/* ===========================================================
   培森题库 · 题库白板（白板 / 几何画板 / 思维导图）
   =========================================================== */
body.board-page {
  height: 100vh; overflow: hidden; display: flex; flex-direction: column;
  background: #eef3f4;
}

.btop {
  height: 56px; flex-shrink: 0; display: flex; align-items: center; gap: 12px;
  padding: 0 16px; background: #fff; border-bottom: 1px solid var(--line); z-index: 20;
}
.btop .brand img { height: 28px; width: 28px; }
.btop .brand b { font-size: 15px; }
.btop .sep { width: 1px; height: 22px; background: var(--line-2); }
.btop .grow { flex: 1; }

.mode-tabs { display: flex; gap: 2px; background: #f4f9f9; padding: 3px; border-radius: 10px; }
.mode-tabs button {
  height: 30px; padding: 0 14px; border: none; background: transparent; border-radius: 8px;
  font-size: 13.5px; color: var(--ink-2); cursor: pointer; transition: .15s;
  display: inline-flex; align-items: center; gap: 6px;
}
.mode-tabs button svg { width: 14px; height: 14px; }
.mode-tabs button.on { background: #fff; color: var(--ink); font-weight: 600; box-shadow: 0 1px 3px rgba(19,46,51,.08); }

.bwrap { flex: 1; display: flex; min-height: 0; }

/* 左工具栏 */
.brail {
  width: 56px; flex-shrink: 0; background: #fff; border-right: 1px solid var(--line);
  padding: 10px 0; display: flex; flex-direction: column; align-items: center; gap: 4px;
  overflow-y: auto;
}
.tool {
  width: 40px; height: 40px; border-radius: 10px; border: none; background: transparent;
  color: var(--ink-2); cursor: pointer; display: grid; place-items: center; position: relative;
  transition: .14s;
}
.tool:hover { background: #f2f8f8; color: var(--ink); }
.tool.on { background: var(--pri-l); color: var(--pri-dd); }
.tool svg { width: 19px; height: 19px; }
.tool[data-tip]:hover::after {
  content: attr(data-tip);
  position: absolute; left: 48px; top: 50%; transform: translateY(-50%);
  background: #16242c; color: #fff; font-size: 12px; padding: 4px 9px; border-radius: 6px;
  white-space: nowrap; z-index: 30;
}
.rail-sep { width: 22px; height: 1px; background: var(--line); margin: 6px 0; }

/* 画布区 */
.bcanvas { flex: 1; min-width: 0; position: relative; overflow: hidden; }
#cv { display: block; cursor: crosshair; touch-action: none; }
#cv.cursor-move { cursor: move; }
#cv.cursor-text { cursor: text; }
#cv.cursor-default { cursor: default; }

/* 底部翻页条（白板） */
.bpages {
  position: absolute; left: 50%; bottom: 14px; transform: translateX(-50%);
  background: rgba(255,255,255,.96); border: 1px solid var(--line); border-radius: 12px;
  box-shadow: var(--sh-m); padding: 6px 10px; display: none; align-items: center; gap: 6px;
  backdrop-filter: blur(6px);
}
.bpages.show { display: flex; }
.bpages .pg {
  min-width: 28px; height: 28px; border-radius: 7px; border: 1px solid var(--line);
  background: #fff; font-size: 12.5px; color: var(--ink-2); cursor: pointer;
}
.bpages .pg.on { background: var(--pri); border-color: var(--pri); color: #fff; font-weight: 600; }
.bpages .btn-sm { height: 28px; }

/* 右侧属性栏 */
.binsp {
  width: 216px; flex-shrink: 0; background: #fff; border-left: 1px solid var(--line);
  padding: 14px; overflow-y: auto;
}
.binsp h5 {
  font-size: 11.5px; color: var(--muted); font-weight: 600; letter-spacing: .8px;
  margin: 0 0 8px; text-transform: uppercase;
}
.binsp .grp { margin-bottom: 18px; }
.binsp .grp:last-child { margin-bottom: 0; }

.swatches { display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px; }
.sw {
  width: 100%; aspect-ratio: 1; border-radius: 7px; cursor: pointer; border: 2px solid transparent;
  position: relative;
}
.sw:hover { transform: scale(1.06); }
.sw.on { border-color: var(--pri); box-shadow: 0 0 0 2px rgba(16,179,163,.18); }

.wrow { display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--ink-2); }
.wrow input[type=range] { flex: 1; accent-color: var(--pri); }
.wrow b { font-family: var(--mono); font-size: 11.5px; width: 26px; text-align: right; }

.binsp .field { margin-bottom: 10px; }
.binsp .field label { font-size: 12px; color: var(--ink-2); display: block; margin-bottom: 4px; }
.binsp .field .input, .binsp .field .select { height: 32px; font-size: 13px; padding: 0 9px; }

.chip-row { display: flex; gap: 5px; flex-wrap: wrap; }
.chip {
  height: 26px; padding: 0 10px; border-radius: 7px; border: 1px solid var(--line-2);
  background: #fff; font-size: 12px; color: var(--ink-2); cursor: pointer;
}
.chip.on { background: var(--pri-l); border-color: #bfe9e4; color: var(--pri-dd); font-weight: 600; }

.hint-box {
  font-size: 11.5px; color: var(--muted); line-height: 1.75;
  background: #f8fbfb; border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px;
}
.hint-box b { color: var(--ink-2); }

/* 思维导图编辑浮层 */
.mm-edit {
  position: absolute; z-index: 25; background: #fff; border: 2px solid var(--pri);
  border-radius: 8px; box-shadow: var(--sh-m); padding: 2px;
}
.mm-edit textarea {
  border: none; outline: none; resize: none; font-family: var(--font);
  font-size: 14px; line-height: 1.4; padding: 4px 6px; min-width: 140px;
  min-height: 30px; display: block;
}

/* 空状态提示 */
.canvas-tip {
  position: absolute; left: 50%; top: 22px; transform: translateX(-50%);
  background: rgba(22,36,44,.82); color: #fff; font-size: 12.5px; padding: 6px 14px;
  border-radius: 8px; pointer-events: none; opacity: 0; transition: .25s;
}
.canvas-tip.show { opacity: 1; }

@media (max-width: 980px) {
  .binsp { display: none; }
  .mode-tabs button span { display: none; }
}

@media (max-width: 700px) {
  .btop {
    height: auto; flex-wrap: wrap; padding: 8px; row-gap: 6px; gap: 6px;
  }
  .btop .brand b { font-size: 14px; }
  .btop .sep, .btop .grow { display: none; }
  .btop .btn { padding: 0 10px; }
  .btop .brand img { height: 26px; width: 26px; }
  .brail { width: 48px; }
  .tool { width: 36px; height: 36px; }
  .tool[data-tip]:hover::after { display: none; }
}