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

:root {
  --bg: #0d0d1a;
  --red: #e74c3c;
  --red-dark: #c0392b;
  --text: #f0ece4;
  --muted: #888;
  --bubble-bg: rgba(20, 20, 35, 0.92);
}

html, body {
  height: 100%;
  width: 100%;
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
  overscroll-behavior: none;
  touch-action: none;
}

/* ── Sky / stars ── */
.sky {
  position: fixed;
  inset: 0;
  z-index: 0;
  background: radial-gradient(ellipse at 50% 0%, #1a1a3a 0%, #0d0d1a 70%);
  pointer-events: none;
}

.stars {
  position: absolute;
  inset: 0;
}

.star {
  position: absolute;
  border-radius: 50%;
  background: #fff;
  opacity: 0;
  animation: twinkle var(--dur, 3s) ease-in-out var(--delay, 0s) infinite;
}

@keyframes twinkle {
  0%, 100% { opacity: 0; }
  50% { opacity: var(--peak, 0.7); }
}

/* ── Scene container ── */
.scene {
  position: fixed;
  inset: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

/* ── Swing pivot & wrapper ── */
.swing-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  transform-origin: center top;
  transform: rotate(0deg);
  transition: none;
  will-change: transform;
  width: min(60vw, 320px);
}

/* ── Swing SVG (ropes + boat unified) ── */
.swing-svg {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 10px 28px rgba(200, 40, 30, 0.45));
  transition: filter 0.35s ease;
}

/* ── Message bubble ── */
.message-bubble {
  margin-top: 18px;
  background: var(--bubble-bg);
  border: 1px solid rgba(231, 76, 60, 0.3);
  border-radius: 12px;
  padding: 10px 18px;
  font-size: clamp(0.75rem, 2vw, 0.95rem);
  color: var(--text);
  text-align: center;
  line-height: 1.5;
  max-width: 260px;
  backdrop-filter: blur(6px);
  opacity: 0.9;
  transition: opacity 0.4s ease;
  pointer-events: none;
}

/* ── Scroll track (right side visual) ── */
.scroll-track {
  position: fixed;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 120px;
  background: rgba(255,255,255,0.08);
  border-radius: 4px;
  z-index: 10;
  overflow: hidden;
}

.scroll-track-inner {
  width: 100%;
  height: 0%;
  background: var(--red);
  border-radius: 4px;
  transition: height 0.15s ease;
}

/* ── Speed indicator ring ── */
.speed-ring {
  position: fixed;
  bottom: clamp(80px, 12vh, 120px);
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  opacity: 0;
  transition: opacity 0.4s;
}

.speed-ring.visible { opacity: 1; }

.speed-ring svg { display: block; }

.speed-label {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ── Footer ── */
.footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 10;
  text-align: center;
  padding: 16px 20px;
  font-size: clamp(0.7rem, 1.8vw, 0.85rem);
  color: var(--muted);
  line-height: 1.7;
  background: linear-gradient(to top, rgba(13,13,26,0.95), transparent);
  pointer-events: none;
}

.swing-svg.fast {
  filter: drop-shadow(0 0 36px rgba(220, 50, 30, 0.9))
          drop-shadow(0 10px 18px rgba(200, 40, 30, 0.55));
}