*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #222;
  background-color: #f7f7f7;
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 16px;
}

.site-header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
  z-index: 100;
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.08em;
}

.nav a {
  margin-left: 18px;
  text-decoration: none;
  color: #333;
  font-size: 14px;
}

.nav a.active,
.nav a:hover {
  color: #0070c9;
}

.hero {
  position: relative;
  min-height: 72vh;
  background-image: linear-gradient(
      rgba(0, 0, 0, 0.45),
      rgba(0, 0, 0, 0.35)
    ),
    url("assets/hero.jpg");
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  margin-top: 64px;
}

.hero-content {
  position: relative;
  color: #fff;
  max-width: 680px;
  padding: 40px 0;
}

.hero h1 {
  font-size: 32px;
  margin-bottom: 16px;
}

.hero-cn {
  display: block;
  font-size: 22px;
  margin-top: 6px;
}

.hero p {
  font-size: 15px;
  margin-bottom: 24px;
}

.hero-buttons .btn {
  margin-right: 12px;
}

.section {
  padding: 72px 0;
  background-color: #f7f7f7;
}

.section-alt {
  padding: 72px 0;
  background-color: #ffffff;
}

.section-title {
  font-size: 24px;
  text-align: center;
  margin-bottom: 24px;
}

.section-intro {
  text-align: center;
  margin-bottom: 32px;
  color: #555;
}

.section-note {
  text-align: center;
  margin-top: 16px;
  font-size: 13px;
  color: #777;
}

.grid {
  display: grid;
  gap: 20px;
}

.grid.two {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid.three {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.grid.four {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.card h3 {
  margin-bottom: 10px;
  font-size: 16px;
}

.card p {
  font-size: 14px;
  color: #555;
}

.product-card {
  padding: 0;
  overflow: hidden;
}

.product-card a {
  color: inherit;
  text-decoration: none;
  display: block;
}

.product-image {
  height: 180px;
  background-size: cover;
  background-position: center;
}

.product-body {
  padding: 16px 16px 16px;
}

.list {
  padding-left: 18px;
  font-size: 14px;
  color: #555;
}

.list li {
  margin-bottom: 6px;
}

.contact-box {
  max-width: 420px;
  margin: 0 auto;
  text-align: center;
  background: #fff;
  padding: 24px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.site-footer {
  padding: 24px 0;
  background: #111;
  color: #aaa;
  font-size: 13px;
  text-align: center;
}

.page {
  margin-top: 64px;
}

.form {
  max-width: 760px;
  margin: 0 auto;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px 24px;
  margin-bottom: 12px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.form-group-full {
  grid-column: 1 / -1;
}

.form label {
  font-size: 13px;
  color: #444;
}

.form input,
.form textarea {
  border-radius: 8px;
  border: 1px solid #ccc;
  padding: 8px 10px;
  font-size: 14px;
}

.form textarea {
  resize: vertical;
}

.form-note {
  font-size: 12px;
  color: #777;
  margin: 8px 0 16px;
}

.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 14px;
  text-decoration: none;
  border: 1px solid transparent;
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn-primary {
  background-color: #0070c9;
  color: #fff;
  border-color: #0070c9;
}

.btn-primary:hover {
  background-color: #005a9a;
  border-color: #005a9a;
}

.btn-outline {
  background-color: transparent;
  color: #fff;
  border-color: #fff;
}

.btn-outline:hover {
  background-color: rgba(255, 255, 255, 0.18);
}

.stone-xin-yudubai {
  background-image: url("assets/xin-yudubai.jpg");
}
.stone-jueshi-bai {
  background-image: url("assets/jueshi-bai.jpg");
}
.stone-bai-meigui {
  background-image: url("assets/bai-meigui.jpg");
}
.stone-xin-shaanna {
  background-image: url("assets/xin-shaanna.jpg");
}
.stone-aimashi-hui {
  background-image: url("assets/aimashi-hui.jpg");
}
.stone-huanying-hui {
  background-image: url("assets/huanying-hui.jpg");
}
.stone-kadiya-hui {
  background-image: url("assets/kadiya-hui.jpg");
}
.stone-huibai-muwen {
  background-image: url("assets/huibai-muwen.jpg");
}
.stone-huidong-shi {
  background-image: url("assets/huidong-shi.jpg");
}
.stone-yidali-hui {
  background-image: url("assets/yidali-hui.jpg");
}
.stone-xiangyun-hui {
  background-image: url("assets/xiangyun-hui.jpg");
}
.stone-yueguang-hui {
  background-image: url("assets/yueguang-hui.jpg");
}
.stone-faguo-muwen {
  background-image: url("assets/faguo-muwen.jpg");
}
.stone-mihuang-dongshi {
  background-image: url("assets/mihuang-dongshi.jpg");
}
.stone-yueguang-mihuang {
  background-image: url("assets/yueguang-mihuang.jpg");
}
.stone-yunduo-mihuang {
  background-image: url("assets/yunduo-mihuang.jpg");
}
.stone-maoyanlv-qian {
  background-image: url("assets/maoyanlv-qian.jpg");
}
.stone-pulada-lv {
  background-image: url("assets/pulada-lv.jpg");
}
.stone-chundai-cai {
  background-image: url("assets/chundai-cai.jpg");
}
@media (max-width: 768px) {
  .nav {
    display: none;
  }
  .hero h1 {
    font-size: 26px;
  }
  .hero-cn {
    font-size: 18px;
  }
  .hero p {
    font-size: 13px;
  }
}