*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

    /* ── Dark theme (default) ── */
    html{
      --bg:#121212;--bg2:#1c1c1c;--surface:#242424;--surface-raised:#2e2e2e;
      --border:rgba(255,255,255,.1);--border-strong:rgba(255,255,255,.2);
      --text:#f2f2f2;--muted:#888888;
      --input-bg:rgba(255,255,255,.06);--card-bg:rgba(255,255,255,.04);
      --header-bg:rgba(18,18,18,.92);--modal-bg:#1c1c1c;
      --btn-primary-bg:#efefef;--btn-primary-text:#111111;
      --btn-secondary-bg:rgba(255,255,255,.07);--btn-secondary-border:rgba(255,255,255,.13);
      --cover-ph:#2c2c2c;--cover-ph-text:rgba(255,255,255,.18);
      --series-color:#b0b0b0;--tag-bg:rgba(255,255,255,.07);--tag-border:rgba(255,255,255,.12);
      --scrollbar:rgba(255,255,255,.18);--shadow:rgba(0,0,0,.55);
      --logo-from:#d0d0d0;--logo-to:#ffffff;
      --status-info-bg:rgba(100,181,246,.1);--status-info-border:rgba(100,181,246,.25);
      --status-info-text:#7ec8f8;
      --status-error-bg:rgba(255,82,82,.1);--status-error-border:rgba(255,82,82,.25);
      --status-error-text:#ff8a80;
      --radius:10px;--transition:.18s ease;
    }
    /* ── Light theme — applied when system prefers light and no manual override ── */
    @media(prefers-color-scheme:light){
      html:not([data-theme]){
        --bg:#f0f0f0;--bg2:#ffffff;--surface:#e4e4e4;--surface-raised:#ffffff;
        --border:rgba(0,0,0,.1);--border-strong:rgba(0,0,0,.2);
        --text:#1a1a1a;--muted:#636363;
        --input-bg:rgba(0,0,0,.04);--card-bg:rgba(0,0,0,.03);
        --header-bg:rgba(240,240,240,.92);--modal-bg:#ffffff;
        --btn-primary-bg:#1a1a1a;--btn-primary-text:#ffffff;
        --btn-secondary-bg:rgba(0,0,0,.05);--btn-secondary-border:rgba(0,0,0,.12);
        --cover-ph:#d4d4d4;--cover-ph-text:rgba(0,0,0,.2);
        --series-color:#555555;--tag-bg:rgba(0,0,0,.05);--tag-border:rgba(0,0,0,.1);
        --scrollbar:rgba(0,0,0,.2);--shadow:rgba(0,0,0,.12);
        --logo-from:#333333;--logo-to:#000000;
        --status-info-bg:rgba(30,120,190,.08);--status-info-border:rgba(30,120,190,.2);
        --status-info-text:#1565c0;
        --status-error-bg:rgba(200,0,0,.07);--status-error-border:rgba(200,0,0,.2);
        --status-error-text:#c62828;
      }
    }
    /* ── Manual light override ── */
    html[data-theme='light']{
      --bg:#f0f0f0;--bg2:#ffffff;--surface:#e4e4e4;--surface-raised:#ffffff;
      --border:rgba(0,0,0,.1);--border-strong:rgba(0,0,0,.2);
      --text:#1a1a1a;--muted:#636363;
      --input-bg:rgba(0,0,0,.04);--card-bg:rgba(0,0,0,.03);
      --header-bg:rgba(240,240,240,.92);--modal-bg:#ffffff;
      --btn-primary-bg:#1a1a1a;--btn-primary-text:#ffffff;
      --btn-secondary-bg:rgba(0,0,0,.05);--btn-secondary-border:rgba(0,0,0,.12);
      --cover-ph:#d4d4d4;--cover-ph-text:rgba(0,0,0,.2);
      --series-color:#555555;--tag-bg:rgba(0,0,0,.05);--tag-border:rgba(0,0,0,.1);
      --scrollbar:rgba(0,0,0,.2);--shadow:rgba(0,0,0,.12);
      --logo-from:#333333;--logo-to:#000000;
      --status-info-bg:rgba(30,120,190,.08);--status-info-border:rgba(30,120,190,.2);
      --status-info-text:#1565c0;
      --status-error-bg:rgba(200,0,0,.07);--status-error-border:rgba(200,0,0,.2);
      --status-error-text:#c62828;
    }
    /* ── Sepia theme ── */
    html[data-theme='sepia']{
      --bg:#f3ead3;--bg2:#faf4e4;--surface:#ede3c8;--surface-raised:#faf4e4;
      --border:rgba(100,70,30,.15);--border-strong:rgba(100,70,30,.28);
      --text:#3b2a1a;--muted:#7a6040;
      --input-bg:rgba(100,70,30,.06);--card-bg:rgba(100,70,30,.04);
      --header-bg:rgba(243,234,211,.92);--modal-bg:#faf4e4;
      --btn-primary-bg:#4a3320;--btn-primary-text:#faf4e4;
      --btn-secondary-bg:rgba(100,70,30,.07);--btn-secondary-border:rgba(100,70,30,.15);
      --cover-ph:#dfd5be;--cover-ph-text:rgba(60,40,10,.2);
      --series-color:#7a6040;--tag-bg:rgba(100,70,30,.07);--tag-border:rgba(100,70,30,.14);
      --scrollbar:rgba(100,70,30,.25);--shadow:rgba(80,50,10,.18);
      --logo-from:#6b4c24;--logo-to:#3b2a1a;
      --status-info-bg:rgba(90,130,80,.1);--status-info-border:rgba(90,130,80,.25);
      --status-info-text:#4a7c40;
      --status-error-bg:rgba(180,60,10,.1);--status-error-border:rgba(180,60,10,.25);
      --status-error-text:#b83c0a;
    }

    body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
      background:var(--bg);color:var(--text);min-height:100vh;
      transition:background .22s ease,color .22s ease;}
    a{color:inherit}
    button{cursor:pointer;font-family:inherit}

    /* ── Header ── */
    header{
      position:sticky;top:0;z-index:100;
      background:var(--header-bg);backdrop-filter:blur(12px);
      border-bottom:1px solid var(--border);padding:14px 24px;
    }
    .header-row{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
    .logo-group{display:flex;align-items:center;gap:10px;flex-shrink:0}
    .logo-group h1{font-size:1.35rem;
      background:linear-gradient(135deg,var(--logo-from),var(--logo-to));
      -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
    .logo-icon{font-size:1.4rem}
    /* ── Sources button (in header-actions) ── */
    .btn-sources{display:inline-flex;align-items:center;gap:7px;
      padding:7px 14px;background:var(--btn-secondary-bg);
      border:1px solid var(--btn-secondary-border);border-radius:8px;
      color:var(--text);font-size:.85rem;font-weight:600;white-space:nowrap;
      transition:border-color var(--transition),background var(--transition)}
    .btn-sources:hover{background:var(--surface-raised);border-color:var(--border-strong)}
    /* ── Sources manager modal ── */
    .sources-modal-box{
      max-width:660px;display:flex;flex-direction:column;
      max-height:85vh;overflow:hidden;
    }
    .sources-modal-box.modal-box{overflow:hidden}
    .sources-modal-header{
      display:flex;align-items:center;justify-content:space-between;
      padding:20px 24px 16px;border-bottom:1px solid var(--border);flex-shrink:0;
    }
    .sources-modal-title{font-size:1.05rem;font-weight:700}
    .sources-modal-toolbar{
      display:flex;align-items:center;gap:8px;
      padding:14px 16px;border-bottom:1px solid var(--border);
      flex-wrap:wrap;flex-shrink:0;
    }
    .sources-modal-toolbar .btn-primary{margin-left:auto}
    .src-import-panel{
      padding:14px 16px;border-bottom:1px solid var(--border);
      flex-shrink:0;display:none;
    }
    .src-import-panel.show{display:block}
    .src-import-ta{
      min-height:90px;resize:vertical;
      font-family:ui-monospace,"Cascadia Code",monospace;font-size:.78rem;
    }
    #srcList{overflow-y:auto;flex:1}
    .src-panel-header{padding:14px 16px 10px;
      font-size:.72rem;font-weight:700;letter-spacing:.07em;
      text-transform:uppercase;color:var(--muted);border-bottom:1px solid var(--border)}
    .src-empty{padding:20px 16px;color:var(--muted);font-size:.85rem;text-align:center}
    .src-row{
      display:grid;
      grid-template-columns:1fr auto;
      align-items:start;
      gap:8px;
      padding:12px 16px;
      border-bottom:1px solid var(--border);
    }
    .src-row:last-of-type{border-bottom:none}
    .src-info{min-width:0}
    .src-name{font-weight:600;font-size:.88rem;
      white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .src-url{font-size:.73rem;color:var(--muted);margin-top:2px;
      white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .src-count{font-size:.72rem;margin-top:4px;
      display:inline-flex;align-items:center;gap:4px}
    .src-count-badge{background:var(--tag-bg);border:1px solid var(--border);
      border-radius:100px;padding:1px 8px;font-size:.7rem}
    .src-count-loading{color:var(--muted)}
    .src-actions{display:flex;align-items:center;gap:4px;flex-shrink:0;padding-top:2px}
    .src-btn{background:none;border:1px solid var(--border);border-radius:6px;
      color:var(--muted);padding:4px 8px;font-size:.75rem;line-height:1.4;
      transition:background var(--transition),color var(--transition),border-color var(--transition)}
    .src-btn:hover{background:var(--tag-bg);color:var(--text);border-color:var(--border-strong)}
    .src-panel-footer{padding:12px 16px;border-top:1px solid var(--border)}
    .header-actions{display:flex;align-items:center;gap:8px;margin-left:auto;flex-shrink:0}
    .theme-select{padding:7px 10px;background:var(--btn-secondary-bg);
      border:1px solid var(--btn-secondary-border);
      border-radius:8px;color:var(--text);font-size:.8rem;outline:none;cursor:pointer;
      transition:border-color var(--transition)}
    .theme-select:hover{border-color:var(--border-strong)}
    .theme-select option{background:var(--modal-bg)}
    .btn-add{background:var(--btn-primary-bg);border:none;
      color:var(--btn-primary-text);padding:8px 18px;border-radius:8px;
      font-size:.85rem;font-weight:600;
      transition:opacity var(--transition);white-space:nowrap;}
    .btn-add:hover{opacity:.75}

    /* ── Toolbar ── */
    .toolbar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:16px 24px 0}
    .search-wrap{position:relative;flex:1;min-width:200px}
    .search-wrap::before{content:'🔍';position:absolute;left:12px;top:50%;
      transform:translateY(-50%);pointer-events:none;font-size:.9rem}
    #searchInput{width:100%;padding:9px 14px 9px 36px;
      background:var(--input-bg);border:1px solid var(--border);
      border-radius:8px;color:var(--text);font-size:.9rem;outline:none;
      transition:border-color var(--transition)}
    #searchInput:focus{border-color:var(--border-strong)}
    #searchInput::placeholder{color:var(--muted)}
    select{padding:9px 14px;background:var(--input-bg);
      border:1px solid var(--border);border-radius:8px;
      color:var(--text);font-size:.85rem;outline:none;cursor:pointer}
    select option{background:var(--modal-bg)}
    .book-count{color:var(--muted);font-size:.82rem;white-space:nowrap}

    /* ── Status banner ── */
    .status-banner{margin:14px 24px 0;padding:10px 16px;border-radius:8px;
      font-size:.85rem;display:none}
    .status-banner.info{background:var(--status-info-bg);border:1px solid var(--status-info-border);color:var(--status-info-text)}
    .status-banner.error{background:var(--status-error-bg);border:1px solid var(--status-error-border);color:var(--status-error-text)}
    .status-banner.show{display:block}

    /* ── Grid ── */
    .book-grid{
      display:grid;
      grid-template-columns:repeat(auto-fill,minmax(160px,1fr));
      gap:18px;padding:18px 24px;
    }
    .book-card{
      background:var(--card-bg);border:1px solid var(--border);
      border-radius:var(--radius);overflow:hidden;cursor:pointer;
      transition:transform var(--transition),border-color var(--transition),
        box-shadow var(--transition);display:flex;flex-direction:column;
    }
    .book-card:hover{transform:translateY(-4px);border-color:var(--border-strong);
      box-shadow:0 8px 28px var(--shadow)}
    .cover-wrap{width:100%;aspect-ratio:2/3;overflow:hidden;flex-shrink:0;position:relative}
    .cover-wrap img,.cover-placeholder{width:100%;height:100%;object-fit:cover;display:block}
    .cover-placeholder{
      display:flex;align-items:center;justify-content:center;
      font-size:3rem;font-weight:700;color:var(--cover-ph-text);
      background:var(--cover-ph);
    }
    .book-info{padding:10px 10px 12px;flex:1;display:flex;flex-direction:column;gap:4px}
    .book-title{font-size:.82rem;font-weight:600;line-height:1.3;
      display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
    .book-author{font-size:.73rem;color:var(--muted);
      white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .book-series{font-size:.68rem;color:var(--series-color);margin-top:auto;padding-top:4px;
      white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .book-card-dl{margin-top:8px;padding:5px 0;width:100%;
      background:var(--tag-bg);border:1px solid var(--border);
      border-radius:6px;font-size:.75rem;color:var(--text);
      transition:background var(--transition)}
    .book-card-dl:hover{background:var(--surface-raised)}

    /* ── Empty / Loading state ── */
    .empty-state{text-align:center;padding:80px 24px;color:var(--muted);display:none}
    .empty-state.show{display:block}
    .empty-icon{font-size:4rem;margin-bottom:16px}
    .empty-title{font-size:1.1rem;margin-bottom:8px;color:var(--text)}
    .empty-sub{font-size:.9rem}

    /* ── Pagination ── */
    .pagination{display:flex;justify-content:center;align-items:center;
      gap:6px;padding:20px 24px 32px;flex-wrap:wrap}
    .page-btn{min-width:36px;height:36px;padding:0 8px;
      background:var(--card-bg);border:1px solid var(--border);
      border-radius:6px;color:var(--text);font-size:.85rem;
      transition:background var(--transition),border-color var(--transition)}
    .page-btn:hover,.page-btn.active{background:var(--tag-bg);border-color:var(--border-strong)}
    .page-btn.active{font-weight:700}
    .page-dots{color:var(--muted);padding:0 4px}

    /* ── Modals (shared) ── */
    .overlay{position:fixed;inset:0;background:rgba(0,0,0,.55);
      backdrop-filter:blur(4px);z-index:200;display:flex;
      align-items:center;justify-content:center;padding:20px;opacity:0;
      pointer-events:none;transition:opacity .22s ease}
    .overlay.open{opacity:1;pointer-events:all}
    .modal-box{background:var(--modal-bg);border:1px solid var(--border);
      border-radius:14px;max-height:90vh;overflow-y:auto;width:100%;
      transform:translateY(12px);transition:transform .22s ease;
      box-shadow:0 24px 64px var(--shadow);}
    .overlay.open .modal-box{transform:none}

    /* ── Book detail modal ── */
    .book-modal-box{max-width:600px}
    .bm-inner{display:flex;gap:24px;padding:28px;align-items:flex-start}
    @media(max-width:520px){.bm-inner{flex-direction:column}.bm-cover{align-self:center}}
    .bm-cover{flex-shrink:0;width:140px;border-radius:8px;overflow:hidden;
      box-shadow:0 6px 24px rgba(0,0,0,.5)}
    .bm-cover img,.bm-cover .bm-cover-ph{width:140px;height:210px;object-fit:cover;display:block}
    .bm-cover-ph{background:var(--cover-ph);
      display:flex;align-items:center;justify-content:center;
      font-size:2.5rem;font-weight:700;color:var(--cover-ph-text)}
    .bm-meta{flex:1;min-width:0}
    .bm-title{font-size:1.2rem;font-weight:700;line-height:1.3;margin-bottom:6px}
    .bm-author{color:var(--series-color);font-size:.9rem;margin-bottom:14px}
    .meta-row{display:flex;gap:8px;font-size:.82rem;margin-bottom:6px;align-items:baseline}
    .meta-label{color:var(--muted);flex-shrink:0;width:90px}
    .meta-value{color:var(--text)}
    .bm-formats{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
    .btn-dl{display:inline-flex;align-items:center;gap:7px;
      padding:9px 18px;border-radius:8px;font-size:.85rem;font-weight:600;
      border:none;color:var(--btn-primary-text);background:var(--btn-primary-bg);
      transition:opacity var(--transition),transform var(--transition)}
    .btn-dl:hover{opacity:.75;transform:translateY(-1px)}
    .btn-dl:disabled{opacity:.45;transform:none;cursor:wait}
    .btn-read{text-decoration:none;cursor:pointer}
    .btn-read:hover{opacity:.75;transform:translateY(-1px)}
    .bm-close{position:absolute;top:14px;right:14px;background:none;border:none;
      color:var(--muted);font-size:1.4rem;line-height:1;padding:4px;
      transition:color var(--transition)}
    .bm-close:hover{color:var(--text)}
    .modal-box{position:relative}
    .bm-source-tag{display:inline-block;background:var(--tag-bg);
      border:1px solid var(--tag-border);border-radius:100px;
      padding:2px 10px;font-size:.72rem;color:var(--muted);margin-bottom:8px}

    /* ── Add-source dialog ── */
    .dlg-box{max-width:500px;padding:28px}
    .dlg-title{font-size:1.05rem;font-weight:700;margin-bottom:18px;
      display:flex;align-items:center;gap:8px}
    .dlg-label{font-size:.82rem;color:var(--muted);margin-bottom:7px;display:block}
    .dlg-input{width:100%;padding:10px 14px;
      background:var(--input-bg);border:1px solid var(--border);
      border-radius:8px;color:var(--text);font-size:.9rem;outline:none;
      transition:border-color var(--transition)}
    .dlg-input:focus{border-color:var(--border-strong)}
    .dlg-input::placeholder{color:var(--muted)}
    .dlg-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:20px;flex-wrap:wrap}
    .btn-secondary{padding:8px 18px;border-radius:8px;background:var(--btn-secondary-bg);
      border:1px solid var(--btn-secondary-border);color:var(--text);font-size:.85rem;
      transition:background var(--transition)}
    .btn-secondary:hover{background:var(--surface-raised)}
    .btn-primary{padding:8px 20px;border-radius:8px;border:none;
      background:var(--btn-primary-bg);color:var(--btn-primary-text);
      font-size:.85rem;font-weight:600;transition:opacity var(--transition)}
    .btn-primary:hover{opacity:.75}
    .btn-primary:disabled{opacity:.45;cursor:not-allowed}
    .preview-box{margin-top:16px;padding:14px;background:var(--tag-bg);
      border:1px solid var(--border);border-radius:8px;display:none}
    .preview-box.show{display:block}
    .preview-name{font-weight:600;font-size:.95rem;margin-bottom:4px}
    .preview-count{font-size:.8rem;color:var(--muted)}
    .linked-list{margin-top:12px;display:flex;flex-direction:column;gap:8px}
    .linked-item{display:flex;align-items:center;gap:10px;font-size:.82rem}
    .linked-item input[type=checkbox]{width:15px;height:15px;accent-color:var(--btn-primary-bg);flex-shrink:0}
    .linked-name{font-weight:600}
    .linked-url{color:var(--muted);font-size:.74rem;
      white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:260px}
    .linked-already{font-size:.72rem;color:#81c784;margin-left:auto;flex-shrink:0}
    .error-msg{color:var(--status-error-text);font-size:.82rem;margin-top:10px;display:none}
    .error-msg.show{display:block}
    .spinner{display:inline-block;width:16px;height:16px;
      border:2px solid rgba(128,128,128,.35);border-top-color:currentColor;
      border-radius:50%;animation:spin .6s linear infinite;vertical-align:middle}
    @keyframes spin{to{transform:rotate(360deg)}}
    .dl-prog-wrap{position:relative;display:inline-flex;align-items:center;
      min-width:170px;height:1.15em;background:rgba(0,0,0,.18);
      border-radius:4px;overflow:hidden}
    .dl-prog-bar{position:absolute;left:0;top:0;height:100%;
      background:rgba(255,255,255,.32);border-radius:4px;
      transition:width .12s linear}
    .dl-prog-label{position:relative;z-index:1;font-size:.8rem;
      white-space:nowrap;padding:0 8px;letter-spacing:.01em}
    .key-dlg-desc{font-size:.88rem;color:var(--text);margin-bottom:14px;line-height:1.5}
    .hint{font-size:.77rem;color:var(--muted);margin-top:6px}
    .hint code{background:var(--tag-bg);border:1px solid var(--border);
      border-radius:4px;padding:1px 5px;font-size:.76rem;color:var(--text)}

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