:root{--color-primary: #8B5CF6;--color-primary-dark: #7C3AED;--color-primary-light: #A78BFA;--color-secondary: #FF6B35;--color-accent: #FFD700;--color-pink: #FF6B9D;--color-sky: #4ECDC4;--color-green: #2ECC71;--bg-page: #FFF8F0;--bg-card: #FFFFFF;--bg-teacher: #1a1a2e;--bg-section-alt: #F3EEFF;--bg-step: #F8F4FF;--text-primary: #2D3436;--text-secondary: #636E72;--text-muted: #B2BEC3;--text-on-dark: #FFFFFF;--text-teacher: #FFFFFF;--font-playful: "ZCOOL KuaiLe", "Comic Sans MS", cursive, sans-serif;--font-body: -apple-system, BlinkMacSystemFont, "Noto Sans SC", "Microsoft YaHei", sans-serif;--text-xs: 14px;--text-sm: 16px;--text-base: 18px;--text-lg: 22px;--text-xl: 28px;--text-2xl: 36px;--text-3xl: 48px;--teacher-step: 42px;--teacher-title: 56px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 20px;--radius-xl: 28px;--radius-round: 999px;--shadow-sm: 0 2px 8px rgba(0,0,0,.06);--shadow-md: 0 4px 16px rgba(0,0,0,.1);--shadow-lg: 0 8px 32px rgba(0,0,0,.12);--shadow-button: 0 4px 12px rgba(0,0,0,.15);--touch-min: 56px;--transition-fast: .15s ease;--transition-normal: .3s ease;--transition-slow: .5s ease;--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--space-3xl: 64px;--shadow-glow: 0 0 20px rgba(139,92,246,.3)}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-body);color:var(--text-primary);background:var(--bg-page);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased}img{max-width:100%;height:auto;display:block}a{color:inherit;text-decoration:none}button{border:none;background:none;cursor:pointer;font-family:inherit;font-size:inherit;touch-action:manipulation}ul,ol{list-style:none}input,textarea{font-family:inherit;font-size:inherit}h1,h2,h3,h4{font-family:var(--font-playful);line-height:1.3}h1{font-size:var(--text-3xl)}h2{font-size:var(--text-2xl)}h3{font-size:var(--text-xl)}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 var(--space-lg)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);min-height:var(--touch-min);min-width:var(--touch-min);padding:var(--space-md) var(--space-xl);border-radius:var(--radius-lg);font-family:var(--font-playful);font-size:var(--text-lg);font-weight:600;transition:all var(--transition-normal);-webkit-user-select:none;user-select:none}.btn:active{transform:scale(.95)}.btn-primary{background:var(--color-primary);color:var(--text-on-dark);box-shadow:var(--shadow-button)}.btn-primary:hover{background:var(--color-primary-dark);box-shadow:var(--shadow-lg)}.btn-secondary{background:var(--color-secondary);color:var(--text-on-dark)}.btn-secondary:hover{background:#e55a2b}.btn-outline{border:2px solid var(--color-primary);color:var(--color-primary);background:transparent}.btn-outline:hover{background:var(--color-primary);color:var(--text-on-dark)}.btn-large{padding:var(--space-xl) var(--space-2xl);font-size:var(--text-xl);border-radius:var(--radius-xl);min-height:72px}.card{background:var(--bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:all var(--transition-normal);overflow:hidden}.card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.tag{display:inline-flex;align-items:center;gap:var(--space-xs);padding:var(--space-xs) var(--space-md);border-radius:var(--radius-round);font-size:var(--text-sm);font-weight:500;background:var(--color-primary-light);color:var(--text-on-dark)}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.fade-in{animation:fadeIn .5s ease forwards}html,body,#root{height:100%}#root{display:flex;flex-direction:column}@media (max-width: 768px){html{font-size:15px}h1{font-size:var(--text-2xl)}h2{font-size:var(--text-xl)}h3{font-size:var(--text-lg)}.container{padding:0 var(--space-md)}.btn{padding:var(--space-sm) var(--space-md);font-size:var(--text-base);min-height:48px}.btn-large{padding:var(--space-md) var(--space-lg);font-size:var(--text-lg);min-height:56px}.mobile-hide{display:none!important}.mobile-full{padding-left:0!important;padding-right:0!important}.mobile-stack{flex-direction:column!important}.grid-2,.grid-3{grid-template-columns:1fr!important}}@media (max-width: 480px){html{font-size:14px}.container{padding:0 var(--space-sm)}}@media (min-width: 769px){.mobile-only{display:none!important}}@media (max-width: 768px){::-webkit-scrollbar{width:4px;height:4px}::-webkit-scrollbar-thumb{background:var(--color-primary-light);border-radius:4px}}@media (max-width: 480px){.floating-qr-popup{right:50%!important;transform:translate(50%)!important;width:200px!important;bottom:80px!important}}.teacher-mode{background:var(--bg-teacher);color:var(--text-teacher);min-height:100vh}.teacher-mode .step-image{max-height:55vh;object-fit:contain;border-radius:var(--radius-lg);box-shadow:var(--shadow-glow)}.teacher-mode .step-text{font-size:var(--teacher-step);font-family:var(--font-playful);color:var(--text-teacher);text-align:center;line-height:1.4;padding:var(--space-lg)}.teacher-mode .step-number{font-size:var(--text-lg);color:var(--color-accent);opacity:.8}.teacher-mode .teacher-note{background:#ffd70026;border-left:4px solid var(--color-accent);padding:var(--space-md) var(--space-lg);border-radius:var(--radius-sm);font-size:var(--text-lg);color:var(--color-accent)}.teacher-mode .nav-btn{background:#ffffff1a;color:var(--text-teacher);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2);font-size:var(--text-2xl);padding:var(--space-lg) var(--space-xl);border-radius:var(--radius-round);transition:all var(--transition-fast)}.teacher-mode .nav-btn:hover{background:#fff3;transform:scale(1.05)}.teacher-mode .dot-active{background:var(--color-accent);box-shadow:0 0 12px var(--color-accent)}.teacher-mode .dot-inactive{background:#ffffff4d}.teacher-mode .materials-bar{background:#ffffff0d;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);border-top:1px solid rgba(255,255,255,.1)}.student-mode{background:var(--bg-page);color:var(--text-primary)}.student-mode .step-image{max-height:40vh;object-fit:contain;border-radius:var(--radius-lg);box-shadow:var(--shadow-md)}.student-mode .step-text{font-size:var(--text-xl);font-family:var(--font-playful);color:var(--text-primary);text-align:center;line-height:1.5;padding:var(--space-md)}.student-mode .nav-btn{background:var(--color-primary);color:var(--text-on-dark);font-size:var(--text-lg);padding:var(--space-md) var(--space-xl);border-radius:var(--radius-lg);box-shadow:var(--shadow-button);transition:all var(--transition-fast);min-width:140px}.student-mode .nav-btn:hover{background:var(--color-primary-dark);transform:translateY(-2px)}.student-mode .nav-btn:disabled{opacity:.4;cursor:not-allowed;transform:none}.student-mode .dot-active{background:var(--color-primary);transform:scale(1.3)}.student-mode .dot-inactive{background:var(--text-muted)}.student-mode .progress-text{font-family:var(--font-playful);font-size:var(--text-lg);color:var(--text-secondary)}@keyframes celebrate{0%{transform:scale(0);opacity:0}50%{transform:scale(1.2)}to{transform:scale(1);opacity:1}}.student-mode .celebrate{animation:celebrate .6s ease forwards}