:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #14182b;
  --muted: #5d6478;
  --border: #dfe3ee;
  --accent: #00baf2;      /* Paytm blue */
  --accent-dark: #002e6e; /* Paytm navy */
  --success: #138a4a;
  --danger: #c62828;
  --warning: #b26a00;
  --radius: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1220;
    --card: #171c2e;
    --text: #e8ebf5;
    --muted: #9aa2b8;
    --border: #2a3149;
    --accent-dark: #7fd8ff;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.site-header {
  padding: 18px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--card);
}
.site-header .inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.brand { font-weight: 700; font-size: 1.15rem; color: var(--accent-dark); text-decoration: none; }
.secure { font-size: .85rem; color: var(--muted); display: flex; align-items: center; gap: 6px; }

main {
  max-width: 960px;
  margin: 32px auto;
  padding: 0 16px;
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 24px;
  align-items: start;
}
main.single { grid-template-columns: minmax(0, 520px); justify-content: center; }

@media (max-width: 760px) {
  main { grid-template-columns: 1fr; margin: 20px auto; }
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

h1 { font-size: 1.5rem; margin: 0 0 4px; }
h2 { font-size: 1.05rem; margin: 0 0 16px; }
.sub { color: var(--muted); margin: 0 0 24px; }

.field { margin-bottom: 16px; }
label { display: block; font-size: .9rem; font-weight: 600; margin-bottom: 6px; }
input {
  width: 100%;
  padding: 12px 14px;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(0, 186, 242, .2); }

.amount-wrap { position: relative; }
.amount-wrap span { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--muted); font-weight: 600; }
.amount-wrap input { padding-left: 30px; font-size: 1.25rem; font-weight: 600; }

.quick { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.quick button {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  border-radius: 999px;
  padding: 6px 14px;
  font: inherit;
  font-size: .9rem;
  cursor: pointer;
}
.quick button:hover { border-color: var(--accent); }

.row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 480px) { .row { grid-template-columns: 1fr; } }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 14px 18px;
  font: inherit;
  font-weight: 700;
  font-size: 1rem;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  text-decoration: none;
  transition: filter .15s;
}
.btn:hover { filter: brightness(1.05); }
.btn:disabled { opacity: .6; cursor: progress; }
.btn.secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn.danger { background: var(--danger); }

.error {
  display: none;
  margin-bottom: 16px;
  padding: 10px 14px;
  border-radius: 10px;
  background: rgba(198, 40, 40, .1);
  color: var(--danger);
  font-size: .92rem;
}
.error.show { display: block; }

.banner {
  max-width: 960px;
  margin: 16px auto 0;
  padding: 10px 16px;
  border-radius: 10px;
  background: rgba(178, 106, 0, .12);
  color: var(--warning);
  font-size: .9rem;
}
.banner-wrap { padding: 0 16px; }

.summary dl { margin: 0; }
.summary .line { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px dashed var(--border); }
.summary .line:last-child { border-bottom: none; }
.summary dt { color: var(--muted); }
.summary dd { margin: 0; font-weight: 600; }
.summary .total dd { font-size: 1.25rem; color: var(--accent-dark); }

.methods { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.methods span { font-size: .8rem; padding: 4px 10px; border-radius: 6px; background: var(--bg); border: 1px solid var(--border); color: var(--muted); }

.note { font-size: .82rem; color: var(--muted); margin-top: 14px; text-align: center; }

.status-icon {
  width: 64px; height: 64px; border-radius: 50%;
  display: grid; place-items: center;
  margin: 0 auto 16px; font-size: 2rem; color: #fff;
}
.status-icon.SUCCESS { background: var(--success); }
.status-icon.FAILED, .status-icon.INIT_FAILED, .status-icon.AMOUNT_MISMATCH { background: var(--danger); }
.status-icon.PENDING, .status-icon.CREATED { background: var(--warning); }
.center { text-align: center; }
.actions { display: grid; gap: 10px; margin-top: 24px; }

.spinner {
  width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid rgba(255,255,255,.5); border-top-color: #fff;
  animation: spin .7s linear infinite; display: none;
}
.btn.loading .spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

footer { text-align: center; color: var(--muted); font-size: .8rem; padding: 24px 16px 40px; }

/* Subscription plans */
.plans { display: grid; gap: 10px; }
.plan {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 12px;
  padding: 14px 16px; border: 1px solid var(--border); border-radius: 10px; cursor: pointer;
}
.plan:has(input:checked) { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.plan input { width: auto; margin: 0; }
.plan-name { font-weight: 600; }
.plan-price { font-weight: 700; color: var(--accent-dark); }
.plan-price small { color: var(--muted); font-weight: 400; }
.history-title { font-size: 1rem; text-align: left; margin: 24px 0 4px; }
.actions form { display: grid; }
.nav { display: flex; gap: 16px; margin-right: auto; margin-left: 20px; font-size: .9rem; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover { color: var(--accent-dark); }