:root {
  color-scheme: dark;
  --bg: #03060b;
  --ink: #d9f7ff;
  --muted: #86a4b4;
  --cyan: #00e5ff;
  --green: #3dffa8;
  --line: rgba(0, 229, 255, 0.22);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100svh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 48px 16px;
  color: var(--ink);
  font: 1rem/1.7 var(--mono);
  background:
    radial-gradient(circle at 50% 38%, rgba(0, 229, 255, 0.1), transparent 62%),
    linear-gradient(rgba(0, 229, 255, 0.045) 1px, transparent 1px) 0 0 / 40px 40px,
    linear-gradient(90deg, rgba(0, 229, 255, 0.045) 1px, transparent 1px) 0 0 / 40px 40px,
    var(--bg);
}

main {
  width: min(100%, 640px);
  text-align: center;
}

.logo {
  height: 56px;
  width: auto;
  mix-blend-mode: screen;
  /* ロゴの地の暗い四角を背景に溶かす */
  filter: contrast(1.35);
}

h1 {
  margin: 20px 0 36px;
  font-size: clamp(2rem, 9.2vw, 4.4rem);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: 0.08em;
  color: var(--cyan);
  text-shadow: 0 0 8px rgba(0, 229, 255, 0.75), 0 0 28px rgba(0, 229, 255, 0.4);
}

.title {
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  letter-spacing: inherit;
  text-shadow: inherit;
  cursor: pointer;
}

.title:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 6px;
}

.poem {
  margin: 0 0 22px;
  font-size: clamp(0.82rem, 3.6vw, 1.15rem);
  text-wrap: balance;
}

.soon {
  margin: 36px 0;
  font-size: clamp(1.15rem, 4.4vw, 1.45rem);
  color: var(--green);
  text-shadow: 0 0 12px rgba(61, 255, 168, 0.55);
}

.sample {
  position: relative;
  width: min(100%, 320px);
  margin: 0 auto 36px;
}

.sample video {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 16;
  background: #000;
  box-shadow: 0 0 0 1px var(--line), 0 0 28px rgba(0, 229, 255, 0.18);
}

.sample button {
  position: absolute;
  top: 74%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 12px 18px;
  border: 1px solid var(--cyan);
  background: rgba(3, 6, 11, 0.88);
  color: var(--cyan);
  font: 600 0.9rem var(--mono);
  white-space: nowrap;
  cursor: pointer;
}

.sample button:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
}

.sample figcaption {
  margin-top: 10px;
  font-size: 0.75rem;
  color: var(--muted);
}

.facts {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 22px;
  margin: 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
  color: var(--muted);
}