*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--color-bg: #FAFAFA;--color-bg-gradient: linear-gradient(180deg, #FAFAFA 0%, #F0FDFA 100%);--color-surface: #FFFFFF;--color-surface-elevated: #FFFFFF;--color-primary: #14B8A6;--color-primary-light: #5EEAD4;--color-primary-dark: #0F766E;--color-primary-bg: #CCFBF1;--color-accent: #F59E0B;--color-accent-light: #FCD34D;--color-accent-bg: #FEF3C7;--color-success: #10B981;--color-success-bg: #D1FAE5;--color-text: #1F2937;--color-text-secondary: #6B7280;--color-text-muted: #9CA3AF;--color-text-inverse: #FFFFFF;--tone-1: #E11D48;--tone-2: #16A34A;--tone-3: #7C3AED;--tone-4: #2563EB;--tone-5: #6B7280;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-display: "Outfit", var(--font-sans);--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-3xl: 1.875rem;--text-4xl: 2.25rem;--text-5xl: 3rem;--text-6xl: 3.75rem;--font-normal: 400;--font-medium: 500;--font-semibold: 600;--font-bold: 700;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--space-20: 5rem;--space-24: 6rem;--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-2xl: 1.5rem;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--shadow-glow: 0 0 20px rgba(20, 184, 166, .3);--transition-fast: .15s ease;--transition-base: .3s ease;--transition-slow: .5s ease}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);background:var(--color-bg-gradient);color:var(--color-text);line-height:1.6;min-height:100vh;min-height:100dvh}#app{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column}.screen{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-6);max-width:480px;margin:0 auto;width:100%;animation:fadeIn var(--transition-base)}.screen-content{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;width:100%;gap:var(--space-6)}.screen-footer{width:100%;padding:var(--space-4) 0}.heading-1{font-family:var(--font-display);font-size:var(--text-4xl);font-weight:var(--font-bold);line-height:1.2;color:var(--color-text)}.heading-2{font-family:var(--font-display);font-size:var(--text-3xl);font-weight:var(--font-semibold);line-height:1.3;color:var(--color-text)}.heading-3{font-family:var(--font-display);font-size:var(--text-2xl);font-weight:var(--font-semibold);line-height:1.4;color:var(--color-text)}.text-body{font-size:var(--text-lg);line-height:1.7;color:var(--color-text-secondary)}.text-small{font-size:var(--text-sm);color:var(--color-text-muted)}.text-center{text-align:center}.phrase-card{background:var(--color-surface);border-radius:var(--radius-2xl);padding:var(--space-8);box-shadow:var(--shadow-lg);text-align:center;width:100%;animation:slideUp var(--transition-base)}.phrase-pinyin{font-family:var(--font-display);font-size:var(--text-5xl);font-weight:var(--font-bold);color:var(--color-primary-dark);margin-bottom:var(--space-3);letter-spacing:.02em}.phrase-meaning{font-size:var(--text-xl);color:var(--color-text-secondary);font-weight:var(--font-medium)}.phrase-card.highlight{background:linear-gradient(135deg,var(--color-primary-bg) 0%,var(--color-surface) 100%);box-shadow:var(--shadow-lg),var(--shadow-glow)}.pattern-container{display:flex;flex-direction:column;align-items:center;gap:var(--space-4);width:100%}.pattern-blocks{display:flex;align-items:center;justify-content:center;gap:var(--space-2);flex-wrap:wrap}.pattern-block{background:var(--color-surface);border:2px solid var(--color-primary-light);border-radius:var(--radius-lg);padding:var(--space-3) var(--space-5);font-family:var(--font-display);font-size:var(--text-2xl);font-weight:var(--font-semibold);color:var(--color-primary-dark);box-shadow:var(--shadow-md);transition:all var(--transition-fast)}.pattern-block.fixed{background:var(--color-primary-bg);border-color:var(--color-primary)}.pattern-block.swappable{background:var(--color-accent-bg);border-color:var(--color-accent);color:var(--color-accent);cursor:pointer;position:relative}.pattern-block.swappable:after{content:"✨";position:absolute;top:-8px;right:-8px;font-size:var(--text-sm)}.pattern-block.swappable:hover{transform:scale(1.05);box-shadow:var(--shadow-lg)}.pattern-meaning{font-size:var(--text-lg);color:var(--color-text-secondary);text-align:center}.speak-prompt{display:flex;flex-direction:column;align-items:center;gap:var(--space-3);padding:var(--space-6);animation:pulse 2s ease-in-out infinite}.speak-icon{width:64px;height:64px;background:var(--color-primary);border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;font-size:var(--text-3xl);box-shadow:var(--shadow-glow)}.speak-text{font-size:var(--text-lg);font-weight:var(--font-medium);color:var(--color-primary-dark)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-4) var(--space-8);font-family:var(--font-sans);font-size:var(--text-lg);font-weight:var(--font-semibold);border:none;border-radius:var(--radius-xl);cursor:pointer;transition:all var(--transition-fast);text-decoration:none;width:100%}.btn-primary{background:var(--color-primary);color:var(--color-text-inverse);box-shadow:var(--shadow-md)}.btn-primary:hover{background:var(--color-primary-dark);transform:translateY(-2px);box-shadow:var(--shadow-lg)}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:var(--color-surface);color:var(--color-primary);border:2px solid var(--color-primary)}.btn-secondary:hover{background:var(--color-primary-bg)}.btn-ghost{background:transparent;color:var(--color-text-secondary)}.btn-ghost:hover{color:var(--color-text);background:#0000000d}.btn-reveal{background:var(--color-surface);color:var(--color-primary);border:2px dashed var(--color-primary-light);padding:var(--space-6)}.btn-reveal:hover{border-style:solid;background:var(--color-primary-bg)}.progress-dots{display:flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-4)}.progress-dot{width:8px;height:8px;border-radius:var(--radius-full);background:var(--color-text-muted);opacity:.3;transition:all var(--transition-fast)}.progress-dot.active{opacity:1;background:var(--color-primary);width:24px}.progress-dot.completed{opacity:1;background:var(--color-success)}.input-field{width:100%;padding:var(--space-4) var(--space-5);font-family:var(--font-sans);font-size:var(--text-xl);font-weight:var(--font-medium);text-align:center;border:2px solid var(--color-primary-light);border-radius:var(--radius-xl);background:var(--color-surface);color:var(--color-text);outline:none;transition:all var(--transition-fast)}.input-field:focus{border-color:var(--color-primary);box-shadow:var(--shadow-glow)}.input-field::placeholder{color:var(--color-text-muted)}.dialogue-container{display:flex;flex-direction:column;gap:var(--space-4);width:100%}.dialogue-line{display:flex;gap:var(--space-3);align-items:flex-start;animation:slideUp var(--transition-base);animation-fill-mode:both}.dialogue-line:nth-child(1){animation-delay:0ms}.dialogue-line:nth-child(2){animation-delay:.3s}.dialogue-line:nth-child(3){animation-delay:.6s}.dialogue-line:nth-child(4){animation-delay:.9s}.dialogue-avatar{width:40px;height:40px;border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;font-size:var(--text-xl);flex-shrink:0}.dialogue-avatar.person-a{background:var(--color-primary-bg)}.dialogue-avatar.person-b{background:var(--color-accent-bg)}.dialogue-bubble{background:var(--color-surface);border-radius:var(--radius-xl);padding:var(--space-4);box-shadow:var(--shadow-sm);flex:1}.dialogue-bubble.highlight{background:var(--color-primary-bg);border:2px solid var(--color-primary-light)}.dialogue-pinyin{font-family:var(--font-display);font-size:var(--text-xl);font-weight:var(--font-semibold);color:var(--color-primary-dark);margin-bottom:var(--space-1)}.dialogue-meaning{font-size:var(--text-sm);color:var(--color-text-secondary)}.celebration{text-align:center;padding:var(--space-8)}.celebration-icon{font-size:80px;margin-bottom:var(--space-6);animation:bounce 1s ease infinite}.celebration-confetti{position:fixed;inset:0;pointer-events:none;overflow:hidden;z-index:100}.confetti-piece{position:absolute;width:10px;height:10px;background:var(--color-primary);animation:confettiFall 3s ease-out forwards}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.7}}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}@keyframes confettiFall{0%{transform:translateY(-100vh) rotate(0);opacity:1}to{transform:translateY(100vh) rotate(720deg);opacity:0}}@keyframes successPulse{0%{box-shadow:0 0 #10b98166}70%{box-shadow:0 0 0 20px #10b98100}to{box-shadow:0 0 #10b98100}}.success-pulse{animation:successPulse 1s ease}.hidden{display:none!important}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}.mt-2{margin-top:var(--space-2)}.mt-4{margin-top:var(--space-4)}.mt-6{margin-top:var(--space-6)}.mt-8{margin-top:var(--space-8)}.mb-2{margin-bottom:var(--space-2)}.mb-4{margin-bottom:var(--space-4)}.mb-6{margin-bottom:var(--space-6)}.mb-8{margin-bottom:var(--space-8)}.gap-2{gap:var(--space-2)}.gap-4{gap:var(--space-4)}.gap-6{gap:var(--space-6)}@media(max-width:400px){:root{--text-5xl: 2.5rem;--text-4xl: 2rem;--text-3xl: 1.5rem}.phrase-card{padding:var(--space-6)}.pattern-block{font-size:var(--text-xl);padding:var(--space-2) var(--space-4)}}.dark-mode{--color-bg: #0F172A;--color-bg-gradient: linear-gradient(180deg, #0F172A 0%, #1E293B 100%);--color-surface: #1E293B;--color-surface-elevated: #334155;--color-text: #F1F5F9;--color-text-secondary: #94A3B8;--color-text-muted: #64748B;--color-primary-dark: #5EEAD4;--shadow-glow: 0 0 20px rgba(94, 234, 212, .3)}@media(prefers-color-scheme:dark){body:not(.light-mode){--color-bg: #0F172A;--color-bg-gradient: linear-gradient(180deg, #0F172A 0%, #1E293B 100%);--color-surface: #1E293B;--color-surface-elevated: #334155;--color-text: #F1F5F9;--color-text-secondary: #94A3B8;--color-text-muted: #64748B;--color-primary-dark: #5EEAD4;--shadow-glow: 0 0 20px rgba(94, 234, 212, .3)}}.theme-toggle{position:fixed;top:var(--space-4);right:var(--space-4);width:48px;height:48px;border-radius:var(--radius-full);background:var(--color-surface);border:2px solid var(--color-primary-light);box-shadow:var(--shadow-md);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1.5rem;transition:all var(--transition-fast);z-index:1000}.theme-toggle:hover{transform:scale(1.1);box-shadow:var(--shadow-lg);border-color:var(--color-primary)}.theme-toggle:active{transform:scale(.95)}.theme-toggle .icon-sun{display:block}.theme-toggle .icon-moon,.dark-mode .theme-toggle .icon-sun{display:none}.dark-mode .theme-toggle .icon-moon{display:block}@media(prefers-color-scheme:dark){body:not(.light-mode) .theme-toggle .icon-sun{display:none}body:not(.light-mode) .theme-toggle .icon-moon{display:block}}