:root {
  color-scheme: light;
  --ink: #172f43;
  --muted: #60717e;
  --accent: #246554;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 280px;
  min-height: 100svh;
  color: var(--ink);
  background: #f6f7f4;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

.page {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  min-height: 100svh;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 82% 18%, #dbe9e2a6 0%, transparent 46%),
    radial-gradient(ellipse at 10% 84%, #e0e9f2a1 0%, transparent 43%);
}

.orbit {
  position: absolute;
  z-index: -1;
  top: 50%;
  left: 50%;
  width: min(970px, 110vw);
  aspect-ratio: 1;
  border: 1px solid #253f5210;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.orbit::after {
  content: "";
  position: absolute;
  inset: 70px;
  border: 1px solid #253f520b;
  border-radius: inherit;
}

header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 32px 40px;
  font-size: 16px;
  font-weight: 650;
  letter-spacing: -.3px;
}

main {
  flex: 1;
  display: grid;
  place-items: center;
  padding: 48px 24px 80px;
  text-align: center;
}

.welcome { width: 100%; max-width: 960px; }

.greeting {
  margin: 0 0 15px;
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 500;
  letter-spacing: .14em;
  padding-left: .14em;
}

h1 {
  margin: 0;
  font-size: clamp(38px, 5.3vw, 68px);
  line-height: 1.16;
  font-weight: 650;
  letter-spacing: -.055em;
  text-wrap: balance;
}

h1 span { color: var(--accent); white-space: nowrap; }

.english-welcome {
  margin: 19px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: .015em;
}

.divider {
  width: 40px;
  height: 1px;
  margin: 38px auto 28px;
  background: #9bafa5;
}

.instruction {
  margin: 0;
  font-size: 17px;
  font-weight: 450;
  line-height: 1.7;
  letter-spacing: .03em;
}

.english-instruction {
  margin: 7px auto 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
  text-wrap: balance;
}

.email {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 56px;
  margin-top: 26px;
  padding: 15px 25px;
  border: 1px solid #172f43;
  border-radius: 14px;
  color: #fff;
  background: var(--ink);
  box-shadow: 0 6px 18px #172f4312;
  text-decoration: none;
  font-size: 17px;
  font-weight: 500;
  letter-spacing: .01em;
  transition: background .2s ease, box-shadow .2s ease, transform .2s ease;
}

.email svg { width: 19px; height: 19px; flex-shrink: 0; }
.email:hover { background: #24495c; transform: translateY(-2px); box-shadow: 0 10px 24px #172f431b; }
.email:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }

footer {
  padding: 0 24px 25px;
  color: #6e7f86;
  text-align: center;
  font-size: 10px;
  letter-spacing: .23em;
}

@media (max-width: 600px) {
  header { padding: 24px; font-size: 15px; }
  main { padding: 35px 22px 56px; }
  h1 { max-width: 430px; margin-inline: auto; line-height: 1.2; }
  .english-welcome { font-size: 13px; margin-top: 16px; }
  .divider { margin-top: 30px; margin-bottom: 24px; }
  .instruction { font-size: 16px; }
  .english-instruction { max-width: 300px; font-size: 13px; }
  .email { font-size: 16px; }
  .orbit { width: 720px; }
}

@media (prefers-reduced-motion: reduce) {
  .email { transition: none; }
  .email:hover { transform: none; }
}