/* Layout: full-bleed 3D scene; floating panels — finder on the left, details on the right,
   tool dock at the bottom, minimap bottom-right. Yellow number badges echo the official campus map. */
:root {
  --bg: #e9eef1;
  --panel: rgba(255, 255, 255, 0.94);
  --panel-solid: #ffffff;
  --ink: #17181c;
  --muted: #5b616c;
  --line: #e1e3e6;
  --hover: #f1f2ee;
  --accent: #f5b335;
  --accent-ink: #17181c;
  --focus: #2f6fd0;
  --zone-ink: rgba(23, 24, 28, 0.62);
  --zone-halo: rgba(255, 255, 255, 0.85);
  --mini-ground: #cdd8bf;
  --shadow: 0 1px 2px rgba(20, 24, 30, 0.08), 0 8px 24px rgba(20, 24, 30, 0.12);

  --font-display: 'Chakra Petch', 'IBM Plex Sans Thai', system-ui, sans-serif;
  --font-body: 'IBM Plex Sans Thai', system-ui, -apple-system, 'Segoe UI', sans-serif;

  --step--1: 0.8125rem;
  --step-0: 0.9375rem;
  --step-1: 1.125rem;
  --step-2: 1.375rem;
  --radius: 14px;
  --gap: 16px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12151b;
    --panel: rgba(24, 27, 34, 0.94);
    --panel-solid: #181b22;
    --ink: #f0eee8;
    --muted: #a3a8b2;
    --line: #2d313b;
    --hover: #232731;
    --zone-ink: rgba(23, 24, 28, 0.62);
    --zone-halo: rgba(255, 255, 255, 0.85);
    --mini-ground: #3a4636;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #12151b;
  --panel: rgba(24, 27, 34, 0.94);
  --panel-solid: #181b22;
  --ink: #f0eee8;
  --muted: #a3a8b2;
  --line: #2d313b;
  --hover: #232731;
  --zone-ink: rgba(23, 24, 28, 0.62);
  --zone-halo: rgba(255, 255, 255, 0.85);
  --mini-ground: #3a4636;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.5;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
[hidden] { display: none !important; }

#app { position: relative; height: 100%; overflow: hidden; }
#scene { position: absolute; inset: 0; z-index: 0; isolation: isolate; }
#scene canvas { display: block; touch-action: none; }
.label-layer { position: absolute; inset: 0; pointer-events: none; }

.panel {
  position: absolute;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 2;
}

/* ───── sidebar ───── */
#sidebar {
  top: max(var(--gap), env(safe-area-inset-top, 0px));
  left: max(var(--gap), env(safe-area-inset-left, 0px));
  bottom: max(var(--gap), env(safe-area-inset-bottom, 0px));
  width: 340px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px 12px;
  border-bottom: 1px solid var(--line);
}
.brand h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-2);
  letter-spacing: 0.02em;
  line-height: 1.1;
  text-wrap: balance;
}
.brand p { margin: 2px 0 0; color: var(--muted); font-size: var(--step--1); }
#list-toggle { display: none; }

.finder {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px 18px 14px;
  min-height: 0;
  flex: 1;
}
.search {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel-solid);
}
.search:focus-within { border-color: var(--focus); }
.search svg { width: 18px; height: 18px; fill: none; stroke: var(--muted); stroke-width: 1.8; flex: none; }
.search input {
  flex: 1;
  min-width: 0;
  border: 0;
  background: transparent;
  padding: 10px 0;
  font: inherit;
  color: var(--ink);
  outline: none;
}
.search kbd {
  font-family: var(--font-display);
  font-size: 11px;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0 6px;
}

.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 999px;
  padding: 3px 11px;
  font-size: var(--step--1);
  cursor: pointer;
}
.chip i { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.chip:hover { background: var(--hover); }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--panel-solid); border-color: var(--ink); }
#zone-chips .chip { font-family: var(--font-display); font-weight: 600; }

.count { margin: 2px 0 0; font-size: var(--step--1); color: var(--muted); font-variant-numeric: tabular-nums; }
.list {
  list-style: none;
  margin: 0 -8px;
  padding: 0;
  overflow-y: auto;
  flex: 1;
  min-height: 0;
}
.list .group {
  position: sticky;
  top: 0;
  background: var(--panel-solid);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step--1);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 8px 8px 4px;
  z-index: 1;
}
.item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  text-align: left;
  border: 0;
  background: transparent;
  border-radius: 10px;
  padding: 7px 8px;
  cursor: pointer;
}
.item:hover { background: var(--hover); }
.item[aria-current="true"] { background: var(--hover); box-shadow: inset 0 0 0 1.5px var(--accent); }
.item .names { display: flex; flex-direction: column; min-width: 0; flex: 1; }
.item .th { font-weight: 500; line-height: 1.35; }
.item .en { font-size: var(--step--1); color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.item .dot { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.empty { color: var(--muted); padding: 8px; margin: 0; }
.note { margin: 0; font-size: 12px; color: var(--muted); line-height: 1.45; }

.num {
  flex: none;
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-ink);
  border: 1.5px solid var(--accent-ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}
.num.big { width: 40px; height: 40px; font-size: 17px; }

/* ───── info card ───── */
#info {
  top: max(var(--gap), env(safe-area-inset-top, 0px));
  right: max(var(--gap), env(safe-area-inset-right, 0px));
  width: 360px;
  max-height: calc(100% - 260px);
  overflow-y: auto;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.info-head { display: flex; align-items: flex-start; gap: 12px; }
.info-title { flex: 1; min-width: 0; }
.info-title h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 700;
  line-height: 1.3;
  text-wrap: balance;
}
.info-title .en { margin: 2px 0 0; color: var(--muted); font-size: var(--step--1); }
.icon-btn {
  border: 0;
  background: transparent;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  cursor: pointer;
  color: var(--muted);
  flex: none;
}
.icon-btn:hover { background: var(--hover); color: var(--ink); }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--hover);
  color: var(--muted);
}
.tag i { width: 8px; height: 8px; border-radius: 50%; }
.tag.mono { font-family: var(--font-display); letter-spacing: 0.04em; }
.desc { margin: 0; line-height: 1.65; }
.source-note {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
  padding-left: 10px;
  border-left: 2px solid var(--accent);
}
.north { color: var(--ink); font-weight: 600; }
.also h3 {
  margin: 0 0 4px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-family: var(--font-display);
}
.also ul { margin: 0; padding-left: 18px; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; }

.btn {
  border: 1px solid var(--line);
  background: var(--panel-solid);
  border-radius: 10px;
  padding: 8px 14px;
  cursor: pointer;
  font-weight: 500;
  font-size: var(--step--1);
  overflow-wrap: anywhere;
}
.btn:hover { background: var(--hover); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.05); }
.btn.small { padding: 5px 12px; }

/* ───── dock ───── */
#dock {
  position: absolute;
  left: calc(340px + var(--gap) * 2);
  right: calc(300px + var(--gap) * 2);
  bottom: max(var(--gap), env(safe-area-inset-bottom, 0px));
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 2;
  pointer-events: none;
}
#toolbar {
  position: static;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 5px;
  pointer-events: auto;
  max-width: 100%;
  overflow-x: auto;
}
.seg { display: flex; gap: 2px; padding: 2px; background: var(--hover); border-radius: 10px; }
.tool {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 0;
  background: transparent;
  border-radius: 9px;
  padding: 7px 12px;
  cursor: pointer;
  white-space: nowrap;
  font-size: var(--step--1);
  font-weight: 500;
}
.tool svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.tool:hover { background: var(--hover); }
.seg .tool[aria-pressed="true"] { background: var(--panel-solid); box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15); }
#toggle-night[aria-pressed="true"], #toggle-labels[aria-pressed="true"] { color: var(--ink); }
#toggle-labels[aria-pressed="false"] { color: var(--muted); }
#toggle-labels[aria-pressed="false"] svg { opacity: 0.5; }
.hint {
  margin: 0;
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(23, 24, 28, 0.62);
  color: #ffffff;
  text-align: center;
  max-width: 100%;
}

/* ───── minimap ───── */
#minimap-wrap {
  right: max(var(--gap), env(safe-area-inset-right, 0px));
  bottom: max(var(--gap), env(safe-area-inset-bottom, 0px));
  width: 300px;
  padding: 10px 12px 12px;
}
.mini-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--step--1);
  margin-bottom: 6px;
}
.mini-sub { font-family: var(--font-body); font-weight: 400; font-size: 11px; color: var(--muted); }
#minimap { display: block; width: 100%; border-radius: 8px; cursor: crosshair; }

/* ───── 3D labels ───── */
.label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px 3px 3px;
  border-radius: 999px;
  border: 1px solid rgba(23, 24, 28, 0.15);
  background: rgba(255, 255, 255, 0.94);
  color: #17181c;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 12.5px;
  white-space: nowrap;
  cursor: pointer;
  pointer-events: auto;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.18);
  transition: transform 0.15s ease;
}
.label .num { width: 22px; height: 22px; font-size: 11px; border-color: #17181c; background: #f5b335; color: #17181c; }
.label:hover { transform: scale(1.06); z-index: 5; }
.label.compact { padding: 3px; }
.label.compact .txt { display: none; }
.label.active { background: #17181c; color: #ffffff; z-index: 10; transform: scale(1.1); }
.zone-tag {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 26px;
  letter-spacing: 0.08em;
  color: var(--zone-ink);
  text-shadow: 0 0 6px var(--zone-halo), 0 0 2px var(--zone-halo);
  pointer-events: none;
  user-select: none;
}
body.night .zone-tag { color: rgba(255, 255, 255, 0.75); text-shadow: 0 0 8px rgba(0, 0, 0, 0.6); }
.road-tag {
  font-weight: 600;
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 6px;
  background: #2f7d4f;
  color: #ffffff;
  pointer-events: none;
}

/* ───── walk HUD ───── */
#walk-hud { position: absolute; inset: 0; pointer-events: none; z-index: 1; }
.crosshair {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 14px;
  height: 14px;
  margin: -7px 0 0 -7px;
  border: 2px solid rgba(255, 255, 255, 0.85);
  border-radius: 50%;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.3);
}
.pad {
  display: none;
  position: absolute;
  right: max(var(--gap), env(safe-area-inset-right, 0px));
  bottom: calc(max(var(--gap), env(safe-area-inset-bottom, 0px)) + 76px);
  grid-template-columns: repeat(3, 52px);
  grid-template-rows: repeat(3, 52px);
  gap: 6px;
  pointer-events: auto;
}
.pad button {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 12px;
  font-size: 18px;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}
.pad button:active { background: var(--accent); color: var(--accent-ink); }
.pad-up { grid-area: 1 / 2; }
.pad-left { grid-area: 2 / 1; }
.pad-run { grid-area: 2 / 2; font-size: 13px !important; font-weight: 600; }
.pad-right { grid-area: 2 / 3; }
.pad-down { grid-area: 3 / 2; }
@media (pointer: coarse) {
  .pad { display: grid; }
}

#loading {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: var(--bg);
  color: var(--muted);
  font-family: var(--font-display);
  font-size: var(--step-1);
  z-index: 10;
  padding: 24px;
  text-align: center;
}

/* ───── medium screens: drop the minimap from the corner so the dock has room ───── */
@media (max-width: 1100px) {
  #dock { right: var(--gap); }
  #minimap-wrap { display: none; }
}

/* ───── phones ───── */
@media (max-width: 760px) {
  :root { --gap: 10px; }
  #sidebar {
    left: max(var(--gap), env(safe-area-inset-left, 0px));
    right: max(var(--gap), env(safe-area-inset-right, 0px));
    width: auto;
    bottom: auto;
    max-height: calc(100% - 120px);
  }
  .brand { padding: 10px 12px; border-bottom: 0; }
  .brand h1 { font-size: var(--step-1); }
  #list-toggle { display: inline-flex; }
  .finder { display: none; padding: 0 12px 12px; }
  body.list-open .finder { display: flex; }
  body.list-open .brand { border-bottom: 1px solid var(--line); }
  body.list-open #list-toggle { background: var(--ink); color: var(--panel-solid); }
  #info {
    top: auto;
    left: max(var(--gap), env(safe-area-inset-left, 0px));
    right: max(var(--gap), env(safe-area-inset-right, 0px));
    bottom: calc(max(var(--gap), env(safe-area-inset-bottom, 0px)) + 64px);
    width: auto;
    max-height: 36%;
    padding: 14px;
  }
  body.list-open #info { display: none; }
  #dock { left: var(--gap); right: var(--gap); }
  .hint { display: none; }
  .tool { padding: 7px 9px; }
  #toggle-night .txt, #toggle-labels .txt, #reset-view .txt {
    position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
  }
  .zone-tag { font-size: 18px; }
  body.walking #info { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .label { transition: none; }
}