/* roulang page: index */
:root {
      --primary: #1A5FF0;
      --primary-hover: #1650D1;
      --primary-soft: rgba(26, 95, 240, 0.08);
      --success: #00B578;
      --warning: #FF7A1A;
      --error: #FA5151;
      --text-dark: #1F2329;
      --text-secondary: #6B7280;
      --bg-light: #F5F6FA;
      --white: #FFFFFF;
      --border-light: #E5E7EB;
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.08);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-input: 24px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, -apple-system, sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: var(--transition);
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      box-shadow: 0 1px 0 var(--border-light);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      background: linear-gradient(135deg, #1A5FF0 0%, #00B578 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      font-size: 1rem;
      font-weight: 500;
      color: var(--text-dark);
      transition: var(--transition);
      position: relative;
      padding: 0.25rem 0;
    }
    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: var(--transition);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
      border: none;
      cursor: pointer;
      font-size: 1rem;
      box-shadow: 0 2px 8px rgba(26,95,240,0.2);
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: scale(1.02);
      box-shadow: 0 4px 12px rgba(26,95,240,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
      cursor: pointer;
      font-size: 1rem;
    }
    .btn-outline:hover {
      background: rgba(26,95,240,0.05);
    }
    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .menu-toggle span {
      width: 24px;
      height: 2px;
      background: var(--text-dark);
      transition: var(--transition);
    }
    @media (max-width: 1024px) {
      .nav-links {
        gap: 1.5rem;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: white;
        flex-direction: column;
        padding: 100px 40px 40px;
        gap: 2rem;
        box-shadow: -8px 0 30px rgba(0,0,0,0.1);
        transition: var(--transition);
        z-index: 999;
      }
      .nav-links.active {
        right: 0;
      }
      .menu-toggle {
        display: flex;
        z-index: 1001;
      }
      .nav-links a {
        font-size: 1.25rem;
      }
    }
    /* 区块通用 */
    section {
      padding: 100px 0;
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
    section.visible {
      opacity: 1;
      transform: translateY(0);
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    .section-title {
      font-size: 2.25rem;
      margin-bottom: 1rem;
      color: var(--text-dark);
    }
    .section-sub {
      font-size: 1.125rem;
      color: var(--text-secondary);
      max-width: 700px;
      margin-bottom: 3rem;
    }
    /* Hero */
    #hero {
      padding-top: 140px;
      padding-bottom: 80px;
      background: linear-gradient(180deg, #F5F6FA 0%, rgba(245,246,250,0.4) 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-text {
      flex: 1 1 55%;
    }
    .hero-text h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-text h1 .highlight {
      color: var(--primary);
      position: relative;
    }
    .hero-text p {
      font-size: 1.125rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .hero-visual {
      flex: 1 1 45%;
      position: relative;
      height: 420px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    }
    .hero-visual::after {
      content: "";
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(26,95,240,0.2) 0%, transparent 70%);
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        gap: 40px;
      }
      .hero-text h1 {
        font-size: 2.25rem;
      }
      .hero-visual {
        height: 250px;
        width: 100%;
      }
    }
    /* 痛点 */
    .pain-row {
      display: flex;
      align-items: center;
      gap: 40px;
      margin-bottom: 60px;
    }
    .pain-row.reverse {
      flex-direction: row-reverse;
    }
    .pain-card {
      flex: 1;
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .pain-card.dark {
      background: #F0F1F3;
      color: var(--text-secondary);
    }
    .pain-card h3 {
      font-size: 1.5rem;
      margin-bottom: 1rem;
    }
    .pain-card p {
      color: var(--text-secondary);
    }
    .pain-connect {
      width: 40px;
      display: flex;
      justify-content: center;
      color: var(--primary);
      font-size: 1.5rem;
      font-weight: 300;
    }
    @media (max-width: 768px) {
      .pain-row, .pain-row.reverse {
        flex-direction: column;
      }
      .pain-connect {
        transform: rotate(90deg);
        margin: 10px 0;
      }
    }
    /* 解决方案 */
    .solutions-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      margin-bottom: 24px;
    }
    .solution-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      position: relative;
      display: flex;
      flex-direction: column;
    }
    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .solution-img {
      height: 220px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .solution-img .overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.4) 100%);
    }
    .solution-content {
      padding: 24px;
      flex: 1;
    }
    .solution-content h3 {
      font-size: 1.5rem;
      margin-bottom: 0.5rem;
    }
    .second-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    @media (max-width: 768px) {
      .solutions-grid, .second-row {
        grid-template-columns: 1fr;
      }
    }
    /* 数据墙 */
    #results {
      background: var(--bg-light);
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
    }
    .stat-item {
      text-align: center;
      background: white;
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      min-width: 180px;
    }
    .stat-number {
      font-size: 3.5rem;
      font-weight: 700;
      background: linear-gradient(135deg, #1A5FF0, #00B578);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 0.5rem;
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: start;
    }
    .testimonial-card {
      background: white;
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--primary);
      transition: var(--transition);
    }
    .testimonial-card:hover {
      transform: translateY(-4px);
    }
    .quote {
      font-style: italic;
      color: var(--text-dark);
      margin-bottom: 1.5rem;
    }
    .author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .avatar {
      width: 44px;
      height: 44px;
      background: #E5E7EB;
      border-radius: 50%;
    }
    @media (max-width: 768px) {
      .testimonial-grid {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-wrapper {
      display: flex;
      gap: 60px;
    }
    .faq-left {
      flex: 0 0 30%;
      position: sticky;
      top: 100px;
      align-self: flex-start;
    }
    .faq-right {
      flex: 1;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.125rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
      margin-top: 0;
      background: #FAFAFC;
      border-radius: 8px;
      padding: 0 16px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
      margin-top: 12px;
    }
    @media (max-width: 768px) {
      .faq-wrapper {
        flex-direction: column;
      }
      .faq-left {
        position: static;
      }
    }
    /* CTA */
    #cta {
      background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
      color: white;
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    #cta h2 {
      color: white;
      font-size: 2.5rem;
    }
    .cta-buttons {
      display: flex;
      gap: 1rem;
      justify-content: center;
      margin-top: 2rem;
    }
    .btn-white {
      background: white;
      color: var(--primary);
      border: none;
    }
    /* 页脚 */
    #footer {
      background: #1F2329;
      color: #9CA3AF;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-col h4 {
      color: white;
      margin-bottom: 1rem;
    }
    .footer-bottom {
      border-top: 1px solid #374151;
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
      font-size: 0.875rem;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }