:root {
  --ink: #2b2320;
  --muted: #9c8b84;
  --accent: #ff5a3c;
  --card: rgba(255, 255, 255, 0.72);
  --line: rgba(43, 35, 32, 0.09);
  --shadow: 0 18px 40px rgba(255, 90, 60, 0.16), 0 2px 10px rgba(43, 35, 32, 0.06);
  --font: ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  overflow: hidden;
  color: var(--ink);
  font-family: var(--font);
  background:
    radial-gradient(1200px 820px at 12% 6%, #fffdfb 0%, rgba(255, 253, 251, 0) 62%),
    radial-gradient(1000px 760px at 88% 96%, #ffe6de 0%, rgba(255, 230, 222, 0) 62%),
    linear-gradient(158deg, #fff8f4 0%, #ffefe7 48%, #fde6ea 100%);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  touch-action: none;
}

/* 背景点阵 */
.grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(255, 90, 60, 0.14) 1.1px, transparent 1.1px);
  background-size: 26px 26px;
  mask-image: radial-gradient(circle at 50% 45%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(circle at 50% 45%, #000 0%, transparent 78%);
  opacity: 0.7;
}

/* 柔光 */
.glow {
  position: fixed;
  inset: -20%;
  pointer-events: none;
  background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.85) 0%, rgba(255, 255, 255, 0) 55%);
  mix-blend-mode: soft-light;
}

#stage {
  position: fixed;
  inset: 0;
  display: block;
  z-index: 2;
}

/* ---------- 顶部标题 ---------- */
.hud {
  position: fixed;
  top: clamp(18px, 4vw, 42px);
  left: clamp(18px, 4vw, 48px);
  z-index: 5;
  pointer-events: none;
}

.hud h1 {
  margin: 0;
  font-size: clamp(22px, 3.4vw, 34px);
  font-weight: 800;
  letter-spacing: 0.01em;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.hud h1 span {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

.hud p {
  margin: 8px 0 0;
  font-size: clamp(13px, 1.5vw, 15px);
  color: var(--muted);
}

/* ---------- 底部提示 ---------- */
.hint {
  position: fixed;
  left: 50%;
  bottom: clamp(20px, 5vh, 46px);
  transform: translateX(-50%);
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 11px 20px;
  border-radius: 999px;
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px) saturate(1.4);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  font-size: 13.5px;
  color: #6b5d57;
  white-space: nowrap;
  transition: opacity 0.5s ease, transform 0.5s ease;
  pointer-events: none;
  animation: floaty 3.4s ease-in-out infinite;
}

.hint svg { color: var(--accent); flex: none; }

.hint.is-hidden {
  opacity: 0;
  transform: translateX(-50%) translateY(14px);
}

@keyframes floaty {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-5px); }
}

/* ---------- 设置面板 ---------- */
.panel {
  position: fixed;
  right: clamp(14px, 3vw, 34px);
  bottom: clamp(14px, 3vw, 34px);
  z-index: 6;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
}

.panel-toggle {
  width: 46px;
  height: 46px;
  border-radius: 15px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px) saturate(1.4);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: transform 0.2s ease, background 0.2s ease;
}

.panel-toggle:hover { transform: translateY(-2px); }
.panel-toggle:active { transform: translateY(0) scale(0.96); }

.panel-body {
  width: 232px;
  padding: 16px 16px 14px;
  border-radius: 18px;
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px) saturate(1.5);
  -webkit-backdrop-filter: blur(18px) saturate(1.5);
  transform-origin: bottom right;
  transition: opacity 0.24s ease, transform 0.24s ease;
  opacity: 0;
  transform: translateY(10px) scale(0.96);
  pointer-events: none;
}

.panel.is-open .panel-body {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.panel-body h2 {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
}

.ctl {
  display: block;
  margin-bottom: 13px;
  font-size: 13px;
  color: #5f524c;
}

.ctl span { display: block; margin-bottom: 7px; }

.ctl-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.ctl-row span { margin: 0; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 90, 60, 0.16);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--accent);
  box-shadow: 0 2px 8px rgba(255, 90, 60, 0.35);
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--accent);
  cursor: pointer;
}

input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 42px;
  height: 24px;
  border-radius: 999px;
  background: rgba(43, 35, 32, 0.14);
  position: relative;
  cursor: pointer;
  transition: background 0.2s ease;
  flex: none;
}

input[type="checkbox"]::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s ease;
}

input[type="checkbox"]:checked { background: var(--accent); }
input[type="checkbox"]:checked::after { transform: translateX(18px); }

/* ---------- 加载层 ---------- */
.loader {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 18px;
  background: rgba(255, 248, 244, 0.9);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader.is-hidden {
  opacity: 0;
  visibility: hidden;
}

.loader-ring {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 4px solid rgba(255, 90, 60, 0.18);
  border-top-color: var(--accent);
  animation: spin 0.9s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loader-bar {
  width: 210px;
  height: 7px;
  border-radius: 999px;
  background: rgba(255, 90, 60, 0.14);
  overflow: hidden;
}

.loader-bar i {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, #ff8a6a, var(--accent));
  transition: width 0.2s ease;
}

.loader-text {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

@media (max-width: 560px) {
  .hint span { white-space: normal; }
  .hint { max-width: 84vw; text-align: center; }
  .panel-body { width: 208px; }
}