/* ─── Variables ─────────────────────────────────────────────── */
:root {
  --bg:          #FFF1E0;
  --bg-rule:     #D6C4A8;
  --text:        #1A1A1A;
  --text-mid:    #4A3F30;
  --text-light:  #7A6A58;
  --accent:      #B30000;
  --border:      #C9B99A;
  --font-head:   'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-body:   'EB Garamond', Georgia, 'Times New Roman', serif;
  --font-ui:     'Libre Franklin', 'Helvetica Neue', Arial, sans-serif;
  --max-w:       720px;
  --wide-w:      1100px;
}

/* ─── Reset & Base ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 18px; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* ─── Typography ────────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text);
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}
a:hover { border-bottom-color: var(--accent); }

p { margin-bottom: 1.3em; }
p:last-child { margin-bottom: 0; }

blockquote {
  border-left: 3px solid var(--border);
  margin: 2em 0;
  padding: 0.5em 1.5em;
  color: var(--text-mid);
  font-style: italic;
  font-size: 1.05em;
}

code {
  font-family: 'Courier New', monospace;
  font-size: 0.85em;
  background: rgba(0,0,0,0.05);
  padding: 0.1em 0.35em;
  border-radius: 2px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5em 0;
}

/* ─── Layout Wrapper ────────────────────────────────────────── */
.container {
  width: 90%;
  max-width: var(--max-w);
  margin: 0 auto;
}

.container--wide {
  width: 90%;
  max-width: var(--wide-w);
  margin: 0 auto;
}

/* ─── Site Header ───────────────────────────────────────────── */
.site-header {
  border-bottom: 2px solid var(--text);
  padding: 2rem 0 1.25rem;
}

.site-header__inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.site-title {
  font-family: var(--font-head);
  font-size: 1.9rem;
  letter-spacing: 0.03em;
  color: var(--text);
  border-bottom: none;
}
.site-title:hover { border-bottom: none; }

.site-nav {
  display: flex;
  gap: 1.5rem;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.site-nav a {
  color: var(--text);
  border-bottom: none;
}
.site-nav a:hover {
  color: var(--accent);
  border-bottom: none;
}

/* ─── Quote Bar ─────────────────────────────────────────────── */
.quote-bar {
  border-bottom: 1px solid var(--border);
  padding: 1.1rem 0;
  background: rgba(0,0,0,0.018);
}

.quote-bar__text {
  font-family: var(--font-body);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--text-mid);
  text-align: center;
  letter-spacing: 0.01em;
}

.quote-bar__text cite {
  display: block;
  font-style: normal;
  font-family: var(--font-ui);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 0.3em;
  color: var(--text-light);
}

/* ─── Home Sections ─────────────────────────────────────────── */
.home-section {
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--border);
}
.home-section:last-of-type { border-bottom: none; }

.section-label {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-light);
  margin-bottom: 1.6rem;
}

/* About */
.about-text {
  font-size: 1.08rem;
  max-width: 600px;
  color: var(--text-mid);
}

/* Articles list */
.articles-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.articles-list li {
  border-top: 1px solid var(--border);
  padding: 1.2rem 0;
}
.articles-list li:last-child { border-bottom: 1px solid var(--border); }

.article-entry__title {
  font-family: var(--font-head);
  font-size: 1.15rem;
  margin-bottom: 0.2em;
}
.article-entry__title a {
  color: var(--text);
  border-bottom: none;
}
.article-entry__title a:hover { color: var(--accent); border-bottom: none; }

.article-entry__meta {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-light);
  margin-bottom: 0.5em;
}

.article-entry__excerpt {
  font-size: 0.95rem;
  color: var(--text-mid);
  max-width: 580px;
}

/* Other section */
.other-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.5rem;
}

.other-item__label {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-light);
  margin-bottom: 0.4em;
}

.other-item__link {
  font-family: var(--font-head);
  font-size: 0.98rem;
  color: var(--text);
}

/* ─── Site Footer ───────────────────────────────────────────── */
.site-footer {
  border-top: 2px solid var(--text);
  padding: 1.5rem 0;
  margin-top: 2rem;
}

.site-footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-family: var(--font-ui);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--text-light);
}

/* ─── Article Page ──────────────────────────────────────────── */
.article-page {
  padding: 3rem 0 5rem;
}

.article-back {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-light);
  border-bottom: none;
  display: inline-block;
  margin-bottom: 2.5rem;
}
.article-back:hover { color: var(--accent); border-bottom: none; }
.article-back::before { content: '← '; }

.article-header { margin-bottom: 2rem; }

.article-header__title {
  font-size: clamp(1.75rem, 4vw, 2.6rem);
  margin-bottom: 0.6em;
  line-height: 1.15;
}

.article-header__subtitle {
  font-family: var(--font-body);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--text-mid);
  margin-bottom: 1.1em;
}

.article-header__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-family: var(--font-ui);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-light);
}

.article-divider {
  border: none;
  border-top: 2px solid var(--text);
  margin: 1.8rem 0 2.5rem;
}

/* Article body */
.article-body {
  font-size: 1.05rem;
  line-height: 1.8;
}

.article-body h2 {
  font-size: 1.45rem;
  margin: 2.5em 0 0.6em;
}

.article-body h3 {
  font-size: 1.15rem;
  margin: 2em 0 0.5em;
}

.article-body figure {
  margin: 2.5em 0;
  text-align: center;
}

.article-body figure figcaption {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--text-light);
  margin-top: 0.75em;
  font-style: normal;
}

.article-body .equation-block {
  overflow-x: auto;
  padding: 1.2em 0;
  text-align: center;
  margin: 1.5em 0;
}

.article-body ul,
.article-body ol {
  margin: 0 0 1.3em 1.4em;
}
.article-body li { margin-bottom: 0.35em; }

/* KaTeX display override */
.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.5em 0;
}

/* ─── Responsive ────────────────────────────────────────────── */
@media (max-width: 640px) {
  html { font-size: 16px; }

  .site-header__inner { flex-direction: column; gap: 0.5rem; }
  .site-nav { gap: 1rem; }

  .article-header__meta { gap: 0.75rem; }

  .other-grid { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 1000px) {
  .article-page .container { max-width: 680px; }
}