/* ▼ 自动生成,请勿手改本文件头 ▼
   css/03-panels.css  —— Left: Upload / Center: Result / 共享控件规则 / Right: Chat

   本文件由 scripts/split.mjs 从 public/index.html 切出。
   ⚠️ 加载顺序在 index.html 里固定,不要调整 ——
      CSS 级联与 JS 执行都吃顺序,换了位置就会出问题。
   ===== 文件头结束(以下为原样切出的内容) ===== */
  /* ===== Left: Upload ===== */
  /* 旋转渐变描边依赖可动画的自定义属性;不支持时退化为静态渐变,不影响可用性 */
  @property --angle {
    syntax: '<angle>';
    initial-value: 0deg;
    inherits: false;
  }
  @keyframes border-spin { to { --angle: 360deg; } }
  /* 悬停时图标的悬浮呼吸(把 scale 烘进关键帧,避免覆盖 hover 的放大态) */
  @keyframes icon-bob {
    0%, 100% { transform: scale(1.09) translateY(0); }
    50%      { transform: scale(1.09) translateY(-5px); }
  }

  .upload-zone {
    position: relative;
    isolation: isolate;
    border: 2px dashed rgba(148, 163, 184, .52);
    border-radius: var(--radius);
    padding: 28px 16px;
    text-align: center;
    cursor: pointer;
    transition: border-color var(--dur-slow) var(--ease-out),
                background var(--dur-slow) var(--ease-out),
                transform var(--dur-slow) var(--ease-spring),
                box-shadow var(--dur-slow) var(--ease-out);
    background: linear-gradient(135deg, rgba(255,255,255,.48), rgba(255,255,255,.22));
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
    box-shadow:
      inset 0 1px 1px rgba(255, 255, 255, .70),
      inset 0 0 20px rgba(255, 255, 255, .25);
  }
  /* 悬停时自顶部渗出的品牌色辉光(z-index:-1 保证压在文字之下) */
  .upload-zone::before {
    content: '';
    position: absolute; inset: 0;
    border-radius: inherit;
    background:
      radial-gradient(440px 240px at 50% -10%, rgba(var(--primary-rgb), .20), transparent 72%),
      radial-gradient(320px 200px at 50% 110%, rgba(var(--primary-2-rgb), .14), transparent 74%);
    opacity: 0;
    transition: opacity var(--dur-slow) var(--ease-out);
    pointer-events: none;
    z-index: -1;
  }
  /* 旋转的高亮渐变描边:conic-gradient + mask 挖空,只保留 2px 边框环 */
  .upload-zone::after {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: inherit;
    padding: 2px;
    background: conic-gradient(from var(--angle, 0deg),
      transparent 0%,
      rgba(var(--primary-rgb), .18) 10%,
      var(--primary) 24%,
      var(--primary-2) 42%,
      rgba(var(--primary-2-rgb), .18) 56%,
      transparent 70%,
      transparent 100%);
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--dur-slow) var(--ease-out);
    pointer-events: none;
    z-index: 2;
  }
  .upload-zone:hover,
  .upload-zone.dragover {
    border-color: transparent;
    background: linear-gradient(135deg, rgba(238,242,255,.66), rgba(245,243,255,.42));
    transform: translateY(-3px);
    box-shadow:
      0 2px 6px rgba(var(--primary-rgb), .10),
      0 10px 26px rgba(var(--primary-rgb), .16),
      0 22px 46px rgba(var(--primary-rgb), .10),
      inset 0 1px 1px rgba(255, 255, 255, .95),
      inset 0 0 30px rgba(255, 255, 255, .46);
  }
  .upload-zone:hover::before,
  .upload-zone.dragover::before { opacity: 1; }
  .upload-zone:hover::after,
  .upload-zone.dragover::after {
    opacity: 1;
    animation: border-spin 3.4s linear infinite;
  }
  .upload-zone:hover .upload-icon { animation: icon-bob 2.4s ease-in-out infinite; }
  .upload-icon {
    position: relative;
    isolation: isolate;
    width: 56px; height: 56px;
    margin: 0 auto 14px;
    background: var(--glass-tint-strong);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: 50%;
    border: 1px solid var(--glass-edge);
    display: flex; align-items: center; justify-content: center;
    color: var(--primary);
    box-shadow: var(--glass-refract);
    transition: transform .3s cubic-bezier(.4, 0, .2, 1), box-shadow .3s;
  }
  /* 液态扭曲外壳 */
  .upload-icon::before {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(199, 210, 254, .58), rgba(233, 213, 255, .46));
    filter: url(#liquid-edge);
    z-index: -1;
    opacity: .95;
    pointer-events: none;
  }
  .upload-zone:hover .upload-icon {
    transform: scale(1.09);
    box-shadow: var(--glass-refract-hover);
  }
  .upload-zone h4 {
    font-size: calc(14px * var(--font-scale, 1));
    font-weight: var(--fw-semibold);
    letter-spacing: var(--ls-tight);
    margin-bottom: 5px;
  }
  .upload-zone p {
    font-size: calc(12px * var(--font-scale, 1));
    font-weight: var(--fw-regular);
    color: var(--text-tertiary);
  }
  /* 「支持 PNG · JPG · PDF · 最大 10MB」胶囊 */
  .upload-zone .hint {
    margin-top: 12px;
    display: inline-flex; align-items: center; gap: 5px;
    padding: 5px 12px;
    background: var(--surface);
    border-radius: 999px;
    font-size: calc(11px * var(--font-scale, 1));
    font-weight: var(--fw-medium);
    letter-spacing: .12px;
    color: var(--text-tertiary);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-1);
    transition: color var(--dur) var(--ease-out),
                background var(--dur) var(--ease-out),
                border-color var(--dur) var(--ease-out),
                box-shadow var(--dur) var(--ease-out);
  }
  .upload-zone:hover .hint {
    color: var(--primary);
    border-color: rgba(199, 210, 254, .90);
    box-shadow: var(--shadow-2), 0 0 0 3px rgba(var(--primary-rgb), .07);
  }
  /* 「也可以直接 Ctrl+V 粘贴截图」——第二行提示,比胶囊更轻 */
  .upload-zone .hint-paste {
    margin-top: 7px;
    display: block;
    padding: 0;
    background: none;
    border: 0;
    box-shadow: none;
  }
  .upload-zone .hint-paste:hover { color: var(--text-tertiary); box-shadow: none; }
  .upload-zone kbd {
    font-family: inherit;
    font-size: .94em;
    font-weight: var(--fw-semibold);
    padding: 1px 5px;
    margin: 0 1px;
    border-radius: 5px;
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: inset 0 -1px 0 rgba(148, 163, 184, .34);
    color: var(--text-secondary);
  }
  /* 触屏设备上没有 Ctrl 键,这行提示只会让人困惑 */
  @media (hover: none) and (pointer: coarse) {
    .upload-zone .hint-paste { display: none; }
  }

  .file-list {
    margin-top: 16px;
    display: flex; flex-direction: column; gap: 8px;
  }
  .file-item {
    display: flex; align-items: center; gap: 12px;
    padding: 11px 13px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, rgba(255,255,255,.44), rgba(255,255,255,.24));
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
    border: 1px solid rgba(255, 255, 255, .50);
    box-shadow: var(--shadow-2), inset 0 1px 1px rgba(255, 255, 255, .78);
    transition: background var(--dur) var(--ease-out),
                border-color var(--dur) var(--ease-out),
                transform var(--dur) var(--ease-spring),
                padding var(--dur) var(--ease-spring),
                box-shadow var(--dur) var(--ease-out);
  }
  .file-item:hover {
    background: linear-gradient(135deg, rgba(255,255,255,.66), rgba(255,255,255,.38));
    border-color: rgba(255, 255, 255, .95);
    /* 同 .subject-option:用等宽 padding 互换做右移,避免撑出横向滚动区域
       (transform 保持给删除时的 translateX 滑出动画用) */
    padding-left: 16px;
    padding-right: 10px;
    box-shadow:
      0 2px 5px rgba(15, 23, 42, .05),
      0 6px 18px rgba(15, 23, 42, .08),
      inset 0 1px 1px rgba(255, 255, 255, .95);
  }
  .file-thumb {
    width: 42px; height: 42px;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(199,210,254,.62), rgba(221,214,254,.52));
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
    border: 1px solid rgba(255, 255, 255, .60);
    flex-shrink: 0;
    display: flex; align-items: center; justify-content: center;
    color: var(--primary); font-size: calc(18px * var(--font-scale, 1));
    position: relative;
    isolation: isolate;
    overflow: hidden;
    box-shadow:
      0 3px 10px rgba(15, 23, 42, .07),
      inset 0 1px 1px rgba(255, 255, 255, .90),
      inset 0 -1px 1px rgba(255, 255, 255, .30),
      inset 0 0 14px rgba(255, 255, 255, .28);
  }
  .file-thumb img {
    width: 100%; height: 100%;
    object-fit: cover;
  }
  .file-info { flex: 1; min-width: 0; }
  .file-name {
    font-size: calc(13px * var(--font-scale, 1)); font-weight: var(--fw-semibold);
    letter-spacing: var(--ls-tight);
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  }
  .file-meta {
    font-size: calc(11px * var(--font-scale, 1)); color: var(--text-tertiary);
    font-weight: var(--fw-regular);
    margin-top: 3px;
    display: flex; align-items: center; gap: 5px;
  }
  .file-meta .pulse {
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--warning);
    animation: pulse 1.2s infinite;
  }
  .file-meta.done .pulse { background: var(--success); animation: none; }
  @keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
  }
  .file-remove {
    background: linear-gradient(135deg, rgba(255,255,255,.50), rgba(255,255,255,.28));
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
    border: 1px solid rgba(255, 255, 255, .58);
    cursor: pointer;
    color: var(--text-tertiary); padding: 4px 7px;
    border-radius: 7px;
    transition: all .2s cubic-bezier(.4, 0, .2, 1);
    box-shadow:
      inset 0 1px 1px rgba(255, 255, 255, .82),
      0 1px 3px rgba(15, 23, 42, .04);
  }
  .file-remove:hover {
    color: var(--danger);
    background: linear-gradient(135deg, rgba(254,242,242,.92), rgba(254,226,226,.66));
    border-color: rgba(252, 165, 165, .62);
    transform: scale(1.07);
  }

  .upload-tips {
    margin-top: 20px;
    padding: 14px 16px;
    background: linear-gradient(135deg, rgba(245,243,255,.72), rgba(238,242,255,.46));
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
    border: 1px solid rgba(255, 255, 255, .62);
    border-radius: var(--radius-sm);
    font-size: calc(12px * var(--font-scale, 1));
    color: var(--text-secondary);
    line-height: 1.7;
    box-shadow: var(--shadow-2), inset 0 1px 1px rgba(255, 255, 255, .88);
  }
  .upload-tips .title {
    display: flex; align-items: center; gap: 6px;
    font-weight: var(--fw-semibold);
    letter-spacing: .1px;
    color: var(--primary);
    margin-bottom: 5px;
  }

  /* ===== Center: Result ===== */
  .result-toolbar { display: flex; gap: 6px; }
  .ghost-btn {
    padding: 6px 13px;
    border-radius: 10px;
    background: linear-gradient(135deg, rgba(255,255,255,.50), rgba(255,255,255,.28));
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
    border: 1px solid rgba(255, 255, 255, .60);
    font-size: calc(12px * var(--font-scale, 1));
    font-weight: var(--fw-medium);
    letter-spacing: .1px;
    color: var(--text-secondary);
    box-shadow: var(--shadow-1), inset 0 1px 1px rgba(255, 255, 255, .82);
    transition: color var(--dur) var(--ease-out),
                background var(--dur) var(--ease-out),
                border-color var(--dur) var(--ease-out),
                transform var(--dur) var(--ease-spring),
                box-shadow var(--dur) var(--ease-out);
  }
  .ghost-btn:hover {
    color: var(--text);
    background: linear-gradient(135deg, rgba(255,255,255,.74), rgba(255,255,255,.46));
    border-color: rgba(255, 255, 255, .98);
    transform: translateY(-2px) scale(1.03);
    box-shadow: var(--shadow-3), inset 0 1px 1px rgba(255, 255, 255, .98);
  }
  .ghost-btn:active { transform: translateY(0) scale(.97); }

  .empty-state {
    flex: 1;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    text-align: center;
    color: var(--text-tertiary);
    padding: 40px 20px;
  }
  .empty-state svg {
    margin-bottom: 14px;
    opacity: .75;
    padding: 17px;
    border-radius: 50%;
    color: var(--primary);
    background: linear-gradient(135deg, rgba(255,255,255,.50), rgba(255,255,255,.24));
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
    border: 1px solid rgba(255, 255, 255, .62);
    box-shadow:
      inset 0 1px 1px rgba(255, 255, 255, .88),
      0 4px 16px rgba(15, 23, 42, .07);
  }
  .empty-state h4 {
    font-size: calc(14px * var(--font-scale, 1));
    font-weight: var(--fw-semibold);
    letter-spacing: var(--ls-tight);
    color: var(--text-secondary);
    margin-bottom: 6px;
  }
  .empty-state p { font-size: calc(12px * var(--font-scale, 1)); line-height: 1.7; }
  .empty-state .empty-sample { margin-top: 16px; }

  /* 上传栏底部的「载入示例」入口。虚线框是为了跟上面的上传区区分开:
     它是"没东西可用时的兜底",不是主入口 */
  .sample-btn {
    appearance: none;
    width: 100%;
    margin-top: 10px;
    padding: 9px 12px;
    border-radius: var(--radius-sm, 12px);
    border: 1px dashed var(--border-strong);
    background: transparent;
    color: var(--text-secondary);
    font-size: calc(12.5px * var(--font-scale, 1));
    transition: border-color var(--dur) var(--ease-out),
                background var(--dur) var(--ease-out),
                color var(--dur) var(--ease-out);
  }
  .sample-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(var(--primary-rgb), .07);
  }
  .sample-btn:disabled { opacity: .5; cursor: default; }
  [data-theme="dark"] .sample-btn { border-color: rgba(255, 255, 255, .22); }
  [data-theme="dark"] .sample-btn:hover { border-color: var(--primary); }

  .result-content { display: none; }
  .result-content.active { display: block; animation: fadeIn .35s ease; }
  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .meta-row {
    display: flex; flex-wrap: wrap; gap: 8px;
    margin-bottom: 18px;
  }
  .meta-tag {
    padding: 6px 12px;
    border-radius: 999px;
    background: linear-gradient(135deg, rgba(255,255,255,.52), rgba(255,255,255,.30));
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
    border: 1px solid rgba(255, 255, 255, .62);
    font-size: calc(12px * var(--font-scale, 1));
    font-weight: var(--fw-medium);
    color: var(--text-secondary);
    display: inline-flex; align-items: center; gap: 6px;
    box-shadow: var(--shadow-1), inset 0 1px 1px rgba(255, 255, 255, .85);
    transition: transform var(--dur) var(--ease-spring),
                box-shadow var(--dur) var(--ease-out),
                background var(--dur) var(--ease-out);
  }
  .meta-tag:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-2), inset 0 1px 1px rgba(255, 255, 255, .95);
  }
  .meta-tag .dot {
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--success);
  }
  .meta-tag.primary {
    background: linear-gradient(135deg, rgba(238,242,255,.80), rgba(224,231,255,.55));
    border-color: rgba(199, 210, 254, .80);
    color: var(--primary);
  }
  .meta-tag.primary .dot { background: var(--primary); }
  .meta-tag.warn {
    background: linear-gradient(135deg, rgba(255,251,235,.80), rgba(254,243,199,.55));
    border-color: rgba(253, 230, 138, .80);
    color: #b45309;
  }
  .meta-tag.warn .dot { background: var(--warning); }

  .result-section { margin-bottom: 24px; }
  .result-section h5 {
    font-size: calc(11px * var(--font-scale, 1));
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
    font-weight: var(--fw-semibold);
  }

  .problem-card {
    background: linear-gradient(135deg, rgba(255,255,255,.58), rgba(255,255,255,.36));
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
    padding: 18px 20px;
    border-radius: var(--radius);
    font-size: calc(14px * var(--font-scale, 1));
    line-height: 1.9;
    border: 1px solid rgba(255, 255, 255, .62);
    border-left: 3px solid var(--primary);
    color: var(--text);
    box-shadow: var(--shadow-3), inset 0 1px 1px rgba(255, 255, 255, .90);
    transition: box-shadow var(--dur-slow) var(--ease-out),
                transform var(--dur-slow) var(--ease-out);
  }
  .problem-card:hover {
    transform: translateY(-2px);
    box-shadow:
      0 2px 6px rgba(15, 23, 42, .05),
      0 10px 26px rgba(15, 23, 42, .09),
      inset 0 1px 1px rgba(255, 255, 255, .98);
  }
  .problem-card .label {
    display: inline-block;
    padding: 1px 6px;
    background: linear-gradient(135deg, rgba(238,242,255,.90), rgba(224,231,255,.65));
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border: 1px solid rgba(199, 210, 254, .72);
    color: var(--primary);
    border-radius: 7px;
    font-size: calc(12px * var(--font-scale, 1));
    font-weight: 500;
    margin: 0 2px;
    font-family: 'Cambria Math', 'STIX Two Math', 'Times New Roman', serif;
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, .90);
  }

  .info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 10px;
  }
  .info-cell {
    padding: 12px 15px;
    background: linear-gradient(135deg, rgba(255,255,255,.50), rgba(255,255,255,.28));
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, .60);
    box-shadow: var(--shadow-1), inset 0 1px 1px rgba(255, 255, 255, .85);
    transition: transform var(--dur) var(--ease-spring),
                box-shadow var(--dur) var(--ease-out),
                border-color var(--dur) var(--ease-out);
  }
  .info-cell:hover {
    transform: translateY(-2px);
    border-color: rgba(199, 210, 254, .95);
    box-shadow: var(--shadow-3), inset 0 1px 1px rgba(255, 255, 255, .96);
  }
  .info-cell .key {
    font-size: calc(11px * var(--font-scale, 1));
    color: var(--text-tertiary);
    font-weight: var(--fw-regular);
    letter-spacing: .1px;
    margin-bottom: 5px;
  }
  .info-cell .val {
    font-size: calc(13px * var(--font-scale, 1));
    font-weight: var(--fw-semibold);
    letter-spacing: var(--ls-tight);
    color: var(--text);
  }

  /* ===== 控件里的文字一律不许逐字换行 =====
     按钮是 flex 容器,里面的文字会变成"匿名 flex 子项"。宽度不够时它不会
     溢出,而是**逐字换行** —— 中文就竖起来了(「收藏题目」被压成一列两个字)。
     踩过:操作栏加了第 4 个按钮之后,4 个按钮挤在 390px 里,全部变成竖排。

     一次性把所有带文字的控件钉成 nowrap;真放不下时由外层 flex-wrap 换行,
     或由窄屏规则缩小,绝不逐字断。新增带文字的控件记得加进这个清单。 */
  .btn, .btn-mini, .ghost-btn, .sample-btn, .seg-item,
  .tab-item, .subject-option, .subject-trigger, .modal-title { white-space: nowrap; }

  .action-bar {
    display: flex; gap: 10px; flex-wrap: wrap;
    padding: 14px 20px;
    border-top: 1px solid rgba(255, 255, 255, .60);
    background: linear-gradient(135deg, rgba(255,255,255,.42), rgba(255,255,255,.18));
  }
  .btn {
    position: relative;
    isolation: isolate;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-edge);
    background: var(--glass-tint);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    font-size: calc(13px * var(--font-scale, 1)); font-weight: var(--fw-semibold);
    letter-spacing: .1px;
    color: var(--text);
    display: inline-flex; align-items: center; gap: 6px;
    box-shadow: var(--glass-refract);
    transition: background var(--dur) var(--ease-out),
                border-color var(--dur) var(--ease-out),
                transform var(--dur) var(--ease-spring),
                box-shadow var(--dur) var(--ease-out);
  }
  .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--glass-refract-hover);
  }
  .btn:active { transform: translateY(0) scale(.97); }
  .btn-primary {
    background: linear-gradient(135deg, rgba(var(--primary-rgb),.92), rgba(var(--primary-2-rgb),.88));
    color: white;
    border-color: rgba(255, 255, 255, .45);
    box-shadow:
      0 2px 6px rgba(var(--primary-rgb), .18),
      0 6px 20px rgba(var(--primary-rgb), .30),
      inset 0 1.5px 1px rgba(255, 255, 255, .70),
      inset 0 -1px 1px rgba(255, 255, 255, .25),
      inset 0 0 18px rgba(255, 255, 255, .22);
  }
  .btn-primary:hover {
    box-shadow:
      0 4px 10px rgba(var(--primary-rgb), .22),
      0 12px 30px rgba(var(--primary-rgb), .44),
      inset 0 1.5px 1px rgba(255, 255, 255, .88),
      inset 0 0 24px rgba(255, 255, 255, .34);
  }
  .spacer { flex: 1; }

  /* ===== Right: Chat ===== */
  .chat-panel { display: flex; flex-direction: column; }
  /* 在线指示灯:外圈缓慢呼吸,暗示"模型在线" */
  .status-dot {
    width: 7px; height: 7px; border-radius: 50%;
    background: var(--success);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, .15);
    animation: status-breathe 2.6s ease-in-out infinite;
  }
  @keyframes status-breathe {
    0%, 100% { box-shadow: 0 0 0 3px rgba(16, 185, 129, .15); }
    50%      { box-shadow: 0 0 0 5px rgba(16, 185, 129, .07); }
  }

  .chat-messages {
    flex: 1; overflow-y: auto; overflow-x: hidden;
    padding: 20px;
    display: flex; flex-direction: column; gap: 16px;
    min-height: 0;
  }

  .message {
    display: flex; gap: 10px;
    max-width: 92%;
    animation: fadeUp var(--dur-slow) var(--ease-out);
  }
  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
  }
  .message.user { align-self: flex-end; flex-direction: row-reverse; }

  .avatar {
    position: relative;
    isolation: isolate;
    width: 32px; height: 32px;
    border-radius: 50%;
    flex-shrink: 0;
    display: flex; align-items: center; justify-content: center;
    font-size: calc(11px * var(--font-scale, 1)); font-weight: 700;
    color: white;
    border: 1px solid rgba(255, 255, 255, .50);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
  }
  /* 液态扭曲外壳 */
  .avatar::before {
    content: '';
    position: absolute;
    inset: -2.5px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(199, 210, 254, .52), rgba(233, 213, 255, .44));
    filter: url(#liquid-edge);
    z-index: -1;
    opacity: .90;
    pointer-events: none;
  }
  .message.ai .avatar {
    background: linear-gradient(135deg, rgba(var(--primary-rgb),.92), rgba(var(--primary-2-rgb),.88));
    box-shadow:
      0 4px 12px rgba(var(--primary-rgb), .30),
      inset 0 1.5px 1px rgba(255, 255, 255, .75),
      inset 0 -1px 1px rgba(255, 255, 255, .25),
      inset 0 0 14px rgba(255, 255, 255, .24);
  }
  .message.user .avatar {
    background: linear-gradient(135deg, rgba(245,158,11,.92), rgba(249,115,22,.88));
    box-shadow:
      0 4px 12px rgba(245, 158, 11, .28),
      inset 0 1.5px 1px rgba(255, 255, 255, .75),
      inset 0 -1px 1px rgba(255, 255, 255, .25),
      inset 0 0 14px rgba(255, 255, 255, .24);
  }

  .bubble {
    padding: 12px 15px;
    border-radius: var(--radius);
    font-size: calc(14px * var(--font-scale, 1));
    line-height: 1.72;
    word-wrap: break-word;
    /* ⚠️ 必须显式给 min-width:0。气泡是 flex 子项,默认 min-width:auto
       意味着"不能缩到比内容还窄" —— 遇到长公式这种不可折行的内容时,
       气泡会直接撑破父容器、把整列顶出横向溢出(表现:回答右侧文字被裁)。
       有了它,`.katex-display` 的 max-width:100% + overflow-x:auto
       才有意义 —— 否则那个 100% 等于"被撑宽之后的自己",永远不触发。 */
    min-width: 0;
    transition: transform var(--dur-slow) var(--ease-out),
                box-shadow var(--dur-slow) var(--ease-out);
  }
  .message.ai .bubble {
    background: linear-gradient(135deg, rgba(255,255,255,.70), rgba(255,255,255,.46));
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
    border: 1px solid rgba(255, 255, 255, .64);
    color: var(--text);
    border-top-left-radius: 4px;
    box-shadow: var(--shadow-2), inset 0 1px 1px rgba(255, 255, 255, .92);
  }
  .message.ai .bubble:hover {
    transform: translateY(-2px);
    box-shadow:
      0 2px 6px rgba(15, 23, 42, .05),
      0 8px 22px rgba(15, 23, 42, .09),
      inset 0 1px 1px rgba(255, 255, 255, .98);
  }
  .message.user .bubble {
    background: linear-gradient(135deg, rgba(var(--primary-rgb),.92), rgba(var(--primary-2-rgb),.88));
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid rgba(255, 255, 255, .45);
    color: white;
    border-top-right-radius: 4px;
    box-shadow:
      0 2px 6px rgba(var(--primary-rgb), .18),
      0 6px 18px rgba(var(--primary-rgb), .30),
      inset 0 1.5px 1px rgba(255, 255, 255, .70),
      inset 0 -1px 1px rgba(255, 255, 255, .22),
      inset 0 0 16px rgba(255, 255, 255, .20);
  }
  .message.user .bubble:hover {
    transform: translateY(-2px);
    box-shadow:
      0 4px 10px rgba(var(--primary-rgb), .22),
      0 12px 28px rgba(var(--primary-rgb), .40),
      inset 0 1.5px 1px rgba(255, 255, 255, .80),
      inset 0 0 20px rgba(255, 255, 255, .28);
  }
  .bubble strong { font-weight: 600; }
  .bubble em { font-style: italic; opacity: .92; }
  .bubble ol, .bubble ul { margin: 8px 0; padding-left: 0; list-style: none; }
  .bubble ul > li {
    position: relative;
    padding-left: 16px;
    margin: 5px 0;
  }
  /* 自定义项目符号:沿用品牌色,避免深色主题下默认圆点看不清 */
  .bubble ul > li::before {
    content: '';
    position: absolute;
    left: 3px; top: .62em;
    width: 5px; height: 5px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-2));
  }
  .bubble ol { counter-reset: bubble-ol; }
  .bubble ol > li {
    position: relative;
    counter-increment: bubble-ol;
    padding-left: 24px;
    margin: 5px 0;
  }
  .bubble ol > li::before {
    content: counter(bubble-ol);
    position: absolute;
    left: 0; top: .04em;
    width: 17px; height: 17px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: calc(10px * var(--font-scale, 1)); font-weight: 700;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--primary-2));
    box-shadow: 0 1px 3px rgba(var(--primary-rgb), .34);
  }
  /* 段落间距由容器统一压掉首尾,避免气泡上多出一块空白 */
  .bubble-p { margin: 0; }
  .bubble-p + .bubble-p { margin-top: 8px; }
  .bubble > .bubble-p:first-child { margin-top: 0; }
  .bubble > .bubble-p:last-child { margin-bottom: 0; }
  .bubble-h {
    font-size: calc(14px * var(--font-scale, 1));
    font-weight: 700;
    letter-spacing: var(--ls-tight);
    margin: 2px 0 6px;
  }
  .bubble hr {
    border: none;
    height: 1px;
    margin: 10px 0;
    background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
  }
  /* 多行代码块:独立底色 + 横向滚动,长公式不折行 */
  .bubble .code-block {
    margin: 8px 0;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    background: rgba(15, 23, 42, .045);
    border: 1px solid var(--border);
    overflow-x: auto;
    line-height: 1.7;
  }
  .bubble .code-block code {
    background: none;
    padding: 0;
    border-radius: 0;
    font-size: calc(12.5px * var(--font-scale, 1));
    color: var(--text);
  }
  .bubble code {
    background: rgba(var(--primary-rgb), 0.1);
    padding: 1px 6px;
    border-radius: 4px;
    font-size: calc(13px * var(--font-scale, 1));
    font-family: 'SF Mono', Consolas, monospace;
    color: var(--primary);
  }
  .message.user .bubble code {
    background: rgba(255, 255, 255, 0.25);
    color: white;
  }
  .message.user .bubble .code-block {
    background: rgba(0, 0, 0, .16);
    border-color: rgba(255, 255, 255, .22);
  }
  .message.user .bubble .code-block code { color: #fff; }
  .message.user .bubble ul > li::before { background: rgba(255, 255, 255, .92); }
  .message.user .bubble hr { background: linear-gradient(90deg, transparent, rgba(255,255,255,.45), transparent); }

  .typing {
    display: inline-flex; gap: 4px;
    padding: 4px 0;
  }
  /* 只给"点"上样式。这里以前写的是 `.typing span` —— 后代选择器会把
     后加的 .typing-label 一起命中,于是标签文字被压成 6px 的小方块、
     一个汉字一行,还溢出到气泡外面。所以改成语义化的 .dot。 */
  .typing .dot {
    width: 6px; height: 6px;
    flex-shrink: 0;
    border-radius: 50%;
    background: var(--text-tertiary);
    animation: bounce 1.2s infinite;
  }
  .typing .dot:nth-child(2) { animation-delay: 0.15s; }
  .typing .dot:nth-child(3) { animation-delay: 0.3s; }
  @keyframes bounce {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-6px); opacity: 1; }
  }

  /* 带文字的等待态。DeepSeek V4 这类模型会先跑一段思维链,
     这期间正文一个字都没有 —— 光靠三个弹跳点,用户会以为卡死了。
     （实测「举一反三」这类题首字要等 8~17 秒,所以这个提示很有必要。） */
  .typing.with-label { gap: 6px; align-items: center; }
  .typing .typing-label {
    margin-left: 4px;
    font-size: calc(12px * var(--font-scale, 1));
    color: var(--text-tertiary);
    letter-spacing: .2px;
    line-height: 1.4;
    /* 文字按正常横排:禁止在字与字之间断行 */
    white-space: nowrap;
    writing-mode: horizontal-tb;
  }
  /* 省略号容器:预留固定宽度,免得点一个个冒出来时气泡宽度来回跳 */
  .typing .typing-label .dots {
    display: inline-block;
    width: 1.2em;
    text-align: left;
    white-space: nowrap;
  }
  .typing .typing-label .dots::after {
    content: '';
    animation: dots 1.4s steps(4, end) infinite;
  }
  @keyframes dots {
    0% { content: ''; } 25% { content: '.'; }
    50% { content: '..'; } 75% { content: '...'; }
  }

  /* 建议芯片:固定排成一行。
     原来是 flex-wrap: wrap —— 右栏默认 400px 时,四枚芯片的总宽刚好卡在临界点上,
     稍微一超(换个字号、紧凑密度、窄一点的栏)就会掉成两行,"参数变化"被挤到下面。
     现在改成 nowrap + 横向滚动兜底,并把内边距收一点给出让位空间:
     正常字号下四条完整显示、不会触发滚动。
     上下留白比看上去需要的更多,是为了不裁掉悬停时的抬升与外发光
     (overflow-x 一旦不是 visible,另一轴会被强制成 auto 并产生裁切)。 */
  .suggestions {
    display: flex; flex-wrap: nowrap; gap: 6px;
    padding: 8px 16px 12px;
    overflow-x: auto; overflow-y: hidden;
    overscroll-behavior-x: contain;   /* 横向滑动到头时别把整页带跑 */
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x proximity;
    scrollbar-width: none; -ms-overflow-style: none;
  }
  .suggestions::-webkit-scrollbar { width: 0; height: 0; display: none; }
  .suggestion-chip {
    flex: 0 0 auto;
    white-space: nowrap;
    scroll-snap-align: start;
    padding: 7px 10px;
    border-radius: 999px;
    background: linear-gradient(135deg, rgba(255,255,255,.54), rgba(255,255,255,.30));
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
    border: 1px solid rgba(255, 255, 255, .62);
    font-size: calc(12px * var(--font-scale, 1));
    font-weight: var(--fw-medium);
    letter-spacing: .1px;
    color: var(--text-secondary);
    box-shadow: var(--shadow-1), inset 0 1px 1px rgba(255, 255, 255, .88);
    transition: color var(--dur) var(--ease-out),
                background var(--dur) var(--ease-out),
                border-color var(--dur) var(--ease-out),
                transform var(--dur) var(--ease-spring),
                box-shadow var(--dur) var(--ease-out);
  }
  .suggestion-chip:hover {
    background: linear-gradient(135deg, rgba(238,242,255,.88), rgba(245,243,255,.66));
    color: var(--primary);
    border-color: rgba(255, 255, 255, .98);
    transform: translateY(-3px) scale(1.03);
    box-shadow: var(--chip-shadow-hover);
  }
  .suggestion-chip:active { transform: translateY(-1px) scale(.97); }

  .chat-input-wrap {
    padding: 12px 18px 14px;
    border-top: 1px solid rgba(255, 255, 255, .60);
    background: linear-gradient(135deg, rgba(255,255,255,.40), rgba(255,255,255,.16));
  }
  .chat-input {
    display: flex; align-items: flex-end;
    gap: 8px;
    background: linear-gradient(135deg, rgba(255,255,255,.62), rgba(255,255,255,.38));
    backdrop-filter: var(--glass-blur-soft);
    -webkit-backdrop-filter: var(--glass-blur-soft);
    border-radius: var(--radius);
    padding: 8px 8px 8px 14px;
    border: 1.5px solid rgba(255, 255, 255, .62);
    box-shadow:
      inset 0 1px 1px rgba(255, 255, 255, .88),
      0 2px 8px rgba(15, 23, 42, .05);
    transition: all .25s cubic-bezier(.4, 0, .2, 1);
  }
  .chat-input:focus-within {
    background: linear-gradient(135deg, rgba(255,255,255,.76), rgba(255,255,255,.52));
    border-color: rgba(var(--primary-rgb), .55);
    box-shadow:
      0 0 0 4px rgba(var(--primary-rgb), .10),
      inset 0 1px 1px rgba(255, 255, 255, .96),
      0 4px 14px rgba(var(--primary-rgb), .12);
  }
  .chat-input textarea {
    flex: 1; border: none; background: none; outline: none;
    resize: none;
    font-size: calc(14px * var(--font-scale, 1));
    line-height: 1.5;
    max-height: 120px;
    padding: 6px 0;
    color: var(--text);
  }
  .chat-input textarea::placeholder { color: var(--text-tertiary); }
  .send-btn {
    position: relative;
    isolation: isolate;
    width: 36px; height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(var(--primary-rgb),.92), rgba(var(--primary-2-rgb),.88));
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    color: white;
    border: 1px solid rgba(255, 255, 255, .50);
    display: flex; align-items: center; justify-content: center;
    transition: all .25s cubic-bezier(.4, 0, .2, 1);
    flex-shrink: 0;
    box-shadow:
      0 5px 16px rgba(var(--primary-rgb), .32),
      inset 0 1.5px 1px rgba(255, 255, 255, .75),
      inset 0 -1px 1px rgba(255, 255, 255, .25),
      inset 0 0 16px rgba(255, 255, 255, .24);
  }
  /* 液态扭曲外壳 */
  .send-btn::before {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(199, 210, 254, .56), rgba(221, 214, 254, .46));
    filter: url(#liquid-edge);
    z-index: -1;
    opacity: .90;
    pointer-events: none;
  }
  .send-btn:hover:not(:disabled) {
    transform: translateY(-1px) scale(1.06);
    box-shadow:
      0 8px 22px rgba(var(--primary-rgb), .45),
      inset 0 1.5px 1px rgba(255, 255, 255, .90),
      inset 0 0 22px rgba(255, 255, 255, .36);
  }
  .send-btn:active:not(:disabled) { transform: translateY(0) scale(.95); }
  .send-btn:disabled {
    background: linear-gradient(135deg, rgba(203,213,225,.72), rgba(148,163,184,.62));
    box-shadow:
      inset 0 1px 1px rgba(255, 255, 255, .60),
      0 2px 6px rgba(15, 23, 42, .06);
    cursor: not-allowed;
  }
  .send-btn:disabled::before { opacity: 0; }

  /* Scrollbar */
  ::-webkit-scrollbar { width: 6px; height: 6px; }
  ::-webkit-scrollbar-track { background: transparent; }
  ::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: 3px;
  }
  ::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }