/* 09-photo-gallery — Photography portfolio */
:root {
  --white: #FFFFFF;
  --black: #0A0A0A;
  --gray: #6B7280;
  --gray-light: #F3F4F6;
  --font-display: "Archivo", sans-serif;
  --font-body: "Space Grotesk", sans-serif;
  --max-width: 1400px;
  --transition: 0.35s ease;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--black);
  background: var(--white);
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: opacity var(--transition);
}

a:hover, a:focus-visible { opacity: 0.6; }

a:focus-visible {
  outline: 2px solid var(--black);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--black);
  color: var(--white);
  padding: 0.5rem 1rem;
  z-index: 100;
}

.skip-link:focus { top: 1rem; }

/* Header */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
}

.site-header.light {
  position: relative;
  background: var(--white);
  border-bottom: 1px solid var(--gray-light);
}

.site-header.light a { color: var(--black); }

.site-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin: 0;
}

.site-title a { color: var(--white); }

.site-header.light .site-title a { color: var(--black); }

.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 2rem;
}

.main-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--white);
}

.site-header.light .main-nav a { color: var(--black); }

.main-nav a[aria-current="page"] {
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* Hero */
.hero {
  position: relative;
  height: 100vh;
  min-height: 500px;
  display: flex;
  align-items: flex-end;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 30%, #0f3460 60%, #533483 100%);
}

.hero-content {
  padding: 3rem 2rem;
  color: var(--white);
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 700;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.hero p {
  font-size: 1.125rem;
  opacity: 0.85;
  margin: 0;
  max-width: 480px;
}

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

main { padding: 4rem 0; }

.page-header {
  margin-bottom: 3rem;
}

.page-header h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.page-header p {
  color: var(--gray);
  margin: 0;
}

/* Filter */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.filter-btn {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.5rem 1.25rem;
  border: 1px solid var(--black);
  background: transparent;
  color: var(--black);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover,
.filter-btn:focus-visible {
  background: var(--black);
  color: var(--white);
}

.filter-btn:focus-visible {
  outline: 2px solid var(--black);
  outline-offset: 2px;
}

.filter-btn.active {
  background: var(--black);
  color: var(--white);
}

/* Masonry gallery */
.gallery {
  columns: 1;
  column-gap: 1rem;
}

@media (min-width: 540px) { .gallery { columns: 2; } }
@media (min-width: 900px) { .gallery { columns: 3; } }

.gallery-item {
  break-inside: avoid;
  margin-bottom: 1rem;
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.gallery-item.hidden { display: none; }

.photo-placeholder {
  width: 100%;
  background: var(--gray-light);
  position: relative;
}

.photo-placeholder.tall { aspect-ratio: 3/4; }
.photo-placeholder.wide { aspect-ratio: 4/3; }
.photo-placeholder.square { aspect-ratio: 1/1; }

.photo-placeholder::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    145deg,
    hsl(var(--hue, 200), 15%, 75%) 0%,
    hsl(var(--hue, 200), 20%, 55%) 100%
  );
}

.overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.5rem;
  color: var(--white);
  opacity: 0;
  transition: opacity var(--transition);
}

.gallery-item:hover .overlay,
.gallery-item:focus-within .overlay {
  opacity: 1;
}

.overlay h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.25rem;
}

.overlay p {
  font-size: 0.8125rem;
  margin: 0;
  opacity: 0.8;
}

/* About page */
.about-layout {
  display: grid;
  gap: 3rem;
}

@media (min-width: 768px) {
  .about-layout {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

.bio-photo {
  aspect-ratio: 4/5;
  background: linear-gradient(180deg, #374151 0%, #111827 100%);
}

.bio-content h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2rem 0 1rem;
}

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

.bio-content p {
  margin: 0 0 1rem;
  color: var(--gray);
}

.gear-list, .exhibition-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.gear-list li, .exhibition-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--gray-light);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.9375rem;
}

.gear-list li:last-child,
.exhibition-list li:last-child { border-bottom: none; }

.gear-list .item-name { font-weight: 500; }
.gear-list .item-spec { color: var(--gray); }

.exhibition-list .year {
  font-family: var(--font-display);
  font-weight: 600;
  min-width: 3rem;
}

/* Footer */
.site-footer {
  padding: 2rem;
  border-top: 1px solid var(--gray-light);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--gray);
}

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

.footer-nav a { color: var(--gray); }

@media (max-width: 640px) {
  .site-header { padding: 1rem; }
  .main-nav ul { gap: 1rem; }
  .main-nav a { font-size: 0.75rem; }
  .container { padding: 0 1rem; }
}