/* continuum AIDLC Docs — sand & sumi (decks-aligned) stylesheet */

:root {
  /* Palette — aligned with decks (Continuum-preliminary / -final) */
  --color-bg: #f4f1e8;             /* sand */
  --color-bg-soft: #ede8d8;        /* sand-deep (sidebar / cards) */
  --color-bg-sidebar: #ede8d8;
  --color-bg-paper: #faf8f1;       /* lighter card / inline */
  --color-border: #d6d0bf;         /* soft rule */
  --color-border-strong: #b8b0a0;
  --color-text: #18171a;           /* sumi (墨) */
  --color-text-soft: #4a4953;
  --color-text-muted: #7d7a86;
  --color-link: #2d3a5f;           /* gunjo (紺青) */
  --color-link-hover: #1d2a4e;
  --color-accent: #2d3a5f;         /* gunjo as primary accent */
  --color-accent-soft: rgba(45, 58, 95, 0.08);
  --color-shu: #a83c2c;            /* 朱 (secondary accent) */
  --color-shu-soft: rgba(168, 60, 44, 0.08);
  --color-dark: #18171a;
  --color-dark-soft: #2a2830;
  --color-code-bg: rgba(45, 58, 95, 0.06);
  --color-quote-bar: #2d3a5f;
  --color-quote-bg: rgba(45, 58, 95, 0.04);

  /* Layout */
  --topbar-h: 64px;
  --sidebar-w: 280px;
  --content-max: 880px;
  --radius: 2px;
  --radius-lg: 4px;
  --shadow-sm: 0 1px 2px rgba(24, 23, 26, 0.04);
  --shadow: 0 4px 18px rgba(24, 23, 26, 0.06);

  /* Typography — Shippori Mincho B1 / Noto Serif JP for headings, Noto Sans JP for body, JetBrains Mono for code */
  --font-serif: "Shippori Mincho B1", "Noto Serif JP", "Hiragino Mincho ProN", "YuMincho", "Yu Mincho", serif;
  --font-sans: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 400;
  line-height: 1.85;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle diagonal stripe pattern overlay (decks signature) */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    135deg,
    rgba(24, 23, 26, 0.012) 0,
    rgba(24, 23, 26, 0.012) 1px,
    transparent 1px,
    transparent 14px
  );
  z-index: 0;
}

a { color: var(--color-link); text-decoration: none; }
a:hover { color: var(--color-link-hover); text-decoration: underline; text-underline-offset: 3px; }

/* === Topbar === */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--topbar-h);
  background: rgba(244, 241, 232, 0.88);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.topbar-inner {
  max-width: 1400px;
  margin: 0 auto;
  height: 100%;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--color-text);
  font-family: var(--font-serif);
  font-weight: 500;
}
.brand:hover { text-decoration: none; }
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: transparent;
  color: var(--color-link);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 22px;
  font-weight: 500;
  line-height: 1;
  border: 1.5px solid var(--color-link);
  position: relative;
}
.brand-text {
  font-size: 18px;
  letter-spacing: 0.02em;
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-muted);
  font-weight: 400;
  margin-left: 8px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.external {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--color-text-soft);
  padding: 7px 14px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  background: var(--color-bg-paper);
  transition: all 0.15s;
}
.external:hover {
  text-decoration: none;
  border-color: var(--color-link);
  color: var(--color-link);
  background: var(--color-bg-paper);
}

/* === Layout === */
.layout {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  gap: 0;
}
.sidebar {
  position: sticky;
  top: var(--topbar-h);
  align-self: start;
  height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
  padding: 32px 16px 32px 32px;
  border-right: 1px solid var(--color-border);
  background: var(--color-bg-soft);
}
.main {
  padding: 32px 40px 96px;
  min-width: 0;
}

/* === Sidebar nav === */
.sidebar details {
  margin-bottom: 18px;
  border: none;
}
.sidebar details summary {
  cursor: pointer;
  list-style: none;
  padding: 6px 0;
  user-select: none;
}
.sidebar details summary::-webkit-details-marker { display: none; }
.sidebar details summary::before {
  content: "▸";
  display: inline-block;
  width: 16px;
  font-size: 10px;
  color: var(--color-text-muted);
  transition: transform 0.15s;
}
.sidebar details[open] summary::before { transform: rotate(90deg); }
.group-title {
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-text);
}
.doc-list {
  list-style: none;
  margin: 6px 0 0;
  padding: 0 0 0 18px;
}
.doc-list li {
  margin: 1px 0;
}
.doc-list a {
  display: block;
  padding: 6px 12px;
  font-size: 13px;
  color: var(--color-text-soft);
  border-radius: var(--radius);
  border-left: 2px solid transparent;
  transition: all 0.12s;
}
.doc-list a:hover {
  background: var(--color-bg-paper);
  color: var(--color-text);
  text-decoration: none;
  border-left-color: var(--color-border-strong);
}
.doc-list li.current a {
  background: var(--color-bg-paper);
  color: var(--color-link);
  font-weight: 500;
  border-left-color: var(--color-link);
}

/* === Breadcrumb === */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  margin-bottom: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}
.breadcrumb .sep { color: var(--color-text-muted); }
.breadcrumb .current { color: var(--color-text); font-weight: 500; }
.breadcrumb a { color: var(--color-text-soft); }
.breadcrumb a:hover { color: var(--color-link); }

/* === TOC === */
.toc {
  background: var(--color-bg-paper);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-link);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  padding: 18px 24px;
  margin: 0 0 40px 0;
  font-size: 13px;
}
.toc h3 {
  font-family: var(--font-mono);
  margin: 0 0 10px 0;
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
  columns: 2;
  column-gap: 32px;
}
.toc li { margin: 3px 0; break-inside: avoid; }
.toc a { color: var(--color-text-soft); }
.toc a:hover { color: var(--color-link); }
.toc-l1 { font-weight: 500; }
.toc-l2 { padding-left: 14px; }
.toc-l3 { padding-left: 28px; font-size: 12px; }

/* === Content === */
.content {
  max-width: var(--content-max);
}
.content h1, .content h2, .content h3, .content h4 {
  font-family: var(--font-serif);
  font-weight: 500;
  letter-spacing: 0.02em;
  margin-top: 1.8em;
  margin-bottom: 0.6em;
  line-height: 1.4;
  scroll-margin-top: 80px;
  color: var(--color-text);
}
.content h1 {
  font-size: 34px;
  font-weight: 700;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 16px;
  margin-top: 0;
  letter-spacing: 0.04em;
}
.content h2 {
  font-size: 25px;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 10px;
}
.content h3 { font-size: 20px; color: var(--color-text); }
.content h4 { font-size: 16px; color: var(--color-text-soft); font-weight: 500; }

.content p { margin: 0 0 1.1em; }
.content ul, .content ol { padding-left: 1.6em; margin: 0 0 1.1em; }
.content li { margin: 4px 0; }

.content strong, .content b { font-weight: 700; color: var(--color-text); }
.content em, .content i { font-style: italic; }

.content blockquote {
  margin: 1.2em 0;
  padding: 12px 20px;
  border-left: 3px solid var(--color-quote-bar);
  background: var(--color-quote-bg);
  color: var(--color-text-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
}
.content blockquote p:last-child { margin-bottom: 0; }
.content blockquote em, .content blockquote i { font-style: normal; }

.content code {
  background: var(--color-code-bg);
  padding: 2px 7px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.86em;
  color: var(--color-link);
  border: 1px solid var(--color-border);
}
.content pre {
  background: var(--color-bg-paper);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-border-strong);
  padding: 16px 22px;
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.65;
  margin: 1.2em 0;
}
.content pre code {
  background: transparent;
  padding: 0;
  border: none;
  color: var(--color-text);
  font-size: inherit;
}
.content pre.mermaid {
  background: var(--color-bg-paper);
  text-align: center;
  border: 1px dashed var(--color-border-strong);
  border-left-width: 1px;
}

/* === Tables === */
.content table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.4em 0;
  font-size: 14px;
  overflow: auto;
  display: block;
}
.content table thead {
  background: transparent;
  border-bottom: 2px solid var(--color-text);
}
.content table th {
  font-family: var(--font-mono);
  text-align: left;
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-soft);
  padding: 12px 16px;
  white-space: nowrap;
}
.content table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}
.content table tbody tr:hover {
  background: var(--color-bg-paper);
}

/* === Images === */
.content img { max-width: 100%; height: auto; }

/* === Details === */
.content details {
  margin: 1.2em 0;
  padding: 12px 20px;
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-link);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--color-bg-paper);
}
.content details summary {
  cursor: pointer;
  font-family: var(--font-serif);
  font-weight: 500;
  color: var(--color-text);
}
.content details[open] summary {
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

/* === HR === */
.content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 3em 0;
  position: relative;
}
.content hr::after {
  content: "◇";
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-bg);
  padding: 0 12px;
  color: var(--color-border-strong);
  font-size: 14px;
}

/* === kbd === */
.content kbd {
  display: inline-block;
  padding: 2px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--color-link);
  background: var(--color-bg-paper);
  border: 1px solid var(--color-link);
  border-radius: 3px;
}

/* === Mermaid sizing === */
.mermaid svg { max-width: 100% !important; height: auto !important; }

/* === Index page hero (dark sumi panel — decks .dark variant) === */
.hero {
  position: relative;
  padding: 80px 48px 72px;
  margin: -32px -40px 48px;
  background: var(--color-dark);
  color: #e8e3d4;
  border-radius: 0;
  text-align: center;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(232, 227, 212, 0.04) 0%, transparent 60%);
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    135deg,
    rgba(232, 227, 212, 0.025) 0,
    rgba(232, 227, 212, 0.025) 1px,
    transparent 1px,
    transparent 16px
  );
  pointer-events: none;
}
.hero > * { position: relative; z-index: 1; }
.hero h1 {
  font-family: var(--font-serif);
  font-size: 56px;
  font-weight: 500;
  letter-spacing: 0.06em;
  margin: 0 0 12px;
  border: none;
  color: #f4f1e8;
  font-style: italic;
}
.hero-sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  font-style: normal;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(232, 227, 212, 0.55);
  margin-top: 8px;
}
.hero-tagline {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 20px;
  margin: 16px 0 20px;
  color: var(--color-shu);
  letter-spacing: 0.04em;
}
.hero-desc {
  max-width: 660px;
  margin: 0 auto 36px;
  color: rgba(232, 227, 212, 0.78);
  font-size: 14px;
  line-height: 1.95;
  font-weight: 300;
}
.stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-top: 36px;
}
.stat {
  background: rgba(232, 227, 212, 0.04);
  border: 1px solid rgba(232, 227, 212, 0.16);
  border-radius: var(--radius-lg);
  padding: 18px 26px;
  min-width: 100px;
  text-align: center;
}
.stat-num {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 500;
  font-style: italic;
  color: var(--color-shu);
  line-height: 1.1;
}
.stat-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(232, 227, 212, 0.6);
  margin-top: 6px;
}

.group-card {
  background: var(--color-bg-paper);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-link);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  padding: 28px 32px;
  margin: 0 0 24px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.18s, border-left-color 0.18s;
}
.group-card:hover {
  box-shadow: var(--shadow);
  border-left-color: var(--color-shu);
}
.group-card h2 {
  font-family: var(--font-serif);
  font-weight: 500;
  letter-spacing: 0.04em;
  margin: 0 0 18px;
  padding: 0;
  font-size: 20px;
  border: none;
  color: var(--color-text);
}
.group-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 10px;
}
.group-card ul a {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  transition: all 0.15s;
}
.group-card ul a:hover {
  background: var(--color-accent-soft);
  border-color: var(--color-link);
  text-decoration: none;
  transform: translateX(2px);
}
.doc-title {
  display: block;
  font-family: var(--font-serif);
  font-weight: 500;
  color: var(--color-text);
  font-size: 14px;
  letter-spacing: 0.02em;
}
.doc-path {
  display: block;
  font-size: 11px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  margin-top: 4px;
  letter-spacing: 0.02em;
}

/* === Footer === */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 32px;
  text-align: center;
  font-family: var(--font-serif);
  font-size: 13px;
  font-style: italic;
  color: var(--color-text-muted);
  background: var(--color-bg-soft);
  letter-spacing: 0.04em;
}

/* === Responsive === */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    padding: 20px 24px;
  }
  .main { padding: 24px 20px 80px; }
  .toc ul { columns: 1; }
  .hero { padding: 56px 24px 48px; margin: -24px -20px 32px; }
  .hero h1 { font-size: 38px; }
  .hero-tagline { font-size: 17px; }
  .group-card { padding: 22px; }
  .group-card ul { grid-template-columns: 1fr; }
  .stat { padding: 14px 18px; }
  .stat-num { font-size: 30px; }
}