/* roulang page: index */
:root {
      --bg-deep: #0D0B1E;
      --card-bg: #1A1829;
      --card-hover-bg: #1E1C30;
      --border-subtle: #2D2A3E;
      --primary-purple: #A855F7;
      --primary-purple-light: #C084FC;
      --accent-cyan: #06B6D4;
      --accent-cyan-glow: rgba(6, 182, 212, 0.3);
      --cta-pink: #EC4899;
      --cta-pink-glow: rgba(236, 72, 153, 0.6);
      --text-white: #F5F3FF;
      --text-secondary: #A5A3B0;
      --font-sans: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --shadow-card: 0 4px 24px rgba(168, 85, 247, 0.12);
      --shadow-card-hover: 0 8px 40px rgba(168, 85, 247, 0.25);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --container-max: 1200px;
      --section-gap: 120px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-white);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

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

    button, input {
      font-family: inherit;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(13, 11, 30, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(168, 85, 247, 0.25);
      z-index: 1000;
      transition: background 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 {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-purple);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 0.5px;
    }

    .logo svg {
      width: 28px;
      height: 28px;
      fill: var(--primary-purple);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .nav-link {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-secondary);
      transition: color 0.2s, transform 0.2s;
      position: relative;
    }

    .nav-link:hover,
    .nav-link:focus-visible {
      color: var(--accent-cyan);
      outline: none;
    }

    .nav-cta {
      background: var(--primary-purple);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      transition: background 0.2s, box-shadow 0.2s;
      display: inline-block;
    }

    .nav-cta:hover {
      background: var(--primary-purple-light);
      box-shadow: 0 0 16px rgba(168, 85, 247, 0.5);
      color: white;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
      z-index: 1001;
    }

    .hamburger span {
      display: block;
      width: 26px;
      height: 2px;
      background: var(--text-white);
      border-radius: 4px;
      transition: all 0.3s ease;
      transform-origin: center;
    }

    .hamburger.active span:nth-child(1) {
      transform: translateY(8px) rotate(45deg);
    }
    .hamburger.active span:nth-child(2) {
      opacity: 0;
    }
    .hamburger.active span:nth-child(3) {
      transform: translateY(-8px) rotate(-45deg);
    }

    @media (max-width: 768px) {
      .hamburger {
        display: flex;
      }
      .nav-menu {
        position: fixed;
        top: 0;
        right: 0;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: var(--bg-deep);
        flex-direction: column;
        justify-content: center;
        gap: 32px;
        padding: 24px;
        transform: translateX(100%);
        transition: transform 0.35s ease;
        box-shadow: -8px 0 30px rgba(0,0,0,0.7);
        border-left: 1px solid var(--border-subtle);
        backdrop-filter: blur(20px);
      }
      .nav-menu.active {
        transform: translateX(0);
      }
      .nav-link {
        font-size: 1.2rem;
      }
    }

    /* 区块通用 */
    section {
      padding: var(--section-gap) 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
      :root {
        --section-gap: 80px;
      }
    }

    h2 {
      font-weight: 700;
      font-size: clamp(1.8rem, 4vw, 2.5rem);
      margin-bottom: 16px;
      letter-spacing: -0.01em;
    }

    .section-intro {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 48px;
      max-width: 700px;
    }

    /* 按钮系统 */
    .btn {
      display: inline-block;
      font-weight: 600;
      letter-spacing: 0.05em;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      text-align: center;
      min-width: 120px;
      cursor: pointer;
      border: none;
      transition: all 0.25s ease;
      font-size: 0.95rem;
    }

    .btn-primary {
      background: var(--primary-purple);
      color: white;
    }
    .btn-primary:hover {
      background: var(--primary-purple-light);
      box-shadow: 0 0 18px rgba(168,85,247,0.5);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
    }
    .btn-outline:hover {
      background: var(--accent-cyan);
      color: var(--bg-deep);
      border-color: var(--accent-cyan);
    }

    .btn-pulse {
      background: var(--cta-pink);
      color: white;
      box-shadow: 0 0 20px var(--cta-pink-glow);
      animation: pulse-glow 2s infinite;
    }
    .btn-pulse:hover {
      box-shadow: 0 0 32px var(--cta-pink), 0 0 48px rgba(236,72,153,0.4);
      background: #f0629e;
    }

    @keyframes pulse-glow {
      0% { box-shadow: 0 0 20px var(--cta-pink-glow); }
      50% { box-shadow: 0 0 35px rgba(236,72,153,0.8); }
      100% { box-shadow: 0 0 20px var(--cta-pink-glow); }
    }

    /* Hero */
    .hero {
      padding-top: 140px;
      padding-bottom: 100px;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 30% 40%, rgba(168,85,247,0.12) 0%, transparent 45%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-content h1 {
      font-weight: 800;
      font-size: clamp(2.5rem, 6vw, 4rem);
      line-height: 1.2;
      margin-bottom: 24px;
      color: white;
      letter-spacing: -0.02em;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 36px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 380px;
      border-radius: 24px;
      box-shadow: 0 0 40px rgba(168,85,247,0.25);
      position: relative;
      border: 1px solid rgba(168,85,247,0.3);
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-visual {
        min-height: 280px;
        order: -1;
      }
    }

    /* 卡片网格 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--card-bg);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      transition: all 0.25s;
      box-shadow: var(--shadow-card);
    }

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

    .feature-icon {
      font-size: 2rem;
      margin-bottom: 20px;
      color: var(--primary-purple);
    }

    .feature-card h3 {
      font-weight: 600;
      font-size: 1.25rem;
      margin-bottom: 12px;
    }

    .feature-card p {
      color: var(--text-secondary);
    }

    /* 产品分组 */
    .product-block {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      margin-bottom: 80px;
    }

    .product-desc h2 {
      margin-bottom: 20px;
    }

    .sub-cards {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }

    .sub-card {
      background: #1E1B2E;
      border: 1px solid #2D2A3E;
      border-radius: 10px;
      padding: 20px;
      transition: all 0.2s;
      text-align: center;
    }

    .sub-card:hover {
      border-color: var(--accent-cyan);
      background: #231F36;
    }

    @media (max-width: 768px) {
      .cards-grid, .sub-cards {
        grid-template-columns: 1fr;
      }
      .product-block {
        grid-template-columns: 1fr;
        gap: 32px;
      }
    }

    /* 场景 */
    .scenario-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      margin-bottom: 80px;
    }

    .scenario-img {
      background-size: cover;
      background-position: center;
      border-radius: 16px;
      min-height: 300px;
      border: 1px solid var(--border-subtle);
    }

    .scenario-text ul {
      list-style: none;
      margin-top: 20px;
    }
    .scenario-text li::before {
      content: "◆";
      color: var(--primary-purple);
      margin-right: 10px;
    }

    @media (max-width: 768px) {
      .scenario-row {
        grid-template-columns: 1fr;
      }
    }

    /* 数据指标 */
    .stats-bar {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 32px;
      margin: 48px 0;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-weight: 800;
      font-size: 2.8rem;
      color: var(--accent-cyan);
      font-feature-settings: 'tnum';
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-subtle);
      margin-bottom: 8px;
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      color: var(--text-white);
      font-weight: 600;
      font-size: 1.1rem;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      text-align: left;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      padding: 0 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }

    /* CTA */
    .cta-section {
      background: var(--card-bg);
      border-radius: 24px;
      text-align: center;
      padding: 64px 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      margin-top: 60px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }