```css
/* style.css */

*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

html{
    scroll-behavior:smooth;
}

body{
    font-family:Arial, Helvetica, sans-serif;
    color:#1f2937;
    background:#fff;
    line-height:1.7;
}

.container{
    width:90%;
    max-width:1100px;
    margin:auto;
}

/* ==========================
   Header
========================== */

header{
    position:fixed;
    width:100%;
    top:0;
    left:0;
    background:#ffffffee;
    backdrop-filter:blur(10px);
    box-shadow:0 2px 10px rgba(0,0,0,.05);
    z-index:1000;
}

.nav{
    display:flex;
    justify-content:space-between;
    align-items:center;
    height:70px;
}

.logo{
    font-size:1.6rem;
    font-weight:bold;
    color:#2563eb;
    letter-spacing:2px;
}

nav{
    display:flex;
    gap:28px;
}

nav a{
    text-decoration:none;
    color:#374151;
    transition:.25s;
}

nav a:hover{
    color:#2563eb;
}

/* ==========================
   Hero
========================== */

.hero{
    min-height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
    text-align:center;
    background:linear-gradient(180deg,#ffffff,#eef6ff);
}

.hero-content h1{
    font-size:clamp(3rem,7vw,5.5rem);
    line-height:1.1;
    margin-bottom:25px;
}

.hero-content p{
    max-width:700px;
    margin:auto;
    color:#4b5563;
    font-size:1.15rem;
}

.btn{
    display:inline-block;
    margin-top:40px;
    background:#2563eb;
    color:white;
    text-decoration:none;
    padding:15px 36px;
    border-radius:50px;
    transition:.25s;
}

.btn:hover{
    background:#1d4ed8;
}

/* ==========================
   Sections
========================== */

section{
    padding:100px 0;
}

section h2{
    font-size:2.3rem;
    margin-bottom:25px;
}

section p{
    margin-bottom:18px;
    color:#4b5563;
}

.gray{
    background:#f8fafc;
}

/* ==========================
   Cards
========================== */

.cards{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
    gap:25px;
    margin-top:40px;
}

.card{
    background:white;
    padding:30px;
    border-radius:18px;
    box-shadow:0 10px 30px rgba(0,0,0,.08);
    transition:.3s;
}

.card:hover{
    transform:translateY(-6px);
}

.card h3{
    color:#2563eb;
    margin-bottom:15px;
}

/* ==========================
   Business
========================== */

ul{
    margin-left:25px;
}

li{
    margin-bottom:15px;
}

/* ==========================
   Contact
========================== */

.contact{
    background:#2563eb;
    color:white;
}

.contact p{
    color:white;
}

/* ==========================
   Footer
========================== */

footer{
    background:#111827;
    color:#d1d5db;
    text-align:center;
    padding:40px;
}

/* ==========================
   Mobile
========================== */

@media(max-width:768px){

.nav{
    flex-direction:column;
    height:auto;
    padding:20px 0;
}

nav{
    margin-top:15px;
    gap:18px;
    flex-wrap:wrap;
    justify-content:center;
}

.hero{
    padding:120px 0 80px;
}

.hero-content h1{
    font-size:2.8rem;
}

section{
    padding:70px 0;
}

}
```