/* Khong gian hoc tap cua hoc phan – dung chung bien mau voi khung chat */
.learn { height: 100%; display: flex; flex-direction: column; max-width: 980px; margin: 0 auto; background: var(--bg); }
@media (min-width: 1000px) { .learn { border-left: 1px solid var(--border); border-right: 1px solid var(--border); } }
.learn .head { flex-wrap: wrap; }
.course-meta { font-size: .74rem; opacity: .92; }
.ltabs { display: flex; gap: 2px; background: var(--card); border-bottom: 1px solid var(--border); padding: 0 10px; overflow-x: auto; flex: none; }
.ltabs button { font: inherit; font-size: .88rem; border: 0; background: none; color: var(--muted); padding: 11px 14px; cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -1px; white-space: nowrap; }
.ltabs button[aria-selected="true"] { color: var(--brand); border-bottom-color: var(--brand); font-weight: 600; }
.panel { flex: 1; overflow-y: auto; display: flex; flex-direction: column; min-height: 0; }
.panel[hidden] { display: none !important; }
.bar { display: flex; align-items: center; gap: 8px; padding: 8px 12px; background: var(--card); border-bottom: 1px solid var(--border); flex-wrap: wrap; flex: none; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 999px; overflow: hidden; }
.seg button { font: inherit; font-size: .8rem; border: 0; background: var(--card); color: var(--muted); padding: 5px 12px; cursor: pointer; }
.seg button[aria-pressed="true"] { background: var(--brand); color: var(--brand-ink); font-weight: 600; }
.chip-q { font-size: .76rem; padding: 3px 10px; border-radius: 999px; background: var(--cite-bg); color: var(--cite-ink); font-weight: 600; }
.chip-q.low { background: var(--warn-bg); color: var(--warn-ink); }
.spacer { flex: 1; }
.banner { margin: 10px 12px 0; padding: 9px 12px; border-radius: 10px; font-size: .84rem; }
.banner.exam { background: var(--danger-bg); color: var(--danger-ink); }
.banner.staff { background: var(--warn-bg); color: var(--warn-ink); }
.panel .log { flex: 1; }

/* Khoi ma */
.msg .code { margin: 8px 0; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; background: #0f172a; }
.code-head { display: flex; justify-content: space-between; align-items: center; padding: 4px 10px; background: #1e293b; color: #cbd5e1; font-size: .72rem; font-family: Consolas, monospace; }
.code-copy { font: inherit; font-size: .72rem; background: none; border: 1px solid #475569; color: #e2e8f0; border-radius: 5px; padding: 1px 8px; cursor: pointer; }
.msg pre { margin: 0; padding: 10px 12px; overflow-x: auto; }
.msg pre code { color: #e2e8f0; font-family: Consolas, "JetBrains Mono", monospace; font-size: .8rem; line-height: 1.5; white-space: pre; }
.msg code { font-family: Consolas, monospace; font-size: .85em; background: var(--bg); padding: 1px 5px; border-radius: 4px; }
/* Ma trong khoi lenh: khong to nen tung dong nhu ma noi dong */
.msg pre code, .msg .code code { background: none; padding: 0; border-radius: 0; font-size: .84rem; color: #e2e8f0; tab-size: 4; }
.msg pre { background: #0f172a; color: #e2e8f0; line-height: 1.6; }
.msg.user { white-space: pre-wrap; font-family: inherit; }
.src a.open { font-weight: 600; text-decoration: none; }
.src .layer { font-size: .68rem; background: var(--bg); border: 1px solid var(--border); border-radius: 4px; padding: 0 5px; margin-left: 4px; }

/* Tai lieu */
.lib { padding: 14px; display: flex; flex-direction: column; gap: 14px; }
.lib h3 { margin: 0 0 6px; font-size: .92rem; color: var(--navy); }
.doc { display: grid; grid-template-columns: 54px 1fr auto; gap: 10px; align-items: center; background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 9px 12px; }
.ext { font-size: .66rem; font-weight: 700; text-align: center; border-radius: 6px; padding: 5px 0; background: var(--cite-bg); color: var(--cite-ink); font-family: Consolas, monospace; }
.doc b { font-size: .88rem; font-weight: 600; display: block; }
.doc small { color: var(--muted); font-size: .74rem; }
.btn-s { font: inherit; font-size: .8rem; border: 1px solid var(--brand); color: var(--brand); background: var(--card); border-radius: 7px; padding: 4px 11px; text-decoration: none; white-space: nowrap; }
.empty { text-align: center; color: var(--muted); padding: 30px 12px; font-size: .9rem; }

/* On tap */
.quiz { padding: 14px; display: flex; flex-direction: column; gap: 12px; }
.qcard { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 14px; }
.qcard .qn { font-size: .72rem; color: var(--muted); font-weight: 700; text-transform: uppercase; letter-spacing: .04em; }
.qcard .qt { margin: 4px 0 10px; font-weight: 600; font-size: .92rem; }
.opt { display: block; width: 100%; text-align: left; font: inherit; font-size: .86rem; border: 1px solid var(--border); background: var(--card); color: var(--text); border-radius: 9px; padding: 8px 12px; margin-top: 6px; cursor: pointer; }
.opt:hover:not(:disabled) { border-color: var(--brand); }
.opt.right { border-color: #1e8e3e; background: #e6f4ea; }
.opt.wrong { border-color: #d93025; background: #fdecea; }
.opt.chosen { border-color: var(--brand, #2387E3); background: #e8f1fd; font-weight: 600; }
.opt:disabled { cursor: default; color: var(--text); }
.expl { margin-top: 8px; font-size: .84rem; color: var(--muted); }
.score { font-weight: 700; color: var(--navy); }
select.sel { font: inherit; font-size: .84rem; padding: 5px 8px; border: 1px solid var(--border); border-radius: 7px; background: var(--card); color: var(--text); max-width: 100%; }

/* Tom tat */
.sum { padding: 14px; display: flex; flex-direction: column; gap: 10px; }
.sum details { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px; }
.sum summary { cursor: pointer; font-weight: 600; color: var(--navy); font-size: .9rem; }
.sum .msg { max-width: 100%; border: 0; padding: 8px 0 0; background: none; }

/* Dang nhap */
.gate { margin: auto; max-width: 420px; text-align: center; padding: 30px 20px; display: flex; flex-direction: column; gap: 12px; }
.gate h2 { margin: 0; color: var(--navy); font-size: 1.15rem; }
.gate p { margin: 0; color: var(--muted); font-size: .9rem; }

/* Trang Hoc phan cua toi */
.my { max-width: 980px; margin: 0 auto; padding: 18px 16px 40px; display: flex; flex-direction: column; gap: 14px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.ccard { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px; display: flex; flex-direction: column; gap: 6px; text-decoration: none; color: var(--text); }
.ccard:hover { border-color: var(--brand); }
.ccard .code-hp { font-family: Consolas, monospace; font-size: .74rem; color: var(--muted); }
.ccard b { font-size: 1rem; color: var(--navy); }
.ccard small { color: var(--muted); font-size: .78rem; }
.ccard .go { margin-top: auto; color: var(--brand); font-weight: 600; font-size: .85rem; }

/* Buoi hoc (lop hoc dao nguoc) */
.lessons { padding: 14px; display: flex; flex-direction: column; gap: 12px; }
.lhint { margin: 0; font-size: .84rem; color: var(--muted); line-height: 1.5; }
.lcard { font: inherit; text-align: left; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 14px; display: flex; flex-direction: column; gap: 6px; cursor: pointer; color: var(--text); }
.lcard:hover { border-color: var(--brand); }
.lc-top { display: flex; gap: 8px; align-items: baseline; justify-content: space-between; }
.lcard b { color: var(--navy); font-size: .98rem; }
.lcard small { color: var(--muted); font-size: .78rem; }
.lcard small.late { color: var(--danger-ink); font-weight: 600; }
.lc-prog { display: flex; align-items: center; gap: 10px; font-size: .8rem; color: var(--muted); flex-wrap: wrap; }
.pbar { flex: 1; min-width: 80px; max-width: 220px; height: 7px; background: var(--bg); border: 1px solid var(--border); border-radius: 99px; overflow: hidden; }
.pbar i { display: block; height: 100%; background: var(--brand); border-radius: 99px; }
.live { color: #c62828; font-weight: 700; font-size: .76rem; white-space: nowrap; }
.live-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: #e53935; vertical-align: middle; margin-left: 4px; animation: pulse 1.4s infinite; }
@keyframes pulse { 50% { opacity: .3; } }
@media (prefers-reduced-motion: reduce) { .live-dot { animation: none; } }
.lv { font-size: .72rem; font-weight: 700; border-radius: 99px; padding: 2px 9px; white-space: nowrap; }
.lv0 { background: var(--danger-bg); color: var(--danger-ink); }
.lv1 { background: var(--warn-bg); color: var(--warn-ink); }
.lv2 { background: var(--cite-bg); color: var(--cite-ink); }
.lv3 { background: #e6f4ea; color: #1e6b34; }
.lhead h2 { margin: 10px 0 2px; font-size: 1.1rem; color: var(--navy); }
.lhead > small { color: var(--muted); font-size: .8rem; }
.objs { margin-top: 8px; font-size: .86rem; }
.objs summary { cursor: pointer; color: var(--cite-ink); font-weight: 600; }
.objs ol { margin: 6px 0 0; padding-left: 22px; }
.steps { display: flex; flex-direction: column; gap: 12px; margin-top: 12px; }
.step { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 14px; display: flex; flex-direction: column; gap: 10px; }
.sh { display: flex; gap: 10px; align-items: center; }
.sh b { display: block; color: var(--navy); font-size: .95rem; }
.sh small { color: var(--muted); font-size: .78rem; }
.sn { width: 28px; height: 28px; flex: none; border-radius: 50%; display: grid; place-items: center; font-weight: 700; font-size: .85rem; background: var(--cite-bg); color: var(--cite-ink); }
.sn.ok { background: #1e8e3e; color: #fff; }
.lsec { border: 1px solid var(--border); border-radius: 10px; padding: 8px 12px; }
.lsec summary { cursor: pointer; font-weight: 600; font-size: .9rem; color: var(--navy); }
.lsec .msg, .steps .qt.msg { max-width: 100%; border: 0; padding: 6px 0 0; background: none; font-weight: 400; }
.lsec-act { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 6px; }
.step .btn { align-self: flex-start; }
.okline { margin: 0; color: #1e6b34; font-size: .86rem; font-weight: 600; }
.row-act { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
.chk { font-size: .78rem; color: var(--muted); display: inline-flex; gap: 4px; align-items: center; white-space: nowrap; }
.lbl { font-size: .84rem; font-weight: 600; color: var(--navy); }
.steps textarea { font: inherit; font-size: .88rem; width: 100%; border: 1px solid var(--border); border-radius: 9px; padding: 8px 10px; resize: vertical; background: var(--card); color: var(--text); }
.steps textarea.mono { font-family: Consolas, "JetBrains Mono", monospace; font-size: .82rem; }
.qa { display: flex; gap: 8px; align-items: center; margin-top: 6px; flex-wrap: wrap; }
.muted { color: var(--muted); font-size: .78rem; }
.ferr { color: var(--danger-ink); font-size: .82rem; margin-top: 6px; }
.fb { border-radius: 9px; padding: 8px 12px; margin: 8px 0; font-size: .86rem; background: var(--bg); border: 1px solid var(--border); }
.fb.good { background: #e6f4ea; border-color: #b7dfc1; }
.fb.mid { background: var(--warn-bg); border-color: #f1d9a8; }
.fb.low { background: var(--danger-bg); border-color: #f3c2bd; }
.fb .msg { max-width: 100%; border: 0; background: none; padding: 4px 0 0; }
.assess { display: flex; flex-direction: column; gap: 6px; font-size: .88rem; }
.assess p, .assess ul { margin: 0; }
.as-top { display: flex; align-items: center; gap: 10px; }
.as-top .big { font-size: 1.5rem; font-weight: 700; color: var(--navy); }
.objbars { display: flex; flex-direction: column; gap: 6px; margin: 4px 0; }
.ob { display: grid; grid-template-columns: 1fr 120px 48px; gap: 8px; align-items: center; font-size: .82rem; }
.ob .pbar { max-width: none; }
.advice { background: var(--cite-bg); color: var(--cite-ink); border-radius: 9px; padding: 8px 12px; }
.grp { background: var(--cite-bg); color: var(--cite-ink); border-radius: 10px; padding: 9px 12px; font-size: .88rem; }
.qcard.act { border-color: var(--brand); }
.posts { display: flex; flex-direction: column; gap: 6px; margin: 8px 0; }
.post { background: var(--bg); border-radius: 9px; padding: 7px 10px; font-size: .86rem; }
.post b { font-size: .8rem; color: var(--navy); }
.post small { color: var(--muted); }
.post.gv { background: var(--cite-bg); }
.post.mine { border: 1px solid var(--brand); }
.help .helps { display: flex; flex-direction: column; gap: 6px; }
.hreq { font-size: .84rem; border-radius: 8px; padding: 6px 10px; background: var(--warn-bg); color: var(--warn-ink); }
.hreq.helping { background: var(--cite-bg); color: var(--cite-ink); }
.hreq.done { background: #e6f4ea; color: #1e6b34; }
@media (max-width: 560px) { .ob { grid-template-columns: 1fr 70px 38px; } .doc { grid-template-columns: 44px 1fr; } .doc .row-act { grid-column: 1 / -1; justify-content: flex-start; } }

/* Kiem tra */
.tbar { position: sticky; top: 0; z-index: 2; display: flex; align-items: center; gap: 12px; justify-content: space-between; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 10px 14px; box-shadow: 0 2px 8px rgba(0,0,0,.05); }
#tClock { font-weight: 700; font-variant-numeric: tabular-nums; color: var(--navy); }
#tClock.low { color: var(--danger-ink); }
.opt.sel { border-color: var(--brand); background: var(--cite-bg); font-weight: 600; }
.qcard textarea { font: inherit; font-size: .88rem; width: 100%; border: 1px solid var(--border); border-radius: 9px; padding: 8px 10px; resize: vertical; background: var(--card); color: var(--text); box-sizing: border-box; }
.tin { font: inherit; font-size: .88rem; border: 1px solid var(--border); border-radius: 9px; padding: 7px 10px; background: var(--card); color: var(--text); max-width: 320px; }
.steps > .btn-s { align-self: flex-start; }

/* Xac nhan ngay tren trang (thay confirm/alert) */
.ask { border: 1px solid var(--brand); background: var(--cite-bg); border-radius: 10px; padding: 10px 12px; margin-top: 8px; font-size: .88rem; }
.ask p { margin: 0 0 8px; color: var(--text); }
.ask-act { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.say { margin: 6px 0 0; }

/* Dieu kien dung tro ly */
#gateBox { padding: 0 14px; }
.gate-card { border: 1px solid var(--brand); background: var(--cite-bg); border-radius: 12px; padding: 12px 14px; margin: 10px 0; font-size: .88rem; }
.gate-card b { color: var(--navy); }
.gate-card small { color: var(--muted); font-weight: 400; }
.gate-card ul { list-style: none; margin: 8px 0 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.gate-card li { display: flex; align-items: center; gap: 8px; }
.gate-card li > span:nth-child(2) { flex: 1; }
.gate-card .gi { width: 22px; height: 22px; flex: none; border-radius: 50%; display: grid; place-items: center; font-size: .75rem; font-weight: 700; background: var(--card); color: var(--cite-ink); border: 1px solid var(--border); }
.gate-card li.ok { color: var(--muted); }
.gate-card li.ok .gi { background: #1e8e3e; color: #fff; border-color: #1e8e3e; }

/* Nghe bai giang */
.tts-bar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; background: var(--cite-bg); border-radius: 10px; padding: 8px 12px; }
.tts-bar .sel { padding: 3px 6px; }
.lsec.reading { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(35,135,227,.15); }

/* Bang nho: diem danh, ket qua chinh thuc */
table.mini { border-collapse: collapse; font-size: .88rem; }
table.mini th, table.mini td { border: 1px solid var(--border, #e3e8ef); padding: 5px 8px; white-space: nowrap; }
table.mini th { background: var(--soft, #f4f6fa); font-weight: 600; }