body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif, "Microsoft JhengHei";
    color: #333;
    line-height: 1.6;
}

.navbar {
    padding-top: 1rem;
    padding-bottom: 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,.08);
}

.navbar-brand {
    font-weight: 800;
    color: #007bff !important;
    font-size: 1.5rem;
    letter-spacing: 1px;
}

.nav-link {
    font-weight: 500;
    color: #444 !important;
    padding: 0.5rem 1rem !important;
    transition: color 0.2s;
}

.nav-link:hover {
    color: #007bff !important;
}

.btn-primary {
    background-color: #007bff;
    border-color: #007bff;
    padding: 0.5rem 1.5rem;
    font-weight: 600;
}

.card {
    border-radius: 12px;
}

.transition {
    transition: all 0.3s ease;
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 1rem 3rem rgba(0,0,0,.1) !important;
}

html {
    scroll-behavior: smooth;
}

section {
    scroll-margin-top: 80px;
}