/* Expert Advise — GitHub Pages 共通スタイル */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --bg-card: #ffffff;
  --fg: #1f2328;
  --fg-muted: #59636e;
  --border: #d1d9e0;
  --accent: #1565c0;
  --accent-soft: #e3f0ff;
  --good: #1b7f4b;
  --good-soft: #e6f4ec;
  --bad: #b3261e;
  --bad-soft: #fdecea;
  --warn-soft: #fff6e0;
  --warn-border: #e8b93b;
  --code-bg: #f6f8fa;
  --shadow: 0 1px 3px rgba(31, 35, 40, 0.08);
  --maxw: 860px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --bg-soft: #161b22;
    --bg-card: #161b22;
    --fg: #e6edf3;
    --fg-muted: #9198a1;
    --border: #30363d;
    --accent: #6cb1ff;
    --accent-soft: #14273f;
    --good: #58d68d;
    --good-soft: #12261a;
    --bad: #ff8a80;
    --bad-soft: #2c1512;
    --warn-soft: #2b2312;
    --warn-border: #9c7b1f;
    --code-bg: #161b22;
    --shadow: none;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.85;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

/* ---------------- ヘッダ / ナビ ---------------- */

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg-soft);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(6px);
}

.site-header .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.6rem 1.1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1.1rem;
}

.site-header .brand {
  font-weight: 700;
  color: var(--fg);
  text-decoration: none;
  font-size: 0.98rem;
  white-space: nowrap;
}

.site-header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  font-size: 0.9rem;
}

.site-header nav a {
  color: var(--fg-muted);
  text-decoration: none;
  padding: 0.15rem 0;
  border-bottom: 2px solid transparent;
}

.site-header nav a:hover { color: var(--accent); }
.site-header nav a[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

/* ---------------- レイアウト ---------------- */

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem 1.1rem 5rem;
}

h1 {
  font-size: 1.9rem;
  line-height: 1.4;
  margin: 0.4rem 0 0.6rem;
  letter-spacing: 0.01em;
}

h2 {
  font-size: 1.35rem;
  margin: 3rem 0 0.9rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: 4rem;
}

h3 {
  font-size: 1.1rem;
  margin: 2rem 0 0.6rem;
  scroll-margin-top: 4rem;
}

p { margin: 0.9rem 0; }

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

.lede {
  font-size: 1.05rem;
  color: var(--fg-muted);
  margin-bottom: 1.6rem;
}

ul, ol { padding-left: 1.4rem; }
li { margin: 0.35rem 0; }

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 3rem 0;
}

/* ---------------- 図 ---------------- */

figure {
  margin: 1.6rem 0;
  padding: 0;
}

figure img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
}

figcaption {
  font-size: 0.86rem;
  color: var(--fg-muted);
  margin-top: 0.55rem;
  line-height: 1.7;
}

.svg-figure {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.8rem;
  overflow-x: auto;
}

.svg-figure svg { display: block; margin: 0 auto; max-width: 100%; height: auto; }

/* ---------------- 表 ---------------- */

.table-wrap {
  overflow-x: auto;
  margin: 1.4rem 0;
  border: 1px solid var(--border);
  border-radius: 8px;
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.9rem;
  min-width: 480px;
}

caption {
  caption-side: top;
  text-align: left;
  font-size: 0.86rem;
  color: var(--fg-muted);
  padding: 0.7rem 0.9rem 0.4rem;
}

th, td {
  padding: 0.5rem 0.8rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  white-space: nowrap;
}

thead th {
  background: var(--bg-soft);
  font-weight: 600;
  position: sticky;
  top: 0;
}

tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--bg-soft); }

td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

.win { color: var(--good); font-weight: 600; }
.lose { color: var(--fg-muted); }
.row-highlight { background: var(--good-soft); }
.row-highlight:hover { background: var(--good-soft); }

/* ---------------- 補助ブロック ---------------- */

.callout {
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  padding: 0.9rem 1.1rem;
  border-radius: 0 8px 8px 0;
  margin: 1.5rem 0;
}

.callout.good { border-left-color: var(--good); background: var(--good-soft); }
.callout.bad { border-left-color: var(--bad); background: var(--bad-soft); }
.callout.warn { border-left-color: var(--warn-border); background: var(--warn-soft); }
.callout p:first-child { margin-top: 0; }
.callout p:last-child { margin-bottom: 0; }
.callout .label {
  display: block;
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  margin-bottom: 0.3rem;
  text-transform: uppercase;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.1rem 1.2rem;
  background: var(--bg-card);
  box-shadow: var(--shadow);
  text-decoration: none;
  color: inherit;
  display: block;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card h3 { margin: 0 0 0.4rem; font-size: 1.02rem; color: var(--accent); }
.card p { margin: 0; font-size: 0.88rem; color: var(--fg-muted); line-height: 1.7; }

.keypoints {
  list-style: none;
  padding: 0;
  margin: 1.6rem 0;
  counter-reset: kp;
}

.keypoints li {
  position: relative;
  padding: 0.7rem 0.9rem 0.7rem 3rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 0.7rem;
  background: var(--bg-card);
}

.keypoints li::before {
  counter-increment: kp;
  content: counter(kp);
  position: absolute;
  left: 0.9rem;
  top: 0.75rem;
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
  display: grid;
  place-items: center;
  line-height: 1;
}

code, kbd, pre {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

code {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0.08em 0.35em;
  font-size: 0.87em;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.65;
}

pre code { background: none; border: none; padding: 0; font-size: inherit; }

.term {
  border-bottom: 1px dotted var(--fg-muted);
  cursor: help;
  font-weight: 600;
}

details {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.7rem 1rem;
  margin: 1.3rem 0;
  background: var(--bg-soft);
}

summary { cursor: pointer; font-weight: 600; font-size: 0.94rem; }
details[open] summary { margin-bottom: 0.6rem; }

.footnote { font-size: 0.86rem; color: var(--fg-muted); }

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.6rem 1.1rem 3rem;
  font-size: 0.85rem;
  color: var(--fg-muted);
}

.site-footer .inner { max-width: var(--maxw); margin: 0 auto; }

/* 数式が横に溢れたときにスクロールさせる */
mjx-container[jax="CHTML"][display="true"] { overflow-x: auto; overflow-y: hidden; }

@media (max-width: 640px) {
  body { font-size: 15.5px; line-height: 1.8; }
  h1 { font-size: 1.55rem; }
  h2 { font-size: 1.2rem; }
  main { padding: 1.4rem 0.9rem 4rem; }
}