/* roulang page: index */
:root {
      --primary-green: #0B8A3E;
      --dark-charcoal: #1A1A1A;
      --electric-cyan: #00E5A0;
      --warm-gold: #D4A843;
      --bg-light: #F7F8F9;
      --bg-dark-section: #0F1419;
      --card-white: #FFFFFF;
      --text-body: #4A4F55;
      --text-light: #9BA1A7;
      --border-light: #E9ECEF;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 30px;
      --transition: all 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3 {
      font-weight: 700;
      line-height: 1.3;
    }
    h2 {
      font-size: 2.2rem;
      margin-bottom: 1.5rem;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    h2::after {
      content: '';
      height: 4px;
      width: 48px;
      background: var(--electric-cyan);
      border-radius: 2px;
      display: inline-block;
    }
    h3 {
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--dark-charcoal);
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      z-index: 999;
      display: flex;
      align-items: center;
      transition: var(--transition);
      border-bottom: 1px solid transparent;
    }
    .main-header.scrolled {
      background: #ffffff;
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      border-bottom: 1px solid #e9ecef;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--dark-charcoal);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 1px;
    }
    .logo i {
      color: var(--electric-cyan);
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--dark-charcoal);
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-links a:hover {
      color: var(--electric-cyan);
    }
    .btn-nav {
      background: var(--electric-cyan);
      color: #0F1419 !important;
      padding: 10px 26px;
      border-radius: 30px;
      font-weight: 600;
      transition: var(--transition);
      margin-left: 12px;
    }
    .btn-nav:hover {
      filter: brightness(1.1);
      transform: translateY(-1px);
      box-shadow: 0 8px 18px rgba(0,229,160,0.25);
    }
    .menu-toggle {
      display: none;
      font-size: 1.8rem;
      cursor: pointer;
      color: var(--dark-charcoal);
    }
    /* 移动端菜单 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: #ffffff;
        flex-direction: column;
        justify-content: center;
        gap: 28px;
        box-shadow: -8px 0 30px rgba(0,0,0,0.08);
        transition: right 0.4s ease;
        padding: 40px;
        z-index: 1000;
      }
      .nav-links.active {
        right: 0;
      }
      .menu-toggle {
        display: block;
        z-index: 1001;
      }
      .btn-nav {
        margin-left: 0;
        width: fit-content;
      }
    }
    /* Hero */
    .hero {
      height: 100vh;
      min-height: 650px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(0,0,0,0.65) 0%, rgba(0,0,0,0.25) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      color: white;
      padding: 0 20px;
    }
    .hero h1 {
      font-size: clamp(2.8rem, 6vw, 4.4rem);
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 1.2rem;
      text-shadow: 0 8px 24px rgba(0,0,0,0.5);
    }
    .hero-sub {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 2.5rem;
    }
    .hero-buttons {
      display: flex;
      gap: 18px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--electric-cyan);
      color: #0F1419;
      padding: 14px 38px;
      border-radius: 30px;
      font-weight: 700;
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      padding: 14px 38px;
      border-radius: 30px;
      font-weight: 600;
      transition: var(--transition);
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.12);
    }
    .scroll-hint {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: white;
      font-size: 1.8rem;
      animation: bounce 2s infinite;
    }
    @keyframes bounce {
      0%,20%,50%,80%,100%{transform:translateX(-50%) translateY(0);}
      40%{transform:translateX(-50%) translateY(-12px);}
      60%{transform:translateX(-50%) translateY(-6px);}
    }
    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    .section-intro {
      margin-bottom: 50px;
    }
    /* 优势卡片 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .adv-card {
      background: var(--card-white);
      padding: 32px 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      transition: var(--transition);
    }
    .adv-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
      border-color: var(--electric-cyan);
    }
    .adv-icon {
      font-size: 2.8rem;
      color: var(--electric-cyan);
      margin-bottom: 20px;
    }
    /* 服务网格 2x3 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      border: 1px solid transparent;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 16px 36px rgba(0,0,0,0.06);
      border-color: var(--electric-cyan);
    }
    .service-icon {
      font-size: 2.8rem;
      color: var(--electric-cyan);
      margin-bottom: 18px;
    }
    .service-link {
      margin-top: 18px;
      font-weight: 600;
      color: var(--primary-green);
      align-self: flex-start;
      transition: gap 0.2s;
    }
    .service-link i {
      margin-left: 6px;
      font-size: 0.9rem;
    }
    /* 数据带 */
    .stats-band {
      background: var(--bg-dark-section);
      color: white;
      padding: 70px 0;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 30px;
    }
    .stat-number {
      font-family: 'Inter', sans-serif;
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--electric-cyan);
      display: block;
    }
    /* 案例logo墙 */
    .partners-scroll {
      display: flex;
      gap: 50px;
      overflow-x: auto;
      padding: 20px 0;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
    }
    .partner-item {
      opacity: 0.75;
      font-weight: 600;
      font-size: 1.2rem;
      color: var(--dark-charcoal);
      transition: var(--transition);
    }
    .testimonial-card {
      background: white;
      border-radius: 16px;
      padding: 24px;
      margin-top: 20px;
      max-width: 500px;
    }
    /* 时间轴流程 */
    .timeline {
      display: flex;
      flex-direction: column;
      gap: 36px;
      position: relative;
      padding-left: 40px;
    }
    .timeline-step {
      display: flex;
      gap: 24px;
      align-items: baseline;
    }
    .step-num {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--electric-cyan);
      min-width: 60px;
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: white;
      border-radius: 12px;
      padding: 18px 22px;
      border-left: 3px solid transparent;
      transition: var(--transition);
      cursor: pointer;
    }
    .faq-item.active {
      border-left-color: var(--electric-cyan);
      background: #f9fafb;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
    }
    /* CTA banner */
    .cta-banner {
      background: #0F1419;
      text-align: center;
      padding: 80px 20px;
      color: white;
    }
    .btn-gold {
      background: transparent;
      border: 2px solid var(--warm-gold);
      color: white;
      background: var(--electric-cyan);
      color: #0F1419;
      font-weight: 700;
      padding: 14px 42px;
      border-radius: 40px;
      transition: 0.3s;
    }
    .btn-gold:hover {
      box-shadow: 0 0 22px rgba(0,229,160,0.5);
    }
    /* 页脚 */
    .footer {
      background: #1A1A1A;
      color: #9BA1A7;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .social-icons i {
      font-size: 1.4rem;
      margin-right: 18px;
      transition: color 0.2s;
    }
    .social-icons i:hover { color: var(--electric-cyan); }
    @media (max-width: 1024px) {
      .advantages-grid, .services-grid { grid-template-columns: repeat(2,1fr); }
      .faq-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .advantages-grid, .services-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero { height: 80vh; }
      .timeline { padding-left: 10px; }
    }