:root {
  --navy: #203f5d;
  --navy-deep: #152d45;
  --red: #a64f52;
  --ink: #26313a;
  --muted: #6b747b;
  --line: #d8dfe4;
  --paper: #fff;
  --ground: #f6f4ef;
}
* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: var(--ground); font-family: "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif; line-height: 1.7; }
.page { width: min(900px, calc(100% - 32px)); margin: 36px auto 64px; }
.page-header { padding: 30px 0 24px; border-bottom: 3px solid var(--navy); }
.eyebrow { margin: 0 0 8px; color: var(--red); font-size: .78rem; font-weight: 700; letter-spacing: .14em; }
h1 { margin: 0; color: var(--navy-deep); font-size: clamp(1.7rem, 4vw, 2.35rem); line-height: 1.35; }
.intro { margin: 16px 0 0; color: #4e5962; }
.intro strong { color: var(--red); }
.sheet-download { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin: 24px 0; padding: 20px 22px; border: 1px solid #d9d1c3; border-left: 5px solid var(--red); border-radius: 6px; background: #fffdf8; }
.sheet-download h2 { margin: 0; color: var(--navy); font-size: 1.12rem; }
.sheet-download p { margin: 4px 0 0; color: var(--muted); font-size: .92rem; }
.download-link { flex: 0 0 auto; display: inline-block; padding: 10px 16px; border: 1px solid var(--navy); border-radius: 4px; color: var(--navy); font-weight: 700; text-decoration: none; }
.download-link:hover, .download-link:focus { color: white; background: var(--navy); }
.reservation-form { padding: 6px 28px 30px; border-radius: 8px; background: var(--paper); box-shadow: 0 4px 18px #142d4510; }
fieldset { min-width: 0; margin: 0; padding: 25px 0; border: 0; border-bottom: 1px solid var(--line); }
legend { width: 100%; padding: 0 0 13px; color: var(--navy); font-size: 1.18rem; font-weight: 700; }
.field-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 20px; }
.field { display: block; margin: 0 0 16px; font-weight: 600; }
.field input, .field select, .field textarea { display: block; width: 100%; margin-top: 7px; padding: 11px 12px; border: 1px solid #b9c2ca; border-radius: 4px; background: #fff; color: var(--ink); font: inherit; font-weight: 400; }
.field textarea { min-height: 120px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: 3px solid #2b668322; border-color: var(--navy); }
.required { margin-left: 6px; color: var(--red); font-size: .78rem; font-weight: 700; }
.optional { margin-left: 6px; color: var(--muted); font-size: .78rem; font-weight: 500; }
.choice-row, .choice-grid { display: flex; flex-wrap: wrap; gap: 12px 24px; }
.choice-row label, .choice-grid label, .consent { display: inline-flex; align-items: center; gap: 8px; min-height: 36px; cursor: pointer; }
input[type="checkbox"], input[type="radio"] { width: 18px; height: 18px; accent-color: var(--navy); }
.returning-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 20px; margin-top: 18px; padding: 18px; border-radius: 5px; background: #f4f7f8; }
.returning-fields[hidden] { display: none; }
.returning-fields .field { margin: 0; }
.field-error { min-height: 1.4em; margin: 4px 0 0; color: #a3272e; font-size: .88rem; }
.choice-grid.invalid { outline: 2px solid #a3272e; outline-offset: 5px; }
.consent-fieldset { border-bottom: 0; }
.submit-button { display: block; width: min(360px, 100%); margin: 24px auto 0; padding: 14px 22px; border: 0; border-radius: 5px; background: var(--navy); color: #fff; font: inherit; font-size: 1.05rem; font-weight: 700; cursor: pointer; }
.submit-button:hover, .submit-button:focus { background: var(--navy-deep); }
.fine-print { margin: 12px auto 0; color: var(--muted); font-size: .84rem; text-align: center; }
.page-footer { padding-top: 24px; color: var(--muted); font-size: .9rem; text-align: center; }
.result { padding: 36px; border-radius: 8px; background: #fff; }
.result a { color: var(--navy); }
.field-note { grid-column: 1 / -1; margin: -4px 0 0; color: var(--muted); font-size: .88rem; }
.confirmation-panel { padding: 24px 28px; border-radius: 8px; background: #fff; box-shadow: 0 4px 18px #142d4510; }
.confirmation-list { display: grid; grid-template-columns: minmax(150px, 1fr) 2fr; margin: 0; }
.confirmation-list dt, .confirmation-list dd { margin: 0; padding: 12px 10px; border-bottom: 1px solid var(--line); overflow-wrap: anywhere; }
.confirmation-list dt { color: var(--navy); font-weight: 700; }
.confirmation-list dd { white-space: normal; }
.confirm-actions { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 18px; margin: 24px 0 0; }
.confirm-actions form { margin: 0; }
.confirm-actions .submit-button { margin: 0; }
.back-link { display: inline-block; padding: 12px; border: 1px solid var(--navy); border-radius: 5px; background: #fff; font: inherit; text-align: center; color: var(--navy); cursor: pointer; }
.preview-banner { margin: 0 0 18px; padding: 10px 14px; border-left: 4px solid #a64f52; background: #fff2ed; color: #6c2d31; font-weight: 700; }
.preview-status { margin: 18px 0 0; padding: 10px 14px; border-radius: 5px; background: #edf3f5; color: var(--navy-deep); text-align: center; }
.trap { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
@media (max-width: 640px) {
  .page { width: min(100% - 22px, 900px); margin-top: 16px; }
  .page-header { padding-top: 18px; }
  .sheet-download { align-items: stretch; flex-direction: column; gap: 12px; padding: 16px; }
  .download-link { text-align: center; }
  .reservation-form { padding: 0 16px 24px; }
  .field-grid, .returning-fields { grid-template-columns: 1fr; gap: 0; }
  fieldset { padding: 21px 0; }
  .choice-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 12px; }
  .confirmation-panel { padding: 16px; }
  .confirmation-list { grid-template-columns: 1fr; }
  .confirmation-list dt { padding-bottom: 0; border-bottom: 0; }
  .confirmation-list dd { padding-top: 3px; }
  .confirm-actions { grid-template-columns: 1fr; }
}

/* メールアドレス確認欄 */
.field-help { display: block; margin: 6px 0 0; color: var(--muted); font-size: .85rem; font-weight: 400; line-height: 1.6; }
.field input:user-invalid { border-color: #a3272e; }