* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Microsoft YaHei", sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  background: #f9fafb;
  color: #333;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 导航 */
.header {
  background: #fff;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 999;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 0;
}

.logo {
  font-size: 22px;
  font-weight: bold;
  color: #111;
}

.nav a {
  margin-left: 24px;
  text-decoration: none;
  color: #555;
  font-size: 15px;
  transition: 0.3s;
}

.nav a:hover {
  color: #1677ff;
}

/* 首屏 */
.hero {
  padding: 70px 0;
}

.hero-flex {
  display: flex;
  align-items: center;
  gap: 40px;
}

.hero-text h1 {
  font-size: 38px;
  margin-bottom: 12px;
  color: #111;
}

.slogan {
  font-size: 18px;
  color: #1677ff;
  font-weight: bold;
  margin-bottom: 14px;
}

.intro {
  font-size: 16px;
  color: #666;
  line-height: 1.7;
  margin-bottom: 26px;
}

.hero-buttons {
  display: flex;
  gap: 14px;
}

.btn {
  padding: 14px 28px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: bold;
  transition: 0.3s;
}

.btn.primary {
  background: #1677ff;
  color: #fff;
}

.btn.primary:hover {
  background: #0d5cbd;
}

.btn.second {
  background: #fff;
  color: #333;
  border: 1px solid #ddd;
}

.btn.second:hover {
  background: #f5f5f5;
}

.hero-img img {
  max-width: 360px;
  border-radius: 12px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.08);
}

/* 核心亮点 */
.highlights {
  padding: 50px 0;
  background: #fff;
}

.grid3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  text-align: center;
}

.card {
  padding: 30px 20px;
  background: #f9fafb;
  border-radius: 10px;
}

.card h3 {
  margin-bottom: 8px;
  font-size: 17px;
}

.card p {
  color: #666;
  font-size: 14px;
}

/* 功能介绍 */
.features {
  padding: 70px 0;
}

.title {
  text-align: center;
  font-size: 26px;
  margin-bottom: 40px;
  color: #222;
}

.grid4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.item {
  background: #fff;
  padding: 28px 20px;
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.item h4 {
  margin-bottom: 10px;
  font-size: 16px;
}

.item p {
  color: #666;
  font-size: 14px;
  line-height: 1.6;
}

/* 截图 */
.screenshots {
  padding: 60px 0;
  background: #fff;
}

.shot-grid {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.shot-grid img {
  width: 290px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}

/* 价格 */
.price-section {
  padding: 70px 0;
  text-align: center;
}

.price-card {
  max-width: 360px;
  margin: 0 auto;
  background: #fff;
  padding: 40px 30px;
  border-radius: 12px;
  box-shadow: 0 4px 18px rgba(0,0,0,0.06);
}

.price-card h3 {
  font-size: 20px;
  margin-bottom: 14px;
}

.price {
  font-size: 36px;
  color: #ff4d4f;
  font-weight: bold;
  margin-bottom: 24px;
}

.price-card ul {
  list-style: none;
  margin-bottom: 30px;
}

.price-card li {
  padding: 8px 0;
  color: #444;
}

.btn.buy {
  background: #1677ff;
  color: #fff;
  display: inline-block;
  padding: 14px 40px;
  border-radius: 6px;
}

.btn.buy:hover {
  background: #0d5cbd;
}

/* 售后 */
.service {
  padding: 60px 0;
  background: #fff;
}

.ser-item {
  padding: 26px;
  background: #f9fafb;
  border-radius: 10px;
  text-align: center;
}

.ser-item h4 {
  margin-bottom: 10px;
}

.ser-item p {
  color: #666;
  font-size: 14px;
}

/* FAQ */
.faq {
  padding: 70px 0;
}

.faq-list {
  max-width: 750px;
  margin: 0 auto;
}

.q {
  font-weight: bold;
  background: #fff;
  padding: 16px 20px;
  border-radius: 8px;
  margin-bottom: 8px;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0,0,0,0.03);
}

.a {
  padding: 0 20px 14px 20px;
  color: #555;
  display: none;
}

.faq-list .q.active + .a {
  display: block;
}

/* 底部 */
.footer {
  background: #fff;
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid #eee;
}

.foot-content p {
  color: #777;
  font-size: 14px;
  margin: 6px 0;
}

/* 手机适配 */
@media (max-width: 768px) {
  .hero-flex {
    flex-direction: column;
    text-align: center;
  }

  .hero-text h1 {
    font-size: 28px;
  }

  .hero-buttons {
    justify-content: center;
  }

  .grid3, .grid4 {
    grid-template-columns: 1fr;
  }

  .navbar {
    flex-direction: column;
    gap: 12px;
  }

  .nav a {
    margin: 0 10px;
  }

  .shot-grid img {
    width: 100%;
  }
}