/* ====================================================
   Obsidian Blog — Modern Theme
   Dark-first with smooth light toggle.
   ==================================================== */

/* ---- Dark Palette (default) ---- */
:root {
  --bg:           #0d0d1a;
  --bg-alt:       #151528;
  --bg-elevated:  #1c1c32;
  --bg-glass:     rgba(13, 13, 26, 0.82);
  --text:         #e4e4f0;
  --text-muted:   #9494b8;
  --text-faint:   #5e5e82;
  --border:       #2a2a45;
  --accent:       #7c9bff;
  --accent-hover: #a0b8ff;
  --accent-dim:   rgba(124, 155, 255, 0.12);
  --accent-glow:  0 0 24px rgba(124, 155, 255, 0.08);
  --card-bg:      #18182b;
  --card-shadow:  0 4px 24px rgba(0, 0, 0, 0.25), 0 0 0 1px rgba(255, 255, 255, 0.03);
  --code-bg:      #111122;
  --code-text:    #e4e4f0;
  --tag-bg:       rgba(124, 155, 255, 0.13);
  --tag-text:     #7c9bff;
  --blockquote-border: #f0c06a;
  --blockquote-bg:    rgba(240, 192, 106, 0.06);
  --blockquote-text:  #d4b06a;
  --inline-code-bg:   rgba(124, 155, 255, 0.1);
  --inline-code-text: #7c9bff;
  --table-border: #2e2e4a;
  --table-head:   #1c1c32;
  --table-stripe: rgba(255, 255, 255, 0.015);
  --selection:    rgba(124, 155, 255, 0.25);
  --focus-ring:   rgba(124, 155, 255, 0.5);
  --hero-bg:      linear-gradient(135deg, #1c1c32 0%, #0d0d1a 60%);
  --scrollbar-bg: #151528;
  --scrollbar-thumb: #2e2e4a;

  /* Typography */
  --font-sans:    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-serif:   "Noto Serif SC", "Source Han Serif SC", Georgia, "Songti SC", serif;
  --font-mono:    "SF Mono", "Fira Code", "JetBrains Mono", "Consolas", monospace;

  /* Spacing */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;

  /* Layout */
  --max-width: 740px;
}

/* ---- Light Palette ---- */
body.light {
  --bg:           #f7f8fc;
  --bg-alt:       #eeeff5;
  --bg-elevated:  #ffffff;
  --bg-glass:     rgba(247, 248, 252, 0.85);
  --text:         #1a1b2e;
  --text-muted:   #6b6d8a;
  --text-faint:   #9a9cb5;
  --border:       #e2e4ed;
  --accent:       #4a6cf7;
  --accent-hover: #3451d6;
  --accent-dim:   rgba(74, 108, 247, 0.09);
  --accent-glow:  0 0 20px rgba(74, 108, 247, 0.06);
  --card-bg:      #ffffff;
  --card-shadow:  0 2px 12px rgba(0, 0, 0, 0.05), 0 0 0 1px rgba(0, 0, 0, 0.02);
  --code-bg:      #eeeff5;
  --code-text:    #1a1b2e;
  --tag-bg:       rgba(74, 108, 247, 0.08);
  --tag-text:     #4a6cf7;
  --blockquote-border: #d4a043;
  --blockquote-bg:    rgba(212, 160, 67, 0.05);
  --blockquote-text:  #7a5e28;
  --inline-code-bg:   rgba(74, 108, 247, 0.07);
  --inline-code-text: #4a6cf7;
  --table-border: #e2e4ed;
  --table-head:   #eeeff5;
  --table-stripe: rgba(0, 0, 0, 0.008);
  --selection:    rgba(74, 108, 247, 0.15);
  --focus-ring:   rgba(74, 108, 247, 0.4);
  --hero-bg:      linear-gradient(135deg, #ffffff 0%, #f7f8fc 60%);
  --scrollbar-bg: #f0f1f6;
  --scrollbar-thumb: #d0d2dd;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-track { background: var(--scrollbar-bg); }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }

::selection { background: var(--selection); }

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background 0.35s ease, color 0.35s ease;
}

/* ---- Theme Transition ---- */
body, body * {
  transition: background-color 0.35s ease,
              border-color 0.25s ease,
              box-shadow 0.25s ease,
              color 0.3s ease;
}

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

img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
}

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }

/* ====================================================
   Header
   ==================================================== */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg-glass);
  backdrop-filter: blur(14px) saturate(1.4);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  height: 3.75rem;
}

.site-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text) !important;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.site-nav { display: flex; gap: 1.25rem; flex: 1; }

.site-nav a {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.site-nav a:hover {
  color: var(--text);
  border-bottom-color: var(--accent);
}

/* ---- Theme Toggle ---- */
.theme-toggle {
  flex-shrink: 0;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s, background 0.2s;
  color: var(--text-muted);
  position: relative;
}
.theme-toggle:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
}
.theme-toggle:active {
  transform: scale(0.92);
}
.theme-toggle:active svg {
  transform: none;
}

/* Toggle SVG icons */
.theme-toggle svg {
  width: 1.1rem;
  height: 1.1rem;
  transition: transform 0.4s ease, opacity 0.25s ease;
}
#iconSun {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
#iconMoon {
  fill: currentColor;
  stroke: none;
}
#iconAuto {
  font-size: 0.65rem;
  font-weight: 700;
  font-family: var(--font-sans);
  opacity: 0.7;
  letter-spacing: 0;
  line-height: 1;
  transition: transform 0.4s ease, opacity 0.25s ease;
}

/* Icon visibility per mode */
body[data-theme="dark"] #iconSun,
body[data-theme="dark"] #iconAuto,
body[data-theme="light"] #iconMoon,
body[data-theme="light"] #iconAuto,
body[data-theme="auto"] #iconSun,
body[data-theme="auto"] #iconMoon { display: none; }

body[data-theme="dark"] #iconMoon,
body[data-theme="light"] #iconSun,
body[data-theme="auto"] #iconAuto { display: block; }

/* Animated rotation on toggle */
.theme-toggle.rotating svg,
.theme-toggle.rotating #iconAuto {
  animation: toggle-spin 0.4s ease;
}
@keyframes toggle-spin {
  0%   { transform: rotate(0deg) scale(1); }
  50%  { transform: rotate(180deg) scale(0.6); }
  100% { transform: rotate(360deg) scale(1); }
}

/* Auto mode indicator dot */
body[data-theme="auto"] .theme-toggle::after {
  content: "";
  position: absolute;
  bottom: 1px;
  right: 1px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  border: 1px solid var(--bg-alt);
}

/* ====================================================
   Hero
   ==================================================== */
.hero {
  text-align: center;
  padding: var(--space-2xl) 0 var(--space-xl);
  margin-bottom: var(--space-xl);
  border-bottom: 1px solid var(--border);
  background: var(--hero-bg);
  border-radius: 16px;
  margin-top: var(--space-md);
  padding: var(--space-2xl) var(--space-xl);
}

.hero h1 {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--accent), #b8a0ff 60%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.3;
}

.hero-desc { color: var(--text-muted); font-size: 1.05rem; }

/* ====================================================
   Post List (Homepage)
   ==================================================== */
.post-list { display: flex; flex-direction: column; gap: var(--space-lg); }

.post-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: var(--space-xl);
  transition: box-shadow 0.3s ease, transform 0.25s ease, border-color 0.3s ease;
}
.post-card:hover {
  box-shadow: var(--card-shadow);
  transform: translateY(-3px);
  border-color: var(--accent);
}

.post-card-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.35;
}
.post-card-title a { color: var(--text) !important; }
.post-card-title a:hover { color: var(--accent) !important; }

.post-card-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.post-card-excerpt {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
  line-height: 1.7;
}

.read-more {
  font-size: 0.875rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: gap 0.25s ease;
}
.read-more:hover { gap: 0.65rem; }

/* ====================================================
   Tags & Categories
   ==================================================== */
.tag {
  display: inline-block;
  background: var(--tag-bg);
  color: var(--tag-text) !important;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.65rem;
  border-radius: 20px;
  transition: background 0.2s, transform 0.15s;
}
.tag:hover { background: var(--accent-dim); transform: translateY(-1px); }

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: var(--space-md) 0;
}
.tag-cloud-item {
  background: var(--tag-bg);
  color: var(--tag-text) !important;
  padding: 0.45rem 0.95rem;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: background 0.2s, transform 0.2s;
}
.tag-cloud-item:hover { background: var(--accent-dim); transform: scale(1.04); }
.tag-count { opacity: 0.6; font-weight: 400; }

/* ====================================================
   Single Post / Article
   ==================================================== */
.post-full { padding: var(--space-2xl) 0; }

.post-header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 2px solid var(--border);
}

.post-title {
  font-size: 2.15rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.post-meta {
  font-size: 0.875rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.post-categories {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}
.post-categories .category {
  font-size: 0.75rem;
  color: var(--text-faint) !important;
  padding: 0.1rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: border-color 0.2s;
}
.post-categories .category:hover { border-color: var(--accent); }

/* ---- Article Typography ---- */
.post-content {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--text);
}

.post-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin: var(--space-2xl) 0 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
  letter-spacing: -0.01em;
  position: relative;
}
.post-content h2::before {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 3rem;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.post-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: var(--space-xl) 0 0.5rem;
  color: var(--text);
}

.post-content h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: var(--space-lg) 0 0.5rem;
  color: var(--text-muted);
}

.post-content p { margin-bottom: 1.15rem; }

.post-content strong { font-weight: 700; color: var(--text); }
.post-content em { font-style: italic; }

.post-content ul, .post-content ol {
  margin: 0.5rem 0 1.15rem 1.75rem;
}

.post-content li {
  margin-bottom: 0.35rem;
  padding-left: 0.25rem;
}
.post-content li::marker { color: var(--text-muted); }

.post-content blockquote {
  border-left: 4px solid var(--blockquote-border);
  background: var(--blockquote-bg);
  color: var(--blockquote-text);
  padding: 1.1rem 1.35rem;
  margin: var(--space-md) 0;
  border-radius: 0 10px 10px 0;
  font-style: italic;
  font-size: 1rem;
  line-height: 1.7;
}
.post-content blockquote p:last-child { margin-bottom: 0; }
.post-content blockquote strong { color: var(--blockquote-border); }

/* Inline code */
.post-content code {
  font-family: var(--font-mono);
  background: var(--inline-code-bg);
  color: var(--inline-code-text);
  padding: 0.15rem 0.45rem;
  border-radius: 5px;
  font-size: 0.88em;
  font-weight: 500;
}

/* Code blocks */
.post-content pre {
  background: var(--code-bg);
  padding: 1.25rem 1.5rem;
  border-radius: 12px;
  overflow-x: auto;
  margin: var(--space-md) 0;
  border: 1px solid var(--border);
  font-size: 0.875rem;
  line-height: 1.65;
}
.post-content pre code {
  background: none;
  color: var(--code-text);
  padding: 0;
  font-size: inherit;
  font-weight: 400;
}

/* KBD */
.post-content kbd {
  font-family: var(--font-sans);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  font-size: 0.82em;
  box-shadow: 0 1px 0 var(--border);
}

/* Tables */
.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-md) 0;
  font-size: 0.92rem;
  border-radius: 8px;
  overflow: hidden;
}
.post-content th, .post-content td {
  border: 1px solid var(--table-border);
  padding: 0.65rem 0.9rem;
  text-align: left;
}
.post-content th {
  background: var(--table-head);
  font-weight: 700;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}
.post-content tr:nth-child(even) { background: var(--table-stripe); }

.post-content img {
  margin: var(--space-lg) auto;
  display: block;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.18);
}
.post-content a img { box-shadow: none; }

.post-content video {
  max-width: 100%;
  border-radius: 8px;
  margin: var(--space-lg) auto;
  display: block;
}

.post-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-2xl) 0;
}

/* ---- Admonition (Callout) ---- */
.post-content .admonition {
  padding: 1rem 1.25rem;
  margin: var(--space-md) 0;
  border-radius: 10px;
  border-left: 4px solid var(--accent);
  background: var(--accent-dim);
  font-size: 0.95rem;
}

/* ---- Strikethrough ---- */
.post-content del,
.post-content s {
  text-decoration: line-through;
  color: var(--text-muted);
}

/* ---- Task Lists ---- */
.post-content .task-list {
  list-style: none;
  padding-left: 0;
}
.post-content .task-list-item {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}
.post-content .task-list-item input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  flex-shrink: 0;
  width: 1.15em;
  height: 1.15em;
  margin-top: 0.35em;
  border: 2px solid var(--border);
  border-radius: 5px;
  background: var(--bg-alt);
  cursor: default;
  transition: background 0.2s, border-color 0.2s;
}
.post-content .task-list-item input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41L9 16.17z'/%3E%3C/svg%3E");
  background-size: contain;
  background-origin: content-box;
  padding: 2px;
}

/* ---- Wiki Links ---- */
.broken-link { color: #f38ba8 !important; text-decoration: line-through; cursor: not-allowed; }
.missing-embed { color: #f38ba8; font-size: 0.85rem; }

/* Note embed iframe */
.note-embed {
  width: 100%;
  min-height: 200px;
  border: 1px solid var(--border);
  border-radius: 10px;
  margin: var(--space-md) 0;
  background: var(--card-bg);
}

/* ---- Backlinks ---- */
.backlinks {
  margin-top: var(--space-2xl);
  padding: 1.25rem 1.5rem;
  background: var(--bg-alt);
  border-radius: 12px;
  border: 1px solid var(--border);
}
.backlinks h2 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  border: none;
  padding: 0;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.backlinks ul { margin: 0; padding: 0; list-style: none; }
.backlinks li { margin-bottom: 0.35rem; padding: 0.25rem 0; }
.backlinks li::before {
  content: "→";
  color: var(--text-muted);
  margin-right: 0.5rem;
}

/* ---- Post Navigation ---- */
.post-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border);
}
.post-nav a {
  flex: 1;
  padding: var(--space-md) var(--space-lg);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.25s, background 0.25s, transform 0.2s;
  color: var(--text);
}
.post-nav a:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
  transform: translateY(-2px);
}
.post-nav-prev { text-align: left; }
.post-nav-next { text-align: right; }
.post-nav-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.post-nav-title { font-weight: 600; font-size: 0.95rem; color: var(--accent); }

/* ---- Pagination ---- */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-xl) 0;
}
.pagination a {
  padding: 0.5rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: border-color 0.2s, background 0.2s;
}
.pagination a:hover { border-color: var(--accent); background: var(--accent-dim); }
.pagination-info { color: var(--text-muted); font-size: 0.875rem; }

/* ---- Archive ---- */
.archive { padding: var(--space-md) 0; }
.archive-year { margin-bottom: var(--space-xl); }
.archive-year h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  color: var(--accent);
}
.archive-month { margin-bottom: var(--space-md); }
.archive-month h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  padding-left: 0.5rem;
  border-left: 3px solid var(--accent);
}
.archive-list { list-style: none; padding: 0; }
.archive-list li {
  display: flex;
  gap: var(--space-md);
  padding: 0.4rem 0;
  padding-left: 1rem;
}
.archive-list time {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-family: var(--font-mono);
  min-width: 6rem;
  opacity: 0.7;
}
.archive-list a { font-weight: 500; }

/* ---- Category ---- */
.category-list { display: flex; flex-wrap: wrap; gap: 0.75rem; padding: var(--space-md) 0; }
.category-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text) !important;
  padding: 0.5rem 1rem;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.category-item:hover { border-color: var(--accent); box-shadow: var(--card-shadow); }
.category-count { opacity: 0.6; font-weight: 400; }

/* ---- About Page ---- */
.about-profile {
  text-align: center;
  padding: var(--space-xl) 0 var(--space-lg);
}
.about-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 3px solid var(--accent);
  box-shadow: var(--accent-glow);
  margin-bottom: var(--space-md);
  transition: box-shadow 0.3s;
}
.about-name {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 0.25rem;
  letter-spacing: -0.02em;
}
.about-bio {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  font-style: italic;
}
.about-location {
  color: var(--text-faint);
  font-size: 0.9rem;
  margin-bottom: var(--space-md);
}
.about-links {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
}
.about-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text) !important;
  transition: border-color 0.2s, background 0.2s;
}
.about-link:hover { border-color: var(--accent); background: var(--accent-dim); }

.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
  padding: var(--space-md);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
}
.about-stat { text-align: center; padding: var(--space-sm); }
.about-stat-value {
  display: block;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.2;
}
.about-stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 0.15rem;
}

/* ---- 404 ---- */
.error-page {
  text-align: center;
  padding: 5rem 0;
}
.error-page h1 {
  font-size: 5rem;
  font-weight: 900;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--accent), #f38ba8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.error-page p {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: var(--space-lg);
}

/* ---- Footer ---- */
.site-footer {
  border-top: 2px solid var(--border);
  padding: var(--space-xl) 0;
  margin-top: var(--space-2xl);
  text-align: center;
}
.site-footer p { color: var(--text-muted); font-size: 0.825rem; }
.footer-powered {
  font-size: 0.72rem;
  opacity: 0.45;
  margin-top: 0.35rem;
}

/* ---- Excalidraw Viewer ---- */
.excalidraw-page { padding: var(--space-md) 0; }
.excalidraw-page h1 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: var(--space-lg);
}
.excalidraw-container {
  width: 100%;
  min-height: 420px;
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  margin: var(--space-lg) 0;
  background: var(--card-bg);
  position: relative;
}
.excalidraw-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 420px;
  color: var(--text-muted);
  font-size: 1rem;
}
.excalidraw-note {
  margin-top: var(--space-lg);
  padding: var(--space-md);
  background: var(--bg-alt);
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 0.95rem;
}
.excalidraw-note h2, .excalidraw-note h3,
.excalidraw-note h4, .excalidraw-note h5 {
  font-size: 1.1rem;
  margin: 0 0 0.5rem;
}
.excalidraw-tags {
  margin-top: var(--space-md);
  display: flex;
  gap: 0.5rem;
}

/* ====================================================
   Vue.js Dynamic Components
   ==================================================== */

/* Search controls */
.vue-controls { margin-bottom: var(--space-xl); }

.search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-input {
  width: 100%;
  padding: 0.8rem 1rem 0.8rem 2.8rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card-bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  transition: border-color 0.25s, box-shadow 0.25s;
  outline: none;
}
.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--focus-ring);
}
.search-input::placeholder { color: var(--text-faint); }

.search-icon {
  position: absolute;
  left: 0.85rem;
  font-size: 1rem;
  pointer-events: none;
  opacity: 0.5;
}

.search-clear {
  position: absolute;
  right: 0.65rem;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
  transition: color 0.15s, background 0.15s;
}
.search-clear:hover {
  color: var(--text);
  background: var(--bg-alt);
}

/* Tag filter buttons */
.tag-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: var(--space-sm);
  padding: 0.5rem 0;
}

.tag-filter {
  background: var(--tag-bg);
  color: var(--tag-text);
  border: 1px solid transparent;
  padding: 0.35rem 0.85rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, transform 0.15s;
  font-family: var(--font-sans);
}
.tag-filter:hover {
  background: var(--accent-dim);
  transform: translateY(-1px);
}
.tag-filter.active {
  border-color: var(--accent);
  background: var(--accent-dim);
  box-shadow: 0 0 0 1px var(--accent);
}

/* Result info */
.result-info {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 0.35rem 0 0;
  margin-top: var(--space-xs);
}

/* Empty state */
.no-results {
  text-align: center;
  padding: var(--space-2xl) 0;
  color: var(--text-muted);
}
.no-results p {
  font-size: 1.1rem;
  margin-bottom: var(--space-md);
}

.btn-link {
  background: none;
  border: 1px solid var(--border);
  color: var(--accent);
  padding: 0.5rem 1.25rem;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: border-color 0.15s, background 0.15s;
}
.btn-link:hover { border-color: var(--accent); background: var(--accent-dim); }

/* Loading skeleton */
.loading-skeleton {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}
.skeleton-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: var(--space-xl);
}
.skeleton-line {
  height: 0.9rem;
  background: var(--bg-alt);
  border-radius: 4px;
  margin-bottom: 0.75rem;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}
.skeleton-title { width: 60%; height: 1.3rem; }
.skeleton-meta { width: 40%; }
.skeleton-text { width: 85%; }

@keyframes skeleton-pulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.8; }
}

/* Vue transition */
.post-card-enter-active {
  animation: card-enter 0.35s ease-out;
}
@keyframes card-enter {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ====================================================
   Focus & Accessibility
   ==================================================== */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ====================================================
   Responsive
   ==================================================== */
@media (max-width: 640px) {
  .site-header .container { gap: 0.75rem; }
  .site-nav { gap: 0.75rem; }

  .hero { padding: var(--space-xl) var(--space-md); }
  .hero h1 { font-size: 1.6rem; }

  .post-title { font-size: 1.55rem; }

  .post-content { font-size: 1rem; }
  .post-content pre { padding: 1rem; font-size: 0.8rem; }
  .post-content table { font-size: 0.8rem; }

  .post-nav { flex-direction: column; }
  .post-nav-next { text-align: left; }

  .archive-list li { flex-direction: column; gap: 0.15rem; }
  .archive-list time { min-width: unset; }

  .error-page h1 { font-size: 3.5rem; }

  .search-input {
    padding: 0.65rem 0.85rem 0.65rem 2.5rem;
    font-size: 0.95rem;
  }

  .about-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-avatar {
    width: 96px;
    height: 96px;
  }
}