:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --ink: #132033;
  --muted: #667085;
  --line: #d9e2ee;
  --brand: #0f766e;
  --brand-dark: #115e59;
  --accent: #1d4ed8;
  --warn: #92400e;
  --shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}

body {
  margin: 0;
}

a {
  color: inherit;
}

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

.nav {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  text-decoration: none;
  letter-spacing: 0;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, #0f766e, #1d4ed8);
}

.nav-links {
  display: flex;
  gap: 18px;
  align-items: center;
  font-size: 15px;
  color: var(--muted);
}

.nav-links a {
  text-decoration: none;
}

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

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

.hero {
  padding: 76px 0 56px;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
  gap: 40px;
  align-items: center;
}

.eyebrow {
  color: var(--brand);
  font-weight: 800;
  margin: 0 0 14px;
}

h1 {
  font-size: clamp(40px, 6vw, 68px);
  line-height: 1.05;
  letter-spacing: 0;
  margin: 0 0 22px;
}

h2 {
  font-size: 30px;
  line-height: 1.2;
  margin: 0 0 18px;
}

h3 {
  font-size: 20px;
  margin: 0 0 8px;
}

p {
  margin: 0 0 16px;
}

.lead {
  font-size: 21px;
  color: var(--muted);
  max-width: 720px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: var(--brand);
  color: #fff;
  font-weight: 800;
  text-decoration: none;
}

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

.button.secondary {
  background: #fff;
  color: var(--ink);
  border-color: var(--line);
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 26px;
}

.trust-list {
  display: grid;
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.trust-list li {
  display: flex;
  gap: 10px;
  color: var(--muted);
}

.trust-list li::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--brand);
  flex: 0 0 auto;
  margin-top: 9px;
}

.section {
  padding: 42px 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

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

.muted {
  color: var(--muted);
}

.notice {
  background: #fffbeb;
  color: var(--warn);
  border: 1px solid #fde68a;
  border-radius: 8px;
  padding: 18px;
}

.faq-list {
  display: grid;
  gap: 16px;
}

.faq-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 22px;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 30px 0;
  color: var(--muted);
  font-size: 14px;
}

.footer-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

@media (max-width: 820px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 0;
  }

  .nav-links {
    flex-wrap: wrap;
  }

  .hero,
  .grid,
  .tool-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 46px;
  }

  h1 {
    font-size: 42px;
  }
}