/* Nagi Project — readable, calm, responsive site design */

:root {
  color-scheme: light dark;
  --bg: #f4f5f1;
  --surface: #ffffff;
  --surface-soft: #edf4f2;
  --ink: #1f2a2b;
  --muted: #5c6969;
  --line: #cad5d2;
  --sea: #176b76;
  --sea-deep: #0e4b54;
  --accent: #aa6d37;
  --focus: #b4521d;
  --quote: #e0eeea;
  --code-bg: #eef1ef;
  --shadow: 0 10px 28px rgba(22, 49, 47, 0.08);
  --radius: 16px;
  --content-width: 760px;
  --shell-width: 980px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(221, 239, 234, 0.58) 0, rgba(244, 245, 241, 0) 17rem),
    var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
  font-size: clamp(16px, 1rem + 0.1vw, 18px);
  line-height: 1.95;
  letter-spacing: 0.015em;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

::selection {
  color: #fff;
  background: var(--sea);
}

a {
  color: var(--sea-deep);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
  text-decoration-color: color-mix(in srgb, var(--sea) 52%, transparent);
}

a:hover {
  color: var(--accent);
  text-decoration-color: currentColor;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 4px;
  border-radius: 4px;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 30;
  padding: 0.55rem 0.85rem;
  color: #fff;
  background: var(--sea-deep);
  border-radius: 0.5rem;
  transform: translateY(-180%);
  transition: transform 160ms ease;
}

.skip-link:focus { transform: translateY(0); }

.site-shell {
  width: min(100% - 2rem, var(--shell-width));
  margin: 0 auto;
}

.site-header {
  padding: 1.1rem 0 0.9rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand-mark {
  display: block;
  width: 2.25rem;
  height: 2.25rem;
  flex: none;
}

.brand-subtitle {
  color: var(--muted);
  font-size: 0.78em;
  font-weight: 500;
  letter-spacing: 0.03em;
}

.nagi-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.6rem;
  margin-top: 0.9rem;
  padding: 0.75rem;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 4px 16px rgba(22, 49, 47, 0.04);
}

.nagi-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 2.35rem;
  padding: 0.3rem 0.65rem;
  color: var(--ink);
  text-decoration: none;
  border-radius: 0.6rem;
  font-size: 0.9rem;
  font-weight: 650;
  letter-spacing: 0.01em;
}

.nagi-nav a:hover,
.nagi-nav a:focus-visible {
  color: var(--sea-deep);
  background: var(--surface-soft);
}

.language-link {
  margin: 0.65rem 0 0;
  font-size: 0.88rem;
}

main.prose {
  width: min(100%, var(--content-width));
  margin: 1.35rem auto 0;
  padding: clamp(1.25rem, 3vw, 2.5rem);
  background: var(--surface);
  border: 1px solid color-mix(in srgb, var(--line) 85%, transparent);
  border-radius: clamp(12px, 2vw, 22px);
  box-shadow: var(--shadow);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.5rem;
  margin: 0 0 0.9rem;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.6;
}

.breadcrumbs a { color: var(--muted); }

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

.document-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem 0.85rem;
  margin: 0 0 1.15rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  min-height: 1.75rem;
  padding: 0.15rem 0.62rem;
  color: var(--sea-deep);
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-weight: 750;
  letter-spacing: 0.04em;
}

.document-role {
  color: var(--ink);
  font-weight: 650;
}

.status-archive,
.status-superseded,
.status-draft {
  color: color-mix(in srgb, var(--ink) 72%, var(--accent));
  background: color-mix(in srgb, var(--surface) 80%, var(--accent));
}

.archive-note {
  margin: 0 0 1.35rem;
  padding: 0.9rem 1rem;
  color: var(--ink);
  background: color-mix(in srgb, var(--surface) 84%, var(--accent));
  border: 1px solid color-mix(in srgb, var(--line) 66%, var(--accent));
  border-left: 5px solid var(--accent);
  border-radius: 0 0.75rem 0.75rem 0;
  font-size: 0.92rem;
}

.translation-note {
  margin: 0 0 1.35rem;
  padding: 0.9rem 1rem;
  color: var(--ink);
  background: color-mix(in srgb, var(--surface) 78%, #e6b84d);
  border: 1px solid color-mix(in srgb, var(--line) 58%, #c89622);
  border-left: 5px solid #c89622;
  border-radius: 0 0.75rem 0.75rem 0;
  font-size: 0.9rem;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4 {
  color: var(--ink);
  line-height: 1.42;
  scroll-margin-top: 1.5rem;
}

.prose h1 {
  margin: 0 0 1.25rem;
  padding-bottom: 0.9rem;
  border-bottom: 2px solid var(--sea);
  font-family: "Hiragino Mincho ProN", "Yu Mincho", "Hiragino Sans", serif;
  font-size: clamp(1.85rem, 6vw, 2.65rem);
  letter-spacing: 0.05em;
  font-weight: 700;
}

.prose h2 {
  margin-top: 3rem;
  margin-bottom: 1rem;
  padding-left: 0.85rem;
  border-left: 5px solid var(--sea);
  font-size: clamp(1.3rem, 3.5vw, 1.65rem);
}

.prose h3 {
  margin-top: 2.2rem;
  margin-bottom: 0.65rem;
  font-size: 1.16rem;
}

.prose h4 {
  margin-top: 1.6rem;
  margin-bottom: 0.5rem;
  color: var(--sea-deep);
  font-size: 1rem;
}

.prose p,
.prose li {
  overflow-wrap: anywhere;
}

.prose p { margin: 1.1rem 0; }

.prose ul,
.prose ol {
  margin: 1rem 0 1.35rem;
  padding-left: 1.55rem;
}

.prose li + li { margin-top: 0.42rem; }
.prose li::marker { color: var(--sea); }

.prose blockquote {
  margin: 1.7rem 0;
  padding: 1.05rem 1.2rem 1.05rem 1.3rem;
  color: color-mix(in srgb, var(--ink) 84%, var(--sea));
  background: var(--quote);
  border: 0;
  border-left: 5px solid var(--sea);
  border-radius: 0 0.85rem 0.85rem 0;
  font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: 1.04em;
}

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

.prose hr {
  height: 1px;
  margin: 3rem 0;
  border: 0;
  background: var(--line);
}

.prose strong {
  color: var(--sea-deep);
  font-weight: 750;
}

.prose code {
  padding: 0.12em 0.35em;
  color: color-mix(in srgb, var(--ink) 90%, var(--accent));
  background: var(--code-bg);
  border-radius: 0.32rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
}

.prose pre {
  overflow-x: auto;
  margin: 1.4rem 0;
  padding: 1rem 1.1rem;
  color: var(--ink);
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 0.85rem;
}

.prose pre code {
  padding: 0;
  color: inherit;
  background: transparent;
}

.prose table {
  display: block;
  width: 100%;
  overflow-x: auto;
  margin: 1.5rem 0;
  border-spacing: 0;
  border-collapse: separate;
  border: 1px solid var(--line);
  border-radius: 0.85rem;
  white-space: normal;
}

.prose th,
.prose td {
  min-width: 8rem;
  padding: 0.7rem 0.82rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.prose th {
  color: var(--sea-deep);
  background: var(--surface-soft);
  font-weight: 750;
}

.prose tr:last-child td { border-bottom: 0; }
.prose img { max-width: 100%; height: auto; border-radius: 0.85rem; }

.prose details {
  margin: 1.2rem 0;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  background: color-mix(in srgb, var(--surface-soft) 68%, var(--surface));
}

.prose summary {
  cursor: pointer;
  color: var(--sea-deep);
  font-weight: 700;
}

.related-documents {
  margin-top: 3rem;
  padding: 1rem 1.1rem;
  background: color-mix(in srgb, var(--surface-soft) 68%, var(--surface));
  border: 1px solid var(--line);
  border-radius: 0.85rem;
}

.related-documents h2 {
  margin: 0 0 0.8rem;
  padding: 0;
  border: 0;
  font-size: 1.1rem;
}

.related-documents ul {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding-left: 1.2rem;
}

.related-documents li span {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.5;
}

.site-footer {
  width: min(100%, var(--content-width));
  margin: 1.25rem auto 3rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.nagi-note {
  margin: 1.5rem 0 1rem;
  padding: 1rem 1.1rem;
  background: color-mix(in srgb, var(--surface-soft) 70%, var(--surface));
  border: 1px solid var(--line);
  border-radius: 0.85rem;
}

.site-footer ul {
  display: grid;
  gap: 0.38rem;
  padding-left: 1.2rem;
}

.site-footer p { margin-top: 1.2rem; }

@media (max-width: 640px) {
  .site-shell { width: min(100% - 1rem, var(--shell-width)); }
  .site-header { padding-top: 0.75rem; }
  .brand-subtitle { display: none; }
  .nagi-nav { gap: 0.28rem; padding: 0.45rem; }
  .nagi-nav a { min-height: 2.15rem; padding: 0.28rem 0.48rem; font-size: 0.82rem; }
  main.prose { margin-top: 0.75rem; padding: 1.15rem; border-radius: 12px; }
  .prose h2 { margin-top: 2.35rem; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101817;
    --surface: #172220;
    --surface-soft: #1c322e;
    --ink: #edf4f0;
    --muted: #b2c2bd;
    --line: #36504a;
    --sea: #74c5c4;
    --sea-deep: #9fe1dc;
    --accent: #e4b47e;
    --focus: #ffba63;
    --quote: #1b3731;
    --code-bg: #142b27;
    --shadow: 0 10px 28px rgba(0, 0, 0, 0.25);
  }

  body {
    background:
      linear-gradient(180deg, rgba(21, 68, 61, 0.52) 0, rgba(16, 24, 23, 0) 17rem),
      var(--bg);
  }

  a { text-decoration-color: color-mix(in srgb, var(--sea) 66%, transparent); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}