/* roulang page: index */
:root {
      --primary: #0A3D2E;
      --primary-hover: #0F4F3D;
      --accent: #00E5A0;
      --accent-light: rgba(0, 229, 160, 0.15);
      --bg: #F7F5F0;
      --card-bg: #FFFFFF;
      --text: #1A1A1A;
      --text-secondary: #5C5C5C;
      --text-on-dark: #FFFFFF;
      --border-light: #E5E0D8;
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-pill: 20px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
      --transition: 0.2s ease;
      --container-max: 1280px;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, -apple-system, sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border: none;
      outline: none;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 5vw;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
      body {
        font-size: 15px;
      }
    }

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--bg);
      border-bottom: 1px solid var(--border-light);
      backdrop-filter: blur(6px);
    }

    .nav-row-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 5vw;
      max-width: var(--container-max);
      margin: 0 auto;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .search-icon {
      width: 24px;
      height: 24px;
      color: var(--text-secondary);
      background: transparent;
      border: none;
      font-size: 20px;
      line-height: 1;
    }

    .btn-outline-sm {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 8px 18px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
    }

    .btn-outline-sm:hover {
      background: var(--primary);
      color: white;
    }

    .channels-bar {
      display: flex;
      gap: 8px;
      padding: 8px 5vw 12px;
      max-width: var(--container-max);
      margin: 0 auto;
      overflow-x: auto;
      white-space: nowrap;
      -webkit-overflow-scrolling: touch;
    }

    .channel-pill {
      background: var(--bg);
      color: var(--text-secondary);
      padding: 6px 18px;
      border-radius: var(--radius-pill);
      font-size: 15px;
      font-weight: 500;
      transition: var(--transition);
      border: 1px solid transparent;
    }

    .channel-pill:hover {
      background: var(--accent-light);
      color: var(--primary);
    }

    .channel-pill.active {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }

    .hamburger-menu {
      display: none;
    }

    @media (max-width: 768px) {
      .nav-row-top {
        padding: 12px 20px;
      }
      .channels-bar {
        padding: 8px 20px 12px;
      }
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      box-shadow: 0 4px 12px rgba(10,61,46,0.2);
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }

    .btn-ghost {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    .btn-ghost:hover {
      background: var(--primary);
      color: white;
    }

    .btn-giant {
      background: var(--accent);
      color: var(--primary);
      font-weight: 700;
      padding: 18px 48px;
      border-radius: 12px;
      font-size: 18px;
      box-shadow: 0 8px 22px rgba(0,229,160,0.3);
    }

    .btn-giant:hover {
      transform: scale(1.03);
      background: #00f0a8;
    }

    /* Hero */
    .hero {
      background: linear-gradient(180deg, #0A3D2E 0%, #062A20 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      display: flex;
      flex-direction: column;
      max-width: 700px;
      position: relative;
      z-index: 2;
    }

    .hero-badge {
      background: var(--accent);
      color: var(--primary);
      font-weight: 700;
      font-size: 14px;
      padding: 6px 18px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 24px;
      letter-spacing: 0.5px;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 20px;
      opacity: 0.9;
      margin-bottom: 36px;
      line-height: 1.6;
    }

    .floating-badge {
      position: absolute;
      right: 8%;
      bottom: 15%;
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(12px);
      border-radius: 16px;
      padding: 16px 24px;
      color: white;
      font-weight: 700;
    }

    .floating-badge span {
      color: var(--accent);
      font-size: 32px;
      display: block;
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 34px;
      }
      .floating-badge {
        right: 20px;
        bottom: 40px;
      }
    }

    /* 通用板块 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 48px;
      color: var(--primary);
    }

    .grid-3, .grid-4 {
      display: grid;
      gap: 24px;
    }

    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }

    @media (max-width: 1024px) {
      .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 640px) {
      .grid-3, .grid-4 { grid-template-columns: 1fr; }
    }

    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .icon-circle {
      width: 64px;
      height: 64px;
      background: rgba(10,61,46,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--accent);
      font-size: 28px;
    }

    .data-badge {
      background: var(--accent-light);
      color: var(--primary);
      font-weight: 700;
      font-size: 13px;
      padding: 4px 10px;
      border-radius: 20px;
    }

    /* 解决方案图文 */
    .solution-row {
      display: flex;
      gap: 40px;
      align-items: center;
      margin-bottom: 60px;
    }

    .solution-row.reverse {
      flex-direction: row-reverse;
    }

    .solution-img {
      flex: 1;
      background: #E5E0D8;
      border-radius: 16px;
      aspect-ratio: 16/9;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-secondary);
      font-weight: 600;
      background-size: cover;
      background-position: center;
    }

    .solution-text {
      flex: 1;
    }

    @media (max-width: 768px) {
      .solution-row, .solution-row.reverse {
        flex-direction: column;
      }
    }

    /* 滚动证言 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 16px;
    }

    .testimonial-card {
      min-width: 340px;
      background: white;
      border-radius: 16px;
      padding: 28px;
      scroll-snap-align: start;
      box-shadow: var(--shadow-sm);
    }

    .quote-line {
      border-left: 4px solid var(--accent);
      padding-left: 16px;
      font-style: italic;
      margin: 16px 0;
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .faq-item {
      background: var(--bg);
      border-radius: 8px;
      padding: 16px;
    }

    .faq-question {
      font-weight: 700;
      color: var(--primary);
      display: flex;
      justify-content: space-between;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: white;
      margin-top: 8px;
      padding: 0 16px;
      border-left: 3px solid var(--accent);
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 16px;
    }

    @media (max-width: 640px) {
      .faq-grid { grid-template-columns: 1fr; }
    }

    /* CTA final */
    .cta-final {
      background: linear-gradient(135deg, #0A3D2E, #00E5A0);
      padding: 80px 20px;
      text-align: center;
      color: white;
    }

    .trust-badges {
      display: flex;
      justify-content: center;
      gap: 20px;
      margin-top: 24px;
    }

    /* Footer */
    .footer {
      background: #0A3D2E;
      color: white;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    .copyright {
      text-align: center;
      opacity: 0.7;
      margin-top: 40px;
    }