/* ==========================================================================
   Fluid Palette - Art Studio | Material Design 3 (Material UI) Components
   (Standardized M3 Cards, Buttons, Chips, Dialogs, Sliders, Protection, & Grid)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Layout Sections & Typography Tags
   -------------------------------------------------------------------------- */
.section {
  padding: 64px 0;
}

.section-header {
  margin-bottom: 40px;
  max-width: 720px;
}

.section-tag, .eyebrow, .md-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--md-sys-color-on-primary-container);
  background: var(--md-sys-color-primary-container);
  padding: 4px 12px;
  border-radius: var(--md-shape-full);
  margin-bottom: 12px;
}

.mono-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

/* --------------------------------------------------------------------------
   2. Material Design 3 Cards (Elevated, Outlined, Filled)
   -------------------------------------------------------------------------- */
.gallery-grid, .photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}

.md-card, .art-card, .photo-card {
  background-color: var(--md-sys-color-surface-container-low);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-shape-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--md-elevation-1);
  transition: var(--transition-smooth);
  position: relative;
}

.md-card:hover, .art-card:hover, .photo-card:hover {
  box-shadow: var(--md-elevation-3);
  transform: translateY(-4px);
  border-color: var(--md-sys-color-outline);
}

.art-card-media, .photo-card-media {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background-color: var(--md-sys-color-surface-container-highest);
  cursor: pointer;
}

.art-card-media img, .photo-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s cubic-bezier(0.2, 0, 0, 1);
  display: block;
}

.art-card:hover .art-card-media img, .photo-card:hover .photo-card-media img {
  transform: scale(1.04);
}

.art-card-body, .photo-card-body {
  padding: 22px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.art-card-meta, .photo-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.art-category, .photo-category {
  font-size: 0.76rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--md-sys-color-primary);
}

.art-card-title, .photo-card-title {
  font-size: 1.22rem;
  font-family: var(--font-serif);
  margin-bottom: 8px;
  color: var(--md-sys-color-on-surface);
  line-height: 1.3;
}

.art-card-desc, .photo-card-desc {
  font-size: 0.88rem;
  color: var(--md-sys-color-on-surface-variant);
  line-height: 1.5;
  margin-bottom: 16px;
  flex: 1;
}

.art-card-footer, .photo-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--md-sys-color-outline-variant);
  gap: 12px;
}

.swatch-dots {
  display: flex;
  gap: 5px;
  align-items: center;
}

.swatch-dot {
  width: 13px;
  height: 13px;
  border-radius: var(--md-shape-full);
  border: 1px solid rgba(0, 0, 0, 0.15);
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
  display: inline-block;
}

.pigment-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-bottom: 12px;
}

.pigment-tag {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface-variant);
  padding: 2px 8px;
  border-radius: var(--md-shape-xs);
}

/* --------------------------------------------------------------------------
   3. Material UI Buttons
   -------------------------------------------------------------------------- */
.md-btn, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--md-shape-sm);
  font-family: var(--font-sans);
  font-size: 0.90rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition-smooth);
  text-decoration: none;
  line-height: 1;
}

.md-btn-filled, .btn-primary {
  background-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  box-shadow: var(--md-elevation-1);
}

.md-btn-filled:hover, .btn-primary:hover {
  box-shadow: var(--md-elevation-2);
  transform: translateY(-1px);
  filter: brightness(1.08);
}

.md-btn-outlined, .btn-secondary {
  background-color: transparent;
  color: var(--md-sys-color-on-surface);
  border-color: var(--md-sys-color-outline);
}

.md-btn-outlined:hover, .btn-secondary:hover {
  background-color: var(--md-sys-color-surface-container);
  border-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-primary);
}

.md-btn-text, .btn-text {
  background: transparent;
  color: var(--md-sys-color-primary);
  padding: 8px 12px;
}

.md-btn-text:hover, .btn-text:hover {
  background: var(--md-sys-color-surface-container);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.82rem;
}

/* --------------------------------------------------------------------------
   4. Material UI Filter Chips
   -------------------------------------------------------------------------- */
.filter-pills, .md-chips {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 28px;
}

.filter-pill, .filter-chip, .md-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: var(--md-shape-full);
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--md-sys-color-on-surface-variant);
  background: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline-variant);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.filter-pill:hover, .md-chip:hover {
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-primary);
}

.filter-pill.active, .md-chip.active {
  background: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  border-color: var(--md-sys-color-primary);
  box-shadow: var(--md-elevation-1);
}

/* --------------------------------------------------------------------------
   5. Interactive Watercolor Pigment Mixer Studio
   -------------------------------------------------------------------------- */
.studio-mixer-box {
  background: var(--md-sys-color-surface-container-low);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-shape-lg);
  overflow: hidden;
  box-shadow: var(--md-elevation-2);
}

.mixer-header {
  padding: 20px 24px;
  background: var(--md-sys-color-surface-container);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
}

.mixer-canvas-container {
  position: relative;
  width: 100%;
  height: 440px;
  background: #fcf8f2;
  cursor: crosshair;
  touch-action: none;
}

.mixer-canvas-container canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.palette-wells-row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.pigment-well-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--md-shape-full);
  border: 2px solid var(--md-sys-color-surface);
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.18);
  transition: transform 0.2s cubic-bezier(0.2, 0, 0, 1);
  outline: none;
}

.pigment-well-btn:hover {
  transform: scale(1.15);
}

.pigment-well-btn.selected {
  transform: scale(1.22);
  box-shadow: 0 0 0 2px var(--md-sys-color-primary);
}

.mixer-controls {
  padding: 16px 24px;
  background: var(--md-sys-color-surface-container);
  border-top: 1px solid var(--md-sys-color-outline-variant);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.slider-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.range-input, .md-slider {
  accent-color: var(--md-sys-color-primary);
  cursor: pointer;
}

/* --------------------------------------------------------------------------
   6. Material UI Dialogs & Lightbox Modals
   -------------------------------------------------------------------------- */
.lightbox-modal, .photo-modal, .md-dialog {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
  background: var(--md-sys-color-scrim);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  transition: opacity 0.3s cubic-bezier(0.2, 0, 0, 1);
}

.lightbox-modal.active, .photo-modal.active, .md-dialog.active {
  display: flex;
  opacity: 1;
}

.lightbox-content, .photo-modal-content, .md-dialog-container {
  background: var(--md-sys-color-surface);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-shape-xl);
  max-width: 960px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--md-elevation-4);
  position: relative;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
}

.lightbox-media, .photo-modal-media {
  background: var(--md-sys-color-surface-container-highest);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.lightbox-media img, .photo-modal-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-height: 520px;
  display: block;
}

.lightbox-body, .photo-modal-body {
  padding: 32px;
  display: flex;
  flex-direction: column;
}

.modal-close-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 20;
  width: 36px;
  height: 36px;
  border-radius: var(--md-shape-full);
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface);
  border: 1px solid var(--md-sys-color-outline-variant);
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.modal-close-btn:hover {
  background: var(--md-sys-color-error, #ba1a1a);
  color: #ffffff;
  transform: scale(1.08);
}

/* --------------------------------------------------------------------------
   7. Anti-Download Image Protection & Dynamic Watermark Overlays
   -------------------------------------------------------------------------- */
.protected-image-container {
  position: relative;
  user-select: none;
  -webkit-user-select: none;
}

.image-shield {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  background: transparent;
  pointer-events: auto;
}

.watermark-overlay {
  position: absolute;
  z-index: 12;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: #ffffff;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.8), 0 0 8px rgba(0, 0, 0, 0.5);
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
}

.wm-diagonal {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-25deg);
  font-size: 0.95rem;
  padding: 4px 14px;
  border: 1px dashed rgba(255, 255, 255, 0.4);
  border-radius: 4px;
}

.wm-center {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.3);
  padding: 4px 10px;
  border-radius: 4px;
}

.wm-bottom-right {
  bottom: 12px;
  right: 14px;
  font-size: 0.78rem;
  background: rgba(0, 0, 0, 0.35);
  padding: 2px 8px;
  border-radius: 4px;
}

.art-protect-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  background: var(--md-sys-color-inverse-surface, #313033);
  color: var(--md-sys-color-inverse-on-surface, #f4eff4);
  padding: 12px 24px;
  border-radius: var(--md-shape-full);
  font-size: 0.86rem;
  box-shadow: var(--md-elevation-3);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideUpToast 0.3s cubic-bezier(0.2, 0, 0, 1);
}

@keyframes slideUpToast {
  from { opacity: 0; transform: translate(-50%, 16px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* --------------------------------------------------------------------------
   8. Ad-Friendly Architecture Containers
   -------------------------------------------------------------------------- */
.ad-slot-container {
  margin: 32px auto;
  padding: 16px;
  background: var(--md-sys-color-surface-container-low);
  border: 1px dashed var(--md-sys-color-outline-variant);
  border-radius: var(--md-shape-md);
  text-align: center;
  max-width: 728px;
}

.ad-slot-label {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--md-sys-color-outline);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
  display: block;
}

/* --------------------------------------------------------------------------
   9. Responsive Adaptations (Mobile < 768px, Small < 480px)
   -------------------------------------------------------------------------- */
@media (max-width: 900px) {
  .lightbox-content, .photo-modal-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 44px 0;
  }
  .gallery-grid, .photo-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .mixer-canvas-container {
    height: 320px;
  }
  .mixer-controls {
    flex-direction: column;
    align-items: flex-start;
  }
}