.intro-video-container{position:fixed;top:0;left:0;width:100%;height:100%;z-index:9999;background-color:#000;display:flex;justify-content:center;align-items:center;transition:opacity 1s ease-out}.intro-video-container.fading-out{opacity:0;pointer-events:none}.intro-video{width:100%;height:100%;object-fit:cover}.skip-button{position:absolute;top:20px;right:20px;background:#00000080;color:#fff;border:1px solid rgba(255,255,255,.3);padding:8px 16px;border-radius:20px;cursor:pointer;font-size:.9rem;z-index:10000;transition:background .2s}.skip-button:hover{background:#000000b3}.controls-container{display:flex;border:1px solid var(--border-color);border-radius:16px;overflow:hidden;width:72px;height:32px;background-color:transparent}.control-button{display:flex;justify-content:center;align-items:center;flex:1;background-color:transparent;border:none;cursor:pointer;transition:background-color .2s ease-in-out;padding:0}.control-button:not(.selected):hover{background-color:var(--light-grey)}.thumb-icon{width:60%;height:60%;object-fit:contain;opacity:.5;filter:grayscale(1) brightness(2) contrast(.5);transition:transform .2s ease-in-out,opacity .2s ease-in-out,filter .2s ease-in-out}.control-button.selected .thumb-icon{opacity:1;filter:none;transform:scale(1.15)}.control-button:first-child{border-right:1px solid var(--border-color)}.control-button.selected .thumb-icon{opacity:1}.control-button.grade-success.selected .thumb-icon{filter:invert(30%) sepia(80%) saturate(1000%) hue-rotate(80deg) brightness(1.2)}.control-button.grade-fail.selected .thumb-icon{filter:invert(30%) sepia(80%) saturate(1500%) hue-rotate(330deg) brightness(1.2)}@media(prefers-color-scheme:dark){.thumb-icon{filter:invert(1) grayscale(1) brightness(.8) contrast(.5)}.control-button.selected .thumb-icon{filter:invert(1)}.control-button.grade-success.selected .thumb-icon{filter:invert(30%) sepia(80%) 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h3{font-size:1.4rem;font-weight:600;color:var(--text-color);margin-top:1.5rem;margin-bottom:.5rem}.how-it-works-title{margin-top:4.5rem!important;text-align:center}.get-started-button{background-color:#2f855a;color:#fff;border:none;border-radius:8px;padding:1rem 2.5rem;font-size:1.2rem;font-weight:700;cursor:pointer;transition:background-color .2s ease,transform .1s ease;box-shadow:0 4px 6px #0000001a;display:block;margin:1.25rem auto 0}.get-started-button:hover{background-color:#276749;box-shadow:0 6px 8px #00000026}.get-started-button:active{background-color:#22543d;transform:translateY(1px)}.faq-container{background-color:var(--card-background);border:1px solid var(--border-color);border-radius:12px;padding:2rem 2rem 3rem;box-shadow:0 4px 12px #00000014;position:relative}.faq-header{display:flex;align-items:center;margin-bottom:0}.faq-header h2{flex-grow:1;text-align:center;margin-top:.5rem;margin-bottom:2rem;color:var(--primary-color);font-size:1.8rem;line-height:1.2}.faq-back-button{position:absolute;right:1rem;top:1rem;background:var(--card-background);border:1px solid var(--border-color);border-radius:50%;width:40px;height:40px;color:var(--text-color);font-size:2rem;line-height:1;font-weight:300;cursor:pointer;display:flex;justify-content:center;align-items:center;transition:transform .1s ease,background-color .2s ease;padding-bottom:6px}.faq-back-button:hover{background-color:var(--border-color);transform:scale(1.05)}.faq-back-button:active{transform:scale(.95)}.faq-list{display:flex;flex-direction:column}.faq-item{max-width:680px;margin:0 auto;width:100%}.faq-item h3{margin:1.75rem 0 .5rem;color:var(--text-color);font-size:1.2rem;font-weight:600}.faq-item p{margin:0 0 1rem;color:var(--subtle-text-color);line-height:1.6}.faq-item ul{margin:.5rem 0 .75rem;padding-left:1.5rem;color:var(--subtle-text-color);line-height:1.6}.faq-item ul li{margin-bottom:.5rem}.faq-item a{color:var(--primary-color);text-decoration:none}.faq-item a:hover{text-decoration:underline}.faq-item .email-link-paragraph{margin-top:-.75rem}.language-selector-container{display:flex;align-items:center;gap:0;background-color:#00000080;padding:6px 10px;border-radius:6px;color:#fff;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;font-size:.85rem;width:140px;box-sizing:border-box}.learning-label{font-size:1em;font-weight:700}.language-select{background-color:transparent;color:#fff;border:none;font-size:1em;font-weight:700;cursor:pointer;font-family:inherit;padding:0;width:100%;text-overflow:ellipsis}.language-select option{background-color:var(--card-background);color:var(--text-color)}.difficulty-selector-container{display:flex;align-items:center;background-color:#00000080;padding:6px 10px;border-radius:6px;color:#fff;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;font-size:.85rem;width:140px;box-sizing:border-box}.difficulty-select{background-color:transparent;color:#fff;border:none;font-size:1em;font-weight:700;cursor:pointer;font-family:inherit;padding:0;width:100%}.difficulty-select option{background-color:var(--card-background);color:var(--text-color)}.difficulty-select optgroup{background-color:var(--card-background);font-style:normal;font-weight:400}.auth-modal-backdrop{position:fixed;inset:0;background:#ffffffd9;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:1000;padding:1rem;opacity:0;animation:fadeIn .2s ease-out forwards}@media(prefers-color-scheme:dark){.auth-modal-backdrop{background:#000000b3}}.auth-modal-backdrop.closing{animation:fadeOut .2s ease-out forwards}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes fadeOut{0%{opacity:1}to{opacity:0}}.auth-modal{background:var(--bg-primary, #ffffff);border-radius:12px;padding:2rem;max-width:400px;width:100%;position:relative;box-shadow:0 4px 20px #00000026;transform:scale(.95);opacity:0;animation:modalIn .2s ease-out forwards}.auth-modal-backdrop.closing .auth-modal{animation:modalOut .2s ease-out forwards}@keyframes modalIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}@keyframes modalOut{0%{opacity:1;transform:scale(1)}to{opacity:0;transform:scale(.95)}}@media(prefers-color-scheme:dark){.auth-modal{background:var(--bg-primary, #1a1a1a)}}.auth-modal-close{position:absolute;top:1rem;right:1rem;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--text-secondary, #666);line-height:1;padding:.25rem}.auth-modal-close:hover{color:var(--text-primary, #333)}.auth-modal-title{margin:0 0 1.5rem;font-size:1.5rem;font-weight:600;color:var(--text-primary, #333)}@media(prefers-color-scheme:dark){.auth-modal-title{color:var(--text-primary, #fff)}}.auth-form{display:flex;flex-direction:column;gap:1rem}.auth-field{display:flex;flex-direction:column;gap:.5rem}.auth-field label{font-size:.875rem;font-weight:500;color:var(--text-secondary, #666)}.auth-field input{padding:.75rem 1rem;border:1px solid var(--border-color, #ddd);border-radius:8px;font-size:1rem;background:var(--input-bg, #fff);color:var(--text-primary, #333);transition:border-color .2s}.auth-field input:focus{outline:none;border-color:var(--accent-color, #007aff)}@media(prefers-color-scheme:dark){.auth-field label{color:var(--text-secondary, #aaa)}.auth-field input{background:var(--input-bg, #2a2a2a);border-color:var(--border-color, #444);color:var(--text-primary, #fff)}}.auth-error{padding:.75rem 1rem;background:#fee2e2;color:#dc2626;border-radius:8px;font-size:.875rem}@media(prefers-color-scheme:dark){.auth-error{background:#7f1d1d;color:#fecaca}}.auth-submit{padding:.875rem 1rem;background:var(--accent-color, #007aff);color:#fff;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:background-color .2s;margin-top:.5rem}.auth-submit:hover:not(:disabled){background:var(--accent-color-hover, #0056b3)}.auth-submit:disabled{opacity:.6;cursor:not-allowed}.auth-switch{margin-top:1.5rem;text-align:center;font-size:.875rem;color:var(--text-secondary, #666)}.auth-switch-button{background:none;border:none;color:var(--accent-color, #007aff);cursor:pointer;font-size:.875rem;padding:0;text-decoration:underline}.auth-switch-button:hover{color:var(--accent-color-hover, #0056b3)}.auth-social-buttons{display:flex;flex-direction:column;gap:.75rem}.auth-social-button{padding:.875rem 1rem;border:1px solid var(--border-color, #ddd);border-radius:8px;font-size:1rem;font-weight:500;cursor:pointer;transition:background-color .2s,border-color .2s;background:var(--bg-primary, #fff);color:var(--text-primary, #333)}.auth-social-button:hover:not(:disabled){background:var(--bg-secondary, #f5f5f5);border-color:var(--border-color-hover, #bbb)}.auth-social-button:disabled{opacity:.6;cursor:not-allowed}.auth-passkey-button{background:var(--bg-secondary, #f5f5f5)}.auth-passkey-button:hover:not(:disabled){background:var(--bg-tertiary, #eee)}.auth-apple-button{background:#000;color:#fff;border-color:#000}.auth-apple-button:hover:not(:disabled){background:#333;border-color:#333}@media(prefers-color-scheme:dark){.auth-social-button{background:var(--bg-secondary, #2a2a2a);border-color:var(--border-color, #444);color:var(--text-primary, #fff)}.auth-social-button:hover:not(:disabled){background:var(--bg-tertiary, #333);border-color:var(--border-color-hover, #555)}.auth-passkey-button{background:var(--bg-tertiary, #333)}.auth-passkey-button:hover:not(:disabled){background:var(--bg-quaternary, #3a3a3a)}.auth-apple-button{background:#fff;color:#000;border-color:#fff}.auth-apple-button:hover:not(:disabled){background:#eee;border-color:#eee}}.auth-divider{display:flex;align-items:center;margin:1.25rem 0}.auth-divider:before,.auth-divider:after{content:"";flex:1;height:1px;background:var(--border-color, #ddd)}.auth-divider span{padding:0 1rem;font-size:.875rem;color:var(--text-secondary, #666);text-transform:lowercase}@media(prefers-color-scheme:dark){.auth-divider:before,.auth-divider:after{background:var(--border-color, #444)}.auth-divider span{color:var(--text-secondary, #aaa)}}:root{--background-color: #FDF8F0;--card-background: #FFFFFF;--text-color: #4A4A4A;--subtle-text-color: #8D8D8D;--primary-color: #6D8B74;--primary-hover-color: #556B5B;--light-grey: #EAEAEA;--light-grey-rgb: 234, 234, 234;--border-color: #DCDCDC;--text-display-bg: #F9F9F9;--grade-success-color: #27ae60;--grade-fail-color: #c0392b}@media(prefers-color-scheme:dark){:root{--background-color: #1a1a1a;--card-background: #2a2a2a;--text-color: #E0E0E0;--subtle-text-color: #999999;--primary-color: #7FA886;--primary-hover-color: #6D9474;--light-grey: #3a3a3a;--light-grey-rgb: 58, 58, 58;--border-color: #444444;--text-display-bg: #333333;--grade-success-color: #2ecc71;--grade-fail-color: #e74c3c}}*:focus{outline:none}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:var(--background-color);color:var(--text-color)}.app-container{max-width:700px;margin:1.2rem auto;padding:1rem;box-sizing:border-box;width:100%}.app-header{display:flex;flex-direction:column;gap:1rem;align-items:center;padding-bottom:.6rem;margin-bottom:.5rem}.banner-container{position:relative;width:100%}.banner-image{width:100%;border-radius:10px;display:block}.language-selector-wrapper{position:absolute;bottom:10px;right:10px;display:flex;gap:10px}.faq-button-wrapper{position:absolute;bottom:10px;left:10px;width:32px;height:32px;background-color:#0006;border-radius:50%;display:flex;justify-content:center;align-items:center;font-weight:700;font-size:1.2rem;color:#fff;cursor:pointer;box-shadow:0 2px 4px #0003;-webkit-user-select:none;user-select:none;transition:transform .1s ease,background-color .2s ease;text-decoration:none}.faq-button-wrapper:hover{transform:scale(1.05);background-color:#0009}.faq-button-wrapper:active{transform:scale(.95)}.auth-button-wrapper{position:absolute;top:10px;left:10px}.auth-button{padding:.4rem .8rem;background-color:#0006;border:none;border-radius:16px;color:#fff;font-size:.85rem;font-weight:500;cursor:pointer;transition:background-color .2s ease,transform .1s ease;box-shadow:0 2px 4px #0003}.auth-button:hover{background-color:#0009;transform:scale(1.02)}.auth-button:active{transform:scale(.98)}.auth-loading{padding:.4rem .8rem;color:#ffffffb3;font-size:.85rem}.queue-display{position:absolute;top:-14px;right:-8px;background-color:#e74c3c;color:#fff;border-radius:50%;width:44px;height:44px;display:flex;justify-content:center;align-items:center;font-size:1.6rem;font-weight:700;box-shadow:0 4px 8px #0003;border:4px solid white;transform:rotate(15deg);transition:width .3s ease,height .3s ease,font-size .3s ease,border-width .3s ease,top .3s ease,right .3s ease}.header-controls{min-height:20px}.completion-card{background-color:var(--card-background);border:1px solid var(--border-color);border-radius:12px;padding:3rem 2rem;box-shadow:0 4px 12px #00000014;text-align:center}.completion-icon{width:80px;height:80px;margin:0 auto 1.5rem;background-color:var(--grade-success-color);border-radius:50%;display:flex;justify-content:center;align-items:center;font-size:3rem;color:#fff}.completion-card h2{margin:0 0 .5rem;font-size:1.8rem;color:var(--text-color)}.completion-card p{margin:0;font-size:1.1rem;color:var(--subtle-text-color)}.copyright-footer{text-align:center;margin-top:1.5rem;margin-bottom:1rem;font-size:.8rem;color:var(--subtle-text-color);opacity:.8}@media(max-width:768px){.app-container{margin:.5rem auto;padding:.5rem .75rem}.app-header h1{font-size:1.8rem}.header-controls{flex-direction:column;gap:1rem}}@media(max-width:500px){.queue-display{width:36px;height:36px;font-size:1.3rem;border-width:3px;top:-10px;right:-6px}}@media(prefers-color-scheme:dark){.queue-display{border-color:#fff;background-color:#b84550}}.mobile-controls-bar{display:none;justify-content:flex-start;align-items:center;gap:12px;padding:12px 16px;margin-top:16px;background-color:var(--card-background);border-radius:12px;box-shadow:0 2px 8px #0000001a;opacity:0;transition:opacity .3s ease}.header-control-mobile-hide{opacity:1;transition:opacity .3s ease}@media(max-width:480px){.header-control-mobile-hide{opacity:0;pointer-events:none}.mobile-controls-bar{display:flex;opacity:1}}.mobile-controls-bar .language-selector-container,.mobile-controls-bar .difficulty-selector-container{background-color:var(--light-grey);color:var(--text-color)}.mobile-controls-bar .language-select,.mobile-controls-bar .difficulty-select{color:var(--text-color)}