/* roulang page: index */
:root {
      --primary: #E8380D;
      --primary-dark: #C62E0B;
      --secondary: #1A1A2E;
      --accent: #00C49A;
      --light-bg: #F5F5F7;
      --white: #FFFFFF;
      --text-dark: #1A1A2E;
      --text-muted: #5C5C6E;
      --shadow-card: 0 2px 12px rgba(26,26,46,0.06);
      --shadow-card-hover: 0 8px 24px rgba(232,56,13,0.12);
      --border-radius-card: 12px;
      --border-radius-btn: 8px;
      --transition: 0.25s ease;
      --font-en: 'Inter', sans-serif;
      --font-zh: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --container-max: 1280px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-zh);
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-dark);
      background-color: var(--white);
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button {
      background: none;
      border: none;
      cursor: pointer;
      font-family: inherit;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(26, 26, 46, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      height: 72px;
    }
    .logo {
      font-family: var(--font-en);
      font-weight: 800;
      font-size: 26px;
      letter-spacing: 1px;
      color: var(--primary);
      font-style: italic;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      font-size: 28px;
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-links a {
      color: var(--light-bg);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 3px;
      background: var(--light-bg);
      border-radius: 4px;
      transition: 0.3s;
    }
    @media (max-width: 768px) {
      .hamburger {
        display: flex;
      }
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        flex-direction: column;
        background: var(--secondary);
        padding: 32px 24px;
        gap: 24px;
        transform: translateY(-150%);
        opacity: 0;
        transition: 0.4s ease;
        pointer-events: none;
      }
      .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
      }
      .nav-links a {
        font-size: 18px;
      }
    }

    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 48px 0;
      }
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-dark);
    }
    .section-sub {
      color: var(--text-muted);
      margin-bottom: 40px;
      font-size: 16px;
    }
    .text-center {
      text-align: center;
    }

    /* Hero */
    .hero {
      background: var(--secondary);
      padding: 140px 0 100px;
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 800;
      color: var(--white);
      line-height: 1.3;
      margin-bottom: 24px;
      max-width: 800px;
    }
    .hero .subtitle {
      font-size: 18px;
      color: rgba(245,245,247,0.85);
      margin-bottom: 36px;
      max-width: 600px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .btn {
      display: inline-block;
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: var(--transition);
      text-align: center;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(232,56,13,0.1);
    }
    .hero-bg-graphic {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(232,56,13,0.15), transparent 50%);
      pointer-events: none;
    }
    .score-card-mock {
      margin-top: 50px;
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      border-radius: 16px;
      padding: 24px;
      display: flex;
      align-items: center;
      gap: 32px;
      color: white;
      border: 1px solid rgba(255,255,255,0.2);
    }
    .team {
      font-weight: 700;
      font-size: 20px;
    }
    .score {
      font-family: var(--font-en);
      font-size: 36px;
      font-weight: 800;
      color: var(--accent);
      font-feature-settings: "tnum";
    }
    @media (max-width: 768px) {
      .hero h1 { font-size: 28px; }
      .btn { padding: 12px 24px; width: 100%; }
      .score-card-mock { flex-direction: column; gap: 6px; }
    }

    /* 核心优势卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 20px;
    }
    .feature-card {
      background: var(--white);
      border-radius: var(--border-radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      text-align: center;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }
    .feature-icon {
      width: 64px;
      height: 64px;
      margin: 0 auto 20px;
      border-radius: 50%;
      background: rgba(232,56,13,0.08);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
      color: var(--primary);
    }
    .feature-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .features-grid { grid-template-columns: 1fr; }
    }

    /* 数据看板 */
    .data-board {
      background: var(--secondary);
      color: white;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      text-align: center;
      gap: 32px;
    }
    .stat-item .number {
      font-family: var(--font-en);
      font-size: 48px;
      font-weight: 800;
      color: var(--accent);
      font-feature-settings: "tnum";
    }
    .stat-label {
      font-size: 16px;
      opacity: 0.8;
    }
    @media (max-width: 768px) {
      .stats-grid { flex-direction: column; gap: 28px; }
      .stat-item .number { font-size: 36px; }
    }

    /* 服务图文 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-text {
      flex: 1;
    }
    .service-img {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 12px 28px rgba(0,0,0,0.1);
    }
    .service-img img {
      width: 100%;
      object-fit: cover;
    }
    @media (max-width: 768px) {
      .service-row, .service-row.reverse {
        flex-direction: column;
        gap: 24px;
      }
    }

    /* 合作伙伴 */
    .partner-wall {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 40px;
      opacity: 0.8;
    }
    .partner-wall img {
      height: 36px;
      filter: grayscale(0.2);
    }

    /* FAQ */
    .faq-item {
      background: var(--light-bg);
      border-radius: 10px;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: white;
    }
    .faq-answer p {
      padding: 18px 24px;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary);
      color: white;
    }

    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: #ccc;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer-logo {
      font-size: 22px;
      font-weight: 700;
      color: white;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }

    .counter-anim {
      transition: 0.2s;
    }