:root {
  /* Light mode colors */
  --bg-gradient-start: #f8f9fa;
  --bg-gradient-end: #e9ecef;
  --text-color: #212529;
  --text-color-heading: #495057;
  --container-bg: rgba(255, 255, 255, 0.8);
  --container-border: rgba(0, 0, 0, 0.1);
  --copy-btn-bg: rgba(40, 167, 69, 0.85);
  --copy-btn-hover: rgba(40, 167, 69, 1);
  --open-btn-bg: rgba(108, 117, 125, 0.85);
  --open-btn-hover: rgba(108, 117, 125, 1);
}

/* Dark mode colors */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-gradient-start: #1f1f22;
    --bg-gradient-end: #232a33;
    --text-color: #e0e0e0;
    --text-color-heading: #e0e6f0;
    --container-bg: rgba(255, 255, 255, 0.05);
    --container-border: rgba(255, 255, 255, 0.1);
    --copy-btn-bg: rgba(34, 139, 34, 0.85);
    --copy-btn-hover: rgba(34, 139, 34, 1);
    --open-btn-bg: rgba(102, 51, 153, 0.85);
    --open-btn-hover: rgba(102, 51, 153, 1);
  }
}

/* Manual theme override classes */
html[data-theme="light"] {
  --bg-gradient-start: #f8f9fa;
  --bg-gradient-end: #e9ecef;
  --text-color: #212529;
  --text-color-heading: #495057;
  --container-bg: rgba(255, 255, 255, 0.8);
  --container-border: rgba(0, 0, 0, 0.1);
  --copy-btn-bg: rgba(40, 167, 69, 0.85);
  --copy-btn-hover: rgba(40, 167, 69, 1);
  --open-btn-bg: rgba(108, 117, 125, 0.85);
  --open-btn-hover: rgba(108, 117, 125, 1);
}

html[data-theme="dark"] {
  --bg-gradient-start: #1f1f22;
  --bg-gradient-end: #232a33;
  --text-color: #e0e0e0;
  --text-color-heading: #e0e6f0;
  --container-bg: rgba(255, 255, 255, 0.05);
  --container-border: rgba(255, 255, 255, 0.1);
  --copy-btn-bg: rgba(34, 139, 34, 0.85);
  --copy-btn-hover: rgba(34, 139, 34, 1);
  --open-btn-bg: rgba(102, 51, 153, 0.85);
  --open-btn-hover: rgba(102, 51, 153, 1);
}

html {
    margin: 0;
    padding: 0;
    min-height: 100%;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
    text-align: center;
    position: relative;
    /* Base light background - safe default for everyone */
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 25%, #f1f5f9 50%, #e2e8f0 75%, #f8fafc 100%);
    color: var(--text-color);
    transition: color 0.3s ease;
}

/* Dark mode overlay - only shows for dark preference or manual dark */
html::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* Base dark gradient */
    background: linear-gradient(135deg, #1a1a1d 0%, #2d3748 50%, #1f2937 100%);
    opacity: 0;
    z-index: -2;
    transition: opacity 0.6s ease;
    pointer-events: none;
}

/* Dark vignette overlay - only shows for dark preference or manual dark */
html::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* Dark charcoal vignette - lighter in center, darker at edges */
    background: radial-gradient(ellipse at center, rgba(45, 45, 48, 0.6) 0%, rgba(32, 32, 35, 0.8) 40%, rgba(20, 20, 23, 0.95) 100%);
    opacity: 0;
    z-index: -1;
    transition: opacity 0.6s ease;
    pointer-events: none;
}

/* Show dark overlays for system dark preference */
@media (prefers-color-scheme: dark) {
    html::before,
    html::after {
        opacity: 1;
    }
}

/* Manual theme overrides */
html[data-theme="dark"]::before,
html[data-theme="dark"]::after {
    opacity: 1;
}

html[data-theme="light"]::before,
html[data-theme="light"]::after {
    opacity: 0;
}
body {
  margin: 0;
  padding: 0;
}

h1 {
  margin-top: 1.5rem;
  color: var(--text-color-heading);
  letter-spacing: 1px;
}

.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--container-bg);
  border: 1px solid var(--container-border);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text-color);
  transition: all 0.3s ease;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.theme-toggle:hover {
  background: var(--copy-btn-bg);
  color: white;
}

/* Mobile theme toggle adjustments */
@media (max-width: 480px) {
    .theme-toggle {
        top: 12px;
        right: 12px;
        padding: 12px 16px;
        font-size: 0.8rem;
        border-radius: 6px;
        min-width: 44px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
}


#gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, 200px);
    gap: 4px;
    justify-content: center;
    margin: auto;
    padding: 40px;
}

/* Tablet responsiveness */
@media (max-width: 768px) {
    #gallery {
        padding: 12px;
        gap: 3px;
        grid-template-columns: repeat(auto-fit, 200px);
    }
    
    .image-container {
        width: 200px;
    }
}

/* Mobile responsiveness */
@media (max-width: 480px) {
    #gallery {
        padding: 12px;
        gap: 2px;
        grid-template-columns: repeat(auto-fit, 200px);
    }
    
    .image-container {
        width: 200px;
    }
    
    h1 {
        font-size: 1.5rem;
        margin-top: 1rem;
    }
}


.image-container {
  width: 200px;
  aspect-ratio: 1 / 1;
  background: transparent;
  border-radius: 12px;
  transition: transform 0.15s;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-container:hover {
  transform: scale(1.04);
}

.copy-btn {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--copy-btn-bg);
  color: #fff;
  border: none;
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 0.9rem;
  opacity: 0;
  cursor: pointer;
  transition: opacity 0.2s, background 0.2s;
  z-index: 2;
}

.copy-btn:hover {
  background: var(--copy-btn-hover);
}

.open-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--open-btn-bg);
  color: #fff;
  border: none;
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 0.9rem;
  opacity: 0;
  cursor: pointer;
  transition: opacity 0.2s, background 0.2s;
  z-index: 2;
}

.open-btn:hover {
  background: var(--open-btn-hover);
}

/* Mobile button adjustments */
@media (max-width: 480px) {
    .copy-btn,
    .open-btn {
        padding: 8px 12px;
        font-size: 0.75rem;
        top: 6px;
        border-radius: 8px;
    }
    
    .copy-btn {
        left: 6px;
    }
    
    .open-btn {
        right: 6px;
    }
    
    /* Show buttons more prominently on mobile since hover doesn't work well */
    .image-container .copy-btn,
    .image-container .open-btn {
        opacity: 0.9;
    }
    
    .image-container:hover .copy-btn,
    .image-container:hover .open-btn {
        opacity: 1;
    }
    
    /* Disable hover scale effect on touch devices */
    .image-container:hover {
        transform: none;
    }
}

/* Desktop hover behavior - only applies when not on mobile */
@media (min-width: 481px) {
    .image-container:hover .copy-btn,
    .image-container:hover .open-btn {
        opacity: 1;
    }
}

.image-container img {
  max-width: 90%;
  max-height: 90%;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 8px;
  display: block;
  margin: auto;
  background: transparent;
}