:root {
  /* ── Surface ── */
  --bg:          #f4f4f6;
  --surface:     #ffffff;
  --soft:        #f8f8fa;
  --border:      #e8e8ec;
  --border-soft: #f3f4f6;

  /* ── Ink ── */
  --text:    #1a1a1a;
  --text-2:  #1f2937;
  --text-3:  #4b5563;
  --muted:   #9ca3af;
  --muted-2: #d1d5db;

  /* ── Tier accents ── */
  --gold:     #d97706;
  --gold-bg:  #fef3c7;
  --gold-bdr: #fde68a;

  --plat:     #475569;
  --plat-bg:  #f1f5f9;
  --plat-bdr: #cbd5e1;

  --dia:      #1d4ed8;
  --dia-bg:   #eff6ff;
  --dia-bdr:  #bfdbfe;
  --dia-cyan: #06b6d4;

  /* ── State ── */
  --success: #059669;
  --danger:  #dc2626;
  --accent:  var(--dia);

  /* ── Elevation ── */
  --shadow:   0 2px 16px rgba(0,0,0,.07), 0 1px 4px rgba(0,0,0,.04);
  --shadow-h: 0 8px 40px rgba(0,0,0,.10), 0 2px 8px rgba(0,0,0,.06);

  /* ── Radius ── */
  --r-sm:  8px;
  --r-md:  10px;
  --r-lg:  12px;
  --r-xl:  16px;
  --r-2xl: 20px;

  /* ── Motion ── */
  --ease:   cubic-bezier(.22,.68,0,1.2);
  --t-fast: .15s ease;
  --t-med:  .28s var(--ease);
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { display: block; max-width: 100%; }
button { font-family: inherit; }
a { color: inherit; }

/* ── Motion primitive ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeUp .5s ease forwards; }

/* ── Shared primitives ── */
.billing-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.billing-brand {
  text-align: center;
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.3px;
  color: var(--text);
}

.muted  { color: var(--muted); }
.danger { color: var(--danger); }