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

html {
  scroll-behavior: smooth;
}

body {
  background: #f8fafc;
  font-family:
    "Segoe UI",
    system-ui,
    -apple-system,
    "PingFang SC",
    "Microsoft YaHei",
    sans-serif;
  min-height: 100vh;
  color: #334155;
  line-height: 1.6;
  overflow-x: hidden;
  background:
    radial-gradient(
      circle at 20% 25%,
      rgba(226, 232, 240, 0.35) 0%,
      transparent 45%
    ),
    linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* 导航栏 - 修改为 fixed 固定定位并铺满宽度 */
nav {
  width: 100%;
  position: fixed; /* 固定在页面顶部 */
  top: 0;
  left: 0;
  background: rgba(248, 250, 252, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
}

nav.sticky {
  border-bottom: 1px solid rgba(203, 213, 225, 0.3);
  box-shadow: 0 4px 20px -10px rgba(0, 0, 0, 0.1); /* 增加一点悬浮阴影 */
}

/* 导航栏内部容器，限制宽度并居中 */
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.2rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* 占位符，防止 fixed 导航栏遮挡内容 */
.nav-placeholder {
  height: 72px; /* 与导航栏高度保持一致 */
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.3rem;
  font-weight: 700;
  color: #0f172a;
  text-decoration: none;
}

.logo-icon {
  font-size: 1.8rem;
  background: #fef3c7;
  border-radius: 0.8rem;
  padding: 0.2rem;
  transition: transform 0.3s ease;
}

.logo:hover .logo-icon {
  transform: rotate(-10deg) scale(1.1);
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: #475569;
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  transition: color 0.2s;
}

.nav-links a:not(.nav-cta)::after {
  content: "";
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 0;
  background: #0f172a;
  transition: width 0.3s ease;
}

.nav-links a:not(.nav-cta):hover::after {
  width: 100%;
}

.nav-links a:hover {
  color: #0f172a;
}

.nav-cta {
  background: #0f172a;
  color: white !important;
  padding: 0.6rem 1.4rem;
  border-radius: 2rem;
  box-shadow: 0 10px 18px -8px rgba(15, 23, 42, 0.3);
  transition: all 0.2s;
}

.nav-cta:hover {
  background: #1e293b;
  transform: translateY(-2px);
  box-shadow: 0 14px 22px -8px rgba(15, 23, 42, 0.4);
}

/* 首屏 Hero 区域 */
.hero {
  text-align: center;
  padding: 4rem 0 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.hero-badges {
  display: flex;
  gap: 0.8rem;
  justify-content: center;
  margin-bottom: 0.5rem;
}

.badge {
  background: #f1f5f9;
  color: #334155;
  padding: 0.4rem 1.2rem;
  border-radius: 2rem;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid rgba(203, 213, 225, 0.5);
  animation: fadeInDown 0.8s ease-out;
}

.ai-badge {
  background: #ede9fe;
  color: #6b21a8;
  font-weight: 600;
}
.privacy-badge {
  background: #dcfce7;
  color: #166534;
  font-weight: 600;
}
.client-badge {
  background: #fef3c7;
  color: #d97706;
  font-weight: 600;
}

h1 {
  font-size: 3.5rem;
  font-weight: 700;
  color: #0f172a;
  letter-spacing: -1px;
  line-height: 1.2;
  max-width: 800px;
  background: linear-gradient(135deg, #1e293b, #0f172a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: #64748b;
  max-width: 600px;
  animation: fadeInUp 1s ease-out;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  animation: fadeInUp 1.2s ease-out;
}

.btn {
  border: none;
  padding: 0.9rem 2rem;
  border-radius: 2.5rem;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.btn-primary {
  background: #0f172a;
  color: white;
  box-shadow: 0 12px 24px -8px rgba(15, 23, 42, 0.35);
}

.btn-primary:hover {
  background: #1e293b;
  transform: translateY(-3px);
  box-shadow: 0 16px 30px -8px rgba(15, 23, 42, 0.45);
  color: white;
}

.btn-outline {
  background: white;
  border: 1px solid #cbd5e1;
  color: #1e293b;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
}

.btn-outline:hover {
  background: #f8fafc;
  border-color: #94a3b8;
  transform: translateY(-3px);
}

/* 3D 轮播图区域 */
.carousel-wrapper {
  width: 100vw;
  margin-left: calc(-50vw + 50%);
  padding: 3rem 0;
  overflow: hidden;
  position: relative;
}

.carousel-stage {
  position: relative;
  height: 480px;
  perspective: 1200px;
}

.carousel-item {
  position: absolute;
  top: 0;
  left: 50%;
  width: 700px;
  max-width: 80%;
  height: 100%;
  border-radius: 1.5rem;
  background: white;
  box-shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.2);
  transition: all 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #94a3b8;
  font-size: 1.2rem;
  cursor: pointer;
  border: 1px solid rgba(203, 213, 225, 0.5);
  overflow: hidden;
}

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

.carousel-item.active {
  transform: translateX(-50%) scale(1);
  opacity: 1;
  z-index: 10;
  filter: blur(0);
}

.carousel-item.prev {
  transform: translateX(-110%) scale(0.8) rotateY(15deg);
  opacity: 0.5;
  z-index: 5;
  filter: blur(2px);
}

.carousel-item.next {
  transform: translateX(10%) scale(0.8) rotateY(-15deg);
  opacity: 0.5;
  z-index: 5;
  filter: blur(2px);
}

.carousel-item.hide {
  opacity: 0;
  z-index: 1;
  transform: translateX(-50%) scale(0.5);
}

.carousel-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: white;
  border: 1px solid #cbd5e1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 20;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transition: all 0.2s;
}

.carousel-nav:hover {
  background: #0f172a;
  color: white;
  border-color: #0f172a;
}

.carousel-nav.prev-btn {
  left: 15%;
}
.carousel-nav.next-btn {
  right: 15%;
}

/* 通用 Section 样式 */
section.content-section {
  padding: 5rem 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 0.5rem;
}

.section-desc {
  font-size: 1.1rem;
  color: #64748b;
}

/* 平台下载卡片 */
.platforms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.platform-card {
  background: white;
  border: 1px solid rgba(203, 213, 225, 0.5);
  border-radius: 1.5rem;
  padding: 2rem;
  transition: all 0.3s;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
  position: relative;
  overflow: hidden;
}

.platform-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: #0f172a;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.platform-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
}

.platform-card:hover::before {
  transform: scaleX(1);
}

.platform-icon {
  font-size: 2.5rem;
  width: 60px;
  height: 60px;
  background: #f8fafc;
  border-radius: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s;
}

.platform-card:hover .platform-icon {
  transform: scale(1.1) rotate(5deg);
}

.platform-name {
  font-size: 1.3rem;
  font-weight: 700;
  color: #0f172a;
}

.platform-desc {
  font-size: 0.95rem;
  color: #64748b;
  flex-grow: 1;
}

.platform-price {
  font-size: 0.9rem;
  font-weight: 600;
  color: #3b82f6;
  margin-top: 0.5rem;
  padding-top: 1rem;
  border-top: 1px solid #f1f5f9;
  line-height: 1.5;
}

/* 多端展示 Tab 切换区 */
.showcase-section {
  background: white;
  border-radius: 2.5rem;
  padding: 3rem;
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.08);
  border: 1px solid rgba(203, 213, 225, 0.5);
  position: relative;
}

.showcase-tabs {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
  position: relative;
  border-bottom: 2px solid #f1f5f9;
}

.tab-btn {
  padding: 0.8rem 1.8rem;
  border-radius: 0.8rem 0.8rem 0 0;
  border: none;
  background: transparent;
  cursor: pointer;
  font-weight: 600;
  color: #64748b;
  transition: all 0.3s;
  font-size: 1rem;
  position: relative;
  z-index: 2;
}

.tab-btn:hover {
  color: #0f172a;
}
.tab-btn.active {
  color: #0f172a;
}

.tab-indicator {
  position: absolute;
  bottom: -2px;
  height: 3px;
  background: #0f172a;
  border-radius: 3px;
  transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  z-index: 1;
  display: none;
}

.showcase-wrapper {
  position: relative;
  transition: height 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
  overflow: hidden;
}

.showcase-content {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.5s ease,
    transform 0.5s ease;
  pointer-events: none;
}

.showcase-content.active {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
  position: relative;
}

.showcase-text h3 {
  font-size: 1.8rem;
  color: #0f172a;
  margin-bottom: 1rem;
}

.showcase-text p {
  color: #64748b;
  margin-bottom: 1.5rem;
  font-size: 1.05rem;
}

.showcase-img-placeholder {
  background: #f1f5f9;
  border-radius: 1.5rem;
  height: 350px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #94a3b8;
  border: 1px solid #e2e8f0;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.02);
}

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

/* 功能特性网格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: white;
  border: 1px solid rgba(203, 213, 225, 0.5);
  border-radius: 1.5rem;
  padding: 2rem;
  transition: all 0.3s;
}

.feature-card:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
  transform: translateY(-5px);
  box-shadow: 0 20px 25px -15px rgba(0, 0, 0, 0.1);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 1rem;
  background: #0f172a;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.2rem;
  transition: transform 0.3s;
}

.feature-card:hover .feature-icon {
  transform: scale(1.1) rotate(-10deg);
  background: #3b82f6;
}

.feature-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.95rem;
  color: #64748b;
}

/* CTA 区域 */
.cta-section {
  background: white;
  border-radius: 2.2rem;
  padding: 4rem 2rem;
  text-align: center;
  margin: 5rem 0;
  border: 1px solid rgba(203, 213, 225, 0.5);
  box-shadow: 0 30px 50px -20px rgba(0, 0, 0, 0.08);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.cta-section h2 {
  font-size: 2.5rem;
  color: #0f172a;
}

.cta-section p {
  font-size: 1.1rem;
  color: #64748b;
  max-width: 600px;
}

/* 关注与联系区域 */
.contact-section {
  background: white;
  border-radius: 2.2rem;
  padding: 4rem 3rem;
  margin-bottom: 3rem;
  border: 1px solid rgba(203, 213, 225, 0.5);
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.05);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 4rem;
  align-items: center;
}

.contact-info h2 {
  font-size: 2rem;
  color: #0f172a;
  margin-bottom: 1rem;
}

.contact-info p {
  color: #64748b;
  margin-bottom: 2rem;
  font-size: 1.05rem;
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.2rem 1.5rem;
  background: #f8fafc;
  border-radius: 1rem;
  border: 1px solid #e2e8f0;
  transition: all 0.3s;
  text-decoration: none;
  color: inherit;
}

.contact-item:hover {
  background: white;
  border-color: #cbd5e1;
  transform: translateX(5px);
  box-shadow: 0 10px 20px -10px rgba(0, 0, 0, 0.1);
}

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.icon-email {
  background: #fef3c7;
  color: #92400e;
}
.icon-github {
  background: #f1f5f9;
  color: #0f172a;
}

.contact-text strong {
  display: block;
  font-size: 1rem;
  color: #0f172a;
  margin-bottom: 0.2rem;
}

.contact-text span {
  font-size: 0.95rem;
  color: #64748b;
}

.qr-codes {
  display: flex;
  gap: 2rem;
  justify-content: center;
}

.qr-card {
  text-align: center;
  background: #f8fafc;
  padding: 1.5rem;
  border-radius: 1.5rem;
  border: 1px solid #e2e8f0;
  transition: all 0.3s;
}

.qr-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px -10px rgba(0, 0, 0, 0.1);
  background: white;
}

.qr-img-placeholder {
  width: 140px;
  height: 140px;
  background: white;
  border-radius: 0.8rem;
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #94a3b8;
  font-size: 0.85rem;
  border: 1px dashed #cbd5e1;
}

.qr-card p {
  font-weight: 600;
  color: #334155;
  font-size: 0.95rem;
}

.qr-card small {
  color: #94a3b8;
  font-size: 0.8rem;
}

footer {
  text-align: center;
  padding: 3rem 0;
  color: #94a3b8;
  font-size: 0.9rem;
}

/* 动画定义 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 响应式适配 */
@media (max-width: 768px) {
  h1 {
    font-size: 2.2rem;
  }
  .hero-subtitle {
    font-size: 1rem;
  }
  .nav-links a:not(.nav-cta) {
    display: none;
  }
  .nav-container {
    padding: 1rem 1.5rem;
  }
  .nav-placeholder {
    height: 64px;
  }
  .carousel-stage {
    height: 300px;
  }
  .showcase-content.active {
    grid-template-columns: 1fr;
  }
  .showcase-section {
    padding: 1.5rem;
  }
  .carousel-nav.prev-btn {
    left: 5%;
  }
  .carousel-nav.next-btn {
    right: 5%;
  }
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .contact-section {
    padding: 2rem 1.5rem;
  }
  .qr-codes {
    flex-direction: column;
    gap: 1rem;
  }
}

/* 新增：底部链接板块样式 */
.footer-links {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(203, 213, 225, 0.3);
  width: 100%;
  display: flex;
  justify-content: center;
}

.footer-links h4 {
  font-size: 1.1rem;
  color: #334155;
  margin-bottom: 1.2rem;
  text-align: center;
}

.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
  width: 1100px;
}

.link-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.link-group h5 {
  font-size: 0.95rem;
  color: #475569;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.footer-link {
  color: #64748b;
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.footer-link:hover {
  color: #0f172a;
}

.footer-link::before {
  content: "↗";
  font-size: 0.8rem;
}

.copyright {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(203, 213, 225, 0.3);
  font-size: 0.85rem;
  color: #94a3b8;
}

@media (max-width: 768px) {
  .links-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}