:root {
  --bg: #f4f7f2;
  --bg-elevated: #ffffff;
  --ink: #14201a;
  --ink-muted: #4a5a52;
  --accent: #1f6b4a;
  --accent-soft: #d8ebe1;
  --line: #d5e0d8;
  --radius: 14px;
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", sans-serif;
  --max: 1080px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, #e4f0e8 0%, transparent 55%),
    radial-gradient(900px 420px at 100% 0%, #eef3ea 0%, transparent 50%),
    var(--bg);
  line-height: 1.7;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(244, 247, 242, 0.92);
  border-bottom: 1px solid var(--line);
}

.site-header__inner,
.section__inner,
.site-footer__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
}

.brand {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.04em;
}

.nav {
  display: flex;
  gap: 22px;
  align-items: center;
}

.nav a {
  color: var(--ink-muted);
  font-size: 0.95rem;
}

.nav a.is-active,
.nav a:hover {
  color: var(--accent);
  text-decoration: none;
}

.nav a:focus-visible {
  color: var(--accent);
  text-decoration: none;
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1.25;
  margin: 0 0 16px;
  max-width: 14em;
}

.hero p {
  max-width: 36em;
  color: var(--ink-muted);
  font-size: 1.05rem;
  margin: 0;
}

.section {
  padding: 48px 0;
}

.section--card {
  background: var(--bg-elevated);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section h2 {
  font-family: var(--font-display);
  font-size: 1.55rem;
  margin: 0 0 20px;
}

.lead {
  color: var(--ink-muted);
  max-width: 42em;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.feature-card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.feature-card p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.95rem;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.contact-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.contact-list span {
  display: inline-block;
  min-width: 4.5em;
  color: var(--ink-muted);
}

.legal-page {
  padding: 40px 0 72px;
}

.legal-page h1 {
  font-family: var(--font-display);
  font-size: 1.8rem;
  margin: 0 0 12px;
}

.legal-page .meta {
  color: var(--ink-muted);
  font-size: 0.9rem;
  margin-bottom: 28px;
}

.legal-page h2 {
  font-size: 1.15rem;
  margin: 28px 0 10px;
}

.legal-page p,
.legal-page li {
  color: var(--ink-muted);
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 36px;
  color: var(--ink-muted);
  font-size: 0.9rem;
}

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

@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; }
  .nav {
    display: none;
    position: absolute;
    right: 24px;
    top: 100%;
    margin-top: 8px;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding: 16px 18px;
    background: var(--bg-elevated);
    border: 1px solid var(--line);
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(20, 32, 26, 0.08);
  }
  .nav.is-open { display: flex; }
  .feature-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 48px; }
}