:root{
  --navy:#1f3556;
  --orange:#f57c1f;
  --ink:#1b1f23;
  --muted:#6b7280;
  --line:#e5e7eb;
  --ok:#16a34a;
  --ng:#dc2626;
  --radius:12px;
}

.contact{padding:48px 16px}
.contact__container{width:min(900px, 92%); margin-inline:auto}
.contact__title{
  margin:0 0 8px;
  font-size: clamp(22px, 3.2vw, 32px);
  font-weight:800; color:var(--ink);
}
.contact__lead{
  margin:0 0 24px;
  color:var(--muted); line-height:1.8;
}
.req-note{display:block; font-size:13px; color:#9aa1ab; margin-top:6px}

.contact-form{
  background:#fff; border:1px solid var(--line);
  border-radius:16px; padding:22px;
  box-shadow:0 2px 12px rgba(16,24,40,.04);
}

.form-field{margin-bottom:18px}
.form-label{
  display:block; font-weight:700; color:var(--ink);
  margin:0 0 6px;
}
.req{color:#ef4444; margin-left:4px}
.form-input, .form-textarea{
  width:95%; padding:12px 14px;
  border:1px solid var(--line); border-radius:10px;
  font-size:16px; color:var(--ink);
  background:#fff; outline:none;
}
.form-input:focus, .form-textarea:focus{
  border-color:#cbd5e1; box-shadow:0 0 0 3px rgba(31,53,86,.12);
}
.form-help{display:block; margin-top:6px; color:#9aa1ab; font-size:12.5px}

/* HTML5 簡易バリデーション時の視覚フィードバック */
.form-input:required:invalid,
.form-textarea:required:invalid{
  border-color:#f3b1b1;
}
.form-input:required:valid,
.form-textarea:required:valid{
  border-color:#b8e2c5;
}

.form-actions{margin-top:10px}
.btn-submit{
  display:inline-block; padding:12px 22px;
  border-radius:999px; border:1px solid transparent;
  background:var(--orange); color:#fff; font-weight:800;
  cursor:pointer; transition:filter .2s ease;
}
.btn-submit:hover{filter:brightness(.95)}

.form-result{
  margin-top:14px; padding:10px 12px; border-radius:10px; font-size:14px
}
.form-result--ok{background:#ecfdf5; color:var(--ok); border:1px solid #a7f3d0}
.form-result--ng{background:#fef2f2; color:var(--ng); border:1px solid #fecaca}

/* レスポンシブ */
@media (min-width: 768px){
  .contact{padding:56px 16px}
  .contact-form{padding:26px}
}