* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary: #6366F1;
  --primary-light: #818CF8;
  --primary-dark: #4F46E5;
  --accent: #F59E0B;
  --accent-light: #FCD34D;
  --digital: #22D3EE;
  --bg-dark: #0F172A;
  --bg-panel: #1E293B;
  --bg-card: #334155;
  --text: #F1F5F9;
  --text-muted: #94A3B8;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2rem;
  color: var(--primary-light);
  margin-bottom: 0.5rem;
}

header p {
  color: var(--text-muted);
}

.main {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2rem;
}

/* Preview Panel */
.preview-panel {
  background: var(--bg-panel);
  border-radius: 16px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.preview-container {
  width: 100%;
  max-width: 512px;
  aspect-ratio: 1;
  background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-panel) 100%);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1.5rem;
}

#preview {
  width: 100%;
  height: 100%;
}

.preview-actions {
  display: flex;
  gap: 1rem;
}

.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

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

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

.btn-secondary {
  background: var(--bg-card);
  color: var(--text);
}

.btn-secondary:hover {
  background: var(--accent);
  color: var(--bg-dark);
}

.btn-slack {
  background: #4A154B;
  color: white;
}

.btn-slack:hover {
  background: #611f64;
}

.btn-accent {
  background: var(--accent);
  color: var(--bg-dark);
}

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

/* Background color picker */
.bg-picker {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  justify-content: center;
}

.bg-btn {
  width: 28px;
  height: 28px;
  border: 2px solid var(--bg-card);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}

.bg-btn:hover {
  border-color: var(--text-muted);
  transform: scale(1.1);
}

.bg-btn.active {
  border-color: var(--digital);
  box-shadow: 0 0 8px var(--digital);
}

/* Controls Panel */
.controls-panel {
  background: var(--bg-panel);
  border-radius: 16px;
  padding: 1.5rem;
  max-height: calc(100vh - 200px);
  overflow-y: auto;
}

.control-section {
  margin-bottom: 1.5rem;
}

.control-section h2 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.part-select {
  width: 100%;
  padding: 0.75rem;
  background: var(--bg-card);
  border: 2px solid transparent;
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
  transition: border-color 0.2s;
}

.part-select:hover,
.part-select:focus {
  border-color: var(--primary);
  outline: none;
}

.part-select option {
  background: var(--bg-card);
  color: var(--text);
}

/* Mode Buttons */
.mode-buttons {
  display: flex;
  gap: 0.5rem;
}

.mode-btn {
  flex: 1;
  padding: 0.5rem;
  background: var(--bg-card);
  border: 2px solid transparent;
  border-radius: 8px;
  color: var(--text);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
}

.mode-btn:hover {
  border-color: var(--digital);
}

.mode-btn.active {
  border-color: var(--digital);
  background: var(--digital);
  color: var(--bg-dark);
}

/* Preset Buttons */
.preset-buttons {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
}

.preset-btn {
  padding: 0.5rem;
  background: var(--bg-card);
  border: 2px solid transparent;
  border-radius: 8px;
  color: var(--text);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s;
}

.preset-btn:hover {
  border-color: var(--accent);
  background: var(--bg-dark);
}

.preset-btn.active {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--bg-dark);
}

/* Checkbox Group */
.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.checkbox-group label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem;
  background: var(--bg-card);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s;
}

.checkbox-group label:hover {
  background: var(--bg-dark);
}

.checkbox-group input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

/* Responsive */
@media (max-width: 768px) {
  .main {
    grid-template-columns: 1fr;
  }

  .controls-panel {
    max-height: none;
  }

  .preview-container {
    max-width: 320px;
  }
}

/* Scrollbar */
.controls-panel::-webkit-scrollbar {
  width: 8px;
}

.controls-panel::-webkit-scrollbar-track {
  background: var(--bg-dark);
  border-radius: 4px;
}

.controls-panel::-webkit-scrollbar-thumb {
  background: var(--bg-card);
  border-radius: 4px;
}

.controls-panel::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* Slack Icon Gallery */
.gallery-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--bg-card);
}

.gallery-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.gallery-header h2 {
  font-size: 1.5rem;
  color: var(--primary-light);
  margin: 0;
}

.gallery-header p {
  color: var(--text-muted);
  flex: 1;
  margin: 0;
}

.icon-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
  gap: 0.75rem;
}

.gallery-icon {
  aspect-ratio: 1;
  background: var(--bg-dark);
  border: 2px solid var(--bg-card);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.gallery-icon:hover {
  border-color: var(--primary);
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.gallery-icon svg {
  width: 100%;
  height: 100%;
}

.gallery-loading {
  grid-column: 1 / -1;
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
}

/* Sticker Pack Preview */
.sticker-pack-section {
  margin-bottom: 2rem;
}

.sticker-pack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1rem;
}

.sticker-item {
  aspect-ratio: 1;
  background: var(--bg-dark);
  border: 2px solid var(--bg-card);
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.2s;
  padding: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.sticker-item:hover {
  border-color: var(--accent);
  transform: scale(1.03);
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.3);
}

.sticker-item svg {
  width: 100%;
  height: 85%;
}

.sticker-item .sticker-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
  text-align: center;
}

/* Slack icons - head-only, cyan accent */
.slack-icons-section .sticker-pack-grid {
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 10px;
}

.slack-icon-item {
  padding: 4px;
  border-radius: 12px;
}

.slack-icon-item:hover {
  border-color: var(--digital);
  box-shadow: 0 4px 16px rgba(34, 211, 238, 0.3);
}

.slack-icon-item .sticker-label {
  font-size: 0.6rem;
  margin-top: 2px;
}

.slack-icons-section .gallery-header h2 {
  color: var(--digital);
}

/* Copyright Footer */
.copyright-footer {
  text-align: center;
  padding: 2rem 1rem;
  margin-top: 3rem;
  border-top: 1px solid var(--bg-card);
  color: var(--text-muted);
  font-size: 0.875rem;
}

.copyright-footer .legal-note {
  font-size: 0.75rem;
  margin-top: 0.5rem;
  opacity: 0.7;
}

.copyright-footer a {
  color: var(--digital);
  text-decoration: none;
}

.copyright-footer a:hover {
  text-decoration: underline;
}