/* ------------------------------------------------------------------ tokens */

:root {
  color-scheme: light;

  --bg: #f6f4f1;
  --bg-elevated: #ffffff;
  --bg-sunken: #ece8e3;
  --border: #ddd6cd;
  --border-strong: #c8bfb3;
  --text: #241f1b;
  --text-muted: #6d635a;
  --accent: #b06033;
  --accent-strong: #8f4a24;
  --accent-soft: #f2e2d6;
  --accent-contrast: #ffffff;
  --warning-bg: #fdf1dc;
  --warning-border: #e5c184;
  --warning-text: #7a5314;
  --shadow: 0 1px 2px rgba(36, 31, 27, .06), 0 8px 24px -12px rgba(36, 31, 27, .22);
  --radius: 14px;
  --radius-sm: 9px;
  --focus: 0 0 0 3px rgba(176, 96, 51, .32);
}

:root[data-theme="dark"] {
  color-scheme: dark;

  --bg: #16130f;
  --bg-elevated: #201c17;
  --bg-sunken: #100e0b;
  --border: #342e26;
  --border-strong: #4a4136;
  --text: #f0e9e0;
  --text-muted: #a99d8e;
  --accent: #e08c52;
  --accent-strong: #f0a670;
  --accent-soft: #33251a;
  --accent-contrast: #1a1310;
  --warning-bg: #2e2415;
  --warning-border: #5e4a25;
  --warning-text: #e6c98d;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 10px 28px -14px rgba(0, 0, 0, .8);
  --focus: 0 0 0 3px rgba(224, 140, 82, .35);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;

    --bg: #16130f;
    --bg-elevated: #201c17;
    --bg-sunken: #100e0b;
    --border: #342e26;
    --border-strong: #4a4136;
    --text: #f0e9e0;
    --text-muted: #a99d8e;
    --accent: #e08c52;
    --accent-strong: #f0a670;
    --accent-soft: #33251a;
    --accent-contrast: #1a1310;
    --warning-bg: #2e2415;
    --warning-border: #5e4a25;
    --warning-text: #e6c98d;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 10px 28px -14px rgba(0, 0, 0, .8);
    --focus: 0 0 0 3px rgba(224, 140, 82, .35);
  }
}

/* ------------------------------------------------------------------- reset */

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, p, dl, dd, figure { margin: 0; }
button, input, select, textarea { font: inherit; color: inherit; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--accent-strong); }

:focus-visible { outline: none; box-shadow: var(--focus); border-radius: var(--radius-sm); }

/* Class rules such as .button-row { display: flex } outrank the user-agent
   [hidden] rule, so state it explicitly. */
.hidden, [hidden] { display: none !important; }

/* ------------------------------------------------------------------ topbar */

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px clamp(16px, 4vw, 40px);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 620;
  letter-spacing: -.01em;
  text-decoration: none;
}
.brand-mark { width: 26px; height: 26px; color: var(--accent); }

.brand-credit {
  margin-right: auto;
  align-self: center;
  font-size: 11px;
  line-height: 1.4;
  color: var(--text-muted);
}

.topbar-actions { display: flex; align-items: center; gap: 14px; }
.link { font-size: 14px; }

.icon-button {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-elevated);
  color: var(--text-muted);
  cursor: pointer;
  transition: color .15s, border-color .15s;
}
.icon-button:hover { color: var(--accent); border-color: var(--border-strong); }
.icon-button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.icon-moon { display: none; }
:root[data-theme="dark"] .icon-sun { display: none; }
:root[data-theme="dark"] .icon-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun { display: none; }
  :root:not([data-theme="light"]) .icon-moon { display: block; }
}

/* ------------------------------------------------------------------ layout */

.layout {
  max-width: 1240px;
  margin: 0 auto;
  padding: clamp(24px, 4vw, 44px) clamp(16px, 4vw, 40px) 72px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.intro { max-width: 62ch; }
.intro h1 {
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.15;
  letter-spacing: -.025em;
  margin-bottom: 10px;
}
.intro p { color: var(--text-muted); }

.columns {
  display: grid;
  grid-template-columns: minmax(0, 400px) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}
.column { display: flex; flex-direction: column; gap: 24px; min-width: 0; }
.column-preview { position: sticky; top: 76px; }

@media (max-width: 940px) {
  .columns { grid-template-columns: minmax(0, 1fr); }
  .column-preview { position: static; }
}

@media (max-width: 640px) {
  .brand-credit { display: none; }
}

/* ------------------------------------------------------------------- cards */

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(16px, 2.4vw, 24px);
}

.card-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 620;
  letter-spacing: .01em;
  margin-bottom: 16px;
}

.step-badge {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 12px;
  font-weight: 700;
}

.note {
  margin-top: 12px;
  color: var(--text-muted);
  font-size: 13.5px;
}

/* ---------------------------------------------------------------- dropzone */

.dropzone {
  display: grid;
  place-items: center;
  gap: 2px;
  padding: 28px 16px;
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-sunken);
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.dropzone:hover, .dropzone.dragover {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.dropzone-icon {
  width: 30px;
  height: 30px;
  margin-bottom: 6px;
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.dropzone-title { font-weight: 560; }
.dropzone-hint { color: var(--text-muted); font-size: 13px; }

/* ------------------------------------------------------------------ fields */

.field { margin-bottom: 16px; }
.field > label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 7px;
  font-size: 13.5px;
  font-weight: 560;
}
.field-help { color: var(--text-muted); font-weight: 400; font-size: 12.5px; }

.slider-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 82px;
  align-items: center;
  gap: 12px;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 22px;
  background: transparent;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 5px;
  border-radius: 3px;
  background: var(--bg-sunken);
  border: 1px solid var(--border);
}
input[type="range"]::-moz-range-track {
  height: 5px;
  border-radius: 3px;
  background: var(--bg-sunken);
  border: 1px solid var(--border);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 17px;
  height: 17px;
  margin-top: -7px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-elevated);
  box-shadow: 0 1px 3px rgba(0, 0, 0, .3);
}
input[type="range"]::-moz-range-thumb {
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-elevated);
  box-shadow: 0 1px 3px rgba(0, 0, 0, .3);
}

.number, .select, .textarea {
  width: 100%;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-sunken);
  transition: border-color .15s;
}
.number { text-align: right; font-variant-numeric: tabular-nums; }
.number.wide { max-width: 140px; text-align: left; }
.number:hover, .select:hover, .textarea:hover { border-color: var(--border-strong); }

.textarea {
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  line-height: 1.5;
  text-align: left;
  word-break: break-all;
}

.advanced {
  margin: 4px 0 16px;
  border-top: 1px solid var(--border);
  padding-top: 12px;
}
.advanced > summary {
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 560;
  color: var(--text-muted);
  margin-bottom: 14px;
  list-style: none;
}
.advanced > summary::-webkit-details-marker { display: none; }
.advanced > summary::before { content: "\25B8"; display: inline-block; margin-right: 7px; transition: transform .15s; }
.advanced[open] > summary::before { transform: rotate(90deg); }
.advanced > summary:hover { color: var(--accent); }

.inline-field { display: inline-flex; align-items: center; gap: 8px; }
.inline-field .number { width: 92px; }

/* ----------------------------------------------------------------- palette */

.field > .checkbox-field {
  display: flex;
  /* .field > label spreads its children apart; a checkbox and its text belong
     together, so override that here — and match its specificity to win. */
  justify-content: flex-start;
  align-items: flex-start;
  gap: 9px;
  margin-bottom: 0;
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 560;
}
.checkbox-field input[type="checkbox"] {
  width: 16px;
  height: 16px;
  margin-top: 2px;
  accent-color: var(--accent);
  flex: none;
}
.checkbox-field .field-help { display: block; font-weight: 400; margin-top: 2px; }

.palette {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 10px;
}
.swatch {
  width: 38px;
  height: 34px;
  padding: 2px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-sunken);
  cursor: pointer;
}
.swatch:hover { border-color: var(--accent); }
.swatch::-webkit-color-swatch-wrapper { padding: 0; }
.swatch::-webkit-color-swatch { border: none; border-radius: 3px; }
.swatch::-moz-color-swatch { border: none; border-radius: 3px; }

.palette-legend {
  list-style: none;
  margin: 4px 0 16px;
  display: grid;
  gap: 6px;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
}
.palette-legend li { display: flex; align-items: center; gap: 8px; }
.swatch-dot {
  width: 13px;
  height: 13px;
  border-radius: 3px;
  border: 1px solid var(--border-strong);
  flex: none;
}

/* ----------------------------------------------------------------- buttons */

.button-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}
.button-row + .button-row { margin-top: 10px; }

.button {
  padding: 8px 15px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  font-size: 14px;
  font-weight: 560;
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s, transform .05s;
}
.button:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.button:active:not(:disabled) { transform: translateY(1px); }
.button:disabled { opacity: .45; cursor: not-allowed; }

.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
}
.button.primary:hover:not(:disabled) {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: var(--accent-contrast);
}

.button.ghost { background: transparent; border-color: var(--border); color: var(--text-muted); }
.button.ghost:hover:not(:disabled) { color: var(--accent); border-color: var(--accent); }
.button.small { padding: 4px 12px; font-size: 13px; }

.examples { margin-top: 12px; }

/* --------------------------------------------------------------- preview */

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 18px;
}
.preview { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.preview figcaption {
  color: var(--text-muted);
  font-size: 12.5px;
  text-align: center;
}

.canvas-frame {
  position: relative;
  aspect-ratio: 1;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-sunken);
  overflow: hidden;
}
.canvas-frame canvas {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: inherit;
}
.canvas-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--text-muted);
  font-size: 13px;
  pointer-events: none;
}

/* --------------------------------------------------------------- progress */

.progress { margin-top: 18px; }
.progress-track {
  height: 6px;
  border-radius: 3px;
  background: var(--bg-sunken);
  border: 1px solid var(--border);
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: inherit;
  transition: width .2s ease-out;
}
.progress-label {
  margin-top: 7px;
  color: var(--text-muted);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.status {
  margin-top: 12px;
  color: var(--text-muted);
  font-size: 13px;
}

.warning {
  margin-bottom: 14px;
  padding: 9px 12px;
  border: 1px solid var(--warning-border);
  border-radius: var(--radius-sm);
  background: var(--warning-bg);
  color: var(--warning-text);
  font-size: 13px;
}

/* ------------------------------------------------------------------ stats */

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}
.stats div {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-sunken);
}
.stats dt { color: var(--text-muted); font-size: 12px; }
.stats dd {
  margin-top: 2px;
  font-size: 18px;
  font-weight: 620;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

/* -------------------------------------------------------------- assistant */

.assistant-grid {
  display: grid;
  grid-template-columns: minmax(0, 330px) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}
@media (max-width: 780px) {
  .assistant-grid { grid-template-columns: minmax(0, 1fr); }
}
.assistant-stage { display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.assistant-stage .canvas-frame { max-width: 560px; margin: 0 auto; width: 100%; }

.step-readout {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  justify-content: center;
  font-variant-numeric: tabular-nums;
}
.step-readout strong { color: var(--accent); font-variant-numeric: tabular-nums; }
.step-pins { color: var(--text-muted); }
.step-controls { justify-content: center; }

kbd {
  padding: 1px 5px;
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--bg-sunken);
  font-family: inherit;
  font-size: 11.5px;
}

/* ----------------------------------------------------------------- footer */

.footer {
  border-top: 1px solid var(--border);
  padding: 22px clamp(16px, 4vw, 40px);
  color: var(--text-muted);
  font-size: 13px;
  text-align: center;
}

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}