:root {
  --ink: #111417;
  --muted: #5e666c;
  --paper: #f4f5f2;
  --white: #ffffff;
  --line: #d6dad6;
  --acid: #b8f235;
  --sky: #6bd4ff;
  --blue: #165bf5;
  --deep: #17212b;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { min-width: 320px; margin: 0; background: var(--paper); }
a { color: inherit; }
.skip-link { position: fixed; z-index: 99; top: 8px; left: 8px; padding: 10px 14px; color: white; background: var(--ink); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
.site-header { width: min(1440px, 100%); min-height: 82px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 38px; margin: 0 auto; padding: 0 clamp(24px, 5vw, 76px); border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 11px; justify-self: start; font-size: 1.05rem; font-weight: 750; letter-spacing: -0.02em; text-decoration: none; }
.brand-mark { width: 24px; height: 24px; display: inline-block; border: 5px solid var(--ink); border-top: 0; border-right: 0; border-radius: 2px; position: relative; }
.brand-mark::after { content: ""; position: absolute; width: 6px; height: 6px; right: -7px; top: -2px; border-radius: 50%; background: var(--blue); }
.site-header nav { display: flex; gap: 34px; }
.site-header nav a { padding: 30px 0 27px; color: #333a3f; font-size: 0.88rem; font-weight: 650; text-decoration: none; }
.site-header nav a:hover, .site-header nav a[aria-current="page"] { box-shadow: inset 0 -2px var(--ink); }
.header-action { justify-self: end; padding: 10px 15px; border: 1px solid var(--ink); border-radius: 999px; font-size: 0.83rem; font-weight: 700; text-decoration: none; }
.header-action:hover { color: white; background: var(--ink); }

.hero { width: min(1440px, 100%); display: grid; grid-template-columns: minmax(0, .92fr) minmax(480px, 1.08fr); gap: clamp(44px, 6vw, 96px); align-items: center; margin: 0 auto; padding: clamp(70px, 9vw, 132px) clamp(24px, 5vw, 76px) 108px; }
.eyebrow { margin: 0 0 25px; color: var(--blue); font-size: 0.77rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.hero h1 { max-width: 690px; margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(3.45rem, 6vw, 6.7rem); font-weight: 400; letter-spacing: -.055em; line-height: .96; }
.hero-text { max-width: 625px; margin: 34px 0 0; color: #3c454b; font-size: 1.12rem; line-height: 1.75; }
.hero-actions { display: flex; align-items: center; gap: 26px; margin-top: 34px; }
.button { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; padding: 0 20px; border-radius: 3px; font-size: .9rem; font-weight: 750; text-decoration: none; }
.button.primary { color: white; background: var(--ink); }
.button.primary:hover { background: var(--blue); }
.text-link { color: #30383d; font-size: .9rem; font-weight: 700; text-underline-offset: 5px; }
.hero-facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 52px 0 0; padding-top: 22px; border-top: 1px solid var(--line); }
.hero-facts dt { color: var(--muted); font-size: .73rem; letter-spacing: .05em; text-transform: uppercase; }
.hero-facts dd { margin: 8px 0 0; font-size: .88rem; font-weight: 700; line-height: 1.4; }

.product-window { min-width: 0; overflow: hidden; border: 1px solid #2d343a; border-radius: 14px; background: #eef1ed; box-shadow: 20px 24px 0 var(--acid); transform: rotate(.7deg); }
.window-bar { min-height: 48px; display: flex; justify-content: space-between; align-items: center; padding: 0 17px; color: #cbd1d4; background: var(--deep); font-size: .73rem; }
.session-state { color: var(--acid); }
.problem-panel { padding: clamp(24px, 4vw, 46px); }
.problem-meta { display: flex; justify-content: space-between; color: var(--muted); font-size: .73rem; font-weight: 750; letter-spacing: .04em; text-transform: uppercase; }
.problem-panel h2 { max-width: 650px; margin: 32px 0 30px; font-family: Georgia, "Times New Roman", serif; font-size: clamp(1.7rem, 3vw, 2.7rem); font-weight: 400; line-height: 1.2; }
.claim-box { padding: 15px 17px; border: 1px solid var(--line); background: white; }
.claim-box span { color: var(--muted); font-size: .7rem; font-weight: 750; text-transform: uppercase; }
.claim-box p { margin: 8px 0 0; font-size: .95rem; }
.coach-note { display: grid; grid-template-columns: 36px 1fr; gap: 13px; margin-top: 13px; padding: 16px; color: white; background: var(--deep); }
.coach-icon { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 50%; color: var(--ink); background: var(--acid); font-weight: 850; }
.coach-note strong { color: var(--acid); font-size: .76rem; letter-spacing: .04em; text-transform: uppercase; }
.coach-note p { margin: 6px 0 0; color: #dce1e3; font-size: .88rem; line-height: 1.55; }
.reasoning-map { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 28px; }
.reasoning-map div { position: relative; padding-right: 9px; color: #7c8589; font-size: .7rem; line-height: 1.35; }
.reasoning-map div::before { content: ""; position: absolute; top: 5px; right: 0; left: 13px; height: 1px; background: #bec4c1; }
.reasoning-map div:last-child::before { display: none; }
.reasoning-map span { position: relative; z-index: 1; width: 11px; height: 11px; display: block; margin-bottom: 10px; border: 2px solid #a3aaa7; border-radius: 50%; background: #eef1ed; }
.reasoning-map .complete span { border-color: var(--blue); background: var(--blue); }
.reasoning-map .active { color: var(--ink); font-weight: 750; }
.reasoning-map .active span { border-color: var(--blue); box-shadow: 0 0 0 4px rgba(22,91,245,.13); }
.reasoning-map p { margin: 0; }

.statement { width: min(1440px, 100%); display: grid; grid-template-columns: 1fr 2fr; gap: 55px; margin: 0 auto; padding: 78px clamp(24px, 5vw, 76px) 98px; color: white; background: var(--ink); }
.statement p { margin: 8px 0 0; color: #aeb5b9; font-size: 1rem; }
.statement h2 { max-width: 850px; margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2.4rem, 5vw, 5rem); font-weight: 400; letter-spacing: -.035em; line-height: 1.05; }

.content-block { width: min(1440px, 100%); margin: 0 auto; padding: clamp(82px, 10vw, 144px) clamp(24px, 7vw, 104px); }
.section-intro { max-width: 800px; }
.section-intro h2 { margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2.65rem, 5vw, 5.2rem); font-weight: 400; letter-spacing: -.045em; line-height: 1.03; }
.section-intro > p:last-child { max-width: 690px; margin: 26px 0 0; color: var(--muted); font-size: 1.04rem; line-height: 1.7; }
.step-grid { display: grid; grid-template-columns: repeat(4, 1fr); margin: 66px 0 34px; padding: 0; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--line); list-style: none; }
.step-grid li { min-height: 255px; padding: 25px 24px 28px; border-right: 1px solid var(--line); }
.step-grid li:last-child { border-right: 0; }
.step-grid span, .card-index, .system-number { color: var(--blue); font-size: .72rem; font-weight: 800; letter-spacing: .07em; text-transform: uppercase; }
.step-grid h3 { margin: 75px 0 12px; font-family: Georgia, "Times New Roman", serif; font-size: 1.6rem; font-weight: 400; }
.step-grid p { margin: 0; color: var(--muted); line-height: 1.55; }
.dark-section { width: min(1440px, 100%); margin: 0 auto; padding: clamp(82px, 10vw, 144px) clamp(24px, 7vw, 104px); color: white; background: var(--deep); }
.dark-section .eyebrow { color: var(--acid); }
.dark-section .section-intro > p:last-child { color: #b9c1c5; }
.value-grid, .system-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 64px; background: #46515a; border: 1px solid #46515a; }
.value-grid article, .system-grid article { padding: clamp(25px, 4vw, 43px); background: var(--deep); }
.value-grid .card-index { color: var(--acid); }
.value-grid h3, .system-grid h3 { margin: 48px 0 15px; font-family: Georgia, "Times New Roman", serif; font-size: clamp(1.45rem, 2.5vw, 2.15rem); font-weight: 400; line-height: 1.15; }
.value-grid article > p:last-child, .system-grid article > p { color: #bdc5c8; line-height: 1.65; }
.metric-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin: 56px 0 34px; }
.metric-grid article { padding: 28px; border-top: 3px solid var(--blue); background: var(--white); }
.metric-grid strong { font-family: Georgia, "Times New Roman", serif; font-size: 1.5rem; font-weight: 400; }
.metric-grid p { margin: 18px 0 0; color: var(--muted); line-height: 1.6; }
.button.secondary { border: 1px solid var(--ink); }
.button.secondary:hover { color: white; background: var(--ink); }
.final-cta { width: min(1440px, 100%); margin: 0 auto; padding: clamp(82px, 9vw, 125px) clamp(24px, 7vw, 104px); text-align: center; background: var(--acid); }
.final-cta .eyebrow { color: var(--ink); }
.final-cta h2 { margin: 0 auto 32px; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2.9rem, 6vw, 6rem); font-weight: 400; letter-spacing: -.05em; line-height: 1; }
.site-footer { width: min(1440px, 100%); display: grid; grid-template-columns: 1fr 1fr auto; gap: 30px; align-items: center; margin: 0 auto; padding: 55px clamp(24px, 5vw, 76px) 30px; color: #bcc3c7; background: var(--ink); }
.site-footer .brand { color: white; }
.site-footer .brand-mark { border-color: white; }
.site-footer p { margin: 0; font-size: .84rem; }
.site-footer nav { display: flex; gap: 22px; }
.site-footer nav a { color: white; font-size: .82rem; }
.site-footer .fine-print { grid-column: 1 / -1; padding-top: 26px; border-top: 1px solid #353b40; color: #7f898e; }

.page-hero { width: min(1440px, 100%); margin: 0 auto; padding: clamp(80px, 10vw, 150px) clamp(24px, 7vw, 104px) clamp(82px, 10vw, 135px); }
.page-hero h1, .studio-heading h1 { max-width: 1030px; margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(3.7rem, 8vw, 8.5rem); font-weight: 400; letter-spacing: -.06em; line-height: .94; }
.page-hero > p:last-child, .page-hero > h1 + p { max-width: 750px; margin: 36px 0 0; color: #3d464b; font-size: 1.12rem; line-height: 1.75; }

/* Learning studio */
.studio-page { width: min(1440px, 100%); margin: 0 auto; }
.studio-heading { display: grid; grid-template-columns: 1.25fr .75fr; gap: 60px; align-items: end; padding: 70px clamp(24px, 5vw, 76px) 52px; }
.studio-heading .eyebrow { grid-column: 1 / -1; margin-bottom: -30px; }
.studio-heading h1 { font-size: clamp(3.4rem, 6.5vw, 7rem); }
.studio-heading > p:last-child { margin: 0 0 8px; color: var(--muted); font-size: 1rem; line-height: 1.7; }
.studio-shell { display: grid; grid-template-columns: 220px minmax(440px, 1fr) 240px; min-height: 720px; margin: 0 clamp(24px, 3.5vw, 52px) 90px; border: 1px solid #343b41; background: var(--white); box-shadow: 14px 16px 0 var(--acid); }
.studio-controls { padding: 27px 22px; border-right: 1px solid var(--line); background: #ebeeea; }
.studio-controls label, .studio-controls legend { color: #424b51; font-size: .79rem; font-weight: 750; }
.studio-controls select { width: 100%; margin-top: 9px; padding: 11px; border: 1px solid #bfc5c2; border-radius: 2px; background: white; font: inherit; }
.studio-controls fieldset, .move-list { margin: 26px 0 0; padding: 0; border: 0; }
.studio-controls fieldset label { display: flex; gap: 8px; margin-top: 12px; font-weight: 500; }
.generate-button { width: 100%; margin-top: 26px; border: 0; cursor: pointer; }
.session-summary { margin-top: 40px; padding-top: 22px; border-top: 1px solid #c8cdca; }
.session-summary dl { margin: 15px 0 0; }
.session-summary dl div { display: flex; justify-content: space-between; padding: 9px 0; border-bottom: 1px solid #d3d7d4; }
.session-summary dt, .session-summary dd { margin: 0; font-size: .72rem; }
.session-summary dd { color: var(--muted); }
.session-summary .done { color: #19723a; }
.session-summary .active-status { color: var(--blue); font-weight: 750; }
.exercise-workspace { min-width: 0; }
.workspace-bar { min-height: 48px; display: flex; justify-content: space-between; align-items: center; padding: 0 28px; color: #cdd3d6; background: var(--deep); font-size: .74rem; }
.exercise-body { max-width: 800px; margin: 0 auto; padding: clamp(34px, 5vw, 64px); }
.task-type { margin: 0; color: var(--blue); font-size: .74rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.exercise-body > h2 { margin: 24px 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2rem, 3.5vw, 3.25rem); font-weight: 400; line-height: 1.12; }
.evidence-box { padding: 17px 19px; border-left: 3px solid var(--blue); background: #eef2fb; }
.evidence-box span { color: var(--blue); font-size: .7rem; font-weight: 800; letter-spacing: .05em; text-transform: uppercase; }
.evidence-box p { margin: 7px 0 0; line-height: 1.55; }
.move-list legend { margin-bottom: 12px; font-size: .9rem; font-weight: 800; }
.move-list label { display: grid; grid-template-columns: 22px 1fr; gap: 10px; align-items: start; margin-top: 9px; padding: 15px; border: 1px solid var(--line); cursor: pointer; }
.move-list label:has(input:checked) { border-color: var(--blue); box-shadow: inset 3px 0 var(--blue); background: #f5f8ff; }
.move-list input { margin-top: 4px; }
.move-list b, .move-list small { display: block; }
.move-list b { font-size: .9rem; }
.move-list small { margin-top: 4px; color: var(--muted); font-size: .79rem; line-height: 1.45; }
.workspace-actions { display: flex; align-items: center; gap: 16px; margin-top: 18px; }
.workspace-actions button { border: 0; cursor: pointer; }
.workspace-actions span { color: var(--muted); font-size: .78rem; }
.feedback-panel { margin-top: 20px; padding: 21px 22px; color: white; background: var(--deep); }
.feedback-label { margin: 0; color: var(--acid); font-size: .71rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.feedback-panel h3 { margin: 10px 0 8px; font-family: Georgia, "Times New Roman", serif; font-size: 1.35rem; font-weight: 400; }
.feedback-panel > p:not(.feedback-label) { margin: 0; color: #c6cdd0; line-height: 1.55; }
.text-button { margin-top: 16px; padding: 0; border: 0; border-bottom: 1px solid var(--acid); color: var(--acid); background: transparent; font: inherit; font-size: .8rem; font-weight: 750; cursor: pointer; }
.learner-panel { padding: 28px 22px; border-left: 1px solid var(--line); background: #f7f8f5; }
.learner-panel h2 { margin: 14px 0 38px; font-family: Georgia, "Times New Roman", serif; font-size: 1.65rem; font-weight: 400; }
.signal { margin-bottom: 27px; }
.signal > div:first-child { display: flex; justify-content: space-between; gap: 10px; }
.signal span, .signal strong { font-size: .72rem; }
.signal strong { color: var(--blue); }
.meter { height: 5px; margin-top: 9px; overflow: hidden; border-radius: 99px; background: #d9ddda; }
.meter i { height: 100%; display: block; background: var(--blue); transition: width 220ms ease; }
.privacy-note { margin-top: 45px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: .75rem; line-height: 1.55; }
.studio-disclaimer { max-width: 900px; margin: 0 auto 120px; padding: 25px 28px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--line); }
.studio-disclaimer strong { font-family: Georgia, "Times New Roman", serif; font-size: 1.2rem; font-weight: 400; }
.studio-disclaimer p { margin: 10px 0 0; color: var(--muted); line-height: 1.6; }

/* Model */
.model-hero { position: relative; border-bottom: 1px solid var(--line); }
.model-hero::after { content: "OBSERVE / MODEL / CHALLENGE / TRANSFER"; display: block; margin-top: 65px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--blue); font-size: .72rem; font-weight: 800; letter-spacing: .14em; word-spacing: 1.2em; }
.loop-diagram { margin: 72px 0 0; padding: 0; list-style: none; }
.loop-diagram li { display: grid; grid-template-columns: 100px 220px 1fr; gap: 28px; align-items: baseline; padding: 28px 0; border-top: 1px solid var(--line); }
.loop-diagram li:last-child { border-bottom: 1px solid var(--line); }
.loop-diagram > li > span { color: var(--blue); font-size: .75rem; font-weight: 800; }
.loop-diagram li div { display: contents; }
.loop-diagram h3, .loop-diagram p { margin: 0; }
.loop-diagram h3 { font-family: Georgia, "Times New Roman", serif; font-size: 2rem; font-weight: 400; }
.loop-diagram p { max-width: 650px; color: var(--muted); line-height: 1.65; }
.system-grid { grid-template-columns: repeat(2, 1fr); }
.system-grid .system-number { color: var(--acid); }
.system-grid h3 { margin-top: 26px; }
.system-grid ul { margin: 25px 0 0; padding: 0; list-style: none; }
.system-grid li { padding: 8px 0; border-top: 1px solid #414b53; color: #d2d8da; font-size: .82rem; }
.comparison { margin-top: 60px; border-top: 1px solid var(--ink); }
.comparison > div { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; padding: 18px 22px; border-bottom: 1px solid var(--line); }
.comparison .comparison-head { color: var(--blue); font-size: .75rem; font-weight: 800; letter-spacing: .05em; text-transform: uppercase; }
.comparison p { margin: 0; line-height: 1.55; }
.comparison div p:first-child { color: var(--muted); }
.comparison div p:last-child { font-weight: 700; }
.principle-grid, .thesis-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 55px; }
.principle-grid article, .thesis-grid article { padding: 28px; border: 1px solid var(--line); background: var(--white); }
.principle-grid h3, .thesis-grid h3 { margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: 1.45rem; font-weight: 400; }
.principle-grid p, .thesis-grid p { margin: 17px 0 0; color: var(--muted); line-height: 1.65; }

/* Evidence and roadmap */
.roadmap-hero { padding-bottom: 55px; }
.status-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 68px; padding-top: 18px; border-top: 1px solid var(--ink); }
.status-strip span { color: var(--muted); font-size: .78rem; font-weight: 700; }
.pilot-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 60px; border: 1px solid #46515a; background: #46515a; }
.pilot-grid article { display: flex; flex-direction: column; min-height: 365px; padding: 31px; background: var(--deep); }
.pilot-grid article > span { color: var(--acid); font-size: .74rem; font-weight: 800; }
.pilot-grid h3 { margin: 45px 0 15px; font-family: Georgia, "Times New Roman", serif; font-size: 1.55rem; font-weight: 400; }
.pilot-grid p { margin: 0; color: #b9c1c5; line-height: 1.6; }
.pilot-grid strong { margin-top: auto; padding-top: 30px; color: var(--acid); font-size: .72rem; letter-spacing: .05em; text-transform: uppercase; }
.pilot-grid small { margin-top: 8px; color: white; font-size: .85rem; }
.roadmap-list { margin: 60px 0 0; padding: 0; border-top: 1px solid var(--ink); list-style: none; }
.roadmap-list li { display: grid; grid-template-columns: 120px 1fr auto; gap: 35px; align-items: start; padding: 28px 0; border-bottom: 1px solid var(--line); }
.roadmap-list > li > span { color: var(--blue); font-size: .73rem; font-weight: 800; text-transform: uppercase; }
.roadmap-list h3, .roadmap-list p { margin: 0; }
.roadmap-list h3 { font-family: Georgia, "Times New Roman", serif; font-size: 1.35rem; font-weight: 400; }
.roadmap-list p { margin-top: 8px; color: var(--muted); line-height: 1.55; }
.roadmap-list b { padding: 5px 9px; border: 1px solid var(--line); border-radius: 99px; font-size: .68rem; text-transform: uppercase; }
.roadmap-list li:first-child b { border-color: var(--blue); color: white; background: var(--blue); }
.business-layout { display: grid; grid-template-columns: 1fr 330px; gap: 70px; margin-top: 55px; }
.business-layout h3 { margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: 2rem; font-weight: 400; }
.business-layout > div:first-child > p { max-width: 630px; color: var(--muted); line-height: 1.65; }
.business-layout dl { margin: 35px 0 0; }
.business-layout dl div { display: grid; grid-template-columns: 160px 1fr; padding: 13px 0; border-top: 1px solid var(--line); }
.business-layout dt { color: var(--muted); }
.business-layout dd { margin: 0; font-weight: 700; }
.economics-card { padding: 30px; color: white; background: var(--blue); }
.economics-card .card-index { color: white; opacity: .75; }
.economics-card strong, .economics-card span { display: block; }
.economics-card strong { margin-top: 50px; font-family: Georgia, "Times New Roman", serif; font-size: 3.2rem; font-weight: 400; }
.economics-card span { margin-top: 5px; }
.economics-card > p:last-child { margin: 45px 0 0; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.35); font-size: .78rem; line-height: 1.5; }
.risk-section { width: min(1440px, 100%); margin: 0 auto; padding: clamp(82px, 10vw, 144px) clamp(24px, 7vw, 104px); background: #e7e9e5; }
.risk-grid { display: grid; grid-template-columns: repeat(2, 1fr); margin-top: 55px; border-top: 1px solid var(--ink); }
.risk-grid article { padding: 27px 26px 30px 0; border-bottom: 1px solid #c3c8c4; }
.risk-grid article:nth-child(odd) { border-right: 1px solid #c3c8c4; }
.risk-grid article:nth-child(even) { padding-left: 26px; }
.risk-grid h3 { margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: 1.35rem; font-weight: 400; }
.risk-grid p { margin: 13px 0 0; color: var(--muted); line-height: 1.6; }

@media (max-width: 980px) {
  .site-header { grid-template-columns: 1fr auto; }
  .site-header nav { grid-column: 1 / -1; grid-row: 2; justify-content: space-between; border-top: 1px solid var(--line); }
  .site-header nav a { padding: 14px 0 16px; }
  .hero { grid-template-columns: 1fr; }
  .product-window { max-width: 760px; }
  .step-grid { grid-template-columns: 1fr 1fr; }
  .step-grid li:nth-child(2) { border-right: 0; }
  .step-grid li:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .value-grid, .metric-grid, .pilot-grid, .thesis-grid, .principle-grid { grid-template-columns: 1fr; }
  .studio-heading { grid-template-columns: 1fr; }
  .studio-heading .eyebrow { margin-bottom: -25px; }
  .studio-shell { grid-template-columns: 190px 1fr; }
  .learner-panel { grid-column: 1 / -1; border-top: 1px solid var(--line); border-left: 0; }
  .signal { max-width: 540px; }
  .business-layout { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .site-header { gap: 10px; padding-top: 14px; }
  .header-action { padding: 8px 11px; }
  .site-header nav { gap: 20px; overflow-x: auto; }
  .site-header nav a { white-space: nowrap; }
  .hero { padding-top: 58px; }
  .hero h1 { font-size: clamp(3rem, 15vw, 4.5rem); }
  .hero-actions { align-items: flex-start; flex-direction: column; }
  .hero-facts { grid-template-columns: 1fr; }
  .product-window { box-shadow: 9px 10px 0 var(--acid); transform: none; }
  .reasoning-map { grid-template-columns: 1fr 1fr; gap: 18px; }
  .reasoning-map div::before { display: none; }
  .statement { grid-template-columns: 1fr; }
  .site-footer { grid-template-columns: 1fr; }
  .site-footer .fine-print { grid-column: 1; }
  .step-grid { grid-template-columns: 1fr; }
  .step-grid li { min-height: 205px; border-right: 0; border-bottom: 1px solid var(--line); }
  .step-grid h3 { margin-top: 48px; }
  .metric-grid { grid-template-columns: 1fr; }
  .studio-shell { grid-template-columns: 1fr; margin-inline: 18px; box-shadow: 7px 8px 0 var(--acid); }
  .studio-controls { border-right: 0; border-bottom: 1px solid var(--line); }
  .session-summary { display: none; }
  .workspace-bar { padding-inline: 18px; }
  .exercise-body { padding: 28px 20px; }
  .workspace-actions { align-items: flex-start; flex-direction: column; }
  .learner-panel { grid-column: 1; }
  .loop-diagram li { grid-template-columns: 45px 1fr; }
  .loop-diagram li div { display: block; }
  .loop-diagram p { margin-top: 10px; }
  .system-grid { grid-template-columns: 1fr; }
  .comparison > div { grid-template-columns: 1fr; gap: 10px; }
  .comparison .comparison-head { display: none; }
  .status-strip { grid-template-columns: 1fr; }
  .roadmap-list li { grid-template-columns: 1fr; gap: 10px; }
  .roadmap-list b { justify-self: start; }
  .risk-grid { grid-template-columns: 1fr; }
  .risk-grid article:nth-child(odd) { border-right: 0; }
  .risk-grid article:nth-child(even) { padding-left: 0; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }