/* ============================================================
   光熱費ガイド - メインスタイルシート
   Cloudflare Pages 静的サイト用
   ============================================================ */

/* ── リセット / ベース ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN",
               "Hiragino Sans", Meiryo, sans-serif;
  line-height: 1.8;
  color: #111827;
  background: #fff;
}

a { color: #15803d; text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* ── レイアウト ── */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ── ヘッダー ── */
.site-header {
  background: #15803d;
  color: #fff;
  padding: 14px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 6px rgba(0,0,0,.2);
}

.site-header .container {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.site-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
}
.site-logo:hover { text-decoration: none; opacity: .85; }

.site-nav ul {
  display: flex;
  list-style: none;
  gap: 4px;
  flex-wrap: wrap;
}

.site-nav a {
  color: #d1fae5;
  font-size: .85rem;
  padding: 4px 10px;
  border-radius: 4px;
  transition: background .15s;
}
.site-nav a:hover {
  background: rgba(255,255,255,.18);
  text-decoration: none;
  color: #fff;
}

/* ── メインコンテンツ ── */
main.container { padding-top: 36px; padding-bottom: 60px; }

/* ── 記事本文 ── */
.article-body { max-width: 100%; }

.article-date {
  font-size: .82rem;
  color: #6b7280;
  margin-bottom: 20px;
}

.article-body h1 {
  font-size: 1.65rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 20px;
  color: #111827;
  border-left: 5px solid #15803d;
  padding-left: 14px;
}

.article-body h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 40px 0 14px;
  padding: 10px 16px;
  background: #f0fdf4;
  border-left: 4px solid #16a34a;
  border-radius: 0 6px 6px 0;
  color: #14532d;
}

.article-body h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 28px 0 10px;
  padding-bottom: 6px;
  border-bottom: 2px solid #d1fae5;
  color: #166534;
}

.article-body h4 {
  font-size: 1rem;
  font-weight: 700;
  margin: 20px 0 8px;
  color: #1f2937;
}

.article-body p { margin-bottom: 16px; }

.article-body ul,
.article-body ol {
  margin: 12px 0 16px 24px;
}

.article-body li { margin-bottom: 6px; }

.article-body strong { color: #111827; }

.article-body hr {
  border: none;
  border-top: 1px solid #e5e7eb;
  margin: 32px 0;
}

.article-body small { color: #6b7280; }

/* ── テーブル ── */
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: .92rem;
  overflow-x: auto;
  display: block;
}

.article-body table thead th {
  background: #15803d;
  color: #fff;
  padding: 10px 14px;
  text-align: left;
  font-weight: 700;
  white-space: nowrap;
}

.article-body table tbody td {
  padding: 10px 14px;
  border-bottom: 1px solid #e5e7eb;
  vertical-align: top;
}

.article-body table tbody tr:nth-child(even) td {
  background: #f9fafb;
}

/* ── info-box ── */
.info-box {
  border-radius: 8px;
  padding: 16px 20px;
  margin: 20px 0;
  font-size: .95rem;
}

.info-box strong:first-child {
  display: block;
  margin-bottom: 8px;
  font-size: 1rem;
}

.info-box.point {
  background: #f0fdf4;
  border: 1px solid #86efac;
  border-left: 5px solid #16a34a;
}
.info-box.point strong:first-child { color: #15803d; }

.info-box.caution {
  background: #fff7ed;
  border: 1px solid #fed7aa;
  border-left: 5px solid #ea580c;
}
.info-box.caution strong:first-child { color: #c2410c; }

.info-box.merit {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-left: 5px solid #2563eb;
}
.info-box.merit strong:first-child { color: #1d4ed8; }

/* ── ランキングカード ── */
.card-ranking-box {
  border-radius: 8px;
  padding: 18px 20px;
  margin: 16px 0;
  border: 1px solid #e5e7eb;
  border-top: 4px solid;
}

.card-ranking-box.rank-1 { border-top-color: #eab308; background: #fefce8; }
.card-ranking-box.rank-2 { border-top-color: #9ca3af; background: #f9fafb; }
.card-ranking-box.rank-3 { border-top-color: #b45309; background: #fffbeb; }

/* ── バッジ ── */
.rate-badge {
  display: inline-block;
  background: #15803d;
  color: #fff;
  font-size: .75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  margin-right: 6px;
}

/* ── フッター ── */
.site-footer {
  background: #1f2937;
  color: #d1d5db;
  padding: 28px 0;
  font-size: .88rem;
  margin-top: 60px;
}

.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.site-footer a { color: #9ca3af; }
.site-footer a:hover { color: #fff; }

/* ── インデックスページ ── */
.index-hero {
  background: linear-gradient(135deg, #14532d 0%, #15803d 100%);
  color: #fff;
  padding: 48px 0;
  margin-bottom: 36px;
}

.index-hero h1 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.index-hero p {
  font-size: 1.05rem;
  color: #d1fae5;
  margin: 0;
}

.category-label {
  display: inline-block;
  font-size: .75rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 20px;
  background: #d1fae5;
  color: #14532d;
  margin-bottom: 8px;
}

.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin: 28px 0;
}

.article-card {
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 20px;
  transition: box-shadow .15s, transform .15s;
  background: #fff;
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  box-shadow: 0 4px 20px rgba(0,0,0,.1);
  transform: translateY(-2px);
}

.article-card h2 {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 10px;
  line-height: 1.5;
  color: #111827;
  flex-grow: 1;
  border: none;
  background: none;
  padding: 0;
}

.article-card h2 a { color: inherit; }
.article-card h2 a:hover { color: #15803d; text-decoration: none; }

.article-card p {
  font-size: .875rem;
  color: #4b5563;
  line-height: 1.6;
  margin: 0 0 12px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-date {
  font-size: .78rem;
  color: #9ca3af;
  margin-top: auto;
}

.section-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: #111827;
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #16a34a;
}

/* ── レスポンシブ ── */
@media (max-width: 640px) {
  .site-header .container { gap: 10px; }
  .site-nav ul { gap: 2px; }
  .site-nav a { font-size: .78rem; padding: 4px 7px; }

  .article-body h1 { font-size: 1.35rem; }
  .article-body h2 { font-size: 1.15rem; }

  main.container { padding-top: 24px; }

  .index-hero { padding: 32px 0; }
  .index-hero h1 { font-size: 1.4rem; }

  .site-footer .container { flex-direction: column; text-align: center; }
}