@font-face{font-family:Andika;font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/andika-vi-400.woff2)format("woff2");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Andika;font-style:normal;font-weight:700;font-display:swap;src:url(/fonts/andika-vi-700.woff2)format("woff2");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}.pc-theme-vantots [lang=vi],.pc-theme-vantots .vt-card{font-family:Andika,system-ui,sans-serif}.vt-card{max-width:44rem;margin-inline:auto}.vt-h,.vt-learn h1{margin:var(--space-4) 0 var(--space-8);font-size:clamp(1.7rem,1.4vw + 1.3rem,2.3rem);font-weight:700;line-height:1.3}.vt-learn h2{margin:var(--space-24) 0 var(--space-8);font-size:1.25rem;font-weight:700}.vt-note:empty{display:none}.vt-tabs{gap:var(--space-8);margin:var(--space-16) 0;flex-wrap:wrap;display:flex}.vt-tab,.vt-key,.vt-tone{min-width:56px;min-height:56px;padding:var(--space-8) var(--space-16);border:3px solid var(--ff-outline,#2b2b2b);background:var(--ff-paper,#fff);color:var(--ff-ink,inherit);font:inherit;cursor:pointer;border-radius:18px;font-weight:700}.vt-tab{font-size:1.1rem}.vt-tab[aria-selected=true],.vt-key[aria-pressed=true],.vt-tone[aria-pressed=true]{border-color:var(--pc-select);background:var(--pc-select-bg);box-shadow:inset 0 -4px 0 var(--pc-select)}.vt-tab:focus-visible,.vt-key:focus-visible,.vt-tone:focus-visible{outline:4px solid var(--pc-select);outline-offset:2px}.vt-key:disabled{opacity:.35;cursor:default}.vt-stage{align-items:center;gap:var(--space-16);padding:var(--space-8) 0 var(--space-16);flex-direction:column;display:flex}.vt-prompt{text-align:center;margin:0;font-size:1.25rem;font-weight:700;line-height:1.5}.vt-grid{justify-content:center;gap:var(--space-8);flex-wrap:wrap;max-width:36rem;display:flex}.vt-key{min-width:64px;font-size:1.5rem}.vt-key--vowel{font-size:1.7rem}.vt-big{min-width:10rem;padding:var(--space-8) var(--space-24);text-align:center;border:3px dashed var(--pc-select);background:var(--ff-paper,#fff);border-radius:24px;font-size:clamp(2.6rem,9vw,3.6rem);font-weight:700;line-height:1.4}.vt-go{min-height:48px}.vt-tones{gap:var(--space-12);grid-template-columns:repeat(3,minmax(0,1fr));width:min(36rem,100%);display:grid}.vt-tone{align-items:center;gap:var(--space-4);padding:var(--space-12) var(--space-8);flex-direction:column;display:flex}.vt-tone-syl{font-size:clamp(1.9rem,6vw,2.4rem);line-height:1.4}.vt-tone-name{font-size:1rem}.vt-contour{width:64px;height:38px}.vt-contour path{fill:none;stroke:var(--pc-select);stroke-width:3px;stroke-linecap:round;stroke-linejoin:round}.vt-tone--small .vt-tone-syl{font-size:1.8rem}.vt-pic{font-size:clamp(4rem,14vw,6rem);line-height:1}.vt-hear{min-height:48px}.vt-built{min-width:8rem;min-height:4.6rem;padding:0 var(--space-16);border:3px dashed var(--ff-outline,#2b2b2b);border-radius:20px;place-items:center;font-size:2.6rem;font-weight:700;line-height:1.4;display:grid}.vt-built--done{border-style:solid;border-color:var(--pc-select);background:var(--pc-select-bg)}.vt-step{margin:0;font-size:1.1rem;font-weight:700}.vt-step:empty{display:none}.vt-choices{justify-content:center;gap:var(--space-12);flex-wrap:wrap;display:flex}.vt-next{min-height:56px;font-size:1.15rem}.vt-learn{max-width:46rem;margin-inline:auto}.vt-learn p{max-width:66ch}.vt-learn-list{padding-left:var(--space-24);list-style:outside}.vt-learn-list li{margin-bottom:var(--space-8)}.vt-tone-table{border-collapse:collapse;margin:var(--space-8) 0}.vt-tone-table th,.vt-tone-table td{border:2px solid var(--ff-outline,#2b2b2b);padding:var(--space-8) var(--space-12);text-align:left}.vt-tone-table td[lang=vi]{font-size:1.3rem}.vt-back-link{min-height:44px;line-height:44px;display:inline-block}@media (width<=520px){.vt-tones{grid-template-columns:repeat(2,minmax(0,1fr))}}.pc-theme-vantots.pc-immersive{--pc-env-bg:url(/play/vantots/env.webp) center / cover no-repeat, #fbe3ee;--pc-env-bg-dark:url(/play/vantots/env-dark.webp) center / cover no-repeat, #1d0e16;--pc-env-bg-flat:url(/play/vantots/env.webp) center / cover no-repeat, #fbe3ee;--pc-env-bg-flat-dark:url(/play/vantots/env-dark.webp) center / cover no-repeat, #1d0e16}.pc-theme-vantots{--pc-select:#a3175f;--pc-select-bg:color-mix(in srgb, var(--pc-select) 13%, transparent);color:var(--ff-anvil)}@media (prefers-color-scheme:dark){.pc-theme-vantots{--pc-select:#f6a5cf}.pc-theme-vantots .pc-cta-play,.pc-theme-vantots .ff-rungs .ff-rung[aria-current=true],.pc-theme-vantots .pc-bookshelf-chip:hover,.pc-theme-vantots .pc-q-feedback--reveal .pc-q-feedback-icon,.pc-theme-vantots .pc-hero-overlay h1:after{background:#a3175f}}