:root{--primary-color: #0056b3;--secondary-color: #007bff;--dark-color: #343a40;--light-gray-color: #f8f9fa;--white-color: #ffffff;--text-color: #495057;--font-family: "Noto Sans TC", sans-serif;--border-radius: 8px;--box-shadow: 0 4px 6px rgba(0, 0, 0, .1)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);line-height:1.6;color:var(--text-color);background-color:var(--white-color)}a{text-decoration:none;color:var(--primary-color);transition:color .3s ease}a:hover{color:var(--secondary-color)}img{max-width:100%;height:auto;display:block}.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}.app-header{background:var(--white-color);padding:1rem 0;position:sticky;top:0;z-index:1000;box-shadow:var(--box-shadow)}.header-container{display:flex;justify-content:space-between;align-items:center}.logo-container{display:flex;align-items:center;gap:1rem}.logo-container img{height:40px}.logo-container h1{font-size:1.5rem;color:var(--primary-color);margin:0}.navbar{display:flex;align-items:center}.nav-list{list-style:none;display:flex;gap:1.5rem}.nav-item{position:relative}.nav-link{color:var(--dark-color);font-weight:700;padding:.5rem 0;position:relative}.nav-link:after{content:"";position:absolute;bottom:0;left:0;width:0;height:2px;background-color:var(--primary-color);transition:width .3s ease}.nav-link:hover:after,.nav-item:hover>.nav-link:after{width:100%}.dropdown-content{display:none;position:absolute;top:100%;left:0;background:var(--white-color);box-shadow:var(--box-shadow);border-radius:var(--border-radius);list-style:none;min-width:200px;padding:.5rem 0;opacity:0;transform:translateY(10px);transition:opacity .3s ease,transform .3s ease}.nav-item:hover .dropdown-content{display:block;opacity:1;transform:translateY(0)}.dropdown-link{display:block;padding:.75rem 1.5rem;color:var(--dark-color);white-space:nowrap}.dropdown-link:hover{background-color:var(--light-gray-color)}.menu-toggle{display:none;background:none;border:none;padding:10px;cursor:pointer;z-index:1100;position:relative;width:40px;height:40px}.hamburger-box{display:inline-block;position:relative;width:24px;height:20px}.hamburger-inner,.hamburger-inner:before,.hamburger-inner:after{width:24px;height:3px;background-color:var(--dark-color);border-radius:4px;position:absolute;transition:transform .15s ease,top .15s ease,bottom .15s ease,opacity .15s ease;left:0}.hamburger-inner{top:50%;transform:translateY(-50%)}.hamburger-inner:before,.hamburger-inner:after{content:""}.hamburger-inner:before{top:-8px}.hamburger-inner:after{bottom:-8px}.menu-toggle.is-active .hamburger-inner{transform:rotate(45deg)}.menu-toggle.is-active .hamburger-inner:before{top:0;opacity:0}.menu-toggle.is-active .hamburger-inner:after{bottom:0;transform:rotate(-90deg)}.menu-overlay{display:none;position:fixed;top:0;left:0;width:100vw;height:100vh;background:#00000080;z-index:1040;opacity:0;transition:opacity .3s ease}.menu-overlay.is-open{display:block;opacity:1}.hero{position:relative;height:60vh;color:var(--white-color);display:flex;align-items:center;justify-content:center;text-align:center;overflow:hidden}.hero-slide{position:absolute;top:0;left:0;width:100%;height:100%;background-size:cover;background-position:center;opacity:0;transition:opacity 1s ease-in-out;will-change:opacity}.hero-slide.active{opacity:1}.hero:before{content:"";position:absolute;top:0;left:0;width:100%;height:100%;background:#00000080;z-index:1}.hero-content{position:relative;z-index:2;max-width:800px;padding:2rem;animation:fadeInDown 1s ease-out}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}.hero h2{font-size:2.5rem;margin-bottom:1rem}.hero h3{font-size:1.5rem;margin-bottom:1rem;font-weight:400;color:#cecdcd}.hero p{font-size:1.2rem;margin-bottom:1.5rem;color:#cecdcd}.hero-keywords{font-size:1.3rem;font-weight:400;letter-spacing:2px;color:#e0e0e0}.section{padding:4rem 0}.section-light{background-color:var(--light-gray-color)}.section-title{text-align:center;font-size:2.2rem;color:var(--primary-color);margin-bottom:3rem}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:2rem}.feature-card{position:relative;display:flex;align-items:center;justify-content:center;min-height:280px;border-radius:var(--border-radius);box-shadow:var(--box-shadow);color:var(--white-color);text-decoration:none;overflow:hidden;transition:transform .3s ease,box-shadow .3s ease}.feature-card:hover{transform:translateY(-10px);box-shadow:0 8px 12px #0003}.feature-card h3{position:relative;z-index:1;font-size:1.8rem;text-shadow:2px 2px 4px rgba(0,0,0,.3);color:var(--white-color);text-align:center}.feature-practice{background-image:linear-gradient(45deg,#8e2de2,#4a00e0)}.feature-challenge{background-image:linear-gradient(45deg,#ff512f,#dd2476)}.feature-textbooks{background-image:linear-gradient(45deg,#2193b0,#6dd5ed)}.feature-taoyuan{background-image:linear-gradient(45deg,#11998e,#38ef7d)}.feature-card h3 .text-chinese,.feature-card h3 .text-english{transition:opacity .3s ease-in-out}.feature-card h3 .text-english{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);opacity:0;width:100%}.feature-card:hover h3 .text-chinese{opacity:0}.feature-card:hover h3 .text-english{opacity:1}.quote-banner{background-image:url(https://images.unsplash.com/photo-1481627834876-b7833e8f5570?q=80&w=1856&auto=format&fit=crop);background-size:cover;background-position:center;background-attachment:fixed;padding:5rem 1rem;text-align:center;position:relative;color:var(--white-color);display:flex;align-items:center;justify-content:center;min-height:300px}.quote-banner:before{content:"";position:absolute;top:0;left:0;width:100%;height:100%;background:#0057b354;z-index:1}.quote-text p:before,.quote-text p:after{font-size:3rem;vertical-align:middle;color:#fff9;font-family:serif}.quote-text p:before{content:"“";margin-right:.25em}.quote-text p:after{content:"”";margin-left:.25em}.quote-text{animation:fadeIn 1.5s ease-out;position:relative;z-index:2;max-width:800px;margin:0 auto;font-family:Georgia,serif;font-style:italic;font-size:1.75rem;line-height:1.8}.quote-text footer{margin-top:1.5rem;font-size:1.1rem;font-style:normal;font-weight:700;color:#dce9f9}.materials-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem}.material-category{background:var(--white-color);padding:2rem;border-radius:var(--border-radius);border:1px solid #e0e0e0}.material-category h3{font-size:1.5rem;color:var(--primary-color);border-bottom:2px solid var(--primary-color);padding-bottom:.5rem;margin-bottom:1.5rem}.material-list{list-style:none}.material-item a{display:block;padding:.75rem 1rem;margin-bottom:.5rem;background-color:var(--light-gray-color);border-radius:5px;transition:background-color .3s,transform .3s}.material-item a:hover{background-color:var(--secondary-color);color:var(--white-color);transform:translate(5px)}.partners-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:2.5rem;align-items:center;justify-items:center;text-align:center}.partner-item img{height:60px;width:auto;object-fit:contain;margin:0 auto 1rem;filter:grayscale(100%);transition:filter .3s ease}.partner-item:hover img{filter:grayscale(0%)}.partner-item h4{font-size:1rem;font-weight:700}.app-footer{background-color:var(--dark-color);color:var(--light-gray-color);padding:3rem 0}.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:2rem}.footer-col h4{font-size:1.2rem;color:var(--white-color);margin-bottom:1rem;border-bottom:1px solid var(--secondary-color);padding-bottom:.5rem;display:inline-block}.footer-col ul{list-style:none}.footer-col li{margin-bottom:.5rem}.footer-col a{color:var(--light-gray-color)}.footer-col a:hover{color:var(--white-color);text-decoration:underline}.footer-logos{display:flex;gap:1rem;align-items:center;margin-top:1rem}.footer-logos img{height:40px;background:#fff;padding:5px;border-radius:5px}.footer-bottom{text-align:center;margin-top:2rem;padding-top:2rem;border-top:1px solid #4a5158}.vocabulary-page-main{padding:2rem 0;background-color:var(--light-gray-color);min-height:calc(100vh - 250px)}.top-controls{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem;flex-wrap:wrap;gap:1rem}.back-button{display:inline-flex;align-items:center;gap:.5rem;padding:.5rem 1rem;background-color:var(--white-color);color:var(--dark-color);border:1px solid #ddd;border-radius:var(--border-radius);font-size:1rem;cursor:pointer;transition:all .3s ease;box-shadow:0 1px 2px #0000000d}.back-button:hover{background-color:#e9ecef;border-color:#ccc;transform:translateY(-2px);box-shadow:var(--box-shadow)}.iframe-wrapper{position:relative;width:100%;height:80vh;border-radius:var(--border-radius);overflow:hidden;box-shadow:var(--box-shadow);border:1px solid #ddd}.content-iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:0;transform-origin:top left}.zoom-controls{display:flex;align-items:center;gap:.5rem}.zoom-button{background-color:var(--primary-color);border:none;color:#fff;width:36px;height:36px;font-size:1.2rem;border-radius:50%;cursor:pointer;transition:background-color .3s ease,transform .3s ease;display:flex;justify-content:center;align-items:center;-webkit-user-select:none;user-select:none}.zoom-button:hover{background-color:var(--secondary-color);transform:scale(1.1)}.zoom-scale{font-weight:600;color:var(--dark-color);min-width:90px;text-align:center;font-size:.9rem;cursor:pointer}.gept-page-main{padding:2rem 0;background-color:#f4f7fc;min-height:calc(100vh - 250px)}.gept-page-title{font-size:2rem;color:var(--primary-color);text-align:center;margin-bottom:2rem}.gept-tabs{display:flex;justify-content:center;gap:.5rem;margin-bottom:2rem;flex-wrap:wrap;border-bottom:1px solid #ddd}.gept-tab-button{padding:.75rem 1.5rem;font-size:1rem;font-weight:700;border:none;border-bottom:3px solid transparent;background-color:transparent;color:var(--text-color);cursor:pointer;transition:all .3s ease;margin-bottom:-1px}.gept-tab-button:hover{color:var(--primary-color)}.gept-tab-button.active{color:var(--primary-color);border-bottom-color:var(--primary-color)}.gept-tab-content{background-color:var(--white-color);padding:2rem;border-radius:var(--border-radius);box-shadow:0 1px 3px #0000000d}.gept-video-player{display:flex;flex-direction:column;gap:2rem}.video-container{position:relative;padding-top:56.25%;background-color:#000;border-radius:var(--border-radius);overflow:hidden;box-shadow:var(--box-shadow)}.video-container video{position:absolute;top:0;left:0;width:100%;height:100%}.episode-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:1rem}.episode-button{padding:.75rem;font-size:1rem;background-color:var(--light-gray-color);border:1px solid #ddd;border-radius:var(--border-radius);cursor:pointer;transition:all .2s ease-in-out;color:var(--text-color);font-weight:500}.episode-button:hover{background-color:#e2e6ea;border-color:#b1b9c2;transform:translateY(-2px);box-shadow:0 2px 4px #00000014}.episode-button.active{background-color:var(--primary-color);color:var(--white-color);border-color:var(--primary-color);font-weight:700;box-shadow:0 4px 8px #0056b34d;transform:translateY(-2px)}@media (max-width: 992px){.menu-toggle{display:block}.nav-list{position:fixed;top:0;right:0;width:300px;max-width:80vw;height:100vh;background:var(--white-color);box-shadow:-5px 0 15px #0000001a;z-index:1050;list-style:none;padding:60px 0 20px;margin:0;display:flex;flex-direction:column;gap:0;transform:translate(100%);transition:transform .3s cubic-bezier(.23,1,.32,1);overflow-y:auto}.nav-list.is-open{transform:translate(0)}.nav-item{border-bottom:1px solid var(--light-gray-color);width:100%;position:static}.nav-item:hover .dropdown-content{display:block}.nav-link{display:block;padding:1rem 1.5rem}.nav-link:hover,.nav-link:hover:after{background-color:var(--light-gray-color);width:auto}.nav-link:after{display:none}.dropdown-content{display:block;position:static;background:#f1f5f9;box-shadow:none;border-radius:0;min-width:auto;padding:0;opacity:1;transform:none;transition:none;border-top:1px solid #e0e0e0}.dropdown-link{padding-left:2.5rem;white-space:normal}.hero h2{font-size:2rem}}@media (max-width: 768px){.materials-grid{grid-template-columns:1fr}.header-container{flex-direction:row;gap:1rem;justify-content:space-between}.quote-text{font-size:1.5rem}}