/* ── Tokens: Light — pure neutral, zero warmth ── */
:root {
  --bg:       #ffffff;
  --surface:  #f4f4f4;
  --text:     #111111;
  --muted:    #888888;
  --border:   #e3e3e3;
  --hero-size: clamp(40px, 5vw, 58px);
}

/* ── Tokens: Dark — pure neutral dark, zero warmth ── */
[data-theme="dark"] {
  --bg:       #0d0d0d;
  --surface:  #1a1a1a;
  --text:     #efefef;
  --muted:    #666666;
  --border:   #282828;
  --hero-size: clamp(52px, 6vw, 72px);
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background 0.25s, color 0.25s;
}

/* ── Container ── */
.container {
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  transition: background 0.25s, border-color 0.25s;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 5px;
  text-decoration: none;
  cursor: pointer;
}

.brand-logo {
  height: 22px;
  max-height: 22px;
  max-width: 90px;
  width: auto;
  display: block;
  object-fit: contain;
  opacity: 0.85;
  transition: opacity 0.15s;
}

.brand:hover .brand-logo { opacity: 1; }

.brand-name {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--text);
  transition: color 0.25s;
}

.brand-logo-link {
  cursor: pointer;
}

/* ── Nav ── */
.main-nav {
  display: flex;
  align-items: center;
  gap: 2px;
}

.main-nav a {
  text-decoration: none;
  color: var(--muted);
  padding: 5px 10px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: color 0.15s;
  border-radius: 0;
  background: none;
}

.main-nav a.active,
.main-nav a:hover {
  color: var(--text);
  background: none;
}

/* ── Theme toggle ── */
#theme-toggle {
  appearance: none;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  padding: 4px 9px;
  border-radius: 4px;
  font-size: 12px;
  margin-left: 10px;
  transition: color 0.15s, border-color 0.15s;
  letter-spacing: 0.02em;
}

#theme-toggle:hover {
  color: var(--text);
  border-color: var(--text);
}

/* ── Main ── */
main.container {
  padding-top: 64px;
  padding-bottom: 100px;
}

/* ── Hero ── */
.hero {
  padding-bottom: 52px;
  border-bottom: 1px solid var(--border);
}

.corner-photo {
  position: fixed;
  right: 8px;
  width: 148px;
  height: auto;
  display: block;
  border-radius: 2px 0 0 2px;
  z-index: 5;
  pointer-events: none;
}

/* ── Left slideshow ── */
.slideshow-left {
  position: fixed;
  left: 14px;
  top: 50%;
  transform: translateY(-44%);
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 5;
  pointer-events: none;
}

.slide-slot {
  width: 140px;
  height: 96px;
  overflow: hidden;
  border-radius: 2px;
  background: var(--border);
}

.slide-slot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: opacity 0.5s ease;
  border-radius: 2px;
}

.hero h1 {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: var(--hero-size);
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin: 0 0 24px 0;
  color: var(--text);
  transition: font-size 0.25s;
}

.lead {
  font-size: 16px;
  line-height: 1.72;
  color: var(--muted);
  max-width: 660px;
  margin: 0 0 28px 0;
}

.social-row {
  display: flex;
  align-items: center;
  gap: 0;
  flex-wrap: wrap;
}

.social-row a {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  padding-bottom: 1px;
  border-bottom: 1px solid var(--border);
  transition: border-color 0.15s, color 0.15s;
}

.social-row a:hover {
  border-bottom-color: var(--text);
}

.social-sep {
  color: var(--border);
  margin: 0 10px;
  font-size: 13px;
  user-select: none;
}

/* ── Latest (home) ── */
.latest {
  margin-top: 52px;
}

.section-label {
  font-family: 'Syne', sans-serif;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 16px;
}

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

.post-list li {
  border-top: 1px solid var(--border);
}

.post-list li:last-child {
  border-bottom: 1px solid var(--border);
}

.post-list a {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 13px 0;
  text-decoration: none;
  color: var(--text);
  transition: color 0.15s;
}

.post-list a:hover {
  color: var(--muted);
}

.post-list-title {
  font-size: 15px;
  font-weight: 500;
}

.post-list-date {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

/* ── Blog section ── */
section[data-route="blog"] h2,
section[data-route="misc"] h2 {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: clamp(28px, 4vw, 38px);
  letter-spacing: -0.025em;
  margin: 0 0 36px 0;
  color: var(--text);
}

#blog-list {
  display: block;
}

.blog-entry {
  border-top: 1px solid var(--border);
  padding: 22px 0;
  cursor: pointer;
  transition: opacity 0.15s;
}

.blog-entry:last-child {
  border-bottom: 1px solid var(--border);
}

.blog-entry:hover {
  opacity: 0.6;
}

.blog-entry-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 7px;
}

.blog-entry-title {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.015em;
  color: var(--text);
  line-height: 1.2;
}

.blog-entry-date {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.blog-entry-desc {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
  max-width: 640px;
  margin: 0;
}

/* ── Blog post detail ── */
.post { padding-bottom: 48px; }

.post h1 {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: clamp(28px, 4vw, 44px);
  letter-spacing: -0.025em;
  margin: 0 0 8px 0;
  line-height: 1.1;
}

.post-meta {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 36px;
}

.post-content {
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 0;
  border-top: 1px solid var(--border);
  padding-top: 32px;
}

.post-content h2,
.post-content h3 {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  letter-spacing: -0.015em;
}

.post-content p      { margin: 0 0 1.2em 0; }
.post-content ul,
.post-content ol     { padding-left: 1.4em; margin: 0 0 1.2em 0; }
.post-content li     { margin-bottom: 0.4em; }
.post-content h2     { margin: 1.8em 0 0.5em 0; font-size: 22px; }
.post-content h3     { margin: 1.4em 0 0.4em 0; font-size: 18px; }

.post-content img {
  display: block;
  max-width: 72%;
  height: auto;
  margin: 1.8em auto;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.post-content pre {
  background: var(--surface);
  padding: 16px 18px;
  overflow: auto;
  border-radius: 4px;
  font-size: 13px;
  line-height: 1.55;
  margin-bottom: 1.2em;
}

.post-content code {
  background: var(--surface);
  padding: 2px 5px;
  border-radius: 3px;
  font-size: 13px;
}

.post-content pre code {
  background: none;
  padding: 0;
  border-radius: 0;
}

.post-content blockquote {
  border-left: 2px solid var(--border);
  margin: 0 0 1.2em 0;
  padding: 4px 18px;
  color: var(--muted);
}

.post-nav { margin-top: 36px; }

/* ── Text-link button (back link, etc.) ── */
.btn {
  display: inline-block;
  text-decoration: none;
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1px;
  transition: border-color 0.15s;
  background: none;
  cursor: pointer;
}

.btn:hover {
  border-bottom-color: var(--text);
}

/* ── Misc section ── */
section[data-route="misc"] .misc-desc {
  color: var(--muted);
  font-size: 16px;
  max-width: 560px;
  line-height: 1.7;
}

/* ── Footer ── */
.site-footer {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  height: 48px;
  background: var(--bg);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  z-index: 10;
  transition: background 0.25s, border-color 0.25s;
}

.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-copy {
  font-size: 13px;
  color: var(--muted);
}

/* ── Responsive ── */
@media (max-width: 1199px) {
  .corner-photo { display: none; }
  .slideshow-left { display: none; }
}

@media (max-width: 640px) {
  .brand-name { display: none; }
  .main-nav a { padding: 5px 7px; font-size: 13px; }
  .blog-entry-header { flex-direction: column; gap: 4px; }
  .post-list a { flex-direction: column; gap: 2px; }
}