/* ==========================================================================
   OlahFoto Studio - Ultra-Clean Minimalist Studio Theme
   Light Theme (Clean Porcelain / Apple & Figma Studio Style)
   Dark Theme (Deep Slate / Obsidian Studio Style)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root {
  /* LIGHT THEME TOKENS */
  --bg-app: #f1f5f9;
  --bg-panel: #ffffff;
  --bg-panel-header: #ffffff;
  --bg-workspace: #e2e8f0;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-input: #ffffff;
  --bg-subtle: #f8fafc;
  --bg-subtle-hover: #f1f5f9;
  --bg-modal-overlay: rgba(15, 23, 42, 0.5);
  
  --text-main: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --text-inverse: #ffffff;
  
  --border-color: #cbd5e1;
  --border-subtle: #e2e8f0;
  --border-focus: #0284c7;

  --accent-primary: #0284c7;
  --accent-hover: #0369a1;
  --accent-subtle: #e0f2fe;
  --accent-text: #0369a1;
  --accent-gradient: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);

  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.06), 0 1px 2px -1px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 10px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 12px 28px -4px rgba(0, 0, 0, 0.12), 0 4px 8px -2px rgba(0, 0, 0, 0.05);
  --shadow-glow: 0 0 0 3px rgba(2, 132, 199, 0.18);

  --slider-track: #cbd5e1;
  --slider-thumb: #0284c7;

  --canvas-checker-1: #e2e8f0;
  --canvas-checker-2: #ffffff;
}

html.dark {
  /* DARK THEME TOKENS */
  --bg-app: #090d16;
  --bg-panel: #0f172a;
  --bg-panel-header: #0f172a;
  --bg-workspace: #070a10;
  --bg-card: #141d2e;
  --bg-card-hover: #1e293b;
  --bg-input: #07090e;
  --bg-subtle: rgba(255, 255, 255, 0.05);
  --bg-subtle-hover: rgba(255, 255, 255, 0.08);
  --bg-modal-overlay: rgba(7, 9, 14, 0.8);

  --text-main: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-light: #64748b;
  --text-inverse: #0f172a;

  --border-color: rgba(255, 255, 255, 0.1);
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-focus: #38bdf8;

  --accent-primary: #06b6d4;
  --accent-hover: #0891b2;
  --accent-subtle: rgba(6, 182, 212, 0.16);
  --accent-text: #38bdf8;
  --accent-gradient: linear-gradient(135deg, #0284c7 0%, #06b6d4 100%);

  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 14px 0 rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 14px 34px 0 rgba(0, 0, 0, 0.55);
  --shadow-glow: 0 0 16px rgba(6, 182, 212, 0.25);

  --slider-track: #334155;
  --slider-thumb: #06b6d4;

  --canvas-checker-1: #1e293b;
  --canvas-checker-2: #0f172a;
}

/* --------------------------------------------------
   GLOBAL RESET & TYPOGRAPHY
   -------------------------------------------------- */
* {
  box-sizing: border-box;
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-app);
  color: var(--text-main);
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* --------------------------------------------------
   1. STRUCTURAL PANELS & HEADERS
   -------------------------------------------------- */
.glass-panel {
  background-color: var(--bg-panel);
  border-color: var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.glass-panel-header {
  background-color: var(--bg-panel-header);
  border-color: var(--border-color);
  box-shadow: var(--shadow-xs);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.glass-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0.875rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-card:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
}

/* --------------------------------------------------
   2. NAVIGATION & TABS
   -------------------------------------------------- */
.mode-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.38rem 0.85rem;
  border-radius: 0.625rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: all 0.18s ease;
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
}

.mode-tab-btn:hover {
  color: var(--text-main);
  background: var(--bg-subtle-hover);
}

.mode-tab-btn.active {
  color: var(--accent-text);
  background: var(--bg-panel);
  border-color: var(--border-subtle);
  box-shadow: var(--shadow-xs);
}

html.dark .mode-tab-btn.active {
  background: var(--accent-subtle);
  border-color: var(--accent-primary);
}

.tool-nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 3.35rem;
  height: 3.35rem;
  border-radius: 0.75rem;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid transparent;
  transition: all 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  cursor: pointer;
}

.tool-nav-btn:hover {
  color: var(--text-main);
  background: var(--bg-subtle-hover);
  border-color: var(--border-subtle);
}

.tool-nav-btn.active {
  color: var(--accent-text);
  background: var(--accent-subtle);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-xs);
  font-weight: 700;
}

.tool-nav-btn.active::before {
  content: '';
  position: absolute;
  left: -2px;
  top: 25%;
  height: 50%;
  width: 3px;
  background: var(--accent-primary);
  border-radius: 9999px;
}

@media (max-width: 767px) {
  .tool-nav-btn.active::before {
    left: 25%;
    top: auto;
    bottom: -2px;
    height: 3px;
    width: 50%;
  }
}

/* --------------------------------------------------
   3. ACTION BUTTONS & ICONS
   -------------------------------------------------- */
.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  border-radius: 0.625rem;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: var(--shadow-sm);
  font-weight: 600;
  transition: all 0.18s ease;
  cursor: pointer;
}

.btn-primary:hover:not(:disabled) {
  opacity: 0.95;
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

.btn-secondary {
  background-color: var(--bg-panel);
  color: var(--text-secondary);
  border-radius: 0.625rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-xs);
  font-weight: 500;
  transition: all 0.18s ease;
  cursor: pointer;
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-subtle-hover);
  color: var(--text-main);
  border-color: var(--accent-primary);
}

.btn-secondary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  box-shadow: none;
}

.btn-icon {
  width: 2.15rem;
  height: 2.15rem;
  border-radius: 0.625rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  background-color: var(--bg-panel);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-xs);
  transition: all 0.18s ease;
  cursor: pointer;
}

.btn-icon:hover:not(:disabled) {
  color: var(--accent-text);
  background-color: var(--bg-subtle-hover);
  border-color: var(--accent-primary);
}

.btn-icon:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  box-shadow: none;
}

/* --------------------------------------------------
   4. FORM FIELDS & INPUTS
   -------------------------------------------------- */
.input-field {
  width: 100%;
  padding: 0.55rem 0.8rem;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 0.625rem;
  color: var(--text-main);
  outline: none;
  font-size: 0.8125rem;
  transition: all 0.18s ease;
}

.input-field::placeholder {
  color: var(--text-light);
}

.input-field:focus {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-glow);
}

/* --------------------------------------------------
   5. RANGE SLIDERS (MINIMALIST & CRISP)
   -------------------------------------------------- */
.range-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--slider-track);
  border-radius: 9999px;
  outline: none;
  cursor: pointer;
  transition: background 0.2s ease;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--slider-thumb);
  border: 2px solid #ffffff;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.range-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--slider-thumb);
  border: 2px solid #ffffff;
  cursor: pointer;
}

/* --------------------------------------------------
   6. RATIO & CONTROL PRESET BUTTONS
   -------------------------------------------------- */
.ratio-btn, 
.btn-control, 
.btn-preset-percent, 
.btn-brush-type, 
.btn-frame-style, 
.btn-sensor-mode, 
.btn-pasfoto, 
.btn-format, 
.btn-bulk-percent, 
.btn-bulk-format {
  padding: 0.45rem 0.55rem;
  background-color: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 0.55rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center;
  box-shadow: var(--shadow-xs);
  transition: all 0.18s ease;
  cursor: pointer;
}

.ratio-btn:hover, 
.btn-control:hover, 
.btn-preset-percent:hover, 
.btn-brush-type:hover, 
.btn-frame-style:hover, 
.btn-sensor-mode:hover, 
.btn-pasfoto:hover, 
.btn-format:hover, 
.btn-bulk-percent:hover, 
.btn-bulk-format:hover {
  color: var(--text-main);
  background-color: var(--bg-subtle-hover);
  border-color: var(--accent-primary);
}

.ratio-btn.active, 
.btn-control.active, 
.btn-preset-percent.active, 
.btn-brush-type.active, 
.btn-frame-style.active, 
.btn-sensor-mode.active, 
.btn-pasfoto.active, 
.btn-format.active, 
.btn-bulk-percent.active, 
.btn-bulk-format.active {
  color: var(--accent-text);
  background-color: var(--accent-subtle);
  border-color: var(--accent-primary);
  font-weight: 700;
  box-shadow: var(--shadow-xs);
}

.filter-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.45rem;
  background-color: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  gap: 0.35rem;
  box-shadow: var(--shadow-xs);
  cursor: pointer;
  transition: all 0.18s ease;
}

.filter-card:hover {
  border-color: var(--accent-primary);
  background-color: var(--bg-subtle-hover);
}

.filter-card.active {
  border-color: var(--accent-primary);
  background-color: var(--accent-subtle);
  box-shadow: var(--shadow-glow);
}

.bulk-item-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background-color: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.18s ease;
}

.bulk-item-card:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
}

.section-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-text);
  display: block;
}

/* --------------------------------------------------
   7. CANVAS WORKSPACE CONTAINER & CHECKERBOARD
   -------------------------------------------------- */
#canvas-container {
  background-color: var(--bg-workspace);
  transition: background-color 0.2s ease;
}

#canvas-outer-wrapper {
  background-color: var(--bg-panel);
  border-radius: 0;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
}

#main-canvas {
  background-image: 
    linear-gradient(45deg, var(--canvas-checker-1) 25%, transparent 25%),
    linear-gradient(-45deg, var(--canvas-checker-1) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--canvas-checker-1) 75%),
    linear-gradient(-45deg, transparent 75%, var(--canvas-checker-1) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
  background-color: var(--canvas-checker-2);
  display: block;
}

/* --------------------------------------------------
   8. MODALS & OVERLAYS
   -------------------------------------------------- */
#welcome-modal, #custom-alert-modal, #custom-confirm-modal {
  background-color: var(--bg-modal-overlay);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* --------------------------------------------------
   9. CUSTOM SCROLLBAR
   -------------------------------------------------- */
.custom-scrollbar::-webkit-scrollbar {
  width: 5px;
  height: 5px;
}

.custom-scrollbar::-webkit-scrollbar-track {
  background: transparent;
}

.custom-scrollbar::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 9999px;
}

.custom-scrollbar::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}