:root {
  color-scheme: dark;
  font-family: "Yu Gothic", YuGothic, "Hiragino Kaku Gothic ProN", Meiryo,
    sans-serif;
  background: #07131d;
  color: #f7faf7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 50% 8%, rgb(23 60 80 / 88%), transparent 34rem),
    #07131d;
}

a {
  color: inherit;
}

.landing-shell {
  min-height: 100svh;
  display: grid;
  place-items: start center;
  padding: clamp(1rem, 5vw, 2.5rem) 1rem 3rem;
}

.landing-card {
  width: min(100%, 34rem);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
  text-align: center;
}

.eyebrow {
  color: #8ee9e4;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}

h1 {
  margin: 0;
  font-size: clamp(1.45rem, 6vw, 2.15rem);
  line-height: 1.3;
  letter-spacing: 0.02em;
}

.intro {
  margin: 0 0 0.35rem;
  color: #aec4cd;
  font-size: 0.95rem;
  line-height: 1.7;
}

.image-link {
  display: block;
  width: 100%;
  border-radius: 1.65rem;
}

.image-link:focus-visible,
.channel-button:focus-visible {
  outline: 3px solid #43d8d0;
  outline-offset: 4px;
}

.landing-image {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgb(67 216 208 / 32%);
  border-radius: 1.65rem;
  box-shadow: 0 1.5rem 5rem rgb(0 0 0 / 30%);
}

.channel-button {
  width: 100%;
  min-height: 3.65rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  margin-top: 0.4rem;
  padding: 0.9rem 1.25rem;
  border-radius: 999px;
  background: #e83b35;
  color: #fff;
  font-size: 1.05rem;
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 0.8rem 2.2rem rgb(232 59 53 / 28%);
  transition: transform 160ms ease, filter 160ms ease;
}

.channel-button:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

.channel-button:active {
  transform: translateY(1px);
}

.trust-note {
  max-width: 31rem;
  margin: 0.2rem 0 0;
  color: #aec4cd;
  font-size: 0.76rem;
  line-height: 1.7;
}

@media (max-width: 420px) {
  .landing-shell {
    padding-inline: 0.75rem;
  }

  .landing-image,
  .image-link {
    border-radius: 1.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .channel-button {
    transition: none;
  }
}