/* roulang page: index */
/* 全局设计变量与重置 */
    :root {
      --primary-purple: #7B2FFF;
      --bg-black: #0A0E17;
      --accent-cyan: #00F0FF;
      --warm-orange: #FF5C35;
      --card-bg: #1A1E28;
      --light-gray: #F2F4F8;
      --white: #FFFFFF;
      --text-light: #B0B8C5;
      --border-subtle: rgba(255,255,255,0.05);
      --shadow-card: 0 20px 40px rgba(0,0,0,0.6);
      --shadow-glow-orange: 0 0 20px rgba(255,92,53,0.5);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-btn: 12px;
      --transition: 0.3s ease-out;
      --container-max: 1280px;
      --nav-height: 72px;
    }

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

    body {
      font-family: 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-black);
      color: var(--text-light);
      line-height: 1.7;
      font-size: 16px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      background-image: radial-gradient(circle at 50% 30%, rgba(123,47,255,0.08) 0%, transparent 60%);
      background-attachment: fixed;
    }

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

    h1, h2, h3 {
      font-family: 'Noto Sans SC', sans-serif;
      color: var(--white);
      line-height: 1.2;
    }

    h1 {
      font-size: 56px;
      font-weight: 900;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, var(--primary-purple) 0%, var(--accent-cyan) 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1rem;
    }

    h2 {
      font-size: 40px;
      font-weight: 700;
      margin-bottom: 0.75rem;
    }

    h3 {
      font-size: 24px;
      font-weight: 600;
    }

    p {
      color: var(--text-light);
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: 'Noto Sans SC', sans-serif;
      font-weight: 700;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all var(--transition);
      border-radius: var(--radius-btn);
      font-size: 16px;
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--warm-orange);
      color: var(--white);
      padding: 14px 36px;
      box-shadow: 0 4px 12px rgba(255,92,53,0.3);
    }
    .btn-primary:hover {
      background: #ff7040;
      box-shadow: var(--shadow-glow-orange);
      transform: translateY(-1px);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 14px 36px;
    }
    .btn-secondary:hover {
      background: rgba(0,240,255,0.1);
      border-color: #33f5ff;
      color: #fff;
    }

    .btn-sm {
      padding: 10px 24px;
      font-size: 14px;
      border-radius: 10px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(10,14,23,0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      z-index: 1000;
      border-bottom: 1px solid rgba(255,255,255,0.05);
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-size: 24px;
      font-weight: 800;
      background: linear-gradient(to right, var(--accent-cyan), #a0f0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 0.5px;
    }

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

    .nav-link {
      font-size: 14px;
      font-weight: 500;
      color: var(--white);
      transition: color var(--transition);
    }
    .nav-link:hover {
      color: var(--accent-cyan);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--white);
      transition: var(--transition);
    }

    /* 移动端导航面板 */
    .mobile-panel {
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(10,14,23,0.96);
      backdrop-filter: blur(30px);
      padding: 2rem;
      display: none;
      flex-direction: column;
      gap: 1.5rem;
      z-index: 999;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .mobile-panel.active {
      display: flex;
    }
    .mobile-panel .nav-link {
      font-size: 18px;
      padding: 0.5rem 0;
    }

    /* 通用区块 */
    section {
      padding: 100px 0;
    }

    .section-header {
      text-align: center;
      margin-bottom: 60px;
    }

    .card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-subtle);
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      padding: 32px;
    }
    .card:hover {
      border-color: var(--accent-cyan);
      box-shadow: 0 25px 50px rgba(0,240,255,0.1);
    }

    /* Hero区域 */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: var(--nav-height);
      background: radial-gradient(circle at 50% 40%, rgba(123,47,255,0.25) 0%, var(--bg-black) 70%);
      background-blend-mode: overlay;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
    }
    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero-badges {
      display: flex;
      gap: 20px;
      margin: 2rem 0;
    }
    .badge-item {
      background: rgba(26,30,40,0.8);
      backdrop-filter: blur(10px);
      border-radius: 16px;
      padding: 16px 24px;
      border: 1px solid rgba(0,240,255,0.2);
    }
    .badge-number {
      font-family: 'Inter', sans-serif;
      font-size: 32px;
      font-weight: 800;
      color: var(--accent-cyan);
    }

    /* 痛点卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .pain-card i {
      font-size: 32px;
      color: var(--accent-cyan);
      margin-bottom: 1rem;
    }

    /* 解决方案卡片 */
    .solution-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: 24px 24px 0 0;
    }
    .solution-body {
      padding: 24px 20px;
    }
    .feature-list {
      list-style: none;
      margin-top: 1rem;
    }
    .feature-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-light);
      margin-bottom: 8px;
    }
    .feature-list i {
      color: var(--accent-cyan);
    }

    /* 数据墙 */
    .stats-wall {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 20px;
    }
    .stat-item {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 24px 32px;
      text-align: center;
      min-width: 160px;
    }
    .stat-number {
      font-family: 'Inter', sans-serif;
      font-size: 48px;
      font-weight: 800;
      color: var(--accent-cyan);
    }

    /* 证言 */
    .testimonial-card {
      border-left: 4px solid var(--accent-cyan);
      padding-left: 20px;
    }
    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 1rem;
    }
    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary-purple);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
      padding: 20px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      color: var(--white);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-light);
    }

    /* CTA区域 */
    .cta-section {
      background: linear-gradient(rgba(10,14,23,0.9), rgba(10,14,23,0.95)), url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      text-align: center;
    }
    .input-group {
      display: flex;
      max-width: 500px;
      margin: 2rem auto;
    }
    .input-group input {
      flex: 1;
      background: var(--card-bg);
      border: 1px solid rgba(255,255,255,0.1);
      padding: 14px 20px;
      border-radius: 12px 0 0 12px;
      color: white;
    }
    .input-group button {
      border-radius: 0 12px 12px 0;
    }

    footer {
      background: #0f131c;
      padding: 40px 0;
      text-align: center;
      color: var(--text-light);
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      h1 { font-size: 44px; }
      h2 { font-size: 34px; }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .grid-3 { grid-template-columns: 1fr; }
      .hero-content { flex-direction: column; }
      h1 { font-size: 36px; }
      .stats-wall { justify-content: center; }
      .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
    }