/* note-leva — 計測ノート的な体裁。外部リクエストゼロ（Webフォント不使用）。 */

:root {
  --paper:      #fbfbfc;
  --paper-sunk: #f2f3f6;
  --ink:        #16181d;
  --ink-soft:   #5a6068;
  --ink-faint:  #8b929b;
  --rule:       #dfe2e7;
  --signal:     #1f5f8b;

  --sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP",
          "Yu Gothic UI", Meiryo, system-ui, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
          "Noto Sans Mono CJK JP", monospace;

  --measure: 34rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:      #14161a;
    --paper-sunk: #1b1e24;
    --ink:        #e6e8ec;
    --ink-soft:   #a2a9b3;
    --ink-faint:  #6d747d;
    --rule:       #2b2f37;
    --signal:     #6fb3dc;
  }
}

*, *::before, *::after { box-sizing: border-box; }

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.85;
  font-feature-settings: "palt" 1;
}

.wrap {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---- ヘッダ ---- */

.masthead {
  border-bottom: 1px solid var(--rule);
  padding: 2.5rem 0 1.25rem;
  margin-bottom: 2.5rem;
}

.masthead h1,
.masthead .sitename {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 650;
  letter-spacing: 0.02em;
}

.masthead a.sitename {
  color: var(--ink);
  text-decoration: none;
}

.masthead .tagline {
  margin: 0.35rem 0 0;
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--ink-faint);
  letter-spacing: 0.01em;
}

nav.top {
  margin-top: 1rem;
  font-family: var(--mono);
  font-size: 0.75rem;
}

nav.top a {
  color: var(--ink-soft);
  text-decoration: none;
  margin-right: 1.25rem;
}

nav.top a:hover { color: var(--signal); }

/* ---- 記事ログ（インデックス） ---- */

.log { margin: 0 0 3rem; }

.log-head {
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--rule);
}

.entry {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--rule);
}

.entry:hover .entry-title { color: var(--signal); }

.entry-meta {
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
  display: flex;
  gap: 0.85rem;
  margin-bottom: 0.15rem;
}

.entry-title {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.55;
  letter-spacing: 0.005em;
}

.entry-note {
  margin-top: 0.25rem;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---- 記事本文 ---- */

article header.post-head {
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 2rem;
}

article h1 {
  font-size: 1.5rem;
  font-weight: 680;
  line-height: 1.5;
  letter-spacing: 0.005em;
  margin: 0 0 0.9rem;
}

/* 署名的要素: 計測環境ストリップ */
.strip {
  font-family: var(--mono);
  font-size: 0.6875rem;
  line-height: 1.9;
  color: var(--ink-soft);
  background: var(--paper-sunk);
  border-left: 2px solid var(--signal);
  padding: 0.6rem 0.85rem;
  margin: 0;
}

.strip dt {
  display: inline;
  color: var(--ink-faint);
}

.strip dt::after { content: "  "; white-space: pre; }

.strip dd {
  display: inline;
  margin: 0;
}

.strip dd::after { content: "\A"; white-space: pre; }

article h2 {
  font-size: 1.0625rem;
  font-weight: 650;
  letter-spacing: 0.01em;
  margin: 2.75rem 0 0.75rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--rule);
}

article h3 {
  font-size: 0.9375rem;
  font-weight: 650;
  margin: 1.9rem 0 0.5rem;
}

article p { margin: 0 0 1.15rem; }

article a { color: var(--signal); text-underline-offset: 2px; }

article ul, article ol { padding-left: 1.35rem; margin: 0 0 1.15rem; }
article li { margin-bottom: 0.35rem; }

article code {
  font-family: var(--mono);
  font-size: 0.8125em;
  background: var(--paper-sunk);
  padding: 0.1em 0.35em;
  border-radius: 2px;
}

article pre {
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.7;
  background: var(--paper-sunk);
  border: 1px solid var(--rule);
  padding: 0.9rem 1rem;
  overflow-x: auto;
  margin: 0 0 1.35rem;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
  margin: 0 0 1.5rem;
}

th, td {
  text-align: left;
  padding: 0.5rem 0.7rem 0.5rem 0;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}

th {
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

td.num { font-family: var(--mono); font-variant-numeric: tabular-nums; }

blockquote {
  margin: 0 0 1.15rem;
  padding-left: 0.9rem;
  border-left: 2px solid var(--rule);
  color: var(--ink-soft);
}

hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }

/* ---- フッタ ---- */

footer.site {
  border-top: 1px solid var(--rule);
  margin-top: 4rem;
  padding: 1.5rem 0 3rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
}

footer.site a { color: var(--ink-soft); text-decoration: none; }
footer.site a:hover { color: var(--signal); }

/* ---- アクセシビリティ ---- */

a:focus-visible,
.entry:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip {
  position: absolute;
  left: -9999px;
}

.skip:focus {
  left: 1rem;
  top: 1rem;
  background: var(--paper);
  border: 1px solid var(--signal);
  padding: 0.5rem 0.9rem;
  z-index: 10;
}

@media (max-width: 480px) {
  body { font-size: 15px; }
  .wrap { padding: 0 1.15rem; }
  article h1 { font-size: 1.3125rem; }
}