/* roulang page: index */
/* 全局变量设计系统 */
    :root {
      --primary: #E43D2A;
      --primary-dark: #c53025;
      --accent: #00B4A6;
      --dark: #1A1D29;
      --warm-bg: #F5F0EB;
      --light-bg: #EAE6E1;
      --white: #FFFFFF;
      --text-main: #1A1D29;
      --text-secondary: #444444;
      --text-weak: #888888;
      --border-light: #E0DCD7;
      --shadow-sm: 0 4px 20px rgba(26,29,41,0.06);
      --shadow-md: 0 8px 30px rgba(26,29,41,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-title: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
      --font-number: "Inter", "Roboto", "Noto Sans SC", system-ui, sans-serif;
      --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
      --transition: 0.25s ease;
    }

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

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

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

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

    button, input {
      font-family: inherit;
    }

    h1, h2, h3 {
      font-family: var(--font-title);
      font-weight: 700;
      color: var(--dark);
    }

    h2 {
      font-size: 36px;
      line-height: 1.3;
      margin-bottom: 32px;
    }

    h3 {
      font-size: 22px;
      line-height: 1.4;
      margin-bottom: 16px;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 导航 */
    .glass-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.3);
      box-shadow: 0 2px 20px rgba(0,0,0,0.04);
      height: 72px;
      display: flex;
      align-items: center;
      transition: background var(--transition), box-shadow var(--transition);
    }

    .nav-scrolled {
      background: rgba(255, 255, 255, 0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    }

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

    .logo {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 22px;
      color: var(--dark);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo span {
      color: var(--primary);
      font-weight: 800;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--dark);
    }

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

    .btn-nav {
      background: var(--primary);
      color: var(--white) !important;
      padding: 8px 20px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      white-space: nowrap;
      margin-left: 8px;
    }

    .btn-nav:hover {
      background: var(--primary-dark);
      color: var(--white) !important;
      transform: translateY(-1px);
      box-shadow: var(--shadow-sm);
    }

    /* 汉堡菜单 */
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--dark);
      border-radius: 4px;
      transition: var(--transition);
    }

    .mobile-menu {
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(15px);
      flex-direction: column;
      padding: 24px;
      gap: 20px;
      display: none;
      z-index: 999;
      box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    }

    .mobile-menu a {
      font-size: 18px;
      font-weight: 500;
    }

    /* Hero */
    .hero-section {
      min-height: 100vh;
      background: linear-gradient(rgba(26,29,41,0.65), rgba(26,29,41,0.7)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      padding-top: 72px;
    }

    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      width: 100%;
    }

    .hero-text {
      flex: 1;
      color: var(--white);
    }

    .hero-text h1 {
      font-size: 48px;
      line-height: 1.2;
      color: var(--white);
      margin-bottom: 20px;
      font-weight: 700;
    }

    .hero-highlight {
      color: var(--primary);
    }

    .hero-desc {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
      line-height: 1.6;
    }

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

    .btn-primary, .btn-secondary {
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: var(--transition);
      text-align: center;
      border: none;
    }

    .btn-primary {
      background: var(--primary);
      color: var(--white);
      box-shadow: 0 4px 12px rgba(228,61,42,0.3);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(228,61,42,0.4);
      color: var(--white);
    }

    .btn-secondary {
      background: transparent;
      color: var(--white);
      border: 2px solid rgba(255,255,255,0.7);
    }

    .btn-secondary:hover {
      background: rgba(255,255,255,0.15);
      border-color: var(--white);
      transform: translateY(-2px);
      color: var(--white);
    }

    .hero-visual {
      flex: 0.8;
      display: flex;
      justify-content: center;
    }

    .data-card-abstract {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(12px);
      border-radius: 20px;
      padding: 28px;
      color: var(--white);
      border: 1px solid rgba(255,255,255,0.25);
    }

    .data-number {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 42px;
      color: var(--accent);
    }

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

    .section-alternate {
      background-color: var(--light-bg);
    }

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

    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(0,0,0,0.04);
      transition: var(--transition);
    }

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

    .card-icon {
      font-size: 36px;
      color: var(--accent);
      margin-bottom: 16px;
    }

    /* 解决方案 */
    .solution-layout {
      display: flex;
      gap: 48px;
      align-items: center;
    }

    .solution-text {
      flex: 1;
    }

    .solution-image {
      flex: 1;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }

    .solution-list li {
      display: flex;
      gap: 14px;
      margin-bottom: 24px;
      align-items: flex-start;
    }

    .solution-list .dot {
      width: 10px;
      height: 10px;
      background: var(--primary);
      border-radius: 50%;
      margin-top: 10px;
      flex-shrink: 0;
    }

    /* 成果数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }

    .stat-item .stat-number {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 48px;
      color: var(--primary);
    }

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

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

    .testimonial-avatar {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      margin-bottom: 16px;
      object-fit: cover;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

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

    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 18px 0;
      font-weight: 700;
      font-size: 18px;
      text-align: left;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      transition: background var(--transition);
    }

    .faq-question:hover {
      background: rgba(228,61,42,0.03);
    }

    .faq-icon {
      font-size: 24px;
      transition: transform 0.3s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      color: var(--text-secondary);
      line-height: 1.8;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 18px;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA 最终区 */
    .cta-section {
      background: linear-gradient(rgba(26,29,41,0.8), rgba(26,29,41,0.85)), url('/assets/images/backpic/back-2.webp') center/cover;
      padding: 100px 0;
      text-align: center;
      color: var(--white);
    }

    .cta-section h2 {
      color: var(--white);
    }

    .cta-buttons {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn-dark-outline {
      border: 2px solid var(--white);
      color: var(--white);
      background: transparent;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    .btn-dark-outline:hover {
      background: rgba(255,255,255,0.15);
      color: var(--white);
    }

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

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    .footer-logo {
      font-weight: 700;
      font-size: 20px;
      color: var(--white);
      margin-bottom: 14px;
    }

    .footer-links a, .footer-services a {
      display: block;
      color: #bbb;
      margin-bottom: 10px;
      font-size: 14px;
    }

    .footer-links a:hover, .footer-services a:hover {
      color: var(--accent);
    }

    .copyright {
      margin-top: 40px;
      text-align: center;
      font-size: 13px;
      color: #888;
    }

    @media (max-width: 1024px) {
      h2 { font-size: 30px; }
      .pain-grid, .testimonial-grid { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-content { flex-direction: column; }
      .hero-text h1 { font-size: 36px; }
      .solution-layout { flex-direction: column; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 520px) {
      .pain-grid, .testimonial-grid, .stats-grid { grid-template-columns: 1fr; }
      .cta-buttons .btn-primary, .cta-buttons .btn-dark-outline { width: 100%; }
      .hero-buttons .btn-primary, .hero-buttons .btn-secondary { width: 100%; }
    }