:root {
  --bg: #0f1417;
  --panel-bg: #f6f1e8;
  --panel-border: #2c3a40;
  --accent: #d64f2a;
  --text: #1e2a2f;
  --muted: #5b676c;
  --shadow: 0 14px 32px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  background: radial-gradient(circle at 20% 20%, #2b3840 0%, var(--bg) 60%);
}

#app {
  position: relative;
  width: 100vw;
  height: 100vh;
}

#patternCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.overlay-button {
  position: fixed;
  top: 14px;
  right: 14px;
  z-index: 20;
  border: 1px solid #101417;
  border-radius: 999px;
  background: linear-gradient(180deg, #f5f8fa 0%, #d7e0e7 100%);
  color: #152028;
  font-weight: 700;
  padding: 10px 18px;
  cursor: pointer;
}

.mode-badge {
  position: fixed;
  left: 50%;
  top: 16px;
  transform: translateX(-50%);
  z-index: 15;
  border-radius: 999px;
  padding: 8px 12px;
  background: rgba(20, 29, 34, 0.84);
  color: #f8f8f8;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  opacity: 0;
  pointer-events: none;
}

.mode-badge.visible {
  opacity: 1;
}

.mode-badge.fade-out {
  transition: opacity 1s ease;
}

.control-panel {
  position: fixed;
  top: 28px;
  left: 28px;
  width: min(420px, calc(100vw - 24px));
  max-height: calc(100vh - 24px);
  display: flex;
  flex-direction: column;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  background: var(--panel-bg);
  box-shadow: var(--shadow);
  color: var(--text);
  z-index: 30;
}

.control-panel.hidden {
  display: none;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-bottom: 1px solid #c8d0d4;
  cursor: move;
  user-select: none;
  background: linear-gradient(120deg, #ffedd8 0%, #d4e7e7 100%);
  border-radius: 12px 12px 0 0;
}

.panel-header h1 {
  margin: 0;
  font-size: 1rem;
}

.panel-content {
  overflow: auto;
  padding: 12px;
  display: grid;
  gap: 12px;
}

.control-group {
  display: grid;
  gap: 6px;
}

.preset-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.preset-row #presetSelect {
  width: auto;
  flex: 1 1 auto;
  min-width: 0;
}

.preset-color-controls {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.preset-color-button {
  border-color: #1b2730;
}

.preset-color-button .mode-toggle-icon {
  border-color: rgba(17, 23, 28, 0.38);
}

.preset-swap-button {
  width: 24px;
  height: 24px;
  padding: 0;
}

.preset-swap-icon {
  font-size: 0.95rem;
  line-height: 1;
  font-weight: 800;
  color: #f0f3f5;
  display: inline-block;
  transform: scaleX(0.82);
  transform-origin: center;
}

.shift-controls-group {
  border: 1px solid #b9c3c8;
  border-radius: 8px;
  padding: 8px;
}

.shift-controls-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.shift-controls-actions {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.shift-controls-mode-buttons {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.shift-reset-button {
  margin-right: 10px;
}

.checker-size-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.checker-size-title {
  font-size: 0.9rem;
  font-weight: 600;
}

.checker-preset-buttons {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.checker-preset-button {
  width: 24px;
  height: 24px;
  padding: 0;
  border-radius: 5px;
}

.checker-preset-button .mode-toggle-icon {
  width: 16px;
  height: 16px;
  font-size: 0.58rem;
}

.checker-preset-button.is-active,
.checker-preset-button[aria-pressed="true"] {
  background: #d64f2a;
  border-color: #9d2f13;
}

.checker-preset-button.is-active .mode-toggle-icon,
.checker-preset-button[aria-pressed="true"] .mode-toggle-icon {
  border-color: rgba(255, 247, 243, 0.95);
  color: #fff7f3;
}

.shift-controls-title {
  font-size: 0.9rem;
  font-weight: 600;
}

.shift-controls-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.cycle-caption {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.cycle-caption input[type="checkbox"] {
  width: 13px;
  height: 13px;
  margin: 0;
}

.cycle-caption.is-disabled {
  opacity: 0.58;
}

.shift-axis-group {
  border: 1px solid #d4dde1;
  border-radius: 8px;
  padding: 8px;
  background: #fbfdff;
}

.control-group.wheel-active {
  border: 1px solid #d64f2a;
  border-radius: 8px;
  padding: 8px;
  background: #fff3ee;
}

.control-group.is-disabled {
  opacity: 0.58;
}

.control-group.is-disabled input[type="range"] {
  cursor: not-allowed;
}

.control-group label,
.control-group legend {
  font-size: 0.9rem;
  font-weight: 600;
}

select,
input,
button,
textarea {
  font: inherit;
}

select,
input,
textarea {
  width: 100%;
  border: 1px solid #99a7af;
  border-radius: 8px;
  padding: 8px;
  background: #ffffff;
}

input[type="range"].wheel-active {
  accent-color: #d64f2a;
}

textarea {
  resize: vertical;
}

button {
  border: 1px solid #1d2a31;
  border-radius: 8px;
  background: #24363f;
  color: #f0f3f5;
  padding: 8px 10px;
  cursor: pointer;
}

button:hover {
  background: #1c2c33;
}

.inline-controls {
  display: flex;
  gap: 8px;
}

.mode-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0;
}

.mode-toggle-square {
  width: 24px;
  height: 24px;
  padding: 0;
  border-radius: 5px;
}

.mode-toggle-icon {
  width: 14px;
  height: 14px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.62rem;
  font-weight: 700;
  line-height: 1;
}

@media (max-width: 760px) {
  .preset-row {
    flex-wrap: wrap;
  }

  .preset-row #presetSelect {
    width: 100%;
    flex: 1 1 100%;
  }

  .shift-controls-grid {
    grid-template-columns: 1fr;
  }
}

.inline-controls input {
  flex: 1;
}

.inline-controls select {
  flex: 1;
}

.image-source-section output {
  display: block;
  max-width: 100%;
  word-break: break-word;
}

output {
  color: var(--muted);
  font-size: 0.86rem;
}

fieldset {
  border: 1px solid #b9c3c8;
  border-radius: 10px;
  padding: 10px;
}

.grid-two {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.grid-two > label {
  min-width: 0;
}

.subgrid-preset-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.subgrid-preset-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: #3b4a50;
  white-space: nowrap;
}

.bulk-toggle-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.bulk-toggle-row button {
  padding: 6px 8px;
}

.bulk-toggle-row .wide-button {
  grid-column: 1 / -1;
}

.bulk-toggle-row button.is-active {
  background: #d64f2a;
  border-color: #9d2f13;
}

.grid-two label {
  display: grid;
  gap: 4px;
  font-size: 0.8rem;
}

.info-box {
  border: 1px dashed #8ea0a8;
  border-radius: 8px;
  padding: 10px;
  background: #f9fbfc;
  font-size: 0.86rem;
  line-height: 1.35;
}

.help-text {
  margin: 0;
  color: #3f4d54;
  font-size: 0.82rem;
}

.report-modal {
  position: fixed;
  inset: 0;
  background: rgba(10, 14, 18, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 60;
}

.report-modal[hidden] {
  display: none;
}

.report-modal-card {
  width: min(640px, calc(100vw - 24px));
  max-height: calc(100vh - 24px);
  background: #f6f1e8;
  border: 1px solid #2c3a40;
  border-radius: 10px;
  padding: 12px;
  display: grid;
  gap: 10px;
}

.report-modal-card h2 {
  margin: 0;
  font-size: 1rem;
}

#selectionReportText {
  width: 100%;
  resize: vertical;
  font-family: Consolas, "Courier New", monospace;
  min-height: 220px;
}

.report-modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

kbd {
  border: 1px solid #8ea0a8;
  border-radius: 4px;
  padding: 1px 4px;
  background: #f3f6f8;
  font-family: Consolas, monospace;
}

@media (max-width: 760px) {
  .control-panel {
    top: 10px;
    left: 10px;
    width: calc(100vw - 20px);
    max-height: calc(100vh - 20px);
  }

  .grid-two {
    grid-template-columns: 1fr;
  }
}