/* roulang page: index */
:root {
      --primary-deep: #0A1F3F;
      --primary-light: #132B52;
      --accent-green: #00E676;
      --accent-green-dark: #00C853;
      --alert-orange: #FF3D00;
      --bg-light: #F5F7FB;
      --bg-card: #FFFFFF;
      --text-dark: #0A1F3F;
      --text-body: #2C3E50;
      --text-muted: #7F8C8D;
      --text-on-dark: #FFFFFF;
      --text-on-dark-secondary: #B0C4DE;
      --border-light: #E0E6ED;
      --shadow-card: 0 2px 12px rgba(10, 31, 63, 0.06);
      --shadow-card-hover: 0 8px 28px rgba(10, 31, 63, 0.12);
      --shadow-nav: 0 4px 20px rgba(0, 0, 0, 0.15);
      --radius-card: 4px;
      --radius-btn: 6px;
      --radius-tag: 20px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", "SF Pro Display", sans-serif;
      --transition-base: 0.2s ease-in-out;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-base);
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: none;
      outline: none;
      transition: all var(--transition-base);
      font-weight: 700;
      text-align: center;
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 31, 63, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      z-index: 1000;
      box-shadow: var(--shadow-nav);
    }

    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--accent-green);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.3px;
    }

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

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-on-dark-secondary);
      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-green);
      transition: width var(--transition-base);
    }

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

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

    .btn-nav {
      background: linear-gradient(135deg, var(--accent-green), var(--accent-green-dark));
      color: var(--primary-deep);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 14px;
      box-shadow: 0 4px 10px rgba(0, 230, 118, 0.3);
    }

    .btn-nav:hover {
      transform: scale(1.03);
      box-shadow: 0 6px 15px rgba(0, 230, 118, 0.4);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 4px;
    }

    .hamburger span {
      width: 25px;
      height: 3px;
      background: white;
      border-radius: 2px;
      transition: 0.3s;
    }

    .mobile-menu {
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: How(10, 31, 63, 0.97);
      backdrop-filter: blur(20px);
      padding: 32px 24px;
      display: none;
      flex-direction: column;
      gap: 24px;
      z-index: 999;
      list-style: none;
    }

    .mobile-menu a {
      color: white;
      font-size: 20px;
      font-weight: 600;
    }

    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: var(--bg-light);
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }

    .hero-left {
      flex: 1;
    }

    .hero-left h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--text-dark);
      margin-bottom: 24px;
    }

    .hero-left .subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.5;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 32px;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--accent-green), var(--accent-green-dark));
      color: var(--primary-deep);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-size: 16px;
      box-shadow: 0 6px 18px rgba(0, 230, 118, 0.25);
    }

    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 10px 22px rgba(0, 230, 118, 0.4);
    }

    .btn-outline {
      border: 2px solid var(--primary-deep);
      background: transparent;
      color: var(--primary-deep);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-size: 16px;
    }

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

    .trust-badges {
      display: flex;
      gap: 24px;
      color: var(--text-muted);
      font-size: 13px;
      font-weight: 500;
    }

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

    .hero-right img {
      border-radius: 12px;
      box-shadow: 0 20px 40px rgba(10,31,63,0.15);
    }

    .floating-card {
      position: absolute;
      bottom: 24px;
      right: 24px;
      background: rgba(255,255,255,0.8);
      backdrop-filter: blur(12px);
      padding: 12px 18px;
      border-radius: 12px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.1);
      font-weight: 600;
      color: var(--primary-deep);
    }

    /* 通用板块标题 */
    .section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--text-dark);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-desc {
      color: var(--text-muted);
      text-align: center;
      max-width: 640px;
      margin: 0 auto 48px;
      font-size: 16px;
    }

    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--bg-card);
      padding: 28px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      border-left: 3px solid var(--accent-green);
      transition: all var(--transition-base);
      position: relative;
    }

    .feature-card:hover {
      border-left-width: 6px;
      border-left-color: var(--accent-green);
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }

    .feature-icon {
      font-size: 36px;
      color: var(--primary-deep);
      margin-bottom: 16px;
    }

    .feature-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--text-dark);
    }

    /* 步骤条 */
    .steps-container {
      display: flex;
      align-items: flex-start;
      justify-content: space-between;
      position: relative;
    }

    .step-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      flex: 1;
      position: relative;
    }

    .step-number {
      width: 48px;
      height: 48px;
      background: linear-gradient(135deg, var(--accent-green), var(--accent-green-dark));
      color: var(--primary-deep);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 20px;
      margin-bottom: 16px;
      z-index: 2;
      box-shadow: 0 6px 15px rgba(0,230,118,0.35);
    }

    .step-line {
      position: absolute;
      top: 24px;
      left: 70%;
      width: 60%;
      height: 3px;
      background: linear-gradient(to right, var(--accent-green), var(--primary-deep));
      z-index: 1;
    }

    .step-item:last-child .step-line {
      display: none;
    }

    /* 案例瀑布流 */
    .cases-masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
    }

    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }

    .case-img {
      height: 200px;
      background-color: #E0E6ED;
    }

    .case-content {
      padding: 20px;
    }

    /* 对比表 */
    .compare-table {
      display: flex;
      gap: 24px;
      justify-content: center;
    }

    .plan-card {
      flex: 1;
      background: white;
      border-radius: 8px;
      padding: 32px;
      box-shadow: var(--shadow-card);
      position: relative;
    }

    .plan-free {
      background: #F8FAFC;
    }

    .badge-recommend {
      position: absolute;
      top: -12px;
      right: 16px;
      background: var(--alert-orange);
      color: white;
      padding: 4px 14px;
      border-radius: var(--radius-tag);
      font-weight: 600;
      font-size: 13px;
    }

    .check-green {
      color: var(--accent-green);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
      cursor: pointer;
    }

    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }

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

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }

    /* CTA 横幅 */
    .cta-band {
      background: var(--primary-deep);
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-blend-mode: overlay;
      color: white;
      padding: 80px 0;
      text-align: center;
    }

    .btn-light-outline {
      border: 2px solid var(--accent-green);
      color: var(--accent-green);
      background: transparent;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
    }

    .btn-light-outline:hover {
      background: var(--accent-green);
      color: var(--primary-deep);
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

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

    @media (max-width: 768px) {
      .nav-links, .btn-nav { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      .features-grid, .cases-masonry { grid-template-columns: 1fr; }
      .steps-container { flex-direction: column; gap: 32px; }
      .step-line { display: none; }
      .compare-table { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
      h1 { font-size: 32px !important; }
      .section-title { font-size: 26px; }
    }