/* ===== 互动练习组件（原创中文重实现）===== */
.activity-box { padding: 24px 28px; }
.activity-box h3 { font-size: 16px; color: var(--navy); margin: 22px 0 10px; padding-bottom: 6px; border-bottom: 2px solid #EEF0F5; }
.activity-box h3:first-child { margin-top: 0; }
.activity-box p { margin: 8px 0; font-size: 14.5px; }
.activity-box ul { padding-left: 22px; margin: 8px 0; }
.activity-box li { margin: 6px 0; font-size: 14.5px; }
.activity-src { font-size: 12px; color: var(--muted); margin: -8px 0 16px 4px; }

.act-hint { font-size: 13px; color: var(--muted); background: #F0F2F7; border-radius: 8px; padding: 8px 12px; margin: 10px 0; }
.act-note { margin-top: 10px; padding: 10px 14px; font-size: 13.5px; background: #FFF7ED; border-left: 3px solid var(--orange); border-radius: 0 8px 8px 0; }
.act-btn {
  padding: 8px 16px; border-radius: 8px; border: 0; font-size: 13.5px;
  cursor: pointer; font-family: inherit; background: var(--orange); color: #fff;
}
.act-btn:hover { background: #D66A26; }
.act-btn:disabled { background: #CBD5E1; cursor: default; }
.act-btn.ghost { background: #E8EBF2; color: var(--navy); }
.act-btn.ghost:hover { background: #DCE0EA; }

/* ---- Markov ---- */
.mkv-sent { display: flex; align-items: center; gap: 10px; padding: 7px 12px; margin: 5px 0; border-radius: 8px; background: #FAFBFD; border: 1.5px solid #E5E9F2; font-size: 14px; transition: all .2s; }
.mkv-sent.trained { border-color: var(--green); background: #F0FDF4; }
.mkv-sent .tag { font-size: 11px; color: var(--muted); margin-left: auto; flex-shrink: 0; }
.mkv-sent.trained .tag { color: var(--green); font-weight: 600; }
.mkv-matrix-wrap { overflow-x: auto; margin: 12px 0; border: 1px solid #E5E9F2; border-radius: 8px; }
.mkv-matrix { border-collapse: collapse; font-size: 12px; min-width: 100%; }
.mkv-matrix th, .mkv-matrix td { padding: 5px 8px; text-align: center; border: 1px solid #EEF0F5; white-space: nowrap; }
.mkv-matrix th { background: var(--navy); color: #fff; font-weight: 600; position: sticky; top: 0; }
.mkv-matrix td.ctx { background: #F0F2F7; font-weight: 600; color: var(--navy); text-align: left; }
.mkv-matrix td.hit { background: #FDEBDC; color: var(--navy); font-weight: 700; }
.mkv-matrix td.zero { color: #D1D5DB; }
.mkv-matrix tr.cur-row td { outline: 2px solid var(--orange); outline-offset: -2px; }
.mkv-toggle { display: inline-flex; gap: 0; margin: 6px 0; border: 1.5px solid var(--navy); border-radius: 8px; overflow: hidden; }
.mkv-toggle button { padding: 6px 14px; border: 0; background: #fff; color: var(--navy); font-size: 12.5px; cursor: pointer; font-family: inherit; }
.mkv-toggle button.on { background: var(--navy); color: #fff; }
.mkv-seq { min-height: 46px; padding: 10px 14px; background: var(--navy); border-radius: 10px; color: #fff; font-size: 16px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 10px 0; }
.mkv-seq .tok { background: var(--navy-light); padding: 3px 10px; border-radius: 6px; }
.mkv-seq .tok.special { background: transparent; color: #8FA3C8; font-size: 12px; border: 1px dashed #8FA3C8; }
.mkv-cands { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
.mkv-cand { padding: 8px 14px; border: 1.5px solid var(--orange); border-radius: 8px; background: #FFF7ED; cursor: pointer; font-size: 14px; font-family: inherit; color: var(--navy); }
.mkv-cand:hover { background: var(--orange); color: #fff; }
.mkv-cand .pct { font-size: 11px; opacity: .75; margin-left: 5px; }
.mkv-done-sent { font-size: 17px; font-weight: 600; color: var(--navy); padding: 12px 16px; background: #F0FDF4; border: 1.5px solid var(--green); border-radius: 10px; margin: 10px 0; }

/* ---- Embedding ---- */
.emb-canvas-wrap { position: relative; width: 100%; border: 1.5px solid #E5E9F2; border-radius: 12px; background: linear-gradient(180deg, #FAFBFD, #F3F5FA); overflow: hidden; margin: 12px 0; }
.emb-canvas-wrap svg { display: block; width: 100%; height: auto; }
.emb-word { cursor: pointer; }
.emb-word circle { fill: var(--navy); transition: all .25s; }
.emb-word text { font-size: 4.2px; fill: var(--navy); font-weight: 600; }
.emb-word:hover circle { fill: var(--orange); r: 1.8; }
.emb-word.sel circle { fill: var(--orange); r: 2; }
.emb-word.near circle { fill: var(--orange-light); r: 1.7; }
.emb-word.dim circle { fill: #C7CEDC; }
.emb-word.dim text { fill: #B0B9CB; }
.emb-link { stroke: var(--orange); stroke-width: .4; stroke-dasharray: 1.2 .8; opacity: .8; }
.emb-readout { font-size: 13.5px; padding: 10px 14px; background: #F0F2F7; border-radius: 8px; min-height: 42px; }
.emb-readout b { color: var(--orange); }
.emb-dim-panel { margin-top: 8px; padding: 14px 16px; border: 1.5px solid #E5E9F2; border-radius: 12px; background: #FAFBFD; }
.emb-dim-row { display: flex; align-items: center; gap: 14px; font-size: 13.5px; }
.emb-dim-row input[type=range] { flex: 1; accent-color: var(--orange); }
.emb-dim-val { font-weight: 700; color: var(--orange); min-width: 86px; text-align: right; font-variant-numeric: tabular-nums; }
.emb-dim-svg circle { transition: cy .45s ease; }
.emb-sep-bar { height: 8px; background: #E5E7EB; border-radius: 4px; overflow: hidden; margin-top: 8px; }
.emb-sep-bar > div { height: 100%; background: linear-gradient(90deg, var(--orange), var(--green)); border-radius: 4px; transition: width .4s; }

/* ---- Context decay ---- */
.ctx-row { display: flex; align-items: center; gap: 14px; font-size: 13.5px; margin: 10px 0 4px; }
.ctx-row input[type=range] { flex: 1; accent-color: var(--orange); }
.ctx-row .val { font-weight: 700; color: var(--orange); min-width: 96px; text-align: right; font-variant-numeric: tabular-nums; }
.ctx-doc { position: relative; height: 34px; border-radius: 8px; background: repeating-linear-gradient(90deg, #DCE3F0 0 7px, #E9EDF6 7px 14px); margin: 14px 0 4px; overflow: visible; }
.ctx-needle { position: absolute; top: -7px; bottom: -7px; width: 6px; background: var(--orange); border-radius: 3px; transform: translateX(-3px); box-shadow: 0 0 0 2px #fff; }
.ctx-needle::after { content: "关键信息"; position: absolute; top: -20px; left: 50%; transform: translateX(-50%); font-size: 11px; color: var(--orange); white-space: nowrap; font-weight: 600; }
.ctx-doc-labels { display: flex; justify-content: space-between; font-size: 11px; color: var(--muted); margin-bottom: 12px; }
.ctx-plot-wrap { border: 1.5px solid #E5E9F2; border-radius: 12px; background: #FAFBFD; padding: 12px 14px 8px; margin: 10px 0; }
.ctx-plot-wrap svg { display: block; width: 100%; height: auto; }
.ctx-curve { fill: none; stroke: var(--navy); stroke-width: 1.6; }
.ctx-fill { fill: rgba(27,42,74,.08); stroke: none; }
.ctx-marker { fill: var(--orange); }
.ctx-recall { font-size: 15px; font-weight: 700; }
.ctx-recall .num { color: var(--orange); font-size: 22px; font-variant-numeric: tabular-nums; }

/* ---- Letter vs Spirit ---- */
.lvs-scn { border: 1.5px solid #E5E9F2; border-radius: 12px; padding: 16px 18px; margin: 14px 0; background: #FAFBFD; }
.lvs-scn .scn-title { font-weight: 700; color: var(--navy); font-size: 15px; margin-bottom: 8px; }
.lvs-draft { font-size: 13px; background: #fff; border: 1px solid #E5E9F2; border-radius: 8px; padding: 10px 14px; margin: 8px 0; color: #4B5563; white-space: pre-line; }
.lvs-instr { display: inline-block; background: var(--navy); color: #fff; border-radius: 999px; padding: 4px 14px; font-size: 13.5px; margin: 6px 0; }
.lvs-guess { display: block; width: 100%; text-align: left; padding: 9px 14px; margin: 6px 0; border: 1.5px solid #D9DEE8; border-radius: 8px; background: #fff; cursor: pointer; font-size: 13.5px; font-family: inherit; color: var(--text); }
.lvs-guess:hover { border-color: var(--orange); }
.lvs-guess.picked { border-color: var(--orange); background: #FFF7ED; }
.lvs-guess:disabled { cursor: default; }
.lvs-compare { display: none; margin-top: 12px; gap: 10px; }
.lvs-compare.show { display: grid; grid-template-columns: 1fr 1fr; }
.lvs-compare .pane { border-radius: 8px; padding: 10px 14px; font-size: 13px; }
.lvs-compare .literal { background: #FEF2F2; border: 1.5px solid #FCA5A5; }
.lvs-compare .spirit { background: #F0FDF4; border: 1.5px solid #86EFAC; }
.lvs-compare .pane b { display: block; margin-bottom: 4px; font-size: 12.5px; }
.lvs-compare .literal b { color: var(--red); }
.lvs-compare .spirit b { color: var(--green); }
.lvs-better { display: none; margin-top: 10px; padding: 10px 14px; font-size: 13px; background: #FFF7ED; border-left: 3px solid var(--orange); border-radius: 0 8px 8px 0; }
.lvs-better.show { display: block; }
@media (max-width: 700px) { .lvs-compare.show { grid-template-columns: 1fr; } }

/* ---- Checklist ---- */
.ckl-bar { height: 10px; background: #E5E7EB; border-radius: 5px; overflow: hidden; margin: 10px 0 4px; }
.ckl-bar > div { height: 100%; background: linear-gradient(90deg, var(--orange), var(--green)); border-radius: 5px; transition: width .4s; }
.ckl-num { font-size: 13px; color: var(--muted); margin-bottom: 12px; }
.ckl-item { display: flex; gap: 12px; padding: 14px 16px; margin: 8px 0; border: 1.5px solid #E5E9F2; border-radius: 10px; background: #FAFBFD; cursor: pointer; transition: all .2s; }
.ckl-item:hover { border-color: var(--orange-light); }
.ckl-item.on { border-color: var(--green); background: #F0FDF4; }
.ckl-check { width: 22px; height: 22px; border-radius: 6px; border: 2px solid #CBD5E1; flex-shrink: 0; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 13px; margin-top: 2px; }
.ckl-item.on .ckl-check { background: var(--green); border-color: var(--green); }
.ckl-item .t { font-weight: 600; font-size: 14.5px; color: var(--navy); }
.ckl-item.on .t { text-decoration: line-through; opacity: .7; }
.ckl-item .d { font-size: 13px; color: var(--muted); margin-top: 2px; }


/* ============================================================
   warm-theme + dark-mode overrides (redesign) — appended layer
   ============================================================ */
.activity-box {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow-1); margin-bottom: 22px;
}
.activity-box h3 { font-family: var(--font-display); color: var(--ink); border-color: var(--line); }
.activity-box p, .activity-box li { color: var(--ink-2); }
.act-hint { background: var(--surface-2); color: var(--muted); }
.act-note { background: var(--accent-soft); border-color: var(--accent); color: var(--ink-2); }

/* Markov */
.mkv-sent { background: var(--surface-2); border-color: var(--line); color: var(--ink); }
.mkv-sent.trained { background: var(--good-soft); border-color: var(--good); }
.mkv-matrix-wrap { border-color: var(--line-2); }
.mkv-matrix th, .mkv-matrix td { border-color: var(--line); }
.mkv-matrix th { background: var(--ink); color: var(--bg); }
.mkv-matrix td.ctx { background: var(--surface-2); color: var(--ink); }
.mkv-matrix td.hit { background: var(--accent-soft); color: var(--ink); }
.mkv-matrix td.zero { color: var(--muted-2); }
.mkv-toggle { border-color: var(--ink); }
.mkv-toggle button { background: var(--surface); color: var(--ink); }
.mkv-toggle button.on { background: var(--ink); color: var(--bg); }
.mkv-seq { background: var(--ink); color: var(--bg); }
.mkv-seq .tok { background: color-mix(in srgb, var(--bg) 16%, transparent); }
.mkv-seq .tok.special { color: color-mix(in srgb, var(--bg) 55%, transparent); border-color: color-mix(in srgb, var(--bg) 40%, transparent); }
.mkv-cand { background: var(--accent-soft); border-color: var(--accent-line); color: var(--ink); }
.mkv-cand:hover { background: var(--accent); color: #fff; }
.mkv-done-sent { background: var(--good-soft); border-color: var(--good); color: var(--ink); }

/* Embedding */
.emb-canvas-wrap { background: var(--surface-2); border-color: var(--line); }
.emb-word circle { fill: var(--ink); }
.emb-word text { fill: var(--ink); }
.emb-word.dim circle { fill: var(--muted-2); }
.emb-word.dim text { fill: var(--muted-2); }
.emb-readout { background: var(--surface-2); }
.emb-dim-panel { background: var(--surface-2); border-color: var(--line); }

/* Context decay */
.ctx-doc { background: repeating-linear-gradient(90deg, var(--track) 0 7px, var(--surface-2) 7px 14px); }
.ctx-plot-wrap { background: var(--surface-2); border-color: var(--line); }
.ctx-curve { stroke: var(--ink); }
.ctx-fill { fill: color-mix(in srgb, var(--ink) 8%, transparent); }

/* Letter vs Spirit */
.lvs-scn { background: var(--surface-2); border-color: var(--line); }
.lvs-draft, .lvs-guess { background: var(--surface); border-color: var(--line); color: var(--ink-2); }
.lvs-guess:hover { border-color: var(--accent-line); }
.lvs-guess.picked { background: var(--accent-soft); border-color: var(--accent); }
.lvs-instr { background: var(--ink); color: var(--bg); }
.lvs-compare .literal { background: var(--bad-soft); border-color: var(--bad); }
.lvs-compare .spirit { background: var(--good-soft); border-color: var(--good); }
.lvs-better { background: var(--accent-soft); border-color: var(--accent); color: var(--ink-2); }

/* Checklist */
.ckl-item { background: var(--surface-2); border-color: var(--line); }
.ckl-item:hover { border-color: var(--accent-line); }
.ckl-item.on { background: var(--good-soft); border-color: var(--good); }
.ckl-check { border-color: var(--muted-2); }
.ckl-item .t { color: var(--ink); }
.ckl-item .d { color: var(--muted); }