*{box-sizing:border-box;margin:0;padding:0}:root{--primary-dark: #1a237e;--primary: #3949ab;--primary-light: #5c6bc0;--accent: #1a237e;--accent-hover: #283593;--accent-dark: #0d1452;--bg-dark: #f5f7fa;--bg-card: #ffffff;--bg-card-hover: #f8f9fc;--bg-hover: #f0f2f5;--text-primary: #1a1a2e;--text-secondary: #4a5568;--text-muted: #718096;--border: #e2e8f0;--success: #48bb78;--warning: #ed8936;--error: #f56565;--font-display: "Space Grotesk", system-ui, sans-serif;--font-body: "DM Sans", system-ui, sans-serif;--font-mono: "JetBrains Mono", ui-monospace, monospace}body{font-family:var(--font-body);background:var(--bg-dark);color:var(--text-primary);line-height:1.6;min-height:100vh;font-size:15px;-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration:none;transition:color .2s}a:hover{color:var(--accent-hover)}.container{max-width:1200px;margin:0 auto;padding:0 24px}.card{background:var(--bg-card);border-radius:16px;border:1px solid var(--border);padding:24px;transition:all .2s}.card:hover{background:var(--bg-card-hover);border-color:var(--primary-light)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 24px;border:none;border-radius:10px;font-size:14px;font-family:var(--font-body);font-weight:600;cursor:pointer;transition:all .2s;text-decoration:none;letter-spacing:-.01em}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover);transform:translateY(-1px);box-shadow:0 4px 12px #1a237e4d}.btn-secondary{background:var(--primary);color:#fff}.btn-secondary:hover{background:var(--primary-light)}input[type=text],input[type=email],input[type=password]{width:100%;padding:14px 18px;border:2px solid var(--border);border-radius:10px;font-size:14px;font-family:var(--font-body);background:var(--bg-dark);color:var(--text-primary);transition:all .2s}input::placeholder{color:var(--text-muted)}input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #1a237e1a}.header{background:var(--bg-card);border-bottom:1px solid var(--border);padding:16px 0;position:sticky;top:0;z-index:100;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.header-content{display:flex;justify-content:space-between;align-items:center}.logo{font-family:var(--font-display);font-size:22px;font-weight:700;letter-spacing:-.02em;color:var(--accent)}.nav{display:flex;gap:8px;align-items:center}.nav a{color:var(--text-secondary);font-weight:500;padding:8px 16px;border-radius:8px;transition:all .2s;font-size:14px}.nav a:hover{color:var(--text-primary);background:var(--bg-card-hover)}.nav a.active{color:var(--accent);background:#ffd7401a}.language-selector{padding:8px 14px;border:2px solid var(--border);border-radius:8px;font-size:14px;font-family:var(--font-body);background:var(--bg-dark);color:var(--text-primary);cursor:pointer;font-weight:500;transition:all .2s}.language-selector:focus{outline:none;border-color:var(--accent)}.language-selector:hover{border-color:var(--primary-light)}.page{padding:48px 0}.page-header{margin-bottom:40px}.page-title{font-family:var(--font-display);font-size:32px;font-weight:700;margin-bottom:8px;letter-spacing:-.03em;color:var(--text-primary)}.page-subtitle{color:var(--text-secondary);font-size:16px}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px;margin-bottom:32px}.stat-card{text-align:center;padding:28px}.stat-value{font-family:var(--font-mono);font-size:40px;font-weight:600;letter-spacing:-.02em;background:linear-gradient(135deg,var(--accent),var(--accent-dark));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.stat-label{font-size:13px;color:var(--text-secondary);margin-top:8px;font-weight:500;text-transform:uppercase;letter-spacing:.05em}.stat-sublabel{font-size:12px;color:var(--text-muted);margin-top:4px}.section{margin-bottom:32px}.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.section-title{font-family:var(--font-display);font-size:18px;font-weight:600;color:var(--text-primary);letter-spacing:-.01em}.words-list{display:grid;gap:12px}.word-item{display:flex;justify-content:space-between;align-items:center;padding:18px 20px;background:var(--bg-card-hover);border-radius:12px;border:1px solid var(--border);transition:all .2s}.word-item:hover{border-color:var(--primary-light);transform:translate(4px)}.word-text{font-family:var(--font-display);font-weight:600;font-size:17px;color:var(--accent);letter-spacing:-.01em}.word-definition{color:var(--text-secondary);font-size:14px;margin-top:4px}.word-meta{text-align:right;font-size:12px;color:var(--text-muted)}.flashcard-container{max-width:600px;margin:0 auto}.flashcard{background:linear-gradient(145deg,var(--bg-card),var(--bg-card-hover));border-radius:20px;border:2px solid var(--border);padding:56px 48px;text-align:center;min-height:320px;display:flex;flex-direction:column;justify-content:center;cursor:pointer;transition:all .3s}.flashcard:hover{border-color:var(--accent);box-shadow:0 8px 32px #ffd74026;transform:translateY(-4px)}.flashcard-word{font-family:var(--font-display);font-size:36px;font-weight:700;margin-bottom:24px;color:var(--accent);letter-spacing:-.02em}.flashcard-definition{font-size:20px;color:var(--text-secondary);margin-bottom:16px;line-height:1.5}.flashcard-context{font-style:italic;color:var(--text-muted);font-size:14px;margin-top:20px;padding:18px;background:var(--bg-dark);border-radius:12px;border:1px solid var(--border)}.flashcard-hint{color:var(--text-muted);font-size:14px}.rating-buttons{display:flex;justify-content:center;gap:10px;margin-top:28px;flex-wrap:wrap}.rating-btn{padding:14px 20px;border:2px solid transparent;border-radius:10px;font-size:14px;font-family:var(--font-body);font-weight:600;cursor:pointer;transition:all .2s}.rating-btn.hard{background:#ef535026;color:var(--error);border-color:var(--error)}.rating-btn.hard:hover{background:#ef535040}.rating-btn.medium{background:#ffa72626;color:var(--warning);border-color:var(--warning)}.rating-btn.medium:hover{background:#ffa72640}.rating-btn.easy{background:#66bb6a26;color:var(--success);border-color:var(--success)}.rating-btn.easy:hover{background:#66bb6a40}.rating-btn:hover{transform:scale(1.05)}.recommendations-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:20px}.recommendation-card{padding:20px}.recommendation-title{font-family:var(--font-display);font-size:18px;font-weight:600;margin-bottom:6px;color:var(--text-primary);letter-spacing:-.01em}.recommendation-author{color:var(--text-muted);font-size:14px;margin-bottom:12px}.recommendation-description{font-size:14px;color:var(--text-secondary);margin-bottom:16px;line-height:1.5}.recommendation-meta{display:flex;gap:10px;flex-wrap:wrap}.recommendation-badge{font-family:var(--font-mono);font-size:11px;font-weight:500;padding:6px 12px;border-radius:20px;background:#ffd74026;color:var(--accent);letter-spacing:.02em}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;background:linear-gradient(145deg,var(--bg-dark),#0a0f18)}.auth-card{width:100%;max-width:420px;padding:40px}.auth-header{text-align:center;margin-bottom:36px}.auth-title{font-family:var(--font-display);font-size:28px;font-weight:700;margin-bottom:8px;color:var(--text-primary);letter-spacing:-.02em}.auth-subtitle{color:var(--text-secondary)}.form-group{margin-bottom:20px}.form-label{display:block;font-size:13px;font-weight:600;margin-bottom:8px;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em}.form-error{color:var(--error);font-size:14px;margin-top:16px;text-align:center;padding:12px;background:#ef53501a;border-radius:8px}.auth-footer{text-align:center;margin-top:28px;color:var(--text-muted);font-size:14px}.empty-state{text-align:center;padding:56px;color:var(--text-secondary)}.empty-state-icon{font-size:56px;margin-bottom:20px}.empty-state-title{font-family:var(--font-display);font-size:20px;font-weight:600;margin-bottom:8px;color:var(--text-primary)}.empty-state-text{font-size:14px;color:var(--text-muted)}.loading{text-align:center;padding:56px;color:var(--text-secondary)}.spinner{width:44px;height:44px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite;margin:0 auto 20px}@keyframes spin{to{transform:rotate(360deg)}}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-dark)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--primary-light)}.reader-upload{min-height:calc(100vh - 80px);display:flex;align-items:center;justify-content:center;padding:40px}.reader-upload-content{text-align:center;max-width:400px}.reader-upload-content h1{font-family:var(--font-display);font-size:32px;font-weight:700;margin-bottom:16px;color:var(--text-primary);letter-spacing:-.02em}.reader-upload-content p{color:var(--text-secondary);margin-bottom:32px;line-height:1.6}.reader-upload-btn{cursor:pointer}.reader-container{display:flex;flex-direction:column;height:calc(100vh - 73px);background:var(--bg-dark)}.reader-toolbar{display:flex;justify-content:space-between;align-items:center;padding:12px 24px;background:var(--bg-card);border-bottom:1px solid var(--border)}.reader-toolbar-left,.reader-toolbar-right{display:flex;align-items:center;gap:12px}.reader-toolbar-center{position:absolute;left:50%;transform:translate(-50%)}.reader-book-name{font-family:var(--font-display);font-weight:600;color:var(--text-secondary);font-size:14px;max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.reader-progress{font-family:var(--font-mono);font-size:14px;color:var(--accent);font-weight:500}.reader-close-btn,.reader-font-btn{padding:8px 14px;font-size:13px}.reader-font-size{font-family:var(--font-mono);font-size:13px;color:var(--text-secondary);min-width:44px;text-align:center}.epub-viewer{flex:1;display:flex;justify-content:center;position:relative;overflow:hidden;padding:0 70px}.epub-content{width:100%;max-width:650px;height:100%;background:#fff}.epub-content iframe{border:none}.epub-nav{position:absolute;top:50%;transform:translateY(-50%);width:60px;height:120px;background:#1a2332e6;border:1px solid var(--border);color:var(--text-secondary);font-size:32px;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center;z-index:10}.epub-nav:hover:not(:disabled){background:var(--bg-card-hover);color:var(--accent);border-color:var(--accent)}.epub-nav:disabled{opacity:.3;cursor:not-allowed}.epub-nav-prev{left:0;border-radius:0 12px 12px 0;border-left:none}.epub-nav-next{right:0;border-radius:12px 0 0 12px;border-right:none}.word-popup-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:999}.word-popup{position:fixed;z-index:1000;width:300px;background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:16px;box-shadow:0 8px 32px #00000026;animation:popupFadeIn .15s ease-out}@keyframes popupFadeIn{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.word-popup-word{font-family:var(--font-display);font-size:20px;font-weight:700;color:var(--accent);margin-bottom:8px;letter-spacing:-.01em}.word-popup-definition{color:var(--text-secondary);font-size:14px;line-height:1.5;margin-bottom:12px}.word-popup-definition.loading{color:var(--text-muted);font-style:italic}.word-popup-meta{font-size:12px;padding:8px 12px;border-radius:6px;font-weight:500}.word-popup-meta.new{background:#66bb6a26;color:var(--success)}.word-popup-meta.repeat{background:#ffa72626;color:var(--warning)}.reader-library{padding:48px 0}.reader-library-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:32px}.reader-library-header h1{font-family:var(--font-display);font-size:32px;font-weight:700;letter-spacing:-.02em}.reader-empty{text-align:center;padding:64px;color:var(--text-secondary)}.reader-book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}.reader-book-card{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:20px;cursor:pointer;transition:all .2s;display:flex;gap:16px;position:relative}.reader-book-card:hover{background:var(--bg-card-hover);border-color:var(--primary-light);transform:translateY(-2px)}.reader-book-cover{width:60px;height:80px;background:var(--bg-dark);border-radius:6px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.reader-book-icon{font-size:28px}.reader-book-info{flex:1;min-width:0}.reader-book-title{font-family:var(--font-display);font-size:16px;font-weight:600;color:var(--text-primary);margin-bottom:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.reader-book-progress-bar{height:6px;background:var(--bg-dark);border-radius:3px;overflow:hidden;margin-bottom:6px}.reader-book-progress-fill{height:100%;background:var(--accent);border-radius:3px;transition:width .3s}.reader-book-progress-text{font-size:12px;color:var(--text-muted)}.reader-book-delete{position:absolute;top:8px;right:8px;width:24px;height:24px;border:none;background:transparent;color:var(--text-muted);font-size:18px;cursor:pointer;border-radius:4px;opacity:0;transition:all .2s}.reader-book-card:hover .reader-book-delete{opacity:1}.reader-book-delete:hover{background:#ef535026;color:var(--error)}.pdf-viewer{flex:1;display:flex;justify-content:center;position:relative;overflow:hidden;padding:0 70px;background:var(--bg-dark)}.pdf-content{display:flex;flex-direction:column;align-items:center;overflow-y:auto;padding:20px 0;max-height:100%}.pdf-page-container{position:relative;box-shadow:0 4px 20px #0000001a;background:#fff}.pdf-canvas{display:block}.pdf-text-layer{position:absolute;top:0;left:0;overflow:hidden;-webkit-user-select:text;user-select:text}.pdf-text-layer span{position:absolute;white-space:pre;transform-origin:0 0}.pdf-text-layer span::selection{background:#1a237e33}.pdf-page-indicator{margin-top:16px;font-family:var(--font-mono);font-size:13px;color:var(--text-secondary)}.landing{min-height:100vh}.landing-header{padding:20px 0;position:fixed;top:0;left:0;right:0;z-index:100;background:#fffffff2;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}.landing-header-content{display:flex;justify-content:space-between;align-items:center}.landing-nav{display:flex;gap:12px}.landing-hero{padding:180px 0 100px;text-align:center;background:linear-gradient(180deg,var(--bg-dark) 0%,var(--bg-card) 100%)}.landing-hero-title{font-family:var(--font-display);font-size:56px;font-weight:700;line-height:1.1;margin-bottom:24px;letter-spacing:-.03em}.landing-hero-title .highlight{background:linear-gradient(135deg,var(--accent),var(--accent-dark));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.landing-hero-subtitle{font-size:20px;color:var(--text-secondary);max-width:600px;margin:0 auto 40px;line-height:1.6}.landing-hero-cta{display:flex;flex-direction:column;align-items:center;gap:12px}.landing-hero-note{font-size:14px;color:var(--text-muted)}.btn-large{padding:16px 32px;font-size:16px}.landing-section{padding:80px 0}.landing-section-title{font-family:var(--font-display);font-size:36px;font-weight:700;text-align:center;margin-bottom:48px;letter-spacing:-.02em}.landing-problem{background:var(--bg-dark)}.landing-problems-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px;margin-bottom:48px}.landing-problem-card{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:32px;text-align:center}.landing-problem-icon{font-size:40px;margin-bottom:16px}.landing-problem-card h3{font-family:var(--font-display);font-size:18px;font-weight:600;margin-bottom:8px;color:var(--text-primary)}.landing-problem-card p{color:var(--text-secondary);font-size:15px}.landing-solution{text-align:center;max-width:700px;margin:0 auto;padding:32px;background:#ffd7400d;border:1px solid rgba(255,215,64,.2);border-radius:16px}.landing-solution-text{font-size:18px;color:var(--text-primary);line-height:1.6}.landing-features{background:var(--bg-card)}.landing-features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px}.landing-feature-card{background:var(--bg-dark);border:1px solid var(--border);border-radius:16px;padding:32px;transition:all .2s}.landing-feature-card:hover{border-color:var(--primary-light);transform:translateY(-4px)}.landing-feature-icon{font-size:36px;margin-bottom:16px}.landing-feature-card h3{font-family:var(--font-display);font-size:18px;font-weight:600;margin-bottom:8px;color:var(--text-primary)}.landing-feature-card p{color:var(--text-secondary);font-size:15px;line-height:1.5}.landing-how{background:var(--bg-dark)}.landing-steps{display:flex;justify-content:center;align-items:center;gap:24px;flex-wrap:wrap}.landing-step{text-align:center;max-width:220px}.landing-step-number{width:56px;height:56px;background:var(--accent);color:var(--bg-dark);font-family:var(--font-display);font-size:24px;font-weight:700;border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 16px}.landing-step h3{font-family:var(--font-display);font-size:18px;font-weight:600;margin-bottom:8px}.landing-step p{color:var(--text-secondary);font-size:14px}.landing-step-arrow{font-size:32px;color:var(--text-muted)}.landing-languages{background:var(--bg-card)}.landing-language-cards{display:flex;justify-content:center;gap:24px;margin-bottom:24px}.landing-language-card{background:var(--bg-dark);border:1px solid var(--border);border-radius:12px;padding:24px 48px;display:flex;align-items:center;gap:12px}.landing-language-flag{font-size:32px}.landing-language-name{font-family:var(--font-display);font-size:20px;font-weight:600}.landing-coming-soon{text-align:center;color:var(--text-muted);font-size:14px}.landing-cta{background:linear-gradient(180deg,var(--bg-dark) 0%,var(--primary-dark) 100%);text-align:center;padding:100px 0}.landing-cta h2{font-family:var(--font-display);font-size:40px;font-weight:700;margin-bottom:16px;letter-spacing:-.02em}.landing-cta p{color:var(--text-secondary);font-size:18px;margin-bottom:32px}.landing-footer{background:var(--bg-card);border-top:1px solid var(--border);padding:48px 0;text-align:center}.landing-footer .logo{display:block;margin-bottom:8px}.landing-footer p{color:var(--text-muted);font-size:14px}@media (max-width: 768px){.landing-hero-title{font-size:36px}.landing-hero-subtitle{font-size:16px}.landing-section-title{font-size:28px}.landing-step-arrow{display:none}.landing-steps{flex-direction:column}}.google-signin-container{margin-top:24px}.auth-divider{display:flex;align-items:center;margin-bottom:20px}.auth-divider:before,.auth-divider:after{content:"";flex:1;height:1px;background:var(--border)}.auth-divider span{padding:0 16px;color:var(--text-muted);font-size:13px;text-transform:uppercase;letter-spacing:.05em}.google-signin-button{display:flex;justify-content:center}.google-signin-button>div{width:100%!important}