:root {
  --primary: #3db049;
  --primary-hover: #349c40;
  --primary-light: #eaf8ec;
  --bg-color: #f8faf8;
  --text-main: #142419;
  --text-muted: #5c6b60;
  --border-color: #dce5dc;
  --card-bg: #ffffff;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 顶部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 250, 248, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  height: 70px;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-img {
  height: 38px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  font-weight: 600;
}

.header-action .btn-download {
  display: inline-block;
  background: var(--primary);
  color: #ffffff;
  padding: 8px 22px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s;
}

.header-action .btn-download:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-main);
}

/* 移动端菜单 */
.mobile-nav {
  display: none;
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
  padding: 16px 20px;
}

.mobile-nav.open {
  display: block;
}

.mobile-nav a {
  display: block;
  padding: 12px 0;
  font-size: 16px;
  border-bottom: 1px solid #f0f0f0;
  color: var(--text-main);
}

.mobile-nav a.active {
  color: var(--primary);
  font-weight: 600;
}

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
  background: #ffffff;
  margin-top: 60px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
  }
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 14px;
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-copy {
  font-size: 13px;
  color: var(--text-muted);
}

/* 首页 Hero */
.hero-section {
  padding: 60px 0 40px;
  text-align: center;
}

.hero-title {
  font-size: 48px;
  font-weight: 900;
  color: var(--primary);
  line-height: 1.2;
  margin-bottom: 12px;
}

.hero-subtitle {
  font-size: 38px;
  font-weight: 300;
  color: var(--text-main);
  margin-bottom: 24px;
}

.hero-tags {
  font-size: 20px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 36px;
}

.hero-download-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  margin-bottom: 40px;
}

.btn-hero-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 70px;
  width: 220px;
  background: var(--primary);
  color: #ffffff;
  font-size: 22px;
  font-weight: bold;
  border-radius: 20px;
  box-shadow: 0 10px 25px rgba(61, 176, 73, 0.3);
  transition: all 0.25s;
}

.btn-hero-download:hover {
  background: var(--primary-hover);
  transform: scale(1.04);
}

.version-info {
  font-size: 14px;
  color: #142419;
}

.version-info span {
  margin: 0 10px;
}

/* 核心指标 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 700px;
  margin: 0 auto 50px;
  text-align: center;
}

.stat-item .stat-value {
  font-size: 42px;
  font-weight: 900;
  color: var(--text-main);
}

.stat-item .stat-label {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* 截图主视觉 */
.hero-image-wrap {
  max-width: 960px;
  margin: 0 auto;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
  border: 1px solid var(--border-color);
}

.hero-image-wrap img {
  width: 100%;
  display: block;
}

/* 特色功能 */
.features-section {
  padding-top: 30px;
  padding-bottom: 80px;
}

.section-tag {
  font-size: 24px;
  font-weight: bold;
  color: var(--primary);
  letter-spacing: 2px;
}

.section-heading {
  font-size: 36px;
  font-weight: bold;
  margin-top: 10px;
  margin-bottom: 40px;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 768px) {
  .features-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.feature-card {
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 36px;
  transition: all 0.25s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(0,0,0,0.06);
}

.feature-num {
  position: absolute;
  top: 24px;
  right: 28px;
  font-size: 36px;
  font-weight: 900;
  color: #e5ece5;
}

.feature-icon-box {
  width: 50px;
  height: 50px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.feature-title {
  font-size: 22px;
  font-weight: bold;
  margin-top: 24px;
}

.feature-desc {
  font-size: 15px;
  color: var(--text-muted);
  margin-top: 12px;
  line-height: 1.6;
}

/* 行动号召横幅 */
.cta-banner {
  background: var(--primary);
  color: #ffffff;
  border-radius: 28px;
  padding: 60px 30px;
  text-align: center;
  margin-bottom: 80px;
  position: relative;
  overflow: hidden;
}

.cta-title {
  font-size: 36px;
  font-weight: bold;
  margin-bottom: 16px;
}

.cta-desc {
  font-size: 18px;
  opacity: 0.9;
  margin-bottom: 30px;
}

.btn-cta-download {
  display: inline-block;
  background: #ffffff;
  color: var(--primary);
  font-size: 18px;
  font-weight: bold;
  padding: 14px 42px;
  border-radius: 30px;
  transition: all 0.2s;
}

.btn-cta-download:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

/* 子页面通用布局 */
.page-header {
  padding: 60px 0 40px;
  text-align: center;
}

.page-tag {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 2px;
}

.page-title {
  font-size: 38px;
  font-weight: bold;
  margin-top: 12px;
}

.page-subtitle {
  font-size: 16px;
  color: var(--text-muted);
  margin-top: 12px;
}

/* 更新日志列表 */
.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  border-left: 2px solid var(--border-color);
  padding-left: 30px;
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
}

.timeline-dot {
  position: absolute;
  left: -37px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid #ffffff;
  box-shadow: 0 0 0 2px var(--primary);
}

.timeline-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 24px;
}

.version-badge {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: bold;
}

.release-date {
  font-size: 13px;
  color: var(--text-muted);
  margin-left: 10px;
}

.timeline-content {
  margin-top: 14px;
}

.timeline-content li {
  margin-bottom: 8px;
  font-size: 15px;
  color: #333333;
  list-style-position: inside;
}

/* FAQ 常见问题 */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 24px;
  font-size: 17px;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.faq-answer {
  display: none;
  padding: 0 24px 20px;
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  display: block;
}

.faq-item.active .faq-question {
  color: var(--primary);
}

/* 资讯列表 */
.news-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.news-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 28px;
  transition: all 0.2s;
  display: block;
}

.news-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(0,0,0,0.05);
  border-color: var(--primary);
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.news-tag {
  background: var(--primary-light);
  color: var(--primary);
  font-size: 12px;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 6px;
}

.news-date {
  font-size: 13px;
  color: var(--text-muted);
}

.news-title {
  font-size: 20px;
  font-weight: bold;
  color: var(--text-main);
  margin-bottom: 8px;
}

.news-desc {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 联系我们 */
.contact-grid {
  max-width: 860px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.contact-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 18px;
  padding: 32px;
  text-align: center;
}

.contact-icon {
  font-size: 36px;
  margin-bottom: 16px;
}

.contact-card h3 {
  font-size: 20px;
  margin-bottom: 8px;
}

.contact-card p {
  color: var(--text-muted);
  font-size: 15px;
}

/* 响应式适配 */
@media (max-width: 767px) {
  .nav-links, .header-action {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
  .hero-title {
    font-size: 32px;
  }
  .hero-subtitle {
    font-size: 24px;
  }
  .hero-tags {
    font-size: 15px;
  }
  .stats-grid {
    gap: 10px;
  }
  .stat-item .stat-value {
    font-size: 28px;
  }
  .btn-hero-download {
    width: 100%;
    max-width: 260px;
    height: 60px;
    font-size: 18px;
  }
}