:root {
    --primary: #2563eb;
    --dark: #0f172a;
    --bg: #0b1220;
    --card: #ffffff;
    --danger: #dc2626;
    --text: #0f172a;
}

* {
    box-sizing: border-box;
    font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}

body {
    margin: 0;
    background: linear-gradient(180deg, #0b1220 0%, #0f172a 100%);
    color: #fff;
}

/* HEADER */
.topbar {
    height: 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 40px;
}

.topbar a {
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    margin-left: 20px;
}

/* CONTENT */
.page {
    max-width: 720px;
    margin: 80px auto 0;
}

/* CARDS */
.card {
    background: #ffffff;
    color: var(--text);
    border-radius: 14px;
    padding: 28px;
    margin-bottom: 28px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.35);
}

/* BUTTONS */
.btn {
    display: inline-block;
    padding: 12px 20px;
    border-radius: 10px;
    font-weight: 600;
    background: var(--primary);
    color: #fff;
    text-decoration: none;
}

.btn.secondary {
    background: #64748b;
}

.btn.red {
    background: var(--danger);
}

.btn + .btn {
    margin-top: 12px;
}

/* SMALL TEXT */
small {
    color: #94a3b8;
}
/* ==========================
   MOBIEL (max 768px)
========================== */

@media (max-width: 768px) {

    /* algemene spacing */
    .page {
        margin: 30px 15px 0;
        max-width: 100%;
    }

    .card {
        padding: 20px;
        border-radius: 12px;
    }

    /* header */
    .topbar {
        padding: 0 20px;
        height: 56px;
    }

    .topbar strong {
        font-size: 16px;
    }

    .topbar a {
        margin-left: 12px;
        font-size: 14px;
    }

    /* knoppen */
    .btn {
        width: 100%;
        text-align: center;
        padding: 14px;
        font-size: 16px;
    }

    .btn + .btn {
        margin-top: 10px;
    }

    /* tekst */
    h1 {
        font-size: 24px;
    }

    h2 {
        font-size: 20px;
    }

    h3 {
        font-size: 17px;
    }

    p {
        font-size: 15px;
        line-height: 1.6;
    }

}