/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --primary-deep: #0A0E27;
      --accent-cyan: #00F0FF;
      --accent-pink: #FF3CAC;
      --success-green: #00E676;
      --text-main: #E8ECF4;
      --text-muted: #8892B0;
      --text-label: #5A6480;
      --card-bg: rgba(255, 255, 255, 0.03);
      --card-border: rgba(255, 255, 255, 0.08);
      --card-glow-border: rgba(0, 240, 255, 0.15);
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-blur: blur(20px);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-btn: 50px;
      --transition-bounce: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "Inter", "SF Mono", monospace;
    }

    body {
      background-color: var(--primary-deep);
      color: var(--text-main);
      font-family: var(--font-sans);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

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

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

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 999;
      height: 72px;
      display: flex;
      align-items: center;
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
      background: transparent;
    }

    .header.scrolled {
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      border-bottom: 1px solid var(--accent-cyan);
    }

    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
    }

    .logo .logo-cyan {
      color: var(--accent-cyan);
      text-shadow: 0 0 12px rgba(0, 240, 255, 0.7);
    }

    .logo .logo-white {
      color: white;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 2.5rem;
    }

    .nav-link {
      font-size: 1rem;
      font-weight: 500;
      color: var(--text-muted);
      position: relative;
      padding: 6px 0;
    }

    .nav-link::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      height: 2px;
      background: var(--accent-cyan);
      width: 100%;
      transition: transform 0.2s ease;
    }

    .nav-link:hover {
      color: white;
    }

    .nav-link:hover::after {
      transform: translateX(-50%) scaleX(1);
    }

    .btn-primary {
      background: linear-gradient(135deg, #00F0FF, #0088CC);
      border: none;
      color: var(--primary-deep);
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-size: 1rem;
      cursor: pointer;
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
      transition: all var(--transition-bounce);
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      transform: scale(1.05);
      background: linear-gradient(135deg, #FF3CAC, #C8226A);
      box-shadow: 0 0 35px rgba(255, 60, 172, 0.7);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }

    .hamburger span {
      width: 26px;
      height: 2px;
      background: white;
      transition: all 0.3s;
      border-radius: 2px;
    }

    .mobile-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(10, 14, 39, 0.95);
      backdrop-filter: blur(25px);
      display: none;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      z-index: 998;
    }

    .mobile-overlay.active {
      display: flex;
    }

    .mobile-menu-item {
      font-size: 2rem;
      margin: 1.2rem 0;
      color: white;
      font-weight: 600;
    }

    /* 版块通用 */
    .section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 1.5rem;
      color: var(--text-main);
      text-align: center;
    }
    .accent-line {
      width: 60px;
      height: 4px;
      background: var(--accent-cyan);
      margin: 12px auto 40px;
    }

    /* Hero 双栏 */
    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 2.5rem;
      align-items: center;
      min-height: 100vh;
      padding-top: 80px;
    }

    .hero-content h1 {
      font-size: 3.4rem;
      font-weight: 800;
      line-height: 1.2;
      background: linear-gradient(to right, #FFFFFF, #00F0FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 1.5rem;
      letter-spacing: -0.5px;
    }

    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-muted);
      margin-bottom: 2.2rem;
    }

    .btn-group {
      display: flex;
      gap: 18px;
      align-items: center;
      flex-wrap: wrap;
      margin-bottom: 2.8rem;
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(255, 255, 255, 0.25);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.2s;
    }

    .btn-ghost:hover {
      border-color: var(--accent-cyan);
      color: var(--accent-cyan);
    }

    .mini-stats {
      display: flex;
      gap: 2.5rem;
      flex-wrap: wrap;
    }
    .stat-item .stat-number {
      font-family: var(--font-mono);
      font-size: 2.4rem;
      font-weight: 900;
      color: var(--accent-cyan);
      line-height: 1;
    }
    .stat-item .stat-label {
      color: var(--text-label);
      font-size: 0.9rem;
      margin-top: 6px;
    }

    .hero-image-wrap {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.1);
      backdrop-filter: blur(10px);
      background: rgba(255,255,255,0.02);
    }

    .floating-data {
      position: absolute;
      bottom: 20px;
      left: 20px;
      background: rgba(10,14,39,0.75);
      backdrop-filter: blur(18px);
      border-radius: 12px;
      padding: 12px 18px;
      color: var(--accent-cyan);
      font-family: var(--font-mono);
      border: 1px solid var(--accent-cyan);
    }

    /* 亮点网格 */
    .grid-3-col {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.06);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: all 0.25s;
    }

    .glass-card:hover {
      transform: translateY(-6px);
      border-color: rgba(0,240,255,0.35);
      box-shadow: 0 15px 30px rgba(0,0,0,0.6);
    }

    .highlight-card h4 {
      color: white;
      font-size: 1.4rem;
      margin: 14px 0 8px;
    }

    .case-layout {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .case-card img {
      border-radius: 12px 12px 0 0;
      aspect-ratio: 16/9;
      object-fit: cover;
      width: 100%;
    }

    .case-info {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(20px);
      padding: 18px;
      border-radius: 0 0 12px 12px;
    }

    .compare-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
    }

    .compare-card.recommended {
      border-color: transparent;
      background-clip: padding-box;
      position: relative;
      border: 2px solid transparent;
      background-image: linear-gradient(145deg, #00F0FF, #FF3CAC);
      background-origin: border-box;
      background-color: rgba(10,14,39,0.6);
      box-shadow: 0 0 35px rgba(0,240,255,0.2);
    }

    .faq-list {
      max-width: 850px;
      margin: 0 auto;
    }

    .faq-item {
      border-left: 3px solid var(--accent-cyan);
      padding-left: 22px;
      margin-bottom: 22px;
      transition: 0.2s;
    }

    .faq-question {
      font-weight: 700;
      font-size: 1.2rem;
      margin-bottom: 6px;
    }

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

    @media (max-width: 992px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .grid-3-col { grid-template-columns: repeat(2,1fr); }
      .case-layout { grid-template-columns: repeat(2,1fr); }
      .compare-row { grid-template-columns: 1fr; }
    }

    @media (max-width: 767px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .grid-3-col , .case-layout , .footer-grid { grid-template-columns: 1fr; }
      .section { padding: 60px 0; }
      .hero-content h1 { font-size: 2.7rem; }
      .btn-group { flex-direction: column; align-items: flex-start; }
    }