body {
    padding-top: 84px;
    background-color: #1d1d1d;
}

#main-header {
    padding-top: 30px;
    padding-bottom: 10px;
}

#main-header h1 {
    font-size: clamp(20px, 3vw, 30px);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: #f45950;
    padding: 0;
    margin: 0 0 20px;
}

h2 {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: #f45950;
    padding: 16px 0 12px;
    margin: 0;
}

.thumbnail {
    padding: 24px;
    border-radius: 12px;
}

/* file input — keep browser default appearance */
#myFile {
    display: block;
    background-color: #f2f2f2;
    color: #1a1a1a;
    border: 1px solid #c0c0c0;
    border-radius: 4px;
    padding: 6px 8px;
    margin: 8px 0 16px;
}

#submit-button {
    margin: 12px 0 0;
    padding: 8px 32px;
    background-color: #f45950;
    border: none;
    border-radius: 6px;
    color: #0f0f0f;
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

#submit-button:hover {
    background-color: #e62c21;
}

body > .container {
    position: relative;
    min-height: calc(100vh - 84px);
    padding-bottom: 70px;
}

footer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    margin: 0;
}