/* Автоматическая тёмная тема */
@media (prefers-color-scheme: dark) {
    body {
        background-color: #121212;
        color: #e0e0e0;
    }
    .bg-white, .calculator-card, .form-card, .card, .navbar.bg-white {
        background-color: #1e1e1e !important;
        color: #e0e0e0;
    }
    .site-header {
        background-color: #1e1e1e !important;
        border-bottom-color: #333 !important;
    }
    .navbar.bg-white .nav-link, .logo-text {
        color: #e0e0e0 !important;
    }
    .navbar.bg-white .nav-link:hover {
        color: #90caf9 !important;
    }
    .navbar-toggler {
        border-color: rgba(255, 255, 255, 0.3) !important;
    }
    .navbar-toggler-icon {
        background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.8%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") !important;
    }
    .navbar-toggler:focus {
        box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
    }
    .navbar-collapse {
        background-color: #1e1e1e;
        border-radius: 0.5rem;
        margin-top: 0.5rem;
    }
    .navbar-nav .nav-link {
        color: #e0e0e0 !important;
    }
    .navbar-nav .nav-link:hover {
        color: #90caf9 !important;
    }
    .btn-outline-primary {
        color: #90caf9;
        border-color: #90caf9;
    }
    .btn-outline-primary:hover {
        background-color: #90caf9;
        color: #121212;
    }
    .btn-primary {
        background-color: #0d6efd;
        border-color: #0d6efd;
    }
    .bg-light {
        background-color: #1a1a1a !important;
    }
    .text-secondary {
        color: #b0b0b0 !important;
    }
    .border-bottom, .border-top, .border-secondary {
        border-color: #333 !important;
    }
    .card.bg-light {
        background-color: #2c2c2c !important;
    }
    .text-muted {
        color: #9e9e9e !important;
    }
    .form-control, .form-select {
        background-color: #2c2c2c;
        border-color: #444;
        color: #e0e0e0;
    }
    .form-control:focus, .form-select:focus {
        background-color: #2c2c2c;
        color: #e0e0e0;
        border-color: #0d6efd;
    }
    .form-check-label {
        color: #e0e0e0;
    }
    footer.bg-dark {
        background-color: #0a0a0a !important;
    }
    hr.bg-white {
        background-color: #444 !important;
    }
    /* Не трогаем фон hero-блока */
    .hero-section {
        background: linear-gradient(135deg, #0a58ca 0%, #0d6efd 100%) !important;
    }
}