/* roulang page: index */
:root {
      --deep-blue: #0A1929;
      --dark-bg: #0A1929;
      --bg-gradient: linear-gradient(135deg, #0A1929 0%, #132F4C 100%);
      --cyan: #00E5FF;
      --cyan-dark: #0099CC;
      --orange: #FF6B35;
      --white: #FFFFFF;
      --text-light: #B0C4DE;
      --text-muted: #8899AA;
      --glass-bg: rgba(255, 255, 255, 0.05);
      --glass-border: rgba(255, 255, 255, 0.1);
      --card-shadow: 0 8px 32px rgba(0,0,0,0.4);
      --card-hover-shadow: 0 12px 40px rgba(0,229,255,0.15);
      --radius: 16px;
      --radius-sm: 8px;
      --font-heading: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
      --max-width: 1200px;
      --nav-height: 72px;
      --gap: 24px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      background: var(--dark-bg);
      background: var(--bg-gradient);
      font-family: var(--font-body);
      color: var(--text-light);
      line-height: 1.5;
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button, .btn-link {
      cursor: pointer;
      font-family: inherit;
    }
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(10, 25, 41, 0.85);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    .nav .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 100%;
    }
    .logo {
      font-family: var(--font-heading);
      font-size: 1.5rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--cyan) 0%, var(--white) 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 0.25rem;
    }
    .logo i {
      background: none;
      -webkit-text-fill-color: var(--cyan);
      font-size: 1.8rem;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-light);
      padding: 0.25rem 0;
      position: relative;
      letter-spacing: 0.3px;
      white-space: nowrap;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -3px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--cyan);
      transition: width 0.3s;
      box-shadow: 0 0 8px var(--cyan);
    }
    .nav-links a:hover {
      color: var(--cyan);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      color: var(--white);
      font-size: 1.6rem;
      padding: 8px;
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: rgba(10, 25, 41, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        padding: 2rem 1rem;
        gap: 1.8rem;
        transform: translateY(-110%);
        opacity: 0;
        transition: all 0.35s ease;
        border-bottom: 1px solid rgba(255,255,255,0.1);
      }
      .nav-links.active-mobile {
        transform: translateY(0);
        opacity: 1;
      }
      .hamburger {
        display: block;
      }
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }
    .section-title {
      font-family: var(--font-heading);
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--white);
      text-align: center;
      margin-bottom: 1rem;
      letter-spacing: -0.3px;
      position: relative;
    }
    .section-subtitle {
      font-size: 1.1rem;
      color: var(--text-light);
      text-align: center;
      margin-bottom: 3.5rem;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
    }
    .divider {
      width: 70px;
      height: 3px;
      background: linear-gradient(90deg, var(--cyan), transparent);
      margin: 0.5rem auto 0;
      border-radius: 10px;
      box-shadow: 0 0 12px rgba(0,229,255,0.4);
    }
    /* glass card */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius);
      box-shadow: var(--card-shadow);
      padding: 1.8rem;
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      box-shadow: var(--card-hover-shadow);
      border-color: rgba(0,229,255,0.25);
      transform: translateY(-3px);
    }

    /* Hero */
    #hero {
      height: 100vh;
      min-height: 650px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: radial-gradient(circle at 30% 40%, rgba(0,229,255,0.08) 0%, #0A1929 80%);
      position: relative;
      overflow: hidden;
      padding: 0 20px;
      margin-top: 0;
    }
    .hero-bg {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center 40%;
      opacity: 0.2;
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 850px;
      text-align: center;
    }
    .hero-content h1 {
      font-family: var(--font-heading);
      font-size: 3rem;
      font-weight: 900;
      color: var(--white);
      line-height: 1.25;
      letter-spacing: -0.5px;
      margin-bottom: 1.2rem;
      animation: fadeInUp 0.9s ease;
    }
    .hero-content .sub {
      font-size: 1.2rem;
      color: var(--text-light);
      margin-bottom: 2.4rem;
      animation: fadeInUp 1.1s ease;
    }
    .btn-group {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
      justify-content: center;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.9rem 2.4rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 1rem;
      transition: all 0.3s;
      border: none;
      letter-spacing: 0.4px;
      min-width: 140px;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--cyan) 0%, var(--cyan-dark) 100%);
      color: #0A1929;
      box-shadow: 0 0 20px rgba(0,229,255,0.5);
    }
    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(0,229,255,0.7);
      transform: scale(1.05);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      backdrop-filter: blur(8px);
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.1);
    }
    .btn-cta {
      background: var(--orange);
      color: white;
      box-shadow: 0 0 24px rgba(255,107,53,0.7);
    }
    .btn-cta:hover {
      box-shadow: 0 0 35px rgba(255,107,53,0.9);
      transform: scale(1.08);
    }
    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(30px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* Metrics */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: var(--gap);
      text-align: center;
    }
    .metric-num {
      font-size: 2.5rem;
      font-weight: 800;
      font-family: 'Inter', sans-serif;
      background: linear-gradient(180deg, var(--cyan) 0%, #ffffff 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .metric-label {
      color: var(--text-muted);
      font-size: 0.9rem;
      margin-top: 0.4rem;
    }

    /* services 2x3 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--gap);
    }
    .service-card i {
      font-size: 2.3rem;
      color: var(--cyan);
      margin-bottom: 1rem;
    }
    .service-card h3 {
      color: var(--white);
      font-size: 1.3rem;
      margin-bottom: 0.8rem;
    }
    .service-card p {
      font-size: 0.95rem;
      color: var(--text-light);
      margin-bottom: 1.5rem;
    }
    .link-arrow {
      color: var(--cyan);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* compare */
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
      align-items: start;
    }
    .compare-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(16px);
      border-radius: var(--radius);
      padding: 2rem;
      border: 1px solid var(--glass-border);
      text-align: center;
      transition: 0.3s;
      position: relative;
    }
    .compare-card.featured {
      border-color: var(--cyan);
      background: rgba(0,229,255,0.04);
      box-shadow: 0 0 22px rgba(0,229,255,0.2);
    }
    .badge-recommend {
      background: var(--orange);
      color: white;
      padding: 0.15rem 1rem;
      border-radius: 30px;
      font-size: 0.8rem;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      font-weight: 600;
    }
    .price {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--white);
    }
    .feature-list {
      list-style: none;
      text-align: left;
      margin: 1.8rem 0;
    }
    .feature-list li {
      padding: 0.5rem 0;
      color: var(--text-light);
    }
    .feature-list i.fa-check {
      color: var(--cyan);
      margin-right: 8px;
    }
    .feature-list i.fa-minus {
      color: #556677;
      margin-right: 8px;
    }

    /* cases carousel simplified */
    .cases-grid {
      display: flex;
      gap: var(--gap);
      overflow-x: auto;
      padding-bottom: 1rem;
    }
    .case-card {
      min-width: 280px;
      background: var(--glass-bg);
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--glass-border);
    }
    .case-card img {
      height: 170px;
      object-fit: cover;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      margin-bottom: 8px;
    }
    .faq-question {
      background: none;
      border: none;
      color: var(--white);
      font-weight: 600;
      font-size: 1.1rem;
      width: 100%;
      text-align: left;
      padding: 1rem 0;
      display: flex;
      justify-content: space-between;
    }

    /* contact */
    #contact .glass-card {
      max-width: 680px;
      margin: 0 auto;
      padding: 2.5rem;
    }
    .input-field {
      background: transparent;
      border: none;
      border-bottom: 1px solid var(--text-muted);
      width: 100%;
      padding: 0.75rem 0.3rem;
      color: var(--white);
      margin-bottom: 1.6rem;
    }

    footer {
      background: #060F1A;
      padding: 3rem 0;
    }

    @media (max-width: 1024px) {
      .metrics-grid { grid-template-columns: repeat(3,1fr); }
      .services-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .metrics-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: 1fr; }
      .compare-grid { grid-template-columns: 1fr; }
      #hero h1 { font-size: 2.2rem; }
      .nav .container { padding:0 16px; }
    }