:root {
  --sub-bg: #0b0f17;
  --sub-surface: rgba(255, 255, 255, 0.06);
  --sub-border: rgba(255, 255, 255, 0.12);
  --sub-text: #eaf2ff;
  --sub-muted: #a9b3c7;
  --sub-primary: #6ea8ff;
  --sub-primary2: #4d86ff;
  --sub-radius: 18px;
  --sub-glass: saturate(180%) blur(8px);
  --sub-shadow: 0 12px 34px rgba(0, 0, 0, 0.35);
}

.sub-header {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
  border-bottom: 1px solid var(--sub-border);
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: var(--sub-glass);
  -webkit-backdrop-filter: var(--sub-glass);
}

.sub-header__inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--sub-text);
  text-decoration: none;
}

.brand__logo {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.brand__text {
  font-weight: 600;
  letter-spacing: .4px;
}

.sub-nav a {
  color: var(--sub-muted);
  text-decoration: none;
  padding: 8px 10px;
  border-radius: 10px;
}

.sub-nav a:hover {
  color: var(--sub-text);
  background: rgba(255, 255, 255, 0.07);
}

.sub-container {
  min-height: 100dvh;
  background: radial-gradient(1400px 900px at 70% -10%, #1a2240 0%, var(--sub-bg) 55%) fixed;
  padding: clamp(16px, 4vw, 40px);
  display: grid;
  place-items: center;
}

.sub-card {
  width: min(1100px, 98vw);
  background: var(--sub-surface);
  border: 1px solid var(--sub-border);
  border-radius: var(--sub-radius);
  box-shadow: var(--sub-shadow);
  padding: clamp(18px, 3.6vw, 28px);
  backdrop-filter: var(--sub-glass);
  -webkit-backdrop-filter: var(--sub-glass);
}

.sub-title {
  margin: 0 0 10px;
  font-size: clamp(22px, 4.4vw, 30px);
}

.sub-title--sm {
  font-size: clamp(18px, 3.6vw, 22px);
}

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

.payment-methods {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  margin: 16px 0;
}

.payment-btn {
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--sub-text);
  cursor: pointer;
}

.payment-btn[aria-pressed="true"],
.payment-btn.selected {
  background: linear-gradient(180deg, var(--sub-primary) 0%, var(--sub-primary2) 100%);
  color: #031129;
  border-color: transparent;
  font-weight: 600;
}

.subscription-form {
  text-align: center;
  margin-top: 10px;
}

.subscription-form select {
  min-width: min(400px, 90vw);
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: var(--sub-text);
}

.sub-actions {
  display: grid;
  place-items: center;
  margin: 14px 0;
}

.switch-btn {
  padding: 12px 14px;
  border-radius: 12px;
  cursor: pointer;
  background: linear-gradient(180deg, var(--sub-primary) 0%, var(--sub-primary2) 100%);
  border: none;
  color: #031129;
  font-weight: 600;
}

.switch-btn.outline {
  background: rgba(255, 255, 255, 0.06);
  color: var(--sub-text);
  border: 1px solid rgba(255, 255, 255, 0.24);
}

.sub-panel {
  margin-top: 14px;
}

.pay-box {
  margin-top: 8px;
}

.pay-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 14px;
}

.qr {
  width: 220px;
  height: auto;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.pay-info p {
  margin: 4px 0;
}

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
}

.form-row {
  display: grid;
  gap: 6px;
  margin: 10px 0;
}

.input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: var(--sub-text);
}

.tb-btn {
  --bg: rgba(255, 255, 255, 0.08);
  --bd: rgba(255, 255, 255, 0.2);
  --fg: var(--sub-text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 14px;
  border-radius: 12px;
  border: 1px solid var(--bd);
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
}

.tb-btn.primary {
  background: linear-gradient(180deg, var(--sub-primary) 0%, var(--sub-primary2) 100%);
  border-color: transparent;
  color: #031129;
  font-weight: 600;
}

.tb-btn.outline {
  background: rgba(255, 255, 255, 0.06);
  color: var(--sub-text);
  border: 1px solid rgba(255, 255, 255, 0.24);
}

.tb-btn.small {
  padding: 8px 10px;
  border-radius: 10px;
  font-size: .9rem;
}

.status-box {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.06);
}

.status-line {
  margin: 0;
}

.help-box {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.sub-footer {
  text-align: center;
  color: var(--sub-muted);
  padding: 16px;
}

@media (max-width: 820px) {
  .pay-grid {
    grid-template-columns: 1fr;
  }
}