/* Learning pages keep the common Onest / monochrome / violet UI tokens. */
.learning-unit-header { margin: 24px 0; padding: 20px; border: 1px solid var(--line); border-radius: var(--ui-radius-card); background: var(--surface); }
.learning-unit-header .unit-kicker { color: var(--accent); font-size: 12px; font-weight: 650; letter-spacing: .05em; }
.learning-unit-header h2 { margin: 8px 0; font-size: 22px; line-height: 1.3; overflow-wrap: anywhere; }
.learning-unit-header p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.6; }
.course-progress { display: flex; gap: 6px; margin: 18px 0 0; }
.course-progress span { flex: 1; height: 3px; background: var(--line); border-radius: 3px; }
.course-progress .done { background: var(--accent); }
.course-progress .current { background: var(--accent-mid); }
.learning-complete { margin-top: 24px; padding: 20px; border: 1px solid var(--accent-mid); border-radius: var(--ui-radius-card); background: var(--surface); }
.learning-complete strong { display: block; margin-bottom: 8px; font-size: 18px; }
.learning-complete p { margin: 0 0 16px; line-height: 1.6; color: var(--muted); }
.learning-archive { margin: 24px 0; }
.learning-archive summary { padding: 14px 0; color: var(--muted); cursor: pointer; min-height: 44px; }
.learning-history-list { display: grid; gap: 8px; }
.learning-history-button { display: flex; width: 100%; min-height: 56px; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 16px; text-align: left; border: 1px solid var(--line); border-radius: var(--ui-radius-control); background: var(--ui-control-bg); color: var(--ink); }
.learning-history-button span { display: grid; gap: 5px; min-width: 0; overflow-wrap: anywhere; }
.learning-history-button small { color: var(--muted); font-size: 12px; }
.learning-read-only { padding: 16px 18px; background: var(--accent-soft); border-radius: var(--ui-radius-control); color: var(--ink); font-size: 14px; line-height: 1.6; margin: 20px 0; }
.learning-read-only .button { margin-top: 14px; }
.learning-chat { margin: 24px 0; padding: 20px; border: 1px solid var(--line); border-radius: var(--ui-radius-card); background: var(--surface); }
.learning-chat h2 { margin: 0 0 6px; font-size: 20px; }
.learning-chat > p { color: var(--muted); line-height: 1.55; font-size: 14px; }
.learning-chat-modes { display: flex; padding: 5px; margin: 18px 0; gap: 6px; background: var(--raised); border-radius: var(--ui-radius-control); }
.learning-chat-modes button { flex: 1; min-height: 44px; border: 1px solid transparent; border-radius: 12px; background: none; color: var(--muted); padding: 10px; font-size: 14px; }
.learning-chat-modes button[aria-pressed="true"] { color: var(--ink); background: var(--ui-control-bg); border-color: var(--accent-mid); }
.learning-chat-messages { display: grid; gap: 12px; max-height: 480px; overflow: auto; overscroll-behavior: contain; margin: 18px 0; }
.learning-message { border-radius: 16px; padding: 16px; background: var(--raised); line-height: 1.7; overflow-wrap: anywhere; }
.learning-message-user { margin-left: 24px; background: var(--accent-soft); }
.learning-message small { display: block; color: var(--muted); font-size: 12px; margin-bottom: 6px; }
.learning-message p { margin: 0; white-space: pre-line; }
.learning-chat .field { margin-top: 16px; }
.learning-chat [role="status"] { color: var(--muted); font-size: 13px; line-height: 1.5; }
.learning-illustration { margin: 24px 0; padding: 12px; background: var(--bg); border: 1px solid var(--line); border-radius: 20px; }
.learning-illustration svg { display: block; width: 100%; height: auto; max-height: 720px; }
.illustration-node { fill: var(--surface); stroke: var(--line); }
.illustration-edge { fill: none; stroke: var(--accent-mid); stroke-width: 2; }
.illustration-title { fill: var(--ink); font-size: 17px; font-weight: 600; }
.illustration-detail { fill: var(--muted); font-size: 14px; }
.illustration-link { fill: var(--accent); font-size: 11px; }
.learning-illustration figcaption { padding: 8px 6px; font-size: 13px; line-height: 1.5; color: var(--muted); }
.illustration-description summary { padding: 12px 6px; font-size: 12px; color: var(--muted); cursor: pointer; min-height: 44px; }
.illustration-description ol, .illustration-description ul { margin: 8px 0; padding-left: 24px; font-size: 13px; line-height: 1.65; overflow-wrap: anywhere; }
.learning-tree-scroll { margin: 24px 0 10px; max-width: 100%; overflow: auto; overscroll-behavior: contain; border: 1px solid var(--line); border-radius: var(--ui-radius-card); background: var(--surface); touch-action: pan-x pan-y; }
.learning-tree { position: relative; }
.tree-edges { position: absolute; top: 0; left: 0; fill: none; stroke: var(--accent-mid); stroke-width: 1.5; }
.tree-relation { background: var(--surface); padding: 3px 5px; text-align: center; font: 12px Onest, sans-serif; color: var(--muted); line-height: 1.3; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; }
.tree-node { position: absolute; width: 212px; min-height: 92px; overflow-y: auto; display: flex; flex-direction: column; gap: 8px; padding: 14px; text-align: left; border: 1px solid var(--line); border-radius: 18px; background: var(--raised); color: var(--ink); }
.tree-node span { font-size: 11px; color: var(--muted); }
.tree-node strong { font-size: 14px; font-weight: 600; line-height: 1.4; overflow-wrap: anywhere; }
.tree-node-root { background: var(--ink); color: var(--bg); }
.tree-node-root span { color: var(--bg); }
.tree-node.is-active, .tree-node-current { border-color: var(--accent-mid); }
.tree-node-completed span { color: var(--accent); }
.tree-node-locked { opacity: .65; }
.tree-text { margin-bottom: 24px; font-size: 14px; }
.tree-text summary { cursor: pointer; min-height: 44px; padding: 12px 0; color: var(--muted); }
.tree-text ol { line-height: 1.7; padding-left: 24px; }
.learning-template-language .slide-example, .learning-template-language .example { border-left: 2px solid var(--accent); }
.learning-template-procedure .chapter-list { counter-reset: procedure; }
.learning-template-practice .exercise-detail { border-top: 2px solid var(--accent-mid); }
.learning-empty-practice { padding: 20px 0; color: var(--muted); line-height: 1.7; }
@media (min-width: 720px) { .learning-chat { padding: 24px; } .learning-message-user { margin-left: 64px; } }
@media (prefers-reduced-motion: reduce) { .learning-chat *, .tree-node { animation: none !important; transition: none !important; } }