/* roulang page: index */
:root {
      --primary: #E63946;
      --primary-hover: #C1121F;
      --secondary: #1D3557;
      --light-bg: #F1FAEE;
      --accent: #A8DADC;
      --text-dark: #2B2D42;
      --text-muted: #8D99AE;
      --white: #FFFFFF;
      --border-light: #E0E0E0;
      --shadow-card: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.25s ease;
      --font-head: "PingFang SC Heavy", "Microsoft YaHei Bold", "Helvetica Neue", sans-serif;
      --font-body: "PingFang SC Regular", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-body);
      color: var(--text-dark);
      background-color: var(--white);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: var(--white);
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-head);
      font-size: 24px;
      font-weight: 700;
      color: var(--secondary);
      letter-spacing: 1px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary);
      clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
      display: inline-block;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-dark);
      position: relative;
      padding: 4px 0;
      transition: color var(--transition);
    }
    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--primary);
      color: var(--white) !important;
      padding: 10px 22px !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background var(--transition);
    }
    .nav-cta:hover {
      background: var(--primary-hover);
    }
    .nav-cta::after {
      display: none;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 28px;
      height: 3px;
      background: var(--secondary);
      border-radius: 2px;
      transition: var(--transition);
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--secondary);
        flex-direction: column;
        padding: 32px 24px;
        gap: 28px;
        align-items: flex-start;
        box-shadow: 0 12px 24px rgba(0,0,0,0.2);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        color: var(--white);
        font-size: 18px;
      }
      .nav-cta {
        background: var(--primary);
        width: fit-content;
      }
      .hamburger {
        display: flex;
      }
    }
    /* Hero */
    .hero {
      padding: 120px 0 80px;
      background: linear-gradient(135deg, rgba(230,57,70,0.05) 0%, rgba(29,53,87,0.05) 100%);
      display: flex;
      align-items: center;
      min-height: 85vh;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-text {
      flex: 0 0 50%;
    }
    .hero-text h1 {
      font-family: var(--font-head);
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--secondary);
      margin-bottom: 24px;
    }
    .hero-text h1 span {
      color: var(--primary);
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.6;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-block;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: all 0.2s ease;
      text-align: center;
      cursor: pointer;
      border: none;
    }
    .btn-primary {
      background: var(--primary);
      color: var(--white);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: var(--white);
    }
    .hero-image {
      flex: 0 0 50%;
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    }
    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    .hero-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(230,57,70,0.15) 0%, rgba(29,53,87,0.25) 100%);
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-text, .hero-image {
        flex: auto;
        width: 100%;
      }
      .hero-text h1 {
        font-size: 36px;
      }
      .hero-sub {
        margin-left: auto;
        margin-right: auto;
      }
      .hero-buttons {
        justify-content: center;
      }
    }
    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      font-family: var(--font-head);
      font-size: 36px;
      font-weight: 600;
      color: var(--secondary);
    }
    .section-title p {
      color: var(--text-muted);
      margin-top: 12px;
      font-size: 18px;
    }
    /* 解决方案卡片 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .solution-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      text-align: center;
    }
    .solution-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    .card-icon {
      width: 64px;
      height: 64px;
      margin: 0 auto 20px;
      border-radius: 16px;
      overflow: hidden;
      background: var(--light-bg);
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .card-icon img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .solution-card h3 {
      font-size: 24px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--secondary);
    }
    .solution-card p {
      color: var(--text-muted);
      line-height: 1.7;
    }
    @media (max-width: 768px) {
      .solutions-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 数据区 */
    .results {
      background: var(--light-bg);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-item {
      padding: 24px;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      font-family: var(--font-head);
    }
    .stat-label {
      font-size: 16px;
      color: var(--text-dark);
      margin-top: 8px;
      font-weight: 500;
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    /* 证言 */
    .testimonials-wrapper {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .testimonial-card {
      flex: 0 0 calc(33.333% - 16px);
      min-width: 280px;
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 28px;
      scroll-snap-align: start;
    }
    .testimonial-quote {
      font-size: 18px;
      line-height: 1.6;
      font-style: italic;
      color: var(--text-dark);
      position: relative;
      padding-left: 28px;
    }
    .testimonial-quote::before {
      content: "“";
      font-size: 48px;
      color: var(--accent);
      position: absolute;
      left: 0;
      top: -10px;
      line-height: 1;
    }
    .testimonial-author {
      margin-top: 20px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--light-bg);
      overflow: hidden;
    }
    .author-avatar img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .author-name {
      font-weight: 600;
    }
    .author-role {
      font-size: 14px;
      color: var(--text-muted);
    }
    @media (max-width: 768px) {
      .testimonial-card {
        flex: 0 0 85%;
      }
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: var(--white);
      border: none;
      padding: 20px 16px;
      text-align: left;
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      transition: background 0.3s;
      color: var(--secondary);
    }
    .faq-question:hover {
      background: #F8F9FA;
    }
    .faq-icon {
      font-size: 24px;
      font-weight: 300;
      color: var(--primary);
      transition: transform 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      background: #F8F9FA;
      padding: 0 16px;
      color: var(--text-dark);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
    }
    .faq-item.active .faq-question {
      background: #F8F9FA;
    }
    /* 终局 CTA */
    .cta-final {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: var(--white);
      text-align: center;
      padding: 80px 24px;
    }
    .cta-final h2 {
      font-size: 40px;
      font-weight: 700;
      margin-bottom: 16px;
      font-family: var(--font-head);
    }
    .cta-final p {
      font-size: 18px;
      margin-bottom: 32px;
      opacity: 0.9;
    }
    .btn-white {
      background: var(--white);
      color: var(--primary);
      padding: 16px 40px;
      font-weight: 700;
      border-radius: var(--radius-btn);
      transition: all 0.2s;
    }
    .btn-white:hover {
      background: var(--accent);
      color: var(--secondary);
    }
    /* 页脚 */
    .site-footer {
      background: var(--secondary);
      color: #F1FAEE;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer-brand p {
      margin-top: 12px;
      opacity: 0.8;
    }
    .footer-links h4 {
      margin-bottom: 16px;
      font-weight: 600;
    }
    .footer-links a {
      display: block;
      margin-bottom: 10px;
      opacity: 0.8;
      transition: color 0.2s;
    }
    .footer-links a:hover {
      color: var(--accent);
      opacity: 1;
    }
    .social-icons {
      display: flex;
      gap: 16px;
      margin-top: 12px;
    }
    .social-circle {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      border: 1px solid #F1FAEE;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: 0.2s;
    }
    .social-circle:hover {
      background: var(--accent);
      border-color: var(--accent);
      color: var(--secondary);
    }
    .copyright {
      margin-top: 40px;
      text-align: center;
      opacity: 0.7;
      font-size: 14px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }