/* ============================================
   VARIABLES & RESET
   ============================================ */
:root {
  --color-bg: #fafaf9;
  --color-surface: #ffffff;
  --color-text: #1c1917;
  --color-text-muted: #57534e;
  --color-text-light: #a8a29e;
  --color-border: #e7e5e4;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-tag-bg: #f5f5f4;

  --font-heading: 'Source Serif 4', 'Georgia', serif;
  --font-body: 'IBM Plex Sans', 'Helvetica Neue', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Menlo', monospace;

  --max-width: 720px;
  --max-width-wide: 960px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 5rem;
}

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

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

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
}

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

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

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

/* ============================================
   LAYOUT
   ============================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container--wide {
  max-width: var(--max-width-wide);
}

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page__content {
  flex: 1;
  padding: var(--spacing-2xl) 0;
}

/* ============================================
   HEADER / NAV
   ============================================ */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.site-header__name {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.site-header__name:hover {
  color: var(--color-text);
}

.site-nav {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.site-nav a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  letter-spacing: 0.01em;
  position: relative;
  padding: 0.25rem 0;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-text);
}

.site-nav a.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  color: var(--color-text);
}

.nav-toggle svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-lg) 0;
  margin-top: auto;
}

.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  color: var(--color-text-light);
}

.site-footer__links {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
}

.site-footer__links a {
  color: var(--color-text-light);
  font-size: 0.8125rem;
}

.site-footer__links a:hover {
  color: var(--color-text-muted);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; margin-bottom: var(--spacing-md); }
h3 { font-size: 1.125rem; margin-bottom: var(--spacing-sm); }

p + p { margin-top: var(--spacing-md); }

.page-intro {
  margin-bottom: var(--spacing-2xl);
}

.page-intro h1 {
  margin-bottom: var(--spacing-sm);
}

.page-intro p {
  color: var(--color-text-muted);
  font-size: 1.0625rem;
  max-width: 540px;
}

/* ============================================
   HOME / HERO
   ============================================ */
.hero {
  padding: var(--spacing-2xl) 0;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.hero__subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-lg);
  max-width: 480px;
}

.hero__links {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.hero__links a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  padding: 0.4rem 0.9rem;
  border-radius: 4px;
  transition: all 0.15s ease;
}

.hero__links a:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

.home-section {
  margin-top: var(--spacing-2xl);
}

.home-section h2 {
  font-size: 1.125rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-family: var(--font-body);
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--spacing-sm);
}

/* ============================================
   PROJECT / PORTFOLIO CARDS
   ============================================ */
.project-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.project-card {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: var(--spacing-lg);
  background: var(--color-surface);
  transition: border-color 0.15s ease;
}

.project-card:hover {
  border-color: var(--color-text-light);
}

.project-card h3 {
  margin-bottom: var(--spacing-xs);
}

.project-card h3 a {
  color: var(--color-text);
}

.project-card h3 a:hover {
  color: var(--color-accent);
}

.project-card p {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

.project-card__tags {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
  flex-wrap: wrap;
}

.tag {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background: var(--color-tag-bg);
  color: var(--color-text-muted);
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
}

/* ============================================
   CV / RESUME
   ============================================ */
.cv-section {
  margin-bottom: var(--spacing-2xl);
}

.cv-section h2 {
  font-size: 1.125rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-family: var(--font-body);
  font-weight: 500;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.cv-entry {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.cv-entry__date {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  font-family: var(--font-mono);
  padding-top: 0.15rem;
}

.cv-entry__content h3 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9375rem;
  margin-bottom: 0.15rem;
}

.cv-entry__content .cv-org {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-sm);
}

.cv-entry__content p,
.cv-entry__content ul {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.cv-entry__content ul {
  padding-left: 1.25rem;
}

.cv-entry__content ul li + li {
  margin-top: 0.25rem;
}

.cv-download {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  padding: 0.4rem 0.9rem;
  border-radius: 4px;
  margin-top: var(--spacing-md);
  transition: all 0.15s ease;
}

.cv-download:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

/* ============================================
   BLOG
   ============================================ */
.post-list {
  display: flex;
  flex-direction: column;
}

.post-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
  gap: var(--spacing-md);
}

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

.post-item__title {
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-text);
}

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

.post-item__date {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  font-family: var(--font-mono);
  white-space: nowrap;
}

/* Single blog post */
.post {
  max-width: var(--max-width);
}

.post__header {
  margin-bottom: var(--spacing-xl);
}

.post__date {
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
}

.post__body {
  font-size: 1rem;
  line-height: 1.8;
}

.post__body h2 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.post__body h3 {
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

.post__body p + p {
  margin-top: var(--spacing-md);
}

.post__body ul, .post__body ol {
  padding-left: 1.5rem;
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.post__body li + li {
  margin-top: var(--spacing-xs);
}

.post__body code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-tag-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

.post__body pre {
  background: var(--color-text);
  color: var(--color-bg);
  padding: var(--spacing-md);
  border-radius: 6px;
  overflow-x: auto;
  margin: var(--spacing-lg) 0;
  font-size: 0.875rem;
  line-height: 1.5;
}

.post__body pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.post__body blockquote {
  border-left: 3px solid var(--color-border);
  padding-left: var(--spacing-md);
  color: var(--color-text-muted);
  font-style: italic;
  margin: var(--spacing-lg) 0;
}

.post__back {
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.post__back a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ============================================
   UTILITIES
   ============================================ */
.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-toggle {
    display: block;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--spacing-md) var(--spacing-lg);
    gap: var(--spacing-sm);
  }

  .site-nav.open {
    display: flex;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .cv-entry {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .cv-entry__date {
    padding-top: 0;
  }

  .post-item {
    flex-direction: column;
    gap: 0.25rem;
  }

  .site-footer .container {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }
}