:root{color-scheme:light;--ink:#18212f;--muted:#5d6878;--line:#d9e1ea;--panel:#fff;--canvas:#edf3f7;--green:#1d6f5f;--green-dark:#15584c;--coral:#b64d43;--gold:#aa7a18;--focus:#2b6de0;--shadow:0 18px 60px rgba(31,47,70,0.12)}*{box-sizing:border-box}body{margin:0;min-height:100vh;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:linear-gradient(180deg,rgba(255,255,255,0.88),rgba(237,243,247,0.96)),url("https://images.unsplash.com/photo-1584515933487-779824d29309?auto=format&fit=crop&w=1800&q=80") center/cover fixed}button,input,select{font:inherit}button{border:0;cursor:pointer}button:focus-visible,label:focus-within{outline:3px solid rgba(43,109,224,0.32);outline-offset:3px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.shell{min-height:100vh;display:grid;grid-template-columns:minmax(380px,0.95fr) minmax(420px,1.05fr);gap:24px;padding:24px}.avatar-panel,.practice-panel{background:rgba(255,255,255,0.9);border:1px solid rgba(217,225,234,0.85);box-shadow:var(--shadow);backdrop-filter:blur(10px)}.avatar-panel{display:grid;grid-template-rows:auto minmax(420px,1fr) auto;min-height:calc(100vh - 48px);overflow:hidden}.practice-panel{min-height:calc(100vh - 48px);padding:28px;display:grid;grid-template-rows:auto auto auto auto 1fr;align-content:start;gap:18px}.topbar,.controls-row,.actions{display:flex;align-items:center;justify-content:space-between;gap:16px}.topbar{padding:24px 24px 10px}.avatar-tools{display:grid;gap:8px;min-width:156px}.eyebrow{margin:0 0 4px;color:var(--green);font-size:.78rem;font-weight:800;text-transform:uppercase;letter-spacing:0}h1,h2,p{margin-top:0}h1{margin-bottom:0;font-size:clamp(1.65rem,3vw,3rem);line-height:1.04;letter-spacing:0}h2{margin-bottom:0;font-size:1.55rem;line-height:1.22;letter-spacing:0}.status{min-width:118px;padding:8px 10px;border:1px solid var(--line);background:#f7fafc;color:var(--muted);font-size:.82rem;font-weight:700;text-align:center}.video-tool{min-height:38px;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:0 12px;background:#edf4f7;color:var(--green-dark);font-size:.84rem;font-weight:800}.video-tool svg{width:17px;height:17px}.video-stage{position:relative;min-height:420px;width:100%;background:linear-gradient(180deg,#dfeaf1 0%,#f8fbfd 100%);display:grid;place-items:center;overflow:hidden}.welcome-video{display:block;width:100%;height:100%;min-height:420px;object-fit:cover;background:#dfeaf1}.liveavatar-frame{width:100%;height:100%;min-height:420px;border:0;background:#111923}.liveavatar-frame[hidden]{display:none}.video-missing{position:absolute;inset:28px;display:grid;align-content:center;gap:10px;padding:24px;border:1px dashed #8fa5b6;background:rgba(246,251,249,0.94);color:#233346;text-align:center}.video-missing[hidden]{display:none}.video-missing strong{display:block;color:var(--green-dark);font-size:1.1rem}.video-missing code{font-size:.9rem;overflow-wrap:anywhere}.educator-line{margin:0 24px 24px;padding:18px;min-height:86px;border-left:5px solid var(--green);background:#f6fbf9;color:#233346;font-size:1.05rem;line-height:1.45}.controls-row{color:var(--muted)}.controls-row strong{display:block;margin-top:4px;color:var(--ink);font-size:1.02rem}.mode-toggle{display:flex;gap:8px}.mode-toggle button{width:42px;height:42px;display:grid;place-items:center;background:#edf4f7;color:var(--green-dark)}.mode-toggle svg,.actions svg{width:19px;height:19px}.question-card,.results-panel{border:1px solid var(--line);background:var(--panel);padding:24px}.results-panel{display:grid;gap:18px}.results-panel[hidden]{display:none}.question-card[hidden],.feedback[hidden],.voice-answer[hidden],.actions[hidden]{display:none}.score-hero{display:grid;gap:8px;padding:22px;border:1px solid rgba(29,111,95,0.24);background:#f1faf7}.score-hero span{color:var(--green-dark);font-size:.82rem;font-weight:800;text-transform:uppercase;letter-spacing:0}.score-hero strong{color:var(--green-dark);font-size:clamp(2.2rem,8vw,4.4rem);line-height:.98}.score-hero p{margin:0;color:#24364d;line-height:1.45}.result-summary{display:grid;gap:10px}.result-item{display:grid;gap:8px;padding:14px;border:1px solid var(--line);background:#fbfcfd}.result-item.correct{border-color:rgba(29,111,95,0.55);background:#f2faf7}.result-item.incorrect{border-color:rgba(182,77,67,0.55);background:#fff5f3}.result-item strong{color:var(--ink)}.result-prompt{margin:0;color:#223044;font-weight:700;line-height:1.42}.result-item span{color:var(--muted);font-size:.9rem;line-height:1.4}.result-actions{display:flex;gap:10px;flex-wrap:wrap}.result-actions button{min-height:46px;display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:0 18px;font-weight:800}.result-actions svg{width:19px;height:19px}.question-meta{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}.question-meta span{padding:5px 9px;background:#eef5f4;color:var(--green-dark);font-size:.78rem;font-weight:800}
.options{display:grid;gap:10px;margin-top:22px}.option{display:grid;grid-template-columns:26px 1fr;align-items:start;gap:12px;min-height:58px;padding:14px;border:1px solid var(--line);background:#fbfcfd;color:#223044}.option:hover{border-color:#a9c4cc}.option input{margin-top:2px;accent-color:var(--green)}.option:has(input:disabled){cursor:default}.option.correct{border-color:rgba(29,111,95,0.75);background:#edf8f4}.option.incorrect{border-color:rgba(182,77,67,0.8);background:#fff3f1}.feedback{padding:18px;border:1px solid var(--line);background:#f9fbfc;line-height:1.5}.voice-answer{display:grid;grid-template-columns:52px 1fr;align-items:center;gap:14px;padding:14px;border:1px solid var(--line);background:#f7fafc}.mic-button{width:52px;height:52px;display:grid;place-items:center;background:var(--green);color:#fff}.mic-button[aria-pressed="true"]{background:var(--coral);box-shadow:0 0 0 6px rgba(182,77,67,0.13)}.mic-button:disabled{cursor:not-allowed;opacity:.55}.mic-button svg{width:23px;height:23px}.voice-answer strong{display:block;margin-bottom:3px;color:var(--ink);font-size:.92rem}.voice-answer p{margin:0;color:var(--muted);line-height:1.35}.feedback strong{color:var(--green-dark)}.feedback.is-wrong strong{color:var(--coral)}.actions{justify-content:flex-start}.actions button{min-height:46px;display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:0 18px;font-weight:800}.primary{background:var(--green);color:white}.primary:hover{background:var(--green-dark)}.secondary{background:#edf3f7;color:#24364d}button:disabled{cursor:not-allowed;opacity:.48}.sources{align-self:end;border-top:1px solid var(--line);padding-top:18px;color:var(--muted)}.sources summary{cursor:pointer;color:var(--ink);font-weight:800}.sources ul{margin:12px 0 0;padding-left:20px}.sources li+li{margin-top:8px}.sources a{color:var(--focus)}@media(max-width:960px){.shell{grid-template-columns:1fr;padding:14px}.avatar-panel,.practice-panel{min-height:auto}.avatar-panel{grid-template-rows:auto minmax(360px,52vh) auto}.practice-panel{padding:18px}}@media(max-width:560px){.topbar,.controls-row,.actions{align-items:stretch;flex-direction:column}.mode-toggle,.avatar-tools,.actions button{width:100%}.mode-toggle button{width:50%}.question-card{padding:18px}h2{font-size:1.28rem}}