/* roulang page: index */
:root {
      --primary: #0F1B3A;
      --primary-light: #162447;
      --accent: #FF6030;
      --accent-hover: #E55520;
      --green: #00B578;
      --gold: #FFB800;
      --red: #FA5151;
      --bg: #F8F9FC;
      --surface: #FFFFFF;
      --text: #1A1F2E;
      --text-secondary: #7B8291;
      --text-light: #B0B9CC;
      --border: #E8ECF1;
      --radius-lg: 16px;
      --radius-md: 8px;
      --shadow-sm: 0 4px 20px rgba(15,27,58,0.06);
      --shadow-md: 0 8px 30px rgba(15,27,58,0.10);
      --shadow-hover: 0 12px 28px rgba(15,27,58,0.12);
      --transition: 200ms ease;
      --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-family);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 40px;
    }
    @media (max-width: 991px) {
      .container {
        padding: 0 24px;
      }
    }
    @media (max-width: 575px) {
      .container {
        padding: 0 16px;
      }
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      transition: var(--transition);
      height: 64px;
      display: flex;
      align-items: center;
    }
    .header.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text);
      position: relative;
      padding: 8px 0;
      transition: var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent);
      border-radius: 2px;
    }
    .nav-cta {
      background: var(--accent);
      color: white;
      padding: 10px 24px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 14px;
      transition: var(--transition);
    }
    .nav-cta:hover {
      background: var(--accent-hover);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: var(--transition);
    }
    @media (max-width: 991px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: white;
        flex-direction: column;
        padding: 80px 32px 32px;
        box-shadow: -8px 0 24px rgba(0,0,0,0.08);
        transition: 0.3s ease;
        gap: 24px;
        align-items: flex-start;
      }
      .nav-links.open {
        right: 0;
      }
      .hamburger {
        display: flex;
        z-index: 1001;
      }
    }
    /* Hero */
    .hero {
      background: var(--primary);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding: 120px 0 80px;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: -50%;
      right: -20%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(255,96,48,0.15) 0%, transparent 70%);
      border-radius: 50%;
    }
    .hero-container {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1;
    }
    .hero h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      color: white;
      margin-bottom: 20px;
    }
    .hero-subtitle {
      font-size: 16px;
      color: var(--text-light);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
    }
    .btn-primary {
      background: white;
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-lg);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-primary:hover {
      background: #f0f2f8;
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-lg);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-secondary:hover {
      background: rgba(255,255,255,0.1);
    }
    .hero-badges {
      display: flex;
      gap: 32px;
    }
    .badge-item {
      color: white;
    }
    .badge-number {
      font-size: 28px;
      font-weight: 700;
      color: var(--accent);
      display: block;
    }
    .badge-label {
      font-size: 12px;
      color: var(--text-light);
    }
    .hero-image {
      flex: 1;
      display: flex;
      justify-content: flex-end;
    }
    .hero-image img {
      max-width: 100%;
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }
    @media (max-width: 991px) {
      .hero-container {
        flex-direction: column;
        text-align: center;
        gap: 40px;
      }
      .hero h1 {
        font-size: 36px;
      }
      .hero-buttons, .hero-badges {
        justify-content: center;
      }
    }
    @media (max-width: 575px) {
      .hero h1 {
        font-size: 28px;
      }
      .hero-badges {
        flex-direction: column;
        gap: 16px;
      }
    }
    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 600;
      margin-bottom: 16px;
      text-align: center;
      color: var(--text);
    }
    .section-subtitle {
      font-size: 16px;
      color: var(--text-secondary);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 48px;
    }
    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .pain-card {
      background: var(--surface);
      padding: 32px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      text-align: center;
    }
    .pain-icon {
      font-size: 32px;
      margin-bottom: 16px;
    }
    .pain-card h3 {
      font-size: 18px;
      margin-bottom: 8px;
    }
    @media (max-width: 768px) {
      .pain-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 解决方案卡片 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .solution-card {
      background: var(--surface);
      padding: 32px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .solution-icon {
      width: 48px;
      height: 48px;
      background: rgba(15,27,58,0.05);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 24px;
      margin-bottom: 20px;
      transition: var(--transition);
    }
    .solution-card:hover .solution-icon {
      background: var(--accent);
      color: white;
    }
    .solution-card h3 {
      font-size: 20px;
      margin-bottom: 12px;
    }
    .solution-desc {
      font-size: 14px;
      color: var(--text-secondary);
      margin-bottom: 20px;
      flex: 1;
    }
    .tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .tag {
      background: #f0f2f8;
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 500;
    }
    @media (max-width: 991px) {
      .solutions-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }
    @media (max-width: 575px) {
      .solutions-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 数据区 */
    .data-wall {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
      text-align: center;
    }
    .data-item {
      background: var(--surface);
      padding: 32px 16px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
    }
    .data-number {
      font-size: 40px;
      font-weight: 700;
      color: var(--accent);
    }
    .data-desc {
      font-size: 14px;
      color: var(--text-secondary);
    }
    @media (max-width: 768px) {
      .data-wall {
        grid-template-columns: repeat(2,1fr);
      }
    }
    @media (max-width: 575px) {
      .data-wall {
        grid-template-columns: 1fr;
      }
    }
    /* 证言 */
    .testimonials-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .testimonial-card {
      background: var(--surface);
      padding: 32px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      min-width: 300px;
      flex: 0 0 auto;
      scroll-snap-align: start;
    }
    .stars {
      color: var(--gold);
      margin-bottom: 12px;
    }
    .quote {
      font-style: italic;
      color: var(--text-secondary);
      margin-bottom: 16px;
    }
    .author {
      font-weight: 600;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--surface);
      border-radius: var(--radius-lg);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #f8f9fc;
      padding: 0 24px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 20px 24px;
    }
    /* CTA */
    .cta-section {
      background: var(--primary);
      text-align: center;
      padding: 80px 0;
      color: white;
    }
    .cta-btn {
      background: var(--accent);
      color: white;
      padding: 16px 40px;
      border-radius: 40px;
      font-size: 18px;
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
      margin-top: 24px;
    }
    .cta-btn:hover {
      background: var(--accent-hover);
    }
    /* 页脚 */
    .footer {
      background: var(--primary);
      color: white;
      padding: 60px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-logo {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .footer a {
      color: #b0b9cc;
      font-size: 14px;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
      color: #b0b9cc;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    .back-to-top {
      position: fixed;
      bottom: 24px;
      right: 24px;
      background: var(--accent);
      color: white;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      box-shadow: var(--shadow-md);
    }