/* =========================================================
   nkmrkisk.com — minimal static site
   1枚CSS。ビルド不要。外部フォント/JSなし。
   ========================================================= */

:root {
  color-scheme: light dark;

  --bg: #fbfaf8;
  --fg: #17171b;
  --muted: #6b6b73;
  --line: #e3dfd7;
  --accent: #2f5d50;

  --max: 40rem;
  --pad: clamp(1.25rem, 5vw, 2.5rem);

  --sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101012;
    --fg: #ecece8;
    --muted: #9b9ba3;
    --line: #2b2b31;
    --accent: #8fbfae;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: clamp(1rem, 0.96rem + 0.22vw, 1.0625rem);
  font-weight: 400;
  line-height: 1.9;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------- top page ---------- */

.solo {
  display: grid;
  place-items: center;
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0;
  padding: var(--pad);
}

.solo h1 {
  margin: 0;
  font-size: clamp(1.125rem, 1rem + 1vw, 1.5rem);
  font-weight: 400;
  letter-spacing: 0.22em;
}

/* ---------- inner pages ---------- */

.shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  padding: clamp(1.5rem, 4vw, 2.25rem) 0 1rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: inherit;
  text-decoration: none;
}

.nav {
  display: flex;
  gap: clamp(0.9rem, 3vw, 1.75rem);
}

.nav a {
  padding-bottom: 0.15rem;
  border-bottom: 1px solid transparent;
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.nav a:hover {
  color: var(--fg);
}

.nav a[aria-current="page"] {
  color: var(--fg);
  border-bottom-color: var(--fg);
}

.page {
  padding: clamp(2.5rem, 8vw, 4.5rem) 0 clamp(3rem, 8vw, 5rem);
}

.page h1 {
  margin: 0 0 2.25rem;
  font-size: clamp(1.375rem, 1.1rem + 1.2vw, 1.75rem);
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.06em;
}

/* ---------- 本文（元サイトのHTMLをそのまま流し込む） ---------- */

.prose > :first-child {
  margin-top: 0;
}

.prose h2 {
  margin: 2.75rem 0 1rem;
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.7;
  letter-spacing: 0.08em;
}

.prose h3 {
  margin: 2rem 0 0.75rem;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.7;
  letter-spacing: 0.06em;
}

.prose h4 {
  margin: 1.5rem 0 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.prose p {
  margin: 0 0 1.25rem;
}

.prose ul,
.prose ol {
  margin: 0 0 1.25rem;
  padding-left: 1.35em;
}

.prose li {
  margin: 0 0 0.5rem;
}

.prose li > ul,
.prose li > ol {
  margin: 0.5rem 0;
  padding-left: 1.2em;
}

.prose ul ul {
  list-style-type: circle;
}

.prose ul ul ul {
  list-style-type: square;
}

.prose blockquote {
  margin: 1.5rem 0;
  padding: 0.125rem 0 0.125rem 1.1rem;
  border-left: 2px solid var(--line);
  font-size: 0.9375rem;
  color: var(--muted);
}

.prose blockquote p {
  margin: 0 0 0.6rem;
}

.prose blockquote p:last-child {
  margin-bottom: 0;
}

.prose hr {
  margin: 2.5rem 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.prose strong {
  font-weight: 600;
}

.prose a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--line);
  text-underline-offset: 0.2em;
  overflow-wrap: anywhere;
}

.prose a:hover {
  text-decoration-color: currentColor;
}

/* ---------- 404 ---------- */

.nf {
  margin: 0 0 0.75rem;
  font-family: var(--mono);
  font-size: clamp(2.25rem, 9vw, 3.5rem);
  letter-spacing: 0.1em;
  line-height: 1.2;
}

.lead {
  margin: 0 0 2rem;
  color: var(--muted);
}

.back {
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-decoration: none;
}

.back:hover {
  color: var(--fg);
}

/* ---------- misc ---------- */

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
    scroll-behavior: auto !important;
  }
}