:root{--bg:#f7f8fa;--card-bg:#fff;--text:#1a1a2e;--text-secondary:#5a5a7a;--primary:#4f46e5;--primary-light:#eef2ff;--accent:#06b6d4;--border:#e5e7eb;--shadow:0 1px 3px #0000000d, 0 8px 30px #0000000f;--shadow-lg:0 4px 6px #0000000a, 0 12px 40px #00000014;--radius:16px;--radius-sm:10px}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Roboto,sans-serif;line-height:1.7}.container{max-width:1200px;margin:0 auto;padding:0 24px}nav{z-index:100;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);background:#ffffffd9;position:fixed;top:0;left:0;right:0}nav .container{justify-content:space-between;align-items:center;height:60px;display:flex}nav .logo{color:var(--primary);align-items:center;gap:8px;font-size:20px;font-weight:800;text-decoration:none;display:flex}nav .logo span{background:var(--primary);color:#fff;border-radius:6px;padding:2px 8px;font-size:13px}nav a.nav-link{color:var(--text-secondary);margin-left:32px;font-size:14px;font-weight:500;text-decoration:none;transition:color .2s}nav a.nav-link:hover,nav a.nav-link.active{color:var(--primary)}.hero{text-align:center;padding:140px 0 80px}.hero .badge{background:var(--primary-light);color:var(--primary);border-radius:20px;margin-bottom:20px;padding:6px 16px;font-size:13px;font-weight:600;display:inline-block}.hero h1{letter-spacing:-.02em;background:linear-gradient(135deg,#1a1a2e 0%,#4f46e5 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:48px;font-weight:800;line-height:1.3}.hero p{color:var(--text-secondary);max-width:560px;margin:16px auto 32px;font-size:18px}.hero .btn-group{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.btn{cursor:pointer;border:none;border-radius:10px;align-items:center;gap:6px;padding:14px 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.2s}.feature-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}.feature-card .icon{border-radius:12px;justify-content:center;align-items:center;width:48px;height:48px;margin-bottom:16px;font-size:24px;display:flex}.feature-card .icon.blue{background:#eef2ff}.feature-card .icon.green{background:#ecfdf5}.feature-card .icon.amber{background:#fffbeb}.feature-card .icon.cyan{background:#ecfeff}.feature-card .icon.purple{background:#f5f3ff}.feature-card .icon.rose{background:#fff1f2}.feature-card h3{margin-bottom:8px;font-size:17px;font-weight:600}.feature-card p{color:var(--text-secondary);font-size:14px}.chat-preview{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow-lg);cursor:pointer;color:inherit;text-decoration:none;transition:transform .25s,box-shadow .25s;display:block;position:relative;overflow:hidden}.chat-preview:hover{transform:translateY(-4px);box-shadow:0 8px 16px #0000000f,0 20px 50px #4f46e51f}.chat-preview-header{color:#fff;background:linear-gradient(135deg,#4f46e5 0%,#7c3aed 100%);align-items:center;gap:12px;padding:18px 28px;display:flex}.chat-preview-header .avatar{background:#fff3;border-radius:10px;justify-content:center;align-items:center;width:40px;height:40px;font-size:20px;display:flex}.chat-preview-header h3{font-size:16px;font-weight:600}.chat-preview-header p{opacity:.8;font-size:12px}.chat-preview-body{background:#fafbff;min-height:320px;padding:28px 32px;position:relative}.chat-bubble{gap:10px;max-width:80%;margin-bottom:18px;display:flex}.chat-bubble.ai{align-items:flex-start}.chat-bubble.user{flex-direction:row-reverse;margin-left:auto}.chat-bubble .bubble-avatar{border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;font-size:15px;display:flex}.chat-bubble.ai .bubble-avatar{background:#eef2ff}.chat-bubble.user .bubble-avatar{color:#fff;background:#4f46e5;font-size:13px}.chat-bubble .msg{border-radius:14px;padding:12px 16px;font-size:13px;line-height:1.6}.chat-bubble.ai .msg{border:1px solid var(--border);background:#fff;border-top-left-radius:4px}.chat-bubble.user .msg{color:#fff;background:#4f46e5;border-top-right-radius:4px}.typing{gap:4px;padding:4px 0;display:flex}.typing span{background:#c4b5fd;border-radius:50%;width:7px;height:7px;animation:1.4s ease-in-out infinite both bounce}.typing span:first-child{animation-delay:-.32s}.typing span:nth-child(2){animation-delay:-.16s}@keyframes bounce{0%,80%,to{transform:scale(.6)}40%{transform:scale(1)}}.chat-overlay{opacity:0;background:#ffffffb3;justify-content:center;align-items:center;transition:opacity .3s;display:flex;position:absolute;inset:0}.chat-preview:hover .chat-overlay{opacity:1}.chat-overlay .overlay-btn{background:var(--primary);color:#fff;border-radius:10px;padding:14px 36px;font-size:16px;font-weight:600;box-shadow:0 8px 30px #4f46e54d}.cta{border-radius:var(--radius);text-align:center;color:#fff;background:linear-gradient(135deg,#1a1a2e 0%,#312e81 100%);padding:64px 48px}.cta h2{font-size:28px;font-weight:700}.cta p{color:#ffffffb3;margin:12px 0 28px;font-size:15px}.stats-row{grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:60px;display:grid}@media (width<=768px){.stats-row{grid-template-columns:repeat(2,1fr)}}.stat-card{background:var(--card-bg);border-radius:var(--radius-sm);box-shadow:var(--shadow);text-align:center;padding:24px}.stat-card .num{background:linear-gradient(135deg, var(--primary), var(--accent));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:30px;font-weight:800}.stat-card .label{color:var(--text-secondary);margin-top:4px;font-size:13px}footer{border-top:1px solid var(--border);text-align:center;color:#999;padding:32px 0;font-size:13px}.chat-page{flex-direction:column;height:100vh;display:flex}.topbar{border-bottom:1px solid 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