:root{--primary: #2830d3;--primary-light: #4a51e8;--primary-dark: #1e25b0;--primary-glow: rgba(40,48,211,.25);--accent: #00d4ff;--accent2: #7c3aed;--success: #18bc37;--danger: #ff4757;--bg: #0a0b1a;--bg2: #0f1128;--bg3: #161831;--card: #12142a;--card2: #1a1d3a;--border: rgba(255,255,255,.08);--text: #f0f1ff;--text-muted: #7b7fa8;--text-dim: #4a4e7a;--sidebar-w: 72px;--chat-list-w: 260px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:Inter,sans-serif;background:var(--bg);color:var(--text);overflow-x:hidden;line-height:1.6}nav{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;align-items:center;justify-content:space-between;padding:0 5%;height:68px;background:#0a0b1ab3;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);transition:background .3s}.nav-logo{display:flex;align-items:center;gap:10px;text-decoration:none}.nav-logo-icon{width:36px;height:36px;border-radius:10px;overflow:hidden;flex-shrink:0}.nav-logo-icon img{width:100%;height:100%;object-fit:cover;display:block}.nav-logo-name{font-family:Space Grotesk,sans-serif;font-weight:700;font-size:1.2rem;background:linear-gradient(90deg,#fff,var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent}.nav-right{display:flex;align-items:center;gap:24px}.nav-links{display:flex;align-items:center;gap:28px;list-style:none}.nav-links a{text-decoration:none;color:var(--text-muted);font-size:.9rem;font-weight:500;transition:color .2s}.nav-links a:hover{color:var(--text)}.lang-switcher{position:relative}.lang-btn{display:flex;align-items:center;gap:6px;background:#ffffff0f;border:1px solid var(--border);border-radius:8px;padding:6px 12px;color:var(--text-muted);font-size:.8rem;font-weight:500;cursor:pointer;transition:background .2s,border-color .2s,color .2s;white-space:nowrap}.lang-btn:hover{background:#ffffff1a;border-color:#fff3;color:var(--text)}.lang-btn svg{flex-shrink:0}.lang-dropdown{display:none;position:absolute;top:calc(100% + 8px);right:0;background:var(--card2);border:1px solid var(--border);border-radius:10px;overflow:hidden;min-width:140px;box-shadow:0 16px 40px #00000080;z-index:200}.lang-switcher.open .lang-dropdown{display:block}.lang-option{display:flex;align-items:center;gap:10px;padding:10px 14px;font-size:.85rem;color:var(--text-muted);cursor:pointer;transition:background .15s,color .15s}.lang-option:hover{background:#ffffff0f;color:var(--text)}.lang-option.active{color:var(--accent);background:#00d4ff0f}.lang-flag{font-size:16px}.nav-cta{display:flex;gap:10px;align-items:center}.btn-outline{padding:8px 18px;border-radius:8px;border:1px solid var(--border);color:var(--text);background:transparent;font-size:.875rem;font-weight:500;cursor:pointer;text-decoration:none;transition:border-color .2s,background .2s}.btn-outline:hover{border-color:var(--primary-light);background:#2830d31a}.btn-primary{padding:8px 20px;border-radius:8px;background:var(--primary);color:#fff;border:none;font-size:.875rem;font-weight:600;cursor:pointer;text-decoration:none;transition:background .2s,box-shadow .2s;box-shadow:0 0 20px var(--primary-glow)}.btn-primary:hover{background:var(--primary-light);box-shadow:0 0 30px var(--primary-glow)}.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:4px}.hamburger span{display:block;width:24px;height:2px;background:var(--text);border-radius:2px;transition:all .3s}.mobile-menu{display:none;position:fixed;top:68px;left:0;right:0;background:#0a0b1af7;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);flex-direction:column;padding:20px 5%;gap:4px;z-index:99}.mobile-menu.open{display:flex}.mobile-menu a{text-decoration:none;color:var(--text-muted);font-size:1rem;font-weight:500;padding:10px 0;border-bottom:1px solid var(--border)}.mobile-menu a:last-child{border-bottom:none}.mobile-lang-row{display:flex;gap:8px;padding:10px 0;flex-wrap:wrap}.mobile-lang-btn{padding:6px 12px;border-radius:6px;border:1px solid var(--border);background:transparent;color:var(--text-muted);font-size:.8rem;cursor:pointer;transition:all .2s}.mobile-lang-btn.active{background:#2830d333;border-color:var(--primary);color:var(--accent)}.hero{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:120px 5% 80px;position:relative;overflow:hidden;text-align:center}.hero-bg{position:absolute;top:0;right:0;bottom:0;left:0;z-index:0;background:radial-gradient(ellipse 70% 50% at 50% 0%,rgba(40,48,211,.35) 0%,transparent 70%),radial-gradient(ellipse 50% 40% at 80% 60%,rgba(0,212,255,.1) 0%,transparent 60%),radial-gradient(ellipse 40% 30% at 20% 80%,rgba(124,58,237,.12) 0%,transparent 60%)}.hero-grid{position:absolute;top:0;right:0;bottom:0;left:0;z-index:0;background-image:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);background-size:60px 60px;-webkit-mask-image:radial-gradient(ellipse 80% 80% at 50% 50%,black 20%,transparent 80%);mask-image:radial-gradient(ellipse 80% 80% at 50% 50%,black 20%,transparent 80%)}.hero-content{position:relative;z-index:1;max-width:760px}.hero-badge{display:inline-flex;align-items:center;gap:8px;background:#2830d326;border:1px solid rgba(40,48,211,.4);border-radius:100px;padding:6px 16px;font-size:.8rem;font-weight:500;color:var(--accent);margin-bottom:28px}.hero-badge-dot{width:6px;height:6px;border-radius:50%;background:var(--accent);animation:pulse-dot 2s infinite}@keyframes pulse-dot{0%,to{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.8)}}h1{font-family:Space Grotesk,sans-serif;font-size:clamp(2.4rem,6vw,4.2rem);font-weight:700;line-height:1.12;letter-spacing:-.02em;margin-bottom:24px}h1 .highlight{background:linear-gradient(90deg,var(--primary-light),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent}.hero-desc{font-size:clamp(1rem,2.5vw,1.15rem);color:var(--text-muted);max-width:560px;margin:0 auto 40px}.hero-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;width:100%;max-width:min(680px,100%);margin:0 auto 56px;justify-items:stretch}.hero-actions .btn-lg{width:100%;min-height:52px;justify-content:center;box-sizing:border-box}@media(min-width:720px){.hero-actions{grid-template-columns:repeat(4,minmax(0,1fr));max-width:min(920px,100%)}}.btn-lg{padding:14px 20px;border-radius:10px;font-size:1rem;font-weight:600;display:flex;align-items:center;gap:10px}.btn-download-win{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border:none;cursor:pointer;text-decoration:none;border-radius:10px;box-shadow:0 8px 32px #2830d366;transition:transform .2s,box-shadow .2s}.btn-download-win:hover{transform:translateY(-2px);box-shadow:0 12px 40px #2830d380}.btn-download-mac{background:#ffffff0f;color:#fff;border:1px solid var(--border);cursor:pointer;text-decoration:none;border-radius:10px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transition:background .2s,border-color .2s,transform .2s}.btn-download-mac:hover{background:#ffffff1a;border-color:#fff3;transform:translateY(-2px)}.btn-download-android{background:linear-gradient(135deg,#3ddc84,#1da462);color:#0a1a0f;border:none;cursor:pointer;text-decoration:none;border-radius:10px;box-shadow:0 8px 32px #3ddc8459;transition:transform .2s,box-shadow .2s}.btn-download-android:hover{transform:translateY(-2px);box-shadow:0 12px 40px #3ddc8480}.btn-download-ios{background:#ffffff0d;color:var(--text-muted);border:1px dashed rgba(255,255,255,.18);cursor:pointer;text-decoration:none;border-radius:10px;transition:background .2s,border-color .2s,color .2s,transform .2s}.btn-download-ios:hover{background:#ffffff14;border-color:#ffffff47;color:var(--text);transform:translateY(-2px)}.hero-stats{display:flex;gap:48px;justify-content:center;flex-wrap:wrap}.stat-item{text-align:center}.stat-num{font-family:Space Grotesk,sans-serif;font-size:1.8rem;font-weight:700;background:linear-gradient(90deg,#fff,var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent}.stat-label{font-size:.8rem;color:var(--text-muted);margin-top:2px}.preview-section{padding:40px 5% 100px;display:flex;justify-content:center;position:relative}.app-mockup{width:100%;max-width:900px;background:var(--card);border:1px solid var(--border);border-radius:20px;overflow:hidden;box-shadow:0 0 0 1px var(--border),0 40px 100px #0009,0 0 80px #2830d326;position:relative}.mockup-titlebar{height:38px;background:var(--bg2);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 16px;gap:8px}.titlebar-dot{width:12px;height:12px;border-radius:50%}.dot-red{background:#ff5f57}.dot-yellow{background:#ffbd2e}.dot-green{background:#28c840}.titlebar-title{flex:1;text-align:center;font-size:.75rem;color:var(--text-dim)}.mockup-body{display:flex;height:520px}.mock-sidebar{width:var(--sidebar-w);background:var(--bg2);border-right:1px solid var(--border);display:flex;flex-direction:column;align-items:center;padding:16px 0;gap:8px}.mock-avatar{width:42px;height:42px;border-radius:12px;overflow:hidden;margin-bottom:8px;flex-shrink:0}.mock-avatar img{width:100%;height:100%;object-fit:cover;display:block}.mock-nav-item{width:44px;height:44px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:20px;cursor:pointer;position:relative;transition:background .2s}.mock-nav-item.active{background:#2830d34d}.mock-nav-item svg{width:22px;height:22px}.mock-badge{position:absolute;top:4px;right:4px;width:16px;height:16px;border-radius:8px;background:var(--danger);font-size:10px;display:flex;align-items:center;justify-content:center;font-weight:700;color:#fff}.mock-chat-list{width:var(--chat-list-w);background:var(--bg3);border-right:1px solid var(--border);overflow:hidden}.mock-list-header{height:56px;display:flex;align-items:center;padding:0 16px;gap:10px;border-bottom:1px solid var(--border)}.mock-search{flex:1;height:32px;background:var(--card2);border-radius:8px;border:none;display:flex;align-items:center;padding:0 10px;gap:6px}.mock-search-icon{font-size:14px;color:var(--text-dim)}.mock-search-text{font-size:12px;color:var(--text-dim);pointer-events:none}.mock-chat-item{display:flex;align-items:center;gap:10px;padding:10px 14px;cursor:pointer;transition:background .15s}.mock-chat-item.active{background:#2830d326;border-left:2px solid var(--primary)}.mock-chat-item:hover:not(.active){background:var(--card2)}.mock-item-avatar{width:40px;height:40px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:600;color:#fff}.mock-item-info{flex:1;min-width:0}.mock-item-name{font-size:13px;font-weight:500;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.mock-item-preview{font-size:11px;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:2px}.mock-item-meta{display:flex;flex-direction:column;align-items:flex-end;gap:4px}.mock-item-time{font-size:10px;color:var(--text-dim)}.mock-unread{background:var(--primary);color:#fff;border-radius:10px;font-size:10px;font-weight:700;padding:1px 6px;min-width:18px;text-align:center}.mock-chat-area{flex:1;display:flex;flex-direction:column;background:var(--bg)}.mock-chat-header{height:56px;display:flex;align-items:center;padding:0 20px;gap:12px;border-bottom:1px solid var(--border)}.mock-chat-header-avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#6366f1,#8b5cf6);display:flex;align-items:center;justify-content:center;font-size:14px;color:#fff;font-weight:600}.mock-chat-header-name{font-size:14px;font-weight:600;color:var(--text)}.mock-chat-header-status{font-size:11px;color:var(--success)}.mock-chat-messages{flex:1;overflow:hidden;padding:16px 20px;display:flex;flex-direction:column;gap:14px}.mock-msg{display:flex;align-items:flex-end;gap:10px}.mock-msg.right{flex-direction:row-reverse}.mock-msg-avatar{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;color:#fff;flex-shrink:0}.mock-msg-bubble{max-width:65%;padding:9px 14px;border-radius:16px;font-size:12px;line-height:1.5}.mock-msg.left .mock-msg-bubble{background:var(--card2);color:var(--text);border-bottom-left-radius:4px}.mock-msg.right .mock-msg-bubble{background:var(--primary);color:#fff;border-bottom-right-radius:4px}.mock-input-area{height:54px;display:flex;align-items:center;padding:0 16px;gap:10px;border-top:1px solid var(--border);background:var(--bg2)}.mock-input-tools{display:flex;gap:8px}.mock-tool-btn{width:28px;height:28px;border-radius:6px;background:var(--card2);display:flex;align-items:center;justify-content:center;font-size:14px;cursor:pointer}.mock-input-field{flex:1;height:34px;background:var(--card2);border-radius:8px;border:1px solid var(--border);padding:0 12px;font-size:12px;color:var(--text-dim);display:flex;align-items:center}.mock-send-btn{width:34px;height:34px;border-radius:8px;background:var(--primary);display:flex;align-items:center;justify-content:center;cursor:pointer;color:#fff;font-size:16px}.mockup-glow{position:absolute;width:300px;height:300px;border-radius:50%;background:radial-gradient(circle,rgba(40,48,211,.3),transparent 70%);filter:blur(40px);bottom:-80px;right:-60px;pointer-events:none}section{padding:100px 5%}.section-label{display:inline-block;font-size:.75rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-bottom:16px}h2{font-family:Space Grotesk,sans-serif;font-size:clamp(1.8rem,4vw,2.8rem);font-weight:700;line-height:1.2;letter-spacing:-.02em;margin-bottom:16px}.section-desc{color:var(--text-muted);font-size:1.05rem;max-width:540px;margin-bottom:64px}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px}.feature-card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:28px;transition:border-color .3s,transform .3s,box-shadow .3s}.feature-card:hover{border-color:#2830d380;transform:translateY(-4px);box-shadow:0 20px 50px #0000004d,0 0 30px #2830d31a}.feature-icon{width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:20px}.feature-card h3{font-size:1.05rem;font-weight:600;margin-bottom:10px}.feature-card p{font-size:.875rem;color:var(--text-muted);line-height:1.65}.devices-section{background:var(--bg2);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}.devices-inner{display:flex;align-items:center;gap:80px;flex-wrap:wrap}.devices-text{flex:1;min-width:280px}.devices-visual{flex:1;min-width:320px;display:flex;gap:16px;align-items:flex-end;justify-content:center}.device-phone{width:140px;height:260px;background:var(--card);border:2px solid var(--border);border-radius:24px;overflow:hidden;box-shadow:0 20px 60px #0006;position:relative}.phone-notch{width:60px;height:12px;background:var(--bg2);border-radius:0 0 8px 8px;margin:0 auto}.phone-screen{padding:8px}.phone-chat-item{display:flex;align-items:center;gap:6px;padding:7px 6px;border-radius:8px;margin-bottom:3px}.phone-chat-item.active{background:#2830d333}.phone-avatar-sm{width:30px;height:30px;border-radius:50%;flex-shrink:0}.phone-text{flex:1}.phone-name{height:8px;background:var(--card2);border-radius:4px;margin-bottom:4px}.phone-msg{height:6px;background:var(--border);border-radius:4px;width:75%}.phone-bottom-bar{position:absolute;bottom:0;left:0;right:0;height:48px;background:var(--bg2);border-top:1px solid var(--border);display:flex;align-items:center;justify-content:space-around;font-size:18px}.phone-bottom-icon{opacity:.5}.phone-bottom-icon.active{opacity:1;color:var(--primary-light)}.device-tablet{width:200px;height:300px;background:var(--card);border:2px solid var(--border);border-radius:16px;overflow:hidden;box-shadow:0 20px 60px #0006}.tablet-bar{height:28px;background:var(--bg2);border-bottom:1px solid var(--border);display:flex;align-items:center;gap:6px;padding:0 10px}.tablet-dot{width:8px;height:8px;border-radius:50%}.tablet-body{display:flex;height:272px}.tablet-sidebar{width:44px;background:var(--bg3);border-right:1px solid var(--border);display:flex;flex-direction:column;align-items:center;padding-top:12px;gap:8px}.tablet-icon{width:28px;height:28px;border-radius:7px;background:var(--card2)}.tablet-icon.active{background:#2830d366}.tablet-content{flex:1;background:var(--bg);padding:8px}.tablet-msg-item{height:6px;background:var(--card2);border-radius:3px;margin-bottom:6px}.tablet-msg-item.short{width:60%}.tablet-msg-item.right{background:#2830d366;margin-left:auto;width:55%}.device-platform-tag{text-align:center;margin-top:12px;font-size:.75rem;color:var(--text-muted)}.device-wrap{display:flex;flex-direction:column;align-items:center}.devices-list{list-style:none;display:flex;flex-direction:column;gap:14px}.devices-list li{display:flex;align-items:center;gap:12px;font-size:.9rem}.devices-list .dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}.download-section{text-align:center;position:relative;overflow:hidden}.download-bg{position:absolute;top:0;right:0;bottom:0;left:0;z-index:0;background:radial-gradient(ellipse 60% 60% at 50% 50%,rgba(40,48,211,.2) 0%,transparent 70%)}.download-content{position:relative;z-index:1}.download-cards{display:flex;gap:20px;justify-content:center;flex-wrap:wrap;margin-top:48px;margin-bottom:24px}.download-card{background:var(--card);border:1px solid var(--border);border-radius:20px;padding:36px 40px;width:280px;min-width:0;text-align:center;display:flex;flex-direction:column;align-items:stretch;transition:border-color .3s,transform .3s,box-shadow .3s}.download-card:hover{border-color:var(--primary);transform:translateY(-6px);box-shadow:0 24px 60px #0006,0 0 40px #2830d326}.download-card-icon{width:72px;height:72px;border-radius:20px;display:flex;align-items:center;justify-content:center;font-size:36px;margin:0 auto 20px}.download-card h3{font-size:1.2rem;font-weight:700;margin-bottom:6px}.download-card .version{font-size:.8rem;color:var(--text-muted);margin-bottom:24px}.download-card .btn-download{margin-top:auto}.btn-download{display:inline-flex;align-items:center;gap:8px;width:100%;justify-content:center;box-sizing:border-box;min-height:52px;padding:12px 20px;border-radius:10px;font-size:.95rem;font-weight:600;text-decoration:none;transition:all .2s}.btn-download-windows{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;box-shadow:0 8px 24px #2830d359}.btn-download-windows:hover{background:linear-gradient(135deg,var(--primary-light),var(--primary));box-shadow:0 12px 32px #2830d380}.btn-download-macos{background:#ffffff14;color:#fff;border:1px solid var(--border)}.btn-download-macos:hover{background:#ffffff24;border-color:#ffffff40}.btn-download-android-card{background:linear-gradient(135deg,#3ddc84,#1da462);color:#0a1a0f;box-shadow:0 6px 20px #3ddc844d}.btn-download-android-card:hover{background:linear-gradient(135deg,#5ae89a,#3ddc84);box-shadow:0 10px 28px #3ddc8473}.btn-download-ios-card{background:#ffffff0f;color:var(--text-muted);border:1px dashed rgba(255,255,255,.2);cursor:pointer}.btn-download-ios-card:hover{background:#ffffff1a;border-color:#ffffff4d;color:var(--text)}.download-note{font-size:.8rem;color:var(--text-dim);margin-top:12px;min-height:2.75em}.dl-toast{position:fixed;bottom:32px;left:50%;transform:translate(-50%) translateY(120px);background:var(--card2);border:1px solid var(--border);padding:14px 28px;border-radius:12px;box-shadow:0 16px 48px #0000008c;z-index:400;font-size:.95rem;font-weight:500;color:var(--text);opacity:0;pointer-events:none;transition:transform .35s ease,opacity .35s ease}.dl-toast.visible{opacity:1;transform:translate(-50%) translateY(0)}.web-version-link{display:inline-flex;align-items:center;gap:6px;color:var(--primary-light);text-decoration:none;font-size:.9rem;font-weight:500;transition:color .2s}.web-version-link:hover{color:var(--accent)}footer{background:var(--bg2);border-top:1px solid var(--border);padding:48px 5% 32px}.footer-inner{display:flex;justify-content:space-between;flex-wrap:wrap;gap:40px;margin-bottom:40px}.footer-brand{max-width:280px}.footer-brand p{font-size:.85rem;color:var(--text-muted);margin-top:12px;line-height:1.7}.footer-links h4{font-size:.85rem;font-weight:600;color:var(--text);margin-bottom:16px}.footer-links ul{list-style:none;display:flex;flex-direction:column;gap:10px}.footer-links a{font-size:.85rem;color:var(--text-muted);text-decoration:none;transition:color .2s}.footer-links a:hover{color:var(--text)}.footer-bottom{border-top:1px solid var(--border);padding-top:24px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}.footer-bottom p{font-size:.8rem;color:var(--text-dim)}.reveal{opacity:0;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease}.reveal.visible{opacity:1;transform:translateY(0)}.reveal-delay-1{transition-delay:.1s}.reveal-delay-2{transition-delay:.2s}.reveal-delay-3{transition-delay:.3s}@media(max-width:960px){.nav-links{display:none}.hamburger{display:flex}.nav-cta .btn-outline{display:none}.mockup-body{height:420px}.mock-chat-list{display:none}}@media(max-width:680px){h1{font-size:2.2rem}.hero{padding:100px 5% 60px}.hero-stats{gap:28px}.mockup-body{height:360px}.mock-sidebar{width:52px}.mock-avatar{width:36px;height:36px;border-radius:9px}.mock-nav-item{width:36px;height:36px}.devices-inner{flex-direction:column}.devices-visual{flex-direction:column;align-items:center}.device-tablet{display:none}.download-card{width:100%;max-width:320px}.footer-inner{flex-direction:column;gap:32px}}@media(max-width:480px){section{padding:70px 5%}h2{font-size:1.7rem}.hero-actions{grid-template-columns:1fr;max-width:300px}.hero-actions .btn-lg{min-height:50px}.mockup-titlebar{display:none}.mockup-body{height:300px}}