:root {
  --ink: #25221f;
  --muted: #716960;
  --line: #d7ddd9;
  --paper: #f5f7f5;
  --panel: #ffffff;
  --accent: #0e766a;
  --accent-strong: #095f56;
  --rose: #c85d7a;
  --gold: #d39f2d;
  --shadow: 0 18px 44px rgba(51, 42, 30, 0.13);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    linear-gradient(90deg, rgba(14, 118, 106, 0.09), transparent 32%),
    linear-gradient(160deg, rgba(200, 93, 122, 0.08), transparent 38%),
    var(--paper);
  overscroll-behavior: none;
  -webkit-text-size-adjust: 100%;
}

button,
input {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--ink);
  background: #fff;
  min-height: 42px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

button:hover {
  border-color: #a8b4ae;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.46;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(220px, 280px) minmax(0, 1fr) minmax(220px, 300px);
  gap: 16px;
  min-height: 100vh;
  min-height: 100dvh;
  padding: max(16px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) max(16px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
}

.panel {
  align-self: stretch;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}

.tools-panel,
.color-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 16px;
}

.brand {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 22px;
  line-height: 1.2;
}

h2 {
  font-size: 13px;
  letter-spacing: 0;
  color: var(--muted);
}

.brand p,
.status span,
.info-list span {
  color: var(--muted);
  font-size: 13px;
}

.file-picker {
  display: grid;
  place-items: center;
  min-height: 52px;
  border: 1px dashed #9aa9a3;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), #217e48);
  cursor: pointer;
}

.file-picker input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.tool-group {
  display: grid;
  gap: 10px;
}

.segmented,
.button-grid,
.number-grid {
  display: grid;
  gap: 8px;
}

.segmented {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.button-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.tool-button.active {
  border-color: var(--accent);
  color: #fff;
  background: var(--accent);
}

.tool-group label {
  display: grid;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  min-height: 36px;
}

.workspace {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 12px;
  min-width: 0;
  min-height: 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.86);
}

.status {
  display: grid;
  gap: 3px;
  min-width: 0;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.view-switch {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8faf8;
}

.view-switch button {
  min-height: 32px;
  padding: 0 9px;
  border-color: transparent;
  background: transparent;
  font-size: 13px;
}

.view-switch button.active {
  color: #fff;
  background: var(--accent);
}

.icon-button {
  display: grid;
  place-items: center;
  width: 40px;
  padding: 0;
  font-size: 20px;
}

.canvas-stage {
  position: relative;
  overflow: hidden;
  min-height: 520px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background-color: #fff;
  background-image:
    linear-gradient(45deg, #d8d8d8 25%, transparent 25%),
    linear-gradient(-45deg, #d8d8d8 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #d8d8d8 75%),
    linear-gradient(-45deg, transparent 75%, #d8d8d8 75%);
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
  background-size: 20px 20px;
  box-shadow: var(--shadow);
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
}

.canvas-stage.white-preview {
  background-color: #fff;
  background-image: none;
}

#editorCanvas,
#overlayCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

#overlayCanvas {
  pointer-events: none;
}

.empty-state {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 8px;
  padding: 24px;
  text-align: center;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.58);
}

.empty-state strong {
  color: var(--ink);
  font-size: 24px;
}

.color-preview {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 8px;
}

#colorSwatch {
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #5a2f1f;
}

#hexColor,
.number-grid input {
  width: 100%;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0 10px;
  background: #fff;
}

.color-map {
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: crosshair;
}

.number-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.check-row {
  display: flex !important;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 8px !important;
  color: var(--ink) !important;
}

.check-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.primary,
#downloadButton {
  border-color: var(--accent);
  color: #fff;
  background: var(--accent);
}

.primary:hover,
#downloadButton:hover {
  background: var(--accent-strong);
}

.info-list {
  display: grid;
  gap: 8px;
  padding: 10px;
  border-left: 4px solid var(--gold);
  background: #fff8e9;
  border-radius: 6px;
}

.sr-only {
  position: absolute;
  overflow: hidden;
  width: 1px;
  height: 1px;
  clip: rect(0, 0, 0, 0);
}

@media (pointer: coarse) {
  button,
  #hexColor,
  .number-grid input {
    min-height: 46px;
  }

  .icon-button {
    width: 46px;
  }

  .segmented,
  .button-grid {
    gap: 10px;
  }
}

@media (max-width: 1180px) {
  .app-shell {
    grid-template-columns: minmax(240px, 300px) minmax(0, 1fr);
  }

  .color-panel {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(220px, 0.9fr);
    align-items: start;
  }

  .panel {
    max-height: none;
  }

  .canvas-stage {
    min-height: 62vh;
  }
}

@media (max-width: 820px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .color-panel {
    display: flex;
  }
}

@media (max-width: 560px) {
  .app-shell {
    padding: 10px;
    gap: 10px;
  }

  .topbar,
  .top-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .top-actions {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .view-switch {
    grid-column: 1 / -1;
  }
}

@media (orientation: landscape) and (pointer: coarse) and (min-width: 821px) {
  body {
    overflow: hidden;
  }

  .app-shell {
    grid-template-columns: 218px minmax(0, 1fr) 238px;
    gap: 8px;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    padding: max(8px, env(safe-area-inset-top)) max(8px, env(safe-area-inset-right)) max(8px, env(safe-area-inset-bottom)) max(8px, env(safe-area-inset-left));
  }

  .panel {
    min-height: 0;
    max-height: calc(100dvh - 16px);
    box-shadow: none;
  }

  .tools-panel,
  .color-panel {
    gap: 9px;
    padding: 10px;
  }

  .color-panel {
    grid-column: auto;
    display: flex;
  }

  .brand {
    align-items: center;
  }

  .brand p,
  .info-list {
    display: none;
  }

  h1 {
    font-size: 17px;
  }

  .tool-group {
    gap: 7px;
  }

  .segmented {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .button-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
  }

  button,
  #hexColor,
  .number-grid input {
    min-height: 36px;
  }

  .file-picker {
    min-height: 40px;
  }

  .tool-group label {
    gap: 2px;
    font-size: 12px;
  }

  input[type="range"] {
    min-height: 24px;
  }

  .topbar {
    padding: 8px;
    gap: 8px;
  }

  .status span {
    display: none;
  }

  .status strong {
    font-size: 13px;
  }

  .top-actions {
    gap: 6px;
  }

  .view-switch {
    gap: 2px;
    padding: 2px;
  }

  .view-switch button {
    min-height: 32px;
    padding: 0 7px;
  }

  .icon-button {
    width: 36px;
  }

  .canvas-stage {
    min-height: 0;
    height: 100%;
  }

  .color-preview {
    grid-template-columns: 40px minmax(0, 1fr);
  }

  .color-map {
    height: 96px;
  }

  .number-grid {
    gap: 6px;
  }

  .check-row input {
    width: 16px;
    height: 16px;
  }
}