:root {
    --color1: #253A4B;
    --color2: #5A7189;
    --color3: #9B884C;
    --color4: #253A4B;
    --color5: #E6E6E6;
}

body {
    background-color: var(--color5);
    color: var(--color1);
    font-family: system-ui, -apple-system, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header minimalista para una experiencia limpia en móviles/webview */
header {
    text-align: center;
    padding: 2rem 1rem 1rem 1rem;
}

header img {
    max-width: 180px;
    height: auto;
}

.upload-card {
    background-color: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    padding: 2rem;
    border-top: 4px solid var(--color3);
}

.btn-custom {
    background-color: var(--color3);
    color: #ffffff;
    border: none;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    width: 100%;
}

.btn-custom:hover {
    background-color: var(--color1);
    color: #ffffff;
}

.form-label {
    color: var(--color2);
    font-weight: 500;
}