:root{--bg:#0f1117;--surface:#1a1d27;--surface2:#242836;--border:#2e3345;--text:#e4e6ed;--text-dim:#8b8fa3;--accent:#58cc02;--accent-dim:#2b6601;--wrong:#ff4b4b;--wrong-dim:#661e1e;--warn:#ffc800;--phase-review:#1cb0f6;--phase-learn:#ce82ff;--phase-use:#ff9600;--xp:#ffc800;--streak:#ff9600}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);min-height:100dvh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,system-ui,sans-serif;overflow:hidden}#root{flex-direction:column;min-height:100dvh;display:flex}.app{flex-direction:column;flex:1;max-height:100dvh;display:flex;overflow:hidden}.topbar{background:var(--surface);border-bottom:1px solid var(--border);align-items:center;gap:16px;padding:12px 24px;display:flex}.stat{align-items:center;gap:6px;font-size:14px;font-weight:700;display:flex}.stat-icon{font-size:18px}.stat-xp{color:var(--xp)}.stat-streak{color:var(--streak)}.stat-accuracy{color:var(--accent)}.progress-wrap{background:var(--surface);padding:0 24px}.progress-bar{background:var(--surface2);border-radius:5px;height:10px;margin-bottom:4px;overflow:hidden}.phase-label{letter-spacing:.06em;padding-bottom:10px;font-size:12px;font-weight:700}.phase-review .progress-fill{background:var(--phase-review)}.phase-review .phase-label{color:var(--phase-review)}.phase-learn .progress-fill{background:var(--phase-learn)}.phase-learn .phase-label{color:var(--phase-learn)}.phase-use .progress-fill{background:var(--phase-use)}.phase-use .phase-label{color:var(--phase-use)}.exercise-area{flex-direction:column;flex:1;justify-content:center;align-items:center;padding:40px 24px;display:flex;overflow-y:auto}@keyframes 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