/* roulang page: index */
/* ===== 设计变量系统 ===== */
    :root {
      --primary: #0A0E27;
      --accent: #00F0FF;
      --emphasis: #FF4655;
      --bg-light: #F5F6FA;
      --card: #FFFFFF;
      --card-dark: #111633;
      --text-main: #1A1A2E;
      --text-muted: #5A5C6E;
      --shadow-sm: 0 4px 20px rgba(10, 14, 39, 0.06);
      --shadow-hover: 0 8px 30px rgba(10, 14, 39, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 24px;
      --transition: 0.25s ease;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-number: 'DIN Alternate', 'Bebas Neue', 'Courier New', monospace;
    }
    
    /* ===== 全局重置与基础 ===== */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      font-size: 16px;
      font-weight: 400;
      line-height: 1.75;
      color: var(--text-main);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input {
      font-family: inherit;
      outline: none;
      border: none;
    }
    
    /* ===== 容器与布局 ===== */
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }
    section {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 50px 0;
      }
    }
    
    /* ===== 导航栏（搜索主导 + 毛玻璃） ===== */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.15);
      padding: 12px 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }
    .nav-logo {
      font-family: var(--font-title);
      font-size: 1.6rem;
      font-weight: 700;
      background: linear-gradient(135deg, #00F0FF 0%, #0A9EFF 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      gap: 24px;
      align-items: center;
    }
    .nav-links a {
      color: #ccc;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color var(--transition);
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .nav-search {
      flex: 1;
      max-width: 40%;
      margin: 0 24px;
      position: relative;
    }
    .nav-search input {
      width: 100%;
      padding: 12px 20px 12px 44px;
      border-radius: var(--radius-input);
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(0, 240, 255, 0.35);
      color: #fff;
      font-size: 0.95rem;
      transition: border var(--transition), box-shadow var(--transition);
    }
    .nav-search input::placeholder {
      color: #8A8C9E;
    }
    .nav-search input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.15);
    }
    .nav-search .search-icon {
      position: absolute;
      left: 18px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--accent);
      font-size: 1rem;
    }
    /* 移动端菜单汉堡按钮 */
    .menu-toggle {
      display: none;
      background: none;
      color: #fff;
      font-size: 1.8rem;
      cursor: pointer;
      padding: 8px;
    }
    @media (max-width: 768px) {
      .nav-links, .nav-search {
        display: none;
      }
      .nav-container {
        flex-wrap: nowrap;
      }
      .menu-toggle {
        display: block;
      }
      .mobile-menu-open .nav-links,
      .mobile-menu-open .nav-search {
        display: flex;
        flex-direction: column;
        width: 100%;
        margin: 12px 0 0;
        gap: 12px;
      }
      .mobile-menu-open .nav-search {
        max-width: 100%;
      }
    }
    
    /* ===== 按钮系统 ===== */
    .btn-primary {
      background: var(--emphasis);
      color: #fff;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      display: inline-block;
      text-align: center;
      transition: background var(--transition), box-shadow var(--transition);
      cursor: pointer;
      border: none;
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: #E63240;
      box-shadow: 0 0 16px rgba(255, 70, 85, 0.4);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      border-radius: var(--radius-btn);
      padding: 12px 30px;
      font-weight: 600;
      display: inline-block;
      transition: all var(--transition);
      cursor: pointer;
    }
    .btn-outline:hover {
      background: var(--accent);
      color: #0A0E27;
    }
    .btn-white {
      background: #fff;
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
    }
    
    /* ===== 卡片系统 ===== */
    .card {
      background: var(--card);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .card-dark {
      background: var(--card-dark);
      color: #fff;
    }
    
    /* ===== Hero 首屏 ===== */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0A0E27 0%, #0D1330 100%);
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.3;
      z-index: 0;
    }
    .hero .container {
      position: relative;
      z-index: 2;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: #fff;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #C0C4D8;
      margin: 24px 0 36px;
      max-width: 650px;
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 32px;
      }
      .hero-sub {
        font-size: 1rem;
      }
    }
    .pulse-animation {
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(255, 70, 85, 0.5); }
      70% { box-shadow: 0 0 0 12px rgba(255, 70, 85, 0); }
      100% { box-shadow: 0 0 0 0 rgba(255, 70, 85, 0); }
    }
    
    /* ===== 痛点不对称卡片 ===== */
    .pain-points {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }
    @media (max-width: 768px) {
      .pain-points {
        grid-template-columns: 1fr;
      }
    }
    .pain-card-large {
      border-left: 6px solid rgba(255, 70, 85, 0.5);
      padding: 32px;
    }
    
    /* ===== 解决方案图文交替 ===== */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 40px;
      margin-bottom: 64px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    @media (max-width: 768px) {
      .solution-row, .solution-row.reverse {
        flex-direction: column;
      }
    }
    .solution-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .solution-text {
      flex: 1;
    }
    
    /* ===== 数据滚动深色区 ===== */
    .stats-section {
      background: #0A0E27;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 800;
      color: var(--accent);
    }
    
    /* ===== 证言横向滚动（桌面） ===== */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .testimonial-card {
      min-width: 340px;
      scroll-snap-align: start;
      border-left: 4px solid var(--accent);
    }
    @media (max-width: 768px) {
      .testimonial-scroll {
        flex-direction: column;
        overflow-x: visible;
      }
      .testimonial-card {
        min-width: auto;
      }
    }
    
    /* ===== FAQ 手风琴 ===== */
    .faq-item {
      border-bottom: 1px solid #E0E2EA;
      background: #F5F6FA;
      transition: background var(--transition);
      border-radius: 4px;
      margin-bottom: 8px;
    }
    .faq-question {
      padding: 18px 20px;
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 20px 18px;
      display: none;
      color: var(--text-muted);
      line-height: 1.8;
    }
    .faq-item.active {
      background: #fff;
      box-shadow: var(--shadow-sm);
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-icon {
      transition: transform 0.3s;
      font-size: 1.4rem;
      color: var(--accent);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    
    /* ===== 终局 CTA 区 ===== */
    .final-cta {
      background: linear-gradient(135deg, #0A0E27 0%, #1A1F4A 100%);
    }
    .cta-input {
      border-radius: var(--radius-btn);
      border: 1px solid rgba(0, 240, 255, 0.4);
      background: rgba(255,255,255,0.05);
      padding: 14px 18px;
      color: #fff;
      width: 100%;
      transition: border var(--transition), box-shadow var(--transition);
    }
    .cta-input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(0,240,255,0.2);
    }
    
    /* ===== 页脚 ===== */
    .footer {
      background: #0A0E27;
      color: #8A8C9E;
      padding: 40px 0 20px;
    }
    .footer a:hover {
      color: var(--accent);
    }