:root {
  --bg: #090b10;
  --panel: #141821;
  --panel-soft: #1d2330;
  --text: #f6f7fb;
  --muted: #9aa4b7;
  --orange: #ff9f1c;
  --orange-strong: #ff7a00;
  --danger: #ff3b3b;
  --off: #3a4252;
  --shadow: rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(255, 159, 28, 0.12), transparent 34rem),
    var(--bg);
}

.app {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.signal-card {
  width: min(100%, 680px);
  padding: clamp(24px, 5vw, 44px);
  text-align: center;
  background: linear-gradient(145deg, var(--panel), #10131a);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 28px;
  box-shadow: 0 24px 70px var(--shadow);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--orange);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 30px;
  font-size: clamp(2.2rem, 7vw, 4.4rem);
  letter-spacing: 0;
}

.signal-display {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: clamp(16px, 4vw, 32px);
  margin-bottom: 28px;
}

.arrow {
  display: grid;
  place-items: center;
  min-height: 132px;
  border-radius: 24px;
  background: var(--panel-soft);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.arrow span {
  width: 78px;
  height: 78px;
  border-top: 18px solid var(--off);
  border-left: 18px solid var(--off);
  transition: border-color 0.2s ease, filter 0.2s ease;
}

.arrow-left span {
  transform: rotate(-45deg);
}

.arrow-right span {
  transform: rotate(135deg);
}

.arrow.active {
  border-color: rgba(255, 159, 28, 0.9);
  box-shadow: 0 0 34px rgba(255, 159, 28, 0.28);
  animation: pulsePanel 0.5s infinite alternate;
}

.arrow.active span {
  border-color: var(--orange);
  filter: drop-shadow(0 0 16px rgba(255, 159, 28, 0.9));
  animation: blinkArrow 0.5s infinite;
}

.bike-light {
  display: grid;
  place-items: center;
  gap: 10px;
  min-width: 116px;
}

.light-indicator {
  width: 74px;
  height: 74px;
  border-radius: 50%;
  background: var(--off);
  border: 8px solid #252c3a;
  box-shadow: inset 0 0 16px rgba(0, 0, 0, 0.45);
  transition: background 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.light-indicator.on {
  background: var(--orange);
  border-color: rgba(255, 159, 28, 0.35);
  box-shadow: 0 0 30px rgba(255, 159, 28, 0.7), inset 0 0 18px rgba(255, 255, 255, 0.35);
}

.bike-light p {
  margin: 0;
  color: var(--muted);
  font-weight: 800;
}

.status-panel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.status-panel div {
  padding: 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.status-panel.danger div:first-child {
  border-color: rgba(255, 59, 59, 0.7);
  box-shadow: 0 0 26px rgba(255, 59, 59, 0.16);
}

.status-panel.danger div:first-child strong {
  color: var(--danger);
}

.status-panel span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.8rem;
}

.status-panel strong {
  display: block;
  min-height: 20px;
  color: var(--text);
  font-size: clamp(0.86rem, 2vw, 1rem);
}

.controls {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

button {
  min-height: 56px;
  border: 0;
  border-radius: 18px;
  color: #111318;
  background: var(--orange);
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 12px 28px rgba(255, 159, 28, 0.22);
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

button:hover {
  background: var(--orange-strong);
  transform: translateY(-2px);
  box-shadow: 0 16px 34px rgba(255, 122, 0, 0.28);
}

button:active {
  transform: translateY(0);
}

button.active {
  background: #fff2dc;
}

@keyframes blinkArrow {
  0%, 45% {
    opacity: 1;
  }

  46%, 100% {
    opacity: 0.2;
  }
}

@keyframes pulsePanel {
  from {
    transform: scale(1);
  }

  to {
    transform: scale(1.02);
  }
}

@media (max-width: 620px) {
  .signal-display {
    grid-template-columns: 1fr;
  }

  .arrow {
    min-height: 104px;
  }

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