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

html, body {
  overflow: hidden;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  background: #0a1628;
  color: #fff;
}

.bg-light {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.bg-light::before {
  content: '';
  position: absolute;
  top: -20%;
  left: -10%;
  width: 60%;
  height: 140%;
  background: linear-gradient(135deg, transparent 0%, rgba(30, 100, 180, 0.15) 30%, rgba(60, 160, 220, 0.08) 50%, transparent 70%);
  transform: rotate(-15deg);
}

.bg-light::after {
  content: '';
  position: absolute;
  bottom: -20%;
  right: -10%;
  width: 60%;
  height: 140%;
  background: linear-gradient(135deg, transparent 0%, rgba(30, 100, 180, 0.12) 30%, rgba(60, 160, 220, 0.06) 50%, transparent 70%);
  transform: rotate(-15deg);
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 50px;
  z-index: 200;
  background: linear-gradient(180deg, rgba(10, 22, 40, 0.9) 0%, transparent 100%);
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #fff;
}

.navbar-logo img {
  height: 40px;
}

.navbar-logo-text {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 1px;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: 35px;
  list-style: none;
}

.navbar-menu a {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  font-size: 15px;
  transition: color 0.3s;
  position: relative;
}

.navbar-menu a:hover,
.navbar-menu a.active {
  color: #fff;
}

.navbar-menu a.active::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 100%;
  height: 2px;
  background: #4fc3f7;
  border-radius: 1px;
}

.fullpage-container {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

.fullpage-wrapper {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fullpage-section {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

.section-hero {
  
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding-top: 70px;

  align-items: center;
  background-position: 50%;
  background-repeat: no-repeat;
  background-size: 100% 100%;
  color: #fff;
  display: flex;
  justify-content: center;
}

.hero-title {
  font-size: 56px;
  font-weight: 900;
  color: #4fc3f7;
  text-align: center;
  margin-bottom: 30px;
  letter-spacing: 4px;
  text-shadow: 0 0 30px rgba(79, 195, 247, 0.3);
}

.carousel-3d-wrapper {
  position: relative;
  width: 100%;
  min-width: 700px;
  max-width: 1440px;
  max-height: 450px;
  aspect-ratio: 16 / 9;
  perspective: 1800px;
}

.carousel-3d-slide {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 50%;
  padding-bottom: 28.125%;
  margin-left: -25%;
  margin-top: -14.0625%;
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.carousel-3d-slide-inner {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.carousel-3d-slide img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.carousel-3d-placeholder {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #1a2a4a 0%, #0d1b30 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: max(12px, 2vw);
  color: rgba(255,255,255,0.4);
  border: 1px solid rgba(255,255,255,0.1);
}

.carousel-3d-slide.position-center {
  transform: translateX(0) translateZ(0) scale(1);
  z-index: 30;
  opacity: 1;
}

.carousel-3d-slide.position-left {
  transform: translateX(-300px) translateZ(-200px) scale(0.85) rotateY(15deg);
  z-index: 20;
  opacity: 0.7;
}

.carousel-3d-slide.position-right {
  transform: translateX(300px) translateZ(-200px) scale(0.85) rotateY(-15deg);
  z-index: 20;
  opacity: 0.7;
}

.carousel-3d-slide.position-hidden {
  transform: translateX(0) translateZ(-400px) scale(0.7);
  z-index: 10;
  opacity: 0;
  pointer-events: none;
}

.carousel-tag {
  position: absolute;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  z-index: 40;
  cursor: pointer;
  transition: transform 0.3s, box-shadow 0.3s;
  white-space: nowrap;
}

.carousel-tag:hover {
  transform: scale(1.08);
}

.tag-performance {
  background: linear-gradient(135deg, #e53935, #c62828);
  top: 30%;
  left: 18%;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 4px 20px rgba(229, 57, 53, 0.4);
}

.tag-performance .tag-icon {
  width: 0;
  height: 0;
  border-left: 12px solid #ffeb3b;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
}

.tag-mod {
  background: linear-gradient(135deg, #7c4dff, #651fff);
  top: 22%;
  right: 18%;
  box-shadow: 0 4px 20px rgba(124, 77, 255, 0.4);
}

.tag-guide {
  background: linear-gradient(135deg, #00c853, #00a844);
  bottom: 25%;
  right: 22%;
  box-shadow: 0 4px 20px rgba(0, 200, 83, 0.4);
}

.carousel-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 50;
  transition: transform 0.3s;
}

.carousel-arrow img {
    width: 100%;
}

.carousel-arrow:hover {
  transform: translateY(-50%) scale(1.15);
}

.carousel-arrow-left { left: 10px; }
.carousel-arrow-right { right: 10px; }

.carousel-dots {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 25px;
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0);
  border: 2px solid rgba(255, 255, 255, 0.4);
  cursor: pointer;
  transition: all 0.3s;
  position: relative;
  box-shadow: none;
}

.carousel-dot::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
  transition: all 0.5s ease;
}

.carousel-dot::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  transition: all 0.6s ease 0.1s;
}

.carousel-dot.active {
  width: 10px;
  height: 10px;
  background: #fff;
  border-color: #fff;
  box-shadow: 
    0 0 8px rgba(255, 255, 255, 0.8),
    0 0 16px rgba(255, 255, 255, 0.5),
    0 0 24px rgba(255, 255, 255, 0.3);
}

.carousel-dot.active::after {
  width: 24px;
  height: 24px;
  background: rgba(255, 255, 255, 0.25);
}

.carousel-dot.active::before {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
}

.download-section {
  margin-top: 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.download-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 320px;
  height: 50px;
  background: linear-gradient(90deg, #6dd5ed, #2193b0);
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  box-shadow: none;
  text-decoration: none;
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(79, 195, 247, 0.5);
}

.download-links {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 14px;
}

.download-links a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color 0.3s;
}

.download-links a:hover {
  color: #4fc3f7;
}

.download-links .divider {
  color: rgba(255, 255, 255, 0.3);
}

.deco-redpacket {
  position: absolute;
  z-index: 999;
  pointer-events: none;
}

.deco-redpacket-1 {
  top: 0px;
  left: 120px;
  width: 100px;
  height: 100px;
  animation: floatUp 3s ease-in-out infinite;
}

.deco-redpacket-2 {
  bottom: 0px;
  right: 150px;
  width: 100px;
  height: 100px;
  animation: floatUp 3.5s ease-in-out infinite 0.5s;
}

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

.deco-tt-mascot {
  position: absolute;
  bottom: 0px;
  left: 180px;
  width: 100px;
  height: 100px;
  z-index: 999;
  animation: floatUp 4s ease-in-out infinite 1s;
}

.deco-tt-mascot img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

@keyframes floatUp {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.section-feature {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 80px;
  position: relative;
}

.section-feature {
  align-items: center;
  background-position: 50%;
  background-repeat: no-repeat;
  background-size: 100% 100%;
  color: #fff;
  display: flex;
  justify-content: center;
}
.section-feature:nth-child(odd) {
   background-image: url(https://ga-album-cdnqn.52tt.com/web/tt-desktop-fast-official/20260205163640_38006457.png);
}

.section-feature:nth-child(even) {
  background-image: url(https://ga-album-cdnqn.52tt.com/web/tt-desktop-fast-official/20260205163623_47553084.png);
}

.feature-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1400px;
  width: 100%;
  gap: 80px;
}

.feature-layout.reverse {
  flex-direction: row-reverse;
}

.feature-image-wrap {
  flex: 1;
  max-width: 650px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
  opacity: 0;
  transform: translateX(-60px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-layout.reverse .feature-image-wrap {
  transform: translateX(60px);
}

.feature-image-wrap img {
  width: 100%;
  height: auto;
  display: block;
}

.feature-image-placeholder {
  width: 100%;
  height: 420px;
  background: linear-gradient(135deg, #1a2a4a 0%, #0d1b30 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: rgba(255,255,255,0.4);
  border: 1px solid rgba(255,255,255,0.1);
}

.feature-text-wrap {
  flex: 1;
  max-width: 500px;
  opacity: 0;
  transform: translateX(60px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.2s;
}

.feature-layout.reverse .feature-text-wrap {
  transform: translateX(-60px);
}

.feature-title {
  font-size: 52px;
  font-weight: 900;
  color: #fff;
  margin-bottom: 20px;
  letter-spacing: 2px;
  line-height: 1.2;
}

.feature-desc {
  font-size: 22px;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.6;
}

.fullpage-section.active .feature-image-wrap {
  opacity: 1;
  transform: translateX(0);
}

.fullpage-section.active .feature-text-wrap {
  opacity: 1;
  transform: translateX(0);
}

.side-nav {
  position: fixed;
  right: 40px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 16px;
  z-index: 150;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}

.side-nav.visible {
  opacity: 1;
  pointer-events: auto;
}

.side-nav-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0);
  border: 2px solid rgba(255, 255, 255, 0.4);
  cursor: pointer;
  transition: all 0.3s;
  position: relative;
  box-shadow: none;
}

.side-nav-dot::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  box-shadow: 
    0 0 0 0 rgba(255, 255, 255, 0.4),
    0 0 0 0 rgba(255, 255, 255, 0.3),
    0 0 0 0 rgba(255, 255, 255, 0.2);
  transition: all 0.5s ease;
}

.side-nav-dot::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transition: all 0.6s ease 0.1s;
}

.side-nav-dot.active {
  width: 10px;
  height: 10px;
  background: #fff;
  border-color: #fff;
  box-shadow: 
    0 0 8px rgba(255, 255, 255, 0.8),
    0 0 16px rgba(255, 255, 255, 0.5),
    0 0 24px rgba(255, 255, 255, 0.3);
}

.side-nav-dot.active::after {
  width: 24px;
  height: 24px;
  background: rgba(255, 255, 255, 0.25);
  box-shadow: 
    0 0 10px rgba(255, 255, 255, 0.5),
    0 0 20px rgba(255, 255, 255, 0.3),
    0 0 30px rgba(255, 255, 255, 0.2);
}

.side-nav-dot.active::before {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
}

.side-nav-dot:hover {
  background: rgba(255, 255, 255, 0.6);
}

.footer-right {
  position: fixed;
  bottom: 30px;
  right: 40px;
  z-index: 150;
  text-align: center;
}

.footer-right-title {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
  letter-spacing: 2px;
}

.footer-right-subtitle {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 10px;
  letter-spacing: 1px;
}

.footer-right-qr {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.1);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.8);
  cursor: pointer;
  transition: background 0.3s;
}

.footer-right-qr:hover {
  background: rgba(255, 255, 255, 0.2);
}

.footer-right-qr .qr-icon {
  width: 16px;
  height: 16px;
  background: rgba(255,255,255,0.6);
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
}

.footer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.8) 100%);
  padding: 40px 0 20px;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.footer.visible {
  opacity: 1;
  pointer-events: auto;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 50px;
}

.footer-info {
  text-align: center;
}

.footer-info p {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 8px;
  line-height: 1.6;
}

.footer-info p:last-child {
  margin-bottom: 0;
}

@media (max-width: 1024px) {
  .hero-title { font-size: 42px; }
  .carousel-3d-slide.position-left {
    transform: translateX(-24vw) translateZ(-150px) scale(0.85) rotateY(15deg);
  }
  .carousel-3d-slide.position-right {
    transform: translateX(24vw) translateZ(-150px) scale(0.85) rotateY(-15deg);
  }
  .feature-title { font-size: 40px; }
  .feature-desc { font-size: 18px; }
  .section-feature { padding: 0 40px; }
}

@media (max-width: 768px) {
  .navbar { padding: 0 20px; }
  .navbar-menu { gap: 15px; }
  .navbar-menu a { font-size: 13px; }
  .hero-title { font-size: 32px; }
  .carousel-3d-slide.position-left {
    transform: translateX(-18vw) translateZ(-120px) scale(0.85) rotateY(15deg);
  }
  .carousel-3d-slide.position-right {
    transform: translateX(18vw) translateZ(-120px) scale(0.85) rotateY(-15deg);
  }
  .carousel-arrow { display: none; }
  .deco-redpacket, .deco-tt-mascot { display: none; }
  .feature-layout, .feature-layout.reverse {
    flex-direction: column;
    gap: 30px;
  }
  .feature-title { font-size: 28px; }
  .feature-desc { font-size: 16px; }
  .section-feature { padding: 0 20px; }
  .side-nav { right: 15px; }
  .footer-right { right: 15px; bottom: 15px; }
}

.dl-box-btn {
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: linear-gradient(280deg,#00c8ff,#9aebff);
  border-radius: 8px;
  color: #1e1f21;
  cursor: pointer;
  display: flex;
  font-family: "AlibabaPuHuiTi-3-75-SemiBold",sans-serif;
  font-size: 24px;
  font-weight: 700;
  height: 65px;
  width: 420px;
  text-decoration: none;
}

.dl-box-btn img {
  width: 32px;
  height: 32px;
  object-fit: contain;
  flex-shrink: 0;
}

.dl-box-btn span {
  line-height: 1;
  vertical-align: middle;
}