/* roulang page: index */
:root {
      --primary-dark: #1A1A1A;
      --accent-orange: #FF6B35;
      --deep-orange: #E55A2B;
      --lemon-yellow: #FFD166;
      --bg-light: #F8F9FA;
      --bg-white: #FFFFFF;
      --gray-light: #E9ECEF;
      --text-dark: #1A1A1A;
      --text-body: #343a40;
      --text-muted: #6c757d;
      --text-white: #FFFFFF;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.1);
      --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
      --radius-card: 16px;
      --radius-btn: 8px;
      --transition: 0.3s ease;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --max-width: 1200px;
      --header-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg-white);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3 {
      color: var(--text-dark);
      font-weight: 600;
    }
    h1 {
      font-size: clamp(2rem, 5vw, 3.5rem);
      font-weight: 700;
      line-height: 1.2;
    }
    h2 {
      font-size: clamp(1.75rem, 4vw, 2.5rem);
      line-height: 1.3;
      margin-bottom: 1rem;
    }
    h3 {
      font-size: 1.35rem;
      font-weight: 600;
    }
    p {
      color: var(--text-body);
      margin-bottom: 1rem;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--bg-white);
      height: var(--header-height);
      z-index: 1000;
      transition: box-shadow 0.2s;
      box-shadow: 0 1px 0 rgba(0,0,0,0.05);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary-dark);
      letter-spacing: 1px;
    }
    .logo span {
      color: var(--accent-orange);
    }
    .main-nav {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-link {
      font-weight: 500;
      color: var(--text-dark);
      padding: 0.5rem 0;
      position: relative;
      transition: color 0.2s;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-orange);
      transition: width 0.25s ease;
    }
    .nav-link:hover {
      color: var(--accent-orange);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .mega-trigger {
      background: none;
      border: 1px solid var(--gray-light);
      padding: 0.4rem 1.2rem;
      border-radius: 2rem;
      font-weight: 500;
      color: var(--text-dark);
      display: flex;
      align-items: center;
      gap: 0.4rem;
      transition: 0.2s;
    }
    .mega-trigger:hover {
      border-color: var(--accent-orange);
      color: var(--accent-orange);
    }
    .mega-panel {
      position: absolute;
      top: calc(var(--header-height) - 4px);
      right: 0;
      width: 380px;
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-md);
      padding: 24px;
      display: none;
      flex-direction: column;
      gap: 16px;
      opacity: 0;
      transform: translateY(-8px);
      transition: opacity 0.2s, transform 0.2s;
    }
    .mega-wrapper {
      position: relative;
    }
    .mega-wrapper:hover .mega-panel,
    .mega-trigger:focus + .mega-panel,
    .mega-panel:hover {
      display: flex;
      opacity: 1;
      transform: translateY(0);
    }
    .mega-card {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px;
      border-radius: 10px;
      background: var(--bg-light);
      transition: 0.2s;
    }
    .mega-card:hover {
      border-left: 4px solid var(--accent-orange);
      background: white;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary-dark);
      border-radius: 2px;
    }
    @media (max-width: 768px) {
      .main-nav {
        display: none;
        flex-direction: column;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: white;
        padding: 24px;
        box-shadow: var(--shadow-md);
      }
      .main-nav.open {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .mega-panel {
        position: static;
        width: 100%;
        box-shadow: none;
        display: none;
      }
      .mega-wrapper:hover .mega-panel {
        display: flex;
      }
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, rgba(26,26,26,0.82) 0%, rgba(26,26,26,0.7) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: white;
      padding-top: var(--header-height);
    }
    .hero-content {
      max-width: 720px;
    }
    .hero h1 {
      color: white;
      margin-bottom: 1.25rem;
    }
    .hero .highlight {
      color: var(--accent-orange);
    }
    .hero p {
      color: rgba(255,255,255,0.85);
      font-size: 1.2rem;
      margin-bottom: 2rem;
    }
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: background 0.3s, transform 0.2s;
    }
    .btn-primary:hover {
      background: var(--deep-orange);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-orange);
      color: var(--accent-orange);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(255,107,53,0.08);
    }
    .hero-aux {
      color: rgba(255,255,255,0.9);
      margin-left: 20px;
      border-bottom: 1px dashed rgba(255,255,255,0.7);
    }
    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    /* 解决方案 */
    .solutions-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
    }
    @media (max-width: 768px) {
      .solutions-grid {
        grid-template-columns: 1fr;
      }
    }
    .solution-card {
      background: var(--bg-light);
      border-radius: var(--radius-card);
      padding: 28px;
      display: flex;
      gap: 20px;
      align-items: flex-start;
      border-left: 6px solid var(--accent-orange);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }
    .solution-icon {
      width: 56px;
      height: 56px;
      border-radius: 12px;
      background: white;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }
    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
      gap: 20px;
    }
    .step {
      text-align: center;
      flex: 1;
      position: relative;
    }
    .step-num {
      width: 48px;
      height: 48px;
      background: var(--accent-orange);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.3rem;
      margin: 0 auto 12px;
      position: relative;
      z-index: 2;
    }
    .step:nth-child(3) .step-num { background: var(--deep-orange); }
    .step:nth-child(4) .step-num { background: var(--primary-dark); }
    .step::after {
      content: '';
      position: absolute;
      top: 24px;
      left: calc(50% + 30px);
      width: calc(100% - 60px);
      height: 3px;
      background: var(--gray-light);
      z-index: 1;
    }
    .step:last-child::after {
      display: none;
    }
    @media (max-width: 768px) {
      .steps {
        flex-direction: column;
        align-items: center;
      }
      .step::after {
        display: none;
      }
    }
    /* 案例 */
    .case-card {
      display: flex;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      margin-bottom: 28px;
    }
    .case-img {
      width: 40%;
      background: #dee2e6;
    }
    .case-body {
      padding: 32px;
      width: 60%;
    }
    .case-quote {
      font-style: italic;
      color: var(--text-muted);
      border-left: 4px solid var(--accent-orange);
      padding-left: 16px;
      margin: 16px 0;
    }
    @media (max-width: 768px) {
      .case-card {
        flex-direction: column;
      }
      .case-img, .case-body {
        width: 100%;
      }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--gray-light);
      margin-bottom: 12px;
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 16px 0;
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-dark);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: var(--bg-light);
      border-radius: 8px;
      padding: 0 16px;
    }
    .faq-item.active .faq-answer {
      max-height: 220px;
      padding: 16px;
    }
    /* CTA */
    .cta-block {
      background: var(--primary-dark);
      text-align: center;
      padding: 80px 0;
    }
    .cta-block h2 {
      color: white;
    }
    .trust-badge {
      color: var(--lemon-yellow);
      font-weight: 500;
      margin-top: 12px;
    }
    /* Footer */
    .site-footer {
      background: #1A1A1A;
      color: #CCCCCC;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }