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

:root {
  --font: 'DM Sans', system-ui, sans-serif;
  --black: #0a0a0a;
  --white: #ffffff;
  --mid: #888;
  --gap: 8px;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font);
  background: var(--white);
  color: var(--black);
  min-height: 100dvh;
}

/* ─────────────────────────────────────────
   Navigation
───────────────────────────────────────── */
nav {
  display: flex;
  align-items: baseline;
  gap: 28px;
  padding: 22px 40px;
}

.logo {
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--black);
}

.year-nav {
  display: flex;
  gap: 20px;
}

.year-nav a {
  text-decoration: none;
  color: var(--black);
  font-size: 1rem;
  font-weight: 500;
  opacity: 0.35;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: opacity 0.2s, border-color 0.2s;
}

.year-nav a:hover {
  opacity: 0.65;
}

.year-nav a.active {
  opacity: 1;
  border-bottom-color: var(--black);
}

/* ─────────────────────────────────────────
   Header
───────────────────────────────────────── */
header {
  max-width: 820px;
  margin: 0 auto;
  padding: 52px 24px 72px;
  text-align: center;
}

.message {
  font-size: clamp(1.75rem, 4.5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin-bottom: 28px;
}

.signature {
  font-size: clamp(1.3rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}

/* ─────────────────────────────────────────
   Gallery — CSS masonry columns
───────────────────────────────────────── */
.gallery {
  padding: 0 var(--gap) 80px;
  columns: 4 200px;   /* up to 4 columns, min 200px each */
  column-gap: var(--gap);
}

.gallery-loading {
  column-span: all;
  text-align: center;
  color: var(--mid);
  font-size: 0.9rem;
  padding: 48px 0;
  letter-spacing: 0.05em;
  text-transform: lowercase;
}

.gallery-empty {
  column-span: all;
  text-align: center;
  color: var(--mid);
  font-size: 0.9rem;
  padding: 80px 24px;
}

.gallery-item {
  break-inside: avoid;
  margin-bottom: var(--gap);
  cursor: pointer;
  overflow: hidden;
  background: #f0f0f0; /* placeholder while loading */
}

.gallery-item img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.35s ease, opacity 0.3s ease;
  opacity: 0;
}

.gallery-item img.loaded {
  opacity: 1;
}

.gallery-item:hover img {
  transform: scale(1.03);
}

/* ─────────────────────────────────────────
   Lightbox
───────────────────────────────────────── */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.93);
  z-index: 9999;
  align-items: center;
  justify-content: center;
}

.lightbox.open {
  display: flex;
}

.lb-img-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  padding: 60px 80px;
}

.lb-img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  user-select: none;
  -webkit-user-select: none;
  border-radius: 2px;
}

/* Lightbox buttons */
.lb-close,
.lb-prev,
.lb-next {
  position: absolute;
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.75);
  cursor: pointer;
  transition: color 0.15s;
  line-height: 1;
}

.lb-close:hover,
.lb-prev:hover,
.lb-next:hover {
  color: #fff;
}

.lb-close {
  top: 18px;
  right: 22px;
  font-size: 2.5rem;
  font-weight: 300;
}

.lb-prev,
.lb-next {
  top: 50%;
  transform: translateY(-50%);
  font-size: 4rem;
  font-weight: 200;
  padding: 20px;
}

.lb-prev { left: 4px; }
.lb-next { right: 4px; }

.lb-counter {
  position: absolute;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  font-family: var(--font);
}

/* ─────────────────────────────────────────
   Responsive
───────────────────────────────────────── */
@media (max-width: 640px) {
  nav {
    padding: 16px 20px;
    gap: 16px;
    flex-wrap: wrap;
  }

  .year-nav {
    gap: 14px;
  }

  .year-nav a {
    font-size: 0.9rem;
  }

  header {
    padding: 36px 20px 52px;
  }

  .gallery {
    columns: 2;
  }

  .lb-img-wrap {
    padding: 48px 12px;
  }

  .lb-prev,
  .lb-next {
    font-size: 2.5rem;
    padding: 10px;
  }

  .lb-prev { left: 0; }
  .lb-next { right: 0; }
}