/* Extracted from Chemkeys_v1.8.3.html. Keep behavior-preserving edits small and intentional. */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    :root {
      --bg: #0f1117; --surface: #181b28; --surface2: #1f2236; --surface3: #262b45;
      --accent: #6c63ff; --accent2: #9189ff; --accent-glow: rgba(108,99,255,0.22);
      --text: #e8eaf6; --text2: #9da3be; --text3: #5e6480;
      --green: #4caf87; --red: #e05c5c; --yellow: #f0c040; --orange: #f0a04b;
      --border: rgba(108,99,255,0.16); --radius: 14px; --radius-sm: 8px;
    }
    body { background: var(--bg); color: var(--text); font-family: 'Segoe UI', system-ui, sans-serif; min-height: 100vh; font-size: 15px; }
    ::-webkit-scrollbar { width: 5px; } ::-webkit-scrollbar-thumb { background: var(--surface3); border-radius: 3px; }
    #root { min-height: 100vh; display: flex; flex-direction: column; }

    .app-header { background: var(--surface); border-bottom: 1px solid var(--border); padding: 13px 22px; display: flex; align-items: center; gap: 12px; position: sticky; top: 0; z-index: 50; }
    .hdr-logo { font-size: 1.5rem; }
    .hdr-text { flex: 1; }
    .hdr-text h1 { font-size: 1.1rem; font-weight: 700; background: linear-gradient(130deg,#fff 0%,var(--accent2) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
    .hdr-sub { font-size: 0.7rem; color: var(--text3); margin-top: 1px; }
    .login-btn { background: var(--surface2); border: 1px solid var(--border); border-radius: 50%; width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; cursor: pointer; font-size: 1rem; color: var(--text2); transition: all .18s; }
    .login-btn:hover { border-color: var(--accent); color: var(--accent2); background: var(--surface3); }

    .tab-bar { background: var(--surface); border-bottom: 1px solid var(--border); display: flex; padding: 0 22px; gap: 2px; overflow-x: auto; scrollbar-width: none; }
    .tab-bar::-webkit-scrollbar { display: none; }
    .tab-btn { background: none; border: none; color: var(--text3); padding: 12px 17px 10px; cursor: pointer; font-size: 0.85rem; font-weight: 500; border-bottom: 2px solid transparent; transition: all .18s; white-space: nowrap; font-family: inherit; }
    .tab-btn:hover { color: var(--text); }
    .tab-btn.active { color: var(--accent2); border-bottom-color: var(--accent); }

    .main { flex: 1; padding: 22px; max-width: 1280px; margin: 0 auto; width: 100%; }

    .panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; margin-bottom: 14px; }
    .panel-title { font-size: 0.88rem; font-weight: 700; margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }

    .toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 14px; }
    .spacer { flex: 1; }
    .filter-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 16px; }
    .filter-row select, .search-input { background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); padding: 7px 11px; font-size: 0.83rem; font-family: inherit; outline: none; cursor: pointer; transition: border-color .15s; }
    .filter-row select:focus, .search-input:focus { border-color: var(--accent); }
    .search-input { flex: 1; min-width: 130px; cursor: text; }
    .count-lbl { font-size: 0.76rem; color: var(--text3); white-space: nowrap; }

    .btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 8px 15px; border-radius: var(--radius-sm); font-size: 0.84rem; font-weight: 600; cursor: pointer; border: none; transition: all .15s; font-family: inherit; line-height: 1.2; }
    .btn-primary { background: var(--accent); color: #fff; }
    .btn-primary:hover { background: var(--accent2); transform: translateY(-1px); }
    .btn-secondary { background: var(--surface2); color: var(--text); border: 1px solid var(--border); }
    .btn-secondary:hover { background: var(--surface3); border-color: rgba(108,99,255,0.4); }
    .btn-danger { background: rgba(224,92,92,0.1); color: var(--red); border: 1px solid rgba(224,92,92,0.22); }
    .btn-danger:hover { background: rgba(224,92,92,0.2); }
    .btn-success { background: rgba(76,175,135,0.1); color: var(--green); border: 1px solid rgba(76,175,135,0.22); }
    .btn-success:hover { background: rgba(76,175,135,0.2); }
    .btn-ghost { background: none; color: var(--accent2); border: 1px dashed rgba(108,99,255,0.3); }
    .btn-ghost:hover { background: var(--accent-glow); }
    .btn-sm { padding: 5px 10px; font-size: 0.76rem; }
    .btn:disabled { opacity: 0.35; cursor: not-allowed; transform: none !important; }

    .badge { display: inline-flex; align-items: center; padding: 2px 8px; border-radius: 20px; font-size: 0.68rem; font-weight: 700; border: 1px solid; letter-spacing: .03em; }
    .badge-type { background: rgba(108,99,255,0.1); color: var(--accent2); border-color: rgba(108,99,255,0.22); }
    .badge-leicht { background: rgba(76,175,135,0.1); color: var(--green); border-color: rgba(76,175,135,0.22); }
    .badge-mittel { background: rgba(240,192,64,0.1); color: var(--yellow); border-color: rgba(240,192,64,0.22); }
    .badge-schwer { background: rgba(224,92,92,0.1); color: var(--red); border-color: rgba(224,92,92,0.22); }
    .badge-cycle { background: rgba(91,192,235,0.1); color: #5bc0eb; border-color: rgba(91,192,235,0.25); }
    .named-tag { display: inline-flex; padding: 2px 8px; border-radius: 20px; font-size: 0.68rem; font-weight: 600; background: rgba(240,160,75,0.12); color: var(--orange); border: 1px solid rgba(240,160,75,0.25); margin-left: 7px; }

    .modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.72); z-index: 200; display: flex; align-items: flex-start; justify-content: center; padding: 20px; overflow-y: auto; }
    .modal { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px 24px; width: 100%; max-width: 560px; margin: auto; }
    .modal-wide { max-width: 780px; }
    .modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
    .modal-title { font-size: 1rem; font-weight: 700; }
    .modal-close { background: none; border: none; color: var(--text3); cursor: pointer; font-size: 1.2rem; padding: 3px 8px; border-radius: 5px; transition: all .15s; font-family: inherit; }
    .modal-close:hover { background: var(--surface2); color: var(--text); }

    .alert { padding: 10px 15px; border-radius: var(--radius-sm); font-size: 0.83rem; margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
    .alert-success { background: rgba(76,175,135,0.1); border: 1px solid rgba(76,175,135,0.28); color: var(--green); }
    .alert-error { background: rgba(224,92,92,0.1); border: 1px solid rgba(224,92,92,0.28); color: var(--red); }
    .alert-info { background: rgba(108,99,255,0.1); border: 1px solid rgba(108,99,255,0.28); color: var(--accent2); }

    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; }
    .form-grid .full { grid-column: 1/-1; }
    .form-group { display: flex; flex-direction: column; gap: 5px; }
    .form-group label { font-size: 0.72rem; font-weight: 600; color: var(--text2); text-transform: uppercase; letter-spacing: .05em; }
    .form-group input, .form-group select, .form-group textarea { background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); padding: 9px 11px; font-size: 0.86rem; font-family: inherit; transition: border-color .15s; outline: none; }
    .form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
    .form-group select option { background: var(--surface2); }
    .form-group textarea { resize: vertical; min-height: 64px; }
    .check-label { display: flex; align-items: center; gap: 8px; font-size: 0.86rem; color: var(--text2); cursor: pointer; }
    .check-label input[type=checkbox] { width: 15px; height: 15px; accent-color: var(--accent); cursor: pointer; }

    .reaction-list { display: flex; flex-direction: column; gap: 9px; }
    .reaction-item { background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 13px 15px; display: flex; align-items: flex-start; gap: 11px; transition: border-color .15s, box-shadow .15s; }
    .reaction-item.last-edited { border-color: rgba(255,255,255,0.75); box-shadow: 0 0 0 2px rgba(255,255,255,0.18), 0 0 12px 2px rgba(255,255,255,0.12); }
    .reaction-item:hover { border-color: rgba(108,99,255,0.38); }
    .ri-info { flex: 1; min-width: 0; }
    .ri-name { font-weight: 700; font-size: 0.93rem; margin-bottom: 5px; }
    .ri-meta { display: flex; flex-wrap: wrap; gap: 5px; align-items: center; margin-bottom: 5px; }
    .ri-steps { font-size: 0.75rem; color: var(--text3); display: flex; flex-direction: column; gap: 2px; }
    .ri-actions { display: flex; gap: 5px; flex-shrink: 0; }
    .empty-box { background: var(--surface2); border: 1px dashed rgba(108,99,255,0.18); border-radius: var(--radius); padding: 36px 20px; text-align: center; color: var(--text3); font-size: 0.86rem; line-height: 1.8; }
    .empty-icon { font-size: 2.5rem; margin-bottom: 8px; }

    .step-editor { background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 15px; margin-bottom: 10px; }
    .se-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
    .se-lbl { font-size: 0.76rem; font-weight: 700; color: var(--accent2); text-transform: uppercase; letter-spacing: .06em; }
    .se-section { margin-bottom: 10px; }
    .se-section-title { font-size: 0.72rem; font-weight: 700; color: var(--text2); text-transform: uppercase; letter-spacing: .05em; margin-bottom: 7px; }
    .comp-row { display: flex; align-items: flex-start; gap: 7px; margin-bottom: 7px; }
    .comp-row-fields { flex: 1; display: flex; flex-direction: column; gap: 5px; }
    .comp-row-fields input { background: var(--surface3); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); padding: 7px 10px; font-size: 0.82rem; font-family: inherit; outline: none; transition: border-color .15s; }
    .comp-row-fields input:focus { border-color: var(--accent); }
    .url-row { display: flex; gap: 5px; align-items: center; }
    .url-row input { flex: 1; }
    .comp-preview { width: 32px; height: 32px; object-fit: contain; border-radius: 4px; background: #fff; border: 1px solid rgba(255,255,255,0.1); flex-shrink: 0; }
    .byp-check { display: flex; align-items: center; gap: 5px; font-size: 0.76rem; color: var(--text3); cursor: pointer; }
    .byp-check input { accent-color: var(--red); }
    .step-arrow-lbl { text-align: center; font-size: 1.4rem; color: var(--text3); padding: 2px 0 7px; }
    .conds-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
    .conds-grid .cond-lbl-sm { font-size: 0.7rem; font-weight: 600; color: var(--text3); text-transform: uppercase; letter-spacing: .04em; margin-bottom: 4px; }
    .conds-grid input { width: 100%; background: var(--surface3); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); padding: 7px 10px; font-size: 0.82rem; font-family: inherit; outline: none; }
    .conds-grid input:focus { border-color: var(--accent); }

    .sets-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(210px,1fr)); gap: 12px; }
    .set-card { background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; transition: all .18s; }
    .set-card:hover { border-color: rgba(108,99,255,0.35); transform: translateY(-1px); }
    .set-color-bar { height: 3px; }
    .set-card-body { padding: 13px 15px; }
    .set-card-name { font-weight: 700; font-size: 0.92rem; margin-bottom: 3px; }
    .set-card-desc { font-size: 0.78rem; color: var(--text3); margin-bottom: 7px; }
    .set-card-meta { font-size: 0.74rem; color: var(--text2); }
    .set-card-actions { padding: 9px 15px; border-top: 1px solid var(--border); display: flex; gap: 5px; justify-content: flex-end; }
    .color-picker { display: flex; gap: 7px; flex-wrap: wrap; }
    .color-dot { width: 24px; height: 24px; border-radius: 50%; cursor: pointer; border: 2px solid transparent; transition: all .15s; }
    .color-dot:hover, .color-dot.active { border-color: #fff; transform: scale(1.15); }
    .reaction-picker { max-height: 230px; overflow-y: auto; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface2); }
    .rp-item { display: flex; align-items: center; gap: 10px; padding: 9px 13px; cursor: pointer; border-bottom: 1px solid rgba(108,99,255,0.08); transition: background .12s; }
    .rp-item:last-child { border-bottom: none; }
    .rp-item:hover { background: var(--surface3); }
    .rp-item.selected { background: rgba(108,99,255,0.08); }
    .rp-check { width: 18px; height: 18px; border-radius: 4px; border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; font-size: 0.7rem; flex-shrink: 0; color: var(--accent2); background: var(--surface3); font-weight: 700; }
    .rp-item.selected .rp-check { background: var(--accent); border-color: var(--accent); color: #fff; }
    .rp-info { flex: 1; }
    .rp-name { font-size: 0.86rem; font-weight: 600; }
    .rp-meta { display: flex; gap: 5px; margin-top: 3px; }

    .quiz-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; max-width: 1280px; margin: 0 auto; }
    .qc-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 22px; gap: 12px; flex-wrap: wrap; }
    .qc-name { font-size: 1.35rem; font-weight: 700; }
    .qc-badges { display: flex; gap: 6px; flex-shrink: 0; flex-wrap: wrap; }
    .name-hidden { font-size: 1.2rem; font-weight: 700; color: var(--accent2); cursor: pointer; border: 2px dashed var(--accent); padding: 7px 18px; border-radius: var(--radius-sm); animation: pulse-brd 1.6s ease-in-out infinite; display: inline-block; }
    .newly-revealed { color: var(--green); }

    .equation-row { display: flex; align-items: center; justify-content: center; gap: 14px; flex-wrap: wrap; padding: 18px 0 8px; }
    .eq-group { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
    .chain-equation { display: flex; align-items: center; justify-content: flex-start; gap: 10px; flex-wrap: nowrap; padding: 18px 12px 8px; overflow-x: auto; min-width: 0; }
    .chain-arrow-col { display: flex; flex-direction: column; align-items: center; gap: 4px; flex-shrink: 0; }
    .op-sign { font-size: 1.5rem; font-weight: 700; color: var(--text3); }
    .arrow-sign { font-size: 2rem; color: var(--accent2); flex-shrink: 0; }

    .comp-hidden { min-width: 110px; min-height: 100px; border: 2px dashed var(--accent); border-radius: var(--radius-sm); display: flex; flex-direction: column; align-items: center; justify-content: center; cursor: pointer; gap: 4px; padding: 10px; background: var(--accent-glow); animation: pulse-brd 1.6s ease-in-out infinite; transition: background .15s; }
    .comp-hidden:hover { background: rgba(108,99,255,0.18); }
    .comp-q { font-size: 2.2rem; font-weight: 900; color: var(--accent2); line-height: 1; }
    .comp-hint-txt { font-size: 0.66rem; color: var(--accent2); opacity: .8; text-align: center; }
    .comp-shown { min-width: 175px; background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 13px; display: flex; flex-direction: column; align-items: center; gap: 7px; }
    .comp-coeff { font-size: 1.15rem; font-weight: 800; color: var(--accent2); line-height: 1; margin-bottom: -2px; }
    .comp-shown.byproduct { opacity: .65; border-style: dashed; }
    .comp-img { width: 175px; height: 145px; object-fit: contain; background: #fff; border-radius: 4px; padding: 3px; }
    .comp-name { font-size: 0.92rem; font-weight: 600; text-align: center; word-break: break-word; max-width: 175px; }
    .bp-tag { font-size: 0.66rem; color: var(--text3); background: var(--surface3); padding: 1px 6px; border-radius: 3px; }

    .cond-row { display: flex; align-items: center; gap: 9px; padding: 10px 15px; background: var(--surface2); border-radius: var(--radius-sm); font-size: 0.92rem; margin-top: 7px; flex-wrap: wrap; }
    .cond-icon-lbl { font-size: 0.76rem; font-weight: 700; text-transform: uppercase; color: var(--text3); }
    .cond-text { color: var(--text2); }
    .cond-hidden { color: var(--accent2); cursor: pointer; border: 1px dashed var(--accent); padding: 3px 11px; border-radius: 4px; font-size: 0.92rem; animation: pulse-brd 1.6s ease-in-out infinite; }
    .cond-hidden:hover { background: var(--accent-glow); }
    .step-divider { text-align: center; font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--text3); padding: 10px 0 4px; border-top: 1px solid var(--border); margin-top: 14px; }
    .quiz-actions { margin-top: 22px; border-top: 1px solid var(--border); padding-top: 20px; display: flex; justify-content: center; }
    .reveal-hint { font-size: 0.9rem; color: var(--text3); }
    .answer-btns { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; width: 100%; }
    .answer-btns .btn { flex: 1; min-width: 150px; padding: 14px 20px; font-size: 1rem; }

    .prog-wrap { margin-bottom: 18px; max-width: 820px; margin-left: auto; margin-right: auto; }
    .prog-info { display: flex; justify-content: space-between; font-size: 0.79rem; color: var(--text2); margin-bottom: 6px; }
    .prog-bg { background: var(--surface2); border-radius: 10px; height: 7px; overflow: hidden; border: 1px solid var(--border); }
    .prog-fill { height: 100%; background: linear-gradient(90deg,var(--accent),var(--accent2)); border-radius: 10px; transition: width .4s ease; }
    .stats-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(130px,1fr)); gap: 11px; margin-bottom: 14px; }
    .stat-card { background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 14px; text-align: center; }
    .stat-val { font-size: 1.9rem; font-weight: 800; color: var(--accent2); line-height: 1; }
    .stat-lbl { font-size: 0.72rem; color: var(--text3); margin-top: 4px; }
    .type-stat-row { display: flex; align-items: center; gap: 9px; font-size: 0.82rem; margin-bottom: 7px; }
    .tsn { min-width: 145px; max-width: 145px; color: var(--text2); font-size: 0.78rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
    .tsb-bg { flex: 1; height: 8px; background: var(--surface2); border-radius: 4px; overflow: hidden; }
    .tsb-fill { height: 100%; border-radius: 4px; transition: width .4s; }
    .ts-pct { min-width: 34px; text-align: right; color: var(--text3); font-size: 0.74rem; }
    .ts-ct { min-width: 46px; text-align: right; color: var(--text3); font-size: 0.72rem; }
    .empty-state { text-align: center; padding: 50px 20px; color: var(--text3); }
    .empty-state .eis { font-size: 2.5rem; margin-bottom: 10px; }
    .empty-state p { font-size: 0.86rem; line-height: 1.8; }

    .ph-banner { background: linear-gradient(135deg,var(--surface2) 0%,var(--surface3) 100%); border: 1px dashed rgba(108,99,255,0.24); border-radius: var(--radius); padding: 28px 20px; text-align: center; margin-bottom: 18px; }
    .ph-icon { font-size: 2.8rem; margin-bottom: 9px; }
    .ph-title { font-size: 1rem; font-weight: 700; margin-bottom: 6px; }
    .ph-badge { display: inline-flex; padding: 2px 10px; background: rgba(240,160,75,0.12); color: var(--orange); border: 1px solid rgba(240,160,75,0.28); border-radius: 20px; font-size: 0.7rem; font-weight: 700; margin-bottom: 8px; }
    .ph-desc { font-size: 0.8rem; color: var(--text3); max-width: 380px; margin: 0 auto; line-height: 1.6; }
    .login-ph input { width: 100%; background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text3); padding: 10px 13px; font-size: 0.86rem; font-family: inherit; margin-bottom: 9px; }
    .login-ph .divider { text-align: center; font-size: 0.76rem; color: var(--text3); margin: 11px 0; }
    .future-note { font-size: 0.76rem; color: var(--text3); text-align: center; margin-top: 10px; padding: 8px 12px; background: rgba(108,99,255,0.06); border-radius: var(--radius-sm); }

    /* ── Auth ── */
    .auth-tabs { display: flex; background: var(--surface2); border-radius: var(--radius-sm); padding: 3px; margin-bottom: 20px; }
    .auth-tab { flex: 1; padding: 8px; border: none; border-radius: 6px; cursor: pointer; font-family: inherit; font-size: 0.84rem; font-weight: 600; transition: all .15s; background: transparent; color: var(--text2); }
    .auth-tab.active { background: var(--accent); color: #fff; }
    .user-badge { display: flex; align-items: center; gap: 8px; background: var(--surface2); border: 1px solid var(--border); border-radius: 20px; padding: 4px 12px 4px 6px; }
    .user-avatar { width: 24px; height: 24px; background: var(--accent); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 0.7rem; font-weight: 700; color: #fff; flex-shrink: 0; }
    .user-email { font-size: 0.76rem; color: var(--text2); max-width: 140px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
    .logout-btn { background: none; border: none; color: var(--text3); cursor: pointer; font-size: 0.72rem; padding: 2px 5px; border-radius: 4px; font-family: inherit; transition: color .15s; }
    .logout-btn:hover { color: var(--red); }

    /* Katalytischer Zyklus */
    .cycle-wrap { background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius); padding: 10px; overflow-x: auto; margin: 8px 0; -webkit-overflow-scrolling: touch; }
    .cycle-section { background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px 14px; margin-bottom: 10px; }
    .cycle-row { display: flex; gap: 7px; align-items: center; margin-bottom: 7px; }
    .cycle-inp { flex: 1; background: var(--surface3); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); padding: 7px 10px; font-size: 0.82rem; font-family: inherit; outline: none; transition: border-color .15s; }
    .cycle-inp:focus { border-color: var(--accent); }
    .cycle-sel { background: var(--surface3); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); padding: 7px 8px; font-size: 0.78rem; font-family: inherit; outline: none; cursor: pointer; }
    .cycle-sec-title { font-size: 0.72rem; font-weight: 700; color: var(--accent2); text-transform: uppercase; letter-spacing: .05em; margin-bottom: 8px; }

    /* ── Leitner ── */
    .leitner-bar { display: flex; align-items: center; gap: 5px; margin-bottom: 14px; max-width: 820px; margin-left: auto; margin-right: auto; }
    .box-dots { display: flex; gap: 4px; align-items: center; }
    .box-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--surface3); border: 1.5px solid var(--border); transition: all .2s; }
    .box-dot.b1 { background: var(--red); border-color: var(--red); }
    .box-dot.b2 { background: var(--orange); border-color: var(--orange); }
    .box-dot.b3 { background: var(--yellow); border-color: var(--yellow); }
    .box-dot.b4 { background: var(--green); border-color: var(--green); }
    .box-dot.b5 { background: var(--accent2); border-color: var(--accent2); }
    .box-lbl { font-size: 0.7rem; color: var(--text3); margin-left: 3px; }
    .leitner-overview { display: flex; gap: 8px; align-items: flex-end; justify-content: center; margin: 20px 0; }
    .leitner-col { display: flex; flex-direction: column; align-items: center; gap: 5px; }
    .leitner-col-bar { width: 36px; border-radius: 5px 5px 0 0; min-height: 6px; transition: height .3s; }
    .leitner-col-lbl { font-size: 0.68rem; color: var(--text3); }
    .leitner-col-cnt { font-size: 0.8rem; font-weight: 700; }
    .session-done { text-align: center; padding: 40px 20px; }
    .session-done-icon { font-size: 3.5rem; margin-bottom: 12px; }
    .session-done-title { font-size: 1.2rem; font-weight: 800; margin-bottom: 6px; }
    .session-done-sub { font-size: 0.84rem; color: var(--text3); margin-bottom: 22px; }
    .mode-toggle { display: flex; background: var(--surface2); border-radius: var(--radius-sm); padding: 3px; margin-bottom: 14px; max-width: 320px; }
    .mode-btn { flex: 1; padding: 7px; border: none; border-radius: 6px; cursor: pointer; font-family: inherit; font-size: 0.8rem; font-weight: 600; transition: all .15s; background: transparent; color: var(--text2); }
    .mode-btn.active { background: var(--accent); color: #fff; }

    /* ── Announcements ── */
    .ann-banner { padding: 10px 22px; display: flex; align-items: center; gap: 10px; font-size: 0.84rem; }
    .ann-banner.info { background: rgba(108,99,255,0.12); border-bottom: 1px solid rgba(108,99,255,0.28); color: var(--accent2); }
    .ann-banner.warning { background: rgba(240,160,75,0.14); border-bottom: 1px solid rgba(240,160,75,0.32); color: var(--orange); }
    .ann-banner.danger { background: rgba(224,92,92,0.12); border-bottom: 1px solid rgba(224,92,92,0.28); color: var(--red); }
    .ann-banner-text { flex: 1; }

    /* ── Flag button ── */
    .flag-btn { background: none; border: none; cursor: pointer; font-size: 0.85rem; padding: 4px 8px; border-radius: 4px; color: var(--text3); transition: all .15s; }
    .flag-btn:hover { color: var(--red); background: rgba(224,92,92,0.1); }

    /* ── Admin tab ── */
    .flag-item { background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px 14px; margin-bottom: 9px; }
    .flag-item-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; flex-wrap: wrap; margin-bottom: 5px; }
    .flag-reaction-name { font-weight: 700; font-size: 0.9rem; }
    .flag-meta { font-size: 0.72rem; color: var(--text3); }
    .flag-reason { font-size: 0.82rem; color: var(--text2); background: var(--surface3); padding: 7px 10px; border-radius: 5px; margin-top: 5px; font-style: italic; }
    .flag-count { display: inline-flex; align-items: center; justify-content: center; min-width: 18px; height: 18px; padding: 0 5px; background: var(--red); color: #fff; border-radius: 10px; font-size: 0.65rem; font-weight: 800; margin-left: 5px; vertical-align: middle; }
    .ann-item { background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px 14px; margin-bottom: 9px; display: flex; align-items: center; gap: 10px; }
    .ann-item-text { flex: 1; font-size: 0.88rem; }
    .ann-type-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }

    /* ── Scale slider ── */
    .scale-row { display:flex; align-items:center; gap:8px; margin-bottom:8px; max-width:820px; margin-left:auto; margin-right:auto; }
    .scale-row input[type=range] { flex:1; accent-color:var(--accent); cursor:pointer; }
    .scale-lbl { font-size:0.72rem; color:var(--text3); white-space:nowrap; min-width:32px; text-align:right; }

    /* ── Mechanism image ── */
    .mech-wrap { margin-top:12px; border-top:1px solid var(--border); padding-top:12px; }
    .mech-img { max-width:100%; max-height:420px; object-fit:contain; background:#fff; border-radius:8px; padding:8px; border:1px solid var(--border); display:block; margin:10px auto 0; }

    @keyframes pulse-brd {
      0%,100% { box-shadow: 0 0 0 0 rgba(108,99,255,0.35); border-color: rgba(108,99,255,0.55); }
      50% { box-shadow: 0 0 0 4px rgba(108,99,255,0.08); border-color: var(--accent2); }
    }

    @media(max-width:640px){
      .main { padding: 0; }
      .form-grid { grid-template-columns: 1fr; }
      .form-grid .full { grid-column: 1; }
      .conds-grid { grid-template-columns: 1fr; }
      .tab-btn { padding: 10px 11px 8px; font-size: 0.78rem; }
      .equation-row { flex-direction: column; align-items: center; }
      .answer-btns .btn { min-width: 110px; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .tsn { min-width: 100px; max-width: 100px; }

      /* Quiz card fills screen, buttons stay visible */
      .quiz-card {
        border-radius: 0;
        border-left: none;
        border-right: none;
        padding: 14px 14px 0;
        min-height: calc(100svh - 160px);
        display: flex;
        flex-direction: column;
      }
      .quiz-actions {
        margin-top: auto;
        position: sticky;
        bottom: 0;
        background: var(--surface);
        border-top: 1px solid var(--border);
        padding: 12px 0 max(14px, env(safe-area-inset-bottom));
      }
      .scale-row { display: none; }
      .filter-row { padding: 0 10px; }
      .prog-wrap { padding: 0 10px; }
      .leitner-bar { padding: 0 10px; }

      /* During active quiz: hide filter controls (only shown during idle) */
      /* :has() supported iOS 15.4+, Chrome 105+, Firefox 121+ */
      div:has(> .prog-wrap) > .filter-row { display: none; }

      /* Compact progress indicators during active session */
      div:has(> .prog-wrap) .prog-wrap { margin-bottom: 4px; }
      .leitner-bar { margin-bottom: 6px; }

      /* Prevent overscroll bounce on quiz area */
      .main { overscroll-behavior-y: none; }

      /* ── iOS Zoom-Fix: alle Inputs auf min. 16px ── */
      /* iOS Safari zoomt wenn font-size < 16px beim Focus */
      input, textarea, select,
      .form-group input,
      .form-group select,
      .form-group textarea,
      .filter-row select,
      .search-input,
      .cycle-inp,
      .cycle-sel,
      .comp-row-fields input,
      .conds-grid input,
      .login-ph input {
        font-size: 16px !important;
      }

      /* ── Touch-Targets: min 44px ── */
      .btn { min-height: 44px; }
      .btn-sm { min-height: 38px; }
      .tab-btn { min-height: 44px; }
      .login-btn { width: 44px; height: 44px; }

      /* ── Touch-Action: kein 300ms Delay ── */
      button, .btn, .tab-btn, .login-btn, select { touch-action: manipulation; }

      /* ── Modal auf Mobile: volle Breite, scrollbar ── */
      .modal {
        width: calc(100% - 24px);
        max-height: 90svh;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
      }

      /* ── Answer buttons: kompakter auf Mobile ── */
      .answer-btns .btn { padding: 12px 16px; font-size: 0.92rem; }

      /* ── Cycle / Schema on mobile ── */
      .cycle-wrap {
        position: relative;
        padding: 6px 4px;
        border-radius: var(--radius-sm);
      }
      .cycle-wrap svg {
        min-width: 340px;
        height: auto;
      }

      /* Schema SVG: horizontal scroll, never clipped */
      .quiz-card svg {
        min-width: 320px;
        height: auto;
        overflow: visible;
      }

      /* Chain equation: smooth horizontal scroll */
      .chain-equation {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 12px;
        gap: 6px;
        scroll-snap-type: x proximity;
      }
      .chain-equation .comp-shown {
        scroll-snap-align: start;
        min-width: 120px;
      }
      .chain-equation .comp-hidden {
        min-width: 80px;
        min-height: 70px;
      }
      .chain-equation .comp-img {
        width: 120px;
        height: 100px;
      }

      /* Equation row: tighter spacing */
      .equation-row { gap: 8px; padding: 10px 0 6px; }
      .comp-shown { min-width: 130px; }
      .comp-img { width: 130px; height: 110px; }
    }

    /* ── Utility classes (extracted from inline styles) ── */

    /* Spacing */
    .mb-2  { margin-bottom: 2px; }
    .mb-5  { margin-bottom: 5px; }
    .mb-10 { margin-bottom: 10px; }
    .mb-12 { margin-bottom: 12px; }
    .mb-14 { margin-bottom: 14px; }
    .mb-16 { margin-bottom: 16px; }
    .mb-18 { margin-bottom: 18px; }
    .mt-3  { margin-top: 3px; }
    .mt-4  { margin-top: 4px; }
    .mt-10 { margin-top: 10px; }
    .mt-14 { margin-top: 14px; }
    .ml-7  { margin-left: 7px; }

    /* Layout */
    .flex-1        { flex: 1; }
    .cursor-pointer { cursor: pointer; }
    .no-events     { pointer-events: none; }
    .modal-footer-row { display: flex; gap: 8px; justify-content: flex-end; }
    .tag-row       { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
    .flex-center-sm  { display: flex; align-items: center; gap: 4px; flex-shrink: 0; }
    .flex-center-gap10 { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
    .flex-label    { min-width: 62px; flex-shrink: 0; }

    /* Section labels */
    .section-label { font-size: 0.7rem; color: var(--text3); margin-bottom: 12px; text-transform: uppercase; letter-spacing: .06em; font-weight: 700; }
    .section-label--mb10 { margin-bottom: 10px; }
    .section-label-accent { font-size: 0.72rem; color: var(--accent2); margin-bottom: 10px; text-transform: uppercase; letter-spacing: .06em; font-weight: 700; }

    /* Divider */
    .divider-bottom { margin-bottom: 9px; border-bottom: 1px solid var(--border); padding-bottom: 9px; }

    /* Card inset box */
    .card-inset { margin-top: 4px; background: var(--surface2); border-radius: var(--radius); padding: 16px 14px; border: 1px solid var(--border); }

    /* Text styles */
    .text-primary   { color: var(--text); }
    .text-accent2   { color: var(--accent2); }
    .text-muted     { font-size: 0.83rem; color: var(--text3); }
    .text-xs-dim    { font-size: 0.72rem; color: var(--text3); }
    .text-sm-dim    { font-size: 0.74rem; color: var(--text3); }
    .text-strong-md { font-weight: 700; font-size: 0.92rem; }
    .subtitle-inline { color: var(--text3); font-weight: 400; margin-left: 8px; text-transform: none; letter-spacing: 0; }

    /* Inline elements */
    .code-tag    { background: var(--surface3); padding: 1px 5px; border-radius: 3px; }
    .tag-accent  { font-size: 0.75rem; background: rgba(108,99,255,0.1); color: var(--accent2); border: 1px solid rgba(108,99,255,0.22); padding: 2px 8px; border-radius: 10px; white-space: nowrap; flex-shrink: 0; }
    .pill-muted  { font-size: 0.72rem; color: var(--text3); background: var(--surface2); padding: 2px 8px; border-radius: 20px; }

    /* Thumbnail */
    .thumb-sm    { width: 28px; height: 28px; object-fit: contain; background: #fff; border-radius: 4px; flex-shrink: 0; }

    /* Icon spacing */
    .icon-mr     { margin-right: 7px; opacity: 0.85; }

    /* ── Pass 2 utilities ── */
    .mb-6  { margin-bottom: 6px; }
    .mb-8  { margin-bottom: 8px; }
    .mb-20 { margin-bottom: 20px; }
    .mt-8  { margin-top: 8px; }
    .mt-12 { margin-top: 12px; }

    .card-scroll-box { margin-top: 12px; background: var(--surface2); border-radius: var(--radius); padding: 16px 14px; border: 1px solid var(--border); overflow-x: auto; margin-bottom: 12px; }
    .card-scroll-sm  { margin-bottom: 18px; background: var(--surface2); border-radius: var(--radius); padding: 14px; border: 1px solid var(--border); overflow-x: auto; }
    .flex-between    { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }

    .text-green       { color: var(--green); }
    .text-xxs-accent  { font-size: 0.6rem; color: rgba(99,102,241,0.85); }
    .text-placeholder { color: var(--text3); font-size: 0.88rem; font-style: italic; opacity: 0.5; }
    .text-strong-lg   { font-weight: 800; font-size: 1rem; }
    .text-emoji-lg    { font-size: 2rem; margin-bottom: 10px; }
    .font-bold        { font-weight: 700; }