:root{--xanh:#1F6FB2;--xanh-d:#14558A;--xanh-n:#E6F0FA;--vang:#F5B73B;--ok:#1E8E5A;--ok-n:#E3F5EC;--sai:#C8423B;--sai-n:#FBE9E7;
--nen:#F4F7FB;--the:#fff;--chu:#17212B;--chu2:#5A6775;--vien:#D9E1EA;--bong:0 2px 10px rgba(20,40,70,.08);--bk:14px}
@media (prefers-color-scheme:dark){:root{--xanh:#5AA6E6;--xanh-d:#3F8ACB;--xanh-n:#16293B;--ok:#4CC08A;--ok-n:#12301F;--sai:#F07A72;--sai-n:#3A1B19;--nen:#0F151C;--the:#18212B;--chu:#E8EEF4;--chu2:#9AA8B7;--vien:#2A3643;--bong:0 2px 10px rgba(0,0,0,.4)}}
*{box-sizing:border-box}html,body{margin:0}body{font-family:"Be Vietnam Pro",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--nen);color:var(--chu);line-height:1.5;font-size:16px;-webkit-text-size-adjust:100%}
#app{min-height:100vh;display:flex;flex-direction:column}
.dang-tai{margin:auto;color:var(--chu2);display:flex;gap:10px;align-items:center}.xoay{width:18px;height:18px;border:3px solid var(--vien);border-top-color:var(--xanh);border-radius:50%;animation:q 1s linear infinite}@keyframes q{to{transform:rotate(360deg)}}
.bo-cuc{width:100%;max-width:760px;margin:0 auto;padding:16px 16px 130px;flex:1}
.thanh-tren{position:sticky;top:0;z-index:5;background:var(--the);border-bottom:1px solid var(--vien);padding:10px 16px;display:flex;align-items:center;gap:12px}
.thanh-tren .ten{font-weight:700;color:var(--xanh);flex:1;font-size:15px;line-height:1.2}.thanh-tren .ten small{display:block;font-weight:500;color:var(--chu2);font-size:12px}
.chip{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;background:var(--xanh-n);font-weight:600;font-size:14px;white-space:nowrap}
.the{background:var(--the);border:1px solid var(--vien);border-radius:var(--bk);padding:16px;margin:0 0 14px;box-shadow:var(--bong)}
.the.nhan{border-color:var(--xanh);background:var(--xanh-n)}
h1{font-size:22px;margin:4px 0 8px}h2{font-size:18px;margin:18px 0 8px}h3{font-size:16px;margin:0 0 6px}p{margin:6px 0}.mo{color:var(--chu2);font-size:14px}
.nut{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:12px;padding:12px 18px;font:inherit;font-weight:600;background:var(--xanh);color:#fff;cursor:pointer;text-decoration:none;min-height:46px}
.nut:hover{background:var(--xanh-d)}.nut.phu{background:var(--the);color:var(--xanh);border:1.5px solid var(--xanh)}.nut.xam{background:var(--vien);color:var(--chu)}.nut.to{width:100%}.nut:disabled{opacity:.5;cursor:default}.nut.nho{padding:6px 12px;min-height:34px;font-size:14px}
.thanh{height:10px;background:var(--vien);border-radius:999px;overflow:hidden}.thanh>i{display:block;height:100%;background:linear-gradient(90deg,var(--xanh),#38B2AC);border-radius:999px;transition:width .4s}
.thanh.lon{height:14px}
label{display:block;font-weight:600;margin:12px 0 4px}input[type=text],input[type=password],input[type=search],select,textarea{width:100%;font:inherit;padding:11px 12px;border:1.5px solid var(--vien);border-radius:10px;background:var(--the);color:var(--chu)}
textarea{min-height:90px;resize:vertical}input:focus,select:focus,textarea:focus{outline:2px solid var(--xanh);border-color:var(--xanh)}
.luoi{display:grid;gap:10px}.luoi.hai{grid-template-columns:1fr 1fr}
.dap-an{display:block;width:100%;text-align:left;padding:13px 14px;border:1.5px solid var(--vien);border-radius:12px;background:var(--the);color:var(--chu);font:inherit;cursor:pointer;margin:0 0 9px}
.dap-an:hover:not(:disabled){border-color:var(--xanh);background:var(--xanh-n)}.dap-an.dung{border-color:var(--ok);background:var(--ok-n)}.dap-an.sai{border-color:var(--sai);background:var(--sai-n)}
.tu-lon{font-size:30px;font-weight:700;margin:6px 0;color:var(--xanh)}.ipa{font-family:"Segoe UI","Noto Sans",system-ui,sans-serif;color:var(--chu2);font-size:18px}
.cau-lon{font-size:21px;font-weight:600;line-height:1.4}
.phan-hoi{border-radius:var(--bk);padding:14px;margin-top:12px}.phan-hoi.dung{background:var(--ok-n);border:1.5px solid var(--ok)}.phan-hoi.sai{background:var(--sai-n);border:1.5px solid var(--sai)}.phan-hoi.trung{background:var(--xanh-n);border:1.5px solid var(--xanh)}
.hang{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.hang.giua{justify-content:space-between}.co{flex:1;min-width:0}
.cd{display:flex;gap:12px;align-items:center;text-decoration:none;color:inherit}.cd .so{width:42px;height:42px;border-radius:12px;background:var(--xanh-n);color:var(--xanh);display:flex;align-items:center;justify-content:center;font-weight:700;flex:none}
.cd.xong .so{background:var(--ok-n);color:var(--ok)}.nhan-nho{font-size:12px;padding:2px 8px;border-radius:999px;background:var(--xanh-n);color:var(--xanh);font-weight:600}.nhan-nho.vang{background:#FFF1D0;color:#8A5A00}
.ma-tran{display:flex;flex-wrap:wrap;gap:8px}.ma-tran .o{flex:1 1 120px;text-align:center;padding:10px;border-radius:12px;background:var(--xanh-n)}.ma-tran .o b{display:block;font-size:22px;color:var(--xanh)}
.token{display:inline-block;padding:8px 12px;margin:4px;border:1.5px solid var(--vien);border-radius:10px;background:var(--the);cursor:pointer;font:inherit;color:var(--chu)}.token.dung{opacity:.35}
.o-ghep{min-height:56px;border:2px dashed var(--vien);border-radius:12px;padding:6px;margin:10px 0}
.mic{width:84px;height:84px;border-radius:50%;font-size:34px;border:0;background:var(--xanh);color:#fff;cursor:pointer;box-shadow:var(--bong)}.mic.ghi{background:var(--sai);animation:nhip 1s infinite}@keyframes nhip{50%{transform:scale(1.08)}}
.huy-hieu{display:flex;flex-wrap:wrap;gap:10px}.hh{width:calc(50% - 5px);padding:12px;border-radius:12px;border:1px solid var(--vien);background:var(--the)}.hh.khoa{opacity:.45;filter:grayscale(1)}.hh b{font-size:26px;display:block}
.bang{width:100%;border-collapse:collapse;font-size:14px}.bang th,.bang td{padding:8px 6px;border-bottom:1px solid var(--vien);text-align:left}.bang th{color:var(--chu2);font-weight:600;font-size:12px}
.hang-xh{display:flex;gap:12px;align-items:center;padding:10px 0;border-bottom:1px solid var(--vien)}.hang-xh .h{width:30px;text-align:center;font-weight:700;color:var(--chu2)}.hang-xh.toi{background:var(--xanh-n);border-radius:10px;padding-left:8px;padding-right:8px}
.toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%);background:var(--chu);color:var(--nen);padding:10px 16px;border-radius:12px;z-index:20;max-width:90%;box-shadow:var(--bong)}
.cho{position:fixed;inset:0;background:rgba(0,0,0,.45);display:flex;align-items:center;justify-content:center;z-index:30;padding:16px}.cho .the{max-width:420px;width:100%;margin:0}
.chat{display:flex;flex-direction:column;gap:8px;margin:8px 0}.bong{padding:10px 12px;border-radius:14px;max-width:88%;white-space:pre-wrap}.bong.toi{align-self:flex-end;background:var(--xanh);color:#fff}.bong.ai{align-self:flex-start;background:var(--the);border:1px solid var(--vien)}
.tab{display:flex;gap:6px;margin-bottom:12px;flex-wrap:wrap}.tab button{padding:7px 12px;border-radius:999px;border:1.5px solid var(--vien);background:var(--the);color:var(--chu);font:inherit;cursor:pointer}.tab button.dang{background:var(--xanh);color:#fff;border-color:var(--xanh)}
.ky-nang{display:grid;grid-template-columns:70px 1fr 44px;gap:8px;align-items:center;margin:6px 0;font-size:14px}
.an{display:none!important}
@media (min-width:700px){.hh{width:calc(33.3% - 7px)}}

/* thanh lộ trình ở cuối màn hình: mỗi cấp một màu nhạt, phần đã học tô màu đậm */
:root{--c1n:#D4F0DE;--c1d:#2E9E5B;--c2n:#D3E6FA;--c2d:#2F7FD0;--c3n:#FBE8BC;--c3d:#D98E04;--c4n:#E4D8F6;--c4d:#7B4FC4}
@media (prefers-color-scheme:dark){:root{--c1n:#1E3B2A;--c1d:#4CC08A;--c2n:#1B3250;--c2d:#5AA6E6;--c3n:#41331A;--c3d:#E8A92B;--c4n:#322A4A;--c4d:#A98AE6}}

.o-mat-khau{position:relative}.o-mat-khau input{padding-right:48px}
.mat-xem{position:absolute;right:4px;top:50%;transform:translateY(-50%);width:42px;height:42px;border:0;background:transparent;font-size:20px;cursor:pointer;border-radius:8px;line-height:1}
.mat-xem:focus-visible{outline:2px solid var(--xanh)}

/* chân trang và hộp giới thiệu */
.chan-trang{text-align:center;margin:28px 0 4px}.phien-ban{background:none;border:0;color:var(--chu2);font-size:13px;cursor:pointer;padding:8px 14px;border-radius:20px;text-decoration:underline dotted}.phien-ban:hover{color:var(--chu)}
.gioi-thieu{text-align:center}.gioi-thieu h2{margin:8px 0 2px;font-size:20px}.gt-logo{width:64px;height:64px;border-radius:16px}
.gt-ver{display:inline-block;background:var(--xanh-n);color:var(--xanh-d);font-size:12px;font-weight:700;padding:3px 12px;border-radius:20px}
.gt-nhom{border-top:1px solid var(--vien);padding:10px 0}.gt-tieu{font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--chu2);margin-bottom:4px}.gt-dong{padding:2px 0}
.gt-bq{font-size:12.5px;color:var(--chu2);margin:10px 0 0}.gt-bq a{color:inherit}

/* linh vật ong + bong bóng lời thoại (kiểu Duolingo) */
.ong-hop{display:flex;align-items:center;gap:12px;margin:12px 0}
.ong{width:92px;height:auto;flex:none;scale:-1 1;filter:drop-shadow(0 3px 4px rgba(0,0,0,.12));animation:ong-bay 3.2s ease-in-out infinite}
.ong-hop.lon .ong{width:132px}
.ong-mung{animation:ong-nhay 1.1s ease-in-out infinite}
.bong-ong{position:relative;flex:1;background:var(--the);border:2px solid var(--vien);border-radius:16px;padding:10px 14px;font-weight:500;line-height:1.5}
.bong-ong::before{content:"";position:absolute;right:-9px;top:50%;width:14px;height:14px;background:var(--the);border-right:2px solid var(--vien);border-top:2px solid var(--vien);transform:translateY(-50%) rotate(45deg)}
@keyframes ong-bay{0%,100%{transform:translateY(0)}50%{transform:translateY(-5px)}}
@keyframes ong-nhay{0%,100%{transform:translateY(0) rotate(-2deg)}50%{transform:translateY(-8px) rotate(2deg)}}
@media (prefers-reduced-motion:reduce){.ong,.ong-mung{animation:none}}
@media (max-width:420px){.ong{width:76px}.ong-hop.lon .ong{width:104px}}

/* logo và banner của trường */
.thanh-tren .logo-tren{width:36px;height:36px;flex:none}
.gt-logo-truong{width:56px;height:56px;margin:2px 0 6px}

/* thanh điều hướng: điện thoại = hàng nút dưới đáy; máy tính bảng/máy tính (từ 900px) = cột bên trái */
.dieu-huong{position:fixed;bottom:0;left:0;right:0;background:var(--the);border-top:1px solid var(--vien);padding-bottom:env(safe-area-inset-bottom);z-index:6}
.dh-hang{display:flex;max-width:560px;margin:0 auto}
.dh-hang a,.nut-dong{flex:1 1 0;min-width:0;text-align:center;padding:8px 4px 8px;color:var(--chu2);text-decoration:none;font-size:12px;font-weight:600;background:none;border:0;font-family:inherit;cursor:pointer}
.dh-hang a b,.nut-dong b{display:block;font-size:20px;line-height:1.2}.dh-hang a.dang{color:var(--xanh)}.nut-dong:hover,.dh-hang a:hover{color:var(--chu)}
/* thanh các cấp: mảnh, không chữ, sát đáy */
.lt-bar{display:flex;gap:6px;padding:0 14px 5px;max-width:560px;margin:0 auto}
.lt-bar a{flex:1;display:block;min-width:0}
.lt-bar .rai{height:4px;border-radius:3px;overflow:hidden;background:var(--n)}
.lt-bar .rai i{display:block;height:100%;background:var(--d);border-radius:3px;transition:width .6s ease,height .6s ease,opacity .6s ease}
@media (min-width:700px){.bo-cuc{max-width:820px;padding:24px 24px 130px}.thanh-tren{padding:12px 24px}.dh-hang a,.nut-dong{font-size:13px;padding:10px 4px}}
@media (min-width:900px){
  body:has(.dieu-huong){padding-left:112px}
  .dieu-huong{top:0;right:auto;width:112px;border-top:0;border-right:1px solid var(--vien);display:flex;flex-direction:column;justify-content:center;padding:0 6px 0 0}
  .dh-hang{flex-direction:column;max-width:none;margin:0;gap:6px;padding:0 8px}
  .dh-hang a,.nut-dong{flex:none;padding:12px 4px;border-radius:12px}.dh-hang a.dang{background:var(--xanh-n)}
  .dh-hang a b,.nut-dong b{font-size:24px}
  .lt-bar{position:absolute;top:0;bottom:0;right:0;width:5px;flex-direction:column;padding:0;margin:0;gap:4px}
  .lt-bar .rai{height:100%;width:100%;border-radius:0}
  .lt-bar .rai i{width:100%!important;height:var(--p);border-radius:0}
  .bo-cuc{max-width:900px;padding:28px 32px 48px}.thanh-tren{padding:12px 32px}
}
@media (min-width:1280px){.bo-cuc{max-width:1000px}}

/* trang quản trị */
.lt-mini{display:flex;gap:3px;min-width:92px}.lt-mini i{flex:1;height:6px;border-radius:3px;background:linear-gradient(90deg,var(--d) var(--p),var(--n) var(--p))}
.qt-cot{display:flex;align-items:center;gap:8px;margin:7px 0}.qt-cot>span:first-child{width:44px;font-size:13px}.qt-cot>.mo{width:52px;text-align:right}
.qt-cot .rai{flex:1;height:10px;border-radius:5px;background:var(--n);overflow:hidden}.qt-cot .rai i{display:block;height:100%;background:var(--d)}
.qt-loc{display:flex;flex-direction:column;gap:8px;margin-top:14px}.qt-loc .hang{gap:8px;flex-wrap:wrap}.qt-loc select{flex:1 1 140px}
.qt-bang tr.bam-duoc{cursor:pointer}.qt-bang tr.bam-duoc:hover{background:var(--xanh-n)}.qt-xuat{margin:14px 0 80px}
.qt-ct{max-height:60vh;overflow-y:auto}.qt-ct h3{margin:14px 0 4px;font-size:15px}
@media print{.dieu-huong,.thanh-tren,.qt-loc,.qt-xuat,.chan-trang,.nut{display:none!important}body{background:#fff}}
/* so sánh giọng */
.so-sanh{margin-top:10px;padding-top:6px;border-top:1px dashed var(--vien)}.song-am{width:100%;height:120px;display:block;margin:10px 0 6px;background:var(--xanh-n);border-radius:10px}
/* bài tập kiểu thân thiện: đầu bài + combo, khung phản hồi dưới đáy, nghe/nói */
.dau-bai{position:sticky;top:0;background:var(--nen);padding:6px 0 10px;z-index:4;margin:-4px 0 6px}
.dau-hang{display:flex;align-items:center;gap:10px}
.dong-bai{border:0;background:none;color:var(--chu2);font-size:24px;line-height:1;cursor:pointer;padding:4px 8px;border-radius:8px}.dong-bai:hover{background:var(--vien)}
.thanh.day{flex:1;height:16px}.thanh.day>i{background:linear-gradient(90deg,#29B6F6,var(--xanh))}
.combo{min-height:20px;text-align:center;font-weight:800;color:var(--xanh);letter-spacing:.6px;font-size:15px}.combo.c2{color:var(--c3d)}.combo.c3{color:#E0501F}
.tieu-bai{text-align:center;margin-top:4px;font-size:12px}
.khung-bai{padding-bottom:40px}.khung-bai.co-phan-hoi{padding-bottom:260px}
.phan-hoi{position:fixed;left:0;right:0;bottom:0;margin:0;border-radius:18px 18px 0 0;padding:16px 16px calc(16px + env(safe-area-inset-bottom));z-index:40;border:0;border-top:2px solid;box-shadow:0 -6px 24px rgba(0,0,0,.14);animation:len .22s ease-out}
.phan-hoi.dung{border-color:var(--ok);color:var(--ok)}.phan-hoi.sai{border-color:var(--sai);color:var(--sai)}.phan-hoi.trung{border-color:var(--xanh);color:var(--xanh)}
@keyframes len{from{transform:translateY(40px);opacity:0}to{transform:none;opacity:1}}@media (prefers-reduced-motion:reduce){.phan-hoi{animation:none}}
.ph-trong{max-width:700px;margin:0 auto}.ph-tieu{display:flex;align-items:center}.ph-tieu b{font-size:20px}
.ph-bieu{width:32px;height:32px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;color:#fff;background:currentColor;margin-right:10px;flex:none;font-size:16px}
.ph-bieu{background:var(--ok)}.phan-hoi.sai .ph-bieu{background:var(--sai)}.phan-hoi.trung .ph-bieu{background:var(--xanh)}
.ph-ct{color:var(--chu);margin:10px 0 12px;max-height:38vh;overflow:auto;font-weight:400}.ph-tiep{width:100%}.phan-hoi.sai .ph-tiep{background:var(--sai)}.phan-hoi.dung .ph-tiep{background:var(--ok)}
.loa-doi{display:inline-flex;border:2px solid var(--vien);border-radius:16px;overflow:hidden;margin:8px 0;background:var(--the)}
.loa-doi button{background:none;border:0;font-size:30px;padding:12px 28px;cursor:pointer;color:var(--xanh)}.loa-doi button+button{border-left:2px solid var(--vien)}.loa-doi button:hover{background:var(--xanh-n)}
.bo-qua{display:block;margin:20px auto 0;background:none;border:0;color:var(--chu2);font:inherit;font-weight:800;letter-spacing:.5px;text-transform:uppercase;font-size:13px;cursor:pointer;padding:10px}.bo-qua:hover{color:var(--chu)}
.chua-dat{margin-top:12px;padding:12px 14px;border-radius:12px;background:var(--c3n);border:1.5px solid var(--c3d);text-align:left}.chua-dat>b{color:var(--c3d);font-size:17px}
.the-kho{display:inline-flex;gap:6px;align-items:center;color:var(--sai);font-weight:800;font-size:13px;letter-spacing:.6px;margin:0 0 8px}
.ba-o{display:flex;gap:10px;margin:16px 0}.ba-o-o{flex:1;border-radius:14px;border:2px solid;overflow:hidden;text-align:center;background:var(--the)}
.ba-o-t{font-size:11px;font-weight:800;padding:4px 2px;letter-spacing:.4px}.ba-o-v{padding:14px 4px;font-weight:800;font-size:19px}
.ba-o-o.vang{border-color:#F5B81C}.vang .ba-o-t{background:#F5B81C;color:#4a3300}.ba-o-o.xanh{border-color:#29B6F6}.xanh .ba-o-t{background:#29B6F6;color:#04324a}.ba-o-o.luc{border-color:#2EC4A6}.luc .ba-o-t{background:#2EC4A6;color:#043d33}

/* thẻ nhanh trên trang chủ */
.hai-the{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:12px 0}.hai-the .the{margin:0}.nhanh{text-decoration:none;color:inherit;display:block}.nhanh:hover{border-color:var(--xanh)}.nhanh-ic{font-size:26px}

/* từ gạch chân chấm: chạm để xem nghĩa + phiên âm */
.tu-gach{all:unset;cursor:pointer;border-bottom:2px dotted var(--xanh);padding-bottom:1px;border-radius:2px}.tu-gach:hover,.tu-gach:focus-visible{background:var(--xanh-n)}
.tu-pop{position:fixed;z-index:60;max-width:min(300px,calc(100vw - 16px));background:var(--the);color:var(--chu);border:2px solid var(--xanh);border-radius:14px;padding:12px 14px;box-shadow:0 10px 30px rgba(0,0,0,.22);font-size:15px;font-weight:400}
.tp-tu{font-size:18px}.tp-ipa{font-size:17px;margin:2px 0 4px}.tp-nghia{font-size:16px;font-weight:600}.tp-loa{border:0;background:var(--xanh-n);color:var(--xanh);border-radius:50%;width:38px;height:38px;font-size:18px;cursor:pointer;flex:none}

/* linh vật ong trong bài tập + khung phản hồi */
.khung-bai{position:relative}.ong-nho{width:58px;height:auto;pointer-events:none;filter:drop-shadow(0 2px 3px rgba(0,0,0,.15))}
.ong-goc{position:absolute;right:0;top:-6px;width:56px;scale:-1 1;animation:ong-bay 3.2s ease-in-out infinite;z-index:0}
.ph-tieu .ph-ong{width:44px;margin:-6px 6px -6px 0;flex:none}
.the-nghia{margin:18px auto;max-width:420px;padding:44px 16px;border:2px solid var(--vien);border-radius:22px;text-align:center;font-size:28px;font-weight:700;background:var(--the);box-shadow:0 6px 0 var(--vien)}
.gach-an{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;min-height:44px;padding:6px 0}.gach-an i{display:inline-block;height:26px;border-bottom:3px solid var(--vien)}
.hien-chu{display:block;margin:0 0 6px auto;background:none;border:0;color:var(--xanh);font-weight:800;letter-spacing:.05em;font-size:15px;cursor:pointer;padding:6px 0}
@media (max-width:420px){.ong-goc{width:44px}}

/* nối cặp, đúng/sai, gõ từ thiếu */
.hai-cot-cap{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:10px}.cot-cap{display:flex;flex-direction:column;gap:10px}
.cap{min-height:52px;padding:10px 12px;border-radius:14px;border:2px solid var(--vien);border-bottom-width:4px;background:var(--the);color:var(--chu);font-size:17px;font-weight:600;cursor:pointer;text-align:center}
.cap.chon{border-color:var(--xanh);background:var(--xanh-n);color:var(--xanh)}.cap.dung{border-color:var(--ok);background:var(--ok-n);color:var(--ok);opacity:.75}.cap.sai{border-color:var(--sai);background:var(--sai-n);animation:rung .35s}
@keyframes rung{25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
.dung-sai{width:120px;height:92px;border-radius:18px;border:2px solid var(--vien);border-bottom-width:5px;background:var(--the);font-size:44px;font-weight:800;cursor:pointer}.ds-dung{color:var(--xanh)}.ds-sai{color:var(--xanh)}.dung-sai:active{transform:translateY(2px)}
.o-thieu{border:0;border-bottom:3px solid var(--xanh);background:transparent;color:var(--chu);font:inherit;text-align:center;outline:none;padding:0 4px}

/* lịch tuần + nhiệm vụ */
.lt-hang{display:flex;justify-content:space-between;gap:4px;margin-top:8px}.lt-ngay{display:flex;flex-direction:column;align-items:center;gap:6px;flex:1;font-weight:800;color:var(--chu2);font-size:13px}.lt-ngay.nay .lt-nhan{color:var(--xanh)}
.lt-cham{width:36px;height:36px;border-radius:50%;background:var(--vien);display:flex;align-items:center;justify-content:center;font-size:18px}.lt-cham.hoc{background:#FFE9C7;box-shadow:0 0 0 2px #F5A623 inset}.lt-cham.khoa{background:var(--xanh-n);box-shadow:0 0 0 2px var(--xanh) inset}.lt-cham.sau{opacity:.45}.lt-ngay.nay .lt-cham:not(.hoc):not(.khoa){box-shadow:0 0 0 2px var(--sai) inset;background:var(--sai-n)}
.nv-dong,.nv-thang{margin-top:12px}.nv-thang{border-top:1px solid var(--vien);padding-top:10px}.nv-ten{font-weight:600;margin-bottom:4px}.nv-dong.xong .nv-ten{color:var(--ok)}
.nv-bar{position:relative;height:22px;border-radius:999px}.nv-bar i{display:block;height:100%;border-radius:999px;background:linear-gradient(#e56bb0,#d6489a)}.nv-bar span{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:800;color:#fff;text-shadow:0 1px 2px rgba(0,0,0,.35)}

/* mic to, bấm một lần là bật */
.mic{width:128px;height:128px;font-size:56px;line-height:1;box-shadow:0 6px 0 var(--xanh-d),var(--bong)}.mic:active{transform:translateY(3px);box-shadow:0 3px 0 var(--xanh-d)}
.mic.ghi{box-shadow:0 0 0 10px rgba(240,90,80,.25),0 0 0 22px rgba(240,90,80,.12);animation:nhip 1s infinite}
.mic-ghi-chu{margin-top:14px}
.them-dv>summary{list-style:none;color:var(--xanh)!important;font-weight:700}.them-dv>summary::-webkit-details-marker{display:none}

.mic.nho{width:76px;height:76px;font-size:34px}.mic.nho.ghi{box-shadow:0 0 0 6px rgba(240,90,80,.25),0 0 0 14px rgba(240,90,80,.12)}
.lan-doc{display:flex;justify-content:center;gap:6px;margin:0}.lan-doc i{width:10px;height:10px;border-radius:50%;background:var(--vien)}.lan-doc i.xong{background:var(--ok)}

/* gọn trang chủ, nút dính đáy, vùng chạm lớn hơn */
details.nv>summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;gap:8px;align-items:center}details.nv>summary::-webkit-details-marker{display:none}details.nv[open]>summary{margin-bottom:4px}
.dinh-duoi{position:sticky;bottom:0;z-index:3;background:var(--nen);padding:6px 0;box-shadow:0 -8px 10px -6px var(--nen)}
input[type=checkbox],input[type=radio]{width:22px;height:22px}
.phien-ban{min-height:40px;padding:8px 12px}
@media (min-width:900px){.dinh-duoi{position:static;box-shadow:none}}

details.muc-gon{margin:10px 0;border:1px solid var(--vien);border-radius:var(--bk);background:var(--the);padding:0 14px}details.muc-gon>summary{cursor:pointer;font-weight:700;padding:14px 0;font-size:17px;list-style:none;display:flex;justify-content:space-between}details.muc-gon>summary::after{content:"▾";color:var(--chu2)}details.muc-gon[open]>summary::after{content:"▴"}details.muc-gon>summary::-webkit-details-marker{display:none}details.muc-gon[open]{padding-bottom:12px}

.song-khung{position:relative}.song-nhan{position:absolute;left:6px;font-size:12px;font-weight:700;color:var(--mo,#64748b);z-index:1}.song-nhan.tren{top:4px}.song-nhan.duoi{top:64px}
.cho .the{max-height:calc(100dvh - 32px);overflow-y:auto;overscroll-behavior:contain}
.cho .the>.hang:last-child{position:sticky;bottom:-16px;margin:14px -16px -16px!important;padding:10px 16px;background:var(--the);border-top:1px solid var(--vien)}
.cho .the>.hang:last-child .nut{flex:1}
.dong-bai{font-size:28px;font-weight:700;color:var(--chu)}
.chip-kn{display:flex;gap:6px;overflow-x:auto;margin:8px 0 2px;padding-bottom:2px;scrollbar-width:none}.chip-kn::-webkit-scrollbar{display:none}
.chip{flex:0 0 auto;border:1.5px solid var(--vien);background:var(--the);color:var(--chu2);border-radius:999px;padding:5px 12px;font:inherit;font-size:14px;font-weight:600;cursor:pointer;white-space:nowrap}
.chip.on{background:var(--xanh);border-color:var(--xanh);color:#fff}
.kn-nhan{display:inline-block;font-size:12px;font-weight:800;letter-spacing:.03em;padding:3px 10px;border-radius:999px;margin:0 0 6px;background:var(--xanh-n);color:var(--xanh-d)}
.kn-nghe{background:#E6F2FF;color:#1B63B5}.kn-noi{background:#FFEDEA;color:#B8402F}.kn-doc{background:#E8F6EC;color:#1F7A45}.kn-viet{background:#FFF3DC;color:#9A6200}

/* ===== Giao diện bài tập kiểu Duolingo ===== */
.bt-tieu{font-size:22px;line-height:1.25;margin:4px 0 12px;font-weight:800;color:var(--chu)}
.nut{border-bottom:4px solid rgba(0,0,0,.22);letter-spacing:.4px}.nut:active:not(:disabled){transform:translateY(2px);border-bottom-width:2px}
.nut.to{text-transform:uppercase;font-weight:800;min-height:52px;font-size:16px}.nut.phu{border-bottom-width:4px}
.nut:disabled{opacity:1;background:var(--vien);color:var(--chu2);border-bottom-color:rgba(0,0,0,.08);cursor:not-allowed}
/* cảnh linh vật + bong bóng thoại */
.canh{display:flex;align-items:flex-end;gap:8px;margin:2px 0 14px}.ong-canh{width:84px;flex:none;align-self:flex-end;animation:ong-bay 3.2s ease-in-out infinite}
.bong-noi{position:relative;flex:1;min-width:0;border:2px solid var(--vien);border-radius:18px;background:var(--the);padding:10px;box-shadow:0 3px 0 var(--vien)}
.bong-noi::before{content:"";position:absolute;left:-9px;bottom:22px;width:14px;height:14px;background:var(--the);border-left:2px solid var(--vien);border-bottom:2px solid var(--vien);transform:rotate(45deg)}
.bn-vi{font-size:19px;font-weight:600;margin:2px 4px 8px}
/* loa + sóng âm */
.loa-doi{display:flex;align-items:center;gap:8px;border:0;background:none;margin:0;overflow:visible}
.loa-doi button{flex:none;width:52px;height:46px;border-radius:14px;border:2px solid var(--vien);border-bottom-width:4px;background:var(--the);font-size:24px;padding:0;color:var(--xanh);line-height:1}
.loa-doi button:first-child{background:var(--xanh);border-color:var(--xanh-d);color:#fff}.loa-doi button+button{border-left:2px solid var(--vien)}
.loa-doi button:active{transform:translateY(2px);border-bottom-width:2px}
.song-bar{flex:1;display:flex;align-items:center;justify-content:space-between;gap:3px;height:40px;min-width:0}
.song-bar i{flex:1;max-width:5px;height:calc(var(--h)*100%);border-radius:3px;background:var(--xanh);opacity:.55}
.song-bar.dang i{opacity:1;animation:song .55s ease-in-out infinite alternate;animation-delay:var(--d)}@keyframes song{from{transform:scaleY(.35)}to{transform:scaleY(1.1)}}
@media (prefers-reduced-motion:reduce){.song-bar.dang i{animation:none}}
/* thẻ nội dung lớn */
.the-noi{margin:6px 0 14px;padding:22px 16px;border:2px solid var(--vien);border-bottom-width:5px;border-radius:20px;background:var(--the);text-align:center}
.the-noi .tu-lon,.the-noi .cau-lon{margin:0}.the-noi .tu-lon{font-size:34px}
/* đáp án */
.dap-an{display:flex;align-items:center;gap:12px;border-width:2px;border-bottom-width:4px;border-radius:16px;padding:12px 14px;font-weight:600;font-size:17px}
.dap-an .so{flex:none;width:30px;height:30px;border-radius:9px;border:2px solid var(--vien);display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:800;color:var(--chu2)}
.dap-an:active:not(:disabled){transform:translateY(2px);border-bottom-width:2px}
.dap-an.dung .so{border-color:var(--ok);color:var(--ok)}.dap-an.sai .so{border-color:var(--sai);color:var(--sai)}
/* nói */
.mic.dai{width:100%;max-width:360px;height:78px;border-radius:20px;font-size:40px;box-shadow:0 5px 0 var(--xanh-d)}.mic.dai:active{transform:translateY(3px);box-shadow:0 2px 0 var(--xanh-d)}
.mic.dai.ghi{box-shadow:0 0 0 6px rgba(240,90,80,.25),0 5px 0 #B93A32}
/* viết */
.o-viet{border:2px solid var(--vien);border-bottom-width:4px;border-radius:16px;background:var(--the);font-size:19px;line-height:36px;padding:8px 14px;min-height:112px;background-image:repeating-linear-gradient(transparent 0 35px,var(--vien) 35px 36px);background-attachment:local}
textarea.o-viet{min-height:112px}input.o-viet{min-height:56px;line-height:1.3;background-image:none}
.o-ghep{border:2px solid var(--vien);border-style:solid;border-radius:16px;min-height:96px;padding:6px 8px;background-image:repeating-linear-gradient(transparent 0 47px,var(--vien) 47px 48px);background-attachment:local}
.token{border-width:2px;border-bottom-width:4px;border-radius:14px;padding:9px 14px;font-weight:600;font-size:17px;margin:5px 4px}.token:active:not(:disabled){transform:translateY(2px);border-bottom-width:2px}.token:disabled{background:var(--vien);color:transparent;border-color:var(--vien)}
.dung-sai{border-radius:20px}
.khung-bai:has(.ong-goc) .bt-tieu{padding-right:62px;min-height:44px}
.canh .ong-canh{position:static;scale:1 1;margin-bottom:-4px}

/* chọn từ nghe thấy */
.the-tu{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin:18px 0 12px}
.chip-tu{border:2px solid var(--vien);border-bottom-width:4px;border-radius:14px;background:var(--the);color:var(--chu);font:inherit;font-weight:700;font-size:19px;padding:11px 20px;cursor:pointer}
.chip-tu:active:not(:disabled){transform:translateY(2px);border-bottom-width:2px}
.chip-tu.chon{border-color:var(--xanh);background:var(--xanh-n);color:var(--xanh-d)}.chip-tu.dung{border-color:var(--ok);background:var(--ok-n);color:var(--ok)}.chip-tu.sai{border-color:var(--sai);background:var(--sai-n);color:var(--sai)}
.am-nut{display:flex;align-items:center;gap:8px;width:100%;color:var(--xanh)}.am-nut .song-bar{height:26px;opacity:1}

/* ===== màn mở rương ===== */
.ruong-man{--rg1:#C97B2A;--rg2:#EBB052;--rg3:#8A4B14;position:fixed;inset:0;z-index:60;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;padding:24px 20px;background:radial-gradient(circle at 50% 38%,#FFE9B8,#F6C46A 55%,#E39A3B);color:#5A3200;text-align:center;overflow:auto}
.ruong-man.hiem{--rg1:#3AA7E8;--rg2:#8AD3FF;--rg3:#1F6FAE;background:radial-gradient(circle at 50% 38%,#D8F1FF,#6CC3F2 55%,#2E8FD0);color:#08364F}
.rg-tieu{font-size:22px;font-weight:900;letter-spacing:.08em}.rg-chu{font-size:20px;font-weight:800;margin-top:6px}
.rg-san{position:relative;width:min(70vw,280px)}.rg-hop{display:block;width:100%;border:0;background:none;cursor:pointer;padding:0;animation:rg-lac 1.6s ease-in-out infinite}
.rg-svg{width:100%;height:auto;overflow:visible;filter:drop-shadow(0 8px 0 rgba(0,0,0,.12))}
.rg-nap{transform-origin:22px 74px;transition:transform .5s cubic-bezier(.3,1.6,.5,1)}.rg-sang{opacity:0;transition:opacity .4s .2s}
.ruong-man.mo .rg-hop{animation:none}.ruong-man.mo .rg-nap{transform:rotate(-62deg) translateY(-4px)}.ruong-man.mo .rg-sang{opacity:1}
@keyframes rg-lac{0%,100%{transform:rotate(0)}20%{transform:rotate(-4deg)}40%{transform:rotate(4deg)}60%{transform:rotate(-2deg)}80%{transform:rotate(2deg)}}
.rg-lap{position:absolute;left:50%;top:38%;width:0;height:0;pointer-events:none}.rg-lap i{position:absolute;left:-5px;top:-5px;width:10px;height:10px;border-radius:50%;background:#FFD34D;opacity:0;transform:rotate(var(--a)) translateY(0)}
.ruong-man.mo .rg-lap i{animation:rg-bay .9s var(--d) ease-out forwards}@keyframes rg-bay{0%{opacity:1;transform:rotate(var(--a)) translateY(0)}100%{opacity:0;transform:rotate(var(--a)) translateY(-150px)}}
.rg-thuong{font-size:30px;font-weight:900;animation:rg-hien .5s cubic-bezier(.3,1.6,.5,1)}.rg-thuong b{font-size:48px;color:#fff;text-shadow:0 3px 0 rgba(0,0,0,.25)}@keyframes rg-hien{from{transform:scale(.4);opacity:0}to{transform:none;opacity:1}}
.ruong-man .ong-nho{width:64px}.ruong-man .rg-tiep{max-width:360px;background:#fff;color:#5A3200;border-bottom-color:rgba(0,0,0,.25)}
@media (prefers-reduced-motion:reduce){.rg-hop,.ruong-man.mo .rg-lap i{animation:none}}
.rg-san{margin-top:64px}.ruong-man.mo .rg-nap{transform:rotate(-50deg) translateY(-4px)}

.goi-y{margin:8px 0 12px;padding:12px 14px;border:2px solid #F2C46B;border-bottom-width:4px;border-radius:16px;background:#FFF8E6;color:#6B4A00;text-align:center;animation:rg-hien .3s ease-out}
.goi-y .mo{color:#8A6A1F}.goi-chu{min-height:0;font-size:21px;font-weight:800;color:var(--chu);margin:0 0 8px}.goi-chu.hien{padding:8px;background:#fff;border-radius:12px;border:2px dashed #F2C46B}

.nut.dinh-duoi{background:var(--xanh);color:#fff;padding:12px 18px;margin:6px 0;box-shadow:0 -8px 10px -6px var(--nen);border-bottom:4px solid rgba(0,0,0,.22)}
.nut.dinh-duoi:disabled{background:var(--vien);color:var(--chu2);border-bottom-color:rgba(0,0,0,.08)}
.nut.dinh-duoi:hover:not(:disabled){background:var(--xanh-d)}

/* không chọn/sao chép chữ trong bài; ô nhập vẫn dùng bình thường */
body{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;-webkit-tap-highlight-color:transparent}
input,textarea,[contenteditable]{-webkit-user-select:text;user-select:text}
/* khi bàn phím mở: bỏ phần trang trí để ô nhập luôn nhìn thấy */
body.ban-phim .chip-kn,body.ban-phim .tieu-bai,body.ban-phim .kn-nhan,body.ban-phim .ong-canh,body.ban-phim .ong-goc,body.ban-phim .nhan-combo,body.ban-phim .combo,body.ban-phim .bo-qua,body.ban-phim .mic-ghi-chu{display:none!important}
body.ban-phim .dau-bai{margin-bottom:0}body.ban-phim .bt-tieu{font-size:18px;margin:2px 0 6px}body.ban-phim .canh{margin-bottom:8px}
body.ban-phim .o-viet{min-height:84px}body.ban-phim textarea.o-viet{min-height:84px}
body.ban-phim .goi-y{margin:6px 0;padding:8px 10px}body.ban-phim .goi-y .mo{display:none}

.song-khung{display:flex;gap:8px;align-items:stretch;margin:10px 0 6px}.song-khung .song-am{margin:0;flex:1;min-width:0}
.song-cot{display:flex;flex-direction:column;gap:6px;width:84px;flex:none}
.song-nut{flex:1;border:2px solid var(--vien);border-bottom-width:4px;border-radius:12px;background:var(--the);font:inherit;font-weight:800;font-size:14px;cursor:pointer;padding:0 6px}
.song-nut:active{transform:translateY(2px);border-bottom-width:2px}.song-nut.mau{color:var(--xanh-d);border-color:var(--xanh)}.song-nut.toi{color:#9A6200;border-color:#E9A93A}

.qt-lich{display:flex;gap:6px;margin:6px 0}.qt-ngay{flex:1;text-align:center;border:2px solid var(--vien);border-radius:12px;padding:4px 0;background:var(--the)}.qt-ngay small{display:block;color:var(--chu2);font-weight:700}.qt-ngay b{display:block;min-height:22px}
.qt-ngay.hoc{border-color:var(--ok);background:var(--ok-n);color:var(--ok)}.qt-ngay.khoa{border-color:var(--xanh);background:var(--xanh-n)}.qt-ngay.nay{box-shadow:0 0 0 2px var(--xanh)}

.email-dx{display:block;margin-top:2px;font-size:.72em;font-weight:600;text-transform:none;letter-spacing:0;opacity:.8;overflow-wrap:anywhere;word-break:break-all}
.nut{max-width:100%;overflow-wrap:anywhere}

.bang-cai{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:10px 44px 10px 14px;background:#1e5fa8;color:#fff;font-size:.9rem;line-height:1.35;padding-top:calc(10px + env(safe-area-inset-top))}
.bang-cai a{color:#fff;font-weight:800;text-decoration:underline;white-space:nowrap}
.bang-cai button{position:absolute;right:6px;top:6px;border:0;background:transparent;color:#fff;font-size:1.1rem;padding:8px 10px;cursor:pointer}

.ban-moi{position:fixed;left:12px;right:12px;bottom:calc(76px + env(safe-area-inset-bottom));z-index:60;display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:14px;background:var(--xanh);color:#fff;box-shadow:0 6px 20px rgba(0,0,0,.35);font-weight:600}
.ban-moi span{flex:1}.ban-moi .nut{background:#fff;color:var(--xanh);border-color:#fff}.ban-moi>button:last-child{border:0;background:transparent;color:#fff;font-size:1.1rem;padding:6px 8px;cursor:pointer}

/* gọn kiểu Duolingo: chỉ hiện yêu cầu và kết quả */
.chip-tu-dong{flex-wrap:wrap;gap:8px;margin:10px 0 2px;justify-content:center}
.chip-tu-kq{border:2px solid var(--vien);background:transparent;color:inherit;border-radius:12px;padding:6px 12px;font-size:17px;font-weight:700;cursor:pointer}
.chip-tu-kq.ok{background:var(--ok);border-color:var(--ok);color:#fff}.chip-tu-kq.tb{border-color:var(--ok);color:var(--ok)}.chip-tu-kq.sai{border-color:var(--sai);color:var(--sai)}
.ket-qua-dong{margin:8px 0 0;text-align:center;font-weight:700;color:var(--sai)}
.kn-nhan,.the-kho,.tieu-bai{display:none}
.them{margin:8px 0;text-align:left}.them summary{cursor:pointer;color:var(--xanh);font-weight:700}
.dau-bai .tieu-bai,.so-sanh h3{display:none}
.diem-dat{margin:12px 0 0;text-align:center;font-size:22px;font-weight:800}.diem-dat.ok{color:var(--ok)}.diem-dat.sai{color:var(--sai)}

.bang-hoc{max-height:320px;overflow-y:auto;position:relative;border:1px solid var(--vien,#e3e8ef);border-radius:12px;padding:6px;-webkit-overflow-scrolling:touch}
.bang-hoc.luoi4{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}
.bang-hoc.dsach{display:flex;flex-direction:column;gap:6px}
.o-hoc{font:inherit;text-align:left;border:1px solid #e5e7eb;background:#f3f4f6;color:#9ca3af;border-radius:10px;padding:8px 6px;cursor:pointer;min-width:0;overflow-wrap:anywhere}
.o-hoc b{font-weight:600;font-size:13px}.o-hoc .vi{display:block;font-size:12px;margin-top:2px}
.luoi4 .o-hoc{text-align:center}
.o-hoc.da{background:#dcfce7;border-color:#86efac;color:#14532d}
.o-hoc.da.thuoc{background:#bbf7d0;border-color:#22c55e}
.o-hoc.vua{outline:2px solid #f59e0b;background:#fef3c7;color:#78350f}
@media (max-width:360px){.bang-hoc.luoi4{gap:4px}.o-hoc b{font-size:12px}}
#tien-do-lt>summary::-webkit-details-marker{display:none}#tien-do-lt[open]>summary{margin-bottom:4px}