:root{--ls-bg:#f4fbf6;--ls-surface:#fff;--ls-ink:#18322a;--ls-ink-soft:#4a6359;--ls-brand:#2f9e6a;--ls-brand-ink:#fff;--ls-accent:#ffb703;--ls-sky:#dff3ff;--ls-ok:#1f7a4d;--ls-ok-bg:#e2f6ea;--ls-warn:#8a5a00;--ls-warn-bg:#fff4d6;--ls-line:#cfe3d8;--ls-focus:#1e5eff;--ls-radius:18px;--ls-gap:14px;--ls-target:64px;--ls-text-scale:1;--ls-font:"Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, "Noto Sans", sans-serif;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}[data-contrast=high]{--ls-bg:#fff;--ls-surface:#fff;--ls-ink:#000;--ls-ink-soft:#000;--ls-brand:#00502b;--ls-line:#000;--ls-ok:#00401f;--ls-ok-bg:#fff;--ls-warn:#000;--ls-warn-bg:#fff}*{box-sizing:border-box}html,body{background:var(--ls-bg);color:var(--ls-ink);font-family:var(--ls-font);-webkit-text-size-adjust:100%;margin:0;padding:0;font-size:18px;line-height:1.45}button,input,select{font:inherit}:focus-visible{outline:3px solid var(--ls-focus);outline-offset:3px}.ls-sr-only{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.ls-app{flex-direction:column;min-height:100vh;display:flex}.ls-main{width:100%;max-width:980px;padding:16px 16px calc(24px + env(safe-area-inset-bottom));flex:1;margin:0 auto}.ls-topbar{background:var(--ls-surface);border-bottom:2px solid var(--ls-line);justify-content:space-between;align-items:center;gap:12px;padding:10px 16px;display:flex}.ls-topbar__brand{color:var(--ls-brand);cursor:pointer;background:0 0;border:0;align-items:center;gap:8px;font-size:1.1rem;font-weight:700;text-decoration:none;display:flex}.ls-btn{border-radius:var(--ls-radius);border:2px solid var(--ls-line);background:var(--ls-surface);min-width:52px;min-height:52px;color:var(--ls-ink);cursor:pointer;touch-action:manipulation;justify-content:center;align-items:center;gap:8px;padding:10px 18px;font-weight:600;text-decoration:none;display:inline-flex}.ls-btn:disabled{opacity:.55;cursor:not-allowed}.ls-btn--primary{background:var(--ls-brand);border-color:var(--ls-brand);color:var(--ls-brand-ink)}.ls-btn--audio{background:var(--ls-sky)}.ls-btn--mic{min-height:var(--ls-target);font-size:1.15rem}.ls-btn--danger{color:#b3261e;border-color:#b3261e}.ls-row{gap:var(--ls-gap);flex-wrap:wrap;justify-content:center;display:flex}.ls-activity{align-items:center;gap:var(--ls-gap);text-align:center;background:var(--ls-surface);border:2px solid var(--ls-line);border-radius:24px;flex-direction:column;padding:20px 16px;display:flex}.ls-instruction{margin:0;font-size:1.2rem;font-weight:600}.ls-picture{justify-content:center;align-items:center;line-height:1;display:inline-flex}.ls-picture--large{font-size:clamp(88px,22vw,150px)}.ls-picture--medium{font-size:clamp(54px,13vw,84px)}.ls-picture--small{font-size:40px}.ls-word{margin:0;font-size:2rem;font-weight:700}.ls-meaning{color:var(--ls-ink-soft);margin:0;font-size:1.1rem}.ls-choices{gap:var(--ls-gap);grid-template-columns:repeat(auto-fit,minmax(130px,1fr));width:100%;display:grid}.ls-choices--pair{grid-template-columns:repeat(2,minmax(0,1fr))}.ls-choice{border:3px solid var(--ls-line);background:var(--ls-surface);cursor:pointer;min-height:120px;color:var(--ls-ink);touch-action:manipulation;border-radius:22px;flex-direction:column;justify-content:center;align-items:center;gap:6px;padding:12px;display:flex;position:relative}.ls-choice--correct{border-color:var(--ls-ok);background:var(--ls-ok-bg);border-style:solid}.ls-choice--wrong{border-color:var(--ls-warn);background:var(--ls-warn-bg);border-style:dashed}.ls-choice__mark{font-size:1.3rem;position:absolute;top:8px;right:10px}.ls-option-card{flex-direction:column;gap:8px;display:flex}.ls-option-text{font-size:1.3rem;font-weight:700}.ls-option-number{font-size:1.2rem;font-weight:700}.ls-feedback{background:var(--ls-ok-bg);border-radius:14px;padding:10px 16px;font-size:1.15rem;font-weight:600}.ls-feedback--retry{background:var(--ls-warn-bg)}.ls-feedback--info{background:var(--ls-sky)}.ls-note{color:var(--ls-ink-soft);background:var(--ls-sky);border-radius:12px;margin:0;padding:8px 12px;font-size:.95rem}.ls-error{color:#8c1d18;background:#fde7e6;border-radius:12px;margin:0;padding:10px 14px}.ls-continue{min-width:200px;min-height:var(--ls-target);font-size:1.2rem}.ls-progress{flex-wrap:wrap;justify-content:center;gap:6px;margin:8px 0 14px;display:flex}.ls-progress__dot{border:2px solid var(--ls-brand);background:0 0;border-radius:50%;width:12px;height:12px}.ls-progress__dot.is-done{background:var(--ls-brand)}.ls-progress__dot.is-current{transform:scale(1.3)}.ls-sentence,.ls-sentence-prompt{background:var(--ls-sky);border-radius:14px;width:100%;min-height:56px;padding:10px 14px;font-size:1.4rem;font-weight:600}.ls-placeholder{color:var(--ls-ink-soft)}.ls-tiles{flex-wrap:wrap;justify-content:center;gap:10px;display:flex}.ls-tile{border:2px solid var(--ls-brand);background:var(--ls-surface);min-width:70px;min-height:56px;color:var(--ls-ink);cursor:pointer;border-radius:14px;padding:8px 16px;font-size:1.25rem;font-weight:700}.ls-input{text-align:center;border:2px solid var(--ls-line);border-radius:14px;width:min(100%,360px);min-height:60px;padding:8px 12px;font-size:1.5rem}.ls-type{align-items:center;gap:var(--ls-gap);flex-direction:column;width:100%;display:flex}.ls-listening{font-size:1.2rem;font-weight:600}.ls-story__title{flex-direction:column;margin:0;display:flex}.ls-story__title small{color:var(--ls-ink-soft);font-weight:500}.ls-story__line{flex-direction:column;align-items:center;gap:6px;font-size:1.25rem;display:flex}.ls-clues{flex-direction:column;gap:8px;width:100%;margin:0;padding:0;list-style:none;display:flex}.ls-clue{background:var(--ls-sky);border-radius:14px;padding:10px 12px;font-size:1.2rem}.ls-clue--image{font-size:2.6rem}.ls-home-grid{gap:var(--ls-gap);grid-template-columns:repeat(auto-fit,minmax(150px,1fr));display:grid}.ls-tile-link{border:3px solid var(--ls-line);background:var(--ls-surface);min-height:140px;color:var(--ls-ink);cursor:pointer;border-radius:24px;flex-direction:column;justify-content:center;align-items:center;gap:6px;padding:12px;font-size:1.15rem;font-weight:700;text-decoration:none;display:flex}.ls-tile-link--hero{background:var(--ls-brand);border-color:var(--ls-brand);min-height:160px;color:var(--ls-brand-ink);grid-column:1/-1;font-size:1.5rem}.ls-tile-link__icon{font-size:2.6rem}.ls-footer-cta{justify-content:center;margin-top:24px;display:flex}.ls-download-cta{color:#fff;cursor:pointer;background:#1d3557;border:0;border-radius:20px;flex-direction:column;align-items:center;gap:2px;padding:14px 22px;font-weight:700;text-decoration:none;display:inline-flex}.ls-download-cta small{opacity:.9;font-weight:500}.ls-parent{font-size:calc(1rem * var(--ls-text-scale));flex-direction:column;gap:16px;display:flex}.ls-parent .ls-note{font-size:.95em}.ls-parent .ls-meaning{font-size:1.05em}.ls-parent .ls-feedback{font-size:1.1em}.ls-parent .ls-btn,.ls-parent select,.ls-parent input,.ls-parent textarea,.ls-parent table{font-size:1em}.ls-card{background:var(--ls-surface);border:2px solid var(--ls-line);border-radius:18px;padding:16px}.ls-card h2,.ls-card h3{margin-top:0}.ls-level{align-items:center;gap:6px;font-weight:600;display:inline-flex}.ls-table{border-collapse:collapse;width:100%}.ls-table th,.ls-table td{text-align:left;border-bottom:1px solid var(--ls-line);padding:8px}.ls-pin{flex-direction:column;align-items:center;gap:12px;display:flex}.ls-pin input{letter-spacing:.4em;text-align:center;border:2px solid var(--ls-line);border-radius:14px;width:200px;min-height:56px;font-size:1.6rem}.ls-garden{grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:12px;display:grid}.ls-plant{border:2px solid var(--ls-line);background:var(--ls-surface);cursor:pointer;min-height:120px;color:var(--ls-ink);border-radius:18px;flex-direction:column;align-items:center;gap:4px;padding:10px;display:flex}.ls-plant--thirsty{background:#eef5ff;border-style:dashed;border-color:#3a86ff}.ls-plant__icon{font-size:2.6rem}.ls-bob{animation:2.4s ease-in-out infinite ls-bob}@keyframes ls-bob{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}[data-motion=reduced] *,[data-motion=reduced] :before,[data-motion=reduced] :after{transition:none!important;animation:none!important}@media (prefers-reduced-motion:reduce){*,:before,:after{transition:none!important;animation:none!important}}@media (max-width:480px){html,body{font-size:17px}.ls-choices{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (orientation:landscape) and (max-height:500px){.ls-picture--large{font-size:80px}.ls-activity{padding:12px}}.ls-sound-tiles{flex-wrap:wrap;justify-content:center;gap:10px;display:flex}.ls-sound-tile{border:3px solid var(--ls-brand);background:var(--ls-surface);min-width:72px;min-height:72px;color:var(--ls-ink);cursor:pointer;border-radius:18px;font-size:2rem;font-weight:800}.ls-sound-tile.is-lit{background:var(--ls-brand);color:var(--ls-brand-ink)}.ls-sound-tile:disabled:not(.is-lit){opacity:.6}.ls-grapheme{background:var(--ls-sky);border-radius:8px;padding:0 6px;font-size:1.6rem;font-weight:800}.ls-slots{justify-content:center;gap:6px;display:flex}.ls-slot{border-bottom:4px solid var(--ls-brand);justify-content:center;align-items:center;width:44px;height:52px;font-size:1.8rem;font-weight:800;display:inline-flex}.ls-match-grid{grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:10px;width:100%;display:grid}.ls-match-card{border:3px solid var(--ls-line);background:var(--ls-surface);cursor:pointer;min-height:96px;color:var(--ls-ink);border-radius:18px;font-size:1.3rem;font-weight:700;position:relative}.ls-match-card span[aria-hidden=true]{font-size:2.4rem}.ls-match-card.is-selected{border-color:var(--ls-focus);border-style:double}.ls-match-card.is-matched{border-color:var(--ls-ok);background:var(--ls-ok-bg)}.ls-choices--stack{grid-template-columns:1fr}.ls-option-card--row{flex-direction:row;align-items:stretch}.ls-option-card--row .ls-choice{text-align:left;flex-direction:row;flex:1;justify-content:flex-start;min-height:72px}.ls-order-badge{background:var(--ls-brand);color:var(--ls-brand-ink);border-radius:50%;justify-content:center;align-items:center;width:32px;height:32px;margin-left:auto;font-weight:800;display:inline-flex}.ls-bubbles{text-align:left;flex-direction:column;gap:8px;width:100%;margin:0;padding:0;list-style:none;display:flex}.ls-bubble{background:var(--ls-sky);border-radius:16px;padding:10px 14px}.ls-bubble--current{background:var(--ls-ok-bg);text-align:left;width:100%;font-size:1.15rem}.ls-chant__lines{flex-direction:column;gap:6px;margin:0;padding:0;font-size:1.3rem;list-style:none;display:flex}.ls-chant__lines li{opacity:.55}.ls-chant__lines li.is-current{opacity:1;font-size:1.5rem;font-weight:800}.ls-chant__lines li.is-done{opacity:.8}.ls-chant__action{font-size:1.1rem}.ls-examples{text-align:left;flex-direction:column;gap:8px;margin:0;padding:0;list-style:none;display:flex}.ls-contrast{margin:0}.ls-gap{border-bottom:3px solid var(--ls-brand);min-width:70px;padding:0 6px;font-weight:800;display:inline-block}.ls-example{flex-direction:column;align-items:center;gap:4px;display:flex}.ls-example__en{margin:0;font-size:1.2rem;font-weight:600}.ls-tips{flex-direction:column;gap:10px;margin:12px 0;padding:0;list-style:none;display:flex}.ls-tips li{background:var(--ls-sky);border-radius:14px;padding:10px 14px}.ls-tips p{margin:4px 0 0}.ls-library__tabs{flex-wrap:wrap;justify-content:flex-start}.ls-library__filters{flex-direction:column;gap:8px;margin:12px 0 4px;display:flex}.ls-library__search{text-align:left;width:100%;font-size:1.15rem}.ls-library__chips{flex-wrap:wrap;justify-content:flex-start;gap:6px}.ls-chip{border:2px solid var(--ls-line);background:var(--ls-surface);min-height:48px;color:var(--ls-ink);font:inherit;cursor:pointer;border-radius:999px;padding:6px 14px}.ls-chip.is-on{border-color:var(--ls-brand);background:var(--ls-ok-bg);font-weight:700}.ls-library__list{grid-template-columns:repeat(auto-fill,minmax(min(100%,320px),1fr));gap:10px;margin:8px 0;padding:0;list-style:none;display:grid}.ls-entry{margin:0}.ls-entry__head{align-items:center;gap:10px;display:flex}.ls-entry__emoji{font-size:2.4rem;line-height:1}.ls-entry__main{flex-direction:column;flex:1;min-width:0;display:flex}.ls-entry__en{font-size:1.35rem}.ls-entry__ipa{opacity:.8}.ls-entry__vi{font-size:1.05rem}.ls-entry__meta{flex-wrap:wrap;gap:6px;margin:6px 0;display:flex}.ls-tag{background:var(--ls-sky);border-radius:999px;margin-right:4px;padding:2px 10px;font-size:.95rem;display:inline-block}.ls-entry details>summary{cursor:pointer;align-items:center;gap:6px;min-height:44px;font-weight:600;display:flex}.ls-library .ls-example{text-align:left;flex-direction:row;justify-content:flex-start;align-items:flex-start;margin:6px 0}.ls-library .ls-example__en{font-size:1.1rem}.ls-rule{background:var(--ls-ok-bg);border-radius:10px;padding:8px 12px}.ls-btn--audio{min-width:48px;min-height:48px}.ls-download-box{border:3px solid var(--ls-brand);margin-top:20px}.ls-download-box__head{align-items:center;gap:12px;display:flex}.ls-download-box__icon{font-size:2.6rem}.ls-download-box__perks{grid-template-columns:repeat(auto-fill,minmax(min(100%,220px),1fr));gap:4px;margin:10px 0;padding:0;list-style:none;display:grid}.ls-download-box__actions{flex-wrap:wrap;justify-content:flex-start}.ls-download-box__button{align-items:center;gap:8px;min-height:56px;font-size:1.15rem;text-decoration:none;display:inline-flex}.ls-download-box__meta{word-break:break-word}.ls-topbar__download{border:2px solid var(--ls-brand);min-height:44px;color:var(--ls-ink);border-radius:999px;align-items:center;gap:4px;padding:4px 12px;font-weight:600;text-decoration:none;display:inline-flex}.ls-course__choices{grid-template-columns:repeat(auto-fill,minmax(min(100%,280px),1fr));gap:12px;padding:0;list-style:none;display:grid}.ls-course__choice{flex-direction:column;gap:4px;display:flex}.ls-course__choice .ls-btn{margin-top:auto}.ls-course__bar{width:100%;height:18px;accent-color:var(--ls-brand);margin:10px 0}.ls-course__stats{grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:8px;margin:0;display:grid}.ls-course__stats div{background:var(--ls-sky);border-radius:12px;padding:8px 12px}.ls-course__stats dt{font-size:.9rem}.ls-course__stats dd{margin:0;font-size:1.4rem;font-weight:800}.ls-course__go{flex-direction:column;align-items:center;gap:4px;margin:12px 0;display:flex}.ls-course__result{border:3px solid var(--ls-brand);background:var(--ls-ok-bg)}.ls-course__badges{flex-wrap:wrap;gap:10px;padding:0;list-style:none;display:flex}.ls-course__badge{border:2px dashed var(--ls-line);opacity:.7;text-align:center;border-radius:14px;flex-direction:column;align-items:center;width:96px;padding:8px;font-size:1.8rem;display:flex}.ls-course__badge small{font-size:.8rem}.ls-course__badge.is-earned{border-style:solid;border-color:var(--ls-brand);background:var(--ls-ok-bg);opacity:1}.ls-course__days{grid-template-columns:repeat(auto-fill,minmax(min(100%,200px),1fr));gap:8px;padding:0;list-style:none;display:grid}.ls-course__day button{border:2px solid var(--ls-line);background:var(--ls-surface);width:100%;min-height:96px;color:var(--ls-ink);font:inherit;text-align:left;cursor:pointer;border-radius:14px;flex-direction:column;align-items:flex-start;gap:2px;padding:10px 12px;display:flex}.ls-course__day.is-done button{border-color:var(--ls-brand);background:var(--ls-ok-bg)}.ls-course__day.is-available button{border:3px solid var(--ls-brand)}.ls-course__day.is-locked button{opacity:.55;cursor:not-allowed}.ls-course__day.is-test button{border-style:double;border-width:4px}.ls-course__daynum{font-weight:800}.ls-course__extras{opacity:.85}.ls-course-home{background:linear-gradient(135deg, var(--ls-brand), #0f8a52);flex-direction:column;align-items:center;gap:4px;width:100%;margin-bottom:12px;display:flex}.ls-course-home small{font-size:1rem;font-weight:600}.ls-course-home .ls-course__bar{max-width:360px}.ls-brand-by{opacity:.8;font-size:.75em;font-weight:600}.ls-app-footer{color:var(--ls-ink-soft);text-align:center;border-top:1px solid var(--ls-line);flex-wrap:wrap;justify-content:center;gap:4px 16px;margin-top:24px;padding:16px 16px 24px;font-size:.95rem;display:flex}.ls-update-banner{background:var(--ls-ok-bg);border-bottom:2px solid var(--ls-brand);flex-wrap:wrap;justify-content:center;align-items:center;gap:8px 16px;padding:10px 16px;font-weight:600;display:flex}