* {
  box-sizing: border-box;
}

:root {
  --bg: #0b1018;
  --surface: #121a27;
  --surface-2: #1a2435;
  --text: #f3f6fc;
  --muted: #b8c1d4;
  --accent: #4fd1c5;
  --accent-2: #7dd3fc;
  --border: #2a3650;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Inter", "Helvetica Neue", Arial, sans-serif;
  background: radial-gradient(circle at top right, #15243f 0%, var(--bg) 48%);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: var(--accent-2);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px;
}

header {
  background: rgba(18, 26, 39, 0.88);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  z-index: 10;
}

.topbar {
  max-width: 1000px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-weight: 800;
  letter-spacing: 0.4px;
  color: var(--text);
}

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

nav {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

nav a {
  color: var(--text);
  font-size: 14px;
  opacity: 0.92;
}

.hero {
  padding: 54px 24px 24px;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.12;
}

.hero p {
  margin: 0;
  color: var(--muted);
  max-width: 760px;
}

.card-grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.card {
  background: linear-gradient(180deg, var(--surface) 0%, var(--surface-2) 100%);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
}

.card h3 {
  margin: 0 0 10px;
  font-size: 17px;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

section {
  margin-top: 30px;
  background: rgba(18, 26, 39, 0.72);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
}

section h2 {
  margin: 0 0 12px;
  font-size: 24px;
}

section h3 {
  margin: 20px 0 8px;
  font-size: 18px;
}

ul {
  padding-left: 20px;
}

li {
  margin: 8px 0;
}

footer {
  margin-top: 28px;
  border-top: 1px solid var(--border);
  padding: 18px 0 28px;
  color: var(--muted);
  font-size: 13px;
}

.badge {
  display: inline-block;
  background: rgba(79, 209, 197, 0.12);
  border: 1px solid rgba(79, 209, 197, 0.34);
  color: var(--accent);
  border-radius: 999px;
  font-size: 12px;
  padding: 3px 10px;
  margin-bottom: 10px;
}

.notice {
  border-left: 3px solid var(--accent);
  padding-left: 10px;
  color: var(--muted);
  font-size: 14px;
}

/* Mobile Responsive Styles */
@media (max-width: 768px) {
  .container {
    padding: 16px;
  }

  .topbar {
    padding: 12px 16px;
    gap: 12px;
    flex-wrap: wrap;
  }

  .brand {
    font-size: 18px;
  }

  nav {
    width: 100%;
    gap: 12px;
    order: 3;
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  nav a {
    font-size: 13px;
    padding: 4px 8px;
  }

  .hero {
    padding: 32px 16px 16px;
  }

  .hero h1 {
    font-size: clamp(24px, 6vw, 32px);
  }

  .hero p {
    font-size: 14px;
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .card {
    padding: 14px;
  }

  section {
    padding: 16px;
    margin-top: 20px;
  }

  section h2 {
    font-size: 20px;
  }

  section h3 {
    font-size: 16px;
  }

  ul {
    padding-left: 18px;
  }

  li {
    margin: 6px 0;
    font-size: 14px;
  }

  footer {
    font-size: 12px;
    text-align: center;
  }

  footer div {
    margin: 8px 0;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 12px;
  }

  .topbar {
    padding: 10px 12px;
  }

  .brand {
    font-size: 16px;
  }

  nav a {
    font-size: 12px;
    padding: 3px 6px;
  }

  .hero {
    padding: 24px 12px 12px;
  }

  .hero h1 {
    font-size: 20px;
    margin-bottom: 8px;
  }

  .badge {
    font-size: 11px;
    padding: 2px 8px;
  }

  .card {
    padding: 12px;
  }

  .card h3 {
    font-size: 15px;
  }

  .card p {
    font-size: 13px;
  }

  section {
    padding: 12px;
  }

  section h2 {
    font-size: 18px;
  }
}