@import "https://fonts.googleapis.com/css2?family=Montserrat:wght@600;700;800&family=Manrope:wght@300;400;500;600&display=swap";:root{--bg-color:#09090b;--surface-color:#18181bb3;--primary-color:#3b82f6;--secondary-color:#ec4899;--tertiary-color:#8b5cf6;--text-primary:#fafafa;--text-secondary:#a1a1aa;--border-color:#ffffff14;--glass-bg:#18181b66;--glass-border:#ffffff14;--glow-color:#8b5cf666}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-primary);min-height:100vh;font-family:Manrope,sans-serif;position:relative;overflow-x:hidden}body:before,body:after{content:"";filter:blur(100px);z-index:-1;opacity:.6;border-radius:50%;animation:20s infinite alternate floatBlobs;position:fixed}body:before{background:radial-gradient(circle, var(--secondary-color) 0%, transparent 70%);width:50vw;height:50vw;animation-delay:-5s;top:-10%;left:-10%}body:after{background:radial-gradient(circle, var(--primary-color) 0%, transparent 70%);width:60vw;height:60vw;bottom:-10%;right:-10%}@keyframes floatBlobs{0%{transform:translate(0)scale(1)}33%{transform:translate(5%,5%)scale(1.1)}66%{transform:translate(-5%,10%)scale(.9)}to{transform:translateY(-5%)scale(1)}}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg-color)}::-webkit-scrollbar-thumb{background:#fff3;border-radius:10px}::-webkit-scrollbar-thumb:hover{background:#fff6}#root{flex-direction:column;min-height:100vh;display:flex}h1,h2,h3,h4{letter-spacing:-.04em;font-family:Montserrat,sans-serif;font-weight:700;line-height:1.2}h1{background:linear-gradient(135deg,#fff 0%,#a1a1aa 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-bottom:.5rem;font-size:3rem;font-weight:800}.app-container{width:92%;max-width:1500px;margin:0 auto;padding:2rem}.header{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;margin-bottom:3rem;padding-bottom:1.5rem;display:flex}.glass-card{background:var(--glass-bg);-webkit-backdrop-filter:blur(20px);border:1px solid var(--glass-border);border-radius:24px;padding:2.5rem;transition:transform .4s cubic-bezier(.175,.885,.32,1.275),box-shadow .4s,border-color .4s;position:relative;overflow:hidden;box-shadow:0 4px 30px #0000001a}.glass-card:before{content:"";background:linear-gradient(90deg,#0000,#fff3,#0000);height:1px;position:absolute;top:0;left:0;right:0}.glass-card:hover{border-color:#fff3;transform:translateY(-8px);box-shadow:0 20px 40px -10px #00000080}.feature-grid{grid-template-columns:repeat(3,1fr);gap:2.5rem;margin-top:2rem;display:grid}@media (width<=1200px){.feature-grid{grid-template-columns:repeat(2,1fr)}}@media (width<=768px){.feature-grid{grid-template-columns:1fr}}.feature-card{cursor:pointer;flex-direction:column;align-items:flex-start;gap:1.5rem;padding:2rem;display:flex}.feature-card h3{margin:0;font-size:1.4rem}.feature-card p{font-size:1rem;line-height:1.6}.feature-icon-wrapper{color:#fff;background:linear-gradient(135deg,#3b82f61a,#ec48991a);border:1px solid #ffffff0d;border-radius:20px;justify-content:center;align-items:center;padding:1.25rem;transition:all .4s;display:flex}.feature-card:hover .feature-icon-wrapper{background:linear-gradient(135deg, var(--primary-color), var(--secondary-color));transform:scale(1.1)rotate(5deg);box-shadow:0 10px 20px #ec48994d}.input-group{flex-direction:column;gap:.75rem;margin-bottom:2rem;display:flex}.input-group label{color:var(--text-primary);font-size:.95rem;font-weight:500}input,textarea,select{border:1px solid var(--border-color);width:100%;color:var(--text-primary);background:#0003;border-radius:16px;outline:none;padding:1.2rem;font-family:inherit;font-size:1rem;transition:all .3s;box-shadow:inset 0 2px 4px #0000001a}input:focus,textarea:focus,select:focus{border-color:var(--primary-color);background:#0006;box-shadow:inset 0 2px 4px #0000001a,0 0 0 3px #3b82f633}.btn{background:linear-gradient(135deg, var(--primary-color), var(--tertiary-color));color:#fff;cursor:pointer;border:none;border-radius:16px;justify-content:center;align-items:center;gap:.75rem;padding:1rem 2rem;font-size:1rem;font-weight:600;transition:all .3s cubic-bezier(.4,0,.2,1);display:flex;position:relative;overflow:hidden;box-shadow:0 4px 15px #3b82f64d}.btn:after{content:"";background:linear-gradient(90deg,#0000,#fff3,#0000);width:50%;height:100%;transition:all .5s;position:absolute;top:0;left:-100%;transform:skew(-20deg)}.btn:hover:after{left:150%}.btn:hover{transform:translateY(-3px);box-shadow:0 8px 25px #8b5cf680}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.7;cursor:not-allowed;transform:none}.btn-outline{border:1px solid var(--border-color);color:var(--text-primary);box-shadow:none;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#ffffff08}.btn-outline:hover{background:#ffffff1a;border-color:#fff3;box-shadow:0 4px 15px #0003}.chat-container{flex-direction:column;height:650px;padding:1.5rem;display:flex}.chat-messages{flex-direction:column;flex:1;gap:1.5rem;padding:1rem;display:flex;overflow-y:auto}.message{border-radius:20px;max-width:75%;padding:1.2rem 1.5rem;font-size:1.05rem;line-height:1.6;animation:.4s ease-out forwards fadeIn}.message.user{background:linear-gradient(135deg, var(--primary-color), var(--tertiary-color));border-bottom-right-radius:4px;align-self:flex-end;box-shadow:0 4px 15px #3b82f633}.message.ai{border:1px solid var(--border-color);background:#1e293be6;border-bottom-left-radius:4px;align-self:flex-start;box-shadow:0 4px 15px #0000001a}.message.ai h1,.message.ai h2,.message.ai h3{color:var(--text-primary);margin:1rem 0 .5rem}.message.ai p{margin-bottom:.75rem}.message.ai p:last-child{margin-bottom:0}.message.ai ul,.message.ai ol{margin-bottom:1rem;padding-left:1.5rem}.message.ai li{margin-bottom:.4rem}.message.ai strong{color:var(--secondary-color)}.message.ai hr{border:none;border-top:1px solid var(--border-color);margin:1rem 0}.speak-btn,.speak-btn-small,.speak-btn-card{color:var(--secondary-color);cursor:pointer;background:#ffffff1a;border:1px solid #fff3;border-radius:50%;justify-content:center;align-items:center;transition:all .2s;display:flex}.speak-btn:hover,.speak-btn-small:hover,.speak-btn-card:hover{background:var(--primary-color);color:#fff;transform:scale(1.1)}.speak-btn{width:36px;height:36px}.speak-btn-small{width:28px;height:28px;position:absolute;bottom:-5px;right:-5px}.speak-btn-card{z-index:10;width:32px;height:32px;position:absolute;top:1rem;right:1rem}.chat-input-area{border-top:1px solid var(--border-color);gap:1rem;margin-top:.5rem;padding-top:1.5rem;display:flex}@keyframes fadeIn{0%{opacity:0;transform:translateY(15px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:.6s cubic-bezier(.2,.8,.2,1) forwards fadeIn}.delay-1{opacity:0;animation-delay:.1s}.delay-2{opacity:0;animation-delay:.2s}.delay-3{opacity:0;animation-delay:.3s}.delay-4{opacity:0;animation-delay:.4s}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.animate-spin{animation:1s linear infinite spin}.settings-panel{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:1000;opacity:0;pointer-events:none;background:#0009;justify-content:center;align-items:center;transition:opacity .4s;display:flex;position:fixed;inset:0}.settings-panel.active{opacity:1;pointer-events:all}.settings-card{width:100%;max-width:550px;transition:all .4s cubic-bezier(.175,.885,.32,1.275);transform:scale(.9)translateY(20px)}.settings-panel.active .settings-card{transform:scale(1)translateY(0)}.flashcard-container{perspective:1500px;cursor:pointer;width:100%;height:320px}.flashcard{width:100%;height:100%;transform-style:preserve-3d;transition:transform .8s cubic-bezier(.175,.885,.32,1.275);position:relative}.flashcard.flipped{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{backface-visibility:hidden;text-align:center;border-radius:24px;flex-direction:column;justify-content:center;align-items:center;width:100%;height:100%;padding:2rem;display:flex;position:absolute;box-shadow:0 10px 30px -5px #0000004d}.flashcard-front{background:linear-gradient(135deg,#1e293be6,#0f172af2);border:1px solid #ffffff1a}.flashcard-back{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:linear-gradient(135deg,#ec489933,#8b5cf633);border:1px solid #ec489966;transform:rotateY(180deg)}.word-hanzi{background:linear-gradient(135deg, var(--secondary-color), var(--primary-color));-webkit-text-fill-color:transparent;filter:drop-shadow(0 4px 8px #0003);-webkit-background-clip:text;background-clip:text;margin-bottom:.5rem;font-size:4.5rem;font-weight:800}.word-pinyin{color:var(--text-primary);letter-spacing:.05em;font-size:1.5rem;font-weight:500}.word-meaning{color:#fff;margin-bottom:1.5rem;font-size:1.8rem;font-weight:700}.word-example{color:var(--text-secondary);font-size:1.1rem;font-style:italic;line-height:1.6}.vocab-grid{grid-template-columns:repeat(4,1fr);gap:2rem;margin-top:2rem;display:grid}@media (width<=1200px){.vocab-grid{grid-template-columns:repeat(2,1fr)}}@media (width<=600px){.vocab-grid{grid-template-columns:1fr}}@media (width<=768px){.app-container{padding:1rem}.header{flex-direction:column;align-items:flex-start;gap:1rem;margin-bottom:1.5rem}h1{font-size:2rem}.glass-card{border-radius:16px;padding:1.25rem}.feature-grid{grid-template-columns:1fr;gap:1.5rem}.feature-card{padding:1.5rem}.chat-container{height:70vh;padding:1rem}.message{max-width:90%;padding:1rem;font-size:1rem}.chat-input-area form{flex-direction:column;width:100%;display:flex}.word-hanzi{font-size:3.5rem}.flashcard-container{height:280px}}