/* ============================================================
   NEURO — design system
   Dark cinematic base · warm off-white relief · violet wave accent
   ============================================================ */

:root {
  /* color */
  --ink: #08090e;
  --ink-2: #0c0e15;
  --ink-3: #12141d;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.14);
  --text: #e9eaf0;
  --text-dim: #9a9eb0;
  --text-faint: #6b6f80;

  --paper: #f5f2ec;
  --paper-2: #ece8df;
  --paper-line: rgba(20, 18, 30, 0.1);
  --paper-text: #1b1c24;
  --paper-text-dim: #5b5c68;

  --violet: #8b8ff5;
  --violet-soft: #b4a8f2;
  --amber: #e8b27d;
  --grad-accent: linear-gradient(120deg, #8b8ff5, #b4a8f2 55%, #e8b27d);

  /* type */
  --font-sans: "Hanken Grotesk", -apple-system, "Segoe UI", sans-serif;
  --font-serif: "Newsreader", Georgia, serif;

  /* rhythm */
  --space-section: clamp(96px, 14vh, 180px);
  --radius: 20px;
  --radius-sm: 12px;
  --container: 1180px;

  --ease: cubic-bezier(0.22, 0.8, 0.3, 1);
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  font-weight: 400;
  background: var(--ink);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  clip-path: inset(50%); overflow: hidden; white-space: nowrap;
}

/* ---------- layout ---------- */
.container {
  width: min(var(--container), 100% - 48px);
  margin-inline: auto;
}
.container--narrow { width: min(880px, 100% - 48px); }

.section { padding-block: var(--space-section); position: relative; }
.section--dark { background: var(--ink); }
.section--dark:nth-of-type(even) { background: var(--ink-2); }

.section--light {
  background: var(--paper);
  color: var(--paper-text);
}
.section--light .eyebrow { color: #7a6bd8; }
.section--light .section__lede { color: var(--paper-text-dim); }

/* ---------- typography ---------- */
.eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--violet);
  margin-bottom: 22px;
}
.section__title {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(38px, 5.4vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin-bottom: 26px;
}
.section__title em {
  font-style: italic;
  font-weight: 300;
}
.section__lede {
  font-size: clamp(17px, 1.6vw, 20px);
  font-weight: 300;
  color: var(--text-dim);
  max-width: 640px;
  margin-bottom: 56px;
}
.section__turn {
  font-family: var(--font-serif);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 300;
  margin-top: 72px;
  max-width: 720px;
}
.accent-text {
  background: var(--grad-accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 15.5px;
  font-weight: 500;
  letter-spacing: 0.01em;
  padding: 15px 32px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease),
              background 0.35s var(--ease), border-color 0.35s var(--ease);
  white-space: nowrap;
}
.btn--primary {
  background: linear-gradient(120deg, #9a9df8, #b9abf4);
  color: #0c0d18;
  box-shadow: 0 0 0 0 rgba(139, 143, 245, 0);
}
.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 36px -8px rgba(139, 143, 245, 0.55);
}
.btn--ghost {
  border-color: var(--line-strong);
  color: var(--text);
  background: rgba(255, 255, 255, 0.02);
}
.btn--ghost:hover {
  border-color: rgba(255, 255, 255, 0.32);
  background: rgba(255, 255, 255, 0.05);
}
.btn--sm { padding: 10px 22px; font-size: 14px; }

/* ---------- nav ---------- */
.nav {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 100;
  transition: background 0.4s var(--ease), border-color 0.4s var(--ease),
              backdrop-filter 0.4s var(--ease);
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(8, 9, 14, 0.72);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom-color: var(--line);
}
.nav__inner {
  width: min(var(--container), 100% - 48px);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-block: 18px;
}
.nav__logo {
  font-family: var(--font-sans);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.06em;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.nav__logo-wave {
  width: 36px;
  height: 14px;
  filter: drop-shadow(0 0 10px rgba(139, 143, 245, 0.55));
}
.nav__links { display: flex; gap: 34px; }
.nav__links a {
  font-size: 14.5px;
  color: var(--text-dim);
  transition: color 0.3s var(--ease);
}
.nav__links a:hover { color: var(--text); }

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding-top: clamp(150px, 22vh, 230px);
  padding-bottom: var(--space-section);
  text-align: center;
  overflow: hidden;
}
.hero__glow {
  position: absolute;
  top: -340px; left: 50%;
  width: 1100px; height: 760px;
  transform: translateX(-50%);
  background:
    radial-gradient(ellipse 50% 45% at 50% 40%, rgba(139, 143, 245, 0.16), transparent 70%),
    radial-gradient(ellipse 40% 35% at 62% 55%, rgba(232, 178, 125, 0.07), transparent 70%);
  pointer-events: none;
}
.hero__content { position: relative; }
.hero__title {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(46px, 7.4vw, 92px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 30px;
}
.hero__sub {
  font-size: clamp(17px, 1.7vw, 21px);
  font-weight: 300;
  color: var(--text-dim);
  max-width: 620px;
  margin-inline: auto;
  margin-bottom: 42px;
}
.hero__ctas {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 30px;
}
.hero__trustline {
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 30px;
}

/* hero document downloads */
.hero__docs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 72px;
}
.doc-pill {
  display: inline-flex;
  align-items: center;
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--text-dim);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 8px 17px;
  background: rgba(255, 255, 255, 0.02);
  transition: border-color 0.3s var(--ease), color 0.3s var(--ease), background 0.3s var(--ease);
}
.doc-pill:hover {
  border-color: rgba(139, 143, 245, 0.6);
  color: var(--violet-soft);
  background: rgba(139, 143, 245, 0.06);
}
.doc-pill__hint {
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  border-left: 1px solid var(--line-strong);
  padding-left: 8px;
  margin-left: 4px;
}

/* hero media + play button */
.hero-media { position: relative; }
.play-btn {
  position: absolute;
  inset: 0;
  margin: auto;
  width: max-content;
  height: max-content;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
  font-family: var(--font-sans);
}
.play-btn__circle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 84px;
  height: 84px;
  border-radius: 50%;
  background: rgba(8, 9, 14, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 0 50px rgba(139, 143, 245, 0.35);
  transition: transform 0.35s var(--ease), background 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.play-btn__circle svg { margin-left: 4px; }
.play-btn:hover .play-btn__circle {
  transform: scale(1.07);
  background: rgba(139, 143, 245, 0.25);
  box-shadow: 0 0 70px rgba(139, 143, 245, 0.55);
}
.play-btn__label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text);
  text-shadow: 0 1px 12px rgba(8, 9, 14, 0.8);
}

/* film modal */
.film-modal { position: fixed; inset: 0; z-index: 300; }
.film-modal[hidden] { display: none !important; }
.film-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(8, 9, 14, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.film-modal__body {
  position: absolute;
  inset: 0;
  margin: auto;
  width: min(1100px, 92vw);
  height: max-content;
}
.film-modal__body video {
  width: 100%;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--line-strong);
  box-shadow: 0 40px 140px -30px rgba(0, 0, 0, 0.9);
  background: #000;
}
.film-modal__close {
  position: absolute;
  top: -52px;
  right: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}
.film-modal__close:hover {
  background: rgba(139, 143, 245, 0.15);
  border-color: rgba(139, 143, 245, 0.5);
}

/* ---------- images & placeholders ---------- */
.ph { margin-top: 24px; }
.ph--hero { margin-top: 0; }
.ph__img {
  width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}
.ph--hero .ph__img {
  box-shadow: 0 40px 120px -40px rgba(139, 143, 245, 0.25);
}
.ph--flush .ph__img { border-radius: 0; border: none; }
.ph__frame {
  position: relative;
  width: 100%;
  border-radius: var(--radius);
  border: 1px dashed rgba(139, 143, 245, 0.35);
  background:
    radial-gradient(ellipse 70% 90% at 50% 110%, rgba(139, 143, 245, 0.13), transparent 65%),
    radial-gradient(ellipse 45% 50% at 75% 0%, rgba(232, 178, 125, 0.05), transparent 70%),
    var(--ink-3);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 32px;
  text-align: center;
  overflow: hidden;
}
.ph__frame--light {
  background:
    radial-gradient(ellipse 70% 90% at 50% 110%, rgba(139, 143, 245, 0.12), transparent 65%),
    var(--paper-2);
  border-color: rgba(122, 107, 216, 0.4);
}
.ph__tag {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--violet);
  border: 1px solid rgba(139, 143, 245, 0.4);
  border-radius: 999px;
  padding: 6px 14px;
}
.ph__desc {
  font-size: 14.5px;
  font-weight: 300;
  color: var(--text-dim);
  max-width: 560px;
}
.ph__frame--light .ph__desc { color: var(--paper-text-dim); }
.ph__caption {
  font-size: 12px;
  line-height: 1.55;
  color: var(--text-faint);
  margin-top: 14px;
  max-width: 880px;
  margin-inline: auto;
  text-align: left;
}
.section--light .ph__caption { color: #8a8b96; }

/* aspect ratios */
.ratio-21x9 { aspect-ratio: 21 / 9; }
.ratio-16x9 { aspect-ratio: 16 / 9; }
.ratio-4x3  { aspect-ratio: 4 / 3; }
.ratio-3x2  { aspect-ratio: 3 / 2; }
.ratio-4x5  { aspect-ratio: 4 / 5; }
.ratio-1x1  { aspect-ratio: 1 / 1; }

/* ---------- grids & cards ---------- */
.grid { display: grid; gap: 20px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  border-radius: var(--radius);
  padding: 30px 28px;
}
.card h3 {
  font-size: 17.5px;
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}
.card p { font-size: 15px; font-weight: 300; color: var(--text-dim); }

.card--quiet {
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--line);
  transition: border-color 0.4s var(--ease), background 0.4s var(--ease);
}
.card--quiet:hover {
  border-color: rgba(139, 143, 245, 0.3);
  background: rgba(139, 143, 245, 0.05);
}

.problem__grid { margin-top: 8px; }

/* ---------- steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 72px;
}
.step {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 40px 32px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.008));
  transition: border-color 0.4s var(--ease), transform 0.4s var(--ease);
}
.step:hover { border-color: rgba(139, 143, 245, 0.35); transform: translateY(-3px); }
.step__num {
  font-family: var(--font-serif);
  font-size: 15px;
  font-style: italic;
  color: var(--violet);
  display: block;
  margin-bottom: 18px;
}
.step h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 27px;
  margin-bottom: 14px;
}
.step p { font-size: 15px; font-weight: 300; color: var(--text-dim); }

/* ---------- split layout ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 90px);
  align-items: center;
}
.split--reverse .split__text { order: 2; }
.split--reverse .split__media { order: 1; }
.split .ph { margin-top: 0; }
.split .section__lede { margin-bottom: 36px; }

.checklist li {
  position: relative;
  padding-left: 30px;
  margin-bottom: 13px;
  font-size: 15.5px;
  font-weight: 300;
  color: var(--text-dim);
}
.checklist li::before {
  content: "";
  position: absolute;
  left: 0; top: 8px;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--grad-accent);
  box-shadow: 0 0 10px rgba(139, 143, 245, 0.6);
}

/* ---------- the closed loop ---------- */
.loop-diagram {
  display: flex;
  align-items: stretch;
  gap: 10px;
  margin-bottom: 72px;
}
.loop-node {
  flex: 1;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 22px 18px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.008));
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.loop-node strong {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 19px;
  letter-spacing: 0.01em;
}
.loop-node span { font-size: 13px; font-weight: 300; color: var(--text-dim); line-height: 1.5; }
.loop-node--you {
  border-color: rgba(139, 143, 245, 0.4);
  background: linear-gradient(180deg, rgba(139, 143, 245, 0.09), rgba(139, 143, 245, 0.02));
}
.loop-arrow {
  align-self: center;
  color: var(--violet);
  font-size: 18px;
  flex: 0 0 auto;
}

.loop-map {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(28px, 4vw, 48px);
  background: rgba(255, 255, 255, 0.015);
  margin-bottom: 16px;
}
.loop-map__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 25px;
  margin-bottom: 30px;
}
.loop-map__row {
  display: grid;
  grid-template-columns: 240px 36px 1fr;
  gap: 14px;
  align-items: baseline;
  padding-block: 16px;
  border-top: 1px solid var(--line);
}
.loop-map__signal { font-size: 15.5px; font-weight: 500; color: var(--text); }
.loop-map__arrow { color: var(--violet); text-align: center; }
.loop-map__response { font-size: 14.5px; font-weight: 300; color: var(--text-dim); }
.loop-map__footnote {
  font-size: 13.5px;
  color: var(--text-faint);
  max-width: 720px;
  margin-bottom: 24px;
}
.loop-map__footnote a { color: var(--violet-soft); border-bottom: 1px dotted rgba(139, 143, 245, 0.5); }

/* ---------- sensor spec card ---------- */
.sensor {
  margin-top: 88px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 72px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: clamp(32px, 4vw, 52px);
  background: linear-gradient(160deg, rgba(139, 143, 245, 0.05), rgba(255, 255, 255, 0.012) 55%);
}
.sensor__intro h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 27px;
  margin-bottom: 16px;
}
.sensor__intro p { font-size: 15px; font-weight: 300; color: var(--text-dim); }
.sensor__intro strong { color: var(--text); font-weight: 500; }
.sensor__specs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 28px;
  align-content: center;
}
.sensor__specs dt {
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 5px;
}
.sensor__specs dd { font-size: 14.5px; font-weight: 300; color: var(--violet-soft); }

/* ---------- what it reads ---------- */
.reads { margin-top: 40px; text-align: center; }
.reads__title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 20px;
}
.reads__chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.reads__chips li {
  font-size: 14px;
  font-weight: 400;
  color: var(--text-dim);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 9px 20px;
  background: rgba(255, 255, 255, 0.02);
}

/* ---------- published stats ---------- */
.stats {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.stat {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 30px;
  background: rgba(255, 255, 255, 0.018);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.stat__num {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(40px, 4.5vw, 56px);
  line-height: 1;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat__unit { font-size: 0.45em; margin-left: 4px; }
.stat__label { font-size: 14px; font-weight: 300; color: var(--text-dim); }
.stat__src {
  font-size: 12.5px;
  color: var(--violet-soft);
  border-bottom: 1px dotted rgba(139, 143, 245, 0.5);
  align-self: flex-start;
  margin-top: auto;
}
.stats__footnote {
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-faint);
  max-width: 680px;
}

/* ---------- planned methods (science) ---------- */
.planned { margin-top: 64px; }
.planned__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 27px;
  margin-bottom: 10px;
}
.planned__lede {
  color: var(--paper-text-dim);
  font-weight: 300;
  max-width: 620px;
  margin-bottom: 28px;
}
.grade--planned { color: #6a6b76; border: 1px solid rgba(106, 107, 118, 0.35); background: rgba(106, 107, 118, 0.07); }
.planned__honesty {
  margin-top: 28px;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 16.5px;
  color: var(--paper-text-dim);
  max-width: 760px;
  border-left: 2px solid rgba(122, 107, 216, 0.45);
  padding-left: 18px;
}

/* ---------- validation card ---------- */
.validation {
  margin-top: 88px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: clamp(32px, 4vw, 52px);
  background: linear-gradient(160deg, rgba(139, 143, 245, 0.06), rgba(255, 255, 255, 0.012) 55%);
}
.validation__head {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.validation__head h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 26px;
}
.badge {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 999px;
}
.badge--pending {
  color: var(--amber);
  border: 1px solid rgba(232, 178, 125, 0.4);
}
.validation__note {
  font-size: 15px;
  font-weight: 300;
  color: var(--text-dim);
  max-width: 600px;
  margin-bottom: 34px;
}
.validation__list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px 40px;
}
.validation__list dt {
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 6px;
}
.validation__list dd { font-size: 15px; color: var(--violet-soft); font-weight: 300; }

/* ---------- adaptive environment ---------- */
.env-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.env-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.018);
}
.env-card__media .ph { margin: 0; }
.env-card__media .ph__img { border-bottom: 1px solid var(--line); }
.env-card h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 28px;
  padding: 26px 30px 0;
}
.feature-list { padding: 18px 30px 6px; }
.feature-list li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 11px;
  font-size: 15px;
  font-weight: 300;
  color: var(--text-dim);
}
.feature-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 9px;
  width: 12px; height: 2px;
  border-radius: 2px;
  background: var(--grad-accent);
}
.env-card__evidence {
  padding: 14px 30px 30px;
  font-size: 13px;
  line-height: 1.9;
  color: var(--text-faint);
}

.cite {
  color: var(--violet-soft);
  border-bottom: 1px dotted rgba(139, 143, 245, 0.5);
}
.section--light .cite { color: #6a5cc9; border-bottom-color: rgba(122, 107, 216, 0.5); }

/* ---------- concept strip ---------- */
.concept-strip {
  display: flex;
  align-items: stretch;
  gap: 14px;
  margin-bottom: 56px;
}
.concept-strip__item {
  flex: 1;
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-sm);
  background: #fff;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.concept-strip__item--goal {
  border-color: rgba(122, 107, 216, 0.45);
  background: linear-gradient(160deg, rgba(122, 107, 216, 0.08), #fff 60%);
}
.concept-strip__label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #8a8b96;
}
.concept-strip__value {
  font-family: var(--font-serif);
  font-size: 19px;
  color: var(--paper-text);
}
.concept-strip__arrow {
  align-self: center;
  color: #7a6bd8;
  font-size: 18px;
}

/* ---------- concept visual tiles ---------- */
.ph--concept { margin: 0 0 20px; }
.ph--concept .ph__frame {
  padding: 18px;
  gap: 8px;
  min-height: 0;
  border-radius: var(--radius-sm);
}
.ph--concept .ph__tag { font-size: 9.5px; padding: 4px 10px; }
.ph--concept .ph__desc { font-size: 12.5px; max-width: 100%; }
.ph--concept .ph__img { border-radius: var(--radius-sm); }

/* ---------- method plain + disclosure ---------- */
.method__plain {
  font-size: 14.5px;
  color: var(--paper-text-dim);
  margin-bottom: 14px;
}
.method__more summary {
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #6a5cc9;
  user-select: none;
}
.method__more summary::-webkit-details-marker { display: none; }
.method__more summary::after {
  content: "+";
  font-size: 15px;
  font-weight: 400;
  line-height: 1;
  transition: transform 0.3s var(--ease);
}
.method__more[open] summary::after { content: "–"; }
.method__more[open] summary { margin-bottom: 10px; }
.method__more p { font-size: 13.5px; color: var(--paper-text-dim); margin-bottom: 8px; }

.method-wide__grid {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}
.method-wide__grid .ph--concept { margin-bottom: 0; }

/* ---------- science (light section) ---------- */
.science__grid { margin-bottom: 32px; }
.card--method {
  background: #fff;
  border: 1px solid var(--paper-line);
  box-shadow: 0 1px 2px rgba(20, 18, 30, 0.04), 0 12px 40px -18px rgba(20, 18, 30, 0.12);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.card--method:hover {
  transform: translateY(-3px);
  box-shadow: 0 1px 2px rgba(20, 18, 30, 0.04), 0 24px 56px -20px rgba(20, 18, 30, 0.2);
}
.card--method h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 21px;
  margin-bottom: 14px;
  color: var(--paper-text);
}
.card--method p {
  color: var(--paper-text-dim);
  font-size: 14px;
  margin-bottom: 10px;
}
.card--method strong { color: var(--paper-text); font-weight: 600; }
.method__head {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.method__head h3 { margin-bottom: 0; width: 100%; }
.grade {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 4px 11px;
  border-radius: 999px;
  white-space: nowrap;
}
.grade--strong { color: #2e7d4f; border: 1px solid rgba(46, 125, 79, 0.35); background: rgba(46, 125, 79, 0.07); }
.grade--good { color: #5a4fc0; border: 1px solid rgba(90, 79, 192, 0.35); background: rgba(90, 79, 192, 0.07); }
.grade--modest { color: #a4702c; border: 1px solid rgba(164, 112, 44, 0.35); background: rgba(164, 112, 44, 0.08); }
.method__sources {
  font-size: 12.5px;
  color: #8a8b96;
  margin-top: 4px;
}
.method__sources a {
  color: #6a5cc9;
  border-bottom: 1px dotted rgba(122, 107, 216, 0.5);
  transition: color 0.3s var(--ease);
}
.method__sources a:hover { color: #4d3fb0; }
.card--method-wide {
  margin-top: 20px;
  background: #fff;
  border: 1px solid var(--paper-line);
  box-shadow: 0 1px 2px rgba(20, 18, 30, 0.04), 0 12px 40px -18px rgba(20, 18, 30, 0.12);
}
.card--method-wide .method__what,
.card--method-wide .method__why { max-width: 880px; }
.science__footnote {
  margin-top: 28px;
  font-size: 13.5px;
  font-family: var(--font-serif);
  font-style: italic;
  color: #8a8b96;
  max-width: 640px;
}

/* evidence roadmap */
.roadmap {
  margin-top: 72px;
  border: 1px solid rgba(20, 18, 30, 0.14);
  border-radius: var(--radius);
  padding: clamp(32px, 4vw, 52px);
  background: var(--paper-2);
}
.roadmap h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 27px;
  margin-bottom: 12px;
}
.roadmap > p {
  color: var(--paper-text-dim);
  font-weight: 300;
  max-width: 620px;
  margin-bottom: 28px;
}
.roadmap__list {
  display: grid;
  gap: 18px;
  padding-left: 22px;
  margin-bottom: 28px;
}
.roadmap__list li { font-size: 15px; color: var(--paper-text-dim); font-weight: 300; }
.roadmap__list strong { color: var(--paper-text); font-weight: 600; }
.roadmap__list a {
  color: #6a5cc9;
  border-bottom: 1px dotted rgba(122, 107, 216, 0.5);
}
.roadmap__footnote {
  font-size: 13.5px;
  font-style: italic;
  font-family: var(--font-serif);
  color: #8a8b96;
}

/* ---------- design gallery ---------- */
.gallery {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 64px;
}
.gallery__main { grid-column: 1 / -1; }
.gallery .ph { margin-top: 0; }

/* ---------- privacy ---------- */
.section--privacy { text-align: center; }
.section--privacy .section__lede { margin-inline: auto; }
.privacy__grid { text-align: left; }
.card--privacy {
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--line);
}
.card--privacy h3 { color: var(--violet-soft); }
.privacy__note {
  margin-top: 44px;
  font-size: 13.5px;
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--text-faint);
}

/* ---------- comparison ---------- */
.table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--line); }
.compare {
  width: 100%;
  min-width: 900px;
  border-collapse: collapse;
  font-size: 14.5px;
}
.compare th, .compare td {
  padding: 18px 22px;
  text-align: center;
  border-bottom: 1px solid var(--line);
}
.compare tbody tr:last-child th,
.compare tbody tr:last-child td { border-bottom: none; }
.compare thead th {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  background: rgba(255, 255, 255, 0.02);
}
.compare tbody th {
  text-align: left;
  font-weight: 400;
  color: var(--text-dim);
  white-space: nowrap;
}
.compare__neuro {
  background: rgba(139, 143, 245, 0.07);
  color: var(--text) !important;
}
thead .compare__neuro { color: var(--violet-soft) !important; }
.yes { color: var(--violet); }
.partial { color: var(--text-faint); }
.no { color: rgba(255, 255, 255, 0.18); }
.compare__eg {
  display: block;
  font-size: 10.5px;
  font-weight: 400;
  letter-spacing: 0.04em;
  text-transform: none;
  color: var(--text-faint);
  margin-top: 4px;
}
.compare__pricerow td {
  font-size: 12.5px;
  color: var(--text-dim);
  line-height: 1.45;
}
.compare__pricerow td.compare__neuro { font-weight: 500; }
.compare__legend {
  margin-top: 18px;
  font-size: 13px;
  color: var(--text-faint);
}
.compare__footnote {
  margin-top: 12px;
  font-size: 12.5px;
  color: var(--text-faint);
  max-width: 760px;
}

/* ---------- document download links ---------- */
.doc-link { margin-top: 22px; }
.doc-link a {
  display: inline-flex;
  align-items: center;
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--violet-soft);
  border: 1px solid rgba(139, 143, 245, 0.35);
  border-radius: 999px;
  padding: 10px 22px;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.doc-link a:hover {
  border-color: rgba(139, 143, 245, 0.7);
  background: rgba(139, 143, 245, 0.07);
}

/* ---------- product family ---------- */
.family {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-bottom: 64px;
}
.family-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 22px;
  background: rgba(255, 255, 255, 0.02);
  transition: border-color 0.4s var(--ease);
}
.family-card:hover { border-color: rgba(139, 143, 245, 0.3); }
.family-card--now {
  border-color: rgba(139, 143, 245, 0.45);
  background: linear-gradient(170deg, rgba(139, 143, 245, 0.09), rgba(255, 255, 255, 0.015) 60%);
}
.family-card__badge {
  display: inline-block;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--violet-soft);
  border: 1px solid rgba(139, 143, 245, 0.45);
  border-radius: 999px;
  padding: 5px 13px;
  margin-bottom: 18px;
}
.family-card__badge--future {
  color: var(--text-faint);
  border-color: var(--line-strong);
}
.family-card h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 22px;
  margin-bottom: 10px;
}
.family-card__what {
  font-size: 13.5px;
  font-weight: 300;
  color: var(--text-dim);
  margin-bottom: 14px;
}
.family-card__adds {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--text-faint);
}
.family__footnote {
  margin-top: 28px;
  font-size: 13.5px;
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--text-faint);
  max-width: 640px;
}

/* ---------- final CTA ---------- */
.cta {
  position: relative;
  padding-block: calc(var(--space-section) * 1.15);
  text-align: center;
  overflow: hidden;
  background: var(--ink-2);
}
.cta__glow {
  position: absolute;
  bottom: -380px; left: 50%;
  width: 1200px; height: 700px;
  transform: translateX(-50%);
  background:
    radial-gradient(ellipse 50% 50% at 50% 60%, rgba(139, 143, 245, 0.18), transparent 70%),
    radial-gradient(ellipse 35% 40% at 38% 70%, rgba(232, 178, 125, 0.08), transparent 70%);
  pointer-events: none;
}
.cta__content { position: relative; }
.cta__title {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin-bottom: 22px;
}
.cta__sub {
  font-size: 17px;
  font-weight: 300;
  color: var(--text-dim);
  max-width: 520px;
  margin-inline: auto;
  margin-bottom: 40px;
}
.cta__form {
  display: flex;
  gap: 12px;
  justify-content: center;
  max-width: 520px;
  margin-inline: auto;
  margin-bottom: 18px;
}
.cta__form input {
  flex: 1;
  min-width: 0;
  font-family: var(--font-sans);
  font-size: 15.5px;
  font-weight: 300;
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 15px 26px;
  outline: none;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.cta__form input::placeholder { color: var(--text-faint); }
.cta__form input:focus {
  border-color: rgba(139, 143, 245, 0.6);
  background: rgba(139, 143, 245, 0.06);
}
.cta__confirm {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 17px;
  color: var(--violet-soft);
  margin-bottom: 18px;
}
.cta__secondary { margin-bottom: 26px; }
.cta__finePrint { font-size: 12.5px; color: var(--text-faint); }

/* ---------- footer ---------- */
.footer {
  background: var(--ink);
  border-top: 1px solid var(--line);
  padding-block: 64px 40px;
}
.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}
.footer__tagline {
  margin-top: 16px;
  font-size: 14px;
  font-weight: 300;
  color: var(--text-faint);
}
.footer__nav { display: flex; gap: 32px; flex-wrap: wrap; }
.footer__nav a {
  font-size: 14.5px;
  color: var(--text-dim);
  transition: color 0.3s var(--ease);
}
.footer__nav a:hover { color: var(--text); }
.footer__legal {
  border-top: 1px solid var(--line);
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.footer__legal p { font-size: 12.5px; color: var(--text-faint); max-width: 560px; }

/* ---------- reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }

/* stagger siblings inside grids */
.grid .reveal:nth-child(2), .steps .reveal:nth-child(2) { transition-delay: 0.08s; }
.grid .reveal:nth-child(3), .steps .reveal:nth-child(3) { transition-delay: 0.16s; }
.grid .reveal:nth-child(4) { transition-delay: 0.24s; }
.grid .reveal:nth-child(5) { transition-delay: 0.32s; }
.grid .reveal:nth-child(6) { transition-delay: 0.4s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .step, .card--method { transition: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 1020px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; }
  .split--reverse .split__text { order: 1; }
  .split--reverse .split__media { order: 2; }
  .env-grid { grid-template-columns: 1fr; }
  .validation__list { grid-template-columns: 1fr; }
  .loop-diagram { flex-direction: column; }
  .loop-arrow { transform: rotate(90deg); padding-block: 2px; }
  .loop-map__row { grid-template-columns: 1fr; gap: 6px; }
  .loop-map__arrow { display: none; }
  .sensor { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr; }
  .concept-strip { flex-direction: column; }
  .concept-strip__arrow { transform: rotate(90deg); }
  .method-wide__grid { grid-template-columns: 1fr; }
  .family { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 1240px) and (min-width: 1021px) {
  .family { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 680px) {
  :root { --space-section: 88px; }
  .nav__links { display: none; }
  .grid--4, .grid--3 { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: 1fr; }
  .hero { padding-top: 130px; }
  .hero__ctas .btn { width: 100%; }
  .family { grid-template-columns: 1fr; }
  .play-btn__circle { width: 60px; height: 60px; }
  .play-btn__label { display: none; }
  .film-modal__close { top: -48px; right: 4px; }
  .cta__form { flex-direction: column; }
  .cta__form .btn { width: 100%; }
  .ph__frame { padding: 22px; min-height: 200px; }
  .ratio-21x9 { aspect-ratio: auto; }
  .footer__inner { flex-direction: column; }
}