/* ============================================
   Design System
   ============================================ */

:root {
  /* Colors */
  --color-bg: #FAFAF8;
  --color-surface: #F3F2EF;
  --color-text: #1A1A18;
  --color-text-secondary: #6B6B66;
  --color-text-tertiary: #9B9B96;
  --color-border: #E5E4E0;
  --color-blue: #0032BF;
  --color-blue-hover: #0028a0;
  --color-blue-light: #006CFA;

  /* Typography */
  --font-serif: 'Instrument Serif', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 9rem;

  /* Layout */
  --container-max: 1120px;
  --container-padding: 2rem;

  /* Transitions */
  --ease-out: cubic-bezier(0.25, 0.1, 0.25, 1);
  --duration-fast: 0.25s;
  --duration-med: 0.28s;
  --duration-slow: 0.7s;
}

/* ============================================
   Reset & Base
   ============================================ */

*, *::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-sans);
  font-weight: 400;
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* ============================================
   Utilities
   ============================================ */

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

.section-label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-xl);
}

/* ============================================
   Scroll Reveal
   ============================================ */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease-out),
              transform 0.8s var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 {
  transition-delay: 0.15s;
}

.reveal-delay-2 {
  transition-delay: 0.3s;
}

/* ============================================
   Button Components
   ============================================ */

.btn-arrow {
  display: inline-block;
  max-width: 0;
  overflow: hidden;
  opacity: 0;
  padding-left: 0;
  transform: translateX(-4px);
  transition: max-width var(--duration-med) var(--ease-out),
              opacity var(--duration-med) ease,
              padding-left var(--duration-med) var(--ease-out),
              transform var(--duration-med) var(--ease-out);
  white-space: nowrap;
  vertical-align: middle;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.65rem 1.5rem;
  background-color: var(--color-blue);
  color: #fff;
  border-radius: 0;
  transition: background-color var(--duration-fast) ease,
              transform var(--duration-fast) ease;
  text-decoration: none;
}

.btn-primary:hover {
  background-color: var(--color-blue-hover);
  transform: translateY(-1px);
}

.btn-primary:hover .btn-arrow {
  max-width: 3em;
  opacity: 1;
  padding-left: 1.5rem;
  transform: translateX(0);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-blue);
  text-decoration: none;
  transition: color var(--duration-fast) ease;
}

.btn-secondary--muted {
  color: var(--color-text-secondary);
}

.btn-secondary:hover {
  color: var(--color-blue-hover);
}

.btn-secondary:hover .btn-arrow {
  max-width: 3em;
  opacity: 1;
  padding-left: 1.5rem;
  transform: translateX(0);
}

/* ============================================
   Navigation
   ============================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: rgba(250, 250, 248, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

.nav.scrolled {
  border-bottom-color: var(--color-border);
}

.nav-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
}

.nav-logo-img {
  height: 39px;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-label-short {
  display: none !important;
}

/* Let .btn-secondary own its own color — no generic nav link color override */

.nav-links .btn-secondary--muted {
  color: var(--color-text-secondary);
}

.nav-links .btn-secondary--muted:hover {
  color: var(--color-blue-hover);
}

.nav-links .btn-secondary:not(.btn-secondary--muted) {
  color: var(--color-blue);
}

/* ============================================
   Hero
   ============================================ */

.hero {
  padding-top: calc(64px + var(--space-3xl));
  padding-bottom: var(--space-3xl);
}

.hero-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: grid;
  grid-template-columns: 1fr 0.55fr;
  gap: var(--space-xl);
  align-items: center;
}

.hero-greeting {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-blue-light);
  margin-bottom: var(--space-xl);
}

.hero-heading {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(2rem, 3.8vw, 3.25rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.hero-sub {
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  max-width: 480px;
}

.hero-status {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-lg);
  padding-left: var(--space-sm);
  border-left: 2px solid var(--color-border);
  line-height: 1.55;
  max-width: 420px;
}

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

/* Portrait */

.portrait-frame {
  position: relative;
  aspect-ratio: 7 / 8.5;
  overflow: hidden;
  border-radius: 2px;
  background-color: var(--color-surface);
}

.portrait-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(15%) contrast(1.02);
  transition: transform 0.6s var(--ease-out),
              filter 0.6s ease;
}

.hero-portrait:hover .portrait-img {
  transform: scale(1.02);
  filter: grayscale(0%) contrast(1.02);
}

/* ============================================
   Featured Project
   ============================================ */

.featured {
  padding: var(--space-3xl) 0;
  border-top: 1px solid var(--color-border);
}

.featured-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.featured-image {
  position: relative;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border-radius: 2px;
  background-color: var(--color-surface);
}

.featured-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out);
}

.featured-card:hover .featured-image img {
  transform: scale(1.025);
}

.featured-info {
  max-width: 100%;
}

.featured-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.meta-sep {
  width: 16px;
  height: 1px;
  background-color: var(--color-border);
}

.case-study-logo {
  height: 28px;
  width: auto;
  object-fit: contain;
  object-position: left center;
  margin-bottom: var(--space-sm);
  opacity: 0.85;
}

.featured-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin-bottom: var(--space-sm);
}

.featured-desc {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.featured-card .btn-secondary:hover .btn-arrow {
  max-width: 3em;
  opacity: 1;
  padding-left: 1.5rem;
  transform: translateX(0);
}

/* ============================================
   More Work
   ============================================ */

.more-work {
  padding: 0 0 var(--space-3xl) 0;
}

.work-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background-color: var(--color-border);
  border: 1px solid var(--color-border);
}

.work-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background-color: var(--color-bg);
  transition: background-color 0.3s ease;
}

.work-card:hover {
  background-color: rgba(0, 0, 0, 0.015);
}

.work-card-inner {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  aspect-ratio: 1 / 1;
}

.work-card-meta {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-md);
}

.work-card-logo {
  height: 44px;
  width: auto;
  object-fit: contain;
  object-position: left center;
  margin-bottom: var(--space-sm);
  opacity: 0.85;
}

.work-card-desc {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  flex: 1;
}

.work-card-arrow {
  font-size: 1.125rem;
  color: var(--color-blue);
  display: inline-block;
  align-self: flex-end;
  transition: transform 0.3s var(--ease-out);
}

.work-card:hover .work-card-arrow {
  transform: scale(1.25);
}

/* ============================================
   Writing / AI Experiments
   ============================================ */

.writing {
  padding: var(--space-3xl) 0;
  border-top: 1px solid var(--color-border);
}

.writing-list {
  display: flex;
  flex-direction: column;
}

.writing-item {
  display: block;
  border-top: 1px solid var(--color-border);
  transition: background-color 0.3s ease;
}

.writing-item:last-child {
  border-bottom: 1px solid var(--color-border);
}

.writing-item:hover {
  background-color: rgba(0, 0, 0, 0.015);
}

.writing-item-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) 2rem;
}

.writing-item-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin-bottom: 0.25rem;
  transition: color var(--duration-fast) ease;
}

.writing-item:hover .writing-item-title {
  color: var(--color-text);
}

.writing-item-meta {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  letter-spacing: 0.02em;
}

.writing-item-arrow {
  font-size: 1.125rem;
  color: var(--color-blue);
  transition: transform 0.3s var(--ease-out);
  flex-shrink: 0;
  margin-left: var(--space-lg);
  display: inline-block;
}

.writing-item:hover .writing-item-arrow {
  transform: scale(1.25);
}

/* ============================================
   Contact
   ============================================ */

.contact {
  padding: var(--space-3xl) 0;
  border-top: 1px solid var(--color-border);
}

.contact-inner {
  max-width: 560px;
}

.contact-heading {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin-bottom: var(--space-md);
}

.contact-body {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.contact-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

/* ============================================
   Footer
   ============================================ */

.footer {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
}

/* ============================================
   Responsive — Tablet
   ============================================ */

@media (max-width: 900px) {
  :root {
    --container-padding: 1.5rem;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .hero {
    padding-top: calc(64px + var(--space-xl));
    padding-bottom: var(--space-xl);
  }

  .hero-portrait {
    max-width: 320px;
  }

  .featured,
  .writing,
  .contact {
    padding: var(--space-2xl) 0;
  }

  .more-work {
    padding-bottom: var(--space-2xl);
  }

  .featured-card {
    grid-template-columns: 1fr;
  }

  .featured-image {
    max-height: 420px;
  }

  .work-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .work-card:last-child {
    grid-column: 1 / -1;
  }

  .work-card:last-child .work-card-inner {
    aspect-ratio: auto;
  }
}

/* ============================================
   Responsive — Mobile
   ============================================ */

@media (max-width: 600px) {
  :root {
    --container-padding: 1.25rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 5rem;
  }

  .hero-heading {
    font-size: 2.25rem;
  }

  .hero-sub {
    font-size: 1rem;
  }

  .hero-ctas {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .hero-portrait {
    max-width: 280px;
  }

  .nav-inner {
    padding: 0 var(--container-padding);
    height: 56px;
  }

  .nav-logo-img {
    height: 24px;
  }

  .nav-links {
    gap: 0.875rem;
  }

  .nav-links .btn-arrow {
    display: none;
  }

  .nav-links .btn-secondary {
    font-size: 0.75rem;
    white-space: nowrap;
  }

  .nav-label-full {
    display: none !important;
  }

  .nav-label-short {
    display: inline !important;
  }

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

  .work-card-inner {
    aspect-ratio: auto;
  }

  .work-card:last-child {
    grid-column: auto;
  }

  .writing-item-inner {
    padding: var(--space-lg) var(--space-sm);
  }

  .contact-links {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .section-label {
    margin-bottom: var(--space-lg);
  }
}