/* Frontend Design System */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --dark-color: #0f172a;
    --light-color: #f8fafc;
    --white: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(255, 255, 255, 0.2);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: "Inter", sans-serif;
    background-color: #f1f5f9;
    color: var(--dark-color);
    line-height: 1.6;
}

/* Header & Navigation */
.main-header {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
}

.navbar-brand {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--dark-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.navbar-brand i {
    color: var(--primary-color);
}

.nav-link {
    font-weight: 500;
    color: var(--secondary-color);
    padding: 0.5rem 1rem !important;
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

/* Dropdown Customization */
.dropdown-menu {
    border-radius: 15px;
    padding: 10px;
    margin-top: 10px;
    animation: fadeIn 0.3s ease;
}

.dropdown-item {
    border-radius: 8px;
    padding: 8px 15px;
    font-weight: 500;
    color: var(--secondary-color);
    transition: var(--transition);
}

.dropdown-item:hover {
    background-color: rgba(99, 102, 241, 0.05);
    color: var(--primary-color);
    transform: translateX(5px);
}

/* Nested Dropdown (Submenu) */
.dropdown-submenu {
    position: relative;
}

.dropdown-submenu > .dropdown-menu {
    top: 0;
    left: 100%;
    margin-top: -10px;
    margin-left: 0;
}

.dropdown-submenu:hover > .dropdown-menu {
    display: block;
}

.dropdown-toggle::after {
    transition: transform 0.3s ease;
}

.dropdown:hover > .dropdown-toggle::after {
    transform: rotate(180deg);
}

/* Mobile Dropdown Adjustments */
@media (max-width: 991.98px) {
    .dropdown-submenu > .dropdown-menu {
        position: static;
        margin-left: 20px;
        box-shadow: none !important;
        background: rgba(0, 0, 0, 0.02);
        display: none;
    }

    .dropdown-submenu.show > .dropdown-menu {
        display: block;
    }

    .dropdown-menu {
        box-shadow: none !important;
        border: 1px solid #e2e8f0;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.btn-subscribe {
    background: var(--primary-color);
    color: var(--white);
    border-radius: 50px;
    padding: 8px 24px;
    font-weight: 600;
    transition: var(--transition);
    border: none;
}

.btn-subscribe:hover {
    background: var(--primary-hover);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* Footer */
.main-footer {
    background: var(--dark-color);
    color: #94a3b8;
    padding: 80px 0 40px;
}

.footer-title {
    color: var(--white);
    font-weight: 700;
    margin-bottom: 24px;
    font-size: 1.1rem;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: #94a3b8;
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.newsletter-form .form-control {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--white);
    border-radius: 8px;
    padding: 12px 16px;
}

.newsletter-form .form-control:focus {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary-color);
    box-shadow: none;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 30px;
    margin-top: 60px;
    text-align: center;
    font-size: 0.9rem;
}

/* Utilities */
.section-padding {
    padding: 80px 0;
}

.bg-light {
    background-color: var(--light-color) !important;
}