/* roulang page: index */
:root {
      --primary: #1A1A2E;
      --accent-one: #E94560;
      --accent-two: #0F3460;
      --bg: #FAFAFA;
      --card-bg: #FFFFFF;
      --alt-bg: #F0F0F5;
      --text-heading: #1A1A2E;
      --text-body: #3A3A4A;
      --text-muted: #6B6B7B;
      --border-light: #E0E0E8;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 24px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-eng: "Inter", system-ui, -apple-system, sans-serif;
      --section-gap: 80px;
      --section-gap-mobile: 48px;
      --grid-width: 1200px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-family: var(--font-sans);
      color: var(--text-heading);
      font-weight: 700;
      margin-top: 0;
      line-height: 1.3;
    }

    h1 {
      font-size: 42px;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 32px;
      margin-bottom: 1.5rem;
    }

    h3 {
      font-size: 20px;
      font-weight: 600;
      line-height: 1.4;
    }

    p {
      font-size: 16px;
      color: var(--text-body);
      margin-bottom: 1.5em;
    }

    .text-muted {
      color: var(--text-muted);
      font-size: 14px;
    }

    a {
      color: var(--accent-two);
      transition: color 0.2s;
      text-decoration: none;
    }
    a:hover {
      color: var(--accent-one);
    }

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

    .container {
      max-width: var(--grid-width);
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 按钮系统 */
    .btn {
      display: inline-block;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      text-align: center;
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
      font-size: 16px;
      font-family: var(--font-sans);
      text-decoration: none;
      line-height: 1.2;
    }
    .btn-primary {
      background-color: var(--accent-one);
      color: #fff;
      box-shadow: 0 4px 12px rgba(233,69,96,0.25);
    }
    .btn-primary:hover {
      background-color: #d63e56;
      box-shadow: 0 8px 20px rgba(233,69,96,0.4);
      color: #fff;
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-two);
      color: var(--accent-two);
    }
    .btn-outline:hover {
      background: var(--accent-two);
      color: #fff;
      border-color: var(--accent-two);
    }
    .btn-link {
      background: none;
      border: none;
      padding: 0;
      color: var(--accent-one);
      font-weight: 600;
      text-decoration: underline;
      text-underline-offset: 4px;
    }
    .btn-link:hover {
      color: var(--accent-two);
      text-decoration: underline;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      z-index: 100;
      padding: 16px 0;
      border-bottom: 1px solid rgba(0,0,0,0.02);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--grid-width);
      margin: 0 auto;
      padding: 0 20px;
      flex-wrap: wrap;
    }
    .logo {
      font-family: var(--font-eng);
      font-size: 22px;
      font-weight: 700;
      color: var(--accent-one);
      letter-spacing: -0.3px;
      white-space: nowrap;
    }
    .logo span {
      font-weight: 400;
      color: var(--primary);
    }
    .search-box {
      position: relative;
      width: 320px;
      margin: 0 24px;
    }
    .search-box input {
      width: 100%;
      padding: 10px 20px 10px 44px;
      border-radius: var(--radius-pill);
      border: 1px solid var(--border-light);
      background: #fff;
      font-size: 14px;
      font-family: var(--font-sans);
      outline: none;
      transition: all 0.2s;
      color: var(--text-body);
    }
    .search-box input:focus {
      border-color: var(--accent-one);
      box-shadow: 0 0 0 3px rgba(233,69,96,0.15);
    }
    .search-box .search-icon {
      position: absolute;
      left: 16px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--accent-one);
      font-size: 16px;
    }
    .nav-links {
      display: flex;
      gap: 24px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--accent-one);
    }
    .hamburger {
      display: none;
      font-size: 24px;
      background: none;
      border: none;
      color: var(--primary);
      cursor: pointer;
    }

    /* 卡片基础 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
      padding: 24px;
    }
    .card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }

    /* 区块间距 */
    section {
      padding-top: var(--section-gap);
      padding-bottom: var(--section-gap);
    }

    /* Hero */
    .hero {
      background: var(--primary);
      color: #fff;
      padding-top: 140px;
      padding-bottom: 100px;
      position: relative;
      overflow: hidden;
    }
    .hero::after {
      content: '';
      position: absolute;
      right: -20%;
      top: -20%;
      width: 60%;
      height: 140%;
      background: radial-gradient(circle, rgba(233,69,96,0.25) 0%, transparent 70%);
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 680px;
    }
    .hero h1 {
      color: #fff;
      font-size: 42px;
      line-height: 1.3;
      margin-bottom: 20px;
    }
    .hero .subtitle {
      color: rgba(255,255,255,0.8);
      font-size: 18px;
      max-width: 560px;
      margin-bottom: 32px;
    }
    .hero-illustration {
      position: absolute;
      right: 0;
      bottom: 0;
      width: 45%;
      z-index: 1;
      opacity: 0.9;
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .pain-item {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
    }
    .pain-item:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-3px);
    }
    .pain-icon {
      font-size: 36px;
      color: var(--accent-one);
      margin-bottom: 16px;
    }

    /* 解决方案交替图文 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
      flex-wrap: wrap;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-text {
      flex: 5;
      min-width: 280px;
    }
    .solution-img {
      flex: 7;
      min-width: 280px;
    }
    .solution-img img {
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      width: 100%;
    }

    /* 成果数字 */
    .stats-row {
      display: flex;
      justify-content: space-around;
      text-align: center;
      background: var(--alt-bg);
      padding: 60px 0;
      border-radius: 0;
    }
    .stat-item {
      flex: 1;
    }
    .stat-number {
      font-size: 56px;
      font-weight: 800;
      color: var(--accent-one);
      line-height: 1.1;
      margin-bottom: 8px;
      font-family: var(--font-eng);
    }
    .stat-desc {
      font-size: 16px;
      color: var(--text-heading);
    }
    .stat-divider {
      width: 1px;
      background: var(--border-light);
      height: 60px;
      align-self: center;
    }

    /* 证言错落布局 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .testimonial-main {
      grid-row: span 2;
    }
    .testimonial-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      position: relative;
    }
    .testimonial-quote {
      font-size: 48px;
      color: rgba(233,69,96,0.3);
      line-height: 1;
      margin-bottom: 12px;
      font-family: Georgia, serif;
    }
    .testimonial-text {
      font-size: 18px;
      font-style: italic;
      margin-bottom: 24px;
      color: var(--text-body);
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .testimonial-author img {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      object-fit: cover;
      background: var(--alt-bg);
    }

    /* FAQ 手风琴 */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .accordion-question {
      display: flex;
      align-items: center;
      gap: 16px;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      color: var(--text-heading);
      transition: color 0.2s;
    }
    .accordion-question:hover {
      color: var(--accent-one);
    }
    .q-badge {
      background: var(--accent-one);
      color: #fff;
      width: 28px;
      height: 28px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      font-weight: 700;
      flex-shrink: 0;
    }
    .accordion-icon {
      margin-left: auto;
      transition: transform 0.3s;
      color: var(--accent-one);
    }
    .accordion-answer {
      display: none;
      padding: 12px 0 12px 44px;
      color: var(--text-body);
      background: #FAFAFA;
      border-radius: 8px;
      margin-top: 8px;
    }
    .accordion-item.active .accordion-answer {
      display: block;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(45deg);
    }

    /* CTA 区块 */
    .cta-section {
      background: var(--primary);
      color: #fff;
      padding: 80px 0;
      text-align: center;
    }
    .cta-form {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 32px;
    }
    .cta-form input,
    .cta-form textarea {
      padding: 14px 16px;
      border-radius: var(--radius-btn);
      border: 1px solid var(--border-light);
      background: #fff;
      font-family: var(--font-sans);
      font-size: 16px;
      min-width: 200px;
      outline: none;
      transition: 0.2s;
      color: var(--text-body);
    }
    .cta-form input:focus,
    .cta-form textarea:focus {
      border-color: var(--accent-one);
      box-shadow: 0 0 0 3px rgba(233,69,96,0.2);
    }

    /* 页脚 */
    .footer {
      background: var(--primary);
      color: rgba(255,255,255,0.7);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer a {
      color: rgba(255,255,255,0.7);
      text-decoration: none;
    }
    .footer a:hover {
      color: var(--accent-one);
    }
    .social-icons i {
      font-size: 20px;
      margin-right: 16px;
      color: var(--accent-one);
      transition: opacity 0.2s;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
      color: rgba(255,255,255,0.5);
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .search-box {
        width: 200px;
      }
    }
    @media (max-width: 768px) {
      h1 { font-size: 28px; }
      h2 { font-size: 24px; }
      .nav-links { display: none; }
      .hamburger { display: block; }
      .search-box { width: 100%; margin: 10px 0; order: 3; }
      .nav-container { flex-wrap: wrap; }
      .pain-grid { grid-template-columns: 1fr; }
      .stats-row { flex-direction: column; gap: 32px; }
      .stat-divider { display: none; }
      .testimonial-grid { grid-template-columns: 1fr; }
      .hero-illustration { display: none; }
      .solution-row, .solution-row.reverse { flex-direction: column; }
      section { padding-top: var(--section-gap-mobile); padding-bottom: var(--section-gap-mobile); }
    }
    @media (max-width: 520px) {
      .cta-form { flex-direction: column; }
    }
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: #fff;
      padding: 20px;
      width: 100%;
      box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    }
    .mobile-menu a {
      padding: 12px 0;
      border-bottom: 1px solid var(--border-light);
    }