/* 基础样式重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: #12141A;
  line-height: 1.5;
}

/* 颜色变量 */
:root {
  --page-text: #12141A;
  --page-muted: #8B95A9;
  --page-line: #E4EBF6;
  --primary-color: #2a67ff;
  --gradient-start: #35bbff;
  --gradient-end: #9f90ff;
}

/* 布局容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

/* 头部样式 */
.header-sticky {
  position: sticky;
  top: 0;
  z-index: 40;
  background: transparent;
  backdrop-filter: none;
  box-shadow: none;
  border-bottom: 1px solid rgba(15, 23, 42, 0.1);
  transition: backdrop-filter 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease;
}

.header-sticky.is-scrolled {
  background: rgba(248, 251, 255, 0.08);
  backdrop-filter: blur(16px);
  box-shadow: 0 8px 24px rgba(125, 143, 180, 0.10);
}

.header-content {
  display: flex;
  height: 44px;
  width: calc(100% - 48px);
  align-items: center;
  justify-content: space-between;
  margin: 0 auto;
  padding: 0 16px;
}

@media (min-width: 768px) {
  .header-content {
    height: 48px;
  }
}

.header-left {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: #262626;
}

@media (min-width: 768px) {
  .header-left {
    font-size: 13px;
  }
}

.header-right {
  display: flex;
  gap: 16px;
  align-items: center;
  font-size: 14px;
}

.header-right .tag:not(:last-child):after {
  position: relative;
  content: "|";
  left: 0.5rem;
}

.logo-link {
  margin-right: 16px;
}

.logo-img {
  height: 30px;
}

/* 导航链接 */
.top-nav-link {
  position: relative;
  transition: color 0.2s ease;
}

.top-nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -8px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, #35bbff 0%, #9f90ff 100%);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.22s ease;
}

.top-nav-link:hover {
  color: var(--primary-color);
}

.top-nav-link:hover::after {
  transform: scaleX(1);
}

/* 下载按钮 */
.download {
  font-size: 16px;
  font-weight: 700;
  color: white;
}
.header-button {
  height: 32px;
  box-shadow: 0 0 #0000, 0 0 #0000, 0 8px 18px rgba(17,17,17,0.14);
  font-weight: 600;
  font-size: 11px;
  padding-left: 1rem;
  padding-right: 1rem;
  background-color: rgb(17 17 17 / 1);
  border-radius: 5px;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  text-decoration: inherit;
}


@media (min-width: 768px) {
  .header-button {
    min-width: 98px;
  }
  .download-pill {
    font-size: 18px;
  }
}

.download-pill {
  position: relative;
  width: 230px;
  height: 75px;
  display: flex;
  justify-content: center;
  background: url('https://appstore-assets.oss-cn-hangzhou.aliyuncs.com/t1/assets/btbg.png') center center / 100% 100% no-repeat;
  transition: transform 0.25s ease, filter 0.25s ease, box-shadow 0.25s ease;
  filter: drop-shadow(0 16px 24px rgba(94, 146, 255, 0.24));
  padding-top: 10px;
  text-decoration: none;
  color: white;
  font-weight: bold;
  margin-top: 1.5rem;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.download-pill img {
  height: 20px;
  margin-top: 5px;
  margin-right: 5px;
}

.download-pill:hover {
  transform: translateY(-2px) scale(1.02);
  filter: drop-shadow(0 22px 30px rgba(94, 146, 255, 0.32));
}

/* 主内容区域 */
main {
  position: relative;
}

.hero-section {
  position: relative;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 20;
  max-width: 1200px;
  margin: 0 auto;
  padding: 74px 8px 150px;
  text-align: center;
}

@media (min-width: 768px) {
  .hero-content {
    padding: 86px 8px 168px;
  }
}

.hero-title {
  margin-top: 8px;
  font-size: 42px;
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: 0.01em;
  color: #111318;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 62px;
  }
}

.hero-subtitle {
  margin-top: 12px;
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--page-muted);
}

@media (min-width: 768px) {
  .hero-subtitle {
    font-size: 18px;
  }
}

.hero-download {
  margin: 24px auto 0;
}

.download-count {
  margin-top: 12px;
  font-size: 13px;
  font-weight: 600;
  color: #8792aa;
}

.system-info {
  margin-top: 8px;
  font-size: 11px;
  color: #aab4c5;
}

/* 特性卡片 */
.features-section {
  position: relative;
  z-index: 20;
  max-width: 1200px;
  margin: -120px auto 0;
  padding: 0 16px;
}

.features-container {
  display: flex;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
}

.feature-card {
  width: 250px;
  border-radius: 10px;
  border: 1px solid var(--page-line);
  background: rgba(255, 255, 255, 0.95);
  padding: 32px 28px 28px;
  text-align: center;
  box-shadow: 0 16px 36px rgba(113, 130, 168, 0.12);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.feature-card:hover {
  transform: translateY(-8px);
}

.feature-icon-wrapper {
  margin: 0 auto;
  width: 76px;
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  padding: 24px;
}

.feature-icon-blue {
  background: linear-gradient(to right, rgba(79, 172, 254, 0.15), rgba(0, 242, 254, 0.15));
}

.feature-icon-orange {
  background: linear-gradient(114deg, rgba(250, 204, 34, 0.15), rgba(248, 54, 0, 0.15));
}

.feature-icon-purple {
  background: linear-gradient(116deg, rgba(153, 41, 234, 0.15), rgba(88, 8, 251, 0.15));
}

.feature-icon {
  width: 60px;
  height: 60px;
  object-fit: contain;
}

.feature-title {
  margin-top: 20px;
  font-size: 20px;
  font-weight: 700;
}

.feature-desc {
  margin-top: 12px;
  font-size: 14px;
  line-height: 2;
  color: var(--page-muted);
}

/* 资质证书部分 */
.certificates-section {
  margin-top: 48px;
  padding: 32px 0 64px;
  background: #F2F4F7;
}

.section-title {
  text-align: center;
  font-size: 28px;
  font-weight: 900;
  line-height: 1.2;
}

@media (min-width: 768px) {
  .section-title {
    font-size: 34px;
  }
}

.section-desc {
  max-width: 760px;
  margin: 12px auto 0;
  text-align: center;
  font-size: 15px;
  line-height: 1.75;
  color: var(--page-muted);
}

.certificates-grid {
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 12px;
}

@media (min-width: 640px) {
  .certificates-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .certificates-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1280px) {
  .certificates-grid {
    grid-template-columns: repeat(7, 1fr);
  }
}

.certificate-item {
  display: flex;
  min-height: 90px;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
  border: 1px solid var(--page-line);
  background: rgba(255, 255, 255, 0.95);
  padding: 16px;
  box-shadow: 0 10px 22px rgba(117, 133, 166, 0.08);
}

.certificate-img {
  max-width: 100%;
  height: auto;
}

/* 用户评价部分 */
.testimonials-section {
  padding: 64px 0;
}

.testimonials-grid {
  margin-top: 40px;
  display: grid;
  gap: 20px;
}

@media (min-width: 768px) {
  .testimonials-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.testimonial-card {
  border-radius: 20px;
  border: 1px solid var(--page-line);
  background: white;
  padding: 24px;
  box-shadow: 0 16px 36px rgba(113, 130, 168, 0.12);
}

.testimonial-header {
  display: flex;
  align-items: center;
  gap: 14px;
}

.testimonial-avatar {
  width: 54px;
  height: 54px;
  border-radius: 50%;
}

.testimonial-author {
  display: block;
  font-size: 16px;
  font-weight: 700;
}

.testimonial-scene {
  font-size: 12px;
  color: #97A1B3;
}

.testimonial-content {
  margin-top: 16px;
  font-size: 14px;
  line-height: 2;
  color: var(--page-muted);
}

/* 数据统计部分 */
.stats-section {
  background: 
    url('https://appstore-assets.oss-cn-hangzhou.aliyuncs.com/t1/assets/databg.png') center top / cover no-repeat,
    linear-gradient(180deg, #eff6ff 0%, #f8fbff 100%);
  padding: 64px 0;
  overflow: hidden;
}

@media (min-width: 768px) {
  .stats-section {
    padding: 80px 0;
  }
}

.stats-grid {
  display: grid;
  gap: 32px;
}

@media (min-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.stat-item {
  text-align: center;
}

.data-icon {
  width: 29px;
  height: 29px;
  margin: 0 auto 16px;
}

.stat-number {
  display: block;
  font-size: 34px;
  font-weight: 900;
  line-height: 1;
}

@media (min-width: 768px) {
  .stat-number {
    font-size: 38px;
  }
}

.stat-label {
  display: block;
  margin-top: 12px;
  font-size: 15px;
  font-weight: 600;
  color: #4F5F7F;
}

.stats-cta {
  margin-top: 56px;
  text-align: center;
}

.stats-cta-title {
  font-size: 28px;
  font-weight: 900;
  line-height: 1.2;
}

@media (min-width: 768px) {
  .stats-cta-title {
    font-size: 34px;
  }
}

.stats-cta-desc {
  margin-top: 12px;
  font-size: 14px;
  color: var(--page-muted);
}

.stats-download {
  margin: 20px auto 0;
}

/* 页脚 */
footer {
  padding: 32px 16px;
  text-align: center;
  font-size: 12px;
  line-height: 1.75;
  color: #B0B7C5;
}

@media (min-width: 768px) {
  footer {
    padding: 40px 16px;
  }
}

/* 背景横幅 */
.banner-bg {
  position: absolute;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  overflow: hidden;
  pointer-events: none;
  max-height: 550px;
}

.banner-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}