body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #f4f5f7;
    color: #222;
}

main {
    max-width: 720px;
    margin: 60px auto;
    padding: 32px;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
}

h1 {
    margin-top: 0;
}

.instructions {
    margin-bottom: 24px;
    line-height: 1.5;
}

.upload-form {
    display: grid;
    gap: 16px;
}

.upload-field {
    display: grid;
    gap: 8px;
}

button {
    width: fit-content;
    padding: 10px 18px;
    font-size: 1rem;
    cursor: pointer;
}

.error-message {
    padding: 12px 14px;
    margin-bottom: 20px;
    border: 1px solid #b00020;
    background: #fff3f4;
    color: #7a0015;
    border-radius: 4px;
}

.help-text {
    font-size: 0.9rem;
    color: #555;
}

footer {
    margin-top: 32px;
    padding-top: 16px;
    border-top: 1px solid #ddd;
    font-size: 0.85rem;
    color: #666;
}

.session-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid #ddd;
    font-size: 0.9rem;
}

.session-bar form {
    margin: 0;
}

.logout-button {
    padding: 6px 12px;
    font-size: 0.9rem;
}

.login-page {
    max-width: 480px;
}

.login-form {
    display: grid;
    gap: 16px;
}

.login-field {
    display: grid;
    gap: 8px;
}

.login-field input {
    padding: 10px;
    font-size: 1rem;
}

.success-message {
    padding: 12px 14px;
    margin-bottom: 20px;
    border: 1px solid #4f6f52;
    background: #f3f8f3;
    border-radius: 4px;
}