/* yysk.dev — design system
   - デザイントークン (light / dark)。OS 設定に追従しつつ data-theme で手動上書き
   - フォント: M PLUS 1 Code (0/O・1/l が区別できる日本語対応ファミリー) 1 書体で統一
   - 依存なし。PC = 2 ペイン固定、SP = スライドインドロワー */

/* ---- tokens ---- */
:root {
  color-scheme: light dark;
  --font: "M PLUS 1 Code", "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif;

  --c-bg: #f6f7f9;
  --c-surface: #ffffff;
  --c-surface-2: #eceef2;
  --c-text: #1b2430;
  --c-muted: #616d7a;
  --c-border: #dfe3e9;
  --c-border-strong: #b6bfca;
  --c-accent: #0f766e;
  --c-accent-soft: rgba(15, 118, 110, 0.1);
  --c-scrim: rgba(15, 20, 28, 0.4);
  --shadow-card: 0 1px 2px rgba(15, 20, 28, 0.07);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --c-bg: #0d1117;
  --c-surface: #151b23;
  --c-surface-2: #1e2630;
  --c-text: #e6e9ec;
  --c-muted: #8d97a2;
  --c-border: #28303b;
  --c-border-strong: #414c59;
  --c-accent: #2dd4bf;
  --c-accent-soft: rgba(45, 212, 191, 0.13);
  --c-scrim: rgba(2, 4, 8, 0.6);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --c-bg: #0d1117;
    --c-surface: #151b23;
    --c-surface-2: #1e2630;
    --c-text: #e6e9ec;
    --c-muted: #8d97a2;
    --c-border: #28303b;
    --c-border-strong: #414c59;
    --c-accent: #2dd4bf;
    --c-accent-soft: rgba(45, 212, 191, 0.13);
    --c-scrim: rgba(2, 4, 8, 0.6);
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.5);
  }
}

/* ---- base ---- */
@view-transition {
  navigation: auto;
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--c-border-strong) transparent;
}

::selection {
  background: color-mix(in srgb, var(--c-accent) 28%, transparent);
}

:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
}

body {
  display: flex;
  width: 100%;
  overflow: hidden;
  background: var(--c-bg);
  color: var(--c-text);
}

a {
  color: var(--c-accent);
}

.skip-link {
  position: absolute;
  left: 8px;
  top: 8px;
  z-index: 100;
  padding: 8px 14px;
  border-radius: 8px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  color: var(--c-text);
  text-decoration: none;
  transform: translateY(-300%);
}

.skip-link:focus {
  transform: none;
}

/* ---- wordmark ---- */
.wordmark {
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: -0.02em;
  color: var(--c-text);
  text-decoration: none;
  white-space: nowrap;
}

.wordmark::after {
  content: "_";
  color: var(--c-accent);
  margin-left: 1px;
  animation: caret 1.3s steps(2, jump-none) infinite;
}

@keyframes caret {
  50% { opacity: 0; }
}

/* ---- sidebar ---- */
nav#sidebar {
  width: var(--sidebar-w, 262px);
  min-width: 190px;
  max-width: 40vw;
  resize: horizontal;
  overflow-y: auto;
  height: 100%;
  flex-shrink: 0;
  padding: 1.15rem 0.95rem 1rem;
  box-sizing: border-box;
  background: var(--c-surface);
  border-right: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  z-index: 10;
}

.nav-label {
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-muted);
  margin: 1.35rem 0 0.4rem 0.3rem;
}

/* tree */
.tree-nav {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.9rem;
}

.tree-nav ul {
  list-style: none;
  margin: 0 0 0 0.62rem;
  padding-left: 0.72rem;
  border-left: 1px solid var(--c-border);
}

.tree-nav li {
  margin: 1px 0;
}

.tree-nav a {
  display: block;
  padding: 3px 9px;
  border-radius: 7px;
  color: var(--c-text);
  text-decoration: none;
}

.tree-nav a:hover {
  background: var(--c-surface-2);
  color: var(--c-accent);
}

.tree-nav a[aria-current="page"] {
  background: var(--c-accent-soft);
  color: var(--c-accent);
  font-weight: 600;
}

.tree-nav summary {
  display: flex;
  align-items: center;
  padding: 3px 6px 3px 4px;
  border-radius: 7px;
  color: var(--c-muted);
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.tree-nav summary::-webkit-details-marker {
  display: none;
}

.tree-nav summary::before {
  content: "▸";
  font-size: 0.66rem;
  width: 1.1em;
  flex-shrink: 0;
  color: var(--c-muted);
  transition: transform 0.15s;
}

.tree-nav details[open] > summary::before {
  transform: rotate(90deg);
}

.tree-nav details[open] > summary {
  color: var(--c-text);
}

.tree-nav summary:hover {
  background: var(--c-surface-2);
}

.tree-nav summary a {
  flex: 1;
  padding: 0;
  border-radius: 0;
  color: inherit;
}

.tree-nav summary a:hover {
  background: none;
  color: var(--c-accent);
}

.tree-nav .count {
  margin-left: auto;
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--c-muted);
  background: var(--c-surface-2);
  padding: 0 7px;
  border-radius: 99px;
}

/* sidebar footer */
.nav-foot {
  margin-top: auto;
  padding-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.map-entry {
  display: block;
  padding: 7px 11px;
  border: 1px solid var(--c-border);
  border-radius: 9px;
  color: var(--c-text);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
}

.map-entry span {
  color: var(--c-accent);
}

.map-entry:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.map-entry[aria-current="page"] {
  border-color: var(--c-accent);
  background: var(--c-accent-soft);
  color: var(--c-accent);
}

.theme-toggle {
  align-self: flex-start;
  border: none;
  background: none;
  color: var(--c-muted);
  font-family: var(--font);
  font-size: 0.78rem;
  padding: 4px 8px;
  margin-left: 2px;
  border-radius: 7px;
  cursor: pointer;
}

.theme-toggle:hover {
  color: var(--c-accent);
  background: var(--c-surface-2);
}

/* ---- mobile header / drawer ---- */
.mobile-header {
  display: none;
}

.scrim {
  position: fixed;
  inset: 0;
  background: var(--c-scrim);
  z-index: 35;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

@media (max-width: 768px) {
  body {
    flex-direction: column;
    overflow: auto;
    height: auto;
    min-height: 100dvh;
  }

  .mobile-header {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.65rem 1rem;
    border-bottom: 1px solid var(--c-border);
    background: color-mix(in srgb, var(--c-bg) 84%, transparent);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 30;
  }

  .mobile-header .wordmark {
    flex: 1;
  }

  .mobile-header .theme-toggle {
    font-size: 1rem;
    padding: 2px 8px;
  }

  .hamburger {
    background: none;
    border: none;
    color: var(--c-text);
    font-size: 1.45rem;
    cursor: pointer;
    padding: 0 2px;
    line-height: 1;
    width: 1.4em;
  }

  nav#sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(80vw, 300px);
    max-width: none;
    height: 100dvh;
    resize: none;
    border-right: 1px solid var(--c-border);
    transform: translateX(-105%);
    transition: transform 0.22s ease;
    z-index: 40;
  }

  nav#sidebar.open {
    transform: none;
    box-shadow: 12px 0 32px rgba(0, 0, 0, 0.25);
  }

  .scrim.show {
    opacity: 1;
    pointer-events: auto;
  }

  html.drawer-open,
  html.drawer-open body {
    overflow: hidden;
  }

  main {
    height: auto;
    overflow: visible;
  }
}

/* ---- main ---- */
main {
  flex-grow: 1;
  height: 100%;
  overflow-y: auto;
  padding: 2.6rem clamp(1.2rem, 5vw, 4rem) 2rem;
  box-sizing: border-box;
}

.container-width {
  max-width: 76ch;
}

/* ---- article header ---- */
.article-header {
  margin-bottom: 2.2rem;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--c-border);
}

.article-header h1 {
  font-size: clamp(1.65rem, 3.5vw, 2.05rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin: 0.2rem 0 0.3rem;
}

body.home .article-header h1 {
  font-size: clamp(2.3rem, 6vw, 3.1rem);
}

.subtitle {
  color: var(--c-muted);
  margin: 0 0 0.7rem;
  font-size: 0.98rem;
}

.breadcrumb {
  font-size: 0.8rem;
  color: var(--c-muted);
  margin: 0 0 0.2rem;
}

.breadcrumb a {
  color: inherit;
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--c-accent);
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0;
}

.chip {
  display: inline-block;
  font-size: 0.74rem;
  color: var(--c-muted);
  background: var(--c-surface-2);
  border: 1px solid var(--c-border);
  padding: 2px 10px;
  border-radius: 99px;
  text-decoration: none;
}

a.chip:hover {
  color: var(--c-accent);
  border-color: var(--c-accent);
}

/* ---- prose ---- */
.prose {
  font-size: 0.97rem;
  line-height: 1.9;
}

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

.prose h1 {
  font-size: 1.5rem;
  margin: 2.2rem 0 0.9rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.prose h2 {
  font-size: 1.28rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 2.5rem 0 0.9rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--c-border);
  position: relative;
}

.prose h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 2.4rem;
  height: 2px;
  background: var(--c-accent);
  border-radius: 2px;
}

.prose h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.8rem 0 0.6rem;
}

.prose h4,
.prose h5,
.prose h6 {
  font-size: 1rem;
  font-weight: 600;
  margin: 1.4rem 0 0.5rem;
}

.prose p {
  margin: 0 0 1rem;
}

.prose ul,
.prose ol {
  margin: 0 0 1rem;
  padding-left: 1.5rem;
}

.prose li {
  margin-bottom: 0.3rem;
}

.prose li::marker {
  color: var(--c-muted);
}

.prose a {
  color: var(--c-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.prose a:hover {
  text-decoration-thickness: 2px;
}

.prose code {
  background: var(--c-surface-2);
  border: 1px solid var(--c-border);
  padding: 0.1em 0.4em;
  border-radius: 5px;
  font-family: var(--font);
  font-size: 0.86em;
}

.prose pre {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 10px;
  padding: 1rem 1.15rem;
  overflow-x: auto;
  font-size: 0.84rem;
  line-height: 1.65;
  margin: 1.4rem 0;
  box-shadow: var(--shadow-card);
}

.prose pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
}

.prose blockquote {
  border-left: 3px solid var(--c-accent);
  margin: 1.4rem 0;
  padding: 0.1rem 0 0.1rem 1rem;
  color: var(--c-muted);
}

.prose hr {
  border: none;
  border-top: 1px solid var(--c-border);
  margin: 2.2rem 0;
}

.prose table {
  display: block;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 1.4rem 0;
  font-size: 0.9rem;
}

.prose th,
.prose td {
  border-bottom: 1px solid var(--c-border);
  padding: 0.5rem 1rem 0.5rem 0;
  text-align: left;
}

.prose th {
  color: var(--c-muted);
  font-weight: 600;
  font-size: 0.8rem;
  border-bottom: 1px solid var(--c-border-strong);
}

.prose img {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  border: 1px solid var(--c-border);
}

/* ---- lists (folder index / recent) ---- */
.section-label,
.page-links h2 {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-muted);
  margin: 2.6rem 0 0.5rem;
}

.simple-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--c-border);
}

.list-item {
  display: flex;
  align-items: baseline;
  gap: 1.1rem;
  padding: 0.58rem 0.3rem;
  border-bottom: 1px solid var(--c-border);
  text-decoration: none;
  color: var(--c-text);
}

.list-item:hover {
  background: var(--c-accent-soft);
}

.list-item .date {
  width: 6.4em;
  flex-shrink: 0;
  color: var(--c-muted);
  font-size: 0.8rem;
}

.list-item .title {
  flex-grow: 1;
  font-weight: 500;
}

.list-item:hover .title {
  color: var(--c-accent);
}

.list-item .category {
  flex-shrink: 0;
  font-size: 0.74rem;
  color: var(--c-muted);
}

@media (max-width: 520px) {
  .list-item {
    flex-wrap: wrap;
    gap: 0.2rem 1.1rem;
  }

  .list-item .title {
    order: -1;
    flex-basis: 100%;
  }
}

/* ---- backlinks / map link / footer ---- */
.page-links ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
}

.page-links a {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--c-text);
  border: 1px solid var(--c-border);
  background: var(--c-surface);
  padding: 4px 12px;
  border-radius: 99px;
  text-decoration: none;
}

.page-links a:hover {
  color: var(--c-accent);
  border-color: var(--c-accent);
}

.map-link {
  margin-top: 2.2rem;
  font-size: 0.85rem;
}

.map-link a {
  color: var(--c-muted);
  text-decoration: none;
}

.map-link a span {
  color: var(--c-accent);
}

.map-link a:hover {
  color: var(--c-accent);
}

.empty-message {
  color: var(--c-muted);
  font-style: italic;
  padding: 1rem 0;
}

.site-footer {
  margin-top: 4rem;
  padding: 1.1rem 0 0.4rem;
  border-top: 1px solid var(--c-border);
  color: var(--c-muted);
  font-size: 0.76rem;
}

.site-footer a {
  color: inherit;
}

.site-footer a:hover {
  color: var(--c-accent);
}

/* ---- 関係図 (/map/) ---- */
body.map-page main {
  padding: 0;
  overflow: hidden;
  display: flex;
}

.map-wrap {
  position: relative;
  flex-grow: 1;
  height: 100%;
}

.map-frame {
  width: 100%;
  height: 100%;
  background: var(--c-bg);
}

.map-frame svg {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: grab;
}

.map-frame svg.dragging {
  cursor: grabbing;
}

.map-controls {
  position: absolute;
  top: 12px;
  right: 12px;
  display: flex;
  gap: 6px;
  z-index: 2;
}

.map-controls button {
  border: 1px solid var(--c-border);
  background: var(--c-surface);
  color: var(--c-text);
  padding: 4px 11px;
  border-radius: 8px;
  font-size: 13px;
  font-family: var(--font);
  cursor: pointer;
  box-shadow: var(--shadow-card);
}

.map-controls button:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.map-legend {
  position: absolute;
  left: 12px;
  bottom: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  z-index: 2;
  max-width: calc(100% - 24px);
}

.map-legend button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--c-border);
  background: var(--c-surface);
  color: var(--c-text);
  padding: 3px 11px;
  border-radius: 99px;
  font-size: 12px;
  font-family: var(--font);
  cursor: pointer;
  box-shadow: var(--shadow-card);
}

.map-legend button:hover {
  border-color: var(--hue);
}

.map-legend .dot {
  width: 8px;
  height: 8px;
  border-radius: 99px;
  background: var(--hue);
}

.map-grid {
  stroke: var(--c-border);
  stroke-width: 1;
  opacity: 0.55;
}

.map-edge-g {
  opacity: 0.78;
  transition: opacity 0.15s;
}

.map-edge {
  fill: none;
  stroke: var(--c-border-strong);
  stroke-width: 1.5;
  transition: stroke 0.15s, stroke-width 0.15s;
}

.map-arrow {
  fill: var(--c-border-strong);
  stroke: none;
  transition: fill 0.15s;
}

svg.focus-mode .map-edge-g {
  opacity: 0.08;
}

svg.focus-mode .map-edge-g.on {
  opacity: 1;
}

svg.focus-mode .map-edge-g.on .map-edge {
  stroke: var(--c-accent);
  stroke-width: 2.2;
}

svg.focus-mode .map-edge-g.on .map-arrow {
  fill: var(--c-accent);
}

.map-node {
  transition: opacity 0.15s;
}

svg.focus-mode .map-node.dim {
  opacity: 0.22;
}

.map-box {
  fill: color-mix(in srgb, var(--hue) 5%, transparent);
  stroke: color-mix(in srgb, var(--hue) 42%, var(--c-border));
  stroke-width: 1.5;
}

.map-box-dot {
  fill: var(--hue);
}

.map-box-label {
  fill: var(--c-text);
  font-family: var(--font);
  font-size: 19px;
  font-weight: 700;
  paint-order: stroke;
  stroke: var(--c-bg);
  stroke-width: 4;
}

/* 入れ子 (サブフォルダ) の box は控えめに */
.map-box-sub .map-box-label {
  font-size: 15px;
  stroke-width: 3;
}

a:hover > .map-box-label {
  fill: var(--c-accent);
}

.map-card {
  fill: var(--c-surface);
  stroke: var(--c-border-strong);
  stroke-width: 1.2;
}

a:hover > .map-card,
a:focus-visible > .map-card {
  stroke: var(--c-accent);
  stroke-width: 2;
}

.map-card-target > .map-card {
  stroke: var(--c-accent);
  stroke-width: 2.5;
  fill: color-mix(in srgb, var(--c-accent) 10%, var(--c-surface));
}

.map-card-title {
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  padding: 10px 13px;
  font-family: var(--font);
  font-size: 13.5px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--c-text);
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow-wrap: anywhere;
}

.map-empty {
  padding: 2rem;
  color: var(--c-muted);
}

@media (max-width: 768px) {
  body.map-page {
    height: 100dvh;
    overflow: hidden;
  }

  body.map-page main {
    height: auto;
    flex-grow: 1;
    min-height: 0;
  }
}

/* ---- motion ---- */
@media (prefers-reduced-motion: reduce) {
  .wordmark::after {
    animation: none;
  }

  nav#sidebar,
  .scrim,
  .map-edge-g,
  .map-edge,
  .map-arrow,
  .map-node,
  .tree-nav summary::before {
    transition: none;
  }

  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation: none;
  }
}

/* ---- print ---- */
@media print {
  nav#sidebar,
  .mobile-header,
  .scrim,
  .map-link,
  .site-footer {
    display: none;
  }

  body {
    display: block;
    overflow: visible;
  }

  main {
    width: 100%;
    height: auto;
    padding: 0;
    overflow: visible;
  }
}