/* roulang page: index */
:root {
      --primary-charcoal: #1A1A1A;
      --deep-bg: #0F0F0F;
      --accent-orange: #E8451E;
      --accent-orange-hover: #C03A14;
      --gray-blue: #3A4A5A;
      --light-gray-bg: #F5F5F5;
      --off-white: #FAFAFA;
      --text-dark: #2A2A2A;
      --text-mid: #4A4A4A;
      --text-light: #9A9A9A;
      --border-light: #E5E5E5;
      --white: #FFFFFF;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 24px rgba(0,0,0,0.08);
      --radius-sm: 6px;
      --radius-pill: 30px;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--off-white);
      color: var(--text-dark);
      line-height: 1.8;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航双层体系 */
    .main-header {
      background: var(--white);
      border-bottom: 1px solid var(--border-light);
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: var(--shadow-sm);
    }

    .nav-top-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 0;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      text-decoration: none;
      color: var(--primary-charcoal);
      font-weight: 700;
      font-size: 1.8rem;
      letter-spacing: 1px;
    }

    .brand-logo i {
      font-size: 2rem;
      color: var(--accent-orange);
      margin-right: 10px;
      transform: rotate(-45deg);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .search-icon {
      font-size: 1.5rem;
      color: var(--gray-blue);
      cursor: pointer;
      transition: var(--transition);
    }
    .search-icon:hover {
      color: var(--accent-orange);
    }

    .contact-btn-outline {
      border: 2px solid var(--accent-orange);
      color: var(--accent-orange);
      background: transparent;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 0.95rem;
      text-decoration: none;
      transition: var(--transition);
      white-space: nowrap;
    }
    .contact-btn-outline:hover {
      background: var(--accent-orange);
      color: var(--white);
    }

    .channel-tabs {
      background: var(--light-gray-bg);
      padding: 8px 0;
      overflow-x: auto;
      white-space: nowrap;
      scrollbar-width: thin;
      border-top: 1px solid var(--border-light);
    }

    .channel-pills {
      display: flex;
      gap: 12px;
      padding: 0 8px;
    }

    .pill-item {
      background: var(--white);
      color: var(--text-mid);
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 0.95rem;
      text-decoration: none;
      transition: var(--transition);
      border: 1px solid var(--border-light);
      display: inline-block;
    }

    .pill-item.active,
    .pill-item:hover {
      background: var(--accent-orange);
      color: var(--white);
      border-color: var(--accent-orange);
    }

    /* Hero */
    .hero-section {
      background-color: var(--deep-bg);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding: 120px 0;
      display: flex;
      align-items: center;
      overflow: hidden;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 30%, rgba(232,69,30,0.15) 0%, rgba(15,15,15,0.85) 80%);
      z-index: 1;
    }

    .speed-lines {
      position: absolute;
      inset: 0;
      background: repeating-linear-gradient(90deg, rgba(255,255,255,0.03) 0px, rgba(255,255,255,0.03) 1px, transparent 1px, transparent 4px);
      animation: moveLines 20s linear infinite;
      z-index: 0;
    }
    @keyframes moveLines {
      0% { background-position: 0 0; }
      100% { background-position: 200px 0; }
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }

    .hero-content h1 {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 1.5rem;
      line-height: 1.3;
      letter-spacing: 2px;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: #CCCCCC;
      margin-bottom: 2.5rem;
      max-width: 550px;
    }

    .btn-primary {
      background: var(--accent-orange);
      color: var(--white);
      padding: 16px 40px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      font-size: 1.1rem;
      text-decoration: none;
      display: inline-block;
      transition: var(--transition);
      border: none;
      box-shadow: 0 6px 18px rgba(232,69,30,0.3);
    }
    .btn-primary:hover {
      background: var(--accent-orange-hover);
      transform: scale(1.03);
      color: var(--white);
    }

    /* 通用板块 */
    .section {
      padding: 90px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 3.5rem;
    }
    .section-title h2 {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--primary-charcoal);
      margin-bottom: 0.75rem;
    }
    .section-title p {
      color: var(--text-mid);
      font-size: 1.1rem;
      max-width: 600px;
      margin: 0 auto;
    }

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

    .service-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      padding: 32px 28px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      align-items: flex-start;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: transparent;
    }
    .service-icon {
      font-size: 2.5rem;
      color: var(--gray-blue);
      margin-bottom: 1.5rem;
      transition: var(--transition);
    }
    .service-card:hover .service-icon {
      color: var(--accent-orange);
    }
    .service-card h3 {
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 0.8rem;
    }
    .service-desc {
      color: var(--text-mid);
      margin-bottom: 1.5rem;
    }
    .arrow-link {
      color: var(--accent-orange);
      font-weight: 600;
      text-decoration: none;
      margin-top: auto;
    }

    /* 优势数据 */
    .stats-row {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
    }
    .stat-item {
      flex: 1;
      min-width: 180px;
      margin: 20px 0;
    }
    .stat-number {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--accent-orange);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-mid);
      font-size: 1rem;
      margin-top: 8px;
    }

    /* 案例卡片 */
    .case-card {
      background: var(--white);
      border-radius: var(--radius-sm);
      overflow: hidden;
      border: 1px solid var(--border-light);
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
    }
    .case-info {
      padding: 20px;
    }
    .case-tag {
      background: #F0F0F0;
      color: var(--text-mid);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 8px;
    }

    /* 方案卡片 */
    .solution-card {
      background: var(--white);
      border-left: 5px solid var(--accent-orange);
      padding: 28px;
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
      box-shadow: var(--shadow-sm);
    }

    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 8px;
    }
    .accordion-title {
      font-weight: 700;
      padding: 18px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--primary-charcoal);
    }
    .accordion-content {
      padding-bottom: 18px;
      color: var(--text-mid);
      display: none;
    }
    .accordion-item.active .accordion-content {
      display: block;
    }
    .accordion-icon {
      font-weight: 700;
      font-size: 1.4rem;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--light-gray-bg);
      text-align: center;
      padding: 70px 20px;
    }

    /* 页脚 */
    .main-footer {
      background: var(--primary-charcoal);
      color: #B0B0B0;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 12px;
    }
    .footer-links a {
      color: #B0B0B0;
      text-decoration: none;
      display: block;
      margin-bottom: 8px;
      transition: var(--transition);
    }
    .footer-links a:hover {
      color: var(--accent-orange);
    }
    .copyright {
      border-top: 1px solid #333;
      padding-top: 20px;
      text-align: center;
      font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .hero-content h1 { font-size: 2.4rem; }
      .grid-3 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .nav-top-row { flex-wrap: wrap; }
    }
    @media (max-width: 520px) {
      .footer-grid { grid-template-columns: 1fr; }
      .stats-row { flex-direction: column; }
    }