:root{
  --bg:#f4f1ea; --ink:#1d2b3a; --muted:#68727d; --card:#fff; --line:#d9d3c6; --navy:#1f3a52;
  --tuc:#7a5aa6; --vovi:#e08a1e; --sac:#2f5d85; --tam:#c0392b; --sohuu:#2e9a58; --neu:#4a5b6c;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--bg:#161b21;--ink:#e8edf2;--muted:#9aa6b2;--card:#202831;--line:#37424e;--navy:#8fb4d6;--neu:#7e92a6;--sac:#5b8fb9}}
:root[data-theme="dark"]{--bg:#161b21;--ink:#e8edf2;--muted:#9aa6b2;--card:#202831;--line:#37424e;--navy:#8fb4d6;--neu:#7e92a6;--sac:#5b8fb9}
*{box-sizing:border-box}
html{font-size:106%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Segoe UI",system-ui,sans-serif;line-height:1.4}
header{display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap;padding:10px 14px 2px;text-align:center}
.brand{display:flex;gap:12px;align-items:center;text-align:left}
.brand img{height:46px;width:auto}
h1{margin:0;font-size:1.4rem;color:var(--navy)}
header p{margin:2px 0 0;color:var(--muted);font-size:.85rem}
.back{font-weight:700;color:var(--navy);text-decoration:none;border:1.5px solid var(--navy);border-radius:999px;padding:6px 14px;font-size:.9rem}
.lessonNav{display:flex;gap:6px;justify-content:center;flex-wrap:wrap;padding:6px 12px}
.lessonNav a{font-size:.85rem;font-weight:700;text-decoration:none;color:var(--navy);border:1.5px solid var(--navy);border-radius:999px;padding:4px 12px}
.lessonNav a.on{background:var(--navy);color:var(--bg)}
.page{max-width:1500px;margin:0 auto;padding:6px 12px 30px}
.cap{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:8px 14px;font-size:.98rem;min-height:2.6rem;display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.cap .no{background:var(--navy);color:var(--bg);border-radius:999px;padding:1px 10px;font-size:.8rem;font-weight:700;white-space:nowrap}
.cap b{color:var(--navy)}
.canvas{margin-top:8px;height:calc(100vh - 380px);min-height:340px;background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:auto;cursor:grab;position:relative}
.canvas.drag{cursor:grabbing}
svg{display:block}
.n{cursor:pointer}
.n rect{fill:var(--c);fill-opacity:.14;stroke:var(--c);stroke-width:1.5}
.n text{fill:var(--ink);font:600 13px "Segoe UI",system-ui,sans-serif;pointer-events:none}
.n.new rect{stroke-width:2.6;fill-opacity:.24}
.n.focus rect{fill-opacity:1;stroke-width:2.6;filter:drop-shadow(0 0 6px var(--c))}
.n.focus text{fill:#fff}
.n.hid rect{stroke-dasharray:4 3;fill-opacity:.04}
.n.sel rect{stroke:var(--ink);stroke-width:2.6}
.e{fill:none;stroke:var(--c);stroke-width:1.7}
.ctrl{display:flex;flex-wrap:wrap;gap:6px;align-items:center;justify-content:center;margin:10px 0 4px}
.ctrl button,.ctrl select{font:inherit;font-size:.9rem;padding:6px 11px;border-radius:10px;border:1.5px solid var(--navy);background:transparent;color:var(--navy);cursor:pointer;font-weight:700}
.ctrl button.on,.ctrl button.pri{background:var(--navy);color:var(--bg)}
.ctrl button:disabled{opacity:.4;cursor:default}
.ctrl .sep{width:1px;height:24px;background:var(--line);margin:0 4px}
.slider{display:flex;align-items:center;gap:10px;font-size:.85rem;color:var(--muted)}
.slider input{flex:1}
.info{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:10px}
@media (max-width:800px){.info{grid-template-columns:1fr}}
.def,.termBox{background:color-mix(in srgb,var(--navy) 8%,var(--card));border-radius:12px;padding:10px 14px;font-size:.95rem;min-height:3.2rem}
.def h2,.termBox h2{margin:0 0 4px;font-size:.95rem;color:var(--navy);display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.def h2 small{color:var(--muted);font-weight:600}
.def p{margin:3px 0;white-space:pre-line}
.def .src,.termBox .src{font-size:.75rem;color:var(--muted);margin-top:6px}
.def button{font:inherit;font-size:.8rem;border:1px solid var(--line);background:transparent;color:var(--navy);border-radius:8px;padding:1px 8px;cursor:pointer}
.trow{display:grid;grid-template-columns:62px 1fr;gap:8px;padding:5px 0;border-top:1px solid var(--line)}
.trow:first-child{border-top:0}
.trow b{font-size:.72rem;color:var(--muted);text-transform:uppercase;padding-top:3px}
.trow .pali{font-style:italic;font-weight:600;color:var(--navy)}
.trow .han{font-family:"Noto Serif TC","Microsoft JhengHei","PMingLiU",serif;font-size:1.1rem}
.srcTag{color:var(--muted);font-weight:700;font-size:.72rem}
.todo{margin-top:6px;font-size:.78rem;color:#b36b00}
.voiceInfo{font-size:.8rem;color:var(--muted);text-align:center;min-height:1.2em}
.credit{padding:10px 2px 0;color:var(--muted);font-size:.8rem}
.credit a{color:var(--navy)}
/* Toàn màn hình cho sơ đồ */
.fsWrap{background:var(--bg);padding:8px 14px;overflow:hidden}
.fsWrap:fullscreen,.fsWrap.fs{display:flex !important;flex-direction:column}
.fsWrap.fs{position:fixed;inset:0;z-index:100}
.fsWrap .canvas{flex:1;height:auto;min-height:0;margin-top:6px}
.fsWrap{position:relative}
.fsWrap .info{position:absolute;right:16px;bottom:118px;width:min(640px,50vw);max-height:44vh;overflow:auto;z-index:6;display:none;grid-template-columns:1fr;gap:8px;background:var(--card);border:2px solid var(--navy);border-radius:14px;padding:10px;box-shadow:0 10px 30px #0006}
.fsWrap .info.open{display:grid}
.fsInfoClose{display:none;position:sticky;top:0;justify-self:end;z-index:2;border:1px solid var(--line);background:var(--card);color:var(--muted);border-radius:8px;width:28px;height:28px;cursor:pointer}
.fsWrap .fsInfoClose{display:block}
.fsWrap .cap,.fsWrap .ctrl,.fsWrap .voiceInfo,.fsWrap .slider{flex:0 0 auto}