/* くらしの目安帳（fn- 接頭辞でスコープ） */
:root {
  --fn-bg: #fbf8f3;
  --fn-surface: #ffffff;
  --fn-text: #2b2a28;
  --fn-muted: #6b675f;
  --fn-line: #e6e0d6;
  --fn-input-border: #8f877a; /* 白背景とのコントラスト 3.55:1 */
  --fn-accent: #c2410c;
  --fn-accent-dark: #9a3412;
  --fn-soft: #fff1e6;
  --fn-radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--fn-bg);
  color: var(--fn-text);
  font-family: "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", "Meiryo", sans-serif;
  line-height: 1.75;
  font-size: 16px;
}

a { color: var(--fn-accent-dark); }

.fn-container { width: 100%; max-width: 1040px; margin: 0 auto; padding: 0 16px; }
.fn-sp { display: none; }

.fn-header { background: var(--fn-surface); border-bottom: 1px solid var(--fn-line); }
.fn-header__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 4px 16px; padding-top: 12px; padding-bottom: 12px; }
.fn-logo { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; text-decoration: none; color: var(--fn-text); }
.fn-logo__icon { display: block; flex-shrink: 0; }
.fn-nav { display: flex; gap: 16px; font-size: 14px; }
.fn-nav a { text-decoration: none; }
.fn-nav a[aria-current="page"] { font-weight: 700; text-decoration: underline; text-underline-offset: 4px; }

.fn-pr {
  margin: 0;
  padding: 6px 16px;
  font-size: 12px;
  text-align: center;
  color: var(--fn-muted);
  background: #f3eee6;
}

.fn-hero { padding: 40px 0 24px; }
.fn-hero__title { margin: 0 0 12px; font-size: clamp(26px, 5vw, 38px); line-height: 1.35; }
.fn-hero__lead { margin: 0; max-width: 680px; color: var(--fn-muted); }

.fn-card {
  background: var(--fn-surface);
  border: 1px solid var(--fn-line);
  border-radius: var(--fn-radius);
  padding: 20px;
}
.fn-card__title { margin: 0 0 16px; font-size: 18px; }

.fn-calc__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; align-items: start; }

.fn-field { display: block; border: 0; padding: 0; margin: 0 0 18px; }
.fn-field__label { display: block; font-weight: 700; margin-bottom: 6px; font-size: 15px; }
.fn-input-unit { display: flex; align-items: center; gap: 8px; }
.fn-input-unit input {
  width: 100%;
  max-width: 200px;
  font-size: 20px;
  padding: 8px 12px;
  border: 1px solid var(--fn-input-border);
  border-radius: 8px;
}
.fn-radio { display: block; padding: 4px 0; }
.fn-deps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; font-size: 13px; }
.fn-deps select { display: block; width: 100%; margin-top: 4px; padding: 6px; font-size: 16px; border: 1px solid var(--fn-input-border); border-radius: 6px; background: #fff; }
.fn-note { margin: 6px 0 0; font-size: 13px; color: var(--fn-muted); }
.fn-details summary { cursor: pointer; color: var(--fn-accent-dark); margin-bottom: 12px; }

.fn-result { position: sticky; top: 16px; border-color: #f2c9a8; }
.fn-result__amount {
  margin: 0;
  font-size: clamp(36px, 7vw, 48px);
  font-weight: 700;
  color: var(--fn-accent);
  line-height: 1.2;
}
.fn-result__amount small { font-size: 20px; margin-left: 4px; }
.fn-result__message { margin: 4px 0 16px; }
.fn-error { margin: 0 0 16px; padding: 8px 12px; border-radius: 8px; background: #fde8e8; color: #9b1c1c; font-size: 14px; }

.fn-breakdown { margin: 0 0 12px; border-top: 1px solid var(--fn-line); }
.fn-breakdown div { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--fn-line); font-size: 14px; }
.fn-breakdown dt { color: var(--fn-muted); }
.fn-breakdown dd { margin: 0; font-variant-numeric: tabular-nums; }

.fn-tools, .fn-plan, .fn-guide, .fn-caution { padding: 40px 0 0; }
.fn-section-title { font-size: 22px; margin: 0 0 8px; }
.fn-section-lead { margin: 0 0 16px; color: var(--fn-muted); }

.fn-plan__list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  background: var(--fn-surface);
  border: 1px solid var(--fn-line);
  border-radius: var(--fn-radius);
}
.fn-plan__list li { display: flex; justify-content: space-between; gap: 12px; padding: 12px 16px; border-bottom: 1px solid var(--fn-line); }
.fn-plan__list li:last-child { border-bottom: 0; }
.fn-plan__amount { font-variant-numeric: tabular-nums; white-space: nowrap; }
.fn-plan__total { font-weight: 700; background: var(--fn-soft); }

.fn-ad-label { margin: 0 0 4px; font-size: 12px; color: var(--fn-muted); }
.fn-btn {
  display: inline-block;
  padding: 14px 28px;
  background: var(--fn-accent);
  color: #fff;
  font-weight: 700;
  border-radius: 999px;
  text-decoration: none;
}
.fn-btn:hover, .fn-btn:focus-visible { background: var(--fn-accent-dark); }
.fn-btn--outline { background: var(--fn-surface); color: var(--fn-accent-dark); border: 2px solid var(--fn-accent); }
.fn-btn--outline:hover, .fn-btn--outline:focus-visible { background: var(--fn-soft); }

.fn-hayami-link { margin: 16px 0 0; font-size: 15px; }

.fn-portals { margin-top: 32px; }
.fn-portals__title { margin: 0 0 4px; font-size: 19px; }
.fn-portals__list { list-style: none; margin: 8px 0 12px; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.fn-portal { display: flex; flex-direction: column; }
.fn-portal__name { margin: 0 0 6px; font-size: 17px; }
.fn-portal__desc { margin: 0 0 6px; font-size: 14px; }
.fn-portal__for { margin: 0 0 14px; font-size: 13px; color: var(--fn-muted); }
.fn-portal__cta { margin: auto 0 0; }
/* 発行されたリンクのコードは変えずに、外側からボタンの見た目にする */
.fn-portal__cta a {
  display: block;
  padding: 12px 16px;
  border-radius: 999px;
  background: var(--fn-accent);
  color: #fff;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
}
.fn-portal__cta a:hover, .fn-portal__cta a:focus-visible { background: var(--fn-accent-dark); }
.fn-portal__cta img { position: absolute; width: 1px; height: 1px; }

.fn-tools__grid { list-style: none; margin: 0 0 12px; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.fn-tool { display: flex; flex-direction: column; gap: 6px; height: 100%; text-decoration: none; color: var(--fn-text); transition: border-color 0.15s; }
.fn-tool:hover, .fn-tool:focus-visible { border-color: var(--fn-accent); }
.fn-tool__tag { align-self: flex-start; padding: 2px 10px; border-radius: 999px; background: var(--fn-soft); color: var(--fn-accent-dark); font-size: 12px; font-weight: 700; }
.fn-tool__name { font-size: 18px; font-weight: 700; color: var(--fn-accent-dark); }
.fn-tool__desc { font-size: 14px; color: var(--fn-muted); }

.fn-table-wrap {
  overflow-x: auto;
  background: var(--fn-surface);
  border: 1px solid var(--fn-line);
  border-radius: var(--fn-radius);
}
.fn-table-wrap:focus-visible { outline: 2px solid var(--fn-accent); outline-offset: 2px; }
.fn-table { width: 100%; border-collapse: collapse; font-size: 14px; font-variant-numeric: tabular-nums; }
.fn-table caption { padding: 10px 12px; text-align: left; font-size: 13px; color: var(--fn-muted); }
.fn-table th, .fn-table td { padding: 8px 12px; border-top: 1px solid var(--fn-line); white-space: nowrap; }
.fn-table td { text-align: right; }
.fn-table thead th { background: var(--fn-soft); font-size: 13px; text-align: center; white-space: normal; min-width: 88px; }
.fn-table tbody th { text-align: left; font-weight: 700; }
.fn-table tbody tr:nth-child(even) td, .fn-table tbody tr:nth-child(even) th { background: #faf7f2; }
.fn-table th:first-child { position: sticky; left: 0; z-index: 1; background: var(--fn-surface); box-shadow: 1px 0 0 var(--fn-line); }
.fn-table thead th:first-child { background: var(--fn-soft); }
.fn-hayami__notes { margin: 16px 0 0; padding-left: 1.2em; font-size: 14px; color: var(--fn-muted); }

.fn-guide__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.fn-guide h3 { margin: 0 0 8px; font-size: 17px; }
.fn-guide p { margin: 0; font-size: 15px; }

.fn-caution ul { margin: 0; padding-left: 1.2em; font-size: 15px; }

.fn-footer { margin-top: 56px; padding: 24px 0; background: #2b2a28; color: #d9d4cb; font-size: 13px; }
.fn-footer a { color: #fff; }
.fn-footer__nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.fn-footer p { margin: 8px 0 0; }

.fn-page { padding: 32px 0; }
.fn-page h1 { font-size: 24px; }
.fn-page h2 { font-size: 18px; margin-top: 28px; }

@media (max-width: 860px) {
  .fn-calc__grid, .fn-guide__grid, .fn-tools__grid, .fn-portals__list { grid-template-columns: 1fr; }
  .fn-result { position: static; }
}

@media (max-width: 480px) {
  .fn-sp { display: inline; }
  .fn-hero { padding: 28px 0 16px; }
  .fn-deps { grid-template-columns: 1fr; }
  .fn-btn { display: block; text-align: center; }
}