body {
    font-family: "Roboto", sans-serif;
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    color: #333;
    margin: 0;
    padding: 0;
}
a {
    text-decoration: none;
}

.navbar {
    background: #0d253f;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}
.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
}
.nav-link {
    font-weight: 500;
}
.nav-link:hover,
.nav-link.active {
    color: #ff5500 !important;
}

.container-custom {
    margin-top: 4rem;
    margin-bottom: 4rem;
    background: #ffffff;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    animation: fadeIn 1s ease-out;
}
.section-title {
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-align: center;
    color: #0d253f;
}
.input-group .form-control {
    border: 2px solid #0d253f;
    border-radius: 0.5rem 0 0 0.5rem;
}
.btn-primary {
    border-radius: 0 0.5rem 0.5rem 0;
    background-color: #0d253f;
    border: none;
    transition: background-color 0.3s ease;
}
.btn-primary:hover {
    background-color: #f9a825;
}
.btn-success {
    border-radius: 0.5rem;
    background-color: #f9a825;
    border: none;
    transition: background-color 0.3s ease;
}
.btn-success:hover {
    background-color: #d18e00;
}

.thumbnail-container img {
    max-width: 100%;
    border-radius: 0.5rem;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
    animation: popIn 0.5s ease-out;
}
.thumbnail-container a {
    margin-top: 1rem;
}

footer {
    background: #0d253f;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}

@keyframes fadeIn {
    from {
         opacity: 0;
         transform: translateY(20px);
    }
    to {
         opacity: 1;
         transform: translateY(0);
    }
}
@keyframes popIn {
    from {
         opacity: 0;
         transform: scale(0.8);
    }
    to {
         opacity: 1;
         transform: scale(1);
    }
}

img {
    display: block;
    margin: 1rem auto;
}