/* roulang page: index */
:root {
      --primary: #6C3CF0;
      --primary-soft: rgba(108, 60, 240, 0.08);
      --primary-hover: #5A2FD6;
      --accent: #FF4D6A;
      --accent-hover: #E63E58;
      --dark: #1A1A2E;
      --dark-soft: rgba(26, 26, 46, 0.85);
      --text: #1A1A2E;
      --text-secondary: #5A5A7A;
      --text-light: #B0B0C0;
      --bg: #F8F7FF;
      --white: #FFFFFF;
      --card-bg: rgba(255, 255, 255, 0.95);
      --border-light: rgba(108, 60, 240, 0.08);
      --border-medium: rgba(108, 60, 240, 0.12);
      --shadow-sm: 0 4px 20px rgba(108, 60, 240, 0.06);
      --shadow-md: 0 8px 30px rgba(108, 60, 240, 0.12);
      --shadow-hover: 0 16px 40px rgba(108, 60, 240, 0.18);
      --radius-card: 16px;
      --radius-btn: 10px;
      --radius-input: 8px;
      --font-title: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", sans-serif;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      --container-max: 1280px;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      transition: var(--transition);
      border: none;
      outline: none;
    }

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

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(26, 26, 46, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      transition: background 0.3s ease;
    }

    .header.scrolled {
      background: rgba(26, 26, 46, 0.98);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: white;
      letter-spacing: 0.5px;
    }

    .logo i {
      color: var(--accent);
      font-size: 2rem;
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      align-items: center;
    }

    .nav-links a {
      color: rgba(255, 255, 255, 0.8);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 8px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.3s ease;
    }

    .nav-links a:hover {
      color: white;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      letter-spacing: 0.3px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 4px 15px rgba(255, 77, 106, 0.3);
      white-space: nowrap;
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 8px 25px rgba(255, 77, 106, 0.45);
      transform: scale(1.02);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: white;
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      backdrop-filter: blur(4px);
    }

    .btn-outline:hover {
      background: rgba(108, 60, 240, 0.15);
      border-color: white;
    }

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

    .hamburger span {
      width: 26px;
      height: 2px;
      background: white;
      border-radius: 4px;
      transition: 0.3s;
    }

    /* 移动端导航 */
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(26, 26, 46, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 30px 24px;
        gap: 24px;
        display: none;
        border-top: 1px solid rgba(255,255,255,0.05);
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        color: white;
        font-size: 1.1rem;
        font-weight: 500;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      padding: 120px 0 80px;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,26,46,0.8) 0%, rgba(108,60,240,0.5) 100%);
    }

    .hero .container {
      position: relative;
      z-index: 2;
    }

    .hero-content {
      max-width: 720px;
    }

    .hero h1 {
      font-family: var(--font-title);
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.2;
      color: white;
      margin-bottom: 24px;
      text-shadow: 0 4px 20px rgba(0,0,0,0.4);
    }

    .hero p {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 40px;
      max-width: 600px;
    }

    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }

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

    .section-title h2 {
      font-family: var(--font-title);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--dark);
    }

    .section-title p {
      color: var(--text-secondary);
      margin-top: 12px;
    }

    /* 痛点卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .pain-card {
      background: var(--white);
      padding: 32px 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .pain-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .pain-icon {
      font-size: 2.2rem;
      color: var(--accent);
      margin-bottom: 20px;
    }

    /* 解决方案图文 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }

    .solution-row.reverse {
      flex-direction: row-reverse;
    }

    .solution-text {
      flex: 1;
    }

    .solution-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }

    /* 优势 */
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .feature-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }

    .feature-icon {
      background: var(--primary-soft);
      width: 64px;
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 20px;
      margin: 0 auto 20px;
      color: var(--primary);
      font-size: 1.8rem;
      transition: var(--transition);
    }

    .feature-card:hover .feature-icon {
      background: var(--accent);
      color: white;
    }

    /* 数据 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
    }

    .stat-item h3 {
      font-size: 3.2rem;
      font-weight: 800;
      color: var(--accent);
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .testimonial-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }

    .faq-question {
      padding: 24px 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: transparent;
      width: 100%;
      text-align: left;
      font-size: 1.1rem;
    }

    .faq-answer {
      padding: 0 20px 20px;
      color: var(--text-secondary);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-band {
      background: url('/assets/images/backpic/back-2.webp') center/cover;
      position: relative;
      padding: 100px 0;
      text-align: center;
    }

    .cta-band::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(26,26,46,0.8);
    }

    .cta-content {
      position: relative;
      color: white;
    }

    /* 页脚 */
    .footer {
      background: var(--dark);
      color: var(--text-light);
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .grid-3, .grid-4, .testimonial-grid { grid-template-columns: repeat(2, 1fr); }
      .solution-row { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero h1 { font-size: 2.8rem; }
    }

    @media (max-width: 640px) {
      .grid-3, .grid-4, .testimonial-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 2rem; }
      .nav { height: 64px; }
      .hero { min-height: 90vh; }
      section { padding: 60px 0; }
    }