:root{--primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--primary-500: #667eea;--primary-600: #5a6fd6;--primary-700: #4e60c2;--secondary-500: #14b8a6;--secondary-600: #0d9488;--gray-50: #f8fafc;--gray-100: #f1f5f9;--gray-200: #e2e8f0;--gray-300: #cbd5e1;--gray-400: #94a3b8;--gray-500: #64748b;--gray-600: #475569;--gray-700: #334155;--gray-800: #1e293b;--gray-900: #0f172a;--success: #22c55e;--warning: #f59e0b;--error: #ef4444;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1), 0 8px 10px -6px rgb(0 0 0 / 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var(--gray-200);transition:all var(--transition-fast)}.show-known-toggle:hover{background:var(--gray-50)}.show-known-toggle input{width:18px;height:18px;cursor:pointer;accent-color:var(--primary-500)}.loading,.error{text-align:center;padding:var(--space-12);font-size:1.2rem}.error{color:var(--error)}.word-table-container{overflow-x:auto;background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);margin-bottom:var(--space-8)}.word-table{width:100%;border-collapse:collapse}.word-table thead{background:var(--primary-gradient);color:#fff}.word-table th{padding:var(--space-4);text-align:left;font-weight:600;text-transform:uppercase;font-size:.75rem;letter-spacing:.5px;color:#fff}.word-table tbody tr{border-bottom:1px solid var(--gray-100);transition:background-color var(--transition-fast)}.word-table tbody tr:hover{background-color:var(--gray-50)}.word-table tbody tr.learned{background-color:#dcfce7}.word-table tbody tr.learned:hover{background-color:#bbf7d0}.word-table tbody 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svg{display:inline-block}.modal-content h2{font-size:1.5rem;font-weight:700;color:#1f2937;margin:0 0 .75rem}.modal-content p{font-size:1rem;color:#6b7280;margin:0 0 1.5rem;line-height:1.6}.modal-content p strong{color:#374151}.form-group{margin-bottom:1rem;text-align:left}.form-group label{display:block;font-size:.875rem;font-weight:500;color:#374151;margin-bottom:.5rem}.form-input,.form-select{width:100%;padding:.75rem 1rem;font-size:1rem;border:1px solid #d1d5db;border-radius:8px;background-color:#fff;color:#1f2937;transition:all .2s;box-sizing:border-box}.form-input:focus,.form-select:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea26}.form-input:disabled{background-color:#f9fafb;cursor:not-allowed}.form-select{cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 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h1{font-size:3rem;line-height:1.1;font-weight:800;letter-spacing:-1px;margin-bottom:24px;color:#111827;overflow-wrap:break-word;word-wrap:break-word}.gradient-text{background:linear-gradient(135deg,var(--primary-start),var(--primary-end));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;display:inline}.hero-subtext{font-size:1.25rem;color:var(--text-muted);margin-bottom:32px;max-width:500px}.lang-pills{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:40px}.lang-pills span{background:#fff;border:1px solid var(--border-light);padding:6px 12px;border-radius:6px;font-size:.9rem;font-weight:500;color:var(--text-main);box-shadow:var(--shadow-sm)}.cta-group{max-width:480px}.email-signup{display:flex;gap:12px;margin-bottom:12px}.email-signup input{flex:1;padding:12px 16px;border:1px solid var(--border-light);border-radius:var(--radius-sm);font-size:1rem;outline:none}.email-signup .btn{font-size:.9rem;padding:12px 20px;white-space:nowrap}.email-signup input:focus{border-color:var(--primary-start);box-shadow:0 0 0 3px #667eea33}.micro-copy{font-size:.85rem;color:var(--text-muted)}.demo-grid-wrapper{position:relative;perspective:1000px}.visual-bg-glow{position:absolute;width:120%;height:120%;background:radial-gradient(circle,#667eea26,#fff0 70%);top:-10%;left:-10%;z-index:-1}.demo-cards-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;transform:rotateY(-5deg) rotateX(5deg);transform-style:preserve-3d}.landing-page .flashcard{background-color:transparent;width:100%;aspect-ratio:4/3;perspective:1000px;cursor:pointer}.flashcard-inner{position:relative;width:100%;height:100%;text-align:center;transition:transform .6s cubic-bezier(.4,0,.2,1);transform-style:preserve-3d;box-shadow:var(--shadow-md);border-radius:var(--radius-md)}.landing-page .flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{position:absolute;width:100%;height:100%;-webkit-backface-visibility:hidden;backface-visibility:hidden;border-radius:var(--radius-md);background:#fff;display:flex;flex-direction:column;justify-content:space-between;padding:20px;border:1px solid var(--border-light)}.flashcard-back{transform:rotateY(180deg);background-color:#f8fafc}.card-top{display:flex;justify-content:space-between;align-items:center;font-size:.8rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px}.landing-page .card-content h3{font-size:1.5rem;color:var(--text-main);margin-bottom:4px}.pronunciation{font-family:monospace;color:var(--accent);font-size:.9rem}.card-actions{display:flex;justify-content:space-between;align-items:center}.icon-btn{background:#f3f4f6;border:none;width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text-main);transition:background .2s}.icon-btn:hover{background:#e5e7eb;color:var(--primary-start)}.hint-text{font-size:.75rem;color:var(--text-muted)}.landing-page .features-section{background:#fff;padding:100px 0}.landing-page .section-header{text-align:center;max-width:700px;margin:0 auto 60px}.landing-page .section-header h2{font-size:2.5rem;margin-bottom:16px;color:#111827}.landing-page .section-header p{font-size:1.2rem;color:var(--text-muted)}.landing-page .features-grid{display:grid;grid-template-columns:1fr;gap:40px}.landing-page .feature-card{padding:32px;background:var(--bg-page);border-radius:var(--radius-lg);border:1px solid var(--border-light);transition:transform .2s}.landing-page .feature-card:hover{transform:translateY(-5px)}.icon-box{width:64px;height:64px;background:#fff;border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:24px;color:var(--accent);box-shadow:var(--shadow-sm)}.landing-page .feature-card h3{font-size:1.5rem;margin-bottom:12px;color:var(--text-main)}.landing-page .feature-card p{color:var(--text-muted);line-height:1.6}.social-proof-section{padding:80px 0;border-top:1px solid var(--border-light)}.proof-header{text-align:center;margin-bottom:48px}.proof-header h2{font-size:2.5rem;color:#111827}.landing-page .testimonials-grid{display:grid;grid-template-columns:1fr;gap:32px}.landing-page .testimonial-card{background:#fff;padding:32px;border-radius:var(--radius-md);box-shadow:var(--shadow-sm);border:1px solid var(--border-light)}.landing-page .quote{font-size:1.1rem;color:var(--text-main);margin-bottom:24px;font-style:italic}.author{display:flex;align-items:center;gap:12px}.avatar{width:40px;height:40px;background:var(--primary-end);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700}.author div{display:flex;flex-direction:column;font-size:.9rem}.author span{color:var(--text-muted);font-size:.8rem}.lead-magnet-section{padding:60px 0}.lead-magnet-banner{background:linear-gradient(135deg,#f0f4ff,#e8f0fe);border-radius:var(--radius-lg);padding:24px 32px}.lead-magnet-banner-content{display:flex;flex-direction:column;align-items:center;text-align:center;gap:20px}.lead-magnet-banner-icon{width:56px;height:56px;background:#fff;border-radius:12px;display:flex;align-items:center;justify-content:center;color:var(--primary-start);box-shadow:0 2px 8px #667eea26;flex-shrink:0}.lead-magnet-banner-text h3{font-size:1.25rem;color:var(--text-main);margin-bottom:4px}.lead-magnet-banner-text p{color:var(--text-muted);font-size:.95rem;margin:0}@media(min-width:768px){.lead-magnet-banner-content{flex-direction:row;text-align:left}.lead-magnet-banner-text{flex:1}}.cta-section{padding:100px 0;text-align:center}.cta-box h2{font-size:2.5rem;margin-bottom:16px;color:var(--text-main)}.cta-box p{font-size:1.25rem;margin-bottom:32px;color:var(--text-muted)}.cta-box .email-signup{max-width:460px;margin:0 auto 16px}.cta-box .micro-copy{color:#fffc}@media(min-width:768px){.hero-grid{grid-template-columns:1.1fr .9fr}.landing-page .features-grid{grid-template-columns:repeat(3,1fr)}.landing-page .testimonials-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:767px){.landing-page h1{font-size:2rem}.landing-page h2{font-size:1.75rem}.hero-section{padding:40px 0 60px}.hero-subtext{font-size:1.1rem}.lang-pills{gap:8px}.lang-pills span{font-size:.85rem;padding:5px 10px}.feature-card,.testimonial-card{padding:24px}.visual-bg-glow{display:none}.email-signup{flex-direction:column}.landing-page .btn.large{width:100%}.demo-cards-grid{transform:none;gap:16px;grid-template-columns:1fr}.hero-visual{padding:0 20px}}@media(max-width:480px){.landing-page h1{font-size:1.6rem;letter-spacing:-.5px}.landing-page h2{font-size:1.4rem}.hero-section{padding:32px 0 48px}.hero-subtext{font-size:1rem}.lang-pills{gap:6px}.lang-pills span{font-size:.75rem;padding:4px 8px}.feature-card,.testimonial-card{padding:20px}.pill-badge{font-size:.75rem;padding:4px 10px}.cta-box h2{font-size:1.5rem}.cta-box p{font-size:.95rem}.email-signup .btn{font-size:.85rem;padding:10px 16px}}.language-selector{position:relative;display:flex;align-items:center;gap:.5rem}.language-label{color:var(--gray-500);font-size:.875rem;font-weight:500}.language-select{appearance:none;background:var(--gray-100);border:1px solid var(--gray-200);color:var(--gray-700);padding:.5rem 2rem .5rem .75rem;border-radius:6px;font-size:.95rem;cursor:pointer;transition:background-color .2s,border-color .2s;min-height:40px;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12' fill='%236b7280'%3E%3Cpath d='M6 8L2 4h8z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .5rem center}.language-select:hover{background-color:var(--gray-200);border-color:var(--gray-300)}.language-select:focus{outline:none;border-color:var(--primary-500);box-shadow:0 0 0 2px #667eea33}.language-select option{background:#fff;color:var(--gray-700);padding:.75rem}.language-selector-loading{color:var(--gray-400);padding:.5rem 1rem;font-size:.875rem}@media(max-width:768px){.language-selector{width:100%;flex-direction:column;align-items:stretch;gap:.5rem}.language-label{color:var(--gray-600);font-size:.9rem}.language-select{width:100%;padding:.875rem 2.5rem .875rem 1rem;font-size:1rem;background-color:var(--gray-50);border-radius:8px;min-height:48px}.language-select:hover{background-color:var(--gray-100)}}.app{min-height:100vh;display:flex;flex-direction:column}.navbar{background:#fff;border-bottom:1px solid var(--gray-200);box-shadow:0 1px 3px #0000000d}.app-nav-container{max-width:1400px;margin:0 auto;padding:var(--space-4) var(--space-6);display:flex;justify-content:space-between;align-items:center}.logo{font-size:1.5rem;font-weight:700;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-decoration:none;display:flex;align-items:center;gap:var(--space-2);transition:opacity var(--transition-fast)}.logo:hover{opacity:.9}.hamburger{display:none;flex-direction:column;justify-content:space-between;width:28px;height:20px;background:transparent;border:none;cursor:pointer;padding:0;z-index:105}.hamburger span{display:block;width:100%;height:3px;background:var(--gray-700);border-radius:3px;transition:all .3s ease}.hamburger.open span:nth-child(1){transform:rotate(45deg) translate(6px,6px)}.hamburger.open span:nth-child(2){opacity:0}.hamburger.open span:nth-child(3){transform:rotate(-45deg) translate(6px,-6px)}.nav-menu{display:flex;align-items:center;gap:var(--space-8)}.nav-links{display:flex;gap:var(--space-6)}.nav-link{color:var(--gray-600);text-decoration:none;font-weight:500;font-size:1rem;padding:var(--space-2) var(--space-4);border-radius:var(--radius-md);transition:background-color var(--transition-fast),color var(--transition-fast);min-height:44px;display:flex;align-items:center}.nav-link:hover{background-color:var(--gray-100);color:var(--gray-900)}.nav-user{display:flex;align-items:center;gap:var(--space-4)}.user-email{color:var(--gray-600);font-size:.875rem}.logout-button{background:transparent;border:1px solid var(--gray-300);color:var(--gray-600);padding:var(--space-2) var(--space-4);border-radius:var(--radius-md);font-weight:500;cursor:pointer;transition:background-color var(--transition-fast),border-color var(--transition-fast),color var(--transition-fast);min-height:44px;font-size:.9rem}.logout-button:hover{background:var(--gray-100);border-color:var(--gray-400);color:var(--gray-900)}.nav-overlay{display:none}.loading{display:flex;justify-content:center;align-items:center;min-height:200px;color:var(--gray-500);font-size:1rem}.main-content{flex:1;padding:var(--space-6) 0}.footer{background-color:var(--gray-800);color:#fff;text-align:center;padding:var(--space-6);margin-top:auto}.footer p{font-size:.9rem;opacity:.8}@media(max-width:900px){.nav-links{gap:var(--space-4)}.nav-user{gap:var(--space-3)}.user-email{display:none}}@media(max-width:768px){.app-nav-container{padding:var(--space-4)}.hamburger{display:flex}.nav-menu{position:fixed;top:0;right:-100%;width:80%;max-width:320px;height:100vh;background:#fff;flex-direction:column;align-items:stretch;justify-content:flex-start;padding:80px var(--space-6) var(--space-6);gap:var(--space-8);transition:right .3s ease;z-index:104;box-shadow:-4px 0 20px #0000001a}.nav-menu.open{right:0}.nav-links{flex-direction:column;gap:var(--space-2)}.nav-link{padding:var(--space-4);font-size:1.1rem;border-radius:var(--radius-md);background:var(--gray-50);color:var(--gray-700)}.nav-link:hover{background:var(--gray-100);color:var(--gray-900)}.nav-user{flex-direction:column;align-items:stretch;gap:var(--space-4);padding-top:var(--space-4);border-top:1px solid var(--gray-200)}.user-email{display:block;text-align:center;font-size:.9rem;color:var(--gray-600)}.logout-button{width:100%;padding:var(--space-4);font-size:1rem;text-align:center;background:var(--gray-100);border-color:var(--gray-300);color:var(--gray-700)}.logout-button:hover{background:var(--gray-200)}.nav-overlay{display:block;position:fixed;inset:0;background:#00000080;z-index:103}.main-content{padding:var(--space-4) 0}.footer{padding:var(--space-4)}.footer p{font-size:.8rem}}@media(max-width:480px){.logo{font-size:1.25rem}.nav-menu{width:85%}}