:root {
  --bg: #14171a;
  --card: #1e2328;
  --border: #333a40;
  --text: #e9edf0;
  --muted: #a3adb5;
  --accent: #6fd67a;
  --link: #a3e6a8;
  --link-hover: #6fd67a;
}
* { box-sizing: border-box; }
body {
  font-family: "Yu Gothic UI", "Yu Gothic", "Meiryo", "Hiragino Kaku Gothic ProN", "MS PGothic", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 0 16px 40px;
  line-height: 1.8;
}
nav {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 18px 4px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
  flex-wrap: wrap;
}
nav .brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: bold;
  color: var(--accent);
  margin-right: auto;
  font-size: 1.1em;
  text-decoration: none;
}
nav .brand:hover { color: #85e08f; }
nav .brand img { height: 24px; border-radius: 5px; }
nav .brand img.brand-logo { height: 32px; border-radius: 0; }
nav a { color: var(--muted); text-decoration: none; font-weight: 600; }
nav a:hover, nav a.active { color: var(--accent); }
.card {
  max-width: 820px;
  margin: 0 auto 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px 36px;
}
h1 { color: var(--accent); margin-top: 0; font-size: 1.6em; }
h2 { color: var(--text); border-bottom: 2px solid var(--border); padding-bottom: 6px; margin-top: 1.6em; font-size: 1.15em; }
h3 { color: var(--accent); margin-bottom: 6px; font-size: 1em; }
p { color: var(--text); }
a { color: var(--muted); text-decoration: underline; text-decoration-color: var(--border); }
a:hover { color: var(--accent); text-decoration-color: var(--accent); }
a:visited { color: var(--muted); }
code {
  background: #0f1215;
  border: 1px solid var(--border);
  color: #ffd479;
  padding: 2px 8px;
  border-radius: 4px;
  font-family: "SFMono-Regular", Consolas, monospace;
}
.box {
  background: #0f1215;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  margin: 12px 0;
}
.box div { margin: 4px 0; color: var(--muted); }
a.button {
  display: inline-block;
  background: var(--accent);
  color: #10240f;
  padding: 12px 22px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  margin-top: 10px;
}
a.button:hover { background: #85e08f; color: #10240f; }
ol li { margin-bottom: 10px; }
.mod-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
  margin: 14px 0 6px;
}
.mod-grid .mod {
  background: #0f1215;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
}
.mod-grid .mod .name { font-weight: bold; color: var(--text); }
.mod-grid .mod .name a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--border);
  text-underline-offset: 2px;
}
.mod-grid .mod .name a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}
.mod-grid .mod .desc { color: var(--muted); font-size: 0.9em; margin-top: 2px; }
.hero { text-align: center; padding: 12px 0 4px; }
.hero p.lead { color: var(--muted); font-size: 1.05em; margin-top: 22px; }
.hero .logo-img { max-width: 460px; width: 100%; height: auto; }
.grid2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}
.tile {
  background: #0f1215;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  text-decoration: none;
  display: block;
}
.tile h3 { margin-top: 0; }
.tile p { color: var(--muted); margin-bottom: 0; font-size: 0.92em; }

/* Mobile: tighten padding, stack nav cleanly, keep touch targets comfortable. */
@media (max-width: 600px) {
  body { padding: 0 12px 32px; line-height: 1.7; }
  nav {
    gap: 8px 16px;
    padding: 14px 4px;
    margin-bottom: 24px;
  }
  nav .brand {
    flex: 1 1 100%;
    order: -1;
    margin-right: 0;
    margin-bottom: 4px;
  }
  nav .brand img.brand-logo { height: 26px; }
  nav a:not(.brand) {
    padding: 8px 2px;
    line-height: 1;
  }
  .card {
    padding: 18px 18px;
    border-radius: 10px;
  }
  h1 { font-size: 1.35em; }
  h2 { font-size: 1.05em; }
  .hero { padding: 8px 0 4px; }
  .hero .logo-img { max-width: 300px; }
  .hero p.lead { font-size: 1em; margin-top: 16px; }
  a.button {
    display: block;
    text-align: center;
    padding: 14px 18px;
  }
  .mod-grid, .grid2 {
    grid-template-columns: 1fr;
  }
}