:root{--primary: #4f46e5;--primary-hover: #4338ca;--secondary: #f1f5f9;--accent: #ec4899;--bg: #f8fafc;--card-bg: #ffffff;--text-main: #1e293b;--text-sub: #64748b;--border: #e2e8f0;--shadow: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--radius: 1.5rem}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Outfit,Inter,system-ui,sans-serif;background-color:var(--bg);color:var(--text-main);min-height:100vh;display:flex;justify-content:center;align-items:center;padding:1rem}#root{width:100%;max-width:420px}.app-container{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);padding:2rem;min-height:500px;display:flex;flex-direction:column;position:relative;overflow:hidden}.settings-container{display:flex;flex-direction:column;gap:1.5rem;height:100%}h2{font-size:1.5rem;font-weight:700;color:var(--text-main);margin-bottom:.5rem;text-align:center}.setting-group{display:flex;flex-direction:column;gap:.75rem}.setting-group label{font-size:.9rem;font-weight:600;color:var(--text-sub)}.range-inputs{display:flex;align-items:center;gap:.5rem}input[type=number]{width:100%;padding:.75rem;border:2px solid var(--border);border-radius:.75rem;font-size:1.1rem;text-align:center;font-weight:600;outline:none;transition:border-color .2s}input[type=number]:focus{border-color:var(--primary)}.control-row{display:flex;align-items:center;justify-content:space-between;background:var(--secondary);padding:.5rem;border-radius:1rem}.btn-circle{width:40px;height:40px;border:none;background:#fff;border-radius:50%;font-size:1.25rem;color:var(--primary);cursor:pointer;box-shadow:0 2px 4px #0000000d;display:flex;align-items:center;justify-content:center;transition:transform .1s}.btn-circle:active{transform:scale(.95)}.value-display{font-size:1.1rem;font-weight:700;color:var(--text-main)}.mode-toggle{display:flex;background:var(--secondary);padding:.25rem;border-radius:1rem}.mode-btn{flex:1;padding:.75rem;border:none;border-radius:.75rem;font-size:.95rem;font-weight:600;color:var(--text-sub);background:transparent;cursor:pointer;transition:all .2s}.mode-btn.active{background:#fff;color:var(--primary);box-shadow:0 2px 4px #0000000d}.btn-large{margin-top:auto;width:100%;padding:1rem;font-size:1.1rem}.practice-container{display:flex;flex-direction:column;height:100%;gap:1rem}.header-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.btn-text{background:none;border:none;color:var(--text-sub);font-weight:600;cursor:pointer;font-size:.9rem}.mode-badge{font-size:.8rem;background:var(--secondary);color:var(--primary);padding:.25rem .75rem;border-radius:1rem;font-weight:700}.display-container{flex:1;display:flex;flex-direction:column;justify-content:center;align-items:center;background:var(--secondary);border-radius:1.5rem;padding:2rem;margin-bottom:1rem;text-align:center;min-height:250px}.chinese-main{font-size:4rem;font-weight:800;color:var(--text-main);line-height:1.2;margin-bottom:1rem}.sub-info{display:flex;flex-direction:column;gap:.5rem;opacity:.8}.pinyin-text{font-size:1.5rem;color:var(--primary);font-weight:600}.number-sub{font-size:1.25rem;color:var(--text-sub);font-weight:500}.controls-area{margin-top:auto}.btn-row{display:flex;gap:1rem}.btn{flex:1;padding:.875rem;border:none;border-radius:1rem;font-size:1rem;font-weight:700;cursor:pointer;transition:all .2s}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 4px 6px #4f46e533}.btn-primary:hover{background:var(--primary-hover);transform:translateY(-2px)}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:#fff;color:var(--text-main);border:2px solid var(--border)}.btn-secondary:hover{border-color:var(--primary);color:var(--primary)}.btn-danger{background:#ef4444;color:#fff}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:fadeIn .4s cubic-bezier(.16,1,.3,1) forwards}