/* roulang page: index */
:root {
      --green-deep: #0A3D2E;
      --gold-champagne: #D4AF37;
      --warm-white: #FAF9F6;
      --soft-gray: #F4F4F0;
      --text-dark: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #8A8A8A;
      --vivid-orange: #E85D04;
      --border-light: #E0E0DA;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 25px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 30px rgba(0,0,0,0.08);
      --radius-card: 8px;
      --radius-btn: 4px;
      --transition: 0.25s ease;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--warm-white);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s, box-shadow 0.3s;
      background: transparent;
    }
    .navbar.scrolled {
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 15px rgba(0,0,0,0.05);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--warm-white);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
      transition: color 0.3s;
    }
    .navbar.scrolled .logo {
      color: var(--green-deep);
    }
    .logo-icon {
      color: var(--gold-champagne);
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      text-decoration: none;
      font-weight: 500;
      color: var(--warm-white);
      transition: color 0.3s;
      font-size: 16px;
      position: relative;
      padding-bottom: 4px;
    }
    .navbar.scrolled .nav-links a {
      color: var(--text-dark);
    }
    .nav-links a:hover {
      color: var(--gold-champagne);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--gold-champagne);
      transition: width 0.25s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-cta-nav {
      background: var(--gold-champagne);
      color: var(--green-deep);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: background 0.25s, color 0.25s, transform 0.2s;
      border: none;
      cursor: pointer;
      font-size: 16px;
      display: inline-block;
    }
    .navbar.scrolled .btn-cta-nav {
      background: var(--gold-champagne);
      color: var(--green-deep);
    }
    .btn-cta-nav:hover {
      background: var(--green-deep);
      color: var(--gold-champagne);
      transform: scale(1.03);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 28px;
      height: 2px;
      background: var(--warm-white);
      transition: 0.3s;
      border-radius: 2px;
    }
    .navbar.scrolled .hamburger span {
      background: var(--green-deep);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(rgba(10,61,46,0.75), rgba(10,61,46,0.8)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: white;
      padding-top: 72px;
    }
    .hero-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      flex-wrap: wrap;
      width: 100%;
    }
    .hero-left {
      flex: 1 1 500px;
    }
    .hero-right {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-abstract {
      width: 100%;
      height: 300px;
      position: relative;
    }
    .flow-line {
      position: absolute;
      width: 100%;
      height: 100%;
    }
    .hero h1 {
      font-size: clamp(36px, 5vw, 60px);
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
      color: white;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 20px;
      opacity: 0.9;
      margin-bottom: 16px;
      color: rgba(255,255,255,0.9);
    }
    .hero-pain {
      font-size: 18px;
      color: var(--gold-champagne);
      margin-bottom: 32px;
      border-left: 4px solid var(--gold-champagne);
      padding-left: 20px;
    }
    .btn-primary {
      background: var(--gold-champagne);
      color: var(--green-deep);
      padding: 14px 40px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      text-decoration: none;
      display: inline-block;
      transition: background 0.25s, color 0.25s, transform 0.2s;
      border: none;
      font-size: 18px;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: var(--green-deep);
      color: var(--gold-champagne);
      transform: scale(1.03);
    }

    /* 通用 section */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: clamp(30px, 4vw, 40px);
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 16px;
      text-align: center;
    }
    .gold-line {
      width: 48px;
      height: 3px;
      background: var(--gold-champagne);
      margin: 0 auto 48px;
    }

    /* 痛点解决方案 */
    .solutions-grid {
      display: flex;
      gap: 60px;
      align-items: flex-start;
      flex-wrap: wrap;
      margin-top: 40px;
    }
    .pain-col, .solution-col {
      flex: 1 1 400px;
    }
    .pain-item, .solution-item {
      display: flex;
      gap: 16px;
      margin-bottom: 32px;
      background: white;
      padding: 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .pain-item {
      border-left: 4px solid #E85D04;
      background: #FFF9F5;
    }
    .solution-item {
      border-left: 4px solid var(--green-deep);
    }
    .pain-item:hover, .solution-item:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .pain-icon, .solution-icon {
      font-size: 28px;
      color: var(--gold-champagne);
    }

    /* 数据展示 */
    .data-section {
      background: var(--green-deep);
      color: white;
    }
    .data-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 40px;
    }
    .data-item {
      text-align: center;
    }
    .data-number {
      font-family: "DIN Alternate", "Roboto", sans-serif;
      font-size: 64px;
      font-weight: 700;
      color: var(--gold-champagne);
    }
    .data-desc {
      color: rgba(255,255,255,0.8);
      margin-top: 8px;
    }

    /* 证言 */
    .testimonials-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 30px;
      justify-content: center;
      margin-top: 40px;
    }
    .testimonial-card {
      background: white;
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      flex: 1 1 280px;
      max-width: 380px;
      position: relative;
      transition: var(--transition);
    }
    .testimonial-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-6px);
    }
    .quote-mark {
      font-size: 48px;
      color: var(--gold-champagne);
      opacity: 0.4;
      line-height: 1;
    }
    .testimonial-avatar {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      border: 2px solid var(--gold-champagne);
      margin-bottom: 16px;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      color: var(--green-deep);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 18px;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-body);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-band {
      background: var(--green-deep);
      padding: 80px 0;
      text-align: center;
    }

    /* Footer */
    .footer {
      background: var(--green-deep);
      color: #ccc;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 40px;
      justify-content: space-between;
    }
    .footer-col {
      flex: 1 1 200px;
    }
    .footer a {
      color: #aaa;
      text-decoration: none;
      transition: color 0.3s;
    }
    .footer a:hover {
      color: var(--gold-champagne);
    }
    .copyright {
      text-align: center;
      margin-top: 40px;
      color: #888;
      font-size: 14px;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(10,61,46,0.98);
        padding: 24px;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .hero-container {
        flex-direction: column;
        text-align: center;
      }
      .hero-pain {
        border-left: none;
        padding-left: 0;
      }
      section {
        padding: 60px 0;
      }
    }