/* roulang page: index */
:root {
      --primary: #2D8C4E;
      --primary-deep: #237040;
      --primary-soft: rgba(45, 140, 78, 0.08);
      --secondary: #3A3F44;
      --accent-gold: #F0B823;
      --accent-red: #D94E34;
      --bg-body: #F4F7F5;
      --bg-white: #FFFFFF;
      --text-dark: #1F2937;
      --text-body: #374151;
      --text-weak: #6B7280;
      --text-muted: #9CA3AF;
      --border-light: #E5E7EB;
      --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.06);
      --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.10);
      --radius-lg: 16px;
      --radius-xl: 20px;
      --radius-full: 50%;
      --max-width: 1280px;
      --space-sm: 16px;
      --space-md: 24px;
      --space-lg: 48px;
      --space-xl: 72px;
      font-family: 'Inter', 'MiSans', 'PingFang SC', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    }

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

    body {
      background-color: var(--bg-body);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      font-weight: 400;
      overflow-x: hidden;
    }

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

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

    ul {
      list-style: none;
    }

    button, .btn {
      cursor: pointer;
      border: none;
      background: none;
      font-family: inherit;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(229, 231, 235, 0.5);
      padding: 12px 0;
      transition: background 0.25s, box-shadow 0.25s;
    }

    .navbar.scrolled {
      background: rgba(255, 255, 255, 0.98);
      box-shadow: 0 2px 12px rgba(0,0,0,0.05);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 var(--space-md);
    }

    .logo-area {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

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

    .logo-domain {
      font-size: 13px;
      color: var(--text-weak);
      font-weight: 400;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
    }

    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-dark);
      transition: color 0.2s;
      position: relative;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s;
    }

    .nav-links a:hover {
      color: var(--primary);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 10px 24px;
      border-radius: 40px;
      font-weight: 600;
      box-shadow: 0 2px 8px rgba(45,140,78,0.25);
      transition: background 0.2s, transform 0.2s;
    }

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

    .mobile-nav {
      display: none;
    }

    /* 板块通用 */
    section {
      padding: var(--space-xl) 0;
    }

    .section-intro {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-intro h2 {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-dark);
    }

    .section-intro p {
      color: var(--text-weak);
      font-size: 18px;
      margin-top: 12px;
    }

    /* Hero */
    .hero {
      padding-top: 120px;
      padding-bottom: 72px;
      background: linear-gradient(180deg, #f0f6f3 0%, #F4F7F5 100%);
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }

    .hero-left {
      flex: 1.1;
    }

    .hero-left h1 {
      font-size: 48px;
      font-weight: 700;
      color: #1F2937;
      line-height: 1.3;
      margin-bottom: 20px;
    }

    .hero-left p {
      font-size: 18px;
      color: #4B5563;
      margin-bottom: 32px;
      max-width: 500px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 18px;
      box-shadow: 0 6px 16px rgba(45,140,78,0.25);
      transition: background 0.2s, transform 0.15s;
    }

    .btn-primary:hover {
      background: var(--primary-deep);
      transform: translateY(-2px);
    }

    .btn-secondary {
      border: 2px solid var(--secondary);
      color: var(--secondary);
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 18px;
      transition: all 0.2s;
    }

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

    .hero-right {
      flex: 0.9;
      background: var(--bg-white);
      border-radius: var(--radius-xl);
      overflow: hidden;
      box-shadow: var(--shadow-hover);
      position: relative;
      aspect-ratio: 4/3;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
    }

    .hero-right::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(45, 140, 78, 0.08);
      backdrop-filter: blur(1px);
    }

    /* Features 三列 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .feat-card {
      background: var(--bg-white);
      padding: 32px 28px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
    }

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

    .feat-icon {
      font-size: 32px;
      margin-bottom: 16px;
    }

    .feat-card h3 {
      font-size: 22px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 10px;
    }

    /* 服务矩阵 */
    .services-container {
      display: flex;
      gap: 32px;
    }

    .service-main {
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      flex: 1.4;
      transition: 0.25s;
    }

    .service-main:hover {
      box-shadow: var(--shadow-hover);
    }

    .service-main img {
      width: 100%;
      height: 240px;
      object-fit: cover;
    }

    .service-main-body {
      padding: 28px;
    }

    .service-side {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .service-card {
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      padding: 24px;
      display: flex;
      gap: 20px;
      align-items: center;
      box-shadow: var(--shadow-card);
      transition: 0.25s;
    }

    .service-card:hover {
      box-shadow: var(--shadow-hover);
    }

    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .highlight-card {
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: 0.25s;
    }

    .highlight-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .highlight-cover {
      height: 160px;
      background-size: cover;
    }

    .highlight-body {
      padding: 24px 20px;
    }

    .badge-pill {
      display: inline-block;
      background: var(--primary-soft);
      color: var(--primary);
      font-weight: 700;
      padding: 4px 16px;
      border-radius: 30px;
      font-size: 14px;
      margin-top: 12px;
    }

    /* 案例瀑布交替 */
    .case-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }

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

    .case-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .case-text {
      flex: 1;
    }

    /* 方案对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .plan-card {
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      border: 2px solid transparent;
      transition: 0.2s;
    }

    .plan-recommend {
      border-color: var(--primary);
      box-shadow: 0 8px 28px rgba(45,140,78,0.15);
    }

    .plan-recommend h4 {
      color: var(--primary);
    }

    /* FAQ */
    .faq-item {
      background: var(--bg-white);
      border-radius: 14px;
      margin-bottom: 12px;
      padding: 4px;
      box-shadow: 0 1px 4px rgba(0,0,0,0.02);
      border: 1px solid var(--border-light);
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 24px;
      cursor: pointer;
      font-weight: 600;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding: 0 24px;
    }

    /* CTA */
    .dark-cta {
      background: linear-gradient(135deg, #3A3F44 0%, #2C3035 100%);
      color: white;
      text-align: center;
      padding: 80px 0;
      border-radius: 0;
    }

    /* 页脚 */
    .footer {
      background: #2C3035;
      color: #D1D5DB;
      padding: 64px 0 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      text-align: center;
      padding: 24px;
      margin-top: 48px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; }
      .features-grid { grid-template-columns: 1fr 1fr; }
      .services-container { flex-direction: column; }
      .highlights-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-nav {
        display: flex;
        justify-content: space-around;
        background: white;
        position: fixed;
        bottom: 18px;
        left: 16px;
        right: 16px;
        padding: 10px 0;
        border-radius: 40px;
        box-shadow: 0 8px 30px rgba(0,0,0,0.12);
        z-index: 99;
      }
      .mobile-nav a {
        font-size: 13px;
        display: flex;
        flex-direction: column;
        align-items: center;
        padding: 6px 12px;
        font-weight: 600;
      }
      section { padding: 48px 0; }
      .hero { padding-top: 100px; }
      .compare-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .case-row, .case-reverse { flex-direction: column; }
    }