/* Phase 7 残 (2026-05-28): 公開ランディング /signup の最小スタイル */
* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  margin: 0;
  padding: 0;
  background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
  color: #1f2937;
  line-height: 1.5;
}
header {
  text-align: center;
  padding: 2.5rem 1rem 1.5rem;
}
header h1 {
  font-size: 2rem;
  margin: 0;
}
.tagline {
  margin: 0.5rem 0 0;
  color: #6b7280;
  font-size: 1rem;
}
main {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 1rem 2rem;
}
.hero {
  text-align: center;
  margin-bottom: 2rem;
}
.hero h2 {
  margin: 0 0 1rem;
  font-size: 1.5rem;
}
.benefits {
  list-style: none;
  padding: 0;
  text-align: left;
  display: inline-block;
}
.benefits li {
  margin: 0.5rem 0;
  font-size: 1rem;
}
.card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  margin-bottom: 1rem;
}
.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.2rem;
}
.hint {
  color: #6b7280;
  font-size: 0.85rem;
  margin: 0 0 1rem;
}
.honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.field {
  display: block;
  margin-bottom: 1rem;
}
.field > span {
  display: block;
  margin-bottom: 0.25rem;
  font-size: 0.85rem;
  font-weight: 500;
}
.field input,
.field select {
  width: 100%;
  padding: 0.6rem;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  font-size: 0.95rem;
  background: #fff;
}
.field input:focus,
.field select:focus {
  outline: none;
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}
button[type="submit"] {
  width: 100%;
  padding: 0.85rem;
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 1rem;
}
button[type="submit"]:hover {
  filter: brightness(1.05);
}
button[type="submit"]:disabled {
  background: #9ca3af;
  cursor: wait;
}
.legal {
  font-size: 0.75rem;
  color: #6b7280;
  text-align: center;
  margin: 0.5rem 0 0;
}
.alert {
  padding: 0.75rem 1rem;
  border-radius: 6px;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}
.alert-error {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}
.alert-success {
  background: #ecfdf5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}
.success {
  border-color: #a7f3d0;
  background: #f0fdf4;
}
.success ul {
  padding-left: 1.5rem;
}
.success a {
  color: #2563eb;
  font-weight: 600;
}
footer {
  text-align: center;
  padding: 1rem;
}
.muted {
  color: #6b7280;
}
.small {
  font-size: 0.8rem;
}
.hidden { display: none; }