/* Editorial Minimalism — Signal Over Noise, With Personality */

/* ============================================================
   1. DESIGN TOKENS
   ============================================================ */
:root {
  /* Typography - Distinctive but Practical */
  --font-serif: 'Source Serif 4', Charter, 'Bitstream Charter', Georgia, serif;
  --font-sans: 'Source Sans 3', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

  /* Type Scale (5 sizes only) */
  --text-sm: 0.875rem;
  /* 14px - dates, meta */
  --text-base: 1.125rem;
  /* 18px - body text */
  --text-lg: 1.5rem;
  /* 24px - subheadings */
  --text-xl: 2.5rem;
  /* 40px - article titles */
  --text-hero: 3.5rem;
  /* 56px - homepage headline */

  /* Warm Monochrome + Accent */
  --ink: #1c1917;
  --ink-secondary: #57534e;
  --ink-muted: #a8a29e;
  --paper: #fafaf9;
  --paper-alt: #f5f5f4;
  --rule: #e7e5e4;
  --accent: #B5835A;
  --accent-hover: #9A6D45;

  /* Spacing (3 values only) */
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;

  /* Motion */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

/* Dark Mode - Attribute based + System preference fallback */
html[data-theme="dark"] {
  --ink: #e7e5e4;
  --ink-secondary: #a8a29e;
  --ink-muted: #78716c;
  --paper: #1a1816;
  --paper-alt: #211f1c;
  --rule: #2e2a27;
  --accent: #D4A574;
  --accent-hover: #E0B88A;
}

/* ============================================================
   2. RESET & BASE
   ============================================================ */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* ============================================================
   3. ACCENT STRIPE — Editorial Masthead Feel
   ============================================================ */
.accent-stripe {
  height: 3px;
  background: var(--accent);
  width: 100%;
}

/* ============================================================
   4. LAYOUT
   ============================================================ */
.container {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ============================================================
   5. HEADER
   ============================================================ */
.site-header {
  max-width: 680px;
  margin: 0 auto;
  padding: var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--rule);
}

.header-left {
  display: flex;
  align-items: center;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.site-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

.main-nav {
  display: flex;
  gap: var(--space-sm);
}

.main-nav a {
  font-size: var(--text-sm);
  color: var(--ink-secondary);
  text-decoration: none;
  position: relative;
  transition: color var(--transition-base);
}

.main-nav a:hover {
  color: var(--ink);
}

.main-nav a[aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
}

.main-nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-left: 1px solid var(--rule);
  padding-left: 0.75rem;
  margin-left: 0.25rem;
}

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  color: var(--ink-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-base);
}

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

.icon-moon {
  display: none;
}

.icon-sun {
  display: block;
}

html[data-theme="dark"] .icon-sun {
  display: none;
}

html[data-theme="dark"] .icon-moon {
  display: block;
}

.lang-switch {
  display: flex;
  font-size: var(--text-sm);
  font-weight: 600;
}

.lang-switch a {
  text-decoration: none;
  color: var(--ink-secondary);
  transition: color var(--transition-base);
}

.lang-switch a:hover {
  color: var(--accent);
}

/* ============================================================
   6. LINKS
   ============================================================ */
a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--ink-muted);
  text-underline-offset: 2px;
  transition: text-decoration-color var(--transition-base), color var(--transition-base);
}

a:hover {
  text-decoration-color: var(--accent);
  color: var(--accent);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ============================================================
   7. HOMEPAGE HERO
   ============================================================ */
.hero {
  padding: var(--space-lg) 0;
}

.hero-content {
  animation: fadeSlideUp 0.6s ease-out both;
}

.hero p {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  line-height: 1.5;
  margin: 0 0 var(--space-sm) 0;
  color: var(--ink);
}

.hero p:first-child {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--ink);
}

/* ============================================================
   8. SECTION LABEL
   ============================================================ */
.section-label {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: var(--space-lg) 0 var(--space-sm) 0;
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--rule);
  animation: fadeSlideUp 0.6s ease-out 0.4s both;
}

/* ============================================================
   9. POST LIST
   ============================================================ */
.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-list li {
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--rule);
  transition: transform var(--transition-base);
  animation: fadeSlideUp 0.5s ease-out both;
}

.post-list li:nth-child(1) {
  animation-delay: 0.45s;
}

.post-list li:nth-child(2) {
  animation-delay: 0.5s;
}

.post-list li:nth-child(3) {
  animation-delay: 0.55s;
}

.post-list li:nth-child(4) {
  animation-delay: 0.6s;
}

.post-list li:nth-child(5) {
  animation-delay: 0.65s;
}

.post-list li:nth-child(6) {
  animation-delay: 0.7s;
}

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

.post-list li:hover {
  transform: translateX(3px);
}

.post-list a {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  display: block;
  line-height: 1.3;
  transition: color var(--transition-base);
}

.post-list a:hover {
  color: var(--accent);
  text-decoration: none;
}

.post-list time {
  display: block;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--ink-muted);
  margin-top: 0.25rem;
}

/* View All Link */
.view-all {
  display: inline-block;
  margin-top: var(--space-md);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color var(--transition-base), transform var(--transition-base);
}

.view-all:hover {
  color: var(--accent-hover);
  text-decoration: none;
  transform: translateX(3px);
}

.view-all::after {
  content: " →";
}

/* ============================================================
   10. PAGE LAYOUTS (Projects & Career)
   ============================================================ */
.page-header {
  margin: var(--space-lg) 0;
  animation: fadeSlideUp 0.6s ease-out both;
}

.page-header h1 {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
  margin: 0 0 var(--space-sm) 0;
}

.page-summary {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  color: var(--ink-secondary);
  max-width: 60ch;
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.project-card {
  background: var(--paper-alt);
  border: 1px solid var(--rule);
  padding: var(--space-md);
  border-radius: 6px;
  transition: transform var(--transition-base), border-color var(--transition-base);
  animation: fadeSlideUp 0.6s ease-out both;
}

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

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-sm);
}

.project-header h2 {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 600;
  margin: 0;
  line-height: 1.2;
}

.project-link {
  color: var(--ink-muted);
  text-decoration: none;
}

.project-link:hover {
  color: var(--accent);
}

.project-card p {
  font-size: var(--text-sm);
  color: var(--ink-secondary);
  margin: 0 0 var(--space-md) 0;
  line-height: 1.6;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-muted);
  background: var(--paper);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  border: 1px solid var(--rule);
}

/* Career Timeline */
.timeline {
  border-left: 2px solid var(--rule);
  padding-left: var(--space-md);
  margin-bottom: var(--space-lg);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-lg);
  animation: fadeSlideUp 0.6s ease-out both;
}

.timeline-marker {
  position: absolute;
  left: calc(var(--space-md) * -1 - 5px);
  top: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--accent);
}

.role-header {
  margin-bottom: 0.25rem;
}

.role-header h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0;
  display: inline-block;
}

.company {
  color: var(--ink-secondary);
  margin-left: 0.5rem;
}

.meta-row {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-muted);
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.meta-row .period::after {
  content: "•";
  margin: 0 0.5rem;
  color: var(--rule);
}

.description {
  font-size: var(--text-sm);
  color: var(--ink-secondary);
  max-width: 60ch;
}

.description p {
  margin: 0 0 0.5rem 0;
}

/* Education Grid */
.education-grid {
  display: grid;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.education-item h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  margin: 0 0 0.25rem 0;
}

.education-item .school {
  color: var(--ink-secondary);
  margin: 0 0 0.25rem 0;
}

.education-item .period-sm {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-muted);
  margin: 0;
}

/* Stack Grid */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.stack-group h3 {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-muted);
  margin: 0 0 var(--space-sm) 0;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.5rem;
}

.stack-group ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.stack-group li {
  font-size: var(--text-sm);
  color: var(--ink);
  margin-bottom: 0.25rem;
}

/* ============================================================
   11. ARTICLE LAYOUT
   ============================================================ */
.article {
  padding-bottom: var(--space-lg);
}

.article-header {
  margin-bottom: var(--space-md);
  padding: var(--space-lg) 0 var(--space-md) 0;
  animation: fadeSlideUp 0.6s ease-out both;
}

.article h1 {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 var(--space-sm) 0;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--ink-muted);
}

.article-meta .separator {
  color: var(--rule);
}

.article time {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--ink-muted);
}

/* ============================================================
   12. ARTICLE CONTENT
   ============================================================ */
.article-content {
  max-width: 65ch;
  animation: fadeSlideUp 0.6s ease-out 0.15s both;
}

.article-content p {
  margin: 0 0 var(--space-sm) 0;
  color: var(--ink);
}

.article-content h2 {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 600;
  margin: var(--space-md) 0 var(--space-sm) 0;
  color: var(--ink);
}

.article-content h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  margin: var(--space-md) 0 var(--space-sm) 0;
  color: var(--ink);
}

.article-content h4,
.article-content h5,
.article-content h6 {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 600;
  margin: var(--space-sm) 0;
  color: var(--ink);
}

.article-content ul,
.article-content ol {
  margin: 0 0 var(--space-sm) 0;
  padding-left: var(--space-md);
  color: var(--ink);
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: var(--space-sm);
  margin: var(--space-md) 0;
  color: var(--ink-secondary);
  font-style: italic;
}

.article-content blockquote p {
  color: var(--ink-secondary);
}

.article-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--paper-alt);
  padding: 0.15em 0.35em;
  border-radius: 3px;
  color: var(--ink);
  border: 1px solid var(--rule);
}

.article-content pre {
  background: var(--paper-alt);
  padding: var(--space-sm);
  border-radius: 4px;
  overflow-x: auto;
  margin: var(--space-md) 0;
  border-left: 3px solid var(--accent);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
}

.article-content pre code {
  background: none;
  padding: 0;
  font-size: var(--text-sm);
  border: none;
}

.article-content a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 2px;
  transition: color var(--transition-base), text-decoration-color var(--transition-base);
}

.article-content a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

/* ============================================================
   13. TAGS
   ============================================================ */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: var(--space-md) 0 0 0;
}

.tags li {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--ink-muted);
  transition: color var(--transition-base);
}

.tags li::before {
  content: "#";
  color: var(--accent);
}

.tags li:hover {
  color: var(--ink-secondary);
}

/* ============================================================
   14. PAGE CONTENT (About, Now)
   ============================================================ */
.page-content {
  max-width: 65ch;
  padding: var(--space-md) 0;
}

.page-content h1 {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 var(--space-md) 0;
  color: var(--ink);
}

.page-content p {
  margin: 0 0 var(--space-sm) 0;
  color: var(--ink);
}

.page-content h2 {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 600;
  margin: var(--space-md) 0 var(--space-sm) 0;
  color: var(--ink);
}

.page-content h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  margin: var(--space-md) 0 var(--space-sm) 0;
  color: var(--ink);
}

.page-content ul,
.page-content ol {
  margin: 0 0 var(--space-sm) 0;
  padding-left: var(--space-md);
}

.page-content li {
  margin-bottom: 0.5rem;
}

.page-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: var(--space-sm);
  margin: var(--space-md) 0;
  color: var(--ink-secondary);
  font-style: italic;
}

.page-content a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 2px;
  transition: color var(--transition-base), text-decoration-color var(--transition-base);
}

.page-content a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

/* ============================================================
   15. FOOTER
   ============================================================ */
.site-footer {
  max-width: 680px;
  margin: var(--space-lg) auto 0;
  padding: var(--space-md);
  border-top: 1px solid var(--rule);
  color: var(--ink-muted);
  font-size: var(--text-sm);
  text-align: center;
}

/* ============================================================
   16. ANIMATIONS
   ============================================================ */
@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================================
   17. RESPONSIVE
   ============================================================ */
@media (max-width: 640px) {
  :root {
    --text-hero: 2.25rem;
    --text-xl: 1.75rem;
    --text-lg: 1.25rem;
  }

  .container {
    padding: 0 var(--space-sm);
  }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-sm);
  }

  .header-right {
    width: 100%;
    justify-content: space-between;
  }

  .main-nav {
    gap: var(--space-sm);
    flex-wrap: wrap;
  }

  .hero {
    padding: var(--space-md) 0;
  }

  .article-header {
    padding: var(--space-md) 0 var(--space-sm) 0;
  }

  .article-meta {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
}