/* roulang page: index */
:root {
      --primary-purple: #7B2FF7;
      --primary-red: #F72B6B;
      --bg-deep: #0A0E1A;
      --card-bg: rgba(26, 31, 46, 0.75);
      --neon-cyan: #00F0FF;
      --text-primary: #E8ECF1;
      --text-secondary: #8892A4;
      --border-light: rgba(255, 255, 255, 0.08);
      --success-green: #00E676;
      --warning-orange: #FF9100;
      --sidebar-width: 240px;
      --radius-card: 20px;
      --radius-btn: 50px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.45);
      --transition: all 0.3s ease;
    }

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

    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .app-shell {
      display: flex;
      min-height: 100vh;
      position: relative;
    }

    /* 左侧固定导航栏 */
    .sidebar {
      position: fixed;
      top: 0;
      left: 0;
      width: var(--sidebar-width);
      height: 100vh;
      background-color: #0C1019;
      border-right: 1px solid rgba(255, 255, 255, 0.06);
      display: flex;
      flex-direction: column;
      padding: 32px 20px;
      z-index: 50;
      transition: transform 0.3s ease;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 48px;
      padding-left: 8px;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-red));
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      color: white;
      box-shadow: 0 0 14px rgba(123, 47, 247, 0.5);
    }

    .logo-text {
      font-family: 'Rajdhani', sans-serif;
      font-weight: 700;
      font-size: 24px;
      letter-spacing: 1px;
      background: linear-gradient(to right, #fff, #ddd);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-menu {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .nav-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px 16px;
      border-radius: 12px;
      font-weight: 500;
      color: var(--text-secondary);
      text-decoration: none;
      transition: var(--transition);
      position: relative;
      font-size: 15px;
    }

    .nav-item i {
      width: 20px;
      font-size: 16px;
      color: inherit;
    }

    .nav-item:hover {
      color: #fff;
      background: rgba(255, 255, 255, 0.04);
    }

    .nav-item.active {
      color: #fff;
      background: rgba(0, 240, 255, 0.08);
      box-shadow: inset 3px 0 0 var(--neon-cyan);
      font-weight: 600;
    }

    .nav-item.active i {
      color: var(--neon-cyan);
    }

    .sidebar-footer {
      margin-top: auto;
      display: flex;
      gap: 16px;
      padding-left: 8px;
      color: var(--text-secondary);
    }

    .sidebar-footer i {
      font-size: 18px;
      cursor: pointer;
      transition: color 0.2s;
    }

    .sidebar-footer i:hover {
      color: var(--neon-cyan);
    }

    /* 主内容区 */
    .main-content {
      margin-left: var(--sidebar-width);
      flex: 1;
      width: 100%;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    section {
      padding: 100px 0;
    }

    /* 移动端顶部导航 */
    .mobile-header {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(10, 14, 26, 0.9);
      backdrop-filter: blur(12px);
      z-index: 60;
      align-items: center;
      justify-content: space-between;
      padding: 0 24px;
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }

    .menu-toggle {
      font-size: 24px;
      color: white;
      background: none;
      border: none;
    }

    .mobile-logo {
      font-family: 'Rajdhani', sans-serif;
      font-weight: 700;
      font-size: 22px;
      color: white;
    }

    /* 抽屉 */
    .drawer {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: #0C1019;
      z-index: 70;
      transform: translateX(-100%);
      transition: transform 0.3s ease;
      display: flex;
      flex-direction: column;
      padding: 32px 24px;
    }

    .drawer.open {
      transform: translateX(0);
    }

    .drawer .nav-item {
      font-size: 18px;
      padding: 16px;
    }

    .close-drawer {
      align-self: flex-end;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
      margin-bottom: 32px;
    }

    /* 组件样式 */
    h1 {
      font-size: 48px;
      font-weight: 900;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }

    h2 {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }

    .section-title {
      margin-bottom: 48px;
    }
    .section-title h2 {
      padding-left: 16px;
      border-left: 4px solid var(--neon-cyan);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
      cursor: pointer;
      border: none;
      font-size: 16px;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-red));
      color: white;
      box-shadow: 0 4px 20px rgba(123, 47, 247, 0.4);
    }

    .btn-primary:hover {
      box-shadow: 0 0 28px rgba(247, 43, 107, 0.7);
      transform: scale(1.03);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--neon-cyan);
      color: var(--neon-cyan);
    }

    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
      box-shadow: 0 0 18px rgba(0, 240, 255, 0.4);
    }

    .card {
      background: var(--card-bg);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }

    .card:hover {
      transform: translateY(-8px);
      box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6), 0 0 24px rgba(0, 240, 255, 0.2);
      border-color: rgba(0, 240, 255, 0.3);
    }

    .grid-2col {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .grid-3col {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .badge {
      background: rgba(0, 240, 255, 0.15);
      color: var(--neon-cyan);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
      display: inline-block;
    }

    .stat-number {
      font-family: 'Rajdhani', sans-serif;
      font-size: 56px;
      font-weight: 700;
      line-height: 1;
    }

    input, textarea {
      background: #1A1F2E;
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 12px;
      padding: 14px 18px;
      color: white;
      width: 100%;
      font-size: 16px;
      transition: 0.2s;
    }
    input:focus, textarea:focus {
      outline: none;
      border-color: var(--neon-cyan);
      box-shadow: 0 0 12px rgba(0,240,255,0.3);
    }

    footer {
      background: #06090F;
      padding: 60px 0 30px;
    }