/* ===========================================================
   LE CIEL WEB DESIGN — Blog shared styles
   本家 index.html のトーン（カラー・フォント・nav・footer）を踏襲
   =========================================================== */
:root {
  --font-jp: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", YuGothic, Meiryo, sans-serif;
  --primary: #2563eb;
  --primary-dark: #1e3a8a;
  --primary-light: #eff6ff;
  --accent: #047857;
  --accent-light: #ecfdf5;
  --navy: #0f172a;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --bg: #f8fafc;
  --white: #ffffff;
  --gradient: linear-gradient(135deg, #f97316, #ec4899, #8b5cf6, #3b82f6);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scrollbar-gutter: stable; }
body {
  font-family: var(--font-jp);
  font-size: 17px;
  line-height: 1.8;
  color: var(--text);
  background: var(--white);
}
img { max-width: 100%; height: auto; display: block; }

/* ===== NAV（本家と同一） ===== */
/* ※ body 直下のトップナビだけに限定。記事内の <nav class="toc"> や
   <nav class="breadcrumb"> に sticky が誤適用されるのを防ぐ */
body > nav {
  position: sticky; top: 0;
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  z-index: 100; padding: 0 24px;
}
.nav-inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.logo { display: flex; align-items: center; gap: 12px; line-height: 1; text-decoration: none; }
.logo-mark {
  width: 38px; height: 38px; flex-shrink: 0; display: block; border-radius: 50%;
  background: conic-gradient(from 0deg,#ef4444 0%,#f97316 14%,#eab308 28%,#22c55e 43%,#06b6d4 57%,#3b82f6 71%,#a855f7 86%,#ef4444 100%);
  -webkit-mask: radial-gradient(circle, transparent 34%, #000 35%, #000 100%);
          mask: radial-gradient(circle, transparent 34%, #000 35%, #000 100%);
}
.logo-text { display: flex; flex-direction: column; gap: 4px; white-space: nowrap; }
.logo-main { font-size: 18px; font-weight: 700; letter-spacing: 0.08em; color: var(--navy); }
.logo-sub { font-size: 11px; letter-spacing: 0.1em; color: var(--text-muted); font-weight: 500; }
.nav-links { display: flex; gap: 32px; list-style: none; }
.nav-links a { font-size: 15px; color: var(--text-muted); text-decoration: none; font-weight: 500; transition: color 0.2s; }
.nav-links a:hover { color: var(--primary); }
.nav-cta {
  background: var(--primary); color: var(--white) !important; padding: 10px 22px; border-radius: 6px;
  font-size: 15px !important; font-weight: 600 !important; transition: background 0.2s !important;
}
.nav-cta:hover { background: var(--primary-dark) !important; color: var(--white) !important; }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.hamburger span { display: block; width: 26px; height: 2px; background: var(--navy); border-radius: 2px; transition: all 0.3s; }

@media (max-width: 640px) {
  .logo-mark { width: 32px; height: 32px; }
  .logo-main { font-size: 14px; letter-spacing: 0.06em; }
  .logo-sub { font-size: 10px; }
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 24px;
    gap: 20px;
    z-index: 99;
  }
  .nav-links.open .nav-cta { text-align: center; display: block; padding: 14px; }
}

/* ===== レイアウト ===== */
.container { max-width: 760px; margin: 0 auto; padding: 0 24px; }
.container-wide { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* ===== パンくず ===== */
.breadcrumb { font-size: 13px; color: var(--text-muted); padding: 20px 0 0; }
.breadcrumb ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 0; }
.breadcrumb a { color: var(--primary); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb li:not(:last-child)::after { content: "›"; margin-left: 6px; color: #cbd5e1; }

/* ===== 記事ヘッダー ===== */
.article-head { padding: 24px 0 8px; }
.article-cat {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .05em;
  color: var(--primary); background: var(--primary-light); padding: 4px 12px; border-radius: 999px;
}
.article-title {
  font-size: clamp(26px, 5.2vw, 38px); line-height: 1.4; font-weight: 800;
  color: var(--navy); margin: 16px 0 12px; letter-spacing: .01em;
}
.article-meta { font-size: 13px; color: var(--text-muted); display: flex; gap: 16px; flex-wrap: wrap; }
.article-hero { margin: 24px 0 8px; border-radius: 14px; overflow: hidden; aspect-ratio: 16/9; }
.article-hero img { width: 100%; height: 100%; object-fit: cover; }

/* ===== 目次 ===== */
.toc {
  background: var(--bg); border: 1px solid var(--border); border-radius: 12px;
  padding: 20px 24px; margin: 28px 0;
}
.toc-title { font-size: 14px; font-weight: 700; color: var(--navy); margin-bottom: 12px; letter-spacing: .04em; }
.toc ol { margin: 0; padding-left: 1.2em; }
.toc li { margin: 6px 0; }
.toc a { color: var(--text); text-decoration: none; font-size: 15px; }
.toc a:hover { color: var(--primary); text-decoration: underline; }

/* ===== 本文タイポgrafi ===== */
.article-body { font-size: 17px; line-height: 1.95; color: var(--text); }
.article-body > * { scroll-margin-top: 84px; }
.article-body h2 {
  font-size: clamp(21px, 4.4vw, 27px); line-height: 1.45; font-weight: 800; color: var(--navy);
  margin: 56px 0 18px; padding-bottom: 12px; border-bottom: 2px solid var(--border); position: relative;
}
.article-body h2::before {
  content: ""; position: absolute; bottom: -2px; left: 0; width: 56px; height: 2px; background: var(--gradient);
}
.article-body h3 { font-size: clamp(18px, 3.6vw, 21px); font-weight: 700; color: var(--navy); margin: 36px 0 12px; }
.article-body p { margin: 0 0 18px; }
.article-body a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }
.article-body ul, .article-body ol { margin: 0 0 20px; padding-left: 1.4em; }
.article-body li { margin: 8px 0; }
.article-body strong { color: var(--navy); font-weight: 700; }
.article-body img { border-radius: 12px; margin: 24px 0; }

/* リード文 */
.lead { font-size: 18px; line-height: 1.9; color: var(--text); background: var(--accent-light);
  border-left: 4px solid var(--accent); padding: 18px 22px; border-radius: 0 10px 10px 0; margin: 8px 0 0; }

/* 表 */
.table-wrap { overflow-x: auto; margin: 0 0 24px; -webkit-overflow-scrolling: touch; }
.article-body table { border-collapse: collapse; width: 100%; font-size: 15px; min-width: 460px; }
.article-body th, .article-body td { border: 1px solid var(--border); padding: 12px 14px; text-align: left; }
.article-body th { background: var(--primary-light); color: var(--navy); font-weight: 700; white-space: nowrap; }
.article-body tbody tr:nth-child(even) { background: var(--bg); }

/* コードブロック */
.article-body pre {
  background: #0f172a; color: #e2e8f0; border-radius: 10px; padding: 18px 20px;
  overflow-x: auto; font-size: 13.5px; line-height: 1.7; margin: 0 0 24px;
  -webkit-overflow-scrolling: touch;
  font-family: "SFMono-Regular", ui-monospace, Menlo, Consolas, "Courier New", monospace;
}
.article-body pre code { color: inherit; background: none; padding: 0; font-size: inherit; white-space: pre; }
.article-body code {
  background: var(--bg); border: 1px solid var(--border); border-radius: 5px;
  padding: 1px 6px; font-size: 14px; color: var(--primary-dark);
  font-family: "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
}
.code-label { font-size: 12px; font-weight: 700; color: var(--text-muted); margin: 24px 0 8px; letter-spacing: .03em; }

/* PageSpeedスクリーンショット */
.ps-shot { margin: 24px 0 8px; }
.ps-shot img {
  width: 100%; height: auto; display: block;
  border: 1px solid var(--border); border-radius: 12px;
  box-shadow: 0 8px 28px rgba(15,23,42,.08);
}
.ps-shot figcaption { font-size: 13px; color: var(--text-muted); text-align: center; margin-top: 10px; }

/* スコアバッジ */
.score-badges { display: flex; flex-wrap: wrap; gap: 10px; margin: 24px 0; }
.score-badge { display: flex; flex-direction: column; align-items: center; gap: 4px;
  border: 2px solid #22c55e; border-radius: 12px; padding: 12px 18px; min-width: 92px; }
.score-badge .num { font-size: 28px; font-weight: 800; color: #16a34a; line-height: 1; }
.score-badge .lbl { font-size: 12px; color: var(--text-muted); font-weight: 600; }

/* チェックリスト */
.checklist { list-style: none; padding: 0; margin: 0 0 24px; }
.checklist li { position: relative; padding-left: 30px; margin: 10px 0; }
.checklist li::before { content: "✓"; position: absolute; left: 0; top: 0; color: #16a34a; font-weight: 800; }

/* ポイントボックス */
.note { background: var(--primary-light); border-radius: 12px; padding: 18px 22px; margin: 24px 0; font-size: 15.5px; }
.note-title { font-weight: 700; color: var(--primary-dark); margin-bottom: 6px; }

/* ===== FAQ ===== */
.faq-section { margin: 56px 0 0; }
.faq-item { border: 1px solid var(--border); border-radius: 12px; margin-bottom: 12px; overflow: hidden; }
.faq-q { width: 100%; text-align: left; background: #fff; border: 0; cursor: pointer;
  padding: 18px 20px; font-size: 16px; font-weight: 700; color: var(--navy);
  display: flex; justify-content: space-between; gap: 12px; align-items: center; font-family: inherit; }
.faq-icon { color: var(--primary); font-size: 22px; flex-shrink: 0; transition: transform .25s; }
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease, padding .3s ease;
  padding: 0 20px; font-size: 15.5px; color: var(--text); }
.faq-item.open .faq-a { max-height: 500px; padding: 0 20px 18px; }

/* ===== 記事内CTA ===== */
.cta-box {
  background: var(--navy); color: #fff; border-radius: 16px; padding: 40px 32px; text-align: center;
  margin: 64px 0 0;
}
.cta-box h3 { color: #fff; font-size: clamp(20px, 4.4vw, 25px); margin-bottom: 12px; }
.cta-box p { color: rgba(255,255,255,.72); font-size: 15.5px; margin-bottom: 24px; }
.btn-primary {
  display: inline-block; background: var(--gradient); background-size: 200% 200%; color: #fff;
  padding: 16px 38px; border-radius: 999px; font-weight: 700; font-size: 16px; text-decoration: none;
  box-shadow: 0 8px 24px rgba(139,92,246,.35); transition: transform .2s, box-shadow .2s; border: 0; cursor: pointer;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(139,92,246,.45); }
.cta-note { font-size: 13px; color: rgba(255,255,255,.55); margin-top: 14px; }

/* ===== SNSシェア ===== */
.share-bar { margin: 56px 0 0; padding: 26px 24px; border-radius: 18px;
  background: linear-gradient(180deg, #fff, var(--bg));
  border: 1px solid var(--border); box-shadow: 0 6px 22px rgba(15,23,42,.05); }
.share-label { display: block; text-align: center; font-size: 13px; font-weight: 700;
  letter-spacing: .12em; color: var(--text-muted); margin-bottom: 18px; }
.share-btns { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
.share-btn {
  --c: var(--primary);
  display: inline-flex; align-items: center; gap: 9px;
  min-height: 50px; padding: 0 22px; border: 0; border-radius: 999px;
  font-family: inherit; font-size: 15px; font-weight: 700; line-height: 1; cursor: pointer;
  color: #fff; background: var(--c); text-decoration: none;
  box-shadow: 0 6px 16px -4px color-mix(in srgb, var(--c) 55%, transparent);
  transition: transform .18s cubic-bezier(.34,1.56,.64,1), box-shadow .18s, filter .18s;
  -webkit-tap-highlight-color: transparent; touch-action: manipulation;
}
.share-btn svg { width: 20px; height: 20px; flex-shrink: 0; }
.share-btn:hover { transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 24px -6px color-mix(in srgb, var(--c) 60%, transparent); filter: saturate(1.08); }
.share-btn:active { transform: translateY(-1px) scale(.97); }
.share-btn:focus-visible { outline: 3px solid color-mix(in srgb, var(--c) 45%, transparent); outline-offset: 3px; }
.share-x      { --c: #111827; }
.share-line   { --c: #06c755; }
.share-fb     { --c: #1877f2; }
.share-hatena { --c: #00a4de; }
.share-copy   { --c: #475569; }
.share-copy.copied { --c: var(--accent); }
.share-copy.copied svg { display: none; }
@media (max-width: 480px) {
  .share-bar { padding: 22px 16px; }
  .share-btn { font-size: 14px; min-height: 48px; padding: 0 16px; gap: 7px; flex: 1 1 calc(50% - 12px); justify-content: center; }
}

/* ===== 関連記事 ===== */
.related { margin: 64px 0 0; }
.related-title { font-size: 20px; font-weight: 800; color: var(--navy); margin-bottom: 20px; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 18px; }
.related-card { border: 1px solid var(--border); border-radius: 12px; overflow: hidden; text-decoration: none;
  color: var(--text); transition: transform .2s, box-shadow .2s; background: #fff; }
.related-card:hover { transform: translateY(-3px); box-shadow: 0 10px 28px rgba(15,23,42,.08); }
.related-thumb { aspect-ratio: 16/9; background: var(--primary-light); }
.related-thumb img { width: 100%; height: 100%; object-fit: cover; }
.related-body { padding: 14px 16px; }
.related-cat { font-size: 11px; font-weight: 700; color: var(--primary); }
.related-card h4 { font-size: 15px; line-height: 1.5; color: var(--navy); margin-top: 4px; font-weight: 700; }

/* ===== ブログ一覧（hub） ===== */
@keyframes heroRainbow {
  0%   { background-position: 0% 0%; }
  25%  { background-position: 100% 0%; }
  50%  { background-position: 100% 100%; }
  75%  { background-position: 0% 100%; }
  100% { background-position: 0% 0%; }
}
.blog-hero {
  background: linear-gradient(
    125deg,
    #aed4fe, #d0cafd, #f0c2fd, #f9bede, #feca96, #fde878, #a9f4c5, #8eedfb, #aed4fe
  );
  background-size: 400% 400%;
  animation: heroRainbow 6s ease infinite;
  padding: 64px 24px; text-align: center;
}
.blog-hero h1 { font-size: clamp(26px, 5vw, 36px); color: var(--navy); font-weight: 800; }
.blog-hero p { color: var(--text); margin-top: 12px; font-size: 16px; }
@media (prefers-reduced-motion: reduce) { .blog-hero { animation: none; } }
.post-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; padding: 48px 0 32px; }

/* ===== ページャー ===== */
.pager { display: flex; justify-content: center; align-items: center; gap: 8px; flex-wrap: wrap; padding: 8px 0 80px; }
.pager a, .pager .page-num { min-width: 44px; height: 44px; padding: 0 12px; display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--border); border-radius: 12px; background: #fff; color: var(--text);
  font-weight: 700; font-size: 15px; text-decoration: none; transition: transform .15s, box-shadow .15s, border-color .15s, color .15s; }
.pager a:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); box-shadow: 0 6px 16px rgba(37,99,235,.15); }
.pager .current { background: var(--gradient); color: #fff; border: 0; box-shadow: 0 6px 16px rgba(139,92,246,.3); }
.pager .disabled { opacity: .4; pointer-events: none; }
@media (max-width: 480px) {
  .pager a, .pager .page-num { min-width: 40px; height: 40px; font-size: 14px; padding: 0 9px; }
}
.post-card { border: 1px solid var(--border); border-radius: 14px; overflow: hidden; text-decoration: none;
  color: var(--text); background: #fff; transition: transform .2s, box-shadow .2s; display: flex; flex-direction: column; }
.post-card:hover { transform: translateY(-4px); box-shadow: 0 14px 36px rgba(15,23,42,.1); }
.post-thumb { aspect-ratio: 16/9; position: relative; overflow: hidden;
  background:
    radial-gradient(120% 120% at 12% 18%, rgba(239,68,68,.55) 0%, rgba(239,68,68,0) 45%),
    radial-gradient(120% 120% at 82% 16%, rgba(249,115,22,.50) 0%, rgba(249,115,22,0) 48%),
    radial-gradient(130% 130% at 88% 88%, rgba(34,197,94,.50) 0%, rgba(34,197,94,0) 50%),
    radial-gradient(130% 130% at 18% 92%, rgba(168,85,247,.55) 0%, rgba(168,85,247,0) 50%),
    radial-gradient(150% 150% at 55% 55%, rgba(6,182,212,.45) 0%, rgba(6,182,212,0) 55%),
    linear-gradient(135deg, #eab308 0%, #06b6d4 50%, #a855f7 100%);
  filter: saturate(1.05); }
.post-thumb img { width: 100%; height: 100%; object-fit: cover; position: relative; z-index: 1; }
/* カードごとに色味を少しずつ変える */
.post-card:nth-of-type(2) .post-thumb { filter: saturate(1.05) hue-rotate(40deg); }
.post-card:nth-of-type(3) .post-thumb { filter: saturate(1.05) hue-rotate(90deg); }
.post-card:nth-of-type(4) .post-thumb { filter: saturate(1.05) hue-rotate(160deg); }
.post-card:nth-of-type(5) .post-thumb { filter: saturate(1.05) hue-rotate(220deg); }
.post-card:nth-of-type(6) .post-thumb { filter: saturate(1.05) hue-rotate(280deg); }
.post-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.post-cat { font-size: 11px; font-weight: 700; color: var(--primary); background: var(--primary-light);
  align-self: flex-start; padding: 3px 10px; border-radius: 999px; }
.post-card h2 { font-size: 18px; line-height: 1.5; color: var(--navy); font-weight: 700; margin: 12px 0 8px; }
.post-card .excerpt { font-size: 14px; color: var(--text-muted); line-height: 1.7; flex: 1; }
.post-date { font-size: 12px; color: var(--text-muted); margin-top: 14px; }

/* ===== FOOTER（本家と同一） ===== */
footer { background: var(--navy); color: #fff; text-align: center; padding: 56px 24px 40px; }
.footer-brand { display: flex; align-items: center; justify-content: center; gap: 12px; margin-bottom: 24px; }
.footer-mark { width: 32px; height: 32px; display: inline-block; border-radius: 50%;
  background: conic-gradient(from 0deg,#ef4444 0%,#f97316 14%,#eab308 28%,#22c55e 43%,#06b6d4 57%,#3b82f6 71%,#a855f7 86%,#ef4444 100%);
  -webkit-mask: radial-gradient(circle,transparent 34%,#000 35%,#000 100%);
          mask: radial-gradient(circle,transparent 34%,#000 35%,#000 100%); }
.footer-brand .ft-main { font-size: 16px; font-weight: 700; letter-spacing: .08em; color: rgba(255,255,255,.9); margin: 0; }
.footer-brand .ft-sub { font-size: 11px; letter-spacing: .1em; color: rgba(255,255,255,.5); margin: 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: 24px; justify-content: center; margin-bottom: 24px; }
.footer-links a { color: rgba(255,255,255,.7); text-decoration: none; font-size: 14px; }
.footer-links a:hover { color: #fff; }
footer > p { font-size: 12px; color: rgba(255,255,255,.45); }

@media (max-width: 640px) {
  body { font-size: 16px; }
  .article-body { font-size: 16px; line-height: 1.9; }
  .cta-box { padding: 32px 22px; }
  .toc { padding: 18px 20px; }
}