:root {
  --bg: #f7f5f1;
  --card: #ffffff;
  --ink: #1a1a1a;
  --muted: #666;
  --accent: #0a7d3a;
  --accent-2: #075c2a;
  --border: #e3e0d8;
  --soft: #f0ede4;
  --err: #b00020;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
}

.card {
  max-width: 680px;
  margin: 32px auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  box-shadow: 0 1px 2px rgba(0,0,0,.03);
}
.card.center { text-align: center; }

h1 { margin: 0 0 8px; font-size: 26px; letter-spacing: -.01em; }
h1.ok  { color: var(--accent); }
h1.err { color: var(--err); }

.lede { color: var(--muted); margin: 0 0 24px; }

fieldset {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
  margin: 0 0 16px;
}
legend { padding: 0 8px; font-weight: 600; color: #333; }

label {
  display: block;
  margin: 12px 0;
  font-size: 14px;
  color: #333;
}

input[type=text],
input[type=email],
input[type=tel],
input[type=number],
textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
  background: #fff;
  margin-top: 4px;
}
input:focus, textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}
small { display: block; color: var(--muted); margin-top: 4px; font-size: 12px; }

.req { color: var(--err); }

.plans { display: grid; gap: 10px; }
.plan {
  display: flex;
  gap: 12px;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  cursor: pointer;
  transition: background .12s, border-color .12s;
  margin: 0;
}
.plan:hover { background: #fafaf6; }
.plan:has(input:checked) {
  border-color: var(--accent);
  background: #f3faf5;
}
.plan input[type=radio] { margin: 0; }
.plan-body { display: grid; flex: 1; }
.plan-name { font-weight: 600; }
.plan-desc { color: var(--muted); font-size: 13px; }
.plan-price { font-weight: 600; color: var(--accent); white-space: nowrap; }

.qty { max-width: 160px; margin-top: 12px; }

.total-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px;
  background: var(--soft);
  border-radius: 10px;
  margin: 16px 0;
  font-size: 18px;
}

.primary {
  display: block;
  width: 100%;
  padding: 14px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s;
}
.primary:hover  { background: var(--accent-2); }
.primary:disabled { background: #999; cursor: wait; }

.note { color: var(--muted); font-size: 12px; text-align: center; margin: 12px 0 0; }

.btn {
  display: inline-block;
  margin-top: 16px;
  padding: 10px 24px;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  text-decoration: none;
}
.btn:hover { background: var(--accent-2); }

code {
  background: var(--soft);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 14px;
}

.kv {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 16px;
  text-align: left;
  max-width: 360px;
  margin: 20px auto;
}
.kv dt { color: var(--muted); font-size: 14px; }
.kv dd { margin: 0; font-weight: 500; }