:root {
  --panel-bg: rgba(255, 255, 255, 0.82);
  --panel-border: rgba(0, 0, 0, 0.08);
  --text: #111;
  --muted: #6c6c70; /* iOS gray */
  --primary: #0A84FF; /* iOS blue */
  --primary-contrast: #fff;
  --shadow: 0 14px 34px rgba(0,0,0,0.16);
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, Segoe UI, Roboto, Helvetica, Arial;
  color: var(--text);
  background: #000; /* 实时预览用 */
  transition: background-color .18s ease;
}

#app {
  position: fixed;
  right: calc(20px + env(safe-area-inset-right));
  top: calc(20px + env(safe-area-inset-top));
  width: min(880px, calc(100% - 40px));
  background: var(--panel-bg);
  backdrop-filter: saturate(120%) blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  z-index: 10;
  opacity: 1;
  transform: translateY(0);
  transition: opacity .18s ease, transform .18s ease;
}

#app.is-hidden {
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
}

.panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--panel-border);
}

.panel__header h1 {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
}

.logo .accent {
  color: var(--primary);
}

.header__actions button {
  margin-left: 8px;
}

.panel__section {
  padding: 14px 16px 6px 16px;
}

.panel__section h2 {
  margin: 0 0 8px 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
}

	.controls {
	  display: flex;
	  gap: 10px;
	  flex-wrap: wrap;
	  align-items: flex-end;
	}

.controls--color {
  align-items: center;
}

.control {
  display: grid;
  grid-template-rows: auto auto;
  gap: 6px;
}

.control--grow { flex: 1 1 280px; }

label span {
  font-size: 12px;
  color: var(--muted);
}

input[type="text"], input[type="number"], select, input[readonly] {
  height: 44px; /* iOS touch target */
  padding: 6px 10px;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  background: #fff;
  outline: none;
  font-size: 14px;
}

input[type="color"] {
  appearance: none;
  width: 48px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  background: #fff;
}

button {
  height: 44px;
  padding: 0 14px;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
  transition: transform .06s ease, background-color .12s ease, box-shadow .12s ease, color .12s ease;
}

.btn--primary {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-contrast);
  box-shadow: 0 2px 6px rgba(10,132,255,.35);
}

button:active { transform: scale(0.98); }

.readouts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 10px;
}

.readout {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 8px;
  align-items: center;
}

.readout span {
  font-size: 12px;
  color: var(--muted);
}

#toast {
  position: fixed;
  left: calc(50% + env(safe-area-inset-left)/2 - env(safe-area-inset-right)/2);
  bottom: calc(20px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  background: rgba(0,0,0,0.85);
  color: #fff;
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
  z-index: 20;
}

#toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(-4px);
}

@media (max-width: 640px) {
  #app {
    left: calc(10px + env(safe-area-inset-left));
    right: calc(10px + env(safe-area-inset-right));
    width: auto;
  }
  .readouts { grid-template-columns: 1fr; }
}

.fab {
  position: fixed;
  left: calc(20px + env(safe-area-inset-left));
  bottom: calc(20px + env(safe-area-inset-bottom));
  height: 44px;
  padding: 0 14px;
  border-radius: 22px;
  border: 1px solid rgba(255,255,255,0.35);
  background: rgba(255,255,255,0.16); /* 高透明 */
  color: #111;
  backdrop-filter: saturate(120%) blur(20px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.18);
  z-index: 15;
}

/* 根据背景自适应的两种透明方案 */
.fab.fab--light { /* 背景较暗时，浅色磨砂 */
  background: rgba(255,255,255,0.18);
  border-color: rgba(255,255,255,0.45);
  color: #111;
}
.fab.fab--dark { /* 背景较亮时，深色磨砂 */
  background: rgba(0,0,0,0.25);
  border-color: rgba(255,255,255,0.25);
  color: #fff;
}

.segmented {
  display: inline-flex;
  background: #F2F2F7; /* iOS grouped background */
  border-radius: 12px;
  padding: 2px;
  border: 1px solid rgba(0,0,0,0.06);
}
.segmented > button {
  height: 36px;
  padding: 0 14px;
  border: 0;
  background: transparent;
  color: #111;
  border-radius: 10px;
}
.segmented > button[aria-selected="true"] {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 1px 3px rgba(10,132,255,.3);
}

.visually-hidden {
  position: absolute !important;
  height: 1px; width: 1px;
  overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px);
  white-space: nowrap;
  border: 0; padding: 0; margin: -1px;
}
.icon-btn {
  width: 44px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Recent chips */
.chips { display:flex; flex-wrap:wrap; gap:8px; margin-top:10px; }
.chip { height: 28px; line-height: 28px; padding: 0 10px; border-radius: 999px; border:1px solid var(--panel-border); background:#fff; font-size:12px; cursor:pointer; }
.chip:active { transform: scale(.98); }

/* Ensure header action buttons align and group correctly */
.header__actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Normalize range control height for better alignment in controls */
input[type="range"] {
  height: 44px;
  margin: 0;
  accent-color: var(--primary);
}