* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  font-family: "Segoe UI", "Malgun Gothic", sans-serif;
  background: radial-gradient(ellipse at 50% 30%, #3a3f4b 0%, #23262e 70%, #191b21 100%);
  touch-action: none;
}

#view { position: fixed; inset: 0; display: block; touch-action: none; }

#topbars {
  position: fixed;
  top: 8px; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  z-index: 10;
  width: calc(100vw - 10px);
  pointer-events: none; /* 빈 영역은 3D 조작을 막지 않게 */
}
#topbars > * { pointer-events: auto; }

#toolbar {
  display: flex; gap: 6px; align-items: center;
  flex-wrap: wrap; justify-content: center;
  padding: 8px 10px;
  background: rgba(20, 22, 28, 0.78);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 14px;
  backdrop-filter: blur(8px);
  max-width: 100%;
}

#toolbar button {
  font-size: 14px;
  padding: 8px 12px;
  border-radius: 9px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.07);
  color: #e8eaf0;
  cursor: pointer;
  white-space: nowrap;
  transition: background .15s;
}
#toolbar button:hover { background: rgba(255,255,255,0.16); }
#toolbar button.active { background: #4f7cff; border-color: #6f95ff; }
#toolbar button:disabled { opacity: .35; cursor: default; }
#toolbar .sep { width: 1px; height: 22px; background: rgba(255,255,255,0.15); margin: 0 3px; }
.gone { display: none !important; }

/* ◫ 분할 화면: 오른쪽 절반에 같은 앱을 iframe으로 */
#splitPane {
  position: fixed;
  top: 0; right: 0;
  width: 50vw; height: 100vh;
  z-index: 5;
  border-left: 1px solid rgba(255,255,255,0.18);
  background: #23262e;
}
#splitPane.hidden { display: none; }
#splitPane iframe { width: 100%; height: 100%; border: 0; display: block; }
body.split #topbars { width: calc(50vw - 10px); left: 25%; }
body.split .panel { left: 25%; }
body.split #hint { left: 25%; }

#paperBar {
  display: flex; gap: 6px;
  flex-wrap: wrap; justify-content: center;
  padding: 6px 8px;
  background: rgba(20, 22, 28, 0.6);
  border: 1px solid rgba(255,255,255,0.10);
  border-radius: 12px;
  backdrop-filter: blur(8px);
  max-width: 100%;
}
#paperBar.hidden { display: none; }
#paperBar button {
  font-size: 13px;
  padding: 5px 12px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.07);
  color: #e8eaf0;
  cursor: pointer;
}
#paperBar button.active { background: #4f7cff; border-color: #6f95ff; }
#paperBar button.openBtn { background: rgba(255, 186, 73, 0.14); border-color: rgba(255, 186, 73, 0.45); }
#paperBar button.openBtn.hidden { display: none; }
#paperBar button.locked { display: none; }

.panel {
  position: fixed;
  bottom: 56px; left: 50%;
  transform: translateX(-50%);
  display: flex; gap: 8px;
  padding: 10px 12px;
  background: rgba(20, 22, 28, 0.85);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 14px;
  backdrop-filter: blur(8px);
  z-index: 10;
}
.panel.hidden { display: none; }
.panel button {
  font-size: 14px;
  padding: 8px 14px;
  border-radius: 9px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.07);
  color: #e8eaf0;
  cursor: pointer;
}
.panel .dir.active { background: #4f7cff; border-color: #6f95ff; }

#overlayPanel { align-items: center; flex-wrap: wrap; max-width: calc(100vw - 24px); }
#overlaySrcs { display: flex; gap: 5px; flex-wrap: wrap; }
#overlaySrcs button { font-size: 13px; padding: 6px 10px; }
#overlaySrcs button.active { background: #4f7cff; border-color: #6f95ff; }
#ovMirror.active { background: #4f7cff; border-color: #6f95ff; }
#ovScale { width: 110px; accent-color: #4f7cff; }

#hint {
  position: fixed;
  bottom: 14px; left: 50%;
  transform: translateX(-50%);
  padding: 7px 14px;
  background: rgba(20, 22, 28, 0.6);
  border-radius: 20px;
  color: #aeb4c2;
  font-size: 13px;
  z-index: 9;
  white-space: nowrap;
  max-width: calc(100vw - 20px);
  overflow: hidden;
  text-overflow: ellipsis;
}