/* 基础重置与变量 */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "Microsoft YaHei", sans-serif; color: #222; }
:root {
  --primary: #0b6efd;
  --primary-dark: #0a58ca;
  --bg: #f7f9fc;
  --text: #222;
  --muted: #666;
  --border: #e5e7eb;
  --max: 1200px;
}

/* 头部 */
.header {
  position: sticky; top: 0; z-index: 1000; background: #fff; border-bottom: 1px solid var(--border);
}
.nav {
  max-width: var(--max); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 0.75rem 1rem;
}
.nav .logo {
  display: flex; align-items: center; gap: 0.5rem; font-weight: 700; font-size: 1.25rem; color: var(--text); text-decoration: none;
}
.logo svg { width: 28px; height: 28px; fill: #072019; }
.nav ul { list-style: none; display: flex; gap: 1rem; margin: 0; padding: 0; }
.nav a { text-decoration: none; color: var(--text); padding: 0.5rem 0.75rem; border-radius: 6px; }
.nav a:hover, .nav a.active { color: #fff; background: var(--primary); }

/* 轮播 */
.carousel { position: relative; width: 100%; background: #000; }
.carousel .track { position: relative; overflow: hidden; height: 480px; }
.slide { position: absolute; inset: 0; opacity: 0; transition: opacity 600ms ease; }
.slide.active { opacity: 1; }
.slide img { width: 100%; height: 100%; object-fit: cover; filter: contrast(1.05) saturate(1.1); }
.carousel .dots { position: absolute; left: 50%; bottom: 14px; transform: translateX(-50%); display: flex; gap: 8px; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,0.6); cursor: pointer; border: 1px solid rgba(0,0,0,0.2); }
.dot.active { background: #072019; border-color: #072019; }

/* 通用段落与容器 */
.section { padding: 3rem 1rem; background: #fff; }
.section.alt { background: var(--bg); }
.container { max-width: var(--max); margin: 0 auto; }
.section h2 { margin: 0 0 1rem; font-size: 1.8rem; }
.section p { color: var(--muted); line-height: 1.75; }
.actions { margin-top: 1.25rem; }
.btn { display: inline-block; text-decoration: none; padding: 0.6rem 1rem; border-radius: 8px; font-weight: 600; }
.btn.primary { background: #072019; color: #fff; }
.btn.primary:hover { background: #072019; }
.btn.ghost { border: 1px solid var(--border); color: var(--text); }
.btn.ghost:hover { border-color: #072019; color: #072019; }

/* 产品列表 */
.products { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.product-card { background: #fff; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,0.04); }
.product-card img { width: 100%; height: 160px; object-fit: cover; }
.product-card .info { padding: 0.75rem 0.75rem 1rem; }
.product-card .title { font-weight: 600; }
.product-card .meta { color: var(--muted); font-size: 0.9rem; }

/* 合作伙伴logo */
.partners { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1rem; align-items: center; }
.partner { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 0.75rem; display: flex; align-items: center; justify-content: center; }
.partner img { max-width: 100%; height: 44px; object-fit: contain; filter: grayscale(40%); }

/* 页脚墨绿色主题与白色文字 */
.footer { background: #072019; color: #fff; }
.footer .brand svg { width: 28px; height: 28px; fill: #fff; }
.footer .vnav a { color: #fff; }
.footer .vnav a:hover { color: #cdeae3; }
.footer .contact { color: #fff; }
.footer .contact a { color: #fff; text-decoration: none; }
.footer .contact a:hover { color: #cdeae3; }
.footer a { color: #fff !important; }
.footer .bottom { border-top: 1px solid rgba(255,255,255,0.2); color: rgba(255,255,255,0.8); }
.footer .wrap { max-width: var(--max); margin: 0 auto; display: grid; grid-template-columns: 1.2fr 1fr 1.6fr; gap: 1rem; padding: 2rem 1rem; }
.footer .brand { display: flex; align-items: center; gap: 0.75rem; }
.footer .brand .logo-text { font-size: 1.1rem; font-weight: 700; }
.footer .vnav { display: flex; flex-direction: column; gap: 0.4rem; }
.footer .vnav a { color: #d1d5db; text-decoration: none; }
.footer .vnav a:hover { color: #fff; }
.footer .contact { font-size: 0.95rem; }
.footer .bottom { border-top: 1px solid #1f2937; padding: 0.75rem 1rem; text-align: center; font-size: 0.85rem; color: #94a3b8; }

/* 响应式 */
@media (max-width: 1024px) {
  .products { grid-template-columns: repeat(3, 1fr); }
  .partners { grid-template-columns: repeat(3, 1fr); }
  .carousel .track { height: 420px; }
}
@media (max-width: 768px) {
  .nav ul { gap: 0.25rem; }
  .nav a { padding: 0.4rem 0.5rem; }
  .products { grid-template-columns: repeat(2, 1fr); }
  .footer .wrap { grid-template-columns: 1fr; }
  .carousel .track { height: 300px; }
}
@media (max-width: 480px) {
  .products { grid-template-columns: 1fr; }
  .partners { grid-template-columns: repeat(2, 1fr); }
  .carousel .track { height: 220px; }
}

/* 细节优化与商业风格增强 */
.header { box-shadow: 0 6px 20px rgba(0,0,0,0.06); }
.nav .logo { letter-spacing: 0.5px; }
.product-card { transition: transform 160ms ease, box-shadow 160ms ease; }
.product-card:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.08); }
.partner img { filter: grayscale(60%) contrast(1.05); opacity: 0.9; }

/* 汉堡菜单 */
.hamburger { display: none; width: 36px; height: 36px; border: 1px solid var(--border); border-radius: 8px; background: #fff; align-items: center; justify-content: center; gap: 4px; cursor: pointer; }
.hamburger span { display: block; width: 18px; height: 2px; background: var(--text); }
.nav.open .hamburger { border-color: #072019; }

/* 移动端导航行为 */
@media (max-width: 768px) {
  .nav { position: relative; }
  .nav .hamburger { display: inline-flex; }
  .nav .menu { position: absolute; top: 56px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--border); box-shadow: 0 12px 24px rgba(0,0,0,0.06); display: none; flex-direction: column; padding: 0.5rem 0.75rem; }
  .nav.open .menu { display: flex; }
  .nav .menu a { padding: 0.6rem 0.5rem; }
}
/* 顶部导航下划线样式（替换原背景高亮） */
.nav a { position: relative; }
.nav a:hover, .nav a.active { background: transparent; color: #072019; }
.nav a::after { content: ""; position: absolute; left: 0.5rem; right: 0.5rem; bottom: 0.2rem; height: 2px; background: #072019; transform: scaleX(0); transform-origin: center; transition: transform 200ms ease; border-radius: 1px; }
.nav a:hover::after, .nav a.active::after { transform: scaleX(1); }

/* 页脚悬停细微反馈 */
.footer .vnav a, .footer .contact a { text-decoration: none; transition: filter 160ms ease, color 160ms ease, text-decoration-color 160ms ease; }
.footer .vnav a:hover, .footer .contact a:hover { text-decoration: underline; text-underline-offset: 0.15em; text-decoration-thickness: 1px; filter: brightness(1.1); }