/* roulang page: index */
:root {
      --deep-space: #0B0A1A;
      --nebula-cyan: #2EE6D8;
      --star-gold: #F5B642;
      --card-bg: rgba(20,18,38,0.85);
      --border-glow: rgba(46,230,216,0.25);
      --border-hover: rgba(46,230,216,0.6);
      --text-soft: #CCCCCC;
      --text-dim: #888888;
      --footer-bg: #05040F;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-accordion: 10px;
      --shadow-card: 0 4px 20px rgba(46,230,216,0.08);
      --shadow-hover: 0 8px 32px rgba(46,230,216,0.25);
      --font-heading: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-mono: 'SF Mono', 'Menlo', monospace;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      background-color: var(--deep-space);
      color: #ffffff;
      font-family: var(--font-body);
      line-height: 1.7;
      font-weight: 400;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

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

    button, .button {
      cursor: pointer;
      font-family: var(--font-body);
      transition: all 0.25s ease;
    }

    h1, h2, h3 {
      font-family: var(--font-heading);
      font-weight: 700;
      margin-top: 0;
    }

    h1 {
      font-size: 3.2rem;
      line-height: 1.2;
      margin-bottom: 1.2rem;
    }

    h2 {
      font-size: 2.2rem;
      margin-bottom: 1rem;
      color: #ffffff;
    }

    h3 {
      font-size: 1.4rem;
      margin-bottom: 0.6rem;
      color: #ffffff;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部信息条 */
    .top-bar-strip {
      background: #05040F;
      height: 36px;
      line-height: 36px;
      font-size: 0.8rem;
      color: var(--nebula-cyan);
      display: flex;
      justify-content: space-between;
      padding: 0 24px;
    }

    .top-bar-strip .domain {
      color: var(--nebula-cyan);
    }

    .top-bar-strip .entry-link {
      color: var(--nebula-cyan);
      text-decoration: none;
    }

    .top-bar-strip .entry-link:hover {
      color: #ffffff;
    }

    /* 主导航 */
    .main-header {
      background: transparent;
      padding: 18px 0;
      position: relative;
      z-index: 10;
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }

    .brand {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--nebula-cyan);
      position: relative;
      display: inline-flex;
      align-items: center;
      gap: 0.3rem;
    }

    .brand::after {
      content: "";
      display: inline-block;
      width: 8px;
      height: 8px;
      background: var(--star-gold);
      border-radius: 50%;
      box-shadow: 0 0 12px var(--star-gold);
      margin-left: 6px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      flex-wrap: wrap;
    }

    .nav-links a {
      color: var(--text-soft);
      font-size: 1rem;
      font-weight: 500;
      transition: color 0.2s;
    }

    .nav-links a:hover {
      color: var(--nebula-cyan);
    }

    .btn-gold-small {
      background: var(--star-gold);
      color: #0B0A1A !important;
      padding: 8px 20px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      border: none;
      display: inline-block;
    }

    .btn-gold-small:hover {
      background: #F7C85D;
      color: #0B0A1A !important;
    }

    /* 汉堡菜单（移动端） */
    .menu-icon {
      display: none;
      font-size: 1.8rem;
      color: var(--nebula-cyan);
      cursor: pointer;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      background: var(--deep-space);
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      z-index: 0;
    }

    .stars-layer {
      position: absolute;
      width: 100%;
      height: 100%;
      background: radial-gradient(2px 2px at 20% 30%, rgba(255,255,255,0.3), transparent),
                  radial-gradient(2px 2px at 80% 70%, rgba(255,255,255,0.25), transparent),
                  radial-gradient(1px 1px at 50% 20%, #fff, transparent);
      background-size: 200px 200px;
      animation: twinkle 4s infinite alternate;
      z-index: 1;
    }

    @keyframes twinkle {
      0% { opacity: 0.4; }
      100% { opacity: 0.8; }
    }

    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 800px;
      padding: 0 20px;
    }

    .hero-content h1 {
      color: #fff;
      text-shadow: 0 0 20px rgba(46,230,216,0.5);
    }

    .hero-sub {
      font-size: 1.2rem;
      color: #ccc;
      margin-bottom: 2.5rem;
    }

    .btn-group {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--star-gold);
      color: #0B0A1A;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
      border: none;
      box-shadow: 0 4px 15px rgba(245,182,66,0.3);
    }

    .btn-primary:hover {
      background: #F7C85D;
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--nebula-cyan);
      color: var(--nebula-cyan);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
    }

    .btn-outline:hover {
      background: rgba(46,230,216,0.1);
    }

    .scroll-arrow {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      font-size: 2rem;
      color: var(--nebula-cyan);
      animation: bounce 2s infinite;
      z-index: 2;
    }

    @keyframes bounce {
      0%,100% { transform: translateX(-50%) translateY(0); }
      50% { transform: translateX(-50%) translateY(8px); }
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }

    /* 核心优势 */
    .advantage-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 30px;
    }

    .advantage-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      text-align: center;
      backdrop-filter: blur(8px);
      transition: all 0.25s;
    }

    .advantage-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .advantage-icon {
      font-size: 2.5rem;
      color: var(--nebula-cyan);
      margin-bottom: 1rem;
    }

    /* 服务卡片网格 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 28px;
    }

    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-glow);
      overflow: hidden;
      transition: all 0.3s;
      backdrop-filter: blur(8px);
    }

    .service-card:hover {
      transform: translateY(-4px);
      border-color: var(--border-hover);
      box-shadow: var(--shadow-hover);
    }

    .card-img {
      aspect-ratio: 16/9;
      background: linear-gradient(145deg, #1a1730, #0f0c24);
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .card-text {
      padding: 24px 20px;
    }

    /* 使用场景 */
    .scene-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
      flex-wrap: wrap;
    }

    .scene-img {
      flex: 1 1 45%;
      background: #141226;
      border-radius: var(--radius-card);
      overflow: hidden;
    }

    .scene-text {
      flex: 1 1 45%;
    }

    /* 成功案例 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 30px;
      text-align: center;
    }

    .stat-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 40px 20px;
    }

    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.8rem;
      color: var(--star-gold);
      font-weight: 700;
    }

    /* FAQ */
    .accordion-item {
      background: rgba(20,18,38,0.7);
      border-radius: var(--radius-accordion);
      margin-bottom: 12px;
      border: 1px solid var(--border-glow);
    }

    .accordion-title {
      background: transparent;
      color: var(--nebula-cyan);
      padding: 18px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .accordion-content {
      padding: 0 24px 20px;
      color: #ccc;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: rgba(20,18,38,0.9);
      border-radius: 20px;
      padding: 60px 30px;
      text-align: center;
      backdrop-filter: blur(12px);
    }

    /* 页脚 */
    .footer {
      background: var(--footer-bg);
      padding: 60px 0 30px;
      color: var(--text-dim);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 40px;
    }

    .footer a {
      color: #aaa;
    }

    .footer a:hover {
      color: var(--nebula-cyan);
    }

    .copyright {
      text-align: center;
      margin-top: 40px;
      font-size: 0.9rem;
      color: #666;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .service-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      h1 { font-size: 2.2rem; }
      h2 { font-size: 1.8rem; }
      .nav-links { display: none; flex-direction: column; width: 100%; background: #0B0A1A; padding: 20px; }
      .nav-links.active { display: flex; }
      .menu-icon { display: block; }
      .advantage-grid, .stats-grid { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      section { padding: 60px 0; }
      .scene-row { flex-direction: column; }
    }

    @media (max-width: 520px) {
      .footer-grid { grid-template-columns: 1fr; }
    }