:root {
  color-scheme: dark;
  --bg-gradient-start: #101320;
  --bg-gradient-end: #060709;
  --surface: rgba(24, 32, 48, 0.82);
  --surface-light: rgba(36, 48, 70, 0.88);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(103, 213, 181, 0.4);
  --accent-rhythm: #ff6b6b;
  --accent-drone: #67d5b5;
  --text-primary: #f5f7fb;
  --text-muted: #aab5ce;
  --mono: "Courier New", Courier, monospace;
  --sans: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, var(--bg-gradient-start), var(--bg-gradient-end));
  color: var(--text-primary);
  font-family: var(--sans);
  padding: 2.5rem 1.5rem 3rem;
  display: flex;
  justify-content: center;
}

.app {
  width: min(1200px, 100%);
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.header h1 {
  margin: 0 0 0.6rem;
  font-size: 2.4rem;
  letter-spacing: 0.04em;
}

.header p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.6;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.75rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(8px);
}

.blend-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  align-items: start;
}

.blend-control {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-weight: 500;
  align-items: center;
}

.blend-control label {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-muted);
}

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

.blend-control .value {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent-drone);
}

.engine-column {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.75rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(8px);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.panel-header h2 {
  margin: 0;
  font-size: 1.5rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.transport-controls {
  display: flex;
  justify-content: center;
}

.transport-btn {
  padding: 0.7rem 2.2rem;
  border-radius: 999px;
  border: none;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
  background: linear-gradient(45deg, var(--accent-drone), #2db6a3);
  color: #041f20;
  box-shadow: 0 14px 30px rgba(103, 213, 181, 0.28);
}

.transport-btn.is-active {
  background: linear-gradient(45deg, var(--accent-rhythm), #d84f4f);
  color: #220404;
  box-shadow: 0 14px 30px rgba(255, 107, 107, 0.32);
}

.transport-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.transport-btn:not(:disabled):hover {
  transform: translateY(-2px);
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 1.25rem;
}

.controls-column {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.control-row {
  display: grid;
  grid-template-columns: minmax(140px, 200px) 1fr 60px;
  gap: 0.75rem;
  align-items: center;
  padding-right: 2.5rem;
}

.control-label {
  font-size: 0.7rem;
  color: var(--accent-rhythm);
  font-family: var(--mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.control-value {
  min-width: 3ch;
  font-size: 0.75rem;
  text-align: right;
  color: var(--accent-drone);
  font-family: var(--mono);
}

.slider {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.18);
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-rhythm);
  box-shadow: 0 0 12px rgba(255, 107, 107, 0.6);
  cursor: pointer;
}

.slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-rhythm);
  border: none;
  cursor: pointer;
}

.slider-value {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent-drone);
}

.drone-inline {
  margin-top: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  flex-wrap: wrap;
}

.voice-display {
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

@media (max-width: 720px) {
  body {
    padding: 1.5rem 1rem 2rem;
  }

  .card {
    padding: 1.5rem;
  }

  .panel-header {
    flex-direction: column;
    align-items: flex-start;
  }

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

}