/* ============================================================
   多功能画板工具样式
   基于新站设计系统 CSS 变量，适配深浅色模式与移动端
   ============================================================ */
.paintboard-container {
  position: relative;
  height: calc(100vh - 250px);
  min-height: 480px;
  background: var(--bg2);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  overflow: hidden;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
.paintboard-canvas {
  position: absolute;
  inset: 0;
  cursor: crosshair;
  display: block;
}

/* ============ 面板开关按钮 ============ */
.panel-toggle-btn {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 1001;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: 0 4px 12px rgba(66, 185, 131, .3);
  transition: all .3s ease;
}
.panel-toggle-btn:hover { transform: scale(1.1); }
.panel-toggle-btn .toggle-icon { font-size: 1.2rem; }

/* ============ 左侧工具面板 ============ */
.tool-panel {
  position: absolute;
  top: 64px;
  left: 14px;
  z-index: 1000;
  width: 280px;
  max-height: calc(100% - 110px);
  overflow-y: auto;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  box-shadow: 0 4px 20px rgba(0, 0, 0, .15);
  padding: 16px;
}
.tool-panel::-webkit-scrollbar { width: 6px; }
.tool-panel::-webkit-scrollbar-thumb { background: var(--rule); border-radius: 3px; }

.tool-section {
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
}
.tool-section:last-child { border-bottom: none; margin-bottom: 0; }
.tool-section h3 {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 0 0 10px;
  font-size: .85rem;
  font-weight: 600;
  color: var(--ink);
}
.tool-section h3 i { color: var(--accent); }

/* 主工具按钮 */
.tool-buttons { display: flex; flex-wrap: wrap; gap: 8px; }
.tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 7px 11px;
  border: 1px solid var(--rule);
  background: var(--bg);
  color: var(--ink);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: .78rem;
  font-family: var(--font);
  transition: all .2s;
}
.tool-btn:hover { background: var(--bg2); border-color: var(--accent); }
.tool-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.tool-btn:disabled { opacity: .5; cursor: not-allowed; }

/* 画笔/形状子按钮 */
.brush-buttons, .shape-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}
.brush-buttons .tool-btn, .shape-buttons .tool-btn {
  justify-content: center;
  padding: 6px 4px;
  font-size: .72rem;
}

/* 图层操作按钮 */
.layer-buttons { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.layer-buttons .tool-btn { justify-content: center; padding: 7px 4px; font-size: .74rem; }

/* 颜色选择 */
.color-picker-container { display: flex; align-items: center; gap: 10px; }
.color-picker { width: 40px; height: 32px; border: 1px solid var(--rule); border-radius: var(--radius-sm); cursor: pointer; padding: 0; background: none; flex-shrink: 0; }
.color-picker::-webkit-color-swatch-wrapper { padding: 0; }
.color-picker::-webkit-color-swatch { border: none; border-radius: 4px; }
.preset-colors { display: grid; grid-template-columns: repeat(6, 1fr); gap: 5px; flex: 1; }
.preset-color {
  width: 22px;
  height: 22px;
  border-radius: 5px;
  cursor: pointer;
  transition: all .2s ease;
  border: 2px solid var(--rule);
}
.preset-color:hover { transform: scale(1.1); border-color: var(--accent); }
.preset-color.active { border-color: var(--accent); transform: scale(1.1); box-shadow: 0 0 0 2px var(--accent-soft); }
.color-item {
  width: 20px;
  height: 20px;
  border-radius: 5px;
  cursor: pointer;
  transition: all .2s ease;
  border: 2px solid var(--rule);
}
.color-item:hover { transform: scale(1.1); border-color: var(--accent); }
.color-item.active { border-color: var(--accent); transform: scale(1.1); box-shadow: 0 0 0 2px var(--accent-soft); }

/* 滑块 */
.slider-container { display: flex; align-items: center; gap: 10px; margin-top: 8px; }
.slider-container label { font-size: .78rem; color: var(--muted); min-width: 42px; }
.slider { flex: 1; height: 4px; border-radius: 2px; background: var(--rule); outline: none; cursor: pointer; accent-color: var(--accent); }
.slider-value { min-width: 34px; font-size: .75rem; color: var(--muted); text-align: right; }

/* 文字/图片设置通用项 */
.config-item { margin-bottom: 12px; }
.config-item:last-child { margin-bottom: 0; }
.config-item label { display: block; margin-bottom: 6px; font-size: .78rem; font-weight: 500; color: var(--muted); }
.pb-select, .pb-input {
  width: 100%;
  padding: 7px 10px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
  font-size: .82rem;
  background: var(--bg);
  color: var(--ink);
  box-sizing: border-box;
  outline: none;
}
.pb-select:focus, .pb-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.pb-input[type="number"] { width: 100%; }

/* 样式/对齐按钮 */
.style-buttons, .align-buttons { display: flex; gap: 6px; }
.style-btn, .align-btn {
  width: 34px;
  height: 32px;
  border: 1px solid var(--rule);
  background: var(--bg);
  color: var(--ink);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .9rem;
  transition: all .2s;
}
.style-btn:hover, .align-btn:hover { background: var(--bg2); border-color: var(--accent); }
.style-btn.active, .align-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* 滤镜 */
.filter-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin-bottom: 10px; }
.filter-checkbox-wrap {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: .72rem;
  color: var(--ink);
  cursor: pointer;
  padding: 5px 6px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
  background: var(--bg2);
  transition: all .2s;
}
.filter-checkbox-wrap:hover { border-color: var(--accent); }
.filter-checkbox-wrap input { width: 14px; height: 14px; accent-color: var(--accent); margin: 0; flex-shrink: 0; }

/* 帮助 */
.help-section { border-bottom: none !important; }
.help-toggle {
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  margin: 0;
}
.help-toggle span { display: inline-flex; align-items: center; gap: 6px; }
.help-arrow { font-size: .8rem; opacity: .5; transition: transform .2s; }
.help-toggle[aria-expanded="true"] .help-arrow { transform: rotate(180deg); }
.help-content { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.help-content.active { max-height: 500px; }
.help-item { display: flex; align-items: flex-start; gap: 8px; padding: 6px 0; font-size: .75rem; border-bottom: 1px solid var(--rule); }
.help-item:last-child { border-bottom: none; }
.help-key { min-width: 64px; font-weight: 600; color: var(--ink); flex-shrink: 0; display: inline-flex; align-items: center; gap: 4px; }
.help-key i { color: var(--accent); }
.help-desc { color: var(--muted); line-height: 1.4; }

/* ============ 底部工具栏 ============ */
.bottom-toolbar {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 50px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, .15);
  padding: 8px 16px;
  z-index: 1000;
  display: flex;
  gap: 10px;
  align-items: center;
}
.toolbar-btn {
  width: 38px;
  height: 38px;
  border: none;
  background: var(--bg2);
  color: var(--ink);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .2s;
  font-size: 1rem;
}
.toolbar-btn:hover { background: var(--accent-soft); color: var(--accent); transform: scale(1.1); }
.toolbar-btn.active { background: var(--accent); color: #fff; }
.toolbar-btn:disabled { opacity: .4; cursor: not-allowed; transform: none; }
.toolbar-download { background: var(--accent); color: #fff; }
.toolbar-download:hover { background: #37996d; color: #fff; }
.zoom-controls { display: flex; gap: 5px; align-items: center; }
.main-operations { display: flex; gap: 5px; }
.zoom-info {
  background: var(--bg2);
  color: var(--ink);
  padding: 5px 10px;
  border-radius: 15px;
  font-size: .75rem;
  cursor: pointer;
  transition: background .2s ease;
  min-width: 44px;
  text-align: center;
}
.zoom-info:hover { background: var(--accent-soft); color: var(--accent); }

/* ============ 画板设置面板 ============ */
.board-config-panel {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 30px rgba(0, 0, 0, .2);
  z-index: 1002;
  width: 460px;
  max-height: 85%;
  overflow-y: auto;
}
.config-header {
  background: var(--grad);
  color: #fff;
  padding: 14px 20px;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.config-header h3 { margin: 0; font-size: 1rem; display: flex; align-items: center; gap: 6px; }
.close-btn {
  background: none;
  border: none;
  color: #fff;
  font-size: 1.4rem;
  cursor: pointer;
  padding: 2px 8px;
  border-radius: 50%;
  transition: background .2s ease;
  line-height: 1;
}
.close-btn:hover { background: rgba(255, 255, 255, .2); }
.config-content { padding: 20px; }
.config-section { margin-bottom: 20px; padding-bottom: 18px; border-bottom: 1px solid var(--rule); }
.config-section:last-child { border-bottom: none; margin-bottom: 0; }
.config-section h4 { margin: 0 0 14px; color: var(--ink); font-size: .9rem; display: flex; align-items: center; gap: 6px; }
.config-section h4 i { color: var(--accent); }
.size-controls { display: flex; flex-direction: column; gap: 12px; }
.size-item { display: flex; align-items: center; gap: 10px; }
.size-item label { font-size: .8rem; color: var(--muted); min-width: 40px; }
.size-item input[type="number"] {
  width: 110px;
  padding: 8px 10px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--ink);
  font-size: .85rem;
  outline: none;
}
.size-item input[type="number"]:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.size-item span { font-size: .78rem; color: var(--muted); }
.color-opacity-control { display: flex; align-items: center; gap: 14px; }
.opacity-control { display: flex; align-items: center; gap: 8px; flex: 1; }
.opacity-control label { font-size: .78rem; color: var(--muted); white-space: nowrap; }
.opacity-control input[type="range"] { flex: 1; accent-color: var(--accent); }
.opacity-control span { font-size: .75rem; color: var(--muted); min-width: 36px; text-align: right; }
.color-picker-input { width: 40px; height: 32px; border: 2px solid var(--rule); border-radius: var(--radius-sm); cursor: pointer; padding: 0; background: none; flex-shrink: 0; }
.color-picker-input::-webkit-color-swatch-wrapper { padding: 0; }
.color-picker-input::-webkit-color-swatch { border: none; border-radius: 4px; }
.bg-image-ops { display: flex; gap: 8px; margin-bottom: 10px; }
.bg-image-opacity { margin-top: 4px; }
.config-checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: .82rem;
  color: var(--ink);
  margin-bottom: 10px;
}
.config-checkbox:last-child { margin-bottom: 0; }
.config-checkbox input { width: 16px; height: 16px; accent-color: var(--accent); }

/* ============ 响应式 ============ */
@media (max-width: 900px) {
  .paintboard-container { height: calc(100vh - 230px); min-height: 420px; }
  .tool-panel { top: 60px; left: 8px; right: 8px; width: auto; max-height: 46%; padding: 12px; }
  .panel-toggle-btn { top: 10px; left: 10px; width: 36px; height: 36px; }
  .brush-buttons, .shape-buttons { grid-template-columns: repeat(5, 1fr); }
  .bottom-toolbar { bottom: 8px; padding: 6px 10px; gap: 6px; max-width: calc(100% - 16px); }
  .toolbar-btn { width: 34px; height: 34px; font-size: .9rem; }
  .board-config-panel { width: calc(100% - 24px); max-height: 90%; }
  .filter-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 520px) {
  .brush-buttons, .shape-buttons { grid-template-columns: repeat(4, 1fr); }
  .bottom-toolbar { gap: 4px; }
  .toolbar-btn { width: 32px; height: 32px; }
  .zoom-info { min-width: 38px; padding: 4px 6px; }
}