@import url(https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap);:root{--primary-color:#bf9b63;--primary-dark:#a88755;--text-color:#333;--background-light:#f8f6f2;--card-background:#fff;--grey-light:#e5e5e5;--grey-dark:grey;--success:#48bb78;--error:#e53e3e;--warning:#ed8936;--info:#4299e1}*{box-sizing:border-box;margin:0;padding:0}body{background-color:#f8f6f2;background-color:var(--background-light);color:#333;color:var(--text-color);font-family:Poppins,sans-serif;line-height:1.6}@keyframes rotate{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}.loading-screen{align-items:center;background-color:#f8f6f2;background-color:var(--background-light);display:flex;flex-direction:column;height:100vh;justify-content:center}.logo-container{margin-bottom:20px}.logo.animated{animation:pulse 2s infinite}.loading-text{color:#bf9b63;color:var(--primary-color);font-size:18px;position:relative}.loading-text:after{animation:ellipsis 1.5s infinite;content:"...";height:1em;position:absolute;width:1em}@keyframes ellipsis{0%{content:"."}33%{content:".."}66%{content:"..."}}.login-page{background-color:#f8f6f2;background-color:var(--background-light);display:flex;flex-direction:column;min-height:100vh}.header{align-items:center;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background-color:#fff;background-color:var(--card-background);box-shadow:0 2px 10px #0000001a;display:flex;justify-content:space-between;padding:1rem 2rem;position:sticky;top:0;z-index:100}.logo{height:50px;transition:transform .3s ease;width:auto}.logo:hover{transform:scale(1.05)}.content-section{margin-top:1rem;padding:2rem}.main-content{display:flex;flex-direction:column}.content-container{align-items:flex-start;display:flex;flex-wrap:wrap;gap:4rem;justify-content:center;min-height:750px;padding:3rem 2rem}.left-panel{flex:0 0 450px;max-width:500px}.right-panel{display:flex;flex:0 0 600px;height:100%;max-width:650px}.hero-section{align-items:flex-start;background-color:initial;height:100%;justify-content:space-between;padding:0;position:relative}.hero-container,.hero-section{display:flex;flex-direction:column;width:100%}.hero-container{justify-content:center;z-index:1}.hero-content{display:flex;flex-direction:column;height:100%;width:100%}.hero-content h1{color:#bf9b63;color:var(--primary-color);font-size:3.2rem;font-weight:700;line-height:1.15;margin-bottom:1.5rem}.hero-content p{color:#333;color:var(--text-color);font-size:1.3rem;line-height:1.6;margin-bottom:2.5rem}.hero-buttons{display:flex;gap:1.5rem;justify-content:flex-start;margin-bottom:2.5rem}.hero-button{border-radius:8px;font-size:1.1rem;font-weight:600;padding:.9rem 1.75rem;text-decoration:none;transition:all .3s ease}.hero-button.primary-button{background-color:#bf9b63;background-color:var(--primary-color);border:2px solid #bf9b63;border:2px solid var(--primary-color);color:#fff}.hero-button.primary-button:hover{background-color:#a88755;background-color:var(--primary-dark);border-color:#a88755;border-color:var(--primary-dark);box-shadow:0 4px 12px #bf9b634d;transform:translateY(-2px)}.hero-button.secondary-button{background-color:initial;border:2px solid #bf9b63;border:2px solid var(--primary-color);color:#bf9b63;color:var(--primary-color)}.hero-button.secondary-button:hover{background-color:#bf9b631a;box-shadow:0 4px 12px #bf9b6333;transform:translateY(-2px)}.hero-image{display:flex;justify-content:flex-start;margin-bottom:0;margin-top:auto;max-width:100%;position:relative;z-index:1}.hero-image img{border-radius:12px;box-shadow:0 10px 30px #0000001a;display:block;height:auto;max-width:80%}@media (max-width:1200px){.hero-image img{max-width:75%}}@media (max-width:992px){.hero-buttons{justify-content:center;margin-bottom:2.5rem}.hero-image{justify-content:center;margin-bottom:.5rem}.hero-image img{max-width:65%}}@media (max-width:576px){.hero-image img{max-width:60%}}@keyframes slideInFromRight{0%{opacity:0;transform:translateX(50px)}to{opacity:1;transform:translateX(0)}}.features-section{background-color:#fff;padding:60px 10%;text-align:center}.features-section h2{color:#bf9b63;color:var(--primary-color);font-size:36px;margin-bottom:40px}.features-grid{grid-gap:30px;display:grid;gap:30px;grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}.feature-card{background-color:#f8f6f2;background-color:var(--background-light);border-radius:10px;box-shadow:0 5px 15px #0000000d;padding:30px;transition:all .3s ease}.feature-card:hover{box-shadow:0 15px 30px #0000001a;transform:translateY(-10px)}.feature-icon{color:#bf9b63;color:var(--primary-color);font-size:36px;margin-bottom:20px}.feature-card h3{color:#333;color:var(--text-color);font-size:22px;margin-bottom:15px}.feature-card p{color:grey;color:var(--grey-dark)}.login-form-container{background-color:#fff;background-color:var(--card-background);border-radius:12px;box-shadow:0 8px 30px #0000001a;max-width:450px;padding:3rem;transition:transform .3s ease,box-shadow .3s ease;width:100%}.login-form-container:hover{box-shadow:0 12px 35px #00000026;transform:translateY(-3px)}.form-title{font-weight:700;margin-bottom:.75rem}.form-subtitle{font-size:16px;margin-bottom:2rem}.error-message{align-items:flex-start;flex-direction:column;gap:8px}.error-message i{margin-right:8px}.error-message.region-error{background-color:#fff8e1;border-left:4px solid #ffb300;color:#e65100}.error-actions{display:flex;flex-direction:column;gap:8px;margin-top:8px;width:100%}.toggle-region-btn{background-color:#ffb300;border:none;border-radius:4px;color:#fff;cursor:pointer;font-size:14px;padding:8px 16px;transition:background-color .2s}.toggle-region-btn:hover{background-color:#ffa000}.download-app-btn{background-color:initial;border:1px solid #e65100;border-radius:4px;color:#e65100;display:inline-block;font-size:14px;padding:8px 16px;text-align:center;text-decoration:none;transition:all .2s}.download-app-btn:hover{background-color:#e65100;color:#fff}.server-selection{flex-direction:column;margin-bottom:25px;width:100%}.region-selector{border-radius:8px;box-shadow:0 2px 8px #00000014;display:flex;margin-bottom:10px;overflow:hidden;width:100%}.region-option{background-color:#f0f0f0;color:#666;cursor:pointer;flex:1 1;font-weight:500;padding:12px;text-align:center;transition:all .3s ease}.region-option.active{background-color:#bf9b63;background-color:var(--primary-color);color:#fff}.region-option:first-child{border-right:1px solid #0000000d}.region-hint{align-items:flex-start;background-color:#f8f6f2;border-radius:4px;color:#666;display:flex;font-size:12px;gap:8px;margin-bottom:15px;padding:10px}.region-hint i{color:#bf9b63;color:var(--primary-color);font-size:14px;margin-top:2px}.form-group{margin-bottom:20px}.form-group label{display:block}.input-with-icon i{left:12px;transition:color .3s ease}.input-with-icon input{background-color:#f8f6f2;background-color:var(--background-light);padding:12px 12px 12px 40px}.input-with-icon input:focus+i{color:#bf9b63;color:var(--primary-color)}.form-options{justify-content:flex-start;margin-bottom:20px}.remember-me input[type=checkbox]{cursor:pointer}.login-button{overflow:hidden;padding:14px;position:relative;width:100%}.login-button:disabled{opacity:.7}.login-button:after{background:#ffffff80;border-radius:100%;content:"";height:5px;left:50%;opacity:0;position:absolute;top:50%;transform:scale(1) translate(-50%);transform-origin:50% 50%;width:5px}.login-button:hover:after{animation:ripple 1s ease-out}.help-text{margin-top:24px}.download-app-link{align-items:center;border:1px solid #bf9b63;border:1px solid var(--primary-color);border-radius:20px;color:#bf9b63;color:var(--primary-color);display:inline-flex;gap:8px;margin-top:10px;padding:8px 16px;text-decoration:none;transition:all .3s ease}.download-app-link:hover{background-color:#bf9b63;background-color:var(--primary-color);color:#fff}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.login-form-container{animation:fadeIn .5s ease-out}.error-message{animation:fadeIn .3s ease-out}@media (prefers-color-scheme:dark){.region-option{background-color:#2a2a2a;color:#e0e0e0}.region-option.active{background-color:#bf9b63;background-color:var(--primary-color)}.region-hint{background-color:#bf9b631a;color:#e0e0e0}.error-message{background-color:#e53e3e1a}.error-message.region-error{background-color:#ffb3001a}}@media (max-width:768px){.login-form-container{padding:2rem}.form-title{font-size:24px}.form-subtitle{font-size:14px;margin-bottom:1.5rem}}@media (max-width:576px){.login-form-container{padding:1.5rem}.region-option{font-size:14px;padding:10px 8px}}.server-selection{gap:10px;margin-top:25px}.toggle-switch span{color:#666;margin:0 10px}.slider{background-color:#ccc}.help-text{color:#666;font-size:.9rem}.form-title{color:#bf9b63;color:var(--primary-color);font-size:28px;margin-bottom:10px;text-align:center}.form-subtitle{color:grey;color:var(--grey-dark);margin-bottom:30px;text-align:center}.error-message{background-color:#e53e3e1a;border-radius:6px;color:#e53e3e;color:var(--error);gap:10px}.login-form{gap:20px}.form-group,.login-form{display:flex;flex-direction:column}.form-group label{color:#333;color:var(--text-color);font-weight:500;margin-bottom:8px}.input-with-icon{position:relative}.input-with-icon i{color:grey;color:var(--grey-dark);left:15px;position:absolute;top:50%;transform:translateY(-50%)}.input-with-icon input{border:1px solid #e5e5e5;border:1px solid var(--grey-light);border-radius:6px;font-size:16px;padding:12px 15px 12px 45px;transition:all .3s ease;width:100%}.input-with-icon input:focus{border-color:#bf9b63;border-color:var(--primary-color);box-shadow:0 0 0 2px #bf9b6333;outline:none}.input-with-icon input::placeholder{color:#b0b0b0}.form-options{justify-content:space-between;margin-bottom:10px}.form-options,.remember-me{align-items:center;display:flex}.remember-me{gap:8px}.remember-me input[type=checkbox]{accent-color:#bf9b63;accent-color:var(--primary-color);height:16px;width:16px}.forgot-password{color:#bf9b63;color:var(--primary-color);font-size:14px;text-decoration:none}.forgot-password:hover{text-decoration:underline}.login-button{background-color:#bf9b63;background-color:var(--primary-color);border:none;border-radius:6px;color:#fff;cursor:pointer;font-size:16px;font-weight:600;padding:12px;transition:all .3s ease}.login-button:hover:not(:disabled){background-color:#a88755;background-color:var(--primary-dark);box-shadow:0 4px 8px #0000001a;transform:translateY(-2px)}.login-button:disabled{background-color:#e5e5e5;background-color:var(--grey-light);cursor:not-allowed}.server-selection{align-items:center;display:flex;gap:15px;justify-content:center;margin-top:20px}.server-selection p{color:grey;color:var(--grey-dark);font-size:14px}.toggle-switch{align-items:center;display:flex;gap:10px}.toggle-switch span{color:grey;color:var(--grey-dark);font-size:14px}.toggle-switch span.active{color:#bf9b63;color:var(--primary-color);font-weight:500}.switch{display:inline-block;height:24px;position:relative;width:50px}.switch input{height:0;opacity:0;width:0}.slider{background-color:#e5e5e5;background-color:var(--grey-light);bottom:0;cursor:pointer;left:0;right:0;top:0}.slider,.slider:before{position:absolute;transition:.4s}.slider:before{background-color:#fff;bottom:4px;content:"";height:16px;left:4px;width:16px}input:focus+.slider{box-shadow:0 0 1px var(--primary-color)}.help-text{color:grey;color:var(--grey-dark);font-size:14px;margin-top:20px;text-align:center}.courses-section{background-color:#f8f6f2;background-color:var(--background-light);padding:60px 10%;text-align:center}.courses-section h2{color:#bf9b63;color:var(--primary-color);font-size:36px;margin-bottom:40px}.courses-container{grid-gap:30px;display:grid;gap:30px;grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}.course-card{background-color:#fff;border-radius:15px;box-shadow:0 10px 30px #00000014;flex:1 1;max-width:380px;min-width:280px;overflow:hidden;padding:0;position:relative;transition:all .3s ease}.course-card.hovered{box-shadow:0 15px 35px #0000001f;transform:translateY(-10px)}.recommended-badge{background-color:#e63946;box-shadow:0 2px 4px #0003;color:#fff;font-size:14px;font-weight:700;letter-spacing:1px;padding:5px 40px;position:absolute;right:-35px;top:10px;transform:rotate(45deg);z-index:1}.card-header{background-color:#bf9b63;background-color:var(--primary-color);color:#fff;padding:25px;text-align:center}.card-header h3{font-size:24px;margin-bottom:15px}.price-container{align-items:baseline;display:flex;gap:5px;justify-content:center}.currency{font-size:24px;font-weight:500}.price{font-size:42px;font-weight:700}.card-body{padding:25px 0}.duration-tag{background-color:#bf9b631a;border-radius:20px;color:#bf9b63;color:var(--primary-color);display:inline-block;font-size:14px;margin:0 25px 20px;padding:5px 15px}.features-list{list-style:none;margin:0;padding:0 25px;text-align:left}.features-list li{align-items:flex-start;display:flex;gap:10px;margin-bottom:12px}.features-list li i{color:#bf9b63;color:var(--primary-color);margin-top:3px}.features-list li.highlight{color:#bf9b63;color:var(--primary-color);font-weight:500}.card-footer{border-top:1px solid #e5e5e5;border-top:1px solid var(--grey-light);padding:20px 25px;text-align:center}.question-bank-section{background-color:#fff;padding:60px 10%;text-align:center}.question-bank-section h2{color:#bf9b63;color:var(--primary-color);font-size:36px;margin-bottom:20px}.question-bank-section p{color:grey;color:var(--grey-dark);margin:0 auto 40px;max-width:800px}.question-bank-features{grid-gap:30px;display:grid;gap:30px;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));margin-top:40px}.feature-item{background-color:#f8f6f2;background-color:var(--background-light);border-radius:10px;padding:30px;transition:all .3s ease}.feature-item:hover{box-shadow:0 10px 20px #0000000d;transform:translateY(-5px)}.feature-item .feature-icon{color:#bf9b63;color:var(--primary-color);font-size:36px;margin-bottom:15px}.feature-item h3{color:#333;color:var(--text-color);font-size:20px;margin-bottom:10px}.feature-item p{color:grey;color:var(--grey-dark);font-size:14px;margin:0}.testimonials-section{background-color:#f8f6f2;background-color:var(--background-light);padding:60px 10%;text-align:center}.testimonials-section h2{color:#bf9b63;color:var(--primary-color);font-size:36px;margin-bottom:40px}.testimonials-carousel{margin-bottom:20px}.carousel-btn,.testimonials-carousel{align-items:center;display:flex;justify-content:center}.carousel-btn{background-color:#fff;border:none;border-radius:50%;box-shadow:0 4px 8px #0000001a;cursor:pointer;height:40px;transition:all .3s ease;width:40px}.carousel-btn:hover{background-color:#bf9b63;background-color:var(--primary-color);color:#fff}.testimonial-card{align-items:center;background-color:#fff;border-radius:10px;box-shadow:0 10px 20px #0000000d;display:flex;gap:20px;margin:0 20px;max-width:700px;padding:30px}.testimonial-avatar{border-radius:50%;flex-shrink:0;height:80px;overflow:hidden;width:80px}.testimonial-avatar img{height:100%;object-fit:cover;width:100%}.testimonial-content{text-align:left}.testimonial-text{color:#333;color:var(--text-color);font-style:italic;margin-bottom:15px}.testimonial-author h4{color:#bf9b63;color:var(--primary-color);font-size:18px;margin-bottom:5px}.testimonial-author p{color:grey;color:var(--grey-dark);font-size:14px}.carousel-indicators{display:flex;gap:10px;justify-content:center}.indicator{background-color:#e5e5e5;background-color:var(--grey-light);border:none;border-radius:50%;cursor:pointer;height:10px;width:10px}.indicator.active{background-color:#bf9b63;background-color:var(--primary-color)}.download-section{background-color:#fff;padding:60px 10%;text-align:center}.download-section h2{color:#bf9b63;color:var(--primary-color);font-size:36px;margin-bottom:20px}.download-section p{color:grey;color:var(--grey-dark);margin:0 auto 40px;max-width:800px}.app-showcase{margin-bottom:60px;width:100%}.app-screenshots,.app-showcase{display:flex;justify-content:center}.app-screenshots{flex-wrap:wrap;gap:20px;margin:0 auto;max-width:1200px}.screenshot{border-radius:12px;box-shadow:0 8px 24px #00000026;height:360px;object-fit:cover;transition:transform .3s ease,box-shadow .3s ease;width:180px}.screenshot:hover{box-shadow:0 12px 30px #0003;transform:translateY(-5px)}.download-options{gap:60px;margin:40px auto;max-width:1200px}.download-platform{background-color:#f8f9fa;border-radius:16px;box-shadow:0 5px 20px #00000014;max-width:580px;padding:30px;transition:transform .3s ease,box-shadow .3s ease;width:100%}.download-platform:hover{box-shadow:0 8px 30px #0000001f;transform:translateY(-5px)}.download-platform h3{font-size:28px;font-weight:600;margin-bottom:25px;text-align:center}.download-versions-container{display:flex;flex-wrap:wrap;gap:30px;justify-content:space-around}.download-version{align-items:center;display:flex;flex-direction:column;width:220px}.download-button{background-color:#333;border-radius:10px;box-shadow:0 4px 10px #0000001a;justify-content:center;max-width:220px;padding:14px 20px;width:100%}.download-button:hover{background-color:#111;box-shadow:0 6px 15px #0003;transform:translateY(-3px)}.download-button.china{background-color:#b19b61}.download-button.china:hover{background-color:#8d7947}.download-button i{flex-shrink:0;font-size:28px;margin-right:12px}.button-text{flex-grow:1;text-align:center}.small-text{font-weight:400;margin-bottom:2px;opacity:.9}.large-text{font-size:15px;line-height:1.3}.qr-code-placeholder{align-items:center;display:flex;flex-direction:column;margin-top:20px;width:100%}.qr-code-image{align-items:center;background-color:#f5f5f5;border:1px solid #ddd;border-radius:10px;box-shadow:0 4px 8px #0000000f;display:flex;height:150px;justify-content:center;margin-bottom:8px;transition:transform .3s ease;width:150px}.qr-code-image:hover{transform:scale(1.05)}.qr-code-text{color:#666;font-size:14px;margin-top:8px}@media (max-width:1200px){.download-options{padding:0 20px}}@media (max-width:992px){.download-platform{max-width:100%}.download-versions-container{gap:40px}}@media (max-width:768px){.screenshot{height:300px;width:150px}.download-options{align-items:center;flex-direction:column;gap:40px}.download-platform{margin-bottom:20px;padding:25px 20px}.download-versions-container{gap:30px}}@media (max-width:480px){.app-screenshots{gap:10px}.screenshot{height:260px;width:130px}.download-versions-container{align-items:center;flex-direction:column}.download-version{margin-bottom:30px}}.app-features{display:flex;flex:1 1;flex-direction:column;gap:20px;justify-content:center;min-width:300px;text-align:left}.app-feature{display:flex;gap:15px}.app-feature i{color:#bf9b63;color:var(--primary-color);font-size:24px}.app-feature h3{color:#333;color:var(--text-color);font-size:18px;margin-bottom:5px}.app-feature p{color:grey;color:var(--grey-dark);font-size:14px;margin:0}.download-options{display:flex;flex-wrap:wrap;gap:30px;justify-content:center;margin-bottom:40px}.download-platform{background-color:#f8f6f2;background-color:var(--background-light);border-radius:10px;min-width:300px;padding:25px}.download-platform h3{color:#333;color:var(--text-color);font-size:20px;margin-bottom:15px}.download-buttons{display:flex;flex-wrap:wrap;gap:15px;justify-content:center}.download-button{align-items:center;background-color:#bf9b63;background-color:var(--primary-color);border-radius:6px;color:#fff;display:flex;gap:10px;min-width:180px;padding:12px 20px;text-decoration:none;transition:all .3s ease}.download-button:hover{background-color:#a88755;background-color:var(--primary-dark);box-shadow:0 4px 8px #0000001a;transform:translateY(-2px)}.download-button.china{background-color:#333;background-color:var(--text-color)}.download-button.china:hover{background-color:#222}.download-button i{font-size:24px}.button-text{display:flex;flex-direction:column}.small-text{font-size:12px;opacity:.8}.large-text{font-size:16px;font-weight:600}.video-container{margin:0 auto;max-width:800px;padding-top:56.25%;width:100%}.video-container iframe{border-radius:10px;box-shadow:0 10px 30px #0000001a;height:100%;left:0;position:absolute;top:0;width:100%}.footer{background-color:#333;background-color:var(--text-color);color:#fff;padding-top:60px}.footer-content{display:flex;flex-wrap:wrap;gap:30px;padding:0 10% 60px}.footer-section{flex:1 1;min-width:250px}.footer-section h3{color:#bf9b63;color:var(--primary-color);font-size:20px;margin-bottom:20px}.footer-section p{margin-bottom:15px;opacity:.8}.footer-section.about{max-width:400px}.social-links{display:flex;gap:15px;margin-top:20px}.social-links a{align-items:center;background-color:#ffffff1a;border-radius:50%;color:#fff;display:flex;height:40px;justify-content:center;transition:all .3s ease;width:40px}.social-links a:hover{background-color:#bf9b63;background-color:var(--primary-color);transform:translateY(-3px)}.footer-section.quick-links ul{list-style:none}.footer-section.quick-links a{color:#fff;display:block;margin-bottom:10px;opacity:.8;text-decoration:none;transition:all .3s ease}.footer-section.quick-links a:hover{color:#bf9b63;color:var(--primary-color);opacity:1;transform:translateX(5px)}.footer-section.contact p{align-items:center;display:flex;gap:10px}.footer-section.contact i{color:#bf9b63;color:var(--primary-color)}.footer-bottom{background-color:#0003;padding:20px 0;text-align:center}.footer-bottom p{font-size:14px;opacity:.8}.course-overview-page{display:flex;flex-direction:column;min-height:100vh}.dashboard-header{box-shadow:0 2px 10px #0000001a;padding:15px 30px}.search-container{width:300px}.search-input{background-color:#f8f6f2;background-color:var(--background-light);border:1px solid #e5e5e5;border:1px solid var(--grey-light);border-radius:20px;padding:10px 15px 10px 40px;transition:all .3s ease}.search-input:focus{box-shadow:0 0 0 2px #bf9b6333;outline:none}.search-icon{color:grey;color:var(--grey-dark);left:15px}.user-controls{gap:20px}.user-name{font-weight:500}.user-avatar{background-color:#bf9b63;background-color:var(--primary-color);color:#fff;height:36px;width:36px}.logout-button{background-color:initial;color:grey;color:var(--grey-dark);transition:all .3s ease}.logout-button:hover{color:#bf9b63;color:var(--primary-color)}.sidebar{background-color:#333;background-color:var(--text-color);color:#fff;display:flex;flex-direction:column;justify-content:space-between;padding:30px 0;width:250px}.sidebar-nav li{align-items:center;cursor:pointer;display:flex;gap:15px;padding:15px 25px;position:relative;transition:all .3s ease}.sidebar-nav li:hover{background-color:#ffffff1a}.sidebar-nav li.active{background-color:#bf9b63;background-color:var(--primary-color)}.sidebar-nav li.active:before{background-color:#fff;content:"";height:100%;left:0;position:absolute;top:0;width:4px}.sidebar-nav li i{font-size:18px}.mock-exam-button{padding:0 25px 30px}.mock-btn{align-items:center;background-color:#bf9b63;background-color:var(--primary-color);border-radius:6px;color:#fff;display:flex;font-weight:600;gap:10px;justify-content:center;padding:12px;text-decoration:none;transition:all .3s ease}.mock-btn:hover{background-color:#a88755;background-color:var(--primary-dark);box-shadow:0 4px 8px #0000001a;transform:translateY(-2px)}.main-content{background-color:#f8f6f2;background-color:var(--background-light);padding:2rem}.welcome-banner{border-radius:10px;box-shadow:0 5px 15px #0000000d;justify-content:space-between}.welcome-text{max-width:60%}.welcome-text h1{color:#bf9b63;color:var(--primary-color);font-size:28px;margin-bottom:10px}.welcome-text p{color:grey;color:var(--grey-dark)}.exam-countdown{background-color:#bf9b631a;border-radius:20px;color:#bf9b63;color:var(--primary-color);font-weight:500;padding:8px 15px}.welcome-image{max-width:35%}.welcome-image img{height:auto}.section-title{color:var(--text-color)}.category-title{color:#bf9b63;color:var(--primary-color)}.subjects-grid{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}.subject-card{border-radius:10px;box-shadow:0 5px 15px #0000000d;color:#333;color:var(--text-color);justify-content:space-between;padding:20px;transition:all .3s ease}.subject-card:hover{box-shadow:0 10px 25px #0000001a;transform:translateY(-5px)}.subject-icon{background-color:#bf9b631a;border-radius:10px;color:#bf9b63;color:var(--primary-color);font-size:24px;height:50px;width:50px}.subject-title{font-size:16px;margin-bottom:5px}.subject-description{font-size:12px}.subject-arrow,.subject-description{color:grey;color:var(--grey-dark)}.progress-stats{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));margin-top:20px}.stat-card{border-radius:10px;box-shadow:0 5px 15px #0000000d;transition:all .3s ease}.stat-card:hover{box-shadow:0 10px 25px #0000001a;transform:translateY(-5px)}.stat-icon{background-color:#bf9b631a;border-radius:10px;height:50px;width:50px}.stat-icon,.stat-value{color:#bf9b63;color:var(--primary-color);font-size:24px}.stat-value{display:block;margin-bottom:5px}.stat-label{color:grey;color:var(--grey-dark)}.loading-container{align-items:center;background-color:#f8f6f2;background-color:var(--background-light);display:flex;flex-direction:column;height:100vh;justify-content:center}.spinner{animation:spin 1s ease-in-out infinite;border:3px solid #bf9b634d;border-top:3px solid var(--primary-color);height:50px;margin-bottom:20px;width:50px}.language-switcher{display:inline-block;position:relative}.language-button{align-items:center;background-color:initial;border:1px solid #bf9b63;border:1px solid var(--primary-color);border-radius:8px;color:#bf9b63;color:var(--primary-color);cursor:pointer;display:flex;font-size:.9rem;gap:.5rem;padding:.5rem 1rem;transition:all .3s ease}.language-button:hover{background-color:#bf9b631a;transform:translateY(-2px)}.dropdown-arrow{font-size:.8rem;transition:transform .3s ease}.language-button:hover .dropdown-arrow{transform:translateY(2px)}.language-dropdown{background-color:#fff;background-color:var(--card-background);border:1px solid #e5e5e5;border:1px solid var(--grey-light);border-radius:8px;box-shadow:0 4px 12px #0000001a;margin-top:.5rem;min-width:120px;opacity:0;position:absolute;right:0;top:100%;transform:translateY(-10px);transition:all .3s ease;visibility:hidden;z-index:1000}.language-switcher:hover .language-dropdown{opacity:1;transform:translateY(0);visibility:visible}.language-option{background:none;border:none;color:#333;color:var(--text-color);cursor:pointer;display:block;font-size:.9rem;padding:.75rem 1rem;text-align:left;transition:all .3s ease;width:100%}.language-option.active,.language-option:hover{background-color:#bf9b631a;color:#bf9b63;color:var(--primary-color)}.language-option.active{font-weight:500}@media (max-width:992px){.content-container{align-items:center;flex-direction:column;gap:2rem;padding:2rem 1rem}.left-panel,.right-panel{flex:0 0 100%;max-width:550px;width:100%}.hero-content h1{font-size:2.6rem;text-align:center}.hero-content p{font-size:1.15rem;text-align:center}.hero-buttons{justify-content:center;margin-bottom:2.5rem}.hero-image{justify-content:center;margin-bottom:.5rem}.hero-image img{max-width:65%}}@media (max-width:768px){.header{padding:10px 15px}.logo{height:40px}.hero-content h1{font-size:2rem;margin-bottom:1rem}.hero-content p{font-size:1.05rem;margin-bottom:2rem}.main-content{padding:1rem}.content-container{gap:1.5rem;margin:.5rem auto}.hero-section,.login-form-container{padding:1.5rem}}@media (max-width:576px){.content-container{gap:2rem;padding:1.5rem 1rem}.login-form-container{padding:2rem}.form-title{font-size:1.8rem}.form-subtitle{font-size:1rem;margin-bottom:2rem}.hero-content h1{font-size:2.2rem;margin-bottom:1rem}.hero-content p{font-size:1.05rem;margin-bottom:2rem}.hero-buttons{flex-direction:column;width:100%}.hero-button{text-align:center;width:100%}}@keyframes floatAnimation{0%{transform:translateY(0)}50%{transform:translateY(-10px)}to{transform:translateY(0)}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes zoomIn{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}.hero-image img{animation:floatAnimation 6s ease-in-out infinite}.course-card,.feature-card,.feature-item,.stat-card,.subject-card,.testimonial-card{animation:zoomIn .5s ease-out}.welcome-banner{animation:fadeInUp .5s ease-out}.page-transition-enter{opacity:0;transform:translateX(20px)}.page-transition-enter-active{transition:opacity .3s,transform .3s}.page-transition-enter-active,.page-transition-exit{opacity:1;transform:translateX(0)}.page-transition-exit-active{opacity:0;transform:translateX(-20px);transition:opacity .3s,transform .3s}.cta-button,.download-button,.login-button,.mock-btn{overflow:hidden;position:relative}.cta-button:after,.download-button:after,.login-button:after,.mock-btn:after{background:#ffffff80;border-radius:100%;content:"";height:5px;left:50%;opacity:0;position:absolute;top:50%;transform:scale(1) translate(-50%);transform-origin:50% 50%;width:5px}.cta-button:hover:after,.download-button:hover:after,.login-button:hover:after,.mock-btn:hover:after{animation:ripple 1s ease-out}@keyframes ripple{0%{opacity:.5;transform:scale(0)}20%{opacity:.3;transform:scale(25)}to{opacity:0;transform:scale(40)}}.collapsible-section{max-height:0;overflow:hidden;transition:max-height .3s ease-out}.collapsible-section.expanded{max-height:2000px;transition:max-height .5s ease-in}.scroll-fade{opacity:0;transform:translateY(20px);transition:opacity .6s ease-out,transform .6s ease-out}.scroll-fade.visible{opacity:1;transform:translateY(0)}.header.scrolled{background-color:#fffffff2;box-shadow:0 5px 15px #0000001a;transition:all .3s ease}.toggle-switch .slider{background-color:#e5e5e5;background-color:var(--grey-light);bottom:0;box-shadow:inset 0 1px 3px #0003;cursor:pointer;left:0;position:absolute;right:0;top:0;transition:.4s}.toggle-switch .slider:before{background-color:#fff;bottom:4px;box-shadow:0 2px 5px #0003;content:"";height:16px;left:4px;position:absolute;transition:.4s;width:16px}input:checked+.slider{background-color:#bf9b63;background-color:var(--primary-color)}input:focus+.slider{box-shadow:0 0 1px #bf9b63}input:checked+.slider:before{transform:translateX(26px)}.slider.round{border-radius:34px}.slider.round:before{border-radius:50%}@media (prefers-color-scheme:dark){:root{--background-light:#1a1a1a;--card-background:#2a2a2a;--text-color:#f0f0f0;--grey-light:#444;--grey-dark:#999}.course-card,.download-platform,.feature-card,.feature-item,.login-form-container,.stat-card,.subject-card,.testimonial-card,.welcome-banner{background-color:#fff;background-color:var(--card-background)}.search-input{background-color:#333;color:#f0f0f0}.download-section,.features-section,.header,.question-bank-section{background-color:#2a2a2a}.sidebar{background-color:#111}.login-button:disabled,.toggle-switch .slider{background-color:#444}input,select,textarea{background-color:#333;border-color:#444;color:#f0f0f0}input::placeholder,textarea::placeholder{color:#888}}.subject-arrow{font-size:20px}.locked{opacity:.7;pointer-events:none}.lock-icon{margin-left:8px}@media (max-width:768px){.subjects-list{grid-template-columns:1fr}.subject-item{margin-bottom:12px}}.subject-detail-view{margin:0 auto;max-width:1200px;padding:20px}.subject-detail-header{align-items:center;display:flex;margin-bottom:24px}.subject-title{font-size:24px;margin-left:12px}.loading-container{padding:40px 0;text-align:center}.loading-message{color:#777;font-size:14px;margin-top:20px}.study-cards-list{grid-gap:20px;display:grid;gap:20px;grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}.study-card-item{align-items:center;background-color:#fff;border-radius:8px;box-shadow:0 2px 8px #00000014;cursor:pointer;display:flex;justify-content:space-between;padding:16px;position:relative;transition:all .2s ease}.study-card-item:hover{box-shadow:0 4px 12px #0000001f;transform:translateY(-3px)}.study-card-item.completed{border-left:4px solid #4caf50}.card-content{flex:1 1}.card-title{font-size:18px;margin-bottom:8px}.card-details{display:flex;flex-wrap:wrap;gap:12px}.card-detail{align-items:center;color:#666;display:flex;font-size:14px}.card-detail i{margin-right:5px}.card-status{margin-left:12px}.completed-icon{color:#4caf50;font-size:20px}.incomplete-icon{color:#ccc;font-size:20px}.no-cards-message{color:#666;grid-column:1/-1;padding:40px 0;text-align:center}@media (max-width:768px){.study-cards-list{grid-template-columns:1fr}.card-details{flex-direction:column;gap:6px}}.study-card-container{margin:0 auto;max-width:1200px;padding:20px}.study-card-header{align-items:center;display:flex;margin-bottom:24px}.back-button{border-radius:4px;font-weight:600}.back-button:hover{background-color:#f5f5f5}.card-title{color:#333;font-size:24px;font-weight:600;margin:0 15px}.card-controls{display:flex;gap:12px}.settings-button{align-items:center;background:none;border:none;border-radius:50%;cursor:pointer;display:flex;font-size:20px;justify-content:center;padding:5px;transition:all .2s ease}.settings-button:hover{background-color:#f5f5f5}.video-container{border-radius:8px;box-shadow:0 2px 8px #0000001a;margin-bottom:24px;overflow:hidden;position:relative}.video-info{background-color:#f8f8f8;color:#666;display:flex;font-size:14px;justify-content:space-between;padding:12px}.alternative-video{margin-bottom:24px}.alternative-video h3{color:#555;font-size:18px;font-weight:600;margin-bottom:12px}.content-section{background-color:#fff;border-radius:8px;box-shadow:0 2px 8px #00000014;margin-bottom:30px;overflow:hidden}.section-header{align-items:center;background-color:#f8f8f8;border-bottom:1px solid #eee;display:flex;justify-content:space-between;padding:12px 16px}.section-header h3{color:#555;font-size:18px;font-weight:600;margin:0}.expand-button{align-items:center;background:none;border:none;border-radius:4px;cursor:pointer;display:flex;font-size:18px;justify-content:center;padding:5px;transition:background-color .2s ease}.expand-button:hover{background-color:#eee}.content-container{max-height:300px;overflow-y:auto;padding:16px}.completion-section{display:flex;justify-content:center;margin:30px 0}.completion-button{background-color:#f0f0f0;border:none;border-radius:6px;color:#666;font-size:16px;font-weight:600;padding:12px 24px;transition:all .2s ease}.completion-button:hover{background-color:#e0e0e0}.completion-button.completed{color:#4caf50}.completion-button.completed:hover{background-color:#d5ecd8}.settings-modal{align-items:center;background-color:#00000080;bottom:0;display:flex;justify-content:center;left:0;position:fixed;right:0;top:0;z-index:1000}.settings-content{background-color:#fff;border-radius:8px;box-shadow:0 4px 20px #00000026;max-width:400px;padding:24px;width:100%}.settings-content h3{color:#333;font-size:20px;font-weight:600;margin-bottom:20px;margin-top:0}.font-size-control{gap:16px;margin-bottom:24px}.font-size-control,.size-button{align-items:center;display:flex;justify-content:center}.size-button{background-color:#f8f8f8;border:1px solid #ddd;border-radius:50%;cursor:pointer;font-size:18px;height:40px;transition:all .2s ease;width:40px}.size-button:hover:not(:disabled){background-color:#eee}.size-button:disabled{cursor:not-allowed;opacity:.5}.current-size{color:#333;font-size:16px;min-width:50px;text-align:center}.close-settings{background-color:#f0f0f0;border:none;border-radius:6px;color:#555;cursor:pointer;font-size:16px;font-weight:600;padding:12px;transition:all .2s ease;width:100%}.close-settings:hover{background-color:#e0e0e0}.note-modal{align-items:center;background-color:#00000080;bottom:0;display:flex;justify-content:center;left:0;position:fixed;right:0;top:0;z-index:1000}.note-content{background-color:#fff;border-radius:8px;box-shadow:0 4px 20px #00000026;max-width:500px;padding:24px;width:100%}.note-content h3{color:#333;font-size:20px;font-weight:600;margin-bottom:20px;margin-top:0}.selected-text{margin-bottom:16px}.selected-text p{color:#555;font-weight:600;margin-bottom:8px}.text-preview{background-color:#f8f8f8;border:1px solid #eee;border-radius:4px;color:#666;font-size:14px;max-height:100px;overflow-y:auto;padding:12px}.note-content textarea{border:1px solid #ddd;border-radius:4px;font-size:16px;margin-bottom:20px;padding:12px;resize:vertical;width:100%}.note-actions{display:flex;gap:12px;justify-content:flex-end}.cancel-button,.save-button{border-radius:6px;cursor:pointer;font-size:16px;font-weight:600;padding:10px 20px;transition:all .2s ease}.cancel-button{background-color:#f0f0f0;border:none;color:#555}.cancel-button:hover{background-color:#e0e0e0}.save-button{background-color:#4285f4;border:none;color:#fff}.save-button:hover:not(:disabled){background-color:#3367d6}.save-button:disabled{cursor:not-allowed;opacity:.6}.fullscreen-modal{background-color:#fff;bottom:0;display:flex;flex-direction:column;left:0;position:fixed;right:0;top:0;z-index:1000}.fullscreen-header{align-items:center;background-color:#f8f8f8;border-bottom:1px solid #eee;display:flex;justify-content:space-between;padding:16px 24px}.fullscreen-header h3{color:#333;font-size:20px;font-weight:600;margin:0}.close-fullscreen{align-items:center;background:none;border:none;border-radius:50%;color:#555;cursor:pointer;display:flex;font-size:24px;justify-content:center;padding:8px;transition:background-color .2s ease}.close-fullscreen:hover{background-color:#eee}.fullscreen-body{flex:1 1;overflow-y:auto;padding:24px}.text-selection-menu{background-color:#fff;border-radius:8px;bottom:20px;box-shadow:0 2px 15px #0003;display:flex;left:50%;overflow:hidden;position:fixed;transform:translateX(-50%);z-index:900}.text-selection-menu button{background:none;border:none;color:#555;cursor:pointer;font-size:14px;font-weight:600;padding:10px 15px;transition:background-color .2s ease}.text-selection-menu button:hover{background-color:#f5f5f5}.text-selection-menu button:not(:last-child){border-right:1px solid #eee}@media (max-width:768px){.study-card-header{align-items:flex-start;flex-direction:column}.card-title{font-size:20px;margin:12px 0}.card-controls{align-self:flex-end}.font-size-control{gap:8px}.size-button{height:36px;width:36px}.note-content,.settings-content{width:90%}.text-selection-menu{flex-direction:column;width:90%}.text-selection-menu button:not(:last-child){border-bottom:1px solid #eee;border-right:none}}.video-player-container{border-radius:8px;overflow:hidden}.video-element{background-color:#000;cursor:pointer}.loader-spinner{animation:spin 1s linear infinite;border:4px solid #fff3;height:40px;width:40px}.video-error{padding:20px;text-align:center}.video-controls{justify-content:space-between;transition:opacity .3s ease}.control-button{transition:transform .2s ease}.control-button:hover{transform:scale(1.1)}.progress-container{margin:0 15px}.time-display{font-family:monospace;margin:0 10px;min-width:50px;text-align:center}.progress-bar{background-color:#ffffff4d;border-radius:5px;cursor:pointer}.progress-bar::-moz-range-thumb{background:#fff;border:none;border-radius:50%;cursor:pointer;height:15px;width:15px}.volume-container{margin-right:10px}.volume-slider{background-color:#ffffff4d;border-radius:5px;display:none;margin-left:5px;transition:width .2s ease}.volume-container:hover .volume-slider{display:block}.volume-slider::-moz-range-thumb{background:#fff;border:none;border-radius:50%;cursor:pointer;height:12px;width:12px}@media (max-width:768px){.video-controls{padding:5px}.control-button{font-size:16px;height:30px;width:30px}.time-display{font-size:12px;margin:0 5px;min-width:40px}.volume-container{margin-right:5px}.volume-slider{width:60px}}.html-content{background-color:#fff;background-color:var(--background-color,#fff);border-radius:4px;color:#333;color:var(--text-color,#333);line-height:1.6;overflow-y:auto}.content-inner,.html-content{margin:0;padding:0;position:relative;width:100%}.content-inner div,.content-inner h1,.content-inner h2,.content-inner h3,.content-inner h4,.content-inner h5,.content-inner h6,.content-inner li,.content-inner ol,.content-inner p,.content-inner span,.content-inner ul{margin-bottom:1em}.content-inner h1,.content-inner h2,.content-inner h3,.content-inner h4,.content-inner h5,.content-inner h6{font-weight:600;line-height:1.2;margin-bottom:.5em;margin-top:1.5em}.content-inner ol,.content-inner ul{margin-bottom:1em;padding-left:2em}.content-inner li{margin-bottom:.5em}.content-inner a{color:#06c;text-decoration:none}.content-inner a:hover{text-decoration:underline}.content-inner img{height:auto;margin:1em 0;max-width:100%}.content-inner table{border-collapse:collapse;margin:1em 0;width:100%}.content-inner td,.content-inner th{border:1px solid #ddd;padding:8px;text-align:left}.content-inner th{background-color:#f5f5f5;font-weight:600}.content-inner blockquote{border-left:4px solid #ddd;color:#666;margin-left:0;padding-left:1em}.content-inner code{font-family:monospace;font-size:.9em;padding:2px 4px}.content-inner code,.content-inner pre{background-color:#f0f0f0;border-radius:4px}.content-inner pre{margin:1em 0;overflow-x:auto;padding:1em}.content-inner pre code{background-color:initial;padding:0}@media (max-width:768px){.content-inner{padding:0}.content-inner h1,.content-inner h2,.content-inner h3,.content-inner h4,.content-inner h5,.content-inner h6{margin-top:1em}}@media (prefers-color-scheme:dark){.html-content{--background-color:#1c1c1e;--text-color:#e5e5ea}.content-inner a{color:#5ca8ff}.content-inner td,.content-inner th{border-color:#444}.content-inner th{background-color:#333}.content-inner blockquote{border-color:#444;color:#aaa}.content-inner code,.content-inner pre{background-color:#2a2a2a}}.loading-spinner-container{align-items:center;display:flex;flex-direction:column;height:100%;justify-content:center;min-height:150px;padding:30px;width:100%}.spinner{animation:spin 1s linear infinite;border:4px solid #0000001a;border-radius:50%;border-top-color:#4285f4;height:40px;margin-bottom:16px;width:40px}.loading-message{color:#666;font-size:16px;margin:0;text-align:center}@media (prefers-color-scheme:dark){.spinner{border-color:#5ca8ff #ffffff1a #ffffff1a}.loading-message{color:#aaa}}.dashboard{background-color:#f5f7fa;display:flex;flex-direction:column;min-height:100vh}.dashboard-header{align-items:center;background-color:#fff;box-shadow:0 1px 4px #0000001a;display:flex;height:60px;justify-content:space-between;padding:0 20px;z-index:10}.logo-container{align-items:center;display:flex;height:40px}.logo{height:100%;object-fit:contain}.search-container{max-width:500px;position:relative;width:40%}.search-input{background-color:#f8f8f8;font-size:14px;padding:10px 40px 10px 12px}.search-icon{color:#666;position:absolute;right:12px;top:50%;transform:translateY(-50%)}.user-controls{align-items:center;display:flex;gap:15px}.language-toggle{background:none;border:1px solid #ddd;border-radius:4px;color:#555;cursor:pointer;font-size:14px;padding:6px 12px;transition:all .2s ease}.language-toggle:hover{background-color:#f5f5f5}.user-info{align-items:center;display:flex;gap:10px}.user-name{color:#555;font-size:14px}.user-avatar{border-radius:50%;color:#666;height:32px;justify-content:center;width:32px}.logout-button,.user-avatar{align-items:center;background-color:#f0f0f0;display:flex}.logout-button{border:none;border-radius:4px;color:#555;cursor:pointer;font-size:14px;gap:8px;padding:8px 12px;transition:all .2s ease}.logout-button:hover{background-color:#e0e0e0}.dashboard-container{display:flex;flex:1 1}.sidebar{background-color:#fff;box-shadow:1px 0 4px #0000001a;width:240px;z-index:5}.sidebar-nav{padding:20px 0}.sidebar-nav ul{list-style:none;margin:0;padding:0}.sidebar-nav li{margin-bottom:5px}.sidebar-nav li a{align-items:center;color:#555;display:flex;font-size:16px;padding:12px 20px;text-decoration:none;transition:all .2s ease}.sidebar-nav li a:hover{background-color:#f5f5f5}.sidebar-nav li.active a{background-color:#e8f0fe;border-left:4px solid #4285f4;color:#4285f4;font-weight:600;padding-left:16px}.nav-icon{font-size:18px;margin-right:12px}.main-content{flex:1 1;overflow-y:auto;padding:20px}.welcome-banner{align-items:center;background-color:#fff;border-radius:8px;box-shadow:0 2px 8px #00000014;display:flex;margin-bottom:30px;padding:30px}.welcome-text{flex:3 1}.welcome-text h1{color:#333;font-size:24px;font-weight:600;margin-bottom:12px}.welcome-text p{color:#666;font-size:16px;margin-bottom:20px}.exam-countdown{align-items:center;background-color:#e8f0fe;border-radius:6px;color:#4285f4;display:flex;display:inline-flex;font-weight:600;gap:10px;padding:10px 15px}.calendar-icon{font-size:18px}.welcome-image{display:flex;flex:2 1;justify-content:center}.welcome-image img{max-height:200px;max-width:100%}.section-title{font-size:22px}.category-section{margin-bottom:30px}.category-title{border-bottom:2px solid #eee;color:#555;font-size:20px;font-weight:600;margin-bottom:15px;padding-bottom:8px}.subjects-grid{grid-gap:20px;display:grid;gap:20px;grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}.subject-card{align-items:center;background-color:#fff;border-radius:8px;box-shadow:0 2px 8px #00000014;color:inherit;cursor:pointer;display:flex;padding:16px;position:relative;text-decoration:none;transition:all .2s ease}.subject-card:hover{box-shadow:0 4px 12px #0000001f;transform:translateY(-3px)}.subject-card.locked{opacity:.7;pointer-events:none}.subject-icon{align-items:center;background-color:#f0f0f0;border-radius:50%;display:flex;font-size:20px;height:40px;justify-content:center;margin-right:15px;width:40px}.book-icon{color:#555}.subject-info{flex:1 1}.subject-title{font-size:17px;font-weight:600;margin-bottom:6px}.subject-description{color:#666;font-size:14px;margin:0}.lock-icon{font-size:18px}.lock-icon,.subject-arrow{color:#888;margin-left:12px}.subject-arrow{font-size:16px;font-weight:700}.no-subjects{background-color:#fff;border-radius:8px;box-shadow:0 2px 8px #00000014;color:#666;padding:40px 0;text-align:center}.progress-section{margin-top:30px}.progress-stats{grid-gap:20px;display:grid;gap:20px;grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}.stat-card{background-color:#fff;border-radius:8px;box-shadow:0 2px 8px #00000014;padding:20px}.stat-card,.stat-icon{align-items:center;display:flex}.stat-icon{background-color:#e8f0fe;border-radius:50%;color:#4285f4;font-size:20px;height:40px;justify-content:center;margin-right:15px;width:40px}.stat-info{flex:1 1}.stat-value{color:#333;font-size:22px;font-weight:700;margin-bottom:4px}.stat-label{font-size:14px}.error-message{background-color:#ffe6e6;border:1px solid #f99;padding:12px}.error-message button{color:#666;font-weight:700}.course-overview-container{margin:0 auto;max-width:1200px;padding:20px}.search-bar{margin-bottom:24px;position:relative}.search-input{border:1px solid #ddd;border-radius:6px;box-shadow:0 2px 4px #0000000d;font-size:16px;padding:12px 40px 12px 12px;width:100%}.subjects-list{grid-gap:20px;display:grid;gap:20px;grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}.subject-item{align-items:center;background-color:#fff;border-radius:8px;box-shadow:0 2px 8px #00000014;cursor:pointer;display:flex;justify-content:space-between;padding:16px;position:relative;transition:all .2s ease}.subject-item:hover{box-shadow:0 4px 12px #0000001f;transform:translateY(-3px)}.subject-name{color:#333;font-size:18px;font-weight:600;margin-bottom:8px}@media (max-width:1024px){.sidebar{width:200px}.welcome-banner{flex-direction:column;text-align:center}.welcome-text{margin-bottom:20px}}@media (max-width:768px){.dashboard-header{padding:0 10px}.search-container{width:30%}.user-name{display:none}.sidebar{width:70px}.sidebar-nav li a{justify-content:center;padding:15px 0}.nav-icon{font-size:20px;margin-right:0}.sidebar-nav li a span{display:none}.sidebar-nav li.active a{border-bottom:3px solid #4285f4;border-left:none;padding-left:0}.progress-stats,.subjects-grid,.subjects-list{grid-template-columns:1fr}.subject-item{margin-bottom:12px}}@media (max-width:480px){.dashboard-header{flex-wrap:wrap;height:auto;padding:10px}.logo-container{margin-bottom:10px;order:1}.search-container{margin-top:10px;order:3;width:100%}.user-controls{margin-left:auto;order:2}}@media (max-width:1200px){.content-container{gap:3rem;min-height:650px;padding:2.5rem 1.5rem}.hero-image img{max-width:75%}}@media (max-width:992px){.content-container{align-items:center;flex-direction:column;gap:3rem;min-height:auto;padding:2rem 1.5rem}.hero-buttons{justify-content:center;margin-bottom:2.5rem}.hero-image{justify-content:center;margin-bottom:.5rem}.hero-image img{max-width:65%}}.app-download-text{color:#b19b61;font-weight:500;text-decoration:none;transition:all .3s ease}.app-download-text:hover{color:#8d7947;text-decoration:underline}.app-download-button{align-items:center;background-color:#333;border-radius:10px;box-shadow:0 4px 10px #0000001a;color:#fff;display:flex;justify-content:center;max-width:220px;padding:14px 20px;text-decoration:none;transition:all .3s ease;width:100%}.app-download-button:hover{background-color:#111;box-shadow:0 6px 15px #0003;transform:translateY(-3px)}.app-download-button.china{background-color:#b19b61}.app-download-button.china:hover{background-color:#8d7947}.app-download-button i{flex-shrink:0;font-size:28px;margin-right:12px}.app-download-button .button-text{display:flex;flex-direction:column;flex-grow:1;text-align:center}.app-download-button .small-text{font-size:12px;font-weight:400;margin-bottom:2px;opacity:.9}.app-download-button .large-text{font-size:15px;font-weight:600;line-height:1.3}.best-value-badge{align-items:center;background-color:#8a2be2;box-shadow:0 2px 4px #0003;color:#fff;display:flex;font-size:18px;font-weight:700;justify-content:center;padding:8px 15px;position:absolute;right:0;top:0;transform:rotate(45deg) translateX(30px) translateY(-20px);width:140px;z-index:1}.course-card.best-value{border:none}.course-download-btn{background:linear-gradient(135deg,#bf9b63,#a88755);border:none;border-radius:8px;box-shadow:0 4px 10px #a887554d;color:#fff;cursor:pointer;display:block;font-size:16px;font-weight:600;overflow:hidden;padding:12px 20px;position:relative;text-align:center;transition:all .3s ease;width:100%}.course-download-btn:hover{background:linear-gradient(135deg,#a88755,#bf9b63);box-shadow:0 6px 12px #a8875566;transform:translateY(-2px)}.course-download-btn:active{box-shadow:0 2px 8px #a887554d;transform:translateY(1px)}.course-download-btn:after{background:#fff6;border-radius:100%;content:"";height:5px;left:50%;opacity:0;position:absolute;top:50%;transform:scale(1) translate(-50%);transform-origin:50% 50%;width:5px}.course-download-btn:hover:after{animation:ripple 1s ease-out}.course-preview-section{background-color:#f8f6f2;background-color:var(--background-light);padding:60px 10%;text-align:center}.course-preview-section h2{color:#bf9b63;color:var(--primary-color);font-size:36px;margin-bottom:40px}.video-grid{display:flex;flex-wrap:wrap;gap:30px;justify-content:center}.video-grid .video-container{border-radius:12px;box-shadow:0 10px 20px #0000001a;height:0;min-width:300px;overflow:hidden;padding-bottom:25.25%;position:relative;width:45%}.video-grid .video-container iframe{border:0;height:100%;left:0;position:absolute;top:0;width:100%}.more-btn{background-color:#bf9b63;background-color:var(--primary-color);border-radius:30px;color:#fff;display:inline-block;font-weight:500;margin-top:15px;padding:8px 20px;text-decoration:none;transition:all .3s ease}.more-btn:hover{background-color:#a88755;background-color:var(--primary-dark);box-shadow:0 4px 8px #0000001a;transform:translateY(-2px)}@media (max-width:768px){.video-grid .video-container{padding-bottom:56.25%;width:100%}}.video-tutorial{margin-top:40px;width:100%}.video-tutorial h3{color:#bf9b63;color:var(--primary-color);font-size:24px;margin-bottom:20px}.videos-container{display:flex;flex-wrap:wrap;gap:30px;justify-content:center;margin:0 auto}.video-wrapper{border-radius:12px;box-shadow:0 10px 20px #0000001a;height:0;min-width:300px;overflow:hidden;padding-bottom:25.3%;position:relative;width:45%}.video-wrapper iframe{border:0;height:100%;left:0;position:absolute;top:0;width:100%}@media (max-width:768px){.videos-container{align-items:center;flex-direction:column}.video-wrapper{margin-bottom:20px;padding-bottom:56.25%;width:100%}}.practice-selection-container{margin:0 auto;max-width:800px;padding:2rem}.practice-selection-container .welcome-banner{background:linear-gradient(135deg,#f8f6f2,#fff);border-radius:12px;box-shadow:0 2px 8px #0000001a;margin-bottom:2rem;padding:2rem;text-align:center}.practice-selection-container .welcome-text h1{color:#bf9b63;font-size:2rem;font-weight:600;margin-bottom:1rem}.practice-selection-container .welcome-text p{color:#666;font-size:1.1rem;line-height:1.6}.selection-form{background:#fff;border-radius:12px;box-shadow:0 4px 12px #0000001a;padding:2rem}.form-section{margin-bottom:2rem}.form-label{color:#333;display:block;font-size:1.1rem;font-weight:600;margin-bottom:.75rem}.category-selector{display:flex;gap:.5rem;margin-bottom:1rem}.category-button{background:#f5f5f5;border:2px solid #0000;border-radius:8px;cursor:pointer;flex:1 1;font-weight:500;padding:.75rem 1rem;transition:all .3s ease}.category-button:hover{background:#e0e0e0}.category-button.active{background:#bf9b63;border-color:#a88755;color:#fff}.subject-select{background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:1rem;padding:.75rem;width:100%}.subject-select:focus{border-color:#bf9b63;box-shadow:0 0 0 3px #bf9b631a;outline:none}.preference-grid{grid-gap:0;background:#fff;border:2px solid #ddd;border-radius:12px;display:grid;gap:0;grid-template-columns:1fr 1fr;overflow:hidden;position:relative}.preference-grid:before{height:1px;left:2px;right:2px;top:calc(50% - 9px)}.preference-grid:after,.preference-grid:before{background:#ddd;content:"";position:absolute;z-index:1}.preference-grid:after{bottom:2px;left:50%;top:2px;transform:translateX(-50%);width:1px}.preference-button{background:#0000;border:none;cursor:pointer;padding:1rem;position:relative;transition:all .3s ease;z-index:2}.preference-button:first-child:after,.preference-button:nth-child(3):after{display:none}.preference-button:hover{background:#f5f5f5}.preference-button.active{background:#bf9b63;color:#fff}.preference-content{text-align:center}.preference-title{font-size:.95rem;font-weight:500}.preference-subtitle{display:block;font-size:.8rem;margin-top:.25rem;opacity:.8}.question-count-section{align-items:center;display:flex;gap:1rem;margin-bottom:.5rem}.question-slider{-webkit-appearance:none;background:#ddd;border-radius:3px;flex:1 1;height:6px;outline:none}.question-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;background:#bf9b63;border-radius:50%;box-shadow:0 2px 4px #0003;cursor:pointer;height:20px;width:20px}.question-slider::-moz-range-thumb{background:#bf9b63;border:none;border-radius:50%;box-shadow:0 2px 4px #0003;cursor:pointer;height:20px;width:20px}.recommended-time{color:#bf9b63;font-size:1rem;font-weight:600;min-width:80px;text-align:right}.timing-note{color:#666;font-size:.9rem;font-style:italic;margin-top:.5rem;text-align:center}.start-practice-button{background:linear-gradient(135deg,#bf9b63,#a88755);border:none;border-radius:8px;color:#fff;cursor:pointer;font-size:1.1rem;font-weight:600;margin-top:1rem;padding:1rem 2rem;transition:all .3s ease;width:100%}.start-practice-button:hover:not(:disabled){box-shadow:0 4px 12px #bf9b634d;transform:translateY(-2px)}.start-practice-button.disabled,.start-practice-button:disabled{background:#ccc;cursor:not-allowed;opacity:.6}.access-restriction-notice p{color:#e74c3c;font-size:.9rem;margin-top:1rem;text-align:center}.access-modal-overlay{background:#00000080}.access-modal{background:#fff;border-radius:12px;max-width:500px;padding:2rem;text-align:center}.access-modal h3{margin-bottom:1rem}.access-modal p{color:#666;line-height:1.6;margin-bottom:2rem}.modal-actions{gap:1rem;justify-content:center}.download-app-button{background:#bf9b63;border-radius:8px;padding:.75rem 1.5rem;transition:all .3s ease}.download-app-button:hover{background:#a88755;transform:translateY(-1px)}.cancel-button{background:#f5f5f5;border-radius:8px;color:#333;padding:.75rem 1.5rem;transition:all .3s ease}.cancel-button:hover{background:#e9e9e9}.exam-interface{background:#f8f9fa;display:flex;flex-direction:column;min-height:100vh}.exam-header{align-items:center;background:#fff;box-shadow:0 2px 8px #0000001a;display:flex;justify-content:space-between;padding:1rem 2rem;position:sticky;top:0;z-index:100}.exam-progress .question-counter{color:#333;font-size:1.1rem;font-weight:600}.exam-controls{gap:1rem}.control-button,.exam-controls{align-items:center;display:flex}.control-button{border:2px solid #ddd;border-radius:50%;font-size:1.2rem;height:40px;justify-content:center;transition:all .3s ease;width:40px}.control-button:hover{background:#f5f5f5;border-color:#bf9b63}.control-button.active{background:#bf9b63;border-color:#bf9b63;color:#fff}.timer{background:#f5f5f5;border:2px solid #ddd;border-radius:8px;color:#333;font-family:Courier New,monospace;font-size:1.2rem;font-weight:700;padding:.5rem 1rem}.timer-warning{background:#ffeaea!important;border-color:#e74c3c!important;color:#e74c3c!important}.exam-content{display:flex;flex:1 1;gap:2rem;margin:0 auto;max-width:1200px;padding:2rem;width:100%}.question-section{background:#fff;border-radius:12px;box-shadow:0 4px 12px #0000001a;flex:2 1;height:fit-content;padding:2rem}.question-content{margin-bottom:2rem;position:relative}.watermark{bottom:10px;color:#00000014;font-size:16px;font-weight:700;pointer-events:none;position:absolute;right:10px;transform:rotate(-15deg);white-space:nowrap;z-index:1}.explanation-content .watermark{bottom:auto;color:#0000000d;font-size:24px;left:50%;right:auto;top:50%;transform:translate(-50%,-50%) rotate(-15deg)}.question-text{word-wrap:break-word;color:#333;font-size:1rem;font-weight:400;line-height:1.6;margin-bottom:2rem;position:relative;white-space:pre-wrap;z-index:2}.options-container{display:flex;flex-direction:column;gap:.75rem;position:relative;z-index:2}.option-button{background:#ffffff80;border:2px solid #e0e0e0;border-radius:8px;cursor:pointer;padding:1rem;position:relative;text-align:left;transition:all .3s ease}.option-button:hover{background:#fff9;border-color:#bf9b63}.option-button.selected{background:#fff3;border-color:#bf9b63}.option-content{align-items:flex-start;display:flex;gap:1rem}.option-label{font-size:1.1rem;font-weight:700;min-width:20px}.option-text{flex:1 1;line-height:1.4}.navigation-buttons{align-items:center;display:flex;gap:1rem;justify-content:space-between;margin-top:2rem}.nav-button{background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-weight:500;padding:.75rem 1.5rem;transition:all .3s ease}.nav-button:hover:not(:disabled){background:#fefcf7;border-color:#bf9b63}.nav-button:disabled{cursor:not-allowed;opacity:.5}.submit-button{background:#bf9b63;border:none;border-radius:8px;color:#fff;cursor:pointer;font-weight:600;padding:.75rem 2rem;transition:all .3s ease}.submit-button:hover:not(:disabled){background:#a88755;transform:translateY(-1px)}.submit-button:disabled{cursor:not-allowed;opacity:.6}.submission-result{background:#f8f9fa;border:1px solid #e0e0e0;border-radius:8px;margin-top:1.5rem;padding:1.5rem}.result-header{align-items:center;display:flex;flex-wrap:wrap;gap:2rem;margin-bottom:1rem}.result-indicator{align-items:center;background:#fff;border:1px solid #e0e0e0;border-radius:6px;display:flex;font-size:1.1rem;font-weight:600;gap:.5rem;padding:.5rem 1rem}.result-indicator.correct{background:#d4edda;border-color:#27ae60;color:#27ae60}.result-indicator.incorrect{background:#f8d7da;border-color:#e74c3c;color:#e74c3c}.answer-comparison{display:flex;flex-wrap:wrap;gap:2rem}.answer-item{border:1px solid #e0e0e0;border-radius:6px;gap:.25rem;min-width:120px;padding:.75rem}.answer-label{font-size:.9rem}.answer-value{font-size:1.1rem;font-weight:600}.result-stats{border-top:1px solid #ddd;display:flex;gap:2rem;padding-top:1rem}.stat-item{flex-direction:column;gap:.25rem}.stat-label{color:#666;font-size:.9rem}.stat-value{font-weight:600}.explanation-section{background:#fff;border-radius:12px;box-shadow:0 4px 12px #0000001a;flex:1 1;height:fit-content;max-height:80vh;overflow-y:auto;padding:2rem}.explanation-title{color:#333;font-size:1.3rem;margin-bottom:1rem}.explanation-content{margin-bottom:2rem;position:relative}.explanation-text{word-wrap:break-word;color:#555;line-height:1.6;position:relative;white-space:pre-wrap;z-index:2}.notes-section,.qa-section{border-top:1px solid #e0e0e0;margin-top:2rem;padding-top:1rem}.section-title{font-size:1.1rem;margin-bottom:1rem}.saved-note,.saved-qa{background:#f8f9fa;border-left:4px solid #bf9b63;border-radius:8px;margin-bottom:1rem;padding:1rem}.add-note-button,.add-question-button{background:#0000;border:2px dashed #ddd;border-radius:8px;color:#666;cursor:pointer;padding:.75rem;transition:all .3s ease;width:100%}.add-note-button:hover,.add-question-button:hover{background:#fefcf7;border-color:#bf9b63;color:#bf9b63}.note-input,.question-input{margin-bottom:1rem}.note-input textarea,.question-input textarea{border:2px solid #ddd;border-radius:8px;font-family:inherit;padding:.75rem;resize:vertical;width:100%}.note-input textarea:focus,.question-input textarea:focus{border-color:#bf9b63;outline:none}.note-buttons,.question-buttons{display:flex;gap:.5rem;margin-top:.5rem}.note-buttons button,.question-buttons button{background:#fff;border:1px solid #ddd;border-radius:6px;cursor:pointer;padding:.5rem 1rem;transition:all .3s ease}.note-buttons button:first-child,.question-buttons button:first-child{background:#bf9b63;border-color:#bf9b63;color:#fff}.note-buttons button:hover,.question-buttons button:hover{border-color:#bf9b63}.qa-answer,.qa-question{margin-bottom:.5rem}.qa-answer-content{word-wrap:break-word;color:#444;line-height:1.6;margin-left:1rem;white-space:pre-wrap}.gpt-response{background:#e8f4f8;border-left:4px solid #3498db;border-radius:8px;margin-top:1rem;padding:1rem}.gpt-response-content{color:#2c3e50;margin-left:1rem;white-space:pre-wrap}.gpt-response-content,.html-renderer{word-wrap:break-word;line-height:1.6}.html-renderer p{margin:.5rem 0}.html-renderer ol,.html-renderer ul{margin:.5rem 0;padding-left:1.5rem}.html-renderer li{margin:.25rem 0}.html-renderer h1,.html-renderer h2,.html-renderer h3,.html-renderer h4,.html-renderer h5,.html-renderer h6{font-weight:600;margin:1rem 0 .5rem}.html-renderer b,.html-renderer strong{font-weight:600}.html-renderer em,.html-renderer i{font-style:italic}.html-renderer blockquote{border-left:4px solid #bf9b63;color:#666;margin:1rem 0;padding-left:1rem}.html-renderer code{background:#f5f5f5;border-radius:3px;font-family:Courier New,monospace;font-size:.9em;padding:.2rem .4rem}.html-renderer pre{background-color:#f5f5f5;border-radius:6px;margin:.5rem 0;overflow-x:auto;padding:1rem}.html-renderer pre code{background:none;padding:0}.loading-animation{margin-bottom:1rem}.loading-dots{align-items:center;display:inline-flex;gap:.5rem}.loading-dots span{animation:loading-bounce 1.4s ease-in-out infinite both;background:#bf9b63;border-radius:50%;height:12px;width:12px}.loading-dots span:first-child{animation-delay:-.32s}.loading-dots span:nth-child(2){animation-delay:-.16s}@keyframes loading-bounce{0%,80%,to{opacity:.5;transform:scale(.8)}40%{opacity:1;transform:scale(1.2)}}.loading-text strong{color:#bf9b63;display:block;font-size:1.1rem;margin-bottom:.5rem}.loading-text p{color:#666;font-size:.9rem;margin:0}.loading-content{gap:.5rem}.loading-spinner{border:2px solid #0000;border-top-color:currentcolor;height:16px;width:16px}.add-question-button:disabled,.question-buttons button:disabled,.question-input textarea:disabled{cursor:not-allowed;opacity:.6}.reading-mode-container{bottom:2rem;left:50%;position:fixed;transform:translateX(-50%);z-index:1000}.reading-mode-button{background:#333;border:none;border-radius:25px;box-shadow:0 4px 12px #0000004d;color:#fff;cursor:pointer;font-weight:600;padding:1rem 2rem;transition:all .3s ease}.reading-mode-button.active{background:#bf9b63}.reading-mode-button:hover{box-shadow:0 6px 16px #0006;transform:translateY(-2px)}.answer-sheet-modal{align-items:center;background:#00000080;bottom:0;display:flex;justify-content:center;left:0;padding:2rem;position:fixed;right:0;top:0;z-index:2000}.answer-sheet-content{background:#fff;border-radius:12px;max-height:80vh;max-width:800px;overflow-y:auto;padding:2rem;width:100%}.answer-sheet-header{align-items:center;border-bottom:1px solid #e0e0e0;display:flex;justify-content:space-between;margin-bottom:1.5rem;padding-bottom:1rem}.answer-sheet-header h3{color:#333;margin:0}.close-button{background:none;border:none;border-radius:50%;color:#666;cursor:pointer;font-size:1.5rem;padding:.5rem;transition:all .3s ease}.close-button:hover{background:#f5f5f5;color:#333}.answer-sheet-info{background:#f8f9fa;border-radius:8px;display:flex;justify-content:space-between;margin-bottom:1.5rem;padding:1rem}.accuracy-info,.time-info{color:#333;font-weight:600}.answer-grid{grid-gap:1rem;display:grid;gap:1rem;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));margin-bottom:2rem}.answer-item{align-items:center;background:#fff;border:2px solid #e0e0e0;border-radius:8px;box-sizing:border-box;cursor:pointer;display:flex;flex-direction:column;justify-content:center;min-height:80px;padding:1rem .75rem;position:relative;transition:all .3s ease}.answer-item:hover{background:#fefcf7;border-color:#bf9b63}.answer-item.current{background:#bf9b63;border-color:#bf9b63;color:#fff}.answer-item.answered{background:#e8f5e8;border-color:#27ae60}.answer-item.unanswered{background:#fff5f5;border-color:#e74c3c}.answer-item.flagged{background:#fff8e1;border-color:#f39c12}.answer-item.submitted.correct{background:#d4edda;border-color:#27ae60}.answer-item.submitted.incorrect{background:#f8d7da;border-color:#e74c3c}.question-number{font-size:.9rem;font-weight:600;margin-bottom:.5rem}.selected-answer{font-size:1.1rem;font-weight:700}.answer-details{display:flex;flex-direction:column;font-size:.8rem;gap:.25rem;width:100%}.correct-answer,.user-answer{align-items:center;display:flex;justify-content:space-between}.answer-label{color:#666;font-size:.7rem;font-weight:500}.answer-value{font-size:.8rem;font-weight:700}.user-answer .answer-value{color:#333}.correct-answer .answer-value{color:#27ae60}.result-status{align-items:center;background:#0000;border:none;display:flex;flex-direction:column;gap:.125rem;margin-top:.25rem;text-align:center}.result-text{font-size:.7rem;font-weight:600;text-transform:uppercase}.result-icon{font-size:1.2rem;font-weight:700}.result-status.correct{color:#27ae60}.result-status.incorrect{color:#e74c3c}.flag-indicator{font-size:.8rem;position:absolute;right:-5px;top:-5px}.answer-item .result-indicator{background:#fff;border-radius:50%;bottom:-5px;font-size:.8rem;padding:2px;position:absolute;right:-5px}.answer-sheet-actions{border-top:1px solid #e0e0e0;display:flex;gap:1rem;justify-content:center;padding-top:1rem}.submit-all-button{background:#bf9b63;border:none;border-radius:8px;color:#fff;cursor:pointer;font-weight:600;padding:1rem 2rem;transition:all .3s ease}.submit-all-button:hover:not(:disabled){background:#a88755;transform:translateY(-1px)}.submit-all-button:disabled{cursor:not-allowed;opacity:.6}.close-sheet-button{background:#0000;border:2px solid #ddd;border-radius:8px;color:#666;cursor:pointer;font-weight:600;padding:1rem 2rem;transition:all .3s ease}.close-sheet-button:hover{border-color:#bf9b63;color:#bf9b63}.error-alert{align-items:center;background:#00000080;bottom:0;display:flex;justify-content:center;left:0;position:fixed;right:0;top:0;z-index:3000}.error-content{background:#fff;border-radius:12px;box-shadow:0 8px 24px #0000004d;max-width:400px;padding:2rem;text-align:center}.error-content p{color:#333;line-height:1.5;margin-bottom:1.5rem}.error-content button{background:#bf9b63;border:none;border-radius:8px;color:#fff;cursor:pointer;font-weight:600;padding:.75rem 2rem;transition:all .3s ease}.error-content button:hover{background:#a88755}.exam-loading{align-items:center;background:#f8f9fa;display:flex;justify-content:center;min-height:100vh}.exam-loading p{color:#666;font-size:1.2rem}@media (max-width:768px){.exam-content{flex-direction:column;padding:1rem}.answer-grid{grid-template-columns:repeat(auto-fill,minmax(60px,1fr))}.exam-header{flex-wrap:wrap;gap:1rem;padding:1rem}.exam-controls{gap:.5rem}.control-button{font-size:1rem;height:35px;width:35px}.navigation-buttons{flex-wrap:wrap}.answer-sheet-content,.answer-sheet-modal,.practice-selection-container,.selection-form{padding:1rem}.category-selector{flex-direction:column}.preference-grid{grid-template-columns:1fr}.preference-grid:before{height:1px;top:25%}.preference-grid:after{height:1px;left:0;top:50%;transform:translateY(-50%);width:100%}.preference-button:not(:last-child):after,.preference-button:not(:nth-child(2)):after{display:none}}.markdown-renderer{color:#333;line-height:1.6}.markdown-renderer h1,.markdown-renderer h2,.markdown-renderer h3,.markdown-renderer h4,.markdown-renderer h5,.markdown-renderer h6{color:#bf9b63;margin-bottom:.5rem;margin-top:1rem}.markdown-renderer p{margin-bottom:.75rem}.markdown-renderer ol,.markdown-renderer ul{margin-bottom:.75rem;padding-left:1.5rem}.markdown-renderer li{margin-bottom:.25rem}.markdown-renderer strong{color:#333;font-weight:700}.markdown-renderer em{font-style:italic}.markdown-renderer code{background-color:#f5f5f5;border-radius:3px;color:#d63384;font-family:Courier New,monospace;font-size:.9rem;padding:.2rem .4rem}.markdown-renderer pre{background-color:#f8f9fa;border:1px solid #e9ecef;border-radius:5px;margin-bottom:.75rem;overflow-x:auto;padding:1rem}.markdown-renderer pre code{background:none;border-radius:0;color:#333;padding:0}.markdown-renderer blockquote{background-color:#fafafa;border-left:4px solid #bf9b63;border-radius:0 5px 5px 0;color:#666;font-style:italic;margin:.75rem 0;padding:.75rem 1rem}.markdown-renderer table{border-collapse:collapse;margin-bottom:.75rem;width:100%}.markdown-renderer td,.markdown-renderer th{border:1px solid #ddd;padding:.5rem;text-align:left}.markdown-renderer th{background-color:#f8f9fa;font-weight:700}.gpt-loading-indicator{background:linear-gradient(135deg,#f8f9fa,#e9ecef);border:2px solid #bf9b63;border-radius:12px;box-shadow:0 4px 12px #bf9b631a;margin:1rem 0;padding:1.5rem;text-align:center}.completion-status{align-items:center;background-color:#f8f8f8;border:1px solid #e0e0e0;border-radius:20px;cursor:pointer;display:flex;margin-top:15px;padding:8px 12px;transition:all .2s ease;width:fit-content}.completion-status:hover{background-color:#f0f0f0;border-color:#d0d0d0;box-shadow:0 2px 4px #0000001a;transform:translateY(-2px)}.completion-indicator{align-items:center;display:flex;justify-content:center;margin-right:8px}.completion-indicator.completed{color:#4caf50}.completion-indicator.incomplete{color:#9e9e9e}.status-icon{font-size:18px;font-weight:700}.completion-text{color:#555;font-size:14px;font-weight:500}.chapter-card{background-color:#fff;border-radius:12px;box-shadow:0 4px 15px #0000000d;color:#333;display:block;height:100%;overflow:hidden;position:relative;text-decoration:none;transition:all .3s ease}.chapter-card:hover{box-shadow:0 8px 20px #0000001a;transform:translateY(-3px)}.chapter-card.locked{opacity:.85;position:relative}.chapter-card.locked:before{background-color:#fff3;bottom:0;content:"";left:0;pointer-events:none;position:absolute;right:0;top:0;z-index:1}.chapter-card-content{display:flex;flex-direction:column;height:100%;padding:20px}.chapter-header{align-items:flex-start;display:flex;justify-content:space-between;margin-bottom:15px}.chapter-title{flex:1 1;font-size:18px;line-height:1.4}.lock-icon{font-size:20px;margin-left:10px}.chapter-description{color:#666;flex-grow:1;font-size:14px;line-height:1.5;margin-bottom:15px}.chapter-stats{grid-gap:10px;display:grid;gap:10px;grid-template-columns:repeat(2,1fr);margin-bottom:20px}.stat-item{align-items:center;color:#555;display:flex;font-size:13px}.stat-icon{font-size:16px;margin-right:8px}.chapter-progress{margin-top:auto}.progress-fill{background-color:#bf9b63}.access-modal-overlay{align-items:center;background-color:#0009;bottom:0;display:flex;justify-content:center;left:0;position:fixed;right:0;top:0;z-index:1000}.access-modal{animation:modalFadeIn .3s ease;background-color:#fff;border-radius:8px;box-shadow:0 5px 20px #0003;max-width:400px;padding:25px;width:90%}@keyframes modalFadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.access-modal h3{color:#333;font-size:20px;margin-bottom:15px;margin-top:0}.access-modal p{color:#555;font-size:15px;line-height:1.5;margin-bottom:20px}.modal-actions{display:flex;flex-direction:column;gap:10px}.download-app-button{background-color:#bf9b63;border:none;border-radius:6px;color:#fff;cursor:pointer;font-size:15px;font-weight:600;padding:12px 16px;text-align:center;text-decoration:none;transition:background-color .2s}.download-app-button:hover{background-color:#a88755}.cancel-button{background-color:initial;border:1px solid #ddd;border-radius:6px;color:#666;cursor:pointer;font-size:15px;padding:12px 16px;transition:all .2s}.cancel-button:hover{background-color:#f5f5f5;color:#333}.chapter-list-container{margin:0 auto;max-width:1200px;padding:20px}.chapter-list-header{align-items:center;display:flex;margin-bottom:30px}.back-button{background-color:initial;color:#333;margin-right:20px;padding:8px 12px;transition:all .2s ease}.back-button:hover{background-color:#f0f0f0;border-radius:4px}.back-icon{margin-right:8px}.subject-title{color:#333;font-size:28px;font-weight:700;margin:0}.error-message{background-color:#fff6f6;border-left:4px solid #e53935;border-radius:4px;color:#c62828;font-size:14px;padding:12px 16px}.error-message button{background-color:initial;border:1px solid #c62828;border-radius:4px;color:#c62828;font-size:12px;padding:4px 8px}.error-message button:hover{background-color:#ffebee}.subject-description{color:#555;line-height:1.6;margin-bottom:30px}.subject-image{border-radius:8px;box-shadow:0 4px 12px #0000001a;height:auto;margin-top:15px;max-width:100%}.section-title{border-bottom:2px solid #bf9b63;color:#333;font-size:24px;font-weight:600;margin-bottom:20px;padding-bottom:10px}.chapters-grid{grid-gap:20px;display:grid;gap:20px;grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}.no-chapters{background-color:#f8f9fa;border-radius:8px;color:#666;padding:30px;text-align:center}@media (max-width:768px){.chapter-list-header{align-items:flex-start;flex-direction:column}.back-button{margin-bottom:15px}.chapters-grid{grid-template-columns:1fr}}.video-section{margin-bottom:15px}.video-title{color:#333;font-size:1.1rem;font-weight:600;margin-bottom:10px}.video-selection{margin:10px 0 20px}.video-selection-title{color:#333;font-size:1.1rem;font-weight:600;margin-bottom:10px}.video-buttons{display:flex;flex-wrap:wrap;gap:10px}.video-select-button{background-color:#f5f5f5;border:1px solid #ddd;border-radius:5px;cursor:pointer;font-size:14px;font-weight:500;padding:10px 15px;transition:all .2s}.video-select-button:hover{background-color:#e6e6e6;box-shadow:0 2px 4px #0000001a;transform:translateY(-2px)}.video-select-button.active{background-color:#4285f4;border-color:#4285f4;box-shadow:0 2px 4px #4285f44d;color:#fff}.chapter-detail-container{background-color:#fff;margin:0 auto;max-width:1200px;padding:20px}.chapter-detail-header{align-items:center;display:flex;margin-bottom:20px}.back-button{align-items:center;background:none;border:none;color:#555;cursor:pointer;display:flex;font-size:16px;margin-right:15px}.back-icon{font-size:20px;margin-right:5px}.chapter-title{color:#333;font-size:24px;font-weight:600;margin:0}.error-message{align-items:center;background-color:#ffebee;border-radius:5px;color:#d32f2f;display:flex;justify-content:space-between;margin-bottom:20px;padding:15px}.error-message button{background:none;border:none;color:#d32f2f;cursor:pointer;font-weight:500}.chapter-content{display:flex;flex-direction:column;gap:20px}.video-section{background-color:#000;border-radius:8px;overflow:hidden;width:100%}.content-tabs{border:1px solid #e0e0e0;border-radius:8px;overflow:hidden}.tab-buttons{background-color:#f5f5f5;border-bottom:1px solid #e0e0e0;display:flex}.tab-button{background:none;border:none;border-bottom:3px solid #0000;cursor:pointer;flex:1 1;font-size:16px;padding:12px;transition:all .2s}.tab-button.active{background-color:#fff;border-bottom-color:#4285f4;font-weight:500}.tab-content{max-height:500px;min-height:300px;overflow-y:auto;padding:20px}.homework-content,.keynotes-content,.transcript-content{line-height:1.6}.no-content-message{color:#888;font-style:italic;margin-top:40px;text-align:center}.completion-toggle{display:flex;justify-content:center;margin-top:10px}.completion-button{align-items:center;background-color:#f5f5f5;border:1px solid #ddd;border-radius:20px;cursor:pointer;display:flex;justify-content:center;padding:10px 20px;transition:all .2s}.completion-button.completed{background-color:#e8f5e9;border-color:#a5d6a7;color:#2e7d32}.completion-icon{font-size:18px;font-weight:700;margin-right:8px}.video-player-container{aspect-ratio:16/9;background-color:#000;position:relative;width:100%}.video-element{height:100%;object-fit:contain;width:100%}.video-loader{align-items:center;background-color:#000000b3;bottom:0;color:#fff;display:flex;flex-direction:column;justify-content:center;left:0;position:absolute;right:0;top:0}.loader-spinner{animation:spin 1s ease-in-out infinite;border:5px solid #ffffff4d;border-radius:50%;border-top-color:#fff;height:50px;margin-bottom:10px;width:50px}.video-error{background-color:#000000b3;color:#fff;justify-content:center;top:0}.video-controls,.video-error{align-items:center;bottom:0;display:flex;left:0;position:absolute;right:0}.video-controls{background:linear-gradient(#0000,#000000b3);gap:10px;padding:10px}.control-button{background:none;border:none;color:#fff;cursor:pointer;font-size:18px;padding:5px}.progress-container{align-items:center;display:flex;flex:1 1;gap:10px}.time-display{color:#fff;font-size:14px;min-width:45px}.progress-bar{-webkit-appearance:none;appearance:none;background:#ffffff4d;flex:1 1;height:5px;outline:none}.progress-bar::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;background:#fff;border-radius:50%;cursor:pointer;height:15px;width:15px}.volume-container{align-items:center;display:flex}.volume-slider{-webkit-appearance:none;appearance:none;background:#ffffff4d;border-radius:3px;height:5px;outline:none;width:80px}.volume-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;background:#fff;border-radius:50%;cursor:pointer;height:12px;width:12px}.study-plan-calendar{grid-gap:20px;display:grid;gap:20px;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));margin-top:20px}.study-day{background:linear-gradient(135deg,#f5f7fa,#ebf4f8);border-radius:12px;box-shadow:0 4px 15px #0000000d;display:flex;flex-direction:column;height:100%;padding:15px;transition:all .3s ease}.study-day:hover{box-shadow:0 8px 20px #0000001a;transform:translateY(-5px)}.study-day h4{border-bottom:2px solid #4285f44d;color:#4a4a4a;font-size:1rem;font-weight:600;margin:0 0 12px;padding-bottom:8px}.study-day.today{background:linear-gradient(135deg,#f0f7ff,#e6f2ff);border-left:4px solid #4285f4;padding-left:11px}.study-day.today h4{color:#4285f4;font-weight:700}.study-day-progress{margin-bottom:15px}.progress-bar{background-color:#e9e9e9;border-radius:3px;height:6px;margin-bottom:8px;overflow:hidden}.progress-fill{background-color:#4caf50;border-radius:3px;height:100%;transition:width .5s ease}.progress-text{color:#777;display:block;font-size:12px;text-align:right}.study-cards{display:flex;flex:1 1;flex-direction:column;gap:8px;max-height:250px;overflow-y:auto;padding-right:5px}.study-cards::-webkit-scrollbar{width:4px}.study-cards::-webkit-scrollbar-track{background:#f1f1f1;border-radius:2px}.study-cards::-webkit-scrollbar-thumb{background:#ddd;border-radius:2px}.study-cards::-webkit-scrollbar-thumb:hover{background:#ccc}.study-card{align-items:center;background-color:#fff;border-radius:8px;box-shadow:0 2px 5px #0000000d;cursor:pointer;display:flex;justify-content:space-between;padding:10px 15px;transition:all .2s ease}.study-card:hover{background-color:#f9f9f9;box-shadow:0 3px 8px #00000014;transform:translateX(3px)}.study-card:active{transform:translateX(1px)}.study-card.completed{background-color:#e8f5e9;border-left:3px solid #4caf50}.card-title{color:#555;flex:1 1;font-size:.9rem;font-weight:500}.card-status{align-items:center;background-color:#f0f0f0;border-radius:50%;color:#999;display:flex;font-size:1rem;height:24px;justify-content:center;margin-left:10px;width:24px}.study-card.completed .card-status{background-color:#4caf50;color:#fff}@media (max-width:768px){.study-plan-calendar{flex-direction:column}.study-day{min-width:100%}}.qa-section-header{align-items:center;border-bottom:2px solid #e8f4f8;display:flex;justify-content:space-between;margin-bottom:20px;padding-bottom:12px}.remaining-questions-badge{align-items:center;border-radius:12px;box-shadow:0 2px 8px #0000001a;display:flex;font-size:12px;font-weight:600;gap:8px;padding:8px 12px;transition:all .3s ease}.remaining-questions-badge.normal{background:linear-gradient(135deg,#4caf50,#45a049);color:#fff}.remaining-questions-badge.low{animation:pulse 2s infinite;background:linear-gradient(135deg,#ff9800,#f57c00);color:#fff}.remaining-questions-badge.exhausted{background:linear-gradient(135deg,#f44336,#d32f2f);color:#fff}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}.badge-icon{font-size:16px;line-height:1}.badge-content{align-items:center;display:flex;flex-direction:column;gap:2px}.badge-number{font-size:16px;font-weight:700;line-height:1}.badge-text{font-size:10px;letter-spacing:.5px;opacity:.9;text-transform:uppercase}.questions-exhausted-notice{align-items:flex-start;background:linear-gradient(135deg,#fff3e0,#ffeaa7);border:1px solid #ffb74d;border-radius:12px;box-shadow:0 2px 8px #ffb74d33;display:flex;gap:12px;margin-bottom:20px;padding:16px}.notice-icon{font-size:20px;margin-top:2px}.notice-content h6{color:#e65100;font-size:14px;font-weight:600;margin:0 0 8px}.notice-content p{color:#bf360c;font-size:13px;line-height:1.4;margin:0 0 8px}.notice-content small{color:#ff8f00;font-size:11px;font-style:italic}.add-question-button{align-items:center;border:none;border-radius:8px;cursor:pointer;display:flex;font-size:14px;font-weight:600;gap:8px;justify-content:center;margin-top:16px;padding:12px 16px;transition:all .3s ease;width:100%}.add-question-button:not(.disabled){background:linear-gradient(135deg,#667eea,#764ba2);box-shadow:0 4px 12px #667eea4d;color:#fff}.add-question-button:not(.disabled):hover{box-shadow:0 6px 16px #667eea66;transform:translateY(-2px)}.add-question-button.disabled{background:linear-gradient(135deg,#bdc3c7,#95a5a6);box-shadow:0 2px 4px #0000001a;color:#7f8c8d;cursor:not-allowed}.active-content,.disabled-content{align-items:center;display:flex;gap:8px}.active-icon,.disabled-icon{font-size:16px}.question-buttons button{border:none;border-radius:6px;cursor:pointer;font-size:13px;font-weight:600;padding:10px 16px;transition:all .3s ease}.question-buttons button:first-child{background:linear-gradient(135deg,#667eea,#764ba2);box-shadow:0 2px 8px #667eea4d;color:#fff}.question-buttons button:first-child:not(.disabled):hover{box-shadow:0 4px 12px #667eea66;transform:translateY(-1px)}.question-buttons button:first-child.disabled{background:linear-gradient(135deg,#bdc3c7,#95a5a6);color:#7f8c8d;cursor:not-allowed}.question-buttons button:last-child{background:#ecf0f1;border:1px solid #bdc3c7;color:#2c3e50}.question-buttons button:last-child:hover{background:#d5dbdb}.loading-content{align-items:center;display:flex;gap:8px}.loading-spinner{animation:spin 1s linear infinite;border:2px solid #ffffff4d;border-radius:50%;border-top-color:#fff;height:12px;width:12px}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}@media (max-width:768px){.qa-section-header{align-items:flex-start;flex-direction:column;gap:12px}.remaining-questions-badge{align-self:flex-end}.questions-exhausted-notice{flex-direction:column;text-align:center}.notice-icon{align-self:center}}