/* うごく図解の見た目。crofty のテーマの CSS のあとに読む（layouts/_default/baseof.html）。
   方向と理由は docs/11-design.md にある。色は明るい表示と暗い表示の両方で決める。
   動く図の色は --ugoku-* にまとめる。 */

:root {
  /* 地と文字。紙の地に、藍の墨で書く */
  --bg: #f6f5f0;
  --surface: #ffffff;
  --ink: #1b2533;
  --muted: #4f5866;
  --line: #d9d7cf;
  --accent: #1f4f8f;       /* 藍。リンク・誌名・さわれる部品 */
  --accent-soft: #e6edf7;
  --code-bg: #eeede6;
  --grid: rgba(31, 79, 143, 0.07); /* 図の地の方眼 */

  --measure: 44rem;
  --font-body: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "BIZ UDPGothic", "Noto Sans JP", "Meiryo", system-ui, sans-serif;
  --font-chrome: var(--font-body);

  --ugoku-surface: var(--surface);
  --ugoku-ink: var(--ink);
  --ugoku-muted: var(--muted);
  --ugoku-line: #cfcdc4;
  --ugoku-accent: var(--accent);
  --ugoku-1: #2563a8; /* 青 */
  --ugoku-2: #b8580b; /* 橙 */
  --ugoku-3: #2f7d34; /* 緑 */
  --ugoku-4: #7a4fa8; /* 紫 */
  --ugoku-soft-1: #e3edf8;
  --ugoku-soft-2: #fbeadc;
  --ugoku-soft-3: #e2f1e3;
  --ugoku-soft-4: #efe7f8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161c;
    --surface: #181e26;
    --ink: #e6e9ee;
    --muted: #a3abb8;
    --line: #2e3540;
    --accent: #93b8ec;
    --accent-soft: #1d2a3c;
    --code-bg: #1d232c;
    --grid: rgba(147, 184, 236, 0.07);

    --ugoku-line: #3a4250;
    --ugoku-1: #7fb5ec;
    --ugoku-2: #f0a35e;
    --ugoku-3: #86c98a;
    --ugoku-4: #bf9fe3;
    --ugoku-soft-1: #1c2b3b;
    --ugoku-soft-2: #3a2816;
    --ugoku-soft-3: #1d3320;
    --ugoku-soft-4: #2e2440;
  }
}

body { font-size: 1.0625rem; line-height: 1.9; }
p, li { overflow-wrap: anywhere; }

h1, h2, h3 { font-weight: 700; letter-spacing: 0.01em; font-feature-settings: "palt"; }
h2 { font-size: 1.4rem; margin: 3rem 0 0.75rem; }
h3 { font-size: 1.15rem; }

a { color: var(--accent); text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent); text-underline-offset: 3px; }
a:hover { color: var(--ink); text-decoration-color: currentColor; }

.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
  padding: 0.4rem 0.8rem;
  background: var(--bg);
  border: 2px solid var(--accent);
  z-index: 10;
}

:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

/* さわれる印（つまみの付いたスライダー）。誌名の印・図の枠・一覧の「動く図」で使う */
.touch-icon { flex: none; color: var(--accent); }

/* ---- 枠 ---- */

.site-header {
  align-items: center;
  padding-top: 1.25rem;
  padding-bottom: 1.25rem;
}
.site-title {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--ink);
  text-decoration: none;
}
.site-title:hover { color: var(--ink); }
.site-mark { color: var(--accent); flex: none; }
.site-title-text { display: flex; flex-direction: column; line-height: 1.3; }
.site-name { font-size: 1.2rem; font-weight: 800; letter-spacing: 0.04em; font-feature-settings: "palt"; }
.site-tagline { font-size: 0.72rem; font-weight: 400; color: var(--muted); letter-spacing: 0.02em; }
.site-header nav a { font-size: 0.92rem; color: var(--ink); }
.site-header nav a:hover { color: var(--accent); }

.site-footer {
  margin-top: 4rem;
  border-top: 1px solid var(--line);
  padding-top: 1.75rem;
  padding-bottom: 2.5rem;
  font-size: 0.88rem;
  color: var(--muted);
  text-align: left;
}
.site-footer-nav { display: flex; flex-wrap: wrap; gap: 0.4rem 1.25rem; margin-bottom: 0.6rem; }
.site-footer-nav a { color: var(--muted); text-decoration: none; }
.site-footer-nav a:hover { color: var(--ink); }
.site-footer-meta { margin: 0; }

/* ---- 共通の小さな部品 ---- */

.field-chip {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  line-height: 1.6;
  padding: 0 0.6rem;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
  text-decoration: none;
}
a.field-chip:hover { color: var(--ink); }
.kind-label { font-size: 0.78rem; color: var(--muted); }
.fig-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  margin: 0 0 1rem;
}
.section-title::after { content: ""; flex: 1; border-top: 1px solid var(--line); }

/* ---- トップ ---- */

.hero {
  display: grid;
  gap: 1.75rem;
  padding: 1.5rem 0 0.5rem;
}
.hero-title { font-size: clamp(2.25rem, 8vw, 3.25rem); line-height: 1.15; margin: 0 0 0.5rem; letter-spacing: 0.04em; }
.hero-subtitle { font-size: 1.15rem; color: var(--accent); font-weight: 700; margin: 0 0 0.75rem; }
.hero-lead { color: var(--muted); margin: 0; }

.hero-steps {
  list-style: none;
  margin: 0;
  padding: 1rem 1.1rem;
  display: grid;
  gap: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background-color: var(--surface);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 16px 16px;
  font-size: 0.9rem;
  line-height: 1.7;
}
.hero-steps li { display: flex; gap: 0.75rem; align-items: flex-start; }
.hero-steps strong { display: block; color: var(--ink); }
.hero-steps li > span:last-child { color: var(--muted); }
.hero-step-no {
  flex: none;
  display: grid;
  place-items: center;
  width: 1.8rem;
  height: 1.8rem;
  border-radius: 50%;
  border: 2px solid var(--accent);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.85rem;
  background: var(--surface);
}

.home-section { margin-top: 3rem; }
.more { margin-top: 1rem; font-size: 0.95rem; }
.empty { color: var(--muted); }

/* ---- 分野の入口 ---- */

.field-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.6rem;
}
@media (min-width: 40rem) { .field-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.75rem; } }
.field-grid a {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  height: 100%;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  text-decoration: none;
  background: var(--surface);
  color: var(--ink);
}
.field-grid a:hover { border-color: var(--accent); }
.field-grid-name { font-weight: 700; }
.field-grid-examples { font-size: 0.85rem; color: var(--muted); line-height: 1.6; }
.field-grid-count { font-size: 0.8rem; font-weight: 600; color: var(--accent); margin-top: auto; padding-top: 0.25rem; }

/* ---- 記事の一覧 ---- */

.article-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.75rem; }
.article-item {
  position: relative;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
}
.article-item:hover { border-color: var(--accent); }
.article-item-kicker { margin: 0 0 0.35rem; display: flex; gap: 0.6rem; align-items: center; flex-wrap: wrap; line-height: 1.6; }
.article-item-title {
  display: block;
  font-weight: 700;
  font-size: 1.15rem;
  line-height: 1.5;
  color: var(--ink);
  text-decoration: none;
  font-feature-settings: "palt";
}
/* 一覧の1件は、どこを押しても記事へ行く */
.article-item-title::after { content: ""; position: absolute; inset: 0; border-radius: 10px; }
.article-item-summary { margin: 0.35rem 0 0.5rem; color: var(--muted); font-size: 0.93rem; line-height: 1.8; }
.article-item-meta { margin: 0; font-size: 0.82rem; color: var(--muted); display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; }
.article-item-meta time { color: var(--muted); }

.page-header { margin: 1.5rem 0 1rem; }
.page-header h1 { text-align: left; margin: 0; font-size: 1.9rem; }
.page-kicker { margin: 0 0 0.25rem; font-size: 0.85rem; color: var(--muted); }
.page-kicker a { color: var(--muted); }
.page-intro { color: var(--muted); margin-bottom: 1.5rem; }

.pagination { display: flex; justify-content: space-between; gap: 1rem; margin-top: 2rem; font-size: 0.9rem; }
.pagination .is-disabled { color: var(--muted); opacity: 0.6; }

/* ---- 記事と定型ページ ---- */

.post-header { text-align: left; margin: 1.5rem 0 2rem; }
.post-header h1 { font-size: clamp(1.7rem, 5.5vw, 2.25rem); line-height: 1.35; margin: 0 0 0.75rem; font-feature-settings: "palt"; }
.post-meta {
  font-variant: normal;
  letter-spacing: 0;
  font-size: 0.85rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 1rem;
}
.article-fields { margin: 0 0 0.75rem; display: flex; gap: 0.6rem; align-items: center; flex-wrap: wrap; line-height: 1.6; }
.article-lead { color: var(--muted); font-size: 1.05rem; margin-bottom: 0.75rem; }
.post h2 { padding-top: 0.75rem; border-top: 2px solid var(--ink); }
.post-header + p, .post-header + h2 { margin-top: 0; }

/* 記事の終わりの「確かめるための欄」 */
.article-simplified, .article-sources {
  margin-top: 3rem;
  padding: 0.25rem 1.1rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  font-size: 0.93rem;
}
.article-simplified { border-style: dashed; border-color: var(--ugoku-line); }
.post .article-simplified h2, .post .article-sources h2 { border-top: 0; font-size: 1.05rem; margin: 0.9rem 0 0.5rem; padding-top: 0; }
.article-simplified ul, .article-sources ol { padding-left: 1.25rem; margin-bottom: 0.5rem; }
.article-simplified li + li, .article-sources li + li { margin-top: 0.4rem; }
.article-sources { margin-top: 1rem; }
.article-made-by { margin-top: 2rem; font-size: 0.85rem; color: var(--muted); }
.post-nav { font-size: 0.9rem; }
.post-nav a { color: var(--accent); }

.page-404 .field-grid { margin-top: 1.5rem; }
.page-404 .page-kicker { font-weight: 700; color: var(--accent); letter-spacing: 0.1em; }

table { font-size: 0.93rem; }
th { background: color-mix(in srgb, var(--accent) 6%, transparent); }

/* ---- 動く図 ----
   見出しの帯（図の番号と「さわれる」の印）・方眼の地の図・操作盤・説明の文、の4段。 */

.ugoku {
  text-align: left;
  margin: 2rem 0;
  border: 1px solid var(--ugoku-line);
  border-radius: 12px;
  background: var(--ugoku-surface);
  overflow: hidden;
  box-shadow: 0 1px 0 var(--line);
}
.ugoku-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  margin: 0;
  padding: 0.45rem 1rem;
  border-bottom: 1px solid var(--ugoku-line);
  font-size: 0.82rem;
  line-height: 1.5;
}
.ugoku-num { font-weight: 800; letter-spacing: 0.06em; color: var(--ink); }
.ugoku-hint { display: inline-flex; align-items: center; gap: 0.4rem; color: var(--accent); font-weight: 600; }

.ugoku-stage {
  display: flex;
  justify-content: center;
  padding: 1rem;
  background-color: var(--ugoku-surface);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 16px 16px;
  background-position: -1px -1px;
}
.ugoku-svg { display: block; width: 100%; height: auto; overflow: visible; font-family: var(--font-body); font-variant-numeric: tabular-nums; }
.ugoku-svg text { fill: var(--ugoku-ink); }
.ugoku-fallback { color: var(--muted); font-size: 0.9rem; margin: 0; }

/* 操作盤。図と分けて、さわる場所をひとまとめにする */
.ugoku-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  align-items: end;
  padding: 0.9rem 1rem;
  border-top: 1px solid var(--ugoku-line);
  background: var(--accent-soft);
  font-size: 0.9rem;
}
.ugoku-controls:empty { display: none; }
.ugoku-controls > .ugoku-legend,
.ugoku-controls > .ugoku-readout { flex: 1 0 100%; margin: 0; }
.ugoku-control { display: flex; flex-direction: column; gap: 0.25rem; min-width: 0; }
.ugoku-slider {
  flex: 1 1 18rem;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  column-gap: 0.5rem;
}
.ugoku-slider label { font-weight: 600; }
.ugoku-slider input { grid-column: 1 / -1; width: 100%; margin: 0; min-height: 44px; accent-color: var(--ugoku-accent); cursor: pointer; }
.ugoku-value {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--accent);
}
.ugoku-label { color: var(--muted); font-weight: 600; }

.ugoku button {
  font: inherit;
  font-weight: 600;
  min-height: 44px;
  padding: 0.35rem 0.95rem;
  border-radius: 8px;
  border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--ugoku-line));
  background: var(--surface);
  color: var(--accent);
  cursor: pointer;
  touch-action: manipulation;
  box-shadow: 0 1px 0 color-mix(in srgb, var(--accent) 25%, transparent);
}
.ugoku button:hover { border-color: var(--ugoku-accent); }
.ugoku button:active { transform: translateY(1px); box-shadow: none; }
.ugoku button[aria-pressed="true"] {
  background: var(--ugoku-accent);
  border-color: var(--ugoku-accent);
  color: var(--bg);
}
.ugoku-choice { display: flex; flex-wrap: wrap; gap: 0.35rem; }

.ugoku-readout {
  margin: 0;
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  border-left: 3px solid var(--ugoku-accent);
  background: var(--surface);
  font-size: 0.95rem;
  line-height: 1.7;
}

.ugoku-legend {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  font-size: 0.85rem;
  color: var(--muted);
}
.ugoku-legend li { display: inline-flex; align-items: center; gap: 0.35rem; }

.ugoku-caption {
  margin: 0;
  padding: 0.85rem 1rem 1rem;
  border-top: 1px solid var(--ugoku-line);
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--ink);
}
.ugoku-caption p:last-child { margin-bottom: 0; }

/* ---- 幅 ---- */

@media (min-width: 52rem) {
  .hero { grid-template-columns: 1.2fr 1fr; align-items: center; padding-top: 2.5rem; }
}

@media (max-width: 480px) {
  .site-header, .content, .site-footer { padding-inline: 1rem; }
  .site-tagline { display: none; }
  .site-header nav a { margin-left: 0.75rem; font-size: 0.88rem; }
  .ugoku { margin-inline: -0.25rem; }
  .ugoku-stage { padding: 0.75rem 0.5rem; }
  .ugoku-controls, .ugoku-caption, .ugoku-head { padding-inline: 0.75rem; }
  .field-grid a { padding: 0.75rem 0.8rem; }
  .field-grid-examples { font-size: 0.8rem; }
}