/* ============================================
   HALFTONE STUDIO - STYLES
   ============================================ */

:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-tertiary: #1a1a1a;
  --bg-elevated: #222222;
  --border: #2a2a2a;
  --border-light: #333333;
  --text-primary: #fafafa;
  --text-secondary: #a1a1a1;
  --text-muted: #666666;
  --accent: #ec4899;
  --accent-hover: #f472b6;
  --accent-muted: rgba(236, 72, 153, 0.15);
  --secondary: #8b5cf6;
  --secondary-muted: rgba(139, 92, 246, 0.15);
  --tertiary: #06b6d4;
  --tertiary-muted: rgba(6, 182, 212, 0.15);
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --radius: 0px;
  --transition: 0.15s ease;
}

/* ============================================
   RESET & BASE
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  overflow: hidden;
}

/* ============================================
   LAYOUT
   ============================================ */
.app {
  display: flex;
  height: 100vh;
}

.canvas-area {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

#halftoneCanvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
}

/* ============================================
   SIDEBAR
   ============================================ */
.sidebar {
  position: fixed;
  right: 0;
  top: 0;
  width: 380px;
  height: 100vh;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform 0.3s ease;
  z-index: 100;
}

.sidebar.hidden {
  transform: translateX(100%);
}

.sidebar-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-tertiary);
}

.sidebar-header h1 {
  font-size: 16px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.02em;
}

.sidebar-header h1 i {
  color: var(--accent);
  font-size: 20px;
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 20px 24px;
}

.sidebar-content::-webkit-scrollbar {
  width: 6px;
}

.sidebar-content::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar-content::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

.sidebar-content::-webkit-scrollbar-thumb:hover {
  background: var(--border-light);
}

/* ============================================
   SECTIONS
   ============================================ */
.section {
  margin-bottom: 28px;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}

.section-header i {
  font-size: 14px;
  color: var(--accent);
}

.section-header h3 {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition);
  border-radius: var(--radius);
  font-family: inherit;
}

.btn:hover {
  background: var(--bg-elevated);
  border-color: var(--border-light);
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-sm {
  padding: 6px 10px;
  font-size: 12px;
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
}

.btn-icon i {
  font-size: 18px;
}

/* ============================================
   BUTTON GRIDS
   ============================================ */
.btn-grid {
  display: grid;
  gap: 6px;
}

.btn-grid-2 { grid-template-columns: 1fr 1fr; }
.btn-grid-3 { grid-template-columns: 1fr 1fr 1fr; }
.btn-grid-4 { grid-template-columns: 1fr 1fr 1fr 1fr; }
.btn-grid-5 { grid-template-columns: 1fr 1fr 1fr 1fr 1fr; }
.btn-grid-6 { grid-template-columns: 1fr 1fr 1fr 1fr 1fr 1fr; }

.btn-grid .btn {
  padding: 10px 8px;
  flex-direction: column;
  gap: 4px;
}

.btn-grid .btn .icon {
  font-size: 16px;
  line-height: 1;
}

.btn-grid .btn .label {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

.btn-grid .btn.active {
  background: var(--accent-muted);
  border-color: var(--accent);
  color: var(--accent);
}

.btn-grid .btn.active .label {
  color: var(--accent);
}

/* ============================================
   TABS
   ============================================ */
.tabs {
  display: flex;
  gap: 2px;
  background: var(--bg-primary);
  padding: 4px;
  margin-bottom: 12px;
}

.tab {
  flex: 1;
  padding: 8px 12px;
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.tab:hover {
  color: var(--text-secondary);
  background: var(--bg-tertiary);
}

.tab.active {
  background: var(--accent);
  color: white;
}

/* ============================================
   FORM CONTROLS
   ============================================ */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.form-label span {
  font-size: 12px;
  color: var(--text-secondary);
}

.form-label .value {
  font-family: 'JetBrains Mono', 'SF Mono', Monaco, monospace;
  font-size: 11px;
  color: var(--accent);
  background: var(--accent-muted);
  padding: 2px 6px;
}

input[type="range"] {
  width: 100%;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  outline: none;
  border-radius: var(--radius);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--accent);
  cursor: pointer;
  border-radius: var(--radius);
  border: none;
  transition: transform var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

input[type="text"] {
  width: 100%;
  padding: 10px 12px;
  font-size: 13px;
  font-family: 'JetBrains Mono', 'SF Mono', Monaco, monospace;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: var(--radius);
  outline: none;
  transition: border-color var(--transition);
}

input[type="text"]:focus {
  border-color: var(--accent);
}

input[type="text"]::placeholder {
  color: var(--text-muted);
}

/* ============================================
   COLOR PICKER
   ============================================ */
.color-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  padding: 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
}

.color-picker {
  position: relative;
  width: 36px;
  height: 36px;
  border: 2px solid var(--border);
  overflow: hidden;
  flex-shrink: 0;
}

.color-picker input {
  position: absolute;
  top: -10px;
  left: -10px;
  width: 60px;
  height: 60px;
  border: none;
  cursor: pointer;
}

.color-info {
  flex: 1;
}

.color-info .label {
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

.color-info .hex {
  font-family: 'JetBrains Mono', 'SF Mono', Monaco, monospace;
  font-size: 12px;
  color: var(--text-primary);
}

.color-preview {
  display: flex;
  height: 6px;
  margin-top: 12px;
  border: 1px solid var(--border);
}

.color-preview div {
  flex: 1;
}

/* ============================================
   TOGGLE SWITCH
   ============================================ */
.toggle-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.toggle-row:last-child {
  border-bottom: none;
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-secondary);
}

.toggle-label i {
  font-size: 16px;
  color: var(--text-muted);
}

.toggle {
  position: relative;
  width: 44px;
  height: 24px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.2s ease;
}

.toggle::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  background: var(--text-muted);
  transition: all 0.2s ease;
}

.toggle.active {
  background: var(--accent-muted);
  border-color: var(--accent);
}

.toggle.active::after {
  left: 23px;
  background: var(--accent);
}

/* ============================================
   UPLOAD AREA
   ============================================ */
.upload-area {
  border: 2px dashed var(--border);
  padding: 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-bottom: 12px;
}

.upload-area:hover {
  border-color: var(--accent);
  background: var(--accent-muted);
}

.upload-area i {
  font-size: 28px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.upload-area p {
  font-size: 12px;
  color: var(--text-muted);
}

.upload-area.has-image {
  border-color: var(--success);
  background: rgba(16, 185, 129, 0.1);
}

.upload-area.has-image i {
  color: var(--success);
}

.upload-area.has-image p {
  color: var(--success);
}

#imageInput {
  display: none;
}

/* ============================================
   PRESETS
   ============================================ */
.preset-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}

.preset {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 10px 6px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all var(--transition);
}

.preset:hover {
  border-color: var(--accent);
  background: var(--accent-muted);
}

.preset-colors {
  display: flex;
  gap: 2px;
}

.preset-colors span {
  width: 12px;
  height: 12px;
  border: 1px solid rgba(255,255,255,0.1);
}

.preset-name {
  font-size: 9px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ============================================
   CHARACTER POOLS
   ============================================ */
.char-pool-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.char-pool-row {
  display: flex;
  gap: 12px;
  padding: 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
}

.pool-color {
  width: 4px;
  flex-shrink: 0;
}

.pool-content {
  flex: 1;
}

.pool-label {
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.pool-input-row {
  display: flex;
  gap: 6px;
  margin-bottom: 8px;
}

.pool-input-row input {
  flex: 1;
  padding: 8px 10px;
  font-size: 12px;
}

.char-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.char-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-primary);
}

/* ============================================
   DOWNLOAD SECTION
   ============================================ */
.download-section {
  padding: 16px 24px;
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border);
}

.download-main {
  margin-bottom: 12px;
}

.download-main .btn {
  width: 100%;
  padding: 14px 20px;
  font-size: 14px;
}

.download-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.download-options .btn {
  flex-direction: column;
  padding: 10px 8px;
  gap: 4px;
}

.download-options .btn span {
  font-size: 10px;
  color: var(--text-muted);
}

/* ============================================
   MODAL
   ============================================ */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  width: 480px;
  max-width: 90vw;
  max-height: 90vh;
  overflow: auto;
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-tertiary);
}

.modal-header h2 {
  font-size: 16px;
  font-weight: 600;
}

.modal-body {
  padding: 24px;
}

.export-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.export-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 24px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.export-btn:hover {
  border-color: var(--accent);
  background: var(--accent-muted);
}

.export-btn i {
  font-size: 32px;
}

.export-btn strong {
  font-size: 14px;
}

.export-btn span {
  font-size: 11px;
  color: var(--text-muted);
}

.export-secondary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

/* ============================================
   TOGGLE SIDEBAR BUTTON
   ============================================ */
.toggle-sidebar-btn {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1000;
  display: none;
  background: var(--bg-secondary);
  border-color: var(--border);
}

.sidebar.hidden ~ .toggle-sidebar-btn {
  display: flex;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 900px) {
  .toggle-sidebar-btn {
    display: flex;
  }
}

@media (max-width: 600px) {
  .sidebar {
    width: 100%;
  }

  .preset-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .btn-grid-6 {
    grid-template-columns: repeat(4, 1fr);
  }
}