:root {
  color-scheme: dark;
  font-family: Inter, "Noto Sans JP", system-ui, sans-serif;
  --background: #050b0f;
  --panel: #0d181d;
  --line: #294048;
  --text: #effbf5;
  --muted: #829a91;
  --accent: #8ce3ad;
  --accent-bright: #c5ffdb;
  --blue: #69cbea;
}

* { box-sizing: border-box; }

html,
body {
  min-height: 100%;
  margin: 0;
  background: var(--background);
  color: var(--text);
}

body { min-height: 100vh; }

.landing {
  position: relative;
  display: grid;
  min-height: 100vh;
  place-items: center;
  overflow: hidden;
  isolation: isolate;
  background:
    linear-gradient(180deg, #071117b8, #05090df2),
    radial-gradient(circle at 50% 25%, #17343b 0, transparent 48%);
}

.landing__grid {
  position: absolute;
  z-index: -3;
  inset: -20%;
  opacity: .2;
  transform: perspective(650px) rotateX(62deg) translateY(22%);
  background-image:
    linear-gradient(#54717a44 1px, transparent 1px),
    linear-gradient(90deg, #54717a44 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(circle, #000 10%, transparent 68%);
}

.landing__glow {
  position: absolute;
  z-index: -2;
  width: 420px;
  height: 420px;
  border: 1px solid #73c99b26;
  filter: blur(1px);
  opacity: .55;
  transform: rotate(30deg);
}

.landing__glow::before,
.landing__glow::after {
  position: absolute;
  content: "";
  inset: 16%;
  border: 1px solid #6cb98f22;
}

.landing__glow::after { inset: 32%; }
.landing__glow--left { left: -260px; top: 8%; }
.landing__glow--right { right: -260px; bottom: 4%; }

.hero {
  width: min(760px, calc(100% - 40px));
  padding: 48px 52px;
  text-align: center;
  border: 1px solid #38525b7d;
  border-radius: 4px;
  background: linear-gradient(145deg, #101d23e8, #091217db);
  box-shadow: 0 32px 100px #000b, inset 0 1px #9be8bd16;
  clip-path: polygon(28px 0, calc(100% - 28px) 0, 100% 28px, 100% calc(100% - 28px), calc(100% - 28px) 100%, 28px 100%, 0 calc(100% - 28px), 0 28px);
}

.hero__eyebrow {
  margin: 0 0 17px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .28em;
}

.hero h1 {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 17px;
  margin: 0;
  font-size: clamp(25px, 5vw, 50px);
  line-height: .95;
  letter-spacing: -.04em;
  text-shadow: 0 0 30px #76dba342;
}

.hero h1 span:last-child { color: var(--accent-bright); }

.hero h1 small {
  color: var(--blue);
  font-size: .48em;
  font-weight: 400;
}

.hero__description {
  max-width: 560px;
  margin: 24px auto 31px;
  color: #a9beb5;
  font-size: 13px;
  line-height: 1.9;
}

.game-start {
  position: relative;
  display: grid;
  width: min(360px, 100%);
  min-height: 76px;
  margin: 0 auto;
  place-content: center;
  border: 1px solid #85daa7;
  border-radius: 3px;
  background: linear-gradient(120deg, #1a5737, #28704a);
  box-shadow: 0 10px 36px #153e2b99, inset 0 1px #d9ffe650;
  color: #f0fff5;
  text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}

.game-start:hover,
.game-start:focus-visible {
  background: linear-gradient(120deg, #237147, #33905e);
  box-shadow: 0 14px 48px #1f6c4599, inset 0 1px #e7ffed6e;
  outline: none;
  transform: translateY(-2px);
}

.game-start small {
  color: #bfe9cf;
  font-size: 8px;
  font-weight: 800;
  letter-spacing: .2em;
}

.game-start strong {
  margin-top: 3px;
  font-size: 23px;
  letter-spacing: .12em;
}

.game-start > span {
  position: absolute;
  right: 20px;
  top: 50%;
  font-size: 30px;
  transform: translateY(-54%);
}

.hero__status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 25px;
  color: var(--muted);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: .13em;
}

.hero__status i {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: #5f8273;
}

.landing__footer {
  position: absolute;
  right: 22px;
  bottom: 16px;
  left: 22px;
  display: flex;
  justify-content: space-between;
  color: #566d65;
  font-size: 8px;
  font-weight: 800;
  letter-spacing: .15em;
}

@media (max-width: 680px) {
  .hero { padding: 40px 24px; }
  .hero h1 { flex-direction: column; gap: 8px; }
  .hero h1 small { font-size: 18px; }
  .hero__description { font-size: 12px; }
  .hero__status { gap: 7px; }
}