/* Ansicht 学习 (Lernsitzung). Präfix lp-ls-. Aufbau und Optik nach docs/lernsitzung-entwurf.html.
   Farbe = Tiefe des Asts (--lp-ls-d0 … d3); --c ist die Farbe des gerade offenen Asts. */
:root { --lp-ls-d0: #2f5d8a; --lp-ls-d1: #6a5acd; --lp-ls-d2: #c46a1a; --lp-ls-d3: #b23b3b; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --lp-ls-d0: #7fb0e0; --lp-ls-d1: #a99bf0; --lp-ls-d2: #e6a15e; --lp-ls-d3: #e57d7d; }
}
:root[data-theme="dark"] { --lp-ls-d0: #7fb0e0; --lp-ls-d1: #a99bf0; --lp-ls-d2: #e6a15e; --lp-ls-d3: #e57d7d; }

.lp-host.view.lp-ls-host, .lp-app.mobile .lp-host.view.lp-ls-host { padding: 0; overflow: hidden; display: flex; background: var(--bg); container-type: inline-size; }

.lp-ls { --c: var(--lp-ls-d0); position: relative; flex: 1; min-width: 0; min-height: 0; height: 100%;
  display: grid; grid-template-columns: 290px minmax(0, 1fr); background: var(--bg); color: var(--fg); font: 15px/1.5 var(--font); }
.lp-ls button { font: inherit; color: inherit; }
.lp-ls :focus-visible, .lp-ls-fork button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.lp-ls-hint { font-size: .78rem; color: var(--muted); }
.lp-ls-hint kbd { font: .72rem var(--mono); border: 1px solid var(--border); border-radius: 4px; padding: 0 4px; }
.lp-ls-pad { padding: 0 8px; margin: 0; }
.lp-ls-inline > :first-child { margin-top: 0; }
.lp-ls-folder { flex: none; padding: 0 7px; border-radius: 999px; font-size: .72rem; font-weight: 500; color: var(--accent); background: var(--accent-soft); }
.lp-ls-pulse { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--c, var(--accent)); flex: none; animation: lp-ls-pulse 1.2s ease-in-out infinite; }
@keyframes lp-ls-pulse { 50% { opacity: .3; } }

/* ---------- Knöpfe */
.lp-ls-btn { border: 1px solid var(--border); background: var(--bg-elev); border-radius: 8px; padding: 5px 11px; cursor: pointer; font-size: .85rem; white-space: nowrap; color: var(--fg); }
.lp-ls-btn:hover:not(:disabled) { border-color: var(--c, var(--accent)); }
.lp-ls-btn.primary { background: var(--c); border-color: var(--c); color: var(--bg-elev); }
.lp-ls-btn.danger { background: var(--bad); border-color: var(--bad); color: var(--bg-elev); }
.lp-ls-btn:disabled { opacity: .55; cursor: default; }
.lp-ls-btn[hidden] { display: none; }
.lp-ls-icon { display: inline-grid; place-items: center; width: 30px; height: 30px; border: 0; border-radius: 6px; background: none; color: var(--muted); cursor: pointer; }
.lp-ls-icon:hover { background: var(--accent-soft); color: var(--fg); }

/* ---------- Gliederung */
.lp-ls-outline { border-right: 1px solid var(--border); background: var(--bg-elev); overflow: auto; padding: 12px 10px 40px; min-height: 0; }
.lp-ls-ol-head { display: flex; align-items: center; gap: 8px; padding: 0 4px 10px; }
.lp-ls-ol-back { border: 0; background: none; color: var(--muted); padding: 2px 6px; border-radius: 6px; cursor: pointer; font-size: .82rem; }
.lp-ls-ol-back:hover { background: var(--accent-soft); color: var(--fg); }
.lp-ls-ol-title { font-weight: 700; flex: 1; }
.lp-ls-ol-goal { margin: 0 8px 10px; font-family: var(--font-read); font-size: .95rem; line-height: 1.35; overflow-wrap: anywhere; }
.lp-ls-ol-label { font-size: .68rem; letter-spacing: .08em; color: var(--muted); font-weight: 600; padding: 0 8px; margin: 10px 0 4px; }
.lp-ls-ol-item { display: flex; align-items: center; gap: 7px; width: 100%; border: 0; background: none; text-align: left;
  padding: 5px 8px; border-radius: 7px; cursor: pointer; font-size: .88rem; min-width: 0; color: var(--fg); }
.lp-ls-ol-item:hover { background: var(--accent-soft); }
.lp-ls-ol-item .t { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; flex: 1; }
.lp-ls-ol-item .t .katex { font-size: 1em; }
.lp-ls-ol-item.node { font-weight: 600; margin-top: 6px; }
.lp-ls-ol-item.active { background: color-mix(in srgb, var(--c, var(--accent)) 16%, transparent); box-shadow: inset 3px 0 0 var(--c, var(--accent)); }
.lp-ls-ol-item.later { color: var(--muted); }
.lp-ls-ol-item.picked { box-shadow: inset 3px 0 0 var(--lp-ls-d0); }
.lp-ls-ol-item.main .lp-ls-branch { font-size: .6rem; }
.lp-ls-dot { width: 9px; height: 9px; border-radius: 50%; flex: none; border: 2px solid var(--muted); }
.lp-ls-dot.done { background: var(--ok); border-color: var(--ok); }
.lp-ls-dot.now { border-color: var(--accent); background: var(--accent-soft); box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 25%, transparent); }
.lp-ls-dot.seen { border-color: var(--accent); }
.lp-ls-qbadge { flex: none; font: 600 .7rem/1 var(--mono); padding: 3px 5px; border-radius: 5px; background: color-mix(in srgb, var(--fg) 7%, transparent); }
.lp-ls-qbadge.ok { background: color-mix(in srgb, var(--ok) 20%, transparent); color: var(--ok); }
.lp-ls-qbadge.bad { background: color-mix(in srgb, var(--bad) 18%, transparent); color: var(--bad); }
.lp-ls-req { flex: none; display: inline-grid; place-items: center; width: 20px; height: 20px; border-radius: 5px; font-size: .74rem; font-weight: 600;
  border: 1px dashed var(--muted); color: var(--muted); }
.lp-ls-req.must { border-style: solid; border-color: var(--fg); color: var(--fg); font-weight: 700; }
.lp-ls-req.ok { border: 1px solid var(--ok); background: var(--ok); color: var(--bg-elev); }
.lp-ls-req.bad { border: 1px solid var(--bad); background: var(--bad); color: var(--bg-elev); }
.lp-ls-branch { flex: none; font-weight: 700; color: var(--c); }
.lp-ls-ol-sub { margin-left: 14px; border-left: 1px solid var(--border); padding-left: 4px; }
.lp-ls-ol-item .st { flex: none; font-size: .72rem; color: var(--muted); }
.lp-ls-ol-item .st.done { color: var(--ok); }
.lp-ls-backdrop { display: none; }

/* ---------- Chat */
.lp-ls-chat { display: flex; flex-direction: column; min-width: 0; min-height: 0; height: 100%; background: var(--bg); }
.lp-ls-bar { display: flex; align-items: center; gap: 10px; padding: 9px 20px; border-bottom: 1px solid var(--border);
  background: var(--bg-elev); box-shadow: inset 0 3px 0 var(--c); flex-wrap: wrap; flex: none; }
.lp-ls-crumbs { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; min-width: 0; flex: 1; font-size: .88rem; }
.lp-ls-crumb { border: 0; background: none; padding: 2px 6px; border-radius: 6px; cursor: pointer; color: var(--cc); max-width: 220px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lp-ls-crumb:hover { background: var(--accent-soft); }
.lp-ls-crumb.cur { font-weight: 700; cursor: default; }
.lp-ls-crumb.cur:hover { background: none; }
.lp-ls-sep { color: var(--muted); }
.lp-ls-menu { display: none; }

.lp-ls-scroll { flex: 1; min-height: 0; overflow: auto; }
.lp-ls-msgs { max-width: 760px; margin: 0 auto; padding: 18px max(16px, env(safe-area-inset-right, 0px)) 24px max(16px, env(safe-area-inset-left, 0px)); display: flex; flex-direction: column; gap: 14px; }
.lp-ls-thread, .lp-ls-own, .lp-ls-tail, .lp-ls-live { display: flex; flex-direction: column; gap: 14px; }
.lp-ls-live:empty, .lp-ls-tail:empty { display: none; }
.lp-ls-ctx { display: flex; flex-direction: column; gap: 14px; opacity: .55; transition: opacity .15s; }
.lp-ls-ctx:hover, .lp-ls-ctx:focus-within { opacity: 1; }
.lp-ls-ctx-lbl { display: flex; align-items: center; gap: 10px; font-size: .74rem; font-weight: 600; color: var(--lc); }
.lp-ls-ctx-lbl::after { content: ""; height: 1px; flex: 1; background: color-mix(in srgb, var(--lc) 40%, transparent); }
.lp-ls-ctx-more { align-self: center; }
.lp-ls-origin { border-left: 3px solid var(--c); background: color-mix(in srgb, var(--c) 8%, transparent); border-radius: 0 10px 10px 0; padding: 10px 14px; display: grid; gap: 4px; justify-items: start; }
.lp-ls-origin .lbl { font-size: .72rem; font-weight: 600; letter-spacing: .05em; color: var(--c); }
.lp-ls-origin q { font-family: var(--font-read); font-size: 1rem; }
.lp-ls-crumb.from { font-size: .8rem; padding: 0; max-width: 100%; }
.lp-ls-divider { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: .78rem; font-weight: 600; letter-spacing: .04em; margin-top: 8px; }
.lp-ls-divider::before, .lp-ls-divider::after { content: ""; height: 1px; background: var(--border); flex: 1; }

.lp-ls-msg { display: grid; gap: 4px; min-width: 0; }
.lp-ls-msg .who { font-size: .72rem; color: var(--muted); font-weight: 600; }
.lp-ls-msg.user { justify-items: end; }
.lp-ls-msg.user .body { background: color-mix(in srgb, var(--c) 13%, var(--bg-elev)); border-radius: 14px 14px 4px 14px; padding: 8px 13px; max-width: 85%; white-space: pre-wrap; overflow-wrap: anywhere; }
.lp-ls-msg.ai .body { font-family: var(--font-read); font-size: 1.02rem; line-height: 1.6; min-width: 0; }
.lp-ls-msg.ai .body ::selection { background: color-mix(in srgb, var(--c) 30%, transparent); }
.lp-ls-md { overflow-wrap: anywhere; }
.lp-ls-md > :first-child { margin-top: 0; }
.lp-ls-md > :last-child { margin-bottom: 0; }
.lp-ls-md p { margin: 0 0 .6em; }
.lp-ls-md pre { overflow: auto; padding: 8px 10px; border-radius: 8px; background: color-mix(in srgb, var(--fg) 6%, transparent); font-size: .82rem; }
.lp-ls-md .katex-display { overflow-x: auto; overflow-y: hidden; }
.lp-ls-md img { max-width: 100%; }
.lp-ls-md table { border-collapse: collapse; display: block; overflow-x: auto; }
.lp-ls-md th, .lp-ls-md td { border: 1px solid var(--border); padding: 3px 8px; }
mark.lp-ls-anc { background: color-mix(in srgb, var(--mc) 16%, transparent); color: inherit; border-bottom: 2px solid var(--mc); cursor: pointer; border-radius: 3px 3px 0 0; padding: 0 1px; }
mark.lp-ls-anc:hover { background: color-mix(in srgb, var(--mc) 28%, transparent); }
mark.lp-ls-anc sup { font: 700 .68rem var(--font); color: var(--mc); margin-left: 2px; }
mark.lp-ls-imp { background: color-mix(in srgb, #f5c518 38%, transparent); color: inherit; cursor: pointer; border-radius: 3px; padding: 0 1px; }
mark.lp-ls-imp:hover { background: color-mix(in srgb, #f5c518 55%, transparent); }
.lp-ls-flash { animation: lp-ls-flash 1.4s ease-out; border-radius: 8px; }
@keyframes lp-ls-flash { 0% { box-shadow: 0 0 0 4px color-mix(in srgb, var(--c) 45%, transparent); } 100% { box-shadow: 0 0 0 4px transparent; } }
.lp-ls-error { padding: 6px 10px; border-radius: 8px; color: var(--bad); background: color-mix(in srgb, var(--bad) 9%, transparent); font-size: .85rem; }
.lp-ls-warn { padding: 4px 10px; border-radius: 8px; color: var(--warn); background: color-mix(in srgb, var(--warn) 10%, transparent); font-size: .78rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lp-ls-typing { display: flex; align-items: center; gap: 8px; color: var(--muted); font-style: italic; font-size: .9rem; }

.lp-ls-note { display: flex; gap: 10px; align-items: flex-start; border: 1px solid color-mix(in srgb, var(--mc) 40%, var(--border)); border-left: 3px solid var(--mc);
  background: color-mix(in srgb, var(--mc) 6%, var(--bg-elev)); border-radius: 0 10px 10px 0; padding: 8px 12px; cursor: pointer; text-align: left; width: 100%; color: var(--fg); }
.lp-ls-note:hover { background: color-mix(in srgb, var(--mc) 12%, var(--bg-elev)); }
.lp-ls-note.pending { cursor: default; opacity: .8; }
.lp-ls-note .k { font-size: .72rem; font-weight: 700; color: var(--mc); white-space: nowrap; }
.lp-ls-note .s { font-size: .9rem; min-width: 0; overflow-wrap: anywhere; }

/* ---------- Quizkarten */
.lp-ls-quiz { border: 1px solid var(--border); background: var(--bg-elev); border-radius: 12px; padding: 12px 14px; display: grid; gap: 8px; font-family: var(--font); font-size: .95rem; line-height: 1.5; }
.lp-ls-quiz .qh { display: flex; gap: 8px; align-items: baseline; }
.lp-ls-quiz .qh .lp-ls-req, .lp-ls-quiz .qh .lp-ls-qbadge { position: relative; top: -1px; }
.lp-ls-quiz .qt { font-weight: 600; min-width: 0; overflow-wrap: anywhere; }
.lp-ls-quiz.missing { display: flex; align-items: center; gap: 6px; }
.lp-ls-opts { display: grid; gap: 6px; }
.lp-ls-opt { display: flex; gap: 8px; align-items: baseline; text-align: left; border: 1px solid var(--border); background: var(--bg); border-radius: 8px; padding: 6px 10px; cursor: pointer; min-height: 36px; color: var(--fg); }
.lp-ls-opt:hover:not(:disabled) { border-color: var(--accent); }
.lp-ls-opt b { font-family: var(--mono); flex: none; }
.lp-ls-opt.on { border-color: var(--accent); background: var(--accent-soft); }
.lp-ls-opt.chosen { border-color: var(--accent); }
.lp-ls-opt.right { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 12%, var(--bg)); }
.lp-ls-opt.right { border-width: 2px; }
.lp-ls-opt.right::after { content: "✓"; margin-left: auto; color: var(--ok); font-weight: 700; }
.lp-ls-opt.right.missed { border-style: dashed; }
.lp-ls-opt.right.missed::after { content: "✓ 漏选"; font-size: .78rem; }
.lp-ls-opt.wrong { border: 2px solid var(--bad); background: color-mix(in srgb, var(--bad) 22%, var(--bg)); }
.lp-ls-opt.wrong::after { content: "✗ 你选了"; margin-left: auto; color: var(--bad); font-weight: 700; font-size: .78rem; }
.lp-ls-opt:disabled { cursor: default; }
.lp-ls-optwrap { display: grid; gap: 3px; }
.lp-ls-optwrap .lp-ls-opt { width: 100%; }
.lp-ls-why { font-size: .86rem; color: var(--muted); padding: 0 10px 2px 34px; border-left: 2px solid transparent; margin-left: 4px; }
.lp-ls-why.right { border-left-color: var(--ok); }
.lp-ls-why.wrong { border-left-color: var(--bad); }
.lp-ls-qfb { font-size: .9rem; display: grid; gap: 6px; }
.lp-ls-qfb .ok { color: var(--ok); }
.lp-ls-qfb .bad { color: var(--bad); }
.lp-ls-qfb details summary, .lp-ls-peek summary { cursor: pointer; color: var(--muted); font-size: .82rem; }
.lp-ls-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.lp-ls-qtext { width: 100%; resize: vertical; font: inherit; color: var(--fg); background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 7px 10px; min-height: 42px; }
.lp-ls-qtext:focus { outline: none; border-color: var(--c); box-shadow: 0 0 0 3px color-mix(in srgb, var(--c) 20%, transparent); }
.lp-ls-peek { font-size: .88rem; }

/* ---------- Jobs / Plots */
.lp-ls-job { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; font-size: .82rem; color: var(--muted); font-family: var(--font); }
.lp-ls-job.bad { color: var(--bad); }
.lp-ls-plot { margin: 4px 0 0; display: grid; gap: 4px; }
.lp-ls-plot-btn { border: 1px solid var(--border); border-radius: 10px; background: #fff; padding: 6px; cursor: zoom-in; justify-self: start; max-width: 100%; }
.lp-ls-plot img { display: block; max-width: 100%; max-height: 420px; height: auto; }
.lp-ls-plot figcaption { font-size: .78rem; color: var(--muted); font-family: var(--font); }
.lp-ls-file { padding: 1px 8px; border: 1px solid var(--border); border-radius: 999px; background: var(--bg-elev); color: var(--accent); font-size: .78rem; cursor: pointer; }

/* ---------- Sprungkarte */
.lp-ls-jump { display: flex; gap: 12px; align-items: center; justify-content: space-between; flex-wrap: wrap; border: 1px dashed var(--lp-ls-d0); border-radius: 12px; padding: 12px 14px;
  background: color-mix(in srgb, var(--lp-ls-d0) 7%, var(--bg-elev)); }
.lp-ls-jump > div:first-child { display: grid; gap: 2px; min-width: 0; }
.lp-ls-jump .lbl { font-size: .72rem; font-weight: 600; letter-spacing: .05em; color: var(--lp-ls-d0); }
.lp-ls-jump .row { display: flex; gap: 8px; }
.lp-ls-jump .lp-ls-btn.primary { background: var(--lp-ls-d0); border-color: var(--lp-ls-d0); }

/* ---------- Eingabe: gleiche Farbe wie der Chat, keine Trennlinie; nur das Feld hat einen Rahmen */
.lp-ls-composer { flex: none; background: var(--bg); border: 0; padding: 6px max(16px, env(safe-area-inset-right, 0px)) calc(10px + env(safe-area-inset-bottom, 0px)) max(16px, env(safe-area-inset-left, 0px)); }
.lp-ls-comp-in { max-width: 760px; margin: 0 auto; display: grid; gap: 8px; }
.lp-ls-chips { display: flex; gap: 6px; flex-wrap: wrap; }
.lp-ls-chips[hidden] { display: none; }
.lp-ls-chip { border: 1px dashed color-mix(in srgb, var(--c) 60%, var(--border)); background: none; border-radius: 999px; padding: 3px 10px; font-size: .82rem; cursor: pointer; color: var(--c); }
.lp-ls-chip:hover { border-style: solid; }
.lp-ls-comp-row { display: flex; gap: 8px; align-items: flex-end; }
.lp-ls-input { flex: 1; min-width: 0; resize: none; font: inherit; color: var(--fg); background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 8px 11px; min-height: 42px; max-height: 160px; line-height: 1.45; }
.lp-ls-input:focus { outline: none; border-color: var(--c); box-shadow: 0 0 0 3px color-mix(in srgb, var(--c) 20%, transparent); }
.lp-ls-comp-row .lp-ls-btn { min-height: 42px; padding: 0 16px; }

.lp-ls-fork { position: fixed; z-index: 60; display: flex; gap: 4px; background: var(--fg); color: var(--bg); border-radius: 8px; padding: 4px; box-shadow: 0 4px 18px rgba(0,0,0,.2); }
.lp-ls-fork[hidden] { display: none; }
.lp-ls-fork button { border: 0; background: none; color: var(--bg); padding: 4px 10px; border-radius: 6px; cursor: pointer; font: inherit; font-size: .85rem; white-space: nowrap; }
.lp-ls-fork button:hover { background: color-mix(in srgb, var(--bg) 18%, transparent); }

/* ---------- Liste der Lernsitzungen */
.lp-ls-listview { flex: 1; overflow: auto; background: var(--bg); }
.lp-ls-list { max-width: 720px; margin: 0 auto; padding: 28px 16px 40px; display: grid; gap: 10px; }
.lp-ls-list-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.lp-ls-list-head h2 { margin: 0; }
.lp-ls-list-head .lp-ls-btn.primary { --c: var(--lp-ls-d0); }
.lp-ls-rows { display: grid; border: 1px solid var(--border); border-radius: 12px; background: var(--bg-elev); overflow: hidden; }
.lp-ls-list-row { display: flex; align-items: center; gap: 2px; padding-right: 6px; border-top: 1px solid var(--border); }
.lp-ls-list-row:first-child { border-top: 0; }
.lp-ls-list-row:hover { background: var(--accent-soft); }
.lp-ls-list-open { flex: 1; min-width: 0; display: grid; gap: 2px; padding: 10px 14px; border: 0; background: none; text-align: left; cursor: pointer; color: var(--fg); font: inherit; }
.lp-ls-list-title { display: flex; align-items: center; gap: 7px; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lp-ls-list-meta { display: flex; align-items: center; gap: 6px; font-size: .8rem; color: var(--muted); }
.lp-ls-center { flex: 1; display: grid; place-items: center; padding: 24px; background: var(--bg); }
.lp-ls-empty { text-align: center; color: var(--muted); }
.lp-ls-dlg { display: grid; gap: 6px; min-width: min(420px, 80vw); }
.lp-ls-dlg select, .lp-ls-dlg textarea { width: 100%; font: inherit; }

/* ---------- Schmal (Handy oder schmale Tab-Gruppe): Gliederung als Schublade */
@container (max-width: 700px) {
  .lp-ls { grid-template-columns: 1fr; }
  .lp-ls-outline { position: absolute; inset: 0 auto 0 0; width: min(86%, 320px); z-index: 20; transform: translateX(-102%); transition: transform .2s; box-shadow: 0 0 30px rgba(0,0,0,.25);
    padding-left: max(10px, env(safe-area-inset-left, 0px)); visibility: hidden; }
  .lp-ls.ol-open .lp-ls-outline { transform: none; visibility: visible; }
  .lp-ls.ol-open .lp-ls-backdrop { display: block; position: absolute; inset: 0; z-index: 19; background: rgba(0,0,0,.25); }
  .lp-ls-menu { display: inline-block; }
  .lp-ls-bar { padding: 8px max(12px, env(safe-area-inset-left, 0px)); gap: 8px; }
  .lp-ls-crumb { max-width: 150px; }
  .lp-ls-hide-sm { display: none; }
  .lp-ls-input { font-size: 16px; }
  .lp-ls-ol-item { padding: 8px; }
  .lp-ls-opt { min-height: 42px; }
}
@media (prefers-reduced-motion: reduce) { .lp-ls-flash { animation: none; } .lp-ls-outline { transition: none; } .lp-ls-pulse { animation: none; } }