:root {
      --bg: #050508;
      --surface: rgba(255, 255, 255, 0.03);
      --surface-glass: rgba(25, 25, 35, 0.4);
      --border: rgba(255, 255, 255, 0.08);
      --primary: #ff6b35;
      --primary-glow: rgba(255, 107, 53, 0.4);
      --text: #ffffff;
      --text-muted: #9ca3af;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      overflow-x: hidden;
      position: relative;
    }

    /* Ambient Background Effects */
    body::before, body::after, .bg-blob {
      content: '';
      position: fixed;
      border-radius: 50%;
      filter: blur(120px);
      z-index: -1;
      pointer-events: none;
      animation: floatBlob 20s ease-in-out infinite alternate;
    }
    body::before {
      width: 600px; height: 600px;
      background: rgba(255, 107, 53, 0.08); /* 橙色渐变 */
      top: -10%; left: -10%;
    }
    body::after {
      width: 500px; height: 500px;
      background: rgba(255, 107, 53, 0.06); /* 橙色渐变 */
      bottom: -10%; right: -5%;
      animation-delay: -5s;
    }
    .bg-blob {
      width: 700px; height: 700px;
      background: rgba(79, 172, 254, 0.05); /* 冷色点缀，避免全屏幕橙色过于刺眼 */
      top: 30%; left: 40%;
      animation-delay: -10s;
    }
    @keyframes floatBlob {
      0% { transform: translate(0, 0) scale(1); }
      50% { transform: translate(5%, 5%) scale(1.1); }
      100% { transform: translate(-5%, -5%) scale(0.9); }
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* Navbar - Capsule Style */
header {
  position: fixed;
  top: 24px; left: 50%;
  transform: translateX(-50%);
  width: max-content;
  z-index: 100;
  background: rgba(25, 25, 35, 0.4);
  backdrop-filter: blur(24px) saturate(1.5);
  -webkit-backdrop-filter: blur(24px) saturate(1.5);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 100px; /* 极大的圆角，确保完全是胶囊形状 */
  padding: 8px 12px 8px 24px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255,255,255,0.1);
  transition: all 0.3s ease;
}
.nav-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 32px;
}
.brand {
  font-family: 'DouyinSansBold', sans-serif;
  font-size: 18px;
  background: linear-gradient(135deg, #fff 0%, var(--primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 1px;
}
.nav-links {
  display: flex;
  gap: 8px;
  align-items: center;
}
.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 30px;
  transition: all 0.3s;
}
.nav-links a:hover {
  color: var(--text);
  background: rgba(255,255,255,0.05);
}
.nav-links a.active {
  color: #fff;
  background: rgba(255,255,255,0.1);
}
.nav-links a.download-btn {
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  padding: 8px 20px;
  box-shadow: 0 4px 12px var(--primary-glow);
}
.nav-links a.download-btn:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px var(--primary-glow);
}

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      text-align: center;
      position: relative;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 16px;
      background: rgba(255, 107, 53, 0.1);
      border: 1px solid rgba(255, 107, 53, 0.3);
      border-radius: 100px;
      font-size: 14px;
      color: var(--primary);
      margin-bottom: 32px;
      box-shadow: 0 0 20px rgba(255, 107, 53, 0.15);
      backdrop-filter: blur(10px);
    }
    .badge-dot {
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      box-shadow: 0 0 10px var(--primary);
      animation: pulseDot 2s infinite;
    }
    @keyframes pulseDot {
      0% { transform: scale(0.95); opacity: 0.5; }
      50% { transform: scale(1.2); opacity: 1; }
      100% { transform: scale(0.95); opacity: 0.5; }
    }
    .hero h1 {
      font-family: 'DouyinSansBold', sans-serif;
      font-size: 84px;
      line-height: 1.1;
      margin-bottom: 24px;
      letter-spacing: 2px;
      color: #fff;
      /* 3D 文字及发光效果 */
      text-shadow: 
        0 1px 0 #cccccc,
        0 2px 0 #c9c9c9,
        0 3px 0 #bbbbbb,
        0 4px 0 #b9b9b9,
        0 5px 0 #aaaaaa,
        0 6px 1px rgba(0,0,0,0.1),
        0 0 5px rgba(0,0,0,0.1),
        0 1px 3px rgba(0,0,0,0.3),
        0 3px 5px rgba(0,0,0,0.2),
        0 5px 10px rgba(0,0,0,0.25),
        0 10px 10px rgba(0,0,0,0.2),
        0 20px 20px rgba(0,0,0,0.15),
        0 0 40px rgba(255, 107, 53, 0.6); /* 橙色发光光晕 */
    }
    .hero p {
      font-size: 20px;
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto 48px;
    }
    .downloads {
      display: flex;
      justify-content: center;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn {
      position: relative;
      overflow: hidden;
      display: inline-flex;
      align-items: center;
      gap: 12px;
      padding: 16px 36px;
      border-radius: 32px;
      font-size: 16px;
      font-weight: 600;
      text-decoration: none;
      transition: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
      z-index: 1;
    }
    .btn::before {
      content: '';
      position: absolute;
      top: 0; left: -100%;
      width: 50%; height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255,255,255,0.25), transparent);
      transform: skewX(-20deg);
      z-index: -1;
      transition: none;
    }
    .btn:hover::before {
      animation: btnShine 0.7s ease forwards;
    }
    @keyframes btnShine {
      100% { left: 150%; }
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      box-shadow: 0 8px 24px var(--primary-glow);
    }
    .btn-primary:hover {
      transform: translateY(-4px) scale(1.02);
      box-shadow: 0 16px 32px rgba(255, 107, 53, 0.5);
    }
    .btn-secondary {
      background: var(--surface-glass);
      color: var(--text);
      border: 1px solid var(--border);
      backdrop-filter: blur(12px);
    }
    .btn-secondary:hover {
      background: rgba(255, 255, 255, 0.1);
      transform: translateY(-4px) scale(1.02);
      border-color: rgba(255,255,255,0.2);
    }
    .btn svg {
      width: 24px;
      height: 24px;
      fill: currentColor;
      transition: transform 0.3s;
    }
    .btn:hover svg {
      transform: translateY(-2px);
    }

    /* Showcase */
    .showcase {
      margin-top: 80px;
      perspective: 1000px;
      position: relative;
    }
    .showcase::after {
      content: '';
      position: absolute;
      bottom: -20px; left: 10%; right: 10%;
      height: 40px;
      background: var(--primary);
      filter: blur(80px);
      opacity: 0.3;
      z-index: -1;
      transition: opacity 0.5s ease;
    }
    .showcase:hover::after {
      opacity: 0.6;
    }
    .showcase-img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 20px;
      border: 1px solid rgba(255,255,255,0.1);
      box-shadow: 0 30px 60px rgba(0,0,0,0.6);
      transform: rotateX(8deg) scale(0.95);
      transition: all 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
    }
    .showcase:hover .showcase-img {
      transform: rotateX(0deg) scale(1.02) translateY(-10px);
      border-color: rgba(255, 107, 53, 0.3);
      box-shadow: 0 40px 80px rgba(0,0,0,0.8), 0 0 40px rgba(255, 107, 53, 0.2);
    }

    /* Scroll Reveal Animations */
    .reveal {
      opacity: 0;
      transform: translateY(50px) scale(0.96);
      filter: blur(12px);
      transition: opacity 1s cubic-bezier(0.22, 1, 0.36, 1),
                  transform 1s cubic-bezier(0.22, 1, 0.36, 1),
                  filter 1s cubic-bezier(0.22, 1, 0.36, 1);
      will-change: opacity, transform, filter;
    }
    .reveal.active {
      opacity: 1;
      transform: translateY(0) scale(1);
      filter: blur(0);
    }
    .reveal-delay-1 { transition-delay: 0.1s; }
    .reveal-delay-2 { transition-delay: 0.2s; }
    .reveal-delay-3 { transition-delay: 0.3s; }

    /* Features */
    .features {
      padding: 120px 0;
    }
    .section-title {
      text-align: center;
      font-family: 'DouyinSansBold', sans-serif;
      font-size: 42px;
      margin-bottom: 80px;
    }
    .feature-grid {
      display: flex;
      flex-direction: column;
      gap: 100px;
      align-items: center;
    }
    @keyframes floatCard {
      0% { transform: translateY(0) rotateX(2deg) rotateY(-1deg); }
      50% { transform: translateY(-15px) rotateX(-2deg) rotateY(1deg); }
      100% { transform: translateY(0) rotateX(2deg) rotateY(-1deg); }
    }
    @keyframes pulseGlow {
      0% { opacity: 0.1; transform: translate(-50%, -50%) translateZ(-100px) scale(1); }
      50% { opacity: 0.3; transform: translate(-50%, -50%) translateZ(-100px) scale(1.1); }
      100% { opacity: 0.1; transform: translate(-50%, -50%) translateZ(-100px) scale(1); }
    }
    @keyframes floatTitle {
      0% { transform: translateZ(30px) scale(1); }
      50% { transform: translateZ(50px) scale(1.05); }
      100% { transform: translateZ(30px) scale(1); }
    }

    .feature-card {
      width: 100%;
      max-width: 960px;
      position: relative;
      perspective: 1200px;
      /* 移除 hover transition，全靠 animation 控制 */
    }
    .feature-card::before {
      content: '';
      position: absolute;
      top: 50%; left: 50%;
      width: 90%; height: 90%;
      background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
      filter: blur(100px);
      opacity: 0;
      transform: translate(-50%, -50%) translateZ(-100px);
      z-index: -1;
      pointer-events: none;
    }
    
    /* 当滚动进入视口 (.active) 时自动播放动画 */
    .feature-card.active .feature-card-img {
      animation: floatCard 6s ease-in-out infinite;
      border-color: rgba(255, 107, 53, 0.4);
      box-shadow: 0 40px 100px rgba(0,0,0,0.8), 0 0 60px rgba(255, 107, 53, 0.25);
    }
    .feature-card.active::before {
      animation: pulseGlow 4s ease-in-out infinite;
    }
    .feature-card.active h3 {
      animation: floatTitle 6s ease-in-out infinite;
      color: #fff;
    }

    .feature-card h3 {
      font-family: 'DouyinSansBold', -apple-system, sans-serif;
      font-size: 22px;
      font-weight: 600;
      letter-spacing: 2px;
      margin-bottom: 24px;
      color: #fff;
      text-align: center;
      text-shadow: 0 4px 20px rgba(0,0,0,0.8);
      transform: translateZ(30px);
    }
    .feature-card h3 span {
      color: var(--primary);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      font-weight: 800;
      margin-right: 12px;
      opacity: 0.9;
      text-shadow: 0 0 15px rgba(255, 107, 53, 0.6);
    }
    .feature-card-img {
      width: 100%;
      height: auto;
      border-radius: 24px;
      display: block;
      border: 1px solid rgba(255,255,255,0.06);
      box-shadow: 0 20px 40px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.05) inset;
      transform-style: preserve-3d;
    }
    .feature-disclaimer {
      font-size: 12px;
      color: rgba(255, 255, 255, 0.3);
      border-top: 1px solid rgba(255,255,255,0.05);
      padding-top: 16px;
    }

    /* Beta Note */
    .beta-note {
      text-align: center;
      margin: 40px auto 100px;
      max-width: 800px;
      padding: 24px;
      background: rgba(255, 107, 53, 0.05);
      border: 1px solid rgba(255, 107, 53, 0.2);
      border-radius: 16px;
      color: var(--text-muted);
      font-size: 14px;
    }

    /* Footer */
    footer {
      border-top: 1px solid var(--border);
      padding: 60px 0 40px;
      background: rgba(5, 5, 8, 0.8);
      backdrop-filter: blur(20px);
      margin-top: 80px;
    }
    .footer-content {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand h2 {
      font-family: 'DouyinSansBold', sans-serif;
      font-size: 24px;
      margin-bottom: 16px;
      background: linear-gradient(135deg, #fff 0%, var(--primary) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .footer-brand p {
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.8;
      max-width: 300px;
    }
    .footer-links h3 {
      font-size: 16px;
      margin-bottom: 20px;
      color: #fff;
    }
    .footer-links ul {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 12px;
    }
    .footer-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 14px;
      transition: color 0.3s;
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      border-top: 1px solid var(--border);
      padding-top: 24px;
      text-align: center;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .footer-bottom p {
      color: var(--text-muted);
      font-size: 14px;
    }
    .footer-disclaimer {
      font-size: 12px !important;
      color: rgba(255, 255, 255, 0.3) !important;
      max-width: 800px;
      margin: 0 auto;
      line-height: 1.6;
    }
    @media (max-width: 768px) {
      /* Navbar */
      header {
        width: 90%;
        padding: 8px 16px;
      }
      .nav-links a {
        padding: 6px 10px;
        font-size: 13px;
      }
      .nav-links a.download-btn {
        padding: 6px 12px;
      }

      /* Hero */
      .hero {
        padding: 100px 0 40px;
      }
      .hero-badge {
        font-size: 12px;
        padding: 6px 12px;
        margin-bottom: 24px;
      }
      .hero h1 {
        font-size: 40px;
        line-height: 1.1;
      }
      .hero p {
        font-size: 15px;
        padding: 0 16px;
        margin-bottom: 32px;
      }
      .downloads {
        flex-direction: column;
        padding: 0 24px;
        gap: 16px;
      }
      .btn {
        width: 100%;
        justify-content: center;
      }

      /* Showcase */
      .showcase {
        margin-top: 40px;
      }
      .showcase-img {
        width: 110%; /* 图片满边效果 */
        max-width: none;
        margin-left: -5%;
        border-radius: 12px;
      }

      /* Features */
      .section-title {
        font-size: 32px;
        margin-bottom: 40px;
      }
      .feature-card h3 {
        font-size: 18px;
      }
      .feature-card-img {
        border-radius: 16px;
      }

      /* Footer */
      .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 32px;
      }
      .footer-brand p {
        margin: 0 auto;
      }
    }