/* ============================================
   CHRIS VALDEMORO — DESIGN SYSTEM
   Palette: #111111 / #888888 / #f4f4f4 / #ffffff
   ============================================ */

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

:root {
  --black:      #111111;
  --white:      #ffffff;
  --light:      #f4f4f4;
  --mid:        #888888;
  --border:     #e2e2e2;
  --max-width:  1080px;
  --font:       'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono:  'SF Mono', 'Fira Code', 'Courier New', monospace;
  --nav-height: 64px;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--white);
  color: var(--black);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ============================================
   NAVIGATION
   ============================================ */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: var(--white);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
}

.nav-inner {
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--black);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mid);
  transition: color 0.15s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--black);
}

/* ============================================
   LAYOUT WRAPPER
   ============================================ */

.page-wrapper {
  padding-top: var(--nav-height);
  min-height: 100vh;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* ============================================
   HOMEPAGE
   ============================================ */

.home-hero {
  padding: 7rem 0 5rem;
  border-bottom: 1px solid var(--border);
}

.home-hero .eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mid);
  margin-bottom: 1.5rem;
}

.home-hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--black);
  max-width: 820px;
  margin-bottom: 2rem;
}

.home-hero .intro-text {
  font-size: 1.15rem;
  color: var(--mid);
  max-width: 560px;
  line-height: 1.75;
  margin-bottom: 2.5rem;
}

.home-hero .intro-text strong {
  color: var(--black);
  font-weight: 600;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--black);
  border-bottom: 1.5px solid var(--black);
  padding-bottom: 2px;
  transition: opacity 0.15s;
}

.hero-cta:hover { opacity: 0.5; }

/* Duality section */
.home-duality {
  padding: 5rem 0;
  border-bottom: 1px solid var(--border);
}

.duality-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.duality-col {
  padding: 3rem;
}

.duality-col:first-child {
  border-right: 1px solid var(--border);
}

.duality-col .tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--white);
  background: var(--black);
  padding: 0.3rem 0.6rem;
  margin-bottom: 1.5rem;
}

.duality-col h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
  line-height: 1.3;
}

.duality-col p {
  font-size: 0.95rem;
  color: var(--mid);
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

.duality-link {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--black);
  border-bottom: 1px solid var(--black);
  padding-bottom: 1px;
  transition: opacity 0.15s;
}

.duality-link:hover { opacity: 0.5; }

/* Recent posts on homepage */
.home-recent {
  padding: 4rem 0;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.section-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--black);
}

.section-link {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mid);
  border-bottom: 1px solid var(--mid);
  padding-bottom: 1px;
  transition: color 0.15s, border-color 0.15s;
}

.section-link:hover {
  color: var(--black);
  border-color: var(--black);
}

/* ============================================
   BLOG LISTING
   ============================================ */

.listing-header {
  padding: 5rem 0 3rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 4rem;
}

.listing-header .eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mid);
  margin-bottom: 1rem;
}

.listing-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.listing-header .listing-desc {
  font-size: 1rem;
  color: var(--mid);
  max-width: 480px;
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-bottom: 5rem;
}

.post-card {
  background: var(--white);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: background 0.15s;
}

.post-card:hover {
  background: var(--light);
}

.post-card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.post-card-date {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--mid);
}

.post-card h2 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--black);
}

.post-card p {
  font-size: 0.9rem;
  color: var(--mid);
  line-height: 1.65;
  flex: 1;
}

.post-card-cta {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--black);
  border-bottom: 1px solid var(--black);
  padding-bottom: 1px;
  align-self: flex-start;
  transition: opacity 0.15s;
}

.post-card:hover .post-card-cta { opacity: 0.5; }

/* ============================================
   SINGLE POST
   ============================================ */

.post-header {
  padding: 5rem 0 3.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 4rem;
  max-width: 720px;
}

.post-header .post-eyebrow {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.post-section-tag {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--white);
  background: var(--black);
  padding: 0.25rem 0.55rem;
}

.post-date {
  font-size: 0.78rem;
  color: var(--mid);
  letter-spacing: 0.04em;
}

.post-header h1 {
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1.25rem;
}

.post-header .post-lede {
  font-size: 1.1rem;
  color: var(--mid);
  line-height: 1.7;
}

.post-body {
  max-width: 680px;
  padding-bottom: 6rem;
}

.post-body p {
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
  color: var(--black);
}

.post-body h2 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 3rem 0 1rem;
  color: var(--black);
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.post-body h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 2rem 0 0.75rem;
  color: var(--black);
}

.post-body strong {
  font-weight: 700;
  color: var(--black);
}

.post-body em { font-style: italic; }

.post-body a {
  color: var(--black);
  border-bottom: 1px solid var(--black);
  padding-bottom: 1px;
  transition: opacity 0.15s;
}

.post-body a:hover { opacity: 0.5; }

.post-body ul, .post-body ol {
  margin: 0 0 1.5rem 1.5rem;
}

.post-body li {
  font-size: 1.05rem;
  line-height: 1.75;
  margin-bottom: 0.5rem;
}

.post-body blockquote {
  border-left: 3px solid var(--black);
  padding: 0.75rem 0 0.75rem 1.5rem;
  margin: 2rem 0;
}

.post-body blockquote p {
  font-size: 1.15rem;
  font-style: italic;
  color: var(--black);
  margin: 0;
}

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--light);
  padding: 0.15em 0.4em;
}

.post-body pre {
  background: var(--black);
  color: var(--light);
  padding: 1.5rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

.post-body pre code {
  background: none;
  padding: 0;
  color: inherit;
}

/* Callout box */
.callout {
  border: 1px solid var(--black);
  padding: 1.5rem 2rem;
  margin: 2.5rem 0;
  background: var(--light);
}

.callout strong {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

/* ============================================
   COLLABORATE PAGE
   ============================================ */

.collaborate-hero {
  padding: 7rem 0 5rem;
  border-bottom: 1px solid var(--border);
  max-width: 720px;
}

.collaborate-hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.collaborate-hero p {
  font-size: 1.1rem;
  color: var(--mid);
  line-height: 1.75;
  margin-bottom: 1rem;
}

.collaborate-options {
  padding: 4rem 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-bottom: 4rem;
}

.collaborate-option {
  background: var(--white);
  padding: 2.5rem;
}

.collaborate-option .num {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--mid);
  margin-bottom: 1rem;
}

.collaborate-option h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.collaborate-option p {
  font-size: 0.88rem;
  color: var(--mid);
  line-height: 1.65;
}

.email-cta {
  padding: 3rem 0 6rem;
}

.email-cta p {
  font-size: 0.85rem;
  color: var(--mid);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}

.email-cta a {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--black);
  border-bottom: 2px solid var(--black);
  padding-bottom: 2px;
  transition: opacity 0.15s;
}

.email-cta a:hover { opacity: 0.45; }

/* ============================================
   POST ROW (homepage recent posts)
   ============================================ */

.post-row {
  display: flex;
  align-items: baseline;
  gap: 2rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
  transition: opacity 0.15s;
}

.post-row:hover { opacity: 0.55; }

.post-row-date {
  font-size: 0.75rem;
  color: var(--mid);
  min-width: 100px;
  letter-spacing: 0.03em;
}

.post-row-section {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--white);
  background: var(--black);
  padding: 0.2rem 0.45rem;
  min-width: 80px;
  text-align: center;
}

.post-row-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--black);
  flex: 1;
}

/* ============================================
   FOOTER
   ============================================ */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  background: var(--white);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-inner p {
  font-size: 0.75rem;
  color: var(--mid);
  letter-spacing: 0.03em;
}

.footer-email {
  font-size: 0.75rem;
  color: var(--mid);
  border-bottom: 1px solid var(--border);
  padding-bottom: 1px;
  transition: color 0.15s, border-color 0.15s;
}

.footer-email:hover {
  color: var(--black);
  border-color: var(--black);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
  .nav-links { gap: 1.25rem; }
  .nav-links a { font-size: 0.72rem; }

  .duality-grid { grid-template-columns: 1fr; }
  .duality-col:first-child {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .post-grid { grid-template-columns: 1fr; }
  .collaborate-options { grid-template-columns: 1fr; }

  .post-row { flex-wrap: wrap; gap: 0.5rem; }
  .post-row-date { min-width: auto; }
}

@media (max-width: 520px) {
  .nav-logo { display: none; }
  .nav-links { gap: 1rem; }
}