:root {
  --pp-canvas: #FFFFFF;
  --pp-ink: #000000;
  --pp-surface-soft: #F5F5F4;
  --pp-hairline: #E6E4DF;
  --pp-hairline-soft: #EFEDE8;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  height: 100vh;
  overflow: hidden;
  background: var(--pp-canvas);
  color: var(--pp-ink);
  font-family: 'Google Sans', system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.pp-chrome-header {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  padding: 0 32px;
  background: var(--pp-canvas);
  border-bottom: 1px solid var(--pp-hairline-soft);
  gap: 24px;
}

.pp-brand {
  font-weight: 540;
  font-size: 22px;
  line-height: 1;
  letter-spacing: -0.018em;
  color: var(--pp-ink);
  text-decoration: none;
}

.pp-design-bar {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  align-items: center;
  gap: 8px;
}

.pp-design-btn {
  padding: 7px 16px;
  border: 1px solid var(--pp-hairline);
  border-radius: 100px;
  background: var(--pp-canvas);
  color: var(--pp-ink);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: -0.005em;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.pp-design-btn:hover { border-color: var(--pp-ink); }
.pp-design-btn.active {
  background: var(--pp-ink);
  color: var(--pp-canvas);
  border-color: var(--pp-ink);
}

.pp-stamp {
  background: rgba(0, 0, 0, 0.85);
  color: var(--pp-canvas);
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 9999px;
  white-space: nowrap;
}

.pp-frame {
  width: 100%;
  height: calc(100vh - 64px);
  background: var(--pp-surface-soft);
}

.pp-frame iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}

@media (max-width: 768px) {
  html, body { overflow: auto; height: auto; }
  .pp-chrome-header {
    flex-direction: column;
    align-items: stretch;
    height: auto;
    padding: 16px 20px;
    gap: 12px;
  }
  .pp-design-bar {
    position: static;
    transform: none;
    justify-content: center;
    flex-wrap: wrap;
  }
  .pp-stamp { align-self: flex-end; }
  .pp-frame { height: calc(100vh - 180px); }
}