:root {
  --bg: #f3f6f2;
  --bg-alt: #e8efe4;
  --surface: #ffffff;
  --text: #1f2a24;
  --muted: #5c6b62;
  --accent: #2f6b45;
  --accent-dark: #1f4d31;
  --line: #d5e0d6;
  --radius: 12px;
  --shadow: 0 8px 24px rgba(31, 42, 36, 0.06);
  --max: 880px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(47, 107, 69, 0.08), transparent 40%),
    linear-gradient(180deg, #f7faf6 0%, var(--bg) 40%, #eef3ec 100%);
  line-height: 1.7;
}

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

a:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

.container {
  width: min(100% - 40px, var(--max));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(247, 250, 246, 0.9);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 16px;
}

.brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent-dark);
  text-decoration: none;
}

.nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.nav a {
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

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

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 10px 9px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  margin: 4px 0;
  background: var(--text);
}

.hero {
  padding: 72px 0 56px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 14px;
  letter-spacing: 0.08em;
}

.hero h1 {
  margin: 0;
  font-size: clamp(36px, 6vw, 52px);
  line-height: 1.15;
  color: var(--accent-dark);
}

.lead {
  margin: 16px 0 0;
  font-size: 20px;
  color: var(--text);
}

.hero-desc {
  margin: 18px 0 0;
  max-width: 640px;
  color: var(--muted);
}

.section {
  padding: 48px 0;
}

.section-alt {
  background: rgba(255, 255, 255, 0.55);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section h2 {
  margin: 0 0 20px;
  font-size: 28px;
  color: var(--accent-dark);
}

.section p {
  margin: 0 0 14px;
  color: var(--muted);
}

.feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.feature-list li {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 6px;
}

.feature-list strong {
  color: var(--text);
}

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

.note {
  margin-top: 18px !important;
  font-size: 13px;
}

.contact-list {
  margin: 0;
  display: grid;
  gap: 12px;
}

.contact-list > div {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 12px;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.contact-list dt {
  color: var(--muted);
  font-size: 14px;
}

.contact-list dd {
  margin: 0;
  color: var(--text);
}

.privacy-list {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.privacy-list li + li {
  margin-top: 10px;
}

.site-footer {
  padding: 36px 0 48px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.4);
}

.site-footer p {
  margin: 0 0 8px;
}

.site-footer p:last-child {
  margin-bottom: 0;
}

.footer-company {
  color: var(--text);
  font-size: 14px;
}

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

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

.footer-copy {
  margin-top: 4px;
  opacity: 0.9;
}

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-block;
  }

  .nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: #f7faf6;
    border-bottom: 1px solid var(--line);
    padding: 12px 20px 16px;
    flex-direction: column;
    gap: 12px;
  }

  .nav.open {
    display: flex;
  }

  .contact-list > div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .hero {
    padding-top: 48px;
  }
}