/* roulang page: index */
:root {
      --primary-red: #E63946;
      --primary-red-hover: #C1121F;
      --deep-blue: #1D3557;
      --ice-white: #F1FAEE;
      --ice-cyan: #A8DADC;
      --charcoal: #2B2D42;
      --gray-blue: #8D99AE;
      --white: #FFFFFF;
      --light-bg: #FAFCFF;
      --border-light: rgba(29, 53, 87, 0.08);
      --shadow-card: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 28px rgba(29,53,87,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 4px;
      --max-width: 1280px;
      --section-gap: 120px;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: "Oswald", "DIN Alternate", "Bebas Neue", sans-serif;
      --font-brand: "Montserrat", "Poppins", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      font-size: 16px;
      font-weight: 400;
      line-height: 1.75;
      color: var(--charcoal);
      background-color: var(--white);
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--border-light);
      z-index: 1000;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      height: 72px;
    }
    .nav-left, .nav-right {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-left a, .nav-right a {
      font-weight: 500;
      color: var(--charcoal);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-left a:hover, .nav-right a:hover {
      color: var(--primary-red);
    }
    .nav-left a.active, .nav-right a.active {
      color: var(--primary-red);
    }
    .nav-left a.active::after, .nav-right a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--primary-red);
      border-radius: 2px;
    }
    .logo {
      font-family: var(--font-brand);
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
      color: var(--deep-blue);
      white-space: nowrap;
    }
    .logo span {
      color: var(--primary-red);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--deep-blue);
      cursor: pointer;
    }
    @media (max-width: 1024px) {
      .nav-left, .nav-right {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .nav-container {
        justify-content: space-between;
      }
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(16px);
      padding: 24px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.05);
      z-index: 999;
      flex-direction: column;
      gap: 20px;
    }
    .mobile-menu a {
      font-size: 18px;
      font-weight: 500;
      padding: 12px 0;
      border-bottom: 1px solid var(--border-light);
      color: var(--charcoal);
    }
    .mobile-menu a:hover {
      color: var(--primary-red);
    }
    .show-mobile {
      display: flex;
    }
    /* 按钮系统 */
    .btn-primary {
      background: var(--primary-red);
      color: white;
      border: none;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s;
      box-shadow: 0 4px 12px rgba(230,57,70,0.2);
    }
    .btn-primary:hover {
      background: var(--primary-red-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(230,57,70,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--deep-blue);
      color: var(--deep-blue);
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: var(--deep-blue);
      color: white;
    }
    .btn-lg {
      padding: 18px 48px;
      font-size: 18px;
    }
    /* Hero */
    .hero {
      background: radial-gradient(circle at 30% 40%, rgba(230,57,70,0.15) 0%, var(--deep-blue) 90%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      margin-top: 72px;
    }
    .hero-bg-img {
      position: absolute;
      right: 0;
      top: 0;
      width: 50%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.3;
      mask-image: linear-gradient(to left, black 30%, transparent);
      -webkit-mask-image: linear-gradient(to left, black 30%, transparent);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 650px;
      padding: 80px 0;
    }
    .hero h1 {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 3.5rem;
      line-height: 1.2;
      color: white;
      margin-bottom: 24px;
    }
    .hero .subtitle {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 40px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    @media (max-width: 768px) {
      .hero h1 { font-size: 2.2rem; }
      .hero-actions .btn { width: 100%; }
      .hero-bg-img { width: 100%; opacity: 0.15; }
    }
    /* 通用板块 */
    section {
      padding: var(--section-gap) 0;
    }
    @media (max-width: 1024px) { section { padding: 80px 0; } }
    @media (max-width: 640px) { section { padding: 64px 0; } }
    .section-title {
      font-family: var(--font-heading);
      font-weight: 600;
      font-size: 2.2rem;
      margin-bottom: 16px;
      color: var(--deep-blue);
    }
    .section-sub {
      color: var(--gray-blue);
      margin-bottom: 48px;
    }
    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .pain-card {
      background: var(--ice-white);
      border-radius: var(--radius-card);
      display: flex;
      overflow: hidden;
      border-left: 6px solid var(--primary-red);
    }
    .pain-img {
      width: 160px;
      background: #e9eef2 url('/assets/images/coverpic/cover-2.webp') center/cover no-repeat;
    }
    .pain-text {
      padding: 28px;
    }
    .pain-text h3 { font-weight: 600; margin-bottom: 12px; }
    @media (max-width: 768px) {
      .pain-grid { grid-template-columns: 1fr; }
      .pain-card { flex-direction: column; }
      .pain-img { height: 180px; width: 100%; }
    }
    /* 解决方案 中心辐射 */
    .solution-center {
      display: flex;
      flex-direction: column;
      align-items: center;
    }
    .hub {
      width: 120px;
      height: 120px;
      background: var(--deep-blue);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 1.25rem;
      margin-bottom: 40px;
      box-shadow: 0 12px 28px rgba(29,53,87,0.3);
    }
    .service-nodes {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 24px;
      max-width: 800px;
    }
    .node {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 20px 28px;
      display: flex;
      align-items: center;
      gap: 14px;
      box-shadow: var(--shadow-card);
    }
    .node i { color: var(--primary-red); font-size: 1.8rem; }
    @media (max-width: 640px) {
      .service-nodes { flex-direction: column; width: 100%; }
    }
    /* 成果数据 */
    .stats {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 32px;
      margin-bottom: 48px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 3.5rem;
      color: var(--primary-red);
      font-weight: 700;
    }
    .compare-bar {
      display: flex;
      align-items: center;
      gap: 24px;
      background: #f0f4f8;
      padding: 24px;
      border-radius: var(--radius-card);
    }
    .bar-old { height: 12px; width: 100px; background: #ccc; border-radius: 6px; }
    .bar-new { height: 12px; width: 240px; background: var(--primary-red); border-radius: 6px; }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .testimonial {
      background: #f9fbfd;
      padding: 32px;
      border-radius: var(--radius-card);
      position: relative;
    }
    .testimonial::before {
      content: "“";
      font-size: 4rem;
      color: var(--ice-cyan);
      opacity: 0.3;
      position: absolute;
      top: -10px;
      left: 16px;
    }
    .user-info { display: flex; align-items: center; gap: 12px; margin-top: 20px; }
    .avatar { width: 48px; height: 48px; background: #ddd; border-radius: 50%; background-image: url('/assets/images/coverpic/cover-1.webp'); background-size: cover; }
    @media (max-width: 768px) { .testimonial-grid { grid-template-columns: 1fr; } }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--gray-blue);
    }
    .faq-item.open .faq-answer { max-height: 200px; padding-top: 12px; }
    /* CTA 横幅 */
    .cta-banner {
      background: var(--deep-blue);
      text-align: center;
      padding: 80px 24px;
      color: white;
    }
    .pulse-anim:hover { animation: pulse 1s infinite; }
    @keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(230,57,70,0.5); } 70% { box-shadow: 0 0 0 15px rgba(230,57,70,0); } 100% { box-shadow: 0 0 0 0 rgba(230,57,70,0); } }
    /* 页脚 */
    .footer {
      background: var(--charcoal);
      color: var(--gray-blue);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer a:hover { color: var(--primary-red); }
    @media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; } }