:root {
  --bg: #081022;
  --panel: rgba(20, 35, 62, 0.72);
  --line: rgba(120, 160, 255, 0.28);
  --text: #ecf3ff;
  --muted: #9eb4d9;
  --primary: #4dd4ac;
  --primary-dark: #32b08c;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: radial-gradient(90rem 50rem at 10% 10%, #132d5a 0%, transparent 60%),
    radial-gradient(70rem 50rem at 100% 0%, #12324f 0%, transparent 52%),
    var(--bg);
  font-family: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(to right, rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at center, black 45%, transparent 100%);
}

.header,
.main,
.footer {
  width: min(1080px, 92vw);
  margin-inline: auto;
  position: relative;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.1rem 0;
}

.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.02em;
}

nav {
  display: flex;
  align-items: center;
  gap: 1rem;
}

nav a {
  color: var(--muted);
  text-decoration: none;
}

.main {
  padding: 2rem 0 3rem;
}

.hero {
  padding: 2rem;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
  backdrop-filter: blur(6px);
}

.tag {
  display: inline-block;
  font-size: 0.8rem;
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
}

h1 {
  margin: 0.9rem 0 0.4rem;
  font-size: clamp(1.8rem, 3.8vw, 3rem);
}

.subtitle {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
  max-width: 56ch;
}

.actions {
  display: flex;
  gap: 0.8rem;
  margin-top: 1.25rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--text);
  text-decoration: none;
}

.btn.primary {
  background: var(--primary);
  color: #042013;
  border-color: transparent;
  font-weight: 600;
}

.btn.primary:hover {
  background: var(--primary-dark);
}

.cards {
  margin-top: 1.2rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
}

.card,
.quickstart,
.pricing {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
  padding: 1rem;
}

.card h3 {
  margin: 0.1rem 0 0.5rem;
}

.card p,
.pricing p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.quickstart,
.pricing {
  margin-top: 0.9rem;
}

pre {
  overflow: auto;
  margin: 0;
  padding: 0.8rem;
  border-radius: 10px;
  background: #081628;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.footer {
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.2rem 0 2rem;
}

.footer a {
  color: var(--muted);
}

@media (max-width: 820px) {
  .cards {
    grid-template-columns: 1fr;
  }

  .header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.8rem;
  }
}