/* CO-CHU-0311 */
/* Giáo trình tự học RQX */
.ls-body { background: #F3F6FC; }
.ls-head { background: radial-gradient(900px 300px at 85% -30%, rgba(96, 165, 250, .35), transparent), linear-gradient(160deg, var(--navy), var(--blue)); color: #fff; padding: 34px 0 40px; }
.kid .ls-head { background: radial-gradient(900px 300px at 85% -30%, rgba(147, 197, 253, .55), transparent), linear-gradient(160deg, #0E7490, #2563EB); }
.ls-head h1 { color: #fff; font-size: clamp(24px, 3.78vw, 35.5px); margin: 6px 0 4px; }
.ls-head h1 .zh { color: var(--gold2); margin-right: 8px; }
.ls-head .meta { color: #D6E2FF; }
.ls-nav { position: sticky; top: 64px; z-index: 30; background: #fff; border-bottom: 1px solid var(--line); }
.ls-nav .wrap { display: flex; gap: 4px; overflow-x: auto; padding-top: 6px; padding-bottom: 6px; }
.ls-nav a { white-space: nowrap; padding: 8px 12px; border-radius: 10px; font-weight: 700; font-size: 14px; color: #475569; }
.ls-nav a:hover { background: var(--sky); color: var(--navy); }
.ls-main { padding: 24px 0 80px; }
.blk { background: #fff; border-radius: 18px; box-shadow: var(--shadow); padding: 24px; margin-bottom: 22px; scroll-margin-top: 130px; }
.blk > h2 { font-size: 21px; display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.goals { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.goals li { padding-left: 30px; position: relative; } .goals li::before { content: "🎯"; position: absolute; left: 0; }
.words { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.word { border: 1.5px solid var(--line); border-radius: 14px; padding: 14px; position: relative; background: #FBFCFE; }
.word .hz { font-family: var(--zh); font-size: 25.5px; font-weight: 700; color: var(--navy); line-height: 1.2; }
.word .py { color: var(--blue2); font-weight: 700; }
.word .vi { font-weight: 600; } .word .ty { font-size: 12.5px; color: var(--muted); }
.word .ex { margin-top: 8px; font-size: 14px; border-top: 1px dashed var(--line); padding-top: 8px; }
.word .ex .z { font-family: var(--zh); font-size: 16px; }
.snd { border: 0; background: var(--sky); color: var(--blue); width: 34px; height: 34px; border-radius: 50%; cursor: pointer; font-size: 15px; flex: 0 0 auto; }
.snd:hover { background: var(--blue); color: #fff; }
.word .snd { position: absolute; top: 12px; right: 12px; }
.tools { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.tools label { font-size: 14px; display: flex; align-items: center; gap: 4px; background: #F1F5F9; padding: 6px 10px; border-radius: 999px; cursor: pointer; }
.text h3 { font-size: 18px; margin: 4px 0 2px; } .text .scene { color: var(--muted); font-size: 14px; margin-bottom: 10px; }
.line { display: flex; gap: 10px; align-items: flex-start; padding: 8px 0; }
.line .av { flex: 0 0 auto; width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; font-family: var(--zh); color: #fff; font-weight: 700; font-size: 15px; }
.line .bub { flex: 1; background: #F8FAFC; border-radius: 4px 14px 14px 14px; padding: 8px 12px; }
.line.r { flex-direction: row-reverse; } .line.r .bub { background: #EEF3FF; border-radius: 14px 4px 14px 14px; }
.line .nm { font-size: 12.5px; color: var(--muted); font-weight: 700; }
.line .z { font-family: var(--zh); font-size: 19px; line-height: 1.7; }
.line .p { color: var(--blue2); font-size: 14px; } .line .v { color: #475569; font-size: 14px; }
.line.playing .bub { box-shadow: 0 0 0 2px var(--gold); }
.reading .line .bub { background: #FFFDF5; border-radius: 12px; }
.nopy .p, .nopy .py-x { display: none; } .novi .v { display: none; }
.gram { border-left: 4px solid var(--blue2); padding: 2px 0 2px 16px; margin-bottom: 22px; }
.gram h3 { font-size: 18px; } .formula { display: inline-block; background: var(--navy); color: var(--gold2); font-family: var(--zh); font-weight: 700; padding: 6px 14px; border-radius: 10px; margin: 6px 0 10px; font-size: 17.5px; }
.exs { margin: 8px 0; } .exs div { padding: 4px 0; } .exs .z { font-family: var(--zh); font-size: 18px; }
.warn { background: #F1F7FF; border: 1px solid #CDE1FE; border-radius: 10px; padding: 8px 12px; font-size: 14px; color: #124D9F; margin-top: 8px; }
.hanzi { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; }
.hanzi .c { border-radius: 14px; padding: 14px; background: linear-gradient(160deg, #FFF8E7, #fff); border: 1px solid #F6E3B4; }
.hanzi .ch { font-family: "KaiTi", "STKaiti", var(--zh); font-size: 46px; line-height: 1; color: var(--red); }
.culture { background: linear-gradient(135deg, #FFF7E0, #FFFDF5); border: 1px solid #F8E3A3; }
.qz { border-bottom: 1px dashed var(--line); padding: 16px 0; }
.qz:last-child { border-bottom: 0; }
.qz .qt { font-weight: 700; margin-bottom: 8px; } .qz .qt .n { display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 8px; background: var(--navy); color: #fff; font-size: 13px; margin-right: 6px; }
.qz .qzh { font-family: var(--zh); font-size: 19px; margin-bottom: 8px; }
.ch-opts { display: flex; flex-wrap: wrap; gap: 8px; }
.ch-opts button, .pairs button, .chips2 button { border: 1.5px solid var(--line); background: #fff; border-radius: 12px; padding: 9px 14px; cursor: pointer; font-size: 16px; font-family: inherit; }
.ch-opts button.zh, .chips2 button { font-family: var(--zh); font-size: 18px; }
.ch-opts button.right, .pairs button.right { border-color: var(--green); background: #E9F9EF; }
.ch-opts button.wrong, .pairs button.wrong { border-color: var(--red); background: #ECF3FD; }
.pairs { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; max-width: 520px; }
.pairs button.sel { border-color: var(--blue2); background: #EEF3FF; }
.pairs button.done { opacity: .45; cursor: default; }
.chips2 { display: flex; flex-wrap: wrap; gap: 8px; margin: 6px 0; } .chips2 button.used { opacity: .3; }
.built2 { min-height: 44px; border: 2px dashed #C7D5F5; border-radius: 12px; padding: 8px 12px; font-family: var(--zh); font-size: 19px; margin: 6px 0; }
.fb { margin-top: 8px; font-size: 14px; border-radius: 10px; padding: 8px 12px; }
.fb.ok { background: #DBEAFE; color: #1E40AF; } .fb.no { background: #E2EEFE; color: #1B4F99; }
.tr-in { width: 100%; max-width: 520px; padding: 10px 12px; border: 1.5px solid var(--line); border-radius: 10px; font-size: 18px; font-family: var(--zh); }
.score { position: sticky; bottom: 12px; z-index: 20; background: var(--navy); color: #fff; border-radius: 14px; padding: 12px 18px; display: flex; gap: 12px; align-items: center; justify-content: space-between; box-shadow: var(--shadow2); margin-top: 16px; }
.pager { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.kid .blk > h2 { color: #0E7490; }
.kid .word { background: #F0FDFF; border-color: #BAE6FD; }
.w-links { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 8px; padding-top: 7px; border-top: 1px dashed var(--line); }
.w-links a, .w-links button { font-size: 12.5px; font-weight: 700; padding: 3px 9px; border-radius: 999px; border: 1px solid #C7D5F5; background: #EEF4FF; color: var(--navy); cursor: pointer; font-family: inherit; text-decoration: none; display: inline-flex; align-items: center; gap: 4px; }
.w-links a:hover, .w-links button:hover { background: var(--blue); color: #fff; border-color: var(--blue); }
.w-links .w-app { background: #FFF7E0; border-color: #F6E3B4; color: #1E40AF; }
.w-links .w-app:hover { background: var(--gold); color: var(--navy); border-color: var(--gold); }
.hw-box { background: linear-gradient(135deg, #EEF4FF, #FFFDF5); border: 2px solid #C7D5F5; border-radius: 16px; padding: 18px 20px; margin-top: 14px; }
.hw-chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0 14px; }
.hw-chips a { font-size: 13px; font-weight: 700; padding: 4px 10px; border-radius: 999px; background: #fff; border: 1px solid #CBD5E1; color: var(--navy); text-decoration: none; }
.hw-chips a:hover { border-color: var(--blue); color: var(--blue); background: #F8FAFC; }
.slide-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 12px; margin-top: 12px; }
.slide-card { border: 1.5px solid var(--line); border-radius: 14px; padding: 14px; background: #FAFCFF; display: flex; flex-direction: column; gap: 6px; }
.tzg-box { width: 176px; height: 176px; margin: 6px auto; border: 2px solid #105DC8; border-radius: 10px; position: relative; background: #FFFDF9; display: grid; place-items: center; overflow: hidden; }
.tzg-box::before { content: ""; position: absolute; inset: 0; background:
  linear-gradient(to right, transparent 49.5%, rgba(16, 93, 200, .22) 49.5%, rgba(16, 93, 200, .22) 50.5%, transparent 50.5%),
  linear-gradient(to bottom, transparent 49.5%, rgba(16, 93, 200, .22) 49.5%, rgba(16, 93, 200, .22) 50.5%, transparent 50.5%),
  linear-gradient(45deg, transparent 49.5%, rgba(16, 93, 200, .12) 49.5%, rgba(16, 93, 200, .12) 50.5%, transparent 50.5%),
  linear-gradient(-45deg, transparent 49.5%, rgba(16, 93, 200, .12) 49.5%, rgba(16, 93, 200, .12) 50.5%, transparent 50.5%);
  pointer-events: none; }

/* nhóm Tiếng Trung cho người đi làm (WORK): Mẫu câu của bài, Tài liệu ngành liên quan */
.sents { list-style: none; margin: 10px 0 0; padding: 0; display: grid; gap: 8px; counter-reset: sc; }
.sent { display: flex; gap: 10px; align-items: flex-start; border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; background: #fff; counter-increment: sc; }
.sent::before { content: counter(sc); flex: 0 0 26px; height: 26px; border-radius: 50%; background: #F1F5F9; color: var(--navy); font-size: 13.5px; font-weight: 700; display: flex; align-items: center; justify-content: center; margin-top: 4px; }
.sent .sb { min-width: 0; flex: 1; }
.sent .z { font-family: "Noto Serif SC", serif; font-size: 19px; line-height: 1.5; overflow-wrap: anywhere; }
.sent .z b { color: var(--red); }
.sent .p { color: var(--blue2); font-size: 14.5px; overflow-wrap: anywhere; }
.sent .v { font-size: 15.5px; color: var(--ink2); }
.sent.playing { box-shadow: 0 0 0 2px var(--gold); }
.s-nopy .sent .p { display: none; } .s-novi .sent .v { display: none; }
.rel-docs { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); }
.rel-doc { display: flex; gap: 10px; align-items: flex-start; flex-wrap: wrap; border: 1px solid var(--line); border-radius: 12px; padding: 12px; background: #F8FAFC; }
.rel-doc .ic { font-size: 26px; line-height: 1; }
.rel-doc .tx { flex: 1; min-width: 180px; display: flex; flex-direction: column; gap: 2px; font-size: 15.5px; }
.rel-doc .bt { display: flex; gap: 6px; flex-wrap: wrap; width: 100%; }

/* Trang bài gọn theo 3 bước Học - Luyện - Kiểm tra + Tiến độ (nang-cap-khoa-hoc 3.2, 28/10/2026) */
.ls-nav .wrap { align-items: center; gap: 6px; }
.ls-nav a[data-grp] { display: inline-flex; align-items: center; gap: 6px; padding: 9px 14px; font-size: 15px; color: #334155; border: 1.5px solid transparent; }
.ls-nav a[data-grp] .ic { font-size: 17px; }
.ls-nav a[data-grp].on { background: var(--navy); color: #fff; }
.ls-nav .ls-pct { background: #E8F8EE; color: #12733A; border-radius: 999px; padding: 1px 8px; font-size: 13.5px; }
.ls-nav a.on .ls-pct { background: #12A150; color: #fff; }
.ls-nav .ls-where { margin-left: auto; white-space: nowrap; font-size: 14px; font-weight: 600; color: #475569; padding-left: 8px; }
.ls-bar { height: 3px; background: #E6EBF5; }
.ls-bar i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, #12A150, #4ADE80); transition: width .4s; }
.grp-sec { scroll-margin-top: 120px; margin-bottom: 34px; }
.grp-h { margin: 6px 0 14px; padding: 0 4px; }
.grp-h h2 { display: flex; align-items: center; gap: 10px; font-size: 24px; color: var(--navy); margin: 0 0 4px; }
.grp-no { display: inline-grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; background: var(--navy); color: #fff; font-size: 17px; font-weight: 800; flex: none; }
#nhom-luyen .grp-no { background: #0957C3; } #nhom-kiem-tra .grp-no { background: #105DC8; }
.grp-h p { margin: 0 0 8px; color: #475569; font-size: 15.5px; }
.grp-links { display: flex; flex-wrap: wrap; gap: 6px; }
.grp-links a { background: #fff; border: 1px solid var(--line); border-radius: 999px; padding: 5px 11px; font-size: 14px; font-weight: 600; color: #334155; }
.grp-links a:hover { background: var(--sky); color: var(--navy); }
.grp-links a small { color: #64748B; font-weight: 700; }
.hoc-them { padding: 0; overflow: hidden; }
.hoc-them > summary { cursor: pointer; list-style: none; padding: 18px 24px; display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px; }
.hoc-them > summary::-webkit-details-marker { display: none; }
.hoc-them > summary::after { content: "▾"; margin-left: auto; color: #64748B; }
.hoc-them[open] > summary::after { content: "▴"; }
.hoc-them .hm-t { font-size: 19px; font-weight: 800; color: var(--navy); }
.hoc-them .hm-d { font-size: 14.5px; }
.hoc-them > .blk { box-shadow: none; border-top: 1px solid var(--line); border-radius: 0; margin: 0; }
.ky { border: 1.5px solid var(--line); border-radius: 14px; padding: 14px 16px; margin-bottom: 14px; background: #FBFCFE; scroll-margin-top: 120px; }
.ky > h3 { margin: 0 0 4px; font-size: 18px; color: var(--navy); }
.ky > h3 small { font-size: 14px; color: #64748B; font-weight: 600; }
.ky-hint { margin: 0 0 8px; font-size: 14px; }
.ky-tools { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
#tien-do { scroll-margin-top: 120px; }
.pg-top { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.pg-num { width: 96px; height: 96px; border-radius: 50%; background: #E8F8EE; border: 4px solid #12A150; display: grid; place-content: center; text-align: center; flex: none; }
.pg-num b { font-size: 26px; color: #12733A; line-height: 1; } .pg-num small { font-size: 12.5px; color: #475569; }
.pg-info { flex: 1; min-width: 220px; }
.pg-tb { height: 10px; border-radius: 6px; background: #E6EBF5; overflow: hidden; } .pg-tb i { display: block; height: 100%; background: linear-gradient(90deg, #12A150, #4ADE80); }
.pg-now { margin-top: 8px; font-size: 15.5px; }
.pg-act { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.pg-buoi { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); gap: 12px; margin-top: 16px; }
.pg-b { border: 1.5px solid var(--line); border-radius: 12px; padding: 10px 12px; background: #FBFCFE; }
.pg-b.cur { border-color: #60A5FA; box-shadow: 0 0 0 2px rgba(96, 165, 250, .25); } .pg-b.ok { border-color: #12A150; background: #F2FBF5; }
.pg-b .bh { display: flex; justify-content: space-between; gap: 8px; flex-wrap: wrap; font-size: 15.5px; }
.pg-b ul { margin: 6px 0; padding-left: 18px; font-size: 14.5px; }
.pg-b .bf { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center; }
.pg-b label.tk { display: inline-flex; gap: 6px; align-items: center; font-size: 14.5px; font-weight: 600; cursor: pointer; }
.pg-b label.tk input { width: 18px; height: 18px; accent-color: #12A150; }
.pg-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 16px; }
.pg-g { border-radius: 12px; background: #F4F7FF; padding: 10px 12px; }
.pg-g ul { list-style: none; margin: 6px 0 0; padding: 0; font-size: 15px; }
.pg-g li { margin: 4px 0; } .pg-g li a { color: #334155; } .pg-g li.ok a { color: #12733A; font-weight: 700; } .pg-g li.half a { color: #1E40AF; }
.pg-note { font-size: 13.5px; margin: 12px 0 0; }
.lt-qs { margin-top: 10px; border: 1px solid #E2E8F0; border-radius: 10px; padding: 8px 12px; background: #FBFCFE; }
.lt-qs summary { cursor: pointer; font-weight: 700; font-size: 14.5px; color: #0B1B3F; }
.lt-qs ol { margin: 10px 0 4px; padding-left: 22px; display: grid; gap: 10px; font-size: 14.5px; }
.lt-q-item { line-height: 1.45; }
.lt-q-row { display: flex; align-items: center; justify-content: space-between; gap: 6px 10px; flex-wrap: wrap; cursor: pointer; }
.lt-q-txt { font-weight: 600; color: #0F172A; }
.lt-qa-btn { border: 1px solid #BFD6FB; background: #EFF6FF; color: #0B6CF3; font-weight: 700; font-size: 12.5px; padding: 3px 10px; border-radius: 999px; cursor: pointer; font-family: inherit; white-space: nowrap; transition: background .15s, color .15s, border-color .15s; }
.lt-qa-btn:hover { background: #DBEAFE; border-color: #93C5FD; }
.lt-qa-btn.is-open { background: #F1F5F9; border-color: #CBD5E1; color: #475569; }
.lt-qa-ans { margin-top: 6px; padding: 7px 11px; border-radius: 8px; background: #F0F7FF; border-left: 3px solid #0B6CF3; color: #1E293B; font-size: 14px; }
.lt-qa-ans[hidden] { display: none !important; }
@media (max-width: 760px) {
  .ls-nav .wrap { gap: 2px; padding: 4px 6px 2px; flex-wrap: wrap; }
  .ls-nav a[data-grp] { flex: 1 1 auto; justify-content: center; gap: 4px; padding: 7px 3px; font-size: 14px; min-width: 0; }
  .ls-nav a[data-grp] .ic { display: none; }
  .ls-nav .ls-pct { font-size: 12.5px; padding: 0 5px; }
  .ls-nav .ls-where { flex: 1 0 100%; margin: 0; padding: 0 0 2px; text-align: center; font-size: 12.5px; line-height: 1.3; }
  .ls-nav .ls-where:empty { display: none; }
  .grp-h h2 { font-size: 21px; }
  .pg-steps { grid-template-columns: 1fr; }
  .pg-num { width: 78px; height: 78px; } .pg-num b { font-size: 21px; }
  .hoc-them > summary { padding: 14px 16px; }
  .ky { padding: 12px; }
}