/* =========================================================
   Travel Photography Website – Style Sheet
   Mobile-first, responsive, supports light + dark mode
   ========================================================= */

/* ---------------------------------------------------------
   Custom properties / Design tokens
   --------------------------------------------------------- */
:root {
  /* Palette */
  --clr-bg:          #faf9f7;
  --clr-surface:     #ffffff;
  --clr-surface-2:   #f3f1ee;
  --clr-border:      #e5e2dd;
  --clr-text:        #1a1a18;
  --clr-text-muted:  #6b6860;
  --clr-accent:      #8b6f4e;
  --clr-accent-dark: #6b5239;
  --clr-overlay:     rgba(0, 0, 0, 0.88);

  /* Typography */
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans:  'Inter', system-ui, -apple-system, sans-serif;

  /* Spacing */
  --space-xs:   0.375rem;
  --space-sm:   0.75rem;
  --space-md:   1.25rem;
  --space-lg:   2rem;
  --space-xl:   3.5rem;

  /* Radius */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;

  /* Shadow */
  --shadow-sm:  0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md:  0 4px 12px rgba(0,0,0,.10), 0 2px 4px rgba(0,0,0,.06);
  --shadow-lg:  0 10px 30px rgba(0,0,0,.14), 0 4px 8px rgba(0,0,0,.08);

  /* Transitions */
  --transition: 200ms ease;

  /* Layout */
  --max-width: 1400px;
  --header-h:  64px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --clr-bg:          #111110;
    --clr-surface:     #1c1c1a;
    --clr-surface-2:   #242422;
    --clr-border:      #2e2e2b;
    --clr-text:        #f0ede8;
    --clr-text-muted:  #9a9690;
    --clr-accent:      #c4985c;
    --clr-accent-dark: #dab47a;
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.65;
  color: var(--clr-text);
  background: var(--clr-bg);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

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

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

/* ---------------------------------------------------------
   Layout helpers
   --------------------------------------------------------- */
main {
  flex: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md);
}

@media (min-width: 640px)  { main { padding: var(--space-lg) var(--space-lg); } }
@media (min-width: 1024px) { main { padding: var(--space-xl) var(--space-lg); } }

/* ---------------------------------------------------------
   Site header
   --------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  padding: 0 var(--space-md);
  background: var(--clr-bg);
  border-bottom: 1px solid var(--clr-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  background: color-mix(in srgb, var(--clr-bg) 92%, transparent);
}

.site-title {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--clr-text);
  transition: color var(--transition);
}

.site-title:hover { color: var(--clr-accent); }

/* ---------------------------------------------------------
   Breadcrumbs
   --------------------------------------------------------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  align-items: center;
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  margin-bottom: var(--space-lg);
}

.breadcrumbs a {
  color: var(--clr-accent);
  transition: color var(--transition);
}

.breadcrumbs a:hover { color: var(--clr-accent-dark); text-decoration: underline; }
.breadcrumbs .sep    { color: var(--clr-border); user-select: none; }
.breadcrumbs [aria-current="page"] { color: var(--clr-text-muted); }

/* ---------------------------------------------------------
   Page header
   --------------------------------------------------------- */
.page-header {
  margin-bottom: var(--space-xl);
}

.page-header h1 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--clr-text);
}

.page-description {
  margin-top: var(--space-md);
  font-size: clamp(1rem, 2vw, 1.15rem);
  font-weight: 300;
  color: var(--clr-text-muted);
  max-width: 65ch;
  line-height: 1.7;
}

/* ---------------------------------------------------------
   Folder / Category grid
   --------------------------------------------------------- */
.folder-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .folder-grid { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
}

.folder-card {
  display: flex;
  flex-direction: column;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
}

.folder-card:hover,
.folder-card:focus-visible {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  outline: 2px solid var(--clr-accent);
  outline-offset: 2px;
}

/* Cover image */
.folder-cover {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  background: var(--clr-surface-2);
}

.folder-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 400ms ease;
}

.folder-card:hover .folder-cover img { transform: scale(1.04); }

.folder-cover-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
}

/* Folder info */
.folder-info {
  padding: var(--space-md);
  flex: 1;
}

.folder-info h2 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.3;
}

.folder-desc {
  margin-top: var(--space-xs);
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---------------------------------------------------------
   Photo grid (album / leaf page)
   --------------------------------------------------------- */
.photo-grid {
  --cols: 1;
  display: grid;
  grid-template-columns: repeat(var(--cols), 1fr);
  gap: var(--space-sm);
}

@media (min-width: 480px)  { .photo-grid { --cols: 2; } }
@media (min-width: 768px)  { .photo-grid { --cols: 3; } }
@media (min-width: 1100px) { .photo-grid { --cols: 4; } }

.photo-item {
  position: relative;
  background: var(--clr-surface-2);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 3 / 2;
}

.photo-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 400ms ease, opacity var(--transition);
  opacity: 0;          /* start invisible; JS reveals after load */
}

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

.photo-item:hover img,
.photo-item:focus-visible img { transform: scale(1.03); }

.photo-item:focus-visible {
  outline: 2px solid var(--clr-accent);
  outline-offset: 2px;
}

/* Caption overlay – visible on hover / focus */
.photo-item figcaption {
  position: absolute;
  inset: auto 0 0;
  padding: var(--space-sm) var(--space-md);
  background: linear-gradient(transparent, rgba(0,0,0,.65));
  color: #fff;
  font-size: 0.8rem;
  line-height: 1.4;
  transform: translateY(100%);
  transition: transform var(--transition);
  pointer-events: none;
}

.photo-item:hover figcaption,
.photo-item:focus-visible figcaption { transform: translateY(0); }

.no-photos {
  color: var(--clr-text-muted);
  font-style: italic;
  padding: var(--space-xl) 0;
}

/* ---------------------------------------------------------
   Lightbox
   --------------------------------------------------------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: var(--clr-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  opacity: 0;
  transition: opacity 200ms ease;
}

.lightbox:not([hidden]) { opacity: 1; }
.lightbox[hidden] { display: none !important; }

/* Buttons */
.lb-close,
.lb-prev,
.lb-next {
  position: absolute;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 50%;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), transform var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.lb-close:hover, .lb-prev:hover, .lb-next:hover {
  background: rgba(255,255,255,.28);
  transform: scale(1.1);
}

.lb-close {
  top: var(--space-md);
  right: var(--space-md);
  width: 42px;
  height: 42px;
  font-size: 1.4rem;
}

.lb-prev,
.lb-next {
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  font-size: 1.8rem;
}

.lb-prev { left: var(--space-md); }
.lb-next { right: var(--space-md); }

.lb-prev:hover { transform: translateY(-50%) scale(1.1); }
.lb-next:hover { transform: translateY(-50%) scale(1.1); }

/* Figure */
.lb-figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 90vw;
  max-height: 90dvh;
}

.lb-img {
  max-width: 90vw;
  max-height: 80dvh;
  object-fit: contain;
  border-radius: var(--radius-sm);
  box-shadow: 0 8px 40px rgba(0,0,0,.5);
  transition: opacity 150ms ease;
}

.lb-caption {
  margin-top: var(--space-sm);
  color: rgba(255,255,255,.85);
  font-size: 0.875rem;
  text-align: center;
  max-width: 60ch;
  line-height: 1.5;
}

/* ---------------------------------------------------------
   Site footer
   --------------------------------------------------------- */
.site-footer {
  padding: var(--space-lg) var(--space-md);
  text-align: center;
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  border-top: 1px solid var(--clr-border);
}

/* ---------------------------------------------------------
   Utilities / Animations
   --------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
}