/* roulang page: index */
:root {
      --primary: #E35205;
      --primary-hover: #C44704;
      --primary-soft: #FFF0E8;
      --dark: #1A1A2E;
      --warm-bg: #F5F0E8;
      --accent: #00C9A7;
      --surface: #FFFFFF;
      --gray-light: #E8E4DF;
      --text-main: #1A1A2E;
      --text-secondary: #4A4A5A;
      --text-on-dark: #FFFFFF;
      --form-bg: #FAF9F7;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-sm: 0 2px 12px rgba(26, 26, 46, 0.06);
      --shadow-md: 0 8px 24px rgba(26, 26, 46, 0.10);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-mono: "DIN Alternate", "Roboto Mono", "Courier New", monospace;
      --transition: 0.2s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-bg);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      scroll-behavior: smooth;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      color: inherit;
      text-decoration: none;
    }
    /* 按钮体系 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-btn);
      transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
      cursor: pointer;
      border: none;
      font-family: inherit;
      font-size: 1rem;
      padding: 0.75rem 1.75rem;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 10px rgba(227, 82, 5, 0.3);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: scale(1.02);
      box-shadow: 0 6px 16px rgba(227, 82, 5, 0.4);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 0.65rem 1.7rem;
    }
    .btn-outline:hover {
      background: var(--primary-soft);
      border-color: var(--primary-hover);
      color: var(--primary-hover);
    }
    .text-link {
      color: var(--primary);
      font-weight: 500;
      transition: color var(--transition), text-decoration var(--transition);
    }
    .text-link:hover {
      text-decoration: underline;
      color: var(--primary-hover);
    }
    /* 头部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--dark);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid rgba(255,255,255,0.1);
      transition: background var(--transition);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 68px;
      color: white;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 1px;
    }
    .logo-icon {
      width: 34px;
      height: 34px;
      background: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
    }
    .logo-icon::before {
      content: "⚡";
      font-size: 1.4rem;
      color: white;
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
      transform: rotate(15deg);
    }
    .nav-links {
      display: flex;
      gap: 1.8rem;
      font-weight: 500;
    }
    .nav-links a {
      position: relative;
      padding: 4px 0;
      color: #ddd;
      transition: color var(--transition);
      font-size: 1rem;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: white;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .menu-toggle span {
      width: 24px;
      height: 2px;
      background: white;
      border-radius: 2px;
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--dark);
        flex-direction: column;
        padding: 20px 24px;
        gap: 1.2rem;
        display: none;
        border-bottom: 2px solid var(--primary);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: flex;
      }
      .header-inner {
        height: 64px;
      }
    }
    /* HERO */
    #hero {
      background: var(--warm-bg);
      position: relative;
      overflow: hidden;
      padding: 80px 0;
    }
    #hero .hero-blob {
      position: absolute;
      top: -90px;
      right: -60px;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(227,82,5,0.18) 0%, rgba(245,240,232,0) 75%);
      border-radius: 50%;
      pointer-events: none;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-text {
      flex: 1 1 50%;
    }
    .hero-image {
      flex: 1 1 50%;
      position: relative;
      border-radius: 20px;
      overflow: hidden;
    }
    .hero-image img {
      border-radius: 16px;
      box-shadow: var(--shadow-md);
    }
    .hero-text h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.2rem;
      color: var(--dark);
    }
    .hero-highlight {
      color: var(--primary);
    }
    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }
    .hero-cta {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .data-badge-overlay {
      position: absolute;
      bottom: 18px;
      left: 18px;
      background: rgba(26,26,46,0.8);
      backdrop-filter: blur(12px);
      padding: 1rem 1.4rem;
      border-radius: 14px;
      display: flex;
      gap: 20px;
      color: white;
    }
    .data-badge-overlay div {
      text-align: center;
    }
    .data-badge-overlay span {
      display: block;
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--accent);
      font-family: var(--font-mono);
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      #hero {
        padding: 50px 0;
      }
      .hero-text h1 {
        font-size: 2.2rem;
      }
      .hero-cta {
        justify-content: center;
      }
    }
    /* 数据看板 */
    .dashboard {
      background: var(--dark);
      padding: 5rem 0;
    }
    .dash-title {
      color: white;
      font-size: 2rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 3rem;
    }
    .dash-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .dash-card {
      background: rgba(255,255,255,0.06);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      text-align: center;
      color: white;
      backdrop-filter: blur(6px);
      transition: background var(--transition);
    }
    .dash-value {
      font-family: var(--font-mono);
      font-size: 2.6rem;
      font-weight: 700;
      color: var(--accent);
      position: relative;
      display: inline-block;
    }
    .dash-value::after {
      content: '';
      position: absolute;
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      right: -16px;
      top: 8px;
      box-shadow: 0 0 8px var(--accent);
      animation: pulse 1.6s infinite;
    }
    @keyframes pulse {
      0% { opacity: 0.6; transform: scale(1); }
      50% { opacity: 1; transform: scale(1.3); }
      100% { opacity: 0.6; transform: scale(1); }
    }
    .dash-label {
      font-size: 0.9rem;
      opacity: 0.8;
      margin-top: 0.6rem;
    }
    @media (max-width: 768px) {
      .dash-grid { grid-template-columns: repeat(2, 1fr); }
      .dash-value { font-size: 2rem; }
    }
    /* 服务矩阵 */
    #services {
      padding: 5rem 0;
      background: white;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 3rem;
      color: var(--dark);
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.3s;
      overflow: hidden;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .service-img {
      height: 200px;
      overflow: hidden;
    }
    .service-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .service-body {
      padding: 22px;
    }
    .service-body h3 {
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 0.8rem;
    }
    @media (max-width: 640px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 对比 */
    #compare {
      background: var(--warm-bg);
      padding: 5rem 0;
    }
    .compare-wrapper {
      display: flex;
      gap: 30px;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
    }
    .compare-card {
      flex: 1;
      min-width: 250px;
      padding: 2rem;
      border-radius: var(--radius-card);
      background: white;
    }
    .compare-old {
      border-left: 6px solid #ccc;
      background: #f2f0ed;
    }
    .compare-new {
      border-left: 6px solid var(--primary);
      background: white;
      box-shadow: 0 0 0 2px var(--primary);
    }
    .compare-card h3 {
      font-weight: 700;
      margin-bottom: 1rem;
    }
    .check-green {
      color: var(--accent);
      margin-right: 8px;
    }
    .cross {
      color: #999;
      margin-right: 8px;
      text-decoration: line-through;
    }
    @media (max-width: 640px) {
      .compare-wrapper { flex-direction: column; }
    }
    /* FAQ */
    #faq {
      padding: 5rem 0;
      background: white;
    }
    .faq-item {
      background: var(--warm-bg);
      border-left: 4px solid var(--primary);
      border-radius: 8px;
      margin-bottom: 16px;
      transition: border-width var(--transition);
      padding: 1.2rem;
      cursor: pointer;
    }
    .faq-item:hover {
      border-left-width: 8px;
    }
    .faq-question {
      font-weight: 700;
    }
    .faq-answer {
      color: var(--text-secondary);
      margin-top: 10px;
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    /* 联系 */
    #contact {
      background: var(--form-bg);
      padding: 5rem 0;
    }
    .contact-layout {
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
    }
    .contact-left {
      flex: 1;
    }
    .contact-right {
      flex: 1;
      background: white;
      padding: 2rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }
    .form-input {
      width: 100%;
      padding: 12px;
      margin-bottom: 16px;
      border: 1px solid var(--gray-light);
      border-radius: var(--radius-input);
      background: white;
    }
    .form-input:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(227,82,5,0.15);
    }
    @media (max-width: 640px) {
      .contact-layout { flex-direction: column; }
    }
    .footer {
      background: var(--dark);
      color: #ccc;
      padding: 3rem 0 1.5rem;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 2rem;
    }