/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root {
  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.2vw, 0.8125rem);
  --text-sm: clamp(0.8125rem, 0.78rem + 0.25vw, 0.9375rem);
  --text-base: clamp(0.9375rem, 0.9rem + 0.25vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1rem + 0.6vw, 1.375rem);
  --text-xl: clamp(1.375rem, 1.1rem + 1.1vw, 2rem);
  --text-2xl: clamp(1.75rem, 1.1rem + 2.4vw, 3.25rem);
  --text-hero: clamp(2.25rem, 1rem + 4vw, 4.5rem);

  /* Spacing (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  --font-display: 'Instrument Serif', 'Iowan Old Style', Georgia, serif;
  --font-body: 'Switzer', 'General Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --radius: 2px;
}

/* Dark (default) — moody, gallery-wall black */
:root,
[data-theme='dark'] {
  --color-bg: #0c0b09;
  --color-surface: #131210;
  --color-surface-2: #191815;
  --color-border: #2a2823;
  --color-text: #f2efe9;
  --color-text-muted: #a6a196;
  --color-text-faint: #6b675e;
  --color-accent: #c9a15a;
  --color-accent-soft: rgba(201, 161, 90, 0.14);
  --scrim: rgba(6, 5, 4, 0.86);
}

[data-theme='light'] {
  --color-bg: #f7f5f0;
  --color-surface: #ffffff;
  --color-surface-2: #efece4;
  --color-border: #ddd8cc;
  --color-text: #201e19;
  --color-text-muted: #6b6559;
  --color-text-faint: #a19b8c;
  --color-accent: #93672c;
  --color-accent-soft: rgba(147, 103, 44, 0.12);
  --scrim: rgba(20, 18, 15, 0.92);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.4s var(--ease-out), color 0.4s var(--ease-out);
}

img { max-width: 100%; display: block; }
a { color: inherit; }

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

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) clamp(var(--space-4), 4vw, var(--space-12));
  background: color-mix(in srgb, var(--color-bg) 78%, transparent);
  backdrop-filter: blur(14px) saturate(1.1);
  -webkit-backdrop-filter: blur(14px) saturate(1.1);
  border-bottom: 1px solid var(--color-border);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.brand-mark {
  width: 30px;
  height: 30px;
  color: var(--color-accent);
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  letter-spacing: 0.01em;
  font-style: italic;
}

.brand-sub {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition: border-color 0.25s var(--ease-out), background-color 0.25s var(--ease-out);
}
.icon-btn:hover { border-color: var(--color-accent); background: var(--color-accent-soft); }
.icon-btn svg { width: 17px; height: 17px; }

/* ============================================================
   INTRO
   ============================================================ */
.intro {
  padding: clamp(var(--space-10), 8vw, var(--space-20)) clamp(var(--space-4), 4vw, var(--space-12)) clamp(var(--space-6), 4vw, var(--space-10));
  max-width: 780px;
}

.intro-eyebrow {
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 var(--space-4);
}

.intro-heading {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: var(--text-hero);
  line-height: 1.02;
  margin: 0 0 var(--space-5);
  color: var(--color-text);
}

.intro-body {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 46ch;
  margin: 0;
}

/* ============================================================
   MASONRY GRID
   ============================================================ */
.gallery {
  padding: 0 clamp(var(--space-3), 3vw, var(--space-10)) clamp(var(--space-16), 8vw, var(--space-24));
  columns: 4 260px;
  column-gap: var(--space-4);
}

@media (max-width: 1100px) {
  .gallery { columns: 3 220px; }
}
@media (max-width: 720px) {
  .gallery { columns: 2 160px; column-gap: var(--space-3); }
}
@media (max-width: 460px) {
  .gallery { columns: 1; }
}

.tile {
  position: relative;
  margin: 0 0 var(--space-4);
  break-inside: avoid;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-surface-2);
  cursor: zoom-in;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

.tile.in-view {
  opacity: 1;
  transform: translateY(0);
}

.tile img {
  width: 100%;
  height: auto;
  transition: transform 0.6s var(--ease-out), filter 0.6s var(--ease-out);
  filter: grayscale(0.02);
}

.tile:hover img {
  transform: scale(1.035);
}

.tile-veil {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-end;
  padding: var(--space-4);
  background: linear-gradient(to top, rgba(0,0,0,0.55) 0%, rgba(0,0,0,0) 45%);
  opacity: 0;
  transition: opacity 0.35s var(--ease-out);
}
.tile:hover .tile-veil,
.tile:focus-visible .tile-veil { opacity: 1; }

.tile-caption {
  color: #f2efe9;
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-base);
  text-shadow: 0 1px 6px rgba(0,0,0,0.4);
}

.tile-index {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  font-size: var(--text-xs);
  color: #f2efe9;
  background: rgba(0,0,0,0.35);
  padding: 3px 8px;
  border-radius: 20px;
  letter-spacing: 0.04em;
  opacity: 0;
  transition: opacity 0.3s var(--ease-out);
}
.tile:hover .tile-index { opacity: 1; }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  padding: var(--space-10) clamp(var(--space-4), 4vw, var(--space-12)) var(--space-16);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
  justify-content: space-between;
  color: var(--color-text-faint);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}

/* ============================================================
   LIGHTBOX
   ============================================================ */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--scrim);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s var(--ease-out);
}
.lightbox.open {
  opacity: 1;
  pointer-events: auto;
}

.lightbox-figure {
  position: relative;
  max-width: min(92vw, 1500px);
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.lightbox-img-wrap {
  max-width: 92vw;
  max-height: 78vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-img {
  max-width: 92vw;
  max-height: 78vh;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 2px;
  box-shadow: 0 30px 80px rgba(0,0,0,0.5);
  opacity: 0;
  transform: scale(0.98);
  transition: opacity 0.4s var(--ease-out), transform 0.4s var(--ease-out);
}
.lightbox-img.loaded { opacity: 1; transform: scale(1); }

.lightbox-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: #f2efe9;
}

.lightbox-caption {
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-lg);
}

.lightbox-count {
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: rgba(242,239,233,0.6);
}

.lightbox-close,
.lightbox-nav {
  position: fixed;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid rgba(242,239,233,0.25);
  background: rgba(20,18,15,0.5);
  color: #f2efe9;
  cursor: pointer;
  transition: border-color 0.25s var(--ease-out), background-color 0.25s var(--ease-out);
}
.lightbox-close:hover,
.lightbox-nav:hover { border-color: var(--color-accent); background: rgba(20,18,15,0.8); }

.lightbox-close { top: var(--space-6); right: var(--space-6); }
.lightbox-nav svg, .lightbox-close svg { width: 18px; height: 18px; }
.lightbox-prev { left: var(--space-4); top: 50%; transform: translateY(-50%); }
.lightbox-next { right: var(--space-4); top: 50%; transform: translateY(-50%); }

@media (max-width: 640px) {
  .lightbox-prev, .lightbox-next { width: 38px; height: 38px; }
  .lightbox-close { width: 38px; height: 38px; top: var(--space-4); right: var(--space-4); }
}

/* ============================================================
   MOTION SAFETY
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  .tile, .tile img, .lightbox, .lightbox-img { transition: none !important; }
}