/* roulang page: index */
:root {
      --bg-dark: #0B0E14;
      --surface-dark: #141923;
      --surface-border: #222B3D;
      --accent-neon: #00FFA3;
      --accent-indigo: #6366F1;
      --text-main: #F1F5F9;
      --text-muted: #94A3B8;
      --text-dim: #475569;
      --container-max: 1280px;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-full: 9999px;
      --glow-shadow: 0 0 25px -5px rgba(0, 255, 163, 0.2);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      background-color: var(--bg-dark);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.6;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }
    .top-bar {
      height: 38px;
      background: #06080C;
      border-bottom: 1px solid var(--surface-border);
      display: flex;
      align-items: center;
      font-size: 13px;
      color: var(--text-muted);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .dot-pulse {
      width: 8px;
      height: 8px;
      background-color: var(--accent-neon);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent-neon);
    }
    header.sticky-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(11, 14, 20, 0.88);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--surface-border);
    }
    .header-nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      font-size: 20px;
      font-weight: 800;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 10px;
      letter-spacing: -0.5px;
    }
    .brand-logo span {
      color: var(--accent-neon);
    }
    .brand-logo svg {
      width: 28px;
      height: 28px;
      fill: var(--accent-neon);
    }
    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-muted);
      font-size: 15px;
      font-weight: 500;
      position: relative;
      padding: 6px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: #fff;
    }
    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-neon);
      transition: width 0.3s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .header-actions {
      display: flex;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      min-height: 44px;
    }
    .btn-primary {
      background: var(--accent-neon);
      color: #06080C;
    }
    .btn-primary:hover {
      box-shadow: var(--glow-shadow);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border-color: var(--surface-border);
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--accent-neon);
      color: #fff;
    }
    .btn-pill {
      border-radius: var(--radius-full);
    }
    .mobile-menu-toggle {
      display: none;
      background: transparent;
      border: none;
      color: #fff;
      font-size: 24px;
      cursor: pointer;
    }
    section {
      padding: 84px 0;
      position: relative;
    }
    .section-alt {
      background-color: var(--surface-dark);
      border-top: 1px solid var(--surface-border);
      border-bottom: 1px solid var(--surface-border);
    }
    .section-header {
      margin-bottom: 48px;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 12px;
      background: rgba(99, 102, 241, 0.15);
      border: 1px solid rgba(99, 102, 241, 0.3);
      color: #A5B4FC;
      border-radius: var(--radius-full);
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 14px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: #fff;
      line-height: 1.3;
      margin-bottom: 14px;
    }
    .section-desc {
      color: var(--text-muted);
      font-size: 16px;
      max-width: 820px;
      line-height: 1.7;
    }
    /* 板块 1: Hero 斜切色块首屏 */
    .hero-section {
      padding: 100px 0 110px;
      position: relative;
      background: linear-gradient(135deg, rgba(11, 14, 20, 0.96) 20%, rgba(20, 25, 35, 0.88) 100%), url('/assets/images/fddfcd919bb13570.png') center/cover no-repeat;
      overflow: hidden;
    }
    .hero-angle-bg {
      position: absolute;
      top: -15%;
      right: -10%;
      width: 60%;
      height: 130%;
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.18), rgba(0, 255, 163, 0.08));
      transform: skewX(-16deg);
      border-left: 1px solid rgba(0, 255, 163, 0.2);
      pointer-events: none;
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
    }
    .hero-title {
      font-size: 50px;
      font-weight: 900;
      line-height: 1.15;
      color: #fff;
      margin-bottom: 24px;
      letter-spacing: -1px;
    }
    .hero-title span {
      background: linear-gradient(90deg, #FFFFFF, var(--accent-neon));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-description {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 36px;
      max-width: 780px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }
    .hero-meta-bar {
      display: flex;
      align-items: center;
      gap: 32px;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      color: var(--text-muted);
      font-size: 14px;
    }
    .hero-meta-item strong {
      color: #fff;
      font-weight: 700;
    }
    /* 通用网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .card {
      background: var(--surface-dark);
      border: 1px solid var(--surface-border);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .card:hover {
      border-color: rgba(0, 255, 163, 0.4);
      transform: translateY(-4px);
    }
    .card-thumb {
      border-radius: var(--radius-sm);
      overflow: hidden;
      margin-bottom: 20px;
      border: 1px solid rgba(255, 255, 255, 0.08);
      position: relative;
    }
    .card-thumb img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .card:hover .card-thumb img {
      transform: scale(1.05);
    }
    .card-title {
      font-size: 19px;
      font-weight: 700;
      color: #fff;
      margin-bottom: 12px;
    }
    .card-desc {
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.65;
      margin-bottom: 16px;
      flex-grow: 1;
    }
    .card-meta {
      font-size: 13px;
      color: var(--accent-neon);
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 14px;
    }
    /* 板块 2: 产品架构 */
    .overview-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .overview-card-box {
      background: rgba(20, 25, 35, 0.7);
      border: 1px solid var(--surface-border);
      border-radius: var(--radius-md);
      padding: 32px;
    }
    .metric-param-item {
      margin-bottom: 20px;
    }
    .param-label {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 6px;
    }
    .param-val {
      font-size: 24px;
      font-weight: 800;
      color: var(--accent-neon);
      font-family: monospace;
    }
    /* 板块 4: 套件对比 */
    .suite-card {
      background: #11151F;
      border: 1px solid var(--surface-border);
      border-radius: var(--radius-md);
      padding: 36px 28px;
      position: relative;
    }
    .suite-card.highlight {
      border-color: var(--accent-neon);
      box-shadow: var(--glow-shadow);
      background: #151A26;
    }
    .suite-badge {
      position: absolute;
      top: -12px;
      right: 24px;
      background: var(--accent-neon);
      color: #06080C;
      font-size: 12px;
      font-weight: 800;
      padding: 3px 12px;
      border-radius: var(--radius-full);
    }
    .suite-list {
      list-style: none;
      margin: 24px 0 32px;
    }
    .suite-list li {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .suite-list li::before {
      content: "✓";
      color: var(--accent-neon);
      font-weight: 900;
    }
    /* 板块 7: 统计带 */
    .metrics-strip {
      background: #090C12;
      border-top: 1px solid var(--surface-border);
      border-bottom: 1px solid var(--surface-border);
      padding: 48px 0;
    }
    .stat-number {
      font-size: 42px;
      font-weight: 900;
      color: var(--accent-neon);
      line-height: 1.1;
      font-family: monospace;
      margin-bottom: 8px;
    }
    .stat-label {
      color: var(--text-muted);
      font-size: 14px;
      border-left: 2px solid var(--accent-indigo);
      padding-left: 10px;
    }
    /* 板块 10: FAQ */
    .faq-container {
      max-width: 820px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--surface-dark);
      border: 1px solid var(--surface-border);
      border-radius: var(--radius-sm);
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-item summary {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 700;
      color: #fff;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-item summary::-webkit-details-marker {
      display: none;
    }
    .faq-item summary::after {
      content: "+";
      font-size: 20px;
      color: var(--accent-neon);
    }
    .faq-item[open] summary::after {
      content: "−";
    }
    .faq-item p {
      padding: 0 24px 22px;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.7;
    }
    /* 板块 12: 底部订阅转化 */
    .cta-card {
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(0, 255, 163, 0.15)), #141923;
      border: 1px solid var(--accent-neon);
      border-radius: var(--radius-md);
      padding: 56px 40px;
      text-align: center;
      box-shadow: var(--glow-shadow);
    }
    .cta-form {
      display: flex;
      max-width: 520px;
      margin: 28px auto 16px;
      gap: 10px;
    }
    .cta-input {
      flex: 1;
      height: 48px;
      background: #0B0E14;
      border: 1px solid var(--surface-border);
      border-radius: var(--radius-sm);
      padding: 0 16px;
      color: #fff;
      font-size: 14px;
    }
    .cta-input:focus {
      outline: none;
      border-color: var(--accent-neon);
    }
    /* 页脚 */
    footer.site-footer {
      background: #06080C;
      border-top: 1px solid var(--surface-border);
      padding: 64px 0 28px;
      color: var(--text-muted);
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-col-title {
      font-size: 15px;
      font-weight: 700;
      color: #fff;
      margin-bottom: 18px;
      letter-spacing: 0.5px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: var(--accent-neon);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 13px;
    }
    @media (max-width: 992px) {
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .overview-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-title {
        font-size: 38px;
      }
    }
    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .nav-links, .header-actions {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .grid-3, .grid-2, .grid-4 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-section {
        padding: 60px 0;
      }
      .hero-title {
        font-size: 30px;
      }
      .cta-form {
        flex-direction: column;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }