body {
    background-color: #f5f7fb;
    font-family: Arial, sans-serif;
}

/* NAVBAR */

.navbar-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: white !important;
}

.menu-link {
    font-weight: 500;
}

/* HERO */

.hero {
    background: linear-gradient(135deg, #0d6efd, #0a58ca);
    color: white;
    padding: 80px 0;
    border-radius: 0 0 30px 30px;
}

.hero-title {
    font-size: 3rem;
    font-weight: bold;
}

.hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* CARDS */

.tool-card {
    border: none;
    border-radius: 20px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.08);
    transition: 0.3s;
}

.tool-card:hover {
    transform: translateY(-5px);
}

/* UPLOAD */

.upload-box {
    border: 2px dashed #0d6efd;
    border-radius: 20px;
    padding: 40px;
    background: white;
}

/* PREVIEW */

.preview-container {
    background: white;
    border-radius: 20px;
    padding: 20px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.08);
}

/* IFRAME */

.pdf-frame {
    border: none;
    border-radius: 15px;
    width: 100%;
    height: 800px;
}

/* FOOTER */

.footer {
    margin-top: 100px;
    padding: 30px;
    background: #111827;
    color: white;
    text-align: center;
}

/* BUTTONS */

.btn-primary {
    border-radius: 12px;
}

.btn-success {
    border-radius: 12px;
}

/* RESPONSIVE */

@media (max-width: 768px) {

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .pdf-frame {
        height: 500px;
    }

}