/* roulang page: index */
:root {
      --brand-orange: #E8453C;
      --brand-deep-blue: #0A1628;
      --accent-gold: #D4AF37;
      --surface-light: #F0F4F8;
      --text-primary: #1A202C;
      --text-secondary: #4A5568;
      --text-on-dark: #F7FAFC;
      --white: #FFFFFF;
      --border-light: rgba(10, 22, 40, 0.06);
      --shadow-sm: 0 8px 20px -8px rgba(232, 69, 60, 0.08);
      --shadow-card: 0 20px 40px -12px rgba(232, 69, 60, 0.15);
      --shadow-elevated: 0 30px 50px -15px rgba(10, 22, 40, 0.25);
      --radius-xl: 24px;
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-pill: 40px;
      --radius-btn: 50px;
      --transition-smooth: all 0.3s cubic-bezier(0.2, 0.0, 0, 1);
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      background-color: #FBFCFE;
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    img {
      max-width: 100%;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    button, input {
      font-family: inherit;
    }

    .container {
      width: 90%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
    }

    /* 沉浸式导航 Dock */
    .nav-dock {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 92%;
      background: rgba(255, 255, 255, 0.75);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border: 1px solid rgba(255, 255, 255, 0.7);
      border-radius: var(--radius-pill);
      padding: 10px 24px;
      box-shadow: 0 12px 28px rgba(0,0,0,0.04);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 28px;
      transition: background 0.3s, box-shadow 0.3s;
    }

    .nav-dock.scrolled {
      background: rgba(255, 255, 255, 0.92);
      box-shadow: 0 18px 35px rgba(10,22,40,0.12);
      border-color: rgba(255,255,255,0.8);
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.25rem;
      letter-spacing: -0.3px;
      color: var(--brand-deep-blue);
      white-space: nowrap;
    }

    .logo-icon {
      font-size: 1.8rem;
      color: var(--brand-orange);
    }

    .domain-badge {
      font-size: 0.7rem;
      font-weight: 500;
      color: var(--text-secondary);
      margin-left: 6px;
      background: var(--surface-light);
      padding: 2px 8px;
      border-radius: 20px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
    }

    .nav-link {
      padding: 10px 16px;
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-secondary);
      border-radius: 30px;
      transition: var(--transition-smooth);
      white-space: nowrap;
      background: transparent;
    }

    .nav-link:hover {
      color: var(--brand-orange);
      background: rgba(232,69,60,0.06);
    }

    .cta-nav-btn {
      background: var(--brand-orange);
      color: white;
      border-radius: 40px;
      padding: 12px 22px;
      font-weight: 600;
      font-size: 0.95rem;
      box-shadow: 0 8px 18px rgba(232,69,60,0.3);
      transition: var(--transition-smooth);
      white-space: nowrap;
    }

    .cta-nav-btn:hover {
      background: #d63e36;
      transform: translateY(-2px);
      box-shadow: 0 15px 25px rgba(232,69,60,0.45);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 30%, #1b2a44, #0A1628);
      position: relative;
      overflow: hidden;
      color: white;
    }

    .hero-bg-img {
      position: absolute;
      right: 0;
      top: 0;
      width: 55%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center center/cover no-repeat;
      opacity: 0.5;
      mask-image: linear-gradient(to left, rgba(0,0,0,0.7), transparent);
      -webkit-mask-image: linear-gradient(to left, rgba(0,0,0,0.7), transparent);
    }

    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }

    .hero-left {
      flex: 1 1 500px;
      max-width: 650px;
    }

    .hero h1 {
      font-size: clamp(2.8rem, 7vw, 4.8rem);
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -0.8px;
      margin-bottom: 1.5rem;
    }

    .hero-highlight {
      background: linear-gradient(to right, var(--accent-gold), #f5e07b);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-desc {
      font-size: 1.3rem;
      opacity: 0.9;
      max-width: 500px;
      margin-bottom: 2.5rem;
      line-height: 1.7;
    }

    .hero-buttons {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--brand-orange);
      border: none;
      color: white;
      padding: 16px 38px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1.1rem;
      transition: var(--transition-smooth);
      box-shadow: 0 12px 24px rgba(232,69,60,0.5);
    }

    .btn-primary:hover {
      transform: translateY(-5px);
      box-shadow: 0 25px 40px rgba(232,69,60,0.7);
      background: #f05348;
    }

    .btn-outline-light {
      background: transparent;
      border: 2px solid rgba(255,255,255,0.7);
      color: white;
      padding: 16px 38px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition-smooth);
    }

    .btn-outline-light:hover {
      background: white;
      color: var(--brand-deep-blue);
      border-color: white;
    }

    .hero-badges {
      display: flex;
      gap: 30px;
      margin-top: 3rem;
    }

    .badge-item {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-md);
      padding: 14px 24px;
      text-align: center;
    }

    .badge-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--accent-gold);
    }

    /* 通用板块 */
    section {
      padding: 5rem 0;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 1rem;
      letter-spacing: -0.4px;
    }

    .section-sub {
      color: var(--text-secondary);
      font-size: 1.2rem;
      margin-bottom: 3rem;
    }

    /* 核心优势 横向大卡 */
    .features-grid {
      display: flex;
      flex-direction: column;
      gap: 28px;
    }

    .feature-card {
      background: white;
      border-radius: var(--radius-xl);
      padding: 28px 32px;
      display: flex;
      align-items: center;
      gap: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
      border: 1px solid var(--border-light);
    }

    .feature-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-card);
    }

    .feature-icon {
      font-size: 2.8rem;
      color: var(--brand-orange);
      transition: 0.3s;
    }

    .feature-card:hover .feature-icon {
      transform: scale(1.1);
      filter: drop-shadow(0 0 12px rgba(232,69,60,0.4));
    }

    /* 服务体系 图片叠底 */
    .services-masonry {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 24px;
    }

    .service-card {
      position: relative;
      border-radius: var(--radius-xl);
      overflow: hidden;
      height: 320px;
      background-size: cover;
      background-position: center;
    }

    .service-overlay {
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 24px;
      background: linear-gradient(transparent, rgba(10,22,40,0.85));
      color: white;
    }

    .service-card:hover .service-overlay {
      background: linear-gradient(transparent, rgba(10,22,40,0.95));
      padding-bottom: 32px;
    }

    /* 数据墙 */
    .data-wall {
      background: var(--brand-deep-blue);
      color: white;
      border-radius: var(--radius-xl);
      padding: 3rem 2rem;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      gap: 30px;
    }

    .data-stat {
      text-align: center;
    }

    .data-number {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--accent-gold);
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-lg);
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 24px 28px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    /* 表单 */
    .contact-input {
      background: white;
      border: none;
      border-bottom: 2px solid #CBD5E0;
      padding: 14px 16px;
      width: 100%;
      border-radius: 8px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
    }

    @media (max-width: 768px) {
      .nav-dock {
        flex-wrap: wrap;
        justify-content: center;
      }
      .hero-bg-img {
        width: 100%;
        opacity: 0.3;
      }
      .feature-card {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }