:root{
  --ink:#0b2a44;
  --muted: rgba(11,42,68,.72);
  --line: rgba(11,42,68,.14);
  --bg:#fff;
  --max: 860px;
}

*{ box-sizing:border-box; }
body{
  margin:0;
  font-family: system-ui, -apple-system, "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  background: var(--bg);
  color: var(--ink);
}

.wrap{
  width: min(var(--max), 100%);
  margin: 0 auto;
  padding: 28px 18px 50px;
}

.ttl{
  margin: 0 0 10px;
  font-size: 26px;
  letter-spacing: .06em;
}
.lead{
  margin: 0 0 22px;
  color: var(--muted);
  line-height: 1.9;
}

.form-error{
  display:none;
  border: 1px solid rgba(220, 50, 50, .35);
  background: rgba(220, 50, 50, .06);
  padding: 12px 14px;
  border-radius: 10px;
  margin: 0 0 14px;
}

.form{
  border: 1px solid rgba(0,0,0,.08);
  border-radius: 14px;
  padding: 18px;
  background: #fff;
}

.grid{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.field{ display:flex; flex-direction:column; gap: 8px; }
.field--full{ grid-column: 1 / -1; }

.field__label{
  font-weight: 700;
  letter-spacing: .04em;
}
.req{
  margin-left: 8px;
  font-size: 12px;
  color: rgba(220, 50, 50, .9);
}

input, textarea{
  width:100%;
  border: 1px solid rgba(0,0,0,.16);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 15px;
  outline: none;
}
input:focus, textarea:focus{
  border-color: rgba(0,176,255,.75);
  box-shadow: 0 0 0 3px rgba(0,176,255,.15);
}

.field__help{
  color: var(--muted);
  font-size: 12px;
}

.agree{
  display:flex;
  align-items:flex-start;
  gap: 10px;
  margin: 14px 0 0;
  color: rgba(11,42,68,.85);
}
.agree input{ width:auto; margin-top: 3px; }

.btn{
  margin-top: 16px;
  display:inline-block;
  padding: 12px 18px;
  border-radius: 999px;
  border: 1px solid rgba(0,0,0,.18);
  background: var(--ink);
  color: #fff;
  text-decoration:none;
  font-weight: 800;
  letter-spacing: .06em;
  cursor: pointer;
}

.back{ margin-top: 18px; }
.back a{ color: var(--muted); text-decoration: none; border-bottom: 1px solid rgba(11,42,68,.25); }

.thanks-box{
  margin-top: 18px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.hp{
  position:absolute;
  left:-9999px;
  width:1px;
  height:1px;
  overflow:hidden;
}

@media (max-width: 780px){
  .grid{ grid-template-columns: 1fr; }
}