/* Lesson card */
  .lesson {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 16px 18px;
    margin-bottom: 22px;
    display: grid; grid-template-columns: auto minmax(0, 1fr) auto auto; gap: 18px; align-items: start;
  }
  .lesson-collapsible {
    overflow: hidden;
    transition: max-height .25s ease, opacity .2s ease;
    max-height: 600px; opacity: 1;
  }
  .lesson-collapsible.collapsed { max-height: 0; opacity: 0; }
  .lesson-toggle {
    padding: 4px 6px; align-self: center;
    color: var(--muted);
  }
  .lesson-toggle svg { transition: transform .2s; }
  .lesson-toggle.open svg { transform: rotate(180deg); }
  .lesson-tag {
    font-family: 'JetBrains Mono', monospace; font-size: 12px;
    color: var(--accent); background: var(--accent-soft);
    padding: 4px 10px; border-radius: 999px; font-weight: 700;
    align-self: start;
  }
  .lesson-select-wrap {
    position: relative;
    display: inline-flex;
    align-self: start;
  }
  .lesson-select-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--accent);
    cursor: pointer;
    font: 700 12px 'JetBrains Mono', monospace;
    min-width: 98px;
    transition: background .12s, border-color .12s, box-shadow .12s, color .12s;
  }
  .lesson-select-button:hover,
  .lesson-select-button.open {
    background: oklch(0.92 0.06 255);
    border-color: oklch(0.48 0.17 255);
    box-shadow: 0 0 0 3px var(--accent-soft);
  }
  .lesson-select-button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }
  .lesson-select-chevron {
    width: 16px;
    height: 16px;
    margin-left: auto;
    transition: transform .16s ease;
  }
  .lesson-select-button.open .lesson-select-chevron {
    transform: rotate(180deg);
  }
  .lesson-select-menu {
    position: absolute;
    left: 0;
    top: calc(100% + 7px);
    z-index: 45;
    display: none;
    min-width: 118px;
    padding: 6px;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow);
  }
  .lesson-select-menu.open {
    display: grid;
    gap: 3px;
  }
  .lesson-select-option {
    width: 100%;
    border: 0;
    border-radius: 10px;
    background: transparent;
    color: var(--ink);
    cursor: pointer;
    font: 700 12px 'JetBrains Mono', monospace;
    padding: 8px 10px;
    text-align: left;
  }
  .lesson-select-option:hover,
  .lesson-select-option.on {
    background: var(--accent-soft);
    color: var(--accent);
  }
  .compare-select-wrap {
    display: inline-flex;
  }
  .compare-select-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-width: 92px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--panel);
    color: var(--ink);
    cursor: pointer;
    font: 700 12px 'JetBrains Mono', monospace;
    padding: 7px 10px;
    transition: background .12s, border-color .12s, box-shadow .12s;
  }
  .compare-select-button:hover,
  .compare-select-button.open {
    background: var(--bg-2);
    border-color: var(--line-2);
    box-shadow: 0 0 0 3px rgb(15 23 42 / 0.06);
  }
  .compare-select-button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }
  .compare-select-button.open .lesson-select-chevron {
    transform: rotate(180deg);
  }
  .compare-select-menu {
    min-width: 118px;
  }
  .compare-select-option:hover {
    background: var(--bg-2);
    color: var(--ink);
  }
  .compare-select-option.on {
    background: transparent;
    color: var(--ink);
  }
  .lesson-compare-control {
    display: flex;
    align-items: center;
    gap: 8px;
    align-self: start;
  }
  .lesson-compare-control span {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--muted);
  }
  .lesson-text h2 { margin: 0 0 4px; font-size: 16px; font-weight: 600; letter-spacing: -0.01em; }
  .lesson-text p { margin: 0; color: var(--ink-2); font-size: 13.5px; line-height: 1.5; }
  .lesson-hint {
    font-family: 'JetBrains Mono', monospace; font-size: 11.5px;
    color: var(--muted); white-space: nowrap;
  }
  .board-rule {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11.5px;
    color: var(--muted);
    text-align: right;
    margin-left: auto;
  }

  /* Test mode */
  .test-panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px;
    margin-bottom: 22px;
  }
  .test-head {
    display: flex; align-items: flex-start; justify-content: space-between;
    gap: 16px; margin-bottom: 14px;
  }
  .test-kicker {
    font-size: 11px; font-weight: 700; text-transform: uppercase;
    letter-spacing: 0.07em; color: var(--muted); margin-bottom: 5px;
  }
  .test-title {
    font-size: 17px; font-weight: 700; letter-spacing: -0.01em;
    color: var(--ink); margin: 0;
  }
  .test-score {
    font-family: 'JetBrains Mono', monospace; font-size: 12px; font-weight: 700;
    color: var(--ink-2); background: var(--bg-2); border: 1px solid var(--line);
    border-radius: 6px; padding: 5px 8px; white-space: nowrap;
  }
  .test-score-stack {
    display: flex; flex-direction: column; gap: 6px; align-items: flex-end;
  }
  .test-prompt {
    color: var(--ink-2); font-size: 14px; line-height: 1.5; margin: 0 0 14px;
  }
  .test-meta {
    display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px;
  }
  .test-pill {
    font-family: 'JetBrains Mono', monospace; font-size: 12px; font-weight: 700;
    color: var(--accent); background: var(--accent-soft);
    border-radius: 999px; padding: 4px 9px;
  }
  .test-answer-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 10px; margin-bottom: 14px;
  }
  .test-setup-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px; margin: 14px 0 16px;
  }
  .test-setup-section {
    border: 1px solid var(--line); border-radius: 8px;
    background: var(--bg-2); padding: 12px;
  }
  .test-setup-section h3 {
    margin: 0 0 10px; font-size: 12px; text-transform: uppercase;
    letter-spacing: 0.06em; color: var(--muted);
  }
  .test-choice-grid {
    display: flex; flex-wrap: wrap; gap: 8px;
  }
  .test-choice {
    position: relative;
  }
  .test-choice input {
    position: absolute; opacity: 0; pointer-events: none;
  }
  .test-choice span {
    display: inline-flex; align-items: center;
    border: 1px solid var(--line); border-radius: 999px;
    background: var(--panel); color: var(--ink-2);
    padding: 7px 11px; font-size: 13px; font-weight: 700;
    cursor: pointer; transition: all .12s;
  }
  .test-choice input:checked + span {
    border-color: var(--accent); background: var(--accent-soft); color: var(--accent);
  }
  .test-choice input:focus-visible + span {
    box-shadow: 0 0 0 3px var(--accent-soft);
  }
  .test-choice-inline {
    display: inline-flex; margin: 0 0 16px;
  }
  .test-field label {
    display: block; font-size: 11px; font-weight: 700; text-transform: uppercase;
    letter-spacing: 0.05em; color: var(--muted); margin-bottom: 5px;
  }
  .test-input-wrap {
    display: flex; align-items: center;
    border: 1px solid var(--line); border-radius: 8px;
    background: var(--panel); overflow: hidden;
  }
  .test-input {
    width: 100%; min-width: 0; border: 0;
    background: transparent; color: var(--ink);
    padding: 9px 10px; font: 600 14px 'JetBrains Mono', monospace;
  }
  .test-input:focus { outline: none; }
  .test-unit {
    border-left: 1px solid var(--line);
    background: var(--bg-2); color: var(--muted);
    padding: 9px 10px; font-size: 12px; font-weight: 700;
    white-space: nowrap;
  }
  .test-input-wrap:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
  }
  .test-input-wrap:has(.test-input.correct) {
    border-color: var(--good);
    background: var(--good-soft);
  }
  .test-input-wrap:has(.test-input.wrong) {
    border-color: var(--warn);
    background: var(--warn-soft);
  }
  .test-input.correct {
    background: transparent;
  }
  .test-input.wrong {
    background: transparent;
  }
  .test-options {
    display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px;
  }
  .test-option {
    border: 1px solid var(--line); background: var(--panel); border-radius: 8px;
    padding: 8px 12px; font-weight: 700; font-size: 13px;
  }
  .test-option.selected {
    border-color: var(--accent); background: var(--accent-soft); color: var(--accent);
  }
  .test-option.correct {
    border-color: var(--good); background: var(--good-soft); color: var(--ink);
  }
  .test-option.wrong {
    border-color: var(--warn); background: var(--warn-soft); color: var(--ink);
  }
  .test-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
  }
  .test-question-actions {
    margin-top: 2px;
    margin-bottom: 14px;
  }
  .test-summary-actions {
    margin-top: 18px;
    padding-top: 2px;
    clear: both;
  }
  .test-actions .btn {
    min-height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1.15;
  }
  .test-action-main {
    min-width: 72px;
  }
  .test-action-secondary {
    background: var(--panel);
    border-color: var(--line);
    color: var(--ink);
  }
  .test-action-secondary:hover:not(:disabled) {
    background: var(--bg-2);
    border-color: var(--line-2);
    color: var(--ink);
  }
  .test-action-next {
    min-width: 120px;
  }
  .test-action-finish {
    margin-left: 10px;
    color: var(--ink-2);
  }
  .test-action-finish:hover:not(:disabled) {
    background: var(--warn-soft);
    border-color: var(--warn);
    color: var(--ink);
  }
  .test-feedback {
    margin-top: 12px; border-radius: 8px; padding: 10px 12px;
    font-size: 13px; line-height: 1.45; display: none;
  }
  .test-feedback.good {
    display: block; border: 1px solid var(--good); background: var(--good-soft); color: var(--ink);
  }
  .test-feedback.warn {
    display: block; border: 1px solid var(--warn); background: var(--warn-soft); color: var(--ink);
  }
  .test-summary {
    display: grid; gap: 10px; margin-top: 14px;
  }
  .test-summary-row {
    display: grid; grid-template-columns: minmax(140px, 1fr) auto auto auto;
    gap: 10px; align-items: center;
    border: 1px solid var(--line); border-radius: 8px;
    padding: 9px 10px; background: var(--panel);
    font-size: 13px;
  }
  .test-summary-row strong { font-weight: 700; }
  .test-summary-row span {
    font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--ink-2);
  }
  .test-recommendations,
  .test-history {
    margin-top: 16px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--bg-2);
    padding: 12px;
  }
  .test-recommendations h3,
  .test-history h3 {
    margin: 0 0 10px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--muted);
  }
  .test-recommendations ul {
    margin: 0;
    padding-left: 18px;
    color: var(--ink-2);
    font-size: 13px;
    line-height: 1.5;
  }
  .test-history-list {
    display: grid;
    gap: 10px;
  }
  .test-history-item {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 10px;
  }
  .test-history-head {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    align-items: center;
    margin-bottom: 8px;
  }
  .test-history-head strong {
    font-size: 13px;
  }
  .test-history-state {
    border-radius: 999px;
    padding: 3px 8px;
    font-size: 11px;
    font-weight: 700;
    white-space: nowrap;
  }
  .test-history-state.good {
    background: var(--good-soft);
    color: var(--good);
  }
  .test-history-state.warn {
    background: var(--warn-soft);
    color: var(--warn);
  }
  .test-history-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 8px;
  }
  .test-history-item p {
    margin: 0 0 8px;
    color: var(--ink-2);
    font-size: 13px;
    line-height: 1.45;
  }
  .test-history-answer {
    color: var(--ink-2);
    font-size: 12.5px;
    line-height: 1.45;
  }
  .test-history-answer span {
    font-weight: 700;
    color: var(--ink);
  }
  .test-history-empty {
    color: var(--muted);
    font-size: 13px;
  }

  /* Disks board */
  .board-wrap {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px 16px 14px;
    position: relative;
  }
  .board-head {
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 12px 14px;
    border-bottom: 1px dashed var(--line);
    margin-bottom: 18px;
    gap: 18px;
  }
  .board-title { font-weight: 600; font-size: 14px; letter-spacing: -0.005em; flex-shrink: 0; }
  .board-hint { font-size: 12px; color: var(--muted); }
  .board-scroll-hint {
    display: none;
    font-size: 12px;
    color: var(--accent);
    font-weight: 600;
  }
  .board-actions { display: flex; gap: 6px; }

  .practice-guide {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    margin-bottom: 14px;
  }
  .practice-step {
    display: flex;
    align-items: flex-start;
    gap: 9px;
    min-width: 0;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel);
    padding: 10px;
    color: var(--ink-2);
  }
  .practice-step.active {
    border-color: var(--accent);
    background: var(--accent-soft);
    color: var(--ink);
  }
  .practice-step.done {
    border-color: var(--good);
    background: var(--good-soft);
  }
  .practice-step-num {
    width: 22px;
    height: 22px;
    border-radius: 999px;
    display: grid;
    place-items: center;
    flex: 0 0 auto;
    background: var(--bg-2);
    color: var(--muted);
    font: 700 12px 'JetBrains Mono', monospace;
  }
  .practice-step.active .practice-step-num {
    background: var(--accent);
    color: white;
  }
  .practice-step.done .practice-step-num {
    background: var(--good);
    color: white;
  }
  .practice-step strong {
    display: block;
    font-size: 12.5px;
    line-height: 1.2;
  }
  .practice-step small {
    display: block;
    margin-top: 3px;
    color: var(--muted);
    font-size: 11.5px;
    line-height: 1.35;
  }

  /* Connect bar (above disks) */
  .connect-bar {
    display: flex; align-items: center; gap: 18px;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 12px 16px;
    margin-bottom: 14px;
  }
  .connect-step { display: flex; align-items: center; gap: 12px; flex: 1; min-width: 0; }
  .step-num {
    width: 26px; height: 26px; border-radius: 50%;
    background: var(--accent-soft); color: var(--accent);
    display: grid; place-items: center;
    font-weight: 700; font-size: 13px; font-family: 'JetBrains Mono', monospace;
    flex-shrink: 0;
  }
  .step-text { min-width: 0; }
  .step-title { font-size: 13.5px; font-weight: 600; color: var(--ink); letter-spacing: -0.005em; }
  .step-sub { font-size: 12px; color: var(--muted); margin-top: 2px; }
  .step-sub.ready { color: var(--accent); font-weight: 600; }
  .connect-actions { display: flex; gap: 6px; flex-shrink: 0; }

  .disks {
    display: flex; gap: 22px; padding: 0 12px 14px;
    overflow-x: auto;
    align-items: flex-start;
    min-height: 280px;
  }
  .disk {
    flex: 0 0 auto;
    width: 110px;
    display: flex; flex-direction: column; align-items: stretch;
    user-select: none;
  }
  .disk-head {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 8px; padding: 0 2px;
    cursor: pointer;
  }
  .disk-head-left { display: flex; align-items: center; gap: 6px; }
  .disk-check {
    width: 18px; height: 18px; border-radius: 5px;
    border: 1.5px solid var(--line-2); background: white;
    display: grid; place-items: center;
    transition: all .12s;
    flex-shrink: 0;
  }
  .disk-check svg { opacity: 0; transition: opacity .12s; }
  .disk.selected .disk-check {
    background: var(--accent); border-color: var(--accent);
  }
  .disk.selected .disk-check svg { opacity: 1; }
  .disk-name {
    font-family: 'JetBrains Mono', monospace; font-size: 12px; font-weight: 600;
    color: var(--ink-2);
  }
  .disk.selected .disk-name { color: var(--accent); }
  .disk-grouped {
    width: 8px; height: 8px; border-radius: 50%;
  }

  .disk-stack {
    background: var(--bg-2);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 6px;
    display: flex; flex-direction: column; gap: 4px;
    transition: box-shadow .15s, border-color .15s, background .15s;
  }
  .disk.selected .disk-stack {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
  }
  .disk.grouped .disk-stack {
    border-color: var(--ink-2);
  }

  .block {
    height: 38px; border-radius: var(--radius-sm);
    background: var(--row-empty);
    border: 1.5px dashed var(--line-2);
    display: grid; place-items: center;
    font-family: 'JetBrains Mono', monospace; font-weight: 600; font-size: 13px;
    color: var(--muted);
    cursor: pointer;
    transition: all .1s;
    position: relative;
  }
  .block:hover { border-color: var(--ink-2); color: var(--ink-2); }
  .block.filled {
    border-style: solid; border-color: oklch(0.70 0.04 260 / 0.4);
    color: oklch(0.20 0.04 60);
    cursor: grab;
  }
  .block.filled:active { cursor: grabbing; }
  .block.dragging-src { opacity: 0.35; }
  .block.copying-src {
    box-shadow: 0 0 0 2.5px var(--accent), 0 0 0 5px var(--accent-soft);
  }
  .right-copy-ghost {
    position: fixed;
    left: 0;
    top: 0;
    z-index: 9999;
    pointer-events: none;
    opacity: 0.82;
    box-shadow: 0 10px 24px oklch(0.2 0.03 260 / 0.22);
    transform-origin: top left;
  }
  body.right-copy-dragging {
    user-select: none;
  }
  .block.slot-selected {
    box-shadow: 0 0 0 2.5px var(--accent), 0 0 0 5px var(--accent-soft);
    z-index: 1;
  }
  .block.slot-selected:not(.filled) {
    border-style: solid; border-color: var(--accent);
    background: var(--accent-soft);
  }
  .block[data-row="A"] { background: var(--row-A); }
  .block[data-row="B"] { background: var(--row-B); }
  .block[data-row="C"] { background: var(--row-C); }
  .block[data-row="D"] { background: var(--row-D); }
  .block[data-row="E"] { background: var(--row-E); }
  /* Empty slots tinted by row so the row's color is visible from the start */
  .block:not(.filled)[data-row_key="A"] { background: var(--row-A-soft); border-color: var(--row-A-line); color: oklch(0.55 0.10 80); }
  .block:not(.filled)[data-row_key="B"] { background: var(--row-B-soft); border-color: var(--row-B-line); color: oklch(0.55 0.10 110); }
  .block:not(.filled)[data-row_key="C"] { background: var(--row-C-soft); border-color: var(--row-C-line); color: oklch(0.55 0.10 155); }
  .block:not(.filled)[data-row_key="D"] { background: var(--row-D-soft); border-color: var(--row-D-line); color: oklch(0.50 0.09 230); }
  .block:not(.filled)[data-row_key="E"] { background: var(--row-E-soft); border-color: var(--row-E-line); color: oklch(0.50 0.09 290); }
  .block.dragover-bad {
    border-color: var(--warn) !important;
    border-style: solid !important;
    background: var(--warn-soft) !important;
    cursor: not-allowed;
  }
  .block.dragover {
    transform: scale(1.04);
    border-color: var(--accent); border-style: solid;
    box-shadow: 0 0 0 3px var(--accent-soft);
  }
  .block.wrong {
    box-shadow: 0 0 0 2.5px var(--warn), 0 0 0 5px var(--warn-soft);
    animation: shake .25s ease-out;
  }
  .block.correct {
    box-shadow: 0 0 0 2.5px var(--good), 0 0 0 5px var(--good-soft);
  }
  @keyframes shake {
    0%   { transform: translateX(0); }
    25%  { transform: translateX(-2px); }
    50%  { transform: translateX(2px); }
    75%  { transform: translateX(-1px); }
    100% { transform: translateX(0); }
  }
  .block .clr {
    position: absolute; top: 2px; right: 2px;
    width: 14px; height: 14px; border-radius: 4px;
    background: rgba(255,255,255,0.5);
    display: none; place-items: center;
    font-size: 10px; color: var(--ink);
  }
  .block.filled:hover .clr { display: grid; }

  .disk-foot {
    text-align: center; margin-top: 10px;
    font-size: 12px; color: var(--muted); font-weight: 500;
  }

  /* Connections SVG (group brackets above disks) */
  .conn-layer {
    position: relative;
    left: 0; right: 0;
    pointer-events: none;
    z-index: 2;
    display: block;
    width: 100%;
    margin-bottom: -4px;
  }
  .conn-layer .grp-hit {
    pointer-events: auto;
    cursor: pointer;
  }
  .conn-layer .grp-hit:hover ~ .grp-bracket,
  .conn-layer g.grp:hover .grp-bracket {
    stroke-width: 2.5;
  }
  .conn-layer g.grp .grp-bracket,
  .conn-layer g.grp .grp-tick,
  .conn-layer g.grp .grp-label { transition: stroke-width .12s, font-size .12s; }
  .conn-layer g.grp.selected .grp-bracket,
  .conn-layer g.grp.selected .grp-tick { stroke-width: 3; }
  .conn-layer g.grp.selected .grp-halo { opacity: 0.18; }
  .conn-layer .grp-halo { opacity: 0; transition: opacity .15s; }
  .conn-layer g.grp:hover .grp-halo { opacity: 0.10; }

  /* ───── Palette (bottom) ───── */
  .palette {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 14px 16px;
    margin-top: 22px;
  }
  .palette-head {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 10px;
  }
  .palette-title { font-weight: 600; font-size: 13px; }
  .palette-sub { color: var(--muted); font-size: 12px; }
  .chips {
    display: flex; flex-wrap: wrap; gap: 6px;
  }
  .chip {
    padding: 6px 10px; min-width: 44px;
    border-radius: var(--radius-sm); border: 1.5px solid transparent;
    font-family: 'JetBrains Mono', monospace; font-weight: 600; font-size: 13px;
    text-align: center;
    cursor: grab;
    transition: transform .1s;
  }
  .chip:active { cursor: grabbing; transform: scale(0.96); }
  .chip[data-row="A"] { background: var(--row-A); }
  .chip[data-row="B"] { background: var(--row-B); }
  .chip[data-row="C"] { background: var(--row-C); }
  .chip[data-row="D"] { background: var(--row-D); }
  .chip[data-row="E"] { background: var(--row-E); }
  .chip[data-row="empty"] { background: var(--row-empty); border-color: var(--line-2); border-style: dashed; color: var(--muted); }

  /* ───── Side panel ───── */
  .side h3 {
    margin: 0 0 8px; font-size: 12px; text-transform: uppercase; letter-spacing: 0.07em;
    color: var(--muted); font-weight: 600;
    text-align: left;
  }
  .side .card {
    background: var(--bg-2); border: 1px solid var(--line);
    border-radius: var(--radius); padding: 10px;
  }
  .info-heading { display: flex; align-items: center; justify-content: space-between; }
  .info-heading-title { text-align: left; white-space: nowrap; }
  .info-toggle { padding: 2px 6px; }
  .info-card { padding: 12px; }
  .info p { margin: 0 0 6px; font-size: 13px; line-height: 1.5; color: var(--ink-2); }
  .info p:last-child { margin-bottom: 0; }
  .info code {
    background: var(--panel); border: 1px solid var(--line); border-radius: 4px;
    padding: 1px 5px; font-family: 'JetBrains Mono', monospace; font-size: 12px;
  }
  .einsatz-label {
    font-weight: 700; color: var(--accent);
  }
  .stat-box-full {
    grid-column: 1 / -1;
  }
  .stat-speed-row {
    display: flex; align-items: center; gap: 8px;
    margin: 3px 0 2px;
  }
  .stat-speed-item {
    display: flex; align-items: center; gap: 4px;
    font-family: 'JetBrains Mono', monospace; font-size: 15px; font-weight: 700; color: var(--ink);
  }
  .stat-speed-val {
    font-family: 'JetBrains Mono', monospace; font-size: 15px; font-weight: 700; color: var(--ink);
  }
  .stat-speed-icon {
    font-size: 9px; font-weight: 700; letter-spacing: 0.04em;
    background: var(--bg-2); border: 1px solid var(--line);
    border-radius: 3px; padding: 1px 5px;
    color: var(--muted); font-family: 'Inter', sans-serif;
  }
  .stat-speed-sep {
    color: var(--line-2); font-size: 14px;
  }

  .pros-cons {
    margin: 10px 0 0;
    display: flex; flex-direction: column; gap: 4px;
  }
  .pros-cons-row {
    font-size: 12.5px; line-height: 1.4; color: var(--ink-2);
  }
  .pros-label {
    font-weight: 700; color: var(--good);
  }
  .cons-label {
    font-weight: 700; color: var(--warn);
  }

  .info-stats {
    display: grid; grid-template-columns: 1fr 1fr; gap: 6px;
    margin-top: 12px;
  }
  .stat-box {
    background: var(--panel); border: 1px solid var(--line); border-radius: 8px;
    padding: 8px 8px;
    min-width: 0;
  }
  .stat-box {
    background: var(--panel); border: 1px solid var(--line); border-radius: 8px;
    padding: 10px 12px;
  }
  .stat-label {
    font-size: 9px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em;
    color: var(--muted); margin-bottom: 3px;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  }
  .stat-value {
    font-family: 'JetBrains Mono', monospace; font-size: 18px; font-weight: 700;
    color: var(--ink); line-height: 1.1; margin-bottom: 4px;
    white-space: normal; overflow-wrap: break-word;
  }
  .stat-note {
    font-size: 11px; color: var(--ink-2); line-height: 1.4;
    overflow-wrap: break-word;
  }
  .compare-card {
    display: grid;
    gap: 10px;
  }
  .compare-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }
  .compare-controls label {
    display: grid;
    gap: 4px;
  }
  .compare-controls span {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted);
  }
  .compare-controls select {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 7px;
    background: var(--panel);
    color: var(--ink);
    padding: 7px 8px;
    font: 700 12px 'JetBrains Mono', monospace;
  }
  .compare-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }
  .compare-item {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 10px;
    min-width: 0;
  }
  .compare-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    font-weight: 800;
    color: var(--ink);
  }
  .compare-sub {
    font-size: 11px;
    color: var(--muted);
    margin: 2px 0 8px;
  }
  .compare-row {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    border-top: 1px solid var(--line);
    padding-top: 6px;
    margin-top: 6px;
    font-size: 11.5px;
    color: var(--ink-2);
  }
  .compare-row strong {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11.5px;
    color: var(--ink);
    text-align: right;
  }
  .compare-panel {
    display: grid;
    gap: 16px;
  }
  .compare-table-section h3 {
    margin: 0 0 8px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--muted);
    font-weight: 600;
  }
  .compare-mode-head {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 16px 18px;
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 18px;
  }
  .compare-mode-controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
  }
  .compare-mode-controls label {
    display: grid;
    gap: 4px;
  }
  .compare-mode-controls span {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted);
  }
  .compare-mode-controls select {
    min-width: 140px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel);
    color: var(--ink);
    padding: 8px 10px;
    font: 700 13px 'JetBrains Mono', monospace;
  }
  .compare-boards {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
  .compare-board-card {
    --compare-disk-width: 110px;
    --compare-gap: 20px;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 16px;
    min-width: 0;
  }
  .compare-board-head {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: start;
    border-bottom: 1px dashed var(--line);
    padding-bottom: 12px;
    margin-bottom: 14px;
  }
  .compare-board-head h3 {
    margin: 8px 0 0;
    font-size: 15px;
  }
  .compare-board-card.compact {
    padding: 12px;
  }
  .compare-board-card.compact .compare-board-head {
    margin-bottom: 10px;
    padding-bottom: 10px;
  }
  .compare-board-card.compact .compare-board-head h3 {
    max-width: 420px;
    font-size: 13px;
    line-height: 1.35;
  }
  .compare-board-card.compact {
    --compare-disk-width: 96px;
    --compare-gap: 14px;
  }
  .compare-board-card.compact .block {
    height: 32px;
    font-size: 12px;
  }
  .compare-board-meta {
    font-family: 'JetBrains Mono', monospace;
    color: var(--muted);
    font-size: 11px;
    white-space: nowrap;
  }
  .compare-board-scroll {
    overflow-x: auto;
    padding: 0 0 10px;
  }
  .compare-board-map {
    min-width: calc((var(--compare-disk-width) * var(--compare-disks)) + (var(--compare-gap) * (var(--compare-disks) - 1)));
    width: max-content;
    margin: 8px 8px 0;
  }
  .compare-board-disks {
    display: flex;
    gap: var(--compare-gap);
    align-items: flex-start;
  }
  .compare-disk {
    width: var(--compare-disk-width);
    flex: 0 0 auto;
    border-radius: 10px;
    padding: 4px;
  }
  .compare-brackets {
    display: grid;
    gap: 5px;
    margin: 0 0 6px;
  }
  .compare-bracket-row {
    position: relative;
    min-height: 34px;
  }
  .compare-bracket {
    position: absolute;
    top: 14px;
    display: flex;
    justify-content: center;
    font: 800 10.5px 'JetBrains Mono', monospace;
    text-align: center;
  }
  .compare-bracket::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    border-top: 2px solid currentColor;
  }
  .compare-bracket-tick {
    position: absolute;
    top: 0;
    height: 14px;
    border-left: 2px solid currentColor;
    transform: translateX(-1px);
  }
  .compare-bracket span {
    position: relative;
    z-index: 1;
    background: var(--panel);
    padding: 0 5px;
    transform: translateY(-15px);
  }
  .compare-block {
    pointer-events: none;
    cursor: default;
  }
  .compare-disk.failed.allowed {
    background: var(--good-soft);
    box-shadow: 0 0 0 2px var(--good);
  }
  .compare-disk.failed.bad {
    background: var(--warn-soft);
    box-shadow: 0 0 0 2px var(--warn);
  }
  .compare-fail-badge {
    margin-top: 6px;
    border-radius: 999px;
    padding: 2px 6px;
    text-align: center;
    font-size: 10px;
    font-weight: 800;
    color: var(--ink);
    background: var(--panel);
    border: 1px solid var(--line);
  }
  .test-raid-preview {
    margin: 14px 0;
    display: grid;
    gap: 8px;
  }
  .test-preview-title {
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--muted);
  }
  .test-preview-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }
  .compare-table-card {
    padding: 0;
    overflow: hidden;
  }
  .compare-table {
    display: grid;
    grid-template-columns: minmax(140px, .7fr) minmax(0, 1fr) minmax(0, 1fr);
    font-size: 12px;
  }
  .compare-table > div {
    padding: 9px 10px;
    border-bottom: 1px solid var(--line);
    min-width: 0;
    overflow-wrap: break-word;
    color: var(--ink-2);
  }
  .compare-table > div:nth-last-child(-n+3) {
    border-bottom: 0;
  }
  .compare-table-head {
    background: var(--bg-2);
    color: var(--ink) !important;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 800;
  }
  .compare-table-label {
    font-weight: 800;
    color: var(--ink) !important;
  }

  @media (max-width: 1180px) {
    .compare-boards {
      grid-template-columns: 1fr;
    }
    .test-preview-grid {
      grid-template-columns: 1fr;
    }
  }

  .group-actions { display: flex; flex-direction: column; gap: 8px; }
  .group-actions .btn { width: 100%; justify-content: center; display: flex; align-items: center; gap: 6px; }

  .groups-list { display: flex; flex-direction: column; gap: 8px; }
  .group-item {
    background: var(--panel); border: 1px solid var(--line);
    border-radius: var(--radius); padding: 10px 12px;
    display: flex; align-items: center; gap: 10px;
    cursor: pointer; transition: all .12s;
  }
  .group-item:hover { border-color: var(--line-2); }
  .group-item.selected {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-soft);
  }
  .group-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
  .group-name {
    font-family: 'JetBrains Mono', monospace; font-weight: 700; font-size: 13px;
    color: var(--ink);
  }
  .group-kind { color: var(--muted); font-weight: 500; font-size: 11px; }
  .group-meta { font-size: 11.5px; color: var(--muted); margin-top: 2px; }
  .group-info { flex: 1; min-width: 0; }
  .group-rm {
    background: transparent; border: 0; color: var(--muted); padding: 2px 4px;
    border-radius: 4px;
  }
  .group-rm:hover { background: var(--warn-soft); color: var(--warn); }

  .empty-state {
    color: var(--muted); font-size: 12.5px; padding: 8px 4px;
    line-height: 1.5;
  }

  .check-bar {
    background: var(--panel); border: 1px solid var(--line);
    border-radius: var(--radius); padding: 10px 12px;
    display: flex; align-items: center; gap: 10px;
    font-size: 13px;
    line-height: 1.4;
  }
  .check-bar.good { border-color: var(--good); background: var(--good-soft); }
  .check-bar.warn { border-color: var(--warn); background: var(--warn-soft); }
  .check-bar svg { flex-shrink: 0; align-self: flex-start; margin-top: 2px; }
  #check-text {
    display: grid;
    gap: 5px;
  }
  #check-text strong {
    color: var(--ink);
    font-weight: 700;
  }
  #check-text span {
    display: block;
  }

  /* Footer */
  footer {
    padding: 10px 24px;
    border-top: 1px solid var(--line);
    color: var(--muted); font-size: 12px;
    display: flex; align-items: center; justify-content: space-between;
    background: var(--panel);
  }
  footer kbd {
    background: var(--bg-2); border: 1px solid var(--line); border-bottom-width: 2px;
    border-radius: 4px; padding: 1px 5px;
    font-family: 'JetBrains Mono', monospace; font-size: 11px;
  }