:root {
    --grad-start: #6a5af9;
    --grad-end: #38b6ff;
}

body {
    background: linear-gradient(135deg, #6a5af9, #38b6ff 60%, #6bd4d0);
    min-height: 100vh;
}

.navbar-gradient {
    background: linear-gradient(90deg, var(--grad-start), var(--grad-end)) !important;
}

.app-card {
    background: #fff;
    border-radius: 1rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    padding: 2rem;
    max-width: 560px;
    margin: 5rem auto 3rem;
}

.app-card h1 {
    color: #3d3196;
    font-weight: 700;
    font-size: 1.75rem;
}

.btn-primary {
    background: linear-gradient(90deg, var(--grad-start), var(--grad-end));
    border: none;
}

.btn-primary:hover,
.btn-primary:focus {
    opacity: 0.9;
    background: linear-gradient(90deg, var(--grad-start), var(--grad-end));
}

.result-box {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: 0.5rem;
    background: #eef1ff;
    border-left: 4px solid var(--grad-start);
}

footer.footer {
    background: rgba(255, 255, 255, 0.85) !important;
}