@import url("https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;600;700;800;900&display=swap");
:root{--bg:#f4f1ff;--ink:#1e1b4b;--mut:#6b7280;--card:#fff;--line:#e5e7eb;--pri:#6d28d9;--pri2:#8b5cf6;--ok:#16a34a;--bad:#dc2626;--warn:#f59e0b;--sh:0 6px 20px rgba(76,29,149,.14);--r:16px}
*{box-sizing:border-box}html,body{margin:0;height:100%}
body{font-family:"Be Vietnam Pro","Segoe UI",system-ui,sans-serif;background:var(--bg);color:var(--ink);font-size:16px;-webkit-tap-highlight-color:transparent}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3{margin:0}a{color:var(--pri)}
.hide{display:none!important}.row{display:flex;gap:10px;align-items:center}.col{display:flex;flex-direction:column;gap:10px}.grow{flex:1;min-width:0}.wrap{flex-wrap:wrap}.sp{flex:1}.c{text-align:center}.mut{color:var(--mut)}.sm{font-size:.85rem}.b{font-weight:800}
.card{background:var(--card);border-radius:var(--r);box-shadow:var(--sh);padding:16px}
.btn{border:0;border-radius:12px;padding:10px 16px;font-weight:800;cursor:pointer;background:var(--pri);color:#fff;transition:.12s;display:inline-flex;gap:6px;align-items:center;justify-content:center;white-space:nowrap}
.btn:hover{filter:brightness(1.08);transform:translateY(-1px)}.btn:active{transform:none}.btn:disabled{opacity:.45;cursor:not-allowed;transform:none;filter:none}
.btn.sec{background:#ede9fe;color:var(--pri)}.btn.ok{background:var(--ok)}.btn.bad{background:var(--bad)}.btn.warn{background:var(--warn);color:#422006}.btn.gh{background:transparent;color:var(--pri);border:2px solid #ddd6fe}.btn.sm{padding:6px 10px;font-size:.85rem;border-radius:9px}.btn.lg{padding:14px 22px;font-size:1.15rem;border-radius:14px}
input[type=text],input[type=password],input[type=number],input[type=search],select,textarea{width:100%;border:2px solid #ddd6fe;border-radius:12px;padding:10px 12px;background:#fff;outline:0}
input:focus,select:focus,textarea:focus{border-color:var(--pri2);box-shadow:0 0 0 3px #ddd6fe}textarea{resize:vertical;min-height:80px}
label.f{display:flex;flex-direction:column;gap:4px;font-weight:700;font-size:.9rem}label.f>span.h{font-weight:500;color:var(--mut);font-size:.8rem}
.chip{display:inline-flex;align-items:center;gap:6px;border-radius:99px;padding:3px 12px;background:#ede9fe;color:var(--pri);font-weight:800;font-size:.85rem}
.chip.ok{background:#dcfce7;color:#15803d}.chip.bad{background:#fee2e2;color:#b91c1c}.chip.warn{background:#fef3c7;color:#92400e}
.tabs{display:flex;gap:6px;flex-wrap:wrap}.tab{border:0;background:#fff;border-radius:99px;padding:8px 16px;font-weight:800;cursor:pointer;color:var(--pri);box-shadow:0 2px 6px rgba(0,0,0,.06)}.tab.on{background:var(--pri);color:#fff}
.modalbg{position:fixed;inset:0;background:rgba(30,27,75,.62);z-index:900;display:flex;align-items:flex-start;justify-content:center;padding:4vh 12px;overflow:auto}
.modal{background:#fff;border-radius:20px;max-width:980px;width:100%;box-shadow:0 20px 60px rgba(0,0,0,.4);padding:20px;position:relative;animation:pop .2s}.modal.narrow{max-width:520px}.modal>.x{position:absolute;right:12px;top:10px}
.modal h2{margin-bottom:12px}
@keyframes pop{from{transform:scale(.9)}to{transform:none}}
#toasts{position:fixed;left:50%;transform:translateX(-50%);bottom:84px;z-index:999;display:flex;flex-direction:column;gap:8px;align-items:center;pointer-events:none}
.toast{background:var(--ink);color:#fff;padding:10px 18px;border-radius:99px;font-weight:700;box-shadow:var(--sh);animation:pop .2s;max-width:90vw}.toast.ok{background:var(--ok)}.toast.bad{background:var(--bad)}.toast.star{background:linear-gradient(90deg,#f59e0b,#ec4899);font-size:1.15rem}
.katex{font-size:1.05em}.qtxt{line-height:1.5}
/* đồng hồ + bảng vinh danh */
.clock{background:linear-gradient(160deg,#312e81,#6d28d9);color:#fff;border-radius:18px;padding:14px 16px;text-align:center;box-shadow:var(--sh)}
.clock .lb{font-size:.8rem;opacity:.85;font-weight:700}.clock .dg{font-size:3.2rem;font-weight:900;font-variant-numeric:tabular-nums;line-height:1.05;letter-spacing:1px}
.clock .bar{display:block;height:8px;border-radius:99px;background:rgba(255,255,255,.25);margin-top:8px;overflow:hidden}.clock .bar i{display:block;height:100%;background:#fde047;width:calc(var(--p,1)*100%);transition:width .9s linear}
.clock.warn .dg{color:#fecaca;animation:blink 1s infinite}.clock.warn .bar i{background:#f87171}.clock.done{background:linear-gradient(160deg,#334155,#475569)}.clock.mini{padding:6px 12px;border-radius:12px}.clock.mini .dg{font-size:1.6rem}.clock.mini .lb{display:none}.clock.mini .bar{height:4px;margin-top:3px}
@keyframes blink{50%{opacity:.55}}
.honor{background:#fff;border-radius:18px;box-shadow:var(--sh);overflow:hidden}.honor h3{background:linear-gradient(90deg,#f59e0b,#ec4899);color:#fff;padding:10px 14px;font-size:1rem}
.honor .lock{padding:22px 14px;text-align:center;color:var(--mut);font-weight:700}.honor .lock b{display:block;font-size:2rem}
.hrow{display:flex;align-items:center;gap:8px;padding:6px 12px;border-bottom:1px solid #f3f4f6;font-weight:700}.hrow .rk{width:26px;height:26px;border-radius:50%;background:#ede9fe;color:var(--pri);display:grid;place-items:center;font-size:.8rem;flex:none}
.hrow:nth-child(2) .rk{background:#fde047;color:#713f12}.hrow:nth-child(3) .rk{background:#e5e7eb;color:#374151}.hrow:nth-child(4) .rk{background:#fdba74;color:#7c2d12}
.hrow .nm{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.hrow .pt{font-weight:900;color:var(--pri);font-variant-numeric:tabular-nums}.hrow .tmdot{width:10px;height:10px;border-radius:50%;flex:none}
.honor .scroll{max-height:46vh;overflow:auto}
/* tiến độ học sinh */
.ptiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(168px,1fr));gap:10px}
.ptile{background:#fff;border-radius:14px;padding:9px 11px;box-shadow:0 3px 10px rgba(76,29,149,.1);border-left:6px solid var(--tc,#c4b5fd);position:relative}.ptile.off{opacity:.5}.ptile.done{background:#f0fdf4}
.ptile .nm{font-weight:800;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;display:flex;gap:6px;align-items:center}.ptile .nm i{width:8px;height:8px;border-radius:50%;background:#22c55e;flex:none}.ptile.off .nm i{background:#9ca3af}
.pbar{height:8px;border-radius:99px;background:#e5e7eb;overflow:hidden;margin:6px 0 4px}.pbar b{display:block;height:100%;background:linear-gradient(90deg,#8b5cf6,#ec4899);width:calc(var(--p,0)*100%);transition:width .5s}
.dots{display:flex;gap:2px;flex-wrap:wrap}.dots span{width:9px;height:9px;border-radius:50%;background:#e5e7eb}.dots span.k{background:#22c55e}.dots span.x{background:#ef4444}
.ptile .meta{font-size:.78rem;color:var(--mut);display:flex;justify-content:space-between}
/* sân khấu */
.stagebox{position:relative;border-radius:22px;overflow:hidden;background:#0f172a;box-shadow:var(--sh);aspect-ratio:16/9;width:100%}
.stagebox>svg,.stagebox>.html{position:absolute;inset:0;width:100%;height:100%}
.stagebox .html{overflow:hidden;font-size:calc(var(--u,1)*1px)}
.tbadge{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:99px;color:#fff;font-weight:900;box-shadow:0 3px 8px rgba(0,0,0,.25)}
.stagebar{position:absolute;left:12px;right:12px;top:10px;display:flex;gap:8px;align-items:center;justify-content:space-between;pointer-events:none;z-index:2}
.stagetitle{background:rgba(15,23,42,.72);color:#fff;border-radius:99px;padding:6px 16px;font-weight:900}
.waitstage{display:grid;place-items:center;height:100%;color:#fff;text-align:center;background:radial-gradient(circle at 50% 30%,#4c1d95,#1e1b4b)}
.waitstage .big{font-size:clamp(3rem,10vw,7rem)}.waitstage h2{font-size:clamp(1.2rem,3vw,2.4rem);margin:6px 0}
@keyframes floaty{50%{transform:translateY(-10px)}}.floaty{animation:floaty 2.4s ease-in-out infinite}
@keyframes shake{20%{transform:translateX(-8px) rotate(-2deg)}40%{transform:translateX(8px) rotate(2deg)}60%{transform:translateX(-5px)}80%{transform:translateX(5px)}}
canvas.confetti{position:fixed;inset:0;pointer-events:none;z-index:1200;width:100%;height:100%}
/* nút cộng điểm nổi */
#bonusfab{position:fixed;right:16px;bottom:16px;z-index:800;border:0;border-radius:99px;padding:14px 20px;font-weight:900;font-size:1.05rem;color:#fff;background:linear-gradient(90deg,#f59e0b,#ec4899);box-shadow:0 8px 24px rgba(236,72,153,.5);cursor:pointer}
#bonusfab:hover{transform:scale(1.05)}
.nmgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px;max-height:46vh;overflow:auto;padding:2px}
.nmbtn{border:2px solid #ddd6fe;background:#fff;border-radius:12px;padding:8px;cursor:pointer;font-weight:800;text-align:left;display:flex;gap:6px;align-items:center}.nmbtn.on{background:#ede9fe;border-color:var(--pri)}.nmbtn .tmdot{width:10px;height:10px;border-radius:50%}
/* trang chủ / đăng nhập */
.hero{min-height:100vh;display:grid;place-items:center;padding:20px;background:radial-gradient(circle at 20% 10%,#c4b5fd 0,transparent 40%),radial-gradient(circle at 90% 90%,#fbcfe8 0,transparent 40%),var(--bg)}
.hero .card{width:100%;max-width:420px}.logo{font-size:2.2rem;font-weight:900;background:linear-gradient(90deg,#6d28d9,#ec4899);-webkit-background-clip:text;background-clip:text;color:transparent;text-align:center}
.codein{font-size:2rem;text-align:center;letter-spacing:8px;font-weight:900}