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UI",system-ui,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overscroll-behavior:none}.scrollbar-hide{-ms-overflow-style:none;scrollbar-width:none}.scrollbar-hide::-webkit-scrollbar{display:none}.gradient-text{background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.app-card{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius-lg);padding:var(--sp-4);transition:background .2s,border-color .2s}.app-card:hover{background:var(--card-hover)}.app-card-interactive{cursor:pointer}.app-card-interactive:active{transform:scale(.98)}.app-card-interactive:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.btn-primary{background:var(--gradient);color:#fff;border-radius:var(--radius-md);padding:14px 24px;font-weight:700;font-size:15px;width:100%;border:none;cursor:pointer;transition:transform .15s,box-shadow .15s;box-shadow:0 4px 16px var(--accent-shadow);font-family:inherit}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 20px var(--accent-shadow)}.btn-primary:active{transform:translateY(0);box-shadow:0 2px 8px var(--accent-shadow)}.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}.btn-primary:focus-visible{outline:2px solid var(--accent-light);outline-offset:3px}.btn-outline{border:2px solid var(--accent);color:var(--accent);border-radius:var(--radius-md);padding:14px 24px;font-weight:700;font-size:15px;background:transparent;cursor:pointer;transition:background .15s;font-family:inherit}.btn-outline:hover{background:var(--accent-bg)}.btn-outline:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.btn-ghost{border:none;background:none;color:var(--text2);cursor:pointer;font-family:inherit;transition:color .15s}.btn-ghost:hover{color:var(--text)}.btn-ghost:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}.chat-bubble{max-width:82%;padding:12px 16px;border-radius:18px;font-size:14px;line-height:1.6;word-break:break-word}.chat-user{background:var(--gradient);color:#fff;border-bottom-right-radius:4px;margin-left:auto}.chat-ai{background:var(--card);border:1px solid var(--card-border);border-bottom-left-radius:4px;color:var(--text)}.nav-item{display:flex;flex-direction:column;align-items:center;gap:2px;padding:8px 4px;border-radius:var(--radius-sm);transition:color .15s;flex:1;background:none;border:none;cursor:pointer;font-family:inherit;min-height:44px;justify-content:center}.nav-item.active{color:var(--accent)}.nav-item:not(.active){color:var(--text2)}.nav-item:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}@keyframes fadeIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInFast{0%{opacity:0}to{opacity:1}}@keyframes pop{0%{transform:scale(.85);opacity:0}55%{transform:scale(1.04)}to{transform:scale(1);opacity:1}}@keyframes shake{0%,to{transform:translateX(0)}25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}@keyframes slideUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@keyframes slideIn{0%{opacity:0;transform:translateX(16px)}to{opacity:1;transform:translateX(0)}}@keyframes flashGreen{0%{background:rgba(34,197,94,.22)}to{background:transparent}}@keyframes flashRed{0%{background:rgba(239,68,68,.22)}to{background:transparent}}@keyframes dotBounce{0%,60%,to{transform:translateY(0)}30%{transform:translateY(-6px)}}@keyframes pulse-accent{0%,to{opacity:1}50%{opacity:.5}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@media (prefers-reduced-motion:reduce){*,:after,:before{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}.skeleton{background:linear-gradient(90deg,var(--card) 25%,var(--card-border) 50%,var(--card) 75%);background-size:200% 100%;animation:shimmer 1.5s infinite;border-radius:var(--radius-md)}.animate-fade-in{animation:fadeIn .3s ease both}.animate-pop{animation:pop .35s ease both}.animate-shake{animation:shake .35s ease}.animate-slide-up{animation:slideUp .35s ease both}.animate-slide-in{animation:slideIn .25s ease both}.animate-flash-green{animation:flashGreen .55s ease}.animate-flash-red{animation:flashRed .55s ease}.quiz-option{padding:14px 18px;background:var(--card);border:2px solid var(--card-border);border-radius:var(--radius-md);font-size:15px;font-weight:600;text-align:left;color:var(--text);transition:border-color .15s,background .15s;width:100%;cursor:pointer;font-family:inherit}.quiz-option:hover:not(:disabled){border-color:var(--accent);background:var(--accent-bg)}.quiz-option:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.quiz-option.correct{background:rgba(34,197,94,.14);border-color:var(--green)}.quiz-option.wrong{background:rgba(239,68,68,.14);border-color:var(--red)}.quiz-option:disabled{cursor:default}.word-chip{display:inline-flex;align-items:center;padding:8px 14px;border-radius:var(--radius-sm);font-size:14px;font-weight:700;cursor:pointer;transition:transform .12s,border-color .12s;-moz-user-select:none;user-select:none;-webkit-user-select:none}.word-chip:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.word-chip-available{background:var(--accent-bg);color:var(--accent);border:2px solid transparent}.word-chip-available:hover{border-color:var(--accent);transform:scale(1.04)}.word-chip-placed{background:var(--card);color:var(--text);border:2px solid var(--card-border)}.word-chip-placed:hover{border-color:var(--red)}.progress-bar-track{height:6px;background:var(--card-border);border-radius:3px;overflow:hidden}.progress-bar-fill{height:100%;background:var(--gradient);border-radius:3px;transition:width .5s ease}.badge{display:inline-flex;align-items:center;gap:4px;padding:3px 10px;border-radius:20px;font-size:11px;font-weight:700}.badge-accent{background:var(--accent-bg);color:var(--accent)}.badge-green{background:rgba(34,197,94,.14);color:var(--green)}.badge-blue{background:rgba(59,130,246,.14);color:var(--blue)}.app-input{width:100%;padding:12px 16px;background:var(--card);border:1.5px solid var(--card-border);border-radius:var(--radius-md);color:var(--text);font-size:14px;font-family:inherit;outline:none;transition:border-color .15s}.app-input:focus{border-color:var(--accent)}.app-input:focus-visible{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-bg)}.app-input::-moz-placeholder{color:var(--text2)}.app-input::placeholder{color:var(--text2)}.lesson-header{position:sticky;top:0;z-index:10;background:var(--bg);padding:16px 0;display:flex;align-items:center;gap:12px}.app-container{max-width:480px;margin:0 auto;position:relative;min-height:100vh;overflow-x:hidden;padding-bottom:env(safe-area-inset-bottom,0)}