:root {
  --bg: #0b1020;
  --card: #141a2e;
  --border: #263052;
  --text: #e8ecf6;
  --muted: #9aa5c4;
  --accent: #f5b942;
  --accent-2: #4dd0a6;
  --danger: #ff7a7a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
}
.site-header .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}
.logo { font-weight: 700; font-size: 18px; }
.site-header nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 16px;
  font-size: 14px;
}
.site-header nav a:hover { color: var(--text); }

.hero { padding: 40px 0 20px; }
h1 { font-size: 32px; margin: 0 0 12px; line-height: 1.25; }
.lede { color: var(--muted); font-size: 17px; }
.disclaimer {
  font-size: 13px;
  color: var(--muted);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin: 20px 0;
}
.card h2 { margin-top: 0; font-size: 20px; }

.quota-bar {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 16px;
}
.quota-bar strong { color: var(--accent-2); }

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 18px 0 12px;
}
.plan {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  background: #0d1326;
}
.plan-featured {
  border-color: var(--accent-2);
  box-shadow: inset 0 0 0 1px rgba(77, 208, 166, 0.2);
}
.plan h3 { margin: 0 0 8px; font-size: 17px; }
.plan p { color: var(--muted); margin: 0 0 10px; }
.plan ul { margin: 0; padding-left: 20px; color: var(--muted); font-size: 14px; }
.plan-price {
  font-size: 34px;
  font-weight: 800;
  line-height: 1.1;
  margin: 4px 0 10px;
  color: var(--accent);
}
.plan-price span { font-size: 14px; color: var(--muted); font-weight: 400; }
.plan-badge {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(77, 208, 166, 0.12);
  color: var(--accent-2);
  font-size: 12px;
  font-weight: 700;
}

@media (max-width: 560px) {
  .pricing-grid { grid-template-columns: 1fr; }
}

label { display: block; font-size: 14px; margin-bottom: 6px; color: var(--muted); }
.rate-label { margin-top: 14px; }
.hint { color: var(--muted); font-size: 13px; }

.input-row { display: flex; gap: 10px; flex-wrap: wrap; }

input[type="number"], input[type="email"], select {
  background: #0d1326;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 16px;
  flex: 1;
  min-width: 0;
}
input[type="number"]#rate-denom {
  width: 110px;
  flex: none;
  padding: 4px 8px;
  font-size: 14px;
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

button {
  background: var(--accent);
  color: #1a1206;
  border: none;
  border-radius: 8px;
  padding: 12px 22px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
}
button:hover { filter: brightness(1.08); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.link-btn {
  background: none;
  color: var(--muted);
  font-weight: 400;
  font-size: 14px;
  padding: 8px;
  text-decoration: underline;
}

.results { margin-top: 24px; }
.hidden { display: none !important; }

.result-main { text-align: center; padding: 16px 0 20px; }
.big-number {
  font-size: 48px;
  font-weight: 800;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.big-label { color: var(--muted); font-size: 14px; }

.result-table { width: 100%; border-collapse: collapse; font-size: 15px; }
.result-table td {
  padding: 10px 4px;
  border-top: 1px solid var(--border);
}
.result-table td:last-child {
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--accent-2);
}

.reverse { margin-top: 28px; border-top: 1px solid var(--border); padding-top: 20px; }
.reverse h2 { font-size: 17px; }
.reverse-result {
  margin-top: 14px;
  font-size: 16px;
  color: var(--accent-2);
  font-weight: 600;
}

#explainer ul { padding-left: 20px; color: var(--muted); }
#explainer p { color: var(--muted); }
code {
  background: #0d1326;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 14px;
  color: var(--accent-2);
}

#faq details {
  border-top: 1px solid var(--border);
  padding: 12px 0;
}
#faq summary { cursor: pointer; font-weight: 600; }
#faq details p { color: var(--muted); margin-bottom: 4px; }

.site-footer {
  padding: 30px 0 40px;
  font-size: 13px;
  color: var(--muted);
}
.site-footer a { color: var(--muted); }

/* 弹窗 */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(4, 7, 16, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 100;
}
.modal-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  max-width: 420px;
  width: 100%;
  text-align: center;
}
.modal-box h2 { margin-top: 0; font-size: 22px; }
.price {
  font-size: 44px;
  font-weight: 800;
  color: var(--accent);
  margin: 12px 0;
}
.price span { font-size: 15px; color: var(--muted); font-weight: 400; }
.perks {
  text-align: left;
  color: var(--muted);
  font-size: 14px;
  padding-left: 20px;
  margin: 0 0 18px;
}
#checkout-form { display: flex; flex-direction: column; gap: 10px; }
.fine-print { font-size: 12px; color: var(--muted); margin-top: 14px; }
.fine-print a { color: var(--muted); }

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-2);
  color: #06251b;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  z-index: 200;
  max-width: 90vw;
}
.toast.error { background: var(--danger); color: #2b0808; }

/* TOS / Privacy 页面 */
.legal h1 { font-size: 28px; }
.legal h2 { font-size: 20px; margin-top: 28px; }
.legal p, .legal li { color: var(--muted); font-size: 15px; }
.legal a { color: var(--accent-2); }
.legal .updated { font-size: 13px; color: var(--muted); }

@media (max-width: 520px) {
  h1 { font-size: 26px; }
  .big-number { font-size: 38px; }
  .card { padding: 18px; }
}