:root {
  --bg: #0f0f12;
  --bg-muted: #16161c;
  --card: #1c1c24;
  --text: #e2e8f0;
  --text-muted: rgba(255, 255, 255, 0.62);
  --primary: #7c6cf0;
  --primary-soft: rgba(124, 108, 240, 0.18);
  --border: rgba(255, 255, 255, 0.1);
  --radius: 16px;
  --max: 960px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}

a {
  color: #a99cff;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
}

.header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  background: rgba(15, 15, 18, 0.85);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 16px;
}

.logo {
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: 0.04em;
  color: #fff;
  text-decoration: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.9375rem;
}

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

.nav a:hover {
  color: #fff;
}

.hero {
  padding: 72px 0 56px;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(124, 108, 240, 0.28), transparent),
    var(--bg);
}

.hero-inner {
  text-align: center;
}

.badge {
  display: inline-block;
  margin: 0 0 16px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--primary-soft);
  border: 1px solid rgba(124, 108, 240, 0.35);
  color: #cfc6ff;
  font-size: 0.875rem;
}

.hero h1 {
  margin: 0 0 20px;
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.lead {
  max-width: 640px;
  margin: 0 auto 28px;
  color: var(--text-muted);
  font-size: 1.0625rem;
}

.hero-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
}

.btn-primary {
  background: rgba(124, 108, 240, 0.85);
  color: #fff;
  border: 1px solid rgba(124, 108, 240, 0.9);
}

.btn-ghost {
  color: var(--text);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
}

.section {
  padding: 56px 0;
}

.section-muted {
  background: var(--bg-muted);
}

.section h2,
.legal h1 {
  margin: 0 0 20px;
  font-size: 1.75rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  align-items: start;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.card h3 {
  margin: 0 0 12px;
  font-size: 1.125rem;
}

.info-list {
  list-style: none;
  padding: 0;
  margin: 20px 0 0;
}

.info-list li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9375rem;
}

.info-list span {
  color: var(--text-muted);
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.feature {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.feature h3 {
  margin: 0 0 10px;
  color: #cfc6ff;
}

.note {
  color: var(--text-muted);
  font-size: 0.9375rem;
}

.contact .small {
  color: var(--text-muted);
  font-size: 0.8125rem;
}

.footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.legal {
  padding: 48px 0 64px;
}

.legal h1 {
  font-size: 2rem;
}

.legal h2 {
  margin-top: 32px;
  font-size: 1.25rem;
}

.legal p,
.legal li {
  color: var(--text-muted);
}

.legal ul {
  padding-left: 1.25rem;
}

.updated {
  font-size: 0.875rem;
}

code {
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.875em;
}

.back {
  margin-top: 40px;
}

@media (max-width: 640px) {
  .nav {
    gap: 12px;
    font-size: 0.875rem;
  }

  .hero {
    padding-top: 48px;
  }
}