/* roulang page: index */
:root {
      --primary: #0A1F3F;
      --primary-light: #132D54;
      --accent: #E94E1F;
      --accent-glow: rgba(233, 78, 31, 0.5);
      --bg: #F4F6F9;
      --card-bg: rgba(255, 255, 255, 0.7);
      --card-border: rgba(255, 255, 255, 0.3);
      --text-main: #1A1A1A;
      --text-muted: #5A5A5A;
      --text-light: #FFFFFF;
      --footer-text: #B0B8C1;
      --shadow-sm: 0 8px 32px rgba(10, 31, 63, 0.08);
      --shadow-hover: 0 12px 40px rgba(10, 31, 63, 0.12);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-lg: 24px;
      --transition: 0.2s ease;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --glass-blur: blur(12px);
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all var(--transition);
    }

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

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      padding: 0 24px;
      height: 72px;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
    }

    .logo {
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .logo span {
      color: var(--accent);
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--primary);
      font-size: 1rem;
      position: relative;
      padding: 4px 0;
      white-space: nowrap;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease, left 0.25s ease;
    }

    .nav-links a:hover {
      color: var(--accent);
    }
    .nav-links a:hover::after {
      width: 100%;
      left: 0;
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--primary);
      background: none;
      border: none;
      cursor: pointer;
    }

    /* 移动端遮罩菜单 */
    .mobile-menu {
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2.5rem;
      transform: translateY(-100%);
      opacity: 0;
      transition: transform 0.35s ease, opacity 0.25s ease;
      z-index: 999;
      pointer-events: none;
    }
    .mobile-menu.active {
      transform: translateY(0);
      opacity: 1;
      pointer-events: auto;
    }
    .mobile-menu a {
      font-size: 1.6rem;
      font-weight: 600;
      color: var(--primary);
      transition: color 0.2s;
    }
    .mobile-menu a:hover {
      color: var(--accent);
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--accent);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 10px rgba(233,78,31,0.2);
      transition: all var(--transition);
      border: 2px solid transparent;
    }
    .btn-primary:hover {
      background: #D44518;
      box-shadow: 0 0 20px var(--accent-glow);
      transform: translateY(-1px);
    }
    .btn-primary:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: rgba(10,31,63,0.05);
      border-color: var(--accent);
      color: var(--accent);
    }
    .btn-outline:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }

    /* Hero双栏 */
    .hero {
      background: linear-gradient(135deg, #0A1F3F 0%, #132D54 100%);
      position: relative;
      overflow: hidden;
      min-height: 90vh;
      display: flex;
      align-items: center;
      margin-top: 72px;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: -10%;
      right: -5%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle at center, rgba(233,78,31,0.18) 0%, transparent 70%);
      border-radius: 50%;
    }
    .hero-container {
      display: flex;
      align-items: center;
      gap: 3rem;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 35%;
      position: relative;
    }
    .hero-right img {
      border-radius: var(--radius-lg);
      border: 1px solid rgba(255,255,255,0.2);
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      color: white;
      line-height: 1.2;
      margin-bottom: 1.25rem;
    }
    .hero .subtitle {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    @media (max-width: 1024px) {
      .hero-container {
        flex-direction: column;
        text-align: center;
      }
      .hero-left, .hero-right {
        flex: 1 1 100%;
      }
      .hero-right {
        max-width: 480px;
        margin: 0 auto;
      }
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2rem;
      }
    }

    /* 板块通用 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 0.75rem;
      text-align: center;
    }
    .section-subtitle {
      font-size: 1.1rem;
      color: var(--text-muted);
      text-align: center;
      margin-bottom: 3rem;
    }

    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      margin-top: 1rem;
    }
    .feature-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: all var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      width: 64px;
      height: 64px;
      background: rgba(10,31,63,0.05);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1.25rem;
      color: var(--accent);
      font-size: 2rem;
    }
    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 0.5rem;
    }
    .feature-card p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

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

    /* 案例瀑布 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
    }
    .case-card {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--accent);
    }
    .case-card img {
      height: 200px;
      object-fit: cover;
      width: 100%;
    }
    .case-content {
      padding: 1.25rem;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .case-tag {
      background: var(--accent);
      color: white;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 0.5rem;
      align-self: flex-start;
    }
    .case-card h3 {
      font-size: 1.2rem;
      font-weight: 600;
      margin: 0.5rem 0;
    }
    .case-desc {
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    @media (max-width: 1024px) {
      .cases-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 方案对比 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      align-items: start;
    }
    .plan-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      border: 1px solid transparent;
      transition: all var(--transition);
      text-align: center;
    }
    .plan-card.recommended {
      border-color: var(--accent);
      background: #FAFBFC;
      position: relative;
      box-shadow: 0 0 0 1px var(--accent);
    }
    .badge {
      background: var(--accent);
      color: white;
      font-size: 0.8rem;
      font-weight: 600;
      padding: 4px 14px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    .plan-card h3 {
      font-size: 1.6rem;
      margin-top: 1rem;
    }
    .plan-features {
      list-style: none;
      margin: 1.5rem 0;
      text-align: left;
    }
    .plan-features li {
      margin: 0.8rem 0;
      color: var(--text-muted);
    }
    .plan-features i {
      margin-right: 8px;
      color: var(--accent);
    }
    @media (max-width: 768px) {
      .pricing-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.5rem;
    }
    .faq-item {
      background: white;
      border-radius: 12px;
      padding: 1rem 1.5rem;
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
      transition: background 0.3s;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.1rem;
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
      margin-top: 0;
    }
    .faq-item.active {
      background: #F0F4FA;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 0.75rem;
    }
    .faq-item.active .faq-icon {
      color: var(--accent);
    }
    @media (max-width: 640px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    /* CTA横幅 */
    .cta-band {
      background: var(--primary);
      padding: 4rem 1.5rem;
      text-align: center;
      border-radius: 0;
      position: relative;
    }
    .cta-band h2 {
      color: white;
      font-size: 2.2rem;
    }
    .cta-band p {
      color: rgba(255,255,255,0.7);
      margin: 1rem 0 2rem;
    }
    .trust-text {
      color: #B0B8C1;
      font-size: 0.9rem;
      margin-top: 1rem;
    }

    /* 页脚 */
    .footer {
      background: var(--primary);
      color: var(--footer-text);
      padding: 3rem 0 1.5rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 2rem;
    }
    .footer h4 {
      color: white;
      margin-bottom: 1rem;
    }
    .footer a {
      color: var(--footer-text);
      display: block;
      margin: 0.5rem 0;
    }
    .footer a:hover {
      color: white;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 2rem;
      padding-top: 1.5rem;
      text-align: center;
      font-size: 0.85rem;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }