:root{--primary-color: #4CAF50;--bg-color: #f5fdf5;--card-bg: #ffffff;--text-main: #333333;--text-hint: #666666;--border-color: #e0e0e0;--accent-color: #ff9800}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background-color:var(--bg-color);color:var(--text-main);line-height:1.6}#root{max-width:600px;margin:0 auto;min-height:100vh;padding:20px}.container{display:flex;flex-direction:column;gap:20px}header{text-align:center;padding:20px 0}header h1{color:var(--primary-color);font-size:1.5rem}.card{background:var(--card-bg);border-radius:12px;padding:20px;box-shadow:0 4px 6px #0000000d}textarea{width:100%;height:120px;border:1px solid var(--border-color);border-radius:8px;padding:12px;font-size:1rem;resize:none;margin-bottom:12px}textarea:focus{outline:none;border-color:var(--primary-color)}.button{width:100%;padding:12px;border:none;border-radius:8px;background-color:var(--primary-color);color:#fff;font-size:1.1rem;font-weight:600;cursor:pointer;transition:opacity .2s}.button:disabled{opacity:.5;cursor:not-allowed}.word-list{display:flex;flex-wrap:wrap;gap:10px;margin-top:10px}.word-item{background:#e8f5e9;color:var(--primary-color);padding:4px 12px;border-radius:16px;font-size:.9rem}.playback-controls{display:flex;align-items:center;justify-content:space-between;margin-top:20px}.status-badge{font-size:.8rem;padding:2px 8px;border-radius:4px}.status-active{background:#fff3e0;color:#e65100}.status-idle{background:#f5f5f5;color:#757575}.timer-setting{display:flex;align-items:center;gap:10px;font-size:.9rem;color:var(--text-hint)}.timer-setting input{width:50px;padding:4px;border:1px solid var(--border-color);border-radius:4px}