/* roulang page: index */
:root {
      --color-primary: #F57C00;
      --color-primary-dark: #E65100;
      --color-secondary: #263238;
      --color-bg: #FAF8F5;
      --color-accent: #FFC107;
      --color-white: #FFFFFF;
      --color-gray-light: #F5F5F5;
      --color-gray-border: #E0E0E0;
      --color-text-body: #546E7A;
      --color-text-heading: #263238;
      --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.04);
      --shadow-card-hover: 0 16px 38px rgba(245, 124, 0, 0.12);
      --radius-md: 12px;
      --radius-sm: 8px;
      --transition-base: all 0.3s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", system-ui, -apple-system, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--color-bg);
      color: var(--color-text-body);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      transition: var(--transition-base);
      border: none;
      outline: none;
      white-space: nowrap;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
      width: 100%;
    }

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 999;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(0,0,0,0.02);
      transition: box-shadow 0.3s ease;
      height: 70px;
      display: flex;
      align-items: center;
    }

    .header.scrolled {
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--color-secondary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 0.3rem;
    }
    .logo i {
      color: var(--color-primary);
      font-size: 1.8rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 1.8rem;
      font-weight: 500;
      color: var(--color-secondary);
    }

    .nav-links a {
      transition: color 0.2s;
      font-size: 0.98rem;
      font-weight: 500;
    }
    .nav-links a:hover {
      color: var(--color-primary);
    }

    .nav-cta {
      background: var(--color-primary);
      color: white !important;
      padding: 0.6rem 1.4rem;
      border-radius: 30px;
      font-weight: 600;
      box-shadow: 0 4px 10px rgba(245, 124, 0, 0.25);
    }
    .nav-cta:hover {
      background: var(--color-primary-dark);
      box-shadow: 0 6px 16px rgba(245, 124, 0, 0.35);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--color-secondary);
      cursor: pointer;
    }

    /* 板块通用 */
    .section {
      padding: 5rem 0;
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--color-text-heading);
      line-height: 1.3;
      margin-bottom: 1rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -10px;
      width: 50px;
      height: 3px;
      background: var(--color-primary);
      border-radius: 4px;
    }
    .text-center .section-title::after {
      left: 50%;
      transform: translateX(-50%);
    }

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

    /* 卡片 */
    .card {
      background: var(--color-white);
      border-radius: var(--radius-md);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
      height: 100%;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }

    /* 按钮样式 */
    .btn-primary {
      background: var(--color-primary);
      color: white;
      padding: 0.9rem 2.2rem;
      font-size: 1rem;
      border-radius: 8px;
      box-shadow: 0 6px 16px rgba(245, 124, 0, 0.2);
    }
    .btn-primary:hover {
      background: var(--color-primary-dark);
      box-shadow: 0 10px 24px rgba(245, 124, 0, 0.35);
    }

    .btn-outline {
      background: transparent;
      color: var(--color-primary);
      border: 2px solid var(--color-primary);
      padding: 0.9rem 2.2rem;
      font-size: 1rem;
      border-radius: 8px;
    }
    .btn-outline:hover {
      background: var(--color-primary);
      color: white;
    }

    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      color: white;
      margin-top: 70px;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(38,50,56,0.75) 0%, rgba(245,124,0,0.55) 90%);
      backdrop-filter: blur(1px);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid #EEEEEE;
      padding: 1.2rem 0;
      cursor: pointer;
      transition: background 0.2s;
    }
    .faq-question {
      font-weight: 700;
      font-size: 1.1rem;
      color: var(--color-secondary);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s ease;
      color: var(--color-text-body);
      line-height: 1.8;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 0.8rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
      color: var(--color-primary);
    }
    .faq-icon {
      transition: transform 0.3s ease;
      font-size: 1.2rem;
    }

    @media (max-width: 1024px) {
      .section-title {
        font-size: 2rem;
      }
    }

    @media (max-width: 768px) {
      .hamburger {
        display: block;
      }
      .nav-links {
        position: fixed;
        top: 70px;
        right: -100%;
        width: 75%;
        max-width: 300px;
        height: calc(100vh - 70px);
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: flex-start;
        padding: 2rem;
        gap: 1.8rem;
        box-shadow: -8px 0 25px rgba(0,0,0,0.1);
        transition: right 0.35s ease;
      }
      .nav-links.active {
        right: 0;
      }
      .hero-section {
        min-height: 90vh;
      }
      .section-title {
        font-size: 1.9rem;
      }
    }