/* roulang page: index */
:root {
      --primary-purple: #6C2BD9;
      --primary-violet: #8B5CF6;
      --accent-orange: #F97316;
      --accent-red: #EF4444;
      --bg-deep: #0F0B1A;
      --card-surface: rgba(255,255,255,0.04);
      --card-border: rgba(139,92,246,0.15);
      --text-primary: #FFFFFF;
      --text-secondary: #C4B5FD;
      --text-muted: #8B7AA0;
      --gradient-main: linear-gradient(135deg, #6C2BD9 0%, #0F0B1A 85%);
      --gradient-btn: linear-gradient(90deg, #6C2BD9 0%, #F97316 100%);
      --gradient-text: linear-gradient(90deg, #6C2BD9, #F97316);
      --shadow-card: 0 8px 30px rgba(108,43,217,0.15);
      --shadow-hover: 0 16px 48px rgba(108,43,217,0.3);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-badge: 12px;
      --container-max: 1200px;
      --nav-height: 72px;
      --transition: all 0.25s ease;
     
      font-size: 16px;
    }

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

    body {
      font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-secondary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(15, 11, 26, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(139,92,246,0.2);
      z-index: 1000;
      transition: var(--transition);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-primary);
      letter-spacing: 1px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--gradient-btn);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      color: white;
      transform: rotate(2deg);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 36px;
      list-style: none;
    }

    .nav-menu a {
      font-weight: 500;
      color: var(--text-muted);
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }
    .nav-menu a:hover, .nav-menu a.active {
      color: var(--text-primary);
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--gradient-btn);
      transition: width 0.25s;
    }
    .nav-menu a:hover::after, .nav-menu a.active::after {
      width: 100%;
    }

    .btn-primary-small {
      background: var(--gradient-btn);
      border: none;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      color: white;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(108,43,217,0.3);
      white-space: nowrap;
    }
    .btn-primary-small:hover {
      filter: brightness(1.1);
      transform: scale(1.02);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 3px;
      background: var(--primary-violet);
      border-radius: 2px;
      transition: var(--transition);
    }

    @media (max-width: 768px) {
      .hamburger {
        display: flex;
      }
      .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: rgba(15, 11, 26, 0.96);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 32px 0;
        gap: 28px;
        transform: translateY(-150%);
        transition: transform 0.35s ease;
        border-bottom: 1px solid rgba(139,92,246,0.3);
      }
      .nav-menu.active-mobile {
        transform: translateY(0);
      }
      .btn-primary-small.desktop-cta {
        display: none;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: var(--gradient-main);
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(circle at 30% 40%, rgba(139,92,246,0.2) 0%, transparent 60%);
      pointer-events: none;
    }
    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      flex-wrap: wrap;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-size: clamp(2.6rem, 5vw, 3.8rem);
      font-weight: 800;
      color: #FFFFFF;
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--gradient-btn);
      border: none;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      color: white;
      cursor: pointer;
      transition: all 0.25s;
      box-shadow: 0 6px 18px rgba(108,43,217,0.4);
      font-size: 1rem;
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(249,115,22,0.35);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary-violet);
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      color: white;
      cursor: pointer;
      transition: all 0.25s;
    }
    .btn-outline:hover {
      border-color: var(--accent-orange);
      background: rgba(249,115,22,0.06);
    }
    .hero-image {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
    }
    .hero-image img {
      max-width: 500px;
      filter: drop-shadow(0 20px 40px rgba(108,43,217,0.4));
    }

    /* sections */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 16px;
      text-align: center;
      position: relative;
      display: inline-block;
      left: 50%;
      transform: translateX(-50%);
    }
    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background: var(--gradient-btn);
      margin: 12px auto 0;
      border-radius: 4px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 30px;
      margin-top: 48px;
    }
    @media (max-width: 1023px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 640px) {
      .grid-3 { grid-template-columns: 1fr; }
    }

    .card {
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(10px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 30px 24px;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-card);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(139,92,246,0.45);
    }

    .pain-card {
      background: rgba(180,70,70,0.08);
    }
    .service-icon {
      width: 56px;
      height: 56px;
      background: rgba(139,92,246,0.2);
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 28px;
    }
    .badge {
      background: rgba(15,11,26,0.7);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 16px;
      border-radius: 20px;
      color: var(--accent-orange);
      font-weight: 700;
      margin-top: 16px;
    }

    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 32px;
      margin-top: 40px;
    }
    .stat-badge {
      background: rgba(255,255,255,0.04);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-badge);
      padding: 24px 28px;
      text-align: center;
      min-width: 150px;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      background: linear-gradient(90deg, #C084FC, #F97316);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    .testimonials-slider {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 20px 0;
      scroll-snap-type: x mandatory;
    }
    .testimonial-card {
      flex: 0 0 320px;
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(10px);
      border-left: 4px solid;
      border-image: linear-gradient(180deg, #8B5CF6, #F97316) 1;
      padding: 24px;
      border-radius: 12px;
      scroll-snap-align: start;
    }

    .faq-item {
      border-bottom: 1px solid rgba(139,92,246,0.2);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.2rem;
      color: white;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
    }

    .cta-section {
      background: radial-gradient(circle at 30% 40%, #3b1f6e, #0F0B1A);
      text-align: center;
      border-radius: 24px 24px 0 0;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }
    .footer a { color: var(--text-muted); }