/* roulang page: index */
:root {
      --primary: #7C3AED;
      --primary-glow: rgba(124, 58, 237, 0.6);
      --secondary: #06D6A0;
      --secondary-glow: rgba(6, 214, 160, 0.5);
      --bg-deep: #0F0A1A;
      --bg-section: #1A1030;
      --bg-card: rgba(255, 255, 255, 0.05);
      --border-card: rgba(124, 58, 237, 0.3);
      --text-primary: #FFFFFF;
      --text-secondary: #B0A0C0;
      --text-muted: #8A7A9A;
      --radius-lg: 24px;
      --radius-full: 50px;
      --shadow-glow: 0 0 20px rgba(124, 58, 237, 0.5);
      --shadow-teal-glow: 0 0 18px rgba(6, 214, 160, 0.45);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --container-max: 1280px;
      --gap-grid: 24px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(15, 10, 26, 0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(124, 58, 237, 0.25);
      z-index: 1000;
      transition: all 0.3s;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.6rem;
      color: white;
      letter-spacing: 0.5px;
    }
    .logo i {
      color: var(--secondary);
      font-size: 1.9rem;
      filter: drop-shadow(0 0 6px var(--secondary-glow));
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-weight: 500;
    }
    .nav-links a {
      color: var(--text-secondary);
      font-size: 1rem;
      transition: 0.2s;
    }
    .nav-links a:hover {
      color: var(--secondary);
      text-shadow: 0 0 5px var(--secondary-glow);
    }
    .btn-nav {
      background: var(--primary);
      color: white !important;
      padding: 10px 24px;
      border-radius: var(--radius-full);
      font-weight: 600;
      transition: all 0.25s;
    }
    .btn-nav:hover {
      background: var(--secondary);
      box-shadow: var(--shadow-teal-glow);
      transform: scale(1.02);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: white;
      background: none;
      border: none;
      cursor: pointer;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(10, 5, 20, 0.96);
      backdrop-filter: blur(20px);
      flex-direction: column;
      padding: 32px 24px;
      gap: 24px;
      border-bottom: 1px solid var(--border-card);
      z-index: 999;
    }
    .mobile-menu a {
      font-size: 1.2rem;
      color: var(--text-secondary);
    }
    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: radial-gradient(circle at 30% 30%, rgba(124,58,237,0.2) 0%, transparent 60%);
      position: relative;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 48px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 400px;
    }
    .hero-text h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 16px;
    }
    .gradient-text {
      background: linear-gradient(to right, #fff, var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-full);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: 0.25s;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary:hover {
      background: var(--secondary);
      box-shadow: var(--shadow-teal-glow);
      transform: scale(1.05);
    }
    .btn-outline {
      border: 1px solid var(--secondary);
      color: var(--secondary);
      padding: 14px 32px;
      border-radius: var(--radius-full);
      font-weight: 600;
      background: transparent;
      cursor: pointer;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: rgba(6,214,160,0.15);
      box-shadow: var(--shadow-teal-glow);
    }
    .hero-visual {
      flex: 1 1 400px;
      position: relative;
      display: flex;
      justify-content: center;
    }
    .floating-device {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      width: 100%;
      max-width: 450px;
      height: 350px;
      border-radius: 48px;
      box-shadow: 0 25px 50px -12px rgba(124,58,237,0.6);
      border: 1px solid var(--border-card);
      background-blend-mode: overlay;
      background-color: rgba(15,10,26,0.7);
    }
    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 600;
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 48px;
    }
    /* 优势卡片 */
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: var(--gap-grid);
    }
    .adv-card {
      background: var(--bg-card);
      border: 1px solid var(--border-card);
      border-radius: var(--radius-lg);
      padding: 28px 20px;
      transition: all 0.3s;
      text-align: center;
    }
    .adv-card:hover {
      border-color: var(--secondary);
      box-shadow: var(--shadow-glow);
    }
    .adv-icon {
      font-size: 2.5rem;
      color: var(--secondary);
      margin-bottom: 16px;
    }
    .badge-data {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-top: 16px;
    }
    .badge-item {
      background: rgba(124,58,237,0.2);
      padding: 6px 16px;
      border-radius: 32px;
      font-weight: 600;
      color: var(--secondary);
    }
    /* 功能分组 */
    .feature-split {
      display: flex;
      gap: 32px;
    }
    .feature-nav {
      display: flex;
      flex-direction: column;
      gap: 12px;
      min-width: 200px;
    }
    .feature-nav button {
      background: transparent;
      border: 1px solid var(--border-card);
      color: var(--text-secondary);
      padding: 14px 20px;
      border-radius: 18px;
      text-align: left;
      font-weight: 500;
      cursor: pointer;
      transition: 0.2s;
    }
    .feature-nav button.active {
      background: var(--primary);
      border-color: var(--primary);
      color: white;
      box-shadow: var(--shadow-glow);
    }
    .feature-detail {
      flex:1;
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 28px;
      border:1px solid var(--border-card);
    }
    /* 场景卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .scene-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border:1px solid var(--border-card);
      transition: 0.3s;
    }
    .scene-card:hover {
      border-color: var(--secondary);
      box-shadow: var(--shadow-glow);
    }
    .scene-img {
      height: 160px;
      background-size: cover;
      background-position: center;
    }
    /* 横向滚动案例 */
    .scroll-horizontal {
      display: flex;
      gap: 20px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
    }
    .case-card {
      min-width: 260px;
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 20px;
      border:1px solid var(--border-card);
    }
    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .price-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      border:1px solid var(--border-card);
      transition: 0.3s;
    }
    .price-card.featured {
      border-color: var(--primary);
      box-shadow: 0 0 30px rgba(124,58,237,0.5);
      position: relative;
    }
    .popular-badge {
      background: var(--secondary);
      color: #0F0A1A;
      padding: 4px 16px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 0.8rem;
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: var(--bg-card);
      border-radius: 18px;
      padding: 18px;
      border:1px solid var(--border-card);
      cursor: pointer;
    }
    .faq-answer {
      display: none;
      margin-top: 12px;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-band {
      background: linear-gradient(135deg, #06D6A0 0%, #7C3AED 80%);
      padding: 80px 0;
      text-align: center;
      border-radius: 0;
    }
    .trust-badges {
      display: flex;
      justify-content: center;
      gap: 32px;
      margin-top: 24px;
    }
    footer {
      background: #0A0515;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2,1fr); }
      .feature-split { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero .container { flex-direction: column; }
      .grid-3, .pricing-grid { grid-template-columns: 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }