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

:root {
  --black: #2B2B2B;
  --white: #F3F1EE;
  --gray-100: #EAE8E4;
  --gray-300: #D5D3CE;
  --gray-500: #8A8A86;
  --gray-700: #4A4A48;
  --accent: #3240BB;
  --font: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', 'SF Mono', monospace;
  --ease: cubic-bezier(.22, 1, .36, 1);
}

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

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

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

::selection {
  background: var(--accent);
  color: #fff;
}

/* ── Layout ── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2.5rem;
}

section { padding: 6rem 0; }

/* ── Navigation ── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(243, 241, 238, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.4s var(--ease);
}

nav.scrolled { border-bottom-color: var(--gray-300); }

nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 5rem;
}

.logo {
  font-weight: 400;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 3rem;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.85rem;
  color: var(--gray-500);
  transition: color 0.3s var(--ease);
  letter-spacing: 0.01em;
}

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

.nav-socials {
  display: flex;
  gap: 1rem;
}

.nav-socials a {
  color: var(--gray-500);
  transition: color 0.3s var(--ease);
  display: flex;
  align-items: center;
}

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

.nav-socials a svg { display: block; }

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.menu-toggle span {
  display: block;
  width: 1.5rem;
  height: 1.5px;
  background: var(--black);
  margin: 5px 0;
  transition: all 0.3s var(--ease);
}

/* ── Hero ── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 8rem;
}

.hero-content {
  width: 100%;
  max-width: 820px;
}

.hero h1 {
  font-size: clamp(2.8rem, 5.5vw, 4.8rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin-bottom: 2rem;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--gray-500);
  max-width: 520px;
  line-height: 1.75;
}

/* ── Section Label ── */
.section-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--gray-500);
  margin-bottom: 3rem;
}

/* ── Work Section — Grid ── */
#work {
  padding-top: 2rem;
  padding-bottom: 6rem;
}

.work-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3.5rem;
}

.work-card {
  display: block;
  text-decoration: none;
  color: inherit;
  border-radius: 12px;
  overflow: hidden;
  transition: transform 0.5s var(--ease);
}

.work-card:hover {
  transform: translateY(-4px);
}

.work-card-thumb {
  width: 100%;
  aspect-ratio: 3 / 2;
  border-radius: 12px;
  overflow: hidden;
  position: relative;
  transition: box-shadow 0.5s var(--ease);
}

.work-card-thumb::after {
  content: 'Open';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: #fff;
  background: rgba(0, 0, 0, 0.3);
  opacity: 0;
  transition: opacity 0.4s var(--ease);
  border-radius: 12px;
  z-index: 1;
}

.work-card:hover .work-card-thumb::after {
  opacity: 1;
}

.work-card:hover .work-card-thumb {
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
}

.work-card-thumb img,
.work-card-thumb video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ease);
}

.work-card:hover .work-card-thumb img,
.work-card:hover .work-card-thumb video {
  transform: scale(1.05);
}

.work-card-title {
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-top: 1rem;
  line-height: 1.35;
}

/* Last card spans full width if odd count */
.work-grid .work-card:last-child:nth-child(odd) {
  grid-column: 1 / -1;
}

.work-grid .work-card:last-child:nth-child(odd) .work-card-thumb {
  aspect-ratio: 21 / 9;
}

/* ── About ── */
#about {
  background: var(--gray-100);
  padding: 7rem 0;
}

.about-layout {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 6rem;
  align-items: start;
}

.about-intro {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 300;
  line-height: 1.4;
  letter-spacing: -0.015em;
  margin-bottom: 2rem;
}

.about-body p {
  color: var(--gray-500);
  font-size: 0.95rem;
  line-height: 1.8;
}

.about-sidebar {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  padding-top: 0.25rem;
}

.about-group h3 {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--gray-500);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--gray-300);
}

.about-group ul li {
  font-size: 0.9rem;
  color: var(--gray-700);
  padding: 0.4rem 0;
}

/* ── Contact ── */
#contact {
  padding: 8rem 0;
}

.contact-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.contact-heading {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 300;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1.5rem;
}

.contact-text {
  color: var(--gray-500);
  font-size: 1.05rem;
  max-width: 440px;
  line-height: 1.75;
  margin-bottom: 3rem;
}

.contact-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.05rem;
  font-weight: 500;
  padding: 1.1rem 2.75rem;
  background: var(--accent);
  color: #fff;
  border-radius: 100px;
  transition: all 0.4s var(--ease);
  letter-spacing: -0.01em;
}

.contact-cta:hover {
  background: #2833a0;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(50, 64, 187, 0.25);
}

.contact-cta span {
  font-size: 1.1rem;
  transition: transform 0.3s var(--ease);
}

.contact-cta:hover span {
  transform: translateX(3px);
}

/* ── Footer ── */
footer {
  border-top: 1px solid var(--gray-300);
  padding: 2rem 0;
}

footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-copy {
  font-size: 0.78rem;
  color: var(--gray-500);
}

.footer-socials {
  display: flex;
  gap: 1.5rem;
}

.footer-socials a {
  font-size: 0.78rem;
  color: var(--gray-500);
  transition: color 0.3s var(--ease);
}

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

/* ── Back to Top ── */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: all 0.4s var(--ease);
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover { transform: translateY(-3px); }

/* ── Fade Animation ── */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.fade-in.visible {
  opacity: 1;
  transform: none;
}

/* stagger children */
.stagger .fade-in:nth-child(1) { transition-delay: 0s; }
.stagger .fade-in:nth-child(2) { transition-delay: 0.06s; }
.stagger .fade-in:nth-child(3) { transition-delay: 0.12s; }
.stagger .fade-in:nth-child(4) { transition-delay: 0.18s; }
.stagger .fade-in:nth-child(5) { transition-delay: 0.24s; }

/* ── Case Study Pages ── */
.case-hero {
  padding-top: 12rem;
  padding-bottom: 4rem;
}

.case-hero .section-label { margin-bottom: 1.5rem; }

.case-hero h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.5rem);
  font-weight: 300;
  letter-spacing: -0.01em;
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

.case-hero p {
  font-size: 1.1rem;
  color: var(--gray-500);
  max-width: 600px;
  line-height: 1.7;
}

.case-cover {
  width: 100%;
  aspect-ratio: 16 / 7;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 5rem;
}

.case-cover-inner {
  width: 100%;
  height: 100%;
}

.case-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  padding-bottom: 3.5rem;
  border-bottom: 1px solid var(--gray-300);
  margin-bottom: 4rem;
}

.case-meta dt {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--gray-500);
  margin-bottom: 0.5rem;
}

.case-meta dd {
  font-size: 0.95rem;
  font-weight: 500;
}

.case-content {
  max-width: 680px;
  margin: 0 auto;
  padding-bottom: 2rem;
}

.case-content h2 {
  font-size: 1.4rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: 3.5rem 0 1rem;
}

.case-content h2:first-child { margin-top: 0; }

.case-content p {
  color: var(--gray-500);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.case-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  color: var(--accent);
  font-weight: 500;
  font-size: 1rem;
  text-decoration: none;
  transition: gap 0.3s var(--ease);
}

.case-cta:hover {
  gap: 0.75rem;
}

.case-image {
  width: 100vw;
  margin-left: calc(-50vw + 50%);
  padding: 3rem 0;
}

.case-image-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2.5rem;
}

.case-image-inner .placeholder-img {
  border-radius: 12px;
  aspect-ratio: 16 / 9;
}

.case-nav {
  border-top: 1px solid var(--gray-300);
  margin-top: 4rem;
  padding: 2.5rem 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.case-nav a {
  font-size: 0.85rem;
  color: var(--gray-500);
  transition: color 0.3s var(--ease);
}

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

.case-nav .next-project { text-align: right; }

.case-nav .next-project span {
  display: block;
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--black);
  margin-top: 0.25rem;
}

/* Placeholder images */
.placeholder-img {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: rgba(0,0,0,0.2);
  letter-spacing: 0.05em;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .container { padding: 0 1.5rem; }
  section { padding: 4.5rem 0; }

  .nav-right { gap: 1.5rem; }

  .nav-links {
    display: flex;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100vh;
    background: var(--black);
    flex-direction: column;
    justify-content: center;
    padding: 2rem 1.5rem;
    gap: 1.5rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s var(--ease);
    z-index: 998;
  }

  nav.menu-open {
    background: transparent;
    border-bottom-color: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .nav-links a {
    font-size: 2rem;
    color: var(--white);
  }
  .nav-links a:hover { color: var(--gray-300); }

  .nav-links.open {
    opacity: 1;
    pointer-events: auto;
  }

  .nav-socials { display: none; }
  .menu-toggle {
    display: block;
    position: relative;
    z-index: 999;
  }

  nav.menu-open .logo {
    color: var(--white);
    position: relative;
    z-index: 999;
  }

  .menu-toggle.open span {
    background: var(--white);
  }
  .menu-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(4.5px, 4.5px);
  }
  .menu-toggle.open span:nth-child(2) { opacity: 0; }
  .menu-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(4.5px, -4.5px);
  }

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

  .work-grid .work-card:last-child:nth-child(odd) .work-card-thumb {
    aspect-ratio: 3 / 2;
  }

  .about-layout {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  #about { padding: 5rem 0; }

  .case-meta {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .case-nav {
    flex-direction: column;
    gap: 1.5rem;
    text-align: center;
  }

  .case-nav .next-project { text-align: center; }

  footer .container {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}