:root {
  --bg: #ffffff;
  --text: #1d1d1f;
  --text-muted: #6e6e73;
  --border: #e5e5e7;
  --max-width: 1100px;
  font-size: 16px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

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

.nav__logo {
  font-weight: 700;
  font-size: 1.1rem;
}

/* Header */
.project-header {
  max-width: 780px;
  margin: 0 auto;
  padding: 5rem 1.5rem 3.5rem;
  text-align: center;
}

.project-header__eyebrow {
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.8rem;
  margin-bottom: 1rem;
}

.project-header__title {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.project-header__text {
  margin-top: 1.5rem;
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.project-header__tags {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: 1.75rem;
}

.project-header__tags span {
  background: #f5f5f7;
  color: var(--text);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
}

/* Gallery bento grid */
.project-gallery {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 6rem;
}

.bento {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 220px;
  gap: 1.25rem;
}

.bento__item {
  border-radius: 20px;
  background-size: cover;
  background-position: center;
  background-color: #f5f5f7;
}

.bento__item--1 { grid-column: span 4; grid-row: span 2; }
.bento__item--2 { grid-column: span 2; grid-row: span 1; }
.bento__item--3 { grid-column: span 2; grid-row: span 1; }
.bento__item--4 { grid-column: span 2; grid-row: span 2; }
.bento__item--5 { grid-column: span 1; grid-row: span 1; }
.bento__item--6 { grid-column: span 1; grid-row: span 1; }

@media (max-width: 800px) {
  .bento { grid-template-columns: repeat(2, 1fr); grid-auto-rows: 180px; }
  .bento__item--1 { grid-column: span 2; grid-row: span 2; }
  .bento__item--2 { grid-column: span 1; grid-row: span 1; }
  .bento__item--3 { grid-column: span 1; grid-row: span 1; }
  .bento__item--4 { grid-column: span 2; grid-row: span 1; }
  .bento__item--5 { grid-column: span 1; grid-row: span 1; }
  .bento__item--6 { grid-column: span 1; grid-row: span 1; }
}

/* Project nav (prev/next) */
.project-footer-nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 6rem;
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--border);
  padding-top: 2.5rem;
}

.project-footer-nav a {
  font-weight: 600;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.project-footer-nav a:hover { color: var(--text); }

/* Footer */
.footer {
  text-align: center;
  padding: 2rem 1.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}