/* ── Variables ──────────────────────────────────────────────── */

:root {
  --bg:            #F8F8F6;
  --text:          #181816;
  --muted:         #6A6A66;
  --faint:         #A0A09A;
  --border:        #E4E4E0;
  --header-bg:     #222220;
  --header-text:   #F0F0EC;
  --header-muted:  #9A9A96;
  --accent:        #3A3A38;
  --tag-bg:        #EAEAE6;
  --tag-text:      #4A4A46;
}

[data-theme="dark"] {
  --bg:            #0C0C0B;
  --text:          #E4E4DE;
  --muted:         #888882;
  --faint:         #555550;
  --border:        #262624;
  --header-bg:     #1A1A18;
  --header-text:   #E4E4DE;
  --header-muted:  #686864;
  --accent:        #C8C8C0;
  --tag-bg:        #222220;
  --tag-text:      #AAAAAA;
}


/* ── Reset ──────────────────────────────────────────────────── */

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

html { font-size: 16px; }


/* ── Base ───────────────────────────────────────────────────── */

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica Neue, Arial, sans-serif;
  line-height: 1.7;
  transition: background-color 0.2s ease, color 0.2s ease;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--text);
  text-decoration-color: var(--border);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.15s;
}
a:hover { text-decoration-color: var(--muted); }


/* ── Header ─────────────────────────────────────────────────── */

.site-header {
  background-color: var(--header-bg);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.site-header.scrolled {
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.35);
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-name {
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--header-text);
  text-decoration: none;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  font-size: 0.82rem;
  color: var(--header-muted);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color 0.15s;
}
.nav-links a:hover  { color: var(--header-text); }
.nav-links a.active { color: var(--header-text); }


/* ── Theme toggle ───────────────────────────────────────────── */

.theme-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--header-muted);
  padding: 2px;
  display: flex;
  align-items: center;
  line-height: 1;
  transition: color 0.15s;
}
.theme-btn:hover { color: var(--header-text); }

.theme-btn .icon-sun  { display: none; }
.theme-btn .icon-moon { display: block; }

[data-theme="dark"] .theme-btn .icon-sun  { display: block; }
[data-theme="dark"] .theme-btn .icon-moon { display: none; }


/* ── Footer ─────────────────────────────────────────────────── */

footer {
  border-top: 1px solid var(--border);
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 32px;
}

.footer-text {
  font-size: 0.76rem;
  color: var(--faint);
}


/* ── Index page ─────────────────────────────────────────────── */

.page-content {
  max-width: 760px;
  margin: 0 auto;
  padding: 56px 32px 100px;
}

.tagline {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
  margin-bottom: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border);
}

.post-list {
  display: flex;
  flex-direction: column;
}

.post-item {
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
}
.post-item:first-child { padding-top: 0; }

.post-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.post-date {
  font-size: 0.76rem;
  color: var(--faint);
  letter-spacing: 0.02em;
}

.post-tag {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--tag-text);
  background: var(--tag-bg);
  padding: 2px 6px;
  border-radius: 2px;
}

.post-title {
  font-size: 1.22rem;
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.015em;
  margin-bottom: 10px;
}

.post-title a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.15s;
}
.post-title a:hover { color: var(--muted); }

.post-excerpt {
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.62;
  margin-bottom: 14px;
}

.post-readmore {
  font-size: 0.78rem;
  color: var(--faint);
  text-decoration: none;
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color 0.15s;
}
.post-readmore:hover { color: var(--muted); }

.post-readmore .arrow { transition: transform 0.15s; }
.post-readmore:hover .arrow { transform: translateX(3px); }

.post-item.featured .post-title    { font-size: 1.5rem; }
.post-item.featured .post-excerpt  { font-size: 0.95rem; }


/* ── Article page ───────────────────────────────────────────── */

.page-body {
  max-width: 900px;
  margin: 0 auto;
  padding: 48px 32px 80px;
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 0 60px;
}

/* Scoped to .page-body to avoid colliding with index page h1/h2/p */
.page-body > article { min-width: 0; }

.page-body > article .article-meta {
  font-size: 0.76rem;
  color: var(--faint);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 14px;
  display: flex;
  gap: 16px;
}

.page-body > article .article-meta .tag {
  color: var(--accent);
  font-weight: 600;
}

.page-body > article h1 {
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 24px;
}

.page-body > article .lede {
  font-size: 1.06rem;
  line-height: 1.66;
  color: var(--text);
  margin-bottom: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

.page-body > article p {
  font-size: 0.97rem;
  margin-bottom: 20px;
}

.page-body > article h2 {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 38px 0 14px;
}


/* ── Sidebar ─────────────────────────────────────────────────── */

aside { padding-top: 4px; }

.sidebar-section { margin-bottom: 40px; }

.sidebar-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.sidebar-posts {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.sidebar-posts li a {
  font-size: 0.84rem;
  color: var(--muted);
  text-decoration: none;
  line-height: 1.4;
  display: block;
}
.sidebar-posts li a:hover { color: var(--text); }

.sidebar-posts .post-date {
  font-size: 0.72rem;
  color: var(--faint);
  margin-top: 2px;
}

.sidebar-about {
  font-size: 0.84rem;
  color: var(--muted);
  line-height: 1.6;
}