/* roulang page: index */
/* :root 设计变量 */
    :root {
      --primary-purple: #6C3CF0;
      --primary-purple-hover: #8B5CF6;
      --accent-cyan: #00E5CC;
      --gold: #FFB300;
      --deep-black: #0A0E1A;
      --star-cloud: #F4F3F9;
      --card-bg: #FFFFFF;
      --text-main: #0A0E1A;
      --text-secondary: #3A3A4A;
      --text-light: #FFFFFF;
      --shadow-card: 0 8px 32px rgba(108,60,240,0.12);
      --shadow-hover: 0 16px 48px rgba(108,60,240,0.2);
      --border-card: 1px solid rgba(108,60,240,0.08);
      --radius-lg: 16px;
      --radius-pill: 50px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-body);
      background-color: #fff;
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 板块间距 */
    section {
      padding: 120px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
    }
    /* 导航栏 Foundation Top Bar 改造 */
    .custom-nav {
      background: #fff;
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      position: sticky;
      top: 0;
      z-index: 1000;
      border-bottom: 2px solid transparent;
      transition: border-color 0.25s ease;
    }
    .custom-nav.scrolled {
      border-bottom-color: var(--accent-cyan);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      padding: 12px 0;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-purple);
      font-family: var(--font-heading);
      text-decoration: none;
    }
    .logo-icon {
      font-size: 2rem;
      color: var(--accent-cyan);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-weight: 500;
      color: var(--text-secondary);
    }
    .nav-links a {
      text-decoration: none;
      color: var(--text-secondary);
      font-size: 1rem;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -3px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.2s ease;
    }
    .nav-links a:hover {
      color: var(--primary-purple);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-capsule {
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-hover));
      color: #fff;
      font-weight: 600;
      padding: 10px 26px;
      border-radius: var(--radius-pill);
      text-decoration: none;
      display: inline-block;
      transition: all 0.25s ease;
      box-shadow: 0 4px 12px rgba(108,60,240,0.3);
      font-size: 0.95rem;
      white-space: nowrap;
    }
    .btn-capsule:hover {
      filter: brightness(1.15);
      box-shadow: 0 8px 20px rgba(108,60,240,0.45);
      color: #fff;
    }
    /* 移动端汉堡菜单 */
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--primary-purple);
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        background: rgba(10,14,26,0.97);
        backdrop-filter: blur(20px);
        padding: 30px 20px;
        gap: 24px;
        border-radius: 0 0 24px 24px;
        margin-top: 10px;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        color: #fff;
        font-size: 1.3rem;
        font-weight: 600;
      }
      .hamburger {
        display: block;
      }
      .btn-capsule.desktop-only {
        display: none;
      }
      .mobile-cta {
        display: block !important;
        width: 100%;
        text-align: center;
        margin-top: 10px;
      }
    }
    @media (min-width: 769px) {
      .mobile-cta {
        display: none;
      }
    }
    /* Hero 背景与动态粒子效果 */
    #hero {
      background: var(--deep-black);
      position: relative;
      overflow: hidden;
      padding: 100px 0 120px;
    }
    .hero-particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-family: var(--font-heading);
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: 2px;
      background: linear-gradient(to right, #C084FC, var(--accent-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 1.2rem;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2rem;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary-purple), #8B5CF6);
      border: none;
      color: #fff;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      text-decoration: none;
      transition: all 0.25s;
      box-shadow: 0 6px 18px rgba(108,60,240,0.5);
      display: inline-block;
    }
    .btn-primary:hover {
      filter: brightness(1.2);
      box-shadow: 0 8px 24px rgba(108,60,240,0.7);
      color: #fff;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      text-decoration: none;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(0,229,204,0.1);
      color: var(--accent-cyan);
    }
    .hero-visual {
      flex: 1;
      text-align: right;
      position: relative;
    }
    .hero-visual img {
      max-height: 380px;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(108,60,240,0.3);
    }
    .data-badge {
      position: absolute;
      bottom: -20px;
      right: 10px;
      background: var(--gold);
      color: #0A0E1A;
      font-weight: 700;
      padding: 10px 22px;
      border-radius: 40px;
      font-size: 1.2rem;
      box-shadow: 0 10px 20px rgba(255,179,0,0.4);
    }
    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 32px;
      }
      .hero-visual {
        text-align: center;
        margin-top: 30px;
      }
      .btn-group {
        justify-content: center;
      }
    }
    /* 板块标题 */
    .section-title {
      font-family: var(--font-heading);
      font-size: 36px;
      font-weight: 700;
      text-align: center;
      margin-bottom: 1.5rem;
      color: var(--text-main);
    }
    .title-decor {
      width: 60px;
      height: 4px;
      background: linear-gradient(to right, var(--accent-cyan), transparent);
      margin: 0 auto 40px;
      border-radius: 2px;
    }
    /* 卡片系统 */
    .card-grid {
      display: grid;
      gap: 24px;
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      border: var(--border-card);
      transition: all 0.3s ease;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      font-size: 2.2rem;
      color: var(--accent-cyan);
      margin-bottom: 18px;
    }
    .card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 0.8rem;
    }
    /* 数据数字 */
    .stat-number {
      font-size: 56px;
      font-weight: 800;
      color: var(--gold);
      text-shadow: 0 0 12px rgba(255,179,0,0.5);
    }
    /* FAQ 手风琴 */
    .accordion-title {
      font-weight: 600;
      border-left: 4px solid transparent;
      transition: 0.2s;
    }
    .accordion-item.is-active .accordion-title {
      border-left-color: var(--accent-cyan);
      color: var(--primary-purple);
    }
    /* CTA 全宽 */
    .cta-full {
      background: radial-gradient(circle at 30% 40%, rgba(108,60,240,0.5), var(--deep-black));
      text-align: center;
    }
    footer {
      background: var(--deep-black);
      color: #ccc;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }