/* =========================================================
   車トラブル解決ガイド  共通スタイル
   モバイル優先 / 記事LP型 / 中立的で信頼感のあるトーン
   ========================================================= */

:root {
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;
  --color-text: #23282d;
  --color-muted: #5b6470;
  --color-border: #e3e7ec;
  --color-primary: #1f6f6b;       /* 落ち着いたティール（公式保険会社の青を避ける） */
  --color-primary-dark: #155551;
  --color-accent: #e6a23c;        /* 注意・アクセント */
  --color-note-bg: #fff8ec;
  --color-note-border: #f0d9a8;
  --color-warn-bg: #fdeeee;
  --color-warn-border: #e9c2c2;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0, 0, 0, .06), 0 1px 2px rgba(0, 0, 0, .04);
  --maxw: 760px;
  --font: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN",
          "Hiragino Sans", "Noto Sans JP", Meiryo, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-text-size-adjust: 100%;
}

img { max-width: 100%; height: auto; }

a { color: var(--color-primary-dark); }

/* ---------- ヘッダー ---------- */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
}
.site-header__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.site-logo {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  line-height: 1.3;
}
.site-logo span {
  display: block;
  font-size: .68rem;
  font-weight: 400;
  color: var(--color-muted);
}
.nav-toggle {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: 6px;
  padding: 8px 10px;
  font-size: .85rem;
  cursor: pointer;
  color: var(--color-text);
}

/* ---------- サイト内ナビ ---------- */
.site-nav {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}
.site-nav ul {
  display: none;
  list-style: none;
  margin: 0;
  padding: 4px 8px 10px;
  max-width: var(--maxw);
  margin: 0 auto;
}
.site-nav.is-open ul { display: block; }
.site-nav li { border-bottom: 1px solid var(--color-border); }
.site-nav li:last-child { border-bottom: none; }
.site-nav a {
  display: block;
  padding: 11px 8px;
  text-decoration: none;
  color: var(--color-text);
  font-size: .95rem;
}
.site-nav a:hover { color: var(--color-primary-dark); }

/* ---------- パンくず ---------- */
.breadcrumb {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 10px 16px 0;
  font-size: .78rem;
  color: var(--color-muted);
}
.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin: 0;
  padding: 0;
}
.breadcrumb li::after { content: "›"; margin-left: 4px; color: var(--color-border); }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb a { color: var(--color-muted); text-decoration: none; }

/* ---------- 本文レイアウト ---------- */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }

main { display: block; }

.article {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin: 16px auto;
  padding: 22px 18px 28px;
  max-width: var(--maxw);
}

.article__eyebrow {
  display: inline-block;
  font-size: .72rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  background: #e7f1f0;
  border-radius: 999px;
  padding: 3px 12px;
  margin-bottom: 10px;
}

h1 {
  font-size: 1.5rem;
  line-height: 1.5;
  margin: 0 0 12px;
}
.article__meta {
  font-size: .78rem;
  color: var(--color-muted);
  margin-bottom: 18px;
  border-bottom: 1px dashed var(--color-border);
  padding-bottom: 14px;
}
.article__lead {
  font-size: 1rem;
  color: var(--color-text);
  background: #f2f6f6;
  border-left: 4px solid var(--color-primary);
  padding: 14px 16px;
  border-radius: 0 8px 8px 0;
  margin: 0 0 22px;
}

h2 {
  font-size: 1.22rem;
  margin: 32px 0 12px;
  padding: 8px 0 8px 12px;
  border-left: 5px solid var(--color-primary);
  line-height: 1.5;
}
h3 {
  font-size: 1.05rem;
  margin: 24px 0 8px;
  padding-bottom: 4px;
  border-bottom: 2px solid var(--color-border);
}

p { margin: 0 0 16px; }

ul, ol { padding-left: 1.4em; margin: 0 0 16px; }
li { margin-bottom: 6px; }

/* ---------- 目次 ---------- */
.toc {
  background: #fafbfc;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 14px 16px 14px 34px;
  margin: 0 0 24px;
}
.toc__title {
  font-weight: 700;
  font-size: .95rem;
  margin-left: -16px;
  margin-bottom: 6px;
}
.toc a { color: var(--color-primary-dark); }

/* ---------- テーブル ---------- */
.table-wrap { overflow-x: auto; margin: 0 0 18px; }
table {
  border-collapse: collapse;
  width: 100%;
  font-size: .9rem;
  min-width: 460px;
}
th, td {
  border: 1px solid var(--color-border);
  padding: 9px 10px;
  text-align: left;
  vertical-align: top;
}
th { background: #eef3f3; font-weight: 600; }

/* ---------- 注意書き / 補足 ---------- */
.note, .disclaimer, .ad-label {
  border-radius: 8px;
  padding: 14px 16px;
  font-size: .9rem;
  margin: 0 0 18px;
}
.note {
  background: var(--color-note-bg);
  border: 1px solid var(--color-note-border);
}
.note strong { color: #9a6b12; }

.warn {
  background: var(--color-warn-bg);
  border: 1px solid var(--color-warn-border);
  border-radius: 8px;
  padding: 14px 16px;
  font-size: .9rem;
  margin: 0 0 18px;
}

/* ---------- CTA ---------- */
.cta {
  background: linear-gradient(180deg, #f0f7f6, #e7f1f0);
  border: 1px solid #cfe2e0;
  border-radius: var(--radius);
  padding: 20px 18px;
  text-align: center;
  margin: 26px 0;
}
.cta p { margin: 0 0 14px; font-size: .95rem; color: var(--color-muted); }
.btn {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 13px 22px;
  border-radius: 8px;
  font-size: .98rem;
  transition: background .15s ease;
  border: none;
  cursor: pointer;
}
.btn:hover { background: var(--color-primary-dark); }
.btn--ghost {
  background: transparent;
  color: var(--color-primary-dark);
  border: 1px solid var(--color-primary);
}
.btn--ghost:hover { background: #e7f1f0; }
.cta .btn { margin: 4px; }

/* ---------- FAQ ---------- */
.faq { margin: 24px 0; }
.faq__item {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  margin-bottom: 10px;
  background: var(--color-surface);
  overflow: hidden;
}
.faq__q {
  margin: 0;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 14px 42px 14px 16px;
  font-size: .98rem;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  color: var(--color-text);
  line-height: 1.6;
}
.faq__q::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.2rem;
  color: var(--color-primary);
}
.faq__item.is-open .faq__q::after { content: "−"; }
.faq__a {
  display: none;
  padding: 0 16px 14px;
  font-size: .92rem;
  color: var(--color-muted);
}
.faq__item.is-open .faq__a { display: block; }

/* ---------- 関連記事 ---------- */
.related { margin: 28px 0; }
.related__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}
.related__card {
  display: block;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 14px 16px;
  text-decoration: none;
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color .15s ease;
}
.related__card:hover { border-color: var(--color-primary); }
.related__card .cat {
  font-size: .72rem;
  color: var(--color-primary-dark);
  display: block;
  margin-bottom: 2px;
}
.related__card .ttl { font-weight: 600; font-size: .95rem; }

/* ---------- カード一覧（トップ） ---------- */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 18px 0 8px;
}
.topic-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 18px;
  text-decoration: none;
  color: var(--color-text);
  box-shadow: var(--shadow);
  transition: transform .12s ease, border-color .15s ease;
}
.topic-card:hover { border-color: var(--color-primary); transform: translateY(-2px); }
.topic-card .cat {
  font-size: .72rem;
  color: var(--color-primary-dark);
  font-weight: 600;
}
.topic-card h3 { border: none; margin: 4px 0 6px; padding: 0; font-size: 1.05rem; }
.topic-card p { font-size: .88rem; color: var(--color-muted); margin: 0; }

/* ---------- フッター ---------- */
.site-footer {
  background: #1f2429;
  color: #c8ced4;
  margin-top: 40px;
  padding: 28px 16px 36px;
  font-size: .85rem;
}
.site-footer__inner { max-width: var(--maxw); margin: 0 auto; }
.site-footer h4 { color: #fff; font-size: .95rem; margin: 0 0 10px; }
.site-footer ul { list-style: none; padding: 0; margin: 0 0 18px; }
.site-footer li { margin-bottom: 6px; }
.site-footer a { color: #c8ced4; text-decoration: none; }
.site-footer a:hover { color: #fff; text-decoration: underline; }
.site-footer__disclaimer {
  border-top: 1px solid #353c43;
  padding-top: 16px;
  font-size: .76rem;
  color: #8b939b;
  line-height: 1.7;
}
.site-footer__copy {
  margin-top: 14px;
  font-size: .74rem;
  color: #6f777e;
}

/* ---------- ユーティリティ ---------- */
.muted { color: var(--color-muted); }
.small { font-size: .8rem; }
.center { text-align: center; }
.updated { font-size: .76rem; color: var(--color-muted); }

/* ---------- レスポンシブ（タブレット以上） ---------- */
@media (min-width: 720px) {
  body { font-size: 17px; }
  .nav-toggle { display: none; }
  .site-nav ul {
    display: flex !important;
    flex-wrap: wrap;
    gap: 2px 4px;
    padding: 6px 8px;
  }
  .site-nav li { border: none; }
  .site-nav a { padding: 8px 10px; border-radius: 6px; }
  .site-nav a:hover { background: #eef3f3; }
  h1 { font-size: 1.8rem; }
  .card-grid { grid-template-columns: 1fr 1fr; }
  .related__grid { grid-template-columns: 1fr 1fr; }
}