/* roulang page: index */
:root {
      --primary-orange: #f15a24;
      --primary-orange-hover: #d94a1a;
      --deep-blue: #0f2b46;
      --dark-footer: #0a1e3d;
      --bg-light-gray: #f4f7fa;
      --white: #ffffff;
      --text-dark: #1e1e1e;
      --text-mid: #5f6b7a;
      --text-light: #9aa3b0;
      --accent-green: #00b894;
      --border-light: #e8ecf1;
      --shadow-card: 0 4px 20px rgba(15, 43, 70, 0.06);
      --shadow-hover: 0 8px 30px rgba(15, 43, 70, 0.10);
      --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.04);
      --radius-lg: 24px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-btn: 50px;
      --font-head: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-number: 'Inter', 'SF Pro Display', sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-head);
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-head);
      font-weight: 600;
      margin-top: 0;
    }

    a {
      color: var(--primary-orange);
      text-decoration: none;
      transition: color 0.2s;
    }

    a:hover {
      color: var(--primary-orange-hover);
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 悬浮胶囊导航 */
    .custom-nav {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 95%;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: 50px;
      padding: 8px 24px;
      box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
      z-index: 100;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: all 0.3s;
      border: 1px solid rgba(255,255,255,0.3);
    }

    .nav-logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 20px;
      color: var(--deep-blue);
      letter-spacing: 1px;
    }
    .nav-logo i {
      color: var(--primary-orange);
      font-size: 26px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 24px;
      list-style: none;
      margin: 0;
      padding: 0;
    }

    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-mid);
      transition: color 0.2s;
      white-space: nowrap;
    }

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

    .nav-cta {
      background: var(--primary-orange);
      color: white !important;
      padding: 8px 20px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      transition: all 0.25s;
      white-space: nowrap;
    }
    .nav-cta:hover {
      background: var(--primary-orange-hover);
      box-shadow: 0 4px 12px rgba(241, 90, 36, 0.3);
      transform: translateY(-1px);
      color: white !important;
    }

    .menu-icon {
      display: none;
      font-size: 24px;
      color: var(--deep-blue);
      cursor: pointer;
    }

    /* 区块间距 */
    section {
      padding: 120px 0;
    }

    .bg-light {
      background-color: var(--bg-light-gray);
    }

    .bg-dark {
      background-color: var(--deep-blue);
      color: white;
    }

    /* 首屏Hero */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: 48px;
      font-weight: 700;
      color: var(--deep-blue);
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-text .subtitle {
      font-size: 18px;
      color: var(--text-mid);
      margin-bottom: 28px;
      line-height: 1.6;
    }
    .hero-image {
      flex: 1;
      position: relative;
    }
    .hero-image img {
      border-radius: 24px;
      box-shadow: var(--shadow-card);
      width: 100%;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(241,90,36,0.12) 0%, rgba(15,43,70,0.05) 100%);
      border-radius: 24px;
      pointer-events: none;
    }
    .btn-primary {
      background: var(--primary-orange);
      color: white;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 18px;
      border: none;
      display: inline-block;
      transition: all 0.25s ease-out;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(241,90,36,0.25);
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-orange-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 22px rgba(241,90,36,0.35);
      color: white;
    }
    .trust-signals {
      display: flex;
      gap: 28px;
      margin-top: 28px;
      color: var(--text-light);
      font-size: 14px;
      flex-wrap: wrap;
    }
    .trust-signals i {
      color: var(--accent-green);
      margin-right: 4px;
    }

    /* 标题通用 */
    .section-title {
      font-size: 34px;
      font-weight: 700;
      color: var(--deep-blue);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-mid);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 60px;
    }

    /* 不对称栅格优势 */
    .advantage-grid {
      display: flex;
      gap: 30px;
      align-items: stretch;
    }
    .large-card {
      flex: 1 1 50%;
      background: white;
      border-radius: var(--radius-md);
      padding: 36px;
      box-shadow: var(--shadow-card);
      border-left: 5px solid var(--primary-orange);
      transition: all 0.25s;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .large-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .small-cards {
      flex: 1 1 50%;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .small-card {
      background: white;
      border-radius: var(--radius-sm);
      padding: 24px;
      box-shadow: var(--shadow-light);
      transition: all 0.25s;
    }
    .small-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .card-icon {
      font-size: 32px;
      color: var(--primary-orange);
      margin-bottom: 16px;
    }
    .card-link {
      font-weight: 600;
      margin-top: 16px;
      display: inline-block;
    }

    /* 解决方案步骤 */
    .steps-container {
      display: flex;
      gap: 24px;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
    }
    .step-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-light);
      flex: 1 1 250px;
      text-align: center;
      position: relative;
      transition: 0.25s;
    }
    .step-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .step-number {
      font-size: 56px;
      font-weight: 800;
      color: rgba(15, 43, 70, 0.05);
      font-family: var(--font-number);
      position: absolute;
      top: 10px;
      left: 20px;
      transition: 0.2s;
    }
    .step-card:hover .step-number {
      color: rgba(241, 90, 36, 0.08);
    }

    /* 客户证言区 */
    .case-grid {
      display: flex;
      gap: 40px;
      align-items: center;
      flex-wrap: wrap;
    }
    .logo-wall {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      flex: 1;
    }
    .logo-wall img {
      filter: grayscale(100%);
      transition: 0.3s;
      border-radius: 8px;
      background: #f0f0f0;
    }
    .logo-wall img:hover {
      filter: grayscale(0%);
    }
    .data-quote {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .big-number {
      font-size: 64px;
      font-weight: 800;
      color: var(--accent-green);
      font-family: var(--font-number);
      background: var(--bg-light-gray);
      padding: 28px 32px;
      border-radius: 16px;
      display: inline-block;
      line-height: 1;
    }
    blockquote {
      border-left: 5px solid var(--primary-orange);
      padding-left: 24px;
      font-style: italic;
      font-size: 18px;
      color: var(--text-dark);
      margin: 0;
    }

    /* FAQ */
    .accordion-title {
      background: white;
      border-bottom: 1px solid var(--border-light);
      font-size: 18px;
      font-weight: 500;
      padding: 16px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-content {
      padding: 16px 24px;
      color: var(--text-mid);
    }

    /* CTA深色区 */
    .cta-dark {
      background: var(--deep-blue);
      padding: 100px 0;
      text-align: center;
    }
    .cta-form {
      max-width: 500px;
      margin: 0 auto;
    }
    .cta-form input, .cta-form textarea {
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: var(--radius-sm);
      color: white;
      padding: 14px;
      margin-bottom: 16px;
      width: 100%;
    }
    .cta-form input::placeholder {
      color: #b0c4d8;
    }
    .contact-info {
      margin-top: 30px;
      display: flex;
      justify-content: center;
      gap: 32px;
      color: rgba(255,255,255,0.8);
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      color: var(--text-light);
    }
    .footer-grid h4 {
      color: white;
      margin-bottom: 12px;
    }
    .footer-grid a {
      color: var(--text-light);
      display: block;
      margin-bottom: 6px;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.05);
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
      color: var(--text-mid);
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .advantage-grid {
        flex-direction: column;
      }
      .case-grid {
        flex-direction: column;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 5%;
        width: 90%;
        background: white;
        flex-direction: column;
        border-radius: 24px;
        padding: 24px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.1);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-icon {
        display: block;
      }
      .hero-text h1 {
        font-size: 32px;
      }
      section {
        padding: 80px 0;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .steps-container {
        flex-direction: column;
      }
    }