/* roulang page: index */
/* 全局设计变量与重置 */
    :root {
      --primary-deep: #0A0E17;
      --accent-green: #00E676;
      --accent-red: #FF3D00;
      --bg-light: #F8F9FA;
      --bg-faq: #F0F2F5;
      --white: #FFFFFF;
      --text-dark: #212529;
      --text-muted: #6C757D;
      --border-light: #e9ecef;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 12px 32px rgba(0,0,0,0.08);
      --shadow-nav: 0 2px 12px rgba(0,0,0,0.04);
      --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-number: "Inter", "Roboto", sans-serif;
      --transition: 0.3s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      outline: none;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
    }

    /* 导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      background: var(--white);
      z-index: 100;
      box-shadow: none;
      transition: box-shadow 0.3s;
      border-bottom: 1px solid transparent;
    }

    .site-header.scrolled {
      box-shadow: var(--shadow-nav);
      border-bottom: 1px solid var(--border-light);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-deep);
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary-deep);
      border-radius: 50%;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .logo-icon::before {
      content: "🐼";
      font-size: 1.5rem;
      filter: drop-shadow(0 0 2px rgba(255,255,255,0.5));
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-dark);
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-green);
      transition: width 0.3s;
    }

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

    .nav-links a.active {
      color: var(--accent-green);
    }

    .btn-primary {
      background: var(--accent-green);
      color: var(--primary-deep);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      box-shadow: 0 4px 12px rgba(0,230,118,0.25);
    }

    .btn-primary:hover {
      background: #00e676;
      filter: brightness(1.1);
      box-shadow: 0 0 20px rgba(0,230,118,0.4);
      transform: translateY(-1px);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-deep);
    }

    /* Hero */
    .hero {
      background: var(--bg-light);
      padding: 60px 0 80px;
      position: relative;
      overflow: hidden;
    }

    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-content {
      flex: 1 1 50%;
    }

    .hero-watermark {
      position: absolute;
      left: 5%;
      top: 20%;
      font-size: 12rem;
      opacity: 0.02;
      font-weight: 700;
      color: #000;
      pointer-events: none;
      transform: rotate(-5deg);
    }

    .hero h1 {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary-deep);
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 480px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: var(--accent-green);
      border-color: var(--accent-green);
      color: #000;
    }

    .hero-stats {
      display: flex;
      gap: 40px;
    }

    .stat-item {
      display: flex;
      flex-direction: column;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent-green);
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .hero-image {
      flex: 1 1 50%;
      position: relative;
    }

    .hero-image img {
      border-radius: 20px;
      box-shadow: var(--shadow-card-hover);
      clip-path: polygon(5% 0%, 100% 0%, 95% 100%, 0% 100%);
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 40px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--primary-deep);
    }

    .section-desc {
      color: var(--text-muted);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      margin-top: 40px;
    }

    .feature-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      text-align: left;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }

    .feature-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 700;
      color: transparent;
      -webkit-text-stroke: 2px var(--accent-green);
      margin-bottom: 16px;
      transition: var(--transition);
    }

    .feature-card:hover .feature-number {
      color: var(--accent-green);
      -webkit-text-stroke: 0;
    }

    .feature-card h3 {
      font-size: 1.5rem;
      margin-bottom: 12px;
      font-weight: 700;
    }

    /* 服务项目 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
      flex-wrap: wrap;
    }

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

    .service-img {
      flex: 1 1 45%;
    }

    .service-img img {
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }

    .service-text {
      flex: 1 1 45%;
    }

    .service-text h3 {
      font-size: 28px;
      margin-bottom: 16px;
    }

    .link-green {
      color: var(--accent-green);
      font-weight: 600;
      border-bottom: 2px solid var(--accent-green);
      display: inline-block;
      margin-top: 12px;
      transition: 0.2s;
    }

    .link-green:hover {
      border-bottom-width: 4px;
    }

    /* 案例走马灯 */
    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }

    .case-scroll::-webkit-scrollbar {
      display: none;
    }

    .case-card {
      min-width: 320px;
      max-width: 360px;
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      scroll-snap-align: start;
      flex-shrink: 0;
      transition: var(--transition);
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }

    .case-card img {
      border-radius: 12px 12px 0 0;
      height: 200px;
      object-fit: cover;
      width: 100%;
    }

    .case-info {
      padding: 20px 24px;
    }

    .case-highlight {
      font-family: var(--font-number);
      color: var(--accent-green);
      font-weight: 700;
      font-size: 1.8rem;
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
      margin-top: 40px;
    }

    .step-item {
      text-align: center;
      flex: 1;
      position: relative;
    }

    .step-circle {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      background: var(--white);
      border: 2px dashed var(--accent-green);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.5rem;
      margin: 0 auto 16px;
      transition: var(--transition);
    }

    .step-item.active .step-circle {
      background: var(--accent-green);
      border-style: solid;
      color: #000;
    }

    /* FAQ */
    .faq-section {
      background: var(--bg-faq);
    }

    .faq-item {
      background: var(--white);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: var(--shadow-card);
    }

    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 700;
      cursor: pointer;
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-muted);
      display: none;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    /* CTA横幅 */
    .cta-banner {
      background: var(--primary-deep);
      padding: 80px 0;
      text-align: center;
      position: relative;
    }

    .cta-banner h2 {
      color: white;
      font-size: 2.5rem;
      margin-bottom: 24px;
    }

    /* 页脚 */
    .site-footer {
      background: #0A0E17;
      color: #ccc;
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .social-icons i {
      font-size: 1.2rem;
      margin-right: 12px;
      border: 1px solid #555;
      border-radius: 50%;
      padding: 8px;
      transition: 0.2s;
    }

    .social-icons i:hover {
      background: var(--accent-green);
      border-color: var(--accent-green);
      color: #000;
    }

    @media (max-width: 1024px) {
      .hero h1 { font-size: 42px; }
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .hero .container { flex-direction: column; }
      .hero-image { margin-top: 40px; }
      .features-grid { grid-template-columns: 1fr; }
      .service-row, .service-row.reverse { flex-direction: column; }
      .process-steps { flex-wrap: wrap; gap: 30px; }
      .hero h1 { font-size: 36px; }
    }