/* ===== First rule: Google Fonts ===== */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600;700&family=IBM+Plex+Serif:wght@400;500&family=Inter:wght@400;500;600;700&family=Noto+Sans+JP:wght@400;500;700&display=swap');

/* ===== Monaspace Neon ===== */
@font-face {
  font-family: 'Monaspace Neon';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('https://cdn.jsdelivr.net/gh/githubnext/monaspace@v1.101/fonts/webfonts/MonaspaceNeon-Regular.woff2') format('woff2');
}
@font-face {
  font-family: 'Monaspace Neon';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('https://cdn.jsdelivr.net/gh/githubnext/monaspace@v1.101/fonts/webfonts/MonaspaceNeon-Medium.woff2') format('woff2');
}
@font-face {
  font-family: 'Monaspace Neon';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('https://cdn.jsdelivr.net/gh/githubnext/monaspace@v1.101/fonts/webfonts/MonaspaceNeon-Bold.woff2') format('woff2');
}

/* ===== Source Serif 4 Variable (playground) ===== */
@font-face {
  font-family: 'Source Serif 4 Variable';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('/fonts/SourceSerif4-VariableFont_opsz,wght.ttf') format('truetype');
}

/* ===== Base ===== */
body {
  font-family: var(--font-sans), 'Noto Sans JP', sans-serif;
  background: var(--bg);
  color: var(--fg);
  max-width: 880px;
  margin: 0 auto;
  padding: 24px 20px 64px;
  line-height: 1.55;
  font-size: 14px;
}

a {
  color: var(--c-data-blue);
}

/* ===== Header ===== */
header {
  display: flex;
  align-items: center;
  gap: 24px;
  border-bottom: 3px solid var(--border-strong);
  padding-bottom: 16px;
  margin-bottom: 32px;
}

.ds-site-link {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--fg-strong);
  text-decoration: none;
  letter-spacing: var(--tracking-tight);
}

header nav {
  display: flex;
  gap: 20px;
  margin-left: auto;
}

header nav a {
  color: var(--fg-secondary);
  text-decoration: none;
  font-size: 13px;
}

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

header .ds-btn {
  margin-left: auto;
}

header nav + .ds-btn {
  margin-left: auto;
}

/* テーマ切替ボタンは控えめに（一覧の邪魔をしない） */
#themeToggle {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 6px 10px;
  cursor: pointer;
}
#themeToggle:hover {
  color: var(--fg-secondary);
  background: var(--bg-panel);
  border-color: var(--border);
}
#themeToggle:focus-visible {
  outline: none;
  box-shadow: 0 0 0 1.5px var(--c-data-blue), 0 0 0 calc(1.5px + 2px) var(--bg);
}

/* ===== Footer ===== */
footer {
  margin-top: 64px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
}

.ds-footer-stamp,
footer span {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
}

/* ===== Focus ring ===== */
:focus-visible {
  outline: none;
  box-shadow:
    0 0 0 1.5px var(--c-data-blue),
    0 0 0 calc(1.5px + 2px) var(--bg);
}

/* ===== Page titles ===== */
.page-title {
  font-family: var(--font-serif);
  color: var(--fg-strong);
  font-size: var(--t-h2);
  margin: 0 0 24px;
}

.section-title {
  font-family: var(--font-serif);
  color: var(--fg-strong);
  font-size: var(--t-h3);
  margin: 0 0 16px;
}

/* ===== Home sections ===== */
.home-section {
  margin-top: 40px;
}

/* ===== Post list rows ===== */
.post-list {
  display: flex;
  flex-direction: column;
}

.post-row {
  display: flex;
  gap: 16px;
  align-items: baseline;
  padding: 8px 0;
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
}

.post-row:last-child {
  border-bottom: none;
}

.post-row:hover .post-title {
  color: var(--c-data-blue);
}

.post-date {
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--fg-muted);
  width: 96px;
  flex-shrink: 0;
}

.post-title {
  color: var(--fg);
}

/* ===== Post article ===== */
article h1:first-of-type {
  font-family: var(--font-serif);
  color: var(--fg-strong);
  font-size: var(--t-h1);
  line-height: 1.15;
  margin: 0 0 8px;
}

.post-date-line {
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--fg-muted);
  margin: 0;
}

.post-updated {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-data-amber);
  margin: 4px 0 0;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 8px;
}

/* ===== Markdown body ===== */
.markdown-body {
  margin-top: 24px;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  font-family: var(--font-serif);
  color: var(--fg-strong);
  line-height: 1.25;
  margin: 1.5em 0 0.5em;
}

.markdown-body > h1:first-child {
  display: none;
}

.markdown-body p {
  margin: 0 0 1em;
}

.markdown-body code {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--bg-sunken);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 1px 5px;
}

.markdown-body pre {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 14px 16px;
  background: var(--bg-sunken);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow-x: auto;
  margin: 0 0 1em;
}

.markdown-body pre code {
  font-size: 12px;
  background: transparent;
  border: none;
  border-radius: inherit;
  padding: 0;
}

.markdown-body .shiki {
  background: transparent;
  border-radius: inherit;
}

/* shiki のインライン背景色（ライト固定）をダークモードで上書きする */
[data-theme="dark"] .shiki {
  background-color: var(--shiki-dark-bg, var(--bg-sunken)) !important;
  color: var(--shiki-dark, var(--fg)) !important;
}
[data-theme="dark"] .shiki span {
  color: var(--shiki-dark, var(--fg)) !important;
}

.markdown-body blockquote {
  border-left: 3px solid var(--border-strong);
  margin: 0 0 1em;
  padding-left: 16px;
  color: var(--fg-secondary);
}

.markdown-body a {
  color: var(--c-data-blue);
}

.markdown-body img {
  max-width: 100%;
  height: auto;
}

.markdown-body table {
  border-collapse: collapse;
  width: 100%;
  font-size: 13px;
  margin: 0 0 1em;
}

.markdown-body th,
.markdown-body td {
  border: 1px solid var(--border);
  padding: 6px 10px;
  text-align: left;
}

.markdown-body th {
  background: var(--bg-panel);
  color: var(--fg-strong);
  font-weight: 600;
}

.markdown-body hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 2em 0;
}

/* ===== Empty state ===== */
.empty-state {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
  text-align: center;
  padding: 64px 0;
}

/* ===== Playground ===== */
.playground h1 {
  font-family: var(--font-serif);
  color: var(--fg-strong);
  font-size: var(--t-h1);
  margin: 0 0 8px;
}

.playground p {
  color: var(--fg);
}

.sliders {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 24px 0;
  padding: 16px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.sliders label {
  display: flex;
  align-items: center;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-secondary);
}

.sliders input[type='range'] {
  flex: 1;
}

#readout {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-muted);
  margin: 0 0 16px;
}

#pv {
  font-family: 'Source Serif 4 Variable', serif;
  font-size: 48px;
  line-height: 1.1;
  color: var(--fg-strong);
  margin: 0;
}