/* roulang page: index */
/* 设计变量 */
    :root {
      --deep-charcoal: #1A1A1A;
      --competition-red: #E63946;
      --electric-purple: #7B2FF7;
      --fog-gray: #F5F5F7;
      --lead-gray: #6B7280;
      --pure-white: #FFFFFF;
      --border-light: #E5E7EB;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
      --radius-card: 16px;
      --radius-btn: 8px;
      --transition: 0.25s ease;
      --container-max: 1280px;
      --nav-height: 72px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
      background-color: var(--pure-white);
      color: var(--deep-charcoal);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: var(--pure-white);
      z-index: 1000;
      display: flex;
      align-items: center;
      border-bottom: 1px solid transparent;
      transition: box-shadow var(--transition), border-color var(--transition);
    }

    .site-header.scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      border-bottom: 1px solid var(--border-light);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
      color: var(--deep-charcoal);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo span {
      color: var(--competition-red);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      text-decoration: none;
      color: var(--lead-gray);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color var(--transition);
      position: relative;
    }

    .nav-links a:hover {
      color: var(--deep-charcoal);
    }

    .btn {
      display: inline-block;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      text-decoration: none;
      transition: all var(--transition);
      cursor: pointer;
      border: none;
      background: transparent;
      line-height: 1.2;
    }

    .btn-primary {
      background: var(--competition-red);
      color: white;
      box-shadow: 0 4px 12px rgba(230,57,70,0.3);
    }

    .btn-primary:hover {
      background: #C53030;
      transform: scale(1.03);
      box-shadow: 0 8px 18px rgba(230,57,70,0.4);
    }

    .btn-outline {
      border: 1px solid var(--lead-gray);
      color: var(--deep-charcoal);
      background: transparent;
    }

    .btn-outline:hover {
      background: var(--fog-gray);
      border-color: var(--deep-charcoal);
    }

    /* 移动端导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: var(--pure-white);
      border-top: 1px solid var(--border-light);
      z-index: 1000;
      padding: 8px 16px;
      box-shadow: 0 -4px 12px rgba(0,0,0,0.02);
    }

    .mobile-nav-inner {
      display: flex;
      justify-content: space-around;
      align-items: center;
    }

    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      color: var(--lead-gray);
      text-decoration: none;
      font-weight: 500;
    }

    .mobile-nav-item i {
      font-size: 1.2rem;
      margin-bottom: 2px;
    }

    .mobile-cta {
      background: var(--competition-red);
      color: white;
      padding: 10px 20px;
      border-radius: 40px;
      font-weight: 700;
      box-shadow: 0 6px 14px rgba(230,57,70,0.4);
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 700px;
      background: var(--deep-charcoal);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      margin-top: 0;
    }

    .hero-bg {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.3;
      z-index: 0;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(26,26,26,0.7);
      z-index: 1;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      gap: 48px;
    }

    .hero-text {
      flex: 1;
    }

    .hero h1 {
      font-size: 56px;
      font-weight: 900;
      line-height: 1.1;
      letter-spacing: -1px;
      color: white;
      margin-bottom: 20px;
    }

    .hero h1 span {
      color: var(--competition-red);
    }

    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .abstract-graphic {
      width: 320px;
      height: 320px;
      background: radial-gradient(circle at 30% 30%, rgba(123,47,247,0.4), transparent 70%);
      border-radius: 50%;
      filter: blur(60px);
      animation: float 8s infinite alternate ease-in-out;
    }

    @keyframes float {
      0% { transform: translateY(0) scale(1); }
      100% { transform: translateY(-15px) scale(1.05); }
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 16px;
      color: var(--deep-charcoal);
    }

    .section-desc {
      color: var(--lead-gray);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

    .pain-card {
      background: var(--pure-white);
      border-radius: 0;
      padding: 32px;
      border-bottom: 1px solid var(--border-light);
      transition: border-color var(--transition);
      display: flex;
      gap: 24px;
    }

    .pain-card:hover {
      border-bottom-color: var(--competition-red);
    }

    .pain-text h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .pain-img {
      width: 140px;
      height: 100px;
      background: var(--fog-gray);
      border-radius: 12px;
      overflow: hidden;
      flex-shrink: 0;
    }

    .pain-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    /* 解决方案 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .solution-card {
      background: var(--pure-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }

    .solution-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .solution-icon {
      font-size: 48px;
      color: var(--electric-purple);
      margin-bottom: 20px;
    }

    .solution-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 16px;
    }

    .tag {
      background: var(--fog-gray);
      color: var(--deep-charcoal);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 500;
    }

    /* 成果数据 */
    .results-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }

    .stat-number {
      font-size: 48px;
      font-weight: 900;
      color: var(--competition-red);
      line-height: 1.1;
      margin-bottom: 8px;
    }

    .stat-label {
      color: var(--lead-gray);
    }

    /* 证言 */
    .testimonial-list {
      display: flex;
      flex-direction: column;
      gap: 48px;
    }

    .testimonial-item {
      display: flex;
      gap: 24px;
      align-items: flex-start;
    }

    .quote-mark {
      font-size: 64px;
      color: rgba(123,47,247,0.2);
      line-height: 1;
      font-weight: 700;
    }

    .testimonial-text {
      font-size: 18px;
      font-style: italic;
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .author {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .author-img {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--fog-gray);
      overflow: hidden;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--fog-gray);
    }

    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 20px 0;
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--deep-charcoal);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--lead-gray);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }

    .arrow {
      transition: transform 0.3s ease;
    }

    .faq-item.active .arrow {
      transform: rotate(180deg);
    }

    /* CTA */
    .cta-band {
      background: var(--deep-charcoal);
      padding: 100px 0;
      text-align: center;
    }

    .cta-band h2 {
      color: white;
      margin-bottom: 16px;
    }

    .cta-micro {
      color: var(--lead-gray);
      margin-bottom: 32px;
    }

    /* 页脚 */
    .site-footer {
      background: var(--deep-charcoal);
      color: var(--lead-gray);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    .footer-col h4 {
      color: white;
      margin-bottom: 16px;
      font-weight: 600;
    }

    .footer-links a {
      display: block;
      color: var(--lead-gray);
      text-decoration: none;
      margin-bottom: 8px;
      transition: color var(--transition);
    }

    .footer-links a:hover {
      color: var(--competition-red);
    }

    .copyright {
      text-align: center;
      margin-top: 40px;
      padding-top: 20px;
      border-top: 1px solid rgba(255,255,255,0.1);
      font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero h1 {
        font-size: 44px;
      }
      .solutions-grid, .results-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-nav {
        display: block;
      }
      .site-header {
        display: none;
      }
      section {
        padding: 60px 0;
      }
      .hero {
        height: auto;
        padding: 120px 0 80px;
        min-height: auto;
      }
      .hero h1 {
        font-size: 36px;
      }
      .pain-grid, .solutions-grid, .results-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .section-title {
        font-size: 28px;
      }
      .container {
        padding: 0 20px;
      }
    }