/* pacific — Ngwg default theme.
   Quiet, cold, simple: fog, cold water, wide horizon.
   Light and dark palettes follow the system via prefers-color-scheme. */

:root {
  color-scheme: light dark;

  --bg: #f4f7f8;
  --surface: #fbfcfd;
  --ink: #2b3a42;
  --ink-soft: #5c6f78;
  --ink-faint: #8fa1a9;
  --line: #dde5e8;
  --accent: #38626f;
  --accent-soft: #e3edf0;
  --code-bg: #eef2f4;
  --content-width: 42rem;
  --sidebar-width: 13rem;
  --layout-width: 60rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1417;
    --surface: #121b1f;
    --ink: #c7d2d7;
    --ink-soft: #92a5ad;
    --ink-faint: #64767f;
    --line: #21313a;
    --accent: #74a9bd;
    --accent-soft: #16262e;
    --code-bg: #17242b;
  }
}

* { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
}

/* pjax swap: plain opacity fade on the content block (reduced-motion: off) */
.layout { transition: opacity 0.18s ease; }
.layout.pjax-fade { opacity: 0; }
@media (prefers-reduced-motion: reduce) {
  .layout { transition: none; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Georgia", "Songti SC", "Noto Serif CJK SC", "SimSun", serif;
  font-size: 1.0625rem;
  line-height: 1.85;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}
a:hover { border-bottom-color: currentColor; }

/* ---- header ---- */

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.site-nav {
  max-width: var(--layout-width);
  margin: 0 auto;
  padding: 1.1rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-title {
  font-size: 1.25rem;
  letter-spacing: 0.08em;
  color: var(--ink);
  border-bottom: none;
  white-space: nowrap;
  flex-shrink: 0;
}
.site-title:hover { color: var(--accent); }

.site-links {
  display: flex;
  gap: 1.4rem;
  flex-shrink: 0;
}

.site-links a {
  color: var(--ink-soft);
  font-size: 0.95rem;
  white-space: nowrap;
}
.site-links a:hover { color: var(--accent); }

/* hamburger — hidden unless the links do not fit (JS adds body.nav-crowded) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 2.2rem;
  height: 2.2rem;
  padding: 0 0.4rem;
  border: 1px solid var(--line);
  background: none;
  cursor: pointer;
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--ink-soft);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

body.nav-crowded .nav-toggle { display: flex; }
body.nav-crowded.menu-open .nav-toggle span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
body.nav-crowded.menu-open .nav-toggle span:nth-child(2) { opacity: 0; }
body.nav-crowded.menu-open .nav-toggle span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* collapsed dropdown menu */
body.nav-crowded .site-links {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  left: 0;
  flex-direction: column;
  gap: 0;
  padding: 0.4rem 1.25rem 0.8rem;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
body.nav-crowded .site-nav { position: relative; }
body.nav-crowded.menu-open .site-links { display: flex; }
body.nav-crowded .site-links a {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--line);
}
body.nav-crowded .site-links a:last-child { border-bottom: none; }

/* ---- layout: main + sidebar ---- */

.layout {
  max-width: var(--layout-width);
  margin: 0 auto;
  padding: 2.6rem 1.25rem 4rem;
  display: grid;
  grid-template-columns: minmax(0, var(--content-width)) var(--sidebar-width);
  gap: 3rem;
  align-items: start;
  min-height: calc(100vh - 16rem);
}

.page {
  max-width: var(--content-width);
  min-width: 0;
}

/* ---- sidebar (sticky: tags, categories and the TOC stay on screen) ---- */

.sidebar {
  font-size: 0.92rem;
  border-left: 1px solid var(--line);
  padding-left: 1.8rem;
  position: sticky;
  top: 1.4rem;
  max-height: calc(100vh - 2.8rem);
  overflow-y: auto;
}

.side-block { margin-bottom: 2rem; }

.side-title {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
  margin: 0 0 0.6rem;
}

.side-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.side-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.22rem 0;
}

.side-list a { border-bottom: none; color: var(--ink-soft); }
.side-list a:hover { color: var(--accent); }

.side-count {
  color: var(--ink-faint);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
}

/* ---- table of contents ---- */

.toc[hidden], .toc-fab[hidden] { display: none !important; }

.toc-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.toc-head .side-title { margin-bottom: 0; }

.toc-toggle {
  border: none;
  background: none;
  color: var(--ink-faint);
  cursor: pointer;
  font-size: 0.8rem;
  padding: 0 0.2rem;
}
.toc-toggle:hover { color: var(--accent); }

.toc.collapsed .toc-list { display: none; }
.toc.collapsed .toc-chevron { display: inline-block; transform: rotate(-90deg); }

.toc-list {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
  border-left: 2px solid var(--line);
}

.toc-item a {
  display: block;
  padding: 0.14rem 0 0.14rem 0.8rem;
  margin-left: -2px;
  border-left: 2px solid transparent;
  border-bottom: none;
  color: var(--ink-faint);
  font-size: 0.85rem;
  line-height: 1.55;
}
.toc-item a:hover { color: var(--accent); }
.toc-item.toc-h3 a { padding-left: 1.5rem; }
.toc-item.toc-h4 a { padding-left: 2.2rem; }

/* interval highlight: from the topmost visible section's heading through
   the bottommost one, everything in between stays highlighted too */
.toc-item.active > a {
  color: var(--accent);
  border-left-color: var(--accent);
}

/* floating button (narrow viewports) */
.toc-fab {
  display: none;
  position: fixed;
  right: 1.1rem;
  bottom: 1.4rem;
  z-index: 40;
  border: none;
  border-radius: 999px;
  padding: 0.55rem 1.05rem;
  background: var(--accent);
  color: var(--bg);
  font-size: 0.9rem;
  font-family: inherit;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(20, 40, 50, 0.25);
}

@media (max-width: 56rem) {
  .layout { grid-template-columns: 1fr; gap: 2.4rem; }
  .sidebar {
    order: 2;
    border-left: none;
    border-top: 1px solid var(--line);
    padding-left: 0;
    padding-top: 1.6rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
    gap: 1.6rem;
  }
  .side-block { margin-bottom: 0; }

  /* the TOC leaves the sidebar flow: floating button + popup panel */
  .toc-fab { display: flex; }
  .toc {
    position: fixed;
    left: 1rem;
    right: 1rem;
    bottom: 4.8rem;
    top: auto;
    z-index: 50;
    max-height: 55vh;
    overflow-y: auto;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 0.6rem;
    padding: 0.9rem 1.1rem;
    box-shadow: 0 10px 32px rgba(10, 25, 32, 0.28);
    display: none;
  }
  .toc.open { display: block; }
}

/* ---- page scaffold ---- */

.page-title {
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin: 0 0 0.2rem;
}

.page-subtitle {
  color: var(--ink-faint);
  font-size: 0.92rem;
  margin: 0 0 2.2rem;
}

/* ---- post list ---- */

.post-list { display: block; }

.post-item {
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--line);
}

.post-item-title {
  font-size: 1.22rem;
  font-weight: 600;
  margin: 0 0 0.35rem;
}
.post-item-title a { color: var(--ink); border-bottom: none; }
.post-item-title a:hover { color: var(--accent); }

.post-item-meta {
  color: var(--ink-faint);
  font-size: 0.86rem;
  display: flex;
  gap: 0.9rem;
  align-items: baseline;
}

.post-item-excerpt {
  color: var(--ink-soft);
  font-size: 0.96rem;
  margin: 0.55rem 0 0;
}
/* author-controlled excerpts (<!-- more -->) carry block-level HTML */
.post-item-excerpt p, .post-item-excerpt ul, .post-item-excerpt ol { margin: 0.3rem 0; }
.post-item-excerpt > :first-child { margin-top: 0; }
.post-item-excerpt > :last-child { margin-bottom: 0; }
.post-item-excerpt pre { font-size: 0.82rem; }

.tag, .category {
  font-size: 0.84rem;
  color: var(--ink-faint);
  border-bottom: none;
}
.tag:hover, .category:hover { color: var(--accent); }

/* ---- pagination ---- */

.pagination {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-top: 2.2rem;
  font-size: 0.92rem;
}

.pagination-info { color: var(--ink-faint); }

/* ---- single post ---- */

.post-page article { max-width: 100%; }

.post-header { margin-bottom: 2.4rem; }

.post-title {
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.4;
  margin: 0 0 0.5rem;
}

.post-meta {
  color: var(--ink-faint);
  font-size: 0.88rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.post-body {
  overflow-wrap: break-word;
}

.post-body h2, .post-body h3, .post-body h4 {
  font-weight: 600;
  line-height: 1.45;
  margin: 2.2rem 0 0.8rem;
}
.post-body h2 { font-size: 1.35rem; }
.post-body h3 { font-size: 1.15rem; }

.post-body p { margin: 0.9rem 0; }

.post-body blockquote {
  margin: 1.4rem 0;
  padding: 0.2rem 1.2rem;
  border-left: 3px solid var(--accent-soft);
  color: var(--ink-soft);
  background: var(--surface);
}

.post-body pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  padding: 1rem 1.2rem;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.6;
}

.post-body code {
  font-family: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  background: var(--code-bg);
  padding: 0.12em 0.35em;
  font-size: 0.88em;
}
.post-body pre code { background: none; padding: 0; }

.post-body img { max-width: 100%; display: block; margin: 1.4rem auto; }

.post-body hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 2.4rem 0;
}

.post-body ul, .post-body ol { padding-left: 1.6rem; }
.post-body li { margin: 0.3rem 0; }

.post-neighbors {
  margin-top: 3rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.94rem;
}
.neighbor.older { color: var(--ink-soft); }
.neighbor.newer { color: var(--ink-soft); text-align: right; }

/* ---- archives ---- */

.archive-group { margin-bottom: 2rem; }

.archive-year {
  font-size: 1.15rem;
  color: var(--accent);
  margin: 0 0 0.6rem;
}

.archive-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.archive-item {
  display: flex;
  gap: 1.2rem;
  align-items: baseline;
  padding: 0.28rem 0;
}
.archive-item time {
  color: var(--ink-faint);
  font-size: 0.86rem;
  font-variant-numeric: tabular-nums;
  min-width: 3.4rem;
}

/* ---- long-post segments ---- */

/* lazy-load marker: invisible on purpose, the loader watches it */
.post-seg-end { height: 1px; }

/* ---- footer ---- */

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--ink-faint);
  font-size: 0.85rem;
  text-align: center;
  padding: 2rem 1.25rem 2.6rem;
}
.site-footer p { margin: 0.25rem 0; }

@media (max-width: 480px) {
  body { font-size: 1rem; }
  .site-nav { padding: 1rem; }
  .layout { padding: 2rem 1rem 3rem; }
}