body {
            margin: 0;
            min-height: 100vh;
            height: auto;
            overflow: auto;
            background: #f5f7fb;
            color: #17345f;
            font-family: system-ui, sans-serif
        }

        header,
        footer {
            background: #fff;
            border-bottom: 1px solid #dce3ee
        }

        .nav,
        .wrap,
        .foot {
            width: min(1180px, calc(100% - 40px));
            margin: auto
        }

        .nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 18px 0
        }

        .nav a {
            text-decoration: none;
            color: #17345f;
            margin-left: 18px
        }

        .wrap {
            padding: 40px 0 70px
        }

        .hero {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 32px
        }

        .card,
        .lesson {
            background: #fff;
            border: 1px solid #dce3ee;
            border-radius: 20px;
            padding: 22px;
            box-shadow: 0 8px 24px rgba(0, 0, 0, .06)
        }

        .logo {
            max-width: 220px
        }

        .logo {
    display: block;
    width: min(320px, 80%);
    height: auto;
    margin-bottom: 1.5rem;
}

        h1 {
            font-size: 48px
        }

        .badge {
            display: inline-block;
            padding: 10px 14px;
            border-radius: 999px;
            background: #eef3fa;
            border: 1px solid #dce3ee
        }

        .price {
            font-size: 42px;
            font-weight: 800
        }

        .btn {
            display: block;
            text-align: center;
            padding: 14px;
            border-radius: 12px;
            text-decoration: none;
            font-weight: 700;
            margin-top: 12px
        }

        .primary {
            background: #2a6df4;
            color: #fff
        }

        .secondary {
            background: #eef3fa;
            color: #17345f
        }

        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 20px
        }

        .embed {
            aspect-ratio: 16/9;
            background: #e8edf6;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center
        }

        @media(max-width:800px) {
            .hero {
                grid-template-columns: 1fr
            }

            h1 {
                font-size: 38px
            }
        }




        .site-header {
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(14px);
}

.nav-shell {
    width: min(1180px, calc(100% - 40px));
    min-height: 76px;
    margin: 0 auto;

    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    text-decoration: none;

    font-size: 22px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
}

.brand-mark {
    width: 40px;
    height: 48px;
    flex: 0 0 auto;
    filter: drop-shadow(0 5px 10px rgba(35, 67, 106, 0.12));
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 22px;
    font-size: 14px;
}

.nav-links a {
    text-decoration: none;
    color: var(--muted);
}

.nav-links a:hover {
    color: var(--accent-dark);
}

@media (max-width: 760px) {

    .nav-shell {
        width: min(100% - 28px, 1180px);
    }

    .nav-links {
        display: none;
    }

}