*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0f0f0f;
  --surface: #1a1a1a;
  --border: rgba(255, 255, 255, 0.08);
  --text: #ffffff;
  --muted: rgba(255, 255, 255, 0.45);
  --accent: #06b6d4;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  user-select: none;
  overflow: hidden;
}

.stage {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  padding: 5rem 1.5rem 3rem;
}

.eject-ring {
  position: relative;
  width: min(62vw, 44vh, 300px);
  aspect-ratio: 1;
}

.ring-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.ring-track {
  fill: none;
  stroke: rgba(255, 255, 255, 0.06);
  stroke-width: 4;
}

.ring-progress {
  fill: none;
  stroke: var(--accent);
  stroke-width: 5;
  stroke-linecap: round;
  stroke-dasharray: 565.5; /* 2π·90 */
  stroke-dashoffset: 565.5;
  filter: drop-shadow(0 0 8px rgba(6, 182, 212, 0.4));
}

.eject-btn {
  position: absolute;
  inset: 14px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 25%, #1e2a2e, #0d1518);
  border: 1px solid rgba(6, 182, 212, 0.25);
  color: var(--text);
  font: inherit;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  transition: border-color 0.2s ease, background 0.2s ease;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}
.eject-btn:hover { border-color: var(--accent); }

.eject-icon {
  font-size: clamp(3.4rem, 12vw, 5.5rem);
  line-height: 1;
}
.eject-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--muted);
}

.eject-btn[aria-pressed="true"] {
  background: radial-gradient(circle at 30% 25%, #0e7490, #164e63);
  border-color: var(--accent);
}
.eject-btn[aria-pressed="true"] .eject-label { color: #fff; }

.advanced {
  width: min(88vw, 400px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.85rem 1rem;
}
.advanced > summary {
  list-style: none;
  cursor: pointer;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.15rem 0;
}
.advanced > summary::-webkit-details-marker { display: none; }
.advanced > summary::before {
  content: '›';
  display: inline-block;
  font-size: 1.05rem;
  line-height: 0.9;
  transition: transform 0.15s;
}
.advanced[open] > summary::before { transform: rotate(90deg); }
.advanced[open] { padding-bottom: 1rem; }

.field-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0.9rem 0 0.4rem;
}
.field-label span {
  color: var(--text);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.hint {
  max-width: 380px;
  text-align: center;
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.5;
}

.hint.warning {
  color: #fbbf24;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

/* Top bar */
.top-bar {
  position: fixed;
  top: env(safe-area-inset-top, 0);
  right: env(safe-area-inset-right, 0);
  padding: 0.85rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  z-index: 20;
}
.back-link {
  color: var(--muted);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.4rem 0.5rem;
  transition: color 0.15s ease;
}
.back-link:hover { color: var(--text); }

.cal-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  font: inherit;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 0.42rem 0.7rem;
  border-radius: 6px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.cal-btn:hover { color: var(--text); border-color: var(--muted); }