/* roulang page: index */
:root {
      --primary: #E63946;
      --primary-dark: #C1121F;
      --secondary: #1D3557;
      --bg-light: #F8F9FA;
      --accent: #F4A261;
      --success: #2A9D8F;
      --text-main: #1D3557;
      --text-muted: #6C757D;
      --white: #ffffff;
      --border-light: #e9ecef;
      --shadow-card: 0 8px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 14px 28px rgba(0,0,0,0.10);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --transition: all 0.25s ease;
      --font-sans: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 0.75rem;
    }
    h2 {
      font-size: 2.25rem;
      color: var(--secondary);
      margin-bottom: 1rem;
    }
    h3 {
      font-size: 1.5rem;
      color: var(--secondary);
    }
    p {
      color: var(--text-muted);
      margin-bottom: 1.2rem;
    }
    a {
      color: var(--primary);
      transition: var(--transition);
      text-decoration: none;
    }
    a:hover {
      color: var(--primary-dark);
    }
    .btn {
      display: inline-block;
      font-weight: 600;
      border-radius: 30px;
      padding: 12px 32px;
      transition: var(--transition);
      text-align: center;
      cursor: pointer;
      border: 2px solid transparent;
      font-size: 1rem;
      letter-spacing: 0.3px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
      box-shadow: 0 8px 16px rgba(230,57,70,0.25);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      border-color: var(--primary-dark);
      color: white;
      transform: scale(1.02);
      box-shadow: 0 12px 22px rgba(193,18,31,0.3);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .btn-white {
      background: white;
      color: var(--primary);
      border-color: white;
    }
    .btn-white:hover {
      background: #f1f1f1;
      border-color: #f1f1f1;
      color: var(--primary-dark);
    }
    /* 导航栏 */
    .brand-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 40;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 16px rgba(0,0,0,0.04);
      transition: background 0.3s, box-shadow 0.3s;
      padding: 12px 0;
    }
    .brand-nav.scrolled {
      background: rgba(29,53,87,0.92);
      backdrop-filter: blur(16px);
      box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .logo span {
      color: var(--secondary);
    }
    .scrolled .logo {
      color: white;
    }
    .scrolled .logo span {
      color: #f1f1f1;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      color: var(--secondary);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
    }
    .scrolled .nav-links a {
      color: rgba(255,255,255,0.9);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .badge-hot {
      background: var(--accent);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 600;
      margin-left: 6px;
      background: #F4A261;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--secondary);
      cursor: pointer;
    }
    .scrolled .menu-toggle {
      color: white;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(29,53,87,0.96);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 1.5rem;
        border-radius: 0 0 20px 20px;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        color: white !important;
        font-size: 1.1rem;
      }
      .menu-toggle {
        display: block;
      }
      .badge-hot {
        margin-left: 0;
      }
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, rgba(29,53,87,0.75) 0%, rgba(230,57,70,0.65) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
      margin-top: 0;
      padding-top: 80px;
    }
    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 3rem;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-size: 3.4rem;
      font-weight: 700;
      color: white;
      line-height: 1.2;
      margin-bottom: 1.2rem;
      text-shadow: 0 4px 12px rgba(0,0,0,0.3);
    }
    .hero .sub {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.9);
      margin-bottom: 2rem;
    }
    .floating-badge {
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(12px);
      border-radius: 20px;
      padding: 16px 24px;
      color: white;
      display: inline-flex;
      align-items: center;
      gap: 12px;
      font-weight: 600;
      margin-top: 1rem;
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2.5rem;
      }
      .hero {
        min-height: 70vh;
      }
    }
    /* 板块通用 */
    .section {
      padding: 90px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }
    .section-title h2 {
      font-size: 2.5rem;
      font-weight: 700;
    }
    .divider {
      width: 60px;
      height: 4px;
      background: var(--primary);
      margin: 1rem auto 1.5rem;
      border-radius: 4px;
    }
    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 2rem;
      margin-top: 2rem;
    }
    .pain-item {
      background: white;
      padding: 2rem 1.5rem;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: var(--transition);
    }
    .pain-item i {
      font-size: 2.5rem;
      color: var(--primary);
      margin-bottom: 1rem;
    }
    /* 解决方案卡片 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 2rem;
    }
    .solution-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border-top: 5px solid var(--primary);
    }
    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .solution-card img {
      width: 60px;
      height: 60px;
      object-fit: cover;
      border-radius: 12px;
      margin-bottom: 1.2rem;
    }
    /* 成果数字 */
    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      gap: 2rem;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--success);
    }
    /* 证言 */
    .testimonial-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      border-left: 5px solid var(--primary);
      display: flex;
      gap: 1rem;
      align-items: center;
      margin-bottom: 1.5rem;
    }
    .testimonial-card img {
      width: 65px;
      height: 65px;
      border-radius: 50%;
      object-fit: cover;
    }
    /* FAQ */
    .accordion-title {
      font-weight: 600;
      font-size: 1.2rem;
    }
    /* 最终CTA */
    .cta-section {
      background: linear-gradient(120deg, var(--secondary) 0%, #14253d 100%);
      color: white;
      text-align: center;
      padding: 100px 0;
    }
    .footer {
      background: #0f1a2f;
      color: #ccc;
      padding: 3rem 0 1.5rem;
    }
    .footer a {
      color: #aaa;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(160px,1fr));
      gap: 2rem;
    }