:root {
  --bg-0: #071116;
  --bg-1: #0f2430;
  --bg-2: #18343f;
  --card: rgba(7, 17, 22, 0.78);
  --text: #eaf8f6;
  --muted: #94b9b3;
  --accent: #5eead4;
  --accent-2: #f9a66c;
  --border: rgba(94, 234, 212, 0.2);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 10%, rgba(94, 234, 212, 0.18), transparent 40%),
    radial-gradient(circle at 80% 90%, rgba(249, 166, 108, 0.2), transparent 38%),
    linear-gradient(145deg, var(--bg-0), var(--bg-1) 45%, var(--bg-2));
  display: grid;
  place-items: center;
  padding: 24px;
}

.halo {
  position: fixed;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  filter: blur(48px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.25;
  animation: drift 14s ease-in-out infinite alternate;
}

.halo.one {
  background: var(--accent);
  top: -80px;
  left: -60px;
}

.halo.two {
  background: var(--accent-2);
  right: -80px;
  bottom: -90px;
  animation-delay: 0.8s;
}

@keyframes drift {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }

  to {
    transform: translate3d(16px, -22px, 0) scale(1.08);
  }
}

.app {
  width: min(980px, 100%);
  position: relative;
  z-index: 1;
  border: 1px solid var(--border);
  border-radius: 22px;
  backdrop-filter: blur(16px);
  background: var(--card);
  box-shadow: 0 22px 64px rgba(0, 0, 0, 0.35);
  overflow: hidden;
  animation: rise 500ms cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.99);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.header {
  padding: 26px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.title {
  margin: 0;
  font-size: clamp(1.6rem, 2.6vw, 2.15rem);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.subtitle {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.app-version {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  color: var(--accent);
}

.state {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--accent);
  white-space: nowrap;
}

.content {
  padding: 24px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 26px;
}

.panel {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
  background: rgba(15, 36, 48, 0.35);
}

.panel h2 {
  margin: 0 0 14px;
  font-size: 0.98rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.control {
  margin-bottom: 16px;
}

.control:last-child {
  margin-bottom: 0;
}

.line {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 7px;
  gap: 12px;
}

.line label {
  font-size: 0.92rem;
}

.value {
  font-family: "IBM Plex Mono", monospace;
  color: var(--accent);
  font-size: 0.86rem;
}

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

input[type="range"] {
  appearance: none;
  height: 7px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid #041015;
  background: #dbfffb;
  cursor: pointer;
}

select {
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(7, 17, 22, 0.72);
  color: var(--text);
  padding: 10px;
  font-family: "Space Grotesk", sans-serif;
}

.preset-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

.preset-apply {
  flex: 0 0 auto;
  padding-inline: 18px;
  background: rgba(94, 234, 212, 0.15);
  color: var(--text);
  border: 1px solid var(--border);
}

.actions {
  display: flex;
  gap: 12px;
  margin-top: 10px;
}

button {
  flex: 1;
  border: 0;
  border-radius: 12px;
  padding: 12px 16px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, opacity 160ms ease;
}

button:active {
  transform: translateY(1px);
}

#startBtn {
  background: linear-gradient(90deg, #46e3ca, #4bcfe9);
  color: #042229;
  box-shadow: 0 10px 24px rgba(75, 207, 233, 0.3);
}

#stopBtn {
  background: linear-gradient(90deg, #f8b37f, #f9977a);
  color: #32180f;
}

#stopBtn:disabled {
  opacity: 0.48;
  cursor: not-allowed;
  box-shadow: none;
}

.hint {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.86rem;
}

.meter {
  margin-top: 12px;
  height: 14px;
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: rgba(7, 17, 22, 0.75);
}

.meter-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #5eead4, #f9a66c);
  transition: width 140ms linear;
}

@media (max-width: 860px) {
  .content {
    grid-template-columns: 1fr;
  }
}