@import"https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;700&display=swap";:root{--bg-color: #fcfbf9;--text-color: #2c2929;--card-bg: #ffffff;--primary: #c0392b;--primary-hover: #a93226;--accent: #e67e22;--success: #27ae60;--border: #e0e0e0;--subtle-text: #7f8c8d;--shadow-sm: 0 1px 3px rgba(0,0,0,.05);--shadow-md: 0 4px 6px rgba(0,0,0,.05);--shadow-lg: 0 10px 15px rgba(0,0,0,.05);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 20px;--font-main: "Outfit", system-ui, -apple-system, sans-serif}body{margin:0;font-family:var(--font-main);background-color:var(--bg-color);color:var(--text-color);-webkit-font-smoothing:antialiased;min-height:100vh}button{font-family:inherit;cursor:pointer;border:none;background:none}h1,h2,h3{margin:0;font-weight:600}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#dcdcdc;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#bdc3c7}.fade-in{animation:fadeIn .4s ease-out}.canvas-board{display:flex;justify-content:center;align-items:center;padding:2rem;width:100%}.chars-wrapper{display:flex;flex-wrap:wrap;justify-content:center;gap:1rem}.hanzi-target{min-width:300px;min-height:300px}.canvas-container{position:relative;background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:1rem;transition:transform .3s ease,box-shadow .3s ease}.canvas-container.test{border:2px solid var(--accent)}.canvas-container.practice{border:2px solid var(--success)}.canvas-loading{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:#ffffffe6;color:var(--subtle-text);font-weight:500;border-radius:var(--radius-lg)}.spinner{width:24px;height:24px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin 1s linear infinite;margin-bottom:.5rem}@keyframes spin{to{transform:rotate(360deg)}}.tutor-container{max-width:1000px;margin:0 auto;padding:1rem;display:flex;flex-direction:column;height:100vh;box-sizing:border-box}.app-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem;padding-bottom:1rem;border-bottom:1px solid var(--border)}.left-controls{display:flex;align-items:center;gap:1rem}.app-header h1{margin:0;font-size:1.5rem}.lesson-subtitle{margin:0;font-size:.9rem;color:var(--primary);font-weight:600}.icon-btn{padding:.5rem;color:var(--text-color);border-radius:var(--radius-sm);transition:background .2s}.icon-btn:hover{background:#0000000d}.progress-badge{font-weight:500;color:var(--subtle-text);background:var(--card-bg);padding:.5rem 1rem;border-radius:20px;box-shadow:var(--shadow-sm)}.main-stage{flex:1;display:flex;flex-direction:column;gap:2rem}.progress-stepper{display:flex;justify-content:center;align-items:center;gap:1rem}.step{display:flex;align-items:center;gap:.5rem;padding:.8rem 1.5rem;border-radius:30px;background:var(--card-bg);color:var(--subtle-text);box-shadow:var(--shadow-sm);font-weight:500;transition:all .3s ease}.step:hover{transform:translateY(-2px);background:#fff}.step.active{background:var(--primary);color:#fff;box-shadow:0 4px 10px #c0392b4d}.step.completed:not(.active){color:var(--success);border:1px solid var(--success)}.step-line{width:40px;height:2px;background:var(--border)}.stage-content{display:flex;align-items:center;justify-content:center;gap:2rem;flex:1}.character-info-box{display:flex;align-items:center;justify-content:center;gap:1rem;background:#fff;padding:.8rem 2rem;border-radius:var(--radius-md);box-shadow:var(--shadow-sm);border:1px solid var(--border);animation:fadeIn .3s ease-out}.character-info-box .meaning{font-size:1.5rem;font-weight:700;color:var(--text-color)}.character-info-box .pinyin{font-size:1.2rem;color:var(--primary);font-weight:500}.speak-btn{display:flex;align-items:center;justify-content:center;padding:.5rem;background:#fdf2f2;color:var(--primary);border-radius:50%;transition:all .2s}.speak-btn:hover{background:var(--primary);color:#fff;transform:scale(1.1)}.board-wrapper{display:flex;flex-direction:column;align-items:center;gap:1.5rem}.instruction-text{font-size:1.2rem;color:var(--subtle-text);font-weight:300}.action-btn{display:flex;align-items:center;gap:.5rem;padding:.8rem 2rem;border-radius:var(--radius-md);font-weight:600;font-size:1rem;transition:all .2s}.action-btn.primary{background:var(--primary);color:#fff;box-shadow:0 4px 10px #c0392b4d}.action-btn.primary:hover{background:var(--primary-hover);transform:translateY(-2px)}.nav-btn{padding:1rem;border-radius:50%;background:#fff;box-shadow:var(--shadow-md);color:var(--text-color);transition:all .2s}.nav-btn:hover:not(:disabled){transform:scale(1.1);color:var(--primary)}.nav-btn:disabled{opacity:.3;cursor:not-allowed;box-shadow:none}.menu-overlay{position:fixed;inset:0;background:#fffffff2;z-index:100;display:flex;flex-direction:column;padding:2rem;animation:fadeIn .2s ease-out}.menu-grid{max-width:800px;margin:0 auto;width:100%}.menu-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem}.char-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:1rem}.char-card{aspect-ratio:1;background:#fff;border:1px solid var(--border);border-radius:var(--radius-md);font-size:2.5rem;display:flex;align-items:center;justify-content:center;position:relative;transition:all .2s}.char-card:hover{border-color:var(--primary);transform:translateY(-4px);box-shadow:var(--shadow-md)}.char-card.active{border-color:var(--primary);background:#fff5f5;color:var(--primary)}.char-card.done{border-color:var(--success)}.check-mark{position:absolute;top:8px;right:8px;color:var(--success)}.lesson-selector{padding:1rem 0}.lesson-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.5rem}.lesson-card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-md);padding:1.5rem;display:flex;gap:1rem;align-items:flex-start;text-align:left;transition:all .3s cubic-bezier(.4,0,.2,1);position:relative;box-shadow:var(--shadow-sm)}.lesson-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:var(--primary)}.lesson-card.active{border-color:var(--primary);background:#fff5f5;box-shadow:0 0 0 2px var(--primary)}.lesson-card.completed{border-color:var(--success)}.lesson-icon{background:#fdf2f2;color:var(--primary);padding:.8rem;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center}.lesson-card.completed .lesson-icon{background:#f0fdf4;color:var(--success)}.lesson-info h3{margin:0 0 .5rem;font-size:1.1rem;color:var(--text-color)}.lesson-info p{margin:0 0 .8rem;font-size:.9rem;color:var(--subtle-text);line-height:1.4}.lesson-progress-text{font-size:.85rem;font-weight:600;color:var(--subtle-text)}.lesson-check{position:absolute;top:1rem;right:1rem;color:var(--success)}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}