/* roulang page: index */
:root {
      --deep-purple: #2D0A42;
      --electric-purple: #8B2FC9;
      --champagne-gold: #D4AF37;
      --dark-charcoal: #1A1A1A;
      --pure-black: #0A0A0A;
      --text-white: #FFFFFF;
      --text-light-gray: #B0B0B0;
      --text-muted: #7A7A7A;
      --border-gold-dim: rgba(212, 175, 55, 0.2);
      --border-glow: rgba(139, 47, 201, 0.5);
      --card-bg: rgba(255, 255, 255, 0.04);
      --card-hover-bg: rgba(255, 255, 255, 0.08);
      --radius-card: 16px;
      --radius-button: 40px;
      --shadow-glow: 0 8px 32px rgba(139, 47, 201, 0.25);
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--dark-charcoal);
      color: var(--text-light-gray);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
      background-image: radial-gradient(circle at 20% 10%, rgba(45, 10, 66, 0.7) 0%, #0A0A0A 90%);
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-smooth);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }

    /* 导航栏 - 桌面端顶部悬浮 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background var(--transition-smooth), box-shadow var(--transition-smooth);
      background: transparent;
      padding: 16px 0;
    }

    .main-header.scrolled {
      background: rgba(10, 10, 10, 0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 28px;
      font-weight: 700;
      letter-spacing: 2px;
      color: var(--champagne-gold);
      text-shadow: 0 0 12px rgba(212, 175, 55, 0.4);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: white;
      font-weight: 400;
      font-size: 18px;
      margin-left: 4px;
      letter-spacing: 0;
    }

    .desktop-nav {
      display: flex;
      gap: 40px;
      align-items: center;
    }
    .desktop-nav a {
      color: var(--text-light-gray);
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding: 4px 0;
    }
    .desktop-nav a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--champagne-gold);
      transition: width 0.3s;
    }
    .desktop-nav a:hover {
      color: white;
    }
    .desktop-nav a:hover::after {
      width: 100%;
    }

    .mobile-bottom-nav {
      display: none;
    }

    /* Hero */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
      isolation: isolate;
    }
    .hero-section::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(45,10,66,0.8) 0%, rgba(10,10,10,0.9) 100%);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      padding: 0 24px;
    }
    .hero-content h1 {
      font-size: 48px;
      font-weight: 700;
      color: white;
      line-height: 1.2;
      margin-bottom: 20px;
      text-shadow: 0 4px 20px rgba(0,0,0,0.6);
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-light-gray);
      margin-bottom: 40px;
      max-width: 600px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--electric-purple);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 16px;
      transition: all 0.3s;
      box-shadow: 0 4px 14px rgba(139, 47, 201, 0.5);
    }
    .btn-primary:hover {
      background: #A855F7;
      transform: scale(1.02);
      box-shadow: 0 8px 22px rgba(168, 85, 247, 0.7);
    }
    .btn-outline {
      border: 1.5px solid var(--champagne-gold);
      color: var(--champagne-gold);
      background: transparent;
      padding: 14px 36px;
      border-radius: var(--radius-button);
      font-weight: 600;
      transition: all 0.3s;
    }
    .btn-outline:hover {
      background: rgba(212, 175, 55, 0.1);
      border-color: #E5C76B;
      color: #E5C76B;
    }

    /* 通用板块 */
    .section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 600;
      color: var(--champagne-gold);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-desc {
      text-align: center;
      color: var(--text-light-gray);
      max-width: 700px;
      margin: 0 auto 60px;
      font-size: 17px;
    }

    /* 痛点与方案 */
    .pain-solution-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .pain-card, .solution-card {
      background: var(--card-bg);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-gold-dim);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: all var(--transition-smooth);
    }
    .pain-card:hover, .solution-card:hover {
      border-color: var(--champagne-gold);
      transform: translateY(-4px);
      box-shadow: var(--shadow-glow);
    }

    /* 服务矩阵 交错布局 */
    .services-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 30px;
      margin-top: 20px;
    }
    .service-card {
      background: var(--card-bg);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-gold-dim);
      border-radius: var(--radius-card);
      padding: 28px;
      display: flex;
      flex-direction: column;
      transition: all var(--transition-smooth);
    }
    .service-card:hover {
      border-color: var(--champagne-gold);
      transform: translateY(-4px);
      background: var(--card-hover-bg);
    }
    .service-icon {
      font-size: 32px;
      color: var(--champagne-gold);
      margin-bottom: 16px;
    }
    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      color: white;
      margin-bottom: 10px;
    }

    /* 数据背书 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
      margin: 40px 0;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 44px;
      font-weight: 700;
      color: var(--champagne-gold);
    }

    /* 证言 */
    .testimonial-carousel {
      display: flex;
      gap: 30px;
      overflow-x: auto;
      padding: 20px 0;
      scroll-snap-type: x mandatory;
    }
    .testimonial-card {
      min-width: 300px;
      background: var(--card-bg);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-gold-dim);
      border-radius: var(--radius-card);
      padding: 28px;
      scroll-snap-align: start;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-gold-dim);
      padding: 20px 0;
    }
    .faq-question {
      font-size: 18px;
      color: white;
      font-weight: 500;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    /* 页脚 */
    .footer {
      background: #0A0A0A;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .hero-content h1 { font-size: 40px; }
      .services-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(10,10,10,0.95);
        backdrop-filter: blur(20px);
        justify-content: space-around;
        padding: 12px 8px;
        z-index: 1000;
        border-top: 1px solid var(--border-gold-dim);
      }
      .mobile-nav-item {
        color: var(--text-light-gray);
        font-size: 12px;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
      }
      .mobile-nav-item.active { color: var(--champagne-gold); }
      .hero-content h1 { font-size: 32px; }
      .pain-solution-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .section { padding: 70px 0; }
    }