/* roulang page: index */
:root {
      --primary: #E8451E;
      --primary-dark: #C93A15;
      --secondary: #1C1C1E;
      --accent: #A3E635;
      --bg-warm: #FAF9F6;
      --card-bg: #FFFFFF;
      --light-gray: #F2F0EB;
      --text-primary: #2D2A26;
      --text-secondary: #5C5852;
      --border-light: #E5E0D8;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-sans: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
      --font-number: "Inter", "SF Pro Display", sans-serif;
      --transition: 0.25s ease;
      --container-max: 1200px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-primary);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 1.5rem;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      display: inline-block;
      border: none;
      background: transparent;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(28, 28, 30, 0.92);
      backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    .logo {
      font-size: 1.5rem;
      font-weight: 800;
      color: white;
      letter-spacing: -0.02em;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .logo span {
      color: var(--primary);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-link {
      color: rgba(255,255,255,0.8);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.25rem 0;
      position: relative;
      transition: color var(--transition);
    }

    .nav-link:hover,
    .nav-link.active {
      color: #fff;
    }

    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--primary);
      border-radius: 2px;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      width: 28px;
      height: 20px;
      justify-content: center;
    }
    .hamburger span {
      display: block;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: var(--transition);
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1C1C1E 0%, #3A1C0E 100%);
      min-height: 85vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.2;
      mix-blend-mode: overlay;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 3rem;
      flex-wrap: wrap;
    }

    .hero-text {
      flex: 1 1 400px;
    }

    .hero h1 {
      font-size: clamp(2.25rem, 5vw, 3.75rem);
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.15;
      color: white;
      margin-bottom: 1.5rem;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2rem;
      max-width: 500px;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 0.85rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition);
      box-shadow: 0 4px 12px rgba(232,69,30,0.3);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(232,69,30,0.5);
    }

    .hero-image {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
    }
    .hero-image img {
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
      max-height: 450px;
      object-fit: cover;
    }

    /* 板块通用 */
    section {
      padding: 5rem 0;
    }

    .section-title {
      font-size: clamp(1.75rem, 3.5vw, 2.5rem);
      font-weight: 700;
      letter-spacing: -0.01em;
      line-height: 1.25;
      margin-bottom: 1rem;
      color: var(--secondary);
    }

    .section-desc {
      color: var(--text-secondary);
      margin-bottom: 3rem;
      font-size: 1.1rem;
    }

    /* 痛点 */
    .pain-grid {
      display: flex;
      gap: 2rem;
      flex-wrap: wrap;
    }
    .pain-left {
      flex: 1 1 300px;
    }
    .pain-right {
      flex: 2 1 500px;
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }
    .pain-card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 1.5rem;
      display: flex;
      align-items: center;
      gap: 1rem;
      transition: var(--transition);
    }
    .pain-card:hover {
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }
    .pain-icon {
      font-size: 2rem;
      color: var(--primary);
    }
    .pain-text strong {
      display: block;
      font-size: 1.1rem;
    }

    /* 解决方案卡片偏移 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      align-items: start;
    }
    .solution-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      overflow: hidden;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .solution-card:nth-child(2) {
      margin-top: -30px;
    }
    .solution-card:hover {
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }
    .solution-img {
      height: 180px;
      object-fit: cover;
      width: 100%;
    }
    .solution-body {
      padding: 1.5rem;
    }
    .solution-body h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
    }

    /* 成果数据深色区块 */
    .results {
      background: var(--secondary);
      color: white;
      text-align: center;
    }
    .stats-grid {
      display: flex;
      justify-content: center;
      gap: 4rem;
      flex-wrap: wrap;
      margin-top: 2rem;
    }
    .stat-item {
      font-family: var(--font-number);
    }
    .stat-number {
      font-size: clamp(2.5rem, 6vw, 4rem);
      font-weight: 800;
      color: var(--accent);
    }
    .stat-label {
      color: rgba(255,255,255,0.7);
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2rem;
    }
    .testimonial-card {
      background: var(--light-gray);
      border-radius: var(--radius-card);
      padding: 2rem;
      position: relative;
    }
    .quote-icon {
      font-size: 3rem;
      color: rgba(232,69,30,0.3);
      line-height: 1;
    }
    .testimonial-text {
      font-style: italic;
      margin: 1rem 0;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      margin-top: 0.5rem;
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
    }

    /* CTA */
    .cta-block {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 4rem 1.5rem;
      border-radius: 24px;
    }
    .btn-ghost {
      border: 2px solid white;
      color: white;
      padding: 0.7rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      margin: 0.5rem;
    }
    .btn-ghost:hover {
      background: rgba(255,255,255,0.15);
    }

    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: rgba(255,255,255,0.8);
      padding: 3rem 1.5rem 2rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
      margin-bottom: 2rem;
    }
    .footer-logo {
      font-size: 1.5rem;
      font-weight: 800;
      color: white;
    }

    @media (max-width: 1024px) {
      .solutions-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .solution-card:nth-child(2) {
        margin-top: 0;
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--secondary);
        flex-direction: column;
        justify-content: center;
        gap: 2rem;
        font-size: 1.5rem;
      }
      .nav-menu.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .hero-content {
        flex-direction: column;
      }
      .solutions-grid {
        grid-template-columns: 1fr;
      }
      .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        gap: 2rem;
      }
      .pain-grid {
        flex-direction: column;
      }
    }