:root {
  color-scheme: dark;
  --bg: #07091e;
  --panel: rgba(255, 255, 255, 0.08);
  --panel-strong: rgba(255, 255, 255, 0.12);
  --text: #f4f8ff;
  --muted: rgba(244, 248, 255, 0.72);
  --line: rgba(255, 255, 255, 0.16);
  --cyan: #16e4ff;
  --pink: #ff4fb8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 12% 18%, rgba(22, 228, 255, 0.22), transparent 32rem),
    radial-gradient(circle at 86% 32%, rgba(255, 79, 184, 0.2), transparent 30rem),
    linear-gradient(145deg, #07091e 0%, #120726 52%, #051f2c 100%);
  color: var(--text);
  line-height: 1.65;
}

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

.shell {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 42px 0 56px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 48px;
}

.brand {
  color: var(--cyan);
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 0;
  text-decoration: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.nav a {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.06);
}

.hero {
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--cyan);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0;
  font-size: 0.78rem;
}

h1 {
  margin: 0;
  max-width: 820px;
  font-size: clamp(2.4rem, 8vw, 5.4rem);
  line-height: 1.04;
}

h2 {
  margin: 0 0 12px;
  font-size: 1.35rem;
}

p {
  margin: 0 0 14px;
  color: var(--muted);
}

ul {
  margin: 12px 0 0;
  padding-left: 1.4rem;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
  margin-top: 26px;
}

.card,
.section {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.24);
}

.card {
  min-height: 160px;
  padding: 20px;
  text-decoration: none;
  color: var(--text);
}

.card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 1.08rem;
}

.section {
  padding: 22px;
  margin: 16px 0;
}

.notice {
  border-color: rgba(255, 79, 184, 0.38);
  background: rgba(255, 79, 184, 0.1);
}

.meta {
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: rgba(244, 248, 255, 0.6);
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav a {
    font-size: 0.92rem;
  }
}