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

    body {
      font-family: 'Helvetica Neue', 'Inter', system-ui, sans-serif;
      background: #0a0a0a;
      color: #fff;
      overflow-x: hidden;
    }

    .scroll-container {
      display: flex;
      flex-direction: column;
    }

    .section {
      width: 100%;
      min-height: 100vh;
      position: relative;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      padding: 2rem;
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 1s cubic-bezier(0.2, 0.9, 0.3, 1), transform 1s cubic-bezier(0.2, 0.9, 0.3, 1);
      will-change: opacity, transform;
      overflow: hidden;
    }

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

    .nav {
      position: absolute;
      top: 2rem;
      left: 2rem;
      z-index: 999;
      display: flex;
      gap: 1.2rem;
      align-items: center;
    }

    .nav a {
      display: inline-block;
      background: #000000;
      color: #ffffff;
      text-decoration: none;
      font-weight: 600;
      font-size: 0.9rem;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      padding: 0.7rem 1.6rem;
      border-radius: 40px;
      border: 1px solid rgba(255, 255, 255, 0.2);
      transition: all 0.3s ease;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
      white-space: nowrap;
    }

    .nav a:hover {
      background: #ffffff;
      color: #000000;
      border-color: #ffffff;
      transform: scale(1.05);
      box-shadow: 0 0 25px rgba(255, 255, 255, 0.3);
    }

    .video-section {
      padding: 0;
      position: relative;
      justify-content: center;
      align-items: flex-start;
      display: flex;
    }

    .video-bg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: 0;
    }

    .video-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 1;
    }

    .video-big-text {
      position: relative;
      z-index: 2;
      margin-left: 8%;
      max-width: 70%;
      text-align: left;
      padding-top: 10vh;
    }

    .video-big-text h1 {
      font-size: 6.5rem;
      font-weight: 800;
      letter-spacing: -0.03em;
      line-height: 1.05;
      text-transform: uppercase;
      text-shadow: 0 10px 50px rgba(0, 0, 0, 0.7);
      color: #fff;
    }

    .video-big-text p {
      font-size: 1.4rem;
      font-weight: 300;
      letter-spacing: 4px;
      margin-top: 1.5rem;
      opacity: 0.85;
      text-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
    }

    .longboard-section {
      background: #111;
      padding: 0;
      justify-content: flex-start;
      overflow: hidden;
    }

    .longboard-bg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: 0;
    }

    .longboard-content {
      position: relative;
      z-index: 2;
      width: 100%;
      height: 300vh;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 6rem 4rem 4rem 4rem;
    }

    .marquee {
      width: 100%;
      overflow: hidden;
      white-space: nowrap;
      margin-top: 3rem;
      align-self: flex-start;
    }

    .marquee span {
      display: inline-block;
      font-size: 3rem;
      font-weight: 700;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      animation: scrollText 20s linear infinite;
      color: rgba(255, 255, 255, 0.9);
      text-shadow: 0 0 30px rgba(255, 255, 255, 0.3);
    }

    @keyframes scrollText {
      0% { transform: translateX(0); }
      100% { transform: translateX(-50%); }
    }

    .middle-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      margin-top: auto;
      margin-bottom: 2rem;
      flex-wrap: wrap;
      gap: 2rem;
    }

    .middle-left-eng {
      font-size: 2.5rem;
      font-weight: 600;
      letter-spacing: -0.01em;
      max-width: 50%;
      line-height: 1.3;
      text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    }

    .middle-right {
      align-items: center;
      gap: 2rem;
      text-align: right;
    }

    .middle-right-eng {
      font-size: 1.5rem;
      font-weight: 400;
      opacity: 0.9;
      letter-spacing: 0.02em;
    }

    .btn {
      display: inline-block;
      padding: 1rem 4.5rem;
      border-radius: 40px;
      color: white;
      font-weight: 500;
      text-decoration: none;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      font-size: 1.2rem;
      transition: background 0.3s, color 0.3s, transform 0.3s;
      background: black;
      cursor: pointer;
      backdrop-filter: blur(4px);
      white-space: nowrap;
    }

    .btn:hover {
      background: #fff;
      color: #000;
      transform: scale(1.02);
    }

    .bottom-left {
      align-items: center;
      gap: 2rem;
      margin-bottom: 1rem;
    }

    .bottom-left-eng {
      font-size: 1.25rem;
      font-weight: 400;
      opacity: 0.8;
      letter-spacing: 0.03em;
    }

    .dot.active {
      background: #fff;
      transform: scale(1.3);
    }

    .big-section {
      background: #0b0b0b;
      justify-content: flex-start;
      align-items: flex-end;
      padding: 4rem 6rem;
      background-image: linear-gradient(145deg, #181818 0%, #0a0a0a 100%);
    }

    .big-top-right {
      position: absolute;
      top: 6rem;
      right: 6rem;
      text-align: right;
      max-width: 600px;
    }

    .big-top-right h2 {
      font-size: 4rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.1;
      margin-bottom: 1.5rem;
      text-shadow: 0 8px 40px rgba(0, 0, 0, 0.8);
    }

    .big-bottom-btn {
      margin-top: auto;
      align-self: flex-start;
    }

    .big-bottom-btn .btn {
      padding: 1.2rem 3.5rem;
      font-size: 1rem;
      border-width: 2px;
    }

    .split-section {
      min-height: 30vh;
      flex-direction: row;
      gap: 3rem;
      background: #0d0d0d;
      padding: 3rem 6rem;
      align-items: center;
      justify-content: center;
    }

    .split-left {
      flex: 1;
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .split-left-item {
      font-size: 2rem;
      font-weight: 900;
      letter-spacing: 0.05em;
      opacity: 0.85;
      color: black;
      font-family: "新宋体";
      text-transform: uppercase;
    }

    .split-divider {
      width: 2px;
      height: 60px;
      background: black;
      border-radius: 2px;
      box-shadow: 0 0 20px rgba(255, 255, 255, 0.15);
      flex-shrink: 0;
    }

    .split-right {
      flex: 0 0 auto;
      font-size: 3rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      text-align: left;
    }


    @media (max-width: 1024px) {
      .nav {
        top: 1rem;
        left: 1rem;
        gap: 0.8rem;
      }
      .nav a {
        font-size: 0.75rem;
        padding: 0.5rem 1rem;
      }
      .video-big-text h1 { font-size: 4rem; }
      .video-big-text { margin-left: 6%; }
      .longboard-content { padding: 5rem 2rem 2rem 2rem; }
      .middle-left-eng { font-size: 1.8rem; max-width: 100%; }
      .middle-right-eng { font-size: 1.2rem; }
      .slide { padding: 2rem 3rem; flex-direction: column; justify-content: center; gap: 2rem; text-align: center; }
      .slide-left, .slide-right { max-width: 100%; text-align: center; font-size: 2rem; }
      .big-top-right { position: relative; top: auto; right: auto; text-align: left; margin-bottom: 3rem; max-width: 100%; }
      .big-top-right h2 { font-size: 2.5rem; }
      .big-section { align-items: flex-start; padding: 4rem 2rem; }
      .split-section { flex-direction: column; gap: 1.5rem; padding: 4rem 2rem; }
      .split-left, .split-right { text-align: center; font-size: 2rem; }
      .split-divider { width: 200px; height: 2px; }
    }

    @media (max-width: 600px) {
      .nav {
        gap: 0.5rem;
        flex-wrap: wrap;
        max-width: 80%;
      }
      .nav a {
        font-size: 0.65rem;
        padding: 0.4rem 0.9rem;
        letter-spacing: 1px;
      }
      .video-big-text h1 { font-size: 2.6rem; }
      .video-big-text p { font-size: 1rem; letter-spacing: 2px; }
      .video-big-text { margin-left: 5%; }
      .marquee span { font-size: 2rem; }
      .middle-row { flex-direction: column; align-items: flex-start; }
      .middle-right { flex-direction: column; align-items: flex-start; gap: 1rem; }
      .middle-right-eng { font-size: 1rem; }
      .btn { padding: 0.8rem 1.8rem; font-size: 0.8rem; }
      .slide-left { font-size: 1.8rem; }
      .big-top-right h2 { font-size: 2rem; }
      .split-left, .split-right { font-size: 1.8rem; }
    }
    .slider-section {
      padding: 0;
      justify-content: center;
      overflow: hidden;
    }

    .slider-bg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: 0;
    }

    .slider-text-container {
      position: relative;
      z-index: 2;
      width: 100%;
      height: 100vh;
      overflow: hidden;
    }

    .slider-container {
      width: 100%;
      height: 100vh;
      display: flex;
      transition: transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      will-change: transform;
    }

    .slide {
      flex: 0 0 100vw;
      height: 100vh;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 4rem 6rem;
    }

    .slide-left {
      font-size: 1rem;
      letter-spacing: -0.02em;
      color: crimson;
      max-width: 50%;
      line-height: 1.2;
      text-shadow: 0 8px 40px rgba(0, 0, 0, 0.9);
    }

    .slide-right {
      font-size: 1.25rem;
      font-weight: 300;
      color: crimson;
      max-width: 40%;
      text-align: right;
      line-height: 1.6;
      letter-spacing: 0.02em;
      text-shadow: 0 4px 20px rgba(0, 0, 0, 0.9);
    }

    .slider-dots {
      position: absolute;
      bottom: 2.5rem;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      gap: 1rem;
      z-index: 10;
    }

    .dot {
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.3);
      transition: background 0.3s, transform 0.3s;
      cursor: pointer;
    }

    .dot.active {
      background: #fff;
      transform: scale(1.3);
    }

    .big-section {
      padding: 0;
      justify-content: flex-start;
      align-items: flex-end;
      background: #0b0b0b;
      overflow: hidden;
    }

    .big-bg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: 0;
    }
    .big-content {
      position: relative;
      z-index: 2;
      width: 100%;
      height: 100vh;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 4rem 6rem;
    }

    .big-top-right {
      align-self: flex-end;
      text-align: right;
      max-width: 600px;
      margin-top: 6rem;
    }

    .big-top-right h2 {
      font-size: 4rem;
      font-weight: 700;
      line-height: 1.1;
    }

    .big-bottom-btn {
      align-self: flex-start;
      margin-bottom: 2rem;
    }

    .big-bottom-btn .btn {
      padding: 1.2rem 3.5rem;
      font-size: 1rem;
      border-width: 2px;
    }

    .split-section {
      background: url(../images/b8418ebf64a88a54f78a514621a70af8.png);
      height: 100px;
    }
    .split-left {
      text-align: right;
    }

    .split-right {
      text-align: left;
    }

    .split-divider {
      width: 2px;
      height: 200px;
      background: rgba(255, 255, 255, 0.25);
      border-radius: 2px;
      box-shadow: 0 0 20px rgba(255, 255, 255, 0.15);
    }