:root {
  --bg: #0f1115;
  --panel: #171b22;
  --panel-2: #1d2330;
  --text: #e8edf5;
  --muted: #aab4c4;
  --line: #2a3240;
  --accent: #7fb3ff;
  --accent-2: #9fd1ff;
  --max: 980px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(180deg, #0c0f14 0%, #10151d 100%);
  color: var(--text);
  line-height: 1.6;
}

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

a:hover {
  text-decoration: underline;
}

header {
  border-bottom: 1px solid var(--line);
  background: rgba(15, 17, 21, 0.92);
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  z-index: 10;
}

.nav-wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  gap: 18px;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.brand {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

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

nav a {
  padding: 8px 12px;
  border: 1px solid transparent;
  border-radius: 10px;
}

nav a:hover,
nav a.active {
  background: var(--panel-2);
  border-color: var(--line);
  text-decoration: none;
}

.hero,
.content {
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px 20px;
}

.hero {
  padding-top: 54px;
  padding-bottom: 28px;
}

.hero-card,
.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.00)), var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.22);
}

.hero-card {
  padding: 32px;
}

.hero h1,
.content h1 {
  margin-top: 0;
  font-size: 2rem;
  line-height: 1.2;
}

.subtitle {
  color: var(--muted);
  max-width: 700px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.card {
  padding: 22px;
}

.card h2,
.card h3 {
  margin-top: 0;
}

.notice {
  margin-top: 24px;
  padding: 16px 18px;
  border-left: 4px solid var(--accent);
  background: rgba(127, 179, 255, 0.08);
  border-radius: 12px;
  color: var(--text);
}

.content .card {
  padding: 30px;
}

.content h2 {
  margin-top: 28px;
}

.content ul,
.content ol {
  padding-left: 22px;
}

.content li + li {
  margin-top: 8px;
}

footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 18px 20px 34px;
  color: var(--muted);
}

.small {
  color: var(--muted);
  font-size: 0.95rem;
}

.badge-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.badge {
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 0.92rem;
}

@media (max-width: 640px) {
  .hero h1,
  .content h1 {
    font-size: 1.6rem;
  }

  .hero-card,
  .content .card {
    padding: 22px;
  }
}