:root {
  --background-color: #0d1117;
  --surface-color: #161b22;
  --primary-color: #238636;
  --primary-hover-color: #2ea043;
  --primary-gradient: linear-gradient(180deg, hsl(132, 63%, 42%), hsl(132, 63%, 32%));
  --on-surface-color: #e6edf3;
  --on-surface-variant-color: #7d8590;
  --error-color: #f85149;
  --error-surface-color: rgba(248, 81, 73, 0.1);
  --border-color: #30363d;
  --box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  --modal-backdrop: rgba(13, 17, 23, 0.9);
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --border-radius: 12px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-family);
  background-color: var(--background-color);
  color: var(--on-surface-color);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Header & Logo --- */
.site-header {
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border-color);
  text-align: center;
  background-color: var(--surface-color);
}

.header-logo {
  max-width: 250px;
  width: 70%;
  height: auto;
  display: inline-block;
  vertical-align: middle;
}

#root {
  padding: 0 2rem 2.5rem;
  max-width: 1600px;
  margin: 0 auto;
  opacity: 0;
  transition: opacity 0.5s ease-in-out;
}

#root.loaded {
  opacity: 1;
}

.gallery-title-container {
  text-align: center;
  padding: 2.5rem 1rem 2.5rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-color);
}

.gallery-title-container h1 {
  font-size: 2rem;
  font-weight: 600;
  margin: 0 0 0.5rem 0;
  color: var(--on-surface-color);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.gallery-title-container h1 svg {
  width: 28px;
  height: 28px;
  opacity: 0.9;
  stroke-width: 1.5;
  color: var(--primary-color);
}

.gallery-title-container p {
  font-size: 1.1rem;
  color: var(--on-surface-variant-color);
  margin: 0 auto;
  max-width: 65ch;
}


/* --- Navigation --- */
.folder-nav {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.nav-button {
  background-color: var(--surface-color);
  color: var(--on-surface-variant-color);
  border: 1px solid var(--border-color);
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 500;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-button:hover:not(:disabled) {
  background-color: #21262d;
  border-color: #8b949e;
  color: var(--on-surface-color);
}

.nav-button.active {
  background: var(--primary-color);
  color: #fff;
  font-weight: 600;
  border-color: var(--primary-color);
  box-shadow: 0 0 15px rgba(35, 134, 54, 0.4);
}

.nav-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background-color: var(--surface-color);
  border-color: var(--border-color);
  color: var(--on-surface-variant-color);
  box-shadow: none;
}

.nav-button:disabled:hover {
    background-color: var(--surface-color);
    border-color: var(--border-color);
}

.nav-button svg {
  width: 20px;
  height: 20px;
  stroke-width: 2;
  opacity: 0.9;
}

/* --- Status & Messages --- */
.status-message {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  min-height: 40vh;
  font-size: 1.2rem;
  color: var(--on-surface-variant-color);
  text-align: center;
  padding: 1rem;
}

.error-message {
  background-color: var(--error-surface-color);
  color: var(--error-color);
  border-radius: var(--border-radius);
  padding: 2rem;
  height: auto;
  min-height: 200px;
  border: 1px solid var(--error-color);
}

.error-message p {
    color: var(--error-color);
    max-width: 600px;
}
.error-message svg {
  width: 48px;
  height: 48px;
  margin-bottom: 1rem;
}

.loader {
  border: 4px solid var(--surface-color);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin-bottom: 1rem;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* --- Photo Gallery --- */
.photo-gallery {
  column-count: 4;
  column-gap: 1rem;
}

.photo-card {
  margin-bottom: 1rem;
  display: inline-block;
  width: 100%;
  border-radius: var(--border-radius);
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  aspect-ratio: 4 / 3;
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
}

.photo-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--box-shadow);
  border-color: #8b949e;
}

.photo-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease, filter 0.4s ease;
}

.photo-card:hover img {
    transform: scale(1.05);
    filter: brightness(1.1);
}

/* Skeleton Loader */
.skeleton-card {
  background-color: var(--surface-color);
  border-radius: var(--border-radius);
  margin-bottom: 1rem;
  aspect-ratio: 4 / 3;
  background: linear-gradient(90deg, var(--surface-color) 25%, #2a2a2a 50%, var(--surface-color) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* --- Gallery Footer (Load More Button & Count) --- */
.gallery-footer {
  text-align: center;
  padding: 2rem 0 1rem;
}

.photo-count-indicator {
  color: var(--on-surface-variant-color);
  font-size: 0.95rem;
  margin: 0 0 1.25rem 0;
}

.load-more-button {
  background-color: var(--surface-color);
  color: var(--on-surface-variant-color);
  border: 1px solid var(--border-color);
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 500;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.load-more-button:hover {
  background-color: #21262d;
  border-color: #8b949e;
  color: var(--on-surface-color);
}

.load-more-button svg {
  width: 20px;
  height: 20px;
  stroke-width: 2;
  transition: transform 0.2s ease-in-out;
}

.load-more-button:hover svg {
  transform: translateY(2px);
}


/* --- Modal Styles --- */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--modal-backdrop);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  padding: 1rem;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-content {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 1rem;
  border-radius: 16px;
  width: 100%;
  height: 100%;
  max-width: 95vw;
  max-height: 95vh;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--box-shadow);
  animation: scaleIn 0.3s cubic-bezier(0.25, 1, 0.5, 1);
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

.modal-header {
  flex-shrink: 0;
  text-align: center;
  padding: 0 4rem 1rem 4rem;
  color: var(--on-surface-variant-color);
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1rem;
}

.modal-image-container {
  flex-grow: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  position: relative;
  min-height: 200px;
}

.modal-image {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 8px;
  opacity: 0;
  transition: opacity 0.4s ease-in-out;
}
.modal-image.loaded {
  opacity: 1;
}

.modal-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  flex-shrink: 0;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  margin-top: 1rem;
}

.download-button {
  background: var(--primary-color);
  color: white;
  border: 1px solid var(--primary-color);
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  text-decoration: none;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.download-button:hover {
  background: var(--primary-hover-color);
  border-color: var(--primary-hover-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(35, 134, 54, 0.3);
}
.download-button:nth-child(2) {
  background: transparent;
  border-color: var(--border-color);
  color: var(--on-surface-variant-color);
}
.download-button:nth-child(2):hover {
  background: var(--surface-color);
  border-color: #8b949e;
  color: var(--on-surface-color);
}


.download-button svg {
  width: 20px;
  height: 20px;
}

.modal-nav-button,
.modal-close-button {
  position: absolute;
  background: rgba(30, 30, 30, 0.7);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  line-height: 1;
  transition: all 0.2s ease;
  backdrop-filter: blur(5px);
  z-index: 1010;
}
.modal-nav-button:hover,
.modal-close-button:hover {
  background: rgba(0, 0, 0, 0.8);
  transform: scale(1.1);
}

.modal-nav-button {
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  font-size: 2rem;
}
.modal-nav-button.prev { left: 20px; }
.modal-nav-button.next { right: 20px; }

.modal-close-button {
  top: 20px;
  right: 20px;
  width: 38px;
  height: 38px;
  font-size: 1.8rem;
}

/* --- Disclaimer Section --- */
.disclaimer-section {
  max-width: 900px;
  margin: 4rem auto 2rem auto;
  padding: 2.5rem;
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--on-surface-variant-color);
  font-size: 0.95rem;
  line-height: 1.7;
}

.disclaimer-section h2 {
  color: var(--on-surface-color);
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: 1.5rem;
  text-align: center;
}

.disclaimer-section p {
  margin-top: 0;
  margin-bottom: 1.25rem;
}
.disclaimer-section p:last-child {
  margin-bottom: 0;
}

.disclaimer-section strong {
  color: var(--on-surface-color);
  font-weight: 600;
}

.disclaimer-section .disclaimer-outro {
  margin-top: 1.5rem;
  font-style: italic;
  text-align: center;
}

/* --- Footer --- */
.site-footer-main {
  padding: 2rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--background-color);
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-footer-main .footer-logo {
  height: 35px;
  opacity: 0.6;
  filter: grayscale(80%);
}

.site-footer-main p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--on-surface-variant-color);
}

/* --- Responsive Design --- */
@media (max-width: 1200px) {
  .photo-gallery { column-count: 3; }
}

@media (max-width: 800px) {
  .photo-gallery { column-count: 2; }
  #root { padding: 0 1rem 1.5rem; }
  .gallery-title-container h1 { font-size: 1.8rem; }
  .gallery-title-container p { font-size: 1rem; }
  .gallery-title-container { padding: 2rem 1rem; margin-bottom: 2rem; }
  .disclaimer-section {
    margin: 3rem 1rem 1.5rem 1rem;
    padding: 1.5rem;
  }
}

@media (max-width: 600px) {
  .photo-gallery { column-count: 2; }
  
  .modal-content { padding: 0.5rem; max-width: 100vw; max-height: 100vh; border-radius: 0; border: none; }
  .modal-header, .modal-controls { padding-left: 1rem; padding-right: 1rem; }
  .modal-close-button { top: 10px; right: 10px; }
  .modal-nav-button {
    width: 40px;
    height: 40px;
    font-size: 1.5rem;
  }
  .modal-nav-button.prev { left: 10px; }
  .modal-nav-button.next { right: 10px; }

  .modal-controls { flex-direction: column; align-items: stretch; }
  .download-button { width: 100%; }

}

@media (max-width: 480px) {
  .photo-gallery { column-count: 1; }
  .folder-nav { gap: 0.5rem; }
  .nav-button { padding: 10px 16px; font-size: 0.9rem;}
}