:root {
  --bg: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --line: #d6d6de;
  --soft: #f5f5fb;
  --panel: rgba(255, 255, 255, 0.86);
  --header: rgba(250, 250, 252, 0.86);
  --blue: #0071e3;
  --green: #34c759;
  --shadow: 0 16px 48px rgba(0, 0, 0, 0.06);
  --ink: #111113;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 16% 0%, rgba(139, 215, 255, 0.32), transparent 32%),
    linear-gradient(180deg, #fff 0%, var(--soft) 100%);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--header);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  width: min(100% - 40px, 1280px);
  min-height: 78px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: 24px;
  line-height: 1.08;
  font-weight: 760;
}

h2 {
  font-size: 34px;
  line-height: 1.15;
  font-weight: 680;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.primary-button,
.secondary-button,
.text-button,
.frame-button,
.language-toggle button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  border-radius: 999px;
  white-space: nowrap;
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.primary-button {
  border: 0;
  padding: 8px 18px;
  color: #fff;
  background: var(--blue);
  font-weight: 650;
}

.secondary-button {
  border: 1px solid var(--line);
  padding: 8px 18px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.88);
}

.language-toggle {
  display: inline-flex;
  align-items: center;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
}

.language-toggle button {
  min-height: 32px;
  padding: 6px 12px;
  border: 0;
  color: var(--muted);
  background: transparent;
  font-size: 13px;
  font-weight: 650;
}

.language-toggle button.active {
  color: #fff;
  background: var(--ink);
}

.text-button {
  min-height: 30px;
  padding: 5px 10px;
  border: 0;
  color: var(--blue);
  background: transparent;
  font-size: 13px;
  font-weight: 650;
}

.primary-button:hover,
.secondary-button:hover,
.frame-button:hover {
  transform: translateY(-1px);
}

.workspace {
  width: min(100% - 40px, 1280px);
  margin: 24px auto 36px;
  display: grid;
  grid-template-columns: 330px minmax(0, 1fr);
  gap: 24px;
}

.control-panel,
.preview-area {
  min-width: 0;
}

.control-panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.control-section {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 16px;
  backdrop-filter: blur(18px);
}

.section-heading,
.stage-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.section-heading {
  margin-bottom: 14px;
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
}

output,
.stage-meta,
.range-label span,
.toggle-row {
  color: var(--muted);
  font-size: 13px;
}

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

.segmented button,
.frame-button {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.84);
  color: var(--text);
  min-width: 0;
  padding: 8px 12px;
  font-size: 13px;
}

.segmented button.active,
.frame-button.active {
  color: #fff;
  border-color: var(--blue);
  background: var(--blue);
}

.range-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin: 0 0 15px;
}

.range-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.range-label output {
  min-width: 38px;
  padding: 3px 8px;
  border-radius: 999px;
  color: var(--text);
  background: color-mix(in srgb, var(--blue) 8%, rgba(255, 255, 255, 0.86));
  border: 1px solid color-mix(in srgb, var(--blue) 18%, var(--line));
  font-size: 12px;
  font-weight: 700;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.range-row:last-child {
  margin-bottom: 0;
}

input[type="range"] {
  width: 100%;
  height: 24px;
  appearance: none;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--blue) 0%, var(--blue) 50%, #e8e8ef 50%, #e8e8ef 100%);
  outline: none;
  transition: filter 120ms ease;
}

input[type="range"]:focus-visible {
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--blue) 22%, transparent);
}

input[type="range"]:active {
  filter: saturate(1.08);
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 8px;
  border-radius: 999px;
  background: transparent;
}

input[type="range"]::-webkit-slider-thumb {
  width: 22px;
  height: 22px;
  margin-top: -7px;
  appearance: none;
  border-radius: 50%;
  background:
    radial-gradient(circle at 32% 30%, #fff, rgba(255, 255, 255, 0.84) 46%, rgba(246, 247, 252, 0.92));
  border: 1px solid rgba(0, 0, 0, 0.12);
  box-shadow: 0 5px 14px rgba(0, 0, 0, 0.18), inset 0 1px 0 rgba(255, 255, 255, 0.85);
}

input[type="range"]::-moz-range-track {
  height: 8px;
  border-radius: 999px;
  background: transparent;
}

input[type="range"]::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 32% 30%, #fff, rgba(255, 255, 255, 0.84) 46%, rgba(246, 247, 252, 0.92));
  border: 1px solid rgba(0, 0, 0, 0.12);
  box-shadow: 0 5px 14px rgba(0, 0, 0, 0.18), inset 0 1px 0 rgba(255, 255, 255, 0.85);
}

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

.toggle-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
}

.full-width {
  width: 100%;
}

.candidate-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.candidate {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 6px;
  background: rgba(255, 255, 255, 0.82);
}

.candidate.active {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--blue) 15%, transparent);
}

.candidate canvas {
  width: 100%;
  aspect-ratio: 1;
  display: block;
  border-radius: 8px;
  background: var(--soft);
}

.candidate span {
  display: block;
  padding-top: 5px;
  color: var(--muted);
  font-size: 11px;
}

.preview-area {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.stage-toolbar {
  min-height: 64px;
}

.stage-meta {
  display: flex;
  align-items: flex-end;
  flex-direction: column;
  gap: 6px;
  text-align: right;
}

.canvas-shell {
  position: relative;
  min-height: 620px;
  display: grid;
  place-items: center;
  padding: 20px;
  border: 1px solid transparent;
  border-radius: 22px;
  background:
    linear-gradient(rgba(255, 255, 255, 0.74), rgba(255, 255, 255, 0.74)) padding-box,
    linear-gradient(90deg, rgba(100, 210, 255, 0.8), rgba(141, 101, 255, 0.45), rgba(255, 143, 199, 0.85)) border-box;
  box-shadow: var(--shadow);
  overflow: hidden;
}

#artCanvas {
  display: block;
  max-width: 100%;
  max-height: min(70vh, 760px);
  width: auto;
  height: auto;
  border-radius: 16px;
  box-shadow: 0 22px 70px rgba(0, 0, 0, 0.12);
  background: #e9eef8;
}

.reference-strip {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
}

.reference-strip img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--soft);
}

@media (max-width: 980px) {
  .workspace {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 680px) {
  .header-inner,
  .workspace {
    width: min(100% - 24px, 1280px);
  }

  .header-inner,
  .stage-toolbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .control-panel,
  .reference-strip {
    grid-template-columns: 1fr;
  }

  .canvas-shell {
    min-height: 420px;
    padding: 12px;
  }
}