/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --deep-space: #0A0E27;
      --electric-purple: #7C3AED;
      --cyan-neon: #00F0FF;
      --card-bg: rgba(15, 23, 50, 0.7);
      --card-border: rgba(0, 240, 255, 0.15);
      --text-primary: #FFFFFF;
      --text-secondary: #A0B3D9;
      --text-label: #7C3AED;
      --shadow-card: 0 8px 32px rgba(0, 240, 255, 0.08);
      --shadow-hover: 0 12px 40px rgba(124, 58, 237, 0.2);
      --radius-card: 16px;
      --radius-button: 50px;
      --radius-input: 8px;
      --radius-accordion: 12px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, -apple-system, sans-serif;
      --transition: 0.3s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-space);
      color: var(--text-secondary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      background-image: 
        linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
      background-size: 40px 40px;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, input {
      font-family: inherit;
      border: none;
      outline: none;
    }

    /* 导航栏 - 沉浸式玻璃拟态 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
      background: transparent;
      transition: background 0.4s ease, backdrop-filter 0.4s ease, box-shadow 0.4s ease;
    }

    .main-header.scrolled {
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(16px);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
      border-bottom: 1px solid rgba(0, 240, 255, 0.15);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 28px;
      font-weight: 800;
      background: linear-gradient(135deg, #FFFFFF 0%, #B3E5FF 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--cyan-neon);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M21 6H3V4h18v2zm0 4H3v2h18v-2zm0 4H3v2h18v-2zm0 4H3v2h18v-2z"/></svg>') center/contain no-repeat;
      background: var(--cyan-neon);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 15px;
      color: #d0d9f0;
      position: relative;
      padding: 8px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan-neon);
      box-shadow: 0 0 12px var(--cyan-neon);
      transition: width 0.3s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: #fff;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .mobile-toggle {
      display: none;
      background: none;
      color: white;
      font-size: 28px;
      cursor: pointer;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }

    @media (max-width: 768px) {
      .main-header {
        height: 56px;
      }
      .nav-links {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 16px;
        left: 50%;
        transform: translateX(-50%);
        background: rgba(15, 23, 50, 0.9);
        backdrop-filter: blur(20px);
        border-radius: 40px;
        padding: 8px 20px;
        gap: 20px;
        z-index: 999;
        border: 1px solid rgba(0, 240, 255, 0.3);
        box-shadow: 0 8px 24px rgba(0,0,0,0.6);
      }
      .mobile-bottom-nav a {
        color: #A0B3D9;
        font-size: 18px;
        padding: 8px;
        display: flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        border-radius: 50%;
        transition: 0.3s;
      }
      .mobile-bottom-nav a.cta-mobile {
        background: var(--cyan-neon);
        color: #0A0E27;
        font-weight: bold;
        width: auto;
        padding: 0 24px;
        border-radius: 30px;
        box-shadow: 0 0 20px var(--cyan-neon);
      }
    }

    /* Hero 双栏 */
    .hero {
      display: flex;
      align-items: center;
      min-height: 100vh;
      padding-top: 72px;
      gap: 48px;
      position: relative;
    }

    .hero-left {
      flex: 0 0 55%;
    }

    .hero-right {
      flex: 0 0 45%;
      position: relative;
      min-height: 500px;
      border-radius: var(--radius-card);
      overflow: hidden;
    }

    .hero-bg-visual {
      position: absolute;
      inset: 0;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.9;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(124,58,237,0.2) 0%, rgba(0,240,255,0.1) 100%);
      backdrop-filter: blur(4px);
    }

    .hero-graphic {
      position: relative;
      z-index: 2;
      width: 100%;
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .glow-circle {
      width: 280px;
      height: 280px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(0,240,255,0.3) 0%, transparent 70%);
      position: absolute;
      animation: pulse 2.5s infinite;
    }

    @keyframes pulse {
      0% { transform: scale(0.9); opacity: 0.6; }
      50% { transform: scale(1.1); opacity: 1; }
      100% { transform: scale(0.9); opacity: 0.6; }
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 800;
      background: linear-gradient(to right, #fff, #B3E5FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: #A0B3D9;
      margin-bottom: 32px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: rgba(0, 240, 255, 0.1);
      border: 1px solid var(--cyan-neon);
      color: var(--cyan-neon);
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      backdrop-filter: blur(10px);
      cursor: pointer;
      transition: 0.3s;
      box-shadow: 0 0 12px rgba(0,240,255,0.3);
    }

    .btn-primary:hover {
      background: var(--electric-purple);
      border-color: var(--cyan-neon);
      box-shadow: 0 0 24px rgba(0,240,255,0.7);
      color: white;
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.3);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      backdrop-filter: blur(8px);
    }

    .btn-ghost:hover {
      border-color: var(--cyan-neon);
      background: rgba(255,255,255,0.05);
    }

    /* 亮点网格 */
    .highlights {
      padding: 80px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: #fff;
      margin-bottom: 48px;
      text-align: center;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .stat-card {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 32px;
      text-align: center;
      transition: var(--transition);
    }

    .stat-card:hover {
      border-color: var(--cyan-neon);
      box-shadow: var(--shadow-hover);
    }

    .stat-number {
      font-size: 42px;
      font-weight: 800;
      color: var(--cyan-neon);
      margin-bottom: 8px;
    }

    .stat-label {
      color: var(--electric-purple);
      font-weight: 600;
      margin-bottom: 8px;
    }

    /* 案例瀑布流 */
    .cases {
      padding: 80px 0;
    }

    .masonry {
      columns: 3;
      column-gap: 24px;
    }

    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      border-radius: var(--radius-card);
      overflow: hidden;
      position: relative;
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
    }

    .case-img {
      width: 100%;
      height: auto;
      display: block;
      transition: 0.4s;
    }

    .case-info {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      padding: 24px;
      background: linear-gradient(transparent, rgba(10,14,39,0.9));
      color: white;
    }

    .case-card:hover .case-img {
      transform: scale(1.03);
    }

    /* 方案对比 */
    .compare {
      padding: 80px 0;
    }

    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .compare-col {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid var(--card-border);
    }

    .compare-col.highlight {
      border-color: var(--cyan-neon);
      box-shadow: 0 0 24px rgba(0,240,255,0.15);
    }

    /* FAQ */
    .faq {
      padding: 80px 0;
    }

    .accordion-item {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-accordion);
      margin-bottom: 16px;
      overflow: hidden;
    }

    .accordion-header {
      padding: 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: white;
      background: rgba(255,255,255,0.02);
    }

    .accordion-content {
      padding: 0 20px 20px;
      display: none;
      color: #A0B3D9;
    }

    .accordion-item.active .accordion-content {
      display: block;
    }
    .accordion-item.active {
      border-color: var(--cyan-neon);
    }

    /* CTA 横幅 */
    .cta-band {
      background: linear-gradient(135deg, rgba(124,58,237,0.2), rgba(0,240,255,0.1));
      padding: 80px 24px;
      text-align: center;
      border-top: 1px solid rgba(0,240,255,0.2);
      border-bottom: 1px solid rgba(0,240,255,0.2);
    }

    .pulse-btn {
      animation: pulse-shadow 2s infinite;
    }

    @keyframes pulse-shadow {
      0% { box-shadow: 0 0 12px rgba(0,240,255,0.6); }
      50% { box-shadow: 0 0 28px rgba(0,240,255,1); }
      100% { box-shadow: 0 0 12px rgba(0,240,255,0.6); }
    }

    /* 页脚 */
    .footer {
      background: #060B1C;
      padding: 60px 0 30px;
      color: #A0B3D9;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .hero {
        flex-direction: column;
        text-align: center;
      }
      .grid-3, .masonry {
        grid-template-columns: 1fr;
        columns: 1;
      }
      .compare-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      h1 { font-size: 36px; }
    }

    @media (max-width: 520px) {
      .btn-group {
        flex-direction: column;
        align-items: center;
      }
    }