* { margin: 0; padding: 0; box-sizing: border-box; }
body { background: #f5f5f7; overflow: hidden; font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', sans-serif; }
canvas { display: block; width: 100vw; height: 100vh; cursor: grab; touch-action: none; }
body.is-dragging canvas { cursor: grabbing; }

#ui {
  position: fixed; bottom: 32px; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  z-index: 10;
}
#ui .label {
  font-size: 15px; font-weight: 600; color: #1d1d1f; letter-spacing: -0.01em;
}
#ui .swatches {
  display: flex; gap: 16px; padding: 12px 24px;
  background: rgba(255,255,255,0.85); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-radius: 100px; box-shadow: 0 2px 20px rgba(0,0,0,0.08), 0 0 0 0.5px rgba(0,0,0,0.05);
}
.swatch {
  width: 28px; height: 28px; border-radius: 50%; cursor: pointer; border: none;
  outline: none; position: relative; transition: transform 0.2s ease;
}
.swatch:hover { transform: scale(1.15); }
.swatch::after {
  content: ''; position: absolute; inset: -4px; border-radius: 50%;
  border: 2px solid transparent; transition: border-color 0.2s ease;
}
.swatch.active::after { border-color: #1d1d1f; }

#view-btns {
  position: fixed; top: 24px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 6px; z-index: 10;
}
#view-btns button {
  padding: 6px 16px; border: none; cursor: pointer;
  background: rgba(255,255,255,0.85); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-radius: 100px; font-size: 12px; font-weight: 500;
  color: #1d1d1f; letter-spacing: -0.01em;
  box-shadow: 0 1px 8px rgba(0,0,0,0.06), 0 0 0 0.5px rgba(0,0,0,0.06);
  transition: background 0.2s, transform 0.15s; white-space: nowrap;
}
#view-btns button:hover { background: rgba(255,255,255,1); transform: scale(1.05); }
#view-btns button.active { background: #1d1d1f; color: #fff; }

#screen-upload {
  position: fixed; top: 24px; left: 24px; z-index: 10;
  display: flex; align-items: center; gap: 6px;
  max-width: min(360px, calc(100vw - 48px));
}
#screen-upload button {
  padding: 6px 14px; border: none; cursor: pointer;
  background: rgba(255,255,255,0.85); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-radius: 100px; font-size: 12px; font-weight: 500;
  color: #1d1d1f; letter-spacing: -0.01em; white-space: nowrap;
  box-shadow: 0 1px 8px rgba(0,0,0,0.06), 0 0 0 0.5px rgba(0,0,0,0.06);
  transition: background 0.2s, transform 0.15s;
}
#screen-upload button:hover { background: rgba(255,255,255,1); transform: scale(1.05); }
#screen-upload button[hidden] { display: none; }
#display-upload-info {
  min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  padding: 6px 10px; border-radius: 100px;
  background: rgba(255,255,255,0.78); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 8px rgba(0,0,0,0.06), 0 0 0 0.5px rgba(0,0,0,0.06);
  color: #6e6e73; font-size: 12px; font-weight: 500;
}
#display-upload-info:empty { display: none; }
#display-upload-input { display: none; }

#env-selector {
  position: fixed; top: 24px; right: 24px; z-index: 10;
}
#env-select {
  padding: 6px 28px 6px 12px;
  border: none; cursor: pointer;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-radius: 100px; font-size: 12px; font-weight: 500;
  color: #1d1d1f; letter-spacing: -0.01em;
  box-shadow: 0 1px 8px rgba(0,0,0,0.06), 0 0 0 0.5px rgba(0,0,0,0.06);
  appearance: none; -webkit-appearance: none;
  background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2212%22%20height%3D%2212%22%20viewBox%3D%220%200%2012%2012%22%3E%3Cpath%20d%3D%22M3%204.5l3%203%203-3%22%20fill%3D%22none%22%20stroke%3D%22%231d1d1f%22%20stroke-width%3D%221.5%22%20stroke-linecap%3D%22round%22%20stroke-linejoin%3D%22round%22%2F%3E%3C%2Fsvg%3E');
  background-repeat: no-repeat; background-position: right 10px center;
}

/* Render settings panel (right side, below env selector) */
#settings-toggle {
  position: fixed; top: 24px; right: 200px; z-index: 11;
  padding: 6px 14px; border: none; cursor: pointer;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-radius: 100px; font-size: 12px; font-weight: 500;
  color: #1d1d1f; letter-spacing: -0.01em; white-space: nowrap;
  box-shadow: 0 1px 8px rgba(0,0,0,0.06), 0 0 0 0.5px rgba(0,0,0,0.06);
  transition: background 0.2s;
}
#settings-toggle:hover { background: rgba(255,255,255,1); }
#settings-toggle.active { background: #1d1d1f; color: #fff; }

#settings-panel {
  position: fixed; top: 70px; right: 24px; z-index: 10;
  width: 260px; max-height: calc(100vh - 100px); overflow-y: auto;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-radius: 18px; padding: 16px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.10), 0 0 0 0.5px rgba(0,0,0,0.06);
  font-size: 12px; color: #1d1d1f;
  display: none;
}
#settings-panel.open { display: block; }
#settings-panel .group { margin-bottom: 14px; }
#settings-panel .group:last-child { margin-bottom: 0; }
#settings-panel .group-title {
  font-size: 11px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.05em; color: #6e6e73; margin-bottom: 8px;
}
#settings-panel .row {
  display: flex; align-items: center; justify-content: space-between;
  gap: 8px; margin-bottom: 8px;
}
#settings-panel .row:last-child { margin-bottom: 0; }
#settings-panel label { font-weight: 500; flex: 1; }
#settings-panel label.switch { flex: 0 0 36px; }
#settings-panel .val { font-variant-numeric: tabular-nums; color: #6e6e73; min-width: 32px; text-align: right; }
#settings-panel input[type="range"] { flex: 1; min-width: 0; accent-color: #1d1d1f; }
#settings-panel select {
  padding: 4px 22px 4px 8px; border: 1px solid rgba(0,0,0,0.1); border-radius: 8px;
  background: #fff; font-size: 12px; color: #1d1d1f; cursor: pointer;
  appearance: none; -webkit-appearance: none;
  background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2210%22%20height%3D%2210%22%20viewBox%3D%220%200%2012%2012%22%3E%3Cpath%20d%3D%22M3%204.5l3%203%203-3%22%20fill%3D%22none%22%20stroke%3D%22%231d1d1f%22%20stroke-width%3D%221.5%22%20stroke-linecap%3D%22round%22%20stroke-linejoin%3D%22round%22%2F%3E%3C%2Fsvg%3E');
  background-repeat: no-repeat; background-position: right 6px center;
}
/* iOS-style toggle switch */
#settings-panel .switch {
  position: relative; width: 36px; height: 20px; flex-shrink: 0;
  display: inline-block;
}
#settings-panel .switch input { opacity: 0; width: 0; height: 0; }
#settings-panel .switch .slider {
  position: absolute; cursor: pointer; inset: 0;
  background: #d1d1d6; border-radius: 100px; transition: background 0.2s;
}
#settings-panel .switch .slider::before {
  content: ''; position: absolute; height: 16px; width: 16px;
  left: 2px; top: 2px; background: #fff; border-radius: 50%;
  transition: transform 0.2s; box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
#settings-panel .switch input:checked + .slider { background: #34c759; }
#settings-panel .switch input:checked + .slider::before { transform: translateX(16px); }
#settings-panel .reset {
  width: 100%; padding: 6px; border: none; cursor: pointer;
  background: rgba(0,0,0,0.05); border-radius: 8px;
  font-size: 12px; font-weight: 500; color: #1d1d1f;
  transition: background 0.2s;
}
#settings-panel .reset:hover { background: rgba(0,0,0,0.1); }

@media (max-width: 700px) {
  #view-btns {
    top: 12px;
    right: 12px;
    left: 12px;
    transform: none;
    justify-content: flex-start;
    overflow-x: auto;
    max-width: calc(100vw - 24px);
    padding-bottom: 4px;
  }

  #view-btns button {
    flex: 0 0 auto;
    padding: 6px 12px;
  }

  #settings-toggle {
    top: 92px;
    right: auto;
    left: 12px;
  }

  #screen-upload {
    top: 54px;
    right: 12px;
    left: 12px;
    max-width: calc(100vw - 24px);
    overflow: hidden;
  }

  #screen-upload button {
    flex: 0 0 auto;
    padding: 6px 12px;
  }

  #env-selector {
    top: 92px;
    right: 12px;
    max-width: calc(100vw - 112px);
  }

  #env-select {
    max-width: 100%;
  }

  #settings-panel {
    top: 132px;
    right: 12px;
    left: 12px;
    width: auto;
    max-height: calc(100vh - 150px);
    border-radius: 14px;
  }

  #ui {
    right: 12px;
    bottom: 24px;
    left: 12px;
    width: auto;
    transform: none;
  }
}