/* 青越数理 · 手机端适配（≤640px 生效）
 * 由 nginx sub_filter 注入所有模型页，模型文件本体不动。
 * 目标：首屏瘦身、公式卡不撑破、Tab 紧凑、杜绝横向溢出。
 */
@media (max-width: 640px) {
  /* ---- 兜底：任何装饰层/超宽元素都不允许制造横向滚动 ---- */
  html, body { overflow-x: hidden; }
  body > .grid-overlay, body > .glow-blob, body > canvas#bg, #bg {
    max-width: 100vw !important;
  }

  /* ---- 首屏瘦身：标题区压缩，让互动区上移进首屏 ---- */
  .wrap { padding-left: 14px !important; padding-right: 14px !important; }
  header { padding: 24px 0 10px !important; }
  .badge {
    font-size: 11px !important; letter-spacing: 2px !important;
    padding: 4px 12px !important; margin-bottom: 10px !important;
  }
  h1 {
    font-size: clamp(24px, 7vw, 32px) !important;
    letter-spacing: 2px !important; line-height: 1.25 !important;
  }
  .sub {
    margin-top: 8px !important; font-size: 13px !important;
    letter-spacing: 0 !important; line-height: 1.6 !important;
  }

  /* ---- 公式卡：手机端自动换行，确保完整公式不丢失 ---- */
  .formula-chip {
    display: flex !important; flex-wrap: wrap !important;
    box-sizing: border-box; max-width: 100% !important;
    overflow-x: visible !important;
    white-space: normal;
    font-size: 15.5px !important; padding: 10px 14px !important;
    gap: 4px 8px !important; margin-top: 12px !important;
    line-height: 1.55 !important;
  }
  .formula-chip * { white-space: normal !important; }
  /* 居中占满整行，换行后仍整齐 */
  header .formula-chip { width: 100%; justify-content: center; }

  /* ---- 拖拽热区：禁止触摸滚动干扰拖动点，去掉点击高亮 ---- */
  svg.lab .qy-halo { touch-action: none; -webkit-tap-highlight-color: transparent; }

  /* ---- Tab：大胶囊 → 紧凑排列，优先一行，放不下自动换行，确保完整显示 ---- */
  nav {
    margin: 14px 0 12px !important; top: 6px !important;
    flex-wrap: wrap !important; justify-content: center !important;
    overflow-x: visible !important;
    padding: 4px 2px !important; gap: 8px !important;
  }
  .tab-btn {
    flex: 1 1 auto; min-width: 28%; max-width: 100%;
    padding: 9px 12px !important; min-height: 40px !important;
    font-size: 13px !important; letter-spacing: 0.5px !important;
    display: inline-flex; align-items: center; justify-content: center;
    text-align: center;
  }

  /* ---- 卡片与控件区 ---- */
  .card { padding: 14px !important; border-radius: 16px !important; }
  .stage-title { font-size: 15px !important; }
  .hint { font-size: 13px !important; line-height: 1.65 !important; }

  /* ---- SVG 实验区：限制高度并裁剪溢出，防止图形超出卡片黑色背景 ---- */
  svg.lab {
    min-height: 220px;
    max-height: 62vh;
    touch-action: none;
    overflow: hidden !important;
  }

  /* ---- 模型同源真题卡：手机端紧凑布局 ---- */
  .lab-exam { padding: 14px 14px 10px !important; margin-top: 12px !important; }
  .lab-exam .le-source {
    display: flex !important;
    flex-wrap: wrap !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: 6px 8px !important;
    margin-bottom: 10px !important;
    padding: 8px 10px !important;
  }
  .lab-exam .le-badge {
    order: 1;
    font-size: 11px !important; padding: 4px 10px !important; letter-spacing: 1px !important;
  }
  .lab-exam .le-stars {
    order: 2;
    margin-left: auto !important; font-size: 12px !important;
  }
  .lab-exam .le-source-main {
    order: 3; width: 100%;
    font-size: 12px !important; line-height: 1.5 !important; min-width: auto !important;
    word-break: keep-all;
  }
  .lab-exam .le-fignote {
    padding: 8px 10px !important; margin-bottom: 10px !important;
    font-size: 12.5px !important; line-height: 1.6 !important;
  }
  .lab-exam .le-body { font-size: 14.5px !important; line-height: 1.75 !important; }
  .lab-exam .le-input { gap: 6px !important; margin: 10px 0 0 !important; }
  .lab-exam .le-input input { min-width: 80px !important; padding: 8px 10px !important; font-size: 14px !important; }
  .lab-exam .le-status { min-width: auto !important; font-size: 13px !important; }
}