/* roulang page: index */
:root {
      --primary: #4A1D8F;
      --highlight: #00E5FF;
      --gradient-start: #4A1D8F;
      --gradient-end: #00E5FF;
      --bg-dark: #0B0C10;
      --bg-card: rgba(30, 31, 36, 0.7);
      --card-solid: #1E1F24;
      --text-primary: #FFFFFF;
      --text-secondary: #B0B3C1;
      --text-highlight: #00E5FF;
      --success: #00D68F;
      --warning: #FF9100;
      --border-light: rgba(255, 255, 255, 0.08);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 16px 48px rgba(0, 229, 255, 0.15);
      --radius-lg: 16px;
      --radius-pill: 50px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --backdrop-blur: blur(12px);
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-dark);
      color: var(--text-secondary);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, .logo, .nav-link, .btn {
      font-family: var(--font-heading);
    }
    a {
      text-decoration: none;
      color: var(--text-highlight);
      transition: all 0.2s ease;
    }
    a:hover {
      color: var(--highlight);
    }
    .section-padding {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 60px 0;
      }
    }
    /* 导航 */
    .navbar {
      background: rgba(11, 12, 16, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      z-index: 1030;
      padding: 0.8rem 0;
    }
    .navbar-brand {
      font-size: 24px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--primary), var(--highlight));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }
    .nav-link {
      color: var(--text-secondary) !important;
      font-weight: 500;
      margin: 0 4px;
      padding: 8px 16px !important;
      border-radius: 30px;
      transition: all 0.2s;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--highlight) !important;
      background: rgba(0, 229, 255, 0.05);
    }
    .nav-link.active {
      border-bottom: 2px solid var(--highlight);
    }
    .btn-primary-custom {
      background: linear-gradient(135deg, var(--primary), var(--highlight));
      border: none;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 50px;
      box-shadow: 0 4px 20px rgba(0, 229, 255, 0.3);
      transition: all 0.3s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary-custom:hover {
      filter: brightness(1.1);
      transform: scale(1.05);
      box-shadow: 0 8px 28px rgba(0, 229, 255, 0.45);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--highlight);
      color: var(--highlight);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 50px;
      transition: all 0.3s;
      display: inline-block;
      text-align: center;
    }
    .btn-outline-custom:hover {
      background: rgba(0, 229, 255, 0.1);
      color: var(--highlight);
    }
    .text-link {
      color: var(--highlight);
      font-weight: 500;
      transition: 0.2s;
      display: inline-flex;
      align-items: center;
    }
    .text-link:hover {
      text-decoration: underline;
      color: var(--highlight);
    }
    /* Hero */
    .hero {
      min-height: 90vh;
      background: radial-gradient(circle at 80% 30%, rgba(74,29,143,0.4) 0%, rgba(0,229,255,0.08) 40%, #0B0C10 70%);
      display: flex;
      align-items: center;
      position: relative;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 900;
      line-height: 1.2;
      background: linear-gradient(to right, #fff, var(--highlight));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.2rem;
    }
    .hero .subtitle {
      font-size: 20px;
      color: var(--highlight);
      font-weight: 500;
    }
    .hero-desc {
      font-size: 18px;
      color: var(--text-secondary);
      max-width: 550px;
    }
    .hero-visual {
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .visual-abstract {
      width: 100%;
      max-width: 500px;
      height: 400px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
      opacity: 0.9;
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 32px;
      }
      .hero .subtitle {
        font-size: 18px;
      }
      .visual-abstract {
        height: 250px;
        margin-top: 2rem;
      }
    }
    /* 卡片系统 */
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      padding: 32px;
      transition: all 0.3s ease;
      height: 100%;
    }
    .glass-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-glow);
      border-color: rgba(0, 229, 255, 0.25);
    }
    .icon-box {
      width: 48px;
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--highlight);
      font-size: 32px;
      margin-bottom: 1.2rem;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: white;
      margin-bottom: 1rem;
    }
    .data-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--success);
      line-height: 1;
    }
    .service-card {
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      overflow: hidden;
      display: flex;
      flex-direction: row;
      margin-bottom: 2rem;
      transition: 0.3s;
    }
    .service-card:hover {
      box-shadow: var(--shadow-glow);
    }
    .service-img {
      width: 45%;
      min-height: 260px;
      object-fit: cover;
      background: #2a2b30;
    }
    .service-body {
      padding: 2rem;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .tag {
      background: rgba(255, 145, 0, 0.2);
      color: var(--warning);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      margin-right: 6px;
    }
    .case-cover {
      height: 200px;
      background-size: cover;
      background-position: center;
      border-radius: 16px 16px 0 0;
    }
    .process-step {
      text-align: center;
      position: relative;
    }
    .step-circle {
      width: 64px;
      height: 64px;
      border: 2px solid var(--highlight);
      color: white;
      font-size: 28px;
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1rem;
      background: rgba(0,229,255,0.05);
    }
    .accordion-button {
      background: rgba(30,31,36,0.8);
      color: white;
      font-weight: 600;
      border-radius: 12px !important;
      border: none;
      padding: 1.2rem 1.5rem;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(0,229,255,0.1);
      color: white;
      box-shadow: none;
    }
    .accordion-item {
      background: transparent;
      border: none;
      margin-bottom: 12px;
    }
    .footer {
      background: #0B0C10;
      color: #6C6F7E;
    }
    .footer a {
      color: #B0B3C1;
    }
    .footer a:hover {
      color: var(--highlight);
    }
    @media (max-width: 992px) {
      .service-card {
        flex-direction: column;
      }
      .service-img {
        width: 100%;
        height: 220px;
      }
    }