/* ==============================================
   Site overrides on top of Pico CSS
   ============================================== */

/* ── Custom colour tokens ──────────────────────
   Override Pico's dark palette with a richer,
   more vibrant dark scheme.
   ─────────────────────────────────────────── */
:root,
[data-theme="dark"] {
  --bg:          #0d1117;
  --bg-card:     #161b22;
  --bg-card-hover: #1c2430;
  --border:      #21262d;
  --border-accent: #30363d;
  --accent:      #58a6ff;      /* bright blue */
  --accent2:     #bc8cff;      /* violet */
  --accent3:     #3fb950;      /* green */
  --accent4:     #f78166;      /* coral */
  --accent5:     #ffa657;      /* amber */
  --text:        #e6edf3;
  --muted:       #8b949e;
  --pico-background-color: var(--bg);
  --pico-card-background-color: var(--bg-card);
  --pico-primary: var(--accent);
  --pico-primary-hover: #79b8ff;
  --pico-color: var(--text);
  --pico-muted-color: var(--muted);
  --pico-muted-border-color: var(--border);
}

[data-theme="light"] {
  --bg:          #ffffff;
  --bg-card:     #f6f8fa;
  --bg-card-hover: #eef1f6;
  --border:      #d0d7de;
  --border-accent: #c3ccd4;
  --accent:      #0969da;
  --accent2:     #8250df;
  --accent3:     #1a7f37;
  --accent4:     #cf222e;
  --accent5:     #bf8700;
  --text:        #1f2328;
  --muted:       #656d76;
}

/* ── Base ────────────────────────────────────── */
body {
  background: var(--bg);
  color: var(--text);
}

/* ── Nav ─────────────────────────────────────── */
header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

header nav {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.75rem 2rem;
}

header nav .site-name {
  font-family: 'Roboto Slab', serif;
  font-weight: 900;
  font-size: 1.65rem;
  text-decoration: none;
  letter-spacing: -0.03em;
  line-height: 1;
}

header nav .site-name .logo-first {
  color: var(--text);
}

header nav .site-name .logo-last {
  background: linear-gradient(90deg, #ffa657, #f78166);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

header nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
}

header nav ul li a {
  font-size: 0.875rem;
  text-decoration: none;
  color: var(--muted);
  transition: color 0.15s;
}

header nav ul li a:hover,
header nav ul li a.active {
  color: var(--accent);
}

/* Dark mode toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border-accent);
  border-radius: 20px;
  padding: 0.25rem 0.75rem;
  font-size: 0.78rem;
  cursor: pointer;
  color: var(--muted);
  line-height: 1.5;
  vertical-align: baseline;
  transition: border-color 0.15s, color 0.15s;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Main wrapper ────────────────────────────── */
main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2.5rem 2rem 4rem;
}

/* ── Homepage hero ───────────────────────────── */
.home-hero {
  padding: 3rem 0 2.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 3rem;
}

.home-hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 1rem;
  color: var(--text);
}

.home-hero h1 .highlight {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.home-hero .subtitle {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 560px;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

/* ── Tag pills ───────────────────────────────── */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.2rem 0.65rem;
  border-radius: 20px;
  border: 1px solid var(--border-accent);
  color: var(--muted);
  text-decoration: none;
  transition: border-color 0.15s, color 0.15s;
}

.tag:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Color accents per content type */
.tag-articles  { border-color: #58a6ff44; color: var(--accent); }
.tag-blog      { border-color: #bc8cff44; color: var(--accent2); }
.tag-tutorials { border-color: #3fb95044; color: var(--accent3); }
.tag-demos     { border-color: #ffa65744; color: var(--accent5); }
.tag-history   { border-color: #f7816644; color: var(--accent4); }

.card-type-history { color: var(--accent4); }

/* ── Section header ──────────────────────────── */
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  margin-top: 2.5rem;
}

.section-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.section-link {
  font-size: 0.78rem;
  color: var(--accent);
  text-decoration: none;
}

.section-link:hover {
  text-decoration: underline;
}

/* ── Main card grid ──────────────────────────── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 0;
}

.card {
  background: var(--bg-card);
  padding: 1.4rem 1.5rem;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  color: var(--text);
  transition: background 0.15s;
  position: relative;
}

.card:hover {
  background: var(--bg-card-hover);
  text-decoration: none;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: transparent;
  transition: background 0.15s;
}

.card:hover::before {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
}

.card .card-type {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin: 0;
  line-height: 1.35;
  color: var(--text);
}

.card p {
  font-size: 0.82rem;
  color: var(--muted);
  margin: 0;
  line-height: 1.5;
  flex: 1;
}

.card .card-footer {
  font-size: 0.75rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-top: 0.25rem;
  border-top: 1px solid var(--border);
}

/* ── Featured / wide card ────────────────────── */
.card-grid-featured {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 0;
}

@media (max-width: 760px) {
  .card-grid-featured {
    grid-template-columns: 1fr;
  }
}

.card-featured {
  background: var(--bg-card);
  padding: 1.8rem;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  color: var(--text);
  transition: background 0.15s;
  position: relative;
}

.card-featured:hover {
  background: var(--bg-card-hover);
  text-decoration: none;
}

.card-featured::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
}

.card-featured .card-type {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent2);
}

.card-featured h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.card-featured p {
  font-size: 0.88rem;
  color: var(--muted);
  margin: 0;
  line-height: 1.6;
  flex: 1;
}

.card-featured .card-footer {
  font-size: 0.75rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

/* ── Blog post list ──────────────────────────── */
.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.post-list li {
  display: flex;
  gap: 1.25rem;
  padding: 1.1rem 1.5rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  align-items: flex-start;
  transition: background 0.15s;
  text-decoration: none;
  color: inherit;
}

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

.post-list li:hover {
  background: var(--bg-card-hover);
}

.post-list a {
  display: flex;
  gap: 1.25rem;
  width: 100%;
  text-decoration: none;
  color: inherit;
}

.post-date {
  font-size: 0.72rem;
  color: var(--muted);
  min-width: 68px;
  padding-top: 3px;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.post-info h3 {
  font-size: 0.93rem;
  font-weight: 600;
  margin: 0 0 0.25rem;
  color: var(--text);
}

.post-info p {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0 0 0.35rem;
  line-height: 1.5;
}

/* ── Article page ────────────────────────────── */
.page-hero {
  border-bottom: 1px solid var(--border);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

.page-hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}

.page-hero p {
  color: var(--muted);
  margin-bottom: 1rem;
}

.prose {
  max-width: 100%;
}

.prose h2 {
  margin-top: 2.5rem;
  font-size: 1.3rem;
  font-weight: 700;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.4rem;
}

.prose p, .prose li {
  line-height: 1.75;
}

.prose blockquote {
  border-left: 3px solid var(--accent);
  margin: 1.5rem 0;
  padding: 0.5rem 0 0.5rem 1.25rem;
  color: var(--muted);
  font-style: italic;
}

.prose blockquote cite {
  display: block;
  margin-top: 0.5rem;
  font-style: normal;
  font-size: 0.82rem;
  color: var(--muted);
}

.prose code {
  font-size: 0.85em;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  padding-bottom: 1rem;
  margin-bottom: 1.75rem;
}

.article-meta span {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

/* ── Demo page ───────────────────────────────── */
#demo-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.demo-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.2rem 1.5rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--bg-card);
  transition: background 0.15s, border-color 0.15s;
}

.demo-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
}

.demo-card h3 {
  font-size: 0.95rem;
  margin: 0 0 0.25rem;
  font-weight: 600;
}

.demo-card p {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0;
}

/* ── GitHub link ─────────────────────────────── */
.github-link {
  font-size: 0.78rem;
  color: var(--accent3);
  font-weight: 500;
}

/* ── Footer ──────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 2rem;
  text-align: center;
  font-size: 0.78rem;
  color: var(--muted);
  max-width: 1400px;
  margin: 0 auto;
}

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

footer a:hover {
  text-decoration: underline;
}

/* ── Listing pages ───────────────────────────── */
.listing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

/* ── Responsive ──────────────────────────────── */
@media (max-width: 640px) {
  header nav {
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1rem;
  }

  header nav .site-name {
    font-size: 1.35rem;
    flex: 1;
  }

  header nav ul {
    order: 3;
    width: 100%;
    gap: 0.75rem;
    flex-wrap: wrap;
    padding: 0.4rem 0 0.1rem;
    border-top: 1px solid var(--border);
  }

  header nav ul li a {
    font-size: 0.8rem;
  }

  .theme-toggle {
    order: 2;
    font-size: 0.72rem;
    padding: 0.2rem 0.6rem;
  }

  main {
    padding: 1.5rem 1rem 3rem;
  }

  .home-hero {
    padding: 2rem 0 1.5rem;
  }

  .card-grid-featured {
    grid-template-columns: 1fr;
  }
}