/* roulang page: index */
:root {
      --primary: #6C3CF0;
      --primary-dark: #5A2ED0;
      --accent: #00E5A0;
      --accent-dark: #00b37d;
      --deep-black: #0A0E17;
      --frost-white: #F8F9FC;
      --gray-400: #9ca3af;
      --gray-600: #4b5563;
      --gray-800: #1f2937;
      --border-light: rgba(255, 255, 255, 0.08);
      --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 32px rgba(108, 60, 240, 0.12);
      --radius-lg: 16px;
      --radius-pill: 50px;
      --transition-smooth: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--frost-white);
      color: #1e1e2f;
      line-height: 1.8;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4 {
      letter-spacing: 0.5px;
    }
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 56px;
      background: rgba(10, 14, 23, 0.7);
      backdrop-filter: blur(12px);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: background 0.3s ease;
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .navbar-custom.scrolled {
      background: rgba(10, 14, 23, 0.95);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 20px;
      font-weight: 700;
      background: linear-gradient(135deg, #6C3CF0, #b388ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
      text-decoration: none;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-link-item {
      color: #f0f0f0;
      font-size: 14px;
      font-weight: 500;
      text-decoration: none;
      transition: color 0.2s;
    }
    .nav-link-item:hover {
      color: var(--accent);
    }
    .btn-nav-cta {
      background: var(--primary);
      color: white;
      border-radius: 50px;
      padding: 8px 20px;
      font-size: 14px;
      font-weight: 600;
      text-decoration: none;
      transition: background 0.25s, transform 0.2s;
      margin-left: 12px;
    }
    .btn-nav-cta:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      font-size: 22px;
      color: white;
      background: none;
      border: none;
    }
    /* Hero 分屏 */
    .hero-section {
      display: flex;
      min-height: 100vh;
      background-color: var(--deep-black);
      color: white;
    }
    .hero-left {
      width: 40%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 0 60px;
      background: var(--deep-black);
    }
    .hero-right {
      width: 60%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(10,14,23,0.85) 0%, rgba(10,14,23,0.2) 100%);
    }
    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
      animation: fadeInUp 0.8s ease;
    }
    .hero-sub {
      font-size: 18px;
      color: #d1d5db;
      margin-bottom: 36px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      margin-bottom: 48px;
    }
    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: white;
      padding: 14px 32px;
      border-radius: 50px;
      font-weight: 600;
      transition: 0.25s;
      text-decoration: none;
    }
    .btn-primary-custom:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(108,60,240,0.4);
    }
    .btn-outline-accent {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      padding: 14px 32px;
      border-radius: 50px;
      font-weight: 600;
      transition: 0.25s;
      text-decoration: none;
    }
    .btn-outline-accent:hover {
      background: var(--accent);
      color: var(--deep-black);
    }
    .stats-badges {
      display: flex;
      gap: 30px;
    }
    .stat-item {
      display: flex;
      flex-direction: column;
    }
    .stat-number {
      font-size: 32px;
      font-weight: 800;
      background: linear-gradient(180deg, #b388ff, #6C3CF0);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .stat-label {
      font-size: 14px;
      color: #aaa;
    }
    @keyframes fadeInUp {
      0% { opacity: 0; transform: translateY(20px); }
      100% { opacity: 1; transform: translateY(0); }
    }
    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    /* 服务卡片不对称 */
    .services-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr 1fr;
      gap: 24px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
      position: relative;
      overflow: hidden;
    }
    .service-card.wide {
      background: linear-gradient(135deg, #ffffff 0%, #f0ebff 100%);
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .service-img {
      width: 100%;
      height: 160px;
      background-size: cover;
      background-position: center;
      border-radius: 12px;
      margin-bottom: 24px;
      transition: transform 0.3s;
    }
    .service-card:hover .service-img {
      transform: scale(1.03);
    }
    .service-list {
      list-style: none;
      padding-left: 0;
    }
    .service-list li::before {
      content: "•";
      color: var(--accent);
      font-weight: bold;
      margin-right: 8px;
    }
    /* 优势横向滚动 */
    .advantages-wrapper {
      display: flex;
      gap: 24px;
      align-items: flex-start;
    }
    .scroll-area {
      width: 70%;
      display: flex;
      overflow-x: auto;
      gap: 20px;
      padding-bottom: 12px;
      scrollbar-width: thin;
      scrollbar-color: #6C3CF0 #1f2937;
    }
    .scroll-area::-webkit-scrollbar {
      height: 6px;
    }
    .scroll-area::-webkit-scrollbar-thumb {
      background: #6C3CF0;
      border-radius: 10px;
    }
    .data-card {
      min-width: 160px;
      background: white;
      border-radius: 16px;
      padding: 24px;
      text-align: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }
    .data-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--primary);
    }
    .fixed-panel {
      width: 30%;
      background: var(--deep-black);
      color: white;
      padding: 32px;
      border-radius: 16px;
      border-left: 4px solid var(--accent);
    }
    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .case-card {
      background-size: cover;
      background-position: center;
      height: 280px;
      border-radius: 16px;
      position: relative;
      overflow: hidden;
      color: white;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      padding: 24px;
    }
    .case-card::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(0deg, rgba(0,0,0,0.8) 0%, transparent 70%);
      transition: 0.3s;
    }
    .case-card:hover::before {
      background: rgba(0,0,0,0.9);
    }
    .case-content {
      position: relative;
      z-index: 2;
    }
    /* 解决方案手风琴 */
    .solution-flex {
      display: flex;
      gap: 32px;
    }
    .vertical-tabs {
      display: flex;
      flex-direction: column;
      gap: 8px;
      width: 200px;
    }
    .tab-btn {
      background: transparent;
      border: none;
      text-align: left;
      padding: 12px 16px;
      font-weight: 600;
      border-left: 4px solid transparent;
      transition: 0.2s;
      color: #555;
    }
    .tab-btn.active {
      border-left-color: var(--primary);
      color: var(--primary);
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .accordion-button {
      font-weight: 500;
    }
    /* 表单 */
    .contact-area {
      background: var(--deep-black);
      color: white;
      border-radius: 24px;
      padding: 60px;
    }
    .form-control-custom {
      background: rgba(255,255,255,0.08);
      border: 1px solid #333;
      color: white;
      border-radius: 12px;
      padding: 12px 16px;
    }
    .form-control-custom:focus {
      border-color: var(--primary);
    }
    footer {
      background: var(--deep-black);
      color: #888;
      padding: 60px 0 30px;
    }
    @media (max-width: 992px) {
      .hero-left { width: 100%; padding: 40px; }
      .hero-right { display: none; }
      .services-grid { grid-template-columns: 1fr 1fr; }
      .advantages-wrapper { flex-direction: column; }
      .scroll-area, .fixed-panel { width: 100%; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .case-grid, .faq-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .solution-flex { flex-direction: column; }
    }