* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  color: #f5f7ff;
  background:
    radial-gradient(circle at top, rgba(0, 210, 255, 0.16), transparent 34%),
    linear-gradient(135deg, #050815, #090b14 48%, #000);
}

.page-shell {
  width: min(1180px, 94vw);
  margin: 0 auto;
  padding: 48px 0 72px;
}

.hero {
  text-align: center;
  margin-bottom: 34px;
}

.eyebrow {
  letter-spacing: 0.18em;
  font-size: 0.78rem;
  opacity: 0.78;
}

.hero h1 {
  margin: 10px 0 12px;
  font-size: clamp(2rem, 4vw, 4rem);
}

.hero p {
  max-width: 760px;
  margin: 0 auto;
  opacity: 0.84;
  line-height: 1.6;
}

.tier-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.tier-card {
  position: relative;
  padding: 24px;
  border-radius: 22px;
  min-height: 460px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.055);
  box-shadow: 0 22px 60px rgba(0,0,0,0.34);
  overflow: hidden;
}

.tier-card::before {
  content: "";
  position: absolute;
  inset: -40%;
  opacity: 0.22;
  pointer-events: none;
}

.bronze::before {
  background: radial-gradient(circle, #c47a3a, transparent 58%);
}

.silver::before {
  background: radial-gradient(circle, #d9e4f2, transparent 58%);
}

.gold::before {
  background: radial-gradient(circle, #ffd35a, transparent 58%);
}

.platinum::before {
  background: radial-gradient(circle, #e8f7ff, transparent 58%);
}

.tier-card > * {
  position: relative;
  z-index: 1;
}

.tier-badge {
  display: inline-block;
  padding: 8px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  border: 1px solid rgba(255,255,255,0.18);
  background: rgba(0,0,0,0.28);
}

.tier-card h2 {
  margin: 22px 0 12px;
  font-size: 1.5rem;
}

.tier-purpose {
  min-height: 86px;
  opacity: 0.86;
  line-height: 1.5;
}

.node-strip {
  display: grid;
  gap: 8px;
  margin: 18px 0;
}

.node-strip span {
  padding: 9px 10px;
  border-radius: 12px;
  background: rgba(0,0,0,0.24);
  border: 1px solid rgba(255,255,255,0.12);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

ul {
  padding-left: 18px;
  line-height: 1.7;
  opacity: 0.9;
}

.decision {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid rgba(255,255,255,0.14);
  font-size: 0.86rem;
  opacity: 0.82;
}

.core-rule {
  margin-top: 28px;
  padding: 28px;
  border-radius: 22px;
  text-align: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(0,220,255,0.26);
  box-shadow: 0 0 32px rgba(0,220,255,0.10);
}

.core-rule p {
  max-width: 850px;
  margin: 10px auto;
  line-height: 1.6;
  opacity: 0.88;
}

@media (max-width: 1050px) {
  .tier-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .tier-grid {
    grid-template-columns: 1fr;
  }

  .tier-card {
    min-height: auto;
  }
}

/* AVANZA visual refinement v0.2 */
.gold {
  border-color: rgba(255, 211, 90, 0.42);
  box-shadow:
    0 22px 70px rgba(0,0,0,0.38),
    0 0 36px rgba(255, 211, 90, 0.16);
}

.gold::before {
  opacity: 0.34;
  background:
    radial-gradient(circle at 30% 12%, rgba(255, 219, 100, 0.95), transparent 34%),
    radial-gradient(circle at 85% 90%, rgba(255, 145, 30, 0.55), transparent 42%);
}

.platinum {
  border-color: rgba(232, 247, 255, 0.52);
  box-shadow:
    0 22px 80px rgba(0,0,0,0.42),
    0 0 42px rgba(190, 235, 255, 0.20);
}

.platinum::before {
  opacity: 0.38;
  background:
    radial-gradient(circle at 28% 10%, rgba(232, 247, 255, 0.95), transparent 32%),
    radial-gradient(circle at 88% 88%, rgba(0, 210, 255, 0.45), transparent 42%);
}

.node-strip span {
  color: #8eeeff;
  border-color: rgba(0, 220, 255, 0.30);
  background:
    linear-gradient(135deg, rgba(0, 220, 255, 0.12), rgba(255,255,255,0.04));
  box-shadow: 0 0 16px rgba(0, 220, 255, 0.10);
  font-weight: 700;
}

.tier-badge {
  box-shadow: 0 0 18px rgba(255,255,255,0.08);
}

.gold .tier-badge {
  color: #ffe38a;
  border-color: rgba(255, 211, 90, 0.46);
}

.platinum .tier-badge {
  color: #e8f7ff;
  border-color: rgba(232, 247, 255, 0.58);
}


/* Access Levels navigation */
.tier-navigation {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
  margin: 36px auto 10px;
  text-align: center;
}

.tier-navigation a {
  display: inline-block;
  padding: 13px 19px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.tier-navigation .nav-primary {
  background: linear-gradient(135deg, rgba(0,220,255,0.95), rgba(120,245,255,0.74));
  color: #001018;
}

.tier-navigation .nav-secondary {
  background: rgba(255,255,255,0.08);
  color: #f5f7ff;
  border: 1px solid rgba(255,255,255,0.18);
}