:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --dark-color: #0f172a;
    --light-bg: #f8fafc;
}

body {
    font-family: 'Plus Jakarta Sans', sans-serif;
    background-color: var(--light-bg);
    color: var(--dark-color);
    overflow-x: hidden;
}

.navbar {
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.85);
    border-bottom: 1px solid rgba(0,0,0,0.03);
    transition: all 0.4s ease;
}

.navbar-brand {
    letter-spacing: -0.5px;
}

/* Header Navigation Links */
.navbar .nav-link {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--secondary-color);
    position: relative;
    transition: color 0.3s ease;
}

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

.navbar .nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 5px;
    left: 50%;
    background-color: var(--primary-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateX(-50%);
    border-radius: 2px;
}

.navbar .nav-link:hover::after {
    width: 60%;
}

@media (max-width: 991.98px) {
    .navbar .nav-link::after {
        display: none;
    }
    .navbar .btn {
        margin-top: 15px;
        width: 100%;
    }
}

.hero-section {
    padding: 120px 0 80px;
    background: radial-gradient(circle at top right, rgba(37, 99, 235, 0.05), transparent),
                radial-gradient(circle at bottom left, rgba(37, 99, 235, 0.05), transparent);
}

.btn-primary {
    background-color: var(--primary-color);
    border: none;
    padding: 12px 28px;
    border-radius: 10px;
    font-weight: 600;
    transition: transform 0.2s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    background-color: #1d4ed8;
}

.card {
    border: none;
    border-radius: 16px;
    transition: all 0.3s;
    overflow: hidden;
}

.card-portfolio:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.badge-category {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
    border-radius: 6px;
    padding: 5px 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Skeleton Loading Animation */
.placeholder-glow .placeholder {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}
@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Tier 1 Loading */
#fullPageLoader {
    position: fixed;
    inset: 0;
    background: rgba(255,255,255,0.9);
    z-index: 9999;
    display: none;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    backdrop-filter: blur(4px);
}

.sidebar {
    height: 100vh;
    background: white;
    border-right: 1px solid #eee;
    position: sticky;
    top: 0;
}

.nav-link-admin {
    padding: 12px 20px;
    border-radius: 8px;
    color: var(--secondary-color);
    margin-bottom: 5px;
    transition: all 0.2s;
    text-decoration: none;
    display: block;
}

.nav-link-admin.active {
    background: var(--primary-color);
    color: white;
}

.footer-brand {
    font-size: 0.8rem;
    color: #94a3b8;
}