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32px}.app-header{position:sticky;top:12px;z-index:10;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px;margin-bottom:28px;border:1px solid rgba(255,255,255,.72);border-radius:999px;background:#ffffffb8;box-shadow:0 12px 30px #603f1014;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}.brand-button,.app-header nav button{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:999px;color:var(--ink);background:transparent}.brand-button{padding:10px 16px;font-weight:900;font-size:1.05rem}.app-header nav{display:flex;gap:8px}.account-area{display:flex;align-items:center;justify-content:flex-end;gap:8px;flex-wrap:wrap}.account-name,.sync-pill{display:inline-flex;align-items:center;min-height:32px;padding:6px 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26px;font-size:1.08rem}.small{min-height:36px;padding:8px 12px;font-size:.88rem}.train-illustration{position:relative;display:grid;place-items:center;min-height:250px;border-radius:36px;background:radial-gradient(circle at 50% 30%,rgba(255,255,255,.9),transparent 36%),linear-gradient(145deg,#d9f6ff,#fff1bd)}.engine{filter:drop-shadow(0 20px 15px rgba(0,0,0,.15));font-size:clamp(5rem,16vw,9rem);animation:float 2.4s ease-in-out infinite}.rail{position:absolute;bottom:38px;color:#5a42236b;font-weight:900}.smoke{position:absolute;font-size:2.1rem;opacity:.75}.smoke-one{top:44px;left:24%}.smoke-two{top:70px;right:26%}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.stats-grid,.feature-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;margin:22px 0}.feature-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.stat-card,.feature-card,.panel{padding:24px}.stat-card span,.stat-card small{display:block}.stat-card 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#ffd36b}.answer-panel label{margin-bottom:12px;color:#1f2933;font-size:1.35rem;font-weight:900}.input-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px}.input-row input{width:100%;min-height:60px;padding:0 18px;border:3px solid #ffd36b;border-radius:20px;outline:none;color:#1f2933;background:#fffdf5;font-size:1.45rem;font-weight:800}.input-row input:focus{border-color:var(--primary);box-shadow:0 0 0 5px #ff7a1a24}.feedback{min-height:44px;margin:16px 0 4px;padding:14px 16px;border-radius:18px;font-weight:900}.feedback.idle{color:#52606d;background:#f4f7fb}.feedback.success{color:#14532d;background:#dcfce7}.feedback.error{color:#9f1239;background:#ffe4e6}.tiny-note{margin:8px 0 0;color:#7c8794;font-size:.9rem}.result-page{max-width:800px;margin:40px auto;text-align:center}.result-page h1{font-size:clamp(2.2rem,6vw,4.6rem)}.result-stars{margin:18px 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small{color:currentColor;font-size:.82rem;font-weight:900;opacity:.82}.theme-monster .character-stage,.theme-garden .character-stage,.theme-space .character-stage,.theme-train .character-stage{background:linear-gradient(160deg,var(--theme-soft),rgba(255,255,255,.92))}.theme-monster .big-character,.theme-garden .big-character,.theme-space .big-character,.theme-train .big-character{text-shadow:0 12px 24px rgba(38,50,56,.08)}.theme-monster .listen-button,.theme-garden .listen-button,.theme-space .listen-button,.theme-train .listen-button{color:var(--theme-ink);border-color:var(--theme-b)}.theme-monster .summary-character,.theme-garden .summary-character,.theme-space .summary-character,.theme-train .summary-character{background:var(--theme-soft)}.theme-monster .mistake-character,.theme-garden .mistake-character,.theme-space .mistake-character,.theme-train .mistake-character{background:linear-gradient(135deg,var(--theme-a),var(--theme-b))}@media (max-width: 900px){.hero-card,.practice-card{grid-template-columns:1fr}.stats-grid,.feature-grid,.style-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.level-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.admin-mistake-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.mistake-card{grid-template-columns:90px minmax(0,1fr)}.mistake-actions{grid-column:1 / -1;justify-content:flex-start}}@media (max-width: 640px){.app-shell{width:min(100% - 20px,1180px);padding-top:10px}.app-header{align-items:stretch;flex-direction:column;border-radius:24px}.app-header nav{display:grid;grid-template-columns:repeat(3,1fr)}.account-area{justify-content:stretch}.account-area>*{flex:1 1 auto;justify-content:center}.login-panel{grid-template-columns:1fr;margin-top:-12px}.app-header nav 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