/* roulang page: index */
:root {
      --deep-bg: #0A1A17;
      --card-bg: rgba(255,255,255,0.03);
      --border-light: rgba(255,255,255,0.06);
      --primary-green: #00C48C;
      --primary-green-hover: #00E6A0;
      --accent-purple: #7B2D8E;
      --text-primary: #F0F4F3;
      --text-secondary: #B0C4C1;
      --dark-surface: #051210;
      --radius-sm: 12px;
      --radius-md: 16px;
      --radius-pill: 40px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --transition-base: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      background-color: var(--deep-bg);
      color: var(--text-primary);
      font-family: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      font-weight: 400;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .inter-font {
      font-family: 'Inter', 'Noto Sans SC', sans-serif;
    }
    h1, h2, h3, .stat-number, .price-number {
      font-weight: 700;
      letter-spacing: -0.5px;
    }
    a {
      color: var(--primary-green);
      text-decoration: none;
      transition: var(--transition-base);
    }
    a:hover {
      color: var(--primary-green-hover);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .button {
      cursor: pointer;
      border: none;
      background: none;
      font-family: inherit;
    }
    input, textarea {
      font-family: inherit;
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 30px;
      padding: 14px 20px;
      color: white;
      outline: none;
      transition: var(--transition-base);
      width: 100%;
    }
    input:focus, textarea:focus {
      border-color: var(--primary-green);
      box-shadow: 0 0 0 3px rgba(0,196,140,0.2);
    }
    ::placeholder {
      color: rgba(255,255,255,0.5);
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 左侧竖向导航 (桌面) */
    .side-nav {
      position: fixed;
      left: 0;
      top: 0;
      width: 72px;
      height: 100vh;
      background: rgba(10,26,23,0.95);
      backdrop-filter: blur(14px);
      border-right: 1px solid rgba(255,255,255,0.06);
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 24px 0;
      z-index: 40;
      transition: width 0.3s ease;
      overflow: hidden;
    }
    .side-nav:hover {
      width: 240px;
    }
    .nav-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 0 20px;
      margin-bottom: 48px;
      width: 100%;
      white-space: nowrap;
    }
    .nav-logo i {
      font-size: 32px;
      color: var(--primary-green);
    }
    .nav-logo span {
      font-weight: 700;
      font-size: 18px;
      color: white;
      opacity: 0;
      transition: opacity 0.2s;
    }
    .side-nav:hover .nav-logo span {
      opacity: 1;
    }
    .nav-menu {
      display: flex;
      flex-direction: column;
      gap: 8px;
      width: 100%;
      padding: 0 20px;
      flex: 1;
    }
    .nav-item {
      display: flex;
      align-items: center;
      gap: 14px;
      padding: 12px 16px;
      border-radius: 40px;
      color: var(--text-secondary);
      transition: var(--transition-base);
      white-space: nowrap;
      font-size: 15px;
      font-weight: 400;
    }
    .nav-item i {
      font-size: 20px;
      width: 24px;
      text-align: center;
      color: inherit;
    }
    .nav-item:hover, .nav-item.active {
      background: rgba(0,196,140,0.12);
      color: var(--primary-green);
    }
    .nav-cta {
      margin-top: auto;
      padding: 0 20px;
      width: 100%;
    }
    .btn-consult {
      background: var(--primary-green);
      color: #0A1A17;
      font-weight: 700;
      border-radius: 40px;
      padding: 12px 16px;
      text-align: center;
      font-size: 14px;
      white-space: nowrap;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: var(--transition-base);
    }
    .btn-consult:hover {
      background: var(--primary-green-hover);
      box-shadow: 0 0 20px rgba(0,196,140,0.5);
      color: #0A1A17;
    }
    /* 移动端顶部导航 */
    .mobile-header {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10,26,23,0.96);
      backdrop-filter: blur(16px);
      z-index: 50;
      padding: 16px 24px;
      border-bottom: 1px solid rgba(255,255,255,0.06);
      align-items: center;
      justify-content: space-between;
    }
    .hamburger {
      color: white;
      font-size: 24px;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(10,26,23,0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      padding: 20px;
      gap: 16px;
      z-index: 45;
    }
    .mobile-menu a {
      color: var(--text-secondary);
      font-size: 18px;
      padding: 12px 0;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    /* 主内容区偏移 */
    .main-content {
      margin-left: 72px;
      transition: margin-left 0.3s;
    }
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      color: white;
    }
    .section-sub {
      color: var(--text-secondary);
      font-size: 18px;
      margin-bottom: 48px;
    }
    /* 卡片通用 */
    .glass-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-md);
      border: 1px solid rgba(255,255,255,0.06);
      padding: 32px;
      transition: var(--transition-base);
      height: 100%;
    }
    .glass-card:hover {
      border-color: var(--primary-green);
      box-shadow: var(--shadow-card);
    }
    .btn-primary {
      background: var(--primary-green);
      color: #0A1A17;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: var(--transition-base);
    }
    .btn-primary:hover {
      background: var(--primary-green-hover);
      box-shadow: 0 0 24px rgba(0,196,140,0.5);
      color: #0A1A17;
    }
    .btn-outline {
      border: 1px solid var(--primary-green);
      color: var(--primary-green);
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      transition: var(--transition-base);
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--primary-green);
      color: #0A1A17;
    }
    .purple-badge {
      background: var(--accent-purple);
      color: white;
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 600;
    }
    @media (max-width: 1024px) {
      .side-nav {
        display: none;
      }
      .mobile-header {
        display: flex;
      }
      .main-content {
        margin-left: 0;
        padding-top: 80px;
      }
      section {
        padding: 80px 0;
      }
    }
    @media (max-width: 640px) {
      .container {
        padding: 0 20px;
      }
      .section-title {
        font-size: 28px;
      }
    }