* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', sans-serif;
}

body {
    background: #0f172a;
    color: white;
    line-height: 1.6;
}

/* Header */

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 10%;
    background: rgba(255,255,255,0.05);
    backdrop-filter: blur(10px);
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #00d4ff;
}

nav a {
    margin-left: 20px;
    text-decoration: none;
    color: white;
    transition: 0.3s;
}

nav a:hover {
    color: #00d4ff;
}

/* Sections */

section {
    padding: 80px 10%;
}

.hero {
    text-align: center;
    padding: 120px 10%;
    background: linear-gradient(135deg, #1e293b, #0f172a);
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
}

.hero p {
    max-width: 600px;
    margin: auto;
    opacity: 0.8;
}

.btn {
    display: inline-block;
    margin-top: 30px;
    padding: 14px 28px;
    border-radius: 10px;
    background: linear-gradient(45deg, #00c6ff, #0072ff);
    color: white;
    text-decoration: none;
    font-weight: bold;
    transition: 0.3s;
}

.btn:hover {
    transform: translateY(-3px);
}

/* Cards */

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.card {
    background: #1e293b;
    padding: 30px;
    border-radius: 15px;
    transition: 0.3s;
}

.card:hover {
    transform: translateY(-5px);
}

/* Calculator */

.calculator-box {
    max-width: 500px;
    margin: auto;
    background: #1e293b;
    padding: 40px;
    border-radius: 20px;
}

input, select, textarea {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    border-radius: 8px;
    border: none;
}

button {
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    background: #00d4ff;
    color: #000;
    font-weight: bold;
    cursor: pointer;
}

footer {
    text-align: center;
    padding: 30px;
    background: #0b1120;
    margin-top: 50px;
}

@media(max-width:768px){
    header {
        flex-direction: column;
    }

    nav {
        margin-top: 15px;
    }
}