:root{
  --bg-1:#070914;
  --bg-2:#10142a;
  --accent-1:#5ad1ff;
  --accent-2:#8b6cff;
  --accent-3:#ff7b54;
  --accent-4:#ffcf5c;
  --accent-5:#39ff8f;
  --danger:#ff5470;
  --text-1:#eef3ff;
  --text-2:#9aa5c9;
  --glass-bg:rgba(255,255,255,0.045);
  --glass-border:rgba(255,255,255,0.09);
  --font-scale:1;
}
[data-theme="light"]{
  --bg-1:#eef2ff; --bg-2:#ffffff; --text-1:#0c1226; --text-2:#495079;
  --glass-bg:rgba(10,15,40,0.04); --glass-border:rgba(10,15,40,0.10);
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;font-family:system-ui,-apple-system,"Segoe UI",sans-serif;
  background:linear-gradient(160deg,var(--bg-1),var(--bg-2));color:var(--text-1);
  font-size:calc(15px*var(--font-scale));}
#bg-canvas{position:fixed;inset:0;z-index:-1;}
.glass{background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:20px;
  backdrop-filter:blur(10px);}
h1{background:linear-gradient(90deg,var(--accent-1),var(--accent-2),var(--accent-3));
  -webkit-background-clip:text;background-clip:text;color:transparent;font-weight:800;}
.screen-sub{color:var(--text-2);margin-top:-6px;}
.icon-btn{width:38px;height:38px;border-radius:50%;border:1px solid var(--glass-border);
  background:var(--glass-bg);color:var(--text-1);cursor:pointer;font-size:1rem;transition:.2s;}
.icon-btn:hover{transform:scale(1.1);border-color:var(--accent-1);}
.sound-btn{position:relative;border-color:var(--accent-5);box-shadow:0 0 12px rgba(57,255,143,.22);}
.sound-btn::after{content:"ON";position:absolute;right:-5px;bottom:-4px;padding:1px 3px;border-radius:4px;background:var(--accent-5);color:#061019;font-size:6px;font-weight:900;}
.sound-btn.muted{border-color:var(--danger);box-shadow:none;}
.sound-btn.muted::after{content:"OFF";background:var(--danger);}
.xp-pill{display:flex;flex-direction:column;align-items:center;padding:6px 16px;border-radius:20px;
  background:linear-gradient(135deg,rgba(90,209,255,0.18),rgba(139,108,255,0.18));
  border:1px solid var(--accent-1);font-weight:700;font-size:.75rem;line-height:1.3;}
#rank-value{color:var(--accent-1);font-size:.68rem;text-transform:uppercase;letter-spacing:.06em;}

.btn{background:var(--glass-bg);border:1px solid var(--glass-border);color:var(--text-1);
  padding:9px 15px;border-radius:11px;cursor:pointer;font-weight:700;font-size:.82rem;transition:.18s;}
.btn:hover{border-color:var(--accent-1);transform:translateY(-1px);}
.btn-primary{background:linear-gradient(135deg,var(--accent-3),var(--accent-4));color:#1c0d02;border:none;
  box-shadow:0 0 16px rgba(255,123,84,.4);}
.btn-primary:hover{box-shadow:0 0 24px rgba(255,123,84,.6);}

.home-hero{text-align:center;margin:20px auto 30px;max-width:720px;}
.home-hero h1{font-size:2.1rem;margin-bottom:8px;}
.home-hero p{color:var(--text-2);}
.home-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:18px;}
.home-card{display:flex;flex-direction:column;align-items:center;gap:8px;padding:24px 12px;cursor:pointer;
  border-radius:18px;background:var(--glass-bg);border:1px solid var(--glass-border);transition:.2s;text-align:center;}
.home-card:hover{transform:translateY(-4px);border-color:var(--accent-1);box-shadow:0 10px 26px rgba(90,209,255,.18);}
.home-icon{font-size:2.1rem;}
.home-card strong{font-size:.92rem;}
.home-card small{color:var(--text-2);font-size:.74rem;}
.daily-wrap{margin-top:26px;}
.daily-card{padding:16px 18px;border-radius:16px;background:var(--glass-bg);border:1px solid var(--glass-border);}
.daily-card h3{margin:0 0 5px;color:var(--accent-4);font-size:.85rem;}

/* ===== Anatomy screen ===== */
.anatomy-panel{padding:22px;margin-top:10px;}
.anatomy-toolbar{display:flex;align-items:center;gap:10px;margin-bottom:18px;flex-wrap:wrap;}
.anatomy-hint{color:var(--text-2);font-size:.82rem;margin-left:auto;}

.anatomy-minimum{display:grid;grid-template-columns:42px 1fr;gap:12px;align-items:start;margin:0 0 20px;padding:14px 16px;
  border:1px solid rgba(255,207,92,.4);border-radius:14px;background:linear-gradient(100deg,rgba(255,207,92,.10),rgba(90,209,255,.05));}
.minimum-icon{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:rgba(255,207,92,.16);font-size:1.3rem;}
.minimum-eyebrow{margin:0 0 3px;color:var(--accent-4);font-size:.66rem;font-weight:900;letter-spacing:.08em;}
.anatomy-minimum h3{margin:0 0 6px;font-size:1rem;color:var(--text-1);background:none;-webkit-background-clip:unset;
  background-clip:unset;}
.anatomy-minimum p{margin:0;color:var(--text-2);font-size:.85rem;line-height:1.5;}

.anatomy-stage{display:grid;grid-template-columns:320px 1fr;gap:28px;align-items:start;}
.anatomy-stage.orbital-stage{grid-template-columns:440px 1fr;}
@media (max-width:900px){.anatomy-stage,.anatomy-stage.orbital-stage{grid-template-columns:1fr;}}

.anatomy-silhouette{position:relative;width:280px;height:540px;margin:0 auto;
  background:transparent;border:none;border-radius:20px;box-shadow:0 12px 30px rgba(0,0,0,.35);}
.anatomy-silhouette.orbital{width:420px;height:480px;border-radius:16px;margin:0 auto;}
.anatomy-illustration{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;
  border-radius:inherit;pointer-events:none;user-select:none;}

.anatomy-hotspot{position:absolute;transform:translate(-50%,-50%);width:22px;height:22px;border-radius:50%;
  border:none;background:transparent;cursor:pointer;z-index:2;}
.hotspot-pulse{display:block;width:16px;height:16px;border-radius:50%;background:var(--accent-1);
  box-shadow:0 0 0 0 rgba(90,209,255,.7);animation:hotspotPulse 1.8s infinite;}
.anatomy-hotspot.active .hotspot-pulse{background:var(--accent-3);}
@keyframes hotspotPulse{0%{box-shadow:0 0 0 0 rgba(90,209,255,.55);}70%{box-shadow:0 0 0 14px rgba(90,209,255,0);}100%{box-shadow:0 0 0 0 rgba(90,209,255,0);}}
.hotspot-label{position:absolute;left:16px;top:-4px;min-width:max-content;padding:3px 6px;border-radius:6px;
  background:#07111ed9;border:1px solid var(--accent-1);color:#e9fbff;font:700 10px/1 system-ui;
  opacity:0;pointer-events:none;transform:translateY(3px);transition:.16s;white-space:nowrap;}
.anatomy-hotspot:hover .hotspot-label,.anatomy-hotspot.active .hotspot-label{opacity:1;transform:translateY(0);}
.anatomy-silhouette.orbital .hotspot-label{font-size:9px;}
@media(max-width:520px){.anatomy-silhouette.orbital{width:100%;height:auto;aspect-ratio:420/480;}}

.anatomy-detail{background:rgba(255,255,255,0.03);border:1px solid var(--glass-border);border-radius:16px;
  padding:20px;min-height:240px;position:relative;z-index:4;overflow-wrap:anywhere;}
.anatomy-detail h3{margin-top:0;color:var(--accent-1);}
.anatomy-detail .badge{margin-top:10px;display:inline-block;}
.placeholder-text{color:var(--text-2);}

.anatomy-legend{margin-top:28px;}
.anatomy-legend h3{margin-bottom:10px;font-size:1rem;background:none;color:var(--text-1);
  -webkit-background-clip:unset;background-clip:unset;}
.anatomy-legend-grid{display:flex;flex-wrap:wrap;gap:9px;}
.legend-chip{background:rgba(255,255,255,0.05);border:1px solid var(--glass-border);color:var(--text-1);
  padding:7px 12px;border-radius:20px;cursor:pointer;font-size:.78rem;transition:.16s;}
.legend-chip:hover{border-color:var(--accent-1);}

/* ===== Guided build levels ===== */
.build-levels{margin:0 0 14px;padding:11px;border:1px solid var(--glass-border);border-radius:14px;
  background:rgba(0,0,0,.16);display:grid;gap:7px;}
.level-heading{margin:0 0 2px;color:var(--accent-4);font-size:.69rem;font-weight:800;
  text-transform:uppercase;letter-spacing:.08em;}
.build-level{display:flex;align-items:center;gap:9px;width:100%;padding:8px;border:1px solid transparent;
  border-radius:10px;background:transparent;color:var(--text-2);cursor:pointer;text-align:left;transition:.18s;}
.build-level:hover{background:rgba(255,255,255,.05);color:var(--text-1);}
.build-level.active{background:linear-gradient(135deg,rgba(90,209,255,.15),rgba(139,108,255,.17));
  border-color:var(--accent-1);color:var(--text-1);}
.level-number{display:grid;place-items:center;flex:0 0 30px;width:30px;height:30px;border-radius:9px;
  background:rgba(255,255,255,.09);color:var(--accent-4);font-size:.72rem;font-weight:900;}
.build-level.active .level-number{background:linear-gradient(135deg,var(--accent-1),var(--accent-2));color:#06101c;}
.build-level strong{display:block;font-size:.78rem;}
.build-level small{display:block;margin-top:2px;font-size:.66rem;color:var(--text-2);}
.level-progress{padding:8px 5px 1px;color:var(--accent-5);font-size:.7rem;font-weight:700;line-height:1.35;}

/* ===== Build workspace ===== */
.build-layout{display:grid;grid-template-columns:270px 1fr 280px;gap:16px;}
@media(max-width:1100px){.build-layout{grid-template-columns:1fr;}}
.palette-panel,.diagnostics-panel{padding:16px;max-height:82vh;overflow-y:auto;}
.palette-panel h2,.diagnostics-panel h2{margin-top:0;font-size:1rem;background:none;color:var(--text-1);
  -webkit-background-clip:unset;background-clip:unset;}
.palette-tabs{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px;}
.palette-tab{padding:6px 10px;border-radius:9px;border:1px solid var(--glass-border);background:rgba(255,255,255,.04);
  color:var(--text-2);cursor:pointer;font-size:.72rem;font-weight:700;}
.palette-tab.active{background:linear-gradient(135deg,var(--accent-1),var(--accent-2));color:#06101c;border-color:transparent;}
.palette-list{display:grid;gap:8px;}
.palette-item{padding:10px;border-radius:12px;border:1px solid var(--glass-border);background:rgba(255,255,255,.03);
  cursor:grab;display:grid;gap:2px;}
.palette-item:hover{border-color:var(--accent-1);}
.palette-type{font-size:.62rem;color:var(--accent-4);font-weight:800;letter-spacing:.05em;}
.palette-item strong{font-size:.84rem;}
.palette-item small{color:var(--text-2);font-size:.7rem;}

.workspace-toolbar{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;margin-bottom:12px;
  flex-wrap:wrap;gap:8px;}
#device-title{font-weight:800;font-size:.95rem;color:var(--accent-1);}
.toolbar-actions{display:flex;gap:8px;flex-wrap:wrap;}
.board-area{position:relative;padding:16px;min-height:520px;}
#wire-layer{position:absolute;inset:0;pointer-events:none;width:100%;height:100%;}
#slot-container{position:relative;z-index:1;display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px;}
.slot{position:relative;padding:12px;border-radius:14px;border:2px dashed var(--glass-border);
  background:rgba(255,255,255,.02);min-height:90px;display:grid;gap:2px;align-content:start;}
.slot.required{border-color:rgba(255,123,84,.35);}
.slot.optional{border-color:rgba(90,209,255,.25);}
.slot.filled{border-style:solid;border-color:var(--accent-5);background:rgba(57,255,143,.05);}
.slot.error{border-color:var(--danger);}
.slot-label{font-size:.62rem;font-weight:900;letter-spacing:.05em;color:var(--accent-4);}
.slot-placeholder{color:var(--text-2);font-size:.74rem;}
.slot strong{font-size:.82rem;}
.slot small{color:var(--text-2);font-size:.68rem;}
.slot-remove{position:absolute;top:6px;right:6px;width:20px;height:20px;border-radius:50%;border:none;
  background:rgba(255,84,112,.18);color:var(--danger);cursor:pointer;font-size:.7rem;}
.wire-path{stroke-dasharray:6 6;}

.diagnostics-panel h2{margin-bottom:10px;}
.diag-row{display:flex;justify-content:space-between;font-size:.78rem;padding:4px 0;color:var(--text-2);}
.diag-bar{height:6px;border-radius:4px;background:rgba(255,255,255,.08);margin-bottom:6px;overflow:hidden;}
.diag-bar-fill{height:100%;background:var(--accent-5);}
.diag-bar-fill.warn{background:var(--accent-4);}
.diag-bar-fill.danger{background:var(--danger);}
.diag-log{margin-top:10px;padding:10px;border-radius:10px;background:rgba(0,0,0,.25);font-size:.72rem;
  color:var(--accent-5);line-height:1.6;font-family:monospace;}

.cards-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;margin:20px 0;}
.lesson-card,.mission-card,.achievement-card,.glossary-card,.progress-card{padding:16px;border-radius:16px;
  background:var(--glass-bg);border:1px solid var(--glass-border);}
.lesson-card h3,.mission-card h3{margin-top:0;color:var(--accent-1);font-size:.95rem;}
.achievement-card{text-align:center;}
.achievement-card.locked{opacity:.4;}
.achievement-icon{font-size:2rem;display:block;margin-bottom:6px;}
.glossary-card strong{color:var(--accent-4);}
.progress-card h3{margin:0 0 6px;font-size:.78rem;color:var(--text-2);text-transform:uppercase;letter-spacing:.05em;}
.progress-card p{margin:0;font-size:1.5rem;font-weight:800;color:var(--accent-1);}

.settings-panel{padding:20px;display:grid;gap:14px;max-width:420px;margin:20px 0;}
.settings-panel label{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:.88rem;}
.settings-panel select{padding:6px 10px;border-radius:8px;background:var(--bg-2);color:var(--text-1);
  border:1px solid var(--glass-border);}

.toast{padding:11px 16px;border-radius:12px;margin-top:8px;font-size:.82rem;font-weight:700;
  background:var(--glass-bg);border:1px solid var(--glass-border);backdrop-filter:blur(8px);max-width:320px;}
.toast-success{border-color:var(--accent-5);color:var(--accent-5);}
.toast-error{border-color:var(--danger);color:var(--danger);}
.toast-info{border-color:var(--accent-1);color:var(--accent-1);}

.modal-overlay{position:fixed;inset:0;z-index:2000;display:none;place-items:center;
  background:rgba(4,8,18,.62);backdrop-filter:blur(6px);padding:18px;}
.modal-overlay.active{display:grid;}
.modal-content{position:relative;width:min(480px,94vw);max-height:84vh;overflow-y:auto;padding:26px;}
.modal-close-btn{position:absolute;right:12px;top:12px;border:0;background:rgba(255,255,255,.09);
  color:var(--text-1);width:30px;height:30px;border-radius:9px;cursor:pointer;}
.score-summary{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:16px;}
.badge{display:inline-block;padding:5px 10px;border-radius:10px;background:rgba(90,209,255,.14);
  border:1px solid var(--accent-1);color:var(--accent-1);font-size:.74rem;font-weight:800;}
.match-card{padding:14px;border-radius:12px;background:rgba(255,255,255,.04);border:1px solid var(--glass-border);
  margin:10px 0 16px;}
.parts-list{list-style:none;margin:0;padding:0;display:grid;gap:6px;}
.parts-list li{display:flex;justify-content:space-between;font-size:.8rem;color:var(--text-2);
  padding:6px 10px;border-radius:8px;background:rgba(255,255,255,.02);}

/* ===== Build-complete celebration ===== */
.celebration-overlay{position:fixed;inset:0;z-index:3000;display:none;place-items:center;
  background:rgba(4,8,18,.68);backdrop-filter:blur(7px);padding:18px;}
.celebration-overlay.active{display:grid;animation:celebrationFade .25s ease both;}
.celebration-card{position:relative;width:min(420px,94vw);padding:30px 28px 26px;text-align:center;overflow:hidden;
  border:1px solid rgba(90,209,255,.65);border-radius:26px;color:var(--text-1);
  background:radial-gradient(circle at 50% 14%,rgba(90,209,255,.18),transparent 30%),linear-gradient(145deg,#151e36,#0c1020);
  box-shadow:0 0 0 4px rgba(139,108,255,.1),0 18px 80px rgba(0,0,0,.6);animation:celebrationPop .48s cubic-bezier(.2,.9,.2,1) both;}
.celebration-close{position:absolute;right:12px;top:12px;border:0;background:rgba(255,255,255,.09);color:var(--text-1);
  width:30px;height:30px;border-radius:9px;cursor:pointer;font-size:.9rem;z-index:3;}
.celebration-kicker{margin:14px 0 5px;color:var(--accent-4);font-size:.7rem;font-weight:900;letter-spacing:.14em;}
.celebration-card h2{margin:0;background:linear-gradient(90deg,var(--accent-1),#fff,var(--accent-3));-webkit-background-clip:text;background-clip:text;color:transparent;font-size:2rem;}
.celebration-card>p:not(.celebration-kicker){color:var(--text-2);margin:8px 0 15px;}
.built-device{position:relative;display:grid;place-items:center;margin:0 auto;width:108px;height:155px;border-radius:20px;
  background:linear-gradient(145deg,#344863,#101928);border:4px solid var(--accent-1);box-shadow:0 0 24px rgba(90,209,255,.7),inset 0 0 18px rgba(90,209,255,.26);
  animation:deviceFloat 2s ease-in-out infinite;overflow:hidden;}
.built-device.badge-device{width:118px;height:118px;border-radius:50%;background:radial-gradient(circle,#274c67,#101827 65%);}
.built-device span{font-size:3.3rem;filter:drop-shadow(0 3px 4px #000);z-index:1;}
.built-device.badge-device span{font-size:4.4rem;}
.device-scan{position:absolute;left:6px;right:6px;height:3px;background:var(--accent-5);box-shadow:0 0 12px var(--accent-5);animation:deviceScan 1.45s linear infinite;}
.celebration-score{display:inline-block;margin:2px 0 17px;padding:9px 14px;border-radius:16px;color:#07111d;font-weight:900;
  background:linear-gradient(90deg,var(--accent-4),var(--accent-5));}
.confetti-field{position:absolute;inset:0;pointer-events:none;overflow:hidden;}
.confetti-field span{position:absolute;left:var(--x);top:-25px;font-size:1.2rem;animation:confettiFall calc(1.7s + var(--i)*.08s) ease-in forwards;animation-delay:calc(var(--i)*.035s);}
.celebration-card.level-1{border-color:var(--accent-5);}
.celebration-card.level-2{border-color:var(--accent-4);}
.celebration-card.level-3{border-color:var(--accent-2);}

/* ===== Launch celebration (rocket flying) ===== */
.launch-card{border-color:var(--accent-3);}
.launch-pad{position:relative;height:180px;display:flex;align-items:flex-end;justify-content:center;margin-bottom:6px;}
.rocket-flying{position:relative;font-size:3.2rem;animation:rocketLaunch 1.8s cubic-bezier(.3,0,.4,1) forwards;}
.rocket-flying span{display:block;filter:drop-shadow(0 4px 8px rgba(0,0,0,.5));}
.flame{position:absolute;left:50%;top:100%;width:14px;height:34px;transform:translateX(-50%);
  background:linear-gradient(180deg,var(--accent-4),var(--accent-3),transparent);border-radius:0 0 50% 50%;
  filter:blur(1px);animation:flameFlicker .12s infinite alternate;}
.smoke-cloud{position:absolute;bottom:0;width:120px;height:34px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,255,255,.5),transparent 70%);animation:smokeGrow 1.8s ease-out forwards;}
@keyframes rocketLaunch{0%{transform:translateY(0) rotate(0);}70%{transform:translateY(-140px) rotate(-3deg);}100%{transform:translateY(-170px) rotate(0);opacity:0;}}
@keyframes flameFlicker{from{height:34px;}to{height:24px;}}
@keyframes smokeGrow{from{opacity:.7;transform:scale(.4);}to{opacity:0;transform:scale(2.2);}}

@keyframes celebrationFade{from{opacity:0}to{opacity:1}}
@keyframes celebrationPop{from{opacity:0;transform:scale(.68) translateY(32px)}to{opacity:1;transform:scale(1) translateY(0)}}
@keyframes deviceFloat{0%,100%{transform:translateY(0) rotate(-1deg)}50%{transform:translateY(-9px) rotate(1deg)}}
@keyframes deviceScan{from{top:8%}to{top:94%}}
@keyframes confettiFall{to{top:108%;transform:rotate(540deg);opacity:0}}

.slot.drag-over{border-color:var(--accent-1);box-shadow:0 0 0 3px rgba(90,209,255,.25) inset;}
.palette-item.dragging{opacity:.4;}