:root {
  --paper: #f4f1ec;
  --ink: #111111;
  --muted: #77716a;
  --rule: rgba(17, 17, 17, 0.14);
}

* {
  box-sizing: border-box;
}

html, body {
  min-height: 100%;
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.tier-chooser {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(1.5rem, 4vh, 3rem);
  padding: clamp(1.5rem, 4vw, 5rem);
  text-align: center;
  overflow: hidden;
}

.tier-chooser__watermark {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  padding: 8vmin;
  opacity: 0.06;
  pointer-events: none;
  user-select: none;
}

.tier-chooser__title,
.tier-chooser__subtitle,
.tier-chooser__options {
  position: relative;
  z-index: 1;
}

.tier-chooser__title {
  margin: 0;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
}

.tier-chooser__subtitle {
  margin: 0;
  color: var(--muted);
  font-size: clamp(1.1rem, 2vw, 1.4rem);
}

.tier-chooser__options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
  width: min(100%, 760px);
}

.tier-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: clamp(1.75rem, 4vw, 2.5rem);
  border: 1px solid var(--rule);
  border-radius: 20px;
  background: #ffffff;
  color: var(--ink);
  text-decoration: none;
  text-align: left;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.tier-card:hover,
.tier-card:focus-visible {
  transform: translateY(-3px);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.08);
}

.tier-card__label {
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.tier-card__hint {
  color: var(--muted);
  font-size: 1rem;
}

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