/* roulang page: index */
:root {
      --primary: #1A3B5C;
      --primary-hover: #0F2A47;
      --accent: #C99A4B;
      --accent-hover: #B8863A;
      --bg: #F7F9FC;
      --surface: #FFFFFF;
      --text-primary: #1E293B;
      --text-secondary: #475569;
      --text-title: #0F172A;
      --border: #E2E8F0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 4px 8px rgba(0,0,0,0.06), 0 12px 24px rgba(0,0,0,0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-weight: 600;
      color: var(--text-title);
    }
    h1 {
      font-size: clamp(2.2rem, 5vw, 3.2rem);
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: clamp(1.8rem, 4vw, 2.4rem);
      line-height: 1.3;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 8px;
    }
    p {
      color: var(--text-secondary);
      margin-bottom: 1.2rem;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.2s ease;
    }
    img {
      max-width: 100%;
      display: block;
    }
    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border);
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
    }
    .header-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 0;
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--accent);
      font-size: 1.8rem;
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 18px;
      color: var(--text-secondary);
    }
    .header-actions i {
      font-size: 1.2rem;
      cursor: pointer;
      transition: color 0.2s;
    }
    .header-actions i:hover {
      color: var(--accent);
    }
    .hotline {
      font-size: 0.9rem;
      font-weight: 500;
    }
    .nav-channels {
      display: flex;
      align-items: center;
      gap: 28px;
      padding: 10px 0 14px;
      flex-wrap: wrap;
    }
    .nav-channels a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-primary);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-channels a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s ease;
    }
    .nav-channels a:hover {
      color: var(--accent);
    }
    .nav-channels a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      font-size: 1.6rem;
      cursor: pointer;
      color: var(--primary);
    }
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: white;
      padding: 16px 24px;
      border-top: 1px solid var(--border);
      gap: 12px;
      animation: fadeIn 0.2s ease;
    }
    .mobile-menu a {
      font-weight: 500;
      padding: 6px 0;
      border-bottom: 1px solid var(--border);
    }
    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(-6px); }
      to { opacity: 1; transform: translateY(0); }
    }
    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      gap: 48px;
      padding: 60px 0 80px;
      background: linear-gradient(180deg, #F7F9FC 0%, #FFFFFF 100%);
    }
    .hero-content {
      flex: 1;
    }
    .hero-content h1 {
      margin-bottom: 20px;
      color: var(--text-title);
    }
    .hero-sub {
      font-size: 1.1rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 540px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
      text-align: center;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 2px 8px rgba(26,59,92,0.2);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: scale(1.02);
      box-shadow: 0 6px 14px rgba(26,59,92,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: rgba(26,59,92,0.05);
      border-color: var(--primary-hover);
    }
    .hero-image {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero-image img {
      max-width: 100%;
      border-radius: 24px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.06);
    }
    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      margin-bottom: 12px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      border: 1px solid var(--border);
      height: 100%;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }
    .accent-bar {
      width: 40px;
      height: 4px;
      background: var(--accent);
      margin-bottom: 16px;
    }
    /* 痛点卡片 */
    .pain-card {
      border-left: 5px solid var(--accent);
      padding-left: 24px;
    }
    /* 服务卡片图片 */
    .service-img {
      height: 160px;
      background-size: cover;
      background-position: center;
      border-radius: 12px 12px 0 0;
      margin: -32px -32px 20px -32px;
      width: calc(100% + 64px);
    }
    .tag {
      display: inline-block;
      background: rgba(201,154,75,0.1);
      color: var(--accent);
      font-weight: 600;
      font-size: 0.8rem;
      padding: 4px 10px;
      border-radius: 20px;
      margin-top: 8px;
    }
    /* 流程步骤 */
    .steps {
      display: flex;
      justify-content: space-between;
      text-align: center;
      position: relative;
    }
    .step {
      flex: 1;
      position: relative;
    }
    .step-circle {
      width: 56px;
      height: 56px;
      background: var(--accent);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.4rem;
      margin: 0 auto 16px;
    }
    .step::after {
      content: '';
      position: absolute;
      top: 28px;
      left: 60%;
      width: 80%;
      height: 2px;
      background: dashed var(--border);
      z-index: -1;
    }
    .step:last-child::after {
      display: none;
    }
    /* 数据深色条 */
    .data-strip {
      background: var(--primary);
      padding: 60px 0;
      color: white;
    }
    .data-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 24px;
    }
    .data-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent);
    }
    /* 证言 */
    .testimonial-card {
      background: #F8FAFC;
      padding: 28px;
      border-radius: 12px;
      font-style: italic;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: 8px;
      margin-bottom: 12px;
      border: 1px solid var(--border);
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      border-left: 4px solid var(--accent);
    }
    .faq-answer {
      padding: 0 24px 18px;
      display: none;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-section {
      background: var(--primary);
      text-align: center;
      padding: 80px 0;
      color: white;
    }
    .cta-form {
      display: flex;
      max-width: 500px;
      margin: 24px auto 0;
      gap: 12px;
    }
    .cta-form input {
      flex: 1;
      padding: 14px 18px;
      border-radius: var(--radius-input);
      border: none;
      background: white;
    }
    .btn-accent {
      background: var(--accent);
      color: white;
    }
    .btn-accent:hover {
      background: var(--accent-hover);
    }
    /* 页脚 */
    .footer {
      background: #0F172A;
      color: #CBD5E1;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer a:hover {
      color: var(--accent);
    }
    .copyright {
      border-top: 1px solid #334155;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 0.9rem;
    }
    @media (max-width: 992px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .hero { flex-direction: column; }
      .steps { flex-direction: column; gap: 32px; }
      .step::after { display: none; }
      .data-grid { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-channels { display: none; }
      .hamburger { display: block; }
      .mobile-menu.show { display: flex; }
      .grid-3, .grid-2 { grid-template-columns: 1fr; }
      .hero-buttons { flex-direction: column; }
      .cta-form { flex-direction: column; }
    }