/* ==========================================================================
   栖迟手记 (QiChi Notes) — Editorial Static Blog Stylesheet
   Design Paradigm: Atmospheric Minimalism & Swiss Editorial Grid
   ========================================================================== */

:root {
  /* Light Mode (Default: Warm Alabaster Paper) */
  --bg-canvas: #FAF8F5;
  --bg-elevated: #F3EFEA;
  --bg-card: #FFFFFF;
  --bg-code: #F0ECE3;
  --bg-glass: rgba(250, 248, 245, 0.88);

  --text-primary: #18181B;
  --text-secondary: #4A4A52;
  --text-muted: #71717A;
  --text-faint: #9E9A90;

  --accent-primary: #C84B31;
  --accent-primary-hover: #A83820;
  --accent-primary-soft: rgba(200, 75, 49, 0.09);
  --accent-secondary: #2E5A44;
  --accent-secondary-soft: rgba(46, 90, 68, 0.1);

  --border-hairline: #E6E3DC;
  --border-strong: #CECAC0;

  --shadow-subtle: 0 2px 10px rgba(24, 24, 27, 0.03);
  --shadow-modal: 0 20px 50px rgba(24, 24, 27, 0.14);

  /* Typography */
  --font-serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", "PMingLiU", Georgia, serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Menlo", "Consolas", monospace;
  --font-article-body: var(--font-sans);

  /* Layout */
  --max-width: 1120px;
  --reading-width: 680px;
  --radius-sm: 4px;
  --radius-md: 6px;
}

[data-theme="dark"] {
  --bg-canvas: #121211;
  --bg-elevated: #1A1917;
  --bg-card: #1E1D1A;
  --bg-code: #23211E;
  --bg-glass: rgba(18, 18, 17, 0.88);

  --text-primary: #EAE6DF;
  --text-secondary: #B5B0A6;
  --text-muted: #858078;
  --text-faint: #5C5852;

  --accent-primary: #E06D53;
  --accent-primary-hover: #F08066;
  --accent-primary-soft: rgba(224, 109, 83, 0.14);
  --accent-secondary: #5B9A78;
  --accent-secondary-soft: rgba(91, 154, 120, 0.15);

  --border-hairline: #282623;
  --border-strong: #3A3732;

  --shadow-subtle: 0 2px 12px rgba(0, 0, 0, 0.25);
  --shadow-modal: 0 24px 60px rgba(0, 0, 0, 0.55);
}

[data-font-mode="serif"] {
  --font-article-body: var(--font-serif);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.25s ease, color 0.25s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

::selection {
  background-color: var(--accent-primary-soft);
  color: var(--accent-primary);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease;
}

img, svg {
  display: block;
  max-width: 100%;
}

/* Reading Progress Bar */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: var(--accent-primary);
  width: 0%;
  z-index: 200;
  transition: width 0.1s linear;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   Editorial Masthead & Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-hairline);
}

.masthead-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 7px 0;
  border-bottom: 1px solid var(--border-hairline);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

.masthead-meta {
  display: flex;
  align-items: center;
  gap: 16px;
}

.status-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-secondary);
  margin-right: 6px;
  vertical-align: middle;
}

.masthead-main {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.brand-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-primary);
}

.brand-subtitle {
  font-size: 0.82rem;
  color: var(--text-muted);
  border-left: 1px solid var(--border-strong);
  padding-left: 12px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.nav-links a {
  font-size: 0.92rem;
  color: var(--text-secondary);
  padding: 4px 0;
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--accent-primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-left: 14px;
  border-left: 1px solid var(--border-hairline);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-hairline);
  color: var(--text-secondary);
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: all 0.18s ease;
}

.icon-btn:hover {
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.icon-btn kbd {
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--bg-canvas);
  padding: 1px 4px;
  border-radius: 3px;
  border: 1px solid var(--border-hairline);
}

/* ==========================================================================
   Swiss Editorial Grid Layout (Home Page)
   ========================================================================== */
.editorial-hero {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  border-bottom: 1px solid var(--border-hairline);
}

.hero-featured {
  grid-column: span 8;
  padding: 40px 40px 40px 0;
  border-right: 1px solid var(--border-hairline);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hero-sidebar {
  grid-column: span 4;
  padding: 40px 0 40px 36px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-primary);
  margin-bottom: 14px;
}

.section-kicker::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--accent-primary);
}

.featured-illustration {
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 24px;
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
}

.featured-illustration svg {
  width: 100%;
  height: auto;
}

.illustration-caption {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--border-hairline);
}

.featured-title {
  font-family: var(--font-serif);
  font-size: clamp(1.65rem, 2.6vw, 2.25rem);
  line-height: 1.32;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.featured-title a:hover {
  color: var(--accent-primary);
}

.featured-excerpt {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 22px;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.tag-badge {
  display: inline-block;
  padding: 2px 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-hairline);
  border-radius: 3px;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.tag-badge.accent {
  background: var(--accent-primary-soft);
  border-color: transparent;
  color: var(--accent-primary);
}

.read-more-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--accent-primary);
  margin-left: auto;
}

.read-more-link:hover {
  color: var(--accent-primary-hover);
  transform: translateX(2px);
}

/* Sidebar Widgets */
.sidebar-box {
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-hairline);
}

.sidebar-box:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.sidebar-heading {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.author-bio-text {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

.now-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.88rem;
}

.now-list li {
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 8px;
  align-items: baseline;
}

.now-label {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted);
}

.now-value {
  color: var(--text-secondary);
}

.micro-note-card {
  background: var(--bg-elevated);
  border-left: 2px solid var(--accent-secondary);
  padding: 12px 14px;
  font-family: var(--font-serif);
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.micro-note-date {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ==========================================================================
   Main Content Stream & Category Filter
   ========================================================================== */
.stream-section {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  padding: 44px 0 64px;
}

.stream-main {
  grid-column: span 8;
  padding-right: 40px;
  border-right: 1px solid var(--border-hairline);
}

.stream-aside {
  grid-column: span 4;
  padding-left: 36px;
}

.filter-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-bottom: 18px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--border-strong);
}

.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-btn {
  background: transparent;
  border: 1px solid transparent;
  padding: 5px 11px;
  border-radius: var(--radius-sm);
  font-size: 0.84rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.16s ease;
}

.filter-btn:hover {
  color: var(--text-primary);
  background: var(--bg-elevated);
}

.filter-btn.active {
  background: var(--text-primary);
  color: var(--bg-canvas);
  font-weight: 500;
}

.stream-count {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
}

/* Article Stream Items */
.post-list {
  display: flex;
  flex-direction: column;
}

.post-card {
  padding: 28px 0;
  border-bottom: 1px solid var(--border-hairline);
  transition: transform 0.18s ease;
}

.post-card:last-child {
  border-bottom: none;
}

.post-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.post-card-title {
  font-family: var(--font-serif);
  font-size: 1.32rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.post-card-title a:hover {
  color: var(--accent-primary);
}

.post-card-summary {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 14px;
}

.post-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
}

.post-tags {
  display: flex;
  gap: 8px;
}

.post-tags span {
  color: var(--text-muted);
}

/* Aside Field Notes & Colophon */
.field-notes-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.field-note-item {
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--border-hairline);
}

.field-note-item:last-child {
  border-bottom: none;
}

.field-note-meta {
  font-family: var(--font-mono);
  font-size: 0.73rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.field-note-body {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.archive-mini-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.archive-mini-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.88rem;
  padding-bottom: 8px;
  border-bottom: 1px dotted var(--border-hairline);
}

.archive-mini-list a:hover {
  color: var(--accent-primary);
}

.archive-mini-count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Single Article Page (Long-Form Reading Layout)
   ========================================================================== */
.article-wrapper {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  padding: 48px 0 80px;
  gap: 24px;
}

.article-sidebar-left {
  grid-column: span 2;
  padding-top: 8px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 6px 10px;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
}

.back-link:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.article-main {
  grid-column: span 7;
  max-width: var(--reading-width);
  width: 100%;
}

.article-sidebar-right {
  grid-column: span 3;
  padding-left: 20px;
}

.toc-sticky {
  position: sticky;
  top: 96px;
  border-left: 1px solid var(--border-hairline);
  padding-left: 18px;
}

.toc-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.83rem;
}

.toc-list a {
  color: var(--text-muted);
  display: block;
  line-height: 1.45;
}

.toc-list a:hover {
  color: var(--accent-primary);
}

.reading-controls {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--border-hairline);
}

.reading-controls-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  display: block;
}

.font-switch-group {
  display: inline-flex;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.font-switch-btn {
  background: var(--bg-elevated);
  border: none;
  padding: 4px 10px;
  font-size: 0.76rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.font-switch-btn.active {
  background: var(--text-primary);
  color: var(--bg-canvas);
}

/* Article Header & Prose */
.article-header {
  padding-bottom: 28px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border-hairline);
}

.article-kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.article-title {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3vw, 2.35rem);
  line-height: 1.32;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.article-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
  padding-top: 14px;
  border-top: 1px dashed var(--border-hairline);
}

.prose {
  font-family: var(--font-article-body);
  font-size: 1.0625rem;
  line-height: 1.88;
  color: var(--text-primary);
}

.prose p {
  margin-bottom: 1.5em;
  text-align: justify;
}

.prose h2 {
  font-family: var(--font-serif);
  font-size: 1.42rem;
  font-weight: 700;
  margin: 2.2em 0 0.85em;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-hairline);
  color: var(--text-primary);
}

.prose h3 {
  font-family: var(--font-serif);
  font-size: 1.16rem;
  font-weight: 700;
  margin: 1.8em 0 0.65em;
  color: var(--text-primary);
}

.prose blockquote {
  margin: 1.8em 0;
  padding: 14px 20px;
  border-left: 3px solid var(--accent-primary);
  background: var(--bg-elevated);
  font-family: var(--font-serif);
  font-size: 0.98rem;
  color: var(--text-secondary);
}

.prose blockquote cite {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  font-style: normal;
}

.prose ul, .prose ol {
  margin: 0 0 1.5em 1.4em;
}

.prose li {
  margin-bottom: 0.5em;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--bg-code);
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--accent-primary);
}

.prose pre {
  background: var(--bg-code);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  overflow-x: auto;
  margin: 1.6em 0;
  line-height: 1.6;
}

.prose pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
  font-size: 0.84rem;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.8em 0;
  font-size: 0.9rem;
}

.prose th, .prose td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-hairline);
  text-align: left;
}

.prose th {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  background: var(--bg-elevated);
  text-transform: uppercase;
}

/* EXIF / Figure Cards inside Articles */
.figure-card {
  margin: 2em 0;
  background: var(--bg-elevated);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 20px;
}

.figure-caption {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--border-hairline);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Article Footer & Prev/Next Nav */
.article-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-strong);
}

.license-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border-hairline);
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.post-nav-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.post-nav-card {
  padding: 16px;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  transition: border-color 0.18s ease;
}

.post-nav-card:hover {
  border-color: var(--accent-primary);
}

.post-nav-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.post-nav-title {
  font-family: var(--font-serif);
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* ==========================================================================
   Archive, Notes, and About Pages
   ========================================================================== */
.page-header {
  padding: 44px 0 28px;
  border-bottom: 1px solid var(--border-hairline);
  margin-bottom: 36px;
}

.page-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.page-desc {
  color: var(--text-secondary);
  font-size: 0.98rem;
}

.archive-year-block {
  margin-bottom: 40px;
}

.archive-year-title {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  padding-bottom: 10px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-strong);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.archive-year-count {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 400;
}

.archive-row {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: 16px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px dashed var(--border-hairline);
}

.archive-date {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.archive-link {
  font-family: var(--font-serif);
  font-size: 1.06rem;
  font-weight: 600;
  color: var(--text-primary);
}

.archive-link:hover {
  color: var(--accent-primary);
}

/* Notes Grid (Commonplace Book) */
.notes-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  padding-bottom: 64px;
}

.note-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.note-card-header {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--border-hairline);
}

.note-card-content {
  font-size: 0.96rem;
  color: var(--text-primary);
  line-height: 1.8;
  margin-bottom: 14px;
}

.note-card-footer {
  font-family: var(--font-mono);
  font-size: 0.73rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Search Modal (⌘K)
   ========================================================================== */
.search-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(18, 18, 17, 0.55);
  backdrop-filter: blur(4px);
  z-index: 300;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding-top: 10vh;
}

.search-backdrop.open {
  display: flex;
}

.search-modal {
  width: 92%;
  max-width: 600px;
  background: var(--bg-canvas);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-modal);
  overflow: hidden;
}

.search-input-wrap {
  display: flex;
  align-items: center;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-hairline);
  gap: 12px;
}

.search-input {
  width: 100%;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-size: 0.98rem;
  outline: none;
}

.search-results {
  max-height: 360px;
  overflow-y: auto;
  padding: 8px;
}

.search-result-item {
  display: block;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
}

.search-result-item:hover {
  background: var(--bg-elevated);
}

.search-result-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.96rem;
  color: var(--text-primary);
}

.search-result-meta {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ==========================================================================
   Site Footer
   ========================================================================== */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-hairline);
  padding: 36px 0;
  font-size: 0.84rem;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-links {
  display: flex;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.footer-links a:hover {
  color: var(--text-primary);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 960px) {
  .hero-featured,
  .hero-sidebar,
  .stream-main,
  .stream-aside {
    grid-column: span 12;
    padding-left: 0;
    padding-right: 0;
    border-right: none;
  }

  .hero-featured {
    border-bottom: 1px solid var(--border-hairline);
  }

  .stream-main {
    border-bottom: 1px solid var(--border-hairline);
    padding-bottom: 32px;
    margin-bottom: 32px;
  }

  .article-sidebar-left,
  .article-main,
  .article-sidebar-right {
    grid-column: span 12;
    padding-left: 0;
  }

  .article-sidebar-right {
    display: none;
  }

  .notes-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .masthead-top {
    display: none;
  }

  .masthead-main {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .brand-subtitle {
    display: none;
  }

  .site-nav {
    width: 100%;
    justify-content: space-between;
  }

  .nav-links {
    gap: 14px;
  }

  .archive-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .post-nav-grid {
    grid-template-columns: 1fr;
  }
}