.learning-coach,
.notebook-panel,
.records-panel {
    padding: 26px;
    border: 1px solid var(--lab-line);
    border-radius: var(--lab-radius);
    background: var(--lab-surface);
    min-width: 0;
}
.learning-coach { margin: 30px 0 22px; border-left: 3px solid var(--lab-accent); }
.coach-heading { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; }
.learning-eyebrow { color: var(--lab-muted); font-size: 12px; letter-spacing: .05em; }
.coach-heading h2, .learning-workspace h2 { margin: 6px 0 0; font-size: 23px; line-height: 1.45; }
.coach-state { padding: 5px 11px; border: 1px solid var(--lab-line-strong); border-radius: 999px; font-size: 12px; white-space: nowrap; }
.learning-steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; padding: 0; margin: 24px 0 18px; list-style: none; }
.learning-steps li { display: flex; align-items: center; gap: 10px; padding: 12px; border-bottom: 2px solid var(--lab-line); color: var(--lab-muted); font-size: 13px; }
.learning-steps li span { display: grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; background: var(--lab-surface-2); font-size: 12px; }
.learning-steps li[aria-current="step"] { color: var(--lab-text); border-color: var(--lab-accent); }
.learning-steps li[aria-current="step"] span { color: var(--lab-bg); background: var(--lab-accent); }
#coachHint { color: var(--lab-muted); font-size: 14px; margin: 0 0 18px; }
.coach-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.coach-actions .button { min-width: 150px; }
.learning-workspace { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 22px; margin: 26px 0; }
.notebook-label { display: block; font-size: 13px; margin: 20px 0 8px; }
.notebook-panel input,
.notebook-panel textarea { display: block; width: 100%; min-width: 0; border: 1px solid var(--lab-line-strong); border-radius: 9px; background: var(--lab-bg); color: var(--lab-text); padding: 12px; font: inherit; font-size: 14px; line-height: 1.7; }
.notebook-panel textarea { resize: vertical; min-height: 120px; }
.notebook-panel ::placeholder { color: var(--lab-muted); opacity: .8; }
.note-counter { text-align: right; color: var(--lab-muted); font-size: 11px; margin: 5px 0 16px; }
.notebook-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.storage-status, .records-status { font-size: 13px; color: var(--lab-text); overflow-wrap: anywhere; }
.storage-status[data-tone="error"], .records-status[data-tone="error"] { color: var(--lab-warning); }
.workspace-help { color: var(--lab-muted); font-size: 12px; line-height: 1.8; }
.experiment-records { display: grid; gap: 10px; max-height: 480px; overflow-y: auto; margin: 18px 0 0; padding: 0; list-style: none; }
.experiment-records li { padding: 14px; background: var(--lab-surface-2); border: 1px solid var(--lab-line); border-radius: 10px; overflow-wrap: anywhere; }
.records-empty { color: var(--lab-muted); font-size: 13px; line-height: 1.8; }
.record-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.record-heading strong { font-size: 14px; font-weight: 600; }
.record-score { white-space: nowrap; color: var(--lab-accent); font-size: 15px; }
.record-details { margin: 7px 0; color: var(--lab-muted); font-size: 12px; line-height: 1.7; }
.record-footer { display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: 11px; color: var(--lab-muted); }
.record-result[data-passed="true"] { color: #a8bf8d; }
.challenge-bests { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin-top: 16px; }
.challenge-bests div { padding: 10px; background: var(--lab-bg); border-radius: 8px; font-size: 11px; color: var(--lab-muted); }
.challenge-bests strong { display: block; color: var(--lab-text); font-size: 13px; margin-top: 4px; }
.file-button[aria-disabled="true"] { opacity: .4; cursor: default; }
input:focus-visible, textarea:focus-visible { outline: 2px solid var(--lab-accent); outline-offset: 3px; }
@media (max-width: 900px) { .learning-workspace { grid-template-columns: 1fr; } }
@media (max-width: 540px) {
    .learning-coach, .notebook-panel, .records-panel { padding: 18px; }
    .coach-heading h2, .learning-workspace h2 { font-size: 20px; }
    .learning-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px; }
    .learning-steps li { padding: 8px 4px; }
    .coach-actions .button { flex: 1; min-width: 125px; }
    .notebook-actions .button { width: 100%; }
    .records-panel .extension-heading { flex-wrap: wrap; gap: 10px; }
}