/* ===== STEM Lab — shared stylesheet ===== */
:root{
  --primary:#4F46E5;
  --primary-dark:#3730A3;
  --primary-light:#818CF8;
  --teal:#06B6D4;
  --yellow:#FBBF24;
  --coral:#FB7185;
  --bg:#F8FAFC;
  --surface:#FFFFFF;
  --text:#1E293B;
  --text-muted:#64748B;
  --border:#E2E8F0;
  --radius-sm:10px;
  --radius-md:18px;
  --radius-lg:28px;
  --shadow-sm:0 2px 8px rgba(30,41,59,.06);
  --shadow-md:0 8px 24px rgba(30,41,59,.10);
  --shadow-lg:0 20px 48px rgba(79,70,229,.18);
  --container:1200px;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,.brand{font-family:'Baloo 2',system-ui,sans-serif;font-weight:700}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font:inherit;cursor:pointer;border:none;background:none}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}
.section{padding:88px 0}
.section-tight{padding:56px 0}
.section-head{max-width:640px;margin:0 auto 48px;text-align:center}
.eyebrow{
  display:inline-block;padding:6px 16px;border-radius:999px;
  background:rgba(79,70,229,.1);color:var(--primary);
  font-weight:700;font-size:.8rem;letter-spacing:.04em;text-transform:uppercase;
  margin-bottom:14px;
}
.section-head h2{font-size:2.1rem;margin-bottom:12px}
.section-head p{color:var(--text-muted);font-size:1.05rem}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 28px;border-radius:999px;font-weight:700;font-size:.95rem;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease;
  white-space:nowrap;
}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 10px 24px rgba(79,70,229,.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(79,70,229,.4)}
.btn-outline{background:#fff;color:var(--primary);border:2px solid var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff;transform:translateY(-2px)}
.btn-ghost{background:rgba(255,255,255,.15);color:#fff;border:2px solid rgba(255,255,255,.5)}
.btn-ghost:hover{background:#fff;color:var(--primary-dark)}
.btn-sm{padding:9px 18px;font-size:.85rem}
.btn-block{width:100%}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(248,250,252,.85);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
}
.nav{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;max-width:var(--container);margin:0 auto}
.brand{display:flex;align-items:center;gap:10px;font-size:1.3rem;color:var(--text)}
.brand-mark{
  width:40px;height:40px;border-radius:12px;
  background:linear-gradient(135deg,var(--primary),var(--teal));
  display:flex;align-items:center;justify-content:center;color:#fff;flex-shrink:0;
}
.nav-links{display:flex;align-items:center;gap:6px}
.nav-links a{
  padding:10px 16px;border-radius:999px;font-weight:600;font-size:.94rem;color:var(--text-muted);
  transition:background .18s ease,color .18s ease;
}
.nav-links a:hover,.nav-links a.active{background:rgba(79,70,229,.1);color:var(--primary)}
.nav-actions{display:flex;align-items:center;gap:12px}
.nav-toggle{display:none;flex-direction:column;gap:5px;padding:8px}
.nav-toggle span{width:24px;height:2.5px;background:var(--text);border-radius:2px}

@media(max-width:900px){
  .nav-links{
    position:fixed;top:73px;left:0;right:0;bottom:0;background:var(--surface);
    flex-direction:column;align-items:stretch;padding:20px;gap:4px;
    transform:translateY(-110%);opacity:0;transition:transform .25s ease,opacity .25s ease;
    overflow-y:auto;
  }
  .nav-links.open{transform:translateY(0);opacity:1}
  .nav-links a{padding:14px 16px;font-size:1.05rem}
  .nav-toggle{display:flex}
  .nav-actions .btn{display:none}
}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;
  background:radial-gradient(circle at 15% 20%, rgba(79,70,229,.12), transparent 45%),
             radial-gradient(circle at 85% 15%, rgba(6,182,212,.14), transparent 50%),
             var(--bg);
  padding:72px 0 40px;
}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;max-width:var(--container);margin:0 auto;padding:0 24px}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border-radius:999px;
  background:#fff;box-shadow:var(--shadow-sm);font-weight:700;font-size:.85rem;color:var(--primary-dark);margin-bottom:20px;
}
.hero h1{font-size:3rem;line-height:1.12;margin-bottom:20px}
.hero h1 .accent{color:var(--primary);position:relative}
.hero p.lead{font-size:1.15rem;color:var(--text-muted);margin-bottom:32px;max-width:520px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:36px}
.hero-stats{display:flex;gap:32px;flex-wrap:wrap}
.hero-stats div strong{display:block;font-size:1.5rem;font-family:'Baloo 2';color:var(--primary-dark)}
.hero-stats div span{font-size:.85rem;color:var(--text-muted)}
.hero-visual{position:relative;display:flex;align-items:center;justify-content:center}
.hero-visual svg{width:100%;height:auto;max-width:480px}
.floaty{animation:floaty 5s ease-in-out infinite}
.floaty-slow{animation:floaty 7s ease-in-out infinite}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-14px)}}

@media(max-width:900px){
  .hero-inner{grid-template-columns:1fr;text-align:center}
  .hero h1{font-size:2.3rem}
  .hero p.lead{margin:0 auto 32px}
  .hero-cta{justify-content:center}
  .hero-stats{justify-content:center}
}

/* ---------- Page banner (sub pages) ---------- */
.page-banner{
  background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);
  color:#fff;padding:64px 0 56px;text-align:center;position:relative;overflow:hidden;
}
.page-banner h1{font-size:2.4rem;margin-bottom:12px}
.page-banner p{color:rgba(255,255,255,.85);max-width:560px;margin:0 auto;font-size:1.05rem}
.page-banner .eyebrow{background:rgba(255,255,255,.18);color:#fff}

/* ---------- Cards ---------- */
.grid{display:grid;gap:28px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:1000px){.grid-4{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.grid-4,.grid-3,.grid-2{grid-template-columns:1fr}}

.card{
  background:var(--surface);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);
  overflow:hidden;transition:transform .2s ease,box-shadow .2s ease;border:1px solid var(--border);
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-md)}

.feature-card{padding:32px 26px}
.feature-icon{
  width:56px;height:56px;border-radius:16px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--primary),var(--teal));color:#fff;margin-bottom:18px;
}
.feature-card h3{font-size:1.15rem;margin-bottom:8px}
.feature-card p{color:var(--text-muted);font-size:.94rem}

/* Experiment card */
.exp-card{display:flex;flex-direction:column}
.exp-thumb{position:relative;aspect-ratio:4/3;background:#eef2ff;overflow:hidden}
.exp-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.exp-card:hover .exp-thumb img{transform:scale(1.06)}
.exp-tag{
  position:absolute;top:12px;left:12px;padding:5px 12px;border-radius:999px;
  font-size:.72rem;font-weight:700;color:#fff;text-transform:uppercase;letter-spacing:.03em;
}
.tag-physics{background:#4F46E5}
.tag-chemistry{background:#06B6D4}
.tag-math{background:#FBBF24;color:#1E293B}
.tag-biology{background:#22C55E}
.exp-grade{display:inline-flex;align-items:center;gap:4px;font-size:.76rem;font-weight:700;color:var(--primary-dark);background:rgba(79,70,229,.08);padding:3px 10px;border-radius:999px;align-self:flex-start}

.filter-count{opacity:.75;font-weight:700}

.subject-section{margin-bottom:44px}
.subject-section:last-child{margin-bottom:0}
.subject-section-head{display:flex;align-items:center;gap:10px;margin-bottom:18px}
.subject-section-head h3{font-size:1.2rem}
.subject-count-pill{background:var(--primary);color:#fff;font-size:.78rem;font-weight:700;padding:3px 12px;border-radius:999px}
.exp-body{padding:20px;display:flex;flex-direction:column;gap:10px;flex:1}
.exp-body h3{font-size:1.05rem}
.exp-body .exp-sub{font-size:.8rem;color:var(--text-muted);font-style:italic}
.exp-body p{font-size:.88rem;color:var(--text-muted);flex:1}
.exp-actions{display:flex;justify-content:space-between;align-items:center;margin-top:6px}

/* Product / project cards */
.prod-card,.proj-card{display:flex;flex-direction:column}
.prod-media,.proj-media{
  aspect-ratio:16/10;display:flex;align-items:center;justify-content:center;
  color:#fff;position:relative;overflow:hidden;
}
.prod-media svg,.proj-media svg{width:96px;height:96px}
.prod-body,.proj-body{padding:22px}
.prod-body h3,.proj-body h3{font-size:1.15rem;margin-bottom:8px}
.prod-body p,.proj-body p{color:var(--text-muted);font-size:.9rem;margin-bottom:14px}
.prod-specs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}
.spec-chip{background:var(--bg);border:1px solid var(--border);padding:5px 12px;border-radius:999px;font-size:.78rem;color:var(--text-muted)}
.prod-price{font-weight:700;color:var(--primary-dark)}

/* ---------- Filter tabs ---------- */
.filter-bar{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:40px}
.filter-btn{
  padding:10px 20px;border-radius:999px;border:2px solid var(--border);background:#fff;
  font-weight:600;font-size:.88rem;color:var(--text-muted);transition:.18s ease;
}
.filter-btn:hover{border-color:var(--primary-light)}
.filter-btn.active{background:var(--primary);border-color:var(--primary);color:#fff}

/* ---------- CTA banner ---------- */
.cta-banner{
  background:linear-gradient(135deg,var(--primary) 0%,var(--teal) 100%);
  border-radius:var(--radius-lg);padding:56px;text-align:center;color:#fff;
  margin:0 24px;max-width:calc(var(--container) - 48px);margin-inline:auto;
  position:relative;overflow:hidden;
}
.cta-banner h2{font-size:1.9rem;margin-bottom:12px}
.cta-banner p{color:rgba(255,255,255,.9);margin-bottom:28px;max-width:520px;margin-inline:auto}
.cta-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* ---------- Stats bar ---------- */
.stats-bar{background:var(--surface);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.stats-bar .grid-4{padding:40px 0;text-align:center}
.stats-bar strong{display:block;font-size:2rem;font-family:'Baloo 2';color:var(--primary)}
.stats-bar span{color:var(--text-muted);font-size:.9rem}

/* ---------- Modal (experiment viewer) ---------- */
.modal-overlay{
  position:fixed;inset:0;background:rgba(15,23,42,.72);z-index:1000;
  display:none;align-items:center;justify-content:center;padding:20px;backdrop-filter:blur(3px);
}
.modal-overlay.open{display:flex}
.modal-box{
  background:#0f172a;border-radius:var(--radius-md);width:100%;max-width:1000px;
  overflow:hidden;box-shadow:0 30px 80px rgba(0,0,0,.5);display:flex;flex-direction:column;
  max-height:92vh;
}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;background:#1e293b;color:#fff}
.modal-head h3{font-size:1rem;font-family:'Inter';font-weight:700}
.modal-head-actions{display:flex;gap:8px}
.icon-btn{width:34px;height:34px;border-radius:8px;background:rgba(255,255,255,.1);color:#fff;display:flex;align-items:center;justify-content:center;transition:.15s}
.icon-btn:hover{background:rgba(255,255,255,.22)}

/* ---------- Testimonials ---------- */
.testi-card{padding:28px;display:flex;flex-direction:column;gap:16px}
.testi-stars{color:var(--yellow);font-size:1.1rem;letter-spacing:2px}
.testi-quote{color:var(--text-muted);font-size:.95rem}
.testi-person{display:flex;align-items:center;gap:12px;margin-top:4px}
.avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--coral),var(--yellow));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700}
.testi-person strong{display:block;font-size:.9rem}
.testi-person span{font-size:.78rem;color:var(--text-muted)}

/* ---------- Forms ---------- */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.form-grid .full{grid-column:1/-1}
.field label{display:block;font-size:.85rem;font-weight:600;margin-bottom:6px}
.field input,.field textarea,.field select{
  width:100%;padding:13px 16px;border-radius:var(--radius-sm);border:1.5px solid var(--border);
  font:inherit;background:#fff;transition:border-color .15s ease;
}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--primary)}
.field textarea{resize:vertical;min-height:120px}
@media(max-width:640px){.form-grid{grid-template-columns:1fr}}

/* ---------- Footer ---------- */
.site-footer{background:#0f172a;color:#CBD5E1;padding:64px 0 24px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px;margin-bottom:40px}
.footer-brand p{color:#94A3B8;font-size:.9rem;margin:14px 0 18px;max-width:280px}
.footer-brand .brand{color:#fff}
.social-row{display:flex;gap:10px}
.social-row a{width:38px;height:38px;border-radius:10px;background:rgba(255,255,255,.08);display:flex;align-items:center;justify-content:center;transition:.15s}
.social-row a:hover{background:var(--primary)}
.footer-col h4{color:#fff;font-size:.95rem;margin-bottom:16px}
.footer-col ul li{margin-bottom:10px}
.footer-col a{color:#94A3B8;font-size:.88rem;transition:color .15s}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:.82rem;color:#64748B}
@media(max-width:900px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.footer-grid{grid-template-columns:1fr}}

/* ---------- Misc ---------- */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
@media(max-width:900px){.two-col{grid-template-columns:1fr}}
.badge-list{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.badge-list span{background:#fff;border:1px solid var(--border);padding:8px 14px;border-radius:999px;font-size:.82rem;display:flex;align-items:center;gap:6px}

.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:translateY(0)}

/* ================================================================
   App shell — sidebar + topbar layout (used by all pages)
   ================================================================ */
:root{
  --sidebar-w:264px;
  --sidebar-w-collapsed:80px;
  --topbar-h:64px;
}

.app-shell{display:flex;min-height:100vh;background:var(--bg)}

/* ---------- Sidebar ---------- */
.sidebar{
  width:var(--sidebar-w);flex-shrink:0;background:var(--surface);
  border-right:1px solid var(--border);display:flex;flex-direction:column;
  position:fixed;top:0;left:0;bottom:0;z-index:200;
  transition:width .22s ease,transform .28s ease;
}
.sidebar-brand{
  display:flex;align-items:center;gap:10px;padding:18px 20px;height:var(--topbar-h);
  border-bottom:1px solid var(--border);flex-shrink:0;white-space:nowrap;overflow:hidden;
}
.sidebar-brand .brand{font-size:1.2rem}
.sidebar-scroll{flex:1;overflow-y:auto;padding:16px 12px 24px}
.sidebar-group-label{
  font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;
  color:var(--text-muted);padding:14px 12px 8px;white-space:nowrap;overflow:hidden;
}
.sidebar-group-label:first-child{padding-top:4px}
.sidebar-link{
  display:flex;align-items:center;gap:14px;padding:11px 12px;border-radius:var(--radius-sm);
  font-weight:600;font-size:.92rem;color:var(--text);margin-bottom:2px;white-space:nowrap;overflow:hidden;
  transition:background .15s ease,color .15s ease;position:relative;
}
.sidebar-link:hover{background:var(--bg)}
.sidebar-link.active{background:rgba(79,70,229,.09);color:var(--primary-dark)}
.sidebar-link.active .sidebar-icon{filter:none}
.sidebar-icon{width:26px;height:26px;flex-shrink:0;display:flex;align-items:center;justify-content:center}
.sidebar-icon svg{width:100%;height:100%}
.sidebar-link-label{overflow:hidden;text-overflow:ellipsis}
.sidebar-divider{height:1px;background:var(--border);margin:12px 8px}
.sidebar-foot{padding:14px 20px;border-top:1px solid var(--border);flex-shrink:0}

/* Desktop manual collapse (icon-only) */
.sidebar.collapsed{width:var(--sidebar-w-collapsed)}
.sidebar.collapsed .sidebar-link-label,
.sidebar.collapsed .sidebar-group-label,
.sidebar.collapsed .sidebar-brand span.brand-text,
.sidebar.collapsed .sidebar-foot{display:none}
.sidebar.collapsed .sidebar-link{justify-content:center}
.sidebar.collapsed .sidebar-brand{justify-content:center;padding:18px 8px}

/* ---------- Topbar ---------- */
.topbar{
  height:var(--topbar-h);display:flex;align-items:center;justify-content:space-between;
  padding:0 24px;background:rgba(248,250,252,.9);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);position:sticky;top:0;z-index:90;
}
.topbar-left{display:flex;align-items:center;gap:14px}
.topbar-title{font-family:'Baloo 2';font-weight:700;font-size:1.05rem}
.sidebar-toggle-btn,.mobile-menu-btn{
  width:38px;height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  color:var(--text-muted);background:transparent;transition:background .15s ease;flex-shrink:0;
}
.sidebar-toggle-btn:hover,.mobile-menu-btn:hover{background:var(--bg)}
.mobile-menu-btn{display:none}
.sidebar-overlay{
  display:none;position:fixed;inset:0;background:rgba(15,23,42,.5);z-index:190;
}
.sidebar-overlay.open{display:block}

/* ---------- Main content ---------- */
.main-content{flex:1;min-width:0;margin-left:var(--sidebar-w);transition:margin-left .22s ease}
.main-content.shifted{margin-left:var(--sidebar-w-collapsed)}
.content-pad{padding:32px}

@media(max-width:1024px){
  .sidebar{width:var(--sidebar-w-collapsed)}
  .sidebar .sidebar-link-label,.sidebar .sidebar-group-label,.sidebar .brand-text,.sidebar .sidebar-foot{display:none}
  .sidebar .sidebar-link{justify-content:center}
  .sidebar .sidebar-brand{justify-content:center;padding:18px 8px}
  .sidebar.expanded{width:var(--sidebar-w)}
  .sidebar.expanded .sidebar-link-label,.sidebar.expanded .sidebar-group-label,.sidebar.expanded .brand-text,.sidebar.expanded .sidebar-foot{display:block}
  .sidebar.expanded .sidebar-link{justify-content:flex-start}
  .sidebar.expanded .sidebar-brand{justify-content:flex-start;padding:18px 20px}
  .main-content{margin-left:var(--sidebar-w-collapsed)}
  .sidebar-toggle-btn{display:none}
  .mobile-menu-btn{display:flex}
}

@media(max-width:720px){
  .sidebar{transform:translateX(-100%);width:var(--sidebar-w);box-shadow:0 0 40px rgba(0,0,0,.2)}
  .sidebar .sidebar-link-label,.sidebar .sidebar-group-label,.sidebar .brand-text,.sidebar .sidebar-foot{display:block}
  .sidebar .sidebar-link{justify-content:flex-start}
  .sidebar .sidebar-brand{justify-content:flex-start;padding:18px 20px}
  .sidebar.mobile-open{transform:translateX(0)}
  .main-content{margin-left:0}
  .content-pad{padding:20px 16px}
}

/* ---------- Page header (inside content, replaces old page-banner on inner pages) ---------- */
.page-head{margin-bottom:28px}
.page-head h1{font-size:1.7rem;margin-bottom:8px}
.page-head p{color:var(--text-muted)}

/* ---------- Colorful sidebar icon tints (reference-style flat icons) ---------- */
.tint-blue{color:#2563EB}
.tint-dark{color:#374151}
.tint-amber{color:#D97706}
.tint-red{color:#DC2626}
.tint-cyan{color:#0891B2}
.tint-purple{color:#7C3AED}
.tint-orange{color:#EA580C}
.tint-green{color:#16A34A}

/* ================================================================
   Block-coding IDE layout (device-programming.html / ai-programming.html)
   ================================================================ */
.ide-layout{display:grid;grid-template-columns:1fr 360px;gap:20px;align-items:start}
@media(max-width:960px){.ide-layout{grid-template-columns:1fr}}

.blockly-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-sm)}
.blockly-toolbar{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--border);gap:10px;flex-wrap:wrap}
.blockly-toolbar-actions{display:flex;gap:8px}
.blockly-div{width:100%;height:520px}
@media(max-width:640px){.blockly-div{height:400px}}

.device-panel{display:flex;flex-direction:column;gap:16px;position:sticky;top:calc(var(--topbar-h) + 16px)}
.device-stage-card{background:#0f172a;border-radius:var(--radius-md);padding:18px;color:#fff;box-shadow:var(--shadow-sm)}
.device-stage-title{font-size:.82rem;color:#94A3B8;margin-bottom:12px;display:flex;justify-content:space-between}
.device-stage{
  position:relative;width:100%;aspect-ratio:1/1;background:
    linear-gradient(#1e293b 1px,transparent 1px),linear-gradient(90deg,#1e293b 1px,transparent 1px),#0b1220;
  background-size:26px 26px;border-radius:14px;overflow:hidden;border:1px solid #1e293b;
}
.device-car{
  position:absolute;width:34px;height:34px;left:50%;top:50%;
  transform:translate(-50%,-50%) rotate(0deg);
  transition:transform .5s cubic-bezier(.4,0,.2,1),left .5s cubic-bezier(.4,0,.2,1),top .5s cubic-bezier(.4,0,.2,1);
}
.device-car svg{width:100%;height:100%}
.led-row{display:flex;gap:10px;justify-content:center;margin-top:16px}
.led-dot{
  width:26px;height:26px;border-radius:50%;background:#1e293b;border:2px solid #334155;
  transition:background .2s ease,box-shadow .2s ease;
}
.led-dot.on{background:#FBBF24;box-shadow:0 0 14px 4px rgba(251,191,36,.7);border-color:#FBBF24}
.device-controls{display:flex;gap:8px}
.device-log-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:16px;flex:1;display:flex;flex-direction:column}
.device-log-card h4{font-size:.85rem;margin-bottom:10px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.03em}
.device-log{list-style:none;font-size:.85rem;display:flex;flex-direction:column;gap:6px;max-height:220px;overflow-y:auto}
.device-log li{padding:7px 10px;background:var(--bg);border-radius:8px;border-left:3px solid var(--primary)}
.device-log li.empty{color:var(--text-muted);border-left-color:var(--border);font-style:italic}

/* AI programming — confidence gauge + assistant panel */
.ai-avatar{
  width:88px;height:88px;border-radius:50%;margin:0 auto 14px;
  background:linear-gradient(135deg,#7C3AED,#C084FC);display:flex;align-items:center;justify-content:center;
  font-size:2.2rem;
}
.ai-speech{
  background:#1e293b;border-radius:12px;padding:12px 14px;font-size:.88rem;color:#E2E8F0;min-height:44px;
  display:flex;align-items:center;justify-content:center;text-align:center;
}
.confidence-wrap{margin-top:16px}
.confidence-label{display:flex;justify-content:space-between;font-size:.78rem;color:#94A3B8;margin-bottom:6px}
.confidence-bar{height:10px;border-radius:999px;background:#1e293b;overflow:hidden}
.confidence-fill{height:100%;background:linear-gradient(90deg,#7C3AED,#C084FC);width:0%;transition:width .4s ease}

/* ================================================================
   Virtual devices gallery
   ================================================================ */
.vd-card{padding:0}
.vd-stage{background:#0f172a;border-radius:var(--radius-md) var(--radius-md) 0 0;padding:22px;color:#fff}
.vd-stage-title{font-size:.8rem;color:#94A3B8;margin-bottom:14px;display:flex;justify-content:space-between}
.vd-body{padding:22px}
.vd-body h3{font-size:1.1rem;margin-bottom:8px}
.vd-body p{color:var(--text-muted);font-size:.9rem;margin-bottom:16px}
.vd-controls{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}

.dpad{display:grid;grid-template-columns:repeat(3,40px);grid-template-rows:repeat(2,40px);gap:6px;justify-content:center;margin-top:14px}
.dpad button{background:rgba(255,255,255,.08);color:#fff;border-radius:8px;font-size:1rem;transition:background .15s}
.dpad button:hover{background:rgba(255,255,255,.2)}
.dpad .dpad-up{grid-column:2;grid-row:1}
.dpad .dpad-left{grid-column:1;grid-row:2}
.dpad .dpad-stop{grid-column:2;grid-row:2}
.dpad .dpad-right{grid-column:3;grid-row:2}

.led-matrix{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;max-width:200px;margin:0 auto}
.led-matrix .led-dot{width:100%;aspect-ratio:1/1;cursor:pointer}

.traffic-housing{width:70px;margin:0 auto;background:#1e293b;border-radius:12px;padding:12px;display:flex;flex-direction:column;gap:10px}
.traffic-light{width:44px;height:44px;border-radius:50%;background:#334155;margin:0 auto;transition:background .3s ease,box-shadow .3s ease}
.traffic-light.on-red{background:#EF4444;box-shadow:0 0 16px 4px rgba(239,68,68,.7)}
.traffic-light.on-yellow{background:#FBBF24;box-shadow:0 0 16px 4px rgba(251,191,36,.7)}
.traffic-light.on-green{background:#22C55E;box-shadow:0 0 16px 4px rgba(34,197,94,.7)}

.servo-stage{display:flex;flex-direction:column;align-items:center;gap:14px}
.servo-arm-wrap{width:140px;height:90px;position:relative}
.servo-base{position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:56px;height:20px;background:#334155;border-radius:6px 6px 0 0}
.servo-arm{position:absolute;bottom:16px;left:50%;width:8px;height:80px;background:#22D3EE;border-radius:4px;transform-origin:bottom center;transform:translateX(-50%) rotate(0deg);transition:transform .25s ease}
.servo-readout{font-size:.85rem;color:#94A3B8}
input[type="range"]{width:100%;accent-color:var(--primary)}

/* ================================================================
   IoT dashboard
   ================================================================ */
.status-pill{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:999px;background:rgba(34,197,94,.12);color:#16A34A;font-weight:700;font-size:.8rem}
.status-pill .dot{width:8px;height:8px;border-radius:50%;background:#22C55E;box-shadow:0 0 0 3px rgba(34,197,94,.25)}

.iot-stat-card{padding:22px;display:flex;flex-direction:column;gap:6px}
.iot-stat-top{display:flex;align-items:center;justify-content:space-between}
.iot-stat-icon{font-size:1.4rem}
.iot-stat-trend{font-size:.78rem;font-weight:700;padding:3px 8px;border-radius:999px}
.trend-up{background:rgba(220,38,38,.1);color:#DC2626}
.trend-down{background:rgba(37,99,235,.1);color:#2563EB}
.trend-stable{background:rgba(100,116,139,.1);color:#64748B}
.iot-stat-value{font-family:'Baloo 2';font-size:1.9rem;color:var(--text)}
.iot-stat-label{color:var(--text-muted);font-size:.85rem}

.iot-chart-card{background:#0f172a;border-radius:var(--radius-md);padding:22px;color:#fff}
.iot-chart-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;flex-wrap:wrap;gap:10px}
.iot-chart-head h3{font-size:1rem}
.iot-legend{display:flex;gap:14px;font-size:.78rem;color:#94A3B8}
.iot-legend span{display:inline-flex;align-items:center;gap:5px}
.iot-legend i{width:10px;height:10px;border-radius:50%;display:inline-block}

.device-toggle-row{display:flex;align-items:center;justify-content:space-between;padding:14px 4px;border-bottom:1px solid var(--border)}
.device-toggle-row:last-child{border-bottom:none}
.device-toggle-info{display:flex;align-items:center;gap:12px}
.device-toggle-icon{width:40px;height:40px;border-radius:12px;background:var(--bg);display:flex;align-items:center;justify-content:center;font-size:1.1rem}
.switch{position:relative;display:inline-block;width:44px;height:24px;flex-shrink:0}
.switch input{opacity:0;width:0;height:0}
.switch-slider{position:absolute;inset:0;background:#CBD5E1;border-radius:999px;cursor:pointer;transition:background .2s ease}
.switch-slider::before{content:"";position:absolute;width:18px;height:18px;left:3px;top:3px;background:#fff;border-radius:50%;transition:transform .2s ease}
.switch input:checked + .switch-slider{background:var(--primary)}
.switch input:checked + .switch-slider::before{transform:translateX(20px)}
@media(max-width:900px){#iotMainGrid{grid-template-columns:1fr !important}}

/* ================================================================
   Virtual devices dashboard (Project Builder / Map Builder / Mạch điện)
   ================================================================ */
.vg-topbar-actions{display:flex;gap:10px}
.vg-section{margin-bottom:44px}
.vg-section-head{display:flex;align-items:baseline;gap:12px;margin-bottom:16px;justify-content:space-between;flex-wrap:wrap}
.vg-section-head .vg-title{display:flex;align-items:baseline;gap:10px}
.vg-section-head h2{font-size:1.15rem}
.vg-section-head .vg-link{color:var(--primary);font-weight:700;font-size:.85rem}
.vg-row{display:flex;gap:16px;flex-wrap:wrap}
.vg-create-card{
  width:152px;height:152px;border-radius:18px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;
  color:#fff;font-weight:700;font-size:.88rem;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease;flex-shrink:0;
  box-shadow:var(--shadow-sm);border:none;text-align:center;padding:10px;
}
.vg-create-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.vg-create-icon{width:44px;height:44px;border-radius:50%;background:rgba(255,255,255,.25);display:flex;align-items:center;justify-content:center;font-size:1.4rem}
.vg-item-card{
  width:152px;border-radius:18px;background:var(--surface);border:1px solid var(--border);overflow:hidden;cursor:pointer;
  transition:transform .15s ease,box-shadow .15s ease;flex-shrink:0;text-align:left;
}
.vg-item-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.vg-item-thumb{height:96px;background:var(--bg);display:flex;align-items:center;justify-content:center;font-size:2.2rem}
.vg-item-info{padding:10px 12px}
.vg-item-info strong{display:block;font-size:.85rem;margin-bottom:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.vg-item-info span{font-size:.72rem;color:var(--text-muted)}
.vg-empty-note{color:var(--text-muted);font-size:.9rem;display:flex;align-items:center;padding:0 4px}
.vg-empty-note strong{color:var(--text);font-weight:700}

/* ================================================================
   Builder editors (circuit-builder / project-builder / map-builder)
   ================================================================ */
.builder-topbar{
  min-height:var(--topbar-h);display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:8px 18px;background:rgba(248,250,252,.95);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:90;flex-wrap:wrap;
}
.builder-topbar-left{display:flex;align-items:center;gap:12px}
.builder-back{width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;color:var(--text-muted);transition:background .15s}
.builder-back:hover{background:var(--bg)}
.builder-name-input{
  border:1.5px solid transparent;background:transparent;font-family:'Baloo 2';font-weight:700;font-size:1.05rem;
  padding:6px 10px;border-radius:8px;min-width:140px;
}
.builder-name-input:hover,.builder-name-input:focus{border-color:var(--border);background:#fff;outline:none}
.builder-tabs{display:flex;gap:4px;background:var(--bg);padding:4px;border-radius:10px}
.builder-tab{padding:8px 16px;border-radius:8px;font-weight:700;font-size:.85rem;color:var(--text-muted)}
.builder-tab.active{background:var(--primary);color:#fff}
.builder-topbar-right{display:flex;align-items:center;gap:8px}

.builder-body{display:flex;height:calc(100vh - var(--topbar-h))}
.builder-canvas-wrap{flex:1;position:relative;overflow:auto;background:
  linear-gradient(#E2E8F0 1px,transparent 1px),linear-gradient(90deg,#E2E8F0 1px,transparent 1px);
  background-size:24px 24px;background-color:#F8FAFC;
}
.builder-canvas-wrap svg{cursor:default}
.builder-side{width:280px;flex-shrink:0;background:var(--surface);border-left:1px solid var(--border);overflow-y:auto;padding:18px;transition:width .15s ease}
.builder-side.wide{width:420px}
.builder-side h4{font-size:.8rem;text-transform:uppercase;letter-spacing:.03em;color:var(--text-muted);margin-bottom:12px}
.palette-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.palette-item{
  background:var(--bg);border:1.5px solid var(--border);border-radius:12px;padding:14px 8px;text-align:center;
  cursor:pointer;transition:border-color .15s ease,transform .15s ease;
}
.palette-item:hover{border-color:var(--primary);transform:translateY(-2px)}
.palette-item .pi-icon{font-size:1.6rem;margin-bottom:6px}
.palette-item .pi-label{font-size:.76rem;font-weight:600;color:var(--text)}

.builder-hint{
  position:absolute;bottom:16px;left:50%;transform:translateX(-50%);background:#1e293b;color:#fff;
  padding:9px 18px;border-radius:999px;font-size:.82rem;box-shadow:var(--shadow-md);pointer-events:none;opacity:0;transition:opacity .2s ease;
}
.builder-hint.show{opacity:1}

.comp-body{cursor:grab}
.comp-body.selected rect{stroke:var(--primary);stroke-width:2.5}
.comp-terminal{cursor:crosshair;fill:#94A3B8;stroke:#fff;stroke-width:1.5}
.comp-terminal:hover{fill:var(--primary)}
.wire-line{stroke:#334155;stroke-width:3;fill:none}
.wire-line.powered{stroke:#22C55E}
.comp-delete-btn{cursor:pointer}

.mini-toolbar{position:absolute;top:14px;left:14px;display:flex;gap:8px;background:#fff;padding:8px;border-radius:12px;box-shadow:var(--shadow-sm);z-index:5}

.builder-topbar-right .btn:disabled{opacity:.35;cursor:not-allowed}
.builder-topbar-right .btn-icon{width:36px;height:36px;padding:0;border-radius:9px;background:transparent;color:var(--text-muted);display:inline-flex;align-items:center;justify-content:center;font-size:1rem;flex-shrink:0}
.builder-topbar-right .btn-icon:hover:not(:disabled){background:var(--bg)}
.cb-save-btn-dirty{position:relative}
.cb-save-btn-dirty::after{content:"";position:absolute;top:2px;right:2px;width:8px;height:8px;border-radius:50%;background:#EF4444;border:1.5px solid #fff}
.wire-color-input{width:34px;height:34px;border:1.5px solid var(--border);border-radius:9px;padding:2px;cursor:pointer;background:#fff}
.toolbar-divider{width:1px;height:26px;background:var(--border);margin:0 4px}

/* ---------- Circuit builder: category dropdown + component detail panel ---------- */
.cat-dropdown{position:relative;margin-bottom:16px}
.cat-trigger{
  width:100%;display:flex;align-items:center;justify-content:space-between;padding:11px 14px;
  border:1.5px solid var(--border);border-radius:10px;background:#fff;font-weight:700;font-size:.86rem;color:var(--text);
}
.cat-trigger:hover{border-color:var(--primary)}
.cat-menu{
  position:absolute;top:calc(100% + 6px);left:0;right:0;background:#fff;border:1px solid var(--border);
  border-radius:10px;box-shadow:var(--shadow-md);z-index:20;overflow:hidden;display:none;
}
.cat-menu.open{display:block}
.cat-menu-item{padding:11px 14px;font-size:.84rem;font-weight:600;cursor:pointer;color:var(--text)}
.cat-menu-item:hover{background:var(--bg)}
.cat-menu-item.active{background:rgba(79,70,229,.08);color:var(--primary)}

.palette-item.armed{border-color:var(--primary);background:rgba(79,70,229,.06);box-shadow:0 0 0 2px rgba(79,70,229,.15)}

.detail-back{font-size:.82rem;color:var(--primary);font-weight:700;display:inline-block;margin-bottom:16px}
.detail-head{display:flex;justify-content:space-between;align-items:center}
.detail-head h3{font-size:1.1rem}
.detail-delete{width:30px;height:30px;border-radius:8px;background:#FEE2E2;color:#DC2626;font-weight:700;flex-shrink:0}
.detail-delete:hover{background:#FECACA}

/* ---------- IoT dashboard gallery (search + create/import + card list w/ popover) ---------- */
.gallery-toolbar{display:flex;gap:12px;justify-content:space-between;align-items:center;flex-wrap:wrap;margin-bottom:24px}
.gallery-search{position:relative;flex:1;min-width:220px;max-width:360px}
.gallery-search input{width:100%;padding:11px 16px 11px 40px;border-radius:999px;border:1.5px solid var(--border);font:inherit}
.gallery-search input:focus{outline:none;border-color:var(--primary)}
.gallery-search svg{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--text-muted)}
.gallery-actions{display:flex;gap:8px}
.gallery-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:18px}
.gallery-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);transition:transform .15s ease,box-shadow .15s ease}
.gallery-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.gallery-card-thumb{aspect-ratio:16/10;background:linear-gradient(135deg,#0891B2,#22D3EE);display:flex;align-items:center;justify-content:center;font-size:2.4rem;cursor:pointer;border-radius:var(--radius-md) var(--radius-md) 0 0;overflow:hidden}
.gallery-card-body{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;gap:8px}
.gallery-card-name{font-weight:700;font-size:.9rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;cursor:pointer}
.gallery-card-menu-wrap{position:relative;flex-shrink:0}
.gallery-card-menu-btn{width:30px;height:30px;border-radius:8px;color:var(--text-muted)}
.gallery-card-menu-btn:hover{background:var(--bg)}
.gallery-card-menu{position:absolute;top:calc(100% + 4px);right:0;background:#fff;border:1px solid var(--border);border-radius:10px;box-shadow:var(--shadow-md);z-index:20;overflow:hidden;display:none;min-width:150px}
.gallery-card-menu.open{display:block}
.gallery-card-menu-item{padding:10px 14px;font-size:.85rem;font-weight:600;cursor:pointer;display:flex;align-items:center;gap:8px}
.gallery-card-menu-item:hover{background:var(--bg)}
.gallery-card-menu-item.danger{color:#DC2626}

/* ---------- Project/Map builder: categories, scene list, selection panel ---------- */
.pb-subcat-row{display:none;gap:6px;flex-wrap:wrap;padding:8px 4px;border-bottom:1px solid var(--border);margin-bottom:10px}
.pb-subcat-btn{width:34px;height:34px;border-radius:9px;background:var(--bg);font-size:1rem;flex-shrink:0}
.pb-subcat-btn.active{background:var(--primary);color:#fff}

.pb-selection-panel{background:var(--bg);border-radius:12px;padding:14px;margin-top:14px}
.pb-selection-panel h4{font-size:.9rem}

.pb-scene-panel{margin-top:18px;border-top:1px solid var(--border);padding-top:14px}
.pb-scene-panel h4{font-size:.8rem;text-transform:uppercase;letter-spacing:.03em;color:var(--text-muted);margin-bottom:10px}
.pb-scene-list{list-style:none;display:flex;flex-direction:column;gap:4px;max-height:180px;overflow-y:auto}
.pb-scene-list .empty{color:var(--text-muted);font-size:.82rem;font-style:italic;padding:6px 4px}
.scene-item{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:9px;font-size:.82rem;cursor:pointer}
.scene-item:hover{background:var(--bg)}
.scene-item.selected{background:rgba(79,70,229,.09);color:var(--primary-dark)}
.scene-item .item-label{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.scene-item .item-delete{color:#DC2626;font-weight:700;padding:2px 4px;border-radius:6px}
.scene-item .item-delete:hover{background:#FEE2E2}