.btn{padding:.75rem 1.5rem;border:1px solid transparent;border-radius:18px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease;font-family:inherit;display:inline-flex;align-items:center;justify-content:center;gap:.5rem}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;box-shadow:0 8px 25px #667eea4d;border:1px solid rgba(102,126,234,.3)}.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 12px 35px #667eea66;background:linear-gradient(135deg,#7a8fee,#8b5cb8)}.btn-primary:active:not(:disabled){transform:translateY(0);box-shadow:0 6px 15px #8888884d}.btn-secondary{background:#ffffff1a;color:#ffffffe6;border:1px solid rgba(255,255,255,.2);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.btn-secondary:hover:not(:disabled){background:#ffffff26;border-color:#ffffff4d;transform:translateY(-2px);box-shadow:0 8px 20px #0003}.btn-secondary:active:not(:disabled){transform:translateY(0)}.btn-ghost{background:transparent;color:#333;border:1.5px solid #ddd;font-weight:600}.btn-ghost:hover:not(:disabled){background:#f5f5f5;border-color:#999;color:#000}.btn-sm{padding:.5rem 1rem;font-size:.875rem}.btn-md{padding:.75rem 1.5rem;font-size:1rem}.btn-lg{padding:1rem 2rem;font-size:1.125rem}@media (prefers-color-scheme: dark){.btn-ghost{color:#e0e0e0;border-color:#555}.btn-ghost:hover:not(:disabled){background:#ffffff1a;border-color:#777;color:#fff}}.error-message{animation:slideIn .3s ease;margin-bottom:1.5rem;position:relative;z-index:100}.error-content{display:flex;align-items:center;gap:1rem;padding:1rem;background:#f4433626;border:1px solid #f44336;border-left:4px solid #f44336;border-radius:8px;color:#ff6b6b;position:relative;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.error-icon{font-size:1.5rem;flex-shrink:0}.error-content p{margin:0;flex:1;font-size:.95rem}.error-close{background:none;border:none;color:#c62828;cursor:pointer;font-size:1.25rem;padding:0;flex-shrink:0;transition:opacity .2s ease}.error-close:hover{opacity:.7}@keyframes slideIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}@media (prefers-color-scheme: dark){.error-content{background:#f443361a;border-left-color:#f44336;color:#ff6b6b}.error-close{color:#ff6b6b}}.loading{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1.5rem;min-height:300px}.loading-fullscreen{position:fixed;top:0;left:0;width:100%;height:100vh;background:#fffffff2;z-index:9999;min-height:100vh}.loading-spinner{width:50px;height:50px;border:4px solid rgba(102,126,234,.2);border-top-color:#667eea;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading p{color:#667eea;font-size:1rem;font-weight:500}@media (prefers-color-scheme: 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480px){.forgot-password-modal{border-radius:12px}.forgot-password-form{padding:1.5rem 1rem}.form-group input{font-size:16px}.forgot-password-header{padding:1.2rem}.forgot-password-header h3{font-size:1.1rem}}.login-container{position:fixed;top:0;left:0;right:0;bottom:0;width:100%;height:100%;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:1rem;background-image:url(/assets/bg-login-DX6TIJJ9.jpg);background-size:cover;background-position:center;background-attachment:fixed;position:relative;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.login-container:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(to bottom,#000c,#000000b3);z-index:1}.login-content{position:relative;z-index:2;display:flex;align-items:center;justify-content:center;width:100%}.login-card{background:#0009;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid 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ease}.header__nav-item:hover{color:#fffffff2}.header__nav-item:hover:after{width:100%}.header__nav-item--logout{color:#ff6464cc}.header__nav-item--logout:hover{color:#ff6464}.header__menu-mobile{display:none}.header__menu-trigger{position:relative}.header__menu-button{background:#ffffff1a;border:1px solid rgba(255,255,255,.2);color:#ffffffe6;padding:.6rem .8rem;border-radius:8px;cursor:pointer;font-size:1.2rem;transition:all .3s ease;display:flex;align-items:center;justify-content:center;width:40px;height:40px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.header__menu-button:hover{background:#ffffff26;border-color:#ffffff4d}.header__menu{position:fixed;top:70px;left:1rem;background:#141419f2;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,.1);border-radius:12px;box-shadow:0 10px 40px #0000004d;overflow:hidden;animation:slideDown .2s ease;min-width:200px;z-index:101}.header__menu-item{display:block;width:100%;padding:.85rem 1.5rem;border:none;background:none;text-align:left;color:#ffffffd9;cursor:pointer;font-size:.95rem;transition:all .2s ease;font-family:inherit}.header__menu-item:hover{background:#ffffff14;color:#fffffff2}.header__menu-item:first-child{border-bottom:1px solid rgba(255,255,255,.05)}.header__menu-item--logout{color:#ff6464cc}.header__menu-item--logout:hover{background:#ff64641a;color:#ff6464}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 768px){.header__container{padding:0 1.5rem;gap:1rem;justify-content:space-between}.header__nav{display:none}.header__menu-mobile{display:block}}@media (max-width: 480px){.header__container{padding:0 1rem}.header__menu-button{width:36px;height:36px}.header__menu{min-width:150px}.header__menu-item{padding:.7rem 1rem;font-size:.85rem}}.book-home{animation:fadeInUp .6s ease;width:100%;max-width:900px;margin:0 auto}.book-home__header{text-align:center;margin-bottom:3rem}.book-home__app{margin-bottom:20px}.book-home__app_box{font-size:1.8rem;color:#fff;font-weight:700;letter-spacing:-.5px;font-family:Courier New,monospace;background-color:#35354b;padding:10px 20px;border-radius:25px;margin-bottom:20px}.book-home__title{font-size:2.1rem;margin:0 0 .75rem;color:#fffffff2;font-weight:700;letter-spacing:-.5px;font-family:Courier New,monospace}.book-home__subtitle{font-size:1rem;color:#ffffffa6;margin:0;font-weight:400;line-height:1.5}.book-home__cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:2rem}.book-home__card{background:#28283780;backdrop-filter:blur(15px);-webkit-backdrop-filter:blur(15px);border:1px solid rgba(255,255,255,.1);border-radius:16px;padding:2.5rem;cursor:pointer;transition:all .3s cubic-bezier(.34,1.56,.64,1);position:relative;overflow:hidden;box-shadow:0 8px 32px #0003;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:280px;text-align:center}.book-home__card:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.1),transparent);transition:left .5s ease;pointer-events:none}.book-home__card:hover:before{left:100%}.book-home__card:hover{border-color:#fff3;box-shadow:0 12px 40px #0000004d;transform:translateY(-6px);background:#32324699}.book-home__card:active{transform:translateY(-2px)}.book-home__card-content{position:relative;z-index:1}.book-home__card h2{font-size:1.8rem;margin:0 0 1rem;color:#fffffff2;font-weight:700;font-family:Courier New,monospace;letter-spacing:-.5px}.book-home__card p{font-size:1rem;margin:0;color:#ffffffa6;line-height:1.6}@keyframes fadeInUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 768px){.book-home__title{font-size:2rem;margin-bottom:.5rem}.book-home__subtitle{font-size:.9rem}.book-home__cards{gap:1.5rem}.book-home__card{padding:2rem;min-height:240px}.book-home__card h2{font-size:1.5rem}.book-home__card p{font-size:1rem}}@media (max-width: 480px){.book-home__title{font-size:1.5rem}.book-home__cards{grid-template-columns:1fr;gap:1rem}.book-home__card{padding:1.5rem;min-height:220px}.book-home__card h2{font-size:1.3rem}.book-home__card p{font-size:1rem}}.book-explanation{padding:0;margin-bottom:2rem;animation:fadeInUp .6s ease}.explanation-card{background:#1e1e2899;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,.1);border-radius:20px;padding:2.5rem;box-shadow:0 8px 32px #0003}.explanation-header{text-align:center;margin-bottom:2.5rem}.explanation-header h2{font-size:2rem;margin:0 0 .5rem;color:#fffffff2;font-weight:700;letter-spacing:-.5px}.explanation-header .subtitle{color:#fff9;font-size:1rem;margin:0;font-weight:400}.explanation-content{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem;margin-bottom:2rem}.explanation-block{display:flex;gap:1.5rem;padding:1.5rem;background:#ffffff0d;border:1px solid rgba(255,255,255,.08);border-radius:12px;transition:all .3s ease;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.explanation-block:hover{background:#ffffff14;border-color:#ffffff26;transform:translateY(-2px);box-shadow:0 8px 20px #0003}.block-text h3{margin:0 0 .5rem;color:#fffffff2;font-size:1.2rem;font-weight:600}.block-text p{margin:0;color:#ffffffa6;font-size:1rem;line-height:1.6}.progress-section{margin-top:2rem;padding-top:2rem;border-top:1px solid rgba(255,255,255,.08)}.progress-info{margin-bottom:1.5rem}.progress-info h4{margin:0 0 .5rem;color:#fffffff2;font-size:1.1rem;font-weight:600}.progress-stats{margin:0 0 .3rem;color:#fffc;font-weight:500}.progress-remaining{margin:0;color:#ffffff80;font-size:.9rem}.progress-bar{width:100%;height:12px;background:#ffffff1a;border-radius:10px;overflow:hidden;border:1px solid rgba(255,255,255,.08)}.progress-fill{height:100%;background:linear-gradient(90deg,#888,#aaa);transition:width .5s ease;border-radius:10px}@media (max-width: 768px){.explanation-card{padding:1.5rem;border-radius:16px}.explanation-header h2{font-size:1.5rem}.explanation-content{grid-template-columns:1fr;gap:1rem}.explanation-block{padding:1.2rem;gap:1rem}.block-icon{font-size:2rem}}@media (max-width: 480px){.explanation-card{padding:1.2rem;border-radius:12px}.explanation-header h2{font-size:1.3rem}.explanation-content{gap:.75rem}.explanation-block{padding:1rem}}.chapter-card{background:#1e1e2880;backdrop-filter:blur(15px);-webkit-backdrop-filter:blur(15px);border:1px solid rgba(255,255,255,.1);border-radius:16px;padding:1.5rem;cursor:pointer;transition:all .3s ease;position:relative;overflow:hidden;box-shadow:0 8px 32px #00000026;display:flex;flex-direction:column;justify-content:space-between;min-height:200px}.chapter-card:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.1),transparent);transition:left .5s ease;pointer-events:none}.chapter-card:hover:before{left:100%}.chapter-card:not(.chapter-card--locked):hover{border-color:#fff3;box-shadow:0 12px 40px #00000040;transform:translateY(-4px);background:#28283799}.chapter-card--locked{opacity:.5;cursor:not-allowed}.chapter-card--has-comment{border-color:#ffffff26;background:#23233299}.chapter-card__number{font-size:.8rem;color:#ffffff80;font-weight:600;text-transform:uppercase;letter-spacing:1px;margin-bottom:.8rem}.chapter-pill{background:#ffffff1a;border:1px solid rgba(255,255,255,.2);padding:5px 10px;border-radius:20px}.chapter-card__content{position:relative;z-index:1;flex:1}.chapter-card__title{margin:0 0 .75rem;font-size:1.15rem;color:#fffffff2;font-weight:600;transition:color .3s ease}.chapter-card:not(.chapter-card--locked):hover .chapter-card__title{color:#fffffffc}.chapter-card__preview{margin:0;color:#fff;font-size:1rem;line-height:1.5}.chapter-card__overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:#0a0a0fcc;display:flex;align-items:center;justify-content:center;font-weight:600;color:#fff9;font-size:.95rem;z-index:10;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}@media (max-width: 768px){.chapter-card{padding:1.2rem;min-height:180px}.chapter-card__title{font-size:1.1rem}.chapter-card__preview{font-size:1rem}}@media (max-width: 480px){.chapter-card{padding:1rem;min-height:160px}.chapter-card__title{font-size:1.1rem}.chapter-card__preview{font-size:1rem}}.comment-modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:1rem;animation:fadeIn .2s ease}.comment-modal{background:#fff;border-radius:16px;width:100%;max-width:500px;box-shadow:0 25px 50px #00000040;animation:slideUp .3s ease;display:flex;flex-direction:column}.comment-modal__header{display:flex;justify-content:space-between;align-items:center;padding:1.5rem;border-bottom:1px solid #e0e0e0}.comment-modal__header h3{margin:0;font-size:1.3rem;color:#333}.comment-modal__close{background:none;border:none;font-size:1.5rem;cursor:pointer;color:#999;padding:0;width:32px;height:32px;display:flex;align-items:center;justify-content:center;transition:color .2s ease}.comment-modal__close:hover:not(:disabled){color:#333}.comment-modal__close:disabled{cursor:not-allowed;opacity:.6}.comment-modal__content{padding:1.5rem;flex:1}.comment-modal__textarea{width:100%;min-height:180px;padding:1rem;border:2px solid #e0e0e0;border-radius:8px;font-size:1rem;font-family:inherit;line-height:1.6;resize:vertical;transition:border-color .3s ease;background:#fff;color:#333}.comment-modal__textarea:focus{outline:none;border-color:#888;box-shadow:0 0 0 3px #8888881a}.comment-modal__textarea:disabled{background:#f5f5f5;cursor:not-allowed;opacity:.7}.comment-modal__counter{text-align:right;font-size:.85rem;color:#999;margin-top:.5rem}.comment-modal__footer{display:flex;gap:1rem;padding:1.5rem;border-top:1px solid #e0e0e0;justify-content:flex-end}@media (prefers-color-scheme: dark){.comment-modal-overlay{background:#000000b3}.comment-modal{background:#242424;box-shadow:0 25px 50px #00000080}.comment-modal__header{border-bottom-color:#404040}.comment-modal__header 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