/* jcraft.com — minimal, responsive, no external dependencies */

:root {
  --accent: #58A746;
  --accent-strong: #3f7d32;
  --bg: #ffffff;
  --bg-alt: #f5f7f4;
  --text: #24292f;
  --text-muted: #6a737d;
  --border: #d8dee4;
  --code-bg: #f0f2ef;
  --max-width: 1080px;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, "Hiragino Kaku Gothic ProN", "Noto Sans CJK JP", Meiryo, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--text);
  background-color: var(--bg);
}

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

img {
  max-width: 100%;
  height: auto;
  border: 0;
}

/* ---- header ---- */

.site-header {
  border-bottom: 3px solid var(--accent);
  background-color: var(--bg-alt);
}

.site-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.1rem 1.25rem;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
  text-decoration: none;
}
.brand:hover {
  text-decoration: none;
}

.brand-name {
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--accent);
}

.brand-tagline {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* ---- layout ---- */

.layout {
  display: flex;
  gap: 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1.25rem;
  align-items: flex-start;
}

.sidebar {
  flex: 0 0 220px;
  min-width: 0;
}

.content {
  flex: 1 1 auto;
  min-width: 0;
}

/* ---- sidebar navigation ---- */

.nav-group,
.sidebar .content_menu {
  margin: 0 0 1.25rem 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background-color: var(--bg-alt);
  padding: 0.4rem 0;
  overflow: hidden;
}

.nav-group summary,
.sidebar .content_menu > div {
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding: 0.35rem 0.85rem;
  cursor: default;
}

.nav-group summary {
  cursor: pointer;
  list-style: none;
}
.nav-group summary::-webkit-details-marker {
  display: none;
}

.nav-group a,
.sidebar .content_menu a {
  display: block;
  padding: 0.3rem 0.85rem;
  font-size: 0.95rem;
  color: var(--text);
}

.nav-group a:hover,
.sidebar .content_menu a:hover {
  background-color: var(--code-bg);
  color: var(--accent-strong);
  text-decoration: none;
}

.sidebar .content_menu {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.sidebar .content_menu img {
  margin: 0.3rem 0.85rem;
}

.sidebar-news {
  margin: 0 0 1.25rem 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background-color: var(--bg-alt);
  padding: 0.4rem 0;
}

.sidebar-news-title {
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding: 0.35rem 0.85rem;
}

.sidebar-news-item {
  font-size: 0.85rem;
  padding: 0.3rem 0.85rem;
}

/* ---- content typography ---- */

.content h2 {
  font-size: 1.55rem;
  line-height: 1.3;
  margin: 0 0 1rem 0;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--accent);
  color: var(--accent-strong);
  font-weight: 650;
}

.content h2 ~ h2 {
  margin-top: 2rem;
}

.content h3 {
  font-size: 1.2rem;
  margin: 1.5rem 0 0.5rem 0;
  color: var(--text);
}

.content ul {
  padding-left: 1.4rem;
}

.content dl dt {
  font-weight: 600;
  color: var(--text-muted);
  margin-top: 0.9rem;
  font-size: 0.95rem;
}

.content dl dd {
  margin: 0.15rem 0 0 1rem;
}

.content table {
  border-collapse: collapse;
  max-width: 100%;
  display: block;
  overflow-x: auto;
}

.content th,
.content td {
  border: 1px solid var(--border);
  padding: 0.35rem 0.6rem;
  text-align: left;
}

.content th {
  background-color: var(--bg-alt);
}

/* legacy layout tables (border="0") stay borderless */
.content table[border="0"] th,
.content table[border="0"] td {
  border: 0;
}

.content figure {
  margin: 1.2rem 0;
}

.content figcaption {
  margin-top: 0.4rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.content pre {
  background-color: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.5;
}

.content code,
.content tt {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono",
    monospace;
  font-size: 0.9em;
  background-color: var(--code-bg);
  border-radius: 4px;
  padding: 0.1em 0.3em;
}

.content pre code,
.content pre tt {
  background: none;
  padding: 0;
}

.content hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 1.5rem 0;
}

.content blockquote {
  margin: 1rem 0;
  padding: 0.1rem 1rem;
  border-left: 3px solid var(--accent);
  background-color: var(--bg-alt);
  color: var(--text-muted);
}

/* ---- forms (contact/search remnants) ---- */

input,
textarea {
  font: inherit;
  color: inherit;
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.25rem 0.5rem;
}

/* ---- footer ---- */

.site-footer {
  border-top: 1px solid var(--border);
  background-color: var(--bg-alt);
  margin-top: 2rem;
}

.site-footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.25rem;
  display: flex;
  justify-content: space-between;
  gap: 0.5rem 2rem;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ---- responsive ---- */

@media (max-width: 768px) {
  .layout {
    flex-direction: column;
    padding: 1rem;
  }

  .sidebar {
    flex: 1 1 auto;
    width: 100%;
  }

  /* comfortable tap targets (~44px) on touch devices */
  .nav-group a,
  .sidebar .content_menu a {
    display: inline-block;
    padding: 0.55rem 0.85rem;
  }

  .nav-group summary,
  .sidebar .content_menu > div {
    padding-top: 0.6rem;
    padding-bottom: 0.6rem;
  }

  .content a {
    padding: 0.15rem 0;
  }

  .site-footer-inner {
    flex-direction: column;
    gap: 0.25rem;
  }
}