body,html{width:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;margin:0;overflow-x:hidden;overflow-y:auto}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}#root{width:100%}button,input,textarea{font-family:inherit}.typography{margin:0;padding:0}.typography-h1{font-size:3.5rem}.typography-h1,.typography-h2{font-weight:700;margin-bottom:.5rem}.typography-h2{font-size:2.8rem}.typography-h3{font-size:2.2rem}.typography-h3,.typography-h4{font-weight:600;margin-bottom:.4rem}.typography-h4{font-size:1.8rem}.typography-h5{font-size:1.5rem;font-weight:500;margin-bottom:.3rem}.typography-subtitle1{font-size:1.3rem;font-weight:500;margin-bottom:.3rem}.typography-subtitle2{font-size:1.1rem;font-weight:500;margin-bottom:.2rem}.typography-body1{font-size:1rem}.typography-body1,.typography-body2{font-weight:400;line-height:1.5;margin-bottom:.2rem}.typography-body2{font-size:.9rem}.typography-caption{font-size:.8rem;font-weight:400;line-height:1.4}.typography-default{color:inherit}.typography-primary{color:#ed2939}.typography-secondary{color:#002395}.typography-white{color:#fff}.typography-light{color:#fffc}.typography-dark{color:#333}.typography-left{text-align:left}.typography-center{text-align:center}.typography-right{text-align:right}.button{align-items:center;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);border:none;border-radius:30px;cursor:pointer;display:inline-flex;font-weight:600;justify-content:center;letter-spacing:1px;overflow:hidden;position:relative;text-transform:uppercase;transition:all .3s ease}.button:after{background:linear-gradient(90deg,#fff0,#fff3 50%,#fff0);content:"";height:100%;left:-100%;position:absolute;top:0;transition:left .6s ease;width:100%}.button:hover:after{left:100%}.button-primary{background:linear-gradient(135deg,#3f5efb,#fc466b);box-shadow:0 4px 15px #3f5efb66;color:#fff}.button-primary:hover{box-shadow:0 6px 20px #3f5efb99;transform:translateY(-2px)}.button-secondary{background:linear-gradient(135deg,#4e4376,#2b5876);box-shadow:0 4px 15px #2b587666;color:#fff}.button-secondary:hover{box-shadow:0 6px 20px #2b587699;transform:translateY(-2px)}.button-outline{background:#10121e66;border:1px solid #fff3;box-shadow:0 4px 15px #0003;color:#fff}.button-outline:hover{background:#3f5efb1a;border-color:#3f5efb66;transform:translateY(-2px)}.button:disabled{box-shadow:none!important;cursor:not-allowed;opacity:.6;transform:none!important}.button:disabled:after{display:none}.button-small{font-size:.8rem;padding:8px 16px}.button-medium{font-size:.9rem;padding:12px 24px}.button-large{font-size:1rem;padding:16px 32px}.pdf-uploader{align-items:center;display:flex;flex-direction:column;gap:1rem;margin:1rem 0}.pdf-upload-button{border-radius:8px;cursor:pointer;padding:.75rem 1.5rem;transition:all .3s ease}.pdf-upload-button:hover{box-shadow:0 4px 8px #0000001a;transform:translateY(-2px)}.pdf-upload-button:disabled{cursor:not-allowed;opacity:.7;transform:none}.error-message{color:#f44}.error-message,.success-message{margin-top:.5rem;text-align:center}.success-message{color:#4caf50}.loading-message{animation:pulse 1.5s infinite;color:#2196f3;margin-top:.5rem;text-align:center}.model-viewer-container{align-items:center;display:flex;justify-content:center;overflow:hidden;position:relative;transition:all .3s ease}.model-viewer-container:hover{box-shadow:var(--shadow-md)}model-viewer{--poster-color:#0000;--interaction-prompt:none!important;--interaction-prompt-color:#0000!important;--interaction-prompt-opacity:0!important;--interaction-prompt-scale:0!important;--progress-bar-height:0!important;--progress-bar-color:#0000!important;--progress-mask:none!important;--progress-bar-size:0!important;background-color:initial;cursor:none!important;height:100%;width:100%}model-viewer::part(default-ar-button),model-viewer::part(default-ar-prompt),model-viewer::part(default-error),model-viewer::part(default-interaction-prompt),model-viewer::part(default-progress-bar),model-viewer::part(poster){display:none!important;opacity:0!important;visibility:hidden!important}.model-viewer-loading{align-items:center;background-color:#0003;border-radius:8px;display:flex;height:100%;justify-content:center;left:0;position:absolute;top:0;width:100%}.spinner{animation:spin 1s ease-in-out infinite;border:4px solid #ffffff4d;border-radius:50%;border-top-color:#fff;height:40px;width:40px}@keyframes spin{to{transform:rotate(1turn)}}.floating-character-model{position:absolute;transform:translate(-50%,-50%);transition:none;z-index:25}.floating-model{transition:all .3s ease}.chapters-floating-models .floating-character-model .floating-model{transform-style:preserve-3d;transition:transform .5s ease}.chapters-floating-models .floating-character-model:hover .floating-model{transform:scale(1.3) translateZ(50px) rotateY(10deg)}.floating-character-model.kicked .floating-model{transform:scale(.8);transition:transform .15s cubic-bezier(.18,.89,.32,1.28)}.floating-character-model.bounced .floating-model{transform:scale(.9);transition:transform .1s cubic-bezier(.25,.46,.45,.94)}.floating-character-model:hover .floating-model{transform:scale(1.2)}.ni-model-enlarged{z-index:6}.ni-model-enlarged .floating-model{opacity:1!important}.ni-model-enlarged:hover .floating-model{transform:scale(1.1)}@media (max-width:768px){.floating-character-model{display:none}.floating-character-model:first-child,.floating-character-model:nth-child(2){display:block;transform:scale(.7) translate(-50%,-50%)}}.floating-models-container{height:100%;left:0;overflow:visible;pointer-events:none;position:absolute;top:0;width:100%;z-index:20}.floating-models-container .floating-character-model{cursor:none;filter:drop-shadow(0 0 10px rgba(63,94,251,.5));pointer-events:auto}.chapters-floating-models .floating-character-model{filter:drop-shadow(0 0 15px rgba(63,94,251,.6))}.landing-template{align-items:center;background:#0c0e18;color:#fff;display:flex;font-family:Inter,Roboto,sans-serif;justify-content:center;min-height:100vh;overflow:hidden;padding:2rem;position:relative}.landing-template:before{background-image:linear-gradient(#ffffff08 1px,#0000 0),linear-gradient(90deg,#ffffff08 1px,#0000 0);background-size:30px 30px;z-index:1}.landing-template:after,.landing-template:before{content:"";height:100%;left:0;pointer-events:none;position:absolute;top:0;width:100%}.landing-template:after{animation:backgroundPulse 15s ease-in-out infinite alternate;background:radial-gradient(circle at 10% 20%,#3f5efb26 0,#3f5efb00 30%),radial-gradient(circle at 90% 30%,#fc466b26 0,#fc466b00 30%),radial-gradient(circle at 80% 80%,#833ab426 0,#833ab400 25%),radial-gradient(circle at 30% 70%,#1de9b626 0,#1de9b600 35%);z-index:0}@keyframes backgroundPulse{0%{opacity:.8}50%{opacity:1}to{opacity:.9}}.gradient-orb{border-radius:50%;filter:blur(70px);mix-blend-mode:lighten;opacity:.25;pointer-events:none;position:absolute;z-index:0}.gradient-orb:first-child{animation:float 25s ease-in-out infinite alternate;background:radial-gradient(circle,#3f5efbb3 0,#3f5efb00 70%);height:750px;right:-150px;top:-250px;width:750px}.gradient-orb:nth-child(2){animation:float 30s ease-in-out infinite alternate-reverse;background:radial-gradient(circle,#fc466bb3 0,#fc466b00 70%);bottom:-150px;height:600px;left:-100px;width:600px}.gradient-orb:nth-child(3){animation:float 35s ease-in-out infinite alternate;background:radial-gradient(circle,#833ab499 0,#833ab400 70%);height:500px;right:30%;top:40%;width:500px}.gradient-orb:nth-child(4){animation:float 28s ease-in-out infinite alternate-reverse;background:radial-gradient(circle,#1de9b699 0,#1de9b600 70%);height:450px;left:20%;top:60%;width:450px}@keyframes float{0%{transform:translate(0) scale(1)}25%{transform:translate(50px,20px) scale(1.05)}50%{transform:translate(10px,-30px) scale(.95)}75%{transform:translate(-30px,10px) scale(1.02)}to{transform:translate(20px,40px) scale(.98)}}.landing-content{box-sizing:border-box;max-width:1100px;padding:3.5rem;position:relative;transition:transform .3s ease;width:100%;z-index:15}.landing-content:hover{transform:translateY(-5px)}.landing-header{margin-bottom:3rem;position:relative;text-align:center}.interview-icon{align-items:center;background:linear-gradient(135deg,#3f5efb,#fc466b);border-radius:12px;box-shadow:0 10px 30px #3f5efb4d;display:flex;font-size:2.5rem;height:80px;justify-content:center;margin:0 auto 1.5rem;overflow:hidden;position:relative;transform:perspective(1000px) rotateX(10deg);width:80px}.interview-icon:before{background:linear-gradient(90deg,#0000,#ffffff80,#0000);content:"";height:1px;left:0;position:absolute;right:0;top:0}.interview-icon:after{animation:shimmer 3s infinite;background:linear-gradient(#ffffff4d,#ffffff1a 30%,#fff0 60%);content:"";height:200%;left:-50%;position:absolute;top:-50%;transform:rotate(30deg);width:200%}.landing-title{background:linear-gradient(90deg,#3f5efb,#fc466b);-webkit-background-clip:text;background-clip:text;color:#0000;font-size:3rem;font-weight:800;letter-spacing:-.5px;margin-bottom:.8rem;text-shadow:0 4px 8px #0000004d}.landing-subtitle{color:#fffc;font-size:1.2rem;margin-bottom:1.5rem;margin-left:auto;margin-right:auto;max-width:650px}.pdf-success{-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);background-color:#1de9b61a;border-left:4px solid #1de9b680;border-radius:8px;box-shadow:0 2px 8px #0003;color:#1de9b6e6;margin:1.2rem 0;padding:1rem}.glass-card{-webkit-backdrop-filter:blur(15px);backdrop-filter:blur(15px);background:#10121eb3;border-radius:20px;box-shadow:0 15px 50px #0000004d}.learning-options{display:flex;flex-direction:row;gap:2rem;justify-content:space-between}.option-card{background:#16182480;border:1px solid #ffffff0d;border-radius:16px;box-shadow:0 8px 32px #0000001a;display:flex;flex:1 1;flex-direction:column;overflow:hidden;padding:2rem;position:relative;transition:all .3s ease}.option-card:before{background:linear-gradient(90deg,#0000,#3f5efb80,#0000);content:"";height:2px;left:0;position:absolute;top:0;width:100%}.option-card:hover{box-shadow:0 15px 40px #0003;transform:translateY(-10px)}.option-title{color:#fff;font-size:1.6rem;font-weight:700;letter-spacing:-.5px;margin-bottom:1.5rem;padding-bottom:1rem;position:relative}.option-title:before{background:linear-gradient(90deg,#0000,#3f5efbb3,#0000);border-radius:2px;bottom:0;content:"";height:3px;left:25%;position:absolute;width:50%}.option-description{color:#ffffffb3;flex-grow:1;font-size:.95rem;line-height:1.6;margin-bottom:1.5rem}.option-divider{align-items:center;display:flex;flex-direction:column;justify-content:center;position:relative;width:80px}.option-divider:after,.option-divider:before{background:linear-gradient(180deg,#fff0,#ffffff4d,#fff0);content:"";height:80px;width:1px}.option-divider span{align-items:center;background:#161824b3;border:1px solid #3f5efb33;border-radius:50%;box-shadow:0 5px 15px #0000001a;color:#ffffffb3;display:flex;font-size:.85rem;height:40px;justify-content:center;margin:1rem 0;padding:.8rem;width:40px;z-index:1}.upload-hint{color:#fff9;font-size:.85rem;font-style:italic;margin-top:.8rem;text-align:center}.landing-cta{margin-top:2rem;width:100%}@media (max-width:768px){.landing-content{margin:1rem;padding:2rem}.learning-options{flex-direction:column;gap:2.5rem}.option-divider{flex-direction:row;height:60px;width:100%}.option-divider:after,.option-divider:before{height:1px;width:100%}.landing-title{font-size:2.2rem}.landing-subtitle{font-size:1rem}}.avatar{border-radius:50%;display:inline-block;overflow:hidden;position:relative}.avatar-small{height:32px;width:32px}.avatar-medium{height:40px;width:40px}.avatar-large{height:56px;width:56px}.avatar-image{height:100%;object-fit:cover;width:100%}.avatar-status{border:2px solid #fff;border-radius:50%;bottom:0;height:10px;position:absolute;right:0;width:10px}.avatar-status-online{background-color:#4caf50}.avatar-status-away{background-color:#ffc107}.avatar-status-offline{background-color:#9e9e9e}.avatar-status-busy{background-color:#f44336}.voice-settings{position:relative}.header-voice-settings{margin-right:5px}.voice-settings-toggle{align-items:center;display:flex;height:36px;justify-content:center;padding:0;width:36px}.settings-icon{font-size:1.1rem}.voice-settings-panel{animation:panel-enter .2s ease-out;background-color:#fff;border-radius:8px;box-shadow:0 4px 15px #0003;display:flex;flex-direction:column;max-height:70vh;overflow:hidden;padding:15px;position:absolute;transform-origin:bottom right;width:300px;z-index:1000}.panel-bottom{margin-top:10px;right:0;top:100%}.panel-top{animation:panel-enter-top .2s ease-out;bottom:100%;margin-bottom:10px;right:0;transform-origin:top right}@keyframes panel-enter{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}@keyframes panel-enter-top{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.voice-settings-title{border-bottom:1px solid #eee;margin-bottom:10px;padding-bottom:5px}.voice-list{flex-grow:1;max-height:calc(60vh - 100px);overflow-y:auto;padding-right:5px}.voice-list::-webkit-scrollbar{width:5px}.voice-list::-webkit-scrollbar-track{background:#f1f1f1}.voice-list::-webkit-scrollbar-thumb{background:#c1c1c1;border-radius:3px}.voice-group{margin-bottom:15px}.voice-group-label{display:block;font-weight:700;margin-bottom:5px}.voice-option{font-size:.85rem;margin:3px;padding:6px 10px}.voice-settings-actions{border-top:1px solid #eee;display:flex;justify-content:space-between;margin-top:15px;padding-top:10px}.reset-button{background-color:#002395}@media (max-height:600px){.voice-settings-panel{bottom:100%;margin-bottom:10px;margin-top:0;top:auto}}.chat-header{align-items:center;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#10121ef2;border-bottom:1px solid #3f5efb26;display:flex;height:60px;justify-content:space-between;padding:12px 20px;position:sticky;top:0;width:100%;z-index:20}.chat-header:after{background:linear-gradient(90deg,#3f5efb00,#3f5efb4d 50%,#3f5efb00);bottom:0;content:"";height:1px;left:0;position:absolute;right:0;z-index:2}.chat-header-left{align-items:center;display:flex;gap:12px;overflow:hidden}.chat-header-info{color:#fff;display:flex;flex-direction:column;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-header-name{-webkit-text-fill-color:#0000;background:linear-gradient(90deg,#fff,#aaa);-webkit-background-clip:text;font-weight:600}.chat-header-status{color:#ffffffb3;font-size:.8rem;margin-top:-2px}.chat-header-actions{align-items:center;display:flex;flex-shrink:0;gap:8px}.chat-header-action{align-items:center;background:#161824b3;border:1px solid #3f5efb33;border-radius:50%;color:#ffffffb3;display:flex;height:36px;justify-content:center;padding:0;transition:all .3s ease;width:36px}.chat-header-action:hover{background:#1e213acc;color:#fff;transform:translateY(-2px)}.action-icon{font-size:1.1rem}.chat-header-back{align-items:center;background:#161824b3;border:1px solid #3f5efb33;border-radius:50%;color:#ffffffb3;display:flex;flex-shrink:0;font-size:1.2rem;height:32px;justify-content:center;margin-right:4px;padding:0;transition:all .3s ease;width:32px}.chat-header-back:hover{background:#1e213acc;color:#fff;transform:translateY(-2px)}.message-bubble{word-wrap:break-word;border-radius:18px;box-shadow:0 4px 15px #0000001a;cursor:default;margin-bottom:12px;max-width:70%;overflow-x:auto;padding:12px 18px;position:relative;transition:all .3s ease}.message-other{align-self:flex-start;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);background-color:#161824cc;border:1px solid #3f5efb26;border-bottom-left-radius:4px;color:#ffffffe6}.message-user{align-self:flex-end;background:linear-gradient(135deg,#3f5efbe6,#fc466be6);border-bottom-right-radius:4px;box-shadow:0 4px 15px #3f5efb33;color:#fff}.message-content{font-size:.95rem;line-height:1.5;margin-bottom:6px;position:relative;white-space:pre-wrap}.message-content pre{background:#10121e99;border:1px solid #3f5efb33;border-radius:8px;margin:10px 0;max-width:100%;overflow-x:auto;padding:12px}.message-content code{color:#e0e0e0;font-family:Consolas,Monaco,Andale Mono,monospace;font-size:.9rem}.message-content p code{background:#10121e66;border:1px solid #3f5efb1a;border-radius:4px;padding:2px 5px}.message-content ol,.message-content ul{margin:10px 0;padding-left:25px}.message-content li{margin-bottom:5px}.message-content table{border-collapse:collapse;display:block;margin:15px 0;overflow-x:auto;width:100%}.message-content td,.message-content th{border:1px solid #3f5efb33;padding:8px 12px;text-align:left}.message-content th{background:#3f5efb33;color:#fff}.message-tooltip{animation:fadeIn .3s ease-in;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background-color:#10121ef2;border:1px solid #3f5efb33;border-radius:8px;box-shadow:0 8px 25px #00000040;color:#fff;font-size:.9rem;left:calc(100% + 10px);max-width:250px;min-width:200px;padding:12px;position:absolute;top:0;width:max-content;z-index:100}.message-tooltip:before{border-bottom:6px solid #0000;border-right:6px solid #10121ef2;border-top:6px solid #0000;content:"";height:0;left:-6px;position:absolute;top:10px;width:0}.message-user .message-tooltip{left:auto;right:calc(100% + 10px)}.message-user .message-tooltip:before{border-left:6px solid #10121ef2;border-right:none;left:auto;right:-6px}.message-footer{align-items:center;display:flex;font-size:.7rem;gap:4px;justify-content:flex-end}.message-time{font-size:.7rem;opacity:.7}.message-status{font-size:.8rem}.message-status-delivered,.message-status-sent{color:#ffffffb3}.message-status-read{color:#4caf50}.message-translation-indicator{font-size:.8rem;margin-left:4px;opacity:.7;transition:opacity .3s ease}.message-bubble:hover .message-translation-indicator{opacity:1}@media (max-width:768px){.message-tooltip{bottom:75px;box-shadow:0 8px 25px #00000040;left:10px;max-width:none;position:fixed;right:10px;top:auto;width:auto;z-index:1000}.message-tooltip:before{display:none}.message-user .message-tooltip{left:10px;right:10px}}.message{align-items:flex-end;display:flex;gap:8px;margin-bottom:16px}.message-left{justify-content:flex-start}.message-right{justify-content:flex-end}.message-avatar{flex-shrink:0}.lesson-topics{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#10121e66;border:1px solid #3f5efb1a;border-radius:16px;box-shadow:0 8px 32px #0003;gap:8px;padding:15px}.topics-header{background:linear-gradient(90deg,#64b5f6,#9575cd);letter-spacing:.5px;margin-bottom:8px}.topic-list{gap:6px}.topic-item{background:#16182480;border:1px solid #0000;border-radius:8px;cursor:pointer;font-size:14px;font-weight:500;line-height:1.4;overflow:hidden;padding:8px 15px 8px 25px;transition:all .3s cubic-bezier(.25,.8,.25,1);-webkit-user-select:none;user-select:none}.topic-item:hover{background:#1e213ab3;border:1px solid #3f5efb4d;box-shadow:0 4px 15px #0000004d,0 0 10px #3f5efb33;color:#fff}.topic-item:active{background:#3f5efb33;box-shadow:0 0 8px #3f5efb66;transform:translateX(0) scale(.98)}.topic-item:after{content:"→";opacity:0;position:absolute;right:15px;transition:all .2s ease}.topic-item:hover:after{opacity:.8;transform:translateX(3px)}.topic-item:before{background:radial-gradient(circle at 30% 60%,#3f5efb1a 0,#0000 70%),radial-gradient(circle at 70% 40%,#4caf5014 0,#0000 70%);bottom:0;content:"";left:0;opacity:0;position:absolute;right:0;top:0;transition:opacity .3s ease;z-index:-1}.topic-item:hover:before{opacity:1}.topic-bullet{animation:sparkle-bullet 3s infinite alternate;background:linear-gradient(135deg,#64b5f6,#9575cd);left:10px}@keyframes sparkle-bullet{0%{box-shadow:0 0 5px #4caf5099;opacity:.8;transform:scale(1)}50%{box-shadow:0 0 15px #3f5efbcc;opacity:1;transform:scale(1.5)}to{box-shadow:0 0 5px #4caf5099;opacity:.8;transform:scale(1)}}.topic-hint{animation:fade-pulse 2s infinite alternate;font-size:13px;letter-spacing:.5px;margin-top:10px}@keyframes fade-pulse{0%{opacity:.6}to{opacity:1}}.message-list-container{display:flex;flex:1 1;flex-direction:column;overflow:hidden;padding:.5rem 0;position:relative}.message-list{flex:1 1;mask-image:linear-gradient(0deg,#0000,#000 10px);-webkit-mask-image:linear-gradient(0deg,#0000,#000 10px);overflow-x:hidden;overflow-y:auto;padding:0 .5rem;position:relative;scroll-behavior:smooth;scrollbar-color:#3f5efb66 #10121e66;scrollbar-width:thin}.message-list::-webkit-scrollbar{width:10px}.message-list::-webkit-scrollbar-track{background:#10121e66;border-radius:5px;margin:4px 0}.message-list::-webkit-scrollbar-thumb{background:linear-gradient(180deg,#3f5efb80,#833ab480,#fc466b80);background-clip:content-box;border:2px solid #0000;border-radius:5px}.message-list::-webkit-scrollbar-thumb:hover{background:linear-gradient(180deg,#3f5efbb3,#833ab4b3,#fc466bb3);background-clip:content-box}.topics-card-container{animation:fadeInUp .5s ease-out forwards;margin:.75rem 0}.topics-card-message{align-items:flex-start;display:flex;margin:.25rem 0;position:relative}.topics-card-message .message-avatar{margin-right:.75rem;margin-top:.5rem}.topics-card-message .message-bubble{background:#0000!important;border:none!important;box-shadow:none!important;max-width:90%;padding:0!important}.topics-card-message .message-content{padding:0;width:100%}.topics-card-message .lesson-topics{border:1px solid #3f5efb26;border-radius:14px;box-shadow:0 4px 20px #00000026;width:100%}.topics-card-message .message-time{bottom:10px;font-size:.75rem;opacity:.6;position:absolute;right:10px;z-index:10}.topics-bubble{background:#0000!important}.messages-typing-indicator{align-items:center;animation:fadeIn .3s ease-out forwards;display:flex;opacity:0;padding:.5rem 1.5rem;transition:opacity .3s ease-out}.message-date-separator{color:var(--text-color-medium);font-size:.85rem;letter-spacing:.5px;margin:1rem 0;text-transform:uppercase}.message-date-separator:after,.message-date-separator:before{background:linear-gradient(90deg,#0000,#fff3);background:linear-gradient(to var(--direction,right),#0000,#fff3);margin:0 .75rem}.message-date-separator:before{--direction:right}.message-date-separator:after{--direction:left}.scroll-to-bottom{align-items:center;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);background:#1e233cb3;border:1px solid #3f5efb33;border-radius:50%;bottom:1rem;box-shadow:0 4px 8px #0000004d;cursor:pointer;display:flex;height:40px;justify-content:center;opacity:0;position:absolute;right:1rem;transform:translateY(10px);transition:all .2s ease;width:40px;z-index:10}.scroll-to-bottom.visible{opacity:1;transform:translateY(0)}.scroll-to-bottom:hover{background:#1e233ce6;border-color:#3f5efb4d;box-shadow:0 6px 12px #0006;transform:translateY(-2px)}.scroll-to-bottom svg{stroke:var(--text-color-bright);stroke-width:2px;height:20px;transition:all .2s ease;width:20px}.scroll-to-bottom:hover svg{stroke:var(--accent-color);transform:translateY(2px)}@media (max-width:768px){.message-list-container{padding:.25rem 0}.message-list{padding:0 .25rem}.message-date-separator{font-size:.8rem;margin:.75rem 0}.scroll-to-bottom{bottom:.75rem;height:36px;right:.75rem;width:36px}.topics-card-message .lesson-topics{padding:12px}.topics-card-message .message-bubble{max-width:100%}}.message-date-separator{align-items:center;display:flex;justify-content:center;margin:16px 0;position:relative}.message-date-separator:after,.message-date-separator:before{background:linear-gradient(90deg,#0000,#3f5efb4d,#0000);content:"";flex:1 1;height:1px}.message-date{-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);background-color:#3f5efb1a;border:1px solid #3f5efb1a;border-radius:12px;color:#ffffffb3;font-size:.75rem;margin:0 12px;padding:6px 14px;z-index:1}.typing-indicator{align-items:center;background-color:#161824b3;border:1px solid #3f5efb1a;border-radius:18px;border-bottom-left-radius:4px;box-shadow:0 4px 12px #0000001a;display:flex;height:35px;margin:10px 0;padding:10px 15px;width:fit-content}.typing-bubble{animation:typing-animation 1.5s ease-in-out infinite;background-color:#3f5efbcc;border-radius:50%;height:8px;margin:0 2px;width:8px}.typing-bubble:first-child{animation-delay:0s}.typing-bubble:nth-child(2){animation-delay:.3s}.typing-bubble:nth-child(3){animation-delay:.6s}@keyframes typing-animation{0%,60%,to{opacity:.8;transform:translateY(0)}30%{opacity:1;transform:translateY(-5px)}}.text-input-container{position:relative;width:100%}.text-input{background:#fff;border:1px solid #e0e0e0;border-radius:24px;font-size:.95rem;outline:none;padding:12px 16px;transition:border-color .3s,box-shadow .3s;width:100%}.text-input:focus{border-color:#002395;box-shadow:0 0 0 2px #00239533}.text-input-multiline{min-height:60px;resize:none}.text-input-with-icon .text-input{padding-left:40px}.text-input-icon-right .text-input{padding-left:16px;padding-right:40px}.text-input-icon{color:#888;position:absolute;top:50%;transform:translateY(-50%)}.text-input-icon-left .text-input-icon{left:12px}.text-input-icon-right .text-input-icon{right:12px}.chat-footer{align-items:center;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#10121ef2;border-top:1px solid #3f5efb26;display:flex;padding:15px 20px;position:relative}.chat-footer:before{background:linear-gradient(90deg,#3f5efb00,#3f5efb4d 50%,#3f5efb00);content:"";height:1px;left:0;position:absolute;right:0;top:0;z-index:2}.message-input{background:#161824b3;border:1px solid #3f5efb33;border-radius:20px;color:#fff;flex:1 1;font-size:.95rem;margin-right:10px;outline:none;padding:12px 15px;transition:all .3s ease}.message-input:focus{background:#1e213acc;border-color:#3f5efb66;box-shadow:0 0 0 2px #3f5efb1a}.message-input::placeholder{color:#fff6}.send-button{align-items:center;background:linear-gradient(135deg,#3f5efb,#fc466b);border:none;border-radius:50%;box-shadow:0 4px 12px #3f5efb4d;color:#fff;cursor:pointer;display:flex;font-size:1.2rem;height:42px;justify-content:center;transition:all .3s ease;width:42px}.send-button:hover{box-shadow:0 6px 15px #3f5efb66;transform:translateY(-2px)}.send-button:active{box-shadow:0 2px 5px #3f5efb66;transform:translateY(1px)}.send-button:disabled{box-shadow:none;cursor:not-allowed;opacity:.5;transform:none}.record-button{align-items:center;background:#161824b3;border:1px solid #3f5efb33;border-radius:50%;color:#fffc;cursor:pointer;display:flex;font-size:1.2rem;height:42px;justify-content:center;margin-right:10px;transition:all .3s ease;width:42px}.record-button.recording{animation:pulse 1.5s infinite;background:linear-gradient(135deg,#fc466bcc,#fc466be6);border-color:#fc466b66;color:#fff}@keyframes pulse{0%{box-shadow:0 0 0 0 #fc466b80}70%{box-shadow:0 0 0 10px #fc466b00}to{box-shadow:0 0 0 0 #fc466b00}}.record-button:hover:not(.recording){background:#1e213acc;border-color:#3f5efb66;transform:translateY(-2px)}.record-button:active:not(.recording){transform:translateY(1px)}.footer-icon{font-size:1.1rem}@media (max-width:768px){.chat-footer{padding:12px 15px}.message-input{font-size:.9rem;padding:10px}.record-button,.send-button{font-size:1rem;height:38px;width:38px}}.api-key-form{background-color:#0000000d;border-radius:8px;margin-bottom:20px;padding:15px}.api-key-label{display:block;margin-bottom:10px}.api-key-input-container{display:flex;gap:10px;margin-bottom:10px}.api-key-input{flex-grow:1}.api-key-info{color:#666;font-style:italic}.api-key-display{align-items:center;display:flex;justify-content:space-between}.chat-template{backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);background:#0a0c18bf;border-radius:12px;display:flex;flex-direction:column;height:100%;overflow:hidden;position:relative;width:100%}.chat-header-container{position:relative;z-index:20}.chat-content{margin:0;padding:.75rem;z-index:10}.chat-content,.chat-content-inner{display:flex;flex:1 1;flex-direction:column;overflow:hidden;position:relative}.chat-content-spacer{height:.25rem}.chat-instructions{animation:fadeInUp .5s ease-out forwards;backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);background:#1e233c99;border:1px solid #3f5efb1a;border-radius:12px;box-shadow:0 4px 15px #00000026;margin:.25rem auto .75rem;max-width:95%;opacity:0;overflow:hidden;padding:1.25rem;position:relative;transform:translateY(20px);width:100%;z-index:5}.chat-instructions h3{color:var(--text-color-bright);font-size:1.1rem;letter-spacing:.5px;margin-bottom:.75rem;margin-top:0}.chat-instructions p{color:var(--text-color-medium);font-size:.95rem;line-height:1.5;margin:.5rem 0}.chat-instructions:before{background:linear-gradient(135deg,#3f5efb0d,#fc466b0d);content:"";height:100%;left:0;position:absolute;top:0;width:100%;z-index:-1}.chat-instructions:after{animation:shimmer 8s linear infinite;background:linear-gradient(45deg,#0000,#3f5efb1a 25%,#0000 50%,#fc466b1a 75%,#0000);content:"";height:200%;left:-50%;opacity:.7;position:absolute;top:-50%;transform:rotate(45deg);width:200%;z-index:-1}.chat-footer-container{position:relative;z-index:20}.chat-content{scrollbar-color:#3f5efb33 #1e1e321a;scrollbar-width:thin}.chat-content::-webkit-scrollbar{width:8px}.chat-content::-webkit-scrollbar-track{background:#1414281a;border-radius:4px}.chat-content::-webkit-scrollbar-thumb{background:linear-gradient(180deg,#3f5efb4d,#fc466b4d);background-clip:content-box;border:2px solid #0000;border-radius:4px}.chat-content::-webkit-scrollbar-thumb:hover{background:linear-gradient(180deg,#3f5efb80,#fc466b80);background-clip:content-box}.chat-error-container{animation:fadeIn .3s ease-out;background:#dc323226;border:1px solid #dc32324d;border-radius:8px;margin:1rem auto;max-width:90%;padding:1rem}.chat-error-container h4{color:#f55;margin-bottom:.5rem;margin-top:0}.chat-error-container p{color:#f0f0f0;margin:.5rem 0}.retry-button{background:linear-gradient(45deg,#f55,#f33);border:none;border-radius:4px;color:#fff;cursor:pointer;font-weight:500;margin-top:.75rem;padding:.5rem 1rem;transition:all .2s ease}.retry-button:hover{background:linear-gradient(45deg,#f33,red);box-shadow:0 3px 10px #f003;transform:translateY(-1px)}.topics-container-wrapper{margin-bottom:.5rem}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes shimmer{0%{transform:translateX(-150%) translateY(-150%) rotate(45deg)}to{transform:translateX(150%) translateY(150%) rotate(45deg)}}@media (max-width:768px){.chat-instructions{margin:.5rem auto;padding:1rem}.chat-instructions h3{font-size:1rem}.chat-instructions p{font-size:.9rem}.chat-content{padding:.5rem}}.chat-instructions-enter{opacity:0;transform:translateY(20px)}.chat-instructions-enter-active{transition:opacity .3s,transform .3s}.chat-instructions-enter-active,.chat-instructions-exit{opacity:1;transform:translateY(0)}.chat-instructions-exit-active{opacity:0;transform:translateY(-20px);transition:opacity .3s,transform .3s}.chat-floating-models{height:100%;opacity:.8;pointer-events:none;position:absolute;width:100%;z-index:30}.chat-instructions .close-button{background:none;border:none;color:#757575;cursor:pointer;font-size:1.2rem;position:absolute;right:.5rem;top:.5rem}.chat-instructions .close-button:hover{color:#fff}.lesson-topics{display:flex;flex-direction:column;gap:12px;overflow:hidden;position:relative}.topics-header{-webkit-text-fill-color:#0000;background:linear-gradient(90deg,#4caf50,#2196f3);-webkit-background-clip:text;font-size:18px;font-weight:600;margin-bottom:12px;text-align:center;text-shadow:0 0 10px #4caf504d}.topic-list{display:flex;flex-direction:column;gap:8px;list-style-type:none;margin:0;padding:0}.topic-item{align-items:center;color:#e0e0e0;display:flex;font-size:15px;line-height:1.5;padding-left:20px;position:relative;transition:transform .2s ease;z-index:1}.topic-item:hover{color:#4caf50;transform:translateX(5px)}.topic-bullet{animation:pulse-bullet 2s infinite alternate;background:linear-gradient(135deg,#4caf50,#2196f3);border-radius:50%;box-shadow:0 0 10px #4caf5099;height:8px;left:0;margin-right:12px;position:absolute;width:8px}@keyframes pulse-bullet{0%{opacity:.8;transform:scale(1)}to{opacity:1;transform:scale(1.3)}}.topic-hint{color:#bdbdbd;font-size:14px;font-style:italic;margin-top:12px;text-align:center}.chat-api-key-container,.chat-pdf-required{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#161824b3;border:1px solid #3f5efb1a;border-radius:12px;color:#e0e0e0;margin:2rem auto;max-width:600px;padding:2rem}.env-instructions{display:flex;flex-direction:column;gap:1rem}.code-block{background:#10121ecc;border:1px solid #3f5efb1a;border-radius:6px;color:#e0e0e0;font-family:Courier New,monospace;overflow-x:auto;padding:1rem}.chat-error{color:#ff5252}.chat-error,.chat-loading{margin:1rem 0;text-align:center}.chat-loading{color:#e0e0e0}.loading-dots:after{animation:dots 1.5s steps(5) infinite;content:"."}@keyframes dots{0%,20%{content:"."}40%{content:".."}60%{content:"..."}80%,to{content:""}}.chat-page{align-items:center;background-color:var(--dark-bg);display:flex;flex-direction:column;height:100vh;justify-content:flex-start;overflow:hidden;padding-top:10px;position:relative;width:100%}@supports (height:100dvh){.chat-page{height:100dvh}}@media not all and (-webkit-min-device-pixel-ratio:0),not all and (min-resolution:.001dpcm){@supports (-webkit-appearance:none){.chat-page{height:-webkit-fill-available}}}.chat-container{border-radius:20px;height:calc(100vh - 40px);margin:5px auto;max-height:800px;max-width:1080px;overflow:hidden;position:relative;width:95%;z-index:10}@supports (height:100dvh){.chat-container{height:calc(100dvh - 40px)}}.chat-page-models{height:100%;left:0;pointer-events:none;position:absolute;top:0;width:100%;z-index:5}.chat-page-models .floating-character-model{pointer-events:auto}.interview-mode,.tutor-mode{position:relative}.tutor-mode{background:linear-gradient(180deg,#1a1b2a,#0a0b15)}.stars{height:100%;left:0;overflow:hidden;top:0;width:100%;z-index:1}.star,.stars{position:absolute}.star{animation:twinkle 5s infinite;background:#fffc;border-radius:50%;box-shadow:0 0 4px 1px #ffffffb3;height:2px;width:2px}.star:first-child{animation-delay:.5s;left:20%;top:10%}.star:nth-child(2){animation-delay:1s;left:85%;top:30%}.star:nth-child(3){animation-delay:1.5s;left:10%;top:65%}.star:nth-child(4){animation-delay:2s;left:70%;top:80%}.star:nth-child(5){animation-delay:2.5s;left:30%;top:45%}.star:nth-child(6){animation-delay:3s;left:60%;top:15%}.star:nth-child(7){animation-delay:3.5s;left:40%;top:90%}.star:nth-child(8){animation-delay:4s;left:90%;top:50%}.star:nth-child(9){animation-delay:4.5s;left:5%;top:25%}.star:nth-child(10){animation-delay:5s;left:50%;top:70%}@keyframes twinkle{0%{opacity:.2;transform:scale(.8)}50%{opacity:1;transform:scale(1.2)}to{opacity:.2;transform:scale(.8)}}.interview-mode{background:linear-gradient(180deg,#1e1e2e,#131320)}@media (max-width:768px){.chat-container{height:calc(100vh - 20px);margin:5px auto;max-height:none;width:98%}@supports (height:100dvh){.chat-container{height:calc(100dvh - 20px)}}}@media (max-width:480px){.chat-container{border-radius:15px;height:100vh;margin:0;width:100%}@supports (height:100dvh){.chat-container{height:100dvh}}.chat-page{padding-top:0}}.chinese-character-model{align-items:center;background-color:#fffc;border-radius:var(--border-radius-lg);box-shadow:var(--shadow-md);display:flex;flex-direction:column;margin:15px;max-width:300px;padding:20px;transition:transform .3s ease}.chinese-character-model:hover{box-shadow:var(--shadow-lg);transform:translateY(-5px)}.character-info{margin-bottom:15px;text-align:center;width:100%}.character{color:var(--primary-color);font-size:3rem;margin-bottom:5px}.pinyin{color:var(--secondary-color);font-size:1.2rem;margin-bottom:5px}.meaning{color:var(--neutral-medium);font-size:1rem}.character-model{border:1px solid #f5c6424d;border-radius:var(--border-radius-md);overflow:hidden}@media (max-width:768px){.chinese-character-model{max-width:100%;padding:15px}.character{font-size:2.5rem}}.character-gallery{margin:0 auto;max-width:1200px;padding:30px 15px}.gallery-title{margin-bottom:30px;text-align:center}.gallery-grid{grid-gap:20px;display:grid;gap:20px;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));justify-items:center}@media (max-width:768px){.character-gallery{padding:20px 10px}.gallery-grid{gap:15px;grid-template-columns:repeat(auto-fill,minmax(180px,1fr))}}.models-page{background:linear-gradient(135deg,#c3272b0d,#f5c6421a);min-height:100vh;padding:20px}.models-header{margin:0 auto 40px;max-width:800px;position:relative;text-align:center}.back-button{top:0}.page-title{color:var(--primary-color);font-size:2rem;margin-bottom:15px}.page-description{color:var(--neutral-medium);margin:0 auto;max-width:600px}@media (max-width:768px){.models-header{margin-top:50px;padding-top:20px}.back-button{display:block;margin-bottom:20px;margin-left:auto;margin-right:auto;position:relative}}.chapters-page{background:#0c0e18;color:#fff;height:auto;min-height:100vh;overflow:hidden;padding:2rem 2rem 6rem;position:relative}.gradient-overlay{background:radial-gradient(circle at 15% 50%,#3f5efb33 0,#3f5efb00 25%),radial-gradient(circle at 85% 30%,#fc466b33 0,#fc466b00 25%),radial-gradient(circle at 75% 80%,#833ab433 0,#833ab400 30%),radial-gradient(circle at 25% 75%,#1de9b633 0,#1de9b600 20%)}.gradient-overlay,.grid-pattern{height:100%;left:0;pointer-events:none;position:absolute;top:0;width:100%;z-index:0}.grid-pattern{background-image:linear-gradient(hsla(0,0%,100%,.025) 1px,#0000 0),linear-gradient(90deg,hsla(0,0%,100%,.025) 1px,#0000 0);background-size:40px 40px}.chapters-page:after,.chapters-page:before{border-radius:50%;content:"";opacity:.15;pointer-events:none;position:absolute;z-index:0}.chapters-page:before{animation:float-slow 25s ease-in-out infinite alternate;background:radial-gradient(circle,#3f5efbb3 0,#3f5efb00 70%);height:600px;right:-150px;top:-200px;width:600px}.chapters-page:after{animation:float-slow 20s ease-in-out infinite alternate-reverse;background:radial-gradient(circle,#fc466bb3 0,#fc466b00 70%);bottom:-150px;height:500px;left:-100px;width:500px}@keyframes float-slow{0%{transform:translate(0) scale(1)}50%{transform:translate(50px,30px) scale(1.1)}to{transform:translate(-20px,50px) scale(.9)}}.chapters-header{margin-bottom:2.5rem;position:relative;text-align:center;z-index:1}.back-button{align-items:center;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);background:#3f5efb26;border:1px solid #3f5efb4d;border-radius:8px;box-shadow:0 2px 8px #0000004d;color:#fff;cursor:pointer;display:flex;font-size:.95rem;font-weight:600;left:0;letter-spacing:.5px;padding:.7rem 1.3rem;position:absolute;text-transform:uppercase;top:80%;transition:all .3s}.back-button:hover{background:#3f5efb40;box-shadow:0 4px 12px #3f5efb66;transform:translateY(-2px)}.back-button:active{box-shadow:0 2px 4px #3f5efb66;transform:translateY(1px)}.chapters-title{background:linear-gradient(90deg,#3f5efb,#fc466b);-webkit-background-clip:text;background-clip:text;color:#0000;font-size:2.5rem;font-weight:700;margin-bottom:.8rem;text-shadow:0 2px 4px #0000004d}.chapters-subtitle{color:#fffc;font-size:1.2rem;margin:0 auto;max-width:600px;opacity:.9}.chapters-floating-models{height:100%;left:0;pointer-events:none;position:fixed!important;top:0;width:100%;z-index:10}.chapters-floating-models .floating-character-model{pointer-events:auto}.chapters-container{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#10121ecc;border:1px solid #3f5efb1a;border-radius:16px;box-shadow:0 8px 32px #00000040;height:auto;margin:0 auto 4rem;max-width:1200px;overflow:visible;padding:2.5rem;position:relative;z-index:5}.category-section{margin-bottom:2.5rem;overflow:visible}.category-section:last-child{margin-bottom:80px;padding-bottom:40px}.category-title{align-items:center;background:#10121ee6;border-bottom:1px solid #3f5efb33;color:#fffffff2;display:flex;font-size:1.6rem;margin-bottom:1.2rem;padding-bottom:.7rem;padding-top:.5rem;position:sticky;text-shadow:0 1px 3px #0003;top:0;z-index:2}.category-title:before{background:linear-gradient(90deg,#3f5efb,#fc466b);border-radius:50%;content:"";display:inline-block;height:10px;margin-right:12px;width:10px}.chapters-grid{grid-gap:1.2rem;display:grid;gap:1.2rem;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));margin-top:1rem;overflow:visible}.chapter-card{display:flex;flex-direction:column;height:auto;overflow:visible;transition:all .3s ease}.chapter-card.expanded{height:auto}.chapter-button{align-items:center;background:#141728f2;border:1px solid #3f5efb33;border-radius:10px;box-shadow:0 4px 12px #0003;color:#fff;cursor:pointer;display:flex;overflow:hidden;padding:1.2rem;position:relative;transition:all .3s ease}.chapter-button:after{background:linear-gradient(90deg,#3f5efb1a,#fc466b1a);content:"";height:100%;left:0;position:absolute;top:0;transition:width .4s ease;width:0;z-index:0}.chapter-button:hover{background:#1e213af2;border-color:#3f5efb66;box-shadow:0 8px 20px #3f5efb26;transform:translateY(-4px)}.chapter-button:hover:after{width:100%}.chapter-button:active{box-shadow:0 4px 8px #3f5efb33;transform:translateY(-1px)}.chapter-number{align-items:center;background:linear-gradient(135deg,#3f5efb,#fc466b);border-radius:8px;box-shadow:0 2px 6px #0003;color:#fff;display:flex;flex-shrink:0;font-size:1.2rem;font-weight:700;height:40px;justify-content:center;margin-right:1.2rem;position:relative;width:40px;z-index:1}.chapter-title{color:#fff;flex:1 1;font-size:1rem;font-weight:500;line-height:1.4;margin:0;overflow:hidden;text-overflow:ellipsis;transition:color .3s ease}.expand-icon{align-items:center;background:#3f5efb1a;border-radius:50%;display:flex;flex-shrink:0;font-weight:700;height:22px;justify-content:center;margin-left:.8rem;transition:all .3s ease;width:22px}.chapter-card.expanded .expand-icon{background:#fc466b26}.chapter-topics{animation:slideDown .3s ease forwards;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);background:#1e213a66;border:1px solid #3f5efb26;border-radius:0 0 10px 10px;border-top:none;box-shadow:0 4px 12px #00000026;margin-top:-5px;overflow:visible;padding:1.2rem;z-index:0}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.chapter-topics h4{align-items:center;color:#fc466b;display:flex;font-size:1.1rem;font-weight:600;justify-content:space-between;margin-bottom:.8rem;margin-top:0}.chapter-topics .start-learning-btn{align-items:center;background:linear-gradient(135deg,#3f5efb,#fc466b);border:none;border-radius:6px;box-shadow:0 4px 8px #3f5efb4d;color:#fff;cursor:pointer;display:inline-flex;font-size:.85rem;font-weight:600;height:auto;justify-content:center;letter-spacing:.5px;margin-top:0;min-height:0;min-height:auto;overflow:hidden;padding:.5rem .8rem;position:relative;text-transform:uppercase;transition:all .3s ease}.chapter-topics .start-learning-btn:hover{box-shadow:0 6px 12px #3f5efb80;transform:translateY(-2px)}.chapter-topics ul{list-style-type:none;margin-bottom:1.2rem;padding-left:0}.chapter-topics li{align-items:center;border-bottom:1px solid #ffffff0d;color:#ffffffd9;display:flex;font-size:.95rem;padding:.5rem 0}.chapter-topics li:before{color:#3f5efb;content:"→";font-weight:700;margin-right:.5rem}.chapter-topics li:last-child{border-bottom:none}.start-learning-btn{align-items:center;background:linear-gradient(135deg,#3f5efb,#fc466b);border:none;border-radius:6px;box-shadow:0 4px 15px #3f5efb4d;color:#fff;cursor:pointer;display:inline-flex;font-size:.9rem;font-weight:600;justify-content:center;letter-spacing:.5px;margin-top:0;overflow:hidden;padding:.6rem 1rem;position:relative;text-transform:uppercase;transition:all .3s ease}.start-learning-btn:after{background:linear-gradient(90deg,#fff0,#fff3 50%,#fff0);content:"";height:100%;left:-100%;position:absolute;top:0;transition:left .6s ease;width:100%}.start-learning-btn:hover{box-shadow:0 6px 20px #3f5efb80;transform:translateY(-2px)}.start-learning-btn:hover:after{left:100%}.start-learning-btn:active{box-shadow:0 2px 5px #3f5efb66;transform:translateY(1px)}@media (max-width:768px){.chapters-grid{grid-template-columns:1fr;overflow:visible}.chapters-page{height:auto;padding:1.5rem 1.5rem 4rem}.chapters-container{height:auto;overflow:visible;padding:1.5rem}.chapters-title{font-size:2rem;margin-top:1.5rem}.back-button{display:inline-block;margin-bottom:1rem;position:relative}.chapters-header{align-items:center;display:flex;flex-direction:column;text-align:center}.chapter-card.expanded{grid-row-end:auto;height:auto}}.chapters-page .category-section,.chapters-page .chapters-container,.chapters-page .chapters-grid{position:relative;z-index:5}body,html{overflow-x:hidden;overflow-y:auto!important}#root,body,html{height:auto;min-height:100vh}#root{overflow:hidden}.category-section,.chapter-card,.chapter-topics,.chapters-container,.chapters-grid{overflow:visible}.App{min-height:100vh;width:100%}*{box-sizing:border-box;margin:0;padding:0}body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:#0c0e18;background:var(--dark-bg);color:#fff;color:var(--white);font-family:Inter,Roboto,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-family:var(--font-sans);line-height:1.6;overflow:hidden;scroll-behavior:smooth}:root{--primary:#3f5efb;--primary-light:#536dfe;--primary-dark:#3949ab;--secondary:#fc466b;--secondary-light:#ff5c8a;--secondary-dark:#e91e63;--accent:#1de9b6;--accent-light:#64ffda;--accent-dark:#00bfa5;--gradient-main:linear-gradient(135deg,var(--primary),var(--secondary));--gradient-alt:linear-gradient(135deg,#4e4376,#2b5876);--dark-bg:#0c0e18;--dark-surface:#10121ecc;--dark-surface-light:#16182480;--white:#fff;--light-grey:#e0e0e0;--medium-grey:#9e9e9e;--dark-grey:#424242;--black:#141414;--error:#ff5252;--warning:#fb8c00;--success:#4caf50;--shadow-sm:0 2px 4px #0000001a;--shadow-md:0 4px 8px #0000001f;--shadow-lg:0 8px 16px #00000024;--shadow-xl:0 12px 24px #00000029;--border-radius-sm:4px;--border-radius-md:8px;--border-radius-lg:12px;--border-radius-xl:16px;--border-radius-xxl:20px;--font-sans:"Inter","Roboto",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;--font-mono:"Roboto Mono","Consolas",monospace;--transition-fast:0.15s ease;--transition-normal:0.3s ease;--transition-slow:0.6s ease;--size-xs:0.75rem;--size-sm:0.875rem;--size-md:1rem;--size-lg:1.125rem;--size-xl:1.25rem;--size-2xl:1.5rem;--size-3xl:1.875rem;--size-4xl:2.25rem;--size-5xl:3rem}.App:before{background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg width='100' height='100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M50 50H0L50 0v50Z' fill='%23C3272B' fill-opacity='.02'/%3E%3Cpath d='M50 50h50l-50 50V50Z' fill='%23F5C642' fill-opacity='.02'/%3E%3C/svg%3E");background-position:50%;background-size:cover;content:"";height:100%;left:0;opacity:.8;position:fixed;top:0;width:100%;z-index:-1}.glass-card{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#10121ecc;background:var(--dark-surface);border:1px solid #3f5efb1a;border-radius:16px;border-radius:var(--border-radius-xl);box-shadow:0 8px 16px #00000024;box-shadow:var(--shadow-lg);overflow:hidden;position:relative}.glass-card:before{background:linear-gradient(90deg,#fff0,#3f5efb80 50%,#fff0);content:"";height:1px;left:-100%;position:absolute;top:0;width:200%;z-index:1}.btn{align-items:center;border:none;border-radius:8px;border-radius:var(--border-radius-md);cursor:pointer;display:inline-flex;font-weight:600;justify-content:center;letter-spacing:.5px;overflow:hidden;padding:.75rem 1.5rem;position:relative;text-transform:uppercase;transition:.3s ease;transition:var(--transition-normal)}.btn:after{background:linear-gradient(90deg,#fff0,#fff3 50%,#fff0);content:"";height:100%;left:-100%;position:absolute;top:0;transition:left .6s ease;width:100%}.btn:hover:after{left:100%}.btn:disabled{cursor:not-allowed;opacity:.6}.btn-primary{background:linear-gradient(135deg,#3f5efb,#fc466b);background:var(--gradient-main);box-shadow:0 4px 15px #3f5efb4d;color:#fff;color:var(--white)}.btn-primary:hover{box-shadow:0 6px 20px #3f5efb80;transform:translateY(-2px)}.btn-secondary{background:linear-gradient(135deg,#4e4376,#2b5876);background:var(--gradient-alt);box-shadow:0 4px 15px #2b58764d;color:#fff;color:var(--white)}.btn-secondary:hover{box-shadow:0 6px 20px #2b587680;transform:translateY(-2px)}.btn-outline{background:#10121e66;border:1px solid #fff3;color:#fff;color:var(--white)}.btn-outline:hover{background:#3f5efb1a;border-color:#3f5efb66;transform:translateY(-2px)}.heading-xl{font-size:3rem;font-size:var(--size-5xl);font-weight:800;letter-spacing:-.5px;line-height:1.2}.heading-lg{font-size:2.25rem;font-size:var(--size-4xl);line-height:1.25}.heading-lg,.heading-md{font-weight:700;letter-spacing:-.3px}.heading-md{font-size:1.875rem;font-size:var(--size-3xl);line-height:1.3}.heading-sm{font-size:1.5rem;font-size:var(--size-2xl);font-weight:600;line-height:1.4}.body-lg{font-size:1.25rem;font-size:var(--size-xl);line-height:1.6}.body-md{font-size:1rem;font-size:var(--size-md);line-height:1.6}.body-sm{font-size:.875rem;font-size:var(--size-sm);line-height:1.6}.caption{font-size:.75rem;font-size:var(--size-xs);letter-spacing:.4px;line-height:1.5}.text-gradient{background:linear-gradient(135deg,#3f5efb,#fc466b);background:var(--gradient-main);-webkit-background-clip:text;background-clip:text;color:#0000}@media (max-width:768px){.heading-xl{font-size:2.5rem}.heading-lg{font-size:2rem}.heading-md{font-size:1.5rem}}.App-logo{height:40vmin;pointer-events:none}@media (prefers-reduced-motion:no-preference){.App-logo{animation:App-logo-spin 20s linear infinite}}.App-header{align-items:center;background:linear-gradient(135deg,#002395,#001852);color:#fff;display:flex;flex-direction:column;justify-content:center;min-height:100vh;padding:20px}h1{color:#fff;font-size:3.5rem;margin-bottom:.5rem}.subtitle{color:#ed2939;font-size:1.5rem;font-weight:300;margin-bottom:3rem}.features{display:flex;flex-wrap:wrap;gap:30px;justify-content:center;margin-bottom:3rem;max-width:1000px}.feature{background-color:#ffffff1a;border-radius:10px;padding:25px;transition:transform .3s ease;width:250px}.feature:hover{transform:translateY(-10px)}.feature-icon{display:block;font-size:3rem;margin-bottom:15px}.feature h3{color:#fff;font-size:1.3rem;margin-bottom:10px}.feature p{color:#fffc;font-size:.95rem}.cta-button{background-color:#ed2939;border:none;border-radius:30px;box-shadow:0 4px 15px #ed293980;color:#fff;cursor:pointer;font-size:1.2rem;font-weight:700;padding:15px 30px;transition:all .3s ease}.cta-button:hover{background-color:#ff3a4c;transform:scale(1.05)}@media (max-width:768px){h1{font-size:2.5rem}.subtitle{font-size:1.2rem}.features{align-items:center;flex-direction:column}.feature{max-width:300px;width:100%}}.App-link{color:#61dafb}@keyframes App-logo-spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}
/*# sourceMappingURL=main.0e8181d2.css.map*/