/* roulang page: index */
:root {
      --primary: #1A5FCE;
      --primary-dark: #0F3B7A;
      --primary-light: #E8F0FE;
      --accent: #F4A236;
      --accent-hover: #E08E1A;
      --neutral-900: #1A202C;
      --neutral-700: #4A5568;
      --neutral-500: #718096;
      --neutral-200: #E2E8F0;
      --neutral-100: #F7F9FC;
      --neutral-50: #F4F7FB;
      --white: #FFFFFF;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
      --shadow-button: 0 4px 12px rgba(26,95,206,0.3);
      --shadow-accent: 0 6px 16px rgba(244,162,54,0.4);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-xl: 24px;
      --transition: 0.3s ease;
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-stack);
      line-height: 1.75;
      color: var(--neutral-700);
      background-color: var(--white);
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      color: var(--neutral-900);
      font-weight: 600;
      line-height: 1.3;
    }
    h1 {
      font-size: 48px;
      font-weight: 700;
      color: var(--neutral-900);
    }
    h2 {
      font-size: 36px;
      font-weight: 600;
      color: var(--primary-dark);
      margin-bottom: 48px;
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: '';
      position: absolute;
      bottom: -12px;
      left: 0;
      width: 40px;
      height: 4px;
      background-color: var(--accent);
      border-radius: 2px;
    }
    h3 {
      font-size: 24px;
      font-weight: 600;
      color: var(--neutral-900);
    }
    h4 {
      font-size: 18px;
      font-weight: 500;
      color: var(--primary);
    }
    p {
      font-size: 16px;
      color: var(--neutral-700);
      margin-bottom: 1rem;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, textarea {
      font-family: inherit;
    }
    /* 导航 */
    .nav {
      position: sticky;
      top: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(10px);
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid transparent;
      transition: box-shadow var(--transition);
    }
    .nav.scrolled {
      box-shadow: 0 1px 0 rgba(0,0,0,0.05);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo span {
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: var(--neutral-700);
      position: relative;
      padding: 4px 0;
      transition: color var(--transition);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--accent);
      color: white !important;
      padding: 10px 24px !important;
      border-radius: var(--radius-sm);
      font-weight: 500;
      transition: background var(--transition), box-shadow var(--transition);
    }
    .nav-cta:hover {
      background: var(--accent-hover);
      box-shadow: var(--shadow-accent);
    }
    .nav-cta::after {
      display: none;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--neutral-900);
      transition: var(--transition);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: white;
      z-index: 999;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-close {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 32px;
      background: none;
      border: none;
      cursor: pointer;
      color: var(--neutral-900);
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, rgba(26,95,206,0.05) 0%, rgba(232,240,254,0.4) 100%);
      position: relative;
      overflow: hidden;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 80px;
      width: 100%;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 20px;
      color: var(--neutral-500);
      margin-bottom: 40px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 500;
      font-size: 16px;
      transition: all 0.2s ease;
      cursor: pointer;
      border: 2px solid transparent;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      border-color: var(--primary-dark);
      box-shadow: var(--shadow-button);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border-color: var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary-light);
      border-color: var(--primary-dark);
      color: var(--primary-dark);
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      border-color: var(--accent);
    }
    .btn-accent:hover {
      background: var(--accent-hover);
      box-shadow: var(--shadow-accent);
    }
    .hero-image {
      flex: 1;
      position: relative;
      border-radius: var(--radius-xl);
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    }
    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,95,206,0.15) 0%, rgba(15,59,122,0.05) 100%);
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      animation: bounce 2s infinite;
      color: var(--primary);
      font-size: 24px;
    }
    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
      40% { transform: translateX(-50%) translateY(-10px); }
      60% { transform: translateX(-50%) translateY(-4px); }
    }
    /* 板块通用 */
    section {
      padding: 120px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 64px;
    }
    .section-title h2 {
      display: inline-block;
      margin-bottom: 16px;
    }
    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .pain-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .pain-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .pain-icon {
      font-size: 40px;
      color: var(--accent);
      margin-bottom: 16px;
    }
    .pain-card h3 {
      margin-bottom: 8px;
    }
    /* 解决方案 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 80px;
      margin-bottom: 80px;
    }
    .solution-row:last-child {
      margin-bottom: 0;
    }
    .solution-text {
      flex: 1;
    }
    .solution-text h3 {
      margin-bottom: 16px;
    }
    .solution-list {
      list-style: none;
      margin-top: 16px;
    }
    .solution-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 12px;
      color: var(--neutral-700);
    }
    .solution-list li::before {
      content: '✓';
      color: var(--accent);
      font-weight: bold;
    }
    .solution-image {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    }
    /* 成果数据 */
    .results-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .result-card {
      text-align: center;
      padding: 32px 16px;
      background: white;
      border-radius: var(--radius-sm);
      border-bottom: 2px solid var(--primary);
      transition: border-width var(--transition);
    }
    .result-card:hover {
      border-bottom-width: 4px;
    }
    .result-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .result-desc {
      font-size: 14px;
      color: var(--neutral-500);
    }
    /* 证言 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 16px;
      -webkit-overflow-scrolling: touch;
    }
    .testimonial-scroll::-webkit-scrollbar {
      display: none;
    }
    .testimonial-card {
      min-width: 350px;
      background: var(--neutral-100);
      border-radius: var(--radius-lg);
      padding: 40px;
      scroll-snap-align: start;
      transition: background var(--transition);
    }
    .testimonial-card:hover {
      background: var(--primary-light);
    }
    .testimonial-quote {
      font-size: 24px;
      color: var(--primary-light);
      margin-bottom: 16px;
    }
    .testimonial-text {
      font-style: italic;
      color: var(--neutral-700);
      line-height: 1.8;
      margin-bottom: 24px;
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .author-avatar {
      width: 48px;
      height: 48px;
      background: var(--neutral-200);
      border-radius: 50%;
      overflow: hidden;
    }
    .author-name {
      font-weight: 600;
      color: var(--neutral-900);
    }
    .author-role {
      font-size: 14px;
      color: var(--neutral-500);
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--neutral-200);
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-size: 18px;
      font-weight: 500;
      color: var(--neutral-900);
      transition: color var(--transition);
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-arrow {
      transition: transform var(--transition);
      font-size: 18px;
      color: var(--neutral-500);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--neutral-700);
      line-height: 1.8;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-item.active .faq-question {
      color: var(--primary);
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
      color: var(--primary);
    }
    /* CTA */
    .contact-section {
      background: var(--neutral-50);
    }
    .contact-grid {
      display: flex;
      gap: 60px;
      align-items: flex-start;
    }
    .contact-form {
      flex: 1;
      max-width: 600px;
    }
    .form-group {
      margin-bottom: 24px;
    }
    .form-input {
      width: 100%;
      height: 52px;
      border: 1px solid var(--neutral-200);
      border-radius: var(--radius-sm);
      padding: 0 16px;
      font-size: 16px;
      transition: all var(--transition);
      background: white;
    }
    .form-input:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(26,95,206,0.1);
    }
    textarea.form-input {
      height: 120px;
      padding: 16px;
      resize: vertical;
    }
    .contact-info {
      flex: 0 0 280px;
    }
    .info-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 20px;
      font-size: 16px;
      color: var(--neutral-700);
    }
    /* 页脚 */
    .footer {
      background: var(--neutral-900);
      color: #CBD5E0;
      padding: 60px 0 0;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer h4 {
      color: white;
      margin-bottom: 20px;
      font-weight: 600;
    }
    .footer a {
      color: #CBD5E0;
      display: block;
      margin-bottom: 12px;
      transition: color var(--transition);
    }
    .footer a:hover {
      color: var(--accent);
    }
    .footer-bottom {
      border-top: 1px solid #2D3748;
      margin-top: 40px;
      padding: 24px 0;
      font-size: 14px;
      color: var(--neutral-500);
      text-align: center;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .hero .container {
        flex-direction: column;
        gap: 40px;
      }
      .hero-text h1 {
        font-size: 40px;
      }
      .solution-row {
        flex-direction: column;
        gap: 40px;
      }
      .results-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .nav {
        height: 60px;
      }
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 28px;
      }
      h3 {
        font-size: 20px;
      }
      section {
        padding: 80px 0;
      }
      .pain-grid {
        grid-template-columns: 1fr;
      }
      .contact-grid {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .hero-buttons .btn {
        width: 100%;
      }
      .testimonial-card {
        min-width: 85vw;
      }
    }
    @media (max-width: 520px) {
      .results-grid {
        grid-template-columns: 1fr;
      }
    }