/* roulang page: index */
/* ----- 全局复位与变量 ----- */
    *,
    *::before,
    *::after {
      box-sizing: border-box;
    }
    
    :root {
      --primary: #0D9488;      /* 青碧色：运动与信任 */
      --primary-dark: #0F766E;
      --primary-light: #F0FDFA;
      --accent: #F97316;       /* 暖橙：激情与CTA */
      --accent-dark: #EA580C;
      --gray-dark: #1E293B;
      --gray-mid: #475569;
      --gray-light: #F1F5F9;
      --white: #FFFFFF;
      --bg-section: #F8FAFC;
      --border-light: #E2E8F0;
      --card-radius: 12px;
      --btn-radius: 8px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 6px 24px rgba(13,148,136,0.12);
      --transition: all 0.3s ease;
    }
    
    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      font-size: 16px;
      line-height: 1.8;
      color: var(--gray-dark);
      background-color: var(--white);
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
    }
    
     button, input {
      font-family: inherit;
    }
    
    /* 间距规范 */
    section {
      padding: 80px 0;
    }
    
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      .container {
        padding: 0 20px;
      }
    }

    /* ----- 导航 ----- */
    #header {
      position: sticky;
      top: 0;
      z-index: 50;
      background-color: var(--white);
      height: 72px;
      border-bottom: 1px solid rgba(0,0,0,0.05);
      display: flex;
      align-items: center;
      backdrop-filter: blur(8px);
      background-color: rgba(255,255,255,0.95);
    }
    
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      display: flex;
      flex-direction: column;
    }
    .logo-main {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
      line-height: 1.2;
    }
    .logo-sub {
      font-size: 0.7rem;
      color: var(--gray-mid);
      letter-spacing: 0.5px;
    }
    
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-link {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--gray-dark);
      position: relative;
      padding: 0.2rem 0;
      transition: color 0.2s;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background-color: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .btn-cta-nav {
      background: var(--accent);
      color: white;
      padding: 0.6rem 1.5rem;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: background 0.2s, box-shadow 0.2s;
      margin-left: 0.5rem;
      border: none;
      cursor: pointer;
    }
    .btn-cta-nav:hover {
      background: var(--accent-dark);
      box-shadow: 0 4px 12px rgba(249,115,22,0.3);
    }
    
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--gray-dark);
      cursor: pointer;
    }
    
    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(255,255,255,0.98);
        flex-direction: column;
        justify-content: center;
        gap: 2.5rem;
        transform: translateX(100%);
        transition: transform 0.4s ease;
        z-index: 40;
        font-size: 1.4rem;
      }
      .nav-menu.active {
        transform: translateX(0);
      }
      .hamburger {
        display: block;
        z-index: 55;
        position: relative;
      }
    }

    /* ----- Hero ----- */
    #hero {
      position: relative;
      min-height: 90vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: white;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(13,148,136,0.75);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      padding: 0 20px;
    }
    .hero-content h1 {
      font-size: 3rem;
      font-weight: 700;
      margin-bottom: 1.2rem;
      letter-spacing: 1px;
      text-shadow: 0 2px 8px rgba(0,0,0,0.2);
    }
    .hero-sub {
      font-size: 1.2rem;
      opacity: 0.95;
      margin-bottom: 2.5rem;
    }
    .hero-buttons {
      display: flex;
      gap: 1.5rem;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      transition: var(--transition);
      border: 2px solid var(--accent);
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--accent-dark);
      border-color: var(--accent-dark);
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(249,115,22,0.4);
    }
    .btn-outline {
      background: transparent;
      color: white;
      border: 2px solid white;
      padding: 14px 32px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary);
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      animation: bounce 2s infinite;
      font-size: 1.8rem;
      color: white;
    }
    @keyframes bounce {
      0%,100% { transform: translateY(0); }
      50% { transform: translateY(8px); }
    }
    @media (max-width: 768px) {
      .hero-content h1 { font-size: 2.2rem; }
    }

    /* ----- 通用卡片与板块标题 ----- */
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--gray-dark);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .card {
      background: var(--white);
      border-radius: var(--card-radius);
      padding: 30px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: center;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    /* 痛点区背景 */
    #pain-points {
      background: var(--gray-light);
    }
    /* 成果区背景 */
    #results {
      background: var(--primary-light);
    }

    /* 解决方案图文 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 60px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-text {
      flex: 1;
    }
    .solution-img {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.1rem;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--gray-mid);
    }
    
    /* 证言卡片 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
    }
    .testimonial-card {
      min-width: 320px;
      background: white;
      border-radius: var(--card-radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--primary);
    }
    
    /* 联系表单 */
    #contact {
      background: var(--primary);
      color: white;
    }
    .contact-flex {
      display: flex;
      gap: 40px;
      align-items: center;
    }
    .form-group input {
      width: 100%;
      padding: 14px;
      border-radius: var(--btn-radius);
      border: none;
      margin-bottom: 16px;
    }
    
    @media (max-width: 768px) {
      .grid-3, .contact-flex {
        grid-template-columns: 1fr;
        display: block;
      }
      .solution-row {
        flex-direction: column;
        gap: 30px;
      }
    }