/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --deep-space: #0B1D3A;
      --aurora-cyan: #00F0B5;
      --warm-orange: #FF6B35;
      --card-bg: #1E2D44;
      --text-light: #E8ECF1;
      --white: #FFFFFF;
      --glass-bg: rgba(255, 255, 255, 0.05);
      --glass-border: rgba(255, 255, 255, 0.15);
      --glass-hover-bg: rgba(255, 255, 255, 0.08);
      --shadow-default: 0 8px 32px rgba(0, 0, 0, 0.25);
      --shadow-glow: 0 0 20px rgba(0, 240, 181, 0.5);
      --shadow-glow-hover: 0 0 35px rgba(0, 240, 181, 0.7);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-full: 50%;
      --transition-basic: all 0.3s ease;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-number: 'Inter', 'SF Pro Display', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--deep-space);
      color: var(--text-light);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-basic);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: transparent;
      transition: var(--transition-basic);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
    }
    /* 导航栏 - 玻璃拟态固定顶部 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      height: 72px;
      background: rgba(11, 29, 58, 0.75);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      border-bottom: 1px solid rgba(0, 240, 181, 0.3);
      display: flex;
      align-items: center;
      padding: 0 24px;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: radial-gradient(circle at 30% 30%, var(--aurora-cyan), #0B5E4A);
      border-radius: var(--radius-full);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      color: var(--deep-space);
      box-shadow: 0 0 15px rgba(0, 240, 181, 0.6);
      font-weight: 700;
    }
    .brand-name {
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--white);
      letter-spacing: 0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      font-size: 1rem;
      font-weight: 500;
      color: var(--text-light);
      position: relative;
      padding: 6px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--aurora-cyan);
      box-shadow: 0 0 8px var(--aurora-cyan);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--aurora-cyan);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .cta-btn-nav {
      background: var(--aurora-cyan);
      color: var(--deep-space);
      padding: 10px 24px;
      border-radius: 40px;
      font-weight: 700;
      box-shadow: var(--shadow-glow);
      margin-left: 12px;
    }
    .cta-btn-nav:hover {
      box-shadow: var(--shadow-glow-hover);
      transform: translateY(-2px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      z-index: 110;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--white);
      border-radius: 4px;
      transition: 0.3s ease;
    }
    /* 移动端导航面板 */
    .mobile-panel {
      position: fixed;
      top: 0;
      right: 0;
      width: 100%;
      height: 100vh;
      background: rgba(11, 29, 58, 0.95);
      backdrop-filter: blur(35px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      transform: translateX(100%);
      transition: transform 0.4s ease;
      z-index: 105;
    }
    .mobile-panel.active {
      transform: translateX(0);
    }
    .mobile-panel a {
      font-size: 1.8rem;
      font-weight: 600;
      color: var(--white);
    }
    .close-panel {
      position: absolute;
      top: 28px;
      right: 28px;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: rgba(255,255,255,0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      color: var(--aurora-cyan);
      box-shadow: 0 0 15px rgba(0,240,181,0.4);
    }
    /* Hero 区域 */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 30%, #1A3352, var(--deep-space) 80%);
      position: relative;
      overflow: hidden;
      padding: 100px 0 60px;
    }
    .hero-bg-img {
      position: absolute;
      right: 0;
      top: 0;
      width: 55%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.25;
      mask-image: linear-gradient(to left, rgba(0,0,0,0.7), transparent);
      -webkit-mask-image: linear-gradient(to left, rgba(0,0,0,0.7), transparent);
    }
    .hero-content {
      position: relative;
      z-index: 5;
      max-width: 650px;
    }
    .hero h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--white);
      background: linear-gradient(135deg, #E0F2FE, var(--aurora-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.3rem;
      color: var(--text-light);
      margin-bottom: 32px;
      font-weight: 400;
    }
    .hero-buttons {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--aurora-cyan);
      color: var(--deep-space);
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 700;
      box-shadow: var(--shadow-glow);
    }
    .btn-primary:hover {
      box-shadow: var(--shadow-glow-hover);
      transform: translateY(-3px);
    }
    .btn-outline {
      border: 1px solid var(--aurora-cyan);
      color: var(--white);
      padding: 14px 36px;
      border-radius: 40px;
      backdrop-filter: blur(10px);
    }
    .btn-outline:hover {
      background: rgba(0,240,181,0.15);
    }
    .floating-card {
      position: absolute;
      right: 8%;
      bottom: 20%;
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--glass-border);
      border-radius: 20px;
      padding: 18px 28px;
      color: white;
      box-shadow: 0 15px 35px rgba(0,0,0,0.5);
      z-index: 4;
    }
    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--white);
    }
    .section-desc {
      color: #B0C7E0;
      margin-bottom: 48px;
      font-size: 1.1rem;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .glass-card {
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255,255,255,0.12);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      transition: 0.3s ease;
    }
    .glass-card:hover {
      transform: translateY(-8px);
      background: rgba(255,255,255,0.08);
      box-shadow: 0 15px 35px rgba(0,240,181,0.2);
    }
    .icon-circle {
      width: 60px;
      height: 60px;
      background: rgba(0,240,181,0.15);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 28px;
      color: var(--aurora-cyan);
    }
    /* 交替布局 */
    .alt-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 70px;
    }
    .alt-img {
      flex: 1;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    }
    .alt-text {
      flex: 1;
    }
    /* 定价卡 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pricing-card {
      background: rgba(255,255,255,0.03);
      border-radius: 20px;
      padding: 36px 24px;
      border: 1px solid rgba(255,255,255,0.1);
      text-align: center;
    }
    .pricing-card.featured {
      border: 2px solid var(--aurora-cyan);
      box-shadow: 0 0 35px rgba(0,240,181,0.35);
      background: rgba(0,240,181,0.06);
      transform: scale(1.02);
    }
    .price {
      font-family: var(--font-number);
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--aurora-cyan);
    }
    /* FAQ */
    .faq-item {
      background: rgba(255,255,255,0.03);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      margin-bottom: 8px;
      border-radius: 8px;
    }
    .faq-question {
      padding: 18px 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .alt-row { flex-direction: column; }
      .pricing-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 2.4rem; }
      .grid-4 { grid-template-columns: 1fr; }
    }