/* roulang page: index */
:root {
      --deep-navy: #0A0E27;
      --dark-bg: #060918;
      --cyan: #00F0FF;
      --cyan-hover: #33F5FF;
      --red: #FF4655;
      --red-hover: #D93642;
      --white: #FFFFFF;
      --gray-light: #FAFAFC;
      --text-main: #1F2937;
      --text-muted: #6B7280;
      --border-light: #E5E7EB;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --radius-md: 12px;
      --radius-btn: 8px;
      --transition: 0.25s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Roboto', sans-serif;
      background-color: var(--gray-light);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 顶部信息条 */
    .utility-bar {
      background: var(--deep-navy);
      color: #ccc;
      font-size: 12px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
      letter-spacing: 0.3px;
    }
    .utility-bar .brand-domain {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .utility-bar .action-link {
      color: var(--cyan);
      font-weight: 500;
      margin-left: 12px;
      cursor: pointer;
    }
    .utility-bar .action-link:hover {
      color: var(--cyan-hover);
    }
    /* 主导航 */
    .main-nav {
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(10px);
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
      position: sticky;
      top: 0;
      z-index: 1000;
      box-shadow: 0 2px 10px rgba(0,0,0,0.04);
      transition: box-shadow 0.3s;
    }
    .main-nav.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-text {
      font-size: 22px;
      font-weight: 700;
      color: var(--deep-navy);
      letter-spacing: 1px;
    }
    .logo-text span {
      color: var(--cyan);
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan);
      transition: width 0.25s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-links a:hover {
      color: var(--deep-navy);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--deep-navy);
    }
    /* 按钮 */
    .btn-primary-cyan {
      background: var(--cyan);
      border: none;
      color: var(--deep-navy);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-primary-cyan:hover {
      background: var(--cyan-hover);
      box-shadow: 0 0 12px rgba(0,240,255,0.5);
      color: #000;
    }
    .btn-outline-cyan {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-outline-cyan:hover {
      background: rgba(0,240,255,0.1);
      color: var(--cyan-hover);
    }
    .btn-red {
      background: var(--red);
      border: none;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-red:hover {
      background: var(--red-hover);
      box-shadow: 0 4px 14px rgba(255,70,85,0.4);
    }
    /* Hero */
    #hero {
      background: linear-gradient(135deg, #0A0E27 0%, #060918 100%);
      position: relative;
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: white;
      overflow: hidden;
    }
    .hero-bg-pattern {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      width: 100%;
    }
    .hero-title {
      font-size: 42px;
      font-weight: 700;
      line-height: 1.3;
    }
    .hero-sub {
      color: #B0B8D0;
      font-size: 18px;
      margin: 20px 0 30px;
    }
    .data-cards-row {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
      margin: 30px 0;
    }
    .glass-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 16px;
      padding: 18px 24px;
      flex: 1;
      min-width: 140px;
      text-align: center;
    }
    .glass-card .data-number {
      font-size: 28px;
      font-weight: 700;
      color: var(--cyan);
      animation: pulse-opacity 2s infinite;
    }
    .glass-card .data-label {
      font-size: 14px;
      color: rgba(255,255,255,0.8);
    }
    @keyframes pulse-opacity {
      0% { opacity: 0.9; }
      50% { opacity: 1; }
      100% { opacity: 0.9; }
    }
    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 28px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--deep-navy);
    }
    .section-desc {
      color: var(--text-muted);
      max-width: 700px;
      margin-bottom: 48px;
    }
    /* 卡片 */
    .card-custom {
      background: var(--white);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
      border: none;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .service-img {
      height: 180px;
      object-fit: cover;
      border-radius: var(--radius-md) var(--radius-md) 0 0;
    }
    /* 对比栏 */
    .compare-box {
      border-radius: var(--radius-md);
      padding: 24px;
      height: 100%;
    }
    .compare-advantage {
      background: #E6FFFA;
    }
    .compare-disadvantage {
      background: #FFE8EA;
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background: white;
      color: var(--deep-navy);
      box-shadow: none;
      border-left: 3px solid var(--cyan);
    }
    .accordion-button {
      font-weight: 600;
      font-size: 16px;
    }
    /* 表单 */
    .form-control {
      border: 1px solid #D1D5DB;
      border-radius: var(--radius-btn);
      padding: 12px;
    }
    .form-control:focus {
      border-color: var(--cyan);
      box-shadow: 0 0 0 0.2rem rgba(0,240,255,0.25);
    }
    /* 页脚 */
    footer {
      background: var(--dark-bg);
      color: #9CA3AF;
      padding: 48px 0 24px;
    }
    footer a:hover {
      color: var(--cyan);
    }
    @media (max-width: 992px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(10,14,39,0.95);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        backdrop-filter: blur(12px);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links a {
        color: white;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 32px;
      }
    }
    @media (max-width: 768px) {
      section {
        padding: 48px 0;
      }
      .data-cards-row {
        flex-direction: column;
      }
    }