:root {
    --bg-color: #1a1a1a;
    --card-bg-color: #2a2a2a;
    --text-color: #e0e0e0;
    --accent-color: #4a90e2;
    --secondary-color: #6ab0f3;
    --error-color: #ff6b6b;
    --input-bg-color: #3a3a3a;
}

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    box-sizing: border-box;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 600px;
    padding: 2rem;
}

h1 {
    text-align: center;
    color: var(--accent-color);
    font-size: 2.5rem;
    margin-bottom: 2rem;
    font-weight: 300;
    letter-spacing: 1px;
}

.card {
    background-color: var(--card-bg-color);
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 2rem;
    margin-bottom: 2rem;
    transition: box-shadow 0.3s ease;
}

.card:hover {
    box-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
}

.file-input, .form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--accent-color);
}

input[type="file"] {
    width: 0.1px;
    height: 0.1px;
    opacity: 0;
    overflow: hidden;
    position: absolute;
    z-index: -1;
}

input[type="file"] + label {
    font-size: 1rem;
    color: var(--bg-color);
    background-color: var(--accent-color);
    display: inline-block;
    padding: 0.75rem 1.25rem;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    text-align: center;
    width: 100%;
    box-sizing: border-box;
}

input[type="file"]:focus + label,
input[type="file"] + label:hover {
    background-color: var(--secondary-color);
}

input[type="file"] + label::before {
    content: '📁 ';
    margin-right: 5px;
}

select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--secondary-color);
    border-radius: 6px;
    font-size: 1rem;
    background-color: var(--input-bg-color);
    color: var(--text-color);
    transition: border-color 0.3s ease;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23007CB2%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
    background-repeat: no-repeat;
    background-position: right 0.7rem top 50%;
    background-size: 0.65rem auto;
    padding-right: 2rem;
}

select:focus {
    outline: none;
    border-color: var(--accent-color);
}

button {
    background-color: var(--accent-color);
    color: var(--bg-color);
    border: none;
    padding: 1rem;
    font-size: 1rem;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.3s ease, transform 0.1s ease;
}

button:hover {
    background-color: var(--secondary-color);
}

button:active {
    transform: scale(0.98);
}

#status {
    margin-top: 1rem;
    font-weight: 500;
    color: var(--accent-color);
    text-align: center;
}

.instructions h2 {
    color: var(--accent-color);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 400;
}

.instructions ol {
    padding-left: 1.5rem;
    margin: 0;
}

.instructions li {
    margin-bottom: 0.75rem;
}

@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }

    .card {
        padding: 1.5rem;
    }

    h1 {
        font-size: 2rem;
    }
}