:root {
  --sidebar-bg: #1a1a1a;
  --preview-bg: #252525;
  --text-primary: #ffffff;
  --text-muted: #888888;
  --text-placeholder: #666666;
  --btn-primary-bg: #000000;
  --btn-primary-hover: #111111;
  --btn-primary-text: #ffffff;
  --btn-secondary-border: rgba(255, 255, 255, 0.45);
  --line: rgba(255, 255, 255, 0.2);
  --hover: rgba(255, 255, 255, 0.06);
  --open: rgba(255, 255, 255, 0.04);
  --logo-filter: brightness(0) invert(1);
  --category-logo-filter: brightness(0) invert(1);
  --category-logo-opacity: 1;
}

[data-theme='light'] {
  --sidebar-bg: #ffffff;
  --preview-bg: #f0efec;
  --text-primary: #1a1a1a;
  --text-muted: #888888;
  --text-placeholder: #999999;
  --btn-primary-bg: #1a1a1a;
  --btn-primary-hover: #000000;
  --btn-primary-text: #ffffff;
  --btn-secondary-border: rgba(26, 26, 26, 0.35);
  --line: rgba(26, 26, 26, 0.2);
  --hover: rgba(26, 26, 26, 0.05);
  --open: rgba(26, 26, 26, 0.04);
  --logo-filter: none;
  --category-logo-filter: brightness(0) saturate(100%);
  --category-logo-opacity: calc(229 / 255);
}

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

body {
  font-family: 'Roboto', system-ui, sans-serif;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--sidebar-bg);
}

.app {
  display: grid;
  grid-template-columns: 320px 1fr;
  min-height: 100vh;
}

.controls {
  padding: 2rem;
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.app-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-toggle {
  display: flex;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  line-height: 0;
  flex-shrink: 0;
}

.logo-toggle:hover {
  opacity: 0.75;
}

.app-logo {
  flex-shrink: 0;
  filter: var(--logo-filter);
  pointer-events: none;
}

.controls h1 {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text-primary);
}

.controls h2 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.collapsible-section {
  margin: 0;
}

.collapsible-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  width: 100%;
  padding: 0.65rem 0;
  border: none;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
  user-select: none;
  font-family: inherit;
  font-weight: 500;
}

.collapsible-trigger:hover {
  background: var(--hover);
}

.collapsible.is-open .collapsible-trigger {
  background: var(--open);
}

.collapsible-heading {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.collapsible-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-left: auto;
}

.collapsible-value {
  font-size: 0.9rem;
  color: var(--text-primary);
  max-width: 9rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: right;
}

.collapsible-chevron {
  width: 0.45rem;
  height: 0.45rem;
  border-right: 1.5px solid var(--text-muted);
  border-bottom: 1.5px solid var(--text-muted);
  transform: rotate(45deg);
  transition: transform 0.15s ease;
  flex-shrink: 0;
}

.collapsible.is-open .collapsible-chevron {
  transform: rotate(-135deg);
}

.collapsible-panel[hidden] {
  display: none;
}

.collapsible .checkbox-group,
.collapsible .radio-group {
  padding: 0.5rem 0 0.75rem;
}

.checkbox-group,
.radio-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text-primary);
}

label.disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.category-logo {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  object-fit: contain;
  filter: var(--category-logo-filter);
  opacity: var(--category-logo-opacity);
}

.toggle-option {
  font-size: 0.9rem;
  color: var(--text-muted);
}

input[type='checkbox'],
input[type='radio'] {
  accent-color: var(--text-primary);
}

.color-field {
  display: grid;
  grid-template-columns: 1fr 2.25rem;
  align-items: center;
  gap: 1rem;
}

.color-field h2 {
  margin-bottom: 0;
}

.color-field-heading {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  cursor: pointer;
}

.color-swatch {
  display: inline-flex;
  flex-shrink: 0;
  cursor: pointer;
  justify-self: end;
}

.color-swatch input[type='color'] {
  appearance: none;
  -webkit-appearance: none;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  overflow: hidden;
}

.color-swatch input[type='color']:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.color-swatch input[type='color']::-webkit-color-swatch-wrapper {
  padding: 0;
}

.color-swatch input[type='color']::-webkit-color-swatch {
  border: none;
  border-radius: 50%;
}

.color-swatch input[type='color']::-moz-color-swatch {
  border: none;
  border-radius: 50%;
}

#scacchi-outline-options {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

#scacchi-outline-options[hidden],
#scacchi-stroke-field[hidden],
#stemmi-stroke-field[hidden],
#necropoli-stroke-field[hidden],
#scacchi-color-section[hidden],
#tint-section[hidden],
#element-color-section[hidden],
#random-colors-section[hidden] {
  display: none;
}

.stroke-field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.stroke-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.stroke-field input[type='range'] {
  width: 100%;
  accent-color: var(--text-primary);
}

.description-size-field {
  margin-top: 1rem;
}

textarea {
  width: 100%;
  padding: 0.5rem 0;
  border: none;
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  resize: vertical;
}

textarea::placeholder {
  color: var(--text-placeholder);
}

.btn-primary,
.btn-secondary {
  padding: 0.6rem 1.2rem;
  font-family: inherit;
  font-weight: 500;
  font-size: 0.85rem;
  cursor: pointer;
  border: 1px solid transparent;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--btn-primary-hover);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--btn-secondary-border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--hover);
}

.btn-primary:disabled,
.btn-secondary:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.actions,
.export-group {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.preview-panel {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: var(--preview-bg);
}

.loading-spinner {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--preview-bg);
}

.loading-spinner[hidden] {
  display: none;
}

.spinner {
  width: 2.5rem;
  height: 2.5rem;
  border: 2px solid var(--line);
  border-top-color: var(--text-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.preview-frame {
  position: relative;
  max-width: 100%;
  max-height: calc(100vh - 4rem);
}

.preview-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 2rem;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  pointer-events: none;
}

.preview-placeholder[hidden] {
  display: none;
}

#preview {
  display: block;
  max-width: 100%;
  max-height: calc(100vh - 4rem);
  width: auto;
  height: auto;
}