:root {
  --bg: #0f1720;
  --panel: #ffffff;
  --accent: #ff9900;
  --accent-dark: #e07b00;
  --coin: #f5a623;
  --gem: #4f8ef7;
  --text: #1a1a1a;
  --muted: #6b7280;
  --radius: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: linear-gradient(160deg, #131a2b 0%, #1c2740 40%, #232f21 100%);
  color: var(--text);
  min-height: 100vh;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: rgba(15, 23, 32, 0.9);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 10;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #fff;
  font-weight: 700;
  font-size: 1.2rem;
}
.brand-mark { font-size: 1.5rem; }

.balances { display: flex; gap: 0.6rem; }

.balance-pill {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  color: #1a1a1a;
}
.balance-pill.coin { background: linear-gradient(135deg, #ffd97a, #f5a623); }
.balance-pill.gem { background: linear-gradient(135deg, #a9c8ff, #4f8ef7); color: #fff; }
.balance-pill .label { font-weight: 500; opacity: 0.85; font-size: 0.8rem; }

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hero {
  text-align: center;
  color: #fff;
  padding: 2rem 1rem 1rem;
}
.hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  margin: 0 0 0.6rem;
  letter-spacing: -0.02em;
}
.hero p {
  color: #cbd5e1;
  max-width: 40rem;
  margin: 0 auto 1rem;
  line-height: 1.5;
}
.rate-strip {
  display: inline-flex;
  gap: 0.6rem;
  align-items: center;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 0.5rem 1rem;
  border-radius: 999px;
  color: #ffd97a;
  font-weight: 600;
  font-size: 0.9rem;
  flex-wrap: wrap;
  justify-content: center;
}
.rate-strip .dot { opacity: 0.5; }

.card {
  background: var(--panel);
  border-radius: var(--radius);
  padding: 1.4rem 1.4rem 1.6rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

.grid-two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}
@media (max-width: 680px) {
  .grid-two { grid-template-columns: 1fr; }
}

.card h2 {
  margin: 0 0 0.3rem;
  font-size: 1.15rem;
}
.muted { color: var(--muted); font-size: 0.9rem; margin: 0 0 1rem; }

.btn {
  border: none;
  border-radius: 10px;
  padding: 0.75rem 1.1rem;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.1s ease, opacity 0.15s ease;
  width: 100%;
}
.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
}
.btn-secondary {
  background: #1f2937;
  color: #fff;
}
.btn-ghost {
  background: transparent;
  color: #1f2937;
  border: 1.5px solid #d1d5db;
  margin-top: 0.6rem;
}

.convert-row {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 0.3rem;
}
.convert-row input {
  flex: 1;
  padding: 0.7rem 0.8rem;
  border-radius: 10px;
  border: 1.5px solid #d1d5db;
  font-size: 0.95rem;
}
.convert-row input:focus { outline: 2px solid var(--accent); border-color: transparent; }
.convert-row .btn { width: auto; white-space: nowrap; }

.status-text {
  min-height: 1.2rem;
  font-size: 0.88rem;
  margin: 0.5rem 0 0;
  font-weight: 600;
}
.status-text.success { color: #15803d; }
.status-text.error { color: #dc2626; }

.tiers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.tier-card {
  border: 1.5px solid #eee;
  border-radius: 12px;
  padding: 1rem;
  text-align: center;
  background: #fafafa;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.tier-card .amount {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent-dark);
}
.tier-card .cost {
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 600;
}

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 0.6rem 0.5rem; border-bottom: 1px solid #eee; white-space: nowrap; }
th { color: var(--muted); font-weight: 700; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.03em; }
.empty-row { text-align: center; color: var(--muted); padding: 1.5rem; }

.status-badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  background: #fef3c7;
  color: #92400e;
}

footer {
  text-align: center;
  color: #94a3b8;
  font-size: 0.8rem;
  padding: 1rem 1rem 2rem;
}

.toast {
  position: fixed;
  bottom: 1.2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #111827;
  color: #fff;
  padding: 0.7rem 1.2rem;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  opacity: 0;
  transition: opacity 0.25s ease, transform 0.25s ease;
  pointer-events: none;
  z-index: 50;
  max-width: 90vw;
  text-align: center;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}