/* roulang page: index */
:root {
      --primary: #E31E24;
      --primary-hover: #C41A20;
      --secondary: #1A1A1A;
      --bg: #FAFAF7;
      --card-bg: #FFFFFF;
      --accent: #C8963E;
      --text-main: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #8A8A8A;
      --border-light: #E8E8E2;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.10);
      --radius-card: 12px;
      --radius-btn: 6px;
      --font-title: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "DIN Alternate", "PingFang SC", sans-serif;
      --container-max: 1200px;
      --section-gap: 100px;
      --card-gap: 24px;
      --transition: 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }
    body {
      font-family: var(--font-body);
      font-weight: 400;
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-body);
      background-color: var(--bg);
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-title);
      color: var(--text-main);
      font-weight: 700;
    }
    h2 {
      font-size: 2.2rem;
      letter-spacing: -0.01em;
      margin-bottom: 16px;
      line-height: 1.3;
    }
    h3 {
      font-size: 1.4rem;
      font-weight: 600;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-title);
      font-weight: 600;
      transition: var(--transition);
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-size: 1rem;
      line-height: 1.2;
      background: transparent;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 12px rgba(227,30,36,0.25);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: scale(1.02);
      box-shadow: 0 6px 18px rgba(196,26,32,0.35);
    }
    .btn-outline {
      border: 1.5px solid var(--secondary);
      color: var(--secondary);
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--secondary);
      color: #fff;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 10px rgba(0,0,0,0.04);
      z-index: 1000;
      transition: var(--transition);
      padding: 12px 0;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 1.7rem;
      color: var(--primary);
      letter-spacing: -0.02em;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .logo span {
      color: var(--secondary);
      font-weight: 700;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
      font-weight: 500;
      color: var(--text-main);
    }
    .nav-links a {
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--secondary);
      padding: 4px;
    }
    /* Hero */
    .hero {
      padding: 140px 0 80px;
      display: flex;
      align-items: center;
      gap: 60px;
      background: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.7) 0%, var(--bg) 90%);
      position: relative;
    }
    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: repeating-linear-gradient(45deg, rgba(0,0,0,0.02) 0px, rgba(0,0,0,0.02) 1px, transparent 1px, transparent 10px);
      pointer-events: none;
    }
    .hero-content {
      flex: 1;
      position: relative;
      z-index: 2;
    }
    .hero h1 {
      font-size: clamp(2.4rem, 5vw, 3.75rem);
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: -0.02em;
    }
    .hero .subtitle {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-image {
      flex: 1;
      position: relative;
      background: #f0f0ea;
      border-radius: 28px;
      overflow: hidden;
      box-shadow: var(--shadow-md);
      aspect-ratio: 4/3;
    }
    .hero-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      filter: saturate(0.9) contrast(1.1);
    }
    /* 通用板块 */
    .section {
      padding: var(--section-gap) 0;
    }
    .section-header {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 56px;
    }
    .section-header p {
      color: var(--text-muted);
      font-size: 1.1rem;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--card-gap);
    }
    .grid-2-1 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: var(--card-gap);
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    /* 痛点卡片 */
    .pain-card {
      border-left: 5px solid var(--primary);
      padding-left: 24px;
    }
    .pain-card h3 {
      margin-bottom: 12px;
    }
    /* 方案卡片 */
    .service-card {
      text-align: center;
      padding: 36px 24px;
    }
    .service-icon {
      width: 64px;
      height: 64px;
      background: #fff9f0;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      color: var(--accent);
      font-size: 2rem;
      border: 1px solid var(--border-light);
    }
    .link-arrow {
      color: var(--primary);
      font-weight: 600;
      margin-top: 16px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .link-arrow i {
      transition: transform 0.2s;
    }
    .link-arrow:hover i {
      transform: translateX(4px);
    }
    /* 数据区 */
    .data-highlight {
      display: flex;
      align-items: center;
      gap: 50px;
      background: #fff;
      border-radius: var(--radius-card);
      padding: 48px;
      box-shadow: var(--shadow-sm);
      flex-wrap: wrap;
    }
    .big-number {
      font-family: var(--font-number);
      font-size: 5rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1;
    }
    .small-data-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      flex: 1;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent);
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .testimonial-card {
      background: #fff;
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .testimonial-card.center-card {
      transform: translateY(-10px);
      box-shadow: var(--shadow-md);
    }
    .testimonial-avatar {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      background: #eee;
      margin-bottom: 18px;
      overflow: hidden;
    }
    .quote {
      font-style: italic;
      color: var(--text-main);
      margin-bottom: 16px;
      font-size: 0.98rem;
    }
    .author {
      font-weight: 700;
      color: var(--secondary);
    }
    .position {
      color: var(--text-muted);
      font-size: 0.85rem;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
      background: #F5F5F2;
      border-radius: 20px;
      padding: 20px;
    }
    .faq-item {
      background: #fff;
      border-radius: 12px;
      margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      color: var(--secondary);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }
    .faq-toggle {
      font-size: 1.5rem;
      color: var(--primary);
      transition: transform 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 24px;
      transition: max-height 0.3s ease, padding 0.3s;
      color: var(--text-body);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px;
    }
    .faq-item.open .faq-toggle {
      transform: rotate(45deg);
    }
    /* 最终CTA */
    .cta-dark {
      background: var(--secondary);
      color: white;
      border-radius: 24px;
      padding: 64px 48px;
      text-align: center;
    }
    .cta-dark h2 {
      color: white;
    }
    .form-inline {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 32px;
    }
    .form-inline input {
      padding: 14px 18px;
      border-radius: var(--radius-btn);
      border: 1px solid #ccc;
      background: white;
      min-width: 200px;
      font-family: var(--font-body);
    }
    .form-inline input:focus {
      outline: none;
      border-color: var(--primary);
    }
    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: #ddd;
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 24px;
    }
    .footer-logo {
      font-size: 1.6rem;
      font-weight: 800;
      color: white;
    }
    .footer-contact {
      font-size: 1.2rem;
    }
    .copyright {
      text-align: center;
      padding-top: 32px;
      color: #aaa;
      font-size: 0.85rem;
      border-top: 1px solid #333;
      margin-top: 32px;
    }
    @media (max-width: 1024px) {
      .grid-3, .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero {
        flex-direction: column;
        gap: 40px;
      }
      .data-highlight {
        flex-direction: column;
        text-align: center;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        right: 20px;
        background: white;
        flex-direction: column;
        width: 220px;
        padding: 24px;
        box-shadow: var(--shadow-md);
        border-radius: 12px;
        gap: 18px;
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
      .grid-3, .testimonial-grid, .grid-2-1 {
        grid-template-columns: 1fr;
      }
      .testimonial-card.center-card {
        transform: none;
      }
      .big-number {
        font-size: 3.5rem;
      }
      .section {
        padding: 60px 0;
      }
    }