/* roulang page: index */
:root {
      --primary: #0A0E17;
      --accent: #E63946;
      --emphasize: #F4A261;
      --surface: #FFFFFF;
      --surface-sub: #F8F9FA;
      --text-main: #1D1D1F;
      --text-sub: #6C757D;
      --border: #E9ECEF;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-tag: 4px;
      --shadow-card: 0 2px 16px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-mono: 'SF Mono', 'Menlo', 'Monaco', monospace;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-body);
      background: var(--surface);
      color: var(--text-main);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (min-width: 1024px) {
      .container {
        padding: 0 40px;
      }
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 24px;
      z-index: 100;
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
      background: transparent;
    }
    .nav.scrolled {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }
    .nav.scrolled .nav-logo,
    .nav.scrolled .nav-links a {
      color: var(--primary);
    }
    .nav-logo {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.5rem;
      color: white;
      letter-spacing: 1px;
      transition: color 0.3s;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 500;
      color: white;
      transition: color 0.3s;
    }
    .nav-links a {
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 0;
      width: 0%;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--accent);
      color: white !important;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s ease;
      white-space: nowrap;
    }
    .nav-cta:hover {
      background: #C1121F;
      transform: scale(1.03);
      box-shadow: 0 0 20px rgba(230,57,70,0.3);
    }
    .mobile-nav {
      display: none;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-nav {
        display: flex;
        position: fixed;
        bottom: 16px;
        left: 50%;
        transform: translateX(-50%);
        background: white;
        border-radius: 40px;
        padding: 8px 20px;
        box-shadow: 0 8px 24px rgba(0,0,0,0.12);
        gap: 16px;
        z-index: 110;
        backdrop-filter: blur(10px);
        background: rgba(255,255,255,0.9);
        align-items: center;
      }
      .mobile-nav a {
        font-size: 13px;
        font-weight: 500;
        color: var(--text-main);
        padding: 6px 10px;
        border-radius: 20px;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 2px;
      }
      .mobile-nav .mobile-cta {
        background: var(--accent);
        color: white;
        border-radius: 30px;
        padding: 8px 18px;
        font-weight: 600;
      }
    }

    /* Hero */
    .hero {
      height: 100vh;
      background: var(--primary);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      gap: 40px;
    }
    .hero-text {
      flex: 1;
      max-width: 600px;
      color: white;
    }
    .hero h1 {
      font-family: var(--font-title);
      font-size: 56px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 18px;
      color: #ADB5BD;
      max-width: 480px;
      margin-bottom: 40px;
    }
    .hero-btns {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
      display: inline-block;
    }
    .btn-primary:hover {
      background: #C1121F;
      transform: scale(1.03);
      box-shadow: 0 0 20px rgba(230,57,70,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s ease;
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary);
    }
    .hero-img {
      flex: 1;
      max-width: 500px;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: white;
      opacity: 0.7;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }
    @media (max-width: 1024px) {
      .hero h1 {
        font-size: 44px;
      }
    }
    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero h1 {
        font-size: 36px;
      }
      .hero-sub {
        margin-left: auto;
        margin-right: auto;
      }
      .hero-btns {
        justify-content: center;
      }
      .hero-img {
        max-width: 280px;
        margin-top: 24px;
      }
    }

    /* 通用板块 */
    section {
      padding: 120px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
    }
    .section-title {
      font-family: var(--font-title);
      font-size: 44px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-main);
    }
    .section-sub {
      color: var(--text-sub);
      max-width: 600px;
      margin-bottom: 48px;
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: 1fr 0.8fr 0.8fr;
      gap: 32px;
      background: var(--surface-sub);
      padding: 48px;
      border-radius: 32px;
    }
    .pain-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }
    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    @media (max-width: 768px) {
      .pain-grid {
        grid-template-columns: 1fr;
        padding: 24px;
      }
    }

    /* 解决方案交替 */
    .solution-block {
      display: flex;
      align-items: center;
      gap: 80px;
      margin-bottom: 80px;
    }
    .solution-block.reverse {
      flex-direction: row-reverse;
    }
    .sol-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .sol-text {
      flex: 1;
    }
    @media (max-width: 768px) {
      .solution-block, .solution-block.reverse {
        flex-direction: column;
        gap: 32px;
      }
    }

    /* 成果 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      gap: 32px;
      flex-wrap: wrap;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 48px;
      color: var(--emphasize);
      font-weight: 600;
    }

    /* 证言轮播模拟 */
    .testimonial-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 40px;
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 24px;
      align-items: center;
      max-width: 700px;
      margin: 0 auto;
    }
    .avatar {
      width: 70px;
      height: 70px;
      border-radius: 50%;
      background: #ddd;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 16px 0;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    /* 终极CTA */
    .cta-final {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 100px 24px;
    }
    .trust-badges {
      display: flex;
      justify-content: center;
      gap: 32px;
      margin-top: 32px;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    .copyright {
      border-top: 1px solid var(--border);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      color: var(--text-sub);
    }