.exp-hero{padding:78px max(7vw,30px) 55px;background:linear-gradient(135deg,#f5fbff,#fff)}
.exp-hero h1{font-size:clamp(42px,6vw,72px);line-height:1.02;letter-spacing:-.045em;margin:0;max-width:900px}.exp-hero h1 span{color:var(--blue)}.exp-hero p{max-width:760px;color:var(--muted);font-size:18px}.exp-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:38px}.exp-card{border:1px solid var(--line);border-radius:20px;padding:26px;background:#fff;display:flex;flex-direction:column;min-height:330px}.exp-card .num{font-size:12px;font-weight:900;letter-spacing:.14em;color:var(--blue2)}.exp-card h2{font-size:28px;line-height:1.1;margin:10px 0 6px}.exp-card .path{font-weight:900;color:var(--blue2);font-size:13px}.exp-card p{color:var(--muted)}.exp-card .meta{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0 12px}.exp-card .meta span,.lesson-meta span{background:#eef7fd;border:1px solid #d6e9f7;border-radius:999px;padding:6px 10px;font-size:12px;font-weight:800}.exp-card .mini{font-size:14px;margin:4px 0}.exp-card .button{margin-top:auto;align-self:flex-start}.exp-card.coming .button{opacity:.55;pointer-events:none}.lesson-hero{padding:65px max(7vw,30px) 48px;background:linear-gradient(135deg,#fff 45%,#eef9ff)}.lesson-hero h1{font-size:clamp(42px,6vw,70px);line-height:1.02;letter-spacing:-.045em;margin:0}.lesson-hero .subtitle{font-size:20px;color:var(--blue2);font-weight:850;margin:12px 0}.lesson-meta{display:flex;gap:8px;flex-wrap:wrap;margin-top:22px}.lesson{max-width:980px;margin:auto;padding:58px 30px 90px}.lesson section{margin:0 0 52px}.lesson h2{font-size:32px;letter-spacing:-.025em;margin:0 0 16px}.lesson h3{font-size:20px;margin:24px 0 10px}.lesson p,.lesson li{color:#4f6476}.lesson-callout{background:#f2f9fe;border:1px solid #d5eaf8;border-radius:16px;padding:20px 22px}.lesson-wiring{background:var(--ink);color:white;border-radius:18px;padding:24px}.lesson-wiring p,.lesson-wiring li{color:#c5d8e5}.wireline{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;background:#0b2a40;border-radius:10px;padding:13px 15px;margin:10px 0;color:white}.lesson .check{font-weight:850;color:var(--ink)}.code-step{background:#071b2b;color:#eaf7ff;border-radius:18px;padding:24px}.code-step h2,.code-step p{color:inherit}.code-step code{color:#80caff}.next-challenge{border:2px solid #b9ddf6;border-radius:18px;padding:24px}.breadcrumb{font-size:13px;font-weight:800;margin-bottom:20px}.breadcrumb a{color:var(--blue2);text-decoration:none}.lesson-nav{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:60px}.parts{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;padding:0;list-style:none}.parts li{border:1px solid var(--line);border-radius:12px;padding:12px 14px}.learn-list li{margin:8px 0}.experiment-cta{margin:0 max(4vw,18px) 50px;padding:45px max(5vw,30px);border-radius:26px;background:var(--ink);color:white}.experiment-cta p{color:#bdd2e1;max-width:720px}@media(max-width:700px){.exp-grid{grid-template-columns:1fr}.parts{grid-template-columns:1fr}.exp-hero{padding:52px 22px 38px}.lesson-hero{padding:45px 22px 36px}.lesson{padding:42px 22px 70px}.exp-card{min-height:0}}

.lesson-wiring .lesson-callout{color:var(--ink)}.lesson-wiring .lesson-callout b{color:var(--ink)}


/* Real hardware reference photos */
.module-photo{margin:18px auto 28px;max-width:520px;text-align:center}
.module-photo img{display:block;width:100%;max-height:320px;object-fit:contain;border-radius:16px;background:#fff;box-shadow:0 10px 28px rgba(0,0,0,.18)}
.module-photo figcaption{margin-top:9px;font-weight:700;opacity:.82}
@media(max-width:640px){.module-photo{margin:14px auto 22px;max-width:88%}.module-photo img{max-height:260px;border-radius:12px}}

/* R8 v4: consistent real-module photo size across all experiments */
.module-photo{
  width:100% !important;
  max-width:360px !important;
  margin:14px auto 22px !important;
  text-align:center !important;
}
.module-photo img{
  display:block !important;
  width:100% !important;
  max-width:360px !important;
  height:auto !important;
  max-height:240px !important;
  object-fit:contain !important;
  margin:0 auto !important;
}
@media (max-width:600px){
  .module-photo{
    max-width:300px !important;
  }
  .module-photo img{
    max-width:300px !important;
    max-height:220px !important;
  }
}