:root{--glass-bg: rgba(255, 255, 255, .7);--glass-border: rgba(255, 255, 255, .4);--glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, .05);--primary-color: #3b82f6;--success-color: #10b981;--error-color: #ef4444;--text-main: #334155;--font-sans: "Inter", -apple-system, "Microsoft YaHei", sans-serif;--modal-bg: rgba(255, 255, 255, .85);--modal-blur: blur(24px);--transition-smooth: all .3s cubic-bezier(.25, .8, .25, 1)}body{font-family:var(--font-sans);margin:0;padding:0;color:var(--text-main);background-color:#f8fafc;background-image:radial-gradient(at 0% 0%,hsla(253,16%,7%,0) 0,transparent 50%),radial-gradient(at 50% 0%,hsla(225,100%,70%,.08) 0,transparent 50%),radial-gradient(at 100% 0%,hsla(339,100%,70%,.08) 0,transparent 50%);background-attachment:fixed;min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.grid-container{display:flex;flex-wrap:wrap;border-radius:20px;overflow:hidden;box-shadow:var(--glass-shadow);background:var(--glass-bg);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border:1px solid var(--glass-border);margin-top:24px;padding:2px}.grid-row{display:flex;width:100%}.grid-cell{display:flex;flex-direction:column;width:65px;height:90px;border-right:1px solid rgba(0,0,0,.03);border-bottom:1px solid rgba(0,0,0,.03);box-sizing:border-box;position:relative;transition:var(--transition-smooth)}.pinyin-part{height:32%;display:flex;justify-content:center;align-items:center;background-color:#f8fafc99;font-size:13px;font-weight:500;color:#64748b;position:relative}.hanzi-part{height:68%;display:flex;justify-content:center;align-items:center;font-size:28px;font-weight:600;color:#1e293b;transition:var(--transition-smooth)}.clickable-hanzi{cursor:pointer}.clickable-hanzi:hover{background:#f1f5f9cc}.clickable-hanzi:hover .hanzi-part{color:var(--primary-color);transform:scale(1.15)}.practice-input{width:100%;height:100%;border:none;text-align:center;font-size:16px;font-weight:600;box-sizing:border-box;position:absolute;left:0;top:0;background:transparent;transition:var(--transition-smooth);color:#0f172a;outline:none}.practice-input:focus{background-color:#3b82f614;box-shadow:inset 0 0 0 2px var(--primary-color);z-index:2;border-radius:8px}.incorrect{background-color:#ef44441a!important;animation:shake .4s cubic-bezier(.36,.07,.19,.97) both}.current-input{background-color:#3b82f60f;box-shadow:inset 0 0 0 2px var(--primary-color);border-radius:8px;z-index:1}.completed{background-color:#10b9810f;box-shadow:inset 0 0 0 2px var(--success-color);border-radius:8px}.completed-hanzi{color:var(--success-color)}.timeout-warning{background-color:#ef444426!important;transition:background-color .5s ease}@keyframes shake{10%,90%{transform:translate3d(-1px,0,0)}20%,80%{transform:translate3d(2px,0,0)}30%,50%,70%{transform:translate3d(-4px,0,0)}40%,60%{transform:translate3d(4px,0,0)}}@keyframes slideDown{0%{transform:translateY(-20px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes fadeInScale{0%{transform:translate(-50%,-50%) scale(.95);opacity:0}to{transform:translate(-50%,-50%) scale(1);opacity:1}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal-overlay{display:none;position:fixed;inset:0;background:#0f172a80;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:2000;animation:fadeIn .3s ease}.message-box,.help-tooltip,.pinyin-hint,.hint-message{display:none;position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background:var(--modal-bg);-webkit-backdrop-filter:var(--modal-blur);backdrop-filter:var(--modal-blur);padding:40px;border-radius:28px;box-shadow:0 25px 50px -12px #00000040,inset 0 0 0 1px var(--glass-border);z-index:2001;text-align:center;max-width:90vw;width:440px;animation:fadeInScale .4s cubic-bezier(.16,1,.3,1) forwards}.message-box h2,.help-tooltip h3{margin-top:0;color:#0f172a;font-size:26px;font-weight:800;margin-bottom:24px;background:linear-gradient(135deg,#1e293b,#334155);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.message-box p{color:#475569;font-size:16px;margin:12px 0;line-height:1.6}.message-box span{font-weight:700;color:var(--primary-color)}.close-btn,.close-help{background:linear-gradient(135deg,var(--primary-color),#2563eb);color:#fff;border:none;padding:14px 36px;border-radius:14px;font-size:16px;font-weight:600;cursor:pointer;margin-top:28px;transition:var(--transition-smooth);box-shadow:0 8px 16px -4px #3b82f666;width:100%}.close-btn:hover,.close-help:hover{transform:translateY(-2px);box-shadow:0 12px 20px -4px #3b82f680}.help-tooltip ul{text-align:left;padding-left:20px;color:#475569}.help-tooltip li{margin-bottom:12px;line-height:1.6}.pinyin-hint,.hint-message{background:linear-gradient(135deg,#3b82f6f2,#2563ebf2);color:#fff;width:auto;min-width:220px;padding:24px 36px;border-radius:20px}.hint-message{background:linear-gradient(135deg,#f59e0bf2,#d97706f2)}.pinyin-hint .hint-title{font-size:14px;text-transform:uppercase;letter-spacing:1.5px;opacity:.8;margin-bottom:12px;font-weight:700}.practice-timer{position:fixed;top:76px;left:24px;background:var(--modal-bg);-webkit-backdrop-filter:var(--modal-blur);backdrop-filter:var(--modal-blur);padding:16px 24px;border-radius:16px;font-size:15px;font-weight:600;color:#334155;z-index:1000;box-shadow:0 10px 25px -5px #0000001a,inset 0 0 0 1px var(--glass-border);display:none;animation:slideDown .4s cubic-bezier(.16,1,.3,1);display:flex!important;flex-direction:column;gap:8px;transform:translateY(-200%);transition:transform .5s cubic-bezier(.16,1,.3,1)}.practice-timer[style*="display: block"]{transform:translateY(0)}.practice-timer .timer-value{color:var(--primary-color);font-weight:800;margin-left:6px}.practice-timer .speed-value{color:#f59e0b;font-weight:800;margin-left:6px}.practice-progress{position:fixed;top:0;left:0;right:0;background:#fffffff2;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);padding:16px 32px;z-index:1001;box-shadow:0 4px 20px -5px #0000001a;display:none;animation:slideDown .4s ease;border-bottom:1px solid rgba(0,0,0,.05)}.progress-info{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;color:#334155;font-weight:700;font-size:15px}.progress-stats{background:#f1f5f9;padding:6px 16px;border-radius:20px;font-size:14px;color:var(--primary-color)}.progress-bar-container{width:100%;height:8px;background-color:#e2e8f0;border-radius:4px;overflow:hidden}.progress-bar{height:100%;background:linear-gradient(90deg,#3b82f6,#8b5cf6,#ec4899);background-size:200% 200%;border-radius:4px;width:0%;transition:width .5s cubic-bezier(.4,0,.2,1);animation:gradientMove 3s ease infinite}@keyframes gradientMove{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}.pause-button{position:fixed;bottom:32px;left:32px;background:var(--modal-bg);-webkit-backdrop-filter:var(--modal-blur);backdrop-filter:var(--modal-blur);color:#334155;border:1px solid var(--glass-border);padding:14px 24px;border-radius:16px;font-weight:700;cursor:pointer;z-index:1000;box-shadow:0 10px 25px -5px #0000001a;display:none;transition:var(--transition-smooth)}.pause-button:hover{transform:translateY(-3px);box-shadow:0 15px 30px -5px #00000026;color:var(--primary-color)}.pause-overlay{position:fixed;inset:0;background:#0f172ab3;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);display:none;justify-content:center;align-items:center;z-index:2500;animation:fadeIn .4s ease}.pause-message{background:var(--modal-bg);padding:56px 48px;border-radius:36px;text-align:center;box-shadow:0 30px 60px -15px #0006,inset 0 0 0 1px var(--glass-border);width:90%;max-width:480px;animation:fadeInScale .5s cubic-bezier(.16,1,.3,1)}.pause-message .pause-icon{font-size:72px;background:linear-gradient(135deg,#3b82f6,#8b5cf6);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:32px}.resume-button{background:linear-gradient(135deg,#10b981,#059669);color:#fff;border:none;padding:18px 48px;border-radius:18px;font-size:18px;font-weight:700;cursor:pointer;margin-top:40px;transition:var(--transition-smooth);box-shadow:0 10px 25px #10b9814d;width:100%}.resume-button:hover{transform:translateY(-3px);box-shadow:0 15px 35px #10b98166}.user-manual{position:fixed;inset:0;background:#0f172a99;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:3000;display:none;overflow-y:auto;padding:40px 20px;animation:fadeIn .3s ease}.manual-content{background:var(--modal-bg);border:1px solid var(--glass-border);width:100%;max-width:800px;margin:0 auto;border-radius:32px;padding:56px;box-shadow:0 30px 60px -15px #0003;animation:fadeInScale .4s cubic-bezier(.16,1,.3,1)}.manual-content h2{font-size:32px;font-weight:800;background:linear-gradient(135deg,#3b82f6,#8b5cf6);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;text-align:center;margin-bottom:48px}.manual-section{margin-bottom:40px}.manual-section h3{color:#1e293b;font-size:22px;font-weight:700;margin-bottom:20px;display:flex;align-items:center;gap:12px}.manual-section h3 i{color:var(--primary-color)}.manual-section p,.manual-section li{color:#475569;line-height:1.7;font-size:16px}.manual-section li{margin-bottom:12px}.close-manual{background:#f1f5f9;color:#334155;border:none;padding:16px 40px;border-radius:16px;font-size:16px;font-weight:700;cursor:pointer;transition:var(--transition-smooth);display:inline-block;margin-top:24px}.close-manual:hover{background:#e2e8f0;color:#0f172a;transform:translateY(-2px)}.manual-link{color:var(--primary-color);cursor:pointer;transition:var(--transition-smooth);font-weight:600}.manual-link:hover{color:#1d4ed8;text-decoration:underline}.char-count-area.warning{color:var(--error-color)!important;animation:shake .4s}textarea:disabled,button:disabled{opacity:.5!important;cursor:not-allowed!important;transform:none!important;box-shadow:none!important}@media(max-width:768px){.grid-cell{width:55px;height:80px}.hanzi-part{font-size:24px}.message-box,.pause-message{padding:32px 24px;width:90%;border-radius:24px}.manual-content{padding:32px 24px;border-radius:24px}.practice-timer{top:16px;left:16px;padding:12px 16px}}