/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary-green: #0F9B4E;
      --deep-rock: #1E2A38;
      --amber-gold: #F5A623;
      --warm-white: #FAFBF7;
      --card-white: #FFFFFF;
      --light-gray-bg: #F2F4EF;
      --text-primary: #1E2A38;
      --text-secondary: #5A6874;
      --text-light: #9AA3AD;
      --border-light: #E8ECE4;
      --border-faq: #E0E4DB;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Noto Sans SC', 'Segoe UI', sans-serif;
      --font-number: 'DIN Alternate', 'Oswald', 'PingFang SC', sans-serif;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--warm-white);
      color: var(--text-primary);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 5%;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 600;
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
    }

    h2 {
      font-size: 36px;
      line-height: 1.25;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 22px;
      line-height: 1.4;
    }

    .section {
      padding: 80px 0;
    }

    @media (max-width: 1023px) {
      h1 { font-size: 40px; }
      h2 { font-size: 32px; }
      .section { padding: 70px 0; }
    }

    @media (max-width: 767px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      h3 { font-size: 20px; }
      body { font-size: 15px; }
      .section { padding: 60px 0; }
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-family: var(--font-heading);
      transition: var(--transition);
      cursor: pointer;
      border: 2px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: var(--primary-green);
      color: white;
      border-color: var(--primary-green);
    }

    .btn-primary:hover {
      background: #0B7A3D;
      border-color: #0B7A3D;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(15,155,78,0.25);
    }

    .btn-outline {
      background: transparent;
      border-color: var(--primary-green);
      color: var(--primary-green);
    }

    .btn-outline:hover {
      background: var(--primary-green);
      color: white;
    }

    .btn-gold {
      background: var(--amber-gold);
      color: var(--deep-rock);
      border-color: var(--amber-gold);
    }

    .btn-gold:hover {
      background: #F7B84E;
      border-color: #F7B84E;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(245,166,35,0.3);
    }

    @media (max-width: 767px) {
      .btn {
        width: 100%;
        min-height: 48px;
        padding: 12px 24px;
      }
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      backdrop-filter: blur(10px);
      background: rgba(255,255,255,0.75);
      transition: background 0.3s, box-shadow 0.3s;
    }

    .header.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 0;
      position: relative;
    }

    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--deep-rock);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo span {
      color: var(--primary-green);
      font-size: 1.8rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-primary);
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }

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

    .nav-cta {
      margin-left: 16px;
    }

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

    .hamburger span {
      width: 25px;
      height: 3px;
      background: var(--deep-rock);
      border-radius: 3px;
      transition: 0.3s;
    }

    @media (max-width: 1023px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: var(--deep-rock);
        flex-direction: column;
        justify-content: center;
        gap: 28px;
        padding: 40px;
        transition: right 0.3s ease;
        box-shadow: -5px 0 20px rgba(0,0,0,0.1);
      }
      .nav-links.active {
        right: 0;
      }
      .nav-links a {
        color: white;
        font-size: 1.2rem;
      }
      .nav-cta {
        margin-left: 0;
        margin-top: 20px;
      }
      .hamburger {
        display: flex;
        z-index: 1001;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, rgba(30,42,56,0.8) 0%, rgba(0,0,0,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: white;
      padding-top: 80px;
    }

    .hero-content {
      max-width: 600px;
    }

    .hero-tag {
      color: var(--amber-gold);
      letter-spacing: 2px;
      font-weight: 600;
      margin-bottom: 20px;
      text-transform: uppercase;
    }

    .hero-subtitle {
      font-size: 18px;
      opacity: 0.9;
      margin: 24px 0 32px;
      max-width: 500px;
    }

    .hero-actions {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    @media (max-width: 767px) {
      .hero {
        min-height: 70vh;
        text-align: center;
      }
      .hero-content {
        margin: 0 auto;
      }
      .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
      }
      .hero-actions {
        justify-content: center;
      }
    }

    /* 数据带 */
    .stats-band {
      background: var(--deep-rock);
      padding: 50px 0;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }
    .stat-item .stat-number {
      font-family: var(--font-number);
      font-size: 40px;
      font-weight: 700;
      color: var(--amber-gold);
    }
    .stat-label {
      color: rgba(255,255,255,0.8);
      font-size: 14px;
      margin-top: 8px;
    }

    @media (max-width: 1023px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 767px) {
      .stats-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 服务错层 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-img {
      flex: 0 0 45%;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .service-text {
      flex: 1;
    }
    .service-list {
      list-style: none;
      margin: 20px 0;
    }
    .service-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 10px;
      color: var(--text-secondary);
    }
    .service-list li::before {
      content: "✓";
      color: var(--primary-green);
      font-weight: bold;
    }

    @media (max-width: 767px) {
      .service-row, .service-row.reverse {
        flex-direction: column;
        gap: 30px;
      }
      .service-img {
        flex: 0 0 auto;
        width: 100%;
      }
    }

    /* 合作伙伴 */
    .partner-grid {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 30px;
      align-items: center;
      justify-items: center;
      margin-top: 40px;
    }
    .partner-grid img {
      filter: grayscale(1);
      opacity: 0.7;
      transition: 0.3s;
      max-width: 100px;
    }
    .partner-grid img:hover {
      filter: grayscale(0);
      opacity: 1;
    }
    @media (max-width: 1023px) {
      .partner-grid { grid-template-columns: repeat(4, 1fr); }
    }
    @media (max-width: 767px) {
      .partner-grid { grid-template-columns: repeat(3, 1fr); }
    }

    /* 安全板块 */
    .security-split {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .security-list {
      display: grid;
      gap: 28px;
    }
    .security-item {
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }
    .icon-box {
      width: 48px;
      height: 48px;
      background: var(--primary-green);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 20px;
    }
    @media (max-width: 767px) {
      .security-split {
        grid-template-columns: 1fr;
        gap: 40px;
      }
    }

    /* 见证卡片 */
    .testimonial-cards {
      display: flex;
      gap: 30px;
      align-items: flex-start;
      justify-content: center;
    }
    .testimonial {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      flex: 1;
    }
    .testimonial.featured {
      background: #F0F8F3;
      transform: translateY(-20px);
    }
    .quote-icon {
      color: var(--primary-green);
      font-size: 40px;
      opacity: 0.4;
    }
    @media (max-width: 767px) {
      .testimonial-cards {
        flex-direction: column;
      }
      .testimonial.featured {
        transform: none;
      }
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      border: 1px solid var(--border-faq);
      border-radius: 8px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px;
      background: white;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
    }
    .faq-answer {
      padding: 0 20px 20px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    @media (max-width: 767px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    /* CTA横幅 */
    .cta-banner {
      background: var(--deep-rock);
      text-align: center;
      color: white;
    }

    /* 页脚 */
    .footer {
      background: var(--deep-rock);
      color: var(--text-light);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    @media (max-width: 1023px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 767px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }