:root { color-scheme: dark; }

* { box-sizing: border-box; }

html { scroll-behavior: smooth; background: #050806; }

body {
  margin: 0;
  overflow-x: hidden;
  background: #050806;
  color: #fff;
  font-family: system-ui, -apple-system, "Microsoft YaHei", sans-serif;
}

.project-nav {
  position: fixed;
  z-index: 10;
  top: 22px;
  left: 24px;
  display: flex;
  gap: 8px;
}

.project-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid rgba(255, 255, 255, .82);
  color: #fff;
  background: rgba(5, 8, 6, .72);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .06em;
  text-decoration: none;
  transition: transform .2s ease, background .2s ease;
}

.project-nav a:hover,
.project-nav a:focus-visible,
.project-nav a[aria-current="page"] {
  outline: 0;
  background: #142719;
  transform: translateY(-2px);
}

.project-gallery {
  width: 100%;
  background: #050806;
}

.project-gallery img {
  display: block;
  width: 100%;
  height: auto;
}

.material-page {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: clamp(58px, 7vw, 124px) clamp(30px, 7vw, 140px);
  background: #142719;
}

.material-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  align-items: center;
  gap: clamp(14px, 1.8vw, 34px);
  width: min(100%, 1900px);
}

.material-grid img {
  display: block;
  width: 100%;
  max-height: 72vh;
  object-fit: contain;
  background: #142719;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 900px) {
  .project-nav { top: 14px; left: 14px; gap: 5px; }
  .project-nav a { min-height: 36px; padding: 0 10px; font-size: 12px; }
  .material-page { padding: 74px 18px 28px; }
  .material-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .project-nav a { transition: none; }
}