/* roulang page: index */
:root {
      --sq-red: #E60012;
      --sq-deep: #1A1A2E;
      --sq-gold: #FFB800;
      --bg-light: #F7F8FA;
      --card-white: #FFFFFF;
      --text-primary: #1A1A2E;
      --text-secondary: #4A4A5A;
      --text-muted: #8C8C9A;
      --border-light: #E2E4E9;
      --shadow-card: 0 4px 15px rgba(0, 0, 0, 0.05);
      --shadow-hover: 0 15px 30px rgba(0, 0, 0, 0.08);
      --radius-card: 16px;
      --radius-btn: 10px;
      --container-max: 1260px;
      --header-height: 76px;
    }

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

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

    h1, h2, h3, h4, .number-stat {
      font-weight: 600;
      color: var(--text-primary);
      line-height: 1.3;
    }

    h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 0.8em;
      text-align: center;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 28px;
    }

    section {
      padding: 90px 0;
      position: relative;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 10px rgba(0,0,0,0.04);
      z-index: 999;
      height: var(--header-height);
      display: flex;
      align-items: center;
      transition: background 0.3s, box-shadow 0.3s;
    }

    .navbar.scrolled {
      background: white;
      box-shadow: 0 5px 20px rgba(0,0,0,0.06);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      max-width: var(--container-max);
      margin: 0 auto;
      width: 100%;
      padding: 0 28px;
    }

    .logo {
      font-size: 28px;
      font-weight: 700;
      color: var(--sq-deep);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--sq-red);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 38px;
      list-style: none;
    }

    .nav-links a {
      text-decoration: none;
      color: var(--text-primary);
      font-weight: 500;
      font-size: 16px;
      transition: color 0.3s;
      position: relative;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -6px;
      width: 0;
      height: 2px;
      background: var(--sq-red);
      transition: width 0.2s;
    }

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

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

    .btn-nav {
      background: var(--sq-red);
      color: white !important;
      padding: 12px 26px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background 0.3s, transform 0.2s;
    }

    .btn-nav:hover {
      background: #cc0010;
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      font-size: 26px;
      cursor: pointer;
      color: var(--sq-deep);
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0E0E1A 0%, #1A1A2E 80%);
      color: white;
      padding: 140px 0 100px;
      margin-top: var(--header-height);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 50px;
    }

    .hero-text {
      flex: 1 1 480px;
    }

    .hero-text h2 {
      color: rgba(255,255,255,0.85);
      font-weight: 400;
      font-size: 22px;
      margin-bottom: 18px;
      text-align: left;
    }

    .hero-text p {
      font-size: 17px;
      color: rgba(255,255,255,0.75);
      max-width: 550px;
      margin: 20px 0 32px;
      line-height: 1.8;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--sq-red);
      color: white;
      border: none;
      padding: 15px 34px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 16px;
      cursor: pointer;
      text-decoration: none;
      transition: background 0.3s, box-shadow 0.3s;
      display: inline-block;
    }

    .btn-primary:hover {
      background: #cc0010;
      box-shadow: 0 12px 24px rgba(230,0,18,0.3);
    }

    .btn-outline-light {
      background: transparent;
      border: 1px solid white;
      color: white;
      padding: 15px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: 0.3s;
    }

    .btn-outline-light:hover {
      background: white;
      color: var(--sq-deep);
    }

    .hero-image {
      flex: 1 1 450px;
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 30px 50px rgba(0,0,0,0.4);
    }

    .hero-image img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    /* 区块标题 */
    .section-title {
      margin-bottom: 56px;
    }

    .section-subtitle {
      color: var(--text-muted);
      font-size: 17px;
      max-width: 640px;
      margin: 12px auto 30px;
    }

    /* 关于我们 */
    .about-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }

    .about-text {
      flex: 1 1 400px;
    }

    .about-image {
      flex: 1 1 450px;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .about-image img {
      width: 100%;
      display: block;
    }

    /* 服务卡片 非对称 */
    .services-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      align-items: flex-start;
      gap: 30px;
      margin-top: 20px;
    }

    .service-card {
      background: var(--card-white);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      flex: 1 1 220px;
      max-width: 260px;
      transition: all 0.3s ease;
      text-align: center;
      position: relative;
    }

    .service-card.featured {
      transform: scale(1.07);
      border-top: 4px solid var(--sq-red);
      box-shadow: var(--shadow-hover);
      z-index: 2;
    }

    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }

    .service-card.featured:hover {
      transform: scale(1.07) translateY(-8px);
    }

    .icon-circle {
      width: 68px;
      height: 68px;
      border-radius: 50%;
      background: rgba(255,184,0,0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      font-size: 32px;
      color: var(--sq-gold);
    }

    /* 数据区 */
    .data-section {
      background: var(--sq-deep);
      color: white;
    }
    .data-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      gap: 40px;
      text-align: center;
    }
    .stat-number {
      font-size: 44px;
      font-weight: 700;
      color: var(--sq-gold);
    }

    /* 案例 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 16px 0;
      scrollbar-width: thin;
    }

    .case-card {
      min-width: 290px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .case-img {
      height: 180px;
      object-fit: cover;
      width: 100%;
    }

    .case-info {
      padding: 18px;
    }

    .tag {
      background: rgba(230,0,18,0.1);
      color: var(--sq-red);
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 600;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 14px;
      margin-bottom: 16px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.03);
    }
    .faq-question {
      padding: 24px 28px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      border-left: 4px solid var(--sq-red);
    }
    .faq-answer {
      padding: 0 28px 22px;
      color: #4A4A5A;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-block {
      background: linear-gradient(105deg, #E60012 0%, #FF4D4D 100%);
      color: white;
      border-radius: 24px;
      padding: 38px 48px;
      text-align: center;
    }

    /* Footer */
    .footer {
      background: #1A1A2E;
      color: #B0B0C0;
      padding: 80px 0 30px;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      .service-card.featured { transform: scale(1.02); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-content { flex-direction: column; }
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      .services-grid { flex-direction: column; align-items: center; }
      .service-card { max-width: 340px; width: 100%; }
    }