:root {
  --bg: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --card: #f3f4f6;
  --accent: #2563eb;
  --danger: #dc2626;
  --radius: 16px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.container {
  max-width: 520px;
  margin: 0 auto;
  padding: 20px;
}

.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
}

h1 { margin: 0 0 8px; font-size: 22px; }
h2 { margin: 0 0 12px; font-size: 18px; }
p { margin: 8px 0; color: var(--muted); line-height: 1.5; }

.row { margin: 12px 0; }
label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
input, textarea {
  width: 100%;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 15px;
  outline: none;
  background: #fff;
}
textarea { min-height: 120px; resize: vertical; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 0;
  border-radius: 999px;
  padding: 10px 14px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}
.btn:active { transform: translateY(1px); }

.small { font-size: 12px; color: var(--muted); }
.nav { display:flex; gap:10px; margin-top:12px; flex-wrap:wrap; }
a.link { color: var(--accent); text-decoration: none; font-weight: 600; }
a.link:hover { text-decoration: underline; }