/* Shanghai 3D map - UI chrome.
 *
 * The map itself owns the whole viewport; everything here floats above it. All
 * panel colours come from CSS custom properties that app.js rewrites when the
 * theme changes, so switching themes never touches individual rules.
 */

:root {
  --bg: #05070d;
  --fg: #dfe8ff;
  --fg-dim: #8c9ab8;
  --panel: rgba(10, 14, 24, 0.82);
  --panel-brd: rgba(120, 145, 200, 0.22);
  --accent: #2fd4c8;
  --accent-dim: rgba(47, 212, 200, 0.16);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  --r: 10px;
  --safe-t: env(safe-area-inset-top, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-l: env(safe-area-inset-left, 0px);
  --safe-r: env(safe-area-inset-right, 0px);
}

body[data-theme='day'] {
  --bg: #dfe6ef;
  --fg: #1c2536;
  --fg-dim: #5b6880;
  --panel: rgba(252, 253, 255, 0.86);
  --panel-brd: rgba(70, 95, 140, 0.20);
  --accent: #0f8f86;
  --accent-dim: rgba(15, 143, 134, 0.12);
  --shadow: 0 8px 28px rgba(40, 60, 90, 0.18);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--fg);
  font: 14px/1.5 system-ui, -apple-system, 'Segoe UI', 'PingFang SC',
        'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  -webkit-text-size-adjust: 100%;
}

#view, #overlay {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}
#view { touch-action: none; cursor: grab; }
#view.grabbing { cursor: grabbing; }
/* The label overlay must not eat pointer events meant for the 3D canvas. */
#overlay { pointer-events: none; }

.hidden { display: none !important; }

/* --- title ---------------------------------------------------------------- */

#title {
  position: fixed;
  top: calc(14px + var(--safe-t));
  left: calc(16px + var(--safe-l));
  z-index: 5;
  pointer-events: none;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
}
body[data-theme='day'] #title { text-shadow: 0 1px 8px rgba(255, 255, 255, 0.7); }
#title h1 {
  margin: 0;
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.06em;
}
#title p {
  margin: 2px 0 0;
  font-size: 11px;
  color: var(--fg-dim);
  letter-spacing: 0.04em;
}

/* --- control panel -------------------------------------------------------- */

#panel {
  position: fixed;
  top: calc(72px + var(--safe-t));
  left: calc(16px + var(--safe-l));
  z-index: 6;
  width: 236px;
  max-height: calc(100vh - 150px - var(--safe-t) - var(--safe-b));
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 4px 14px 12px;
  border: 1px solid var(--panel-brd);
  border-radius: var(--r);
  background: var(--panel);
  backdrop-filter: blur(14px) saturate(1.3);
  -webkit-backdrop-filter: blur(14px) saturate(1.3);
  box-shadow: var(--shadow);
  scrollbar-width: thin;
  transition: transform 0.22s ease, opacity 0.22s ease;
}
#panel::-webkit-scrollbar { width: 8px; }
#panel::-webkit-scrollbar-thumb {
  background: var(--panel-brd);
  border-radius: 4px;
}
#panel.collapsed {
  transform: translateX(calc(-100% - 24px));
  opacity: 0;
  pointer-events: none;
}

#panel section { margin: 12px 0 0; }
#panel h2 {
  margin: 0 0 7px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--fg-dim);
  text-transform: uppercase;
}

#panel-toggle {
  position: fixed;
  top: calc(72px + var(--safe-t));
  left: calc(16px + var(--safe-l));
  z-index: 7;
  width: 34px;
  height: 34px;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 0;
  font-size: 15px;
  color: var(--fg);
  border: 1px solid var(--panel-brd);
  border-radius: 9px;
  background: var(--panel);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
  cursor: pointer;
}

/* --- buttons -------------------------------------------------------------- */

.btns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5px;
}
.btns button, button.mini {
  padding: 6px 4px;
  font: inherit;
  font-size: 12px;
  color: var(--fg);
  border: 1px solid var(--panel-brd);
  border-radius: 7px;
  background: transparent;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.btns button:hover, button.mini:hover {
  background: var(--accent-dim);
  border-color: var(--accent);
}
.btns button:active { transform: translateY(1px); }
.btns button.on {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}
button.mini { padding: 4px 12px; font-size: 12px; }

/* --- selects and sliders -------------------------------------------------- */

.sel, .rng {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin: 6px 0;
  font-size: 12px;
  color: var(--fg-dim);
}
.rng { flex-direction: column; align-items: stretch; gap: 4px; }
.rng span { display: flex; justify-content: space-between; }
.rng b { color: var(--accent); font-weight: 600; }

select {
  flex: 1 1 auto;
  min-width: 0;
  max-width: 140px;
  padding: 5px 6px;
  font: inherit;
  font-size: 12px;
  color: var(--fg);
  border: 1px solid var(--panel-brd);
  border-radius: 7px;
  background: var(--panel);
  cursor: pointer;
}
select:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

input[type='range'] {
  width: 100%;
  height: 20px;
  margin: 0;
  accent-color: var(--accent);
  background: transparent;
  cursor: pointer;
}

/* --- layer toggles -------------------------------------------------------- */

#layers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px 6px;
}
.row {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 4px 5px;
  font-size: 12px;
  border-radius: 6px;
  cursor: pointer;
  user-select: none;
}
.row:hover { background: var(--accent-dim); }
.row input { margin: 0; accent-color: var(--accent); cursor: pointer; flex: 0 0 auto; }
.row span {
  flex: 1 1 auto;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

/* --- hints ---------------------------------------------------------------- */

.hint p {
  margin: 10px 0 0;
  font-size: 10.5px;
  line-height: 1.6;
  color: var(--fg-dim);
}

/* --- info popup ----------------------------------------------------------- */

#info {
  position: fixed;
  right: calc(16px + var(--safe-r));
  bottom: calc(52px + var(--safe-b));
  z-index: 6;
  max-width: 268px;
  padding: 12px 14px;
  border: 1px solid var(--panel-brd);
  border-radius: var(--r);
  background: var(--panel);
  backdrop-filter: blur(14px) saturate(1.3);
  -webkit-backdrop-filter: blur(14px) saturate(1.3);
  box-shadow: var(--shadow);
}
#info .info-h {
  margin: 0 0 2px;
  font-size: 14.5px;
  font-weight: 600;
  padding-right: 18px;
}
#info .info-sub {
  margin: 0 0 8px;
  font-size: 11px;
  color: var(--fg-dim);
}
#info dl { margin-top: 8px; }
#info dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 3px 12px;
  margin: 0;
  font-size: 12px;
}
#info dt { color: var(--fg-dim); }
#info dd {
  margin: 0;
  text-align: right;
  font-variant-numeric: tabular-nums;
}
#info .x {
  position: absolute;
  top: 6px;
  right: 8px;
  width: 20px;
  height: 20px;
  padding: 0;
  font-size: 15px;
  line-height: 1;
  color: var(--fg-dim);
  border: 0;
  background: transparent;
  cursor: pointer;
}
#info .x:hover { color: var(--fg); }

/* --- hud ------------------------------------------------------------------ */

#hud {
  position: fixed;
  left: calc(16px + var(--safe-l));
  bottom: calc(12px + var(--safe-b));
  z-index: 5;
  display: flex;
  gap: 14px;
  font-size: 10.5px;
  color: var(--fg-dim);
  font-variant-numeric: tabular-nums;
  pointer-events: none;
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.5);
}
body[data-theme='day'] #hud { text-shadow: none; }

/* --- busy indicator ------------------------------------------------------- */

#busy {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 9;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 20px 30px;
  border: 1px solid var(--panel-brd);
  border-radius: var(--r);
  background: var(--panel);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
  pointer-events: none;
}
.busy-msg { font-size: 12.5px; color: var(--fg-dim); }
.spinner {
  width: 26px;
  height: 26px;
  border: 2.5px solid var(--panel-brd);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  .spinner { animation-duration: 2.4s; }
  #panel { transition: none; }
}

/* --- narrow screens ------------------------------------------------------- */

@media (max-width: 720px) {
  #panel-toggle { display: flex; }
  #panel {
    top: calc(114px + var(--safe-t));
    width: calc(100vw - 32px - var(--safe-l) - var(--safe-r));
    max-width: 300px;
    max-height: calc(100vh - 200px - var(--safe-t) - var(--safe-b));
  }
  #title h1 { font-size: 16px; }
  #info {
    right: calc(10px + var(--safe-r));
    left: calc(10px + var(--safe-l));
    max-width: none;
  }
}