/* ── Fonts ──────────────────────────────────────────── */
@font-face {
  font-family: 'JetBrains Mono';
  src: url('/fonts/JetBrainsMono-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('/fonts/JetBrainsMono-Bold.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('/fonts/JetBrainsMono-Italic.woff2') format('woff2');
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}

/* ── Variables ─────────────────────────────────────── */
:root {
  --bg:       #1b1b1f;
  --bg-card:  #232328;
  --bg-hover: #2a2a30;
  --fg:       #e8e8e8;
  --fg-dim:   #8b8b8b;
  --accent:   #7aa2f7;
  --border:   #333338;
  --font:     'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
  --content-w: 720px;
  --page-w:    960px;
  --nav-h:     60px;
}

[data-theme="light"] {
  --bg:       #fafafa;
  --bg-card:  #f0f0f0;
  --bg-hover: #e8e8e8;
  --fg:       #1b1b1f;
  --fg-dim:   #666666;
  --accent:   #2563eb;
  --border:   #d4d4d4;
}

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

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.7;
  transition: background 0.2s, color 0.2s;
}

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

/* ── Layout ────────────────────────────────────────── */
.container {
  max-width: var(--page-w);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

.content {
  max-width: var(--content-w);
}

/* ── Nav ───────────────────────────────────────────── */
nav {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}

nav .site-name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--fg);
  text-decoration: none;
}

nav .nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

nav .nav-links a {
  color: var(--fg-dim);
  font-size: 0.875rem;
  transition: color 0.15s;
}
nav .nav-links a:hover,
nav .nav-links a.active {
  color: var(--fg);
  text-decoration: none;
}

.theme-toggle {
  background: none;
  border: none;
  color: var(--fg-dim);
  cursor: pointer;
  font-size: 1rem;
  padding: 4px;
  font-family: var(--font);
  transition: color 0.15s;
}
.theme-toggle:hover {
  color: var(--fg);
}

/* ── Hero (Home) ───────────────────────────────────── */
.hero {
  padding: 120px 0 80px;
  text-align: center;
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 24px;
}

.cursor {
  display: inline-block;
  width: 0.1em;
  height: 0.75em;
  background: var(--fg-dim);
  margin-left: 0.25em;
  vertical-align: baseline;
  position: relative;
  top: 0.05em;
  opacity: 0.4;
  animation: blink 1.5s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0; }
}

.hero-subtitle {
  color: var(--fg-dim);
  font-size: 1rem;
  line-height: 1.8;
  max-width: 480px;
  margin: 0 auto 32px;
}

.hero-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  font-size: 0.875rem;
}

.hero-links a {
  color: var(--fg-dim);
}
.hero-links a:hover {
  color: var(--accent);
}

/* ── Section ───────────────────────────────────────── */
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 32px;
}

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 48px 0;
}

/* ── Post List ─────────────────────────────────────── */
.year-group {
  margin-bottom: 40px;
}

.year-label {
  font-size: 0.875rem;
  color: var(--fg-dim);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}

.post-item {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 8px 0;
  text-decoration: none;
  transition: background 0.1s;
  border-radius: 4px;
}
.post-date {
  color: var(--fg-dim);
  font-size: 0.875rem;
  flex-shrink: 0;
  min-width: 6.5em;
  white-space: nowrap;
}

.post-title-link {
  color: var(--fg);
  font-size: 1rem;
  text-decoration: none;
  transition: color 0.15s;
}
.post-title-link:hover {
  color: var(--accent);
}
.post-item:hover .post-title-link {
  color: var(--accent);
}

.post-tags {
  display: inline-flex;
  gap: 8px;
  margin-left: auto;
  flex-shrink: 0;
}

.tag {
  font-size: 0.75rem;
  color: var(--fg-dim);
  border: 1px solid var(--border);
  padding: 1px 8px;
  border-radius: 3px;
  text-decoration: none;
  transition: color 0.15s, border-color 0.15s;
}
.tag:hover {
  color: var(--accent);
  border-color: var(--accent);
  text-decoration: none;
}

/* ── Post Detail ───────────────────────────────────── */
.post-header {
  margin-bottom: 40px;
  padding-top: 48px;
}

.post-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 12px;
}

.post-meta {
  color: var(--fg-dim);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.post-meta .sep::before {
  content: '\00b7';
}

.post-body {
  line-height: 1.8;
  font-size: 1rem;
}

.post-body h2 {
  font-size: 1.35rem;
  margin: 48px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.post-body h3 {
  font-size: 1.15rem;
  margin: 32px 0 12px;
}

.post-body h4 {
  font-size: 1rem;
  margin: 24px 0 8px;
  color: var(--fg-dim);
}

.post-body p {
  margin-bottom: 20px;
}

.post-body ul, .post-body ol {
  margin: 0 0 20px 24px;
}

.post-body li {
  margin-bottom: 6px;
}

.post-body blockquote {
  border-left: 3px solid var(--border);
  padding: 4px 0 4px 20px;
  margin: 20px 0;
  color: var(--fg-dim);
}

.post-body img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  margin: 24px 0;
}

.post-body figure {
  margin: 24px 0;
  text-align: center;
}

.post-body figcaption {
  font-size: 0.85rem;
  color: var(--fg-dim);
  margin-top: 8px;
}

.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.9rem;
}

.post-body th, .post-body td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}

.post-body th {
  background: var(--bg-card);
  font-weight: 700;
}

.post-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 40px 0;
}

/* ── Code ──────────────────────────────────────────── */
.post-body code {
  font-family: var(--font);
  font-size: 0.9em;
  background: var(--bg-card);
  padding: 2px 6px;
  border-radius: 3px;
}

.post-body pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 20px;
  overflow-x: auto;
  margin: 20px 0;
  line-height: 1.5;
  font-size: 0.875rem;
}

.post-body pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
}

/* shiki code blocks */
.post-body pre.shiki {
  background-color: #24292e !important;
  color: #e1e4e8 !important;
}

[data-theme="light"] .post-body pre.shiki {
  background-color: #24292e !important;
  color: #e1e4e8 !important;
}

/* ── Video ─────────────────────────────────────────── */
.video-container {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  margin: 24px 0;
}

.video-container iframe,
.video-container video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* ── Post Navigation ───────────────────────────────── */
.post-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
}

.post-nav:empty {
  display: none;
}

.post-nav a {
  color: var(--fg-dim);
}
.post-nav a:hover {
  color: var(--accent);
}

/* ── Tags Page ─────────────────────────────────────── */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 40px;
}

.tag-cloud .tag {
  font-size: 0.875rem;
  padding: 4px 12px;
}

/* ── About Page ────────────────────────────────────── */
.about-section {
  margin-bottom: 40px;
}

.about-section h2 {
  font-size: 1.1rem;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

/* ── Footer ────────────────────────────────────────── */
footer {
  margin-top: 80px;
  padding: 24px 0;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--fg-dim);
  text-align: center;
}

/* ── View All Link ─────────────────────────────────── */
.view-all {
  display: inline-block;
  margin-top: 16px;
  font-size: 0.875rem;
  color: var(--fg-dim);
}
.view-all:hover {
  color: var(--accent);
}

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 640px) {
  .container {
    padding: 0 16px;
  }

  .hero {
    padding: 80px 0 48px;
  }

  nav .nav-links {
    gap: 16px;
  }

  nav .nav-links a {
    font-size: 0.8rem;
  }

  .post-item {
    flex-direction: column;
    gap: 4px;
  }

  .post-tags {
    margin-left: 0;
  }

  .post-nav {
    flex-direction: column;
    gap: 12px;
  }
}