:root {
  --accent-dim: rgba(177,4,200,0.10);
  --accent-light: #d635ef;
  --surface: #f3f0f6;
  --navy: #0a0e1a;
  --navy-mid: #111827;
  --gold: #F4B300;
  --violet: #B87AFF;
  --serif: 'Playfair Display', Georgia, serif;
}
body { background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 16px; line-height: 1.6; overflow-x: hidden; }

/* ── Nav ── */

.nav-back:hover svg { transform:translateX(-3px); }

/* ── Hero ── */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  padding: 9rem 4rem 5rem;
  position: relative;
  overflow: hidden;
  background: var(--navy);
}
/* Subtle grid on dark bg */
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
  linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 60px 60px;
}
/* Accent orb — left side for text legibility */
.hero-orb {
  position: absolute;
  width: 700px; height: 700px;
  background: radial-gradient(circle, rgba(177,4,200,.12) 0%, transparent 65%);
  top: 50%; right: -100px;
  transform: translateY(-50%);
  pointer-events: none;
}
/* Gold accent orb */
.hero-orb-2 {
  position: absolute;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(244,179,0,.07) 0%, transparent 65%);
  top: 10%; left: -80px;
  pointer-events: none;
}

.hero-content { position: relative; z-index: 2; max-width: 580px; }

.hero-eyebrow { font-family:var(--mono);font-size:.75rem;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);margin-bottom:1.25rem;display:flex;align-items:center;gap:.75rem;opacity:0;animation:fadeUp .8s ease .1s forwards; }
.hero-eyebrow::before { content:'';width:28px;height:1px;background:var(--accent);display:block; }

.hero-title { font-family:var(--serif);font-size:clamp(2.8rem,5vw,5.5rem);font-weight:900;line-height:.95;letter-spacing:-.04em;color:white;margin-bottom:.75rem;opacity:0;animation:fadeUp .8s ease .25s forwards; }
.hero-title em { font-style:italic;color:var(--accent); }

.hero-tagline { font-family:var(--serif);font-style:italic;font-size:1.15rem;color:rgba(255,255,255,.5);line-height:1.55;max-width:460px;margin-bottom:2rem;opacity:0;animation:fadeUp .8s ease .4s forwards; }

.meta-row { display:flex;gap:2rem;flex-wrap:wrap;margin-bottom:2.5rem;opacity:0;animation:fadeUp .8s ease .55s forwards; }
.meta-item { display:flex;flex-direction:column;gap:.2rem; }
.meta-label { font-family:var(--mono);font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:rgba(255,255,255,.3); }
.meta-value { font-size:.875rem;font-weight:500;color:rgba(255,255,255,.8); }

.hero-actions { display:flex;align-items:center;gap:1.5rem;opacity:0;animation:fadeUp .8s ease .7s forwards; }
.btn-primary { display:inline-flex;align-items:center;gap:.6rem;background:var(--accent);color:white;padding:.85rem 1.8rem;border-radius:6px;text-decoration:none;font-size:.875rem;font-weight:500;letter-spacing:.02em;transition:background .2s,transform .2s,box-shadow .2s;box-shadow:0 4px 20px rgba(177,4,200,.35); }
.btn-primary:hover { background:var(--accent-light);transform:translateY(-2px);box-shadow:0 8px 28px rgba(177,4,200,.45); }
.btn-ghost-light { font-size:.875rem;font-weight:500;color:rgba(255,255,255,.6);text-decoration:none;border-bottom:1px solid rgba(255,255,255,.2);padding-bottom:2px;transition:color .2s,border-color .2s; }
.btn-ghost-light:hover { color:white;border-color:rgba(255,255,255,.6); }

/* Hero right — visual */
.hero-visual { position:relative;z-index:2;display:flex;align-items:center;justify-content:center;opacity:0;animation:fadeIn 1.2s ease .65s forwards; }
.hero-img-wrap { position:relative;width:100%;max-width:460px; }
.hero-main-img { width:100%;border-radius:16px;box-shadow:0 40px 80px rgba(0,0,0,.5);display:block; }

.hero-badge {
  position:absolute;background:rgba(255,255,255,.06);
  backdrop-filter:blur(10px);
  border:1px solid rgba(255,255,255,.1);
  border-radius:12px;padding:.9rem 1.1rem;
}
.hb-top { top:-18px;left:-30px; }
.hb-bot { bottom:20px;right:-30px;display:flex;align-items:center;gap:.75rem; }
.hb-tag { font-family:var(--mono);font-size:.58rem;letter-spacing:.08em;text-transform:uppercase;padding:.2rem .55rem;border-radius:100px;background:var(--accent-dim);color:var(--accent);display:inline-block;margin-bottom:.3rem; }
.hb-num { font-family:var(--serif);font-size:1.4rem;font-weight:900;line-height:1;color:white; }
.hb-num em { font-style:normal;color:var(--accent); }
.hb-lbl { font-size:.68rem;color:rgba(255,255,255,.45); }
.hb-icon { width:36px;height:36px;border-radius:9px;background:rgba(244,179,0,.15);display:flex;align-items:center;justify-content:center;font-size:1rem;flex-shrink:0; }

/* ── Stats strip ── */
.stats-strip { background:var(--ink);display:grid;grid-template-columns:repeat(4,1fr); }
.stat-cell { padding:3rem 2.5rem;border-right:1px solid rgba(255,255,255,.07);transition:background .3s; }
.stat-cell:hover { background:rgba(177,4,200,.06); }
.stat-cell:last-child { border-right:none; }
.stat-n { font-family:var(--serif);font-size:2.6rem;font-weight:900;color:white;line-height:1;letter-spacing:-.03em; }
.stat-n em { font-style:normal;color:var(--accent); }
.stat-lbl { font-family:var(--mono);font-size:.65rem;letter-spacing:.12em;text-transform:uppercase;color:rgba(255,255,255,.35);margin-top:.4rem; }

/* ── Process nav ── */
.process-nav { background:var(--surface);border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);padding:0 4rem;display:flex;overflow-x:auto;position:sticky;top:73px;z-index:90; }
.pnav-item { font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;padding:1.25rem 2rem;color:var(--muted);text-decoration:none;white-space:nowrap;border-bottom:2px solid transparent;transition:color .2s,border-color .2s; }
.pnav-item:hover { color:var(--accent);border-color:var(--accent); }

/* ── Shared layout ── */
.section { padding:6rem 4rem; }
.section-wide { max-width:1160px;margin:0 auto; }
.two-col { display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:start; }
.three-col { display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem; }

.eyebrow { font-family:var(--mono);font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);margin-bottom:1rem;display:flex;align-items:center;gap:.6rem; }
.eyebrow::before { content:'';width:24px;height:1px;background:var(--accent);display:block; }
.section-headline { font-family:var(--serif);font-size:clamp(2rem,3vw,3rem);font-weight:900;letter-spacing:-.03em;line-height:1.1;margin-bottom:1rem; }
.section-headline em { font-style:italic;color:var(--accent); }
.section-sub { font-size:.975rem;color:var(--muted);line-height:1.85;max-width:700px;margin-bottom:3rem; }
.body-text { font-size:.975rem;color:var(--muted);line-height:1.85;margin-bottom:1.25rem; }

/* ── Problem ── */
.problem-section { background:var(--paper); }
.problem-pull {
  font-family:var(--serif);font-size:1.35rem;font-style:italic;
  color:var(--ink);line-height:1.55;
  border-left:3px solid var(--accent);
  padding-left:1.5rem;margin-bottom:2rem;
}
.stat-callout {
  background:var(--ink);border-radius:14px;padding:2rem;
  display:flex;align-items:center;gap:1.5rem;
  margin-bottom:1.25rem;
}
.sc-num { font-family:var(--serif);font-size:2.8rem;font-weight:900;color:white;line-height:1;letter-spacing:-.03em;flex-shrink:0; }
.sc-num em { font-style:normal;color:var(--accent); }
.sc-text { font-size:.9rem;color:rgba(255,255,255,.55);line-height:1.65; }

.solution-statement {
  background:var(--ink);border-radius:14px;padding:2rem;
  position:relative;overflow:hidden;
  margin-top:1rem;
}
.solution-statement::before { content:'"';font-family:var(--serif);font-size:8rem;font-weight:900;color:rgba(255,255,255,.03);position:absolute;top:-1.5rem;right:1rem;line-height:1; }
.ss-label { font-family:var(--mono);font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin-bottom:.75rem; }
.ss-text { font-family:var(--serif);font-size:1.05rem;font-style:italic;color:rgba(255,255,255,.85);line-height:1.65; }

/* ── Discovery ── */
.discovery-section { background:var(--surface); }
.lit-review-card {
  background:white;border-radius:14px;padding:2rem;
  box-shadow:0 2px 12px rgba(14,11,18,.06);
  border-top:3px solid var(--accent);
}
.lrc-num { font-family:var(--serif);font-size:3.5rem;font-weight:900;color:var(--ink);line-height:1;letter-spacing:-.04em;margin-bottom:.25rem; }
.lrc-num em { font-style:normal;color:var(--accent); }
.lrc-label { font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:1rem; }
.lrc-body { font-size:.875rem;color:var(--muted);line-height:1.7; }

.keyword-tags { display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1.25rem; }
.keyword-tag { font-family:var(--mono);font-size:.65rem;letter-spacing:.06em;padding:.3rem .75rem;border-radius:100px;border:1px solid var(--rule);color:var(--muted);background:var(--surface);transition:border-color .2s,color .2s,background .2s; }
.keyword-tag:hover { border-color:var(--accent);color:var(--accent);background:var(--accent-dim); }

/* ── Define ── */
.define-section { background:var(--paper); }

/* 6 tasks grid */
.tasks-grid { display:grid;grid-template-columns:repeat(3,1fr);gap:1.25rem;margin-bottom:3rem; }
.task-card {
  background:var(--surface);border-radius:12px;padding:1.5rem;
  border-bottom:3px solid transparent;
  transition:transform .3s,box-shadow .3s,border-color .3s;
}
.task-card:hover { transform:translateY(-4px);box-shadow:0 12px 32px rgba(14,11,18,.08);border-color:var(--accent); }
.task-num { font-family:var(--mono);font-size:.65rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin-bottom:.6rem; }
.task-title { font-family:var(--serif);font-size:1rem;font-weight:700;margin-bottom:.5rem; }
.task-body { font-size:.82rem;color:var(--muted);line-height:1.6; }
.task-img-wrap { margin-top:.75rem;border-radius:8px;overflow:hidden;border:1px solid var(--rule); }
.task-img { width:100%;display:block; }

/* Design principles */
.principles-grid { display:grid;grid-template-columns:repeat(3,1fr);gap:1.25rem; }
.principle-card {
  background:var(--ink);border-radius:14px;padding:1.75rem;
  position:relative;overflow:hidden;
  transition:transform .3s;
}
.principle-card:hover { transform:translateY(-3px); }
.principle-card::before { content:attr(data-icon);font-size:3.5rem;position:absolute;top:-.5rem;right:1rem;opacity:.1; }
.principle-label { font-family:var(--mono);font-size:.62rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-bottom:.6rem; }
.principle-title { font-family:var(--serif);font-size:1.05rem;font-weight:700;color:white;margin-bottom:.5rem; }
.principle-body { font-size:.82rem;color:rgba(255,255,255,.45);line-height:1.65; }

/* ── Prototype ── */
.prototype-section { background:var(--navy); }
.prototype-section .eyebrow { color:rgba(177,4,200,.85); }
.prototype-section .eyebrow::before { background:rgba(177,4,200,.85); }
.prototype-section .section-headline { color:white; }
.prototype-section .section-sub { color:rgba(255,255,255,.45); }

.proto-specs { display:grid;grid-template-columns:repeat(3,1fr);gap:1.25rem;margin-bottom:3rem; }
.proto-spec-card {
  background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);
  border-radius:14px;padding:1.75rem;
  transition:background .3s,border-color .3s;
}
.proto-spec-card:hover { background:rgba(177,4,200,.06);border-color:rgba(177,4,200,.25); }
.psc-icon { font-size:1.6rem;margin-bottom:.9rem;display:block; }
.psc-title { font-family:var(--serif);font-size:1rem;font-weight:700;color:white;margin-bottom:.5rem; }
.psc-body { font-size:.82rem;color:rgba(255,255,255,.42);line-height:1.65; }
.psc-detail { font-family:var(--mono);font-size:.65rem;letter-spacing:.06em;margin-top:.6rem; }
.psc-detail .gold { color:var(--gold); }
.psc-detail .violet { color:var(--violet); }

.proto-imgs { display:grid;grid-template-columns:2fr 1fr;gap:1.5rem;margin-bottom:3rem;align-items:start; }
.proto-img-card { border-radius:14px;overflow:hidden;border:1px solid rgba(255,255,255,.08);transition:transform .4s,border-color .3s; }
.proto-img-card:hover { transform:translateY(-4px);border-color:rgba(177,4,200,.3); }
.proto-img-card img { width:100%;display:block; }
.proto-img-caption { padding:1rem 1.25rem;font-size:.78rem;color:rgba(255,255,255,.35);border-top:1px solid rgba(255,255,255,.06); }

/* Hardware buttons display */
.hw-buttons { display:flex;gap:1rem;align-items:center;margin-top:1.5rem; }
.hw-btn {
  display:flex;flex-direction:column;align-items:center;gap:.5rem;
  font-family:var(--mono);font-size:.6rem;letter-spacing:.08em;text-transform:uppercase;color:rgba(255,255,255,.4);
}
.hw-btn-circle {
  width:56px;height:56px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-size:1.1rem;
  box-shadow:0 4px 16px rgba(0,0,0,.4);
}
.hw-btn-gold  .hw-btn-circle { background:var(--gold); }
.hw-btn-violet .hw-btn-circle { background:var(--violet); }

/* ── Experiment ── */
.experiment-section { background:var(--surface); }
.conditions-grid { display:grid;grid-template-columns:repeat(3,1fr);gap:1.25rem;margin-bottom:3rem; }
.condition-card {
  background:white;border-radius:14px;padding:1.75rem;
  box-shadow:0 2px 12px rgba(14,11,18,.06);
  position:relative;overflow:hidden;
  transition:transform .3s,box-shadow .3s;
}
.condition-card:hover { transform:translateY(-4px);box-shadow:0 12px 32px rgba(14,11,18,.1); }
.condition-card::after {
  content:'';position:absolute;bottom:0;left:0;right:0;height:3px;
  background:var(--accent);transform:scaleX(0);transform-origin:left;
  transition:transform .4s;
}
.condition-card:hover::after { transform:scaleX(1); }
.cond-n { font-family:var(--serif);font-size:2.5rem;font-weight:900;letter-spacing:-.04em;color:var(--ink);line-height:1;margin-bottom:.25rem; }
.cond-n em { font-style:normal;color:var(--accent); }
.cond-label { font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:.75rem; }
.cond-desc { font-size:.85rem;color:var(--muted);line-height:1.65; }

.measures-row { display:grid;grid-template-columns:repeat(3,1fr);gap:1.25rem; }
.measure-card { background:var(--surface);border-radius:12px;padding:1.5rem; }
.mc-icon { font-size:1.4rem;margin-bottom:.75rem; }
.mc-title { font-family:var(--serif);font-size:.95rem;font-weight:700;margin-bottom:.4rem; }
.mc-body { font-size:.82rem;color:var(--muted);line-height:1.6; }

/* ── Results ── */
.results-section { background:var(--paper); }
.findings-grid { display:grid;grid-template-columns:repeat(3,1fr);gap:1.25rem;margin-bottom:3rem; }
.finding-card {
  background:var(--ink);border-radius:14px;padding:1.75rem;
  position:relative;overflow:hidden;
  transition:transform .3s;
}
.finding-card:hover { transform:translateY(-3px); }
.finding-card::before { content:attr(data-n);font-family:var(--serif);font-size:5rem;font-weight:900;color:rgba(255,255,255,.04);position:absolute;top:-.5rem;right:1rem;line-height:1; }
.fc-label { font-family:var(--mono);font-size:.62rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-bottom:.6rem; }
.fc-title { font-family:var(--serif);font-size:1.05rem;font-weight:700;color:white;margin-bottom:.5rem; }
.fc-body { font-size:.82rem;color:rgba(255,255,255,.45);line-height:1.65; }
.fc-stat { font-family:var(--mono);font-size:.72rem;color:var(--accent);margin-top:.75rem;display:flex;align-items:center;gap:.4rem; }
.fc-stat::before { content:'';width:16px;height:1px;background:var(--accent);display:block; }

.results-imgs { display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin-bottom:3rem; }
.result-img-card { border-radius:14px;overflow:hidden;border:1px solid var(--rule);background:white; }
.result-img-card img { width:100%;display:block; }
.result-img-caption { font-size:.8rem;color:var(--muted);padding:.75rem 1rem;border-top:1px solid var(--rule); }

.proto-mockup-grid { display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem;margin-bottom:3rem; }
.mockup-card { border-radius:14px;overflow:hidden;border:1px solid var(--rule);background:white;transition:transform .3s,box-shadow .3s; }
.mockup-card:hover { transform:translateY(-4px);box-shadow:0 12px 32px rgba(14,11,18,.1); }
.mockup-card img { width:100%;display:block; }
.mockup-caption { font-size:.78rem;color:var(--muted);padding:.75rem 1rem;border-top:1px solid var(--rule); }

/* Next steps */
.next-steps-list { list-style:none;display:flex;flex-direction:column;gap:1rem;margin-top:1.5rem; }
.next-steps-list li {
  display:flex;gap:1rem;align-items:flex-start;
  background:var(--surface);border-radius:10px;padding:1.25rem 1.5rem;
  font-size:.9rem;color:var(--muted);line-height:1.65;
  border-left:3px solid transparent;
  transition:border-color .2s,transform .2s;
}
.next-steps-list li:hover { border-color:var(--accent);transform:translateX(4px); }
.nsl-icon { font-size:1.1rem;flex-shrink:0; }

/* ── Next case study bar ── */
.next-bar { background:var(--ink);padding:5rem 4rem;display:flex;align-items:center;justify-content:space-between;border-top:1px solid rgba(255,255,255,.06); }
.next-label { font-family:var(--mono);font-size:.68rem;letter-spacing:.15em;text-transform:uppercase;color:rgba(255,255,255,.3);margin-bottom:.75rem; }
.next-title { font-family:var(--serif);font-size:2rem;font-weight:700;color:white;letter-spacing:-.03em; }
.next-title em { font-style:italic;color:var(--accent); }
.next-arrow { width:60px;height:60px;border-radius:50%;border:1px solid rgba(255,255,255,.15);display:flex;align-items:center;justify-content:center;color:white;text-decoration:none;transition:background .2s,border-color .2s,transform .2s; }
.next-arrow:hover { background:var(--accent);border-color:var(--accent);transform:translateX(4px); }

/* ── Reveal ── */
.reveal { opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease; }
.reveal.visible { opacity:1;transform:translateY(0); }
.reveal-delay-1 { transition-delay:.1s; }
.reveal-delay-2 { transition-delay:.2s; }
.reveal-delay-3 { transition-delay:.3s; }
.reveal-delay-4 { transition-delay:.4s; }

@keyframes fadeUp { from{opacity:0;transform:translateY(22px)} to{opacity:1;transform:translateY(0)} }
@keyframes fadeIn { from{opacity:0} to{opacity:1} }

/* ── Responsive ── */
@media(max-width:960px){
  nav,.next-bar { padding-left:1.5rem;padding-right:1.5rem; }
  .hero { grid-template-columns:1fr;padding:7rem 1.5rem 3rem; }
  .hero-visual { display:none; }
  .section { padding:4rem 1.5rem; }
  .stats-strip { grid-template-columns:1fr 1fr; }
  .two-col,.results-imgs { grid-template-columns:1fr;gap:2rem; }
  .three-col,.tasks-grid,.principles-grid,.proto-specs,.conditions-grid,.findings-grid,.measures-row,.proto-mockup-grid { grid-template-columns:1fr; }
  .proto-imgs { grid-template-columns:1fr; }
  .process-nav { padding:0 1.5rem;top:61px; }
  footer { flex-direction:column;gap:1.5rem;text-align:center; }
  .next-bar { flex-direction:column;align-items:flex-start;gap:2rem; }
}