:root {
  --bg-dark: #0d0414;
  --bg-glow: #1d0830;
  --magenta: #ff00ff;
  --cyan: #00ffff;
  --lime: #baff00;
  --text: #f7f7f7;
  --muted: #c8c8d0;
  --panel: rgba(25, 25, 25, 0.82);
  --border: #ff00ff;
  --shadow: 0 0 30px rgba(255, 0, 255, 0.25);
  font-family: "Space Grotesk", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--bg-dark);
  background-image:
    linear-gradient(to right, rgba(255, 0, 255, 0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 0, 255, 0.08) 1px, transparent 1px),
    radial-gradient(circle at 50% 50%, var(--bg-glow) 0%, #000 80%);
  background-size: 40px 40px, 40px 40px, 100% 100%;
  background-attachment: fixed;
  color: var(--text);
  overflow: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.15), rgba(0, 0, 0, 0.15) 1px, transparent 1px, transparent 2px);
  pointer-events: none;
  z-index: 1;
}

body::after {
  content: "";
  position: fixed;
  inset: -10px;
  background-image: repeating-radial-gradient(#000 0 0.0001%, #fff 0 0.0002%);
  background-size: 200% 200%;
  opacity: 0.04;
  pointer-events: none;
  z-index: 1;
  animation: grain 0.8s steps(6) infinite, flicker 4s ease-in-out infinite;
}

#bg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 0;
}

.ui {
  position: fixed;
  inset: 0;
  pointer-events: none;
  padding: 24px;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 16px;
  z-index: 2;
}

.ui.hidden {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.toggle-ui {
  position: fixed;
  bottom: calc(16px + env(safe-area-inset-bottom));
  right: calc(16px + env(safe-area-inset-right));
  z-index: 3;
  padding: 10px 14px;
  font-size: 12px;
  background: rgba(0, 0, 0, 0.7);
  border-color: #fff;
  box-shadow: 6px 6px 0 #000, 0 0 14px rgba(0, 255, 255, 0.4);
}

.panel {
  pointer-events: auto;
  background: var(--panel);
  border: 3px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  backdrop-filter: blur(10px) saturate(160%);
  box-shadow: 8px 8px 0 #000, 0 0 30px rgba(255, 0, 255, 0.25);
  transform: rotate(-1.2deg);
}

header.panel {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  position: absolute;
  top: calc(12px + env(safe-area-inset-top));
  right: calc(12px + env(safe-area-inset-right));
  transform: rotate(-1deg);
}

.brand h1 {
  margin: 0;
  font-size: 24px;
  letter-spacing: 1px;
  font-family: "Permanent Marker", cursive;
  color: var(--magenta);
  text-shadow: 3px 3px 0 #000, -2px -2px 0 var(--cyan);
}

.brand p {
  margin: 4px 0 0;
  color: var(--muted);
}

.tag {
  display: inline-block;
  background: var(--cyan);
  color: #000;
  padding: 4px 10px;
  border-radius: 999px;
  font-weight: 800;
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  box-shadow: 2px 2px 0 #000;
}

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

.btn {
  border: 3px solid #fff;
  background: var(--magenta);
  color: #fff;
  padding: 10px 16px;
  border-radius: 10px;
  font-weight: 800;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  box-shadow: 6px 6px 0 #000, 0 0 14px rgba(255, 0, 255, 0.4);
  transition: transform 0.12s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px) rotate(1deg);
  box-shadow: 6px 6px 0 var(--lime), 0 0 24px rgba(255, 0, 255, 0.45);
  background: var(--cyan);
  color: #000;
}

.btn:active {
  transform: translateY(1px);
}

.file-btn {
  background: rgba(255, 0, 255, 0.18);
  border-color: var(--border);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}

/* Compact HUD panel bottom-left */
.panel.hud {
  position: absolute;
  bottom: calc(14px + env(safe-area-inset-bottom));
  left: calc(14px + env(safe-area-inset-left));
  width: 360px;
  max-width: calc(100% - 28px);
  transform: rotate(-1deg);
}

/* Avoid panels covering the whole viewport; allow internal scroll */
.panel {
  max-height: 45vh;
  overflow: auto;
}

h2 {
  margin: 0 0 6px;
  font-size: 18px;
  letter-spacing: 0.08em;
  font-family: "Rubik Glitch", cursive;
  color: var(--lime);
  text-shadow: 2px 2px 0 #000, 0 0 12px rgba(186, 255, 0, 0.4);
}

label {
  display: block;
  margin: 8px 0;
  color: var(--muted);
}

input[type="range"] {
  width: 100%;
}

#status {
  margin: 0;
  font-weight: 700;
  color: var(--cyan);
}

@keyframes grain {
  0%, 100% { transform: translate(0, 0); }
  10% { transform: translate(-5px, -3px); }
  20% { transform: translate(3px, 5px); }
  30% { transform: translate(-3px, -5px); }
  40% { transform: translate(5px, 3px); }
  50% { transform: translate(-5px, 5px); }
}

@keyframes flicker {
  0%, 100% { opacity: 0.04; }
  50% { opacity: 0.06; }
  75% { opacity: 0.03; }
}

@media (max-width: 640px) {
  .ui {
    padding: 10px;
    grid-template-rows: auto 1fr;
    align-content: start;
  }
  header.panel {
    position: fixed;
    top: calc(8px + env(safe-area-inset-top));
    left: calc(8px + env(safe-area-inset-left));
    right: calc(8px + env(safe-area-inset-right));
    flex-direction: column;
    align-items: stretch;
    transform: none;
  }
  .controls {
    width: 100%;
  }
  .panel.hud {
    position: fixed;
    bottom: calc(8px + env(safe-area-inset-bottom));
    left: calc(8px + env(safe-area-inset-left));
    right: calc(8px + env(safe-area-inset-right));
    width: auto;
    transform: none;
  }
  h2 {
    font-size: 16px;
  }
  .btn {
    flex: 1 1 auto;
    text-align: center;
    padding: 8px 12px;
    font-size: 12px;
  }
  .toggle-ui {
    bottom: calc(8px + env(safe-area-inset-bottom));
    right: calc(8px + env(safe-area-inset-right));
    padding: 10px 14px;
    font-size: 13px;
  }
}

/* Also adapt when viewport height is short (landscape phones) */
@media (max-height: 480px) {
  .panel { max-height: 38vh; }
  header.panel { transform: none; }
  .panel.hud { transform: none; }
}