:root {
    --primary-color: #7C3AED;
    --secondary-color: #F3E8FF;
    --background-color: #FFFFFF;
    --surface-color: #F9FAFB;
    --text-color: #111827;
    --heading-font: 'Poppins', sans-serif;
    --body-font: 'Inter', sans-serif;
}

html.dark {
    --primary-color: #A78BFA;
    --secondary-color: #37304A;
    --background-color: #111827;
    --surface-color: #1F2937;
    --text-color: #F9FAFB;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: var(--body-font);
    transition: background-color 0.3s, color 0.3s;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--heading-font);
    font-weight: 700;
}

.navbar {
    transition: background-color 0.3s;
}
.navbar.bg-body-tertiary {
    background-color: var(--background-color) !important;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    transition: all 0.3s ease;
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.hero-section {
    background: linear-gradient(45deg, rgba(124, 58, 237, 0.1), rgba(167, 139, 250, 0.1));
}

html.dark .hero-section {
    background: linear-gradient(45deg, rgba(167, 139, 250, 0.1), rgba(55, 48, 74, 0.2));
}

.service-card {
    background-color: var(--surface-color);
    border: 1px solid transparent;
    transition: all 0.3s ease;
}
.service-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

/* Fade-in Animation */
.fade-in-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-up-visible {
    opacity: 1;
    transform: translateY(0);
}

.theme-toggle-btn {
    cursor: pointer;
}