* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; -webkit-user-select: none; user-select: none; -webkit-touch-callout: none; }
    textarea, input[type="text"], input[type="number"], input[type="email"], input[type="password"] { -webkit-user-select: text; user-select: text; -webkit-touch-callout: default; }
    html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-rendering: optimizeLegibility; image-rendering: -webkit-optimize-contrast; }
    
    html, body {
      font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Helvetica Neue', sans-serif;
      height: 100%;
      height: 100dvh;
      overflow: hidden;
    }
    :root {
      --app-height: 100dvh;
      --toolbar-btn-size: 32px;
      --font-size: 15px;
      --input-height: 44px;
      --input-bottom-offset: 0px;
      --input-bg-opacity: 1.0;
      --input-bg-blur: 0px;
      --font-weight: 400;
      --font-family-preset: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Helvetica Neue', sans-serif;
      /* ===== Theme variables (light) ===== */
      --theme-bg: #f5f6fa;
      --theme-text: #333333;
      --theme-text-secondary: #888888;
      --theme-text-muted: #aaaaaa;
      --theme-bubble-ai-bg: #ffffff;
      --theme-bubble-ai-text: #333333;
      --theme-input-bg: rgba(255,255,255,1);
      --theme-input-text: #333333;
      --theme-btn-bg: rgba(255,255,255,0.85);
      --theme-btn-text: #333333;
      --theme-btn-border: rgba(0,0,0,0.2);
      --theme-settings-bg: #ffffff;
      --theme-settings-group-bg: #fafbff;
      --theme-settings-border: rgba(0,0,0,0.04);
      --theme-divider: #f0f0f0;
      --theme-card-bg: #ffffff;
      --theme-card-text: #333333;
      --theme-char-dropdown-bg: #ffffff;
      --theme-char-dropdown-text: #333333;
      --theme-search-bg: rgba(255,255,255,0.95);
      --theme-search-text: #333333;
      --theme-search-border: rgba(0,0,0,0.1);
      --theme-edit-banner-bg: rgba(255,255,255,0.92);
    }

    /* ===== Dark Mode Theme ===== */
    [data-theme="dark"] {
      --theme-bg: #1a1a2e;
      --theme-text: #e0e0e0;
      --theme-text-secondary: #aaaaaa;
      --theme-text-muted: #777777;
      --theme-bubble-ai-bg: #2d2d44;
      --theme-bubble-ai-text: #e0e0e0;
      --theme-input-bg: rgba(45,45,68,0.9);
      --theme-input-text: #e0e0e0;
      --theme-btn-bg: rgba(45,45,68,0.85);
      --theme-btn-text: #e0e0e0;
      --theme-btn-border: rgba(255,255,255,0.15);
      --theme-settings-bg: #1e1e32;
      --theme-settings-group-bg: #252540;
      --theme-settings-border: rgba(255,255,255,0.06);
      --theme-divider: #333355;
      --theme-card-bg: #1e1e32;
      --theme-card-text: #e0e0e0;
      --theme-char-dropdown-bg: #252540;
      --theme-char-dropdown-text: #e0e0e0;
      --theme-search-bg: rgba(45,45,68,0.95);
      --theme-search-text: #e0e0e0;
      --theme-search-border: rgba(255,255,255,0.1);
      --theme-edit-banner-bg: rgba(30,30,50,0.92);
    }
    @media (prefers-color-scheme: dark) {
      :root:not([data-theme="light"]) {
        --theme-bg: #1a1a2e;
        --theme-text: #e0e0e0;
        --theme-text-secondary: #aaaaaa;
        --theme-text-muted: #777777;
        --theme-bubble-ai-bg: #2d2d44;
        --theme-bubble-ai-text: #e0e0e0;
        --theme-input-bg: rgba(45,45,68,0.9);
        --theme-input-text: #e0e0e0;
        --theme-btn-bg: rgba(45,45,68,0.85);
        --theme-btn-text: #e0e0e0;
        --theme-btn-border: rgba(255,255,255,0.15);
        --theme-settings-bg: #1e1e32;
        --theme-settings-group-bg: #252540;
        --theme-settings-border: rgba(255,255,255,0.06);
        --theme-divider: #333355;
        --theme-card-bg: #1e1e32;
        --theme-card-text: #e0e0e0;
        --theme-char-dropdown-bg: #252540;
        --theme-char-dropdown-text: #e0e0e0;
        --theme-search-bg: rgba(45,45,68,0.95);
        --theme-search-text: #e0e0e0;
        --theme-search-border: rgba(255,255,255,0.1);
        --theme-edit-banner-bg: rgba(30,30,50,0.92);
      }
    }

    body {
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    }

    /* ===== 初始配置界面 ===== */
    #setupScreen {
      position: relative;
      z-index: 1;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      height: 100%;
      height: var(--app-height, 100vh);
      padding: 24px;
      overflow-y: auto;
    }
    #setupScreen.hidden { display: none; }

    .card {
      background: white;
      border-radius: 28px;
      padding: 32px 24px;
      border: 1px solid rgba(255,255,255,0.1);
      width: 100%;
      max-width: 420px;
      box-shadow: 0 20px 60px rgba(0,0,0,0.15), 0 8px 20px rgba(0,0,0,0.08);
    }
    .logo {
      width: 64px; height: 64px;
      border-radius: 18px;
      margin: 0 auto 14px;
      overflow: hidden;
      box-shadow: 0 8px 20px rgba(102,126,234,0.3);
    }
    .logo img { width: 100%; height: 100%; object-fit: cover; }
    .card h1 { font-size: 20px; color: #333; text-align: center; margin-bottom: 4px; }
    .card .sub { font-size: 13px; color: #aaa; text-align: center; margin-bottom: 20px; }

    .field { margin-bottom: 14px; }
    .field label { display: block; font-size: 12px; font-weight: 600; color: #888; margin-bottom: 5px; letter-spacing: 0.5px; }
    .field input {
      width: 100%; padding: 12px 14px;
      border: 2px solid #eee; border-radius: 12px;
      font-size: 15px; outline: none;
      transition: border-color 0.2s; -webkit-appearance: none;
    }
    .field input:focus { border-color: #667eea; }
    .field .hint { font-size: 11px; color: #ccc; margin-top: 4px; }

    .go-btn {
      width: 100%; padding: 14px;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      color: white; border: none; border-radius: 14px;
      font-size: 16px; font-weight: 700; cursor: pointer;
      margin-top: 6px; transition: transform 0.15s; -webkit-appearance: none;
    }
    .go-btn:active { transform: scale(0.97); }

    .help-btn {
      display: block; text-align: center; margin-top: 12px;
      font-size: 13px; color: #667eea; background: none;
      border: none; cursor: pointer; width: 100%;
    }
    .help-box {
      display: none; background: #f5f3ff; border-radius: 12px;
      padding: 14px; margin-top: 10px; font-size: 12px;
      color: #555; line-height: 1.9;
    }
    .help-box.show { display: block; }
    .help-box b { color: #667eea; }
    .help-box ol { padding-left: 18px; }

    /* ===== 背景层 - 容器 ===== */
    #bgLayer {
      position: fixed; top: 0; left: 0; right: 0; bottom: 0;
      z-index: 0;
      background-color: #f5f6fa;
      overflow: hidden;
    }

    /* ===== 聊天界面 ===== */
    #chatScreen {
      display: none;
      flex-direction: column;
      height: 100%;
      height: var(--app-height, 100vh);
      width: 100%;
      position: relative;
      z-index: 1;
      background: transparent !important;
    }
    #chatScreen.active { display: flex; }
    body:has(#chatScreen.active) { background: transparent; }

    /* 导航栏 - 完全透明 */
    .nav-bar {
      background: transparent !important;
      color: white;
      padding: 4px 10px;
      padding-top: calc(4px + env(safe-area-inset-top));
      display: flex; align-items: center; justify-content: space-between;
      flex-shrink: 0;
    }
    .nav-bar .left { display: flex; align-items: center; gap: 6px; }
    .nav-bar .av {
      width: 28px; height: 28px; border-radius: 50%;
      background: rgba(0,0,0,0.2);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      display: flex; align-items: center; justify-content: center;
      font-size: 12px; overflow: hidden;
      
    }
    .nav-bar .av img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }
    .nav-bar .name { font-weight: 600; font-size: 15px; text-shadow: 0 1px 3px rgba(0,0,0,0.3); }
    .nav-bar .status { font-size: 10px; opacity: 0.8; text-shadow: 0 1px 2px rgba(0,0,0,0.2); }
    .nav-bar .right { display: flex; gap: 6px; }

    /* 消息区域 */
    .msgs {
      flex: 1; min-height: 0; overflow-y: auto; -webkit-overflow-scrolling: touch;
      padding: 14px 12px; padding-bottom: 140px;
      display: flex; flex-direction: column;
    }
    .msgs::-webkit-scrollbar { width: 3px; }
    .msgs::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.15); border-radius: 2px; }

    .m { margin-bottom: 12px; display: flex; animation: fadeUp 0.25s ease; }
    .m.me { justify-content: flex-end; }
    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(6px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* 气泡样式 - 默认圆角 */
    .m .txt {
      max-width: 72%; padding: 10px 14px;
      border-radius: 18px; font-size: var(--font-size, 15px);
      line-height: 1.65; word-break: break-word;
    }
    .m.me .txt {
      background: linear-gradient(135deg, #667eea, #764ba2);
      color: white; border-bottom-right-radius: 5px;
    }
    .m.ai .txt {
      background: white; color: #333;
      border-bottom-left-radius: 5px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
      font-weight: var(--font-weight, 400);
      font-family: var(--font-family-preset, inherit);
      transition: background 0.3s, box-shadow 0.3s;
    }
    .m.me .txt {
      font-weight: var(--font-weight, 400);
      font-family: var(--font-family-preset, inherit);
      transition: background 0.3s, box-shadow 0.3s;
    }


    body.bubble-comic .m .txt { border-radius: 20px; }
    body.bubble-comic .m.me .txt { border-bottom-right-radius: 4px; }
    body.bubble-comic .m.ai .txt { border-bottom-left-radius: 4px; }
    /* 打字动画 */
    .dots { display: flex; gap: 4px; padding: 4px 0; }
    .dots span {
      width: 7px; height: 7px; background: #bbb;
      border-radius: 50%; animation: dot 1.4s infinite;
    }
    .dots span:nth-child(2) { animation-delay: 0.15s; }
    .dots span:nth-child(3) { animation-delay: 0.3s; }
    @keyframes dot {
      0%, 60%, 100% { transform: translateY(0); opacity: 0.35; }
      30% { transform: translateY(-5px); opacity: 1; }
    }

    /* 打字光标 */
    .typing-cursor {
      display: inline-block;
      width: 2px; height: 1em;
      background: currentColor;
      animation: blink 0.8s infinite;
      vertical-align: text-bottom;
      margin-left: 2px;
    }
    @keyframes blink {
      0%, 100% { opacity: 1; }
      50% { opacity: 0; }
    }

    /* ===== 底部区域 - 半透明磨砂 ===== */
    .bottom-area {
      position: fixed;
      bottom: var(--input-bottom-offset, 0px);
      left: 0; right: 0;
      z-index: 50;
      background: transparent;
      border-top: 1px solid rgba(255,255,255,0.3);
      padding-bottom: env(safe-area-inset-bottom);
    }

    /* 浮动工具栏 - 横向可滚动 */
    .input-toolbar {
      display: flex; gap: 4px; padding: 6px 8px 2px;
      align-items: center;
      overflow-x: auto;
      overflow-y: hidden;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: none;
    }
    .input-toolbar::-webkit-scrollbar { display: none; }

    /* v58: Edit mode banner bar */
    .edit-banner {
      display: none;
      align-items: center;
      padding: 6px 12px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border-top: 1px solid rgba(102,126,234,0.15);
      gap: 8px;
    }
    .edit-banner.show { display: flex; }
    .edit-banner-label {
      font-size: 12px;
      color: #667eea;
      font-weight: 600;
      flex: 1;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }
    .edit-banner-preview {
      font-size: 12px;
      color: #888;
      max-width: 160px;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }
    .edit-banner-close {
      width: 24px; height: 24px;
      border-radius: 50%;
      border: none;
      background: rgba(0,0,0,0.06);
      color: #999;
      font-size: 14px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      transition: background 0.15s;
    }
    .edit-banner-close:active { background: rgba(0,0,0,0.12); }

    /* 豆包风格药丸按钮 (v32) */
    :root { --btn-bg-opacity: 0.85; --btn-bg-blur: 0px; }
    .db-btn {
      display: flex; align-items: center; gap: 4px;
      padding: calc(var(--toolbar-btn-size, 32px) * 0.15) calc(var(--toolbar-btn-size, 32px) * 0.25);
      border-radius: 20px;
      border: 1px solid rgba(0,0,0,0.2);
      background: rgba(255,255,255, var(--btn-bg-opacity));
      backdrop-filter: blur(var(--btn-bg-blur));
      -webkit-backdrop-filter: blur(var(--btn-bg-blur));
      font-size: calc(var(--toolbar-btn-size, 32px) * 0.4); color: #333;
      cursor: pointer;
      white-space: nowrap;
      flex-shrink: 0;
      transition: background 0.3s, box-shadow 0.3s, transform 0.15s;
      line-height: 1;
      box-shadow: 0 1px 4px rgba(0,0,0,0.08);
    }
    .db-btn:active { background: rgba(240,240,240, var(--btn-bg-opacity)); transform: scale(0.97); }
    .db-btn.active { background: rgba(102,126,234,0.15); border-color: rgba(102,126,234,0.4); color: #445; }
    .db-btn svg { stroke: #333; }
    .db-btn svg { flex-shrink: 0; width: calc(var(--toolbar-btn-size, 32px) * 0.5); height: calc(var(--toolbar-btn-size, 32px) * 0.5); }
    .db-btn .char-name-text {
      overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
      max-width: 90px; font-weight: 500;
    }

    /* 按钮特效已移除(v32) */

    /* 角色选择下拉菜单 */
    .char-dropdown {
      display: none;
      position: fixed;
      top: auto; bottom: auto;
      right: 10px;
      background: white;
      border-radius: 14px;
      box-shadow: 0 8px 32px rgba(0,0,0,0.18);
      padding: 8px 0;
      z-index: 200;
      min-width: 180px;
      max-width: 260px;
      animation: fadeUp 0.15s ease;
    }
    .char-dropdown.show { display: block; }
    .char-dropdown-header {
      padding: 8px 16px; font-size: 12px; color: #999;
      font-weight: 600; letter-spacing: 0.5px;
    }
    .char-dropdown-item {
      display: flex; align-items: center; justify-content: space-between;
      padding: 10px 16px; cursor: pointer;
      font-size: 14px; color: #333;
      transition: background 0.15s;
    }
    .char-dropdown-item:active { background: #f5f5f5; }
    .char-dropdown-item.active { color: #667eea; font-weight: 600; }
    .char-dropdown-item .char-del-btn {
      background: none; border: none; color: #ccc;
      font-size: 14px; cursor: pointer; padding: 2px 4px;
      border-radius: 4px;
    }
    .char-dropdown-item .char-del-btn:active { color: #e74c3c; background: rgba(231,76,60,0.1); }
    .add-char-btn {
      display: block; width: calc(100% - 16px);
      margin: 4px 8px; padding: 10px;
      background: #f5f3ff; color: #667eea;
      border: none; border-radius: 10px;
      font-size: 13px; font-weight: 600;
      cursor: pointer; text-align: center;
    }
    .add-char-btn:active { background: #ebe5ff; }

    /* 图片预览 */
    .img-preview-bar {
      display: none; align-items: center; gap: 8px;
      padding: 4px 10px;
    }
    .img-preview-bar.show { display: flex; }
    .img-preview-bar img {
      width: 48px; height: 48px; border-radius: 8px;
      object-fit: cover; border: 2px solid #eee;
    }
    .img-preview-bar .img-preview-remove {
      width: 22px; height: 22px; border-radius: 50%;
      background: rgba(0,0,0,0.1); border: none;
      font-size: 12px; cursor: pointer;
      display: flex; align-items: center; justify-content: center;
    }

    /* 输入行 */
    .input-row {
      display: flex; align-items: flex-end;
      padding: 4px 10px 8px;
      gap: 8px;
    }
    /* 输入框容器 - 包含加号按钮在内部 */
    .input-wrapper {
      flex: 1; position: relative;
      border-radius: 22px;
      display: flex; align-items: flex-end;
      background: rgba(255,255,255, var(--input-bg-opacity, 1));
      backdrop-filter: blur(var(--input-bg-blur, 0px));
      -webkit-backdrop-filter: blur(var(--input-bg-blur, 0px));
      min-height: var(--input-height, 44px);
      z-index: 1;
      box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    }
    .input-wrapper::before {
      content: '';
      position: absolute;
      top: -4px; left: -4px; right: -4px; bottom: -4px;
      border-radius: 26px;
      background: linear-gradient(90deg, #ff006e, #8338ec, #3a86ff, #00f5d4, #fee440, #ff006e);
      background-size: 400% 100%;
      animation: neonFlow 8s linear infinite;
      z-index: -2;
      filter: blur(6px);
      opacity: 0.8;
      -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      -webkit-mask-composite: xor;
      mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      mask-composite: exclude;
      padding: 4px;
    }
    .input-wrapper::after {
      content: '';
      position: absolute;
      top: -2px; left: -2px; right: -2px; bottom: -2px;
      border-radius: 24px;
      background: linear-gradient(90deg, #ff006e, #8338ec, #3a86ff, #00f5d4, #fee440, #ff006e);
      background-size: 400% 100%;
      animation: neonFlow 8s linear infinite;
      z-index: -1;
      -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      -webkit-mask-composite: xor;
      mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      mask-composite: exclude;
      padding: 2px;
    }
    @keyframes neonFlow {
      0% { background-position: 0% 50%; }
      100% { background-position: 400% 50%; }
    }
    .plus-btn {
      width: 36px; height: 36px;
      border-radius: 50%; border: none;
      background: transparent;
      font-size: 22px; color: #667eea;
      cursor: pointer; flex-shrink: 0;
      display: flex; align-items: center; justify-content: center;
      align-self: center;
      margin: 0 0 0 4px;
      transition: background 0.2s;
    }
    .plus-btn:active { background: rgba(102,126,234,0.1); }
    .plus-btn svg { pointer-events: none; }
    .input-wrapper textarea {
      flex: 1; padding: 8px 12px 8px 2px;
      border: none; border-radius: 20px;
      font-size: var(--font-size, 15px); outline: none; resize: none;
      max-height: 100px; line-height: 1.4;
      font-family: inherit; -webkit-appearance: none;
      background: transparent;
      -webkit-font-smoothing: antialiased;
    }
    .send-btn {
      height: 44px; min-width: 80px; padding: 0 18px;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      color: white; border: none; border-radius: 22px;
      font-size: 14px; font-weight: 600; cursor: pointer; flex-shrink: 0;
      display: flex; align-items: center; justify-content: center; gap: 4px;
      transition: all 0.2s ease;
      position: relative; z-index: 10;
      box-shadow: 0 2px 12px rgba(102,126,234,0.35), 0 0 0 1px rgba(255,255,255,0.1) inset;
    }
    .send-btn:active { transform: scale(0.95); box-shadow: 0 1px 6px rgba(102,126,234,0.25); }
    .send-btn:disabled { opacity: 0.4; }
    .send-btn svg { pointer-events: none; }

    /* ===== 设置面板（侧滑） ===== */
    .settings-overlay {
      position: fixed; top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(0,0,0,0.4);
      z-index: 200; opacity: 0; pointer-events: none;
      transition: opacity 0.3s;
    }
    .settings-overlay.show { opacity: 1; pointer-events: auto; }

    .settings-panel {
      position: fixed; top: 0; right: -320px; bottom: 0;
      width: 300px; max-width: 85vw;
      background: white;
      z-index: 201;
      transition: right 0.3s ease;
      display: flex; flex-direction: column;
      box-shadow: -4px 0 24px rgba(0,0,0,0.12), -1px 0 4px rgba(0,0,0,0.06);
    }
    .settings-panel.show { right: 0; }

    .settings-header {
      padding: 16px 18px;
      padding-top: calc(16px + env(safe-area-inset-top));
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      color: white; display: flex; align-items: center; justify-content: space-between;
    }
    .settings-header h2 { font-size: 17px; font-weight: 600; }
    .settings-header button {
      background: rgba(255,255,255,0.2); border: none; color: white;
      width: 30px; height: 30px; border-radius: 50%;
      font-size: 16px; cursor: pointer;
      display: flex; align-items: center; justify-content: center;
    }

    .settings-body {
      flex: 1; overflow-y: auto; -webkit-overflow-scrolling: touch;
      padding: 16px 18px;
    }

    .setting-group { margin-bottom: 20px; padding: 12px; background: #fafbff; border-radius: 14px; border: 1px solid rgba(0,0,0,0.04); box-shadow: 0 1px 3px rgba(0,0,0,0.03); }
    .setting-group-title {
      font-size: 12px; font-weight: 600; color: #999;
      text-transform: uppercase; letter-spacing: 0.5px;
      margin-bottom: 10px;
    }
    .setting-item {
      display: flex; align-items: center; justify-content: space-between;
      padding: 10px 0;
      border-bottom: 1px solid #f5f5f5;
    }
    .setting-item:last-child { border-bottom: none; }
    .setting-item label { font-size: 14px; color: #333; font-weight: 500; }
    .setting-item .value { display: flex; align-items: center; gap: 8px; }
    .setting-item input[type="text"] {
      width: 120px; padding: 7px 10px;
      border: 1.5px solid #eee; border-radius: 8px;
      font-size: 13px; outline: none; text-align: right;
    }
    .setting-item input[type="text"]:focus { border-color: #667eea; }

    .upload-btn {
      padding: 6px 12px; border-radius: 8px;
      background: #f5f3ff; color: #667eea;
      border: 1.5px solid #e8e3ff; font-size: 12px;
      cursor: pointer; font-weight: 500;
    }
    .upload-btn:active { background: #ebe5ff; }

    /* 安装提示 */
    .install-banner {
      display: none; position: fixed; bottom: 160px;
      left: 16px; right: 16px; background: white;
      border-radius: 14px; padding: 12px 16px;
      box-shadow: 0 8px 32px rgba(0,0,0,0.15);
      z-index: 100; animation: fadeUp 0.3s ease;
    }
    .install-banner.show { display: flex; align-items: center; gap: 10px; }
    .install-banner .ib-icon { font-size: 24px; }
    .install-banner .ib-text { flex: 1; font-size: 12px; color: #555; line-height: 1.4; }
    .install-banner .ib-text b { color: #333; font-size: 13px; display: block; margin-bottom: 2px; }
    .install-banner .ib-btn {
      background: linear-gradient(135deg, #667eea, #764ba2);
      color: white; border: none; padding: 7px 14px;
      border-radius: 8px; font-size: 12px; font-weight: 600;
      cursor: pointer; white-space: nowrap;
    }
    .install-banner .ib-close {
      background: none; border: none; color: #ccc;
      font-size: 18px; cursor: pointer; padding: 4px;
    }

    .hidden-input { display: none; }

    /* ===== 重新生成按钮 ===== */
    .regen-btn {
      display: inline-flex; align-items: center; justify-content: center;
      width: 28px; height: 28px; border-radius: 50%;
      background: rgba(0,0,0,0.06); border: none;
      font-size: 14px; cursor: pointer; margin-top: 4px;
      transition: background 0.2s; flex-shrink: 0;
      align-self: flex-end;
    }
    .regen-btn:active { background: rgba(0,0,0,0.15); }
    .regen-btn:hover { background: rgba(0,0,0,0.12); }


    /* 用户消息气泡可点击 */
    .m.me .txt { cursor: pointer; user-select: none; -webkit-user-select: none; }

    /* ===== 气泡虚化与文字颜色设置 ===== */

    /* ===== 彩虹渐变选择器 ===== */
    .rainbow-picker { margin-top: 10px; padding: 8px 0; }
    .rp-bar {
      position: relative; height: 22px; border-radius: 11px;
      background: linear-gradient(to right, #ff0000, #ff8800, #ffff00, #00ff00, #00ffff, #0000ff, #ff00ff, #ff0000);
      cursor: pointer; touch-action: none;
      box-shadow: inset 0 1px 3px rgba(0,0,0,0.15);
      flex: 1;
    }
    .rp-fine-btn { width:28px;height:28px;border-radius:8px;border:1px solid #ddd;background:#fafafa;font-size:15px;color:#555;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;transition:background 0.2s; }
    .rp-fine-btn:active { background:#eee; }
    .rp-bar-row { display:flex;align-items:center;gap:4px; }
    .rp-quick-row { display:flex;align-items:center;gap:6px;margin-top:6px; }
    .rp-quick-btn { width:24px;height:24px;border-radius:50%;cursor:pointer;border:2px solid #ddd;transition:transform 0.15s,border-color 0.2s; }
    .rp-quick-btn:active { transform:scale(0.9); }
    .rp-pointer {
      position: absolute; top: 50%; width: 8px; height: 28px;
      border-radius: 4px; background: white;
      border: 2.5px solid #333; transform: translate(-50%, -50%);
      box-shadow: 0 1px 6px rgba(0,0,0,0.3);
      pointer-events: none; transition: left 0.05s;
    }
    .rp-brightness {
      position: relative; height: 22px; border-radius: 11px;
      cursor: pointer; touch-action: none;
      box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
      flex: 1;
    }
    .rp-saturation {
      position: relative; height: 22px; border-radius: 11px;
      cursor: pointer; touch-action: none;
      box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
      flex: 1;
    }
    .rp-brightness .rp-pointer { height: 28px; width: 6px; border-radius: 3px; border-width: 2px; }
    .rp-row { display: flex; align-items: center; gap: 8px; margin-top: 6px; }
    .rp-swatch {
      width: 32px; height: 32px; border-radius: 50%;
      border: 2.5px solid #ddd; flex-shrink: 0; transition: background 0.1s;
    }
    .rp-hex { font-size: 12px; color: #999; font-family: monospace; }
    .rp-apply-row { display: flex; gap: 6px; margin-top: 6px; flex-wrap: wrap; }
    .rp-apply-btn {
      padding: 5px 10px; border-radius: 8px;
      border: 1.5px solid #e8e3ff; background: #f5f3ff;
      color: #667eea; font-size: 11px; font-weight: 500;
      cursor: pointer; transition: all 0.15s;
    }
    .rp-apply-btn:active, .rp-apply-btn.active {
      background: #667eea; color: white; border-color: #667eea;
    }

    /* ===== 图片消息 ===== */
    .msg-image {
      max-width: 200px; max-height: 200px;
      border-radius: 12px; cursor: pointer;
      margin-top: 4px; display: block;
    }

    /* 图片全屏查看 */
    .img-fullview {
      position: fixed; top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(0,0,0,0.9); z-index: 999;
      display: flex; align-items: center; justify-content: center;
      cursor: pointer;
    }
    .img-fullview img {
      max-width: 95%; max-height: 95%;
      object-fit: contain;
    }

    /* ===== end CSS ===== */

    /* 自动朗读开关 */
    .toggle-switch {
      position: relative; display: inline-block; width: 48px; height: 26px;
    }
    .toggle-switch input { opacity: 0; width: 0; height: 0; }
    .toggle-slider {
      position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0;
      background: #ccc; border-radius: 26px; transition: 0.2s;
    }
    .toggle-slider:before {
      content: ''; position: absolute; height: 20px; width: 20px;
      left: 3px; bottom: 3px; background: white; border-radius: 50%; transition: 0.2s;
    }
    input:checked + .toggle-slider { background: #667eea; }
    input:checked + .toggle-slider:before { transform: translateX(22px); }
    /* v54: Quick actions FAB removed */

    /* ===== v53: Multi-select mode (fixed) ===== */
    .m { position:relative; }
    .select-check { position:absolute; left:8px; top:50%; transform:translateY(-50%); width:24px; height:24px; border-radius:50%; border:2px solid rgba(255,255,255,0.45); background:rgba(0,0,0,0.25); display:none; align-items:center; justify-content:center; z-index:10; cursor:pointer; transition:all 0.15s; }
    #msgs.multi-select-active .select-check { display:flex; }
    #msgs.multi-select-active { padding-left:0 !important; }
    #msgs.multi-select-active .m { transition:all 0.2s ease; }
    #msgs.multi-select-active .m .txt { margin-left:40px; }
    #msgs.multi-select-active .m.me { justify-content:flex-end; }
    #msgs.multi-select-active .m.me .txt { margin-left:0; margin-right:40px; }
    .select-check.checked { background:#667eea; border-color:#667eea; }
    .select-check.checked::after { content:'✓'; color:white; font-size:13px; font-weight:bold; }
    .multi-select-bar { position:fixed; bottom:0; left:0; right:0; background:rgba(25,25,40,0.97); backdrop-filter:blur(12px); padding:10px 14px; padding-bottom:calc(10px + env(safe-area-inset-bottom)); display:none; align-items:center; gap:8px; z-index:150; border-top:1px solid rgba(255,255,255,0.08); }
    .multi-select-bar.show { display:flex; }
    .multi-select-bar button { padding:9px 16px; border-radius:10px; border:none; font-size:14px; cursor:pointer; font-weight:500; transition:opacity 0.15s; }
    .multi-select-bar button:active { opacity:0.7; }
    .ms-btn-all { background:rgba(255,255,255,0.12); color:#ddd; }
    .ms-btn-delete { background:linear-gradient(135deg,#e74c3c,#c0392b); color:#fff; flex:1; }
    .ms-btn-cancel { background:rgba(255,255,255,0.08); color:#aaa; }
    .ms-count { color:#aaa; font-size:13px; min-width:40px; text-align:center; }

    /* ===== v52: Export button ===== */
    .export-btn-group { display:flex; gap:8px; margin-top:8px; }
    .export-btn { flex:1; padding:10px; border-radius:10px; border:1px solid rgba(102,126,234,0.3); background:rgba(102,126,234,0.08); color:#667eea; font-size:13px; font-weight:600; cursor:pointer; text-align:center; transition:background 0.15s; }
    .export-btn:active { background:rgba(102,126,234,0.18); }

    /* ===== Dark Mode: Element Overrides ===== */
    [data-theme="dark"] #bgLayer { background-color: #1a1a2e; }
    [data-theme="dark"] .card { background: var(--theme-card-bg); }
    [data-theme="dark"] .card h1 { color: var(--theme-card-text); }
    [data-theme="dark"] .field input { background: var(--theme-settings-group-bg); border-color: var(--theme-divider); color: var(--theme-text); }
    [data-theme="dark"] .m.ai .txt { background: var(--theme-bubble-ai-bg); color: var(--theme-bubble-ai-text); box-shadow: 0 2px 8px rgba(0,0,0,0.3); }
    [data-theme="dark"] .db-btn { background: var(--theme-btn-bg); color: var(--theme-btn-text); border-color: var(--theme-btn-border); }
    [data-theme="dark"] .db-btn svg { stroke: var(--theme-btn-text); }
    [data-theme="dark"] .db-btn:active { background: rgba(60,60,90,var(--btn-bg-opacity)); }
    [data-theme="dark"] .input-wrapper { background: var(--theme-input-bg); }
    [data-theme="dark"] .input-wrapper textarea { color: var(--theme-input-text); }
    [data-theme="dark"] .settings-panel { background: var(--theme-settings-bg); color: var(--theme-text); }
    [data-theme="dark"] .settings-body { color: var(--theme-text); }
    [data-theme="dark"] .setting-group { background: var(--theme-settings-group-bg); border-color: var(--theme-settings-border); }
    [data-theme="dark"] .setting-item { border-bottom-color: var(--theme-divider); }
    [data-theme="dark"] .setting-item label { color: var(--theme-text); }
    [data-theme="dark"] .setting-item input[type="text"] { background: var(--theme-settings-group-bg); border-color: var(--theme-divider); color: var(--theme-text); }
    [data-theme="dark"] .setting-item textarea { background: var(--theme-settings-group-bg); border-color: var(--theme-divider); color: var(--theme-text); }
    [data-theme="dark"] .char-dropdown { background: var(--theme-char-dropdown-bg); }
    [data-theme="dark"] .char-dropdown-item { color: var(--theme-char-dropdown-text); }
    [data-theme="dark"] .char-dropdown-item:active { background: rgba(255,255,255,0.05); }
    [data-theme="dark"] .add-char-btn { background: rgba(102,126,234,0.15); color: #8ea4f0; }
    [data-theme="dark"] .edit-banner { background: var(--theme-edit-banner-bg); border-top-color: rgba(102,126,234,0.1); }
    [data-theme="dark"] .edit-banner-label { color: #8ea4f0; }
    [data-theme="dark"] .edit-banner-preview { color: var(--theme-text-secondary); }
    [data-theme="dark"] .dots span { background: #666; }
    [data-theme="dark"] .setting-group-title { color: var(--theme-text-secondary); }
    [data-theme="dark"] .rp-fine-btn { background: var(--theme-settings-group-bg); border-color: var(--theme-divider); color: var(--theme-text); }
    [data-theme="dark"] .fine-btn { background: var(--theme-settings-group-bg) !important; border-color: var(--theme-divider) !important; color: var(--theme-text) !important; }
    [data-theme="dark"] .upload-btn { background: rgba(102,126,234,0.12); border-color: rgba(102,126,234,0.2); color: #8ea4f0; }
    [data-theme="dark"] .export-btn { background: rgba(102,126,234,0.12); border-color: rgba(102,126,234,0.2); color: #8ea4f0; }
    [data-theme="dark"] .help-box { background: rgba(102,126,234,0.08); color: var(--theme-text-secondary); }
    [data-theme="dark"] .install-banner { background: var(--theme-card-bg); }
    [data-theme="dark"] .install-banner .ib-text { color: var(--theme-text-secondary); }
    [data-theme="dark"] .install-banner .ib-text b { color: var(--theme-text); }

    /* ===== Media query dark mode overrides ===== */
    @media (prefers-color-scheme: dark) {
      :root:not([data-theme="light"]) #bgLayer { background-color: #1a1a2e; }
      :root:not([data-theme="light"]) .card { background: var(--theme-card-bg); }
      :root:not([data-theme="light"]) .card h1 { color: var(--theme-card-text); }
      :root:not([data-theme="light"]) .field input { background: var(--theme-settings-group-bg); border-color: var(--theme-divider); color: var(--theme-text); }
      :root:not([data-theme="light"]) .m.ai .txt { background: var(--theme-bubble-ai-bg); color: var(--theme-bubble-ai-text); box-shadow: 0 2px 8px rgba(0,0,0,0.3); }
      :root:not([data-theme="light"]) .db-btn { background: var(--theme-btn-bg); color: var(--theme-btn-text); border-color: var(--theme-btn-border); }
      :root:not([data-theme="light"]) .db-btn svg { stroke: var(--theme-btn-text); }
      :root:not([data-theme="light"]) .db-btn:active { background: rgba(60,60,90,var(--btn-bg-opacity)); }
      :root:not([data-theme="light"]) .input-wrapper { background: var(--theme-input-bg); }
      :root:not([data-theme="light"]) .input-wrapper textarea { color: var(--theme-input-text); }
      :root:not([data-theme="light"]) .settings-panel { background: var(--theme-settings-bg); color: var(--theme-text); }
      :root:not([data-theme="light"]) .settings-body { color: var(--theme-text); }
      :root:not([data-theme="light"]) .setting-group { background: var(--theme-settings-group-bg); border-color: var(--theme-settings-border); }
      :root:not([data-theme="light"]) .setting-item { border-bottom-color: var(--theme-divider); }
      :root:not([data-theme="light"]) .setting-item label { color: var(--theme-text); }
      :root:not([data-theme="light"]) .setting-item input[type="text"] { background: var(--theme-settings-group-bg); border-color: var(--theme-divider); color: var(--theme-text); }
      :root:not([data-theme="light"]) .setting-item textarea { background: var(--theme-settings-group-bg); border-color: var(--theme-divider); color: var(--theme-text); }
      :root:not([data-theme="light"]) .char-dropdown { background: var(--theme-char-dropdown-bg); }
      :root:not([data-theme="light"]) .char-dropdown-item { color: var(--theme-char-dropdown-text); }
      :root:not([data-theme="light"]) .char-dropdown-item:active { background: rgba(255,255,255,0.05); }
      :root:not([data-theme="light"]) .add-char-btn { background: rgba(102,126,234,0.15); color: #8ea4f0; }
      :root:not([data-theme="light"]) .edit-banner { background: var(--theme-edit-banner-bg); border-top-color: rgba(102,126,234,0.1); }
      :root:not([data-theme="light"]) .edit-banner-label { color: #8ea4f0; }
      :root:not([data-theme="light"]) .edit-banner-preview { color: var(--theme-text-secondary); }
      :root:not([data-theme="light"]) .dots span { background: #666; }
      :root:not([data-theme="light"]) .setting-group-title { color: var(--theme-text-secondary); }
      :root:not([data-theme="light"]) .rp-fine-btn { background: var(--theme-settings-group-bg); border-color: var(--theme-divider); color: var(--theme-text); }
      :root:not([data-theme="light"]) .fine-btn { background: var(--theme-settings-group-bg) !important; border-color: var(--theme-divider) !important; color: var(--theme-text) !important; }
      :root:not([data-theme="light"]) .upload-btn { background: rgba(102,126,234,0.12); border-color: rgba(102,126,234,0.2); color: #8ea4f0; }
      :root:not([data-theme="light"]) .export-btn { background: rgba(102,126,234,0.12); border-color: rgba(102,126,234,0.2); color: #8ea4f0; }
      :root:not([data-theme="light"]) .help-box { background: rgba(102,126,234,0.08); color: var(--theme-text-secondary); }
      :root:not([data-theme="light"]) .install-banner { background: var(--theme-card-bg); }
      :root:not([data-theme="light"]) .install-banner .ib-text { color: var(--theme-text-secondary); }
      :root:not([data-theme="light"]) .install-banner .ib-text b { color: var(--theme-text); }
    }

    /* ===== Phase 3: Message Timestamps ===== */
    .msg-time {
      font-size: 11px;
      color: var(--theme-text-muted, #aaa);
      margin-top: 4px;
      padding: 0 4px;
      opacity: 0.7;
      line-height: 1;
    }
    .m.me .msg-time { text-align: right; }
    .m.ai .msg-time { text-align: left; }

    /* ===== Phase 3: Search Bar ===== */
    .search-bar {
      display: none;
      align-items: center;
      gap: 8px;
      padding: 6px 10px;
      background: var(--theme-search-bg, rgba(255,255,255,0.95));
      border-top: 1px solid var(--theme-search-border, rgba(0,0,0,0.1));
    }
    .search-bar.show { display: flex; }
    .search-bar input {
      flex: 1;
      padding: 8px 12px;
      border: 1.5px solid var(--theme-search-border, rgba(0,0,0,0.15));
      border-radius: 20px;
      font-size: 14px;
      outline: none;
      background: transparent;
      color: var(--theme-search-text, #333);
    }
    .search-bar input:focus { border-color: #667eea; }
    .search-bar input::placeholder { color: var(--theme-text-muted, #aaa); }
    .search-bar .search-count {
      font-size: 12px;
      color: var(--theme-text-secondary, #888);
      min-width: 50px;
      text-align: center;
      white-space: nowrap;
    }
    .search-bar .search-close-btn {
      width: 28px; height: 28px;
      border-radius: 50%;
      border: none;
      background: rgba(0,0,0,0.06);
      color: var(--theme-text-secondary, #888);
      font-size: 14px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }
    [data-theme="dark"] .search-bar .search-close-btn { background: rgba(255,255,255,0.1); }
    .search-highlight {
      background: rgba(255, 213, 0, 0.4);
      border-radius: 2px;
      padding: 0 1px;
    }
    [data-theme="dark"] .search-highlight { background: rgba(255, 213, 0, 0.25); }
    .m.search-dimmed { opacity: 0.2; transition: opacity 0.2s; }

    /* ===== Phase 3: Toast Types ===== */
    .toast-info { background: rgba(52, 152, 219, 0.9) !important; }
    .toast-success { background: rgba(39, 174, 96, 0.9) !important; }
    .toast-error { background: rgba(231, 76, 60, 0.9) !important; }
    .toast-warning { background: rgba(241, 196, 15, 0.9) !important; color: #333 !important; }

    /* ===== Phase 3: Char Menu Import/Export ===== */
    .char-menu-action {
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 10px 16px;
      cursor: pointer;
      font-size: 13px;
      color: #667eea;
      border-top: 1px solid #f0f0f0;
      transition: background 0.15s;
    }
    .char-menu-action:active { background: #f5f5f5; }
    [data-theme="dark"] .char-menu-action { color: #8ea4f0; border-top-color: var(--theme-divider); }
    [data-theme="dark"] .char-menu-action:active { background: rgba(255,255,255,0.05); }