/* roulang page: index */
:root {
      --primary: #E63946;
      --primary-dark: #C62838;
      --secondary: #1D1D1D;
      --gray-bg: #F2F2F2;
      --gold: #F4A261;
      --success: #2A9D8F;
      --white: #FFFFFF;
      --text-dark: #1D1D1D;
      --text-muted: #4A4A4A;
      --border-light: #E5E5E5;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --transition: all 0.25s ease;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Roboto', system-ui, -apple-system, sans-serif;
      --max-width: 1200px;
    }

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

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

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

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      background: none;
    }

    h2 {
      font-size: clamp(28px, 5vw, 40px);
      font-weight: 700;
      letter-spacing: -0.3px;
      margin-bottom: 12px;
      position: relative;
      display: inline-block;
    }

    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -6px;
      width: 60%;
      height: 4px;
      background: var(--primary);
      border-radius: 2px;
    }

    .section-title-center h2::after {
      left: 20%;
      width: 60%;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    /* 导航 */
    #nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      box-shadow: 0 1px 8px rgba(0,0,0,0.05);
      z-index: 99;
      height: 72px;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .brand {
      font-size: 26px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .brand-icon {
      width: 28px;
      height: 28px;
      background: var(--primary);
      border-radius: 6px;
      position: relative;
      transform: rotate(45deg);
    }
    .brand-icon::after {
      content: '';
      position: absolute;
      left: 4px;
      top: 4px;
      width: 6px;
      height: 6px;
      background: white;
      border-radius: 2px;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-dark);
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding: 8px 0;
      transition: var(--transition);
    }
    .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 {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary-nav {
      background: var(--primary);
      color: white;
      padding: 12px 24px;
      border-radius: 100px;
      font-weight: 600;
      margin-left: 16px;
      white-space: nowrap;
    }
    .btn-primary-nav:hover {
      background: #C62838;
      transform: scale(1.02);
      box-shadow: 0 4px 12px rgba(230,57,70,0.3);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
    }
    .hamburger span {
      width: 26px;
      height: 3px;
      background: var(--text-dark);
      border-radius: 4px;
      transition: var(--transition);
    }

    /* Hero */
    #hero {
      min-height: 100vh;
      background: linear-gradient(135deg, rgba(29,29,29,0.82) 0%, rgba(230,57,70,0.7) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: white;
      margin-top: 0;
      position: relative;
    }
    .hero-content {
      max-width: 700px;
      padding: 100px 0 80px;
    }
    .hero-content h1 {
      font-size: clamp(36px, 7vw, 64px);
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }
    .hero-highlight {
      color: var(--gold);
    }
    .hero-sub {
      font-size: clamp(16px, 2.5vw, 22px);
      opacity: 0.9;
      margin-bottom: 36px;
      max-width: 550px;
    }
    .btn-gradient {
      background: linear-gradient(135deg, var(--primary), #F77F00);
      color: white;
      padding: 18px 40px;
      font-weight: 700;
      font-size: 18px;
      border-radius: var(--radius-btn);
      box-shadow: 0 8px 24px rgba(230,57,70,0.4);
    }
    .btn-gradient:hover {
      transform: scale(1.04);
      background: linear-gradient(135deg, #C62838, #E06B00);
      box-shadow: 0 12px 28px rgba(230,57,70,0.5);
    }

    /* 通用区块 */
    section {
      padding: 90px 0;
    }
    .section-header {
      margin-bottom: 56px;
    }
    .text-center {
      text-align: center;
    }

    /* 痛点 */
    .pain-grid {
      display: flex;
      flex-direction: column;
      gap: 64px;
    }
    .pain-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: center;
      gap: 48px;
    }
    .pain-img {
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      object-fit: cover;
      aspect-ratio: 4/3;
      width: 100%;
    }
    .pain-text h3 {
      color: var(--primary);
      margin-bottom: 12px;
    }
    .bg-gray {
      background: var(--gray-bg);
    }

    /* 方案卡片 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .solution-card {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 36px 28px;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }
    .card-icon {
      width: 64px;
      height: 64px;
      background: rgba(230,57,70,0.08);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 25px;
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 22px;
      border-radius: 100px;
      font-weight: 600;
      background: transparent;
      margin-top: 20px;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }

    /* 成果 */
    .dark-bg {
      background: var(--secondary);
      color: white;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      text-align: center;
    }
    .stat-number {
      font-size: 62px;
      font-weight: 900;
      color: var(--gold);
      line-height: 1.1;
    }

    /* 证言 */
    .testi-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .testimonial-card {
      background: var(--gray-bg);
      padding: 32px;
      border-radius: var(--radius-card);
      border-left: 6px solid var(--primary);
    }
    .stars {
      color: var(--gold);
      font-size: 18px;
      margin: 8px 0 12px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-btn {
      width: 100%;
      text-align: left;
      padding: 22px 8px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      background: transparent;
    }
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
      padding: 0 8px;
    }
    .faq-item.active .faq-content {
      max-height: 180px;
      padding-bottom: 20px;
    }

    /* CTA */
    .cta-banner {
      background: linear-gradient(135deg, #1D1D1D 0%, #2B1A1A 100%);
      clip-path: polygon(0 9%, 100% 0, 100% 100%, 0 91%);
      padding: 110px 0;
      text-align: center;
      color: white;
    }
    .btn-huge {
      background: linear-gradient(to right, #E63946, #F77F00);
      color: white;
      padding: 20px 48px;
      font-size: 22px;
      font-weight: 700;
      border-radius: 60px;
    }

    footer {
      background: #111;
      color: #ccc;
      padding: 64px 0 32px;
    }

    @media (max-width: 1024px) {
      .solutions-grid, .stats-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .pain-row, .testi-grid { grid-template-columns: 1fr; }
      .solutions-grid, .stats-grid { grid-template-columns: 1fr; }
      #hero { text-align: center; }
      .hero-content { margin: 0 auto; }
      h2::after { left: 0; width: 50%; }
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以下代码修复上文truncation：
      .section-title-center h2::after { left: 25%; }
    }