:root {
  --panel-bg: rgba(18, 20, 28, 0.72);
  --panel-border: rgba(255, 255, 255, 0.12);
  --text: #eef1f8;
  --muted: #9aa3b6;
  --accent: #5aa9ff;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background-color: #0b0d12;
  background-image:
    linear-gradient(45deg, #15171e 25%, transparent 25%),
    linear-gradient(-45deg, #15171e 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #15171e 75%),
    linear-gradient(-45deg, transparent 75%, #15171e 75%);
  background-size: 28px 28px;
  background-position: 0 0, 0 14px, 14px -14px, -14px 0;
}

#gl {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

#toggle-panel {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 20;
  width: 44px;
  height: 44px;
  font-size: 20px;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  background: var(--panel-bg);
  color: var(--text);
  cursor: pointer;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
#toggle-panel:hover { border-color: var(--accent); }

#panel {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 15;
  width: 320px;
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  padding: 18px 18px 14px;
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  background: var(--panel-bg);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  transition: transform 0.28s cubic-bezier(0.2, 0.8, 0.2, 1), opacity 0.2s;
}
#panel.hidden {
  transform: translateX(calc(100% + 24px));
  opacity: 0;
  pointer-events: none;
}

#panel header { margin-bottom: 10px; }
#panel h1 {
  margin: 0;
  font-size: 22px;
  letter-spacing: 0.5px;
  font-weight: 700;
}
#panel h1 .version-tag {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.4px;
  color: var(--accent);
  vertical-align: middle;
  margin-left: 4px;
}
#panel .sub { margin: 2px 0 0; color: var(--muted); font-size: 12px; }

#panel section {
  padding: 12px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}
#panel h2 {
  margin: 0 0 10px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--muted);
}

.row { display: block; margin-bottom: 12px; font-size: 13px; }
.row span { display: flex; justify-content: space-between; margin-bottom: 5px; }
.row em { color: var(--accent); font-style: normal; font-variant-numeric: tabular-nums; }

input[type="range"] {
  width: 100%;
  height: 4px;
  appearance: none;
  -webkit-appearance: none;
  background: rgba(255, 255, 255, 0.16);
  border-radius: 4px;
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 0 4px rgba(90, 169, 255, 0.18);
}
input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px; border: none; border-radius: 50%;
  background: var(--accent); cursor: pointer;
}

.presets { display: flex; flex-wrap: wrap; gap: 8px; }
.presets button {
  flex: 1 1 calc(50% - 8px);
  padding: 8px;
  font-size: 12px;
  border-radius: 10px;
  border: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  cursor: pointer;
}
.presets button:hover { border-color: var(--accent); background: rgba(90, 169, 255, 0.12); }

.swatches {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 14px;
  margin-bottom: 12px;
}
.swatches label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  gap: 8px;
}
input[type="color"] {
  width: 40px; height: 26px;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  background: none;
  cursor: pointer;
  padding: 0;
}

.check { display: flex; align-items: center; gap: 8px; font-size: 13px; margin-bottom: 12px; }
.check input { width: 16px; height: 16px; accent-color: var(--accent); }

select {
  width: 100%;
  margin-top: 4px;
  padding: 7px 8px;
  border-radius: 8px;
  border: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
}

.buttons { display: flex; gap: 8px; margin-top: 14px; }
.buttons button {
  flex: 1;
  padding: 10px 8px;
  font-size: 13px;
  font-weight: 600;
  border-radius: 10px;
  border: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  cursor: pointer;
}
.buttons button:hover { border-color: var(--accent); }
.buttons .primary { background: var(--accent); border-color: var(--accent); color: #05101f; }
.buttons .primary:hover { filter: brightness(1.08); }

#customRes[hidden] { display: none; }

.custom-res .dims {
  display: flex;
  align-items: center;
  gap: 8px;
}
.custom-res input[type="number"] {
  width: 100%;
  padding: 7px 8px;
  border-radius: 8px;
  border: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font-size: 13px;
}
.custom-res .x { color: var(--muted); }

#version {
  position: fixed;
  left: 16px;
  bottom: 14px;
  z-index: 15;
  max-width: 360px;
  pointer-events: none;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.6);
}
#version .legal {
  display: block;
  margin-top: 3px;
  font-size: 10px;
  line-height: 1.45;
  color: rgba(255, 255, 255, 0.45);
}

#panel footer {
  margin-top: 8px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  font-size: 11px;
  color: var(--muted);
  line-height: 1.5;
}