/* ── Reset ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Design tokens — light ──────────────────────────────── */
:root {
  --bg:           #fafafa;
  --bg-secondary: #ffffff;
  --bg-tertiary:  #f0f0f0;
  --text:         #171717;
  --text-muted:   #525252;
  --border:       #e5e5e5;
  --accent:       #b8860b;
  --accent-hover: #9a7209;
  --success:      #34d399;
  --radius:       0.5rem;
  --transition:   150ms cubic-bezier(.4,0,.2,1);
  --font-sans:    'Inter', ui-sans-serif, system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, monospace;
}

/* ── Base ───────────────────────────────────────────────── */
body {
  font-family: var(--font-sans);
  font-weight: 400;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* ── Header ─────────────────────────────────────────────── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 56px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
  position: sticky;
  top: 0;
  z-index: 10;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: -0.025em;
  color: var(--text);
  text-decoration: none;
}
.logo-mark {
  width: 24px;
  height: 24px;
  background: var(--accent);
  border-radius: 4px;
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.header-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ── Main layout ─────────────────────────────────────────── */
main {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 340px;
  overflow: hidden;
}

/* ── Canvas pane ─────────────────────────────────────────── */
.canvas-pane {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 3rem;
  background:
    radial-gradient(ellipse at 50% 40%, rgba(229,192,123,.04) 0%, transparent 65%),
    repeating-linear-gradient(
      0deg, transparent, transparent 39px,
      var(--border) 39px, var(--border) 40px
    ),
    repeating-linear-gradient(
      90deg, transparent, transparent 39px,
      var(--border) 39px, var(--border) 40px
    ),
    var(--bg);
}

#the-div {
  width: 200px;
  height: 200px;
  background-color: #7ba7e5;
  border-radius: 8px;
  box-shadow: 0 20px 60px rgba(123,167,229,.2), 0 4px 16px rgba(0,0,0,.5);
  transition:
    background-color var(--transition),
    border-radius var(--transition),
    box-shadow var(--transition),
    width var(--transition),
    height var(--transition);
  position: relative;
}
#the-div::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255,255,255,.08) 0%, transparent 55%);
  pointer-events: none;
}

.canvas-hint {
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ── Panel ───────────────────────────────────────────────── */
.panel {
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.panel-section {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
}
.panel-section:last-child { border-bottom: none; }

.section-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

/* ── Property rows ───────────────────────────────────────── */
.prop-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.prop-row:last-child { margin-bottom: 0; }

.prop-label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
}
.prop-value {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  min-width: 40px;
  text-align: right;
}

/* ── Color swatch ────────────────────────────────────────── */
.color-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.color-swatch {
  width: 28px;
  height: 28px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  transition: border-color var(--transition);
}
.color-swatch:hover { border-color: var(--text-muted); }
.color-swatch input[type="color"] {
  position: absolute;
  inset: -4px;
  opacity: 0;
  cursor: pointer;
  width: calc(100% + 8px);
  height: calc(100% + 8px);
}
.color-swatch-preview {
  width: 100%;
  height: 100%;
  background-color: #7ba7e5;
  pointer-events: none;
}

.hex-input {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.375rem 0.625rem;
  border-radius: var(--radius);
  width: 88px;
  transition: border-color var(--transition);
}
.hex-input:focus {
  outline: none;
  border-color: var(--accent);
}

/* ── Range slider ────────────────────────────────────────── */
.range-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 3px;
  border-radius: 99px;
  background: var(--bg-tertiary);
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-secondary);
  box-shadow: 0 0 0 1px var(--accent);
  transition: transform var(--transition), box-shadow var(--transition);
}
input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 0 0 3px rgba(229,192,123,.25);
}
input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-secondary);
  cursor: pointer;
}
.range-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.6875rem;
  color: var(--text-muted);
}

/* ── Size inputs ─────────────────────────────────────────── */
.size-inputs {
  display: flex;
  gap: 0.5rem;
}
.size-field {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.375rem 0.625rem;
  flex: 1;
  transition: border-color var(--transition);
}
.size-field:focus-within { border-color: var(--accent); }
.size-field label {
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--text-muted);
}
.size-field input {
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  width: 44px;
}
.size-unit {
  font-size: 0.6875rem;
  color: var(--text-muted);
}

/* ── Toggle ──────────────────────────────────────────────── */
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.toggle {
  position: relative;
  width: 36px;
  height: 20px;
  flex-shrink: 0;
}
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-track {
  position: absolute;
  inset: 0;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 99px;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}
.toggle-track::before {
  content: '';
  position: absolute;
  left: 3px;
  top: 3px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: transform var(--transition), background var(--transition);
}
.toggle input:checked + .toggle-track {
  background: var(--accent);
  border-color: var(--accent);
}
.toggle input:checked + .toggle-track::before {
  transform: translateX(16px);
  background: var(--bg);
}

/* ── CSS preview ─────────────────────────────────────────── */
.css-preview {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.75;
  color: var(--text-muted);
  white-space: pre;
  overflow-x: auto;
}
.css-prop { color: var(--text-muted); }
.css-val  { color: var(--accent); }
.css-semi { color: var(--border); }

/* ── Export button ───────────────────────────────────────── */
.btn-export {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.625rem 1.25rem;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}
.btn-export:hover  { background: var(--accent-hover); }
.btn-export:active { transform: scale(.99); }
.btn-export.copied {
  background: var(--success);
  color: #0a0a0a;
}
.btn-export svg { flex-shrink: 0; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 720px) {
  main {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }
  .canvas-pane { min-height: 280px; padding: 2rem 1.5rem; }
  .panel { border-left: none; border-top: 1px solid var(--border); }
}