/* ==========================================================================
   Jeff St. Andre - Clean, Inviting & Thoughtful Engineering Site
   Palette: Deep Space Black, Stark White, Signature Olive-Chartreuse (#a9a42c)
   ========================================================================== */

:root {
  /* Core Color Palette */
  --bg-deep: #0a0c10;
  --bg-surface: #121620;
  --bg-surface-elevated: #181d2a;
  --bg-surface-hover: #1e2434;
  --bg-code: #07090d;

  /* Signature Accent: Olive-Chartreuse */
  --accent-green: #a9a42c;
  --accent-green-bright: #c7c234;
  --accent-green-muted: #726f1c;
  --accent-green-bg: rgba(169, 164, 44, 0.12);
  --accent-green-border: rgba(169, 164, 44, 0.35);

  /* Contrast & Text */
  --text-pure-white: #ffffff;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Borders */
  --border-subtle: #1e2533;
  --border-strong: #2c364a;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;

  /* Geometry */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-pill: 9999px;

  --measure-content: 740px;
  --measure-wide: 860px;

  --transition-fast: 0.15s ease;
  --transition-smooth: 0.25s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 0 1.25rem;
}

/* Selection */
::selection {
  background-color: var(--accent-green);
  color: #000000;
}

/* Links */
a {
  color: var(--accent-green-bright);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: #e5e042;
}

/* ==========================================================================
   Layout Shell
   ========================================================================== */
.site-wrapper {
  width: 100%;
  max-width: var(--measure-wide);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding-bottom: 4rem;
}

/* Header */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2.25rem 0 1.75rem 0;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.95rem;
  text-decoration: none;
}

.header-avatar {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--accent-green-border);
  object-fit: cover;
  flex-shrink: 0;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  background-color: var(--bg-surface);
}

.brand-link:hover .header-avatar {
  border-color: var(--accent-green-bright);
  box-shadow: 0 0 12px rgba(169, 164, 44, 0.3);
  transform: scale(1.04);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.brand-name {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-pure-white);
  transition: color var(--transition-fast);
}

.brand-link:hover .brand-name {
  color: var(--accent-green-bright);
}

.brand-tagline {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  font-weight: 400;
}

/* Navigation */
.site-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.nav-link {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link:hover {
  color: var(--text-pure-white);
  background-color: var(--bg-surface);
  border-color: var(--border-subtle);
}

.nav-link.active {
  color: var(--accent-green-bright);
  background-color: var(--accent-green-bg);
  border-color: var(--accent-green-border);
  font-weight: 600;
}

.ext-icon {
  font-size: 0.75rem;
  opacity: 0.8;
  color: var(--accent-green);
}

/* Main Content Area */
.site-main {
  flex-grow: 1;
  width: 100%;
}

/* Stan Lee Quote Card */
.stan-lee-quote-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2rem 2.25rem;
  margin-bottom: 2.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.stan-lee-quote {
  font-size: 1.15rem;
  font-style: italic;
  color: var(--text-pure-white);
  line-height: 1.6;
  max-width: 640px;
  margin: 0;
}

.stan-lee-meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.stan-lee-img {
  width: 110px;
  height: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.stan-lee-author {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stan-lee-author .author-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-pure-white);
}

.stan-lee-author .author-sub {
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Section Intros */
.section-header {
  margin-bottom: 2rem;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-pure-white);
  margin-bottom: 0.45rem;
}

.section-lead {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: var(--measure-content);
}

/* ==========================================================================
   Jeff St. Andre - Clean, Inviting & Thoughtful Engineering Site
   ========================================================================== */
.posts-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.post-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
  cursor: pointer;
  position: relative;
  transition: transform var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.post-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  background-color: var(--bg-surface-elevated);
}

.post-meta-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.65rem;
  flex-wrap: wrap;
}

.post-date {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.category-badge {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-green-bright);
  background: var(--accent-green-bg);
  border: 1px solid var(--accent-green-border);
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-pill);
  letter-spacing: -0.01em;
}

.post-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-pure-white);
  margin-bottom: 0.5rem;
  line-height: 1.4;
  transition: color var(--transition-fast);
}

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

.post-summary {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   Article Reading View
   ========================================================================== */
.article-container {
  max-width: var(--measure-content);
  margin: 0 auto;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  padding: 0.4rem 0.85rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.back-btn:hover {
  color: var(--text-pure-white);
  border-color: var(--accent-green-border);
  background: var(--bg-surface-elevated);
}

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

.article-meta {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-top: 1rem;
  flex-wrap: wrap;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.article-read-time {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* Markdown Body Formatting */
.markdown-body {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  color: var(--text-pure-white);
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  line-height: 1.35;
}

.markdown-body h1 { font-size: 2.1rem; }
.markdown-body h2 { 
  font-size: 1.45rem; 
  padding-bottom: 0.4rem; 
  border-bottom: 1px solid var(--border-subtle); 
}

.markdown-body h3 { font-size: 1.2rem; }

.markdown-body p {
  margin-bottom: 1.4rem;
}

.markdown-body strong {
  color: var(--text-pure-white);
  font-weight: 600;
}

.markdown-body hr {
  border: 0;
  border-top: 1px solid var(--border-subtle);
  margin: 2.5rem 0;
}

.markdown-body blockquote {
  border-left: 3px solid var(--accent-green);
  padding: 0.75rem 1.25rem;
  margin: 1.75rem 0;
  color: var(--text-secondary);
  background: var(--accent-green-bg);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.markdown-body blockquote p:last-child {
  margin-bottom: 0;
}

.markdown-body ul,
.markdown-body ol {
  margin: 1.35rem 0;
  padding-left: 1.6rem;
}

.markdown-body li {
  margin-bottom: 0.6rem;
}

.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: rgba(255, 255, 255, 0.06);
  padding: 0.2em 0.45em;
  border-radius: var(--radius-xs);
  color: var(--accent-green-bright);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.markdown-body pre {
  background: var(--bg-code) !important;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin: 1.85rem 0;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.65;
}

.markdown-body pre code {
  background: transparent;
  padding: 0;
  border: none;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.85rem 0;
  font-size: 0.9375rem;
}

.markdown-body th,
.markdown-body td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-subtle);
  text-align: left;
}

.markdown-body th {
  background: var(--bg-surface);
  font-weight: 600;
  color: var(--text-pure-white);
}

/* ==========================================================================
   Projects & Tools Grid
   ========================================================================== */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}

.tool-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.25rem;
  transition: transform var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.tool-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  background-color: var(--bg-surface-elevated);
}

.tool-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.tool-title {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text-pure-white);
}

.tool-desc {
  font-size: 0.90625rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.tool-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.85rem;
}

.tool-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-xs);
}

.tool-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent-green-bright);
  margin-top: auto;
  padding-top: 0.5rem;
}

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

/* ==========================================================================
   Slides / Presentations View
   ========================================================================== */
.slides-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.slide-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.slide-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
}

.slide-event {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-green);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.slide-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-pure-white);
  margin-bottom: 0.5rem;
}

.slide-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.slide-actions {
  display: flex;
  gap: 0.75rem;
}

.slide-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.slide-btn:hover {
  border-color: var(--accent-green-border);
  background: var(--accent-green-bg);
  color: var(--accent-green-bright);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 2rem;
  margin-top: 4rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.8125rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-separator {
  opacity: 0.4;
}

.footer-right {
  display: flex;
  gap: 1.25rem;
  font-size: 0.8125rem;
}

.footer-right a {
  color: var(--text-muted);
}

.footer-right a:hover {
  color: var(--accent-green-bright);
}

/* ==========================================================================
   Empty States & Error Handling
   ========================================================================== */
.empty-state {
  text-align: center;
  padding: 3.5rem 1.5rem;
  background: var(--bg-surface);
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
}

.empty-state p {
  margin-top: 0.5rem;
  font-size: 0.9375rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 640px) {
  body {
    padding: 0 0.875rem;
  }

  .site-header {
    padding: 1.5rem 0 1.25rem 0;
    margin-bottom: 1.75rem;
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav {
    width: 100%;
    justify-content: flex-start;
  }

  .post-card {
    padding: 1.25rem;
  }

  .tool-grid {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
}