:root {
  --bg-0: #10131c;
  --bg-1: #232b3d;
  --ink: #f4f6fb;
  --accent-a: #cfd9ff;
  --accent-b: #7fb2ff;
  --line: rgba(255, 255, 255, 0.16);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  min-height: 100vh;
  color: var(--ink);
  font-family: "Yu Gothic UI", "Segoe UI", sans-serif;
  background: linear-gradient(160deg, var(--bg-0), var(--bg-1));
  background-size: 140% 140%;
  animation: back-float 16s ease-in-out infinite alternate;
}

.stage {
  width: min(920px, calc(100vw - 2rem));
  margin: 0 auto;
  padding: 2rem 0 4rem;
  display: grid;
  gap: 1.15rem;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(14, 18, 28, 0.78);
  backdrop-filter: blur(6px);
  padding: 1.15rem;
}

.hero {
  text-align: center;
}

.tag {
  margin: 0;
  letter-spacing: 0.12em;
  color: var(--accent-b);
  font-size: 0.76rem;
}

.hero h1 {
  margin: 0.55rem 0;
  font-size: clamp(2.2rem, 8vw, 4.8rem);
  line-height: 1.05;
}

.line {
  margin: 0.25rem 0;
  font-size: clamp(1.1rem, 4vw, 1.8rem);
  color: #dbe4ff;
}

.chant h2 {
  margin: 0;
  color: var(--accent-a);
}

.chant ul {
  margin: 0.7rem 0 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.3rem;
}

.chant li {
  font-size: 1.08rem;
  animation: lyric-pop 1.2s ease both;
  opacity: 0.75;
  transition: opacity 120ms ease, transform 120ms ease, color 120ms ease;
}

.chant li:nth-child(2) { animation-delay: 0.18s; }
.chant li:nth-child(3) { animation-delay: 0.36s; }
.chant li:nth-child(4) { animation-delay: 0.54s; }

.chant li.active {
  opacity: 1;
  color: var(--accent-b);
  transform: translateX(4px);
}

.words {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
}

.words p {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.55rem 0.75rem;
  text-align: center;
  background: rgba(255, 255, 255, 0.04);
  transition: transform 160ms ease, background-color 160ms ease;
}

.words p:hover {
  transform: translateY(-2px);
  background: rgba(127, 178, 255, 0.16);
}

.story h2 {
  margin: 0 0 0.65rem;
  color: var(--accent-b);
}

.story p {
  margin: 0.7rem 0 0;
  line-height: 1.9;
  letter-spacing: 0.01em;
}

.count-line {
  margin-top: 0.8rem;
}

.beam-count {
  display: inline-block;
  margin-left: 0.25rem;
  padding: 0.08rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--accent-a);
  font-weight: 700;
}

.pulse {
  animation: panel-pulse 4.6s ease-in-out infinite;
}

@keyframes back-float {
  from { background-position: 0% 20%; }
  to { background-position: 100% 60%; }
}

@keyframes panel-pulse {
  0%, 100% { box-shadow: 0 0 0 rgba(127, 178, 255, 0); }
  50% { box-shadow: 0 0 22px rgba(127, 178, 255, 0.22); }
}

@keyframes lyric-pop {
  0% { opacity: 0; transform: translateY(8px); }
  100% { opacity: 1; transform: translateY(0); }
}

@media (max-width: 680px) {
  .words {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  body,
  .pulse,
  .chant li,
  .words p {
    animation: none;
    transition: none;
  }
}