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#22b39b);border-radius:9px;height:100%;transition:width .35s;display:block;position:relative}.session-bar>i:after{content:"";background:#ffffff59;border-radius:2px;height:4px;position:absolute;top:3px;left:8px;right:8px}.combo{color:var(--gold);text-align:right;min-width:48px;font-size:.95rem;font-weight:900}.session-body{flex:1;padding:10px 0 180px;animation:.28s slidein}@keyframes slidein{0%{opacity:0;transform:translate(18px)}to{opacity:1;transform:none}}.ex-label{letter-spacing:.08em;text-transform:uppercase;color:var(--jade);margin-bottom:6px;font-size:.78rem;font-weight:900}.ex-title{font-family:var(--f-display);margin-bottom:18px;font-size:1.25rem;font-weight:600}.session-foot{z-index:20;border-top:1px solid var(--line);background:var(--card);padding:14px 16px calc(14px + env(safe-area-inset-bottom));position:fixed;bottom:0;left:0;right:0}.session-foot .inner{align-items:center;gap:12px;max-width:760px;margin:0 auto;display:flex}.session-foot.ok{background:var(--ok-soft);border-color:#0000}.session-foot.bad{background:var(--bad-soft);border-color:#0000}.feedback{flex:1;min-width:0}.feedback .f-title{font-family:var(--f-display);font-size:1.1rem;font-weight:700}.ok .f-title{color:var(--ok)}.bad .f-title{color:var(--bad)}.feedback .f-sub{color:var(--ink-2);font-size:.92rem}.feedback .f-answer{font-family:var(--f-vi);font-size:1.05rem;font-weight:600}@media (width<=560px){.session-foot .inner{flex-direction:column;align-items:stretch}.session-foot .btn{width:100%}}.options{gap:10px;display:grid}.options.two{grid-template-columns:1fr 1fr}.opt{border:2px solid var(--line);background:var(--card);width:100%;min-height:56px;box-shadow:0 3px 0 var(--line);cursor:pointer;text-align:left;border-radius:16px;align-items:center;gap:12px;padding:12px 16px;font-size:1.02rem;font-weight:700;transition:border-color .12s,background .12s,transform 80ms;display:flex}.opt:active{box-shadow:0 1px 0 var(--line);transform:translateY(2px)}.opt .key{border:2px solid var(--line);width:26px;height:26px;color:var(--muted);border-radius:8px;flex-shrink:0;place-items:center;font-size:.75rem;display:grid}.opt.sel{border-color:var(--sky);background:color-mix(in srgb, var(--sky) 10%, var(--card));box-shadow:0 3px 0 color-mix(in srgb, var(--sky) 40%, var(--line))}.opt.right{border-color:var(--ok);background:var(--ok-soft);box-shadow:0 3px 0 color-mix(in srgb, var(--ok) 50%, transparent)}.opt.wrong{border-color:var(--bad);background:var(--bad-soft);box-shadow:0 3px 0 color-mix(in srgb, var(--bad) 50%, transparent)}.opt.dim{opacity:.5}.opt .vi{font-size:1.1rem;font-weight:600}@media (hover:none){.opt .key{display:none}}.prompt{align-items:center;gap:16px;margin:6px 0 22px;display:flex}.prompt .big{font-size:clamp(1.6rem,6vw,2.3rem);font-weight:700;line-height:1.2}.prompt .ru-big{font-size:1.35rem;font-weight:800}.speaker{cursor:pointer;background:var(--sky);color:#fff;width:72px;height:72px;box-shadow:0 5px 0 color-mix(in srgb, var(--sky) 60%, #000);border:0;border-radius:22px;flex-shrink:0;place-items:center;transition:transform 80ms;display:grid}.speaker:active{box-shadow:0 2px 0 color-mix(in srgb, var(--sky) 60%, #000);transform:translateY(3px)}.speaker.small{width:48px;height:48px;box-shadow:0 4px 0 color-mix(in srgb, var(--sky) 60%, #000);border-radius:14px}.speaker.slow{background:var(--card);color:var(--sky);border:2px solid var(--line);box-shadow:0 4px 0 var(--line)}.speaker.playing svg{animation:.8s ease-in-out infinite pulse}@keyframes pulse{50%{transform:scale(1.18)}}.say{cursor:pointer;color:var(--sky);vertical-align:middle;background:0 0;border:0;border-radius:8px;place-items:center;padding:4px;display:inline-grid}.say:hover{background:color-mix(in srgb, var(--sky) 12%, transparent)}.say.playing{color:var(--lacquer)}.tc .t-ngang{color:var(--t-ngang)}.tc .t-huyen{color:var(--t-huyen)}.tc .t-sac{color:var(--t-sac)}.tc .t-hoi{color:var(--t-hoi)}.tc .t-nga{color:var(--t-nga)}.tc .t-nang{color:var(--t-nang)}.tone-err{-webkit-text-decoration:underline wavy var(--bad);text-decoration:underline wavy var(--bad);text-underline-offset:4px}.intro-card{text-align:center;padding:28px 20px}.intro-card .big{margin:10px 0 4px;font-size:clamp(2.2rem,9vw,3.2rem);font-weight:700;line-height:1.1}.intro-card .ru{font-size:1.2rem;font-weight:800}.intro-card .lit{color:var(--muted);margin-top:8px;font-size:.92rem}.syll-tones{flex-wrap:wrap;justify-content:center;gap:14px;margin:14px 0 6px;display:flex}.syll-tones .st{flex-direction:column;align-items:center;gap:2px;font-size:.76rem;font-weight:800;display:flex}.new-badge{background:var(--gold-soft);color:color-mix(in srgb, var(--gold) 60%, var(--ink));letter-spacing:.08em;border-radius:999px;padding:3px 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var(--line);background:var(--card);width:100%;min-height:110px;font-family:var(--f-vi);color:var(--ink);border-radius:16px;outline:none;padding:14px 16px;font-size:1.2rem}.vi-input:focus{border-color:var(--sky)}.tone-keys{flex-wrap:wrap;gap:6px;margin-top:8px;display:flex}.tone-keys button{border:1px solid var(--line);background:var(--card);cursor:pointer;font-family:var(--f-vi);border-radius:10px;min-width:40px;padding:6px 10px;font-size:.95rem;font-weight:700}.tone-keys button:active{background:var(--bg-2)}.tone-grid{grid-template-columns:repeat(3,1fr);gap:10px;display:grid}.tone-btn{border:2px solid var(--line);background:var(--card);box-shadow:0 3px 0 var(--line);cursor:pointer;border-radius:16px;flex-direction:column;align-items:center;gap:4px;padding:12px 6px 10px;font-weight:800;display:flex}.tone-btn .tname{font-family:var(--f-vi);font-size:1rem}.tone-btn .thint{color:var(--muted);font-size:.72rem;font-weight:700}.tone-btn.right{border-color:var(--ok);background:var(--ok-soft)}.tone-btn.wrong{border-color:var(--bad);background:var(--bad-soft)}.syll-slots{flex-wrap:wrap;justify-content:center;gap:12px;margin-bottom:20px;display:flex}.slot{border:2px dashed var(--line);text-align:center;min-width:74px;font-family:var(--f-vi);border-radius:14px;padding:10px 12px;font-size:1.4rem;font-weight:700}.slot.active{border-color:var(--sky);border-style:solid}.slot.filled{border-style:solid}.chat{flex-direction:column;gap:10px;display:flex}.bubble-row{align-items:flex-end;gap:10px;display:flex}.bubble-row.me{flex-direction:row-reverse}.avatar{color:#fff;border-radius:50%;flex-shrink:0;place-items:center;width:38px;height:38px;font-size:.9rem;font-weight:900;display:grid}.bubble{background:var(--card);border:1px solid var(--line);max-width:78%;box-shadow:var(--shadow);cursor:pointer;border-radius:18px 18px 18px 6px;padding:10px 14px}.me .bubble{background:var(--jade-soft);border-color:#0000;border-radius:18px 18px 6px}.bubble.active{outline:3px solid color-mix(in srgb, var(--sky) 50%, transparent)}.bubble .who{color:var(--muted);text-transform:uppercase;letter-spacing:.06em;font-size:.72rem;font-weight:900}.bubble .vi{font-size:1.08rem;font-weight:600}.bubble .tr{color:var(--ink-2);margin-top:2px;font-size:.88rem}.bubble.typing{color:var(--muted)}.scene{color:var(--ink-2);margin-bottom:14px;font-style:italic}.grammar-card .pattern{font-family:var(--f-vi);background:var(--jade-soft);color:var(--jade);border-radius:14px;margin:12px 0;padding:12px 16px;font-size:1.1rem;font-weight:700}.grammar-card code,.rich code{font-family:var(--f-vi);background:var(--card-2);border-radius:6px;padding:1px 6px;font-size:.98em;font-weight:700}.ex-list{gap:8px;margin-top:10px;display:grid}.ex-line{background:var(--card-2);border-radius:12px;align-items:center;gap:8px;padding:8px 12px;display:flex}.ex-line .vi{font-weight:600}.ex-line .tr{color:var(--ink-2);font-size:.88rem}.match{grid-template-columns:1fr 1fr;gap:10px;display:grid}.match .opt{text-align:center;justify-content:center;min-height:60px}.match .opt.gone{visibility:hidden}.result{text-align:center;padding:40px 0 120px}.result .big-num{font-family:var(--f-display);font-size:2.2rem;font-weight:700}.result-stats{grid-template-columns:repeat(3,1fr);gap:10px;margin:22px 0;display:grid}.rstat{border:2px solid var(--line);background:var(--card);border-radius:18px;padding:14px 8px}.rstat .n{font-family:var(--f-display);font-size:1.4rem;font-weight:700}.rstat .l{color:var(--muted);text-transform:uppercase;font-size:.76rem;font-weight:800}.toasts{z-index:100;gap:8px;width:min(420px,100% - 24px);display:grid;position:fixed;top:12px;left:50%;transform:translate(-50%)}.toast{background:var(--card);border:1px solid var(--line);box-shadow:var(--shadow-l);cursor:pointer;border-radius:18px;align-items:center;gap:12px;padding:12px 14px;animation:.35s cubic-bezier(.2,1.4,.5,1) drop;display:flex}.toast .ti{font-size:1.8rem}.toast b{display:block}@keyframes drop{0%{opacity:0;transform:translateY(-30px)}}.ach-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:10px;display:grid}.ach{text-align:center;border:2px solid var(--line);background:var(--card);border-radius:18px;padding:14px 10px}.ach .ai{font-size:2rem}.ach.locked{opacity:.4;filter:grayscale()}.ach .at{margin-top:4px;font-size:.9rem;font-weight:800;line-height:1.2}.ach .ad{color:var(--muted);font-size:.75rem}.passport{grid-template-columns:repeat(auto-fill,minmax(118px,1fr));gap:12px;display:grid}.stamp{aspect-ratio:1;border:3px double var(--c);color:var(--c);text-align:center;transform:rotate(var(--rot,-8deg));letter-spacing:.05em;text-transform:uppercase;background:color-mix(in srgb, var(--c) 7%, transparent);border-radius:50%;flex-direction:column;justify-content:center;align-items:center;padding:10px;font-size:.72rem;font-weight:900;display:flex}.stamp .sp{font-family:var(--f-vi);text-transform:none;letter-spacing:0;font-size:.95rem}.stamp.empty{color:var(--muted);border-style:dashed;transform:none;--c:var(--line)!important}.heat{grid-template-rows:repeat(7,13px);grid-auto-columns:13px;grid-auto-flow:column;gap:3px;max-width:100%;padding-bottom:4px;display:grid;overflow-x:auto}.heat i{background:var(--bg-2);border-radius:3px}.heat i.l1{background:color-mix(in srgb, var(--jade) 30%, var(--bg-2))}.heat i.l2{background:color-mix(in srgb, var(--jade) 60%, var(--bg-2))}.heat i.l3{background:var(--jade)}.heat i.fz{background:color-mix(in srgb, var(--gold) 60%, var(--bg-2))}.search{border:2px solid var(--line);background:var(--card);width:100%;color:var(--ink);border-radius:14px;outline:none;padding:12px 16px;font-size:1rem}.search:focus{border-color:var(--sky)}.dict-row{border-bottom:1px solid var(--line);align-items:center;gap:12px;padding:10px 4px;display:flex}.dict-row .vi{font-size:1.08rem;font-weight:600}.dict-row .ru{color:var(--ink-2);font-size:.92rem}.lvl-dot{background:var(--line);border-radius:50%;flex-shrink:0;width:10px;height:10px}.lvl-dot.l1{background:var(--gold)}.lvl-dot.l2{background:var(--jade)}.seg{background:var(--bg-2);border-radius:12px;flex-wrap:wrap;gap:3px;padding:3px;display:inline-flex}.seg button{cursor:pointer;color:var(--ink-2);background:0 0;border:0;border-radius:9px;padding:7px 12px;font-size:.88rem;font-weight:800}.seg button.on{background:var(--card);color:var(--ink);box-shadow:var(--shadow)}.setting{border-bottom:1px solid var(--line);align-items:center;gap:14px;padding:14px 0;display:flex}.setting:last-child{border-bottom:0}.switch{background:var(--line);cursor:pointer;border:0;border-radius:15px;flex-shrink:0;width:50px;height:30px;transition:background .2s;position:relative}.switch:after{content:"";background:#fff;border-radius:50%;width:24px;height:24px;transition:transform .2s;position:absolute;top:3px;left:3px;box-shadow:0 1px 3px #0000004d}.switch.on{background:var(--jade)}.switch.on:after{transform:translate(20px)}.tool{background:var(--card);border:2px solid var(--line);color:var(--ink);box-shadow:0 4px 0 var(--line);cursor:pointer;text-align:left;border-radius:20px;align-items:center;gap:14px;width:100%;padding:16px;text-decoration:none;display:flex}.tool .ti{border-radius:16px;flex-shrink:0;place-items:center;width:54px;height:54px;font-size:1.7rem;display:grid}.tool b{font-size:1.02rem;display:block}.rich p{margin:0 0 .7em}.rich strong{color:var(--ink)}.tone-legend{flex-wrap:wrap;gap:8px;display:flex}.tone-legend span{font-family:var(--f-vi);align-items:center;gap:4px;font-size:.9rem;font-weight:700;display:inline-flex}.record-btn{background:var(--lacquer);color:#fff;cursor:pointer;width:96px;height:96px;box-shadow:0 6px 0 var(--lacquer-2);border:0;border-radius:50%;place-items:center;margin:0 auto;display:grid}.record-btn.rec{animation:1s ease-in-out infinite recpulse}@keyframes recpulse{50%{box-shadow:0 6px 0 var(--lacquer-2), 0 0 0 14px color-mix(in srgb, var(--lacquer) 25%, transparent)}}.heard{font-family:var(--f-vi);font-size:1.2rem;font-weight:600}.hit{color:var(--ok)}.miss{color:var(--bad);-webkit-text-decoration:underline dotted;text-decoration:underline dotted}.onboard{place-items:center;min-height:100dvh;padding:24px 16px;display:grid}.onboard .card{width:min(520px,100%)}.choice{gap:10px;display:grid}.fade-in{animation:.4s fade}@keyframes fade{0%{opacity:0;transform:translateY(6px)}}.confetti{pointer-events:none;z-index:90;position:fixed;inset:0}.divider{background:var(--line);height:1px;margin:18px 0}.kbd-hint{color:var(--muted);font-size:.75rem}@media (hover:none){.kbd-hint{display:none}}