--teal); }
.pain dd { margin: 4px 0 0; color: var(--muted); font-size: 0.97rem; }

.difference { background: var(--hero); color: #fff; padding: 96px 0; text-align: center; }
.difference .logo-mark { color: #fff; margin: 0 auto 26px; display: block; }
.statement { font-size: clamp(1.55rem, 3.1vw, 2.5rem); font-weight: 600; line-height: 1.25; letter-spacing: -0.015em; max-width: 24em; margin: 0 auto; }
.statement em { font-style: normal; color: #8ee3e8; }
.difference .intro { color: rgba(255, 255, 255, 0.78); margin: 22px auto 0; }

.stages { list-style: none; padding: 0; margin: 52px 0 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 28px; border-top: 1px solid var(--border); }
.stages li { padding-top: 22px; position: relative; }
.stages li::before { content: ''; position: absolute; top: -5px; left: 0; width: 9px; height: 9px; border-radius: 50%; background: var(--teal); }
.stages p { color: var(--muted); font-size: 0.95rem; margin-top: 8px; }
.principles-strip { list-style: none; padding: 0; margin: 48px 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.principles-strip li { border: 1px solid var(--border); border-radius: 999px; padding: 5px 13px; font: 400 0.84rem var(--mono); color: var(--muted); }
.principles-strip .lead { border-color: var(--amber); background: #fff6e8; color: #a14a06; font-weight: 500; }

.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin-top: 48px; }
.card { background: var(--paper); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; }
.card-art { width: 44px; height: 44px; color: var(--blue); margin-bottom: 22px; display: block; }
.card-art .exception { fill: var(--amber); }
.card p { color: var(--muted); margin-top: 8px; font-size: 0.98rem; }

.range { display: grid; grid-template-columns: 1fr 1.2fr; gap: 72px; }
.chips-group h3 { font: 500 0.74rem var(--mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); margin: 0 0 12px; }
.chips-group h3:not(:first-child) { margin-top: 28px; }
.chips { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.chips li { background: var(--paper); border: 1px solid var(--border); border-radius: 999px; padding: 5px 13px; font-size: 0.93rem; }
.chips.mono li { font: 400 0.84rem var(--mono); }
.chips .more { border-style: dashed; color: var(--muted); }
.credential { margin-top: 28px; font-size: 0.95rem; color: var(--ink); border-left: 3px solid var(--teal); padding-left: 14px; }

.confidential { background: var(--ink); color: #dfe7ee; padding: 40px 0; }
.confidential p { max-width: 50em; }
.confidential strong { color: #fff; }

.contact { text-align: center; }
.contact h2, .contact .intro { margin-left: auto; margin-right: auto; }
.contact .actions { justify-content: center; }
.contact .btn { background: var(--blue); border-color: var(--blue); color: #fff; }
.contact .btn:hover { background: #1d528c; }
.contact .btn.quiet { background: transparent; color: var(--blue); }
.where { margin-top: 24px; font: 400 0.85rem var(--mono); color: var(--muted); }
.pending { font: 400 0.85rem var(--mono); color: var(--muted); border: 1px dashed var(--border); border-radius: 999px; padding: 12px 20px; }

.footer { border-top: 1px solid var(--border); padding: 26px 0; font-size: 0.9rem; color: var(--muted); }
.footer .wrap { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.brand.small { font-weight: 500; }

@media (max-width: 960px) {
  .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stages { grid-template-columns: 1fr; border-top: 0; border-left: 1px solid var(--border); gap: 26px; padding-left: 24px; }
  .stages li { padding-top: 0; }
  .stages li::before { top: 7px; left: -29px; }
  .range { grid-template-columns: 1fr; gap: 44px; }
  .story-grid { grid-template-columns: 1fr; gap: 0; }
  .js .stage { top: 64px; height: auto; padding: 12px 0; background: var(--paper); z-index: 5; }
  .js .step { min-height: 64vh; }
}
@media (max-width: 760px) {
  .hero-wide { display: none; }
  .hero-tall { display: block; }
}
@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
  .nav { padding: 12px 16px; }
  .nav nav a:not(.nav-cta):not(.nav-signin) { display: none; }
  .nav nav { gap: 16px; }
  .hero { padding-top: 52px; }
  .section, .story { padding: 72px 0; }
  .cards { grid-template-columns: 1fr; }
  .step h3 { font-size: 1.25rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .flow, .spin, .output, .symptom, .flip { animation: none; }
  .scene-art { filter: none; }
  .js .pop, .js .late { opacity: 1; }
  .scene.on .pop, .scene.on .late, .scene.on .drift, .scene.on .bounce, .scene.on .slide, .scene.on .grow,
  .scene.on .tick, .scene.on .fly, .scene.on .fall .tear, .scene.on .leave { animation: none; }
}