/* =========================================================
   HIDDEN SCIENCE 1 — STYLE SHEET
   Dark glassmorphism, science-museum aesthetic
   ========================================================= */

:root{
  --bg-1:#05060a;
  --bg-2:#0b0f1a;
  --bg-3:#101728;
  --glass-bg: rgba(255,255,255,0.05);
  --glass-border: rgba(255,255,255,0.12);
  --accent-cyan:#4de3ff;
  --accent-violet:#8b6bff;
  --accent-amber:#ffc857;
  --accent-green:#4dffb8;
  --accent-red:#ff5d6c;
  --text-1:#eef2ff;
  --text-2:#9aa5c3;
  --radius-lg:22px;
  --radius-md:14px;
  --radius-sm:8px;
  --shadow-glow: 0 0 24px rgba(77,227,255,0.25);
  --transition-fast: 180ms cubic-bezier(.4,0,.2,1);
  --transition-med: 380ms cubic-bezier(.4,0,.2,1);
  font-size: 16px;
}

*{box-sizing:border-box;}
html,body{margin:0;padding:0;height:100%;}
body{
  min-height:100vh;
  background: radial-gradient(circle at 20% 10%, #131c33 0%, var(--bg-2) 45%, var(--bg-1) 100%);
  color:var(--text-1);
  font-family:"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

a{color:var(--accent-cyan);}

/* ---------- Background particles ---------- */
#bg-particles{
  position:fixed; inset:0; z-index:0; pointer-events:none;
  overflow:hidden;
}
.particle{
  position:absolute;
  border-radius:50%;
  background: radial-gradient(circle, rgba(77,227,255,.9), rgba(77,227,255,0));
  opacity:.5;
  animation: floatUp linear infinite;
  will-change: transform;
}
@keyframes floatUp{
  from{ transform:translateY(0) translateX(0); }
  to{ transform:translateY(-120vh) translateX(20px); }
}

/* ---------- Glass base ---------- */
.glass{
  background: var(--glass-bg);
  border:1px solid var(--glass-border);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  box-shadow: 0 8px 32px rgba(0,0,0,.35);
}

/* ---------- HUD ---------- */
#hud{
  position:sticky; top:0; z-index:50;
  display:flex; align-items:center; justify-content:space-between;
  gap:16px; padding:14px 24px;
  border-radius:0 0 var(--radius-lg) var(--radius-lg);
}
.logo{font-weight:700; font-size:1.15rem; letter-spacing:.5px;}
.logo-num{color:var(--accent-amber);}
.hud-center{flex:1; max-width:420px; display:flex; flex-direction:column; align-items:center; gap:4px; margin:0 20px;}
.progress-track{
  width:100%; height:10px; border-radius:6px;
  background: rgba(255,255,255,.08);
  overflow:hidden;
  border:1px solid rgba(255,255,255,.08);
}
.progress-fill{
  height:100%; width:0%;
  background: linear-gradient(90deg,var(--accent-cyan),var(--accent-violet));
  box-shadow: 0 0 12px var(--accent-cyan);
  transition: width var(--transition-med);
}
#progressLabel{font-size:.75rem; color:var(--text-2);}
.hud-right{display:flex; gap:8px;}
.icon-btn{
  width:40px; height:40px; border-radius:50%;
  border:1px solid var(--glass-border);
  background: rgba(255,255,255,.04);
  color:var(--text-1); font-size:1.1rem; cursor:pointer;
  display:flex; align-items:center; justify-content:center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}
.icon-btn:hover{ transform:translateY(-2px) scale(1.05); box-shadow:var(--shadow-glow); background:rgba(255,255,255,.09); }
.icon-btn:focus-visible{ outline:2px solid var(--accent-cyan); outline-offset:2px; }

/* ---------- Main layout ---------- */
#app{
  position:relative; z-index:1;
  max-width:1200px; margin:0 auto; padding:32px 24px 96px;
  min-height:80vh;
}

.mission{
  animation: fadeSlideIn var(--transition-med) both;
}
@keyframes fadeSlideIn{
  from{ opacity:0; transform:translateY(24px); }
  to{ opacity:1; transform:translateY(0); }
}

.mission-header{ text-align:center; margin-bottom:36px; }
.mission-tag{
  display:inline-block; padding:4px 14px; border-radius:20px;
  font-size:.75rem; letter-spacing:1.5px; text-transform:uppercase;
  background: linear-gradient(90deg,rgba(77,227,255,.15),rgba(139,107,255,.15));
  border:1px solid rgba(77,227,255,.3); color:var(--accent-cyan); margin-bottom:12px;
}
.mission-title{
  font-size:clamp(1.6rem,3vw,2.4rem); font-weight:800; margin:0 0 8px;
  background: linear-gradient(90deg,#fff,var(--accent-cyan));
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.mission-sub{ color:var(--text-2); font-size:1rem; max-width:680px; margin:0 auto; }

/* ---------- Cards / grid ---------- */
.grid{
  display:grid; gap:20px;
  grid-template-columns: repeat(auto-fit, minmax(180px,1fr));
}
.card{
  border-radius: var(--radius-lg);
  padding:20px; cursor:pointer; position:relative; overflow:hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}
.card:hover, .card:focus-visible{
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
  border-color: rgba(77,227,255,.5);
}
.card .card-icon{ font-size:2.4rem; display:block; margin-bottom:10px; filter:drop-shadow(0 0 8px rgba(77,227,255,.4)); }
.card h3{ margin:0 0 6px; font-size:1.05rem; }
.card p{ margin:0; color:var(--text-2); font-size:.85rem; line-height:1.4; }
.card .fact{
  margin-top:10px; font-size:.78rem; color:var(--accent-amber);
  opacity:0; max-height:0; overflow:hidden; transition: opacity var(--transition-med), max-height var(--transition-med);
}
.card:hover .fact, .card:focus-visible .fact{ opacity:1; max-height:80px; margin-top:10px; }

.card.conductor{ border-color: rgba(77,255,184,.35); }
.card.insulator{ border-color: rgba(255,93,108,.35); }

/* ---------- Buttons ---------- */
.btn{
  border:none; border-radius:var(--radius-md); padding:12px 26px;
  font-size:.95rem; font-weight:600; cursor:pointer; color:#04121a;
  background: linear-gradient(90deg,var(--accent-cyan),var(--accent-green));
  box-shadow: 0 4px 18px rgba(77,227,255,.35);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.btn:hover{ transform: translateY(-2px); box-shadow:0 8px 26px rgba(77,227,255,.5); }
.btn:active{ transform: translateY(0); }
.btn.secondary{
  background: transparent; color:var(--text-1);
  border:1px solid var(--glass-border);
}
.btn.ghost{ background:transparent; color:var(--accent-cyan); border:1px solid rgba(77,227,255,.4); }
.btn:disabled{ opacity:.4; cursor:not-allowed; }
.btn-row{ display:flex; gap:14px; justify-content:center; flex-wrap:wrap; margin-top:28px; }

/* ---------- Prediction buttons ---------- */
.predict-row{ display:flex; gap:16px; justify-content:center; margin:28px 0; flex-wrap:wrap; }
.predict-btn{
  min-width:120px; padding:16px 22px; border-radius:var(--radius-md);
  border:1px solid var(--glass-border); background:var(--glass-bg);
  color:var(--text-1); font-weight:700; font-size:1rem; cursor:pointer;
  transition: all var(--transition-fast);
}
.predict-btn:hover{ transform:translateY(-4px); }
.predict-btn.yes:hover{ border-color:var(--accent-green); box-shadow:0 0 20px rgba(77,255,184,.35); }
.predict-btn.no:hover{ border-color:var(--accent-red); box-shadow:0 0 20px rgba(255,93,108,.35); }
.predict-btn.maybe:hover{ border-color:var(--accent-amber); box-shadow:0 0 20px rgba(255,200,87,.35); }
.predict-btn.selected{ box-shadow:0 0 0 2px var(--accent-cyan) inset; }

/* ---------- Circuit Lab ---------- */
.lab-wrap{ display:flex; gap:32px; flex-wrap:wrap; align-items:flex-start; justify-content:center; }
.circuit-board{
  flex:1 1 480px; min-width:320px; border-radius:var(--radius-lg); padding:28px;
  display:flex; flex-direction:column; align-items:center; gap:18px;
  background: radial-gradient(circle at 50% 0%, rgba(139,107,255,.08), transparent 60%);
}
.circuit-svg{ width:100%; max-width:480px; height:auto; }

.slot-tray{
  display:flex; flex-wrap:wrap; gap:14px; justify-content:center;
  flex:1 1 280px; min-width:260px;
}
.material-chip{
  padding:12px 16px; border-radius:var(--radius-md); cursor:grab;
  background: var(--glass-bg); border:1px solid var(--glass-border);
  font-size:.85rem; font-weight:600; display:flex; align-items:center; gap:8px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  touch-action:none; user-select:none;
}
.material-chip:hover{ transform:translateY(-3px); box-shadow:var(--shadow-glow); }
.material-chip.dragging{ opacity:.5; }
.material-chip:focus-visible{ outline:2px solid var(--accent-cyan); }

.drop-slot{
  width:120px; height:80px; border:2px dashed var(--glass-border);
  border-radius:var(--radius-md); display:flex; align-items:center; justify-content:center;
  color:var(--text-2); font-size:.8rem; transition: all var(--transition-fast);
}
.drop-slot.drag-over{ border-color:var(--accent-cyan); box-shadow:0 0 20px rgba(77,227,255,.4); }
.drop-slot.filled{ border-style:solid; border-color:var(--accent-cyan); color:var(--text-1); }

.bulb{
  width:70px; height:70px; border-radius:50%;
  background: radial-gradient(circle, #333 40%, #111 100%);
  transition: all var(--transition-med);
  position:relative;
}
.bulb.on{
  background: radial-gradient(circle, #fff8d0, var(--accent-amber) 55%, #7a5b00 100%);
  box-shadow: 0 0 60px 20px rgba(255,200,87,.7);
}
.bulb.dim{
  background: radial-gradient(circle, #fff2b0, #7a6a2c 60%, #222 100%);
  box-shadow: 0 0 22px 6px rgba(255,200,87,.35);
}
.bulb.spark{ animation: sparkFlicker .5s steps(2) 3; }
@keyframes sparkFlicker{ 0%,100%{filter:brightness(1);} 50%{filter:brightness(2.6);} }

.result-banner{
  margin-top:8px; padding:10px 18px; border-radius:var(--radius-md);
  font-weight:700; font-size:.9rem; text-align:center;
}
.result-banner.on{ background:rgba(77,255,184,.15); color:var(--accent-green); }
.result-banner.off{ background:rgba(255,93,108,.15); color:var(--accent-red); }
.result-banner.dim{ background:rgba(255,200,87,.15); color:var(--accent-amber); }

/* ---------- Wires / electron animation ---------- */
.wire-flow{ stroke-dasharray: 6 10; animation: dashMove 1s linear infinite; }
@keyframes dashMove{ to{ stroke-dashoffset:-32; } }
.electron{ animation: electronMove 1.4s linear infinite; }
@keyframes electronMove{
  from{ offset-distance:0%; }
  to{ offset-distance:100%; }
}

/* ---------- Microscope / atom view ---------- */
.atom-view{
  width:260px; height:260px; margin:0 auto; position:relative;
}
.nucleus{
  position:absolute; top:50%; left:50%; width:36px; height:36px; margin:-18px;
  border-radius:50%; background: radial-gradient(circle,#ff9b6b,#c14d1f);
  box-shadow:0 0 30px rgba(255,155,107,.7);
}
.orbit{
  position:absolute; top:50%; left:50%; border:1px dashed rgba(255,255,255,.25);
  border-radius:50%; transform-origin:center;
}
.electron-dot{
  position:absolute; width:10px; height:10px; border-radius:50%;
  background:var(--accent-cyan); box-shadow:0 0 12px var(--accent-cyan);
  animation: orbitSpin linear infinite;
}
@keyframes orbitSpin{ from{ transform: rotate(0deg) translateX(var(--r)) rotate(0deg); } to{ transform: rotate(360deg) translateX(var(--r)) rotate(-360deg); } }
.electron-dot.free{ animation-duration: 1.2s; }

/* ---------- Sorting / matching ---------- */
.sort-zones{ display:flex; gap:24px; justify-content:center; flex-wrap:wrap; margin-top:24px; }
.sort-zone{
  flex:1 1 240px; min-height:180px; border-radius:var(--radius-lg);
  padding:18px; display:flex; flex-direction:column; gap:10px;
  border:2px dashed var(--glass-border);
}
.sort-zone h4{ margin:0 0 6px; text-align:center; }
.sort-zone.conductor-zone{ border-color: rgba(77,255,184,.4); }
.sort-zone.insulator-zone{ border-color: rgba(255,93,108,.4); }
.sort-zone.drag-over{ box-shadow:var(--shadow-glow); }

/* ---------- Detective / mystery ---------- */
.mystery-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(140px,1fr)); gap:16px; }
.mystery-card{
  border-radius:var(--radius-lg); padding:18px; text-align:center; cursor:pointer;
  border:1px solid var(--glass-border);
}
.mystery-card .guess-btns{ display:flex; gap:6px; justify-content:center; margin-top:10px; }
.mystery-card .guess-btns button{
  flex:1; padding:6px 4px; font-size:.72rem; border-radius:var(--radius-sm);
  border:1px solid var(--glass-border); background:rgba(255,255,255,.04); color:var(--text-1); cursor:pointer;
}
.mystery-card.correct{ border-color:var(--accent-green); box-shadow:0 0 16px rgba(77,255,184,.35); }
.mystery-card.wrong{ border-color:var(--accent-red); box-shadow:0 0 16px rgba(255,93,108,.35); }

/* ---------- Achievements toast ---------- */
.achievement-pop{
  display:flex; align-items:center; gap:14px; padding:14px 18px;
}
.ach-icon{ font-size:2rem; }
.ach-title{ display:block; color:var(--accent-amber); }
.ach-desc{ margin:2px 0 0; font-size:.8rem; color:var(--text-2); }

.toast{
  position:fixed; bottom:24px; left:50%; transform:translateX(-50%) translateY(20px);
  padding:14px 24px; border-radius:var(--radius-md);
  background: var(--glass-bg); border:1px solid var(--glass-border);
  backdrop-filter: blur(14px);
  z-index:200; opacity:0; transition: all var(--transition-med);
  max-width:90vw;
}
.toast.show{ opacity:1; transform:translateX(-50%) translateY(0); }
.toast.hidden{ display:none; }

/* ---------- Modal ---------- */
.modal-overlay{
  position:fixed; inset:0; background:rgba(2,4,10,.72);
  display:flex; align-items:center; justify-content:center; z-index:300;
  backdrop-filter: blur(4px);
}
.modal-overlay.hidden{ display:none; }
.modal{
  max-width:640px; width:92%; max-height:82vh; overflow-y:auto;
  border-radius:var(--radius-lg); padding:32px; position:relative;
}
.modal-close{
  position:absolute; top:16px; right:16px; background:none; border:none;
  color:var(--text-2); font-size:1.2rem; cursor:pointer;
}
.modal h2{ margin-top:0; }
.glossary-item{ padding:10px 0; border-bottom:1px solid var(--glass-border); }
.glossary-item dt{ color:var(--accent-cyan); font-weight:700; }
.glossary-item dd{ margin:4px 0 0; color:var(--text-2); font-size:.88rem; }

/* ---------- Progress note / hint box ---------- */
.hint-box{
  margin:18px auto; max-width:600px; padding:14px 18px; border-radius:var(--radius-md);
  background: rgba(255,200,87,.08); border:1px solid rgba(255,200,87,.3); color:#ffe6ab;
  font-size:.9rem; text-align:center;
}

/* ---------- Intro / story screen ---------- */
.intro-screen{ text-align:center; padding:60px 12px; }
.intro-screen .blackout-icon{ font-size:5rem; animation: pulseGlow 2s ease-in-out infinite; }
@keyframes pulseGlow{ 0%,100%{ filter:drop-shadow(0 0 10px rgba(255,93,108,.4)); } 50%{ filter:drop-shadow(0 0 30px rgba(255,93,108,.8)); } }
.intro-devices{ display:flex; gap:18px; justify-content:center; flex-wrap:wrap; margin:32px 0; font-size:2rem; opacity:.35; }
.message-box{
  max-width:560px; margin:24px auto; padding:22px; border-radius:var(--radius-lg);
  font-style:italic; color:var(--text-2);
}

/* ---------- Timeline (mission map) ---------- */
.mission-map{ display:flex; flex-wrap:wrap; gap:10px; justify-content:center; margin-top:28px; }
.map-node{
  width:52px; height:52px; border-radius:50%; display:flex; align-items:center; justify-content:center;
  border:1px solid var(--glass-border); background:var(--glass-bg); font-size:.85rem; font-weight:700;
  cursor:pointer; color:var(--text-2); transition: all var(--transition-fast);
}
.map-node.done{ background: linear-gradient(135deg,var(--accent-cyan),var(--accent-green)); color:#04121a; border:none; }
.map-node.current{ box-shadow:0 0 0 3px var(--accent-cyan); color:var(--text-1); }
.map-node.locked{ opacity:.35; cursor:not-allowed; }

/* ---------- Ending screen ---------- */
.ending-screen{ text-align:center; padding:60px 12px; }
.next-teaser{
  margin-top:40px; padding:28px; border-radius:var(--radius-lg);
  background: linear-gradient(135deg,rgba(139,107,255,.12),rgba(77,227,255,.08));
  border:1px solid rgba(139,107,255,.35);
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar{ width:10px; }
::-webkit-scrollbar-thumb{ background:rgba(255,255,255,.15); border-radius:6px; }

/* ---------- Focus & accessibility ---------- */
:focus-visible{ outline:2px solid var(--accent-cyan); outline-offset:2px; }
.sr-only{ position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0,0,0,0); }

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce){
  *{ animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; }
}

/* ---------- Responsive ---------- */
@media (max-width:720px){
  #hud{ flex-wrap:wrap; padding:10px 14px; }
  .hud-center{ order:3; width:100%; margin:8px 0 0; }
  .lab-wrap{ flex-direction:column; }
  .mission-title{ font-size:1.5rem; }
}


/* =========================================================
   THEME SYSTEM
   Applied via [data-theme="..."] on <html>
   Base variables (Lab Blue) are defined in :root above.
   Each theme below overrides the palette only.
   ========================================================= */

[data-theme="lab-blue"]{
  --bg-1:#05060a; --bg-2:#0b0f1a; --bg-3:#101728;
  --glass-bg: rgba(255,255,255,0.05); --glass-border: rgba(255,255,255,0.12);
  --accent-cyan:#4de3ff; --accent-violet:#8b6bff; --accent-amber:#ffc857;
  --accent-green:#4dffb8; --accent-red:#ff5d6c;
  --text-1:#eef2ff; --text-2:#9aa5c3;
}

[data-theme="silicon-violet"]{
  --bg-1:#07040f; --bg-2:#120a24; --bg-3:#1c1036;
  --glass-bg: rgba(180,140,255,0.06); --glass-border: rgba(190,150,255,0.16);
  --accent-cyan:#c77dff; --accent-violet:#7b2ff7; --accent-amber:#f7b733;
  --accent-green:#9d4dff; --accent-red:#ff4d9e;
  --text-1:#f3ecff; --text-2:#b3a3d9;
}

[data-theme="solar-amber"]{
  --bg-1:#0c0704; --bg-2:#1a1006; --bg-3:#241708;
  --glass-bg: rgba(255,190,90,0.06); --glass-border: rgba(255,190,90,0.18);
  --accent-cyan:#ffb238; --accent-violet:#ff7847; --accent-amber:#ffe066;
  --accent-green:#8bff6b; --accent-red:#ff4d4d;
  --text-1:#fff4e3; --text-2:#c9a985;
}

[data-theme="matrix-green"]{
  --bg-1:#020805; --bg-2:#04120a; --bg-3:#071c12;
  --glass-bg: rgba(80,255,170,0.05); --glass-border: rgba(80,255,170,0.16);
  --accent-cyan:#3dffa0; --accent-violet:#00c78c; --accent-amber:#c8ff3d;
  --accent-green:#3dffa0; --accent-red:#ff5d6c;
  --text-1:#e6fff2; --text-2:#8fd6b3;
}

[data-theme="crimson-pulse"]{
  --bg-1:#0a0407; --bg-2:#170810; --bg-3:#241019;
  --glass-bg: rgba(255,90,130,0.06); --glass-border: rgba(255,90,130,0.18);
  --accent-cyan:#ff5d8f; --accent-violet:#ff2e63; --accent-amber:#ffb84d;
  --accent-green:#4dffb8; --accent-red:#ff3860;
  --text-1:#ffeef2; --text-2:#d99aae;
}

[data-theme="arctic-frost"]{
  --bg-1:#eef3fb; --bg-2:#dde8f6; --bg-3:#c9dcf0;
  --glass-bg: rgba(20,40,80,0.05); --glass-border: rgba(20,40,80,0.14);
  --accent-cyan:#1e90c9; --accent-violet:#5b6bd6; --accent-amber:#e0973a;
  --accent-green:#1fae7e; --accent-red:#d6455a;
  --text-1:#0d1b2e; --text-2:#4b5c73;
}
[data-theme="arctic-frost"] body{
  background: radial-gradient(circle at 20% 10%, #f4f8fd 0%, var(--bg-2) 45%, var(--bg-1) 100%);
}
[data-theme="arctic-frost"] .btn{ color:#fff; }
[data-theme="arctic-frost"] .particle{
  background: radial-gradient(circle, rgba(30,144,201,.6), rgba(30,144,201,0));
}

/* ---------- Theme picker modal ---------- */
.theme-grid{
  display:grid; grid-template-columns: repeat(auto-fit,minmax(140px,1fr)); gap:14px; margin-top:16px;
}
.theme-swatch{
  border-radius: var(--radius-md); padding:16px; cursor:pointer; text-align:center;
  border:2px solid var(--glass-border); background:var(--glass-bg);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.theme-swatch:hover{ transform:translateY(-4px); box-shadow:var(--shadow-glow); }
.theme-swatch.active{ border-color:var(--accent-cyan); box-shadow:var(--shadow-glow); }
.swatch-preview{
  height:44px; border-radius:10px; margin-bottom:10px;
  display:flex; overflow:hidden;
}
.swatch-preview span{ flex:1; }
.theme-swatch h4{ margin:0; font-size:.85rem; }