:root {
  --bg: #f5f6f9;
  --panel: #ffffff;
  --border: #e7e9f0;
  --text: #1f2530;
  --muted: #6b7482;
  --faint: #99a1af;
  --grad-a: #5b7cfa;
  --grad-b: #7d6bf0;
  --accent: #5b7cfa;
  --accent-ink: #3a49c9;
  --teal: #1d9e88;
  --teal-2: #3bbfa9;
  --amber: #e0a23b;
  --radius: 18px;
  --shadow: 0 6px 24px rgba(28, 37, 61, .08);
  --shadow-sm: 0 2px 8px rgba(28, 37, 61, .06);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-ink); text-decoration: none; }

.wrap { max-width: 960px; margin: 0 auto; padding: 0 18px; }

/* header */
header {
  padding: 22px 0 8px;
}
.brand { display: flex; align-items: center; gap: 11px; }
.brand .logo {
  width: 38px; height: 38px; border-radius: 11px;
  background: linear-gradient(140deg, var(--grad-a), var(--grad-b));
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 12px rgba(91, 124, 250, .35); flex: none;
}
.brand .logo::after { content: ''; width: 13px; height: 13px; border-radius: 50%; background: #fff; }
.brand .name { font-weight: 800; font-size: 18px; letter-spacing: -.3px; }
.brand .name span { color: var(--accent); }

/* hero */
.hero { text-align: center; padding: 26px 0 8px; }
.hero h1 { font-size: 28px; font-weight: 800; letter-spacing: -.6px; line-height: 1.2; }
.hero p { color: var(--muted); font-size: 15px; margin-top: 10px; max-width: 520px; margin-left: auto; margin-right: auto; }
.pill {
  display: inline-block; background: #eef1ff; color: var(--accent-ink);
  font-size: 12px; font-weight: 700; padding: 5px 12px; border-radius: 999px; margin-bottom: 14px;
}

/* plans */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 26px 0 10px; }
.plan {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px 20px; box-shadow: var(--shadow-sm); display: flex; flex-direction: column;
  position: relative;
}
.plan.pop { border: 2px solid var(--accent); box-shadow: var(--shadow); }
.plan .tag {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(140deg, var(--grad-a), var(--grad-b)); color: #fff;
  font-size: 11px; font-weight: 700; padding: 4px 12px; border-radius: 999px; letter-spacing: .3px;
}
.plan h3 { font-size: 17px; font-weight: 800; }
.plan .price { margin: 12px 0 4px; }
.plan .price b { font-size: 30px; font-weight: 800; letter-spacing: -1px; }
.plan .price .cur { font-size: 14px; color: var(--muted); font-weight: 700; }
.plan .price .per { font-size: 13px; color: var(--faint); }
.plan ul { list-style: none; margin: 16px 0 20px; display: grid; gap: 9px; }
.plan li { font-size: 13.5px; color: var(--text); display: flex; gap: 9px; align-items: flex-start; }
.plan li svg { flex: none; margin-top: 2px; }
.plan .btn { margin-top: auto; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  width: 100%; padding: 12px 16px; border-radius: 12px; border: none; cursor: pointer;
  font-family: inherit; font-size: 15px; font-weight: 700; text-align: center;
  background: linear-gradient(140deg, var(--grad-a), var(--grad-b)); color: #fff;
  box-shadow: 0 4px 14px rgba(91, 124, 250, .32); transition: transform .06s, filter .12s;
}
.btn:hover { filter: brightness(1.05); }
.btn:active { transform: translateY(1px); }
.btn.ghost { background: var(--panel); color: var(--text); border: 1.5px solid var(--border); box-shadow: none; }
.btn.teal { background: linear-gradient(140deg, var(--teal), var(--teal-2)); box-shadow: 0 4px 14px rgba(29,158,136,.28); }
.btn:disabled { opacity: .55; cursor: not-allowed; }

/* prepaid callout */
.callout {
  margin: 22px 0; background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow-sm);
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
}
.callout .txt { flex: 1; min-width: 200px; }
.callout .txt b { font-size: 15px; }
.callout .txt p { color: var(--muted); font-size: 13.5px; margin-top: 2px; }
.callout .btn { width: auto; padding: 11px 20px; }

/* card / form (prepaid page) */
.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 26px 22px; max-width: 440px; margin: 26px auto;
}
.field { display: grid; gap: 6px; margin-bottom: 16px; }
.field label { font-size: 13px; font-weight: 700; color: var(--text); }
.field input {
  font-family: inherit; font-size: 16px; padding: 13px 14px; border: 1.5px solid var(--border);
  border-radius: 12px; outline: none; color: var(--text); background: #fbfcfe; width: 100%;
}
.field input:focus { border-color: var(--accent); box-shadow: 0 0 0 4px #eef1ff; }
.field .hint { font-size: 12px; color: var(--faint); }
.result { border-radius: 12px; padding: 14px 16px; font-size: 14px; margin-bottom: 16px; font-weight: 600; }
.result.ok { background: #e9f7f3; color: #157a68; border: 1px solid #b8e6da; }
.result.err { background: #fdeeeb; color: #c9503d; border: 1px solid #f3c9c0; }
.code-input { text-transform: uppercase; letter-spacing: 3px; font-family: ui-monospace, monospace; }

/* footer */
footer { text-align: center; color: var(--faint); font-size: 12.5px; padding: 34px 0 40px; }
footer a { color: var(--muted); }
.back { display: inline-block; margin: 8px 0 0; color: var(--muted); font-size: 14px; font-weight: 600; }

/* mobile */
@media (max-width: 720px) {
  .plans { grid-template-columns: 1fr; gap: 14px; }
  .plan.pop { order: -1; }
  .hero h1 { font-size: 24px; }
}