:root {
        --bg-light: #e9edf7;
        --bg-dark: #0a0d17;
        --text-light: #0a0a0a;
        --text-dark: #e9e9e9;
        --accent: #3e66c9;
    }

    body {
        margin: 0;
        padding: 40px 24px;
        font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
        background-color: var(--bg-light);
        color: var(--text-light);
        transition: background-color 0.3s, color 0.3s;
    }

    @media (prefers-color-scheme: dark) {
        body {
            background-color: var(--bg-dark);
            color: var(--text-dark);
        }
    }

    h1 {
        font-size: clamp(28px, 4vw, 36px);
        margin-bottom: 24px;
        font-weight: 600;
        text-align: center;
    }

    p {
        line-height: 1.6;
        margin: 0 0 24px;
        text-align: center;
    }

    a {
        color: var(--text-light);
        text-decoration: none;
    }

    @media (prefers-color-scheme: dark) {
        a {
            color: var(--text-dark);
        }
    }

    .img-logo {
        width: 128px !important;
    }

    #lang-select {
        text-align: center;
        margin: 30px 0 12px;
        font-size: 14px;
    }

    #lang-select a {
        color: inherit;
        text-decoration: none;
        font-weight: 600;
    }

    #lang-select a:hover {
        color: inherit;
        text-decoration: none;
    }

    #lang-select b {
        font-weight: 700;
        text-decoration: underline;
    }

    .button-group {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 16px;
        margin-top: 40px;
    }

    .btn {
        display: block;
        width: 240px;
        text-align: center;
        padding: 14px 28px;
        background-color: var(--accent);
        color: var(--text-dark);
        font-weight: 600;
        text-decoration: none;
        border: none;
        border-radius: 0;
        transition: background-color 0.25s;
    }

    .btn:hover,
    .btn:focus {
        background-color: #2f4ea1;
    }

    .button-group img {
        width: 38%;
        max-width: 256px;
        height: auto;
        margin-bottom: 16px;
    }

    .h10 {
        height: 10px
    }

    .h20 {
        height: 20px
    }

    .h40 {
        height: 40px
    }

    footer {
        margin-top: 30px;
        text-align: center;
        font-size: 14px;
        color: var(--text-light);
    }

    @media (prefers-color-scheme: dark) {
        footer {
            color: var(--text-dark);
        }
    }