:root {
  --primary: #10B981;
  --primary-dark: #059669;
  --ink: #111111;
  --text: #374151;
  --muted: #6b7280;
  --line: #e5e7eb;
  --bg: #ffffff;
  --bg-alt: #f7f7f8;
  --radius: 6px;
  --nav-h: 64px;
  --font: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Helvetica, Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { color: var(--ink); font-weight: 600; letter-spacing: -0.02em; margin: 0 0 24px; }
h1 { font-size: clamp(36px, 5vw, 52px); line-height: 1.15; font-weight: 500; }
h2 { font-size: clamp(26px, 3vw, 34px); line-height: 1.25; }
h3 { font-size: 20px; line-height: 1.4; margin-bottom: 12px; }
p { margin: 0 0 16px; max-width: 68ch; }
.muted { color: var(--muted); }

.container { width: min(1120px, calc(100% - 48px)); margin: 0 auto; }
.container.narrow { width: min(720px, calc(100% - 48px)); }

.site-header {
  height: var(--nav-h);
  border-bottom: 1px solid var(--line);
  background: #fff;
}
.nav {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; color: var(--ink); font-size: 15px; }
.brand img { width: 36px; height: 36px; }
.nav-links { display: flex; gap: 22px; align-items: center; font-size: 14px; color: var(--text); }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--primary-dark); }
.nav-toggle { display: none; background: none; border: 0; padding: 8px; cursor: pointer; }
.nav-toggle span { display: block; width: 20px; height: 1.5px; background: var(--ink); margin: 5px 0; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 4px;
  border: 0;
  font-size: 15px;
  font-family: inherit;
  cursor: pointer;
  transition: background 200ms, color 200ms, opacity 200ms;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: transparent; color: var(--ink); text-decoration: underline; text-underline-offset: 4px; padding: 14px 8px; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

.hero { padding: 80px 0 40px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 64px; align-items: center; }
.hero .lead { font-size: 18px; color: var(--muted); margin-bottom: 32px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; align-items: center; }
.hero-visual { border-radius: 6px; overflow: hidden; }
.hero-visual img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }

.section { padding: 112px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { margin-bottom: 48px; }
.section-head p { color: var(--muted); }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px; }
.card { }
.card img { width: 100%; aspect-ratio: 4/3; object-fit: cover; border-radius: 6px; margin-bottom: 16px; }
.card p { font-size: 15px; color: var(--muted); }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.split img { width: 100%; border-radius: 6px; aspect-ratio: 4/3; object-fit: cover; }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; padding: 48px 0; }
.stat-n { font-size: 32px; font-weight: 600; color: var(--ink); letter-spacing: -0.03em; }
.stat-l { font-size: 14px; color: var(--muted); }

.list-plain { list-style: none; padding: 0; margin: 0; }
.list-plain li { padding: 18px 0; border-bottom: 1px solid var(--line); }
.list-plain li:last-child { border-bottom: 0; }

.page-hero { padding: 72px 0 24px; }
.page-hero h1 { margin-bottom: 16px; }

.form label { display: block; font-size: 14px; color: var(--ink); margin-bottom: 18px; }
.form input, .form textarea {
  display: block; width: 100%; margin-top: 8px;
  border: 1px solid var(--line); border-radius: 4px;
  padding: 12px 14px; font: inherit; color: var(--text); background: #fff;
}
.form input:focus, .form textarea:focus { outline: 2px solid var(--primary); outline-offset: 1px; }
.form-msg { font-size: 14px; color: var(--muted); min-height: 1.5em; }

.contact-meta { font-size: 16px; }
.contact-meta p { margin-bottom: 8px; max-width: none; }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 32px 0 80px;
  color: var(--muted);
  font-size: 14px;
}
.footer-row { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-row a { color: var(--muted); }
.footer-row a:hover { color: var(--primary-dark); }
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; }

.float-cta {
  position: fixed; right: 20px; bottom: 20px; z-index: 20;
  background: var(--primary); color: #fff;
  padding: 12px 18px; border-radius: 4px; font-size: 14px;
  box-shadow: none;
}
.float-cta:hover { background: var(--primary-dark); }

.news-card time { font-size: 13px; color: var(--muted); display: block; margin-bottom: 8px; }
.card-media img { aspect-ratio: 16/9; }

@media (max-width: 900px) {
  .hero-grid, .split, .grid-3, .grid-2, .stats { grid-template-columns: 1fr; }
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; left: 0; right: 0; top: 64px;
    background: #fff; border-bottom: 1px solid var(--line);
    flex-direction: column; padding: 16px 24px 24px; align-items: flex-start; z-index: 30;
  }
  .site-header.open .nav-links { display: flex; }
  .hero { padding: 40px 0; }
  .section { padding: 72px 0; }
  .stats { grid-template-columns: 1fr 1fr; }
}