*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif;background:#0f172a;color:#e2e8f0}
a{color:#38bdf8;text-decoration:none}
.container{max-width:960px;margin:0 auto;padding:16px}
.card{background:#111827;border:1px solid #1f2937;border-radius:12px;padding:16px}
.btn{display:inline-block;padding:10px 14px;border-radius:8px;border:0;background:#38bdf8;color:#0b1220;font-weight:600;cursor:pointer}
.btn.secondary{background:#334155;color:#e2e8f0}
.btn.block{width:100%}
.input{width:100%;padding:12px;border-radius:8px;border:1px solid #334155;background:#0b1220;color:#e2e8f0}
.input:focus{outline:none;border-color:#38bdf8}
.mt-2{margin-top:8px}
.mt-3{margin-top:12px}
.mt-4{margin-top:16px}
.mb-2{margin-bottom:8px}
.mb-3{margin-bottom:12px}
.mb-4{margin-bottom:16px}
.grid{display:grid;gap:16px}
@media(min-width:640px){.grid.cols-2{grid-template-columns:repeat(2,1fr)}}
.nav{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:#0b1220;border-bottom:1px solid #1f2937;position:sticky;top:0;z-index:1000}
.brand{font-weight:800;color:#38bdf8;font-size:18px}
.brand a{color:#38bdf8;text-decoration:none}
.toggle{display:flex;flex-direction:column;justify-content:space-around;width:44px;height:44px;background:#1f2937;border:2px solid #374151;border-radius:8px;cursor:pointer;padding:10px 8px;z-index:1001;position:relative;box-shadow:0 2px 4px rgba(0,0,0,0.3),inset 0 1px 0 rgba(255,255,255,0.1);transition:all 0.2s ease}
.toggle:hover{background:#374151;border-color:#475569;box-shadow:0 3px 6px rgba(0,0,0,0.4),inset 0 1px 0 rgba(255,255,255,0.15)}
.toggle:active{transform:scale(0.95);box-shadow:0 1px 2px rgba(0,0,0,0.3),inset 0 1px 0 rgba(255,255,255,0.05)}
.toggle span{width:100%;height:4px;background:#e2e8f0;border-radius:3px;transition:all 0.3s cubic-bezier(0.68,-0.55,0.265,1.55);transform-origin:center;box-shadow:0 1px 2px rgba(0,0,0,0.2)}
.toggle.active{background:#0ea5e9;border-color:#38bdf8;box-shadow:0 2px 4px rgba(14,165,233,0.4),inset 0 1px 0 rgba(255,255,255,0.2)}
.toggle.active span{background:#fff;box-shadow:0 1px 2px rgba(0,0,0,0.3)}
.toggle.active span:nth-child(1){transform:rotate(45deg) translate(10px,10px)}
.toggle.active span:nth-child(2){opacity:0;transform:translateX(-10px)}
.toggle.active span:nth-child(3){transform:rotate(-45deg) translate(10px,-10px)}
.menu-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,0.6);backdrop-filter:blur(2px);z-index:1001;opacity:0;visibility:hidden;transition:opacity 0.2s ease,visibility 0.2s ease}
.menu-overlay.active{opacity:1;visibility:visible}
.menu{display:flex;flex-direction:column;gap:12px;padding:20px;position:fixed;top:0;right:-100%;width:280px;height:100vh;background:#0b1220;border-left:2px solid #1f2937;z-index:1002;transition:right 0.3s cubic-bezier(0.4,0,0.2,1);box-shadow:-4px 0 24px rgba(0,0,0,0.4);overflow-y:auto}
.menu.open{right:0}
.nav-btn-3d{display:inline-block;padding:12px 20px;font-weight:600;font-size:14px;text-align:center;text-decoration:none;color:#e2e8f0;background:#1f2937;border:2px solid;border-color:#374151 #111827 #111827 #374151;border-radius:8px;cursor:pointer;transition:all 0.15s ease;position:relative;box-shadow:inset 0 1px 0 rgba(255,255,255,0.1),0 2px 4px rgba(0,0,0,0.3),0 4px 8px rgba(0,0,0,0.2);text-transform:uppercase;letter-spacing:0.5px}
.nav-btn-3d:active{transform:translateY(2px);box-shadow:inset 0 1px 0 rgba(255,255,255,0.05),0 1px 2px rgba(0,0,0,0.3),0 2px 4px rgba(0,0,0,0.2);border-color:#111827 #374151 #374151 #111827}
.nav-btn-3d:hover{background:#374151;color:#38bdf8;border-color:#475569 #1f2937 #1f2937 #475569;box-shadow:inset 0 1px 0 rgba(255,255,255,0.15),0 3px 6px rgba(0,0,0,0.4),0 6px 12px rgba(0,0,0,0.3)}
.nav-btn-primary{background:#0ea5e9;color:#0b1220;border-color:#38bdf8 #0284c7 #0284c7 #38bdf8;box-shadow:inset 0 1px 0 rgba(255,255,255,0.3),0 2px 4px rgba(14,165,233,0.3),0 4px 8px rgba(14,165,233,0.2)}
.nav-btn-primary:hover{background:#38bdf8;color:#0b1220;border-color:#7dd3fc #0ea5e9 #0ea5e9 #7dd3fc;box-shadow:inset 0 1px 0 rgba(255,255,255,0.4),0 3px 6px rgba(14,165,233,0.4),0 6px 12px rgba(14,165,233,0.3)}
.nav-btn-primary:active{border-color:#0284c7 #38bdf8 #38bdf8 #0284c7}
.nav-btn-danger{background:#dc2626;color:#fff;border-color:#ef4444 #b91c1c #b91c1c #ef4444;box-shadow:inset 0 1px 0 rgba(255,255,255,0.2),0 2px 4px rgba(220,38,38,0.3),0 4px 8px rgba(220,38,38,0.2)}
.nav-btn-danger:hover{background:#ef4444;color:#fff;border-color:#f87171 #dc2626 #dc2626 #f87171;box-shadow:inset 0 1px 0 rgba(255,255,255,0.3),0 3px 6px rgba(220,38,38,0.4),0 6px 12px rgba(220,38,38,0.3)}
.nav-btn-danger:active{border-color:#b91c1c #ef4444 #ef4444 #b91c1c}
body.menu-open{overflow:hidden}
@media(min-width:768px){
  .menu{position:static;right:auto;width:auto;height:auto;flex-direction:row;gap:10px;padding:0;background:transparent;border:none;box-shadow:none;overflow:visible}
  .menu.open{right:auto}
  .nav-btn-3d{padding:10px 18px;font-size:13px}
  .menu-overlay{display:none}
  .toggle{display:none}
  body.menu-open{overflow:auto}
}
.hero{padding:48px 0;text-align:center}
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.stat{background:#111827;border:1px solid #1f2937;border-radius:12px;padding:14px;text-align:center}
.error{background:#7f1d1d;color:#fee2e2;border:1px solid #991b1b;border-radius:8px;padding:10px}
.success{background:#064e3b;color:#d1fae5;border:1px solid #065f46;border-radius:8px;padding:10px}

.chat-wrap{display:flex;flex-direction:column;height:70vh}
.chat-header{display:flex;align-items:center;gap:12px;padding-bottom:8px;border-bottom:1px solid #1f2937}
.chat-messages{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:8px}
.bubble{max-width:80%;padding:10px 12px;border-radius:14px;word-wrap:break-word}
.bubble.user{margin-left:auto;background:#38bdf8;color:#0b1220;border-top-right-radius:6px}
.bubble.agent{margin-right:auto;background:#334155;color:#e2e8f0;border-top-left-radius:6px}
.chat-input{display:flex;gap:8px;padding-top:8px;border-top:1px solid #1f2937}
.chat-input .input{flex:1}
@media(min-width:768px){.chat-wrap{height:75vh}.bubble{max-width:60%}}