/* roulang page: index */
:root {
      --black-obsidian: #0A0A0A;
      --white-polar: #F2F0EB;
      --electric-green: #00E676;
      --lava-orange: #FF4D2E;
      --dark-bamboo: #1A1D20;
      --matte-gold: #C9A96E;
      --gray-muted: #B0B0B0;
      --card-shadow: 0 4px 24px rgba(0,0,0,0.4);
      --card-hover-shadow: 0 8px 40px rgba(0,230,118,0.15);
      --border-light: rgba(242,240,235,0.08);
      --max-width: 1280px;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --transition-main: 0.25s ease;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: 'Noto Sans SC', 'Inter', sans-serif;
      background-color: var(--black-obsidian);
      color: var(--white-polar);
      line-height: 1.75;
      font-size: 16px;
      font-weight: 400;
    }
    
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
      body {
        font-size: 15px;
      }
    }
    
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(26, 29, 32, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0, 230, 118, 0.15);
      transition: background 0.3s ease;
    }
    
    .navbar.scrolled {
      background: rgba(26, 29, 32, 1);
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--white-polar);
      text-decoration: none;
      letter-spacing: 0.5px;
      white-space: nowrap;
    }
    
    .logo i {
      font-size: 2rem;
      color: var(--electric-green);
    }
    
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    
    .nav-link {
      color: var(--white-polar);
      text-decoration: none;
      font-weight: 400;
      font-size: 1rem;
      transition: color 0.2s;
      position: relative;
    }
    
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--electric-green);
      transition: width 0.25s ease;
    }
    
    .nav-link:hover {
      color: var(--electric-green);
    }
    
    .nav-link:hover::after {
      width: 100%;
    }
    
    .nav-cta {
      background: var(--electric-green);
      color: var(--black-obsidian);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      text-decoration: none;
      transition: background 0.25s, color 0.25s;
      margin-left: 16px;
      white-space: nowrap;
    }
    
    .nav-cta:hover {
      background: var(--black-obsidian);
      color: var(--electric-green);
      outline: 1px solid var(--electric-green);
    }
    
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--white-polar);
      background: none;
      border: none;
      cursor: pointer;
    }
    
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--black-obsidian);
        flex-direction: column;
        align-items: center;
        padding: 32px 0;
        gap: 24px;
        display: none;
        border-bottom: 1px solid var(--electric-green);
      }
      .nav-menu.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .nav-cta {
        margin-left: 0;
      }
    }
    
    /* 区块间距 */
    section {
      padding: 80px 0;
    }
    
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    
    /* Hero */
    .hero {
      padding-top: 120px;
      background: radial-gradient(circle at 30% 40%, rgba(0,230,118,0.08) 0%, var(--black-obsidian) 70%);
      position: relative;
      overflow: hidden;
    }
    
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    
    .hero-text h1 {
      font-size: 42px;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 16px;
      line-height: 1.2;
      color: var(--white-polar);
    }
    
    .hero-sub {
      font-size: 1.2rem;
      color: var(--gray-muted);
      margin-bottom: 32px;
    }
    
    .hero-stats {
      display: flex;
      gap: 40px;
      margin-bottom: 32px;
    }
    
    .stat-item {
      display: flex;
      flex-direction: column;
    }
    
    .stat-number {
      font-family: 'Inter', sans-serif;
      font-size: 42px;
      font-weight: 700;
      color: var(--electric-green);
    }
    
    .stat-label {
      font-size: 0.9rem;
      color: var(--gray-muted);
    }
    
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    
    .btn-primary {
      background: var(--electric-green);
      color: var(--black-obsidian);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      text-decoration: none;
      transition: background 0.25s, color 0.25s;
      display: inline-block;
      text-align: center;
    }
    
    .btn-primary:hover {
      background: transparent;
      color: var(--electric-green);
      outline: 2px solid var(--electric-green);
    }
    
    .btn-ghost {
      background: transparent;
      color: var(--white-polar);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      text-decoration: none;
      border: 1px solid var(--white-polar);
      transition: all 0.25s;
    }
    
    .btn-ghost:hover {
      border-color: var(--electric-green);
      color: var(--electric-green);
      background: rgba(0,230,118,0.05);
    }
    
    .hero-image {
      display: flex;
      justify-content: center;
    }
    
    .hero-image img {
      max-width: 100%;
      height: auto;
      border-radius: 24px;
      box-shadow: 0 0 30px rgba(0,230,118,0.2);
      transform: rotate(1deg);
    }
    
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-text h1 {
        font-size: 36px;
      }
      .hero-stats {
        gap: 24px;
        flex-wrap: wrap;
      }
      .stat-number {
        font-size: 36px;
      }
    }
    
    /* 区块标题 */
    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 48px;
      text-align: center;
      color: var(--white-polar);
    }
    
    /* 核心优势错位网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    
    .feature-card {
      background: var(--dark-bamboo);
      border-radius: var(--radius-card);
      padding: 32px;
      border-left: 4px solid var(--electric-green);
      transition: all 0.3s ease;
      box-shadow: var(--card-shadow);
    }
    
    .feature-card:hover {
      border-left: 12px solid var(--electric-green);
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
    }
    
    .feature-icon {
      font-size: 2rem;
      color: var(--electric-green);
      margin-bottom: 16px;
    }
    
    .feature-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    
    .feature-card p {
      color: var(--gray-muted);
    }
    
    /* 错位高度 */
    .feature-card:nth-child(1) { min-height: 260px; }
    .feature-card:nth-child(2) { min-height: 220px; margin-top: 20px; }
    .feature-card:nth-child(3) { min-height: 220px; margin-top: -20px; }
    .feature-card:nth-child(4) { min-height: 260px; }
    
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
      .feature-card:nth-child(n) {
        margin-top: 0;
        min-height: auto;
      }
    }
    
    /* 功能分组左右交替 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    
    .service-text {
      flex: 1;
    }
    
    .service-image {
      flex: 1;
    }
    
    .service-image img {
      width: 100%;
      border-radius: var(--radius-card);
      border: 1px solid var(--electric-green);
      box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    }
    
    .service-list {
      list-style: none;
      margin: 16px 0 24px;
    }
    
    .service-list li {
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    
    .service-list i {
      color: var(--electric-green);
    }
    
    .text-link {
      color: var(--electric-green);
      font-weight: 600;
      text-decoration: none;
    }
    
    @media (max-width: 768px) {
      .service-row, .service-row.reverse {
        flex-direction: column;
      }
    }
    
    /* 场景区 */
    .scenarios {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
    }
    .scenarios::before {
      content: '';
      position: absolute;
      top:0;left:0;right:0;bottom:0;
      background: linear-gradient(180deg, rgba(10,10,10,0.85) 0%, rgba(10,10,10,0.6) 100%);
    }
    .scenarios .container {
      position: relative;
      z-index: 2;
    }
    .scenario-cards {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .scenario-card {
      background: rgba(26,29,32,0.8);
      backdrop-filter: blur(8px);
      padding: 32px;
      border-radius: var(--radius-card);
      flex: 1 1 250px;
      text-align: center;
      color: var(--white-polar);
    }
    
    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      flex: 0 0 280px;
      background: var(--dark-bamboo);
      border-radius: var(--radius-card);
      overflow: hidden;
      scroll-snap-align: start;
      transition: transform 0.2s;
    }
    .case-card:hover {
      transform: translateY(-8px);
      border-bottom: 3px solid var(--electric-green);
    }
    .case-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    .case-info {
      padding: 16px;
    }
    .case-number {
      font-family: 'Inter', sans-serif;
      font-size: 36px;
      color: var(--electric-green);
      font-weight: 700;
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--dark-bamboo);
      margin-bottom: 12px;
      border-radius: var(--radius-card);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
      background: var(--dark-bamboo);
    }
    .faq-answer {
      padding: 0 20px 20px;
      color: var(--gray-muted);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    
    /* CTA */
    .cta-section {
      background: var(--dark-bamboo);
      text-align: center;
      padding: 80px 0;
    }
    .phone-number {
      font-family: 'Inter', sans-serif;
      font-size: 1.2rem;
      color: var(--electric-green);
      margin-left: 12px;
    }
    
    /* 页脚 */
    footer {
      background: #0A0A0A;
      padding: 48px 0 24px;
      border-top: 1px solid #2A2A2A;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer-links a {
      display: block;
      color: var(--gray-muted);
      text-decoration: none;
      margin-bottom: 8px;
    }
    .footer-links a:hover {
      color: var(--electric-green);
    }
    .social-icons i {
      font-size: 1.4rem;
      margin-right: 12px;
      color: var(--white-polar);
      transition: color 0.2s;
    }
    .social-icons i:hover {
      color: var(--electric-green);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    
    /* 粒子背景模拟 */
    .particles {
      position: absolute;
      top:0;left:0;width:100%;height:100%;
      pointer-events: none;
    }