:root{--bg:#f6f8fc;--card:#fff;--text:#172033;--muted:#6f7788;--line:#e7eaf0;--primary:#1769ff;--primary-dark:#0d51d9;--danger:#c93232;--shadow:0 18px 50px rgba(24,39,75,.10);--radius:24px}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif}body{min-height:100dvh}button,input{font:inherit}button{-webkit-tap-highlight-color:transparent}.app-shell{width:100%;min-height:100dvh;display:flex;justify-content:center;align-items:stretch}.screen{width:min(100%,520px);min-height:100dvh;padding:max(18px,env(safe-area-inset-top)) 18px max(18px,env(safe-area-inset-bottom));display:flex;flex-direction:column;gap:18px;background:var(--card)}@media(min-width:700px){body{padding:32px 0}.app-shell{min-height:calc(100dvh - 64px);align-items:center}.screen{min-height:760px;max-height:calc(100dvh - 64px);border-radius:32px;box-shadow:var(--shadow);overflow:auto}}.topbar{display:flex;align-items:center;gap:12px}.progress-wrap{flex:1;height:8px;border-radius:999px;background:#edf0f5;overflow:hidden}.progress-bar{height:100%;background:var(--primary);border-radius:inherit;transition:width .25s ease}.step-text{color:var(--muted);font-size:14px;white-space:nowrap}.hero{margin-top:auto;margin-bottom:auto;text-align:center}.hero-icon{width:88px;height:88px;margin:0 auto 22px;border-radius:28px;display:grid;place-items:center;font-size:44px;background:#eef4ff}h1{margin:0 0 12px;font-size:clamp(28px,8vw,38px);line-height:1.07;letter-spacing:-.03em}h2{margin:0 0 10px;font-size:clamp(25px,7vw,32px);line-height:1.12;letter-spacing:-.025em}p{margin:0;line-height:1.5}.muted{color:var(--muted)}.card{border:1px solid var(--line);border-radius:var(--radius);padding:18px;background:#fff}.form{display:grid;gap:16px}.label{display:grid;gap:8px;font-weight:700}.input{width:100%;min-height:58px;border:1.5px solid #d8dde8;border-radius:16px;padding:0 16px;font-size:18px;outline:none}.input:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(23,105,255,.10)}.actions{margin-top:auto;display:grid;gap:10px}.btn{width:100%;min-height:60px;border:0;border-radius:18px;padding:12px 18px;font-size:18px;font-weight:800;cursor:pointer}.btn-primary{color:#fff;background:var(--primary)}.btn-primary:active{background:var(--primary-dark)}.btn-secondary{color:var(--text);background:#eef1f6}.btn-danger{color:var(--danger);background:#fff1f1}.btn:disabled{opacity:.55;cursor:not-allowed}.sound-card{text-align:center;padding:26px 18px}.sound-icon{font-size:64px;margin-bottom:14px}.media-placeholder,.media-frame{width:100%;min-height:280px;border-radius:24px;background:#101827;color:white;overflow:hidden;display:grid;place-items:center;text-align:center;position:relative}.media-placeholder{padding:24px}.media-placeholder .big{font-size:54px;margin-bottom:12px}.media-frame video,.media-frame img{width:100%;max-height:58dvh;object-fit:contain;display:block;background:#101827}.answer-list{display:grid;gap:12px;margin-top:10px}.answer-btn{width:100%;min-height:62px;padding:12px 16px;border:1.5px solid #dfe4ec;background:#fff;color:var(--text);border-radius:18px;text-align:left;font-size:18px;font-weight:700}.answer-btn.selected{border-color:var(--primary);background:#eef4ff;color:#0d51d9}.resume-box{text-align:center;margin:auto 0}.user-code{display:inline-block;margin-top:14px;padding:8px 12px;border-radius:12px;background:#f0f3f8;color:#555f72;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.status-line{min-height:24px;text-align:center;color:var(--muted);font-size:14px}.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);max-width:calc(100vw - 36px);padding:12px 16px;border-radius:14px;background:#172033;color:white;font-size:14px;box-shadow:var(--shadow);z-index:50}.hidden{display:none!important}