/* === Color Variables === */
:root {
    --primary: #185a9d;           /* Deep blue */
    --primary-light: #43cea2;     /* Lighter blue */
    --background: #f8fafc;
    --background-medium: #e0e7ef;
    --background-light: #f8fafc;    
    --white: #fff;
    --accent: #20bfa9;    
    --footer-bg: #1a1a2e;         /* Dark blue-gray */
    --navbar-shadow: rgba(0,0,0,0.03);
    --feature-shadow: rgba(0,0,0,0.05);
    --feature-hover-shadow: rgba(0,85,150,0.10);
    --about-shadow: rgba(0,0,0,0.07);
    --btn-shadow: rgba(0,85,150,0.13);
}

/* === Main Styles === */
body { font-family: 'Inter', Arial, sans-serif; background: var(--background); }
.navbar { box-shadow: 0 2px 8px var(--navbar-shadow); }
.navbar-brand { font-weight: 600; letter-spacing: 1px; }
.navbar .nav-link.active, .navbar .nav-link:hover { color: var(--primary) !important; }
.hero-bg {
    background: linear-gradient(120deg, var(--primary) 60%, var(--primary-light) 100%);
    color: var(--white);
    min-height: 400px;
    display: flex;
    align-items: center;
}
.hero-title { font-size: 3rem; font-weight: 700; }
.hero-subtitle { font-size: 1.3rem; font-weight: 400; }
.btn-cta { box-shadow: 0 2px 8px var(--btn-shadow); }
.feature-card {
    border: none;
    border-radius: 1rem;
    box-shadow: 0 2px 16px var(--feature-shadow);
    transition: transform 0.2s, box-shadow 0.2s;
    background: var(--white);
}
.feature-card:hover {
    transform: translateY(-6px) scale(1.03);
    box-shadow: 0 8px 32px var(--feature-hover-shadow);
}
.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary);
}
.section-title {
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 2rem;
}
.list-group-item {
    background: transparent;
    border: none;
    font-size: 1.08rem;
    padding-left: 0;
}
.about-img {
    max-width: 100%;
    border-radius: 1rem;
    box-shadow: 0 2px 16px var(--about-shadow);
}
.footer {
    background: var(--footer-bg);
    color: var(--white);
    padding: 2rem 0 1rem 0;
}
#backToTopBtn {
    display: none;
    position: fixed;
    bottom: 40px;
    right: 40px;
    z-index: 99;
}
@media (max-width: 991px) {
    .hero-title { font-size: 2.2rem; }
}