/* ============================================================
   REIDWALLACE.COM — Custom Hugo Theme
   Theme switcher via CSS custom properties
   ============================================================ */

/* ---------- THEME VARIABLES ---------- */

:root,
[data-theme="dark"] {
  --bg:          #0d1117;
  --bg-card:     #161b22;
  --bg-hover:    #1c2330;
  --border:      #21262d;
  --text:        #e6edf3;
  --text-muted:  #8b949e;
  --text-faint:  #484f58;
  --accent:      #58a6ff;
  --accent-glow: rgba(88, 166, 255, 0.15);
  --accent-2:    #3fb950;
  --tag-bg:      #1f2937;
  --tag-text:    #8b949e;
  --tag-active-bg:   #1d3a5e;
  --tag-active-text: #58a6ff;
  --progress:    #58a6ff;
  --code-bg:     #161b22;
  --code-border: #30363d;
  --link:        #58a6ff;
  --link-hover:  #79b8ff;
}

[data-theme="light"] {
  --bg:          #ffffff;
  --bg-card:     #f6f8fa;
  --bg-hover:    #eef1f4;
  --border:      #d0d7de;
  --text:        #1f2328;
  --text-muted:  #636c76;
  --text-faint:  #b1bac4;
  --accent:      #0969da;
  --accent-glow: rgba(9, 105, 218, 0.1);
  --accent-2:    #1a7f37;
  --tag-bg:      #eef1f4;
  --tag-text:    #636c76;
  --tag-active-bg:   #dbeafe;
  --tag-active-text: #0969da;
  --progress:    #0969da;
  --code-bg:     #f6f8fa;
  --code-border: #d0d7de;
  --link:        #0969da;
  --link-hover:  #0550ae;
}

[data-theme="cyber"] {
  --bg:          #050510;
  --bg-card:     #0a0a1a;
  --bg-hover:    #0d0d22;
  --border:      #1a1a3e;
  --text:        #e0e0ff;
  --text-muted:  #8888cc;
  --text-faint:  #444488;
  --accent:      #a78bfa;
  --accent-glow: rgba(167, 139, 250, 0.2);
  --accent-2:    #34d399;
  --tag-bg:      #12122a;
  --tag-text:    #8888cc;
  --tag-active-bg:   #2d1b69;
  --tag-active-text: #a78bfa;
  --progress:    #a78bfa;
  --code-bg:     #0a0a1a;
  --code-border: #1a1a3e;
  --link:        #a78bfa;
  --link-hover:  #c4b5fd;
}

/* ---------- RESET & BASE ---------- */

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

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  transition: background 0.2s, color 0.2s;
  min-height: 100vh;
}

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

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

/* ---------- READING PROGRESS BAR ---------- */

#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--progress);
  z-index: 1000;
  transition: width 0.1s linear;
  box-shadow: 0 0 8px var(--accent-glow);
}

/* ---------- HEADER / NAV ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}
.site-logo:hover { color: var(--accent); }
.site-logo .logo-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  transition: color 0.15s, background 0.15s;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  background: var(--bg-card);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Theme toggle */
.theme-switcher {
  display: flex;
  gap: 0.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 3px;
}

.theme-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.3rem 0.5rem;
  border-radius: 5px;
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: background 0.15s, color 0.15s;
  line-height: 1;
}
.theme-btn:hover,
.theme-btn.active {
  background: var(--bg-hover);
  color: var(--text);
}
.theme-btn.active { color: var(--accent); }

/* ---------- LAYOUT ---------- */

.page-wrapper {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- HERO (Homepage) ---------- */

.hero {
  padding: 4rem 0 3rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 3rem;
}

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 1rem;
}

.hero-tagline {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 600px;
  line-height: 1.6;
}

/* ---------- BLOG LISTING ---------- */

.blog-header {
  padding: 2.5rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

.blog-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.blog-header p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ---------- CATEGORY FILTER ---------- */

.category-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.filter-btn {
  background: var(--tag-bg);
  border: 1px solid var(--border);
  color: var(--tag-text);
  border-radius: 20px;
  padding: 0.35rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

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

.filter-btn.active {
  background: var(--tag-active-bg);
  border-color: var(--accent);
  color: var(--tag-active-text);
  font-weight: 600;
}

/* ---------- POST CARDS ---------- */

.post-grid {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.post-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s;
  text-decoration: none;
  color: inherit;
}

.post-card:first-child { border-top: 1px solid var(--border); }

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

.post-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}

.post-category {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 0.15rem 0.6rem;
  border-radius: 4px;
}

.post-date {
  font-size: 0.8rem;
  color: var(--text-faint);
}

.post-reading-time {
  font-size: 0.8rem;
  color: var(--text-faint);
}

.post-card-title {
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 0.5rem;
  transition: color 0.15s;
}

.post-card-summary {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}

.tag-pill {
  font-size: 0.72rem;
  background: var(--tag-bg);
  color: var(--tag-text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1rem 0.5rem;
}

.post-card-arrow {
  color: var(--text-faint);
  font-size: 1.25rem;
  align-self: center;
  transition: color 0.15s, transform 0.15s;
  flex-shrink: 0;
}
.post-card:hover .post-card-arrow {
  color: var(--accent);
  transform: translateX(3px);
}

/* ---------- SINGLE POST ---------- */

.post-header {
  padding: 2.5rem 0 2rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

.post-header-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.post-header h1 {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

.post-description {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.post-meta-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.post-meta-row .sep { color: var(--text-faint); }

/* Post content */

.post-content {
  max-width: 720px;
  margin: 0 auto;
  font-size: 1rem;
  line-height: 1.8;
}

.post-content h2 {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin: 2.5rem 0 1rem;
  padding-top: 0.5rem;
}

.post-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  margin: 2rem 0 0.75rem;
}

.post-content h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  margin: 1.5rem 0 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.85rem;
}

.post-content p { margin-bottom: 1.4rem; }

.post-content a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.post-content a:hover { color: var(--link-hover); }

.post-content ul,
.post-content ol {
  margin: 0 0 1.4rem 1.5rem;
}

.post-content li { margin-bottom: 0.4rem; }

.post-content strong { color: var(--text); font-weight: 600; }

.post-content em { color: var(--text-muted); }

.post-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--bg-card);
  border-radius: 0 8px 8px 0;
  color: var(--text-muted);
  font-style: italic;
}

.post-content code {
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: 0.85em;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--accent);
}

.post-content pre {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 8px;
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}

.post-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
  font-size: 0.875rem;
}

.post-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.post-content th {
  background: var(--bg-card);
  font-weight: 600;
  text-align: left;
  padding: 0.6rem 1rem;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.post-content td {
  padding: 0.6rem 1rem;
  border: 1px solid var(--border);
}

.post-content tr:nth-child(even) td { background: var(--bg-card); }

/* ---------- POST FOOTER / BACK LINK ---------- */

.post-footer {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.15s;
}
.back-link:hover { color: var(--accent); }

.post-tags-footer {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

/* ---------- PAGINATION ---------- */

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 2.5rem 0;
}

.page-link {
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.875rem;
  color: var(--text-muted);
  background: var(--bg-card);
  transition: all 0.15s;
}
.page-link:hover,
.page-link.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}
.page-link.active { font-weight: 600; }

/* ---------- FOOTER ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  margin-top: 4rem;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-faint);
}

.footer-links {
  display: flex;
  gap: 1rem;
  list-style: none;
}

.footer-links a {
  font-size: 0.8rem;
  color: var(--text-faint);
  transition: color 0.15s;
}
.footer-links a:hover { color: var(--text-muted); }

/* ---------- UTILITY ---------- */

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); border: 0;
}

/* ---------- RESPONSIVE ---------- */

@media (max-width: 640px) {
  .nav-links { display: none; }
  .post-card { grid-template-columns: 1fr; }
  .post-card-arrow { display: none; }
  .theme-switcher .theme-btn:not(.active) span { display: none; }
  .footer-inner { flex-direction: column; text-align: center; }
}

@media (max-width: 768px) {
  .hero { padding: 2.5rem 0 2rem; }
  .post-content { font-size: 0.975rem; }
}