/* roulang page: index */
:root {
      --primary: #FF3C00;
      --primary-glow: rgba(255, 60, 0, 0.5);
      --secondary: #1A0A2E;
      --accent: #00F0FF;
      --bg-dark: #0B0B0F;
      --bg-light: #16161C;
      --text-white: #FFFFFF;
      --text-gray: #B0B0C0;
      --text-muted: #6B6B7A;
      --border-subtle: rgba(255, 60, 0, 0.15);
      --border-glow: rgba(0, 240, 255, 0.5);
      --radius-card: 12px;
      --radius-btn: 6px;
      --shadow-card: 0 0 0 1px rgba(255,60,0,0.1), 0 8px 32px rgba(0,0,0,0.6);
      --font-mono: 'SF Mono', 'Fira Code', 'Inter', monospace;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      background-color: var(--bg-dark);
      color: var(--text-gray);
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .font-mono {
      font-family: var(--font-mono);
    }
    .container-main {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 导航栏 */
    .navbar {
      backdrop-filter: blur(20px);
      background: rgba(11, 11, 15, 0.75);
      transition: background 0.3s ease;
    }
    .navbar.scrolled {
      background: rgba(11, 11, 15, 0.95);
    }
    .nav-link {
      position: relative;
      font-weight: 500;
      font-size: 14px;
      color: #B0B0C0;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: #FF3C00;
    }
    .nav-link.active {
      color: #FF3C00;
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%);
      width: 4px;
      height: 4px;
      background: #FF3C00;
      border-radius: 50%;
    }
    .btn-primary {
      background: #FF3C00;
      color: white;
      border-radius: 6px;
      font-weight: 600;
      transition: all 0.25s;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #00F0FF;
      color: #0B0B0F;
      transform: scale(1.03);
      box-shadow: 0 0 15px rgba(0,240,255,0.6);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid #B0B0C0;
      color: #B0B0C0;
      border-radius: 6px;
      font-weight: 600;
      transition: all 0.25s;
      cursor: pointer;
    }
    .btn-outline:hover {
      border-color: #00F0FF;
      color: white;
      transform: scale(1.03);
    }
    /* 卡片 */
    .card-hover {
      transition: all 0.35s cubic-bezier(0.23, 1, 0.32, 1);
      background: rgba(20, 20, 30, 0.8);
      border: 1px solid rgba(255, 60, 0, 0.15);
      border-radius: 12px;
      box-shadow: 0 0 0 1px rgba(255,60,0,0.1), 0 8px 32px rgba(0,0,0,0.6);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 0 20px rgba(0,240,255,0.3), 0 12px 40px rgba(0,0,0,0.7);
      border-color: rgba(0,240,255,0.4);
    }
    .bg-placeholder-speed {
      background: linear-gradient(135deg, #1A0A2E 0%, #0B0B0F 100%);
      background-image: repeating-linear-gradient(45deg, rgba(255,60,0,0.1) 0px, rgba(255,60,0,0.1) 2px, transparent 2px, transparent 8px);
    }
    /* 粒子背景 */
    #heroCanvas {
      position: absolute;
      top:0; left:0;
      width:100%;
      height:100%;
      pointer-events: none;
    }
    .glow-text {
      color: #00F0FF;
    }
    .decor-line {
      width: 4px;
      height: 24px;
      background: #FF3C00;
      display: inline-block;
      margin-right: 12px;
      vertical-align: middle;
    }
    /* FAQ */
    .faq-item {
      border: 1px solid rgba(255,60,0,0.15);
      background: rgba(20,20,30,0.6);
      border-radius: 8px;
      transition: all 0.3s;
    }
    .faq-item.active {
      border-color: rgba(0,240,255,0.5);
      background: rgba(20,20,35,0.9);
      box-shadow: 0 0 15px rgba(0,240,255,0.15);
    }
    .faq-icon {
      transition: transform 0.3s;
      color: #00F0FF;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* 终端面板 */
    .terminal-panel {
      background: #16161C;
      border: 1px solid rgba(0,240,255,0.2);
      border-radius: 12px;
      position: relative;
    }
    .corner-tag {
      position: absolute;
      width: 12px;
      height: 12px;
      border-color: #00F0FF;
      border-style: solid;
    }
    .tag-tl { top: -1px; left: -1px; border-width: 2px 0 0 2px; }
    .tag-tr { top: -1px; right: -1px; border-width: 2px 2px 0 0; }
    .tag-bl { bottom: -1px; left: -1px; border-width: 0 0 2px 2px; }
    .tag-br { bottom: -1px; right: -1px; border-width: 0 2px 2px 0; }
    .progress-line {
      height: 2px;
      background: rgba(255,60,0,0.4);
      flex:1;
    }
    .progress-line.active {
      background: #FF3C00;
      box-shadow: 0 0 8px #FF3C00;
    }
    @media (max-width: 768px) {
      .grid-cols-2-mobile {
        grid-template-columns: 1fr;
      }
    }