:root {
  color-scheme: dark;
  --bg: #090b10;
  --panel: rgba(17, 21, 28, 0.92);
  --panel-strong: rgba(23, 28, 36, 0.98);
  --border: rgba(173, 182, 197, 0.16);
  --text: #f2efe7;
  --muted: #a4acba;
  --accent: #d48f57;
  --accent-soft: rgba(212, 143, 87, 0.15);
  --ok: #b8c58f;
  --ease-out: cubic-bezier(0.2, 0, 0, 1);
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top, rgba(138, 111, 84, 0.08), transparent 36%),
    linear-gradient(180deg, #0d1015 0%, #090b10 100%);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  overflow-x: hidden;
}

button,
input,
output {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

button:active {
  transform: scale(0.97);
}

button:focus-visible,
input:focus-visible {
  outline: 2px solid #f0c48a;
  outline-offset: 2px;
}

.app-shell {
  width: min(100%, 1300px);
  margin: 0 auto;
  padding: 1rem;
}

.topbar {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1rem;
  align-items: end;
}

.eyebrow,
.panel-label {
  margin: 0;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.72rem;
  color: var(--muted);
}

h1 {
  margin: 0.15rem 0 0;
  font-size: clamp(2rem, 7vw, 3.35rem);
  line-height: 0.96;
  max-width: 10ch;
}

.topbar-copy {
  margin: 0;
  color: var(--muted);
  max-width: 62ch;
  font-size: 0.98rem;
  line-height: 1.5;
}

.layout {
  display: grid;
  gap: 1rem;
}

.viewport-card,
.control-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 1.4rem;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
}

.viewport-card {
  position: relative;
  min-height: 54vh;
  overflow: hidden;
}

#scene {
  display: block;
  width: 100%;
  height: clamp(22rem, 62vh, 46rem);
  touch-action: none;
}

.viewport-note {
  position: absolute;
  left: 0.9rem;
  right: 0.9rem;
  bottom: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 237, 211, 0.12);
  background: rgba(17, 20, 28, 0.84);
  backdrop-filter: blur(16px);
}

.viewport-note p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: right;
}

.live-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0 0.95rem;
  border-radius: 999px;
  background: rgba(184, 197, 143, 0.1);
  color: #dce8b9;
}

.live-dot {
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 999px;
  background: var(--ok);
  animation: pulse 4s var(--ease-standard) infinite;
}

.control-card {
  display: grid;
  gap: 1rem;
  padding: 1rem;
}

.panel {
  padding: 1.1rem;
  background: var(--panel-strong);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: 1.05rem;
}

.system-list {
  list-style: none;
  padding: 0;
  margin: 0.9rem 0 0;
  display: grid;
  gap: 0.85rem;
}

.system-list li {
  display: grid;
  gap: 0.2rem;
}

.system-list strong {
  font-size: 0.95rem;
}

.system-list span,
.metric span {
  color: var(--muted);
}

.toolbar,
.button-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.65rem;
}

.button-row {
  margin-top: 1.15rem;
}

.tool-button,
.secondary-button {
  min-height: 46px;
  border-radius: 999px;
  padding: 0.75rem 0.95rem;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  transition: transform 0.22s var(--ease-standard), opacity 0.22s var(--ease-standard), background-color 0.22s var(--ease-standard), border-color 0.22s var(--ease-standard);
}

.tool-button.is-active {
  background: rgba(212, 143, 87, 0.22);
  color: #ffe6cb;
}

.control-grid {
  display: grid;
  gap: 1.15rem;
  margin-top: 1.15rem;
}

.control {
  display: grid;
  gap: 0.45rem;
}

.control span {
  font-size: 0.92rem;
}

.control output {
  color: var(--muted);
  justify-self: end;
}

.control input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  min-height: 28px;
}

.metrics-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.metric {
  min-height: 76px;
  display: grid;
  align-content: space-between;
  padding: 0.85rem;
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.035);
}

.metric strong {
  font-size: 1.3rem;
}

@keyframes pulse {
  0%,
  100% { transform: scale(0.92); opacity: 0.65; }
  50% { transform: scale(1); opacity: 1; }
}

@media (min-width: 980px) {
  .topbar {
    grid-template-columns: 1.15fr 0.95fr;
  }

  .layout {
    grid-template-columns: minmax(0, 1.5fr) minmax(320px, 0.9fr);
    align-items: start;
  }

  .control-card {
    position: sticky;
    top: 1rem;
  }
}

@media (max-width: 640px) {
  .app-shell {
    padding: 0.8rem;
  }

  .viewport-card {
    min-height: 46vh;
  }

  #scene {
    height: 52vh;
  }

  .viewport-note {
    border-radius: 1rem;
    flex-direction: column;
    align-items: stretch;
  }

  .viewport-note p {
    text-align: left;
  }

  .toolbar,
  .button-row,
  .metrics-panel {
    grid-template-columns: 1fr;
  }
}

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