/* roulang page: index */
:root {
      --primary: #FF6B35;
      --primary-dark: #E55A2B;
      --secondary: #2E8B57;
      --bg-light: #FAFAFA;
      --bg-white: #FFFFFF;
      --bg-dark: #1E2A2F;
      --text-heading: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #8C8C8C;
      --text-light: #F5F5F5;
      --border-color: #E8ECF0;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.08);
      --shadow-nav: 0 1px 8px rgba(0,0,0,0.06);
      --shadow-button: 0 4px 14px rgba(255,107,53,0.30);
      --radius-card: 12px;
      --radius-button: 8px;
      --radius-img: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-num: "Inter", "SF Pro Display", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.6;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3 {
      color: var(--text-heading);
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--bg-white);
      z-index: 1000;
      border-bottom: 1px solid var(--border-color);
      transition: box-shadow 0.2s ease;
      height: 70px;
      display: flex;
      align-items: center;
    }
    .header-shadow {
      box-shadow: var(--shadow-nav);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--text-heading);
    }
    .logo-dot {
      width: 12px;
      height: 12px;
      background: var(--primary);
      border-radius: 50%;
      margin-right: 10px;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .btn-primary-nav {
      background: var(--primary);
      color: white !important;
      padding: 10px 24px;
      border-radius: var(--radius-button);
      font-weight: 600;
      box-shadow: var(--shadow-button);
      transition: 0.2s;
    }
    .btn-primary-nav:hover {
      background: var(--primary-dark);
      box-shadow: 0 6px 20px rgba(255,107,53,0.4);
      color: white;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--text-heading);
      cursor: pointer;
    }
    @media(max-width:768px){
      .nav-links {
        display: none;
        position: absolute;
        top:70px;
        left:0;
        width:100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap:20px;
        border-bottom:1px solid var(--border-color);
        box-shadow: var(--shadow-card);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
    }
    /* 通用板块间距 */
    section {
      padding: 100px 0;
    }
    @media(max-width:768px){
      section {
        padding: 70px 0;
      }
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #F8F9FA 0%, #FFFFFF 100%);
      margin-top: 70px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-left h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      color: var(--text-heading);
      margin-bottom: 20px;
    }
    .hero-left .sub {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      box-shadow: var(--shadow-button);
      cursor: pointer;
      transition: 0.2s;
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 8px 22px rgba(255,107,53,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 30px;
      border-radius: var(--radius-button);
      font-weight: 600;
      cursor: pointer;
      transition: 0.2s;
      font-size: 1rem;
    }
    .btn-outline:hover {
      background: rgba(255,107,53,0.05);
    }
    .hero-stats {
      display: flex;
      gap: 32px;
      flex-wrap: wrap;
      color: var(--text-muted);
    }
    .hero-stats span strong {
      font-family: var(--font-num);
      font-weight: 700;
      color: var(--primary);
      font-size: 1.6rem;
    }
    .hero-right img {
      border-radius: var(--radius-img);
      box-shadow: var(--shadow-card);
      width: 100%;
    }
    @media(max-width:768px){
      .hero-grid {
        flex-direction: column;
      }
      .hero-left h1 {
        font-size: 32px;
      }
    }
    /* Features 图文交错 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .feature-row.reverse {
      flex-direction: row-reverse;
    }
    .feature-text, .feature-img {
      flex: 1;
    }
    .feature-icon {
      width: 48px;
      height: 48px;
      background: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.4rem;
      margin-bottom: 16px;
    }
    .feature-text h3 {
      font-size: 26px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .feature-text p {
      color: var(--text-body);
      margin-bottom: 16px;
    }
    .text-link {
      color: var(--primary);
      font-weight: 600;
      transition: 0.2s;
    }
    .text-link:hover {
      color: var(--secondary);
      text-decoration: underline;
    }
    .feature-img img {
      border-radius: var(--radius-img);
      box-shadow: var(--shadow-card);
      width: 100%;
    }
    @media(max-width:768px){
      .feature-row, .feature-row.reverse {
        flex-direction: column;
      }
    }
    /* 场景横向滚动 */
    .scenarios-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
      scrollbar-color: var(--primary) #eee;
    }
    .scenarios-scroll::-webkit-scrollbar {
      height: 6px;
    }
    .scenario-card {
      min-width: 280px;
      background: var(--bg-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: 0.2s;
    }
    .scenario-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    .scenario-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .scenario-card:hover img {
      transform: scale(1.03);
    }
    .scenario-info {
      padding: 20px;
    }
    .scenario-info h3 {
      margin-bottom: 8px;
    }
    @media(max-width:768px){
      .scenario-card {
        min-width: 260px;
      }
    }
    /* 数据墙 */
    .data-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 32px;
      margin-bottom: 48px;
      text-align: center;
    }
    .data-item .big-num {
      font-family: var(--font-num);
      font-size: 56px;
      font-weight: 800;
      color: var(--primary);
    }
    .logo-wall {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 32px;
      filter: grayscale(100%);
      opacity: 0.7;
      transition: 0.2s;
    }
    .logo-wall img {
      height: 40px;
      transition: 0.2s;
    }
    .logo-wall img:hover {
      filter: grayscale(0%);
      opacity: 1;
    }
    /* 价格 */
    .pricing-grid {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .plan-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      flex: 1 1 250px;
      box-shadow: var(--shadow-card);
      border: 2px solid transparent;
      transition: 0.2s;
      position: relative;
    }
    .plan-card.recommended {
      border-color: var(--primary);
      box-shadow: 0 12px 28px rgba(0,0,0,0.06);
      transform: translateY(-4px);
    }
    .plan-price {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary);
    }
    .plan-features {
      list-style: none;
      margin: 20px 0;
    }
    .plan-features li {
      margin-bottom: 8px;
    }
    .plan-features i {
      color: var(--secondary);
      margin-right: 8px;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-color);
      padding: 16px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 600;
      color: var(--text-heading);
    }
    .faq-q-badge {
      width: 28px;
      height: 28px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      padding-left: 40px;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 120px;
      padding-top: 8px;
    }
    /* CTA */
    .cta-banner {
      background: var(--primary);
      position: relative;
      overflow: hidden;
    }
    .cta-banner::before {
      content: "";
      position: absolute;
      inset:0;
      background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.1) 0%, transparent 60%);
    }
    .cta-content {
      position: relative;
      text-align: center;
      color: white;
    }
    .cta-content h2 {
      color: white;
      font-size: 2.5rem;
    }
    .btn-white {
      background: white;
      color: var(--primary);
      border: none;
      padding: 14px 40px;
      border-radius: var(--radius-button);
      font-weight: 700;
      margin-top: 24px;
      display: inline-block;
    }
    /* Footer */
    .site-footer {
      background: var(--bg-dark);
      color: #B0B8BD;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 40px;
      justify-content: space-between;
    }
    .footer-col p {
      margin-top: 12px;
    }
    .social-icons i {
      font-size: 1.5rem;
      margin-right: 16px;
      color: #B0B8BD;
      transition: 0.2s;
    }
    .social-icons i:hover {
      color: var(--primary);
    }
    .copyright {
      margin-top: 40px;
      text-align: center;
      font-size: 0.9rem;
    }