:root {
  color-scheme: dark;
  --bg: #111318;
  --panel: #181c24;
  --panel-2: #1f2430;
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.62);
  --border: rgba(255, 255, 255, 0.08);
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.24);
  --ease: cubic-bezier(0.25, 1, 0.5, 1);
  font-family: system-ui, sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { min-height: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, #171b24 0%, var(--bg) 60%);
  color: var(--text);
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto auto;
  gap: 1rem;
  padding: 1rem;
}

.topbar,
.win-panel,
.ad-space {
  background: rgba(24, 28, 36, 0.86);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  gap: 1rem;
}

.topbar-title-group {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  min-width: 0;
}

.topbar h1,
.win-panel p {
  margin: 0;
}

.timer {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.switch-level-button {
  flex: 0 0 auto;
  padding: 0.65rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
}

.switch-level-button:hover {
  background: rgba(255, 255, 255, 0.08);
}

.board {
  display: flex;
  align-items: stretch;
}

.bars {
  flex: 1;
  min-height: 280px;
  display: flex;
  align-items: flex-end;
  gap: 0.5rem;
  padding: 1rem;
  overflow: hidden;
  position: relative;
  touch-action: none;
  user-select: none;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.02);
}

.bar {
  flex: 1 1 0;
  min-width: 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px 12px 0 0;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.18);
  transform-origin: center bottom;
  transition:
    transform 160ms var(--ease),
    box-shadow 160ms var(--ease),
    opacity 160ms var(--ease);
  will-change: transform;
}

.bar.is-dragging {
  z-index: 2;
  box-shadow: 0 18px 28px rgba(0, 0, 0, 0.28);
  opacity: 0.96;
  pointer-events: none;
}

.win-panel {
  display: grid;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
}

.win-panel:not([hidden]) {
  animation: winPanelIn 240ms var(--ease);
}

.ad-space {
  min-height: 96px;
}

button {
  justify-self: start;
}

.win-ripple {
  position: fixed;
  inset: 50% auto auto 50%;
  width: min(80vw, 42rem);
  aspect-ratio: 1;
  transform: translate(-50%, -50%) scale(0.2);
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(circle, rgba(145, 160, 255, 0.24) 0%, rgba(145, 160, 255, 0.1) 35%, rgba(145, 160, 255, 0) 70%);
  animation: winRipple 720ms var(--ease) forwards;
}

@keyframes winPanelIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.completion-overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  background: rgba(6, 9, 15, 0.74);
  backdrop-filter: blur(12px);
  z-index: 20;
}

.completion-card {
  width: min(90vw, 30rem);
  padding: 1.75rem 1.5rem 1.5rem;
  border-radius: 26px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: linear-gradient(180deg, rgba(25, 29, 40, 0.98), rgba(18, 22, 32, 0.98));
  box-shadow: 0 28px 64px rgba(0, 0, 0, 0.42);
  text-align: center;
  animation: completionCardIn 240ms var(--ease);
}

.completion-eyebrow {
  margin: 0 0 0.5rem;
  color: #bac2ff;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

.completion-card h2 {
  margin: 0;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
}

.completion-card p {
  margin: 0.75rem 0 1.25rem;
  color: var(--muted);
  line-height: 1.6;
}

@keyframes completionCardIn {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes winRipple {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.15);
  }
  18% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(1);
  }
}