:root {
  --bg: #ffffff;
  --bg-alt: #f5f7fa;
  --text: #1c2230;
  --text-muted: #5b6472;
  --accent: #1f6f78;
  --accent-strong: #14505a;
  --border: #e3e7ec;
  --card-bg: #ffffff;
  --code-bg: #eef2f5;
  --disclosure-bg: #fff8e6;
  --disclosure-border: #f0d78c;
  --max-width: 780px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181f;
    --bg-alt: #1b212b;
    --text: #e7ebf0;
    --text-muted: #a2acb9;
    --accent: #5fc2cc;
    --accent-strong: #8adde5;
    --border: #2a323d;
    --card-bg: #1b212b;
    --code-bg: #232b36;
    --disclosure-bg: #2a2410;
    --disclosure-border: #5c4d1a;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Yu Gothic", "Noto Sans JP", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.85;
  font-size: 16px;
}

a { color: var(--accent-strong); text-decoration: none; }
a:hover { text-decoration: underline; }

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

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

header.site-header {
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
  background: var(--bg);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.brand {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
}
.brand span.dot { color: var(--accent); }

nav.site-nav ul {
  list-style: none;
  display: flex;
  gap: 16px;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}
nav.site-nav a { color: var(--text-muted); font-size: 0.92rem; }
nav.site-nav a:hover { color: var(--accent-strong); }

main { padding: 32px 0 60px; }

.hero {
  padding: 28px 0 8px;
}
.hero h1 { font-size: 1.6rem; margin: 0 0 6px; }
.hero p { color: var(--text-muted); margin: 0; }

.breadcrumb {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 18px;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb .sep { margin: 0 6px; }

h2.section-title {
  font-size: 1.05rem;
  border-left: 4px solid var(--accent);
  padding-left: 10px;
  margin: 36px 0 16px;
}

.card-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
  background: var(--card-bg);
  transition: border-color .15s ease;
}
.card:hover { border-color: var(--accent); }
.card .meta { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 6px; }
.card .cat-tag {
  display: inline-block;
  background: var(--bg-alt);
  color: var(--accent-strong);
  border-radius: 4px;
  padding: 1px 8px;
  font-size: 0.74rem;
  margin-right: 6px;
}
.card h3 { margin: 4px 0 6px; font-size: 1.08rem; line-height: 1.5; }
.card h3 a { color: var(--text); }
.card p.desc { margin: 0; color: var(--text-muted); font-size: 0.9rem; }

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin: 16px 0 8px;
}
.category-grid a.cat-card {
  display: block;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  background: var(--bg-alt);
  color: var(--text);
}
.category-grid a.cat-card:hover { border-color: var(--accent); text-decoration: none; }
.category-grid .cat-card strong { display: block; margin-bottom: 4px; color: var(--accent-strong); }
.category-grid .cat-card span { font-size: 0.84rem; color: var(--text-muted); }

article.post h1 { font-size: 1.55rem; line-height: 1.5; margin: 4px 0 10px; }
.post-meta {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.post-tags { margin: 8px 0 20px; }
.post-tags a {
  display: inline-block;
  font-size: 0.76rem;
  background: var(--bg-alt);
  color: var(--text-muted);
  border-radius: 4px;
  padding: 2px 8px;
  margin: 0 6px 6px 0;
}

.disclosure {
  background: var(--disclosure-bg);
  border: 1px solid var(--disclosure-border);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.85rem;
  margin: 18px 0 22px;
  color: var(--text);
}

.post-body h2 { font-size: 1.25rem; margin: 34px 0 12px; }
.post-body h3 { font-size: 1.08rem; margin: 26px 0 10px; }
.post-body p { margin: 0 0 16px; }
.post-body ul, .post-body ol { margin: 0 0 16px; padding-left: 1.4em; }
.post-body li { margin-bottom: 6px; }
.post-body pre {
  background: var(--code-bg);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 0.85rem;
  margin: 0 0 18px;
}
.post-body code {
  background: var(--code-bg);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.88em;
}
.post-body pre code { background: none; padding: 0; }
.post-body blockquote {
  border-left: 3px solid var(--accent);
  margin: 0 0 18px;
  padding: 4px 0 4px 14px;
  color: var(--text-muted);
}
.post-body strong { color: var(--text); }

.cta-box {
  border: 1px solid var(--accent);
  background: var(--bg-alt);
  border-radius: 10px;
  padding: 18px 20px;
  margin: 26px 0;
}
.cta-box .cta-label {
  font-size: 0.74rem;
  color: var(--accent-strong);
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: .05em;
}
.cta-box p { margin: 0 0 10px; }
.cta-box .btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 9px 18px;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
}
.cta-box .btn:hover { background: var(--accent-strong); text-decoration: none; }
.cta-box .fine-print { font-size: 0.72rem; color: var(--text-muted); margin-top: 8px; }

.related {
  margin-top: 40px;
  border-top: 1px solid var(--border);
  padding-top: 20px;
}

footer.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0 40px;
  color: var(--text-muted);
  font-size: 0.8rem;
}
footer.site-footer nav { margin-bottom: 10px; }
footer.site-footer nav a { color: var(--text-muted); margin-right: 14px; }
footer.site-footer .affiliate-line { margin-top: 10px; line-height: 1.7; }

.static-page h1 { font-size: 1.5rem; margin-bottom: 18px; }
.static-page h2 { font-size: 1.15rem; margin: 26px 0 10px; }
.static-page p { margin: 0 0 14px; }
.static-page ul { padding-left: 1.4em; margin: 0 0 14px; }

@media (max-width: 480px) {
  body { font-size: 15.5px; }
  .hero h1 { font-size: 1.35rem; }
  article.post h1 { font-size: 1.3rem; }
}

/* ---- 無料ツール共通 ---- */
.tool-lead { color: var(--text-muted); margin: 0 0 24px; }
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin: 16px 0 8px;
}
.tool-grid a.tool-card {
  display: block;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  background: var(--card-bg);
  color: var(--text);
}
.tool-grid a.tool-card:hover { border-color: var(--accent); text-decoration: none; }
.tool-grid .tool-card strong { display: block; margin-bottom: 6px; color: var(--accent-strong); font-size: 1.05rem; }
.tool-grid .tool-card span { font-size: 0.86rem; color: var(--text-muted); }

.tool-panel {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  background: var(--card-bg);
  margin: 20px 0 28px;
}
.tool-panel h2 { margin-top: 0; font-size: 1.1rem; }

.form-row { margin-bottom: 16px; }
.form-row label {
  display: block;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.form-row .hint { font-size: 0.76rem; color: var(--text-muted); margin-top: 4px; }
.form-row select,
.form-row input[type="text"],
.form-row textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 0.94rem;
  font-family: inherit;
  background: var(--bg);
  color: var(--text);
}
.form-row textarea { resize: vertical; min-height: 90px; }
.form-row select { -webkit-appearance: menulist; }

.tool-btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 11px 22px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
}
.tool-btn:hover { background: var(--accent-strong); }
.tool-btn.secondary {
  background: var(--bg-alt);
  color: var(--accent-strong);
  border: 1px solid var(--border);
  font-weight: 600;
  padding: 8px 16px;
  font-size: 0.85rem;
}

.tool-output-wrap { margin-top: 18px; }
.tool-output {
  width: 100%;
  min-height: 160px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 0.92rem;
  line-height: 1.8;
  background: var(--bg-alt);
  color: var(--text);
  white-space: pre-wrap;
  font-family: inherit;
}
.tool-output-actions { margin-top: 10px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.copy-status { font-size: 0.8rem; color: var(--accent-strong); }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
  margin: 18px 0;
}
.stat-tile {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  background: var(--bg-alt);
  text-align: center;
}
.stat-tile .num { font-size: 1.5rem; font-weight: 700; color: var(--accent-strong); line-height: 1.3; }
.stat-tile .label { font-size: 0.76rem; color: var(--text-muted); margin-top: 2px; }

.limit-list { display: flex; flex-direction: column; gap: 10px; margin: 18px 0; }
.limit-row {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  background: var(--card-bg);
}
.limit-row .limit-head { display: flex; justify-content: space-between; font-size: 0.86rem; margin-bottom: 6px; }
.limit-row .limit-head .name { font-weight: 700; }
.limit-bar { height: 8px; border-radius: 4px; background: var(--bg-alt); overflow: hidden; }
.limit-bar > div { height: 100%; background: var(--accent); transition: width .15s ease; }
.limit-row.over .limit-bar > div { background: #d0453b; }
.limit-row.over .limit-head .status { color: #d0453b; font-weight: 700; }

.shindan-q { border-bottom: 1px solid var(--border); padding: 16px 0; }
.shindan-q:last-child { border-bottom: none; }
.shindan-q .q-text { font-weight: 700; margin-bottom: 10px; font-size: 0.95rem; }
.shindan-q .q-opts { display: flex; flex-direction: column; gap: 8px; }
.shindan-q label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 400;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 12px;
  cursor: pointer;
}
.shindan-q input[type="radio"] { accent-color: var(--accent); }

.shindan-result {
  border: 1px solid var(--accent);
  border-radius: 10px;
  padding: 20px;
  background: var(--bg-alt);
  margin-top: 20px;
}
.shindan-result .type-name { font-size: 1.25rem; font-weight: 700; color: var(--accent-strong); margin: 0 0 8px; }
.shindan-result .type-desc { margin: 0 0 14px; }
.shindan-result .type-advice { margin: 0 0 14px; }
.shindan-result .related-links { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 14px; }
.shindan-result .related-links a {
  display: inline-block;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 0.84rem;
  color: var(--accent-strong);
}
.share-x {
  display: inline-block;
  background: #14181f;
  color: #fff !important;
  border-radius: 6px;
  padding: 8px 16px;
  font-size: 0.86rem;
  font-weight: 600;
}
.share-x:hover { background: #2a323d; text-decoration: none !important; }

.tool-disclaimer {
  font-size: 0.78rem;
  color: var(--text-muted);
  background: var(--bg-alt);
  border-radius: 8px;
  padding: 10px 14px;
  margin: 0 0 20px;
}

.promo-box { margin-top: 40px; }
.promo-box .promo-items { display: flex; flex-wrap: wrap; gap: 10px; margin: 10px 0; }