/* デザイントークン: design spec のカラーテーブルをそのまま反映 */
:root {
  --zen-bg: #edf2ec;
  --zen-card: #f4f8f3;
  --zen-text: #2c3531;
  --zen-accent: #5f7244;
  --zen-muted: #7a877b;
  --zen-border: #dde4dd;
  --zen-code-leaf: #5f7244;
  --zen-code-charcoal: #2c3531;
  --zen-code-soil: #8b6b4a;
  --zen-font-serif: "Noto Serif JP", serif;
  --zen-font-sans: "Noto Sans JP", sans-serif;
  --zen-font-mono: "Fira Code", monospace;
}

[data-theme="dark"] {
  --zen-bg: #151915;
  --zen-card: #1d231d;
  --zen-text: #e2ece5;
  --zen-accent: #98b67d;
  --zen-muted: #8b9b8d;
  --zen-border: #2e3a2e;
  --zen-code-leaf: #98b67d;
  --zen-code-charcoal: #e2ece5;
  --zen-code-soil: #b99c77;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--zen-bg);
  color: var(--zen-text);
  font-family: var(--zen-font-sans);
  font-feature-settings: "palt";
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.4s ease, color 0.4s ease;
  padding-top: 3rem;
}

@media (min-width: 768px) {
  body {
    padding-top: 5rem;
  }
}

.zen-container {
  width: 100%;
  max-width: 42rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.zen-header {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 3rem;
}

.zen-mode-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  font-family: var(--zen-font-sans);
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  color: var(--zen-muted);
  transition: color 0.3s ease;
}

.zen-mode-btn:hover {
  color: var(--zen-text);
}

.zen-link {
  text-decoration: none;
  color: inherit;
  transition: opacity 0.3s ease;
}

.zen-link:hover {
  opacity: 0.7;
}

.zen-tags {
  display: flex;
  flex-wrap: wrap;
  column-gap: 1.5rem;
  row-gap: 0.75rem;
  margin-bottom: 4rem;
}

.zen-tag-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  font-family: var(--zen-font-sans);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--zen-muted);
  transition: color 0.3s ease;
}

.zen-tag-btn:hover {
  color: var(--zen-text);
}

.zen-tag-btn.is-active {
  color: var(--zen-accent);
  text-decoration: underline;
  text-underline-offset: 8px;
}

.zen-article-list {
  padding-bottom: 6rem;
}

.zen-article {
  margin-bottom: 3rem;
}

.zen-article:last-child {
  margin-bottom: 0;
}

.zen-article-title {
  margin: 0 0 0.5rem;
  font-family: var(--zen-font-serif);
  font-size: 1.0625rem;
  font-weight: 400;
  color: var(--zen-text);
}

.zen-article-date {
  font-size: 0.5625rem;
  letter-spacing: 0.2em;
  color: var(--zen-muted);
}

.zen-detail {
  padding-bottom: 6rem;
}

.zen-back-link {
  display: inline-block;
  margin-bottom: 4rem;
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  color: var(--zen-muted);
}

.zen-back-link:hover {
  color: var(--zen-text);
}

.zen-detail-header {
  margin-bottom: 3rem;
}

.zen-detail-title {
  margin: 0 0 1rem;
  font-family: var(--zen-font-serif);
  font-size: 1.5rem;
  color: var(--zen-text);
}

.zen-detail-date {
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  color: var(--zen-muted);
}

.zen-article-body {
  font-family: var(--zen-font-serif);
  font-size: 15px;
  line-height: 2.1;
  color: var(--zen-text);
}

.zen-article-body p + p {
  margin-top: 2rem;
}

.zen-article-body pre {
  font-family: var(--zen-font-mono);
  font-size: 13px;
  color: var(--zen-code-charcoal);
  background-color: var(--zen-card);
  border: 1px solid var(--zen-border);
  border-radius: 4px;
  padding: 1rem;
  overflow-x: auto;
}

.zen-article-body code {
  font-family: var(--zen-font-mono);
}