/* roulang page: index */
:root {
      --primary: #4E6EF2;
      --primary-hover: #3A5CE5;
      --primary-light: rgba(78, 110, 242, 0.08);
      --green: #00B578;
      --green-light: rgba(0, 181, 120, 0.1);
      --orange: #FF9F0A;
      --orange-light: rgba(255, 159, 10, 0.1);
      --red: #FA5151;
      --text-dark: #1F2329;
      --text-muted: #86909C;
      --bg: #F5F6FA;
      --card-bg: #FFFFFF;
      --dark-bg: #1F2329;
      --border-light: #E5E8EF;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 20px;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.02);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --transition: 200ms ease;
      --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      --max-width: 1200px;
      --header-height: 64px;
      --header-height-mobile: 56px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-system);
      background: var(--bg);
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      padding-top: var(--header-height);
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      outline: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
      font-weight: 600;
      border-radius: var(--radius-btn);
      white-space: nowrap;
    }
    h1, h2, h3, h4 {
      font-weight: 600;
      line-height: 1.3;
    }
    h1 { font-size: 2.8rem; font-weight: 700; letter-spacing: -0.5px; }
    h2 { font-size: 2.2rem; }
    h3 { font-size: 1.4rem; }
    @media (max-width: 768px) {
      h1 { font-size: 2rem; }
      h2 { font-size: 1.8rem; }
      h3 { font-size: 1.2rem; }
      .container { padding: 0 16px; }
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: #FFFFFF;
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
      z-index: 100;
      display: flex;
      align-items: center;
    }
    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--text-dark);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary), #7B8FF7);
      border-radius: 8px;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-dark);
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--text-dark);
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: var(--header-height-mobile);
        left: 0;
        width: 100%;
        height: 0;
        overflow: hidden;
        background: #FFFFFF;
        flex-direction: column;
        gap: 0;
        transition: height 0.25s ease;
        box-shadow: 0 4px 12px rgba(0,0,0,0.05);
      }
      .nav-links.open {
        height: auto;
        padding: 16px 0;
      }
      .nav-links a {
        padding: 14px 24px;
        font-size: 1.1rem;
        border-bottom: none;
        border-left: 4px solid transparent;
      }
      .nav-links a.active {
        border-left-color: var(--primary);
        background: var(--primary-light);
      }
      .menu-toggle {
        display: block;
      }
      .header { height: var(--header-height-mobile); }
      body { padding-top: var(--header-height-mobile); }
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #4E6EF2 0%, #7B8FF7 100%);
      color: #FFFFFF;
      padding: 80px 0;
      position: relative;
      overflow: hidden;
      min-height: 70vh;
      display: flex;
      align-items: center;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: -50%;
      right: -20%;
      width: 60%;
      height: 200%;
      background: radial-gradient(circle at center, rgba(255,255,255,0.08) 0%, transparent 70%);
      transform: rotate(15deg);
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1;
    }
    .hero h1 {
      font-size: 3.2rem;
      margin-bottom: 20px;
      line-height: 1.2;
    }
    .hero p {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: #FFFFFF;
      color: var(--primary);
      padding: 14px 32px;
      font-size: 1rem;
      border-radius: var(--radius-btn);
      box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    }
    .btn-primary:hover {
      background: #F0F2FF;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid rgba(255,255,255,0.7);
      color: #FFFFFF;
      padding: 14px 32px;
      font-size: 1rem;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
    }
    .hero-image {
      flex: 0.9;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 20px;
      min-height: 320px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.2);
      opacity: 0.95;
    }
    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero h1 { font-size: 2.2rem; }
      .hero p { font-size: 1rem; }
      .hero-image {
        width: 100%;
        min-height: 220px;
      }
      .hero-buttons {
        justify-content: center;
      }
    }
    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      color: var(--text-dark);
    }
    .section-title p {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-top: 12px;
    }
    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pain-card {
      background: var(--card-bg);
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      display: flex;
      align-items: flex-start;
      gap: 16px;
    }
    .pain-icon {
      font-size: 2rem;
      color: var(--orange);
      background: var(--orange-light);
      width: 48px;
      height: 48px;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    @media (max-width: 768px) {
      .pain-grid { grid-template-columns: 1fr; }
    }
    /* 解决方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .solution-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .solution-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .badge {
      display: inline-block;
      background: var(--green-light);
      color: var(--green);
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 20px;
      margin-top: 12px;
    }
    @media (max-width: 1024px) {
      .solution-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 600px) {
      .solution-grid { grid-template-columns: 1fr; }
    }
    /* 数据区 */
    .stats-row {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 24px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: var(--card-bg);
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--primary);
    }
    @media (max-width: 768px) {
      .testimonial-grid { grid-template-columns: 1fr; }
    }
    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      gap: 16px;
    }
    .step {
      flex: 1;
      text-align: center;
      background: var(--card-bg);
      padding: 24px;
      border-radius: var(--radius-card);
    }
    .step-num {
      width: 40px;
      height: 40px;
      background: var(--primary);
      color: #fff;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .process-steps { flex-direction: column; }
    }
    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 24px;
      color: var(--text-muted);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    /* CTA */
    .cta-block {
      background: linear-gradient(135deg, #4E6EF2, #7B8FF7);
      border-radius: 24px;
      padding: 64px;
      text-align: center;
      color: #fff;
    }
    /* 页脚 */
    .footer {
      background: var(--dark-bg);
      color: var(--text-muted);
      padding: 32px 0;
      font-size: 0.9rem;
    }
    .footer .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }
    .footer a {
      color: var(--text-muted);
    }
    .footer a:hover {
      color: #fff;
    }
    @media (max-width: 600px) {
      .footer .container {
        flex-direction: column;
        text-align: center;
      }
    }