/* roulang page: index */
:root {
      --primary: #1B172E;
      --primary-dark: #0E0C1A;
      --accent: #00F298;
      --accent-hover: #00d685;
      --secondary: #635BFF;
      --secondary-dark: #4d44db;
      --bg-light: #F7F8FA;
      --bg-white: #FFFFFF;
      --text-main: #0A0914;
      --text-body: #3A3947;
      --text-muted: #787785;
      --border-color: rgba(27, 23, 46, 0.08);
      --radius: 12px;
      --shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 10px 30px rgba(99, 91, 255, 0.12);
      --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      --container-max: 1240px;
    }
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, select, textarea {
      font-family: inherit;
      font-size: 1rem;
      border: none;
      outline: none;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }
    .top-bar {
      background: var(--primary-dark);
      color: #9f9da8;
      font-size: 0.85rem;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 10px;
    }
    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: #e2e1e8;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent);
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.4; transform: scale(0.85); }
    }
    .header-main {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      position: sticky;
      top: 0;
      z-index: 1000;
      border-bottom: 1px solid var(--border-color);
    }
    .header-nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--secondary), var(--accent));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 900;
      font-size: 1.1rem;
    }
    .nav-menu {
      display: flex;
      list-style: none;
      gap: 28px;
    }
    .nav-item a {
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 0;
      position: relative;
    }
    .nav-item a:hover {
      color: var(--secondary);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 26px;
      border-radius: 8px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--secondary), #4b42e6);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(99, 91, 255, 0.35);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(99, 91, 255, 0.45);
    }
    .btn-accent {
      background: var(--accent);
      color: var(--primary-dark);
      font-weight: 700;
      box-shadow: 0 4px 14px rgba(0, 242, 152, 0.3);
    }
    .btn-accent:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      border: 1px solid rgba(255, 255, 255, 0.2);
      color: #ffffff;
      background: rgba(255, 255, 255, 0.05);
    }
    .btn-outline:hover {
      background: rgba(255, 255, 255, 0.15);
      border-color: #ffffff;
    }
    .hero-section {
      position: relative;
      background-color: var(--primary-dark);
      background-image: linear-gradient(180deg, rgba(14, 12, 26, 0.85) 0%, rgba(14, 12, 26, 0.95) 100%), url('/assets/images/e727f1a4c4e16912.webp');
      background-size: cover;
      background-position: center;
      color: #ffffff;
      padding: 90px 0 110px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 50px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 2.8rem;
      line-height: 1.25;
      font-weight: 800;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }
    .hero-content h1 span {
      background: linear-gradient(90deg, #ffffff, var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.1rem;
      color: #b3b1c2;
      margin-bottom: 35px;
      max-width: 600px;
      line-height: 1.8;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }
    .hero-card {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius);
      padding: 30px;
      backdrop-filter: blur(10px);
    }
    .invite-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 15px;
    }
    .invite-badge {
      background: rgba(0, 242, 152, 0.15);
      color: var(--accent);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
    }
    .progress-bar-wrap {
      background: rgba(255, 255, 255, 0.1);
      height: 10px;
      border-radius: 5px;
      overflow: hidden;
      margin: 15px 0 25px;
    }
    .progress-bar-fill {
      width: 78%;
      height: 100%;
      background: linear-gradient(90deg, var(--secondary), var(--accent));
      border-radius: 5px;
    }
    .section-title-wrap {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 55px;
    }
    .section-tag {
      display: inline-block;
      color: var(--secondary);
      font-weight: 700;
      font-size: 0.9rem;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 2.2rem;
      color: var(--text-main);
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 16px;
    }
    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.05rem;
      line-height: 1.7;
    }
    .section-pad {
      padding: 90px 0;
    }
    .bg-white-area {
      background-color: var(--bg-white);
    }
    .tier-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .tier-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 35px 30px;
      transition: var(--transition);
      position: relative;
    }
    .tier-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: var(--secondary);
    }
    .tier-card.featured {
      background: #fafaff;
      border: 2px solid var(--secondary);
    }
    .tier-badge-top {
      position: absolute;
      top: -14px;
      right: 25px;
      background: var(--secondary);
      color: #fff;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
    }
    .tier-price {
      font-size: 2.4rem;
      font-weight: 800;
      color: var(--text-main);
      margin: 15px 0 20px;
    }
    .tier-price span {
      font-size: 1rem;
      color: var(--text-muted);
      font-weight: 400;
    }
    .tier-features {
      list-style: none;
      margin: 25px 0 35px;
    }
    .tier-features li {
      padding: 8px 0;
      color: var(--text-body);
      font-size: 0.95rem;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .tier-features li::before {
      content: "✓";
      color: var(--accent-hover);
      font-weight: 900;
    }
    .spec-table-wrap {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow-x: auto;
      box-shadow: var(--shadow);
    }
    .spec-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .spec-table th, .spec-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
    }
    .spec-table th {
      background: #fbfbfd;
      color: var(--text-main);
      font-weight: 700;
    }
    .spec-table tr:hover td {
      background: #f8f8fc;
    }
    .flash-box {
      background: linear-gradient(135deg, #2b1f4d 0%, #15102a 100%);
      border-radius: var(--radius);
      padding: 45px;
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 30px;
      border: 1px solid rgba(255, 255, 255, 0.1);
    }
    .flash-time {
      display: flex;
      gap: 15px;
      margin-top: 15px;
    }
    .time-block {
      background: rgba(255, 255, 255, 0.1);
      padding: 8px 16px;
      border-radius: 6px;
      font-size: 1.3rem;
      font-weight: 800;
      color: var(--accent);
    }
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .solution-card {
      background: var(--bg-white);
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      transition: var(--transition);
    }
    .solution-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .solution-img-wrap {
      height: 200px;
      overflow: hidden;
      background: #eceaf3;
    }
    .solution-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .solution-card:hover .solution-img-wrap img {
      transform: scale(1.05);
    }
    .solution-body {
      padding: 25px;
    }
    .solution-title {
      font-size: 1.25rem;
      color: var(--text-main);
      font-weight: 700;
      margin-bottom: 12px;
    }
    .dark-infra-section {
      background-color: var(--primary-dark);
      background-image: linear-gradient(180deg, rgba(14, 12, 26, 0.95) 0%, rgba(14, 12, 26, 0.98) 100%), url('/assets/images/c85f724e5bbda142.webp');
      background-size: cover;
      color: #ffffff;
      padding: 95px 0;
    }
    .dark-infra-section .section-title {
      color: #ffffff;
    }
    .dark-infra-section .section-subtitle {
      color: #a4a2b3;
    }
    .infra-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 25px;
    }
    .infra-card {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius);
      padding: 30px 25px;
      backdrop-filter: blur(8px);
    }
    .infra-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 10px;
    }
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .case-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      display: flex;
    }
    .case-img {
      width: 42%;
      background: #ddd;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-content {
      width: 58%;
      padding: 30px;
    }
    .case-metric {
      display: flex;
      gap: 20px;
      margin-top: 20px;
      padding-top: 20px;
      border-top: 1px solid var(--border-color);
    }
    .case-metric-item b {
      display: block;
      font-size: 1.4rem;
      color: var(--secondary);
    }
    .case-metric-item span {
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .testi-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      position: relative;
    }
    .testi-author {
      display: flex;
      align-items: center;
      gap: 15px;
      margin-top: 25px;
    }
    .testi-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #eee;
      overflow: hidden;
    }
    .testi-avatar img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .guarantee-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 35px 25px;
    }
    .guarantee-item {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .guarantee-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: rgba(99, 91, 255, 0.08);
      color: var(--secondary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: 900;
      flex-shrink: 0;
    }
    .guarantee-text h4 {
      font-size: 1.05rem;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .guarantee-text p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .news-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 25px;
      transition: var(--transition);
    }
    .news-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .news-date {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 10px;
    }
    .news-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.5;
    }
    .faq-wrap {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-question::after {
      content: "+";
      font-size: 1.3rem;
      color: var(--secondary);
      transition: var(--transition);
    }
    .faq-item.active .faq-question::after {
      content: "-";
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-body);
      font-size: 0.95rem;
      display: none;
      border-top: 1px dashed var(--border-color);
      padding-top: 15px;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .cta-form-card {
      background: linear-gradient(135deg, #1b172e 0%, #292445 100%);
      border-radius: 16px;
      padding: 50px;
      color: #ffffff;
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2);
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-group label {
      display: block;
      margin-bottom: 8px;
      font-size: 0.9rem;
      color: #ccc;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: 6px;
      color: #fff;
      box-sizing: border-box;
    }
    .form-control:focus {
      border-color: var(--accent);
      background: rgba(255, 255, 255, 0.12);
    }
    .site-footer {
      background: #0d0b17;
      color: #8c899c;
      padding: 70px 0 30px;
      font-size: 0.95rem;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1.1rem;
      margin-bottom: 20px;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col ul li {
      margin-bottom: 12px;
    }
    .footer-col ul li a:hover {
      color: var(--accent);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 25px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 15px;
      font-size: 0.85rem;
    }
    .mobile-sticky-cta {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: #1b172e;
      border-top: 1px solid rgba(255, 255, 255, 0.15);
      padding: 10px 16px;
      z-index: 9999;
      box-shadow: 0 -4px 15px rgba(0,0,0,0.3);
    }
    .mobile-cta-inner {
      display: flex;
      gap: 10px;
    }
    .mobile-cta-inner .btn {
      flex: 1;
      padding: 10px;
      font-size: 0.9rem;
    }
    @media (max-width: 1024px) {
      .hero-grid, .form-grid {
        grid-template-columns: 1fr;
      }
      .tier-grid, .solutions-grid, .testimonial-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .infra-grid, .guarantee-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .hero-content h1 {
        font-size: 2rem;
      }
      .tier-grid, .solutions-grid, .testimonial-grid, .news-grid, .cases-grid {
        grid-template-columns: 1fr;
      }
      .case-card {
        flex-direction: column;
      }
      .case-img, .case-content {
        width: 100%;
      }
      .infra-grid, .guarantee-bar {
        grid-template-columns: 1fr;
      }
      .flash-box {
        flex-direction: column;
        text-align: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .mobile-sticky-cta {
        display: block;
      }
      body {
        padding-bottom: 60px;
      }
    }