/* roulang page: index */
:root {
      --brand-red: #E8452D;
      --brand-dark: #1A1A2E;
      --brand-gold: #FFB800;
      --gray-bg: #F5F5F7;
      --text-main: #2D2D2D;
      --text-muted: #6B6B6B;
      --border-light: #e0e0e0;
      --card-shadow: 0 4px 14px rgba(0,0,0,0.06);
      --card-hover-shadow: 0 12px 28px rgba(0,0,0,0.10);
      --radius-lg: 18px;
      --radius-md: 10px;
      --radius-sm: 8px;
      --radius-pill: 24px;
      --transition-smooth: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background: #ffffff;
      color: var(--text-main);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      scroll-behavior: smooth;
    }

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

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

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

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      z-index: 40;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      transition: var(--transition-smooth);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-size: 26px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--brand-dark);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo i {
      color: var(--brand-red);
      font-size: 28px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
      margin: 0;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 0;
      position: relative;
      transition: color 0.2s;
    }

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

    .nav-links a:hover {
      color: var(--brand-red);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--brand-red);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      display: inline-block;
      transition: background 0.2s, transform 0.1s;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 10px rgba(232,69,45,0.2);
    }

    .btn-primary:hover {
      background: #c0392b;
      color: white;
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--brand-red);
      color: var(--brand-red);
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      display: inline-block;
      transition: all 0.25s;
    }

    .btn-outline:hover {
      background: var(--brand-red);
      color: white;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--text-main);
      cursor: pointer;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(26,26,46,0.97);
      backdrop-filter: blur(10px);
      z-index: 100;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
    }

    .mobile-menu.active {
      display: flex;
    }

    .mobile-menu a {
      color: white;
      font-size: 26px;
      font-weight: 600;
    }

    .close-menu {
      position: absolute;
      top: 24px;
      right: 28px;
      background: none;
      border: none;
      color: white;
      font-size: 36px;
      cursor: pointer;
    }

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

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #E8452D 0%, #b53121 100%);
      position: relative;
      overflow: hidden;
      padding: 80px 0 70px;
      color: white;
    }

    .hero-bg-texture {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.12;
      mix-blend-mode: overlay;
    }

    .hero-content {
      position: relative;
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }

    .hero-text {
      flex: 1 1 500px;
    }

    .hero h1 {
      font-size: 44px;
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: white;
    }

    .hero-sub {
      font-size: 20px;
      opacity: 0.9;
      margin-bottom: 32px;
      max-width: 550px;
    }

    .hero-buttons {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }

    .hero-image {
      flex: 1 1 400px;
      background: rgba(255,255,255,0.15);
      border-radius: var(--radius-lg);
      padding: 16px;
      backdrop-filter: blur(4px);
    }

    .hero-image img {
      border-radius: 14px;
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .floating-badges {
      display: flex;
      gap: 16px;
      margin-top: 36px;
      flex-wrap: wrap;
    }

    .badge-pill {
      background: rgba(255,255,255,0.2);
      backdrop-filter: blur(8px);
      padding: 10px 22px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 18px;
      display: flex;
      align-items: center;
      gap: 6px;
      color: white;
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }

    @media (max-width: 640px) {
      .hero h1 {
        font-size: 32px;
      }
      .hero {
        padding: 50px 0;
      }
    }

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

    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--brand-dark);
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60px;
      height: 3px;
      background: var(--brand-red);
      border-radius: 2px;
    }

    .bg-soft {
      background: var(--gray-bg);
    }

    /* 优势卡片错落网格 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 48px;
    }

    .adv-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 28px 24px;
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
      border-left: 5px solid var(--brand-red);
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .adv-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-hover-shadow);
    }

    .adv-icon {
      font-size: 34px;
      color: var(--brand-red);
    }

    .wide-stat-card {
      grid-column: span 2;
      background: var(--brand-dark);
      color: white;
      border-radius: var(--radius-lg);
      padding: 28px 32px;
      display: flex;
      align-items: center;
      justify-content: space-around;
      flex-wrap: wrap;
    }

    @media (max-width: 768px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
      .wide-stat-card {
        grid-column: span 1;
      }
    }

    /* 服务左右交替 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 70px;
    }

    .service-row.reverse {
      flex-direction: row-reverse;
    }

    .service-img {
      flex: 1 1 45%;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }

    .service-img img {
      width: 100%;
      height: 340px;
      object-fit: cover;
    }

    .service-desc {
      flex: 1 1 50%;
    }

    .feature-list {
      list-style: none;
      padding: 0;
    }

    .feature-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    @media (max-width: 768px) {
      .service-row, .service-row.reverse {
        flex-direction: column;
      }
    }

    /* 案例网格 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
      margin-top: 40px;
    }

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

    .case-card:hover img {
      transform: scale(1.04);
    }

    .case-img {
      height: 220px;
      overflow: hidden;
    }

    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .case-info {
      padding: 22px;
    }

    .tag {
      background: var(--brand-gold);
      color: #1a1a1a;
      font-weight: 600;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 14px;
    }

    @media (max-width: 640px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }

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

    .accordion-title {
      background: transparent;
      padding: 18px 10px;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: background 0.2s;
    }

    .accordion-title:hover {
      background: rgba(232,69,45,0.04);
    }

    .accordion-content {
      padding: 0 10px 20px;
      color: var(--text-muted);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #E8452D, #b53121);
      padding: 70px 24px;
      text-align: center;
      color: white;
      border-radius: 0;
      position: relative;
    }

    /* 联系表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 44px;
      margin-top: 36px;
    }

    .form-input {
      width: 100%;
      padding: 14px 16px;
      border: 1px solid #ddd;
      border-radius: var(--radius-sm);
      margin-bottom: 18px;
      transition: 0.2s;
    }

    .form-input:focus {
      border-color: var(--brand-red);
      box-shadow: 0 0 0 3px rgba(232,69,45,0.15);
      outline: none;
    }

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

    footer {
      background: var(--brand-dark);
      color: #b0b0b0;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }

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

    .footer-col h4 {
      color: white;
      font-weight: 600;
      margin-bottom: 18px;
    }

    .copyright {
      border-top: 1px solid #333;
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
    }