/* GESTURE TEARDOWN — dark gallery / studio look (continuation of the
   gesture-showcase visual identity), plus floating part labels */

:root{
  --bg0:#0b0e13; --bg1:#05070a;
  --ink:#e9eef3; --muted:rgba(233,238,243,.45);
  --accent:#74d8ff; --warm:#ffc9a3;
  --line:rgba(255,255,255,.10); --panel:rgba(255,255,255,.045);
  --disp:'Fraunces', Georgia, serif;
  --mono:'Space Mono','Courier New',monospace;
}
*{ box-sizing:border-box; }
html, body{
  margin:0; height:100%; overflow:hidden;
  background:var(--bg1); color:var(--ink); font-family:var(--mono);
}
#scene{
  position:fixed; inset:0; display:block; width:100%; height:100%;
  background:radial-gradient(120% 90% at 50% 22%, #161b24 0%, var(--bg0) 45%, var(--bg1) 100%);
}
#cam{ display:none; }

body::before{ content:""; position:fixed; inset:0; pointer-events:none; z-index:2;
  background:radial-gradient(120% 120% at 50% 45%, transparent 55%, rgba(0,0,0,.55) 100%); }

.hud{ position:fixed; z-index:5; }

.brand{ left:28px; top:24px; }
.brand .kic{ font-size:11px; letter-spacing:4px; color:var(--accent); text-transform:uppercase; }
.brand h1{ font-family:var(--disp); font-style:italic; font-weight:600; font-size:34px; margin:2px 0 0; line-height:1; }
.brand .obj{ font-size:12px; color:var(--muted); letter-spacing:1px; margin-top:6px; }

.telem{
  right:24px; top:24px; width:206px; padding:14px 16px;
  border:1px solid var(--line); border-radius:14px;
  background:var(--panel); backdrop-filter:blur(14px);
}
.telem h2{ font-size:9px; letter-spacing:3px; color:var(--muted); margin:0 0 12px; text-transform:uppercase; }
#camPrev{ width:100%; height:auto; display:block; margin-bottom:10px; border-radius:9px;
  border:1px solid var(--line); background:#000; }
.row{ display:flex; justify-content:space-between; font-size:13px; line-height:1.7; }
.row .k{ color:var(--muted); } .row .v{ color:var(--ink); }
.row .v.on{ color:var(--accent); } .row .v.warn{ color:var(--warm); }
.control{ margin-top:10px; }
.control label{ display:block; font-size:10px; letter-spacing:2px; color:var(--muted); margin-bottom:4px; }
input[type=range]{ width:100%; accent-color:var(--accent); }

.mode{
  left:50%; top:26px; transform:translateX(-50%);
  font-size:11px; letter-spacing:3px; color:var(--muted);
  text-transform:uppercase; transition:.2s;
}
.mode.act{ color:var(--accent); text-shadow:0 0 16px rgba(116,216,255,.5); }

.hint{
  left:50%; bottom:26px; transform:translateX(-50%);
  font-size:12px; color:var(--muted); text-align:center; width:92%; max-width:640px;
}
.hint b{ color:var(--ink); font-weight:400; border-bottom:1px solid var(--accent); }

/* floating part-name tags */
#labels{ position:fixed; inset:0; z-index:4; pointer-events:none; }
.plabel{
  position:absolute; transform:translate(-50%, -130%);
  font-family:var(--mono); font-size:11px; letter-spacing:1.5px;
  text-transform:uppercase; color:var(--ink); white-space:nowrap;
  padding:4px 10px; border:1px solid var(--line); border-radius:999px;
  background:rgba(11,14,19,.72); backdrop-filter:blur(6px);
  opacity:0; transition:opacity .18s;
}
.plabel.show{ opacity:1; }
.plabel.hot{ color:var(--accent); border-color:rgba(116,216,255,.5);
  text-shadow:0 0 12px rgba(116,216,255,.5); }

.ov{
  position:fixed; inset:0; z-index:8; display:flex; flex-direction:column;
  align-items:center; justify-content:center; gap:10px;
  background:rgba(5,7,10,.7); backdrop-filter:blur(6px);
}
.ov.hide{ display:none; }
.ov .t{ font-family:var(--disp); font-style:italic; font-size:22px; }
.ov .s{ font-size:13px; color:var(--muted); text-align:center; line-height:1.7; }
.ov .s.warn{ color:var(--warm); }

/* product switcher (CAR / PHONE / DSLR) */
.switch{
  left:50%; bottom:64px; transform:translateX(-50%);
  display:flex; gap:8px; padding:7px;
  border:1px solid var(--line); border-radius:999px;
  background:var(--panel); backdrop-filter:blur(14px);
}
.switch button{
  font-family:var(--mono); font-size:11px; letter-spacing:1px;
  color:var(--muted); background:transparent; border:0;
  padding:8px 16px; border-radius:999px; cursor:pointer; transition:.25s;
}
.switch button:hover{ color:var(--ink); }
.switch button.active{
  color:#05070a; background:var(--accent);
  box-shadow:0 0 22px rgba(116,216,255,.45);
}

/* Back Button */
.back-btn {
  position: fixed;
  top: 111px;
  left: 29px;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(11, 14, 19, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 2px solid rgba(116, 216, 255, 0.3);
  color: var(--accent);
  padding: 12px 20px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  letter-spacing: 1px;
}

.back-btn:hover {
  background: rgba(116, 216, 255, 0.1);
  border-color: var(--accent);
  transform: translateX(-4px);
  box-shadow: 0 4px 20px rgba(116, 216, 255, 0.3);
}

.back-btn:active {
  transform: translateX(-2px);
}

.back-arrow {
  font-size: 18px;
  height: 33px;
  transition: transform 0.3s ease;
}

.back-btn:hover .back-arrow {
  transform: translateX(-4px);
}

.back-text {
  font-weight: 600;
  font-family: var(--mono);
}

/* Mobile responsive */
@media (max-width: 768px) {
  .back-btn {
    top: 108px;
    left: 27px;
    padding: 10px 16px;
    font-size: 13px;
    gap: 6px;
  }

  .back-arrow {
    font-size: 16px;
  }

  .back-text {
    display: none;
  }
}

@media (max-width: 480px) {
  .back-btn {
    top: 107px;
    left: 26px;
    padding: 8px 12px;
    min-width: 44px;
    justify-content: center;
  }
}