:root {
  /* NNRRI brand kit (SmartGT) */
  --bg: #f4f8fd;
  --cream: #f4f8fd;
  --cream-2: #f8fbff;
  --paper: #ffffff;

  --blue: #2e60a1;
  --blue-dark: #234a7d;
  --blue-soft: #dce8f5;
  --green: #0d6f5e;
  --green-soft: #d9ebe7;
  --orange: #cf5819;
  --orange-deep: #a84614;
  --orange-soft: #f5e6dc;

  --peach: var(--blue-soft);
  --peach-soft: #e8f0f8;
  --orange-wash: var(--orange-soft);
  --sand: var(--green-soft);
  --mint: var(--green);
  --mint-deep: #0a5a4c;
  --mint-soft: var(--green-soft);

  --ink: #1a2e44;
  --ink-muted: #5a6d82;
  --ink-faint: #7a90a8;
  --ink-invert: #ffffff;
  --ink-invert-muted: rgba(255, 255, 255, 0.82);

  --line: rgba(46, 96, 161, 0.14);
  --line-strong: rgba(46, 96, 161, 0.22);
  --line-invert: rgba(255, 255, 255, 0.2);

  --shadow-sm: 0 8px 24px rgba(30, 58, 95, 0.07);
  --shadow-md: 0 22px 46px rgba(46, 96, 161, 0.12);
  --shadow-lg: 0 34px 80px rgba(30, 58, 95, 0.12);

  --radius: 16px;
  --radius-lg: 20px;
  --radius-xl: 24px;
  --wrap: 1160px;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  font-family: "Raleway", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

/* ============ Ambient (flat blurred shapes, no gradients) ============ */
.aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
  background: var(--bg);
}

.aurora__blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  animation: drift 24s ease-in-out infinite;
}
.aurora__blob--peach { width: 540px; height: 540px; background: var(--blue); opacity: 0.22; top: -14%; left: -8%; }
.aurora__blob--mint  { width: 460px; height: 460px; background: var(--green); opacity: 0.18; top: 32%; right: -12%; animation-delay: -8s; }
.aurora__blob--sand  { width: 420px; height: 420px; background: var(--orange); opacity: 0.16; bottom: 4%; left: 24%; animation-delay: -15s; }

@keyframes drift {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(26px, -20px, 0) scale(1.06); }
}

/* ============ Primitives ============ */
.skip-link {
  position: absolute; left: -9999px; top: 0;
  padding: 8px 16px; background: var(--orange); color: #fff; z-index: 100;
  border-radius: 0 0 10px 0;
}
.skip-link:focus { left: 0; top: 0; }

.wrap { width: min(100% - 32px, var(--wrap)); margin-inline: auto; }

.reveal {
  opacity: 0;
  transform: translate3d(0, 24px, 0);
  transition: opacity 0.6s cubic-bezier(0.23, 1, 0.32, 1), transform 0.6s cubic-bezier(0.23, 1, 0.32, 1);
}
.reveal--delay { transition-delay: 0.1s; }
.reveal.is-visible { opacity: 1; transform: none; }

/* ============ Header ============ */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(244, 248, 253, 0.88);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 74px; gap: 16px;
}

.brand {
  display: inline-flex; align-items: center; gap: 14px;
  text-decoration: none; color: var(--blue-dark);
  flex-wrap: wrap;
}
.brand__logo { display: block; height: 40px; width: auto; max-width: min(100%, 300px); }
.brand__product {
  font-size: 0.72rem; font-weight: 600; letter-spacing: 0.04em;
  color: var(--ink-muted); line-height: 1.2;
}

.site-nav { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.site-nav a {
  text-decoration: none; font-weight: 600; font-size: 0.9rem;
  padding: 9px 14px; border-radius: 11px; color: var(--ink-muted);
  transition: color 0.15s ease-out, background 0.15s ease-out;
}
.site-nav a:not(.btn):hover { color: var(--blue-dark); background: rgba(46, 96, 161, 0.06); }
.site-nav a.btn--primary { color: #fff; }

.nav-toggle {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 44px; height: 44px; padding: 0; border: 1px solid var(--line-strong);
  border-radius: 12px; background: var(--paper); cursor: pointer;
}
.nav-toggle span {
  display: block; width: 20px; height: 2px; margin-inline: auto;
  background: var(--ink); border-radius: 2px;
  transition: transform 0.25s ease-out, opacity 0.2s ease-out;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============ Buttons (flat) ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 46px; padding: 0 22px; border-radius: 13px;
  font-weight: 700; font-size: 0.94rem; text-decoration: none;
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
  transition: transform 0.2s cubic-bezier(0.23, 1, 0.32, 1), box-shadow 0.2s ease-out, background 0.2s ease-out;
}
.btn:active { transform: scale(0.97); }
.btn--lg { min-height: 54px; padding-inline: 28px; font-size: 1rem; }

.btn--primary {
  background: var(--orange); color: #fff;
  box-shadow: 0 10px 26px rgba(207, 88, 25, 0.24);
}
.btn--primary:hover { background: var(--orange-deep); transform: translate3d(0, -2px, 0); }

.btn--light { background: #fff; color: var(--blue-dark); box-shadow: 0 10px 28px rgba(30, 58, 95, 0.14); }
.btn--light:hover { transform: translate3d(0, -2px, 0); }

.btn--ghost { background: var(--paper); border-color: var(--line-strong); color: var(--ink); }
.btn--ghost:hover { border-color: var(--blue); color: var(--blue-dark); transform: translate3d(0, -1px, 0); }

.btn--glow { position: relative; overflow: hidden; }
.btn--glow::after {
  content: ""; position: absolute; inset: 0;
  background: rgba(255, 255, 255, 0.28);
  transform: translate3d(-130%, 0, 0) skewX(-18deg); width: 40%;
  transition: transform 0.7s ease-out;
}
.btn--glow:hover::after { transform: translate3d(360%, 0, 0) skewX(-18deg); }

/* ============ Type ============ */
.kicker {
  margin: 0 0 14px; font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--green);
}
.kicker--invert { color: var(--ink-invert); }

h1 {
  margin: 0 0 20px; font-size: clamp(2.3rem, 5.2vw, 3.6rem); line-height: 1.06;
  letter-spacing: -0.03em; font-weight: 800; text-wrap: balance;
}
.hero__accent { color: var(--blue); }

h2 {
  margin: 0; font-size: clamp(1.7rem, 3.4vw, 2.3rem); line-height: 1.14;
  letter-spacing: -0.025em; font-weight: 800; text-wrap: balance;
}
h3 { margin: 0 0 8px; font-size: 1.16rem; font-weight: 700; letter-spacing: -0.01em; }

.section-head { margin-bottom: 40px; max-width: 660px; }
.section-lead { margin: 16px 0 0; color: var(--ink-muted); font-size: 1.08rem; text-wrap: pretty; }

/* ============ Hero ============ */
.hero-stage { position: relative; overflow: hidden; padding-bottom: 72px; }
.hero {
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 48px; align-items: center; padding: 64px 0 32px;
  position: relative; z-index: 2;
}
.hero__copy { min-width: 0; }
.hero__lead { margin: 0 0 28px; color: var(--ink-muted); max-width: 48ch; font-size: 1.1rem; line-height: 1.62; text-wrap: pretty; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 28px; }

.hero__trust { display: flex; flex-wrap: wrap; gap: 10px 22px; margin: 0; padding: 0; list-style: none; }
.hero__trust li { font-size: 0.84rem; font-weight: 600; color: var(--ink-muted); padding-left: 18px; position: relative; }
.hero__trust li::before {
  content: ""; position: absolute; left: 0; top: 0.5em;
  width: 8px; height: 8px; border-radius: 50%; background: var(--orange);
}

/* ---- EEG signature line (looping impulse) ---- */
.eeg { position: absolute; bottom: 2px; left: 0; right: 0; height: 70px; z-index: 1; opacity: 0.5; pointer-events: none; }
.eeg svg { width: 100%; height: 100%; display: block; }
.eeg__track,
.eeg__beam {
  fill: none; stroke-linecap: round; stroke-linejoin: round;
}
.eeg__track { stroke: rgba(46, 96, 161, 0.18); stroke-width: 1.8; }
.eeg__beam {
  stroke: var(--orange); stroke-width: 2.4;
  stroke-dasharray: 95 1505;
  animation: eeg-loop 5.8s linear infinite;
}
@keyframes eeg-loop {
  to { stroke-dashoffset: -1600; }
}

/* ============ Specimen card ============ */
.specimen {
  position: relative; z-index: 2;
  width: 100%; max-width: 400px; justify-self: end;
}
.specimen__float {
  position: relative;
  animation: float-card 5s ease-in-out infinite;
}
.specimen__card {
  position: relative;
  border-radius: var(--radius-lg); background: var(--paper);
  border: 1px solid var(--line); padding: 22px 22px 28px; color: var(--ink);
  box-shadow: var(--shadow-lg);
}
@keyframes float-card {
  0%, 100% { transform: translate3d(0, 0, 0); }
  50% { transform: translate3d(0, -8px, 0); }
}

.specimen__head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; }
.specimen__date { font-size: 0.82rem; font-weight: 600; color: var(--ink-muted); }
.specimen__badge {
  font-size: 0.66rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em;
  padding: 6px 12px; border-radius: 999px; background: var(--orange-wash); color: var(--orange-deep);
}

.specimen__pulse {
  height: 58px; margin: 4px -22px 18px;
  width: calc(100% + 44px);
  background: rgba(220, 232, 245, 0.45);
  border-block: 1px solid rgba(46, 96, 161, 0.12);
}
.specimen__pulse svg { width: 100%; height: 100%; display: block; }
.specimen__pulse-track,
.specimen__pulse-beam {
  fill: none; stroke-linecap: round; stroke-linejoin: round;
}
.specimen__pulse-track { stroke: rgba(46, 96, 161, 0.22); stroke-width: 1.8; }
.specimen__pulse-beam {
  stroke: var(--blue); stroke-width: 2.4;
  filter: drop-shadow(0 0 4px rgba(46, 96, 161, 0.35));
  stroke-dasharray: 80 820;
  animation: specimen-pulse-loop 3.6s linear infinite;
}
@keyframes specimen-pulse-loop {
  to { stroke-dashoffset: -900; }
}

.specimen__rows { margin: 0; display: grid; gap: 12px; }
.specimen__row { display: grid; grid-template-columns: 110px 1fr; gap: 10px; align-items: baseline; }
.specimen__row dt { margin: 0; font-size: 0.66rem; font-weight: 700; letter-spacing: 0.07em; text-transform: uppercase; color: var(--ink-faint); }
.specimen__row dd { margin: 0; font-size: 0.95rem; font-weight: 600; }
.specimen__row dd strong { font-size: 1.5rem; font-variant-numeric: tabular-nums; color: var(--blue-dark); }
.specimen__muted { color: var(--ink-faint); font-size: 0.9rem; font-weight: 500; }

.specimen__prompt {
  margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line);
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; font-size: 0.88rem; font-weight: 600; color: var(--ink-muted);
}
.specimen__chips { display: flex; gap: 8px; }
.chip { padding: 7px 15px; border-radius: 11px; font-size: 0.82rem; font-weight: 700; background: var(--sand); border: 1px solid var(--line-strong); }
.chip--yes { background: var(--mint-soft); color: var(--mint-deep); border-color: transparent; }

.specimen__tag {
  position: absolute; bottom: -13px; right: 18px;
  font-size: 0.7rem; font-weight: 700; padding: 7px 13px; border-radius: 999px;
  background: var(--mint); color: #fff; box-shadow: var(--shadow-md);
  white-space: nowrap; z-index: 2;
}

/* ============ Metrics ============ */
.metrics { padding: 48px 0 56px; position: relative; z-index: 3; }
.metrics__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.metric-card {
  border-radius: var(--radius-lg); padding: 26px 22px;
  background: var(--paper); border: 1px solid var(--line); box-shadow: var(--shadow-sm);
  transition: transform 0.25s cubic-bezier(0.23, 1, 0.32, 1), box-shadow 0.25s ease-out;
}
.metric-card:hover { transform: translate3d(0, -6px, 0); box-shadow: var(--shadow-md); }
.metric-card--accent { background: var(--orange); border-color: transparent; color: #fff; }
.metric-card__value {
  margin: 0 0 6px; font-size: 2.3rem; font-weight: 800; letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums; color: var(--blue-dark);
}
.metric-card--accent .metric-card__value { color: #fff; }
.metric-card__label { margin: 0; font-size: 0.95rem; font-weight: 700; }
.metric-card__hint { margin: 4px 0 0; font-size: 0.8rem; color: var(--ink-faint); }
.metric-card--accent .metric-card__hint { color: rgba(255, 255, 255, 0.8); }

/* ============ Features (flat soft fills) ============ */
.features { padding: 48px 0 72px; }
.features__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-tile {
  border-radius: var(--radius-xl); padding: 30px 26px; min-height: 210px;
  border: 1px solid var(--line); box-shadow: var(--shadow-sm); color: var(--ink);
  transition: transform 0.3s cubic-bezier(0.23, 1, 0.32, 1), box-shadow 0.3s ease-out;
}
.feature-tile:hover { transform: translate3d(0, -8px, 0); box-shadow: var(--shadow-lg); }
.feature-tile--mint   { background: var(--green-soft); }
.feature-tile--coral  { background: var(--orange-soft); }
.feature-tile--blue   { background: var(--blue-soft); }
.feature-tile--amber  { background: var(--orange-soft); }
.feature-tile--violet { background: var(--blue-soft); }

.feature-tile__icon {
  display: inline-flex; width: 52px; height: 52px; align-items: center; justify-content: center;
  font-size: 1.5rem; margin-bottom: 18px; background: rgba(255, 255, 255, 0.75);
  border-radius: 15px; border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 6px 16px rgba(30, 58, 95, 0.08);
}
.feature-tile p { margin: 0; color: var(--ink-muted); font-size: 0.94rem; line-height: 1.55; }

/* ============ About + dictionary card ============ */
.about { padding-bottom: 80px; }
.about__grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 32px;
  align-items: start;
}
.about__copy { min-width: 0; }
.about__copy h2 { margin-bottom: 20px; max-width: 22ch; }
.about__lead { color: var(--ink-muted); margin: 0 0 8px; max-width: 52ch; line-height: 1.65; }
.about__list { margin: 24px 0 0; padding: 0; list-style: none; display: grid; gap: 14px; }
.about__list li { padding-left: 26px; position: relative; font-size: 0.96rem; color: var(--ink-muted); line-height: 1.5; }
.about__list li::before {
  content: "✓"; position: absolute; left: 0; top: 2px;
  width: 18px; height: 18px; display: inline-flex; align-items: center; justify-content: center;
  font-size: 0.7rem; font-weight: 800; color: #fff; border-radius: 6px; background: var(--mint);
}

.about__side { display: grid; align-items: stretch; min-width: 0; }

.dict-card {
  border-radius: var(--radius-xl); padding: 42px 38px;
  background: var(--blue-soft); border: 1px solid rgba(46, 96, 161, 0.16); color: var(--ink);
  box-shadow: var(--shadow-sm);
  min-height: 360px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
.dict-card__num { margin: 0 0 20px; font-size: 4rem; line-height: 1; font-weight: 800; letter-spacing: -0.04em; color: rgba(46, 96, 161, 0.28); }
.dict-card__series { margin: 0 0 18px; font-size: 0.74rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--blue-dark); }
.dict-card h3 { font-size: 1.55rem; margin-bottom: 14px; font-weight: 800; line-height: 1.3; }
.dict-card p { margin: 0 0 24px; color: var(--ink-muted); font-size: 1rem; line-height: 1.65; }
.dict-card__tag {
  display: inline-block; font-size: 0.72rem; font-weight: 700; padding: 8px 14px;
  border-radius: 999px; background: rgba(255, 255, 255, 0.72); color: var(--blue-dark);
}

/* ============ Steps ============ */
.steps { padding-bottom: 80px; }
.steps__list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin: 0; padding: 0; list-style: none; }
.step-card {
  border-radius: var(--radius-lg); padding: 26px 22px; background: var(--paper);
  border: 1px solid var(--line); box-shadow: var(--shadow-sm);
  transition: transform 0.25s cubic-bezier(0.23, 1, 0.32, 1); position: relative; overflow: hidden;
}
.step-card::after {
  content: ""; position: absolute; left: 0; top: 0; height: 4px; width: 100%;
  background: var(--blue); transform: scaleX(0); transform-origin: left; transition: transform 0.3s ease-out;
}
.step-card:hover { transform: translate3d(0, -6px, 0); box-shadow: var(--shadow-md); }
.step-card:hover::after { transform: scaleX(1); }
.step-card__num { display: block; margin-bottom: 16px; font-size: 1.9rem; font-weight: 800; color: var(--blue); }
.step-card p { margin: 0; color: var(--ink-muted); font-size: 0.92rem; }

/* ============ Channels ============ */
.channels { padding-bottom: 80px; }
.channels__grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 18px; }
.channel-card {
  border-radius: var(--radius-xl); padding: 36px 32px; background: var(--paper);
  border: 1px solid var(--line); box-shadow: var(--shadow-sm);
  transition: transform 0.25s cubic-bezier(0.23, 1, 0.32, 1);
}
.channel-card:hover { transform: translate3d(0, -4px, 0); box-shadow: var(--shadow-md); }
.channel-card--primary { background: var(--orange); border-color: transparent; color: var(--ink-invert); box-shadow: var(--shadow-md); }
.channel-card p { color: var(--ink-muted); margin: 12px 0 18px; max-width: 48ch; }
.channel-card--primary p { color: var(--ink-invert-muted); }
.channel-card h2 { margin-bottom: 8px; }
.channel-card--primary h2 { color: var(--ink-invert); }
.channel-card__list { margin: 0 0 26px; padding: 0; list-style: none; display: grid; gap: 9px; }
.channel-card__list li { font-size: 0.92rem; color: var(--ink-muted); padding-left: 20px; position: relative; }
.channel-card--primary .channel-card__list li { color: var(--ink-invert-muted); }
.channel-card__list li::before { content: ""; position: absolute; left: 0; top: 0.55em; width: 7px; height: 7px; border-radius: 50%; background: var(--orange); }
.channel-card--primary .channel-card__list li::before { background: #fff; }

/* ============ FAQ ============ */
.faq { padding-bottom: 80px; }
.faq__grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: end;
}
.faq__main { min-width: 0; }
.faq__list,
.faq__side { display: grid; gap: 12px; }
.faq__side { min-width: 0; }
.faq__item {
  border-radius: var(--radius); padding: 0 22px; background: var(--paper);
  border: 1px solid var(--line); box-shadow: var(--shadow-sm);
  transition: border-color 0.25s ease-out;
}
.faq__item[open] { border-color: rgba(46, 96, 161, 0.35); }
.faq__item summary {
  cursor: pointer; font-weight: 700; padding: 18px 0; list-style: none;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after {
  content: "+"; flex-shrink: 0; font-size: 1.3rem; font-weight: 600; color: var(--blue);
  transition: transform 0.3s cubic-bezier(0.23, 1, 0.32, 1);
}
.faq__item[open] summary::after { transform: rotate(45deg); }
.faq__answer {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transform: translate3d(0, -6px, 0);
  transition:
    max-height 0.42s cubic-bezier(0.23, 1, 0.32, 1),
    opacity 0.24s ease-out,
    transform 0.42s cubic-bezier(0.23, 1, 0.32, 1);
}
.faq__item[open] .faq__answer {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}
.faq__answer > p { margin: 0; padding-bottom: 18px; color: var(--ink-muted); font-size: 0.94rem; line-height: 1.6; }

/* ============ CTA ============ */
.cta-panel { padding-bottom: 96px; }
.cta-panel__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 32px; flex-wrap: wrap; padding: 40px 44px; border-radius: var(--radius-xl);
  background: var(--paper); border: 1px solid var(--line); box-shadow: var(--shadow-sm);
}
.cta-panel__copy { flex: 1; min-width: 240px; max-width: 560px; }
.cta-panel__copy p { margin: 10px 0 0; color: var(--ink-muted); }
.cta-panel__actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

/* ============ Footer ============ */
.site-footer { border-top: 1px solid var(--line); padding: 36px 0 52px; background: var(--cream-2); }
.site-footer__inner { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 24px; }
.footer-brand {
  display: flex; align-items: center; gap: 16px;
  text-decoration: none; color: inherit; max-width: min(100%, 420px);
}
.footer-brand__logo { height: 36px; width: auto; display: block; flex-shrink: 0; }
.footer-brand__text { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.footer-brand__product { font-weight: 700; font-size: 0.95rem; color: var(--blue-dark); line-height: 1.3; }
.footer-brand__meta { font-size: 0.8rem; color: var(--ink-muted); line-height: 1.4; }
.site-footer__nav { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.site-footer__nav a { text-decoration: none; font-size: 0.875rem; font-weight: 600; color: var(--ink-muted); transition: color 0.15s; }
.site-footer__nav a:hover { color: var(--blue); }

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .metrics__grid { grid-template-columns: repeat(2, 1fr); }
  .features__grid { grid-template-columns: repeat(2, 1fr); }
  .steps__list { grid-template-columns: repeat(2, 1fr); }
  .faq__grid { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: fixed; top: 74px; right: 16px; left: 16px;
    flex-direction: column; align-items: stretch; gap: 4px;
    padding: 12px; border-radius: var(--radius-lg);
    background: var(--paper); border: 1px solid var(--line);
    box-shadow: var(--shadow-lg);
    opacity: 0; visibility: hidden; transform: translate3d(0, -8px, 0);
    transition: opacity 0.25s ease-out, transform 0.25s ease-out, visibility 0.25s;
    z-index: 50;
  }
  .site-nav.is-open {
    opacity: 1; visibility: visible; transform: none;
  }
  .site-nav a { width: 100%; text-align: left; }
  .site-nav .btn { justify-content: center; margin-top: 4px; }

  .hero { grid-template-columns: 1fr; gap: 36px; padding-top: 40px; }
  .specimen { order: -1; max-width: 400px; margin-inline: auto; justify-self: center; width: 100%; }
  .about__grid { grid-template-columns: 1fr; }
  .about__copy h2 { max-width: none; }
  .channels__grid { grid-template-columns: 1fr; }
  .cta-panel__inner { flex-direction: column; align-items: flex-start; }
  .cta-panel__actions .btn { width: 100%; }
  .eeg { opacity: 0.28; }
}

@media (max-width: 600px) {
  .wrap { width: min(100% - 24px, var(--wrap)); }
  .features__grid, .metrics__grid, .steps__list { grid-template-columns: 1fr; }
  .specimen__row { grid-template-columns: 1fr; gap: 4px; }
  .hero__actions .btn { width: 100%; }
  .specimen__prompt { flex-direction: column; align-items: flex-start; }
  .cta-panel__inner { padding: 32px 24px; }
  .footer-brand { align-items: flex-start; }
  h1 { font-size: clamp(1.9rem, 8vw, 2.6rem); }
  .brand__logo { height: 34px; }
  .brand__product { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .aurora__blob,
  .specimen__float { animation: none; }
  .eeg__beam,
  .specimen__pulse-beam { animation: none; stroke-dashoffset: 0; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .feature-tile, .metric-card, .step-card, .channel-card { transition: none; }
  .faq__answer { transition: none; }
  .site-nav { transition: none; }
}