/* roulang page: index */
:root {
      --primary: #E43D2A;
      --primary-dark: #C8311F;
      --primary-soft: rgba(228, 61, 42, 0.10);
      --secondary: #1A1D29;
      --accent: #F5A623;
      --bg-light: #F9FAFB;
      --bg-white: #FFFFFF;
      --text-main: #1A1D29;
      --text-muted: #6B7280;
      --text-placeholder: #9CA3AF;
      --success: #10B981;
      --border-light: #E5E7EB;
      --border-soft: rgba(0,0,0,0.06);
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 8px;
      --radius-btn: 6px;
      --radius-input: 4px;
      --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

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

    a {
      color: inherit;
      text-decoration: none;
    }

    button, input, textarea {
      font-family: inherit;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      height: 72px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-soft);
      transition: background 0.3s;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-weight: 700;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
      color: var(--text-main);
    }
    .logo span {
      font-style: italic;
      font-weight: 800;
      color: var(--primary);
      margin-right: 2px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-size: 1rem;
      font-weight: 500;
      color: var(--text-main);
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.3s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      transition: all 0.3s;
    }
    .menu-open .menu-toggle span:nth-child(1) {
      transform: rotate(45deg) translate(5px,5px);
    }
    .menu-open .menu-toggle span:nth-child(2) {
      opacity: 0;
    }
    .menu-open .menu-toggle span:nth-child(3) {
      transform: rotate(-45deg) translate(5px,-5px);
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(26,29,41,0.96);
        flex-direction: column;
        justify-content: center;
        gap: 32px;
        align-items: center;
        transform: translateX(100%);
        transition: transform 0.4s ease;
        z-index: 99;
      }
      .nav-links a {
        color: white;
        font-size: 1.4rem;
      }
      .menu-open .nav-links {
        transform: translateX(0);
      }
      .menu-toggle {
        display: flex;
        z-index: 101;
        position: relative;
      }
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 600px;
      background-color: var(--secondary);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      display: flex;
      align-items: center;
      color: white;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(26,29,41,0.78);
      backdrop-filter: blur(2px);
      z-index: 1;
    }
    .hero .container {
      position: relative;
      z-index: 2;
    }
    .hero-content {
      max-width: 700px;
    }
    .hero h1 {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 1.25rem;
    }
    .hero .subtitle {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 2.5rem;
      line-height: 1.6;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      transition: background 0.2s, box-shadow 0.2s;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 4px 14px rgba(228,61,42,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2.4rem;
      }
      .hero .subtitle {
        font-size: 1.1rem;
      }
      .btn-group {
        flex-direction: column;
        align-items: flex-start;
      }
    }

    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 2.5rem;
      text-align: center;
      color: var(--text-main);
    }

    /* 数据看板 */
    .data-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      text-align: center;
      transition: border-color 0.2s, transform 0.2s;
    }
    .stat-card:hover {
      border-color: var(--primary);
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .stat-number {
      font-size: 3.2rem;
      font-weight: 800;
      font-feature-settings: "tnum";
      background: linear-gradient(135deg, #E43D2A, #F5A623);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: inline-block;
    }
    .stat-label {
      color: var(--text-muted);
      font-size: 0.95rem;
      margin-top: 8px;
    }

    @media (max-width: 768px) {
      .data-grid {
        grid-template-columns: 1fr;
      }
      .stat-number {
        font-size: 2.8rem;
      }
    }

    /* 服务体系 非对称网格 */
    .service-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .service-large {
      background: var(--secondary);
      color: white;
      border-radius: var(--radius-card);
      padding: 40px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      background-image: url('/assets/images/coverpic/cover-2.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
    }
    .service-large::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(26,29,41,0.7);
    }
    .service-large > * {
      position: relative;
      z-index: 1;
    }
    .service-medium {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 28px;
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
    }
    .service-medium:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .service-title {
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .service-desc {
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
      margin-bottom: 16px;
    }
    .service-link {
      margin-top: auto;
      color: var(--primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .right-stack {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    @media (max-width: 768px) {
      .service-grid {
        grid-template-columns: 1fr;
      }
      .service-large {
        min-height: 240px;
      }
    }

    /* 对比区 */
    .comparison-wrapper {
      background: #F3F4F6;
      border-radius: var(--radius-card);
      display: grid;
      grid-template-columns: 1fr 1fr;
      position: relative;
      overflow: hidden;
      min-height: 320px;
    }
    .before, .after {
      padding: 40px;
    }
    .before {
      background: #F9FAFB;
      color: #9CA3AF;
    }
    .after {
      background: white;
      border-left: 2px dashed var(--border-light);
    }
    .before h3, .after h3 {
      font-size: 1.6rem;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .after h3 {
      color: var(--primary);
    }
    .list-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
      font-size: 1rem;
    }
    .after .list-item {
      color: var(--text-main);
      font-weight: 600;
    }
    .icon-fail {
      color: #9CA3AF;
      font-weight: bold;
    }
    .icon-success {
      color: var(--success);
      font-weight: bold;
    }

    @media (max-width: 768px) {
      .comparison-wrapper {
        grid-template-columns: 1fr;
      }
      .after {
        border-left: none;
        border-top: 2px dashed var(--border-light);
      }
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-main);
    }
    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: #4B5563;
      font-size: 0.95rem;
      line-height: 1.8;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    /* 表单 */
    .contact-form {
      background: var(--bg-white);
      padding: 48px;
      border-radius: var(--radius-card);
      box-shadow: inset 0 1px 0 rgba(0,0,0,0.04);
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: center;
    }
    .form-fields {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .input-line {
      border: none;
      border-bottom: 1px solid #D1D5DB;
      padding: 12px 4px;
      font-size: 1rem;
      background: transparent;
      transition: border-color 0.2s;
    }
    .input-line:focus {
      outline: none;
      border-bottom: 2px solid var(--primary);
    }
    .contact-info {
      color: var(--text-muted);
      font-size: 0.9rem;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    @media (max-width: 768px) {
      .contact-form {
        grid-template-columns: 1fr;
        padding: 28px;
      }
    }

    /* 页脚 */
    .site-footer {
      background: var(--secondary);
      color: #9CA3AF;
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 32px;
    }
    .footer-links a {
      display: block;
      margin-bottom: 8px;
      color: #9CA3AF;
      transition: color 0.2s;
    }
    .footer-links a:hover {
      color: white;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 20px;
      text-align: center;
      font-size: 0.8rem;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
    }