:root {
  --ink: #1a1a1a;
  --muted: #5c5c5c;
  --line: #d9d9d9;
  --bg: #f4f4f2;
  --card: #ffffff;
  --accent: #1b3a4b;
  --danger: #9b1c1c;
  --ok: #1f7a4d;
  --focus: #2563eb;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.45;
}

.brand {
  text-align: center;
  padding: 1.25rem 1rem 0.5rem;
}

.logo {
  max-width: 220px;
  width: 70%;
  height: auto;
}

main.card {
  max-width: 32rem;
  margin: 0.75rem auto 2.5rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.25rem 1.25rem 1.5rem;
}

h1 {
  font-size: 1.35rem;
  margin: 0 0 0.75rem;
  color: var(--accent);
}

p { margin: 0 0 0.85rem; }

.muted { color: var(--muted); font-size: 0.95rem; }

label {
  display: block;
  font-weight: 600;
  margin: 0.85rem 0 0.3rem;
}

input[type="text"],
input[type="email"] {
  width: 100%;
  padding: 0.65rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 1rem;
}

input:focus {
  outline: 2px solid var(--focus);
  border-color: var(--focus);
}

.amount-row {
  display: flex;
  align-items: stretch;
}

.amount-prefix {
  display: flex;
  align-items: center;
  padding: 0 0.7rem;
  background: #eef2f4;
  border: 1px solid var(--line);
  border-right: 0;
  border-radius: 6px 0 0 6px;
  font-weight: 600;
  color: var(--accent);
}

.amount-row input {
  border-radius: 0 6px 6px 0;
}

#payment-element {
  margin-top: 0.5rem;
  min-height: 2.5rem;
}

#step-details.is-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
  flex-wrap: wrap;
}

button, .btn {
  appearance: none;
  border: 0;
  border-radius: 6px;
  padding: 0.7rem 1.1rem;
  font-size: 1rem;
  font-weight: 650;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  text-align: center;
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-primary, button[type="submit"], #pay-now, #proceed {
  background: var(--accent);
  color: #fff;
}

.btn-secondary, .btn-back {
  background: #e8eaed;
  color: var(--ink);
}

.error {
  background: #fde8e8;
  color: var(--danger);
  border: 1px solid #f3c1c1;
  border-radius: 6px;
  padding: 0.7rem 0.8rem;
  margin: 0.75rem 0;
}

.ok {
  background: #e7f6ee;
  color: var(--ok);
  border: 1px solid #bfe5cf;
  border-radius: 6px;
  padding: 0.7rem 0.8rem;
  margin: 0.75rem 0;
}

.total {
  font-size: 1.65rem;
  font-weight: 750;
  color: var(--accent);
  margin: 0.4rem 0 0.9rem;
}

dl.breakdown {
  margin: 0 0 1rem;
}

dl.breakdown div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--line);
}

dl.breakdown dt { color: var(--muted); }
dl.breakdown dd { margin: 0; font-weight: 600; }

.notice {
  font-size: 0.95rem;
  color: var(--muted);
}