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

:root {
  /* Light (top) */
  --light-bg: #faf8f5;
  --light-bg-alt: #f0ede8;
  --light-bg-card: #ffffff;
  --light-border: #e0dcd5;
  --light-text: #1a1a1a;
  --light-text-muted: #6b6560;
  --light-accent: #c07830;
  --light-accent-hover: #a86520;

  /* Dark (night) */
  --dark-bg: #0a0a0b;
  --dark-bg-alt: #111113;
  --dark-bg-card: #161618;
  --dark-border: #222225;
  --dark-text: #e8e8ec;
  --dark-text-muted: #8b8b94;
  --dark-accent: #e8a04c;
  --dark-accent-hover: #f0b060;

  /* Morning (6-10) */
  --morning-bg: #fdf6ee;
  --morning-bg-alt: #f7ede0;
  --morning-bg-card: #fffcf7;
  --morning-border: #e8ddd0;
  --morning-text: #2a2018;
  --morning-text-muted: #7a6b58;
  --morning-accent: #d4893a;
  --morning-accent-hover: #c07830;

  /* Sunset (16-19) */
  --sunset-bg: #1a1018;
  --sunset-bg-alt: #221420;
  --sunset-bg-card: #2a1828;
  --sunset-border: #3a2838;
  --sunset-text: #f0d8e8;
  --sunset-text-muted: #a88898;
  --sunset-accent: #e86870;
  --sunset-accent-hover: #f08088;

  /* Active (interpolated by JS, starts light) */
  --bg: var(--light-bg);
  --bg-alt: var(--light-bg-alt);
  --bg-card: var(--light-bg-card);
  --border: var(--light-border);
  --text: var(--light-text);
  --text-muted: var(--light-text-muted);
  --accent: var(--light-accent);
  --accent-hover: var(--light-accent-hover);

  --radius: 12px;
  --font: 'Inter', 'Noto Sans JP', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s, color 0.3s;
}

/* Force dark mode */
body.force-dark {
  --bg: var(--dark-bg);
  --bg-alt: var(--dark-bg-alt);
  --bg-card: var(--dark-bg-card);
  --border: var(--dark-border);
  --text: var(--dark-text);
  --text-muted: var(--dark-text-muted);
  --accent: var(--dark-accent);
  --accent-hover: var(--dark-accent-hover);
}
body.force-light {
  --bg: var(--light-bg);
  --bg-alt: var(--light-bg-alt);
  --bg-card: var(--light-bg-card);
  --border: var(--light-border);
  --text: var(--light-text);
  --text-muted: var(--light-text-muted);
  --accent: var(--light-accent);
  --accent-hover: var(--light-accent-hover);
}

a { color: var(--accent); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--accent-hover); }

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

.container { max-width: 960px; margin: 0 auto; padding: 0 24px; }

/* ── Nav ── */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s, border-color 0.3s;
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 56px;
}
.nav-logo {
  font-weight: 700; font-size: 1.1rem; color: var(--text);
  letter-spacing: 0.04em;
}
.nav-logo:hover { color: var(--accent); }
.nav-links { display: flex; gap: 20px; align-items: center; }
.nav-links a {
  color: var(--text-muted); font-size: 0.875rem; font-weight: 500;
  transition: color 0.15s;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }

/* Mode Toggle */
.mode-toggle {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--border); border: none; color: var(--text);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; font-size: 1.1rem;
  transition: background 0.2s, color 0.2s;
}
.mode-toggle:hover { background: var(--accent); color: var(--bg); }

/* ── Hero (Light / Personal) ── */
.hero {
  padding: 100px 0 60px;
  text-align: center;
}
.hero-inner { max-width: 700px; margin: 0 auto; }
.hero-avatar {
  width: 140px; height: 140px; border-radius: 50%;
  object-fit: cover; margin: 0 auto 24px;
  border: 4px solid var(--border);
  box-shadow: 0 8px 32px rgba(0,0,0,0.08);
}
.hero h1 {
  font-size: 2.2rem; font-weight: 700; letter-spacing: 0.04em;
  margin-bottom: 4px;
}
.hero-en {
  font-size: 0.95rem; color: var(--text-muted); font-weight: 400;
  margin-bottom: 16px;
}
.hero-title {
  font-size: 1rem; color: var(--accent); font-weight: 600;
  margin-bottom: 20px; letter-spacing: 0.02em;
}
.hero-bio {
  font-size: 0.95rem; color: var(--text-muted); line-height: 1.8;
  margin-bottom: 28px;
}
.hero-links { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ── Photo Gallery ── */
.photos {
  padding: 0 0 80px;
}
.photos-inner {
  max-width: 960px; margin: 0 auto; padding: 0 24px;
}
.photos-scroll {
  display: flex; gap: 16px; overflow-x: auto;
  padding-bottom: 16px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.photos-scroll::-webkit-scrollbar { display: none; }
.photo-item {
  flex: 0 0 auto; scroll-snap-align: start;
  border-radius: 16px; overflow: hidden;
  position: relative;
}
.photo-item img {
  height: 280px; width: auto; min-width: 200px;
  object-fit: cover;
  transition: transform 0.3s;
}
.photo-item:hover img { transform: scale(1.03); }
.photo-caption {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 12px 16px;
  background: linear-gradient(transparent, rgba(0,0,0,0.6));
  color: #fff; font-size: 0.8rem; font-weight: 500;
}

/* ── Transition Indicator ── */
.scroll-gradient-hint {
  text-align: center; padding: 40px 0;
  color: var(--text-muted); font-size: 0.85rem;
  opacity: 0.6;
}
.scroll-gradient-hint .arrow {
  display: block; margin: 8px auto 0;
  animation: float-down 1.5s ease-in-out infinite;
  font-size: 1.2rem;
}
@keyframes float-down {
  0%, 100% { transform: translateY(0); opacity: 0.4; }
  50% { transform: translateY(6px); opacity: 1; }
}

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 20px; border-radius: 8px;
  font-size: 0.875rem; font-weight: 500;
  transition: all 0.15s; cursor: pointer; border: none;
}
.btn-outline {
  color: var(--text-muted); border: 1px solid var(--border); background: transparent;
}
.btn-outline:hover { color: var(--text); border-color: var(--text-muted); }
.btn-primary {
  background: var(--accent); color: var(--light-bg); font-weight: 600;
}
.btn-primary:hover { background: var(--accent-hover); }

/* ── Sections ── */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); transition: background 0.3s; }
.section-title {
  font-size: 1.5rem; font-weight: 700; margin-bottom: 4px;
}
.section-sub {
  color: var(--text-muted); font-size: 0.9rem; margin-bottom: 40px;
}
.section-head-row {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 0;
}
.section-head-row .section-title { margin-bottom: 0; }
.link-arrow {
  font-size: 0.875rem; color: var(--accent); font-weight: 500;
}

/* ── Engineer Mode Labels (appear as you scroll deeper) ── */
.engineer-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  opacity: 0;
  transition: opacity 0.5s;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.engineer-label.visible { opacity: 1; }

/* ── Projects ── */
.projects-grid {
  display: flex; flex-direction: column; gap: 1px;
  background: var(--border); border-radius: var(--radius);
  overflow: hidden;
  transition: background 0.3s;
}
.project-card {
  display: flex; align-items: center; gap: 16px;
  padding: 20px 24px;
  background: var(--bg-card);
  color: var(--text);
  transition: background 0.15s;
}
.project-card:hover { background: color-mix(in srgb, var(--bg-card) 90%, var(--accent) 10%); color: var(--text); }
.project-logo {
  width: 40px; height: 40px; border-radius: 10px; object-fit: cover;
  flex-shrink: 0;
}
.project-logo-placeholder {
  width: 40px; height: 40px; border-radius: 10px;
  background: var(--border); color: var(--text-muted);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1.1rem; flex-shrink: 0;
}
.project-body { flex: 1; min-width: 0; }
.project-body h3 {
  font-size: 1rem; font-weight: 600; margin-bottom: 2px;
}
.project-body p {
  font-size: 0.85rem; color: var(--text-muted); line-height: 1.5;
}
.project-metrics {
  font-size: 0.78rem; color: var(--accent); font-weight: 500;
  font-family: var(--font-mono);
}
.project-arrow {
  width: 18px; height: 18px; flex-shrink: 0;
  color: var(--text-muted); transition: color 0.15s;
}
.project-card:hover .project-arrow { color: var(--accent); }

/* ── Timeline ── */
.timeline {
  position: relative;
  padding-left: 28px;
}
.timeline::before {
  content: '';
  position: absolute; left: 7px; top: 8px; bottom: 8px;
  width: 1px; background: var(--border);
}
.timeline-item {
  position: relative;
  padding-bottom: 32px;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-marker {
  position: absolute; left: -28px; top: 8px;
  width: 15px; height: 15px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--border);
  transition: background 0.3s, border-color 0.3s;
}
.timeline-highlight .timeline-marker {
  border-color: var(--accent); background: var(--accent);
}
.timeline-content {}
.timeline-head {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 6px; flex-wrap: wrap;
}
.timeline-logo {
  width: 32px; height: 32px; border-radius: 8px; object-fit: cover;
}
.timeline-head h3 { font-size: 1rem; font-weight: 600; }
.timeline-head h3 a { color: var(--text); }
.timeline-head h3 a:hover { color: var(--accent); }
.timeline-role { font-size: 0.85rem; color: var(--text-muted); }
.timeline-period {
  font-size: 0.8rem; color: var(--text-muted);
  margin-left: auto; font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
}
.timeline-content > p {
  font-size: 0.875rem; color: var(--text-muted); line-height: 1.6;
}

/* ── Music ── */
.tracks-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 8px;
}
.track-card {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px; border-radius: var(--radius);
  background: var(--bg-card); border: 1px solid var(--border);
  transition: border-color 0.15s, background 0.3s;
}
.track-card:hover { border-color: var(--text-muted); }
.track-card.playing { border-color: var(--accent); }
.track-art {
  width: 56px; height: 56px; border-radius: 8px; object-fit: cover;
  flex-shrink: 0;
}
.track-info { flex: 1; min-width: 0; }
.track-title {
  display: block; font-size: 0.9rem; font-weight: 500;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.track-artist {
  display: block; font-size: 0.8rem; color: var(--text-muted);
}
.track-play {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--border); border: none; color: var(--text);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; flex-shrink: 0;
  transition: background 0.15s;
}
.track-play svg { width: 14px; height: 14px; }
.track-play:hover { background: var(--accent); color: var(--dark-bg); }
.track-card.playing .track-play { background: var(--accent); color: var(--dark-bg); }

/* ── Soluna Channels ── */
.channels-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.channel-card {
  padding: 20px 24px; border-radius: var(--radius);
  background: var(--bg-card); border: 1px solid var(--border);
  transition: border-color 0.2s, background 0.3s;
}
.channel-card:hover { border-color: var(--text-muted); }
.channel-card.listening { border-color: #00d4aa; }
.channel-header {
  display: flex; align-items: center; gap: 14px;
  margin-bottom: 16px;
}
.channel-wave {
  display: flex; align-items: flex-end; gap: 3px;
  height: 28px; flex-shrink: 0;
}
.wave-bar {
  display: block; width: 4px; border-radius: 2px;
  background: #00d4aa;
  animation: wave-pulse 1.2s ease-in-out infinite;
}
.wave-bar:nth-child(1) { height: 8px; animation-delay: 0s; }
.wave-bar:nth-child(2) { height: 16px; animation-delay: 0.15s; }
.wave-bar:nth-child(3) { height: 24px; animation-delay: 0.3s; }
.wave-bar:nth-child(4) { height: 12px; animation-delay: 0.45s; }
.wave-bar:nth-child(5) { height: 20px; animation-delay: 0.6s; }
@keyframes wave-pulse {
  0%, 100% { transform: scaleY(0.4); opacity: 0.5; }
  50% { transform: scaleY(1); opacity: 1; }
}
.channel-info { flex: 1; min-width: 0; }
.channel-info h3 {
  font-size: 1.05rem; font-weight: 600;
  font-family: var(--font-mono); letter-spacing: 0.02em;
}
.channel-status {
  font-size: 0.78rem; color: var(--text-muted);
}
.btn-channel {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 8px 24px; border-radius: 8px;
  background: #00d4aa; color: #0a0a0b;
  font-size: 0.875rem; font-weight: 600;
  border: none; cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}
.btn-channel:hover { background: #00eabb; transform: translateY(-1px); }
.btn-channel.active { background: var(--border); color: var(--text); }
.btn-channel.active:hover { background: var(--text-muted); color: var(--bg); }
.channel-embed {
  margin-top: 16px;
}
.channel-embed iframe {
  width: 100%; height: 120px; border: none; border-radius: 8px;
  background: var(--bg-alt);
}

/* ── Blog (Engineer zone) ── */
.section-engineer {
  font-family: var(--font-mono);
}
.section-engineer .section-title {
  font-family: var(--font-mono);
}
.section-engineer .section-sub {
  font-family: var(--font-mono);
  font-size: 0.85rem;
}
.section-engineer .section-sub::before {
  content: '// ';
  color: var(--accent);
}

.blog-grid {
  display: grid; grid-template-columns: 1fr; gap: 1px;
  background: var(--border); border-radius: var(--radius);
  overflow: hidden; margin-top: 24px;
}
.blog-card {
  display: block; padding: 20px 24px;
  background: var(--bg-card); color: var(--text);
  transition: background 0.15s;
}
.blog-card:hover { background: color-mix(in srgb, var(--bg-card) 90%, var(--accent) 10%); color: var(--text); }
.blog-card time {
  font-size: 0.8rem; color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
}
.blog-card h3 {
  font-size: 1rem; font-weight: 600; margin: 4px 0;
}
.blog-card p {
  font-size: 0.85rem; color: var(--text-muted); line-height: 1.5;
}

.blog-list { display: flex; flex-direction: column; gap: 1px; background: var(--border); border-radius: var(--radius); overflow: hidden; }
.blog-list-item {
  display: block; padding: 24px;
  background: var(--bg-card); color: var(--text);
  transition: background 0.15s;
}
.blog-list-item:hover { background: color-mix(in srgb, var(--bg-card) 90%, var(--accent) 10%); color: var(--text); }
.blog-list-item time { font-size: 0.8rem; color: var(--text-muted); font-family: var(--font-mono); }
.blog-list-item h2 { font-size: 1.1rem; font-weight: 600; margin: 6px 0; }
.blog-list-item p { font-size: 0.875rem; color: var(--text-muted); }
.blog-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.tag {
  font-size: 0.75rem; padding: 2px 10px; border-radius: 99px;
  background: var(--border); color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ── Article ── */
.article-container { max-width: 720px; }
.back-link {
  display: inline-block; font-size: 0.875rem; color: var(--text-muted);
  margin-bottom: 32px;
}
.back-link:hover { color: var(--text); }
.article-header { margin-bottom: 40px; }
.article-header time { font-size: 0.85rem; color: var(--text-muted); font-family: var(--font-mono); }
.article-header h1 {
  font-size: 1.8rem; font-weight: 700; margin: 8px 0 12px;
  line-height: 1.4;
}
.article-body {
  font-size: 1rem; line-height: 1.9; color: var(--text-muted);
}
.article-body h1, .article-body h2 {
  font-size: 1.3rem; font-weight: 700; margin: 2.5rem 0 0.8rem;
  color: var(--text);
}
.article-body h3 {
  font-size: 1.1rem; font-weight: 600; margin: 2rem 0 0.6rem;
  color: var(--text);
}
.article-body p { margin-bottom: 1.2rem; }
.article-body ul, .article-body ol {
  margin: 0 0 1.2rem 1.5rem;
}
.article-body li { margin-bottom: 0.4rem; }
.article-body code {
  background: var(--bg-alt); padding: 2px 6px; border-radius: 4px;
  font-size: 0.9em; font-family: var(--font-mono);
}
.article-body pre {
  background: var(--bg-alt); padding: 16px 20px; border-radius: 8px;
  overflow-x: auto; margin-bottom: 1.2rem;
  border: 1px solid var(--border);
  font-family: var(--font-mono);
}
.article-body pre code { background: none; padding: 0; }
/* Article meta row */
.article-meta {
  display: flex; align-items: center; gap: 12px;
  font-size: 0.85rem; color: var(--text-muted);
  font-family: var(--font-mono);
}
.reading-time {
  opacity: 0.7;
}
.reading-time::before { content: '·  '; }

/* Reading progress bar */
.progress-bar {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: var(--accent);
  z-index: 1000; transition: width 0.1s;
}

/* Share section */
.share-section {
  display: flex; align-items: center; gap: 10px;
  margin-top: 48px; padding-top: 24px;
  border-top: 1px solid var(--border);
}
.share-label {
  font-size: 0.85rem; color: var(--text-muted); margin-right: 4px;
}
.share-btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 6px 16px; border-radius: 8px;
  font-size: 0.8rem; font-weight: 500;
  background: var(--bg-alt); color: var(--text-muted);
  border: 1px solid var(--border);
  cursor: pointer; transition: all 0.15s;
  text-decoration: none;
}
.share-btn:hover {
  background: var(--accent); color: var(--bg);
  border-color: var(--accent);
}

.article-body blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 16px; margin: 1.2rem 0;
  color: var(--text-muted); font-style: italic;
}
.article-body a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.article-body img { border-radius: 8px; margin: 1.5rem 0; }
.article-body table {
  width: 100%; border-collapse: collapse; margin: 1.2rem 0;
  font-size: 0.9rem;
}
.article-body th, .article-body td {
  padding: 8px 12px; border: 1px solid var(--border); text-align: left;
}
.article-body th { background: var(--bg-alt); font-weight: 600; }

/* ── Terminal-style footer ── */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  font-family: var(--font-mono);
}
.footer-inner {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 16px;
}
.footer-muted { font-size: 0.8rem; color: var(--text-muted); }
.footer-prompt {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
}
.footer-prompt .cursor {
  display: inline-block; width: 8px; height: 1em;
  background: var(--accent); margin-left: 2px;
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}
.footer-links { display: flex; gap: 20px; }
.footer-links a {
  font-size: 0.85rem; color: var(--text-muted);
}
.footer-links a:hover { color: var(--text); }

/* ── Reading Progress Bar ── */
.progress-bar {
  position: fixed; top: 0; left: 0; height: 3px; width: 0;
  background: var(--accent); z-index: 200;
  transition: width 0.1s linear;
}

/* ── Article Meta ── */
.article-meta {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 12px; flex-wrap: wrap;
}
.reading-time-badge, .word-count-badge {
  font-size: 0.75rem; font-family: var(--font-mono);
  color: var(--text-muted); background: var(--bg-alt);
  padding: 2px 8px; border-radius: 4px;
}
.article-lead {
  font-size: 1.05rem; color: var(--text-muted); line-height: 1.7;
  margin: 12px 0 16px; border-left: 3px solid var(--accent);
  padding-left: 16px;
}

/* ── Table of Contents ── */
.toc {
  margin: 24px 0 32px;
  background: var(--bg-alt); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 0;
}
.toc details { padding: 0; }
.toc summary {
  padding: 12px 20px; cursor: pointer;
  font-weight: 600; font-size: 0.9rem;
  color: var(--text-muted);
  list-style: none;
}
.toc summary::before { content: ''; }
.toc summary::-webkit-details-marker { display: none; }
.toc-title::after { content: ' +'; }
details[open] .toc-title::after { content: ' -'; }
#toc-list {
  padding: 0 20px 16px 36px; margin: 0;
  font-size: 0.85rem; line-height: 2;
}
#toc-list a { color: var(--text-muted); }
#toc-list a:hover { color: var(--accent); }
.toc-sub { padding-left: 16px; font-size: 0.8rem; }

/* ── Share Section ── */
.share-section {
  display: flex; align-items: center; gap: 10px;
  margin: 48px 0 32px; padding: 20px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.share-label {
  font-size: 0.85rem; color: var(--text-muted); font-weight: 600;
  margin-right: 8px;
}
.share-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: 6px;
  font-size: 0.8rem; font-weight: 500;
  background: var(--bg-alt); border: 1px solid var(--border);
  color: var(--text-muted); cursor: pointer;
  transition: all 0.15s; text-decoration: none;
  font-family: inherit;
}
.share-btn:hover { color: var(--text); border-color: var(--text-muted); background: var(--bg-card); }

/* ── Author Card ── */
.author-card {
  display: flex; align-items: flex-start; gap: 16px;
  padding: 24px; margin: 32px 0;
  background: var(--bg-alt); border-radius: var(--radius);
  border: 1px solid var(--border);
}
.author-avatar {
  width: 56px; height: 56px; border-radius: 50%; object-fit: cover;
  flex-shrink: 0;
}
.author-bio {
  font-size: 0.85rem; color: var(--text-muted); margin: 4px 0 8px;
}
.author-links { display: flex; gap: 16px; }
.author-links a { font-size: 0.8rem; color: var(--accent); }

/* ── Related Posts ── */
.related-posts {
  margin: 48px 0 32px;
}
.related-posts h2 {
  font-size: 1.1rem; font-weight: 600; margin-bottom: 16px;
}
.related-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 12px;
}
.related-card {
  display: block; padding: 16px 20px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text);
  transition: border-color 0.15s;
}
.related-card:hover { border-color: var(--accent); color: var(--text); }
.related-card time { font-size: 0.75rem; color: var(--text-muted); font-family: var(--font-mono); }
.related-card h3 { font-size: 0.9rem; font-weight: 600; margin: 4px 0 6px; }

/* ── Post Navigation (Prev/Next) ── */
.post-nav {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
  margin: 32px 0;
}
.post-nav-item {
  display: block; padding: 16px 20px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text);
  transition: border-color 0.15s;
}
.post-nav-item:hover { border-color: var(--accent); color: var(--text); }
.post-nav-label {
  display: block; font-size: 0.75rem; color: var(--text-muted);
  margin-bottom: 4px; font-family: var(--font-mono);
}
.post-nav-title {
  display: block; font-size: 0.9rem; font-weight: 600;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.post-nav-next { text-align: right; }

/* ── Blog List Enhancements ── */
.blog-list-meta {
  display: flex; align-items: center; gap: 10px;
}
.tag-filter {
  display: flex; gap: 8px; flex-wrap: wrap;
  margin-bottom: 24px;
}
.tag-link {
  cursor: pointer; transition: all 0.15s;
  color: var(--text-muted) !important;
}
.tag-link:hover { background: var(--accent); color: var(--dark-bg) !important; }
.tag-count {
  font-size: 0.65rem; opacity: 0.6;
}

/* ── Blog Search ── */
.blog-search {
  margin-bottom: 24px;
}
.search-input {
  width: 100%; padding: 10px 16px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text);
  font-family: var(--font); font-size: 0.9rem;
  outline: none; transition: border-color 0.15s;
}
.search-input::placeholder { color: var(--text-muted); }
.search-input:focus { border-color: var(--accent); }

/* ── Responsive ── */
@media (max-width: 640px) {
  .hero { padding: 60px 0 40px; }
  .hero h1 { font-size: 1.6rem; }
  .hero-avatar { width: 100px; height: 100px; }
  .section { padding: 60px 0; }
  .nav-links { gap: 12px; }
  .nav-links a { font-size: 0.8rem; }
  .timeline-period { margin-left: 0; width: 100%; margin-top: 4px; }
  .tracks-grid { grid-template-columns: 1fr; }
  .channels-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; text-align: center; }
  .project-card { flex-wrap: wrap; }
  .photo-item img { height: 200px; }
  .post-nav { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .author-card { flex-direction: column; align-items: center; text-align: center; }
  .share-section { flex-wrap: wrap; }
}