/* roulang page: index */
:root {
      --primary-cyan: #00F0FF;
      --accent-orange: #FF4D00;
      --energy-purple: #7000FF;
      --bg-deep-black: #0A0E17;
      --bg-glass: rgba(255, 255, 255, 0.03);
      --text-white: #FFFFFF;
      --text-steel: #B0C4DE;
      --text-muted: #6B7B8D;
      --border-light: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(0, 240, 255, 0.4);
      --shadow-glow: 0 0 25px rgba(0, 240, 255, 0.4);
      --shadow-elevated: 0 12px 32px rgba(0, 0, 0, 0.5);
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-xs: 8px;
      --space-section: clamp(80px, 10vw, 120px);
      --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
      --grid-max-width: 1200px;
      --glass-backdrop: blur(20px) saturate(180%);
    }

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

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

    body {
      font-family: var(--font-body);
      background: var(--bg-deep-black);
      color: var(--text-steel);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

    /* 背景光晕微纹 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(circle at 30% 40%, rgba(112, 0, 255, 0.08) 0%, transparent 35%),
                        radial-gradient(circle at 80% 20%, rgba(0, 240, 255, 0.06) 0%, transparent 40%);
      pointer-events: none;
      z-index: -1;
    }

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

    img {
      max-width: 100%;
      height: auto;
      border-radius: var(--radius-md);
      display: block;
    }

    a {
      color: var(--primary-cyan);
      text-decoration: none;
      transition: color 0.2s;
    }

    a:hover {
      color: var(--accent-orange);
    }

    /* 玻璃导航 */
    .nav-glass {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 23, 0.8);
      backdrop-filter: var(--glass-backdrop);
      -webkit-backdrop-filter: var(--glass-backdrop);
      border-bottom: 1px solid var(--border-light);
      z-index: 99;
      transition: background 0.3s;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
      max-width: var(--grid-max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-weight: 800;
      font-size: 24px;
      letter-spacing: -0.3px;
      color: var(--text-white);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo i {
      color: var(--primary-cyan);
      font-size: 28px;
    }

    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
    }

    .nav-links a {
      color: var(--text-steel);
      font-weight: 500;
      font-size: 15px;
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-cyan);
      border-bottom-color: var(--primary-cyan);
      box-shadow: 0 4px 12px rgba(0, 240, 255, 0.2);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      width: 30px;
      height: 24px;
      flex-direction: column;
      justify-content: space-between;
      cursor: pointer;
    }

    .hamburger span {
      display: block;
      height: 2px;
      background: rgba(255, 255, 255, 0.8);
      border-radius: 2px;
      transition: all 0.3s;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 70%;
      max-width: 320px;
      height: 100vh;
      background: rgba(10, 14, 23, 0.92);
      backdrop-filter: blur(40px);
      -webkit-backdrop-filter: blur(40px);
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 28px;
      transition: right 0.4s ease;
      z-index: 100;
      border-left: 1px solid #1e293b;
    }

    .mobile-menu.open {
      right: 0;
    }

    .mobile-menu a {
      color: var(--text-steel);
      font-size: 18px;
      font-weight: 500;
    }

    .close-mobile {
      align-self: flex-end;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
      cursor: pointer;
    }

    /* 板块标题 */
    .section-title {
      font-size: clamp(32px, 6vw, 42px);
      font-weight: 700;
      letter-spacing: -0.4px;
      color: var(--text-white);
      margin-bottom: 16px;
    }

    .page-cta-btn {
      display: inline-block;
      padding: 14px 34px;
      background: var(--primary-cyan);
      color: var(--bg-deep-black);
      font-weight: 700;
      border-radius: 40px;
      font-size: 16px;
      letter-spacing: -0.2px;
      border: none;
      box-shadow: var(--shadow-glow);
      transition: all 0.3s;
      text-align: center;
      cursor: pointer;
    }

    .page-cta-btn:hover {
      background: #2ef2ff;
      box-shadow: 0 0 35px rgba(0, 240, 255, 0.7);
      transform: translateY(-2px);
      color: var(--bg-deep-black);
    }

    .ghost-btn {
      background: transparent;
      border: 1px solid var(--primary-cyan);
      color: var(--primary-cyan);
      padding: 14px 34px;
      border-radius: 40px;
      font-weight: 600;
      transition: 0.2s;
      cursor: pointer;
      display: inline-block;
    }

    .ghost-btn:hover {
      background: rgba(0, 240, 255, 0.09);
    }

    /* 卡片玻璃 */
    .glass-card {
      background: rgba(18, 25, 35, 0.7);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      transition: all 0.35s ease;
    }

    .glass-card:hover {
      border-color: var(--border-glow);
      box-shadow: var(--shadow-elevated), 0 0 22px rgba(0, 240, 255, 0.2);
      transform: translateY(-4px);
    }

    /* Responsive grid helpers */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 30px;
    }

    footer {
      border-top: 1px solid #1e2a3a;
      padding: 60px 0 30px;
      margin-top: var(--space-section);
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
        gap: 24px;
      }
    }