/* roulang page: index */
/* ----- 设计令牌 & 全局重置 ----- */
    :root {
      --primary: #FF4D00;
      --primary-hover: #E64400;
      --accent: #00E5FF;
      --success: #00FF88;
      --bg-dark: #0F0F0F;
      --bg-card: #2A2A2A;
      --bg-footer: #0A0A0A;
      --text-white: #FFFFFF;
      --text-body: #B0B0B0;
      --text-muted: #757575;
      --border-subtle: rgba(255,255,255,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.5);
      --shadow-glow: 0 0 20px rgba(255,77,0,0.5);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-mono: 'DIN Alternate', 'Roboto Condensed', 'Impact', sans-serif;
      --max-width: 1280px;
      --section-gap: 120px;
      --nav-height: 72px;
      transition: all 0.3s ease;
    }

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

    body {
      background-color: var(--bg-dark);
      color: var(--text-body);
      font-family: var(--font-sans);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: all 0.25s ease;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* ----- 导航栏 ----- */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(15, 15, 15, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-subtle);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--text-white);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo-icon {
      display: inline-block;
      width: 28px;
      height: 28px;
      background: var(--primary);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 2L2 22h20L12 2z" fill="white"/></svg>') center/contain no-repeat;
      -webkit-mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 2L2 22h20L12 2z" fill="white"/></svg>') center/contain no-repeat;
      background-color: var(--primary);
    }

    .logo:hover {
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
    }

    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 8px 0;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      letter-spacing: 0.5px;
      box-shadow: 0 4px 12px rgba(255,77,0,0.3);
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: var(--shadow-glow);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: rgba(255,77,0,0.1);
      border-color: var(--primary-hover);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }

    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--text-white);
      transition: 0.3s;
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: rgba(10,10,10,0.98);
        backdrop-filter: blur(25px);
        flex-direction: column;
        justify-content: center;
        gap: 32px;
        transition: right 0.3s ease;
        z-index: 999;
      }
      .nav-links.open {
        right: 0;
      }
      .hamburger {
        display: flex;
        z-index: 1001;
      }
      .nav-cta-desktop {
        display: none;
      }
      .nav-links .btn-primary {
        margin-top: 20px;
        width: fit-content;
      }
    }

    /* ----- Hero ----- */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(ellipse at 50% 0%, rgba(255,77,0,0.15) 0%, transparent 60%);
    }

    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      padding-top: var(--nav-height);
    }

    .hero-text {
      flex: 1;
      max-width: 600px;
    }

    .hero-badge {
      color: var(--accent);
      font-weight: 600;
      font-size: 14px;
      letter-spacing: 1px;
      margin-bottom: 20px;
    }

    .hero h1 {
      font-size: 56px;
      font-weight: 900;
      line-height: 1.2;
      color: var(--text-white);
      letter-spacing: -1px;
      margin-bottom: 24px;
    }

    .hero h1 span {
      color: var(--primary);
    }

    .hero-desc {
      font-size: 18px;
      color: var(--text-body);
      max-width: 500px;
      margin-bottom: 40px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
      position: relative;
    }

    .data-pulse {
      width: 300px;
      height: 300px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(0,229,255,0.1) 0%, transparent 70%);
      position: relative;
      animation: float 6s infinite ease-in-out;
    }

    .pulse-ring {
      position: absolute;
      border: 1px solid rgba(255,77,0,0.4);
      border-radius: 50%;
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% { transform: scale(0.8); opacity: 0.8; }
      100% { transform: scale(1.2); opacity: 0; }
    }

    @keyframes float {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-15px); }
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 42px;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-sub {
      color: var(--text-body);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 60px;
    }

    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .feature-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 40px 32px;
      box-shadow: var(--shadow-card);
      transition: transform 0.25s, box-shadow 0.25s;
      text-align: center;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 8px 40px rgba(255,77,0,0.25);
    }

    .feature-icon {
      font-size: 36px;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: 24px;
      font-weight: 600;
      color: var(--text-white);
      margin-bottom: 14px;
    }

    /* 实时数据 */
    .live-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .data-card {
      background: #1E1E1E;
      border-radius: var(--radius-card);
      padding: 32px;
      border-left: 4px solid var(--accent);
    }

    .data-number {
      font-family: var(--font-mono);
      font-size: 48px;
      font-weight: 800;
      color: var(--accent);
      line-height: 1.1;
    }

    /* 服务交错 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }

    .service-img {
      flex: 1;
      background: #2A2A2A;
      border-radius: var(--radius-card);
      min-height: 280px;
      background-image: url('/assets/images/coverpic/cover-2.webp');
      background-size: cover;
      background-position: center;
    }

    .service-text {
      flex: 1;
    }

    /* 信任计数器 */
    .trust-strip {
      background: #151515;
      display: flex;
      justify-content: space-around;
      text-align: center;
      padding: 50px 0;
      flex-wrap: wrap;
    }

    .counter {
      font-family: var(--font-mono);
      font-size: 48px;
      font-weight: 800;
      color: var(--accent);
    }

    /* FAQ */
    .faq-item {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      padding: 24px;
      font-weight: 600;
      color: var(--text-white);
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 24px;
      color: var(--text-body);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA 横幅 */
    .cta-band {
      background: #1A1A1A;
      text-align: center;
      padding: 80px 0;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0;
    }

    @media (max-width: 1024px) {
      .grid-3, .live-grid { grid-template-columns: repeat(2,1fr); }
      .service-row { flex-direction: column; }
      .hero-content { flex-direction: column; text-align: center; }
      .hero-text { max-width: 100%; }
    }

    @media (max-width: 768px) {
      .grid-3, .live-grid, .footer-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 38px; }
      .section-title { font-size: 32px; }
      .trust-strip { flex-direction: column; gap: 32px; }
    }