/* ============================================================
   Variables
   ============================================================ */
:root {
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  --radius:    6px;
  --radius-lg: 10px;

  /* Dark palette (used everywhere) */
  --dark-bg:         #1b1e27;
  --dark-surface:    #232837;
  --dark-surface-2:  #2a3045;
  --dark-border:     #2e364d;
  --dark-text:       #e2e8f0;
  --dark-text-muted: #8892a4;

  /* Accent colours */
  --green:       #4ade80;
  --green-hover: #22c55e;
  --green-dim:   rgba(74, 222, 128, 0.10);
  --green-border: rgba(74, 222, 128, 0.30);
  --yellow:      #fbbf24;
  --yellow-dim:  rgba(251, 191, 36, 0.13);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--dark-bg);
  color: var(--dark-text);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

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

/* ============================================================
   Layout
   ============================================================ */
.container {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

body.article-page .container {
  max-width: 740px;
}

/* ============================================================
   STICKY TOP NAV (both pages)
   ============================================================ */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--dark-bg);
  border-bottom: 1px solid var(--dark-border);
  padding: .75rem 0;
}

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

.site-nav-logo {
  font-size: .9rem;
  font-weight: 600;
  color: var(--dark-text);
  letter-spacing: -.01em;
  transition: color .15s;
}
.site-nav-logo:hover { color: var(--green); text-decoration: none; }

.site-nav-dot {
  color: var(--green);
  margin: 0 .35rem;
}

.site-nav-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.site-nav-links a {
  font-size: .82rem;
  color: var(--dark-text-muted);
  font-weight: 500;
  transition: color .15s;
}
.site-nav-links a:hover { color: var(--green); text-decoration: none; }

/* ============================================================
   HOME PAGE — Header
   ============================================================ */
.site-header {
  padding: 3rem 0 2.5rem;
  background: var(--dark-surface);
  border-bottom: 1px solid var(--dark-border);
}

.site-eyebrow {
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: .5rem;
}

.site-title {
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--dark-text);
  margin-bottom: .4rem;
}

.site-subtitle {
  color: var(--dark-text-muted);
  font-size: 1rem;
}

/* ============================================================
   HOME PAGE — About section
   ============================================================ */
.about-section {
  padding: 2rem 0 0;
}

.about-card {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  background: var(--dark-surface);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.about-avatar {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--dark-surface-2);
  border: 2px solid var(--green-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .85rem;
  font-weight: 700;
  color: var(--green);
  letter-spacing: .04em;
}

.about-body {
  flex: 1;
  min-width: 0;
}

.about-heading {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--dark-text);
  margin-bottom: .4rem;
  letter-spacing: -.01em;
}

.about-role {
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--green);
  margin-bottom: .75rem;
}

.about-bio {
  font-size: .95rem;
  color: var(--dark-text-muted);
  line-height: 1.65;
  margin-bottom: .9rem;
}

.about-interests {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin-bottom: 1rem;
}

.interest-tag {
  display: inline-block;
  font-size: .75rem;
  font-weight: 500;
  padding: .2rem .65rem;
  border-radius: 999px;
  background: var(--dark-surface-2);
  border: 1px solid var(--dark-border);
  color: var(--dark-text-muted);
}

.about-links {
  display: flex;
  gap: 1rem;
}

.about-links a {
  font-size: .82rem;
  font-weight: 500;
  color: var(--dark-text-muted);
  transition: color .15s;
}
.about-links a:hover { color: var(--green); text-decoration: none; }

/* ============================================================
   HOME PAGE — Controls (Search only)
   ============================================================ */
.controls {
  margin: 2rem 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* ============================================================
   HOME PAGE — View-all CTA + Latest section header
   ============================================================ */
.view-all-cta {
  display: flex;
  justify-content: center;
  margin: .5rem 0 2rem;
}

.latest-section-header {
  border-top: 1px solid var(--dark-border);
  padding-top: 1.75rem;
  margin-bottom: 1.25rem;
}

.section-title {
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--dark-text-muted);
}

.view-all-btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .6rem 1.5rem;
  border: 1px solid var(--green-border);
  border-radius: 999px;
  background: var(--green-dim);
  color: var(--green);
  font-size: .9rem;
  font-weight: 600;
  transition: all .15s;
}
.view-all-btn:hover {
  background: var(--green);
  color: #111;
  text-decoration: none;
  border-color: var(--green);
}

/* ============================================================
   SEARCH PAGE — Compact header variant
   ============================================================ */
.site-header--compact {
  padding: 1.75rem 0 1.5rem;
}
.site-header--compact .site-title { font-size: 1.9rem; }

/* ============================================================
   SEARCH PAGE — Controls row (search + sort + filter toggle)
   ============================================================ */
.search-controls {
  margin: 2rem 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.search-controls-row {
  display: flex;
  gap: .65rem;
  align-items: center;
}

.search-controls-row .search-input {
  flex: 1;
  min-width: 0;
}

.sort-select {
  padding: .6rem .85rem;
  font-size: .85rem;
  font-family: var(--font-sans);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  background: var(--dark-surface);
  color: var(--dark-text-muted);
  outline: none;
  cursor: pointer;
  transition: border-color .15s, color .15s;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%238892a4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right .65rem center;
  padding-right: 2rem;
  white-space: nowrap;
}
.sort-select:hover,
.sort-select:focus {
  border-color: var(--green);
  color: var(--dark-text);
}
.sort-select option {
  background: var(--dark-surface);
  color: var(--dark-text);
}

.filter-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  padding: .6rem 1rem;
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  background: var(--dark-surface);
  color: var(--dark-text-muted);
  font-size: .85rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all .15s;
  white-space: nowrap;
}
.filter-toggle-btn:hover {
  border-color: var(--green-border);
  color: var(--green);
}
.filter-toggle-btn[aria-expanded="true"] {
  background: var(--green-dim);
  border-color: var(--green);
  color: var(--green);
}

.filter-toggle-icon {
  font-size: .75rem;
}

.tag-filters--hidden {
  display: none;
}

/* ============================================================
   SEARCH PAGE — Results header
   ============================================================ */
.results-header {
  font-size: .8rem;
  color: var(--dark-text-muted);
  margin-bottom: .75rem;
  padding-left: .1rem;
}

/* ============================================================
   SEARCH PAGE — Load more
   ============================================================ */
.load-more-cta {
  display: flex;
  justify-content: center;
  margin: 1.5rem 0 3rem;
}

.load-more-btn {
  padding: .65rem 2rem;
  border: 1px solid var(--dark-border);
  border-radius: 999px;
  background: var(--dark-surface);
  color: var(--dark-text-muted);
  font-size: .9rem;
  font-family: var(--font-sans);
  font-weight: 500;
  cursor: pointer;
  transition: all .15s;
}
.load-more-btn:hover {
  border-color: var(--green-border);
  color: var(--green);
  background: var(--green-dim);
}

.search-input {
  width: 100%;
  padding: .65rem 1rem;
  font-size: .95rem;
  font-family: var(--font-sans);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  background: var(--dark-surface);
  color: var(--dark-text);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.search-input:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px var(--green-dim);
  background: var(--dark-surface-2);
}
.search-input::placeholder { color: var(--dark-text-muted); }

.tag-filters {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
}

.tag-btn {
  padding: .3rem .75rem;
  border: 1px solid var(--dark-border);
  border-radius: 999px;
  background: var(--dark-surface);
  color: var(--dark-text-muted);
  font-size: .8rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all .15s;
}
.tag-btn:hover  { border-color: var(--green-border); color: var(--green); }
.tag-btn.active {
  background: var(--green-dim);
  border-color: var(--green);
  color: var(--green);
  font-weight: 600;
}

/* ============================================================
   HOME PAGE — Article List & Cards
   ============================================================ */
.article-list {
  display: grid;
  gap: 1rem;
  margin-bottom: 3rem;
}

.article-card {
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  background: var(--dark-surface);
  transition: border-color .15s, box-shadow .15s, transform .15s;
}
.article-card:hover {
  border-color: var(--green);
  box-shadow: 0 0 0 1px var(--green-border), 0 6px 24px rgba(74, 222, 128, 0.07);
  transform: translateY(-2px);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: .5rem;
  flex-wrap: wrap;
  margin-bottom: .75rem;
}

.card-date {
  font-size: .8rem;
  color: var(--dark-text-muted);
  margin-left: auto;
}

.card-title {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -.01em;
  margin-bottom: .5rem;
  line-height: 1.35;
}
.card-title a { color: var(--dark-text); }
.card-title a:hover { color: var(--green); text-decoration: none; }

.card-description {
  color: var(--dark-text-muted);
  font-size: .9rem;
  line-height: 1.55;
  margin-bottom: 1rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
}

/* ============================================================
   Badges
   ============================================================ */
.badge {
  display: inline-block;
  font-size: .72rem;
  font-weight: 600;
  padding: .2rem .55rem;
  border-radius: 999px;
  letter-spacing: .02em;
  white-space: nowrap;
}
.badge-type       { background: var(--yellow-dim); color: var(--yellow); }
.badge-difficulty { background: var(--green-dim);  color: var(--green); }

/* ============================================================
   Tags (pills)
   ============================================================ */
.tag {
  display: inline-block;
  font-size: .75rem;
  padding: .2rem .6rem;
  border-radius: 999px;
  background: var(--dark-surface-2);
  color: var(--dark-text-muted);
  cursor: pointer;
  transition: all .15s;
}
.tag:hover, .tag.active {
  background: var(--green-dim);
  color: var(--green);
}

.tag-static {
  display: inline-block;
  font-size: .75rem;
  padding: .2rem .6rem;
  border-radius: 999px;
  background: var(--dark-surface-2);
  color: var(--dark-text-muted);
}

/* ============================================================
   Empty & Error States
   ============================================================ */
.no-results, .error {
  padding: 2rem 0;
  color: var(--dark-text-muted);
  font-size: .95rem;
}

/* ============================================================
   HOME PAGE — Site Footer
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--dark-border);
  padding: 1.5rem 0;
}
.site-footer p   { font-size: .82rem; color: var(--dark-text-muted); }
.site-footer a   { color: var(--green); }
.site-footer a:hover { color: var(--green-hover); }

/* ============================================================
   ARTICLE PAGE — Header
   ============================================================ */
.article-header {
  padding: 2rem 0 1.75rem;
  background: var(--dark-surface);
  border-bottom: 1px solid var(--dark-border);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  font-size: .85rem;
  color: var(--dark-text-muted);
  margin-bottom: 1rem;
  transition: color .15s;
}
.back-link:hover { color: var(--green); text-decoration: none; }

.article-meta {
  display: flex;
  align-items: center;
  gap: .5rem;
  flex-wrap: wrap;
}
.article-meta time {
  font-size: .82rem;
  color: var(--dark-text-muted);
}

/* ============================================================
   ARTICLE PAGE — Title block (top of content area)
   ============================================================ */
.article-title-block {
  padding-bottom: 2rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--dark-border);
}

.article-title-block h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -.025em;
  line-height: 1.25;
  margin-bottom: .75rem;
  color: var(--dark-text);
}

.article-description {
  font-size: 1.05rem;
  color: var(--dark-text-muted);
  line-height: 1.6;
}

/* ============================================================
   ARTICLE PAGE — Content (dark, same shade as home cards)
   ============================================================ */
body.article-page main.article-content {
  background: var(--dark-surface);
  padding-top: 2.5rem;
  padding-bottom: 3rem;
}

.article-content {
  color: var(--dark-text);
}

.article-content h2 {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -.015em;
  margin: 2.5rem 0 .75rem;
  color: var(--dark-text);
}

.article-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 2rem 0 .6rem;
  color: var(--dark-text);
}

.article-content h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 1.5rem 0 .5rem;
  color: var(--dark-text);
}

.article-content p {
  margin-bottom: 1.25rem;
  line-height: 1.75;
}

.article-content ul,
.article-content ol {
  margin: 0 0 1.25rem 1.5rem;
  line-height: 1.75;
}

.article-content li { margin-bottom: .35rem; }

.article-content strong { font-weight: 600; }
.article-content em { font-style: italic; }

.article-content a {
  color: var(--green);
  font-weight: 500;
}
.article-content a:hover { color: var(--green-hover); }

.article-content blockquote {
  border-left: 3px solid var(--green);
  padding: .75rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--dark-surface-2);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--dark-text-muted);
  font-style: italic;
}

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

/* Inline code */
.article-content code:not(pre code) {
  font-family: var(--font-mono);
  font-size: .85em;
  background: var(--dark-surface-2);
  border: 1px solid var(--dark-border);
  border-radius: 4px;
  padding: .1em .4em;
  color: var(--dark-text);
}

/* Code blocks */
.article-content pre {
  margin: 1.5rem 0;
  border-radius: var(--radius);
  overflow: auto;
  font-size: .85rem;
  line-height: 1.6;
  background: var(--dark-bg);
  border-left: 3px solid var(--green);
  padding: 1.25rem 1.5rem;
  color: #abb2bf; /* readable fallback when hljs doesn't apply */
}
.article-content pre code {
  font-family: var(--font-mono);
  background: transparent;
  border: none;
  padding: 0;
  color: inherit;
}

/* Tables */
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: .9rem;
}
.article-content th,
.article-content td {
  text-align: left;
  padding: .6rem .9rem;
  border: 1px solid var(--dark-border);
}
.article-content th {
  background: var(--dark-surface-2);
  font-weight: 600;
  color: var(--dark-text);
}
.article-content tr:hover td { background: var(--dark-surface-2); }

/* ============================================================
   ARTICLE PAGE — Footer
   ============================================================ */
.article-footer {
  background: var(--dark-bg);
  border-top: 1px solid var(--dark-border);
  padding: 2rem 0;
}

.article-footer-inner {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.article-footer-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  align-items: center;
}
.article-footer-tags .label {
  font-size: .8rem;
  font-weight: 600;
  color: var(--dark-text-muted);
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-right: .25rem;
}

.article-footer .back-link {
  color: var(--dark-text-muted);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 640px) {
  .site-title { font-size: 1.9rem; }
  .site-header { padding: 3.5rem 0 3rem; }
  .article-header h1 { font-size: 1.5rem; }
  .card-date { margin-left: 0; }
  .site-nav-logo span:not(.site-nav-dot) { display: none; }

  /* Search page controls stack on small screens */
  .search-controls-row {
    flex-wrap: wrap;
  }
  .search-controls-row .search-input {
    flex-basis: 100%;
  }
  .sort-select,
  .filter-toggle-btn {
    flex: 1;
  }
}