* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  background: #fff; /* ←常に白！ */
}

body {
  font-family: 'Noto Sans JP', sans-serif;
  color: #333;
  text-align: center;
}

.card-header {
  width: 100vw;
  position: relative;
  left: 50%;
  margin-left: -50vw;
  background: #004c97;
  color: #fff;
  padding: 2rem 0 1.2rem 0;
  text-align: center;
  z-index: 10;
  margin-top: 0;
  margin-bottom: 2rem; /* カードとの間に余白 */
}

.container {
  width: 90%;
  max-width: 480px;
  margin: 0 auto;
}

@media (min-width: 600px) {
  .container { max-width: 600px; }
}
@media (min-width: 900px) {
  .container { max-width: 800px; }
}

.card {
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  overflow: hidden;
  padding: 2rem;
}

.card-header h2 {
  font-size: 1.8rem;
  margin-bottom: .5rem;
}
.card-header h2 a {
  font: inherit;
  color: inherit;
  text-decoration: none;
}
.card-header p {
  font-size: .95rem;
  opacity: .9;
  margin-bottom: 0;
}

.card-body {
  padding: 2rem;
  text-align: left;
  padding-bottom: 1.5rem;
}

.price {
  text-align: center;
  font-size: 2rem;
  margin: 1rem 0;
}
.price span { font-size: 1rem; color: #666; }

.form-group { margin-bottom: 1.5rem; }
.form-group label {
  display: block;
  margin-bottom: .5rem;
  font-weight: 500;
}
.form-group input {
  width: 100%;
  padding: .75rem;
  border: 1px solid #ccd6eb;
  border-radius: 4px;
  font-size: 1rem;
}
.form-group small {
  display: block;
  margin-top: .25rem;
  color: #666;
  font-size: .85rem;
}

.payjp-button { margin-top: 1.5rem; }


/* PAY.JP チェックアウトのボタンサイズ調整 */
#payjp_checkout_box input[type=button],
#payjp_checkout_box input[type=submit],
#payjp_checkout_box input[type="button"],
#payjp_checkout_box input[type="submit"] {
  padding: 1.2rem 2.4rem;
  width: 40%;
  text-align: center;
  box-sizing: border-box;
  font-size: 17px;
}
#payjp_checkout_box input[type="button"] {
  font-size: 18px;
}
#payjp_checkout_box input[type="submit"] {
  font-size: 1.4rem;
}

/* ──────────── セキュリティ説明強調 ──────────── */

.security {
  font-size: .85rem;
  color: #004c97;
  text-align: center;
  margin-top: 1.5rem;
  margin-bottom: 0;
}

.btn {
  display: block;
  width: 100%;
  max-width: 300px;
  margin: 1.5rem auto 0;
  text-align: center;
  background: linear-gradient(135deg, #28a745, #20c997);
  color: #fff;
  border: none;
  padding: 1rem;
  font-size: 1.2rem;
  border-radius: 4px;
  cursor: pointer;
  transition: background .3s;
}
.pay-button {
  font-size: 1.5rem;
  padding: 1.2rem 2.4rem;
  display: inline-block;
}
.btn:hover {
  background: linear-gradient(135deg, #218838, #17a2b8);
}

.note { font-size: .85rem; color: #555; margin-top: .5rem; }
.info { margin-bottom: 1.5rem; }
.info h3 { font-size: 1.1rem; margin-bottom: .5rem; color: #004c97; }
.info p {
  font-family: monospace;
  background: #f1f5f9;
  padding: .75rem;
  border-radius: 4px;
  word-break: break-all;
}

/* スマホ最適化 */
@media (max-width: 600px) {
  .container {
    width: 98vw;
    max-width: none;
    padding: 0;
  }
  body { overflow-x: hidden; }
  .container {
    width: 100vw !important;
    max-width: none !important;
    padding: 0 !important;
    margin: 0 !important;
  }
  .card {
    width: 100vw !important;
    border-radius: 0 !important;
    margin: 0 !important;
    box-shadow: none !important;
    padding: 1.2rem 0.2rem !important;
  }
  .card-header {
    padding: 1.2rem 0 1rem 0;
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
  }
  .price { font-size: 2.3rem; }
  .btn { font-size: 1rem; padding: 1rem; }
}
@media (max-width: 375px) {
  .container { width: 100vw; max-width: none; }
  .card-header, .card-body { padding: 0.5rem; }
  .btn { font-size: 0.9rem; padding: 0.75rem; }
}