/* roulang page: index */
/* ----- 设计系统变量 & 基础重置 ----- */
    :root {
      --bg-deep: #0A0E17;
      --primary-green: #00E5A0;
      --accent-orange: #FF6B35;
      --card-bg: #1A1F2B;
      --border-dim: #2A3040;
      --text-muted: #8E9BAE;
      --text-secondary: #B0BEC5;
      --text-primary: #FFFFFF;
      --glass-bg: rgba(26, 31, 43, 0.7);
      --glass-border: rgba(0, 229, 160, 0.15);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --glow-green: 0 0 20px rgba(0, 229, 160, 0.3);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-input: 12px;
      --radius-tag: 8px;
      --font-mono: 'JetBrains Mono', 'Courier New', monospace;
      --font-sans: 'Inter', 'SF Pro Text', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      font-weight: 400;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    a, button, input {
      font-family: inherit;
    }

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

    /* ----- 导航栏 (沉浸式玻璃) ----- */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 1rem 2rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: var(--transition-smooth);
      background: transparent;
      backdrop-filter: blur(0px);
      border-bottom: 1px solid transparent;
    }

    .nav-bar.scrolled {
      background: rgba(10, 14, 23, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--primary-green);
      box-shadow: 0 4px 20px rgba(0,229,160,0.1);
    }

    .logo {
      font-weight: 800;
      font-size: 1.6rem;
      letter-spacing: -0.5px;
      color: var(--primary-green);
      display: flex;
      align-items: center;
      gap: 0.5rem;
      text-decoration: none;
    }

    .logo i {
      font-size: 1.8rem;
      color: var(--primary-green);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      letter-spacing: 0.3px;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-green);
    }

    .nav-cta {
      background: var(--primary-green);
      color: var(--bg-deep);
      border: none;
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 0.9rem;
      cursor: pointer;
      transition: var(--transition-smooth);
      white-space: nowrap;
      box-shadow: 0 4px 12px rgba(0,229,160,0.4);
    }

    .nav-cta:hover {
      background: #00c48c;
      box-shadow: 0 0 18px rgba(0,229,160,0.6);
      transform: scale(1.02);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }

    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--primary-green);
      transition: 0.3s;
    }

    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(10, 14, 23, 0.96);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2.5rem;
      z-index: 999;
      transform: translateX(100%);
      transition: transform 0.35s ease-in-out;
    }

    .mobile-menu.open {
      transform: translateX(0);
    }

    .mobile-menu a {
      font-size: 1.8rem;
      color: var(--text-primary);
      text-decoration: none;
      font-weight: 600;
    }

    .mobile-menu .close-menu {
      position: absolute;
      top: 2rem;
      right: 2rem;
      font-size: 2rem;
      color: var(--primary-green);
      background: none;
      border: none;
    }

    /* ----- 首屏 Hero ----- */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      background-color: rgba(0,0,0,0.45);
      position: relative;
      padding: 6rem 0 4rem;
    }

    .hero-grid {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 3rem;
    }

    .hero-left {
      flex: 1 1 55%;
    }

    .hero-right {
      flex: 1 1 40%;
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
      position: relative;
    }

    .hero h1 {
      font-weight: 800;
      font-size: clamp(2.5rem, 5vw, 4rem);
      letter-spacing: -0.02em;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      color: white;
      text-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }

    .hero-sub {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 2.5rem;
      max-width: 550px;
    }

    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary-green);
      color: var(--bg-deep);
      border: none;
      padding: 0.9rem 2.4rem;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      transition: var(--transition-smooth);
      box-shadow: 0 6px 18px rgba(0,229,160,0.45);
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
    }

    .btn-primary:hover {
      background: #00c48c;
      box-shadow: 0 0 26px rgba(0,229,160,0.7);
      transform: translateY(-2px);
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid var(--primary-green);
      color: var(--primary-green);
      padding: 0.9rem 2.4rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: rgba(0,229,160,0.05);
      backdrop-filter: blur(4px);
      cursor: pointer;
      transition: var(--transition-smooth);
    }

    .btn-ghost:hover {
      background: rgba(0,229,160,0.2);
      border-color: #fff;
    }

    .glass-card-stack {
      display: flex;
      flex-direction: column;
      gap: 1.2rem;
    }

    .float-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 1.5rem;
      box-shadow: var(--shadow-card);
      color: white;
      transform: rotate(0.5deg);
      transition: transform 0.3s;
    }

    .float-card:nth-child(2) {
      transform: rotate(-0.5deg) translateX(20px);
    }

    .float-card:hover {
      transform: translateY(-6px) rotate(0);
      box-shadow: var(--glow-green);
      border-color: var(--primary-green);
    }

    /* ----- 实时指标看板 ----- */
    .stats-section {
      padding: 5rem 0;
      background: var(--bg-deep);
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .stat-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      text-align: center;
      border-bottom: 2px solid rgba(0,229,160,0.4);
    }

    .stat-number {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 2.6rem;
      color: var(--primary-green);
      margin-bottom: 0.5rem;
    }

    .stat-label {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    /* ----- 核心服务矩阵 ----- */
    .services-section {
      padding: 5rem 0;
      background: var(--bg-deep);
    }

    .section-title {
      font-weight: 600;
      font-size: clamp(1.8rem, 3.5vw, 2.5rem);
      margin-bottom: 3rem;
      text-align: center;
      position: relative;
    }

    .section-title::after {
      content: '';
      display: block;
      width: 70px;
      height: 3px;
      background: var(--primary-green);
      margin: 1rem auto 0;
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--glass-bg);
      backdrop-filter: blur(14px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      transition: var(--transition-smooth);
    }

    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--glow-green);
      border-color: var(--primary-green);
    }

    .service-icon {
      font-size: 2.2rem;
      color: var(--primary-green);
      margin-bottom: 1.5rem;
    }

    .service-card h4 {
      font-weight: 700;
      font-size: 1.3rem;
      margin-bottom: 0.8rem;
    }

    .service-desc {
      color: var(--text-muted);
      font-size: 0.95rem;
      border-top: 1px solid var(--border-dim);
      padding-top: 1rem;
      margin-top: 1rem;
    }

    /* ----- 对比组件 ----- */
    .compare-section {
      padding: 5rem 0;
    }

    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2.5rem;
      align-items: start;
    }

    .compare-col {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem;
    }

    .compare-col.highlight {
      background: var(--glass-bg);
      backdrop-filter: blur(14px);
      border: 1px solid var(--primary-green);
    }

    .compare-item {
      display: flex;
      align-items: center;
      gap: 1rem;
      margin-bottom: 1.2rem;
      padding-bottom: 0.8rem;
      border-bottom: 1px solid var(--border-dim);
    }

    .text-strikethrough {
      text-decoration: line-through;
      color: var(--text-muted);
    }

    .green-check {
      color: var(--primary-green);
      font-weight: 700;
    }

    /* ----- FAQ 手风琴 ----- */
    .faq-section {
      padding: 5rem 0;
    }

    .accordion-item {
      background: var(--glass-bg);
      backdrop-filter: blur(8px);
      margin-bottom: 1rem;
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--glass-border);
    }

    .accordion-header {
      padding: 1.2rem 1.8rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      background: rgba(0,0,0,0.3);
    }

    .accordion-content {
      padding: 0 1.8rem;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.45s ease, padding 0.3s;
      background: rgba(26,31,43,0.6);
      color: var(--text-secondary);
    }

    .accordion-item.active .accordion-content {
      padding: 1.2rem 1.8rem;
      max-height: 300px;
    }

    /* ----- CTA 转化区 ----- */
    .cta-section {
      padding: 5rem 0;
      background: linear-gradient(180deg, #0A0E17 0%, #121724 100%);
    }

    .cta-card {
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      border-radius: 32px;
      padding: 4rem 2rem;
      text-align: center;
      max-width: 700px;
      margin: 0 auto;
      border: 1px solid var(--primary-green);
    }

    .cta-form {
      display: flex;
      gap: 1rem;
      margin-top: 2.5rem;
      flex-wrap: wrap;
      justify-content: center;
    }

    .cta-input {
      background: #0A0E17;
      border: 1px solid var(--primary-green);
      border-radius: var(--radius-input);
      padding: 0.9rem 1.5rem;
      color: white;
      width: 280px;
      outline: none;
    }

    .cta-input:focus {
      box-shadow: 0 0 15px rgba(0,229,160,0.5);
    }

    /* 页脚 */
    .footer {
      padding: 2rem 0;
      text-align: center;
      border-top: 1px solid var(--primary-green);
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      .services-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr; }
      .compare-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 2.5rem; }
    }