:root {
  color-scheme: dark;
  --bg: #0f1114;
  --panel: #161a1f;
  --cell: #1d2126;
  --stroke: #2a2f36;
  --text: #e8eaed;
  --muted: #a0a7b4;
  --accent: #d6b46a;
  --ok: #7dd3fc;
  --warn: #fca5a5;
  --font-sans: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  background: radial-gradient(circle at 20% 20%, rgba(214, 180, 106, 0.08), transparent 60%),
    var(--bg);
  color: var(--text);
  display: flex;
  align-items: stretch;
  justify-content: center;
  padding: clamp(0.5rem, 4vw, 2.5rem);
  overflow-x: hidden;
}

.app {
  width: 100%;
  max-width: 920px;
  background: var(--panel);
  border-radius: 18px;
  border: 1px solid var(--stroke);
  padding: clamp(1rem, 3vw, 2rem);
  box-shadow: 0 30px 80px rgba(15, 17, 20, 0.35);
  display: flex;
  flex-direction: column;
  gap: clamp(0.9rem, 2vw, 1.6rem);
  overflow: hidden;
}

.app__header {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.app__header h1 {
  margin: 0;
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.metrics {
  color: var(--ok);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: stretch;
}

.controls__group {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
  width: 100%;
}

.controls__group--primary {
  justify-content: center;
}

.controls__group--dataset,
.controls__group--selects {
  justify-content: space-between;
  align-items: center;
}

.btn {
  padding: 0.65rem 1.1rem;
  border-radius: 10px;
  border: 1px solid var(--stroke);
  background: var(--cell);
  color: var(--text);
  font-size: 0.95rem;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: transform 150ms ease, border-color 150ms ease, background-color 150ms ease;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-1px);
  border-color: var(--accent);
}

.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #111318;
}

.btn[disabled] {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn--muted {
  color: var(--muted);
}

.btn--muted[aria-pressed="true"] {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(214, 180, 106, 0.15);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.field--slider {
  min-width: 0;
  width: min(340px, 100%);
}

.field--slider > span {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.field--slider strong {
  color: var(--text);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.field--slider input {
  width: 100%;
}

select {
  background: var(--cell);
  color: var(--text);
  border: 1px solid var(--stroke);
  border-radius: 8px;
  padding: 0.4rem 0.75rem;
  font-size: 1rem;
}

input[type="range"] {
  accent-color: var(--accent);
}

.stage {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  background: linear-gradient(145deg, rgba(22, 26, 31, 0.9), rgba(13, 15, 18, 0.7));
  border-radius: 12px;
  border: 1px solid var(--stroke);
  padding: clamp(1rem, 3vw, 1.4rem);
}

.stage__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  color: var(--muted);
}

.stage__overlay {
  color: var(--text);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
}

.stage__body {
  min-height: clamp(220px, 48vh, 360px);
  display: grid;
  place-items: center;
  outline: none;
}

.bars {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: repeat(var(--bar-count, 1), minmax(0, 1fr));
  gap: clamp(2px, 0.6vw, 6px);
  align-items: end;
}

.bars__bar {
  width: 100%;
  border-radius: 6px 6px 0 0;
  background: rgba(214, 180, 106, 0.4);
  position: relative;
  transform-origin: bottom center;
  height: calc(var(--value, 0) * 100%);
  transition: height 140ms ease, background-color 140ms ease, transform 140ms ease;
}

.bars__bar::after {
  content: attr(data-value);
  position: absolute;
  bottom: -1.65rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.7rem;
  color: var(--muted);
  letter-spacing: 0.03em;
}

.bars__bar.is-active {
  background: var(--accent);
  transform: scaleX(1.06);
}

.bars[data-playing="1"] .bars__bar.is-active {
  box-shadow: 0 12px 24px rgba(214, 180, 106, 0.26);
}

.timeline {
  width: 100%;
  accent-color: var(--accent);
}

@media (max-width: 768px) {
  .controls__group {
    flex-direction: column;
    align-items: stretch;
  }

  .controls__group--primary {
    flex-direction: row;
    justify-content: center;
  }

  .controls__group--dataset,
  .controls__group--selects {
    gap: 0.65rem;
  }

  .bars__bar::after {
    display: none;
  }

  .controls .btn,
  .controls select {
    width: 100%;
  }

  .controls__group--primary .btn {
    flex: 1 1 calc(50% - 0.5rem);
    min-width: 0;
  }

  .controls__group--primary .btn:first-child {
    flex-basis: 100%;
  }

  .field--slider {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .app__header h1 {
    font-size: clamp(1.6rem, 6vw, 2.2rem);
  }

  .stage {
    padding: clamp(0.75rem, 4vw, 1.1rem);
  }

  .stage__body {
    min-height: clamp(200px, 46vh, 320px);
  }
}

@media (min-width: 768px) {
  .app__header {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  .controls {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: flex-start;
  }

  .controls__group--primary {
    flex-wrap: nowrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}