/* ── TOKENS ── */
:root {
  --bg:      #f7f7f5;
  --fg:      #1c1c1e;
  --muted:   #6b7280;
  --border:  #d1d5db;
  --accent:  #1a6896;
  --surface: #eeede9;
}

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

html { font-size: 20px; }

body {
  font-family: 'Lexend Deca', sans-serif;
  background: var(--bg);
  color: var(--fg);
  min-height: 100vh;
  line-height: 1.6;
}

/* ── LAYOUT ── */
.page-wrap { max-width: 780px; margin: 0 auto; padding: 0 2rem; }

/* ── HEADER ── */
body > header {
  position: sticky; top: 0; z-index: 100;
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.header-inner {
  max-width: 900px; margin: 0 auto;
  padding: 1rem 2rem;
  display: flex; align-items: center; gap: 2rem;
}

.site-name  { font-size: 1.05rem; color: #1c1c1e; letter-spacing: 0.02em; text-decoration: none; }
.site-name:hover { color: var(--accent); }
.site-tagline { font-size: 0.65rem; color: #64748b; letter-spacing: 0.03em; margin-top: 0.15rem; }

nav { display: flex; gap: 1.8rem; margin-left: auto; }
nav a {
  font-size: 0.75rem; letter-spacing: 0.06em; color: rgba(0,0,0,0.38);
  text-decoration: none; padding: 0.35rem 0;
  border-bottom: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
nav a:hover, nav a.active { color: #1c1c1e; }
nav a.active { border-bottom-color: #475569; }

/* ── ANCHOR OFFSET (clears sticky nav) ── */
section[id] { scroll-margin-top: 5rem; }

/* ── SECTION LABEL ── */
.label {
  font-size: 0.65rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent);
  margin: 1.4rem 0 1rem;
  padding-left: 0.65rem;
  border-left: 2px solid var(--accent);
}

/* ── TYPOGRAPHY ── */
h1 { font-size: 1.4rem; font-weight: 400; letter-spacing: 0.02em; margin-bottom: 0.4rem; }
h2 { font-size: 1.1rem; font-weight: 400; margin-bottom: 0.35rem; }
h3 { font-size: 0.85rem; font-weight: 400; letter-spacing: 0.05em; color: var(--accent); margin-bottom: 0.3rem; }

p  { font-size: 0.85rem; line-height: 1.78; margin-bottom: 0.85rem; }
p:last-of-type { margin-bottom: 0; }

small { font-size: 0.68rem; color: var(--muted); }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--fg); }

/* ── CODE ── */
code {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78em;
  background: var(--surface);
  padding: 0.1em 0.4em;
  border: 1px solid var(--border);
}

pre {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem; line-height: 1.65;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1.2rem 1.4rem;
  overflow-x: auto;
  margin-bottom: 1.2rem;
}
pre code { background: none; border: none; padding: 0; font-size: inherit; }

/* ── BLOCKQUOTE / CALLOUT ── */
blockquote {
  margin: 1.2rem 0;
  padding: 0.9rem 1rem;
  border-left: 2px solid var(--border);
  background: var(--surface);
  font-size: 0.82rem; line-height: 1.72; color: var(--fg);
}

.callout {
  margin-top: 1.5rem; padding-top: 1.1rem;
  border-top: 1px solid var(--border);
  font-size: 0.68rem; line-height: 1.65; color: var(--muted);
}

/* ── SECTION BANNER ── */
.section-banner {
  width: 100%;
  height: 150px;
  object-fit: cover;
  object-position: center;
  display: block;
  border-radius: 3px;
  margin-bottom: 1rem;
}

/* ── POST LIST (blog index) ── */
.post-list { list-style: none; }
.post-list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
  transition: padding-left 0.2s, padding-right 0.2s,
              border-left 0.2s, border-right 0.2s,
              margin-left 0.2s, margin-right 0.2s;
}
.post-list li:first-child { border-top: 1px solid var(--border); }
.post-list li:hover {
  padding-left: 0.5rem;
  border-left: 2px solid var(--accent);
  margin-left: -2px;
}

/* even items: right-aligned */
.post-list li:nth-child(even) { text-align: right; }
.post-list li:nth-child(even):hover {
  padding-left: 0;
  padding-right: 0.5rem;
  border-left: none;
  margin-left: 0;
  border-right: 2px solid var(--accent);
  margin-right: -2px;
}

/* hidden posts + toggle */
.post-hidden { display: none; }
section.expanded .post-hidden { display: list-item; }

.show-more-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: 'Lexend Deca', sans-serif;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  background: none;
  border: 1px solid var(--border);
  padding: 0.4rem 1rem;
  cursor: pointer;
  margin-top: 0.5rem;
  transition: color 0.15s, border-color 0.15s;
}
.show-more-btn:hover { color: var(--accent); border-color: var(--accent); }

.post-title  { display: block; font-size: 0.9rem; line-height: 1.5; margin-bottom: 0.2rem; color: var(--fg); }
.post-title:hover { color: var(--accent); }
.post-meta   { display: block; font-size: 0.68rem; color: var(--muted); margin-bottom: 0.35rem; }
.post-preview { font-size: 0.78rem; color: var(--muted); line-height: 1.6; }

/* ── POST PAGE ── */
.back-link {
  position: sticky;
  top: 5.2rem;
  z-index: 91;
  background: var(--bg);
  display: flex; align-items: center; gap: 0.3rem;
  font-size: 0.68rem; letter-spacing: 0.06em;
  color: var(--muted);
  padding: 0.45rem 0;
  margin: 0.4rem 0 0;
  border-bottom: 1px solid var(--border);
}
.back-link:hover { color: var(--accent); }

.post-header {
  position: sticky;
  top: 7.5rem;
  z-index: 90;
  background: var(--bg);
  padding: 0.8rem 0 0.6rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}
.post-header .label { margin: 0 0 0.3rem; }
.post-header h1 { font-size: 1.5rem; margin-bottom: 0.3rem; }
.post-header .post-meta { font-size: 0.7rem; color: var(--muted); }

.post-body { padding-top: 0.5rem; padding-bottom: 4rem; }
.post-body p { font-size: 0.88rem; }
.post-body h2 { margin-top: 2rem; margin-bottom: 0.6rem; }
.post-body h3 { margin-top: 1.5rem; }

/* ── IMAGE PLACEHOLDER ── */
.img-placeholder {
  background: var(--surface);
  border: 1px dashed var(--border);
  padding: 3rem 1rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

/* ── IMAGE ── */
img { width: 100%; height: auto; display: block; }
.post-body img { margin-top: 1.8rem; margin-bottom: 0.5rem; }
.img-bordered { border: 1px solid var(--border); }
.img-caption  { font-size: 0.65rem; color: var(--muted); font-style: italic; margin-top: 0.5rem; margin-bottom: 0.9rem; text-align: center; }

/* ── IMAGE GRID ── */
.img-grid {
  display: grid;
  gap: 0.5rem;
  margin-top: 1.8rem;
  margin-bottom: 0.5rem;
}
.img-grid-2 { grid-template-columns: 1fr 1fr; }
.img-grid-3 { grid-template-columns: 1fr 1fr 1fr; }
.img-grid-4 { grid-template-columns: 1fr 1fr; }
.img-grid { align-items: start; }
.img-grid img { margin-top: 0; margin-bottom: 0; }
.img-grid .img-caption { margin-top: 0.3rem; margin-bottom: 0; }

/* ── BUTTON ── */
.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: 'Lexend Deca', sans-serif;
  font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--accent); background: none;
  border: 1px solid var(--border);
  padding: 0.5rem 1rem; cursor: pointer;
  transition: color 0.15s, border-color 0.2s;
}
.btn:hover { color: var(--fg); border-color: var(--accent); }

/* ── BACK TO TOP ── */
.back-to-top {
  position: fixed; bottom: 2rem; right: 2rem;
  opacity: 0; pointer-events: none;
  transition: opacity 0.25s;
}
.back-to-top.visible { opacity: 1; pointer-events: auto; }

/* ── DIVIDER ── */
hr { border: none; border-top: 1px solid var(--border); margin: 2.5rem 0; }

/* ── FOOTER ── */
footer { font-size: 0.68rem; letter-spacing: 0.05em; color: var(--muted); }
.footer-inner {
  max-width: 900px; margin: 0 auto;
  padding: 1.5rem 2rem;
  border-top: 1px solid var(--border);
  text-align: center;
}

/* ── COVER BANNER ── */
.cover-banner {
  padding-top: 0;
}
.cover-banner img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 3px;
  margin: 0;
}

/* ── HERO ── */
.hero {
  padding: 2.2rem 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.hero-text { flex: 1; }
.hero h1 { font-size: 1.6rem; margin-bottom: 0.6rem; }
.hero p { color: var(--muted); max-width: 500px; }
.hero .website-link {
  flex-shrink: 0;
  display: inline-flex; align-items: center; gap: 0.35rem;
  font-size: 0.7rem; letter-spacing: 0.07em;
  color: var(--accent);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.1rem;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
}
.hero .website-link:hover { color: var(--fg); border-color: var(--accent); }
@media (max-width: 600px) {
  .hero { flex-direction: column; align-items: flex-start; gap: 1rem; }
}

/* ── SCROLL REVEAL ── */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ── RESPONSIVE ── */
@media (max-width: 600px) {
  html { font-size: 17px; }
  .header-inner { padding: 0.9rem 1.2rem; flex-wrap: wrap; gap: 1rem; }
  .page-wrap { padding: 0 1.2rem; }
  nav { gap: 1.2rem; }
  .img-grid-3, .img-grid-4 { grid-template-columns: 1fr 1fr; }
}