/* roulang page: index */
:root {
      --primary: #7B2FFF;
      --secondary: #FF1A6C;
      --accent: #00E5FF;
      --bg-deep: #0A0A0F;
      --bg-card: #14141F;
      --bg-card-hover: #1E1E2C;
      --text-body: #B0B0C0;
      --text-heading: #FFFFFF;
      --text-muted: #8888A0;
      --border-subtle: rgba(123, 47, 255, 0.2);
      --border-glow: rgba(255, 26, 108, 0.4);
      --radius-card: 16px;
      --radius-btn: 8px;
      --shadow-card: 0 8px 24px rgba(0,0,0,0.4);
      --shadow-hover: 0 16px 36px rgba(123,47,255,0.2);
      --transition: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      background-color: var(--bg-deep);
      color: var(--text-body);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4 {
      color: var(--text-heading);
      font-weight: 600;
    }
    a {
      color: var(--accent);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--secondary);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .navbar {
      background: rgba(10,10,15,0.9);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-subtle);
      padding: 12px 0;
      transition: var(--transition);
    }
    .navbar-brand {
      font-size: 1.8rem;
      font-weight: 700;
      color: #fff !important;
      letter-spacing: 1px;
      transition: var(--transition);
    }
    .navbar-brand:hover {
      text-shadow: 0 0 12px var(--accent);
      color: var(--accent) !important;
    }
    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: #A0A0B0 !important;
      margin: 0 6px;
      position: relative;
      padding: 6px 0 !important;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }
    .nav-link:hover {
      color: var(--accent) !important;
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .navbar-toggler {
      border-color: var(--accent);
      box-shadow: none;
    }
    .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='%2300E5FF' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    @media (max-width: 992px) {
      .navbar-collapse {
        background: rgba(10,10,15,0.98);
        margin-top: 12px;
        padding: 16px;
        border-radius: 12px;
      }
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, rgba(10,10,15,0.85) 0%, rgba(20,20,31,0.7) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      padding: 140px 0 120px;
      position: relative;
    }
    .hero h1 {
      font-size: 3.8rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      text-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .highlight {
      background: linear-gradient(to right, var(--secondary), var(--primary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .btn-primary-custom {
      background: var(--secondary);
      border: none;
      color: #fff;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      box-shadow: 0 4px 14px rgba(255,26,108,0.4);
    }
    .btn-primary-custom:hover {
      background: #ff337a;
      transform: translateY(-2px);
      box-shadow: 0 8px 22px rgba(255,26,108,0.6);
      color: #fff;
    }
    .btn-outline-accent {
      border: 2px solid var(--accent);
      color: var(--accent);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      background: transparent;
      transition: var(--transition);
    }
    .btn-outline-accent:hover {
      background: rgba(0,229,255,0.1);
      color: var(--accent);
      transform: translateY(-2px);
      box-shadow: 0 0 18px rgba(0,229,255,0.3);
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2.6rem;
      }
    }
    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 1rem;
    }
    .card-custom {
      background: var(--bg-card);
      border: 1px solid rgba(255,26,108,0.1);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: var(--transition);
      box-shadow: var(--shadow-card);
    }
    .card-custom:hover {
      border-color: var(--secondary);
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 60px;
      height: 60px;
      background: rgba(123,47,255,0.15);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 1.8rem;
      margin-bottom: 1.2rem;
    }
    /* 成果数字 */
    .stat-number {
      font-size: 3.5rem;
      font-weight: 700;
      background: linear-gradient(180deg, var(--accent) 0%, var(--primary) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1.1;
    }
    /* FAQ */
    .accordion-button {
      background: var(--bg-card);
      color: #fff;
      font-weight: 600;
      border: none;
      border-bottom: 1px solid #2A2A3A;
      box-shadow: none;
      padding: 20px 24px;
    }
    .accordion-button:not(.collapsed) {
      background: #1E1E2C;
      color: var(--accent);
      box-shadow: none;
    }
    .accordion-button::after {
      filter: brightness(0) invert(1);
    }
    .accordion-body {
      background: #0E0E17;
      color: var(--text-body);
      padding: 20px 24px;
    }
    /* CTA 终局 */
    .cta-final {
      background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
      border-radius: 32px;
      padding: 70px 50px;
      margin: 40px 0;
      text-align: center;
    }
    footer {
      background: #05050A;
      border-top: 1px solid rgba(123,47,255,0.25);
      color: #8888A0;
    }
    footer a {
      color: #B0B0C0;
    }
    footer a:hover {
      color: var(--accent);
    }
    .backpic-section {
      background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      background-attachment: fixed;
      position: relative;
    }
    .backpic-section::before {
      content: '';
      position: absolute;
      top:0;left:0;right:0;bottom:0;
      background: rgba(10,10,15,0.8);
    }
    .backpic-section .container-custom {
      position: relative;
      z-index: 2;
    }