/* Evidence first: a quiet product cover and legible, navigable research chapters. */
:root {
  --teal: #17655f;
  --teal-dark: #104b46;
  --purple: #465c66;
  --purple-light: #526b78;
  --bg: #fcfcfa;
  --bg2: #f1f3ef;
  --bg3: #edf1ed;
  --text: #1e2b29;
  --text-dim: #5c6864;
  --border: #dbe2dc;
  --shadow: none;
  --shadow-lg: 0 8px 24px rgba(29,53,44,.06);
}
html { scroll-padding-top: 132px; }
button, input, select { font: inherit; }
:focus-visible { outline: 3px solid var(--teal); outline-offset: 5px; }
.skip-link { position: fixed; z-index: 3000; top: 12px; left: 16px; padding: 12px 18px; background: var(--text); color: white; transform: translateY(-180%); border-radius: 10px; }
.skip-link:focus { transform: none; }
nav { background: rgba(252,252,250,.96); box-shadow: none; }
nav .inner { max-width: 1280px; height: auto; min-height: 100px; flex-wrap: wrap; padding: 14px 40px 0; gap: 12px; }
nav .logo img { height: 24px; }
nav .logo span { font-size: 13px; font-weight: 600; letter-spacing: 0; }
nav ul { flex-basis: 100%; justify-content: space-between; gap: 12px; }
nav ul a { display: block; padding: 0 0 11px; text-transform: none; font-size: 13px; letter-spacing: 0; border-bottom: 2px solid transparent; }
nav ul a.active { border-color: var(--teal); }
.hamburger { border: 0; background: transparent; width: 44px; height: 44px; justify-content: center; align-items: center; }
.hero { min-height: 0; padding: 0; background: var(--bg); }
.hero::before { display: none; }
.hero-content { display: grid; grid-template-columns: 1.05fr 1fr; align-items: center; gap: 42px; max-width: 1280px; width: 100%; padding: 170px 40px 64px; text-align: left; }
.hero-copy { min-width: 0; }
.hero-badge { padding: 0; border: 0; border-radius: 0; font-size: 10px; line-height: 1.7; letter-spacing: 1.2px; margin-bottom: 24px; }
.hero-badge .dot { flex-shrink: 0; animation: none; }
.hero h1 { font-size: clamp(40px,4.5vw,62px); font-weight: 650; line-height: 1.04; letter-spacing: -.045em; color: var(--text); background: none; -webkit-text-fill-color: currentColor; max-width: 610px; margin-bottom: 24px; }
.hero .subtitle { font-size: 17px; font-weight: 400; line-height: 1.7; margin: 0 0 28px; max-width: 550px; }
.hero-cta { justify-content: flex-start; gap: 10px; }
.btn { border-radius: 10px; padding: 12px 22px; min-height: 46px; transition: background .2s, border-color .2s; }
.btn-primary:hover { transform: none; box-shadow: none; }
.hero-object { background: #fff; border: 1px solid var(--border); border-radius: 26px; padding: 26px 12px; overflow: hidden; }
.hero-object img { display: block; width: 100%; height: auto; }
.hero-stats { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 0; margin: 10px 0 0; padding-top: 30px; border-top: 1px solid var(--border); }
.hero-stat { text-align: left; padding: 0 24px; border-left: 1px solid var(--border); }
.hero-stat:first-child { padding-left: 0; border-left: 0; }
.hero-stat .num { color: var(--teal); background: none; -webkit-text-fill-color: currentColor; font-size: 40px; font-weight: 600; line-height: 1.1; letter-spacing: -.04em; font-variant-numeric: tabular-nums; }
.hero-stat .label { text-transform: none; font-size: 13px; letter-spacing: 0; margin-top: 10px; }
section { padding: 84px 40px; }
.section-label { padding: 0; background: transparent; font-size: 11px; letter-spacing: 1.5px; }
.section-title { font-weight: 650; letter-spacing: -.035em; font-size: clamp(30px,3.7vw,46px); }
.section-desc { margin-bottom: 36px; font-size: 17px; }
.proto-info h3, .sub-h { font-weight: 650; letter-spacing: -.025em; }
.proto-header { gap: 48px; }
.proto-hero-img, .gallery-item, .card, .result-card, .spec-card, .stl-stage, .poster-display { border-radius: 18px; }
.card:hover, .gallery-item:hover { transform: none; box-shadow: none; border-color: var(--teal); }
.spec-item { background: var(--card); border-radius: 12px; padding: 14px; }
.result-card { padding: 24px; }
.gallery { gap: 18px; }
.gallery-item .caption { line-height: 1.65; padding: 14px 16px; }
.collapsible-header { min-height: 52px; padding: 16px 20px; background: var(--card); border-radius: 12px; }
.collapsible-header.open { border-color: var(--teal); }
.stl-stage { gap: 22px; padding: 20px; }
.stl-part-btn { min-height: 48px; background: var(--bg); border-radius: 10px; }
#stlCanvasWrap { background: #f0f3ef; }
.lightbox { background: rgba(252,252,250,.98); }
.lightbox .close { border: 1px solid var(--border); }
.fade-in { opacity: 1; transform: none; transition: none; }
@media(max-width:1180px) {
  nav .inner { min-height: 72px; padding: 12px 24px; gap: 8px; }
  nav ul { top: 72px; padding: 12px 24px; background: var(--bg); max-height: calc(100dvh - 72px); }
  nav ul a { padding: 12px 0; border-bottom: 0; }
  nav ul a.active { font-weight: 700; }
  html { scroll-padding-top: 96px; }
  .hero-content { padding-top: 130px; gap: 32px; }
}
@media(max-width:860px) {
  .hero-content { grid-template-columns: 1fr; max-width: 760px; padding-top: 116px; gap: 32px; }
  .hero h1 { max-width: 600px; font-size: clamp(40px,7vw,56px); }
  .hero-object { max-width: 620px; padding: 20px; }
  .hero .subtitle { max-width: 640px; }
  .hero-stats { margin-top: 0; }
}
@media(max-width:600px) {
  section { padding: 56px 20px; }
  nav .inner { padding-inline: 20px; }
  nav .logo { gap: 9px; }
  nav .logo span { font-size: 12px; }
  .hero-content { padding: 108px 20px 48px; gap: 28px; }
  .hero-badge { font-size: 9px; letter-spacing: .9px; }
  .hero h1 { font-size: 42px; }
  .hero .subtitle { font-size: 16px; }
  .hero-object { padding: 20px 8px; border-radius: 20px; }
  .hero-stats { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 26px 0; }
  .hero-stat { padding: 0 0 0 20px; }
  .hero-stat:nth-child(odd) { padding-left: 0; border-left: 0; }
  .hero-stat .num { font-size: 34px; }
  .hero-stat .label { font-size: 12px; }
  .hero-cta .btn { flex: none; }
  .grid-3 { grid-template-columns: 1fr; }
  .stl-stage { padding: 12px; }
  .stl-parts { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); }
}
@media(prefers-reduced-motion:reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}