:root {
  --bg: #08111b;
  --bg-soft: #102235;
  --card: rgba(7, 24, 38, 0.8);
  --card-border: rgba(149, 195, 238, 0.28);
  --text: #e6f4ff;
  --muted: #9ec0dc;
  --accent: #51e5a9;
  --accent-2: #4bc8ff;
  --danger: #ff7f66;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Space Grotesk", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 20%, #194267 0%, transparent 45%),
    radial-gradient(circle at 85% 75%, #16314f 0%, transparent 40%),
    linear-gradient(135deg, var(--bg) 0%, var(--bg-soft) 100%);
  overflow-x: hidden;
}

.bg-shape {
  position: fixed;
  z-index: 0;
  border-radius: 999px;
  filter: blur(90px);
  opacity: 0.25;
  pointer-events: none;
}

.bg-shape-a {
  width: 350px;
  height: 350px;
  background: #37d5ff;
  top: -130px;
  right: -100px;
}

.bg-shape-b {
  width: 320px;
  height: 320px;
  background: #4de391;
  bottom: -130px;
  left: -110px;
}

.layout {
  position: relative;
  z-index: 1;
  width: min(1400px, 100% - 2rem);
  margin: 1rem auto;
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 1rem;
}

.controls,
.viewer {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  backdrop-filter: blur(10px);
}

.controls {
  padding: 1rem;
  max-height: calc(100vh - 2rem);
  overflow: auto;
}

.controls h1 {
  margin: 0;
  font-size: 2rem;
  letter-spacing: 0.02em;
}

.hint {
  margin: 0.35rem 0 1rem;
  color: var(--muted);
}

.audio-controls {
  display: grid;
  gap: 0.5rem;
}

.btn,
.file-btn {
  font: inherit;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  border: none;
  border-radius: 12px;
  padding: 0.6rem 0.85rem;
  background: linear-gradient(130deg, var(--accent) 0%, #2fd2a5 100%);
  color: #062028;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: transform 140ms ease, box-shadow 140ms ease;
}

.btn:hover,
.file-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.26);
}

.btn-muted {
  background: linear-gradient(120deg, #9ec8e7 0%, #70afde 100%);
  color: #062032;
}

#audioFile {
  display: none;
}

.status {
  font-family: "IBM Plex Mono", monospace;
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 0.15rem;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin: 1rem 0 0.75rem;
  color: var(--text);
}

.slider-grid {
  display: grid;
  gap: 0.65rem;
}

.slider-item {
  background: rgba(8, 35, 55, 0.7);
  border: 1px solid rgba(131, 189, 236, 0.22);
  border-radius: 12px;
  padding: 0.55rem 0.6rem;
}

.slider-item .row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.slider-item .name {
  font-size: 0.82rem;
  color: var(--muted);
}

.slider-item .value {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
}

.slider-item input[type="range"] {
  width: 100%;
  accent-color: var(--accent-2);
}

.viewer {
  padding: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

#canvasWrap {
  width: 100%;
  max-width: 1100px;
  aspect-ratio: 16 / 9;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(147, 194, 235, 0.28);
}

#canvasWrap canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
}

@media (max-width: 1100px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .controls {
    max-height: none;
  }
}