.exercise-page { max-width: 920px; padding-top: 46px; padding-bottom: 68px; }
.exercise-page h1 { font-size: clamp(2rem,4vw,3rem); margin: 16px 0 22px; }
.exercise-page h2 { font-size: 1.55rem; margin: 32px 0 16px; }
.exercise-page p + p { margin-top: 14px; }
.exercise-source { background: var(--sage); border: 1px solid var(--line); padding: 24px; border-radius: 14px; }
.exercise-source pre, .original-source { white-space: pre-wrap; overflow-wrap: anywhere; font: inherit; font-size: .9rem; line-height: 1.65; }
.original-source { margin: 16px 0 0; border-left: 3px solid var(--forest); padding: 0 0 0 16px; }
.exercise-source details { margin-top: 18px; }
.clock-note, .storage-note { padding: 18px; border: 1px solid var(--line); border-radius: 10px; background: var(--white); }
.clock-note { margin: 24px 0; }
#answer-form label { display: block; font-weight: 600; margin-top: 24px; }
#answer-form textarea, #answer-form input { width: 100%; padding: 12px; border: 1px solid #a7b5a5; border-radius: 8px; color: var(--ink); background: var(--white); font: inherit; margin-top: 10px; }
#answer-form textarea { min-height: 130px; resize: vertical; }
#answer-form input:focus-visible, #answer-form textarea:focus-visible, button:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.exercise-page button { font: inherit; cursor: pointer; border: 1px solid var(--forest); }
.exercise-page button:disabled { opacity: .55; cursor: default; }
.exercise-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 20px 0; }
#save-message { min-height: 1.7em; margin: 14px 0; font-weight: 600; }
#saved-versions details { border: 1px solid var(--line); border-radius: 8px; margin-top: 12px; padding: 14px; }
#saved-versions li { white-space: pre-wrap; overflow-wrap: anywhere; padding-block: 6px; }
.exercise-end { border-top: 1px solid var(--line); margin-top: 40px; padding-top: 24px; }
@media (max-width:600px) { .exercise-page { padding-top: 28px; } .exercise-source { padding: 16px; } .exercise-actions button { width:100%; } }