:root {
    --ct-primary: #2266ff;
    --ct-accent: #ffb703;
    --ct-muted: #6c757d;
}

body {
    font-family: "Inter", "Segoe UI", sans-serif;
    color: #212529;
    background: linear-gradient(180deg, #f7f9fc 0%, #ffffff 35%);
}

.top-bar {
    letter-spacing: 0.05em;
}

.hero-section {
    padding-bottom: 6rem;
    background-image: radial-gradient(circle at top, rgba(34, 102, 255, 0.08), transparent 55%);
}

.py-6 {
    padding-top: 4.5rem !important;
    padding-bottom: 4.5rem !important;
}

@media (min-width: 768px) {
    .py-md-6 {
        padding-top: 5.5rem !important;
        padding-bottom: 5.5rem !important;
    }
}

.hero-section .badge {
    letter-spacing: 0.12em;
}

.hero-section .display-5 {
    max-width: 60rem;
    margin: 0 auto;
}

.hero-section .lead {
    max-width: 42rem;
    margin: 0 auto;
}

.input-group-lg .form-control,
.input-group-lg .input-group-text {
    border-color: rgba(34, 102, 255, 0.2);
}

.input-group-lg .form-control:focus {
    border-color: var(--ct-primary);
    box-shadow: 0 0 0 0.25rem rgba(34, 102, 255, 0.15);
}

.navbar-brand {
    letter-spacing: 0.03em;
}

.navbar .nav-link {
    color: var(--ct-muted);
}

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

.card {
    border-radius: 1rem;
}

.card .card-title {
    letter-spacing: 0.08em;
}

.card .card-text {
    line-height: 1.6;
}

#topics-grid .card {
    border-top: 0.35rem solid rgba(34, 102, 255, 0.18);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

#topics-grid .card:hover {
    transform: translateY(-4px);
    box-shadow: 0 0.75rem 1.5rem rgba(34, 102, 255, 0.12);
}

.pagination .page-link {
    color: var(--ct-primary);
    border-radius: 0.75rem;
    margin: 0 0.25rem;
}

.pagination .page-item.active .page-link {
    background-color: var(--ct-primary);
    border-color: var(--ct-primary);
}

.text-warning {
    letter-spacing: 0.2em;
}

#feedback .card {
    background-color: #ffffff;
}

#about p,
#about li {
    max-width: 32rem;
}

.bg-body-secondary {
    background-color: #f2f5f9 !important;
}

.w-lg-50 {
    width: 100%;
}

@media (min-width: 992px) {
    .w-lg-50 {
        width: 50%;
    }
}

footer {
    background-color: #ffffff;
}