:root {
    --bg:            #F8F9FA;
    --bg-white:      #FFFFFF;
    --text-primary:  #3B568C;
    --text-body:     #2D3748;
    --text-caption:  #6B7280;
    --purple:        #7B2CBF;
    --orange:        #FF6B35;
    --green:         #00A854;
    --blue:          #8B9DC3;
    --neutral:       #E2E8F0;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    scroll-behavior: smooth;
}

body {
    background: var(--bg);
    color: var(--text-body);
    font-family: 'Nunito Sans', sans-serif;
    font-weight: 400;
    line-height: 1.75;
}

/* thin purple rule at top */
.topbar {
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--purple);
    z-index: 3;
}

/* ── LAYOUT ────────────────────────────────────────── */
.page {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 2.5rem;
}

section {
    padding: 4.5rem 0;
    border-bottom: 1px solid var(--neutral);
}

/* ── LINKS ETC ─────────────────────────────────────── */
a {
    color: var(--blue);
    text-decoration: none;
    border-bottom: 1px solid var(--blue);
    transition: color 0.2s, border-color 0.2s;
}

a:hover {
    color: var(--purple);
    border-color: var(--purple);
}


/* ── RESPONSIVE ────────────────────────────────────── */
@media (max-width: 640px) {
    .hero__content { padding: 0 1.5rem 3.5rem; }
    .page { padding: 0 1.5rem; }
    .tier { grid-template-columns: 2.5rem 1fr; gap: 0 1rem; }
    .tier__number { font-size: 1.8rem; }
    .site-footer .page { flex-direction: column; align-items: flex-start; }
}