/* roulang page: index */
:root {
      --deep-black: #0A0E17;
      --electric-green: #00F0A8;
      --neon-pink: #FF3C78;
      --light-gray: #F5F5F7;
      --dark-gray: #1E2530;
      --text-white: #FFFFFF;
      --text-dark: #0A0E17;
      --text-muted: #8A8F98;
      --card-radius: 16px;
      --btn-radius: 50px;
      --nav-radius: 20px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.08);
      --shadow-glow: 0 0 20px rgba(0,240,168,0.4);
      --transition-base: 0.3s ease;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "SF Mono", "Menlo", monospace;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-heading);
      background-color: var(--deep-black);
      color: var(--text-white);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, .h1, .h2, .h3, .h4 {
      font-weight: 700;
      letter-spacing: -0.02em;
    }

    h1 {
      font-weight: 800;
      font-size: 3.5rem;
    }

    h2 {
      font-size: 2.4rem;
      margin-bottom: 1.5rem;
    }

    .text-muted-custom {
      color: var(--text-muted);
    }

    .bg-deep {
      background-color: var(--deep-black);
    }

    .bg-dark-gray {
      background-color: var(--dark-gray);
    }

    .bg-light {
      background-color: var(--light-gray);
      color: var(--text-dark);
    }

    .text-electric {
      color: var(--electric-green);
    }

    .text-pink {
      color: var(--neon-pink);
    }

    .btn-primary-custom {
      background-color: var(--electric-green);
      color: var(--deep-black);
      font-weight: 700;
      border: none;
      border-radius: var(--btn-radius);
      padding: 0.75rem 2.2rem;
      transition: var(--transition-base);
      box-shadow: 0 4px 12px rgba(0,240,168,0.25);
    }

    .btn-primary-custom:hover {
      background-color: #33FFBB;
      box-shadow: var(--shadow-glow);
      color: var(--deep-black);
      transform: translateY(-2px);
    }

    .btn-outline-pink {
      border: 2px solid var(--neon-pink);
      color: var(--neon-pink);
      background: transparent;
      border-radius: var(--btn-radius);
      padding: 0.75rem 2.2rem;
      font-weight: 700;
      transition: var(--transition-base);
    }

    .btn-outline-pink:hover {
      background-color: var(--neon-pink);
      color: white;
      border-color: var(--neon-pink);
      transform: translateY(-2px);
    }

    .card-custom {
      border-radius: var(--card-radius);
      padding: 2rem;
      background: var(--dark-gray);
      border: 1px solid rgba(255,255,255,0.05);
      transition: var(--transition-base);
      height: 100%;
    }

    .bg-light .card-custom {
      background: #FFFFFF;
      border: 1px solid rgba(0,0,0,0.04);
      box-shadow: var(--shadow-sm);
    }

    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 28px rgba(0,0,0,0.15);
      border-color: rgba(0,240,168,0.2);
    }

    .icon-circle {
      width: 56px;
      height: 56px;
      background: rgba(0,240,168,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--electric-green);
      font-size: 1.8rem;
      margin-bottom: 1.5rem;
    }

    .section-padding {
      padding: 5rem 0;
    }

    @media (max-width: 768px) {
      h1 {
        font-size: 2.5rem;
      }
      h2 {
        font-size: 1.9rem;
      }
      .section-padding {
        padding: 3.5rem 0;
      }
      .card-custom {
        padding: 1.5rem;
      }
    }

    /* 导航卡片化面板 */
    .navbar-custom {
      background: var(--dark-gray);
      border-radius: var(--nav-radius);
      padding: 0.6rem 1.8rem;
      margin: 1rem auto;
      max-width: 96%;
      box-shadow: 0 8px 24px rgba(0,0,0,0.4);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255,255,255,0.08);
    }

    .nav-card-item {
      background: rgba(255,255,255,0.05);
      border-radius: 12px;
      padding: 0.5rem 1.2rem;
      transition: var(--transition-base);
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 0.4rem;
      font-weight: 500;
      text-decoration: none;
    }

    .nav-card-item:hover {
      background: rgba(0,240,168,0.15);
      color: var(--electric-green);
    }

    .navbar-toggler {
      border: none;
      color: white;
    }

    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255,255,255,0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }

    .logo-text {
      font-weight: 800;
      font-size: 1.8rem;
      background: linear-gradient(135deg, var(--electric-green) 0%, var(--neon-pink) 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.5px;
    }

    /* Hero视觉区 */
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      min-height: 380px;
      box-shadow: 0 0 60px rgba(0,240,168,0.15);
      border: 1px solid rgba(255,255,255,0.1);
    }

    .data-number {
      font-family: var(--font-mono);
      font-size: 3rem;
      font-weight: 800;
      color: var(--electric-green);
    }

    .accordion-custom .accordion-item {
      background: var(--dark-gray);
      border: none;
      border-radius: 12px;
      margin-bottom: 12px;
    }

    .accordion-custom .accordion-button {
      background: transparent;
      color: white;
      font-weight: 700;
      box-shadow: none;
      border-radius: 12px;
      padding: 1.2rem 1.5rem;
    }

    .accordion-custom .accordion-button:not(.collapsed) {
      background: rgba(0,240,168,0.08);
      color: var(--electric-green);
    }

    .accordion-custom .accordion-body {
      color: var(--text-muted);
    }

    .footer-top-line {
      height: 2px;
      background: var(--electric-green);
      width: 60px;
      margin-bottom: 2rem;
    }

    .social-icon {
      width: 40px;
      height: 40px;
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      color: white;
      margin-right: 8px;
      transition: var(--transition-base);
    }

    .social-icon:hover {
      background: var(--electric-green);
      border-color: var(--electric-green);
      color: var(--deep-black);
    }

    input.form-control-custom {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: var(--btn-radius);
      padding: 0.8rem 1.5rem;
      color: white;
      transition: var(--transition-base);
    }

    input.form-control-custom:focus {
      border-color: var(--electric-green);
      box-shadow: 0 0 12px rgba(0,240,168,0.3);
      background: rgba(0,240,168,0.02);
    }