/* ============================================================
   Cyanote — design system
   Hexo-inspired reading layout, Yuque-inspired writing,
   global blue accent, dark / light themes.
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  --accent: #2563eb;
  --accent-2: #3b82f6;
  --accent-3: #60a5fa;
  --accent-soft: #dbeafe;
  --accent-strong: #1d4ed8;

  --bg: #f6f8fc;
  --bg-elev: #ffffff;
  --bg-soft: #eef2f8;
  --bg-code: #f4f7fd;
  --text: #1e2a3a;
  --text-2: #5b6b81;
  --text-3: #8b9bb1;
  --border: #e2e9f4;
  --border-soft: #ecf1f9;
  --shadow: 0 1px 2px rgba(30, 58, 138, 0.05), 0 8px 24px rgba(30, 58, 138, 0.08);
  --shadow-lg: 0 4px 12px rgba(30, 58, 138, 0.08), 0 20px 48px rgba(30, 58, 138, 0.12);
  --header-h: 60px;
  --radius: 12px;
  --radius-sm: 8px;
  --font-sans: 'Inter', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Segoe UI', system-ui, sans-serif;
  --font-serif: Georgia, 'Songti SC', 'SimSun', serif;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', Consolas, 'Courier New', monospace;
  color-scheme: light;
}

html[data-theme='dark'] {
  --accent: #3b82f6;
  --accent-2: #60a5fa;
  --accent-3: #93c5fd;
  --accent-soft: #16263f;
  --accent-strong: #60a5fa;

  --bg: #0b1220;
  --bg-elev: #101a2e;
  --bg-soft: #16223a;
  --bg-code: #0e1830;
  --text: #e6edf7;
  --text-2: #9db0cc;
  --text-3: #68789a;
  --border: #1f2d47;
  --border-soft: #182440;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.45), 0 20px 48px rgba(0, 0, 0, 0.5);
  color-scheme: dark;
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; background: var(--bg); }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.25s ease, color 0.25s ease;
}
/* wraps header + main + footer so the opening splash can bend the real page
   with one SVG displacement filter; the wrapper adds no visual styling */
#page-stage {
  display: flex;
  flex-direction: column;
  flex: 1 0 auto;
  width: 100%;
  min-height: 100vh;
}
img { max-width: 100%; }
a { color: var(--accent-2); text-decoration: none; }
a:hover { color: var(--accent-strong); }
::selection { background: var(--accent-2); color: #fff; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: color-mix(in srgb, var(--accent-2) 35%, transparent); border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-2); }
::-webkit-scrollbar-track { background: transparent; }

/* ambient background gradient blobs (light & dark) */
.bg-grid { display: none; }
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 500px at 85% -10%, color-mix(in srgb, var(--accent-2) 12%, transparent), transparent 60%),
    radial-gradient(800px 500px at -10% 20%, color-mix(in srgb, var(--accent-3) 10%, transparent), transparent 60%),
    var(--bg);
  transition: background 0.25s ease;
}

/* cursor-following light */
#cursor-glow {
  position: fixed;
  left: 0;
  top: 0;
  width: 380px;
  height: 380px;
  margin: -190px 0 0 -190px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 3;
  opacity: 0.9;
  background: radial-gradient(closest-side, color-mix(in srgb, var(--accent-2) 12%, transparent), transparent 68%);
  transition: opacity 0.3s ease;
  will-change: transform;
}
@media (pointer: coarse) {
  #cursor-glow { display: none; }
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-soft);
}
.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  height: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 19px; color: var(--text); letter-spacing: 0.2px; }
.brand:hover { color: var(--text); }
.brand-mark {
  width: 30px; height: 30px;
  display: grid; place-items: center;
  border-radius: 8px;
  color: #fff;
  font-family: var(--font-serif);
  font-size: 17px; font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  box-shadow: 0 4px 12px color-mix(in srgb, var(--accent-2) 40%, transparent);
}
.brand-name { background: linear-gradient(90deg, var(--text), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }

.site-nav { display: flex; align-items: center; gap: 4px; margin-left: 12px; flex: 1; }
.site-nav a {
  padding: 7px 12px;
  border-radius: 8px;
  color: var(--text-2);
  font-size: 14.5px;
  font-weight: 500;
  position: relative;
  transition: color 0.15s, background 0.15s;
}
.site-nav a:hover { color: var(--accent-2); background: var(--accent-soft); }
.site-nav a.active { color: var(--accent-2); font-weight: 700; }
.site-nav a.active::after {
  content: '';
  position: absolute;
  left: 12px; right: 12px; bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-3));
}
.site-nav .nav-editor {
  margin-left: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 4px 14px color-mix(in srgb, var(--accent-2) 35%, transparent);
}
.site-nav .nav-editor:hover { color: #fff; background: linear-gradient(135deg, var(--accent-strong), var(--accent)); }
.header-actions { display: flex; gap: 8px; }
.icon-btn {
  width: 38px; height: 38px;
  border: 1px solid var(--border);
  border-radius: 10px;
  display: grid; place-items: center;
  background: var(--bg-elev);
  color: var(--text-2);
  cursor: pointer;
  transition: all 0.15s;
}
.icon-btn:hover { color: var(--accent-2); border-color: var(--accent-2); transform: translateY(-1px); }

/* theme toggle: show sun in dark mode (click to go light) and moon in light */
html[data-theme='dark'] .icon-sun { display: block; }
html[data-theme='dark'] .icon-moon { display: none; }
html:not([data-theme='dark']) .icon-sun { display: none; }
html:not([data-theme='dark']) .icon-moon { display: block; }
/* "following the system" is the default state — hint it with a faint dot */
#theme-toggle { position: relative; }
#theme-toggle.auto::after {
  content: '';
  position: absolute;
  right: 5px; top: 5px;
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--accent-2);
  opacity: 0.55;
}
#future-toggle.on { color: #fff; border-color: transparent; background: linear-gradient(135deg, #6d28d9, var(--accent-2)); box-shadow: 0 0 16px color-mix(in srgb, var(--accent-2) 60%, transparent); }

/* ---------- Layout ---------- */
.site-main { flex: 1; width: 100%; max-width: 1120px; margin: 0 auto; padding: 32px 24px 64px; }
.layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 32px; align-items: start; }
.layout-main { min-width: 0; }

.page-head { margin: 8px 0 26px; }
.page-title {
  margin: 0 0 6px;
  font-size: 30px;
  font-weight: 800;
  letter-spacing: -0.3px;
  background: linear-gradient(90deg, var(--text) 30%, var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.page-desc { margin: 0; color: var(--text-2); font-size: 14.5px; }

/* ---------- Hero (home) ---------- */
.hero {
  position: relative;
  padding: 46px 44px 38px;
  margin: 4px 0 36px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: linear-gradient(160deg, var(--bg-elev), color-mix(in srgb, var(--bg-elev) 60%, var(--accent-soft)));
  box-shadow: var(--shadow);
  overflow: hidden;
}
.hero::after {
  content: '';
  position: absolute;
  right: -80px; top: -120px;
  width: 340px; height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent-2) 22%, transparent), transparent 70%);
  pointer-events: none;
}
.hero h1 {
  margin: 18px 0 10px;
  font-size: clamp(30px, 4.5vw, 46px);
  line-height: 1.2;
  font-weight: 850;
  letter-spacing: -0.8px;
}
.hero h1 .blue { color: var(--accent-2); }
.hero-sub { margin: 0 0 24px; max-width: 560px; color: var(--text-2); font-size: 15.5px; }

.hero-actions { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 14.5px; font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.18s;
  font-family: inherit;
}
.btn-primary { color: #fff; background: linear-gradient(135deg, var(--accent), var(--accent-2)); box-shadow: 0 6px 18px color-mix(in srgb, var(--accent-2) 38%, transparent); }
.btn-primary:hover { filter: brightness(1.08); transform: translateY(-1px); color: #fff; }
.btn-ghost { color: var(--text-2); border-color: var(--border); background: var(--bg-elev); }
.btn-ghost:hover { color: var(--accent-2); border-color: var(--accent-2); }
.btn-sm { padding: 6px 12px; font-size: 13px; border-radius: 8px; }

/* future style switch (home) */
.future-switch {
  display: inline-flex; align-items: center; gap: 10px;
  margin-left: 8px;
  padding: 8px 14px 8px 10px;
  border: 1px dashed color-mix(in srgb, var(--accent-2) 45%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent-soft) 55%, transparent);
  cursor: pointer;
  user-select: none;
  transition: all 0.2s;
}
.future-switch:hover { border-color: var(--accent-2); box-shadow: 0 0 14px color-mix(in srgb, var(--accent-2) 25%, transparent); }
.future-switch .switch-label { font-size: 13px; font-weight: 700; color: var(--accent-2); }
.switch {
  position: relative;
  width: 42px; height: 24px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--text-3) 30%, transparent);
  transition: background 0.2s;
  flex: none;
}
.switch::after {
  content: '';
  position: absolute;
  top: 3px; left: 3px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.25);
  transition: transform 0.2s;
}
.future-mode .future-switch .switch, .future-switch.active .switch { background: linear-gradient(90deg, #7c3aed, var(--accent-2)); }
.future-switch.active .switch::after, .future-mode .future-switch .switch::after { transform: translateX(18px); }

/* ---------- Section titles & cards ---------- */
.section-title {
  display: flex; align-items: center; gap: 10px;
  margin: 40px 0 20px;
  font-size: 19px; font-weight: 800;
  letter-spacing: -0.2px;
}
.section-title::before { content: ''; width: 5px; height: 20px; border-radius: 3px; background: linear-gradient(180deg, var(--accent), var(--accent-3)); }
.section-title .more-link { margin-left: auto; font-size: 13px; font-weight: 600; color: var(--text-3); }
.section-title .more-link:hover { color: var(--accent-2); }

.post-card {
  display: block;
  padding: 22px 24px;
  margin-bottom: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
  position: relative;
  overflow: hidden;
}
.post-card::before {
  content: '';
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent), var(--accent-3));
  opacity: 0;
  transition: opacity 0.2s;
}
.post-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--accent-2) 40%, var(--border)); }
.post-card:hover::before { opacity: 1; }
.post-card h3 { margin: 0 0 8px; font-size: 19px; font-weight: 750; letter-spacing: -0.2px; color: var(--text); }
.post-card:hover h3 { color: var(--accent-2); }
.post-card h3 a { color: inherit; }
.post-card-link { position: absolute; inset: 0; z-index: 1; }
.post-card h3 a, .post-card h3, .post-card .chip, .post-card .post-meta { position: relative; z-index: 2; }
.post-card .excerpt { margin: 0 0 12px; color: var(--text-2); font-size: 14.5px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.post-pin { display: inline-block; margin-right: 6px; padding: 1px 8px; border-radius: 6px; font-size: 11.5px; font-weight: 700; color: #fff; background: linear-gradient(135deg, var(--accent), var(--accent-3)); vertical-align: 3px; }
.post-meta { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; font-size: 12.5px; color: var(--text-3); }
.post-meta .dot::before { content: '·'; margin-right: 14px; color: var(--text-3); }
.post-meta .words { margin-left: auto; font-variant-numeric: tabular-nums; letter-spacing: 0.3px; }
.post-meta .words::before { content: '✎ '; opacity: 0.75; }
.chip {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 12px; font-weight: 600;
  color: var(--accent-2);
  background: color-mix(in srgb, var(--accent-soft) 65%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent-2) 22%, transparent);
  transition: all 0.15s;
}
.chip:hover { color: #fff; background: var(--accent-2); }
.chip-sm { padding: 1px 8px; font-size: 11.5px; }

/* ---------- Sidebar ---------- */
.sidebar { position: sticky; top: calc(var(--header-h) + 24px); display: flex; flex-direction: column; gap: 18px; }
.widget {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  box-shadow: var(--shadow);
  padding: 18px 20px;
}
.widget h4 { margin: 0 0 12px; font-size: 14.5px; font-weight: 800; display: flex; align-items: center; gap: 8px; }
.widget h4::before { content: ''; width: 4px; height: 14px; border-radius: 2px; background: linear-gradient(180deg, var(--accent), var(--accent-3)); }

/* Butterfly-style future-effect + stats widgets */
.future-widget .future-switch { margin: 2px 0 0; }
.future-widget .switch-label { min-width: 64px; }
.widget-note { margin: 10px 0 0; font-size: 12px; color: var(--text-3); line-height: 1.6; }
.conflict-note {
  margin-top: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 12px;
  line-height: 1.6;
  color: #b45309;
  background: color-mix(in srgb, #f59e0b 14%, transparent);
  border: 1px solid color-mix(in srgb, #f59e0b 40%, transparent);
}
html[data-theme='dark'] .conflict-note { color: #fbbf24; }
.conflict-note button {
  all: unset;
  cursor: pointer;
  font-weight: 700;
  color: #fff;
  background: var(--accent-2);
  border-radius: 6px;
  padding: 1px 8px;
  margin-left: 4px;
}
.conflict-note button:hover { background: var(--accent-strong); }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; text-align: center; }
.stat-cell { padding: 8px 2px; border-radius: 8px; background: color-mix(in srgb, var(--accent-soft) 45%, transparent); }
.stat-cell b { display: block; font-size: 17px; font-weight: 800; color: var(--accent-2); font-variant-numeric: tabular-nums; }
.stat-cell span { font-size: 11px; color: var(--text-3); }
.widget-list { list-style: none; margin: 0; padding: 0; }
.widget-list li { margin: 2px 0; }
.widget-list a {
  display: flex; justify-content: space-between; align-items: center;
  padding: 6px 8px;
  border-radius: 7px;
  color: var(--text-2);
  font-size: 13.5px;
}
.widget-list a:hover { background: var(--accent-soft); color: var(--accent-2); }
.widget-list .count { font-size: 11.5px; color: var(--text-3); background: var(--bg-soft); border-radius: 999px; padding: 0 8px; }
.widget-list a:hover .count { color: var(--accent-2); background: color-mix(in srgb, var(--accent-2) 12%, transparent); }

.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-cloud a {
  padding: 3px 11px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--accent-2);
  border: 1px solid color-mix(in srgb, var(--accent-2) 25%, transparent);
  background: color-mix(in srgb, var(--accent-soft) 45%, transparent);
  transition: all 0.15s;
}
.tag-cloud a:hover { color: #fff; background: var(--accent-2); transform: translateY(-1px); }
.tag-cloud a.s1 { font-size: 11.5px; } .tag-cloud a.s2 { font-size: 12.5px; } .tag-cloud a.s3 { font-size: 13.5px; } .tag-cloud a.s4 { font-size: 14.5px; font-weight: 700; }

/* ---------- Pagination ---------- */
.pagination { display: flex; justify-content: center; align-items: center; gap: 8px; margin: 30px 0 10px; }
.pagination a, .pagination span {
  min-width: 36px; height: 36px;
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0 10px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text-2);
  font-size: 13.5px; font-weight: 600;
  transition: all 0.15s;
}
.pagination a:hover { border-color: var(--accent-2); color: var(--accent-2); transform: translateY(-1px); }
.pagination .current { color: #fff; background: linear-gradient(135deg, var(--accent), var(--accent-2)); border-color: transparent; }
.pagination .disabled { opacity: 0.4; pointer-events: none; }

/* ---------- Article page ---------- */
.article {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  box-shadow: var(--shadow);
  padding: 40px 44px 34px;
}
.article-header { margin-bottom: 26px; padding-bottom: 22px; border-bottom: 1px solid var(--border-soft); }
.article-title { margin: 0 0 12px; font-size: clamp(24px, 3.4vw, 34px); font-weight: 850; line-height: 1.3; letter-spacing: -0.5px; }
.article-cover { border-radius: var(--radius); overflow: hidden; margin: 20px 0 4px; border: 1px solid var(--border-soft); }
.article-cover img { display: block; width: 100%; }

.article-body { font-size: 16px; line-height: 1.9; color: var(--text); word-wrap: break-word; }
.article-body h1, .article-body h2, .article-body h3, .article-body h4 {
  line-height: 1.4; letter-spacing: -0.3px; margin: 1.6em 0 0.7em; font-weight: 800;
}
.article-body h1 { font-size: 1.55em; }
.article-body h2 {
  font-size: 1.35em;
  padding-left: 12px;
  border-left: 4px solid var(--accent-2);
  background: linear-gradient(90deg, color-mix(in srgb, var(--accent-soft) 55%, transparent), transparent 70%);
  border-radius: 0 8px 8px 0;
}
.article-body h3 { font-size: 1.18em; }
.article-body p { margin: 0.9em 0; }
.article-body a { border-bottom: 1px dashed color-mix(in srgb, var(--accent-2) 55%, transparent); }
.article-body a:hover { border-bottom-style: solid; }
.article-body img { border-radius: 10px; box-shadow: var(--shadow); margin: 6px 0; }
.article-body blockquote {
  margin: 1.1em 0;
  padding: 4px 18px;
  border-left: 4px solid var(--accent-2);
  border-radius: 0 10px 10px 0;
  background: color-mix(in srgb, var(--accent-soft) 40%, transparent);
  color: var(--text-2);
}
.article-body blockquote p { margin: 0.5em 0; }
.article-body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 2px 7px;
  border-radius: 6px;
  background: var(--bg-code);
  border: 1px solid var(--border-soft);
  color: var(--accent-2);
}
.article-body pre {
  position: relative;
  margin: 1.2em 0;
  padding: 18px 18px 18px;
  border-radius: 12px;
  border: 1px solid #23304a;
  background: #0d1526;
  overflow-x: auto;
  line-height: 1.65;
  box-shadow: var(--shadow);
}
.article-body pre code { background: none; border: none; padding: 0; color: #dbe7ff; font-size: 13.5px; }
.article-body pre::before {
  content: attr(data-lang);
  position: absolute; top: 8px; right: 12px;
  font-size: 10.5px; font-weight: 700;
  letter-spacing: 1px; text-transform: uppercase;
  color: #5a7bb0;
}
.article-body ul, .article-body ol { padding-left: 1.6em; }
.article-body li { margin: 0.35em 0; }
.article-body table { border-collapse: collapse; width: 100%; margin: 1.2em 0; font-size: 14.5px; }
.article-body th, .article-body td { border: 1px solid var(--border); padding: 9px 13px; text-align: left; }
.article-body th { background: var(--bg-soft); font-weight: 700; }
.article-body tr:nth-child(even) td { background: color-mix(in srgb, var(--bg-soft) 55%, transparent); }
.article-body hr { border: none; height: 1px; margin: 2em 0; background: var(--border); }
.article-body input[type='checkbox'] { accent-color: var(--accent-2); }
.article-body .token.tag .token.attr-value, .article-body .token.attr-value { color: #7ee787; }
.article-body .token.selector { color: #c297ff; }
.article-body .token.function { color: #79c0ff; }
.article-body .token.string { color: #a5d6ff; }
.article-body .token.keyword { color: #ff7b72; }
.article-body .token.comment { color: #8b949e; font-style: italic; }
.article-body .token.number { color: #79c0ff; }

.toc {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  box-shadow: var(--shadow);
  padding: 16px 18px;
}
.toc h4 { margin: 0 0 8px; font-size: 13px; font-weight: 800; color: var(--text-3); letter-spacing: 1px; }
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc a {
  display: block;
  padding: 4px 8px;
  color: var(--text-2);
  font-size: 13px;
  border-radius: 6px;
  line-height: 1.4;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  border-left: 2px solid transparent;
}
.toc a:hover { color: var(--accent-2); background: var(--accent-soft); }
.toc .lvl-3 { padding-left: 22px; }
.toc .active { color: var(--accent-2); border-left-color: var(--accent-2); background: color-mix(in srgb, var(--accent-soft) 60%, transparent); }

/* single sticky column for TOC + sidebar widgets (no double-stick overlap) */
.article-side {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  display: flex;
  flex-direction: column;
  gap: 18px;
  max-height: calc(100vh - var(--header-h) - 48px);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
}
.article-side .sidebar { position: static; }

/* headings stop below the sticky header when scrolled to via TOC */
.article-body h1, .article-body h2, .article-body h3, .article-body h4 { scroll-margin-top: calc(var(--header-h) + 24px); }

/* ---------- Categories / Tags / Archive ---------- */
.cat-group, .year-group { margin-bottom: 34px; }
.cat-group-head, .year-group-head {
  display: flex; align-items: baseline; gap: 10px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--border-soft);
  font-size: 17px; font-weight: 800;
}
.cat-group-head .count, .year-group-head .count { font-size: 12.5px; font-weight: 600; color: var(--accent-2); }
.year-group-head { font-size: 22px; }
.month-block { margin: 0 0 22px 6px; }
.month-title { font-size: 15px; font-weight: 800; color: var(--accent-2); margin: 0 0 10px; display: flex; align-items: center; gap: 8px; }
.month-title::after { content: ''; flex: 1; height: 1px; background: var(--border-soft); }
.archive-item { display: flex; gap: 12px; align-items: baseline; padding: 7px 10px; border-radius: 8px; }
.archive-item:hover { background: var(--bg-soft); }
.archive-item time { color: var(--text-3); font-size: 12.5px; font-variant-numeric: tabular-nums; font-family: var(--font-mono); flex: none; }
.archive-item a { color: var(--text-2); font-size: 14.5px; }
.archive-item a:hover { color: var(--accent-2); }

.tags-hero { display: flex; flex-wrap: wrap; gap: 12px; padding: 26px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-elev); box-shadow: var(--shadow); margin-bottom: 30px; }
.tags-hero a { padding: 7px 18px; font-size: 15px; }

/* ---------- Explore cards (home) ---------- */
.explore-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.explore-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 20px 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  box-shadow: var(--shadow);
  color: var(--text);
  transition: all 0.2s;
}
.explore-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--accent-2) 45%, var(--border)); color: var(--text); }
.explore-card b { font-size: 16px; }
.explore-card small { color: var(--text-3); font-size: 12.5px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.explore-ico { font-size: 22px; }
body.future-mode .explore-card { background: linear-gradient(165deg, rgba(23,33,64,0.72), rgba(10,16,36,0.82)); backdrop-filter: blur(12px); border-color: rgba(96,165,250,0.22); }
body.future-mode .explore-card:hover { border-color: rgba(34,211,238,0.55); box-shadow: 0 0 0 1px rgba(124,58,237,0.3), 0 22px 60px rgba(59,130,246,0.35); }

/* ---------- List toolbar (posts page) ---------- */
.list-toolbar { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }
.list-search {
  flex: 1;
  min-width: 200px;
  padding: 9px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-elev);
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.list-search:focus { border-color: var(--accent-2); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-2) 18%, transparent); }
.sidebar-col { display: flex; flex-direction: column; gap: 18px; }
.field-select {
  padding: 7px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elev);
  color: var(--text);
  font-family: inherit;
  font-size: 13px;
  outline: none;
  cursor: pointer;
}
kbd {
  font-family: var(--font-mono);
  font-size: 10.5px;
  padding: 1px 5px;
  border-radius: 5px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text-3);
  margin-left: 4px;
}

/* ---------- Dissolving teaser (home latest posts) ----------
   The next article is not faded out, it is eaten away: js/dissolve.js builds a
   noise mask that breaks the card body into grains, and a canvas field carries
   those grains upward. The CTA floats in the resulting mist. */
.dissolve-wrap {
  position: relative;
  height: 224px;
  margin-bottom: 18px;
  border-radius: var(--radius);
  overflow: hidden;
  isolation: isolate;
}
.dissolve-card { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.dissolve-card .post-card {
  height: auto;
  margin: 0;
  box-shadow: none;
  overflow: visible;
  padding-bottom: 48px;
  /* faint light welling up from the lower edge: as the mask eats through it,
     the surviving grains read as the card turning into glowing dust */
  background:
    radial-gradient(66% 58% at 50% 106%, color-mix(in srgb, var(--accent-2) 24%, transparent), transparent 70%),
    linear-gradient(180deg, var(--bg-elev) 42%, color-mix(in srgb, var(--accent-2) 10%, var(--bg-elev)) 100%);
}
.dissolve-card .post-card::before { opacity: 0 !important; }

/* soft breath of the page colour, so the dissolving tail melts into the layout
   and the pill keeps a readable stage (kept below the motes) */
.dissolve-haze {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 62%;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(180deg, transparent 52%, color-mix(in srgb, var(--bg) 30%, transparent) 80%, color-mix(in srgb, var(--bg) 76%, transparent) 100%),
    radial-gradient(54% 44% at 50% 106%, color-mix(in srgb, var(--accent-2) 14%, transparent), transparent 74%);
}
.dissolve-motes {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: block;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
.dissolve-link {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 62%;
  z-index: 3;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 13px;
}
.dissolve-cta {
  padding: 9px 22px;
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 750;
  letter-spacing: 0.2px;
  color: var(--accent-2);
  background: color-mix(in srgb, var(--bg-elev) 82%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent-2) 34%, var(--border));
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: color 0.22s, background 0.22s, border-color 0.22s, transform 0.22s, box-shadow 0.22s;
}
.dissolve-link:hover .dissolve-cta,
.dissolve-link:focus-visible .dissolve-cta {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 10px 30px color-mix(in srgb, var(--accent-2) 38%, transparent);
}
.dissolve-link:focus-visible { outline: none; }
.dissolve-link:focus-visible .dissolve-cta {
  outline: 2px solid color-mix(in srgb, var(--accent-2) 70%, transparent);
  outline-offset: 3px;
}
@media (prefers-reduced-motion: reduce) {
  .dissolve-cta { transition: none; }
}

/* ---------- States ---------- */
.empty { text-align: center; padding: 60px 20px; color: var(--text-3); }
.empty .emoji { font-size: 40px; display: block; margin-bottom: 10px; }
.loading { text-align: center; padding: 50px; color: var(--text-3); }
.loading::after { content: ''; display: inline-block; width: 22px; height: 22px; margin-left: 10px; border-radius: 50%; border: 3px solid var(--border); border-top-color: var(--accent-2); animation: spin 0.8s linear infinite; vertical-align: -5px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border-soft); background: color-mix(in srgb, var(--bg-elev) 70%, transparent); margin-top: 24px; }
.footer-inner { max-width: 1120px; margin: 0 auto; padding: 26px 24px; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; font-size: 13px; color: var(--text-3); }
.footer-inner strong { color: var(--accent-2); }
.footer-meta { letter-spacing: 0.5px; }

/* ---------- Sidebar: 公告栏 / 友情链接 ---------- */
.widget-md { font-size: 13.5px; line-height: 1.75; }
.widget-md > :first-child { margin-top: 0; }
.widget-md > :last-child { margin-bottom: 0; }
.widget-md h1, .widget-md h2, .widget-md h3, .widget-md h4 { font-size: 1.05em; margin: 0.6em 0 0.35em; border: none; padding: 0; }
.widget-md p { margin: 0.45em 0; }
.widget-md pre { max-height: 220px; overflow: auto; }
.widget-md img { max-width: 100%; border-radius: 8px; }
.friend-links-widget .widget-list li { display: flex; flex-direction: column; gap: 1px; }
.friend-links-widget .fl-desc { font-size: 12px; color: var(--text-3); padding-left: 1px; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
  .article-side { position: static; max-height: none; overflow: visible; }
  .article { padding: 26px 20px 22px; }
  .hero { padding: 30px 22px 26px; }
}
@media (max-width: 640px) {
  .site-nav { gap: 0; overflow-x: auto; }
  .site-nav a { padding: 6px 8px; font-size: 13.5px; white-space: nowrap; }
  .site-nav .nav-editor { display: none; }
  .header-inner { padding: 0 14px; gap: 10px; }
  .site-main { padding: 20px 14px 48px; }
  .hero-stats { gap: 18px; }
}