/* =====================================================================
   Trình xem 360° – Phân lớp tòa nhà
   Giao diện kính lỏng (liquid glass), trung tính, không dùng gradient.
   ===================================================================== */

:root {
  --ink: #f3f6f9;
  --ink-soft: rgba(243, 246, 249, 0.62);
  --ink-faint: rgba(243, 246, 249, 0.38);

  --glass: rgba(14, 18, 24, 0.46);
  --glass-strong: rgba(20, 26, 34, 0.62);
  --glass-line: rgba(255, 255, 255, 0.16);
  --glass-hi: rgba(255, 255, 255, 0.22);

  --radius: 20px;
  --radius-sm: 12px;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.42);

  --backdrop: #05070a;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--backdrop);
  color: var(--ink);
  font-family: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
  overscroll-behavior: none;
}

button, .floor-item, input, select { touch-action: manipulation; }

.app {
  position: relative;
  height: 100vh;
  height: 100dvh;
  width: 100%;
  overflow: hidden;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

/* ---------- Nền mờ ---------- */
.backdrop {
  position: absolute;
  inset: -60px;
  width: calc(100% + 120px);
  height: calc(100% + 120px);
  object-fit: cover;
  filter: blur(46px) saturate(120%) brightness(0.42);
  opacity: 0.9;
  z-index: 0;
  pointer-events: none;
}

.vignette {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: radial-gradient(120% 90% at 50% 42%, rgba(0,0,0,0) 40%, rgba(0,0,0,0.55) 100%);
}

/* ---------- Kính ---------- */
.glass {
  background: var(--glass);
  backdrop-filter: blur(24px) saturate(140%);
  -webkit-backdrop-filter: blur(24px) saturate(140%);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow), inset 0 1px 0 var(--glass-hi), inset 0 -1px 0 rgba(255, 255, 255, 0.04);
}

/* ---------- Panel lớp tầng ---------- */
.panel-floors {
  position: absolute;
  top: 18px;
  right: 18px;
  z-index: 10;
  width: 262px;
  padding: 14px 14px 12px;
}

.panel-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  font-size: 11px;
  letter-spacing: 1.1px;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 10px;
}
.panel-head-hint { letter-spacing: 0; text-transform: none; color: var(--ink-faint); font-size: 11px; }

.floor-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 4px; }

.floor-item {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.16s ease, border-color 0.16s ease, opacity 0.16s ease;
}
.floor-item:hover { background: rgba(255, 255, 255, 0.06); border-color: var(--glass-line); }
.floor-item.hidden-floor { opacity: 0.42; }

.swatch {
  width: 13px;
  height: 13px;
  border-radius: 4px;
  flex: 0 0 auto;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.22), 0 0 14px rgba(255, 255, 255, 0.12);
}
.floor-item .name { font-size: 13px; flex: 1 1 auto; }

/* công tắc hiện/ẩn */
.switch {
  width: 34px;
  height: 19px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid var(--glass-line);
  position: relative;
  flex: 0 0 auto;
  transition: background 0.18s ease;
}
.switch::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink);
  transition: transform 0.18s ease;
}
.floor-item:not(.hidden-floor) .switch { background: rgba(255, 255, 255, 0.32); }
.floor-item:not(.hidden-floor) .switch::after { transform: translateX(15px); }

.panel-note {
  margin: 10px 4px 2px;
  font-size: 11px;
  line-height: 1.5;
  color: var(--ink-faint);
}

/* ---------- Sân khấu ---------- */
.stage-wrap {
  position: absolute;
  inset: 0;
  z-index: 5;
}

#stage {
  position: absolute;
  inset: 0;
  overflow: hidden;
  cursor: grab;
  user-select: none;
  touch-action: none;
  background: transparent;
}
#stage.dragging { cursor: grabbing; }
#stage.pointing { cursor: pointer; }

#viewer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: none;
}

/* ---------- Bộ tải ---------- */
#loader {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: rgba(6, 9, 13, 0.72);
  backdrop-filter: blur(8px);
  font-size: 12.5px;
  letter-spacing: 0.3px;
  color: var(--ink-soft);
  z-index: 20;
  transition: opacity 0.4s ease;
}
#loader.hidden { opacity: 0; pointer-events: none; }

.spinner {
  width: 30px;
  height: 30px;
  border: 2px solid rgba(255, 255, 255, 0.16);
  border-top-color: var(--ink);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Điều khiển dưới ---------- */
.panel-controls {
  position: absolute;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 16px;
  width: min(600px, calc(100% - 36px));
}

.icon-btn {
  appearance: none;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  border: 1px solid var(--glass-line);
  background: rgba(255, 255, 255, 0.05);
  color: var(--ink);
  display: grid;
  place-items: center;
  cursor: pointer;
  flex: 0 0 auto;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.icon-btn:hover { background: rgba(255, 255, 255, 0.12); border-color: var(--glass-hi); }
.icon-btn:active { transform: translateY(1px); }

.readout {
  display: flex;
  align-items: baseline;
  gap: 5px;
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--ink);
  min-width: 96px;
}
.readout .sep { color: var(--ink-faint); }
.readout #hudTotal { color: var(--ink-soft); }
.readout .angle { margin-left: 10px; color: var(--ink-soft); font-size: 12px; }

#frameSlider {
  flex: 1 1 auto;
  appearance: none;
  -webkit-appearance: none;
  height: 4px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.18);
  outline: none;
  cursor: pointer;
}
#frameSlider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  border: none;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.5);
  cursor: pointer;
}
#frameSlider::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--ink); border: none; cursor: pointer;
}

/* ---------- Toast ---------- */
#toast {
  position: absolute;
  bottom: 86px;
  left: 50%;
  transform: translate(-50%, 14px);
  z-index: 30;
  padding: 11px 20px;
  font-size: 13px;
  font-weight: 550;
  color: var(--ink);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.24s ease, transform 0.24s ease;
  max-width: 78%;
  text-align: center;
  white-space: nowrap;
}
#toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- Thẻ tên tầng theo con trỏ ---------- */
.cursor-card {
  position: fixed;
  z-index: 40;
  display: none;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 12px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.2px;
  color: var(--ink);
  pointer-events: none;
  white-space: nowrap;
}
.cursor-card.show { display: flex; }
.cursor-dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  flex: 0 0 auto;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.25);
}

/* ---------- Màn hình hẹp ---------- */
@media (max-width: 1080px) {
  .panel-floors { width: 224px; }
}

@media (max-width: 720px) {
  .panel-floors {
    top: 10px;
    left: 10px;
    right: 10px;
    bottom: auto;
    width: auto;
    max-height: none;
    padding: 10px 12px;
  }
  .panel-head { margin-bottom: 8px; }
  .floor-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
    padding-bottom: 2px;
  }
  .floor-item { flex: 0 0 auto; padding: 7px 9px; gap: 8px; }
  .floor-item .name { font-size: 12px; }
  .floor-item .switch { display: none; }
  .panel-note { display: none; }

  .panel-controls {
    left: 10px;
    right: 10px;
    bottom: 10px;
    transform: none;
    width: auto;
    gap: 10px;
    padding: 10px 12px;
  }
  .readout { min-width: 72px; font-size: 12px; }
  .readout .angle { margin-left: 6px; }

  #toast { bottom: 82px; white-space: normal; max-width: 88%; }
}