:root {
  --bg: #f4f1ea;
  --panel: #fffdf8;
  --border: #d9d2c4;
  --text: #2f2a24;
  --muted: #6f665c;
  --shadow: 0 10px 28px rgba(0, 0, 0, 0.08);
  --radius: 14px;
  --font-ui: "Avenir Next", Avenir, Aptos, "Helvetica Neue", Helvetica, Arial, sans-serif;
  --accent: #9b7a4a;
  --accent-soft: #efe4d0;
}

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

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  font-family: var(--font-ui);
  color: var(--text);
  background: var(--bg);
}

body {
  padding: 24px;
}

.app-shell {
  max-width: 1440px;
  margin: 0 auto;
}

.app-header {
  margin-bottom: 16px;
}

.app-header h1 {
  margin: 0;
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
}

.app-subtitle {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  letter-spacing: 0.01em;
}

.app-main {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  min-height: calc(100vh - 120px);
}

.control-panel,
.canvas-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.control-panel {
  padding: 14px 14px 16px;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
}

.panel-section + .panel-section {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.panel-section h2 {
  margin: 0 0 10px;
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text);
}

.panel-section h3 {
  margin: 0;
  font-size: 0.86rem;
  color: var(--text);
}

.workflow-stage {
  padding-top: 10px;
}

.stage-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0;
  border: 0;
  background: transparent;
  border-radius: 0;
}

.stage-toggle:hover {
  background: transparent;
  border-color: transparent;
}

.stage-toggle-label {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text);
}

.stage-toggle-value {
  font-size: 0.84rem;
  color: var(--muted);
}

.stage-toggle.is-active .stage-toggle-label {
  color: var(--text);
}

.stage-toggle.is-active .stage-toggle-value {
  color: var(--accent);
}

.stage-body {
  margin-top: 10px;
}

.stage-body.is-hidden {
  display: none;
}

.compact-section h2 {
  margin-bottom: 9px;
}

.file-label,
.field label {
  display: inline-block;
  margin-bottom: 6px;
  font-weight: 600;
}

.reference-section .file-label {
  font-size: 1.02rem;
}

.reference-upload-block.is-hidden,
#referenceUploadBlock.is-hidden {
  display: none;
}

.reference-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border: 1px solid rgba(217, 210, 196, 0.9);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.78);
}

.reference-summary.is-hidden {
  display: none;
}

.reference-summary-label {
  margin: 0;
  font-size: 0.74rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.reference-summary-name {
  margin: 4px 0 0;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
}

input[type="file"],
input[type="number"],
input[type="range"],
select {
  display: block;
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  font: inherit;
}

input[type="file"] {
  padding: 6px;
}

input[type="file"]::file-selector-button {
  margin-right: 10px;
  padding: 9px 12px;
  border: 1px solid #c8bca9;
  border-radius: 8px;
  background: linear-gradient(180deg, #fffdf8 0%, #f4ebdd 100%);
  color: var(--text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

input[type="range"] {
  padding: 0;
}

.helper-text {
  margin: 8px 0 0;
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.42;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}

.checkbox-row input {
  width: auto;
  margin: 0;
}

.inline-checkbox {
  gap: 8px;
}

.grid-row-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.view-mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 10px;
}

.view-mode-grid--single {
  grid-template-columns: 1fr;
}

.view-mode-button {
  padding: 9px 12px;
  font-size: 0.95rem;
  border-radius: 12px;
  text-align: left;
}

.view-mode-button.is-active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: #4e3a1f;
  box-shadow:
    inset 3px 0 0 #9b7a4a,
    inset 0 0 0 1px rgba(155, 122, 74, 0.16);
}

.mode-detail {
  margin-top: 6px;
  padding: 10px 10px 0;
  border: 1px solid rgba(217, 210, 196, 0.75);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.52);
}

.mode-detail.is-hidden {
  display: none;
}

.detail-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.detail-status-label {
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 700;
}

.preset-button-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 10px;
}

.control-cluster {
  margin-top: 2px;
  padding: 10px;
  border: 1px solid rgba(217, 210, 196, 0.78);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.58);
}

[data-stage-section="baseline"] {
  --stage-soft: rgba(241, 233, 215, 0.62);
  --stage-border: rgba(179, 143, 87, 0.34);
}

[data-stage-section="composition"] {
  --stage-soft: rgba(246, 229, 220, 0.68);
  --stage-border: rgba(196, 134, 95, 0.34);
}

[data-stage-section="drawing"] {
  --stage-soft: rgba(233, 240, 229, 0.72);
  --stage-border: rgba(123, 143, 118, 0.32);
}

[data-stage-section="painting"] {
  --stage-soft: rgba(232, 239, 247, 0.78);
  --stage-border: rgba(111, 137, 166, 0.32);
}

[data-stage-section="general"] {
  --stage-soft: rgba(242, 237, 229, 0.7);
  --stage-border: rgba(140, 125, 99, 0.28);
}

.workflow-stage.is-active .stage-toggle {
  padding: 6px 8px;
  border: 1px solid var(--stage-border);
  border-radius: 12px;
  background: var(--stage-soft);
}

.workflow-stage.is-active .stage-body {
  margin-top: 10px;
}

.info-list {
  margin: 0;
}

.compact-info-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px 16px;
}

.compact-info-list div {
  min-width: 0;
}

.info-list dt {
  font-size: 0.74rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.info-list dd {
  margin: 4px 0 0;
  font-weight: 600;
  line-height: 1.25;
}

button {
  display: inline-block;
  width: 100%;
  padding: 10px 13px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #ffffff;
  color: var(--text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

button:hover {
  background: #f8f4ec;
  border-color: #cbbfae;
}

button.stage-toggle {
  width: 100%;
  padding: 2px 0;
  border: 0;
  background: transparent;
  border-radius: 0;
  box-shadow: none;
}

button.stage-toggle:hover {
  background: transparent;
  border-color: transparent;
}

button:disabled {
  opacity: 0.58;
  cursor: not-allowed;
}

button:disabled:hover {
  background: #ffffff;
  border-color: var(--border);
}

.secondary-button {
  width: auto;
  min-width: 118px;
  padding: 9px 12px;
  background: linear-gradient(180deg, #fffdf8 0%, #f3eee4 100%);
}

.secondary-button--small {
  min-width: 0;
  padding: 7px 10px;
  font-size: 0.82rem;
}

.outline-preset-button.is-active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: #4e3a1f;
}

.export-actions {
  display: grid;
  gap: 8px;
}

.slider-value {
  margin: 6px 0 0;
  font-size: 0.82rem;
  color: var(--muted);
  font-weight: 600;
}

.canvas-panel {
  padding: 16px;
  min-width: 0;
}

.canvas-stage {
  position: relative;
  width: 100%;
  min-height: 640px;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    linear-gradient(45deg, #f1ebdf 25%, transparent 25%),
    linear-gradient(-45deg, #f1ebdf 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #f1ebdf 75%),
    linear-gradient(-45deg, transparent 75%, #f1ebdf 75%);
  background-size: 24px 24px;
  background-position: 0 0, 0 12px, 12px -12px, -12px 0;
  border: 1px solid rgba(217, 210, 196, 0.92);
  border-radius: 12px;
  overflow: auto;
}

#mainCanvas {
  display: block;
  background: #ffffff;
  border-radius: 8px;
  box-shadow: 0 4px 14px rgba(44, 34, 20, 0.08);
  max-width: 100%;
  height: auto;
}

.canvas-placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  pointer-events: none;
}

.canvas-placeholder.is-hidden {
  display: none;
}

.placeholder-card {
  min-width: 240px;
  min-height: 120px;
  padding: 24px;
  border-radius: 12px;
  background: rgba(255, 253, 248, 0.96);
  box-shadow: var(--shadow);
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--muted);
  font-size: 1rem;
}

@media (max-width: 980px) {
  body {
    padding: 16px;
  }

  .app-main {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .control-panel {
    max-height: none;
    overflow: visible;
  }

  .canvas-stage {
    min-height: 420px;
  }
}

@media (max-width: 640px) {
  .form-grid,
  .compact-info-list,
  .view-mode-grid {
    grid-template-columns: 1fr;
  }
}