/* roulang page: index */
:root {
      --primary: #2C3E38;
      --primary-deep: #1E2B27;
      --accent: #E67E22;
      --accent-hover: #D35400;
      --bg-page: #F8F9FA;
      --bg-card: #FFFFFF;
      --text-primary: #212529;
      --text-secondary: #495057;
      --text-muted: #6C757D;
      --border: #E9ECEF;
      --radius-sm: 6px;
      --radius: 8px;
      --radius-pill: 24px;
      --shadow-card: 0 2px 8px rgba(0,0,0,0.04), 0 4px 16px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "Roboto", sans-serif;
      --max-width: 1200px;
      --nav-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg-page);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input {
      font-family: inherit;
      outline: none;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
      border-bottom: 1px solid var(--border);
      transition: box-shadow 0.3s;
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: var(--nav-height);
      gap: 24px;
    }
    .logo {
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary);
      white-space: nowrap;
      letter-spacing: 0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-size: 0.95rem;
      color: var(--text-secondary);
    }
    .nav-links a {
      transition: color 0.2s;
      font-weight: 500;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .search-box {
      display: flex;
      align-items: center;
      background: #F1F3F5;
      border-radius: var(--radius-pill);
      padding: 0 18px;
      height: 44px;
      min-width: 240px;
      border: 1px solid transparent;
      transition: all 0.2s;
    }
    .search-box:focus-within {
      border-color: var(--primary);
      background: #fff;
      box-shadow: 0 0 0 3px rgba(44,62,56,0.1);
    }
    .search-box input {
      border: none;
      background: transparent;
      width: 100%;
      font-size: 0.9rem;
      color: var(--text-primary);
    }
    .search-box input::placeholder {
      color: #ADB5BD;
    }
    .search-icon {
      color: #6C757D;
      margin-right: 8px;
      font-size: 1rem;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary);
      cursor: pointer;
    }
    @media (max-width: 992px) {
      .nav-links {
        display: none;
      }
      .search-box {
        min-width: 180px;
      }
      .hamburger {
        display: block;
      }
    }
    @media (max-width: 768px) {
      .search-box {
        min-width: 140px;
      }
      .logo {
        font-size: 1.2rem;
      }
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, rgba(44,62,56,0.85) 0%, rgba(44,62,56,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 75vh;
      display: flex;
      align-items: center;
      color: #fff;
      position: relative;
      overflow: hidden;
    }
    .hero::after {
      content: '';
      position: absolute;
      right: 5%;
      top: 10%;
      width: 4px;
      height: 60%;
      background: linear-gradient(to bottom, transparent, var(--accent), transparent);
      opacity: 0.5;
      transform: rotate(5deg);
    }
    .hero-content {
      max-width: 700px;
    }
    .hero h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 20px;
      letter-spacing: 1px;
    }
    .hero p {
      font-size: 1.25rem;
      margin-bottom: 32px;
      opacity: 0.9;
      line-height: 1.6;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-block;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 1rem;
      transition: all 0.2s;
      cursor: pointer;
      text-align: center;
    }
    .btn-primary {
      background: var(--accent);
      color: #fff;
      border: none;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(230,126,34,0.25);
    }
    .btn-outline {
      border: 2px solid #fff;
      color: #fff;
      background: transparent;
    }
    .btn-outline:hover {
      background: #fff;
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .hero {
        min-height: 65vh;
      }
      .hero h1 {
        font-size: 2.2rem;
      }
      .hero p {
        font-size: 1rem;
      }
    }
    /* 通用区块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      text-align: center;
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto 48px;
      font-size: 1.05rem;
    }
    /* 痛点卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .pain-card {
      background: var(--bg-card);
      border-radius: var(--radius);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      border-left: 5px solid #D32F2F;
    }
    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .pain-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
      color: #C62828;
    }
    /* 解决方案区 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
      flex-wrap: wrap;
    }
    .solution-img {
      flex: 1 1 300px;
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .solution-text {
      flex: 1 1 300px;
    }
    .solution-text h2 {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 18px;
    }
    /* 优势卡片 */
    .advantage-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--bg-card);
      border-radius: var(--radius);
      padding: 28px 20px;
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: 0.3s;
      border-bottom: 4px solid var(--accent);
    }
    .adv-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .adv-icon {
      font-size: 2.4rem;
      color: var(--accent);
      margin-bottom: 16px;
    }
    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      position: relative;
      text-align: center;
    }
    .step {
      flex:1;
      padding: 0 15px;
    }
    .step-num {
      background: var(--accent);
      color: #fff;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.5rem;
      margin: 0 auto 16px;
    }
    /* 数据卡片 */
    .stats {
      display: flex;
      justify-content: space-around;
      background: var(--primary);
      color: #fff;
      border-radius: var(--radius);
      padding: 40px 20px;
      flex-wrap: wrap;
    }
    .stat-item h3 {
      font-size: 2.6rem;
      font-weight: 700;
      color: var(--accent);
      font-family: var(--font-number);
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .test-card {
      background: var(--bg-card);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-card);
    }
    .test-card q {
      font-style: italic;
      color: var(--text-secondary);
      display: block;
      margin-bottom: 16px;
    }
    /* FAQ */
    .faq-item {
      background: var(--bg-card);
      border-radius: var(--radius);
      margin-bottom: 12px;
      box-shadow: var(--shadow-card);
      padding: 0 20px;
    }
    .faq-question {
      font-weight: 600;
      padding: 18px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }
    /* CTA */
    .cta-block {
      background: var(--primary-deep);
      color: #fff;
      text-align: center;
      border-radius: var(--radius);
      padding: 60px 24px;
    }
    /* 页脚 */
    .footer {
      background: var(--primary-deep);
      color: #ccc;
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 32px;
    }
    .footer a {
      color: #ccc;
      transition: color 0.2s;
    }
    .footer a:hover {
      color: var(--accent);
    }
    @media (max-width: 992px) {
      .grid-3, .testimonial-grid { grid-template-columns: repeat(2,1fr); }
      .advantage-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .grid-3, .testimonial-grid, .advantage-grid, .footer-grid { grid-template-columns: 1fr; }
      .steps { flex-direction: column; gap: 24px; }
      .hero h1 { font-size: 2rem; }
      section { padding: 60px 0; }
      .section-title { font-size: 1.8rem; }
    }