/* roulang page: index */
/* 全局设计变量与基础重置 */
    :root {
      --primary-dark: #0A1A2F;
      --primary-deeper: #060E18;
      --accent-cyan: #00E5FF;
      --accent-red: #FF4D2E;
      --bg-light: #F4F6F9;
      --text-dark: #1A1A2E;
      --text-muted-dark: #5A6A7E;
      --text-light: #FFFFFF;
      --text-muted-light: #B0C4DE;
      --glass-bg-dark: rgba(255, 255, 255, 0.03);
      --glass-bg-light: rgba(255, 255, 255, 0.7);
      --border-dark: rgba(255, 255, 255, 0.1);
      --border-light: rgba(0, 0, 0, 0.06);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-tag: 8px;
      --shadow-dark: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-light: 0 4px 24px rgba(0, 0, 0, 0.06);
      --font-heading: 'DIN Alternate', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --max-width: 1280px;
      --nav-height: 72px;
      --section-gap: 100px;
    }

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

    body {
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.75;
      background-color: var(--bg-light);
      color: var(--text-dark);
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      line-height: 1.3;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.3s ease;
    }

    img {
      max-width: 100%;
      display: block;
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 按钮基础样式 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 16px;
      letter-spacing: 0.5px;
      transition: all 0.3s ease;
      cursor: pointer;
      border: none;
      background: transparent;
      font-family: var(--font-heading);
    }

    .btn-primary {
      background: var(--accent-cyan);
      color: var(--primary-dark);
      box-shadow: 0 0 20px rgba(0, 229, 255, 0.4);
    }

    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(0, 229, 255, 0.7);
      background: #33eaff;
      transform: translateY(-2px);
    }

    .btn-outline {
      border: 2px solid var(--accent-cyan);
      color: var(--text-light);
      background: transparent;
    }

    .btn-outline:hover {
      background: rgba(0, 229, 255, 0.1);
      border-color: #33eaff;
    }

    .btn-outline-dark {
      border: 2px solid var(--primary-dark);
      color: var(--primary-dark);
    }

    .btn-outline-dark:hover {
      background: var(--primary-dark);
      color: white;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(10, 26, 47, 0.85);
      backdrop-filter: blur(15px);
      -webkit-backdrop-filter: blur(15px);
      z-index: 1000;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      transition: background 0.3s;
    }

    .navbar.scrolled {
      background: rgba(10, 26, 47, 0.95);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: var(--font-heading);
      font-size: 24px;
      font-weight: 700;
      color: var(--accent-cyan);
      letter-spacing: 1px;
    }

    .logo i {
      font-size: 28px;
      color: var(--accent-cyan);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      color: var(--text-light);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.3s;
    }

    .nav-links a:hover {
      color: var(--accent-cyan);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-cta {
      background: var(--accent-cyan);
      color: var(--primary-dark);
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 700;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }

    .hamburger span {
      width: 25px;
      height: 2px;
      background: white;
      transition: 0.3s;
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: rgba(10, 26, 47, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        gap: 40px;
        transition: right 0.4s;
      }
      .nav-links.active {
        right: 0;
      }
      .hamburger {
        display: flex;
        z-index: 1001;
      }
    }

    /* Hero 双栏区 */
    .hero {
      background: radial-gradient(circle at 80% 20%, #0A1A2F, #060E18);
      padding: calc(var(--nav-height) + 60px) 0 80px;
      min-height: 90vh;
      display: flex;
      align-items: center;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-left {
      flex: 1.2;
    }

    .hero-right {
      flex: 1;
      position: relative;
    }

    .hero h1 {
      font-size: clamp(40px, 6vw, 60px);
      color: white;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-muted-light);
      margin-bottom: 40px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }

    .hero-badges {
      display: flex;
      gap: 24px;
      color: var(--text-muted-light);
    }

    .badge-item strong {
      color: var(--accent-cyan);
      font-size: 24px;
      display: block;
    }

    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      height: 400px;
      width: 100%;
      border: 1px solid rgba(255,255,255,0.15);
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      animation: float 6s ease-in-out infinite;
    }

    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0px); }
    }

    /* 亮点网格 */
    .features {
      padding: var(--section-gap) 0;
      background: var(--bg-light);
    }

    .section-title {
      font-size: 38px;
      margin-bottom: 16px;
      color: var(--primary-dark);
    }

    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .feature-card {
      background: var(--glass-bg-light);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: 0.3s;
      box-shadow: var(--shadow-light);
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 16px 36px rgba(0,0,0,0.1);
      border-color: var(--accent-cyan);
    }

    .feature-icon {
      font-size: 40px;
      color: var(--accent-cyan);
      margin-bottom: 20px;
    }

    /* 案例瀑布流 */
    .cases {
      padding: var(--section-gap) 0;
      background: white;
    }

    .masonry {
      columns: 3;
      column-gap: 24px;
      margin-top: 48px;
    }

    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      border-radius: 12px;
      overflow: hidden;
      background: white;
      box-shadow: 0 8px 20px rgba(0,0,0,0.06);
      transition: 0.3s;
    }

    .case-card:hover {
      transform: scale(1.02);
      box-shadow: 0 16px 32px rgba(0,0,0,0.1);
    }

    .case-img {
      height: 220px;
      background-size: cover;
      background-position: center;
    }

    .case-info {
      padding: 16px;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(10px);
    }

    .tag {
      background: var(--accent-red);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
    }

    /* 方案对比 */
    .pricing {
      padding: var(--section-gap) 0;
      background: var(--bg-light);
    }

    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .plan-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 40px 24px;
      border: 1px solid var(--border-light);
      text-align: center;
      transition: 0.3s;
    }

    .plan-card.popular {
      border: 2px solid var(--accent-cyan);
      box-shadow: 0 0 24px rgba(0,229,255,0.2);
      position: relative;
    }

    .popular-badge {
      background: var(--accent-cyan);
      color: var(--primary-dark);
      padding: 6px 20px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 14px;
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
    }

    .feature-list {
      list-style: none;
      text-align: left;
      margin: 24px 0;
    }

    .feature-list li {
      margin: 12px 0;
      color: var(--text-muted-dark);
    }

    /* FAQ */
    .faq {
      padding: var(--section-gap) 0;
    }

    .accordion {
      margin-top: 40px;
    }

    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
      cursor: pointer;
    }

    .accordion-header {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      color: var(--text-muted-dark);
    }

    .accordion-item.active .accordion-content {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA */
    .cta-section {
      background: #0A1A2F radial-gradient(circle at 50% 50%, rgba(0,229,255,0.15), transparent);
      padding: 100px 0;
      text-align: center;
      color: white;
    }

    /* 页脚 */
    .footer {
      background: #060E18;
      color: var(--text-muted-light);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .features-grid, .pricing-grid { grid-template-columns: repeat(2,1fr); }
      .masonry { columns: 2; }
      .hero-grid { flex-direction: column; }
    }

    @media (max-width: 768px) {
      .features-grid, .pricing-grid, .footer-grid { grid-template-columns: 1fr; }
      .masonry { columns: 1; }
    }