/* roulang page: index */
/* 设计变量 */
    :root {
      --primary: #1A1A1A;
      --accent: #E63946;
      --gold: #F4A261;
      --bg-light: #F8F9FA;
      --text-gray: #ADB5BD;
      --white: #ffffff;
      --black: #000000;
      --font-sans: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
      --font-number: 'Oswald', 'Impact', 'Arial Black', sans-serif;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.08);
      --border-radius: 8px;
      --btn-radius: 4px;
      --transition: 0.3s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--primary);
      line-height: 1.8;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      background: none;
      transition: var(--transition);
      font-weight: 500;
      white-space: nowrap;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏 - 创作者平台风格 */
    .header {
      position: sticky;
      top: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      padding: 16px 0;
    }

    .header.scrolled {
      background: rgba(26, 26, 26, 0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--text-gray);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--white);
      letter-spacing: 1px;
      text-shadow: 0 2px 8px rgba(0,0,0,0.7);
    }

    .header.scrolled .logo {
      text-shadow: none;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--accent);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      color: white;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      color: var(--white);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--gold);
      transition: width 0.25s;
    }

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

    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .search-icon {
      color: var(--white);
      font-size: 1.2rem;
      background: transparent;
      padding: 8px;
      border-radius: 50%;
    }

    .btn-outline {
      border: 1px solid var(--white);
      color: var(--white);
      padding: 10px 20px;
      border-radius: var(--btn-radius);
      background: transparent;
      font-weight: 500;
    }

    .btn-outline:hover {
      background: var(--primary);
      border-color: var(--primary);
      color: white;
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 10px 22px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      border: 1px solid var(--accent);
      box-shadow: 0 4px 10px rgba(230, 57, 70, 0.3);
    }

    .btn-primary:hover {
      background: #C1121F;
      border-color: #C1121F;
      color: white;
      box-shadow: 0 6px 14px rgba(193, 18, 31, 0.4);
    }

    .btn-secondary {
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 10px 20px;
      border-radius: var(--btn-radius);
      background: transparent;
    }

    .btn-secondary:hover {
      background: var(--primary);
      color: white;
    }

    .btn-gold-hover:hover {
      background: var(--gold);
      border-color: var(--gold);
      color: var(--primary);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--white);
      font-size: 2rem;
      line-height: 1;
    }

    /* Hero 首屏 */
    .hero {
      min-height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      color: white;
      padding-top: 80px;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.4) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }

    .hero h1 {
      font-size: 3.5rem;
      font-weight: 900;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      color: white;
    }

    .hero p {
      font-size: 1.25rem;
      color: var(--bg-light);
      margin-bottom: 2.5rem;
      max-width: 600px;
    }

    .hero .btn-primary {
      font-size: 1.1rem;
      padding: 14px 32px;
    }

    .floating-accent {
      position: absolute;
      bottom: 40px;
      right: 10%;
      width: 120px;
      height: 120px;
      background: rgba(230, 57, 70, 0.15);
      border-radius: 50%;
      filter: blur(15px);
      z-index: 1;
    }

    /* 通用区块 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--primary);
    }

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

    /* 解决方案卡片 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .solution-card {
      background: var(--white);
      border: 1px solid var(--text-gray);
      border-radius: var(--border-radius);
      padding: 32px 24px;
      transition: all 0.25s;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .solution-card:hover {
      border-color: var(--accent);
      transform: translateY(-4px);
      box-shadow: var(--shadow-sm);
    }

    .solution-icon {
      font-size: 2.2rem;
      color: var(--accent);
    }

    .solution-card h3 {
      font-size: 1.5rem;
      font-weight: 700;
    }

    .solution-card p {
      color: #4a4a4a;
    }

    /* 成果数据 */
    .results {
      background: var(--primary);
      color: white;
    }

    .results .section-title {
      color: white;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      margin-top: 32px;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      color: var(--gold);
      font-weight: 700;
    }

    .stat-unit {
      font-size: 1rem;
      color: var(--text-gray);
      display: block;
      margin-top: 8px;
    }

    /* 证言 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .testimonial-card {
      background: white;
      border: 1px solid var(--text-gray);
      border-radius: var(--border-radius);
      padding: 28px;
      display: flex;
      align-items: flex-start;
      gap: 18px;
      transition: 0.2s;
    }

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

    .avatar {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      background: var(--text-gray);
      flex-shrink: 0;
      background-size: cover;
    }

    .testimonial-text {
      font-style: italic;
      color: #333;
      margin-bottom: 12px;
    }

    .testimonial-author {
      font-weight: 700;
      color: var(--primary);
    }

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

    .faq-item {
      border-bottom: 1px solid var(--text-gray);
      margin-bottom: 8px;
    }

    .faq-question {
      background: var(--primary);
      color: white;
      width: 100%;
      padding: 16px 20px;
      font-size: 1.1rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border: none;
      text-align: left;
      border-radius: 4px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      background: var(--white);
      color: #444;
      padding: 0 20px;
      border: 1px solid transparent;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 20px;
      border-color: var(--text-gray);
    }

    .faq-icon {
      font-size: 1.5rem;
      transition: transform 0.3s;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

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

    .cta-block h2 {
      color: white;
      font-size: 2.5rem;
      font-weight: 700;
    }

    .cta-block p {
      color: var(--bg-light);
      margin: 16px 0 32px;
    }

    .cta-actions {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }

    /* 页脚 */
    .footer {
      background: var(--primary);
      color: var(--text-gray);
      padding: 60px 0 30px;
    }

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

    .footer-logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }

    .footer a {
      color: var(--text-gray);
      display: block;
      margin-bottom: 8px;
    }

    .footer a:hover {
      color: var(--gold);
    }

    .copyright {
      text-align: center;
      margin-top: 48px;
      border-top: 1px solid #333;
      padding-top: 24px;
      font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
      .solutions-grid, .stats-grid, .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links, .nav-actions .btn-outline, .nav-actions .btn-primary {
        display: none;
      }

      .mobile-menu-toggle {
        display: block;
      }

      .hero h1 {
        font-size: 2rem;
      }

      .solutions-grid, .stats-grid, .testimonials-grid, .footer-grid {
        grid-template-columns: 1fr;
      }

      .cta-actions {
        flex-direction: column;
        align-items: center;
      }

      section {
        padding: 70px 0;
      }
    }