/* roulang page: index */
:root {
      --primary-dark: #1A1A1A;
      --bg-warm: #F5F5F0;
      --accent-orange: #E94E1B;
      --accent-green: #2C6E49;
      --card-white: #FFFFFF;
      --border-light: #E8E8E0;
      --text-body: #4A4A4A;
      --text-muted: #7A7A7A;
      --font-stack: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --radius-card: 8px;
      --radius-pill: 50px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --transition-smooth: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-stack);
      background-color: var(--bg-warm);
      color: var(--text-body);
      margin: 0;
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      color: var(--primary-dark);
      letter-spacing: 0.01em;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease;
    }

    a:hover {
      color: var(--accent-orange);
      text-decoration: underline;
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 导航 */
    .site-nav {
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-light);
      position: sticky;
      top: 0;
      z-index: 40;
      height: 70px;
      display: flex;
      align-items: center;
      padding: 0 1.5rem;
    }

    .nav-logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary-dark);
      text-decoration: none;
    }

    .nav-logo i {
      font-size: 1.8rem;
      color: var(--primary-dark);
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      margin-left: auto;
      margin-right: 1.5rem;
    }

    .nav-links a {
      font-size: 0.95rem;
      color: var(--text-body);
      font-weight: 500;
      padding: 0.25rem 0;
      border-bottom: 2px solid transparent;
    }

    .nav-links a:hover {
      color: var(--accent-orange);
      border-bottom-color: var(--accent-orange);
      text-decoration: none;
    }

    .search-box {
      background: var(--bg-warm);
      border-radius: var(--radius-pill);
      padding: 0.4rem 1.2rem;
      display: flex;
      align-items: center;
      gap: 6px;
      margin-right: 1rem;
      color: var(--text-muted);
      font-size: 0.9rem;
      border: 1px solid transparent;
    }

    .btn-primary {
      background: var(--accent-orange);
      color: white;
      border-radius: var(--radius-pill);
      padding: 0.6rem 1.8rem;
      font-weight: 600;
      border: none;
      font-size: 0.9rem;
      transition: background 0.2s ease;
      white-space: nowrap;
    }

    .btn-primary:hover {
      background: #C43D13;
      color: white;
      text-decoration: none;
    }

    .btn-secondary {
      background: transparent;
      border: 1px solid var(--primary-dark);
      color: var(--primary-dark);
      border-radius: 8px;
      padding: 0.6rem 1.8rem;
      font-weight: 600;
      transition: 0.2s ease;
    }

    .btn-secondary:hover {
      background: var(--primary-dark);
      color: white;
      text-decoration: none;
    }

    .hamburger {
      display: none;
      font-size: 1.5rem;
      cursor: pointer;
      margin-left: 1rem;
    }

    /* Hero */
    #hero {
      padding: 5rem 0;
      background-color: var(--bg-warm);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 2rem;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 3.2rem;
      font-weight: 700;
      letter-spacing: 0.02em;
      margin-bottom: 1rem;
      line-height: 1.3;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 2rem;
    }

    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 12px;
      height: 380px;
      position: relative;
      overflow: hidden;
      box-shadow: 0 15px 30px rgba(0,0,0,0.1);
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(26,26,26,0.55);
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 2.5rem;
      font-weight: 300;
      letter-spacing: 4px;
    }

    .scroll-indicator {
      text-align: center;
      margin-top: 2rem;
      color: var(--text-muted);
      font-size: 1.2rem;
    }

    /* 板块通用 */
    section {
      padding: 5rem 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 650;
      margin-bottom: 1rem;
    }

    .section-intro {
      max-width: 700px;
      margin-bottom: 3rem;
      color: var(--text-body);
    }

    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
    }

    .feature-card {
      background: var(--card-white);
      padding: 1.8rem;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }

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

    .feature-icon {
      font-size: 2rem;
      color: var(--accent-green);
      margin-bottom: 1.2rem;
    }

    .feature-card h3 {
      font-size: 1.3rem;
      font-weight: 600;
    }

    /* 方案对比 */
    .solutions-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
      margin-top: 2rem;
    }

    .plan-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      padding: 2rem;
      position: relative;
      transition: var(--transition-smooth);
    }

    .plan-card.recommended {
      border-color: var(--accent-orange);
    }

    .badge {
      background: var(--accent-orange);
      color: white;
      font-size: 0.75rem;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      right: 20px;
      font-weight: 600;
    }

    .plan-features {
      list-style: none;
      padding: 0;
      margin: 1.5rem 0;
    }

    .plan-features li {
      margin-bottom: 0.8rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    /* 案例瀑布流 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
    }

    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }

    .case-img {
      position: relative;
      overflow: hidden;
      height: 200px;
    }

    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }

    .case-card:hover .case-img img {
      transform: scale(1.03);
    }

    .case-overlay {
      position: absolute;
      inset: 0;
      background: rgba(26,26,26,0.6);
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      transition: 0.3s;
      color: white;
      font-weight: 600;
    }

    .case-card:hover .case-overlay {
      opacity: 1;
    }

    .case-info {
      padding: 1.2rem;
    }

    .tag {
      background: var(--bg-warm);
      font-size: 0.75rem;
      padding: 0.2rem 0.6rem;
      border-radius: 20px;
      color: var(--text-muted);
      margin-right: 0.4rem;
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
      margin-top: 2rem;
    }

    .step {
      text-align: center;
      flex: 1;
      position: relative;
    }

    .step-circle {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: white;
      border: 2px solid var(--border-light);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.2rem;
      margin: 0 auto 0.8rem;
      color: var(--primary-dark);
    }

    .step.active .step-circle {
      background: var(--accent-orange);
      border-color: var(--accent-orange);
      color: white;
    }

    .step-line {
      position: absolute;
      top: 25px;
      left: 65%;
      width: 70%;
      height: 2px;
      background: var(--border-light);
      z-index: -1;
    }

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

    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 0.5rem;
    }

    .accordion-title {
      padding: 1rem 0;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--primary-dark);
      font-size: 1.1rem;
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
    }

    .accordion-item.active .accordion-content {
      max-height: 200px;
      padding-bottom: 1rem;
    }

    .arrow {
      transition: transform 0.3s;
    }

    .accordion-item.active .arrow {
      transform: rotate(180deg);
    }

    /* CTA深色 */
    .dark-cta {
      background: var(--primary-dark);
      color: white;
      text-align: center;
      padding: 4rem 0;
      border-radius: 0;
    }

    .dark-cta h2 {
      color: white;
    }

    .email-form {
      display: flex;
      justify-content: center;
      gap: 0.8rem;
      margin-top: 2rem;
      flex-wrap: wrap;
    }

    .email-input {
      border-radius: var(--radius-pill);
      padding: 0.8rem 1.5rem;
      border: none;
      width: 300px;
      max-width: 90%;
    }

    /* 页脚 */
    .footer {
      background: #1A1A1A;
      color: #B0B0B0;
      padding: 3rem 0 1rem;
    }

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

    .copyright {
      background: #111111;
      color: #7A7A7A;
      text-align: center;
      padding: 1rem;
      font-size: 0.85rem;
      margin-top: 2rem;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .features-grid, .cases-grid {
        grid-template-columns: 1fr 1fr;
      }
      .nav-links, .search-box {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 640px) {
      .features-grid, .cases-grid, .solutions-row {
        grid-template-columns: 1fr;
      }
      .process-steps {
        flex-direction: column;
        gap: 1.5rem;
      }
      .step-line {
        display: none;
      }
    }