/* roulang page: index */
:root {
      --primary-deep: #1A2744;
      --accent-orange: #D4783B;
      --bg-light: #F7F9FC;
      --card-white: #FFFFFF;
      --text-body: #3A3F47;
      --text-muted: #6B7280;
      --border-light: #E5E7EB;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition-smooth: all 0.25s ease;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 5%;
      padding-right: 5%;
    }

    /* 分屏导航与Hero */
    .split-layout {
      display: flex;
      min-height: 100vh;
      background-color: #fff;
    }

    .nav-panel {
      width: 38%;
      background: white;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 2rem 3rem;
      position: relative;
      z-index: 10;
      box-shadow: 0 0 30px rgba(0,0,0,0.02);
    }

    .logo-area {
      margin-bottom: 2.5rem;
    }

    .logo-text {
      font-size: 26px;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: 1px;
      line-height: 1.2;
    }

    .logo-text small {
      display: block;
      font-size: 13px;
      font-weight: 400;
      color: var(--text-muted);
      letter-spacing: 0.5px;
      margin-top: 4px;
    }

    .nav-links {
      display: flex;
      flex-direction: column;
      gap: 18px;
      margin-top: 10px;
    }

    .nav-links a {
      font-size: 15px;
      color: var(--text-muted);
      font-weight: 500;
      padding: 6px 0 6px 12px;
      border-left: 3px solid transparent;
      transition: var(--transition-smooth);
    }

    .nav-links a:hover {
      color: var(--primary-deep);
      border-left-color: var(--accent-orange);
      background: linear-gradient(to right, rgba(26,39,68,0.02), transparent);
    }

    .hero-panel {
      width: 62%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,39,68,0.75) 0%, rgba(26,39,68,0.4) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      color: white;
      padding: 2rem;
      max-width: 600px;
    }

    .hero-content h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1rem;
      text-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }

    .hero-content p {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 2rem;
    }

    .btn-primary {
      background: var(--accent-orange);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: var(--transition-smooth);
      border: none;
      cursor: pointer;
      font-size: 16px;
    }

    .btn-primary:hover {
      background: #C0692E;
      transform: scale(1.03);
      color: white;
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      margin-left: 16px;
      transition: var(--transition-smooth);
      display: inline-block;
    }

    .btn-secondary:hover {
      background: rgba(255,255,255,0.15);
      color: white;
    }

    .section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 16px;
      line-height: 1.3;
    }

    .section-sub {
      color: var(--text-muted);
      font-size: 17px;
      margin-bottom: 48px;
    }

    /* 价值主张 */
    .value-grid {
      display: flex;
      gap: 32px;
      flex-wrap: wrap;
      align-items: center;
    }

    .value-text {
      flex: 1 1 50%;
    }

    .value-text p {
      margin-bottom: 16px;
      font-size: 17px;
    }

    .value-image {
      flex: 1 1 40%;
    }

    .value-image img {
      border-radius: 16px;
      box-shadow: var(--shadow-sm);
    }

    /* 不规则卡片网格 */
    .capabilities-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .cap-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 28px 22px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
      border-left: 4px solid transparent;
    }

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

    .cap-card.featured {
      grid-column: span 2;
      background: #fafbfc;
      border-left: 6px solid var(--accent-orange);
    }

    .cap-icon {
      font-size: 32px;
      color: var(--accent-orange);
      margin-bottom: 16px;
    }

    .cap-card h3 {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 8px;
    }

    .cap-card p {
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.6;
    }

    /* 场景图文 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
      flex-wrap: wrap;
    }

    .scenario-img {
      flex: 1 1 48%;
    }

    .scenario-img img {
      border-radius: 16px;
      box-shadow: var(--shadow-sm);
      width: 100%;
    }

    .scenario-text {
      flex: 1 1 48%;
    }

    .scenario-tag {
      background: var(--accent-orange);
      color: white;
      padding: 4px 18px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 12px;
    }

    /* 案例卡片 */
    .cases-stats {
      display: flex;
      justify-content: space-around;
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 20px;
      margin-bottom: 56px;
      box-shadow: var(--shadow-sm);
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-orange);
      line-height: 1;
    }

    .stat-label {
      color: var(--primary-deep);
      font-weight: 600;
      margin-top: 8px;
    }

    .case-cards {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .case-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      border-left: 5px solid var(--accent-orange);
    }

    .case-industry {
      color: var(--accent-orange);
      font-weight: 600;
      font-size: 14px;
      margin-bottom: 10px;
    }

    /* FAQ */
    .accordion-item {
      background: white;
      border-radius: 10px;
      margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      overflow: hidden;
    }

    .accordion-title {
      padding: 18px 24px;
      font-weight: 700;
      color: var(--primary-deep);
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #fff;
    }

    .accordion-content {
      padding: 0 24px 20px;
      color: var(--text-body);
      display: none;
    }

    .accordion-item.active .accordion-content {
      display: block;
    }

    .accordion-item.active .accordion-title {
      background: #f0f4fa;
    }

    /* CTA */
    .cta-section {
      background: #EEF2F8;
      text-align: center;
      padding: 90px 0;
    }

    .footer {
      background: var(--primary-deep);
      color: rgba(255,255,255,0.8);
      padding: 48px 0 32px;
    }

    .footer a {
      color: white;
      margin: 0 12px;
      font-size: 14px;
    }

    @media (max-width: 1024px) {
      .capabilities-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .cap-card.featured {
        grid-column: span 2;
      }
    }

    @media (max-width: 768px) {
      .split-layout {
        flex-direction: column;
      }
      .nav-panel {
        width: 100%;
        padding: 20px;
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        min-height: auto;
      }
      .nav-links {
        flex-direction: row;
        gap: 12px;
        flex-wrap: wrap;
      }
      .hero-panel {
        width: 100%;
        min-height: 70vh;
      }
      .capabilities-grid {
        grid-template-columns: 1fr;
      }
      .cap-card.featured {
        grid-column: span 1;
      }
      .case-cards {
        grid-template-columns: 1fr;
      }
    }