/* FitX AI site: the landing page (in index.html, shown to signed-out visitors) and the research pages.
   Everything is scoped under .lp so the app's own styles are untouched. Dark, editorial, product-led. */
.lp {
  --bg: #050506;
  --bg-2: #0A0A0C;
  --surface: #111114;
  --surface-2: #18181C;
  --ink: #F3F1EC;
  --ink-2: #C9C5BD;
  --ink-3: #8F8B83;
  --line: rgba(243, 241, 236, .08);
  --line-2: rgba(243, 241, 236, .16);
  --accent: #46C7AA;
  --accent-soft: rgba(70, 199, 170, .09);
  --accent-line: rgba(70, 199, 170, .35);
  --on-ink: #0A0A0B;
  --r7: #159A82; --r8: #C98A12; --r9: #D8611F; --r10: #E5434D; --rd: #5F7FA8;
  /* older names, still used by the research pages */
  --paper: var(--bg); --white: var(--surface); --muted: var(--ink-3); --dark: #000; --char: var(--surface);
  --on-dark: var(--ink); --on-dark-2: var(--ink-2); --dark-line: var(--line); --accent-on-dark: var(--accent);
  --radius: 18px;
  --radius-sm: 12px;
  --gutter: 32px;
  --section: clamp(120px, 15vw, 232px);
  --ease: cubic-bezier(.2, .7, .2, 1);
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --display: "Inter Tight", "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  color-scheme: dark;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  font-feature-settings: "cv11", "ss01";
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}
@media (max-width: 640px) { .lp { --gutter: 20px; font-size: 16px; } }
.lp *, .lp *::before, .lp *::after { box-sizing: border-box; }
/* resets at class weight, so section rules declared below win (and the app's bare h1/h2/p styles never apply) */
.lp :where(h1, h2, h3, h4, p, ul, ol, figure, blockquote, dl, dd) { margin: 0; }
.lp :where(ul, ol) { padding: 0; list-style: none; }
.lp :where(a) { color: inherit; text-decoration: none; }
.lp :where(img) { display: block; max-width: 100%; height: auto; }
.lp details { margin: 0; }
.lp summary { padding: 0; min-height: 0; font: inherit; color: inherit; background: none; border: 0; list-style: none; cursor: pointer; }
.lp summary::-webkit-details-marker { display: none; }
.lp summary::after { content: none; display: none; }
.lp :focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
.lp-skip { position: absolute; left: 12px; top: -60px; z-index: 100; background: var(--ink); color: var(--on-ink); padding: 10px 14px; border-radius: 8px; font-size: 14px; }
.lp-skip:focus { top: 12px; }
.lp-wrap { max-width: 1240px; margin: 0 auto; padding: 0 var(--gutter); }
.lp-narrow { max-width: 860px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.num { font-variant-numeric: tabular-nums; }

/* type */
.lp :where(h1, h2, h3) { font-family: var(--display); font-weight: 600; color: var(--ink); }
.display { font-size: clamp(46px, 8vw, 128px); line-height: .98; letter-spacing: -.045em; }
.h-xl, .lp h2.h2, .lp .h2 { font-size: clamp(38px, 5.6vw, 88px); line-height: 1.02; letter-spacing: -.042em; }
.lp :where(h3) { font-size: 21px; line-height: 1.25; letter-spacing: -.02em; }
.lp :where(h4) { font-size: 12px; line-height: 1.4; letter-spacing: .14em; text-transform: uppercase; font-weight: 600; color: var(--ink-3); }
.tone { color: var(--ink-3); }
.kicker, .lp-eyebrow { display: flex; align-items: center; gap: 12px; font-size: 13px; font-weight: 500; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 28px; }
.kicker::before, .lp-eyebrow::before { content: ""; width: 22px; height: 1px; background: var(--accent); }
.lead, .lp-lead { font-size: clamp(18px, 1.5vw, 21px); line-height: 1.55; color: var(--ink-2); max-width: 36em; margin-top: 32px; letter-spacing: -.005em; }
.sec { padding: var(--section) 0; position: relative; }
.sec-head { max-width: 980px; margin-bottom: clamp(64px, 8vw, 120px); }
.sec-head.center { text-align: center; margin-left: auto; margin-right: auto; }
.sec-head.center .kicker { justify-content: center; }
.lp-section { padding: var(--section) 0; }

/* buttons + links */
.lp-btn { -webkit-appearance: none; appearance: none; display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 54px; padding: 0 28px; border-radius: 999px; border: 1px solid var(--ink); background: var(--ink); color: var(--on-ink); font: 600 16px/1 var(--font); letter-spacing: -.01em; cursor: pointer; transition: transform .3s var(--ease), background .3s, color .3s, border-color .3s; }
.lp-btn:hover { transform: translateY(-1px); background: #fff; border-color: #fff; }
.lp-btn:disabled { opacity: .6; cursor: progress; transform: none; }
.lp-btn.ghost { background: transparent; color: var(--ink); border-color: var(--line-2); }
.lp-btn.ghost:hover { border-color: var(--ink); background: transparent; }
.lp a.lp-btn:not(.ghost) { color: var(--on-ink); }
.lp-btn.sm { min-height: 40px; padding: 0 18px; font-size: 14px; }
.lp-btn .arr { transition: transform .3s var(--ease); }
.lp-btn:hover .arr { transform: translateX(3px); }
.lp-ctas { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.lp-ctas.center { justify-content: center; }
.lp-msg { min-height: 24px; margin-top: 16px; font-size: 14px; color: var(--ink-3); }
.lp-msg.is-err { color: #FF7A83; }
.lp-link { display: inline-flex; gap: 8px; align-items: center; font-weight: 600; color: var(--ink); border-bottom: 1px solid var(--line-2); padding-bottom: 2px; transition: border-color .2s; }
.lp-link:hover { border-color: currentColor; }
.lp-tag { display: inline-flex; align-items: center; gap: 6px; height: 24px; padding: 0 10px; border-radius: 999px; font: 600 12px/1 var(--font); letter-spacing: .01em; white-space: nowrap; border: 1px solid var(--line-2); color: var(--ink-2); vertical-align: middle; }
.lp-tag.live { color: var(--accent); border-color: var(--accent-line); background: var(--accent-soft); }
.lp-tag.live::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.lp-tag.soon { color: var(--ink-3); border-style: dashed; }
.cite { display: inline-flex; align-items: center; height: 28px; padding: 0 11px; border-radius: 8px; background: var(--surface-2); border: 1px solid var(--line); font-size: 13px; color: var(--ink-2); transition: border-color .2s, color .2s; }
.cite:hover { border-color: var(--ink); color: var(--ink); }

/* nav: slim and transparent at the top, compact with a backdrop once scrolled */
.lp-nav { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid transparent; transition: background .35s, border-color .35s, backdrop-filter .35s; }
.lp-nav .lp-wrap { display: flex; align-items: center; gap: 28px; height: 72px; transition: height .35s var(--ease); }
.lp-nav.is-scrolled { background: rgba(5, 5, 6, .74); -webkit-backdrop-filter: saturate(1.5) blur(18px); backdrop-filter: saturate(1.5) blur(18px); border-bottom-color: var(--line); }
.lp-nav.is-scrolled .lp-wrap { height: 58px; }
.lp-brand { display: inline-flex; align-items: center; gap: 10px; font: 600 17px/1 var(--display); letter-spacing: -.02em; }
.lp-brand img { width: 28px; height: 28px; border-radius: 8px; }
.lp-nav .links { display: flex; gap: 30px; margin-left: auto; font-size: 14px; color: var(--ink-2); }
.lp-nav .links a { position: relative; padding: 6px 0; transition: color .2s; }
.lp-nav .links a:hover, .lp-nav .links a[aria-current] { color: var(--ink); }
.lp-nav .links a[aria-current]::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: currentColor; }
.lp-nav .actions { display: flex; gap: 10px; align-items: center; }
.lp-menu { display: none; position: relative; }
.lp-menu summary { display: grid; place-items: center; width: 44px; height: 44px; margin-right: -10px; border-radius: 10px; }
.lp-menu summary span, .lp-menu summary span::before, .lp-menu summary span::after { display: block; width: 18px; height: 1.5px; background: var(--ink); border-radius: 2px; position: relative; transition: transform .3s var(--ease), background .2s; }
.lp-menu summary span::before, .lp-menu summary span::after { content: ""; position: absolute; left: 0; }
.lp-menu summary span::before { top: -6px; }
.lp-menu summary span::after { top: 6px; }
.lp-menu[open] summary span { background: transparent; }
.lp-menu[open] summary span::before { transform: translateY(6px) rotate(45deg); }
.lp-menu[open] summary span::after { transform: translateY(-6px) rotate(-45deg); }
.lp-menu .lp-panel { position: fixed; left: 0; right: 0; top: 58px; bottom: 0; background: var(--bg); padding: 28px var(--gutter) 40px; display: flex; flex-direction: column; overflow-y: auto; }
.lp-menu .lp-panel a { font: 600 32px/1.2 var(--display); letter-spacing: -.04em; padding: 14px 0; border-bottom: 1px solid var(--line); }
.lp-menu .lp-panel .lp-btn { margin-top: 32px; }
@media (max-width: 900px) {
  .lp-nav .links { display: none; }
  .lp-nav .actions { margin-left: auto; }
  .lp-menu { display: block; }
  .lp-nav .lp-wrap, .lp-nav.is-scrolled .lp-wrap { height: 58px; }
}
@media (max-width: 380px) { .lp-nav .actions .lp-btn { padding: 0 14px; } }

/* phones (real screenshots) */
.phone { position: relative; padding: 10px; border-radius: 52px; background: #000; box-shadow: 0 0 0 1px rgba(243, 241, 236, .16), 0 0 0 7px rgba(243, 241, 236, .035), 0 60px 120px -40px rgba(0, 0, 0, .95); }
.phone .screen { position: relative; overflow: hidden; border-radius: 42px; aspect-ratio: 390 / 844; background: #0A0B0D; }
.phone .screen > img { width: 100%; height: 100%; object-fit: cover; object-position: top; }
.phone.xl { width: 380px; }
.phone.lg { width: 340px; }
.marks { position: absolute; inset: 0; pointer-events: none; }
.mark { position: absolute; width: 24px; height: 24px; margin: -12px 0 0 -12px; border-radius: 50%; background: var(--accent); color: #04130F; font: 700 12px/24px var(--font); text-align: center; box-shadow: 0 0 0 5px rgba(70, 199, 170, .2); }
.mark { left: 4.2%; }
.marks-legend { counter-reset: m; display: grid; gap: 10px; margin-top: 28px; }
.marks-legend li { counter-increment: m; display: flex; gap: 12px; align-items: center; font-size: 15px; color: var(--ink-2); }
.marks-legend li::before { content: counter(m); flex: none; width: 22px; height: 22px; border-radius: 50%; background: var(--accent); color: #04130F; font: 700 11px/22px var(--font); text-align: center; }

/* 1. hero */
.hero { position: relative; padding: clamp(40px, 5.5vw, 84px) 0 clamp(64px, 8vw, 120px); text-align: center; }
.hero::before { content: ""; position: absolute; left: 50%; top: 52%; width: min(1100px, 120vw); height: 900px; transform: translate(-50%, -20%); background: radial-gradient(closest-side, rgba(243, 241, 236, .07), transparent 70%); pointer-events: none; }
.hero-copy { position: relative; }
.hero .kicker { justify-content: center; }
.hero h1 { max-width: 11.5em; margin: 0 auto; }
.hero-sub { max-width: 30em; margin: 30px auto 0; font-size: clamp(19px, 1.9vw, 25px); line-height: 1.4; letter-spacing: -.015em; color: var(--ink-2); }
.hero .lp-ctas { justify-content: center; margin-top: 36px; }
.hero-stage { position: relative; height: 880px; max-width: 1240px; margin: clamp(40px, 4vw, 64px) auto 0; }
.hero-phone { position: absolute; left: 50%; top: 0; transform: translateX(-50%); will-change: transform; }
.hc { position: absolute; width: 260px; padding: 20px 22px; text-align: left; background: rgba(17, 17, 20, .92); border: 1px solid var(--line-2); border-radius: 20px; box-shadow: 0 30px 60px -30px rgba(0, 0, 0, .9); }
.hc-k { display: block; font-size: 11px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
.hc b { display: block; margin-top: 8px; font: 600 28px/1.1 var(--display); letter-spacing: -.035em; color: var(--ink); font-variant-numeric: tabular-nums; }
.hc-s { display: block; margin-top: 8px; font-size: 13px; color: var(--ink-3); }
.hc-phase { left: calc(50% - 520px); top: 120px; }
.hc-effort { left: calc(50% - 470px); top: 420px; }
.hc-target { right: calc(50% - 520px); top: 90px; }
.hc-e1rm { right: calc(50% - 470px); top: 400px; }
.ladder { display: flex; gap: 6px; margin-top: 14px; }
.ladder i { flex: 1; height: 30px; border-radius: 7px; border: 1px solid var(--line-2); font: 600 12px/28px var(--font); font-style: normal; text-align: center; color: var(--ink-3); transition: background .5s, color .5s, border-color .5s; }
.ladder i:nth-child(1) { --c: var(--r7); } .ladder i:nth-child(2) { --c: var(--r8); } .ladder i:nth-child(3) { --c: var(--r9); } .ladder i:nth-child(4) { --c: var(--r10); } .ladder i:nth-child(5) { --c: var(--rd); }
.ladder i.on { background: color-mix(in srgb, var(--c) 22%, transparent); border-color: transparent; color: var(--ink-2); }
.ladder i.cur { background: var(--c); border-color: var(--c); color: #fff; }
.dots { display: flex; gap: 6px; margin-top: 12px; }
.dots i { width: 28px; height: 6px; border-radius: 3px; background: var(--line-2); }
.dots i.on { background: var(--accent); }
.dots i.cur { background: var(--ink); animation: lp-blink 2.4s var(--ease) infinite; }
@keyframes lp-blink { 50% { opacity: .35; } }
.hc svg { display: block; width: 100%; height: 46px; margin-top: 12px; overflow: visible; }
.hc .spark { fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.hc svg circle { fill: var(--accent); }
.hero-cred { position: relative; text-align: center; font-size: 14px; color: var(--ink-3); letter-spacing: .02em; margin-top: 8px; }
@media (max-width: 1180px) {
  .hc-phase { left: 2%; } .hc-effort { left: 0; } .hc-target { right: 2%; } .hc-e1rm { right: 0; }
  .hc { width: 230px; }
}
@media (max-width: 960px) {
  .hero-stage { height: auto; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; padding: 0 var(--gutter); }
  .hero-phone { position: relative; left: auto; transform: none; grid-column: 1 / -1; justify-self: center; margin-bottom: 20px; }
  .hc { position: relative; inset: auto; width: auto; padding: 16px 18px; }
  .hc b { font-size: 22px; }
}
@media (max-width: 640px) {
  .phone.xl { width: min(310px, 78vw); }
  .hc-k { font-size: 10px; letter-spacing: .1em; }
  .hc b { font-size: 19px; }
  .ladder i { height: 24px; line-height: 22px; font-size: 11px; }
  .hero-sub { margin-top: 26px; }
}

/* 2. opening statement */
.statement-open { padding: var(--section) 0; }
.big-statement { font: 600 clamp(40px, 6.4vw, 104px)/1.04 var(--display); letter-spacing: -.045em; max-width: 13em; }
.statement-follow { max-width: 28em; margin-top: clamp(40px, 5vw, 72px); margin-left: auto; font-size: clamp(19px, 1.8vw, 24px); line-height: 1.45; color: var(--ink-2); letter-spacing: -.01em; }

/* 3. the connected system */
.sys-map { position: relative; height: 760px; max-width: 1100px; margin: 0 auto; }
.sys-lines { position: absolute; left: 50%; top: 50%; width: 620px; height: 620px; transform: translate(-50%, -50%); overflow: visible; }
.sys-ring { fill: none; stroke: var(--line-2); stroke-width: 1; }
.sys-spokes line { stroke: var(--line); stroke-width: 1; stroke-dasharray: 4 6; }
.sys-dots circle { fill: var(--bg); stroke: var(--accent); stroke-width: 1.5; }
.sys-pulse { fill: var(--accent); }
.lp-js .sys-map:not(.is-in) .sys-ring { stroke-dasharray: 1400; stroke-dashoffset: 1400; }
.sys-ring { stroke-dasharray: 1400; stroke-dashoffset: 0; transition: stroke-dashoffset 2.2s var(--ease); }
.sys-core { position: absolute; left: 50%; top: 50%; width: 168px; height: 168px; transform: translate(-50%, -50%); display: grid; place-items: center; border-radius: 50%; background: var(--surface); border: 1px solid var(--line-2); box-shadow: 0 0 0 14px rgba(243, 241, 236, .025), 0 0 0 28px rgba(243, 241, 236, .015); }
.sys-core span { font: 600 26px/1 var(--display); letter-spacing: -.04em; }
.sys-nodes li { position: absolute; width: 250px; transition: opacity .9s var(--ease), transform .9s var(--ease); }
.sys-nodes h3 { font-size: 22px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.sys-nodes p { margin-top: 6px; font-size: 15px; line-height: 1.5; color: var(--ink-3); }
.sys-nodes .n1 { left: 50%; top: 50%; transform: translate(-50%, calc(-100% - 266px)); text-align: center; }
.sys-nodes .n1 h3 { justify-content: center; }
.sys-nodes .n4 { left: 50%; top: 50%; transform: translate(-50%, 266px); text-align: center; }
.sys-nodes .n4 h3 { justify-content: center; }
.sys-nodes .n2 { left: calc(50% + 236px); top: calc(50% - 123px); transform: translateY(-50%); }
.sys-nodes .n3 { left: calc(50% + 236px); top: calc(50% + 123px); transform: translateY(-50%); }
.sys-nodes .n6 { right: calc(50% + 236px); top: calc(50% - 123px); transform: translateY(-50%); text-align: right; }
.sys-nodes .n5 { right: calc(50% + 236px); top: calc(50% + 123px); transform: translateY(-50%); text-align: right; }
.sys-nodes .n5 h3, .sys-nodes .n6 h3 { justify-content: flex-end; }
.lp-js .sys-map:not(.is-in) .sys-nodes li { opacity: 0; }
.sys-map .sys-nodes li:nth-child(2) { transition-delay: .1s; } .sys-map .sys-nodes li:nth-child(3) { transition-delay: .2s; } .sys-map .sys-nodes li:nth-child(4) { transition-delay: .3s; } .sys-map .sys-nodes li:nth-child(5) { transition-delay: .4s; } .sys-map .sys-nodes li:nth-child(6) { transition-delay: .5s; }
.sys-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: clamp(48px, 6vw, 88px); }
.sys-links li { display: inline-flex; align-items: center; gap: 10px; padding: 10px 16px; border-radius: 999px; border: 1px solid var(--line); font-size: 14px; color: var(--ink-3); }
.sys-links b { color: var(--ink); font-weight: 600; }
.sys-links span { color: var(--accent); }
@media (max-width: 960px) {
  .sys-map { height: auto; }
  .sys-lines { position: relative; left: auto; top: auto; transform: none; display: block; width: min(300px, 80vw); height: auto; margin: 0 auto; }
  .sys-core { top: calc(min(300px, 80vw) / 2); width: 96px; height: 96px; }
  .sys-core span { font-size: 17px; }
  .sys-nodes { display: grid; grid-template-columns: 1fr 1fr; gap: 28px 20px; margin-top: 48px; }
  .sys-nodes li, .sys-nodes .n1, .sys-nodes .n2, .sys-nodes .n3, .sys-nodes .n4, .sys-nodes .n5, .sys-nodes .n6 { position: static; width: auto; transform: none; text-align: left; padding-top: 16px; border-top: 1px solid var(--line); }
  .sys-nodes li h3 { justify-content: flex-start !important; }
}
@media (max-width: 560px) { .sys-nodes { grid-template-columns: 1fr; } }

/* 4. built on science: principle chains */
.chains { border-top: 1px solid var(--line); }
.chain { display: grid; grid-template-columns: minmax(200px, 270px) minmax(0, 1fr); gap: 20px 48px; padding: 44px 0; border-bottom: 1px solid var(--line); }
.chain-head { display: flex; flex-direction: column; gap: 10px; align-items: flex-start; }
.chain-i { font: 500 13px/1 var(--font); color: var(--ink-3); font-variant-numeric: tabular-nums; letter-spacing: .08em; }
.chain-head h3 { font-size: clamp(24px, 2.2vw, 30px); letter-spacing: -.035em; line-height: 1.1; }
.chain-steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; }
.chain-steps li { position: relative; padding: 0 28px 0 0; }
.chain-steps li + li { padding-left: 28px; border-left: 1px solid var(--line); }
.chain-steps li + li::before { content: "→"; position: absolute; left: -9px; top: -2px; width: 18px; text-align: center; background: var(--bg); color: var(--accent); font-size: 13px; line-height: 18px; }
.cs-k { display: block; font-size: 11px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 12px; }
.chain-steps p { font-size: 15px; line-height: 1.5; color: var(--ink-2); }
.chain-steps .cs-out p { color: var(--ink); font-weight: 500; }
.cs-cites { display: flex; flex-wrap: wrap; gap: 6px; }
.chain-more { grid-column: 2; }
.chain-more summary { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 600; color: var(--ink-2); }
.chain-more summary::before { content: "+"; display: grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; border: 1px solid var(--line-2); font-weight: 400; transition: transform .3s var(--ease); }
.chain-more[open] summary::before { transform: rotate(45deg); }
.chain-more summary:hover { color: var(--ink); }
.chain-full { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; margin-top: 22px; padding: 26px 28px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line); }
.chain-full p { margin-top: 10px; font-size: 15px; line-height: 1.6; color: var(--ink-2); }
.chain.soon .chain-steps p { color: var(--ink-3); }
.more-principles { margin-top: 28px; }
.more-principles > summary { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 30px 0; border-bottom: 1px solid var(--line); font: 600 clamp(22px, 2.2vw, 30px)/1.2 var(--display); letter-spacing: -.03em; }
.plus { position: relative; flex: none; width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--line-2); transition: transform .35s var(--ease); }
.plus::before, .plus::after { content: ""; position: absolute; left: 50%; top: 50%; width: 14px; height: 1.5px; background: var(--ink); transform: translate(-50%, -50%); }
.plus::after { transform: translate(-50%, -50%) rotate(90deg); }
details[open] > summary .plus { transform: rotate(45deg); }
.more-principles .chains { border-top: 0; }
@media (max-width: 1000px) {
  .chain { grid-template-columns: 1fr; }
  .chain-more { grid-column: 1; }
  .chain-steps { grid-template-columns: 1fr 1fr; gap: 28px 0; }
  .chain-steps li:nth-child(3) { padding-left: 0; border-left: 0; }
  .chain-steps li:nth-child(3)::before { display: none; }
}
@media (max-width: 600px) {
  .chain { padding: 36px 0; }
  .chain-steps { grid-template-columns: 1fr; gap: 0; }
  .chain-steps li, .chain-steps li + li { padding: 0 0 22px 22px; border-left: 1px solid var(--line); }
  .chain-steps li:nth-child(3) { padding-left: 22px; border-left: 1px solid var(--line); }
  .chain-steps li::before, .chain-steps li + li::before, .chain-steps li:nth-child(3)::before { content: ""; display: block; position: absolute; left: -4px; top: 3px; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
  .chain-steps li:last-child { padding-bottom: 0; }
  .chain-full { grid-template-columns: 1fr; gap: 20px; padding: 22px; }
}

/* 5. research as a product feature */
.rs-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; margin-bottom: clamp(72px, 8vw, 120px); }
.rs-stats > div { display: flex; flex-direction: column-reverse; justify-content: flex-end; gap: 14px; padding-top: 24px; border-top: 1px solid var(--line-2); }
.rs-stats dd { font: 600 clamp(56px, 6.4vw, 104px)/.92 var(--display); letter-spacing: -.05em; white-space: nowrap; color: var(--ink); font-variant-numeric: tabular-nums; }
.rs-stats dt { font-size: 15px; color: var(--ink-3); max-width: 14em; }
@media (max-width: 800px) { .rs-stats { grid-template-columns: 1fr 1fr; gap: 40px 20px; } }
.rs-rail-wrap { position: relative; }
.rs-rail { display: flex; gap: 18px; overflow-x: auto; scroll-snap-type: x mandatory; scroll-padding: 0 var(--gutter); margin: 0 calc(50% - 50vw) 0 calc(var(--gutter) * -1); padding: 6px var(--gutter) 28px; scrollbar-width: none; }
.rs-rail::-webkit-scrollbar { display: none; }
.rs-rail .paper { flex: 0 0 min(400px, 84vw); scroll-snap-align: start; }
.rs-more { flex: 0 0 min(300px, 70vw); scroll-snap-align: start; display: flex; flex-direction: column; justify-content: space-between; padding: 30px; border-radius: 22px; border: 1px dashed var(--line-2); font: 600 30px/1.1 var(--display); letter-spacing: -.035em; transition: border-color .3s, background .3s; }
.rs-more:hover { border-color: var(--ink); background: var(--surface); }
.rs-more .arr { font-size: 36px; color: var(--accent); }
.rail-ctrl { display: flex; gap: 10px; justify-content: flex-end; margin-top: 8px; }
.rail-btn { -webkit-appearance: none; appearance: none; width: 48px; height: 48px; border-radius: 50%; border: 1px solid var(--line-2); background: transparent; color: var(--ink); font-size: 18px; cursor: pointer; transition: border-color .2s, background .2s; }
.rail-btn:hover { border-color: var(--ink); background: var(--surface); }
.rail-btn:disabled { opacity: .3; cursor: default; }
@media (hover: none), (max-width: 700px) { .rail-ctrl { display: none; } }
.rs-note { margin-top: 36px; max-width: 46em; font-size: 15px; color: var(--ink-3); }
.rs-note .lp-link { margin-left: 6px; font-size: 15px; }

/* paper cards (landing rail and /research/) */
.papers { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.paper { display: flex; flex-direction: column; gap: 14px; padding: 28px 28px 22px; border-radius: 22px; background: var(--surface); border: 1px solid var(--line); transition: border-color .35s, transform .5s var(--ease), background .35s; }
.paper:hover { border-color: var(--line-2); background: var(--surface-2); }
.pc-top { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.pc-type { font-size: 11px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }
.pc-year { font: 500 13px/1 var(--font); color: var(--ink-3); font-variant-numeric: tabular-nums; }
.pc-topic { font-size: 13px; color: var(--ink-3); margin-top: -6px; }
.paper h3 { font-size: 20px; line-height: 1.28; letter-spacing: -.02em; }
.paper h3 a { background-image: linear-gradient(currentColor, currentColor); background-size: 0 1px; background-position: 0 100%; background-repeat: no-repeat; transition: background-size .35s var(--ease); }
.paper h3 a:hover { background-size: 100% 1px; }
.pc-by { font-size: 13px; line-height: 1.45; color: var(--ink-3); }
.pc-by span { color: var(--ink-3); }
.pc-k { display: block; font-size: 11px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 6px; }
.pc-find { font-size: 15px; line-height: 1.55; color: var(--ink-2); }
.pc-use { font-size: 14px; line-height: 1.5; color: var(--ink-2); padding: 14px 16px; border-radius: 14px; background: var(--accent-soft); }
.pc-use .pc-k { color: var(--accent); }
.pc-links { margin-top: auto; padding-top: 14px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: 13px; font-weight: 600; }
.pc-links a { color: var(--ink-2); transition: color .2s; }
.pc-links a:hover { color: var(--ink); }
.pc-links a:last-child { margin-left: auto; color: var(--ink); }
@media (max-width: 1000px) { .papers { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) { .papers { grid-template-columns: 1fr; } .paper { padding: 24px 22px 18px; } }

/* 6. signature: from research to your next session */
.flow { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(48px, 7vw, 120px); align-items: center; }
.flow-label { font-size: 12px; font-weight: 600; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); margin-bottom: 32px; }
.flow-steps li { position: relative; display: grid; grid-template-columns: 52px 1fr; gap: 0 22px; padding-bottom: 34px; opacity: .32; transition: opacity .6s var(--ease); }
.flow-steps li::before { content: ""; position: absolute; left: 25px; top: 52px; bottom: 6px; width: 1px; background: var(--line-2); }
.flow-steps li:last-child { padding-bottom: 0; }
.flow-steps li:last-child::before { display: none; }
.flow-steps li.on { opacity: 1; }
.fs-n { display: grid; place-items: center; width: 52px; height: 52px; border-radius: 50%; border: 1px solid var(--line-2); font: 600 14px/1 var(--font); font-variant-numeric: tabular-nums; transition: background .5s, color .5s, border-color .5s; }
.flow-steps li.on .fs-n { background: var(--ink); color: var(--on-ink); border-color: var(--ink); }
.flow-steps h3 { font-size: clamp(22px, 2vw, 28px); letter-spacing: -.035em; margin-top: 10px; }
.flow-steps p { margin-top: 4px; font-size: 15px; color: var(--ink-3); }
.loop { position: relative; width: min(480px, 100%); aspect-ratio: 1; margin: 64px auto 0; }
.loop svg { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.loop-track { fill: none; stroke: var(--line-2); stroke-width: 1; }
.loop-run { fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; stroke-dasharray: 120 684; transform-origin: 160px 160px; animation: lp-orbit 9s linear infinite; }
@keyframes lp-orbit { to { transform: rotate(360deg); } }
.loop::after { content: "Repeats every session"; position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); width: 9em; text-align: center; font: 600 clamp(18px, 1.8vw, 24px)/1.15 var(--display); letter-spacing: -.03em; color: var(--ink-2); }
.loop-nodes li { position: absolute; width: 200px; padding: 18px 20px; border-radius: 18px; background: var(--surface); border: 1px solid var(--line-2); }
.loop-nodes h3 { font-size: 19px; }
.loop-nodes p { margin-top: 4px; font-size: 14px; line-height: 1.45; color: var(--ink-3); }
.loop-nodes .l1 { left: 50%; top: 0; transform: translate(-50%, -30%); }
.loop-nodes .l2 { right: -6%; bottom: 8%; }
.loop-nodes .l3 { left: -6%; bottom: 8%; }
@media (max-width: 900px) {
  .flow { grid-template-columns: 1fr; }
  .loop { width: min(420px, 100%); margin-top: 40px; }
  .loop-nodes li { width: 170px; padding: 14px 16px; }
  .loop-nodes .l2 { right: 0; } .loop-nodes .l3 { left: 0; }
}
@media (max-width: 480px) { .loop-nodes li { width: 148px; } .loop-nodes h3 { font-size: 16px; } .loop-nodes p { font-size: 12.5px; } }

/* 7. not a chatbot: a real decision */
.dec { display: grid; grid-template-columns: 1.1fr .9fr 1fr 1.1fr 1fr; gap: 0; align-items: stretch; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.dec li { position: relative; padding: 36px 28px; display: flex; flex-direction: column; gap: 10px; }
.dec li + li { border-left: 1px solid var(--line); }
.dec li + li::before { content: "→"; position: absolute; left: -10px; top: 50%; width: 20px; height: 20px; margin-top: -10px; border-radius: 50%; background: var(--bg); color: var(--accent); font-size: 13px; line-height: 20px; text-align: center; }
.dec-k { font-size: 11px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
.dec-card { background: var(--surface); }
.dec-next { background: linear-gradient(var(--accent-soft), var(--accent-soft)), var(--surface); }
.dec-num { font: 600 clamp(28px, 2.6vw, 40px)/1 var(--display); letter-spacing: -.04em; font-variant-numeric: tabular-nums; white-space: nowrap; }
.dec-next .dec-num { color: var(--accent); }
.dec p { font-size: 17px; line-height: 1.45; color: var(--ink); }
.dec-mid { font: 600 24px/1.15 var(--display) !important; letter-spacing: -.03em; }
.dec-s { font-size: 14px; line-height: 1.45; color: var(--ink-3); }
.dec .cs-cites { margin-top: 4px; }
.dec-note { margin-top: 22px; font-size: 14px; color: var(--ink-3); max-width: 50em; }
.lp-js .dec[data-steps]:not(.is-in) li { opacity: 0; transform: translateY(10px); }
.dec[data-steps] li { transition: opacity .7s var(--ease), transform .7s var(--ease); }
.dec li:nth-child(2) { transition-delay: .15s; } .dec li:nth-child(3) { transition-delay: .3s; } .dec li:nth-child(4) { transition-delay: .45s; } .dec li:nth-child(5) { transition-delay: .6s; }
@media (max-width: 1000px) {
  .dec { grid-template-columns: 1fr; border: 0; }
  .dec li { padding: 26px 24px; border: 1px solid var(--line); border-radius: var(--radius); }
  .dec li + li { border-left: 1px solid var(--line); margin-top: 26px; }
  .dec li + li::before { content: "↓"; left: 50%; top: -24px; margin: 0 0 0 -10px; }
}

/* 8. product story: steps scroll, the phone stays */
.story { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(40px, 6vw, 96px); }
.story-step { min-height: 82vh; display: flex; flex-direction: column; justify-content: center; max-width: 30em; transition: opacity .6s var(--ease); }
.story-step h3 { font-size: clamp(34px, 3.6vw, 56px); line-height: 1.02; letter-spacing: -.045em; }
.story-step > p:not(.kicker) { margin-top: 22px; font-size: 18px; line-height: 1.55; color: var(--ink-2); }
.story-step .kicker { margin-bottom: 20px; }
.lp-js .story-step:not(.on) { opacity: .25; }
.story-inline { display: none; }
.story-stage { position: relative; }
.story-stage .story-phone { position: sticky; top: calc(50vh - min(400px, (100vh - 120px) / 2)); width: min(380px, calc((100vh - 140px) * 390 / 864)); margin: 0 auto; }
.story-phone .screen > img { position: absolute; inset: 0; opacity: 0; transition: opacity .7s var(--ease); }
.story-phone .screen > img.is-on { opacity: 1; }
.story-phone .marks { opacity: 0; transition: opacity .5s var(--ease); }
.story-phone .marks.is-on { opacity: 1; }
.lp-real { display: inline-flex; gap: 10px; align-items: center; font-size: 13px; color: var(--ink-3); margin-top: 48px; }
.lp-real::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
@media (max-width: 960px) {
  .story { grid-template-columns: 1fr; }
  .story-stage { display: none; }
  .story-step { min-height: 0; max-width: none; padding: 0 0 clamp(72px, 12vw, 120px); }
  .lp-js .story-step:not(.on) { opacity: 1; }
  .story-inline { display: block; margin-top: 40px; }
  .story-inline .phone.lg { width: min(340px, 82vw); margin: 0 auto; }
}

/* 9. training timeline */
.tl { position: relative; }
.tl-rail { position: absolute; left: 0; right: 0; top: 11px; height: 1px; background: var(--line-2); }
.tl-fill { position: absolute; inset: 0; background: var(--accent); transform-origin: left; transform: scaleX(var(--p, 1)); }
.tl-stages { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 18px; }
.tl-stages li { position: relative; padding-top: 44px; display: flex; flex-direction: column; opacity: .28; transition: opacity .6s var(--ease); }
.tl-stages li::before { content: ""; position: absolute; left: 0; top: 4px; width: 15px; height: 15px; border-radius: 50%; background: var(--bg); border: 1px solid var(--line-2); transition: background .5s, border-color .5s; }
.tl-stages li.on { opacity: 1; }
.tl-stages li.on::before { background: var(--c); border-color: var(--c); }
.tl-w { font-size: 12px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
.tl-rpe { font: 600 clamp(26px, 2.6vw, 40px)/1.05 var(--display); letter-spacing: -.04em; margin-top: 8px; white-space: nowrap; }
.tl-next .tl-rpe { white-space: normal; color: var(--ink-3); }
.tl-bar { display: block; height: 180px; margin: 22px 0 22px; position: relative; }
.tl-bar::after { content: ""; position: absolute; left: 0; right: 30%; bottom: 0; height: calc(var(--h) * 100%); border-radius: 12px 12px 4px 4px; background: var(--c); transform-origin: bottom; transform: scaleY(.04); transition: transform 1s var(--ease); }
.tl-stages li.on .tl-bar::after { transform: none; }
.tl-next .tl-bar::after { background: transparent; border: 1px dashed var(--line-2); }
.tl-stages h3 { font-size: 21px; }
.tl-stages p { margin-top: 6px; font-size: 14px; line-height: 1.5; color: var(--ink-3); }
@media (max-width: 960px) {
  .tl-rail { left: 7px; right: auto; top: 0; bottom: 0; width: 1px; height: auto; }
  .tl-fill { transform-origin: top; transform: scaleY(var(--p, 1)); }
  .tl-stages { grid-template-columns: 1fr; gap: 0; }
  .tl-stages li { display: grid; grid-template-columns: 96px 1fr; gap: 2px 18px; padding: 0 0 34px 40px; }
  .tl-stages li::before { top: 3px; }
  .tl-w { grid-column: 1; } .tl-rpe { grid-column: 1; font-size: 26px; margin: 0; }
  .tl-bar { grid-column: 1; grid-row: 3; height: 14px; margin: 10px 0 0; }
  .tl-bar::after { right: auto; top: 0; width: calc(var(--h) * 100%); height: 100%; border-radius: 4px 8px 8px 4px; transform-origin: left; transform: scaleX(.04); }
  .tl-stages h3 { grid-column: 2; grid-row: 1 / span 2; align-self: end; }
  .tl-stages p { grid-column: 2; grid-row: 3; margin: 0; }
}
.terms { margin-top: clamp(56px, 7vw, 96px); border-top: 1px solid var(--line); }
.terms > summary { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 28px 0; font: 600 clamp(20px, 2vw, 26px)/1.2 var(--display); letter-spacing: -.03em; }
.terms-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0 32px; padding-bottom: 12px; }
.terms-grid div { padding: 22px 0; border-top: 1px solid var(--line); }
.terms-grid dt { font-weight: 600; font-size: 16px; margin-bottom: 6px; }
.terms-grid dd { font-size: 15px; color: var(--ink-3); line-height: 1.5; }
@media (max-width: 960px) { .terms-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .terms-grid { grid-template-columns: 1fr; } }

/* 10. nutrition */
.nu-grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: clamp(48px, 7vw, 120px); align-items: start; }
.nu-grid .sec-head { margin-bottom: 0; position: sticky; top: 120px; }
.soon-line { display: flex; gap: 14px; align-items: flex-start; margin-top: 36px; font-size: 14px; color: var(--ink-3); max-width: 30em; }
.calc { padding: clamp(28px, 3.4vw, 44px); border-radius: 28px; background: var(--surface); border: 1px solid var(--line-2); }
.calc-k { font-size: 12px; font-weight: 600; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); }
.calc-who { margin-top: 10px; font-size: 15px; color: var(--ink-3); }
.calc-rows { margin-top: 28px; }
.calc-rows li { display: grid; grid-template-columns: 110px minmax(0, 1fr) auto; gap: 4px 18px; align-items: baseline; padding: 18px 0; border-top: 1px solid var(--line); }
.cr-l { font-weight: 600; font-size: 16px; }
.cr-d { font-size: 14px; color: var(--ink-3); }
.calc-rows b { font: 600 22px/1 var(--display); letter-spacing: -.03em; font-variant-numeric: tabular-nums; white-space: nowrap; text-align: right; }
.cr-sum { border-top-color: var(--line-2) !important; }
.cr-total { border-top: 1px solid var(--ink) !important; padding-top: 24px !important; }
.cr-total .cr-l { font-size: 18px; }
.cr-total b { font-size: clamp(40px, 4.4vw, 60px); letter-spacing: -.05em; color: var(--accent); }
.cr-total b small { font: 500 16px var(--font); color: var(--ink-3); letter-spacing: 0; }
.calc-after { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 24px; }
.calc-after li { position: relative; padding: 16px 18px; border-radius: 14px; border: 1px dashed var(--line-2); font-size: 14px; color: var(--ink-3); }
.calc-after li + li::before { content: "→"; position: absolute; left: -12px; top: 50%; transform: translateY(-50%); color: var(--accent); background: var(--surface); }
.calc-after b { display: block; color: var(--ink); font-size: 15px; margin-bottom: 2px; }
@media (max-width: 960px) { .nu-grid { grid-template-columns: 1fr; } .nu-grid .sec-head { position: static; margin-bottom: 48px; } }
@media (max-width: 560px) {
  .calc-rows li { grid-template-columns: 1fr auto; }
  .cr-d { grid-column: 1 / -1; grid-row: 2; }
  .calc-after { grid-template-columns: 1fr; }
  .calc-after li + li::before { content: "↓"; left: 50%; top: -14px; transform: translateX(-50%); }
}

/* 11. comparison */
.vs { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); max-width: 1040px; margin: 0 auto; border-radius: 28px; overflow: hidden; border: 1px solid var(--line); }
.vs-col { padding: clamp(28px, 4vw, 52px); }
.vs-col h3 { font-size: 13px; font-family: var(--font); font-weight: 600; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 18px; }
.vs-col li { min-height: 86px; display: flex; flex-direction: column; justify-content: center; border-top: 1px solid var(--line); padding: 14px 0; }
.vs-old li { font-size: 19px; color: var(--ink-3); }
.vs-new { background: var(--surface); }
.vs-new h3 { color: var(--accent); }
.vs-new b { font: 600 22px/1.2 var(--display); letter-spacing: -.025em; color: var(--ink); }
.vs-new span { font-size: 14px; color: var(--ink-3); margin-top: 4px; }
@media (max-width: 760px) {
  .vs { grid-template-columns: 1fr; }
  .vs-old ul { display: flex; flex-wrap: wrap; gap: 8px; }
  .vs-old li { min-height: 0; border: 1px solid var(--line); border-radius: 999px; padding: 6px 12px; font-size: 14px; }
  .vs-new li { min-height: 0; padding: 16px 0; }
}

/* 12. transparency: inspect a real decision */
.insp-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 28px; }
.insp-tab { -webkit-appearance: none; appearance: none; height: 40px; padding: 0 18px; border-radius: 999px; border: 1px solid var(--line-2); background: transparent; color: var(--ink-2); font: 500 14px/1 var(--font); cursor: pointer; transition: background .25s, color .25s, border-color .25s; }
.insp-tab:hover { border-color: var(--ink); color: var(--ink); }
.insp-tab[aria-selected="true"] { background: var(--ink); color: var(--on-ink); border-color: var(--ink); }
.insp-panel { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 20px; }
.insp-panel[hidden] { display: none; }
.insp-card { padding: clamp(28px, 3.4vw, 44px); border-radius: 28px; background: var(--surface); border: 1px solid var(--line-2); display: flex; flex-direction: column; gap: 18px; }
.insp-k { font-size: 12px; font-weight: 600; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3); }
.insp-change { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 16px; font: 600 clamp(30px, 3.6vw, 52px)/1.05 var(--display); letter-spacing: -.045em; font-variant-numeric: tabular-nums; }
.insp-from { color: var(--ink-3); text-decoration: line-through; text-decoration-thickness: 2px; text-decoration-color: var(--line-2); }
.to-arr { color: var(--accent); font-size: .7em; }
.insp-to { color: var(--ink); }
.insp-raw { margin-top: auto; padding: 16px 18px; border-radius: 14px; background: var(--bg-2); border: 1px solid var(--line); font-size: 15px; line-height: 1.5; color: var(--ink-2); }
.insp-raw span { display: block; margin-top: 8px; font-size: 12px; color: var(--ink-3); }
.insp-steps { display: grid; gap: 12px; align-content: start; }
.insp-steps li { border-radius: 22px; border: 1px solid var(--line); padding: 20px 22px; transition: border-color .3s, background .3s; }
.insp-steps li.is-open { border-color: var(--line-2); background: var(--surface); }
.insp-q { -webkit-appearance: none; appearance: none; display: inline-flex; align-items: center; gap: 10px; padding: 0; border: 0; background: none; color: var(--ink); font: 600 20px/1.2 var(--display); letter-spacing: -.02em; cursor: pointer; }
.insp-q::before { content: "+"; display: grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; border: 1px solid var(--line-2); font: 400 16px/1 var(--font); color: var(--accent); transition: transform .3s var(--ease); }
.insp-q[aria-expanded="true"]::before { transform: rotate(45deg); }
.insp-q:disabled { color: var(--ink-3); cursor: default; }
.insp-a { margin-top: 12px; font-size: 16px; line-height: 1.55; color: var(--ink-2); }
.insp-a b { color: var(--ink); }
.insp-a[hidden] { display: none; }
.insp-refs { display: grid; gap: 12px; }
.insp-refs a { font-weight: 600; color: var(--ink); border-bottom: 1px solid var(--line-2); }
.insp-refs a:hover { border-color: currentColor; }
.insp-refs span { display: block; margin-top: 4px; font-size: 13px; color: var(--ink-3); }
.insp-foot { margin-top: 22px; font-size: 14px; color: var(--ink-3); }
@media (max-width: 900px) { .insp-panel { grid-template-columns: 1fr; } }

/* 13. research standard */
.sec-standard { background: var(--bg-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.std-quote { font: 600 clamp(40px, 6vw, 96px)/1.02 var(--display); letter-spacing: -.05em; max-width: 13em; }
.std-body { margin-top: clamp(32px, 4vw, 56px); max-width: 34em; font-size: clamp(19px, 1.7vw, 23px); line-height: 1.5; color: var(--ink-2); }
.std-pillars { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; margin-top: clamp(64px, 8vw, 112px); }
.std-pillars > div { padding-top: 24px; border-top: 1px solid var(--line-2); }
.std-n { display: block; font: 500 13px/1 var(--font); color: var(--accent); letter-spacing: .1em; margin-bottom: 18px; }
.std-pillars h3 { font-size: 22px; }
.std-pillars p { margin-top: 10px; font-size: 15px; line-height: 1.55; color: var(--ink-3); }
@media (max-width: 800px) { .std-pillars { grid-template-columns: 1fr; } }

/* 14. philosophy */
.qs { border-top: 1px solid var(--line); }
.qs li { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); gap: 24px; padding: 30px 0; border-bottom: 1px solid var(--line); align-items: baseline; transition: background .3s; }
.qs .q { font: 600 clamp(26px, 3vw, 44px)/1.1 var(--display); letter-spacing: -.04em; transition: color .3s; }
.qs .a { font-size: 17px; color: var(--ink-3); }
.qs .a b { color: var(--ink); font-weight: 600; }
.qs li:hover .q { color: var(--accent); }
@media (max-width: 760px) { .qs li { grid-template-columns: 1fr; gap: 10px; padding: 24px 0; } }

/* 15. final call to action */
.final { position: relative; padding: calc(var(--section) * 1.1) 0; text-align: center; overflow: hidden; }
.final::before { content: ""; position: absolute; left: 50%; top: 50%; width: 1100px; height: 700px; transform: translate(-50%, -50%); background: radial-gradient(closest-side, rgba(70, 199, 170, .08), transparent 70%); pointer-events: none; }
.final h2 { position: relative; max-width: 10em; margin: 0 auto; }
.final-sub { position: relative; margin: 36px auto 0; font-size: clamp(18px, 1.7vw, 22px); color: var(--ink-2); max-width: 30em; }
.final .lp-ctas { position: relative; margin-top: 48px; }

/* footer */
.lp-foot { background: #000; color: var(--ink-3); padding: 72px 0 48px; border-top: 1px solid var(--line); font-size: 15px; }
.lp-foot .grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; }
.lp-foot .lp-brand { color: var(--ink); }
.lp-foot .tagline { margin-top: 14px; max-width: 300px; }
.lp-foot h4 { color: var(--ink); margin-bottom: 14px; }
.lp-foot ul { display: grid; gap: 10px; }
.lp-foot a:hover { color: var(--ink); }
.lp-foot .linkish { -webkit-appearance: none; appearance: none; background: none; border: 0; padding: 0; color: inherit; font: inherit; cursor: pointer; }
.lp-foot .linkish:hover { color: var(--ink); }
.lp-base { margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 10px 24px; justify-content: space-between; font-size: 13px; }
@media (max-width: 700px) { .lp-foot .grid { grid-template-columns: 1fr 1fr; } .lp-foot .grid > :first-child { grid-column: 1 / -1; } }

/* research explorer + paper pages */
.rx-hero { padding: clamp(56px, 8vw, 112px) 0 clamp(40px, 5vw, 64px); }
.rx-hero h1 { font-size: clamp(44px, 7vw, 104px); line-height: .98; letter-spacing: -.055em; }
.rx-stats { display: flex; flex-wrap: wrap; gap: 18px 48px; margin-top: 44px; }
.rx-stats b { display: block; font: 600 40px/1.05 var(--display); letter-spacing: -.04em; }
.rx-stats span { font-size: 13px; color: var(--ink-3); }
.rx-tools { position: sticky; top: 58px; z-index: 10; background: rgba(5, 5, 6, .9); -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 14px 0; }
.rx-tools .lp-wrap { display: grid; gap: 12px; }
.rx-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.rx-chips { display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none; margin: 0 calc(var(--gutter) * -1); padding: 2px var(--gutter); }
.rx-chips::-webkit-scrollbar { display: none; }
@media (min-width: 900px) { .rx-chips { flex-wrap: wrap; overflow: visible; margin: 0; padding: 0; } }
.chip-btn { -webkit-appearance: none; appearance: none; flex: 0 0 auto; height: 34px; padding: 0 14px; border-radius: 999px; border: 1px solid var(--line-2); background: transparent; color: var(--ink-2); font: 500 14px/1 var(--font); cursor: pointer; transition: background .2s, color .2s, border-color .2s; }
.chip-btn:hover { border-color: var(--ink); }
.chip-btn[aria-pressed="true"] { background: var(--ink); color: var(--on-ink); border-color: var(--ink); }
.rx-field { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; color: var(--ink-3); }
.rx-field select, .rx-field input { height: 38px; border-radius: 10px; border: 1px solid var(--line-2); background: var(--surface); color: var(--ink); font: 400 15px var(--font); padding: 0 12px; }
.rx-search { flex: 1 1 240px; }
.rx-search input { width: 100%; }
.rx-count { font-size: 14px; color: var(--ink-3); margin: 28px 0 16px; }
.rx-empty { padding: 48px 0; color: var(--ink-3); }
.rx-grid .paper[hidden] { display: none; }
@media (max-width: 640px) { .rx-tools { position: static; } }
.pp-head { padding: clamp(40px, 6vw, 88px) 0 clamp(36px, 4vw, 56px); border-bottom: 1px solid var(--line); }
.pp-crumb { font-size: 14px; color: var(--ink-3); margin-bottom: 28px; display: flex; gap: 8px; flex-wrap: wrap; }
.pp-crumb a { border-bottom: 1px solid var(--line-2); }
.pp-head h1 { font-size: clamp(30px, 4vw, 54px); line-height: 1.08; letter-spacing: -.04em; max-width: 960px; }
.pp-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.pp-by { margin-top: 22px; font-size: 16px; color: var(--ink-2); max-width: 900px; }
.pp-cite { margin-top: 6px; font-size: 15px; color: var(--ink-3); }
.pp-src { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 10px; }
.pp-body { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: clamp(40px, 6vw, 88px); padding: clamp(48px, 6vw, 80px) 0 var(--section); }
.pp-body section + section { margin-top: 48px; }
.pp-body h2 { font-size: 26px; letter-spacing: -.03em; margin-bottom: 12px; }
.pp-body section p { font-size: 18px; line-height: 1.65; color: var(--ink-2); max-width: 720px; }
.pp-body .fx { border-left: 2px solid var(--accent); padding-left: 22px; }
.pp-body .fx h2 { color: var(--accent); }
.pp-body .lim p { color: var(--ink-3); }
.pp-side { display: grid; gap: 28px; align-content: start; position: sticky; top: 96px; }
.pp-side h4 { margin-bottom: 12px; }
.pp-side ul { display: grid; gap: 10px; font-size: 15px; }
.pp-side a { border-bottom: 1px solid var(--line-2); }
.pp-side a:hover { border-color: currentColor; }
.pp-side .box { border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; background: var(--surface); font-size: 14px; color: var(--ink-3); line-height: 1.5; }
.pp-side .box b { color: var(--ink); }
@media (max-width: 900px) { .pp-body { grid-template-columns: 1fr; } .pp-side { position: static; } }

/* reveal + motion */
.lp-js [data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity 1s var(--ease), transform 1s var(--ease); transition-delay: var(--d, 0s); }
.lp-js [data-reveal].is-in { opacity: 1; transform: none; }
.lp-js [data-chip] { opacity: 0; transform: translateY(16px) scale(.98); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.lp-js .is-ready [data-chip] { opacity: 1; transform: none; }
.lp-js .is-ready .hc-target { transition-delay: .15s; } .lp-js .is-ready .hc-effort { transition-delay: .3s; } .lp-js .is-ready .hc-e1rm { transition-delay: .45s; }
.lp-js .hc .spark { stroke-dasharray: 400; stroke-dashoffset: 400; transition: stroke-dashoffset 1.8s var(--ease) .6s; }
.lp-js .is-ready .hc .spark { stroke-dashoffset: 0; }
@media (prefers-reduced-motion: reduce) {
  .lp *, .lp *::before, .lp *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
  .lp-js [data-reveal], .lp-js [data-chip] { opacity: 1; transform: none; }
  .lp-js .hc .spark { stroke-dashoffset: 0; }
  .sys-pulse { display: none; }
  .lp-js .story-step:not(.on), .flow-steps li, .tl-stages li { opacity: 1; }
  .tl-bar::after { transform: none !important; }
  .lp-js .sys-map:not(.is-in) .sys-nodes li, .lp-js .dec[data-steps]:not(.is-in) li { opacity: 1; transform: none; }
}
@media print { .lp-nav, .rx-tools { position: static; } }
@media (max-width: 640px) { .hero .kicker::before, .sec-head.center .kicker::before { display: none; } .hero .kicker { letter-spacing: .12em; font-size: 12px; } }