/* roulang page: index */
:root {
      --primary: #0A1F3F;
      --accent: #00E5A0;
      --emphasis: #FF5E3A;
      --bg: #F7F9FC;
      --card-bg: #FFFFFF;
      --glass-bg: rgba(255, 255, 255, 0.6);
      --text: #1A2B3C;
      --text-secondary: #5A6B7C;
      --text-light: #B0C4DE;
      --border: rgba(255, 255, 255, 0.8);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 8px 32px rgba(10, 31, 63, 0.08);
      --shadow-hover: 0 12px 40px rgba(10, 31, 63, 0.15);
      --shadow-nav: 0 2px 20px rgba(10, 31, 63, 0.12);
      --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      padding: 16px 0;
      transition: var(--transition);
      background: transparent;
      backdrop-filter: blur(0px);
    }
    .navbar.scrolled {
      background: rgba(10, 31, 63, 0.92);
      backdrop-filter: blur(12px);
      box-shadow: var(--shadow-nav);
      padding: 12px 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .logo {
      font-weight: 700;
      font-size: 1.6rem;
      color: white;
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      letter-spacing: 1px;
      transition: var(--transition);
    }
    .logo i {
      font-size: 2rem;
      color: var(--accent);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      text-decoration: none;
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 6px 0;
      transition: var(--transition);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.3s ease;
    }
    .nav-links a:hover,
    .nav-links a:focus {
      color: white;
    }
    .nav-links a:hover::after,
    .active-nav::after {
      width: 100%;
    }
    .btn-nav {
      background: var(--accent);
      color: var(--primary) !important;
      padding: 10px 24px !important;
      border-radius: 30px;
      font-weight: 600;
      box-shadow: 0 0 15px rgba(0,229,160,0.3);
    }
    .btn-nav:hover {
      background: #00c98a;
      box-shadow: 0 0 25px rgba(0,229,160,0.5);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      cursor: pointer;
      gap: 5px;
      z-index: 60;
    }
    .hamburger span {
      width: 28px;
      height: 2px;
      background: white;
      transition: var(--transition);
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 400px;
      height: 100vh;
      background: var(--primary);
      backdrop-filter: blur(20px);
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 40px;
      z-index: 55;
      transition: right 0.4s ease;
      display: flex;
    }
    .mobile-menu.active {
      right: 0;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.4rem;
      text-decoration: none;
      font-weight: 500;
    }
    @media (max-width: 1024px) {
      .nav-links { gap: 20px; }
      .nav-links a { font-size: 0.9rem; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
    }

    /* 区块通用 */
    section {
      padding: 120px 0;
    }
    @media (max-width: 768px) {
      section { padding: 80px 0; }
    }
    h2 {
      font-size: 2.5rem;
      font-weight: 600;
      margin-bottom: 20px;
      color: var(--primary);
      line-height: 1.3;
    }
    h3 {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 12px;
    }
    p {
      color: var(--text-secondary);
      line-height: 1.8;
      margin-bottom: 1.2em;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0A1F3F 0%, #0D2B5E 100%);
      position: relative;
      overflow: hidden;
      padding: 0;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: radial-gradient(circle at 20% 30%, rgba(0,229,160,0.08) 0%, transparent 50%);
      pointer-events: none;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }
    .hero-text {
      flex: 1;
      color: white;
    }
    .hero-text h1 {
      font-size: 3.75rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
      color: white;
    }
    .hero-text h1 span {
      color: var(--accent);
      background: linear-gradient(to right, #00E5A0, #4DFFC5);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 1.15rem;
      color: #B0C4DE;
      margin-bottom: 40px;
      max-width: 90%;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: var(--primary);
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 700;
      text-decoration: none;
      box-shadow: 0 0 25px rgba(0,229,160,0.4);
      transition: var(--transition);
      border: none;
      display: inline-block;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #00c98a;
      box-shadow: 0 0 40px rgba(0,229,160,0.7);
      transform: translateY(-2px);
    }
    .btn-outline-light {
      border: 2px solid rgba(255,255,255,0.5);
      color: white;
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
    }
    .btn-outline-light:hover {
      background: white;
      color: var(--primary);
      border-color: white;
    }
    .hero-image {
      flex: 1;
      display: flex;
      justify-content: center;
      position: relative;
    }
    .hero-image img {
      max-width: 100%;
      border-radius: 24px;
      box-shadow: 0 25px 60px rgba(0,0,0,0.4);
      border: 1px solid rgba(255,255,255,0.1);
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
        padding-top: 120px;
        padding-bottom: 60px;
      }
      .hero-text h1 { font-size: 2.5rem; }
      .hero-sub { max-width: 100%; }
      .btn-group { justify-content: center; }
      .hero-image { margin-top: 30px; }
    }

    /* 卡片玻璃/普通混合 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-card);
      border-radius: var(--radius-lg);
    }
    .normal-card {
      background: white;
      box-shadow: 0 2px 12px rgba(10,31,63,0.04);
      border-radius: var(--radius-lg);
      transition: var(--transition);
    }
    .normal-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-5px);
    }

    .features-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 30px;
      margin-top: 50px;
    }
    .feature-main {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .feature-row {
      display: flex;
      gap: 20px;
      align-items: center;
      padding: 24px;
      border-radius: var(--radius-lg);
      background: white;
      box-shadow: 0 4px 16px rgba(0,0,0,0.02);
    }
    .feature-icon {
      font-size: 2.4rem;
      color: var(--accent);
    }
    .feature-stacked {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      padding: 40px 30px;
      border-radius: var(--radius-lg);
      text-align: center;
    }
    @media (max-width: 768px) {
      .features-grid { grid-template-columns: 1fr; }
      .feature-row { flex-direction: column; text-align: center; }
    }

    .services-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      margin-top: 50px;
    }
    .service-item {
      display: flex;
      gap: 24px;
      align-items: center;
      padding: 24px;
    }
    .service-img {
      width: 180px;
      height: 120px;
      object-fit: cover;
      border-radius: 12px;
    }
    @media (max-width: 768px) {
      .services-grid { grid-template-columns: 1fr; }
      .service-item { flex-direction: column; }
    }

    .data-wall {
      background: linear-gradient(135deg, #0A1F3F, #0D2B5E);
      border-radius: 24px;
      padding: 70px 40px;
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      color: white;
      margin-top: 30px;
    }
    .data-item {
      text-align: center;
    }
    .data-num {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--accent);
      font-family: 'Inter', sans-serif;
    }
    .cases-scroll {
      display: flex;
      gap: 40px;
      overflow-x: auto;
      padding: 20px 0;
      filter: grayscale(1);
      opacity: 0.7;
      transition: 0.3s;
    }
    .cases-scroll img {
      height: 50px;
      transition: 0.3s;
    }
    .cases-scroll img:hover {
      filter: grayscale(0);
      opacity: 1;
    }
    .faq-item {
      border-bottom: 1px solid #E5E9F0;
      padding: 18px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-secondary);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
      .data-wall { flex-direction: column; gap: 30px; }
    }