/* roulang page: index */
:root {
      --deep-navy: #0A1929;
      --cyan-electro: #00E5FF;
      --red-aggressive: #FF4655;
      --bg-light: #F4F6F9;
      --white-pure: #FFFFFF;
      --text-slate: #334155;
      --text-muted: #8899AA;
      --border-light: #E9EEF3;
      --radius-card: 12px;
      --shadow-card: 0 4px 20px rgba(10, 25, 41, 0.06);
      --shadow-elevated: 0 12px 32px rgba(10, 25, 41, 0.12);
      --transition-default: 0.25s cubic-bezier(0.2, 0.0, 0, 1.0);
      --max-width: 1280px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-slate);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-default);
    }
    button, input, textarea {
      font-family: inherit;
    }

    .container {
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 按钮系统 */
    .btn-primary {
      background-color: var(--red-aggressive);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: var(--transition-default);
      box-shadow: 0 4px 10px rgba(255, 70, 85, 0.3);
      cursor: pointer;
      border: 2px solid transparent;
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      background-color: #E63443;
      box-shadow: 0 8px 18px rgba(255, 70, 85, 0.45);
      transform: translateY(-1px);
      color: white;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--cyan-electro);
      color: var(--cyan-electro);
      padding: 14px 32px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: var(--transition-default);
      cursor: pointer;
      letter-spacing: 0.3px;
    }
    .btn-outline:hover {
      background-color: var(--cyan-electro);
      color: #0A1929;
      border-color: var(--cyan-electro);
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 24px;
      z-index: 50;
      border-bottom: 1px solid rgba(0,0,0,0.02);
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
    }
    .logo-area {
      font-weight: 700;
      font-size: 24px;
      color: var(--deep-navy);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
    }
    .logo-icon {
      font-size: 28px;
      color: var(--cyan-electro);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 16px;
      color: #1F2A44;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a:hover {
      color: var(--cyan-electro);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--cyan-electro);
      transition: 0.2s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 26px;
      color: var(--deep-navy);
    }

    /* 移动端汉堡 */
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: block;
        cursor: pointer;
      }
      .mobile-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(10,25,41,0.98);
        backdrop-filter: blur(24px);
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: flex-start;
        padding-left: 32px;
        z-index: 60;
        transform: translateX(-100%);
        transition: 0.3s ease;
      }
      .mobile-menu.open {
        transform: translateX(0);
      }
      .mobile-menu a {
        color: white;
        font-size: 28px;
        margin: 20px 0;
        font-weight: 600;
      }
      .mobile-menu .close-btn {
        position: absolute;
        top: 24px;
        right: 24px;
        background: none;
        border: none;
        color: white;
        font-size: 32px;
      }
    }

    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 55% 45%;
      gap: 32px;
      align-items: center;
      padding-top: 120px;
      padding-bottom: 60px;
    }
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 380px;
      border-radius: 24px;
      position: relative;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,229,255,0.2);
    }
    .hero-visual::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(135deg, rgba(0,229,255,0.3) 0%, rgba(10,25,41,0.5) 100%);
      mix-blend-mode: overlay;
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        padding-top: 90px;
      }
      .hero-visual {
        min-height: 260px;
        order: -1;
      }
    }

    /* 优势非对称布局 */
    .adv-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      margin-top: 48px;
    }
    .adv-item:last-child {
      grid-column: span 2;
      max-width: 66%;
      margin: 0 auto;
    }
    .adv-card {
      background: white;
      padding: 28px 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--cyan-electro);
      transition: var(--transition-default);
    }
    .adv-card:hover {
      box-shadow: var(--shadow-elevated);
      transform: translateY(-4px);
    }

    @media (max-width: 768px) {
      .adv-grid {
        grid-template-columns: 1fr;
      }
      .adv-item:last-child {
        grid-column: span 1;
        max-width: 100%;
      }
    }

    /* 服务网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
      margin-top: 40px;
    }
    .service-card {
      background: white;
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: var(--transition-default);
    }
    .service-card i {
      font-size: 36px;
      color: var(--cyan-electro);
      margin-bottom: 12px;
      transition: 0.2s;
    }
    .service-card:hover {
      box-shadow: var(--shadow-elevated);
      transform: translateY(-4px);
    }
    .service-card:hover i {
      color: var(--red-aggressive);
      transform: scale(1.1);
    }

    /* 横向滚动 */
    .roster-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 20px 0 28px;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }
    .roster-card {
      flex: 0 0 220px;
      background: white;
      border-radius: 20px;
      padding: 24px 16px;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: var(--transition-default);
      scroll-snap-align: start;
      border: 2px solid transparent;
    }
    .roster-card:hover {
      border-color: var(--cyan-electro);
      transform: translateY(-4px);
      box-shadow: var(--shadow-elevated);
    }

    /* 瀑布流 */
    .masonry-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 32px;
    }
    .masonry-item {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition-default);
    }
    .masonry-item:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-elevated);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: #0A1929;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.35s ease;
      color: #334155;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    footer {
      background: var(--deep-navy);
      color: #8899AA;
      padding: 64px 0 32px;
    }