:root{--background:#0f172a;--foreground:#f1f5f9;--primary:#60a5fa;--primary-hover:#3b82f6;--secondary:#1e293b;--accent:#a78bfa;--success:#34d399;--card-bg:#1e293b;--card-border:#475569;--text-muted:#cbd5e1;--heading-gradient:linear-gradient(to right,#fff,#cbd5e1);--font-sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,"Open Sans","Helvetica Neue",sans-serif;--word-of-day-bg:linear-gradient(135deg,var(--primary),var(--accent));--word-of-day-text:white;--btn-inactive-text:#fff}[data-theme=sakura]{--background:#fdf2f8;--foreground:#831843;--primary:#db2777;--primary-hover:#be185d;--secondary:#fce7f3;--accent:#ec4899;--success:#059669;--card-bg:#fff;--card-border:#fbcfe8;--text-muted:#9d174d;--heading-gradient:linear-gradient(to right,#831843,#db2777);--word-of-day-bg:linear-gradient(135deg,var(--primary),var(--accent));--word-of-day-text:white;--btn-inactive-text:#831843}[data-theme=ocean]{--background:#f0f9ff;--foreground:#0c4a6e;--primary:#0ea5e9;--primary-hover:#0284c7;--secondary:#e0f2fe;--accent:#38bdf8;--success:#059669;--card-bg:#fff;--card-border:#bae6fd;--text-muted:#075985;--heading-gradient:linear-gradient(to right,#0c4a6e,#0ea5e9);--word-of-day-bg:linear-gradient(135deg,var(--primary),var(--accent));--word-of-day-text:white;--btn-inactive-text:#0c4a6e}[data-theme=forest]{--background:#f0fdf4;--foreground:#14532d;--primary:#16a34a;--primary-hover:#15803d;--secondary:#dcfce7;--accent:#22c55e;--success:#15803d;--card-bg:#fff;--card-border:#bbf7d0;--text-muted:#166534;--heading-gradient:linear-gradient(to right,#14532d,#16a34a);--word-of-day-bg:linear-gradient(135deg,var(--primary),var(--accent));--word-of-day-text:white;--btn-inactive-text:#14532d}[data-theme=pixel]{--background:#fff176;--foreground:#000;--primary:#000;--primary-hover:#333;--secondary:#fff;--accent:#ffeb3b;--success:#000;--card-bg:#fffde7;--card-border:#000;--text-muted:#000;--heading-gradient:linear-gradient(to right,#000,#333);--font-sans:var(--font-pixel),"Courier New",monospace;--word-of-day-bg:var(--primary);--word-of-day-text:var(--accent);--btn-inactive-text:#000}[data-theme=pixel] .btn,[data-theme=pixel] .card,[data-theme=pixel] .input,[data-theme=pixel] .auth-card,[data-theme=pixel] .bottom-nav,[data-theme=pixel] .nav-item{border-radius:0!important}[data-theme=pixel] h1{-webkit-text-fill-color:initial;color:var(--foreground);background:0 0}[data-theme=pixel] .card,[data-theme=pixel] .btn,[data-theme=pixel] .auth-card{border:2px solid #000!important;box-shadow:4px 4px #000!important}[data-theme=pixel] .btn:active{transform:translate(2px,2px);box-shadow:2px 2px #000!important}[data-theme=pixel] .bottom-nav{background:#fff176;border-top:2px solid #000}*{box-sizing:border-box;margin:0;padding:0}html,body{background:var(--background);max-width:100vw;color:var(--foreground);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;overflow-x:hidden}a{color:inherit;text-decoration:none}.container{flex-direction:column;max-width:600px;min-height:100vh;margin:0 auto;padding:1rem;display:flex}.btn{cursor:pointer;border:none;border-radius:12px;justify-content:center;align-items:center;padding:.75rem 1.5rem;font-size:1rem;font-weight:600;transition:all .2s;display:inline-flex}.btn-primary{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;box-shadow:0 4px 12px #3b82f64d}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 16px #3b82f666}.card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:16px;margin-bottom:1rem;padding:1.5rem;transition:transform .2s;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f}.card:hover{border-color:var(--primary);transform:translateY(-2px)}.input{background:var(--secondary);border:2px solid var(--card-border);width:100%;color:var(--foreground);border-radius:12px;padding:1rem;font-size:1rem;transition:border-color .2s}.input:focus{border-color:var(--primary);outline:none}h1{background:var(--heading-gradient);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-bottom:1rem;font-size:2rem;font-weight:800}h2{margin-bottom:.75rem;font-size:1.5rem;font-weight:700}p{color:var(--text-muted);line-height:1.6}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:.5s ease-out forwards fadeIn}.bottom-nav{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-top:1px solid var(--card-border);padding:1rem .5rem;padding-bottom:max(1rem,env(safe-area-inset-bottom));z-index:100;background:#0f172ae6;justify-content:space-around;display:flex;position:fixed;bottom:0;left:0;right:0}.nav-item{color:var(--text-muted);flex-direction:column;align-items:center;gap:4px;font-size:.75rem;font-weight:500;transition:color .2s;display:flex}.nav-item:hover,.nav-item.active{color:var(--primary)}.nav-item .icon{font-size:1.5rem}.auth-container{justify-content:center;align-items:center;min-height:80vh;padding:1rem;display:flex}.auth-card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:24px;width:100%;max-width:400px;padding:2.5rem;box-shadow:0 20px 25px -5px #0000001a,0 10px 10px -5px #0000000a}.auth-card h1{text-align:center;margin-bottom:.5rem;font-size:1.75rem}.auth-subtitle{text-align:center;margin-bottom:2rem;font-size:.95rem}.auth-form{flex-direction:column;gap:1.25rem;display:flex}.form-group{flex-direction:column;gap:.5rem;display:flex}.form-group label{color:var(--foreground);margin-left:.25rem;font-size:.875rem;font-weight:600}.form-group input{background:var(--secondary);border:1px solid var(--card-border);color:var(--foreground);border-radius:12px;padding:.875rem 1rem;font-size:1rem;transition:all .2s}.form-group input:focus{border-color:var(--primary);outline:none;box-shadow:0 0 0 2px #3b82f633}.auth-button{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:12px;margin-top:.5rem;padding:1rem;font-size:1rem;font-weight:600;transition:all .2s}.auth-button:hover{background:var(--primary-hover);transform:translateY(-1px)}.auth-button:disabled{opacity:.7;cursor:not-allowed}.auth-footer{text-align:center;margin-top:1.5rem;font-size:.875rem}.auth-footer a{color:var(--primary);font-weight:600}.auth-footer a:hover{text-decoration:underline}.error-message{color:#ef4444;text-align:center;background:#ef44441a;border:1px solid #ef444433;border-radius:12px;margin-bottom:1.5rem;padding:.75rem;font-size:.875rem}@media print{.bottom-nav,.btn,header button{display:none!important}body{color:#000;background:#fff}.card{box-shadow:none;break-inside:avoid;border:1px solid #ccc}main{padding-bottom:0!important}}@keyframes shake{10%,90%{transform:translate(-1px)}20%,80%{transform:translate(2px)}30%,50%,70%{transform:translate(-4px)}40%,60%{transform:translate(4px)}}.shake-screen,.shake{animation:.5s cubic-bezier(.36,.07,.19,.97) both shake}.pinyin-stream-title{background:linear-gradient(90deg,#f472b6,#a78bfa);-webkit-text-fill-color:transparent;-webkit-background-clip:text;font-weight:800}
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