:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #1c2333;
  --muted: #5a657d;
  --brand: #165dff;
  --brand-dark: #0f46c7;
  --line: #dbe3f3;
  --shadow: 0 14px 40px rgba(22, 93, 255, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color: var(--text);
  background: var(--bg);
}

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

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(8px);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: linear-gradient(140deg, #165dff 0%, #36a3ff 100%);
  color: #fff;
  font-size: 14px;
  letter-spacing: 0.4px;
}

.brand-text {
  font-size: 16px;
}

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

.nav a {
  color: var(--muted);
  font-size: 14px;
}

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

.hero {
  padding: 72px 0 40px;
  background:
    radial-gradient(circle at 15% 10%, rgba(22, 93, 255, 0.16) 0, transparent 45%),
    radial-gradient(circle at 88% 10%, rgba(54, 163, 255, 0.12) 0, transparent 38%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
  align-items: center;
}

.kicker {
  margin: 0 0 10px;
  color: var(--brand);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.3px;
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(30px, 4.4vw, 46px);
  line-height: 1.2;
}

.lead {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.hero-actions {
  margin-top: 26px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
}

.btn-primary {
  background: var(--brand);
  color: #fff;
}

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

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

.btn-ghost:hover {
  border-color: #bfd0f9;
  color: var(--brand);
}

.hero-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-card h2 {
  margin: 0 0 14px;
  font-size: 20px;
}

.hero-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.hero-card li {
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.hero-card li:last-child {
  border-bottom: 0;
}

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

.hero-card strong {
  text-align: right;
  font-size: 14px;
}

.section {
  padding: 66px 0;
}

.section-alt {
  background: #eef3ff;
}

h2 {
  margin: 0 0 16px;
  font-size: 30px;
}

h3 {
  margin: 0 0 10px;
  font-size: 19px;
}

.section p {
  line-height: 1.85;
  color: #3d4862;
}

.cards {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.card {
  padding: 20px;
  border-radius: 14px;
  border: 1px solid #d7e2fb;
  background: #fff;
}

.card p {
  margin: 0;
}

.scope-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.scope-card {
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 20px;
}

.scope-card ul {
  margin: 0;
  padding-left: 18px;
  color: #3d4862;
  line-height: 1.8;
}

.note {
  margin-top: 12px;
  font-size: 14px;
  color: var(--muted);
}

.contact-box {
  margin-top: 16px;
  background: #fff;
  border: 1px solid #d4e0fd;
  border-radius: 12px;
  padding: 18px;
}

.contact-box p {
  margin: 6px 0;
}

.site-footer {
  background: #111827;
  color: #d0d7e6;
  padding: 24px 0 30px;
}

.footer-wrap {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
}

.footer-wrap p {
  margin: 0;
  font-size: 14px;
}

.icp a {
  color: #c9d8ff;
}

.icp a:hover {
  color: #ffffff;
  text-decoration: underline;
}

@media (max-width: 920px) {
  .hero-grid,
  .scope-grid,
  .cards {
    grid-template-columns: 1fr;
  }

  .brand-text {
    display: none;
  }

  h2 {
    font-size: 26px;
  }
}

@media (max-width: 640px) {
  .nav-wrap {
    min-height: 64px;
  }

  .nav {
    gap: 12px;
  }

  .nav a {
    font-size: 13px;
  }

  .hero {
    padding-top: 54px;
  }

  .section {
    padding: 54px 0;
  }
}