/* roulang page: index */
:root {
      --deep-space: #0B0E2D;
      --nebula-purple: #2A1E5C;
      --warm-star: #F4A261;
      --star-light: #f9d3b0;
      --card-bg: rgba(10, 14, 40, 0.85);
      --card-border: rgba(200, 200, 224, 0.15);
      --text-primary: #F0F0FC;
      --text-secondary: #C8C8E0;
      --text-muted: #8A8FB0;
      --radius-lg: 20px;
      --radius-pill: 50px;
      --radius-sm: 12px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.6);
      --font-heading: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-number: 'Inter', 'SF Pro Display', sans-serif;
      --max-width: 1280px;
      --section-padding: 100px;
      --grid-gap: 24px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-heading);
      background: linear-gradient(160deg, #0B0E2D 0%, #1A1245 100%);
      color: var(--text-primary);
      line-height: 1.6;
      font-size: 16px;
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
      width: 100%;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-heading);
      border: none;
      background: none;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
    }
    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 40, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(200, 200, 224, 0.15);
      padding: 16px 0;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 1px;
      color: var(--warm-star);
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: radial-gradient(circle at 30% 30%, #F4A261, #b45f2a);
      border-radius: 50%;
      box-shadow: 0 0 14px #F4A26180;
      position: relative;
    }
    .logo-icon::after {
      content: "";
      position: absolute;
      width: 14px;
      height: 2px;
      background: #0B0E2D;
      border-radius: 2px;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%) rotate(30deg);
      box-shadow: 6px -2px 0 #0B0E2D;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
      color: #C8C8E0;
      font-weight: 500;
    }
    .nav-links a:hover {
      color: var(--warm-star);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .search-icon {
      font-size: 1.2rem;
      color: #C8C8E0;
      cursor: default;
    }
    .btn-outline {
      border: 1px solid var(--warm-star);
      color: var(--warm-star);
      background: transparent;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-size: 0.9rem;
    }
    .btn-outline:hover {
      background: rgba(244, 162, 97, 0.15);
      color: #fff;
    }
    .btn-primary {
      background: var(--warm-star);
      color: #0B0E2D;
      padding: 10px 26px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      box-shadow: 0 4px 12px rgba(244,162,97,0.4);
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 6px 18px rgba(244,162,97,0.6);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: #F0F0FC;
      border-radius: 2px;
    }
    /* 区块通用 */
    section {
      padding: var(--section-padding) 0;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: #fff;
      letter-spacing: 0.5px;
    }
    .section-sub {
      color: #C8C8E0;
      margin-bottom: 48px;
      font-size: 1.1rem;
    }
    .grid-2, .grid-3, .grid-4 {
      display: grid;
      gap: var(--grid-gap);
    }
    .grid-2 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
    .card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: transform 0.25s, box-shadow 0.3s, border-color 0.2s;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(244,162,97,0.4);
    }
    .tag {
      background: rgba(244,162,97,0.15);
      color: var(--warm-star);
      padding: 4px 14px;
      border-radius: 30px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 20% 30%, #2A1E5C30, #0B0E2D);
    }
    #particle-canvas {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 20px;
    }
    .hero .sub {
      font-size: 1.4rem;
      color: #C8C8E0;
      margin-bottom: 32px;
    }
    .badge-group {
      display: flex;
      justify-content: center;
      gap: 24px;
      flex-wrap: wrap;
      margin-bottom: 36px;
    }
    .badge {
      background: rgba(10,14,40,0.7);
      border: 1px solid rgba(244,162,97,0.5);
      border-radius: 40px;
      padding: 10px 24px;
      font-weight: 600;
      backdrop-filter: blur(8px);
    }
    .badge span {
      color: var(--warm-star);
      font-size: 1.5rem;
      font-weight: 700;
      margin-right: 6px;
    }
    .cta-group {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }
    /* 特性卡片 */
    .feature-icon {
      font-size: 2.2rem;
      margin-bottom: 16px;
    }
    .feature-tags {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      margin-top: 16px;
    }
    /* 场景/案例图占位 */
    .img-placeholder {
      background: linear-gradient(135deg, #2A1E5C, #0B0E2D);
      border-radius: 16px;
      width: 100%;
      aspect-ratio: 16/9;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #8A8FB0;
      font-weight: 500;
      margin-bottom: 16px;
      background-size: cover;
      background-position: center;
    }
    .scenario-img {
      height: 140px;
      aspect-ratio: auto;
    }
    /* 价格卡高亮 */
    .pricing-highlight {
      border-color: var(--warm-star);
      box-shadow: 0 0 28px rgba(244,162,97,0.3);
      position: relative;
    }
    .pricing-highlight::before {
      content: "推荐";
      position: absolute;
      top: -12px;
      right: 24px;
      background: var(--warm-star);
      color: #0B0E2D;
      padding: 4px 18px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 700;
    }
    .price-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: #fff;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(200,200,224,0.2);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: #C8C8E0;
      margin-top: 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #2A1E5C, #0B0E2D);
      border-radius: 32px;
      padding: 64px 32px;
      text-align: center;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer-links a {
      display: block;
      color: #C8C8E0;
      margin-bottom: 8px;
    }
    .social-icons {
      display: flex;
      gap: 16px;
      font-size: 1.4rem;
    }
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 767px) {
      .container { padding: 0 20px; }
      .section-title { font-size: 1.8rem; }
      .hero h1 { font-size: 2rem; }
      .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .nav-links, .header-actions .search-icon, .header-actions .btn-outline {
        display: none;
      }
      .hamburger { display: flex; }
      .header-actions .btn-primary { padding: 8px 20px; }
      .badge-group { flex-direction: column; align-items: center; }
      .footer-grid { grid-template-columns: 1fr; }
    }