:root{--primary:#2563eb;--primary-dark:#1e40af;--secondary:#f59e0b;--accent:#10b981;--dark:#1e293b;--light:#f8fafc;--gray:#64748b;--light-gray:#e2e8f0;--danger:#ef4444;--shadow:0 6px 18px rgba(0,0,0,.08)}
    *{box-sizing:border-box}
    body{margin:0;background:linear-gradient(180deg, rgba(15,23,42,0.75), rgba(15,23,42,0.75)), url('https://www.shutterstock.com/image-photo/automotive-engineer-working-on-electric-600nw-2204219067.jpg') center/cover fixed;color:var(--dark);font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif; padding-top:90px}
    /* Fixed Navbar (enhanced) */
    .main-nav{position:fixed;top:0;left:0;width:100%;background:linear-gradient(180deg,rgba(255,255,255,.9),rgba(255,255,255,.82));backdrop-filter:saturate(1.2) blur(8px);box-shadow:0 10px 30px rgba(2,6,23,.12);border-bottom:1px solid rgba(148,163,184,.25);z-index:1000;padding:15px 0;transition:all .3s ease}
    .main-nav.scrolled{padding:15px 0;background:linear-gradient(180deg,rgba(255,255,255,.98),rgba(255,255,255,.94));box-shadow:0 12px 32px rgba(2,6,23,.16)}
    .nav-container{display:flex;justify-content:space-between;align-items:center}
    .nav-logo{display:flex;align-items:center;gap:12px;font-weight:700;font-size:1.5rem;color:#1e40af}
    .nav-logo svg{width:40px;height:40px}
    .nav-menu{display:flex;list-style:none;gap:30px}
    .nav-menu a{color:var(--dark);font-weight:600;position:relative;text-decoration:none;padding:8px 6px;border-radius:6px;transition:all .3s ease}
    .nav-menu a::after{content:'';position:absolute;bottom:-6px;left:0;width:0;height:2px;background:var(--primary);transition:all .3s ease}
    .nav-menu a:hover::after,.nav-menu a.active::after{width:100%}
    .nav-menu a.active{color:var(--primary)}
    .nav-menu a:hover{background:rgba(37,99,235,.08)}
    .nav-actions{display:flex;gap:15px;margin-left:36px;position:relative}
    .nav-actions::before{content:'';position:absolute;left:-18px;top:50%;transform:translateY(-50%);width:1px;height:28px;background:rgba(148,163,184,.5)}
    .btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 24px;border-radius:8px;font-weight:600;cursor:pointer;transition:all .3s ease;border:none;gap:8px}
    .btn-primary{background:var(--primary);color:#fff}
    .btn-outline{background:transparent;border:2px solid var(--primary);color:var(--primary)}
    .btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -1px rgba(0,0,0,.06)}
    .btn-outline:hover{background:var(--primary);color:#fff}
    .nav-toggle{display:none;flex-direction:column;cursor:pointer}
    .nav-toggle span{width:25px;height:3px;background-color:var(--dark);margin:2px 0;transition:all .3s ease}
    @media(max-width:768px){
      .nav-menu{position:fixed;top:70px;left:-100%;background:#fff;width:80%;height:calc(100vh - 70px);flex-direction:column;padding:40px 20px;box-shadow:5px 0 15px rgba(0,0,0,.1);transition:all .3s ease}
      .nav-menu.active{left:0}
      .nav-toggle{display:flex}
      .nav-toggle.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
      .nav-toggle.active span:nth-child(2){opacity:0}
      .nav-toggle.active span:nth-child(3){transform:rotate(-45deg) translate(7px,-6px)}
    }
    .container{max-width:1100px;margin:0 auto;padding:24px}
    .page{background:#fff;border-radius:16px;box-shadow:var(--shadow);margin:24px auto;padding:28px}
    h1{margin:0 0 8px}
    .lead{color:var(--gray);margin:0 0 16px}
    .grid{display:grid;grid-template-columns:1.2fr .8fr;gap:24px}
    @media (max-width:900px){.grid{grid-template-columns:1fr}}
    .section{border:1px solid var(--light-gray);border-radius:12px;padding:18px}
    .section h3{margin:0 0 12px}
    label{font-weight:600;display:block;margin:10px 0 6px}
    input, select, textarea{width:100%;padding:12px 14px;border:1px solid var(--light-gray);border-radius:10px}
    textarea{min-height:90px}
    .row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
    @media (max-width:600px){.row{grid-template-columns:1fr}}
    .btn{background:var(--primary);color:#fff;border:none;border-radius:10px;padding:12px 16px;cursor:pointer}
    .btn-secondary{background:var(--secondary)}
    .pill{display:inline-block;background:#eef2ff;color:#3730a3;border-radius:999px;padding:4px 10px;font-size:.85rem;margin-right:6px}
    .est-card{background:#f8fafc;border:1px dashed var(--light-gray);border-radius:12px;padding:16px}
    .est-price{font-size:1.8rem;color:var(--primary-dark);font-weight:800}
    .qa{margin-top:14px}
    .qa .q{font-weight:600}
    .hidden{display:none}