/* site.css */
html {
    font-size: 14px;
}

@media (min-width: 768px) {
    html {
        font-size: 16px;
    }
}

body {
    background-color: #f4f6f9;
    font-family: 'Segoe UI', Roboto, "Helvetica Neue", Arial, sans-serif;
    color: #333;
}

.navbar-brand {
    font-weight: 600;
    letter-spacing: 0.5px;
}

.main-card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    background: #fff;
    overflow: hidden;
    transition: transform 0.3s ease;
}

    .main-card:hover {
        transform: translateY(-2px);
    }

.card-header-custom {
    background: linear-gradient(135deg, #0d6efd 0%, #0a58ca 100%);
    color: white;
    padding: 1.5rem;
    border-bottom: none;
}

.upload-zone {
    border: 2px dashed #dee2e6;
    border-radius: 10px;
    padding: 3rem 1rem;
    text-align: center;
    cursor: pointer;
    background-color: #f8f9fa;
    transition: all 0.3s ease;
    position: relative;
}

    .upload-zone:hover, .upload-zone.dragover {
        border-color: #0d6efd;
        background-color: #e9ecef;
        color: #0d6efd;
    }

    .upload-zone i {
        font-size: 3rem;
        color: #adb5bd;
        margin-bottom: 1rem;
        transition: color 0.3s ease;
    }

    .upload-zone:hover i {
        color: #0d6efd;
    }

.file-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.btn-convert {
    padding: 0.8rem 2rem;
    font-weight: 600;
    border-radius: 30px;
    box-shadow: 0 4px 6px rgba(13, 110, 253, 0.2);
    transition: all 0.2s;
}

    .btn-convert:hover {
        transform: translateY(-1px);
        box-shadow: 0 6px 12px rgba(13, 110, 253, 0.3);
    }

.step-icon {
    width: 40px;
    height: 40px;
    line-height: 40px;
    background: #e7f1ff;
    color: #0d6efd;
    border-radius: 50%;
    text-align: center;
    font-weight: bold;
    margin-bottom: 10px;
    display: inline-block;
}