:root {
  --bg: #05070b;
  --panel: rgba(16, 22, 31, 0.72);
  --text: #f5f7fb;
  --muted: #9aa6b5;
  --line: rgba(255,255,255,.10);
  --accent: #69c9ff;
  --accent-2: #8ef0c8;
  --max: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; color: var(--text); line-height: 1.7;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", "PingFang SC", sans-serif;
  background: radial-gradient(circle at 10% 0, rgba(105,201,255,.12), transparent 28%), linear-gradient(180deg, #05070b, #090d13 45%, #05070b 100%);
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.wrap { width: min(100% - 48px, var(--max)); margin: 0 auto; }
.glass { background: linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.03)); border: 1px solid var(--line); backdrop-filter: blur(18px); box-shadow: 0 28px 80px rgba(0,0,0,.36); }
.detail-progress { position: fixed; left: 0; top: 0; width: 100%; height: 3px; z-index: 100; background: rgba(255,255,255,.03); }
.detail-progress span { display: block; width: 0; height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
.detail-nav {
  position: sticky; top: 14px; z-index: 90; width: min(100% - 48px, var(--max)); margin: 14px auto 0; padding: 12px 18px;
  display: flex; justify-content: space-between; align-items: center; gap: 16px; border-radius: 999px;
  background: rgba(6,9,14,.76); border: 1px solid rgba(255,255,255,.08); backdrop-filter: blur(18px);
}
.detail-brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 700; }
.detail-brand img { width: 34px; height: 34px; border-radius: 10px; object-fit: cover; }
.detail-nav nav { display: flex; gap: 24px; color: var(--muted); font-size: 14px; }
.detail-particle-surface { position: relative; overflow: hidden; }
.detail-particle-canvas { position: absolute; inset: 0; z-index: 1; width: 100%; height: 100%; display: block; pointer-events: none; opacity: .94; }
.detail-particle-canvas.is-fallback { opacity: 0; }
.detail-particle-surface > .detail-hero { position: relative; z-index: 2; }
.detail-hero { min-height: calc(100svh - 70px); display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 34px; align-items: center; padding: 72px 0 42px; }
.eyebrow { margin: 0 0 16px; color: var(--muted); font: 700 12px/1 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .16em; }
h1, h2 { margin: 0; letter-spacing: -.06em; }
h1 { font-size: clamp(48px, 6.6vw, 86px); line-height: .96; }
h2 { font-size: clamp(34px, 5vw, 66px); }
.lead { margin: 24px 0 0; color: var(--muted); max-width: 620px; font-size: 18px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn { padding: 13px 18px; border-radius: 999px; border: 1px solid rgba(255,255,255,.14); font-weight: 600; }
.btn.primary { background: linear-gradient(135deg, rgba(105,201,255,.22), rgba(142,240,200,.12)); }
.btn.ghost { background: rgba(255,255,255,.04); }
.hero-visual {
  position: relative;
  aspect-ratio: 1 / 1;
  padding: 16px;
  border: 1px solid rgba(255,255,255,.10);
  border-radius: 27%;
  overflow: hidden;
  background: rgba(255,255,255,.04);
  box-shadow: 0 48px 110px rgba(0,0,0,.40), inset 0 1px rgba(255,255,255,.08);
}
.hero-visual img { width: 100%; height: 100%; object-fit: contain; }
.hero-visual .ultrasonic-concept-image { object-position: center; }
.visual-label {
  position: absolute;
  left: 50%;
  bottom: 18px;
  z-index: 6;
  max-width: calc(100% - 40px);
  padding: 8px 11px;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 999px;
  color: rgba(255,255,255,.72);
  background: rgba(8,12,18,.68);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font: 700 9px/1 ui-monospace,SFMono-Regular,Menlo,monospace;
  letter-spacing: .08em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transform: translateX(-50%);
}
section { padding: 92px 0; }
.title-row { margin-bottom: 30px; }
.overview-grid, .engineering-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.engineering-grid { grid-template-columns: repeat(2, 1fr); }
.panel { padding: 26px; border-radius: 28px; }
.panel span { color: var(--muted); font: 700 12px/1 ui-monospace, SFMono-Regular, Menlo, monospace; }
.panel h3 { margin: 16px 0 12px; font-size: 28px; letter-spacing: -.04em; }
.panel p, .panel li { color: var(--muted); }
.panel ul { margin: 0; padding-left: 1.15em; }
.engineering-loop { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; margin-top: 16px; }
.loop-step { padding: 22px; border-radius: 24px; }
.loop-step span { color: var(--accent); font: 700 10px/1 ui-monospace,SFMono-Regular,Menlo,monospace; letter-spacing: .1em; }
.loop-step strong { display: block; margin: 24px 0 8px; font-size: 24px; letter-spacing: -.035em; }
.loop-step p { margin: 0; color: var(--muted); font-size: 13px; }
.gallery-grid { display: grid; grid-template-columns: minmax(0, 9fr) minmax(0, 16fr); align-items: start; gap: 18px; }
.gallery-card { margin: 0; border-radius: 28px; overflow: hidden; }
.gallery-card img { display: block; width: 100%; height: auto; object-fit: contain; }
.gallery-card figcaption { padding: 14px 18px; color: var(--muted); font-size: 14px; }
.detail-footer { padding: 24px 0 38px; display: flex; justify-content: space-between; gap: 16px; color: var(--muted); font-size: 12px; }
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .8s ease, transform .8s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (max-width: 980px) {
  .detail-hero, .overview-grid, .engineering-grid, .gallery-grid { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .wrap, .detail-nav { width: min(100% - 24px, var(--max)); }
  .detail-nav { top: 10px; padding: 10px 14px; }
  .detail-nav nav { display: none; }
  section { padding: 70px 0; }
  .panel { padding: 22px; border-radius: 24px; }
  .detail-footer { flex-direction: column; }
}

.detail-facts { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.detail-facts span { padding: 7px 10px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); background: rgba(255,255,255,.035); font: 11px/1 ui-monospace,SFMono-Regular,Menlo,monospace; }
:where(a,button):focus-visible { outline: 3px solid rgba(105,201,255,.82); outline-offset: 3px; }

@media (max-width: 760px) {
  .detail-hero { min-height: auto; padding: 72px 0 34px; gap: 24px; }
  .detail-hero h1 { font-size: clamp(36px, 11vw, 48px); line-height: .98; }
  .lead { margin-top: 18px; font-size: 15px; line-height: 1.7; }
  .detail-facts { margin-top: 16px; gap: 6px; }
  .detail-facts span { padding: 6px 8px; font-size: 10px; }
  .cta-row { margin-top: 20px; }
  .cta-row .btn { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; }
  .cta-row .btn.primary { flex: 1; }
  .cta-row .btn.ghost { display: none; }
  .hero-visual { aspect-ratio: 1 / 1; padding: 8px; border-radius: 27%; }
  .hero-visual img { object-position: center; }
  section { padding: 54px 0; }
  h2 { font-size: clamp(30px, 9vw, 40px); line-height: 1.04; }
  .title-row { margin-bottom: 22px; }
  .panel { padding: 19px; }
  .panel h3 { margin: 12px 0 8px; font-size: 23px; }
  .panel p, .panel li { font-size: 14px; line-height: 1.65; }
  .gallery-card { border-radius: 22px; }
  .visual-label { bottom: 12px; font-size: 8px; }
  .engineering-loop { grid-template-columns: 1fr; gap: 10px; }
  .loop-step { padding: 18px; border-radius: 22px; }
  .loop-step strong { margin-top: 18px; font-size: 21px; }
}

/* Motion polish */
.detail-nav { transition: background .4s ease, border-color .4s ease, box-shadow .4s ease, transform .4s cubic-bezier(.16,1,.3,1); }
.detail-nav.scrolled { background: rgba(6,9,14,.9); border-color: rgba(255,255,255,.14); box-shadow: 0 16px 48px rgba(0,0,0,.3); transform: translateY(-2px) scale(.993); }
.reveal { opacity:0; transform:translate3d(0,34px,0) scale(.985); filter:blur(8px); transition:opacity .9s cubic-bezier(.16,1,.3,1), transform .9s cubic-bezier(.16,1,.3,1), filter .9s cubic-bezier(.16,1,.3,1); }
.reveal.in { opacity:1; transform:none; filter:blur(0); }
.hero-visual img, .gallery-card img { transition: transform 1.2s cubic-bezier(.16,1,.3,1); }
.hero-visual:hover img, .gallery-card:hover img { transform:scale(1.025); }
.panel, .gallery-card { transition: transform .6s cubic-bezier(.16,1,.3,1), border-color .5s ease, box-shadow .6s ease; }
.panel:hover, .gallery-card:hover { transform:translateY(-5px); border-color:rgba(255,255,255,.16); box-shadow:0 32px 80px rgba(0,0,0,.34); }


/* ===== Apple-inspired slow liquid glass v2 ===== */
:root { --detail-ease: cubic-bezier(.16,1,.3,1); }
.glass {
  --glass-x: 50%;
  --glass-y: 0%;
  position: relative;
  isolation: isolate;
  background:
    radial-gradient(circle at var(--glass-x) var(--glass-y), rgba(255,255,255,.12), transparent 30%),
    linear-gradient(145deg, rgba(255,255,255,.095), rgba(255,255,255,.04) 48%, rgba(255,255,255,.022));
  border-color: rgba(255,255,255,.16);
  box-shadow: 0 26px 78px rgba(0,0,0,.29), inset 0 1px 0 rgba(255,255,255,.12), inset 0 -1px 0 rgba(255,255,255,.03);
  backdrop-filter: blur(30px) saturate(165%);
  -webkit-backdrop-filter: blur(30px) saturate(165%);
}
.glass::before {
  content: ""; position: absolute; inset: 1px; border-radius: inherit; z-index: 4; pointer-events: none;
  background: linear-gradient(135deg, rgba(255,255,255,.15), transparent 24%, transparent 72%, rgba(255,255,255,.03)), radial-gradient(ellipse at 22% -8%, rgba(255,255,255,.20), transparent 36%);
  mix-blend-mode: screen; opacity: .68; transition: opacity 1.3s var(--detail-ease);
}
.glass:hover::before { opacity: .92; }
.detail-nav {
  background: radial-gradient(circle at 24% -40%, rgba(255,255,255,.15), transparent 38%), rgba(8,12,18,.56);
  border-color: rgba(255,255,255,.15);
  box-shadow: 0 14px 42px rgba(0,0,0,.19), inset 0 1px 0 rgba(255,255,255,.10);
  backdrop-filter: blur(32px) saturate(170%);
  -webkit-backdrop-filter: blur(32px) saturate(170%);
  transition: background .85s var(--detail-ease), border-color .85s var(--detail-ease), box-shadow .85s var(--detail-ease), transform .85s var(--detail-ease);
}
.detail-nav.scrolled { background: rgba(8,12,18,.70); border-color: rgba(255,255,255,.20); transform: translateY(-1px) scale(.995); }
.reveal { opacity:0; transform:translate3d(0,42px,0) scale(.982); filter:blur(10px); transition:opacity 1.45s var(--detail-ease), transform 1.45s var(--detail-ease), filter 1.35s var(--detail-ease); }
.hero-visual img, .gallery-card img { transition: transform 1.9s var(--detail-ease); }
.hero-visual:hover img, .gallery-card:hover img { transform:scale(1.015); }
.panel, .gallery-card { transition: transform 1.05s var(--detail-ease), border-color 1s var(--detail-ease), box-shadow 1.05s var(--detail-ease); }
.panel:hover, .gallery-card:hover { transform:translateY(-4px) scale(1.004); border-color:rgba(255,255,255,.20); box-shadow:0 34px 92px rgba(0,0,0,.30), inset 0 1px 0 rgba(255,255,255,.12); }


/* Mobile refinement */
@media (max-width: 760px) {
  body { line-height: 1.62; }
  .detail-brand { font-size: 15px; }
  h1 { font-size: clamp(36px, 11vw, 52px); }
  h2 { font-size: clamp(28px, 9vw, 40px); line-height: 1.02; }
  .lead, .panel p, .panel li, .gallery-card figcaption { font-size: 15px; line-height: 1.75; }
  .detail-hero { min-height: auto; padding: 96px 0 24px; gap: 24px; }
  .cta-row { gap: 10px; }
  .cta-row .btn { flex: 1 1 100%; text-align: center; justify-content: center; }
  .panel h3 { font-size: 24px; }
}

/* Scroll progress lives at the bottom to avoid looking like a page-loading bar. */
.detail-progress { top: auto; bottom: 0; }

/* Size the project title against its own column rather than the viewport.
   Five Chinese characters fit the first line, leaving the complete noun on
   the second line; translated English titles retain normal word wrapping. */
.detail-hero .hero-copy { min-width: 0; container-type: inline-size; }
.detail-hero h1 {
  font-size: clamp(36px, 6.2vw, 76px);
  line-height: 1.12;
  text-wrap: balance;
}
.detail-hero h1:lang(zh) {
  max-inline-size: 5em;
  text-wrap: wrap;
}
@supports (font-size: 1cqi) {
  .detail-hero h1 { font-size: clamp(36px, 13.5cqi, 76px); }
}

/* Keep the complete exhibition board and group photograph visible. */
.gallery-card:hover img { transform: none; }

.signal-flow { list-style:none; display:flex; flex-wrap:wrap; gap:12px; padding:24px 0; margin:0; align-items:center; }
.signal-flow li { border:1px solid var(--line); border-radius:14px; padding:12px 16px; font-size:13px; }
.signal-flow li:not(:last-child)::after { content:" →"; color:var(--accent); }