/* roulang page: index */
:root {
      --primary: #0A1F2F;
      --accent: #00E5A0;
      --highlight: #FF4D2E;
      --bg-page: #F4F6F9;
      --bg-light: #EAECEF;
      --bg-white: #FFFFFF;
      --text-primary: #0A1F2F;
      --text-body: #3A3F47;
      --text-muted: #6B7280;
      --border-light: #E5E7EB;
      --shadow-card: 0 4px 20px rgba(10, 31, 47, 0.06);
      --shadow-hover: 0 8px 30px rgba(10, 31, 47, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.3s ease;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-title);
      color: var(--text-primary);
      font-weight: 600;
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
    }

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

    h3 {
      font-size: 24px;
      line-height: 1.4;
    }

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

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

    button, input, textarea {
      font-family: inherit;
      font-size: inherit;
      border: none;
      outline: none;
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: all var(--transition);
      text-align: center;
      border: 2px solid transparent;
    }

    .btn-primary {
      background-color: var(--accent);
      color: var(--primary);
      border-color: var(--accent);
    }

    .btn-primary:hover {
      background-color: #00C98A;
      border-color: #00C98A;
      box-shadow: 0 0 16px rgba(0, 229, 160, 0.4);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border-color: var(--primary);
      color: var(--primary);
    }

    .btn-outline:hover {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }

    .btn-light {
      background: white;
      color: var(--primary);
      border-color: white;
    }

    .btn-light:hover {
      background: #f0f0f0;
      border-color: #f0f0f0;
    }

    /* 导航 PC */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 31, 47, 0.85);
      backdrop-filter: blur(12px);
      z-index: 1000;
      transition: background var(--transition);
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    .navbar.scrolled {
      background: rgba(10, 31, 47, 0.98);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 22px;
      color: white;
      letter-spacing: 1px;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--accent);
      clip-path: polygon(30% 0%, 70% 0%, 100% 30%, 85% 70%, 50% 100%, 15% 70%, 0% 30%);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
      font-weight: 800;
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      color: white;
      font-weight: 500;
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease, left 0.25s ease;
    }

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

    .nav-links a:hover::after {
      width: 100%;
      left: 0;
    }

    .nav-cta {
      margin-left: 24px;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 60px;
      background: white;
      box-shadow: 0 -4px 12px rgba(0,0,0,0.06);
      z-index: 999;
      justify-content: space-around;
      align-items: center;
      border-top: 1px solid #eee;
    }

    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      color: var(--text-muted);
      transition: color var(--transition);
    }

    .mobile-nav-item.active {
      color: var(--accent);
    }

    .mobile-nav-icon {
      font-size: 20px;
      margin-bottom: 2px;
    }

    .mobile-header {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 48px;
      background: white;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
      z-index: 1000;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }

    /* HERO */
    #hero {
      padding: 140px 0 100px;
      background: var(--primary);
      position: relative;
      overflow: hidden;
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: white;
    }

    .hero-bg-geometry {
      position: absolute;
      inset: 0;
      pointer-events: none;
    }

    .hero-arc {
      position: absolute;
      width: 600px;
      height: 600px;
      border: 2px solid rgba(0, 229, 160, 0.25);
      border-radius: 40% 60% 70% 30% / 45% 55% 45% 55%;
      top: -150px;
      right: -100px;
      transform: rotate(15deg);
    }

    .hero-shield {
      position: absolute;
      bottom: -80px;
      left: -60px;
      width: 300px;
      height: 350px;
      background: rgba(0, 229, 160, 0.08);
      clip-path: polygon(50% 0%, 85% 20%, 100% 60%, 80% 100%, 20% 100%, 0% 60%, 15% 20%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      margin: 0 auto;
      text-align: center;
    }

    .hero-content h1 {
      color: white;
      margin-bottom: 20px;
    }

    .hero-content .subtitle {
      font-size: 20px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 40px;
    }

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

    /* SOLUTION 痛点与方案 */
    #solution {
      padding: 90px 0;
      background: var(--bg-page);
    }

    .solution-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .pain-card {
      background: #EAECEF;
      padding: 48px 40px;
      clip-path: polygon(0 0, 92% 0, 100% 10%, 100% 100%, 0 100%);
    }

    .solution-card {
      background: white;
      padding: 48px 40px;
      clip-path: polygon(8% 0, 100% 0, 100% 100%, 0 100%, 0 10%);
    }

    .pain-title {
      color: var(--highlight);
      font-weight: 700;
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .solution-title {
      color: var(--accent);
      font-weight: 700;
      margin-bottom: 24px;
    }

    .list-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      margin-bottom: 16px;
    }

    /* RESULTS */
    #results {
      background: var(--primary);
      padding: 80px 0;
    }

    .results-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 20px 0;
      scrollbar-width: none;
    }

    .results-scroll::-webkit-scrollbar {
      display: none;
    }

    .stat-card {
      flex: 0 0 220px;
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 16px;
      padding: 28px 20px;
      text-align: center;
    }

    .stat-number {
      font-size: 40px;
      font-weight: 700;
      color: var(--accent);
    }

    /* TESTIMONIALS */
    #testimonials {
      padding: 90px 0;
    }

    .testimonial-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.9fr;
      gap: 24px;
    }

    .testimonial-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      border-left: 3px solid var(--accent);
      position: relative;
    }

    .quote-mark {
      font-size: 60px;
      color: rgba(0,229,160,0.3);
      font-family: Georgia, serif;
    }

    /* FAQ */
    #faq {
      background: #F9FAFB;
      padding: 80px 0;
    }

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

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

    .faq-question {
      display: flex;
      align-items: center;
      gap: 16px;
      padding: 20px 0;
      cursor: pointer;
      font-weight: 600;
    }

    .faq-icon {
      width: 24px;
      height: 24px;
      transition: 0.3s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #F9FAFB;
      padding: 0 20px;
    }

    /* CONTACT */
    #contact {
      background: var(--primary);
      padding: 80px 0;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .contact-wrapper {
      display: flex;
      background: rgba(255,255,255,0.05);
      border-radius: 24px;
      overflow: hidden;
    }

    .contact-form {
      padding: 48px;
      flex: 1;
    }

    .input-field {
      width: 100%;
      padding: 14px;
      margin-bottom: 16px;
      border-radius: 8px;
      background: white;
    }

    /* FOOTER */
    footer {
      background: #0A1F2F;
      color: #9CA3AF;
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
    }

    @media (max-width: 768px) {
      .navbar { display: none; }
      .mobile-bottom-nav { display: flex; }
      .mobile-header { display: flex; }
      h1 { font-size: 32px; }
      h2 { font-size: 24px; }
      .solution-grid { grid-template-columns: 1fr; }
      .testimonial-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .results-scroll { flex-direction: column; }
      .stat-card { flex: auto; }
    }