/* 共通スタイル(スマホファースト・ビルド不要)
   全ページから <link rel="stylesheet" href="/shared/style.css"> で参照する
   方針: 計算機が主役。一目で使い方がわかり、余計なものは目に入れない */

:root {
  --color-bg: #ffffff;
  --color-surface: #f7f9fa;
  --color-text: #1f2933;
  --color-muted: #5b6770;
  --color-accent: #0b6e4f;
  --color-accent-weak: #e6f4ef;
  --color-border: #d9e2ec;
  --color-warn-bg: #fff8e6;
  --color-warn-border: #e0c179;
  --max-width: 720px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #14181c;
    --color-surface: #1b2127;
    --color-text: #e4e9ee;
    --color-muted: #9aa7b2;
    --color-accent: #4cc39a;
    --color-accent-weak: #1c2b26;
    --color-border: #313b45;
    --color-warn-bg: #2b2517;
    --color-warn-border: #8a743d;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif;
  line-height: 1.8;
  color: var(--color-text);
  background: var(--color-bg);
  font-size: 16px;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 16px 48px;
}

h1 { font-size: 1.4rem; line-height: 1.4; margin: 0.9em 0 0.5em; }
h2 {
  font-size: 1.2rem;
  margin: 2em 0 0.6em;
  padding-left: 0.5em;
  border-left: 4px solid var(--color-accent);
}
h3 { font-size: 1.05rem; margin: 1.5em 0 0.5em; }

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

/* ヘッダ: ブランドと検索導線だけの最小構成 */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  max-width: var(--max-width);
  margin: 0 auto;
}
.site-brand {
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--color-text);
  white-space: nowrap;
}
.site-search-link {
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 5px 12px;
  white-space: nowrap;
}
.site-search-link:hover { color: var(--color-accent); border-color: var(--color-accent); }

/* フッタ: 必要事項はここに集約 */
.site-footer {
  border-top: 1px solid var(--color-border);
  margin-top: 48px;
  padding: 24px 16px 40px;
  font-size: 0.8rem;
  color: var(--color-muted);
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
}
.site-footer nav { display: flex; flex-wrap: wrap; gap: 4px 14px; margin-bottom: 8px; }
.site-footer a { color: var(--color-muted); }

/* サイト内検索(トップページ) */
.tool-search {
  position: relative;
  margin: 4px 0 20px;
}
.tool-search input {
  width: 100%;
  font-size: 1.05rem;
  padding: 13px 16px 13px 44px;
  border: 2px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface);
  color: var(--color-text);
  -webkit-appearance: none;
}
.tool-search input:focus {
  outline: none;
  border-color: var(--color-accent);
  background: var(--color-bg);
}
.tool-search::before {
  content: "🔍";
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1rem;
  pointer-events: none;
}
.search-status { font-size: 0.85rem; color: var(--color-muted); margin: -10px 0 14px; }

/* ツールカード(トップページ) */
.tool-section h3 {
  font-size: 0.85rem;
  color: var(--color-muted);
  letter-spacing: 0.08em;
  margin: 1.6em 0 0.5em;
}
.tool-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.tool-card {
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-bg);
}
.tool-card > a {
  display: block;
  padding: 13px 16px;
  text-decoration: none;
  color: inherit;
  border-radius: 12px;
}
.tool-card > a:active { background: var(--color-accent-weak); }
.tool-card .tool-name { font-weight: 700; font-size: 1.02rem; color: var(--color-accent); }
.tool-card p { margin: 4px 0 0; font-size: 0.85rem; color: var(--color-muted); line-height: 1.6; }
.tool-card[hidden] { display: none; }

/* ツールの入力フォーム(ページの主役) */
.tool-form {
  border: 1.5px solid var(--color-accent);
  border-radius: 14px;
  padding: 18px 16px;
  display: grid;
  gap: 14px;
  margin: 14px 0;
  background: var(--color-surface);
}
.tool-form label { font-weight: 600; font-size: 0.92rem; display: block; }
.tool-form .field-note { font-weight: 400; color: var(--color-muted); font-size: 0.8rem; }
.tool-form input[type="number"],
.tool-form input[type="text"],
.tool-form input[type="date"],
.tool-form input[type="time"],
.tool-form select,
.tool-form textarea {
  width: 100%;
  font-size: 1.1rem;
  padding: 10px 12px;
  margin-top: 4px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg);
  color: var(--color-text);
}
.tool-form button {
  font-size: 1.05rem;
  font-weight: 700;
  padding: 13px;
  border: none;
  border-radius: 10px;
  background: var(--color-accent);
  color: #fff;
  cursor: pointer;
}
.tool-form button:active { opacity: 0.85; }

/* 計算結果 */
.tool-result {
  border-radius: 14px;
  background: var(--color-accent-weak);
  padding: 16px;
  margin: 16px 0;
}
.tool-result[hidden] { display: none; }
.tool-result .result-main { font-size: 1.6rem; font-weight: 700; }
.tool-result .result-error { color: #b3261e; font-weight: 600; }
@media (prefers-color-scheme: dark) {
  .tool-result .result-error { color: #ff8a80; }
}

/* 注意書き */
.note-box {
  background: var(--color-warn-bg);
  border: 1px solid var(--color-warn-border);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 0.88rem;
  margin: 16px 0;
}

/* 表 */
.data-table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
.data-table th, .data-table td {
  border: 1px solid var(--color-border);
  padding: 8px 10px;
  text-align: left;
}
.data-table th { background: var(--color-accent-weak); }
.table-scroll { overflow-x: auto; }

/* 出典リスト */
.sources { font-size: 0.88rem; }
.sources li { margin-bottom: 4px; }

@media (min-width: 600px) {
  h1 { font-size: 1.6rem; }
  .tool-list { grid-template-columns: 1fr 1fr; }
}

/* ➕詳細機能(こだわり派向けの折りたたみ) */
.adv-box {
  border: 1.5px dashed var(--color-border);
  border-radius: 12px;
  margin: 14px 0;
}
.adv-box summary {
  list-style: none;
  cursor: pointer;
  padding: 12px 16px;
  font-weight: 700;
  font-size: 0.94rem;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  gap: 8px;
}
.adv-box summary::-webkit-details-marker { display: none; }
.adv-box summary .plus {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.95rem;
  flex: 0 0 auto;
  transition: transform 0.15s;
}
.adv-box[open] summary .plus { transform: rotate(45deg); }
.adv-box[open] { border-style: solid; border-color: var(--color-accent); }
.adv-inner { padding: 4px 16px 16px; display: grid; gap: 12px; }
.adv-inner label { font-weight: 600; font-size: 0.9rem; display: block; }
.adv-inner input[type="number"], .adv-inner input[type="text"], .adv-inner input[type="date"],
.adv-inner input[type="time"], .adv-inner select, .adv-inner textarea {
  width: 100%; font-size: 1.05rem; padding: 9px 12px; margin-top: 4px;
  border: 1px solid var(--color-border); border-radius: 8px;
  background: var(--color-bg); color: var(--color-text);
}
.adv-inner button {
  font-size: 0.98rem; font-weight: 700; padding: 11px;
  border: 1.5px solid var(--color-accent); border-radius: 10px;
  background: var(--color-bg); color: var(--color-accent); cursor: pointer;
}
.adv-inner button:active { background: var(--color-accent-weak); }
.adv-inner .adv-note { font-size: 0.88rem; margin: 0; opacity: 0.85; }
.adv-inner .adv-h { font-size: 0.92rem; margin: 8px 0 0; padding-top: 10px; border-top: 1px solid var(--color-border); }
.adv-inner .adv-h:first-child { border-top: none; padding-top: 0; margin-top: 0; }

/* ===== 説明エリアの読みやすさ改善(2026-07-25) =====
   方針: 文章の羅列をやめ、役割ごとに背景色・バッジ・余白で構造を見せる */

/* リード文: 「このツールでわかること」カード */
.lead-card {
  background: var(--color-accent-weak);
  border-radius: 14px;
  padding: 16px 18px;
  margin: 22px 0;
}
.lead-card .lead-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}
.lead-card p { margin: 0; line-height: 2; }

/* 使い方: 番号バッジ付きステップ */
ol.steps {
  list-style: none;
  counter-reset: steps;
  padding: 0;
  margin: 14px 0;
  display: grid;
  gap: 10px;
}
ol.steps li {
  counter-increment: steps;
  position: relative;
  padding: 10px 14px 10px 48px;
  background: var(--color-surface);
  border-radius: 10px;
  line-height: 1.75;
}
ol.steps li::before {
  content: counter(steps);
  position: absolute;
  left: 12px;
  top: 11px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 計算方法: 1項目=1カード、式はチップで目立たせる */
ul.method {
  list-style: none;
  padding: 0;
  margin: 14px 0;
  display: grid;
  gap: 8px;
}
ul.method li {
  padding: 10px 14px;
  background: var(--color-surface);
  border-radius: 10px;
  line-height: 1.85;
  font-size: 0.95rem;
}
ul.method li strong {
  background: var(--color-accent-weak);
  color: var(--color-accent);
  padding: 1px 7px;
  border-radius: 6px;
  font-weight: 700;
}

/* 注意事項: 色付きコールアウト */
ul.cautions {
  list-style: none;
  padding: 0;
  margin: 14px 0;
  display: grid;
  gap: 8px;
}
ul.cautions li {
  background: var(--color-warn-bg);
  border-left: 3px solid var(--color-warn-border);
  padding: 10px 14px;
  border-radius: 0 10px 10px 0;
  font-size: 0.93rem;
  line-height: 1.75;
}

/* FAQ: Q/Aバッジで対話形式に */
h3.faq-q {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin: 1.6em 0 0.5em;
  font-size: 1rem;
  line-height: 1.6;
}
h3.faq-q::before {
  content: "Q";
  flex: 0 0 auto;
  background: var(--color-accent);
  color: #fff;
  border-radius: 8px;
  padding: 1px 9px;
  font-size: 0.85rem;
  font-weight: 700;
}
p.faq-a {
  background: var(--color-surface);
  border-radius: 10px;
  padding: 12px 14px 12px 40px;
  position: relative;
  margin: 0 0 4px;
  font-size: 0.95rem;
  line-height: 1.85;
}
p.faq-a::before {
  content: "A";
  position: absolute;
  left: 14px;
  top: 12px;
  color: var(--color-accent);
  font-weight: 700;
}

/* 関連ツール: リンクをタップしやすいチップに */
ul.related {
  list-style: none;
  padding: 0;
  margin: 14px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
ul.related li a {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.92rem;
  color: var(--color-text);
  background: var(--color-surface);
}
ul.related li a:hover { border-color: var(--color-accent); color: var(--color-accent); }
@media (prefers-color-scheme: dark) {
  ol.steps li::before, h3.faq-q::before, .adv-box summary .plus { color: #10261e; }
}

/* 横並びの入力行(年月日セレクト等) */
.field-row { display: flex; gap: 8px; }
.field-row label { flex: 1 1 0; min-width: 0; margin: 0; }
.field-row label.grow-2 { flex: 2 1 0; }