/* roulang page: index */
:root {
      --color-primary: #0A4D2E;
      --color-primary-light: #0d6b3f;
      --color-accent: #F5A623;
      --color-accent-hover: #e09610;
      --color-bg: #F9FAFB;
      --color-surface: #FFFFFF;
      --color-dark: #0A2E1F;
      --color-text: #1F2937;
      --color-text-secondary: #6B7280;
      --color-border: #E5E7EB;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "Inter", "Roboto", "SF Mono", monospace;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-card: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 24px rgba(0,0,0,0.08);
      --transition: all 0.25s ease;
      --max-width: 1280px;
      --header-height: 76px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      padding-top: var(--header-height);
    }

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

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

    button, input, select {
      font-family: inherit;
      font-size: inherit;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(229,231,235,0.6);
      z-index: 100;
      display: flex;
      align-items: center;
      transition: background 0.3s;
    }

    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }

    .logo-icon {
      width: 42px;
      height: 42px;
      background: var(--color-primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      background-image: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.2) 1px, transparent 1px);
      background-size: 8px 8px;
      box-shadow: 0 2px 6px rgba(10,77,46,0.3);
    }

    .logo-icon::after {
      content: "";
      position: absolute;
      width: 18px;
      height: 18px;
      background: var(--color-accent);
      border-radius: 50%;
      bottom: 4px;
      right: 4px;
      box-shadow: 0 0 0 2px white;
    }

    .logo-text {
      font-weight: 700;
      font-size: 22px;
      color: var(--color-primary);
      letter-spacing: 0.5px;
      line-height: 1.2;
    }

    .logo-domain {
      font-size: 11px;
      color: var(--color-text-secondary);
      display: block;
      font-weight: 400;
      letter-spacing: 0.3px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 6px;
      background: #F3F4F6;
      padding: 5px;
      border-radius: 40px;
    }

    .nav-link {
      padding: 8px 18px;
      border-radius: 30px;
      font-size: 15px;
      font-weight: 500;
      color: var(--color-text-secondary);
      transition: var(--transition);
      white-space: nowrap;
    }

    .nav-link.active {
      background: var(--color-primary);
      color: white;
      box-shadow: 0 2px 8px rgba(10,77,46,0.25);
    }

    .nav-link:hover:not(.active) {
      color: var(--color-primary);
      background: rgba(10,77,46,0.05);
    }

    .header-cta {
      background: var(--color-accent);
      color: white;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 30px;
      font-size: 15px;
      box-shadow: 0 4px 10px rgba(245,166,35,0.3);
      transition: var(--transition);
      white-space: nowrap;
      border: none;
      cursor: pointer;
    }

    .header-cta:hover {
      background: var(--color-accent-hover);
      box-shadow: 0 6px 14px rgba(245,166,35,0.4);
      transform: translateY(-1px);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--color-primary);
      cursor: pointer;
      padding: 6px;
    }

    @media (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .header-cta.desktop {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: var(--header-height);
      left: 0;
      width: 100%;
      background: white;
      border-bottom: 1px solid var(--color-border);
      flex-direction: column;
      padding: 16px 24px;
      gap: 8px;
      z-index: 99;
      box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    }

    .mobile-menu.active {
      display: flex;
    }

    .mobile-menu .nav-link {
      display: block;
      padding: 12px 16px;
      border-radius: 30px;
      background: #F9FAFB;
    }

    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      min-height: calc(100vh - var(--header-height));
      padding: 40px 0;
      background: linear-gradient(135deg, #f0f9f4 0%, #ffffff 100%);
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      right: -50px;
      top: -50px;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(10,77,46,0.03) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }

    .hero .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-title {
      font-size: 44px;
      line-height: 1.25;
      font-weight: 700;
      color: #0A2E1F;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--color-text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--color-primary);
      color: white;
      padding: 14px 32px;
      border-radius: 30px;
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(10,77,46,0.3);
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-primary:hover {
      background: var(--color-primary-light);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(10,77,46,0.4);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--color-primary);
      color: var(--color-primary);
      padding: 14px 32px;
      border-radius: 30px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      font-size: 16px;
    }

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

    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      height: 360px;
      position: relative;
      box-shadow: 0 20px 40px rgba(0,0,0,0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .hero-overlay {
      background: rgba(10,46,31,0.7);
      backdrop-filter: blur(2px);
      width: 100%;
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 32px;
      font-weight: 700;
      flex-direction: column;
      gap: 8px;
    }

    .dynamic-number {
      font-size: 52px;
      font-weight: 800;
      color: var(--color-accent);
      font-family: var(--font-mono);
    }

    @media (max-width: 768px) {
      .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-sub { max-width: 100%; }
      .hero-visual { height: 280px; }
      .hero-title { font-size: 36px; }
    }

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

    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      color: #0A2E1F;
    }

    .section-sub {
      color: var(--color-text-secondary);
      margin-bottom: 48px;
      font-size: 18px;
    }

    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .stat-card {
      background: white;
      padding: 28px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      border: 1px solid var(--color-border);
      transition: var(--transition);
      text-align: center;
    }

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

    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--color-accent);
      font-family: var(--font-mono);
    }

    /* 服务1+2 */
    .services-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }

    .service-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--color-border);
      transition: var(--transition);
    }

    .service-card.large {
      background: linear-gradient(145deg, #ffffff 0%, #f6fdf9 100%);
    }

    .service-icon {
      font-size: 36px;
      color: var(--color-primary);
      margin-bottom: 16px;
    }

    .right-stack {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

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

    /* 对比 */
    .compare-wrapper {
      display: flex;
      gap: 24px;
      align-items: center;
      position: relative;
    }

    .compare-col {
      flex: 1;
      background: white;
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-card);
    }

    .compare-col.bad {
      background: #f9fafb;
      color: #9CA3AF;
      text-decoration: line-through;
    }

    .compare-col.good {
      border: 2px solid var(--color-primary);
      background: #f6fdf9;
    }

    @media (max-width: 768px) {
      .compare-wrapper {
        flex-direction: column;
      }
    }

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

    .faq-item {
      background: white;
      border-radius: var(--radius-sm);
      padding: 20px;
      border: 1px solid var(--color-border);
    }

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

    /* 联系表单 */
    .contact-dark {
      background: var(--color-dark);
      color: white;
      border-radius: 24px;
      padding: 56px 48px;
      margin-top: 40px;
    }

    .form-input {
      width: 100%;
      padding: 14px;
      border-radius: 30px;
      border: 1px solid rgba(255,255,255,0.3);
      background: rgba(255,255,255,0.1);
      color: white;
      margin-bottom: 16px;
    }

    .footer {
      background: #0A2E1F;
      color: #ccc;
      padding: 40px 0 20px;
    }

    @media (max-width: 520px) {
      .hero-title { font-size: 28px; }
      section { padding: 60px 0; }
    }