/* eXplane — online whiteboard (Study'N Fun) */
:root {
  --xp-bg: #00000F;
  --xp-panel: #10131d;
  --xp-border: rgba(110, 193, 255, .28);
  --xp-accent: #6EC1FF;
  --xp-text: #dfe7f3;
  --xp-muted: #8a96a8;
  --xp-btn: 36px;
}

* { box-sizing: border-box; }

html, body { height: 100%; margin: 0; }

body {
  background: var(--xp-bg);
  color: var(--xp-text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
  overscroll-behavior: none;
}

.xp-app {
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* ---- toolbar ---- */
.xp-bar {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 8px;
  background: var(--xp-panel);
  border-bottom: 1px solid var(--xp-border);
  overflow-x: auto;
  scrollbar-width: thin;
  touch-action: manipulation;
}

.xp-group {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 6px;
  border-left: 1px solid rgba(255, 255, 255, .08);
}

.xp-brand {
  flex: 0 0 auto;
  padding: 0 8px 0 4px;
  font-weight: 700;
  letter-spacing: .5px;
  white-space: nowrap;
}
.xp-brand b { color: var(--xp-accent); }

.xp-btn {
  flex: 0 0 auto;
  width: var(--xp-btn);
  height: var(--xp-btn);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--xp-text);
  font: inherit;
  text-decoration: none;
  cursor: pointer;
}
.xp-btn svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.xp-btn:hover { background: rgba(255, 255, 255, .06); }
.xp-btn:focus-visible, .xp-swatch:focus-visible { outline: 2px solid var(--xp-accent); outline-offset: 1px; }
.xp-btn.is-active {
  border-color: var(--xp-accent);
  background: rgba(110, 193, 255, .12);
  color: var(--xp-accent);
}
.xp-btn:disabled { opacity: .35; cursor: default; background: transparent; }

.xp-zoom-label {
  width: auto;
  min-width: 54px;
  padding: 0 6px;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

/* ---- colors ---- */
.xp-swatch {
  flex: 0 0 auto;
  display: inline-flex;
  width: 24px;
  height: 24px;
  padding: 0;
  border: 2px solid rgba(255, 255, 255, .25);
  border-radius: 50%;
  background: var(--sw, #fff);
  cursor: pointer;
}
.xp-swatch.is-active {
  border-color: var(--xp-panel);
  box-shadow: 0 0 0 2px var(--xp-accent);
}
.xp-custom { background: conic-gradient(#ff5c5c, #ffd93d, #4ade80, #4dabf7, #b197fc, #ff5c5c); }
.xp-custom input {
  width: 100%;
  height: 100%;
  padding: 0;
  border: 0;
  opacity: 0;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

/* ---- size ---- */
.xp-size input { width: 90px; accent-color: var(--xp-accent); }
.xp-size output {
  min-width: 2ch;
  color: var(--xp-muted);
  font-size: 12px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ---- board background chips ---- */
.xp-bgdot {
  width: 18px;
  height: 18px;
  border: 1px solid rgba(255, 255, 255, .35);
  border-radius: 4px;
}
[data-bg="dark"] .xp-bgdot { background: #12151f; }
[data-bg="light"] .xp-bgdot { background: #f7f7f2; }
[data-bg="chalk"] .xp-bgdot { background: #1d3a2c; }

/* ---- stage ---- */
.xp-stage {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr);
  overflow: hidden;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  cursor: crosshair;
}
.xp-canvas {
  grid-area: 1 / 1;
  display: block;
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  pointer-events: none;
}
.xp-stage[data-tool="eraser"], .xp-stage[data-tool="laser"] { cursor: none; }
.xp-stage[data-tool="select"] { cursor: default; }
.xp-stage[data-tool="text"] { cursor: text; }
.xp-stage[data-tool="pan"], .xp-stage.is-space { cursor: grab; }
.xp-stage.is-panning { cursor: grabbing; }

/* ---- context bar (tool options) ---- */
.xp-sub {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 4px;
  min-height: 44px;
  padding: 4px 8px;
  background: #0c0f17;
  border-bottom: 1px solid rgba(255, 255, 255, .06);
  overflow-x: auto;
  scrollbar-width: thin;
  touch-action: manipulation;
}
.xp-sub[hidden], .xp-sub [hidden] { display: none; }
.xp-sub .xp-group:first-of-type { border-left: 0; }

.xp-lbl {
  flex: 0 0 auto;
  padding: 0 4px;
  color: var(--xp-muted);
  font-size: 12px;
  white-space: nowrap;
}

.xp-chip {
  flex: 0 0 auto;
  height: 30px;
  min-width: 34px;
  padding: 0 10px;
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 15px;
  background: transparent;
  color: var(--xp-text);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}
.xp-chip:hover { background: rgba(255, 255, 255, .06); }
.xp-chip:focus-visible { outline: 2px solid var(--xp-accent); outline-offset: 1px; }
.xp-chip.is-active {
  border-color: var(--xp-accent);
  background: rgba(110, 193, 255, .12);
  color: var(--xp-accent);
}
.xp-chip-icon {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.xp-chip-icon svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.xp-chip-primary { border-color: var(--xp-accent); color: var(--xp-accent); }
.xp-chip-danger { border-color: rgba(255, 92, 92, .5); color: #ff8a8a; }

.xp-input {
  flex: 0 1 auto;
  width: 220px;
  height: 30px;
  padding: 0 10px;
  border: 1px solid rgba(255, 255, 255, .16);
  border-radius: 8px;
  background: rgba(255, 255, 255, .04);
  color: var(--xp-text);
  font: inherit;
  font-size: 13px;
}
.xp-input:focus { outline: none; border-color: var(--xp-accent); }
.xp-linkform #xpLinkTitle { width: 160px; }

.xp-spacer { flex: 1 1 auto; min-width: 8px; }
.xp-hint { flex: 0 1 auto; min-width: 0; overflow: hidden; text-overflow: ellipsis; }
.xp-pagelabel {
  flex: 0 0 auto;
  min-width: 52px;
  color: var(--xp-text);
  font-size: 12px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

/* ---- status ---- */
.xp-status {
  flex: 0 0 auto;
  margin: 0 0 0 auto;
  padding: 0 8px;
  color: #ffcb6b;
  font-size: 12px;
  white-space: nowrap;
}
.xp-status[hidden] { display: none; }

/* ---- inline text editor layer ----
   Exception to the no-absolute rule (agreed): an editor must sit exactly over its
   board object, whose position comes from the camera. Only this layer uses it. */
.xp-overlay {
  grid-area: 1 / 1;
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  pointer-events: none;
}
.xp-textedit {
  position: absolute;
  margin: 0;
  border: 0;
  outline: 1.5px dashed var(--xp-accent);
  outline-offset: 2px;
  resize: none;
  overflow: hidden;
  white-space: pre-wrap;
  overflow-wrap: break-word;
  pointer-events: auto;
  user-select: text;
  -webkit-user-select: text;
}

@media (max-width: 767px) {
  :root { --xp-btn: 40px; }
  .xp-brand { display: none; }
  .xp-size input { width: 70px; }
}

/* ---- presentation mode ---- */
.xp-btn-present { color: var(--xp-accent); }
.xp-pbar {
  flex: 0 0 auto;
  display: none;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  background: rgba(16, 19, 29, .92);
  border-top: 1px solid rgba(255, 255, 255, .06);
  overflow-x: auto;
  scrollbar-width: none;
  touch-action: manipulation;
}
.xp-pbar .xp-group:first-child { border-left: 0; }
.xp-app.is-presenting .xp-bar,
.xp-app.is-presenting .xp-sub,
.xp-app.is-presenting .xp-filebar { display: none; }

/* ---- file bar (opens in the flow, above the options bar) ---- */
.xp-filebar {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 4px;
  min-height: 44px;
  padding: 4px 8px;
  background: #151a27;
  border-bottom: 1px solid var(--xp-border);
  overflow-x: auto;
  scrollbar-width: thin;
  touch-action: manipulation;
}
.xp-filebar[hidden] { display: none; }
.xp-filebar .xp-group:first-child { border-left: 0; }
.xp-title { width: 240px; font-weight: 600; }
#xpFileBtn[aria-expanded="true"] {
  border-color: var(--xp-accent);
  background: rgba(110, 193, 255, .12);
  color: var(--xp-accent);
}
.xp-chip:disabled { opacity: .45; cursor: default; }
.xp-app.is-presenting .xp-pbar { display: flex; }

/* ---- online boards ---- */
.xp-cloudstate { max-width: 260px; overflow: hidden; text-overflow: ellipsis; }
.xp-cloudstate.is-ok { color: #7be495; }
.xp-cloudstate.is-warn { color: #ffcb6b; }
.xp-linkbox { width: 300px; }
.xp-linkbox[hidden] { display: none; }
.xp-chip-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.xp-boards {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  max-height: 40vh;
  background: #111522;
  border-bottom: 1px solid var(--xp-border);
}
.xp-boards[hidden] { display: none; }
.xp-boards-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 8px 4px 14px;
}
.xp-boards-list {
  margin: 0;
  padding: 0 8px 8px;
  list-style: none;
  overflow-y: auto;
}
.xp-board-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px 10px;
  padding: 8px 6px;
  border-top: 1px solid rgba(255, 255, 255, .06);
}
.xp-board-name {
  flex: 1 1 220px;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 600;
}
.xp-board-meta { color: var(--xp-muted); font-size: 12px; white-space: nowrap; }
.xp-board-empty { padding: 10px 6px; color: var(--xp-muted); font-size: 13px; }

/* ---- live viewer mode ---- */
.xp-viewer-only { display: none; }
.xp-app.is-viewer .xp-viewer-only { display: flex; }
.xp-app.is-viewer .xp-edit-only { display: none !important; }
.xp-live {
  flex: 0 0 auto;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(255, 92, 92, .16);
  color: #ff8a8a;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .6px;
}
.xp-live.is-stale { background: rgba(255, 203, 107, .14); color: #ffcb6b; }
.xp-viewer-title { max-width: 320px; overflow: hidden; text-overflow: ellipsis; color: var(--xp-text); font-size: 13px; }