/* ===========================
   Base Styling
=========================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f0f2f5;
    color: #333;
    line-height: 1.5;
    min-height: 100vh;
}

/* ===========================
   Header
=========================== */
header {
    background-color: #131313;
    color: white;
    text-align: center;
    padding: 2rem 1rem;
}

/* ===========================
   Footer
=========================== */
footer {
    text-align: center;
    padding: 1rem;
    background-color: #ddd;
    position: relative; /* allows scrollable content */
    width: 100%;
}

/* ===========================
   Main Wrapper
=========================== */
.main-wrapper {
    display: flex;                /* flex container */
    justify-content: center;      /* horizontal centering */
    align-items: center;          /* vertical centering */
    flex-direction: column;       /* stack elements vertically */
    min-height: calc(100vh - 150px); /* fill viewport minus header/footer */
    padding: 2rem 1rem;
    margin: 0 auto;
    text-align: center;
}

/* ===========================
   Intro Section
=========================== */
.intro h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.intro h3 {
    font-size: 1.5rem;
    color: #555;
}

/* ===========================
   Responsive adjustments
=========================== */
@media (max-width: 600px) {
    .intro h1 {
        font-size: 2rem;
    }
    .intro h3 {
        font-size: 1.2rem;
    }
}