:root {
  color-scheme: dark;
  --bg: #030714;
  --panel: rgba(8, 17, 37, 0.88);
  --line: rgba(70, 216, 255, 0.28);
  --cyan: #55dcff;
  --mint: #77f2b6;
  --text: #f2f7ff;
  --muted: #9eb0c7;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.75;
  background:
    radial-gradient(circle at 18% 12%, rgba(62, 86, 255, 0.18), transparent 32rem),
    radial-gradient(circle at 92% 28%, rgba(0, 218, 255, 0.12), transparent 28rem),
    var(--bg);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.22;
  background-image:
    radial-gradient(circle, #fff 0 1px, transparent 1.5px),
    radial-gradient(circle, #55dcff 0 1px, transparent 1.5px);
  background-position: 0 0, 42px 38px;
  background-size: 83px 83px, 131px 131px;
}

a { color: var(--cyan); }
a:hover { color: var(--mint); }

.shell {
  position: relative;
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 72px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 0 26px;
}

.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.brand span { color: var(--cyan); }

nav { display: flex; gap: 18px; font-size: 14px; }
nav a { color: var(--muted); text-decoration: none; }

.hero, .card {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 22px 80px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(18px);
}

.hero {
  padding: clamp(30px, 7vw, 68px);
  border-radius: 30px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--mint);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.2em;
}

h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(34px, 7vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.lead { max-width: 700px; margin: 20px 0 0; color: var(--muted); font-size: 17px; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.button {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 10px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  background: rgba(17, 37, 70, 0.72);
}

.button.primary { color: #021019; border-color: transparent; background: var(--mint); }

.content { display: grid; gap: 18px; margin-top: 18px; }

.card { padding: clamp(24px, 5vw, 42px); border-radius: 24px; }

h2 { margin: 0 0 14px; font-size: 24px; }
h3 { margin: 24px 0 8px; font-size: 18px; }
p, li { color: #cad5e4; }
ul { padding-left: 1.3em; }
.meta { color: var(--muted); font-size: 13px; }
.notice { padding: 16px 18px; border-left: 3px solid var(--mint); background: rgba(119, 242, 182, 0.07); }

footer { padding: 28px 4px 0; color: var(--muted); font-size: 12px; }

@media (max-width: 620px) {
  header { align-items: flex-start; flex-direction: column; }
  nav { width: 100%; justify-content: space-between; }
  .shell { width: min(100% - 22px, 920px); padding-top: 14px; }
  .hero { border-radius: 22px; }
  .card { border-radius: 20px; }
}