:root {
  --bg: #0b0f14;
  --bg-alt: #111820;
  --surface: #161d27;
  --text: #e8edf4;
  --text-muted: #9aa8bc;
  --accent: #6ee7b7;
  --accent-dim: rgba(110, 231, 183, 0.12);
  --border: rgba(255, 255, 255, 0.08);
  --max-width: 1080px;
  --radius: 12px;
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  width: min(100% - 2.5rem, var(--max-width));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border);
  background: rgba(11, 15, 20, 0.85);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}

.logo {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.logo:hover {
  color: var(--accent);
  text-decoration: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.nav a {
  color: var(--text-muted);
  font-size: 0.9375rem;
  text-decoration: none;
}

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

/* Hero */
.hero {
  padding: 7rem 0 6rem;
  background:
    radial-gradient(ellipse 80% 60% at 50% -20%, var(--accent-dim), transparent),
    var(--bg);
}

.hero-label {
  margin: 0 0 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero h1 {
  margin: 0 0 1.5rem;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.hero-desc {
  margin: 0 0 2.5rem;
  max-width: 36rem;
  font-size: 1.125rem;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.btn-primary {
  background: var(--accent);
  color: #0b0f14;
}

.btn-primary:hover {
  background: #5dd9a8;
  text-decoration: none;
}

.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-ghost:hover {
  border-color: var(--text-muted);
  text-decoration: none;
}

/* Sections */
.section {
  padding: 5.5rem 0;
}

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

.section-title {
  margin: 0 0 1rem;
  font-size: 1.75rem;
  font-weight: 700;
}

.section-lead {
  margin: 0 0 2.5rem;
  max-width: 32rem;
  color: var(--text-muted);
}

/* About */
.about-grid {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.about-card {
  padding: 1.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.about-card h3 {
  margin: 0 0 0.75rem;
  font-size: 1.0625rem;
}

.about-card p,
.about-card ul {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9375rem;
}

.about-card ul {
  padding-left: 1.25rem;
}

.about-card li + li {
  margin-top: 0.5rem;
}

/* Services */
.services-grid {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.service-card {
  padding: 1.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.service-num {
  display: block;
  margin-bottom: 0.75rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.08em;
}

.service-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.125rem;
}

.service-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9375rem;
}

/* Contact */
.contact-block {
  max-width: 40rem;
}

.contact-list {
  margin: 0 0 1.5rem;
  display: grid;
  gap: 1.25rem;
}

.contact-list dt {
  margin: 0 0 0.25rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.contact-list dd {
  margin: 0;
  font-size: 1rem;
}

.contact-note {
  padding: 1rem 1.25rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  background: var(--accent-dim);
  border-radius: var(--radius);
  border-left: 3px solid var(--accent);
}

.contact-note code {
  font-size: 0.8125rem;
  color: var(--accent);
}

/* Footer */
.site-footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
}

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

.footer-inner p {
  margin: 0.25rem 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

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

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

/* Legal pages */
.legal-page {
  padding: 6rem 0 4rem;
}

.legal-page h1 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
}

.legal-meta {
  margin: 0 0 2.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.legal-page h2 {
  margin: 2rem 0 0.75rem;
  font-size: 1.125rem;
}

.legal-page p,
.legal-page ul {
  color: var(--text-muted);
  font-size: 0.9375rem;
}

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

@media (max-width: 640px) {
  .nav {
    gap: 0.75rem;
    font-size: 0.875rem;
  }

  .hero {
    padding: 4.5rem 0 3.5rem;
  }

  .section {
    padding: 3.5rem 0;
  }
}