/* roulang page: index */
:root {
      --primary-red: #D5001C;
      --deep-black: #1A1A1A;
      --track-gray: #F2F2F2;
      --gold-accent: #FFB81C;
      --white: #FFFFFF;
      --text-dark: #333333;
      --text-muted: #666666;
      --border-light: #e0e0e0;
      --shadow-card: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.12);
      --radius-md: 8px;
      --radius-sm: 6px;
      --font-condensed: 'Roboto Condensed', sans-serif;
      --font-main: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-main);
      font-size: 16px;
      line-height: 1.75;
      color: var(--text-dark);
      background-color: var(--white);
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航 - 分屏联动 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      z-index: 100;
      display: flex;
      align-items: center;
      box-shadow: 0 1px 8px rgba(0,0,0,0.03);
    }

    .nav-container {
      display: flex;
      width: 100%;
      height: 64px;
    }

    .brand-area {
      width: 40%;
      display: flex;
      align-items: center;
      padding-left: 20px;
      background: var(--white);
    }

    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--deep-black);
      display: flex;
      align-items: center;
      gap: 6px;
      text-decoration: none;
      letter-spacing: -0.5px;
    }
    .logo i {
      color: var(--primary-red);
      font-size: 1.8rem;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      margin-left: 2.5rem;
      list-style: none;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--text-dark);
      font-weight: 500;
      font-size: 0.95rem;
      transition: var(--transition);
      position: relative;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-red);
      transition: width 0.2s ease;
    }
    .nav-links a:hover {
      color: var(--primary-red);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .visual-side {
      width: 60%;
      background: var(--deep-black);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      display: flex;
      align-items: center;
      justify-content: flex-end;
      padding-right: 20px;
      position: relative;
    }
    .visual-side::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(26,26,26,0.7);
    }
    .header-actions {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 1.2rem;
    }
    .search-icon {
      color: white;
      font-size: 1.2rem;
      cursor: pointer;
    }
    .cta-nav {
      background: var(--primary-red);
      color: white;
      padding: 0.5rem 1.4rem;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      text-decoration: none;
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }
    .cta-nav:hover {
      background: #b00012;
      color: white;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--deep-black);
      cursor: pointer;
    }

    /* Hero 首屏 */
    .hero {
      padding-top: 64px;
      display: flex;
      min-height: 85vh;
      background: var(--white);
    }
    .hero-text {
      width: 50%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 2rem 2rem 2rem 4rem;
      background: var(--white);
    }
    .hero-text h1 {
      font-size: 3rem;
      font-weight: 700;
      color: var(--deep-black);
      line-height: 1.2;
      margin-bottom: 1.3rem;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
      max-width: 90%;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-red);
      color: white;
      padding: 0.8rem 2.2rem;
      border-radius: 30px;
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }
    .btn-primary i {
      transition: transform 0.2s;
    }
    .btn-primary:hover {
      background: #b00012;
      color: white;
    }
    .btn-primary:hover i {
      transform: translateX(4px);
    }
    .btn-outline {
      border: 1.5px solid var(--deep-black);
      background: transparent;
      color: var(--deep-black);
      padding: 0.8rem 2rem;
      border-radius: 30px;
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: #f0f0f0;
    }

    .hero-image {
      width: 50%;
      background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      position: relative;
      min-height: 400px;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, rgba(255,255,255,0.05) 0%, rgba(0,0,0,0.2) 100%);
    }

    /* 通用板块 */
    .section {
      padding: 5rem 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 0.8rem;
      color: var(--deep-black);
    }
    .section-lead {
      color: var(--text-muted);
      max-width: 700px;
      margin-bottom: 2.5rem;
    }

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

    /* 痛点区 */
    .pain-list {
      display: flex;
      gap: 2rem;
      flex-wrap: wrap;
    }
    .pain-item {
      flex: 1 1 250px;
      background: white;
      padding: 1.8rem;
      border-radius: var(--radius-md);
      border-left: 5px solid var(--primary-red);
      box-shadow: var(--shadow-card);
    }

    /* 解决方案卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 2rem;
    }
    .solution-card {
      background: white;
      padding: 2rem 1.5rem;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      position: relative;
      transition: var(--transition);
      border-left: 4px solid var(--primary-red);
    }
    .solution-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-left-width: 6px;
      border-left-color: var(--gold-accent);
    }
    .solution-card i {
      font-size: 2rem;
      color: var(--primary-red);
      margin-bottom: 1rem;
    }
    .card-link {
      color: var(--primary-red);
      font-weight: 600;
      text-decoration: none;
      margin-top: 1rem;
      display: inline-block;
    }

    /* 数据卡片 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
    }
    .stat-card {
      background: var(--deep-black);
      color: white;
      padding: 2rem 1rem;
      border-radius: var(--radius-md);
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-condensed);
      font-size: 2.8rem;
      color: var(--gold-accent);
    }

    /* 证言滚动 */
    .testimonials-scroll {
      display: flex;
      gap: 1.5rem;
      overflow-x: auto;
      padding-bottom: 1rem;
    }
    .testimonial-card {
      min-width: 300px;
      background: white;
      padding: 1.8rem;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      position: relative;
    }
    .testimonial-card::before {
      content: '“';
      font-size: 4rem;
      color: var(--primary-red);
      opacity: 0.25;
      position: absolute;
      top: 10px;
      left: 15px;
    }
    .avatar {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: #ccc;
      margin-bottom: 1rem;
    }

    /* FAQ */
    .accordion-item {
      margin-bottom: 0.8rem;
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-title {
      font-weight: 600;
      padding: 1rem 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    /* 最终CTA */
    .final-cta {
      background: var(--deep-black);
      color: white;
      text-align: center;
      padding: 4rem 2rem;
    }
    .btn-gold {
      background: var(--gold-accent);
      color: var(--deep-black);
      padding: 0.9rem 2.5rem;
      border-radius: 30px;
      font-weight: 700;
      text-decoration: none;
      display: inline-block;
      margin-top: 1.5rem;
      transition: var(--transition);
    }
    .btn-gold:hover {
      background: var(--primary-red);
      color: white;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      padding: 3rem 0;
    }

    @media (max-width: 1024px) {
      .brand-area { width: 50%; }
      .visual-side { width: 50%; }
      .hero-text { padding: 2rem; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .hero { flex-direction: column; }
      .hero-text, .hero-image { width: 100%; }
      .hero-text { padding: 2rem; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 520px) {
      .stats-grid { grid-template-columns: 1fr; }
      .hero-text h1 { font-size: 2.2rem; }
    }