/* roulang page: index */
@import url('/assets/css/vendor/1ecd1de215-css2.css');
    :root {
      --primary: #7B2FF7;
      --primary-glow: rgba(123,47,247,0.4);
      --secondary: #00F0FF;
      --secondary-glow: rgba(0,240,255,0.4);
      --bg-dark: #0A0E17;
      --bg-light: #F5F6FA;
      --text-dark: #1A1D26;
      --text-muted-dark: #5A6072;
      --text-light: #FFFFFF;
      --text-muted-light: #B0B8CC;
      --card-dark-bg: rgba(255,255,255,0.04);
      --card-dark-border: rgba(255,255,255,0.08);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.08);
      --shadow-hover: 0 12px 24px rgba(123,47,247,0.15);
      --container-max: 1280px;
      --nav-width: 72px;
      --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-dark);
      color: var(--text-light);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      display: flex;
      min-height: 100vh;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all 0.25s ease;
    }
    /* 左侧导航 App Shell */
    .app-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: var(--nav-width);
      height: 100vh;
      background-color: #0A0E17;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 24px 0;
      z-index: 50;
      border-right: 1px solid rgba(255,255,255,0.06);
    }
    .nav-logo {
      margin-bottom: 48px;
      font-weight: 800;
      font-size: 1.25rem;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      writing-mode: vertical-rl;
      text-orientation: mixed;
      display: flex;
      align-items: center;
      justify-content: center;
      height: 100px;
    }
    .nav-logo i {
      font-size: 1.5rem;
      margin-bottom: 6px;
      background: none;
      -webkit-text-fill-color: var(--secondary);
    }
    .nav-links {
      display: flex;
      flex-direction: column;
      gap: 28px;
      align-items: center;
      flex: 1;
      justify-content: center;
    }
    .nav-item {
      width: 44px;
      height: 44px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 12px;
      color: var(--text-muted-light);
      position: relative;
      transition: all 0.2s;
    }
    .nav-item i {
      font-size: 1.4rem;
    }
    .nav-item:hover {
      color: var(--secondary);
      background: rgba(0,240,255,0.08);
    }
    .nav-item.active {
      color: var(--secondary);
      background: rgba(0,240,255,0.1);
      box-shadow: inset 2px 0 0 var(--secondary);
    }
    .mobile-menu-btn {
      display: none;
    }
    /* 主内容区 */
    .main-content {
      margin-left: var(--nav-width);
      width: 100%;
      overflow-x: hidden;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 40px;
    }
    section {
      padding: 100px 0;
    }
    /* 排版 */
    h1 {
      font-size: 3.5rem;
      font-weight: 900;
      line-height: 1.2;
      letter-spacing: -0.02em;
    }
    h2 {
      font-size: 2.25rem;
      font-weight: 700;
      letter-spacing: -0.01em;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 1.25rem;
      font-weight: 600;
    }
    .text-muted {
      color: var(--text-muted-light);
    }
    .badge-num {
      font-variant-numeric: tabular-nums;
      font-weight: 700;
      font-size: 1.5rem;
    }
    /* 卡片与组件 */
    .card {
      background: var(--card-dark-bg);
      border: 1px solid var(--card-dark-border);
      border-radius: var(--radius-lg);
      padding: 28px;
      transition: transform 0.25s, box-shadow 0.3s;
      box-shadow: var(--shadow-sm);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), #9D4EFF);
      color: white;
      border: none;
      padding: 14px 28px;
      border-radius: 12px;
      font-weight: 600;
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--secondary);
      color: var(--secondary);
      padding: 14px 28px;
      border-radius: 12px;
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
    }
    .btn-white {
      background: white;
      color: var(--primary);
      border: none;
      padding: 14px 32px;
      border-radius: 12px;
      font-weight: 700;
    }
    .btn-white-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: 12px;
      font-weight: 600;
    }
    .btn-white-outline:hover {
      background: rgba(255,255,255,0.1);
    }
    .data-badge {
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 0 12px;
    }
    .data-badge .number {
      color: var(--secondary);
      font-weight: 700;
      font-size: 1.8rem;
      font-variant-numeric: tabular-nums;
    }
    .data-badge .label {
      color: #5A6072;
      font-size: 0.85rem;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .faq-number {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: #5A6072;
      color: white;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      transition: 0.2s;
    }
    .faq-item.active .faq-number {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.2s;
      color: var(--text-muted-light);
      padding-left: 56px;
    }
    .faq-item.active .faq-answer {
      max-height: 160px;
      padding-top: 12px;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .container { padding: 0 24px; }
      h1 { font-size: 2.8rem; }
      h2 { font-size: 1.9rem; }
    }
    @media (max-width: 768px) {
      .app-nav {
        display: none;
      }
      .main-content {
        margin-left: 0;
      }
      .mobile-nav {
        display: flex;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 56px;
        background: #0A0E17;
        align-items: center;
        justify-content: space-between;
        padding: 0 20px;
        z-index: 60;
        border-bottom: 1px solid rgba(255,255,255,0.08);
      }
      .mobile-logo {
        font-weight: 800;
        background: linear-gradient(135deg, var(--primary), var(--secondary));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
      }
      .mobile-menu-btn {
        display: block;
        font-size: 1.8rem;
        color: white;
        background: none;
        border: none;
      }
      .mobile-drawer {
        position: fixed;
        top: 56px;
        left: 0;
        width: 260px;
        height: calc(100vh - 56px);
        background: #0A0E17;
        transform: translateX(-100%);
        transition: transform 0.3s;
        z-index: 55;
        padding: 32px 20px;
        display: flex;
        flex-direction: column;
        gap: 24px;
      }
      .mobile-drawer.open {
        transform: translateX(0);
      }
      .mobile-drawer a {
        color: var(--text-muted-light);
        font-size: 1.2rem;
        display: flex;
        align-items: center;
        gap: 12px;
      }
      section { padding: 60px 0; }
      h1 { font-size: 2rem; }
      h2 { font-size: 1.6rem; }
    }