:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --text: #0f172a;
    --text-light: #64748b;
    --bg-light: #f8fafc;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Inter', sans-serif; color: var(--text); line-height: 1.6; }

.demo-return { position: fixed; bottom: 20px; right: 20px; background: var(--text); color: white; padding: 10px 20px; border-radius: 8px; text-decoration: none; font-weight: 600; font-size: 0.9rem; z-index: 999; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* Nav */
nav { border-bottom: 1px solid #e2e8f0; padding: 15px 0; background: white; position: sticky; top: 0; z-index: 50; }
.nav-wrapper { display: flex; justify-content: space-between; align-items: center; position: relative; }
.logo { font-weight: 700; font-size: 1.2rem; color: var(--primary); display: flex; align-items: center; gap: 8px; }

/* Menu Desktop */
.menu { display: flex; align-items: center; }
.menu a { text-decoration: none; color: var(--text-light); font-size: 0.9rem; margin-left: 20px; font-weight: 500; }
.menu a:hover { color: var(--primary); }

/* Hamburger (Hidden on Desktop) */
.hamburger { display: none; font-size: 1.5rem; color: var(--text); cursor: pointer; }

/* Buttons */
.btn { padding: 10px 20px; border-radius: 6px; text-decoration: none; font-weight: 500; font-size: 0.9rem; transition: 0.2s; display: inline-block; }
.btn-primary { background: var(--primary); color: white !important; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-outline { border: 1px solid #e2e8f0; color: var(--text); }
.btn-white { background: white; color: var(--primary); }

/* Hero */
.hero { padding: 80px 0; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.badge { background: #dbeafe; color: var(--primary); padding: 4px 12px; border-radius: 50px; font-size: 0.8rem; font-weight: 600; margin-bottom: 20px; display: inline-block; }
.hero h1 { font-size: 3.5rem; line-height: 1.1; margin-bottom: 20px; letter-spacing: -1.5px; }
.hero p { color: var(--text-light); font-size: 1.1rem; margin-bottom: 30px; }
.btn-group { display: flex; gap: 10px; }
.hero-img img { width: 100%; border-radius: 12px; box-shadow: 0 20px 50px -10px rgba(0,0,0,0.15); transition: transform 0.3s; }
.hero-img:hover img { transform: translateY(-5px); }

/* Features */
.features { background: var(--bg-light); padding: 80px 0; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.card { background: white; padding: 30px; border-radius: 12px; border: 1px solid #e2e8f0; transition: 0.2s; }
.card:hover { transform: translateY(-5px); border-color: var(--primary); }
.icon-box { width: 45px; height: 45px; background: #eff6ff; color: var(--primary); display: flex; align-items: center; justify-content: center; border-radius: 8px; margin-bottom: 20px; }

/* CTA */
.cta { background: var(--primary); color: white; text-align: center; padding: 80px 0; margin-top: 50px; }
.cta h2 { font-size: 2rem; margin-bottom: 10px; }
.cta p { opacity: 0.9; margin-bottom: 30px; }

/* --- MOBILE RESPONSIVENESS --- */
@media (max-width: 768px) {
    .nav-wrapper { justify-content: space-between; }
    
    .hamburger { display: block; }

    .menu {
        display: none; /* Hide by default */
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
        border-top: 1px solid #eee;
    }

    .menu.active { display: flex; }

    .menu a {
        margin: 10px 0;
        margin-left: 0;
        width: 100%;
    }

    .menu .btn { width: 100%; text-align: center; margin-top: 10px; }

    .hero-grid { grid-template-columns: 1fr; text-align: center; gap: 40px; }
    .hero h1 { font-size: 2.5rem; }
    .btn-group { justify-content: center; }
}