/* roulang page: index */
:root {
      --primary-orange: #F15A24;
      --deep-charcoal: #1E1E1E;
      --global-bg: #0C0C0C;
      --light-gray-bg: #F5F5F5;
      --neon-green: #00E5A0;
      --white: #FFFFFF;
      --text-light: #B0B0B0;
      --text-dark: #444444;
      --border-dark: #333333;
      --border-light: #E0E0E0;
      --font-main: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-number: 'Oswald', 'DIN Alternate', sans-serif;
      --radius-card: 8px;
      --radius-button: 4px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.3);
      --shadow-hover: 0 8px 30px rgba(241,90,36,0.15);
      --transition: all 0.3s ease;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-main);
      background-color: var(--global-bg);
      color: var(--white);
      line-height: 1.8;
      overflow-x: hidden;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    
    /* 排版 */
    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: 0.01em;
    }
    
    h2 {
      font-size: clamp(2rem, 4vw, 2.8rem);
      margin-bottom: 1rem;
      position: relative;
      display: inline-block;
    }
    
    h2::before {
      content: '';
      position: absolute;
      left: -16px;
      top: 50%;
      transform: translateY(-50%);
      width: 4px;
      height: 60%;
      background-color: var(--primary-orange);
      border-radius: 2px;
    }
    
    h3 {
      font-size: 1.25rem;
      font-weight: 600;
    }
    
    p {
      color: var(--text-light);
      margin-bottom: 1.2rem;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 按钮系统 */
    .btn-primary {
      background: var(--primary-orange);
      color: var(--white);
      border: none;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-button);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }
    
    .btn-primary:hover {
      background: #D94A1A;
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(241,90,36,0.4);
    }
    
    .btn-secondary {
      background: transparent;
      color: var(--white);
      border: 1.5px solid var(--white);
      padding: 0.75rem 2rem;
      border-radius: var(--radius-button);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }
    
    .btn-secondary:hover {
      background: var(--white);
      color: var(--deep-charcoal);
    }
    
    .text-link {
      color: var(--neon-green);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 0.25rem;
      transition: var(--transition);
    }
    
    .text-link:hover {
      text-decoration: underline;
      opacity: 0.9;
    }
    
    /* 导航 */
    header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(12,12,12,0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.75rem 1.5rem;
      max-width: 1200px;
      margin: 0 auto;
    }
    
    .logo {
      font-size: 1.8rem;
      font-weight: 900;
      color: var(--primary-orange);
      letter-spacing: 0.02em;
    }
    
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    
    .nav-link {
      color: var(--white);
      font-weight: 500;
      position: relative;
      padding: 0.25rem 0;
    }
    
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-orange);
      transition: width 0.3s;
    }
    
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }
    
    .nav-link:hover {
      color: var(--primary-orange);
    }
    
    .hamburger {
      display: none;
      font-size: 1.8rem;
      cursor: pointer;
      color: var(--white);
    }
    
    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: var(--deep-charcoal);
        flex-direction: column;
        justify-content: center;
        gap: 2.5rem;
        transition: right 0.3s ease;
        box-shadow: -5px 0 20px rgba(0,0,0,0.5);
        z-index: 99;
      }
      .nav-menu.active {
        right: 0;
      }
      .hamburger {
        display: block;
        z-index: 101;
      }
      .nav-container .btn-primary {
        display: none;
      }
      .nav-menu .btn-primary {
        display: inline-block;
        margin-top: 1rem;
      }
    }
    
    /* Hero */
    .hero {
      background: var(--global-bg);
      position: relative;
      overflow: hidden;
      padding: 6rem 0;
      display: flex;
      align-items: center;
      min-height: 80vh;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
    }
    
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(12,12,12,0.85) 0%, rgba(30,30,30,0.7) 100%);
      z-index: 1;
    }
    
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    
    .hero-text {
      flex: 1 1 55%;
    }
    
    .hero-text h1 {
      font-size: clamp(2.5rem, 6vw, 4.5rem);
      font-weight: 900;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      color: var(--white);
    }
    
    .hero-text p {
      font-size: 1.2rem;
      color: #CCCCCC;
      margin-bottom: 2rem;
    }
    
    .hero-visual {
      flex: 1 1 45%;
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    
    .hero-visual img {
      border-radius: var(--radius-card);
      box-shadow: 0 20px 40px rgba(241,90,36,0.2);
      max-width: 100%;
    }
    
    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero {
        padding: 4rem 1rem;
        min-height: auto;
      }
    }
    
    /* 板块通用 */
    section {
      padding: 5rem 0;
    }
    
    .section-header {
      text-align: center;
      margin-bottom: 3rem;
    }
    
    .bg-light {
      background-color: var(--light-gray-bg);
      color: var(--deep-charcoal);
    }
    
    .bg-light p {
      color: var(--text-dark);
    }
    
    .bg-light h2 {
      color: var(--deep-charcoal);
    }
    
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    
    .service-card {
      background: var(--deep-charcoal);
      padding: 2rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      text-align: center;
    }
    
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    .service-icon {
      font-size: 2.5rem;
      color: var(--primary-orange);
      margin-bottom: 1.5rem;
    }
    
    .service-card h3 {
      margin-bottom: 1rem;
    }
    
    /* 数据优势 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    
    .stat-item .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 700;
      color: var(--neon-green);
      line-height: 1.2;
    }
    
    .stat-item p {
      color: var(--white);
      font-weight: 500;
    }
    
    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    
    .case-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: 0 4px 15px rgba(0,0,0,0.05);
      transition: var(--transition);
    }
    
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 25px rgba(0,0,0,0.1);
    }
    
    .case-img {
      height: 200px;
      overflow: hidden;
    }
    
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s;
    }
    
    .case-card:hover .case-img img {
      transform: scale(1.03);
    }
    
    .case-content {
      padding: 1.5rem;
    }
    
    .case-tag {
      background: var(--primary-orange);
      color: white;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 0.75rem;
    }
    
    .case-content h3 {
      color: var(--deep-charcoal);
    }
    
    .case-content p {
      color: var(--text-dark);
      font-size: 0.9rem;
    }
    
    /* 流程 */
    .steps-container {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }
    
    .step {
      text-align: center;
      flex: 1;
      position: relative;
    }
    
    .step-circle {
      width: 48px;
      height: 48px;
      background: var(--primary-orange);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 1rem;
      font-size: 1.2rem;
    }
    
    .step h3 {
      margin-bottom: 0.5rem;
    }
    
    .step-connector {
      position: absolute;
      top: 24px;
      left: 60%;
      width: 80%;
      height: 2px;
      border-top: 2px dashed var(--neon-green);
      z-index: -1;
    }
    
    @media (max-width: 768px) {
      .steps-container {
        flex-direction: column;
        gap: 2rem;
      }
      .step-connector {
        display: none;
      }
    }
    
    /* FAQ */
    .faq-item {
      background: var(--white);
      border-radius: var(--radius-card);
      margin-bottom: 1rem;
      overflow: hidden;
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }
    
    .faq-question {
      padding: 1.25rem 2rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--deep-charcoal);
      transition: var(--transition);
    }
    
    .faq-question span {
      color: var(--primary-orange);
      font-size: 1.5rem;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 2rem;
      color: #555;
    }
    
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 2rem 1.25rem;
    }
    
    .faq-item.active .faq-question {
      color: var(--primary-orange);
    }
    
    /* CTA */
    .cta-section {
      background: var(--deep-charcoal);
      text-align: center;
      padding: 5rem 0;
      position: relative;
    }
    
    .cta-section h2 {
      color: white;
    }
    
    /* 页脚 */
    footer {
      background: var(--global-bg);
      padding: 3rem 0 1.5rem;
      font-size: 0.9rem;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 2rem;
      margin-bottom: 2rem;
    }
    
    .footer-links a {
      display: block;
      color: #999;
      margin-bottom: 0.5rem;
    }
    
    .footer-links a:hover {
      color: var(--primary-orange);
    }
    
    .copyright {
      border-top: 1px solid var(--border-dark);
      padding-top: 1.5rem;
      text-align: center;
      color: #777;
    }
    
    @media (max-width: 768px) {
      .services-grid, .stats-grid, .cases-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    
    @media (max-width: 480px) {
      .stats-grid {
        grid-template-columns: 1fr;
      }
    }