/* roulang page: index */
:root {
      --primary: #00E676;
      --primary-dark: #00C853;
      --accent: #FF5722;
      --deep-bg: #0f0f0f;
      --card-bg: rgba(18, 18, 18, 0.9);
      --surface: #1A1A1A;
      --border-light: rgba(255, 255, 255, 0.06);
      --text-dim: #B0B0B0;
      --text-bright: #F0F0F0;
      --white: #FFFFFF;
      --u-gradient: linear-gradient(135deg, #00C853 0%, #00E676 100%);
      --radius-lg: 28px;
      --radius-card: 22px;
      --radius-btn: 50px;
      --shadow-glow: 0 20px 40px -15px rgba(0, 230, 118, 0.25);
      --shadow-card: 0 22px 38px -16px rgba(0, 0, 0, 0.7);
      --transition-smooth: all 0.3s cubic-bezier(0.2, 0.9, 0.4, 1);
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--deep-bg);
    }

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Segoe UI", Roboto, system-ui, sans-serif;
      background: var(--deep-bg);
      color: var(--text-bright);
      line-height: 1.65;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition-smooth);
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    /* 导航 · 沉浸式半透明带赛事播报胶囊 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 999;
      background: rgba(10, 10, 10, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      transition: var(--transition-smooth);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.9rem 2rem;
      max-width: 1340px;
      margin: 0 auto;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .logo-icon {
      width: 42px;
      height: 42px;
      background: var(--u-gradient);
      mask: url('data:image/svg+xml;utf8,<svg viewBox="0 0 40 40" xmlns="http://www.w3.org/2000/svg"><path d="M8 6L24 20L8 34V6Z" fill="white"/><circle cx="26" cy="20" r="8" fill="none" stroke="white" stroke-width="4"/></svg>') center/contain no-repeat;
      -webkit-mask: url('data:image/svg+xml;utf8,<svg viewBox="0 0 40 40" xmlns="http://www.w3.org/2000/svg"><path d="M8 6L24 20L8 34V6Z" fill="white"/><circle cx="26" cy="20" r="8" fill="none" stroke="white" stroke-width="4"/></svg>') center/contain no-repeat;
      background-color: var(--primary);
    }

    .logo-text {
      font-size: 1.7rem;
      font-weight: 750;
      letter-spacing: -0.5px;
      color: white;
      line-height: 1.1;
    }
    .logo-text span {
      color: var(--primary);
      font-weight: 800;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.5rem;
      list-style: none;
    }

    .nav-links a {
      font-weight: 560;
      font-size: 0.95rem;
      color: #ddd;
      position: relative;
      padding: 0.25rem 0;
      transition: 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: white;
    }
    .nav-links a:hover::after,
    .nav-links a:active::after {
      width: 100%;
    }

    .nav-cta {
      background: transparent;
      border: 2px solid var(--primary);
      padding: 0.5rem 1.4rem;
      border-radius: 50px;
      color: var(--primary);
      font-weight: 650;
      transition: 0.25s;
      margin-left: 0.5rem;
    }
    .nav-cta:hover {
      background: var(--primary);
      color: #0f0f0f;
      box-shadow: 0 0 16px rgba(0, 230, 118, 0.7);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 2rem;
      cursor: pointer;
    }

    @media (max-width: 940px) {
      .nav-links {
        position: fixed;
        top: 75px;
        left: 0;
        width: 100%;
        flex-direction: column;
        background: rgba(8, 8, 8, 0.96);
        backdrop-filter: blur(24px);
        padding: 2rem 2rem;
        gap: 2rem;
        transform: translateY(-150%);
        transition: 0.4s ease;
        border-bottom: 1px solid #222;
      }
      .nav-links.open {
        transform: translateY(0);
      }
      .mobile-toggle {
        display: block;
      }
    }

    /* 英雄首屏 */
    .hero {
      display: flex;
      align-items: center;
      min-height: 90vh;
      padding-top: 5rem;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center 42%;
      position: relative;
      isolation: isolate;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(0, 230, 118, 0.15) 0%, #0f0f0f 85%);
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      margin: 2rem 0;
    }
    .hero h1 {
      font-size: clamp(3rem, 7vw, 5.2rem);
      font-weight: 850;
      line-height: 1.12;
      text-transform: none;
      letter-spacing: -0.02em;
      margin-bottom: 1.5rem;
    }
    .highlight {
      background: linear-gradient(to right, #00E676, #A0FF70);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .sub {
      font-size: 1.2rem;
      color: #C0C0C0;
      max-width: 520px;
      margin-bottom: 2.2rem;
   .button-group {
      display: flex;
      gap: 1.3rem;
      flex-wrap: wrap;
    }
    .btn {
      padding: 0.8rem 2.5rem;
      border-radius: 50px;
      font-weight: 650;
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      gap: 0.3rem;
      transition: 0.3s;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-primary {
      background: var(--u-gradient);
      border: none;
      color: #0A0A0A;
      font-weight: 700;
      box-shadow: 0 10px 24px -8px #00C853;
    }
    .btn-primary:hover {
      box-shadow: 0 0 35px var(--primary);
      transform: translateY(-2px);
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-ghost:hover {
      background: var(--primary);
      color: #121212;
    }

    section {
      padding: 6rem 2rem;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 720;
      margin-bottom: 2.8rem;
      display: flex;
      align-items: center;
      gap: 0.7rem;
    }
    .section-title::before {
      content: '';
      height: 36px;
      width: 5px;
      background: var(--primary);
      border-radius: 6px;
    }

    .grid-1-2 {
      display: grid;
      grid-template-columns: 1fr;
      gap: 2rem;
    }
    .feature-wide {
      background: rgba(26,26,26,0.8);
      backdrop-filter: blur(14px);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 30px;
      padding: 2.8rem;
      display: flex;
      flex-wrap: wrap;
      gap: 2rem;
      align-items: center;
    }
    .feature-icon {
      font-size: 3rem;
      background: var(--u-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .two-col {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
    }
    .stat-badge {
      font-size: 2.5rem;
      font-weight: 800;
      color: #FF5722;
    }

    .service-scroll {
      display: flex;
      gap: 1.8rem;
      overflow-x: auto;
      padding: 1rem 0.5rem 2.5rem;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }
   . service-card {
      min-width: 270px;
      flex: 0 0 auto;
      background: #1e1e1e;
      border-radius: 26px;
      padding: 2rem 1.8rem;
      scroll-snap-align: start;
      border: 1px solid #2a2a2a;
      transition: 0.25s;
    }
    .service-card:hover {
      border-color: var(--primary);
      transform: translateY(-8px);
      box-shadow: 0 25px 35px -10px black;
    }

    .faq-item {
      background: #191919;
      border-radius: 16px;
      margin-bottom: 1rem;
      padding: 1.2rem 1.8rem;
      cursor: pointer;
      border-left: 4px solid var(--primary-dark);
    }
    .faq-answer {
      color: #aaa;
      margin-top: 0.8rem;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    .cta-section {
      background: linear-gradient(104deg, #0a0a0a 0%, #003d18 100%);
      text-align: center;
      border-radius: 80px 80px 40px 40px;
    }
    footer {
      background: #050505;
      color: #999;
      padding: 3rem 2rem;
    }