:root {
  color-scheme: dark;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  --panel-bg: rgba(0, 0, 0, 0.65);
  --panel-border: rgba(0, 255, 170, 0.3);
  --panel-shadow: 0 20px 60px rgba(0, 0, 0, 0.7);
  --accent: #0aff9d;
  --text: #e0ffe5;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, #001a0a, #000);
  overflow: hidden;
  color: var(--text);
}

.container {
  position: relative;
  min-height: 100vh;
}

#matrix-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: block;
  background: transparent;
  z-index: 0;
}

.control-panel {
  position: fixed;
  z-index: 1;
  max-width: 420px;
  padding: 2rem;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(6px);
  border-radius: 20px;
  box-shadow: var(--panel-shadow);
  left: 50%;
  top: 10vh;
  transform: translateX(-50%);
  cursor: move;
  user-select: none;
  display: none !important;
}

h1 {
  margin-top: 0;
  margin-bottom: 0.25rem;
  letter-spacing: 0.2rem;
  text-transform: uppercase;
}

p {
  margin-top: 0;
  margin-bottom: 1.5rem;
  color: #b6f5cf;
}

.control {
  display: grid;
  grid-template-columns: 90px 1fr auto auto;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.control-label {
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-size: 0.85rem;
  color: #a2dfbd;
}

.control input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.value {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.value-input {
  width: 60px;
  padding: 0.25rem 0.4rem;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--panel-border);
  border-radius: 5px;
  color: var(--accent);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
  text-align: center;
}

.value-input:focus {
  outline: none;
  border-color: var(--accent);
  background: rgba(10, 255, 157, 0.1);
}

.toggle-panel {
  margin-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1.25rem;
}

.toggle-heading {
  display: block;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.1rem;
  color: #7ed5a7;
}

.toggle-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.5rem;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
  color: #d4ffe2;
}

.dragon-toggle {
  margin-top: 0.75rem;
}

.toggle input {
  accent-color: var(--accent);
}

.upload-control {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 1rem;
}

.upload-control input[type="file"] {
  color: var(--text);
  font-size: 0.85rem;
}

.upload-hint {
  margin-top: 0.35rem;
  margin-bottom: 0;
  font-size: 0.75rem;
  color: #a5cdb8;
}

.section-divider {
  margin: 1.25rem 0;
  border: none;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.config-btn {
  margin-top: 0.75rem;
  width: 100%;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--panel-border);
  background: transparent;
  color: var(--text);
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.config-btn:hover {
  background: rgba(10, 255, 157, 0.08);
}

@media (max-width: 600px) {
  .control-panel {
    width: min(90vw, 420px);
    padding: 1.5rem;
  }

  .control {
    grid-template-columns: 1fr;
  }

  .value {
    justify-self: end;
  }
}