/* roulang page: index */
/* ----- 设计系统变量/重置 ----- */
    :root {
      --primary-gradient: linear-gradient(135deg, #5D3FD3 -10%, #4B6EF7 90%);
      --primary-purple: #5D3FD3;
      --primary-blue: #4B6EF7;
      --accent-cyan: #00F0FF;
      --bg-deepblack: #0A0E17;
      --bg-darkpurple: #13172B;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4DE;
      --text-glow: #E0E7F2;
      --radius-pill: 50px;
      --radius-card: 24px;
      --radius-button: 8px;
      --shadow-glow-purple: 0 0 20px rgba(93, 63, 211, 0.6);
      --font-mono: 'JetBrains Mono', 'Roboto Mono', monospace;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-deepblack);
    }

    body {
      font-family: 'Inter', 'Noto Sans SC', sans-serif;
      background-color: var(--bg-deepblack);
      color: var(--text-primary);
      line-height: 1.7;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1320px;
      margin: 0 auto;
      padding: 0 40px;
    }

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

    a, button, input {
      font-family: inherit;
      text-decoration: none;
      transition: all 0.3s ease;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.16;
    }

    h1 { font-size: 56px; }
    h2 { font-size: 48px; font-weight: 700; }
    h3 { font-size: 28px; font-weight: 600; }

    /* ----- 通用按钮 ----- */
    .btn-primary {
      background: var(--primary-gradient);
      color: white;
      border: none;
      border-radius: 40px;
      padding: 14px 34px;
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      box-shadow: 0 0 22px rgba(93, 63, 211, 0.65);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 1px;
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.1);
    }
    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(0, 240, 255, 0.5), 0 10px 25px rgba(75, 110, 247, 0.5);
      transform: translateY(-3px);
    }

    .btn-ghost {
      background: transparent;
      color: var(--text-primary);
      border: 1px solid var(--primary-purple);
      border-radius: 40px;
      padding: 12px 30px;
      font-weight: 500;
      backdrop-filter: blur(10px);
      box-shadow: 0 0 12px transparent;
      display: inline-flex;
      align-items: center;
      column-gap: 8px;
    }
    .btn-ghost:hover {
      background: rgba(93, 63, 211, 0.2);
      border-color: var(--accent-cyan);
      color: var(--accent-cyan);
      box-shadow: 0 0 18px rgba(0,240,255,0.3);
    }

    /* 英文/数字等宽 */
    .mono {
      font-family: var(--font-mono);
      letter-spacing: normal;
    }

    /* ----- 导航栏 ----- */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 23, 0.65);
      backdrop-filter: blur(14px);
      z-index: 1000;
      border-bottom: 1px solid rgba(93, 63, 211, 0.25);
      transition: background 0.35s;
    }
    .navbar.scrolled {
      background: rgba(10, 14, 23, 0.92);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1320px;
      margin: 0 auto;
      padding: 0 32px;
      height: 72px;
    }
    .logo {
      font-size: 28px;
      font-weight: 800;
      background: linear-gradient(to right, #FFFFFF, #B0CADE);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: flex;
      align-items: center;
      column-gap: 8px;
    }
    .nav-links {
      display: flex;
      list-style: none;
      gap: 36px;
    }
    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      transition: 0.2s;
      padding: 8px 0;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-cyan);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-cyan);
      transition: 0.3s;
      box-shadow: 0 0 12px var(--accent-cyan);
    }
    .nav-links a:hover::after { width: 100%; }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
    }
    @media(max-width:1024px){
      .nav-links { gap: 24px; }
    }
    @media(max-width:768px){
      .nav-container { height: 64px; }
      .nav-links {
        position: fixed;
        top: 0;
        left: -100%;
        bottom: 0;
        width: 80%;
        background: rgba(8, 10, 20, 0.96);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        gap: 40px;
        transition: left 0.4s;
      }
      .nav-links.open { left: 0; }
      .mobile-toggle { display: block; z-index: 1001; }
    }

    /* ----- hero全屏 ----- */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 75% 40%, #1e1b4b22, #0A0E17 70%);
      padding-top:100px;
      position: relative;
      overflow: hidden;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 20px;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 480px;
    }
    .hero-right {
      flex: 1 1 480px;
      position: relative;
      display: flex;
      justify-content: center;
    }
    .hero-visual {
      width: 340px;
      height: 340px;
      background: radial-gradient(circle at 30% 30%, rgba(93,63,211,0.18), transparent 70%);
      border:1px solid rgba(255,255,255,0.1);
      border-radius: 36px;
      backdrop-filter: blur(30px);
      display: flex;
      align-items: center;
      justify-content: center;
      transform: perspective(700px) rotateY(8deg);
    }
    .metric-line {
      color: #ccc; margin-top: 32px;
      display: flex; gap:28px; flex-wrap: wrap;
    }
    @media(max-width:768px){
      .hero { padding: 120px 16px 60px; text-align: center; }
      .hero-left, .hero-right { flex: auto; }
      .hero-visual { width:260px; height:260px; }
    }

    /* 玻璃拟态卡片与板块 */
    section {
      padding: 100px 0;
    }
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      box-shadow: 0 20px 40px rgba(93, 63, 211, 0.15);
      transition: 0.3s;
    }
    .glass-card:hover {
      border-color: rgba(0,240,255,0.45);
      box-shadow: 0 0 35px rgba(0,240,255,0.2);
    }

    .section-title {
      margin-bottom: 56px;
    }
    .text-accent { color: var(--accent-cyan); }

    .btn-mob-full { white-space: nowrap;}

    /*FA*/
    @media(max-width:768px){
      h1{ font-size:38px; }
      h2{ font-size:32px; }
    }