/* pureikyubu GitHub Pages — shared styles.
   Colours live in CSS variables so the light/dark switch is a single attribute. */

:root,
:root[data-theme="dark"] {
  --bg: #0e1018;
  --bg-soft: #141726;
  --surface: #191d30;
  --surface-2: #20253c;
  --border: #2b3150;
  --text: #e9ecf6;
  --muted: #9aa2c0;
  --accent: #5ea8ff;
  --accent-2: #7a5cff;
  --accent-soft: rgba(94, 168, 255, 0.14);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  --logo-bg: #0a1224;
  --code-bg: #101425;
}

:root[data-theme="light"] {
  --bg: #f5f7fc;
  --bg-soft: #eef1f9;
  --surface: #ffffff;
  --surface-2: #f1f4fb;
  --border: #d9dfee;
  --text: #161a28;
  --muted: #5b647f;
  --accent: #1d63d2;
  --accent-2: #6038d6;
  --accent-soft: rgba(29, 99, 210, 0.10);
  --shadow: 0 10px 26px rgba(23, 33, 66, 0.10);
  --logo-bg: #0a1224;
  --code-bg: #eef1f9;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

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

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

.wrap { width: min(1080px, 92vw); margin: 0 auto; }

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 66px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-right: auto;
  text-decoration: none;
}

.brand img {
  display: block;
  height: 34px;
  width: auto;
  border-radius: 6px;
  background: var(--logo-bg);
}

.brand:hover { text-decoration: none; }

.nav {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.nav a {
  color: var(--muted);
  padding: 7px 11px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
}

.nav a:hover { color: var(--text); background: var(--surface-2); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--text); background: var(--accent-soft); }

.lang-switch, .theme-toggle {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  padding: 6px 10px;
  cursor: pointer;
  line-height: 1.2;
}

.lang-switch { display: flex; gap: 4px; padding: 3px; }
.lang-switch a { color: var(--muted); padding: 3px 8px; border-radius: 6px; }
.lang-switch a.active { background: var(--accent-soft); color: var(--text); }
.lang-switch a:hover { text-decoration: none; color: var(--text); }

.theme-toggle:hover { color: var(--text); border-color: var(--accent); }

/* ---------- Hero ---------- */

.hero {
  padding: 64px 0 40px;
  background:
    radial-gradient(900px 380px at 12% -10%, var(--accent-soft), transparent 70%),
    var(--bg);
  border-bottom: 1px solid var(--border);
}

.hero h1 { font-size: clamp(28px, 4.4vw, 46px); line-height: 1.15; margin: 0 0 14px; }
.hero p.lead { font-size: clamp(17px, 2vw, 20px); color: var(--muted); max-width: 70ch; margin: 0 0 26px; }

.hero-logo {
  display: block;
  width: min(520px, 80vw);
  border-radius: 14px;
  background: var(--logo-bg);
  box-shadow: var(--shadow);
  margin-bottom: 28px;
}

.btn-row { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 11px 20px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  border: 1px solid transparent;
}

.btn:hover { text-decoration: none; filter: brightness(1.08); }
.btn.secondary { background: transparent; color: var(--text); border-color: var(--border); }
.btn.secondary:hover { border-color: var(--accent); }

/* ---------- Layout blocks ---------- */

main { padding: 8px 0 40px; }

section { padding: 34px 0; }

section > h2 {
  font-size: clamp(22px, 3vw, 30px);
  margin: 0 0 10px;
}

section > p.sub { color: var(--muted); margin: 0 0 22px; max-width: 75ch; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px 22px;
  box-shadow: var(--shadow);
}

.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card ul { margin: 10px 0 0; padding-left: 18px; color: var(--muted); font-size: 15px; }
.card li { margin: 4px 0; }

.card .badge { margin-bottom: 10px; display: inline-block; }

.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 3px 10px;
}

.shots {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}

figure {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

figure img { display: block; width: 100%; }

figcaption {
  padding: 12px 16px 14px;
  font-size: 14px;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

figcaption strong { color: var(--text); display: block; font-size: 15px; margin-bottom: 2px; }

/* ---------- Article (digest / release notes) ---------- */

.article { padding: 40px 0 20px; }

.article-header { border-bottom: 1px solid var(--border); padding-bottom: 22px; margin-bottom: 28px; }
.article-header h1 { font-size: clamp(26px, 4vw, 40px); margin: 0 0 10px; line-height: 1.2; }
.article-header .meta { color: var(--muted); font-size: 15px; }

.article h2 {
  font-size: clamp(21px, 2.6vw, 27px);
  margin: 42px 0 12px;
  padding-top: 6px;
}

.article h3 { font-size: 18px; margin: 26px 0 8px; }

.article p, .article li { color: var(--text); }
.article p { margin: 0 0 14px; }
.article ul, .article ol { margin: 0 0 16px; padding-left: 22px; }
.article li { margin: 5px 0; }

.article code {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 6px;
  font-family: "Cascadia Mono", Consolas, "SFMono-Regular", Menlo, monospace;
  font-size: 0.92em;
}

.article pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.5;
}

.article pre code { background: none; border: 0; padding: 0; }

.article table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 18px;
  font-size: 15px;
}

.article th, .article td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
  vertical-align: top;
}

.article th { background: var(--surface-2); }

.note {
  background: var(--surface);
  border-left: 3px solid var(--accent);
  border-radius: 0 10px 10px 0;
  padding: 14px 18px;
  margin: 0 0 18px;
  color: var(--muted);
}

.article figure { margin: 0 0 22px; }

.toc {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 22px;
  margin: 0 0 26px;
}

.toc h2 { font-size: 16px; margin: 0 0 10px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.toc ol { margin: 0; padding-left: 20px; }
.toc li { margin: 4px 0; }

.timeline { list-style: none; padding: 0; margin: 0; }
.timeline li {
  position: relative;
  padding: 0 0 18px 26px;
  border-left: 2px solid var(--border);
  margin-left: 6px;
}
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
}
.timeline .when { display: block; font-size: 13px; color: var(--muted); font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; }
.timeline .what { font-weight: 600; }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  padding: 30px 0;
  color: var(--muted);
  font-size: 14px;
}

.site-footer .wrap { display: flex; gap: 18px; flex-wrap: wrap; align-items: center; justify-content: space-between; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--accent); }


@media (max-width: 640px) {
  .site-header .wrap { min-height: 58px; gap: 10px; }
  .hero { padding: 40px 0 30px; }
  .brand img { height: 28px; }
}