@charset "UTF-8";

/* ===== Base ===== */
:root{
  --bg:#ffffff;
  --fg:#1f2937;         /* text */
  --muted:#6b7280;      /* secondary text */
  --primary:#0ea5e9;    /* accent */
  --border:#e5e7eb;
  --code-bg:#f8fafc;
  --radius:14px;
  --content-w:860px;
  --lh:1.85;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0b0f14;
    --fg:#e5e7eb;
    --muted:#94a3b8;
    --border:#1f2937;
    --code-bg:#0f172a;
  }
}
html{ scroll-behavior:smooth; }
body{
  margin:0; background:var(--bg); color:var(--fg);
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", Meiryo, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height:var(--lh);
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
}
.container{
  max-width:var(--content-w); margin:0 auto; padding:24px 20px 96px;
}

/* ===== Headline ===== */
.article-title{
  font-size: clamp(28px, 4.5vw, 44px);
  line-height:1.25;
  letter-spacing: .01em;
  margin: 8px 0 18px;
}
.lead{
  font-size: clamp(16px, 2.2vw, 19px);
  color: var(--muted);
  margin: 0 0 28px;
}

/* ===== Meta / Progress ===== */
.progress{
  position:fixed; inset:0 0 auto 0; height:4px; background:linear-gradient(90deg, var(--primary) var(--p,0%), transparent 0);
  z-index: 50;
}
.article-meta{
  display:flex; gap:14px; flex-wrap:wrap; align-items:center;
  font-size:14px; color:var(--muted); border-bottom:1px solid var(--border); padding-bottom:12px; margin-bottom:24px;
}

/* ===== Content ===== */
.prose h2{
  font-size: clamp(22px, 3.2vw, 30px);
  margin: 40px 0 10px;
  scroll-margin-top: 90px;
}
.prose h3{
  font-size: clamp(18px, 2.6vw, 22px);
  margin: 28px 0 8px;
  scroll-margin-top: 90px;
}
.prose p, .prose ul, .prose ol, .prose blockquote{
  margin: 0 0 18px;
}
.prose a{ color:var(--primary); text-underline-offset:2px; }
.prose blockquote{
  margin: 22px 0; padding: 14px 16px; background: var(--code-bg);
  border-left: 4px solid var(--primary); border-radius: var(--radius);
}
.prose code{
  background: var(--code-bg); padding: 2px 6px; border-radius: 8px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}
.prose pre{
  background: var(--code-bg); padding: 14px; overflow:auto; border-radius: var(--radius);
}

/* ===== TOC ===== */
.toc{
  position: sticky; top: 90px; border:1px solid var(--border); border-radius: var(--radius);
  padding:14px 14px; background: rgba(127,127,127,.03);
}
.toc h3{ margin:0 0 8px; font-size:14px; color:var(--muted); }
.toc a{ display:block; font-size:14px; color:var(--fg); text-decoration:none; padding:6px 0; opacity:.9; }
.toc a.active{ color:var(--primary); font-weight:600; }

/* ===== Share / Link copy ===== */
.anchor{
  visibility:hidden; margin-left:6px; font-size:.9em; color:var(--muted);
}
.prose h2:hover .anchor, .prose h3:hover .anchor{ visibility:visible; }

/* ===== Card ===== */
.callout{
  border:1px solid var(--border); border-radius: var(--radius); padding:16px;
  background:rgba(14,165,233,.06);
}

/* ===== Footer ===== */
.footer{
  border-top:1px solid var(--border); color:var(--muted); font-size:14px;
  margin-top:40px; padding-top:16px;
}

/* ===== Utilities ===== */
.badge{
  display:inline-flex; align-items:center; gap:8px;
  font-size:12px; padding:4px 10px; border-radius:999px; border:1px solid var(--border);
  background:rgba(127,127,127,.05);
}
.hidden-mobile{ display:block; }
@media (max-width: 920px){
  .layout{ display:block; }
  .hidden-mobile{ display:none; }
}