/* roulang page: index */
:root {
      --deep-space: #0A0820;
      --space-blue: #0F0D2A;
      --card-bg: rgba(20, 16, 60, 0.55);
      --primary-purple: #6C3CE1;
      --star-gold: #F0C850;
      --text-light: #C8C4E0;
      --text-dim: #8A85B0;
      --white: #FFFFFF;
      --border-glow: rgba(108, 60, 225, 0.25);
      --glass-border: rgba(255, 255, 255, 0.08);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-container: 20px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 1px rgba(108, 60, 225, 0.3);
      --shadow-glow: 0 0 20px rgba(108, 60, 225, 0.5);
      --font-heading: 'Poppins', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition-smooth: 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--deep-space);
      color: var(--text-light);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    section {
      padding: 110px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
      .container {
        padding: 0 20px;
      }
    }

    /* 导航栏 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(10, 8, 32, 0.75);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(108, 60, 225, 0.15);
      padding: 16px 0;
      transition: var(--transition-smooth);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }
    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--white);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo span {
      background: linear-gradient(135deg, #F0C850, #E0A800);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      color: var(--text-light);
      font-weight: 500;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a:hover {
      color: var(--star-gold);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--star-gold);
      transition: 0.2s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-nav {
      background: linear-gradient(135deg, #F0C850, #E0A800);
      color: #1A1040;
      font-weight: 700;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      box-shadow: 0 0 16px rgba(240, 200, 80, 0.5);
      letter-spacing: 0.5px;
      transition: var(--transition-smooth);
      margin-left: 16px;
      white-space: nowrap;
    }
    .btn-nav:hover {
      box-shadow: 0 0 28px rgba(240, 200, 80, 0.8);
      transform: scale(1.03);
    }
    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .menu-toggle span {
      width: 26px;
      height: 2px;
      background: var(--white);
      transition: 0.3s;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        background: rgba(10, 8, 32, 0.95);
        backdrop-filter: blur(20px);
        padding: 24px;
        margin-top: 16px;
        border-radius: 20px;
        gap: 20px;
        align-items: flex-start;
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: flex;
      }
      .btn-nav {
        margin-left: 0;
        width: 100%;
        text-align: center;
      }
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: linear-gradient(180deg, #0A0820 0%, #1A1040 100%);
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(108,60,225,0.25) 0%, transparent 70%);
      top: 10%;
      right: 5%;
      border-radius: 50%;
      filter: blur(40px);
    }
    .hero-container {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }
    .hero-content {
      flex: 0 0 55%;
    }
    .hero-content h1 {
      font-family: var(--font-heading);
      font-size: clamp(2.8rem, 5vw, 4rem);
      font-weight: 800;
      line-height: 1.2;
      color: var(--white);
      margin-bottom: 1.5rem;
    }
    .hero-content h1 .highlight {
      background: linear-gradient(135deg, #F0C850, #E0A800);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      color: var(--text-dim);
      font-size: 1.2rem;
      margin-bottom: 2.5rem;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #6C3CE1, #8B5CF6);
      color: white;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      box-shadow: var(--shadow-glow);
      letter-spacing: 0.5px;
      transition: var(--transition-smooth);
    }
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(108, 60, 225, 0.8);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid rgba(108, 60, 225, 0.5);
      color: var(--text-light);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      transition: var(--transition-smooth);
    }
    .btn-outline:hover {
      background: rgba(108, 60, 225, 0.1);
      border-color: var(--primary-purple);
    }
    .hero-visual {
      flex: 1;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      min-height: 360px;
      box-shadow: 0 0 40px rgba(108, 60, 225, 0.2);
      border: 1px solid rgba(255,255,255,0.1);
    }
    @media (max-width: 768px) {
      .hero-container {
        flex-direction: column;
      }
      .hero-content {
        flex: 1;
      }
      .hero-visual {
        width: 100%;
        min-height: 260px;
      }
    }

    /* 通用板块标题 */
    .section-title {
      font-family: var(--font-heading);
      font-size: clamp(2rem, 3.5vw, 2.5rem);
      font-weight: 700;
      color: var(--white);
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-dim);
      max-width: 650px;
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    /* 功能卡片 - 非对称网格 */
    .features-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 28px;
    }
    .feature-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px) saturate(180%);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: var(--transition-smooth);
      box-shadow: var(--shadow-card);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      border-color: rgba(108, 60, 225, 0.4);
      box-shadow: 0 16px 40px rgba(0,0,0,0.5), 0 0 12px rgba(108,60,225,0.4);
    }
    .feature-icon {
      width: 48px;
      height: 48px;
      background: rgba(108, 60, 225, 0.2);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--star-gold);
      font-size: 1.6rem;
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-weight: 600;
      font-size: 1.5rem;
      margin-bottom: 12px;
      color: white;
    }
    @media (max-width: 900px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 场景交错布局 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 70px;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-img {
      flex: 0 0 45%;
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      min-height: 300px;
      border: 1px solid rgba(255,255,255,0.1);
    }
    .scenario-text h3 {
      font-size: 1.8rem;
      font-weight: 600;
      color: white;
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .scenario-row, .scenario-row.reverse {
        flex-direction: column;
      }
      .scenario-img {
        width: 100%;
      }
    }

    /* 案例数据 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
      margin: 40px 0;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--star-gold);
    }
    .client-logos {
      display: flex;
      gap: 30px;
      flex-wrap: wrap;
      filter: grayscale(1);
      transition: 0.3s;
    }
    .client-logos img {
      height: 40px;
      opacity: 0.7;
    }
    .client-logos img:hover {
      filter: none;
      opacity: 1;
    }

    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .pricing-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      border-radius: var(--radius-card);
      padding: 36px 24px;
      border: 1px solid var(--glass-border);
      transition: var(--transition-smooth);
    }
    .pricing-card.featured {
      border-color: var(--star-gold);
      box-shadow: 0 0 30px rgba(240,200,80,0.3);
      transform: scale(1.02);
    }
    @media (max-width: 768px) {
      .pricing-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-item {
      background: rgba(20,16,50,0.4);
      border-radius: 12px;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      color: white;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-light);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #1A1040, #2D1B69);
      border-radius: var(--radius-container);
      padding: 70px 40px;
      text-align: center;
    }
    .footer {
      background: #08061A;
      border-top: 1px solid rgba(108,60,225,0.2);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }