:root{--bg-color: #0d1117;--text-color: #c9d1d9;--heading-color: #ffffff;--primary-color: #58a6ff;--primary-glow: rgba(88, 166, 255, .4);--secondary-color: #238636;--surface-color: rgba(22, 27, 34, .6);--border-color: #30363d;--glass-bg: rgba(13, 17, 23, .7);--alt-bg: #161b22}[data-theme=light]{--bg-color: #ffffff;--text-color: #57606a;--heading-color: #24292f;--primary-color: #0969da;--primary-glow: rgba(9, 105, 218, .3);--secondary-color: #2da44e;--surface-color: rgba(246, 248, 250, .8);--border-color: #d0d7de;--glass-bg: rgba(255, 255, 255, .8);--alt-bg: #f6f8fa}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Noto Sans,sans-serif;background-color:var(--bg-color);color:var(--text-color);line-height:1.6;transition:background-color .3s ease,color .3s ease;overflow-x:hidden}h1,h2,h3,h4{color:var(--heading-color);font-weight:700;line-height:1.2}a{color:var(--primary-color);text-decoration:none;transition:color .2s}.text-primary{color:var(--primary-color)}.text-gradient{background:linear-gradient(90deg,var(--primary-color),var(--secondary-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.section-padding{padding:6rem 2rem}.alternate-bg{background-color:var(--alt-bg)}.navbar{position:fixed;top:0;width:100%;z-index:100;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);background-color:var(--glass-bg);border-bottom:1px solid var(--border-color)}.nav-content{max-width:1200px;margin:0 auto;padding:1rem 2rem;display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:.5rem}.logo-icon{height:32px;width:auto}.logo-text{height:24px;width:auto}[data-theme=dark] .logo-text{filter:invert(1) hue-rotate(180deg) brightness(2)}.nav-links{display:flex;align-items:center;gap:2rem}.nav-links a{color:var(--text-color);font-weight:500}.nav-links a:hover{color:var(--primary-color)}.theme-btn{background:none;border:none;color:var(--text-color);font-size:1.2rem;cursor:pointer;display:flex;align-items:center;justify-content:center;padding:.5rem;border-radius:50%;transition:background .2s}.theme-btn:hover{background-color:var(--surface-color)}[data-theme=dark] .dark-icon,[data-theme=light] .light-icon{display:none}.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.75rem 1.5rem;border-radius:9999px;font-weight:600;font-size:1rem;cursor:pointer;border:none;transition:transform .2s,box-shadow .2s}.btn:hover{transform:translateY(-2px)}.btn-primary{background-color:var(--alt-bg);color:var(--primary-color);border:1px solid var(--primary-color);box-shadow:0 0 12px var(--primary-glow)}.btn-secondary{background-color:var(--surface-color);color:var(--heading-color);border:1px solid var(--border-color)}.hero{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:8rem 2rem 4rem;max-width:1200px;margin:0 auto}.badge{display:inline-block;padding:.25rem 1rem;border-radius:9999px;font-size:.875rem;font-weight:600;color:var(--primary-color);background-color:#58a6ff1a;border:1px solid var(--primary-color);margin-bottom:2rem}.hero-title{font-size:clamp(2.5rem,5vw,4.5rem);margin-bottom:1.5rem;letter-spacing:-.02em}.hero-subtitle{font-size:1.25rem;max-width:600px;margin:0 auto 3rem}.cta-group{display:flex;gap:1rem;justify-content:center;margin-bottom:4rem}.hero-visual{width:100%;display:flex;justify-content:center;align-items:center;gap:4rem;margin-top:2rem;flex-wrap:wrap}.phone-wrapper{position:relative;padding:10px 14px}.phone-mockup{width:320px;height:690px;background:linear-gradient(135deg,#a0a4a8,#d5d9df,#6a6f73,#b8bcc0,#44494d);padding:12px;border-radius:15px;position:relative;box-shadow:inset 0 0 4px #fffc,inset 0 0 10px #00000080,0 20px 50px -12px #0009,0 0 0 2px #555}.phone-mockup:before{content:"";position:absolute;top:130px;left:-4px;width:4px;height:35px;background:linear-gradient(to right,#999,#ccc);border-radius:4px 0 0 4px;box-shadow:0 50px #999}.phone-mockup:after{content:"";position:absolute;top:150px;right:-4px;width:4px;height:50px;background:linear-gradient(to left,#999,#ccc);border-radius:0 4px 4px 0}.phone-screen{width:100%;height:100%;border-radius:10px;overflow:hidden;position:relative;background:#000}.phone-screen:before{content:"";position:absolute;top:-10%;left:-50%;width:200%;height:120%;background:linear-gradient(to right,#fff0 30%,#ffffff0d,#fff0 70%);transform:rotate(25deg);pointer-events:none;z-index:100}.screenshot-img{width:100%;height:100%;object-fit:cover}.carousel-slide{position:absolute;top:0;left:0;width:100%;height:100%;opacity:0;pointer-events:none;transition:opacity .5s ease}.carousel-slide.active{opacity:1;pointer-events:auto}.split-screen{display:flex;flex-direction:column;height:100%;position:relative;padding:0;gap:4px;background-color:#000}.screen-half{flex:1;position:relative;padding:2rem 1.5rem;display:flex;flex-direction:column;align-items:center;justify-content:center}.top-half{background-color:#333;color:#fff;border-bottom-left-radius:20px;border-bottom-right-radius:20px;z-index:1}.bottom-half{background-color:#015f5e;color:#fff;border-top-left-radius:20px;border-top-right-radius:20px;z-index:1}.lang-flag{position:absolute;top:1rem;font-size:1.5rem;background:#fff;border-radius:4px;padding:2px 5px;line-height:1}.bottom-flag{top:auto;bottom:1rem}.translated-text{font-size:1.25rem;font-weight:600;text-align:center;line-height:1.4;margin:1rem 0;transition:opacity .5s ease}.rotated{transform:rotate(180deg)}.speaker-icon{position:absolute;width:36px;height:36px;background:#00000080;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.1rem}.bottom-speaker{top:2rem;left:2rem}.top-speaker{bottom:2rem;right:2rem}.speaker-icon.rotated{transform:rotate(180deg)}.middle-toolbar{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:#1e1e1e;padding:.4rem .8rem;border-radius:40px;display:flex;gap:.5rem;align-items:center;z-index:10;box-shadow:0 4px 10px #0000004d}.middle-toolbar button{background:#ffffff1a;border:none;color:#ccc;cursor:pointer;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:all .2s}.middle-toolbar button.small-btn{width:28px;height:28px;font-size:.9rem}.middle-toolbar button.active-btn{background:#ffb3b3;color:#8b0000;width:44px;height:44px;font-size:1.5rem}.middle-toolbar button:hover:not(.active-btn){color:#fff;background:#fff3}.mode-image-wrapper{width:100%;max-width:220px;margin:0 auto 1.5rem;border-radius:20px;overflow:hidden;box-shadow:0 10px 30px #00000080;border:4px solid #333}.mode-screenshot{width:100%;height:auto;display:block}.modes-container{display:flex;flex-direction:column;gap:2rem;max-width:900px;margin:0 auto}@media (min-width: 768px){.modes-container{flex-direction:row}.mode-card{flex:1}}.feature-discussion{flex:1;max-width:320px;background:var(--surface-color);border:1px solid var(--border-color);border-radius:24px;padding:2.5rem 2rem;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);display:flex;flex-direction:column;justify-content:center}.feature-content{display:none;animation:fadeIn .5s ease}.feature-content.active{display:block}.feature-content h3{font-size:2rem;margin-bottom:1rem;color:var(--primary-color)}.feature-content p{font-size:1.1rem;color:var(--text-color);line-height:1.6}.carousel-indicators{display:flex;gap:.8rem;margin-top:2rem}.indicator{width:12px;height:12px;border-radius:50%;background-color:var(--border-color);border:none;cursor:pointer;transition:background-color .3s}.indicator.active{background-color:var(--primary-color)}.explorer-mockup{width:100%;height:100%;background:url(https://images.unsplash.com/photo-1542051841857-5f90071e7989?ixlib=rb-4.0.3&auto=format&fit=crop&w=600&q=80) center/cover;position:relative;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:2rem}.explorer-mockup:before{content:"";position:absolute;top:0;left:0;width:100%;height:100%;background:#0009}.explorer-header,.explorer-content{position:relative;z-index:2}.explorer-header{font-size:1.5rem;font-weight:700;color:#fff;margin-bottom:2rem}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.section-header{text-align:center;margin-bottom:4rem}.section-header h2{font-size:2.5rem;margin-bottom:1rem}.bento-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem;max-width:1200px;margin:0 auto}.glass-card{background:var(--surface-color);border:1px solid var(--border-color);border-radius:24px;padding:2rem;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transition:transform .3s ease,border-color .3s ease}.glass-card:hover{transform:translateY(-5px);border-color:var(--primary-color)}.card-icon{font-size:2.5rem;color:var(--primary-color);margin-bottom:1.5rem}.glass-card h3{margin-bottom:.75rem;font-size:1.25rem}@media (min-width: 768px){.col-span-2{grid-column:span 2}}.steps-container{display:flex;flex-direction:column;gap:2rem;max-width:800px;margin:0 auto}@media (min-width: 768px){.steps-container{flex-direction:row;justify-content:space-between}}.step-item{flex:1;text-align:center}.step-number{width:50px;height:50px;background:var(--primary-color);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:700;margin:0 auto 1.5rem}.step-item h4{font-size:1.25rem;margin-bottom:.5rem}.footer{border-top:1px solid var(--border-color);padding:3rem 2rem;background-color:var(--bg-color)}.footer-content{max-width:1200px;margin:0 auto;display:flex;flex-direction:column;gap:2rem;align-items:center}@media (min-width: 768px){.footer-content{flex-direction:row;justify-content:space-between}}.footer-brand{display:flex;align-items:center;gap:.5rem;font-size:1.25rem;font-weight:700;color:var(--heading-color)}.footer-links{display:flex;gap:1.5rem}.footer-links a{color:var(--text-color);font-size:.9rem}.footer-links a:hover{color:var(--primary-color)}.footer-copyright{text-align:center;margin-top:2rem;font-size:.8rem;color:var(--text-color)}.dashboard-container{max-width:1200px;margin:0 auto;min-height:calc(100vh - 80px);display:flex;flex-direction:column}.login-box{max-width:400px;margin:4rem auto;text-align:center;padding:3rem 2rem}.hidden{display:none!important}.dashboard-header{margin-bottom:2rem}.dashboard-header p{color:var(--text-secondary)}.dashboard-grid{display:grid;grid-template-columns:1fr;gap:2rem}@media (min-width: 768px){.dashboard-grid{grid-template-columns:1fr 1fr}}.dashboard-panel{padding:2rem;display:flex;flex-direction:column;min-height:400px}.data-list{margin-top:1.5rem;display:flex;flex-direction:column;gap:1rem;overflow-y:auto;max-height:500px;padding-right:.5rem}.data-list::-webkit-scrollbar{width:6px}.data-list::-webkit-scrollbar-track{background:transparent}.data-list::-webkit-scrollbar-thumb{background:var(--surface-light);border-radius:4px}.data-item{background:#ffffff08;border:1px solid rgba(255,255,255,.05);border-radius:12px;padding:1rem;transition:all .3s ease}.data-item:hover{background:#ffffff0d;border-color:#ffffff1a;transform:translateY(-2px)}.item-header{display:flex;justify-content:space-between;margin-bottom:.5rem;font-size:.85rem;color:var(--text-secondary)}.item-text{font-weight:500;margin-bottom:.25rem;color:var(--text-primary)}.item-translation{color:var(--primary-color);font-size:.95rem}#user-info{font-size:.9rem;color:var(--text-secondary);display:flex;align-items:center;gap:.5rem}.user-avatar{width:24px;height:24px;border-radius:50%}.app-layout{display:flex;gap:2rem;align-items:flex-start}@media (max-width: 768px){.app-layout{flex-direction:column}}.sidebar{flex:0 0 250px;padding:1rem 0;position:sticky;top:100px}.side-nav{display:flex;flex-direction:column;gap:.5rem}.nav-btn{background:transparent;border:none;color:var(--text-secondary);padding:1rem 1.5rem;text-align:left;font-size:1rem;cursor:pointer;transition:all .2s;display:flex;align-items:center;gap:.75rem;border-radius:0 24px 24px 0;margin-right:1rem}.nav-btn:hover{color:var(--text-primary);background:#ffffff0d}.nav-btn.active{color:var(--primary-color);background:#4299e11a;border-left:4px solid var(--primary-color)}.main-content{flex:1;min-width:0}.settings-form{max-width:600px}.form-group{margin-bottom:1.5rem}.form-group label{display:block;margin-bottom:.5rem;color:var(--text-secondary);font-size:.9rem}.form-control{width:100%;padding:.75rem 1rem;background:#0003;border:1px solid rgba(255,255,255,.1);border-radius:8px;color:var(--text-primary);font-size:1rem;transition:border-color .2s}.form-control:focus{outline:none;border-color:var(--primary-color)}.custom-dropdown{position:relative;width:100%;outline:none;cursor:pointer;font-size:1rem}.dropdown-header{width:100%;padding:.75rem 1rem;background:#1e1e1e;border:2px solid #333;border-radius:20px;color:var(--primary-color);display:flex;justify-content:space-between;align-items:center;font-weight:700;transition:all .2s}.custom-dropdown.open .dropdown-header{border-bottom-left-radius:0;border-bottom-right-radius:0;border-color:var(--primary-color)}.dropdown-list{position:absolute;top:100%;left:0;width:100%;background:#e2dfdb;color:#000;z-index:100;border:2px solid var(--primary-color);border-top:none;border-bottom-left-radius:20px;border-bottom-right-radius:20px;overflow:hidden;box-shadow:0 10px 20px #00000080}.dropdown-item{padding:.75rem 1rem;font-weight:600;text-align:center;transition:background .2s,color .2s}.dropdown-item:hover,.dropdown-item.selected{background:var(--primary-color);color:#fff}.btn-sm{padding:.4rem .8rem;font-size:.85rem}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#000000b3;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);display:flex;align-items:center;justify-content:center;z-index:1000}.modal-content{background:var(--surface-light);border:1px solid rgba(255,255,255,.1);border-radius:12px;width:90%;max-width:500px;padding:2rem;box-shadow:0 10px 30px #00000080}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem}.modal-header h2{margin:0;font-size:1.25rem}.modal-close{background:transparent;border:none;color:var(--text-secondary);font-size:1.5rem;cursor:pointer}.modal-close:hover{color:var(--text-primary)}.flashcard-container{perspective:1000px;width:100%;max-width:600px;margin:0 auto 2rem}.flashcard{background:var(--surface-light);border:1px solid rgba(255,255,255,.1);border-radius:16px;padding:3rem 2rem;text-align:center;min-height:250px;display:flex;flex-direction:column;justify-content:center;align-items:center;box-shadow:0 8px 32px #0003;transition:transform .6s;position:relative}.flashcard h3{font-size:1.5rem;margin-bottom:1rem;font-weight:400}.flashcard .translation{color:var(--primary-color);font-size:1.25rem;margin-top:1rem;padding-top:1rem;border-top:1px dashed rgba(255,255,255,.1);width:100%}.grade-buttons{display:flex;gap:.5rem;justify-content:center;flex-wrap:wrap}.grade-btn{flex:1;padding:.75rem;border-radius:8px;border:none;font-weight:600;cursor:pointer;transition:opacity .2s;color:#fff}.grade-btn:hover{opacity:.8}.grade-again{background:#e53e3e}.grade-hard{background:#dd6b20}.grade-good{background:#38a169}.grade-easy{background:#3182ce}.spreadsheet-table{width:100%;border-collapse:collapse;min-width:1800px}.spreadsheet-table th,.spreadsheet-table td{border:1px solid var(--border-color);padding:0;text-align:left;height:40px;min-width:150px}.spreadsheet-table th{background:#0000004d;color:var(--text-secondary);padding:.5rem 1rem;font-weight:600;position:sticky;top:0;z-index:10}.spreadsheet-table th:first-child,.spreadsheet-table td:first-child{min-width:60px;width:60px;text-align:center}.spreadsheet-table th:nth-child(2),.spreadsheet-table td:nth-child(2){min-width:250px}.spreadsheet-table input{width:100%;height:100%;background:transparent;border:none;color:var(--text-color);padding:.5rem 1rem;outline:none;font-family:inherit;font-size:.95rem}.spreadsheet-table input:focus{background:#58a6ff1a}.spreadsheet-table .actions-td{text-align:center;min-width:60px}.spreadsheet-table .delete-row-btn{background:transparent;border:none;color:#e53e3e;cursor:pointer;font-size:1.2rem;opacity:.7;transition:opacity .2s}.spreadsheet-table .delete-row-btn:hover{opacity:1}