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

/* ── Theme variables ─────────────────────────────────────── */

/* Light mode: clear spring day (default) */
:root {
  --text:      #1c3a4a;
  --muted:     #6a92a8;
  --border:    #b8d8e8;
  --surface:   rgba(255, 255, 255, 0.82);
  --accent:    #1a7aad;
  --tag-bg:    #deeef8;
  --tag-color: #1a5a7a;
  --dim:       #e8f3fa;
  --glow:      none;
  --shadow:    0 2px 10px rgba(0, 80, 130, 0.08);
}

/* Dark mode: calm night sky */
[data-theme="dark"] {
  --text:      #c5dce8;
  --muted:     #4a7a98;
  --border:    #25445c;
  --surface:   #162638;
  --accent:    #6bbde0;
  --tag-bg:    #1a3350;
  --tag-color: #6bbde0;
  --dim:       #1a3048;
  --glow:      0 0 10px rgba(107, 189, 224, 0.3);
  --shadow:    0 2px 10px rgba(0, 0, 0, 0.3);
}

/* ── Base ────────────────────────────────────────────────── */
html {
  min-height: 100%;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background:
    linear-gradient(175deg,
      #a8d4e8 0%,
      #c5e4f3 18%,
      #ddeef8 42%,
      #eef6fb 68%,
      #f7fbfe 100%
    ) fixed;
  background-color: #f7fbfe;
}

[data-theme="dark"] body {
  background: #0c1a28;
}

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

/* ── Header / Nav ────────────────────────────────────────── */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 0.75rem 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

[data-theme="dark"] .site-header {
  background: rgba(22, 38, 56, 0.95);
}

.site-nav {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-title {
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--accent);
  letter-spacing: 0.04em;
}
.site-title:hover { text-decoration: none; opacity: 0.8; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-links a {
  font-size: 0.82rem;
  color: var(--muted);
  text-decoration: none;
  font-weight: 500;
}
.nav-links a:hover { color: var(--accent); text-decoration: none; }

/* ── Theme toggle button ─────────────────────────────────── */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: inherit;
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  cursor: pointer;
  border-radius: 4px;
  line-height: 1.4;
}
.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* ── Content wrapper ─────────────────────────────────────── */
.content {
  max-width: 800px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
}

/* ── Home header ─────────────────────────────────────────── */
.home-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.home-header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  margin: 0 0 0.35rem;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.tagline {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0;
}

/* ── Post list ───────────────────────────────────────────── */
.post-list { display: flex; flex-direction: column; gap: 0.9rem; }

.post-summary {
  border: 1px solid var(--border);
  background: var(--surface);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  padding: 1.1rem 1.4rem;
  border-radius: 8px;
  box-shadow: var(--shadow);
  transition: box-shadow 0.15s, border-color 0.15s;
}
.post-summary:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 16px rgba(0, 80, 130, 0.12);
}
[data-theme="dark"] .post-summary:hover {
  box-shadow: 0 4px 16px rgba(107, 189, 224, 0.12);
}

.post-summary h2 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.2rem;
}

.post-summary h2 a {
  color: var(--text);
  text-decoration: none;
}
.post-summary h2 a:hover { color: var(--accent); }

.post-meta {
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 0.3rem;
}

.description {
  font-size: 0.88rem;
  color: var(--muted);
  margin: 0.25rem 0 0;
  line-height: 1.5;
}

/* ── Single post ─────────────────────────────────────────── */
.post-header {
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1.25rem;
}

.post-title {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.3;
  margin: 0 0 0.5rem;
  color: var(--accent);
}

.post-tags { margin-left: 0.5rem; }

.tag {
  display: inline-block;
  background: var(--tag-bg);
  color: var(--tag-color);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.73rem;
  padding: 0.05rem 0.45rem;
  text-decoration: none;
  margin-right: 0.25rem;
}
.tag:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

/* Post body typography */
.post-content {
  color: var(--text);
}

.post-content h2 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-top: 2.25rem;
  margin-bottom: 0.6rem;
  color: var(--accent);
  letter-spacing: 0.01em;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.3rem;
}

.post-content ul { padding-left: 1.5rem; list-style: none; }
.post-content ul li::before { content: '–'; color: var(--muted); margin-left: -1.25rem; margin-right: 0.4rem; }
.post-content li { margin-bottom: 0.5rem; }

.post-content a { color: var(--accent); }
.post-content a:hover { text-decoration: underline; }

.post-content strong { color: var(--text); font-weight: 600; }

.post-content code {
  font-family: 'SF Mono', Menlo, 'Courier New', monospace;
  font-size: 0.88em;
  background: var(--dim);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.1em 0.35em;
}

.post-content pre {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem;
  overflow-x: auto;
  box-shadow: var(--shadow);
}
.post-content pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.88em;
}

/* ── Copy button ─────────────────────────────────────────── */
.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  width: 1.6rem;
  height: 1.6rem;
  padding: 0.25rem;
  background: none;
  border: 1px solid transparent;
  border-radius: 4px;
  cursor: pointer;
  transition: border-color 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.copy-btn svg { width: 100%; height: 100%; stroke: var(--muted); fill: none; }
.copy-btn:hover { border-color: var(--border); }
.copy-btn:hover svg, .copy-btn.copied svg { stroke: var(--accent); }

/* ── Entry link buttons ──────────────────────────────────── */
.entry-link-btn {
  display: inline-flex;
  align-items: center;
  vertical-align: middle;
  width: 0.9rem;
  height: 0.9rem;
  margin-left: 0.35rem;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s;
}
.post-content p:hover .entry-link-btn,
.post-content li:hover .entry-link-btn { opacity: 1; }
.entry-link-btn svg { width: 100%; height: 100%; stroke: var(--muted); fill: none; }
.entry-link-btn:hover svg, .entry-link-btn.copied svg { stroke: var(--accent); }

@media (hover: none) {
  .entry-link-btn { opacity: 1; width: 1.2rem; height: 1.2rem; padding: 0.15rem; }
}

/* ── Post navigation ─────────────────────────────────────── */
.post-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}
.post-nav a { color: var(--accent); }

/* ── List page ───────────────────────────────────────────── */
.list-header h1 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--accent);
}

/* ── Tags page ───────────────────────────────────────────── */
.terms-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
}

/* ── Footer ──────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  padding: 1.25rem 1.5rem;
  text-align: center;
  font-size: 0.78rem;
  color: var(--muted);
}

/* ── Pagination ──────────────────────────────────────────── */
.pagination {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 2rem;
  font-size: 0.85rem;
}
.pagination a { color: var(--accent); }

/* ── Nav search ──────────────────────────────────────────── */
.nav-search { display: flex; align-items: center; }

.nav-search input {
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  color: var(--text);
  font-family: inherit;
  font-size: 0.82rem;
  padding: 0.1rem 0.25rem;
  width: 14ch;
  outline: none;
  line-height: 1.4;
}
.nav-search input::placeholder { color: var(--muted); }
.nav-search input:focus { border-bottom-color: var(--accent); }

/* ── Search results page ─────────────────────────────────── */
.search-status {
  min-height: 1.4em;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.search-result {
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
}
.search-result h3 { margin: 0 0 0.3rem; font-size: 1rem; }
.search-result h3 a { color: var(--text); }
.search-result h3 a:hover { color: var(--accent); }

.search-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.4rem;
  font-size: 0.78rem;
  color: var(--muted);
}

.search-snippet { margin: 0; font-size: 0.88rem; color: var(--muted); }
.search-empty { color: var(--muted); }

/* ── Holiday banner ──────────────────────────────────────── */
.holiday-banner {
  margin-bottom: 1.75rem;
  padding: 0.75rem 1rem;
  background: var(--dim);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.85rem;
  color: var(--muted);
}

.holiday-banner--featured {
  border-color: var(--accent);
  color: var(--accent);
}

.hb-row { display: flex; align-items: center; gap: 0.5rem; }
.hb-pipe { display: none; }
.hb-pipe-right { display: none; }

.hb-inner {
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 600px) {
  body { font-size: 15px; }
  .post-title { font-size: 1.3rem; }
  .nav-search input { width: 8ch; }
}