:root {
  color-scheme: light;
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --bg: #f8fafc;
  --text: #0f172a;
  --muted: #64748b;
  --card: #ffffff;
  --border: #e2e8f0;
  --shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
}

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

body {
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
}

.logo img {
  width: 36px;
  height: 36px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav a {
  color: var(--muted);
  font-weight: 500;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
}

.btn {
  padding: 10px 18px;
  border-radius: 999px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 12px 24px rgba(37, 99, 235, 0.25);
}

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

.btn-outline {
  border: 1px solid var(--primary);
  color: var(--primary);
}

.hero {
  padding: 80px 0 60px;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  align-items: center;
  gap: 40px;
}

.hero-text h1 {
  font-size: clamp(32px, 4vw, 46px);
  margin: 12px 0 16px;
}

.badge {
  display: inline-flex;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--primary-dark);
  font-size: 14px;
  font-weight: 600;
}

.lead {
  color: var(--muted);
  font-size: 18px;
}

.hero-actions {
  margin: 26px 0 24px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
}

.hero-metrics strong {
  font-size: 20px;
  display: block;
}

.hero-metrics span {
  color: var(--muted);
  font-size: 14px;
}

.section {
  padding: 70px 0;
}

.section.alt {
  background: #f1f5f9;
}

.section h2 {
  font-size: 30px;
  margin-bottom: 26px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 26px;
  box-shadow: var(--shadow);
}

.card.soft {
  background: #f8fafc;
}

.card h3 {
  margin-bottom: 12px;
}

.list {
  margin-top: 14px;
  padding-left: 20px;
  color: var(--muted);
}

.list li {
  margin-bottom: 8px;
}

.two-column {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 24px;
  list-style: none;
}

.steps li {
  background: var(--card);
  border-radius: 18px;
  padding: 20px;
  border: 1px solid var(--border);
}

.steps h4 {
  margin-bottom: 8px;
}

.values {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.page-hero {
  padding: 60px 0 40px;
  background: linear-gradient(135deg, #e0f2fe, #f8fafc);
}

.page-hero h1 {
  font-size: 36px;
  margin-bottom: 10px;
}

.prose h2 {
  margin-top: 24px;
}

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

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

.form {
  display: grid;
  gap: 16px;
}

.form label {
  display: grid;
  gap: 6px;
  font-weight: 500;
}

.form input,
.form textarea {
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 15px;
  font-family: inherit;
}

.form-note {
  color: var(--muted);
  font-size: 13px;
}

.form-status {
  margin-top: 16px;
  font-weight: 600;
}

.form-status.success {
  color: #16a34a;
}

.form-status.error {
  color: #dc2626;
}

.divider {
  height: 1px;
  background: var(--border);
  margin: 20px 0;
}

.site-footer {
  background: #0f172a;
  color: #e2e8f0;
  padding: 50px 0 20px;
}

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

.site-footer a {
  color: #cbd5f5;
}

.site-footer ul {
  list-style: none;
  display: grid;
  gap: 8px;
}

.copyright {
  padding-top: 20px;
  font-size: 13px;
  color: #94a3b8;
}

@media (max-width: 860px) {
  .nav {
    position: absolute;
    top: 70px;
    right: 16px;
    background: #fff;
    border: 1px solid var(--border);
    padding: 16px;
    border-radius: 16px;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    display: none;
    box-shadow: var(--shadow);
  }

  .nav.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }
}