/* =============================================
   YANJAA GANZORIG — BLOG
   Inspired by Dario Amodei's minimal aesthetic
   ============================================= */

:root {
  --bg:           #f9f7f4;
  --bg-subtle:    #f2efe9;
  --text:         #1a1916;
  --text-muted:   #7a7670;
  --accent:       #2d5a27;
  --accent-hover: #1e3d1b;
  --border:       #e0dbd3;
  --link:         #2d5a27;
  --max-width:    680px;
  --font-serif:   'Lora', Georgia, serif;
  --font-sans:    'Source Sans 3', system-ui, sans-serif;
}

[data-theme="dark"] {
  --bg:           #141210;
  --bg-subtle:    #1c1a17;
  --text:         #e8e4dc;
  --text-muted:   #7a7670;
  --accent:       #7db874;
  --accent-hover: #9dcf94;
  --border:       #2a2722;
  --link:         #7db874;
}

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

html {
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-weight: 300;
  line-height: 1.7;
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* ---- Layout ---- */
.site-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 4rem 1.5rem 6rem;
  width: 100%;
  animation: fadeUp 0.4s ease both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---- Header ---- */
.site-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background-color: var(--bg);
  z-index: 10;
  transition: background-color 0.2s ease;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.site-name {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
  flex: 1;
}

.site-name:hover { color: var(--accent); }

nav {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--text-muted);
  text-decoration: none;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  transition: color 0.15s;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: border-color 0.15s, color 0.15s;
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--text-muted);
  color: var(--text);
}

/* ---- Home: intro ---- */
.intro {
  margin-bottom: 3.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
}

.intro p {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ---- Post list ---- */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.post-item {
  padding: 1.8rem 0;
  border-bottom: 1px solid var(--border);
}

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

.post-date {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
  font-family: var(--font-sans);
}

.post-title {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  line-height: 1.4;
  margin-bottom: 0.5rem;
  transition: color 0.15s;
}

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

.post-summary {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
  max-width: 560px;
}

/* ---- Prose pages (About, Post) ---- */
.prose-page {
  max-width: 100%;
}

.page-title {
  font-family: var(--font-serif);
  font-size: 1.7rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.post-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.post-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.post-heading {
  font-family: var(--font-serif);
  font-size: 1.9rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--text);
}

/* ---- Prose body ---- */
.prose-page p {
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
  margin-bottom: 1.5rem;
}

.prose-page p em {
  color: var(--text);
}

.prose-page a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.15s;
}

.prose-page a:hover {
  color: var(--accent-hover);
}

/* ---- Post footer ---- */
.post-footer-nav {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.back-link {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color 0.15s;
}

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

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  text-align: center;
}

.site-footer p {
  font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

/* ---- Responsive ---- */
@media (max-width: 600px) {
  html { font-size: 16px; }

  .header-inner { gap: 1rem; }

  .post-heading { font-size: 1.5rem; }

  .main-content { padding: 2.5rem 1.2rem 4rem; }
}