/* roulang page: index */
:root {
      --primary-deep: #1E2A4F;
      --primary-dark: #141E38;
      --accent-cyan: #00C4B4;
      --accent-cyan-hover: #00A89A;
      --bg-warm: #FAF9F7;
      --bg-light: #F0EEEA;
      --bg-panel: #F7F6F4;
      --text-main: #2C2C2C;
      --text-secondary: #5F5F5F;
      --text-muted: #8C8C8C;
      --white: #FFFFFF;
      --border-light: #E0DED9;
      --radius-card: 12px;
      --radius-btn: 30px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 12px 32px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-weight: 600;
      line-height: 1.3;
      color: var(--primary-deep);
    }
    h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 36px;
      margin-bottom: 24px;
    }
    h3 {
      font-size: 22px;
      margin-bottom: 12px;
    }
    p {
      color: var(--text-secondary);
      margin-bottom: 1.5em;
    }
    a {
      transition: color 0.2s ease, border-color 0.2s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    /* 按钮系统 */
    .btn {
      display: inline-block;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      text-align: center;
      transition: all 0.2s ease;
      text-decoration: none;
      cursor: pointer;
      font-size: 16px;
      border: 2px solid transparent;
      background: transparent;
      line-height: 1.4;
    }
    .btn-primary {
      background-color: var(--accent-cyan);
      color: var(--white);
      border-color: var(--accent-cyan);
    }
    .btn-primary:hover {
      background-color: var(--accent-cyan-hover);
      border-color: var(--accent-cyan-hover);
      transform: scale(1.03);
      color: var(--white);
    }
    .btn-ghost {
      background: transparent;
      color: var(--accent-cyan);
      border-color: var(--accent-cyan);
    }
    .btn-ghost:hover {
      background-color: var(--accent-cyan);
      color: var(--white);
      border-color: var(--accent-cyan);
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 40;
      background: rgba(250,249,247,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.02);
      transition: background 0.3s ease;
      height: 72px;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary-deep);
      text-decoration: none;
      letter-spacing: 0.5px;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-cyan);
      border-bottom-color: var(--accent-cyan);
    }
    /* 汉堡菜单定制 */
    .hamburger {
      display: none;
      cursor: pointer;
      font-size: 24px;
      color: var(--primary-deep);
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(250,249,247,0.98);
        backdrop-filter: blur(16px);
        padding: 24px;
        gap: 1.2rem;
        box-shadow: 0 12px 24px rgba(0,0,0,0.05);
      }
      .nav-links.show {
        display: flex;
      }
      .hamburger {
        display: block;
      }
    }
    /* 区块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 640px) {
      section {
        padding: 60px 0;
      }
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 28px;
      }
    }
    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-left h1 {
      margin-bottom: 24px;
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
    }
    .hero-cta {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-right {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }
    .trust-badge {
      display: flex;
      gap: 32px;
      margin-top: 32px;
    }
    .trust-item {
      text-align: center;
    }
    .trust-number {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary-deep);
    }
    /* 痛点卡片不对称栅格 */
    .pain-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 2fr;
      gap: 24px;
    }
    .pain-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      border-left: 3px solid var(--accent-cyan);
      transition: all 0.25s ease;
    }
    .pain-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    /* 解决方案双列 */
    .solution-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }
    .data-stack {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }
    .data-item {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .data-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-cyan);
      line-height: 1;
    }
    .data-desc {
      color: var(--text-secondary);
    }
    /* 优势 2x2 网格中央底衬 */
    .adv-wrapper {
      position: relative;
    }
    .adv-bg {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 280px;
      height: 280px;
      background: radial-gradient(circle, rgba(30,42,79,0.08) 0%, transparent 70%);
      border-radius: 50%;
      z-index: 0;
    }
    .adv-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      position: relative;
      z-index: 2;
    }
    .adv-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: 0.25s;
    }
    .adv-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    /* 流程步骤条 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
      flex-wrap: wrap;
    }
    .step-item {
      text-align: center;
      flex: 1;
      min-width: 140px;
      position: relative;
      z-index: 2;
    }
    .step-circle {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--accent-cyan);
      color: white;
      font-weight: 700;
      font-size: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
    }
    .step-line {
      position: absolute;
      top: 24px;
      left: 0;
      width: 100%;
      height: 2px;
      border-top: 2px dashed var(--border-light);
      z-index: 1;
    }
    /* 证言区 */
    .testimonial-block {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 48px;
      align-items: center;
    }
    .quote-large {
      font-size: 24px;
      font-weight: 500;
      color: var(--primary-deep);
      font-style: italic;
    }
    .testimonial-cards {
      display: flex;
      gap: 16px;
      overflow-x: auto;
      padding-bottom: 8px;
    }
    .test-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 24px;
      min-width: 240px;
      box-shadow: var(--shadow-card);
    }
    /* FAQ 双列手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
    }
    .faq-item {
      background: var(--bg-panel);
      border-radius: 8px;
      margin-bottom: 0;
    }
    .faq-question {
      padding: 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--primary-deep);
    }
    .faq-answer {
      padding: 0 20px 20px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-icon {
      transition: transform 0.3s;
      color: var(--accent-cyan);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* CTA 深色区块 */
    .cta-dark {
      background: linear-gradient(135deg, #141E38 0%, #1E2A4F 100%);
      color: white;
      text-align: center;
    }
    .cta-dark h2 {
      color: white;
    }
    .trust-marks {
      display: flex;
      justify-content: center;
      gap: 48px;
      margin-top: 32px;
    }
    /* 页脚 */
    .site-footer {
      background: #141E38;
      color: #B0B8CC;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer-col h4 {
      color: white;
      margin-bottom: 16px;
    }
    .footer-col a {
      color: #B0B8CC;
      display: block;
      margin-bottom: 8px;
      text-decoration: none;
    }
    .footer-col a:hover {
      color: var(--accent-cyan);
      text-decoration: underline;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
    }
    @media (max-width: 1024px) {
      .hero-grid, .solution-grid, .testimonial-block {
        grid-template-columns: 1fr;
      }
      .pain-grid {
        grid-template-columns: 1fr;
      }
      .faq-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 640px) {
      .adv-grid {
        grid-template-columns: 1fr;
      }
    }