:root {
  --color-bg: #0a0e17;
  --color-surface: #111827;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-text: #e5e7eb;
  --color-muted: #9ca3af;
  --color-accent: #3b82f6;
  --color-accent-soft: rgba(59, 130, 246, 0.15);
  --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --max-width: 960px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(59, 130, 246, 0.18), transparent),
    radial-gradient(ellipse 60% 40% at 100% 100%, rgba(99, 102, 241, 0.1), transparent);
  pointer-events: none;
  z-index: 0;
}

header,
main,
footer {
  position: relative;
  z-index: 1;
}

header {
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
  background: rgba(10, 14, 23, 0.8);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--color-muted);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s;
}

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

.lang-switch {
  display: flex;
  gap: 0.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  padding: 0.25rem;
}

.lang-switch a {
  padding: 0.25rem 0.625rem;
  border-radius: 0.375rem;
  font-size: 0.8125rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--color-muted);
  transition: background 0.2s, color 0.2s;
}

.lang-switch a.active,
.lang-switch a:hover {
  background: var(--color-accent-soft);
  color: var(--color-accent);
}

main {
  flex: 1;
}

.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 5rem 1.5rem 4rem;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  background: var(--color-accent-soft);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 999px;
  font-size: 0.8125rem;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.125rem;
  color: var(--color-muted);
  max-width: 36rem;
  margin: 0 auto 2rem;
}

.hero-domain {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-accent);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
}

.hero-domain:hover {
  text-decoration: underline;
}

section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.section-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

section h2 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

section p {
  color: var(--color-muted);
  margin-bottom: 1rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: 1.5rem;
}

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.card p {
  font-size: 0.9375rem;
  margin-bottom: 0;
}

.contact-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: 2rem;
  margin-top: 1rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.contact-item:last-child {
  margin-bottom: 0;
}

.contact-label {
  font-size: 0.8125rem;
  color: var(--color-muted);
  min-width: 4rem;
}

.contact-value {
  color: var(--color-text);
  text-decoration: none;
}

.contact-value:hover {
  color: var(--color-accent);
}

footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 1.5rem;
  text-align: center;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

footer p {
  font-size: 0.8125rem;
  color: var(--color-muted);
  margin-bottom: 0.5rem;
}

.footer-records {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  font-size: 0.8125rem;
}

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

footer a:hover {
  color: var(--color-accent);
}

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

  .nav-links {
    width: 100%;
    justify-content: space-between;
  }

  .hero {
    padding-top: 3rem;
  }
}