/* ============ 侧栏面板（规则 / 学生） ============ */
.panel-head {
  padding: 14px 16px 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  gap: 8px;
}
.panel-head h3 { font-size: 14px; font-weight: 600; display: flex; align-items: center; gap: 7px; white-space: nowrap; }
.panel-body { flex: 1; overflow-y: auto; padding: 14px 14px 16px; min-height: 0; }
.panel-foot {
  padding: 12px 14px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

/* ---- 规则面板 ---- */
.rule-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 12px;
  margin-bottom: 10px;
  background: var(--bg-panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: box-shadow .15s, border-color .15s;
}
.rule-item.rule-off { opacity: .55; }
.rule-item.dragging { opacity: .4; border-style: dashed; }
.rule-item.drag-target { border-color: var(--primary); box-shadow: 0 0 0 2px var(--primary-soft); }

.rule-drag {
  cursor: grab;
  color: var(--text-3);
  font-size: 15px;
  letter-spacing: -2px;
  padding: 4px 2px;
  margin-left: -4px;
  flex-shrink: 0;
  border-radius: 4px;
  transition: color .15s, background .15s;
}
.rule-drag:hover { color: var(--primary); background: var(--primary-soft); }
.rule-drag:active { cursor: grabbing; }

.rule-main { flex: 1; min-width: 0; }
.rule-name { font-weight: 600; font-size: 13px; display: flex; align-items: center; gap: 7px; }
.rule-name .r-w { color: var(--primary); font-size: 11.5px; font-weight: 500; font-variant-numeric: tabular-nums; }
.rule-desc { font-size: 11px; color: var(--text-3); margin: 3px 0 8px; line-height: 1.5; }

.rule-slider { display: flex; align-items: center; gap: 8px; }
.rule-slider input[type="range"] { flex: 1; height: 4px; accent-color: var(--primary); cursor: pointer; }
.rule-slider .rv { width: 28px; text-align: right; font-size: 11.5px; color: var(--text-2); font-variant-numeric: tabular-nums; }

/* 开关 */
.switch { position: relative; width: 34px; height: 19px; flex-shrink: 0; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch .sl {
  position: absolute; inset: 0;
  background: var(--border-strong);
  border-radius: 10px;
  transition: background .15s;
  cursor: pointer;
}
.switch .sl::before {
  content: '';
  position: absolute;
  width: 15px; height: 15px;
  border-radius: 50%;
  background: #fff;
  top: 2px; left: 2px;
  transition: transform .15s;
  box-shadow: 0 1px 2px rgba(0,0,0,.25);
}
.switch input:checked + .sl { background: var(--primary); }
.switch input:checked + .sl::before { transform: translateX(15px); }

/* 滑块行（前排比例等） */
.slider-row {
  padding: 10px 4px 2px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 12.5px;
  color: var(--text-2);
}
.slider-row .slider-line { display: flex; align-items: center; gap: 8px; }
.slider-row input[type="range"] { flex: 1; accent-color: var(--primary); cursor: pointer; }
.slider-row .sv { font-variant-numeric: tabular-nums; color: var(--primary); font-weight: 600; }

.panel-section { margin-bottom: 18px; }
.panel-section:last-child { margin-bottom: 4px; }
.panel-section h4 {
  font-size: 12px;
  color: var(--text-3);
  font-weight: 600;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ---- 学生面板 ---- */
.search-box { position: relative; margin-bottom: 10px; }
.search-box input {
  width: 100%;
  padding: 8px 10px 8px 30px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-panel-2);
  outline: none;
}
.search-box input:focus { border-color: var(--primary); }
.search-box::before {
  content: '🔍';
  position: absolute;
  left: 9px; top: 50%;
  transform: translateY(-50%);
  font-size: 11px;
  opacity: .55;
}

.filter-tabs { display: flex; gap: 6px; margin-bottom: 10px; flex-wrap: wrap; }
.filter-tab {
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 12px;
  color: var(--text-2);
  background: var(--bg-panel-2);
  border: 1px solid var(--border);
  transition: all .15s;
}
.filter-tab:hover { border-color: var(--primary); color: var(--primary); }
.filter-tab.active { background: var(--primary); border-color: var(--primary); color: #fff; }

.student-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 11px;
  margin-bottom: 10px;
  background: var(--bg-panel-2);
  border: 1px solid var(--border);
  border-left-width: 3px;
  border-radius: var(--radius-sm);
  cursor: grab;
  transition: border-color .15s, box-shadow .15s;
}
.student-item:hover { border-color: var(--border-strong); box-shadow: var(--shadow); }
.student-item.seated { opacity: .62; }
.student-item.si-m { border-left-color: var(--male); }
.student-item.si-f { border-left-color: var(--female); }
.student-item.anno-red    { border-left-color: var(--anno-red); }
.student-item.anno-orange { border-left-color: var(--anno-orange); }
.student-item.anno-yellow { border-left-color: var(--anno-yellow); }
.student-item.anno-green  { border-left-color: var(--anno-green); }
.student-item.anno-purple { border-left-color: var(--anno-purple); }

.si-avatar {
  width: 28px; height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  flex-shrink: 0;
  color: #fff;
}
.si-avatar.a-m { background: var(--male); }
.si-avatar.a-f { background: var(--female); }

.si-main { flex: 1; min-width: 0; }
.si-name {
  font-size: 12.5px;
  display: flex;
  gap: 5px;
  align-items: center;
  white-space: nowrap;
  flex-wrap: nowrap;
  min-width: 0;
}
.si-nm { font-weight: 600; flex-shrink: 0; }
.si-attrs { font-size: 11px; color: var(--text-3); margin-top: 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.si-tag {
  font-size: 9.5px;
  line-height: 1.5;
  padding: 0 5px;
  border-radius: 7px;
  background: var(--primary-soft);
  color: var(--primary);
  flex-shrink: 0;
}
.si-seat {
  margin-left: auto;
  padding-left: 6px;
  font-size: 10px;
  color: var(--text-3);
  font-weight: 400;
  flex-shrink: 0;
}

.si-del {
  color: var(--text-3);
  font-size: 13px;
  padding: 4px 6px;
  border-radius: 4px;
  flex-shrink: 0;
}
.si-del:hover { color: var(--danger); background: var(--danger-soft); }

.empty-tip {
  text-align: center;
  color: var(--text-3);
  font-size: 12.5px;
  padding: 28px 12px;
  line-height: 1.9;
}