/* roulang page: index */
:root {
      --primary: #FA5C4C;
      --primary-hover: #e04a3a;
      --primary-light: rgba(250, 92, 76, 0.08);
      --primary-soft: rgba(250, 92, 76, 0.15);
      --secondary: #1E2A3A;
      --secondary-light: #2c3a4e;
      --body-bg: #FAFAF8;
      --surface: #ffffff;
      --text-main: #1E2A3A;
      --text-secondary: #5a6470;
      --text-muted: #88909b;
      --border-light: #e9ecef;
      --border-lighter: #f0f0ed;
      --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
      --shadow-hover: 0 12px 28px rgba(0, 0, 0, 0.08);
      --radius-md: 14px;
      --radius-lg: 18px;
      --radius-btn: 8px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Inter', system-ui, -apple-system, sans-serif;
      --transition: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--body-bg);
      color: var(--text-main);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-weight: 700;
      letter-spacing: -0.2px;
    }

    h1 {
      font-size: 2.8rem;
      line-height: 1.2;
    }

    h2 {
      font-size: 1.9rem;
      line-height: 1.3;
    }

    h3 {
      font-size: 1.4rem;
      font-weight: 600;
    }

    .text-muted-custom {
      color: var(--text-secondary);
      line-height: 1.8;
    }

    .container {
      max-width: 1140px;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航栏 */
    .navbar-custom {
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(8px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
      height: 72px;
      padding: 0 24px;
      transition: var(--transition);
    }
    .navbar-custom.scrolled {
      box-shadow: 0 4px 14px rgba(0,0,0,0.06);
    }
    .navbar-brand-custom {
      font-weight: 700;
      font-size: 1.7rem;
      color: var(--secondary) !important;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .navbar-brand-custom i {
      color: var(--primary);
      font-size: 2rem;
    }
    .nav-chip-group {
      display: flex;
      gap: 6px;
      flex-wrap: wrap;
    }
    .nav-chip {
      background: transparent;
      border: none;
      padding: 8px 16px;
      border-radius: 40px;
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 0.95rem;
      transition: var(--transition);
      white-space: nowrap;
      text-decoration: none;
    }
    .nav-chip:hover,
    .nav-chip.active {
      background: var(--primary-light);
      color: var(--primary);
      font-weight: 600;
    }
    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: white;
      border-radius: var(--radius-btn);
      padding: 10px 22px;
      font-weight: 600;
      transition: var(--transition);
      box-shadow: 0 4px 10px rgba(250, 92, 76, 0.25);
    }
    .btn-primary-custom:hover {
      background: var(--primary-hover);
      box-shadow: 0 8px 18px rgba(250, 92, 76, 0.35);
      color: white;
      transform: translateY(-1px);
    }
    .btn-outline-custom {
      border: 1px solid var(--primary);
      color: var(--primary);
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 10px 22px;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background: var(--primary-light);
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-lg-custom {
      padding: 14px 34px;
      font-size: 1.1rem;
    }
    .navbar-toggler {
      border: none;
      color: var(--secondary);
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    @media (max-width: 991.98px) {
      .navbar-collapse {
        background: white;
        border-radius: 20px;
        padding: 20px;
        margin-top: 12px;
        box-shadow: var(--shadow-md);
      }
      .nav-chip-group {
        flex-direction: column;
        gap: 8px;
      }
    }

    /* Hero */
    #hero {
      padding: 140px 0 100px;
      background: linear-gradient(180deg, #fff9f8 0%, #fafaf8 100%);
    }
    .hero-badge {
      background: var(--primary-light);
      color: var(--primary);
      border-radius: 30px;
      padding: 6px 16px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 20px;
    }
    .hero-image-placeholder {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 28px;
      min-height: 380px;
      width: 100%;
      box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    }

    /* 区块通用 */
    section {
      padding: 90px 0;
    }
    .section-title {
      margin-bottom: 50px;
    }
    .bg-soft {
      background: #f9f7f5;
    }
    .bg-dark-custom {
      background: var(--secondary);
      color: white;
    }

    /* 卡片 */
    .card-custom {
      background: var(--surface);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      border: 1px solid var(--border-lighter);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-5px);
      border-color: transparent;
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: var(--primary-light);
      border-radius: 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 1.7rem;
      margin-bottom: 20px;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.1;
    }
    .progress-custom {
      height: 8px;
      background: #e9ecef;
      border-radius: 20px;
      margin-top: 15px;
    }
    .progress-bar-custom {
      background: var(--primary);
      border-radius: 20px;
      width: 85%;
    }

    /* 证言 */
    .testimonial-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      border-left: 5px solid var(--primary);
    }
    .avatar-placeholder {
      width: 60px;
      height: 60px;
      background: #ddd;
      border-radius: 50%;
      background-size: cover;
    }

    /* FAQ */
    .accordion-button:not(.collapsed) {
      background: var(--primary-light);
      color: var(--secondary);
      font-weight: 600;
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--primary-soft);
    }
    .accordion-item {
      border: none;
      margin-bottom: 12px;
      border-radius: var(--radius-md) !important;
      overflow: hidden;
    }
    .accordion-button {
      border-radius: var(--radius-md) !important;
      font-weight: 600;
    }

    /* CTA */
    #cta {
      background: linear-gradient(135deg, #1E2A3A 0%, #2c3a4e 100%);
    }
    
    footer {
      background: #1a2532;
      color: #b0b8c1;
    }
    footer a {
      color: #ccd4db;
      text-decoration: none;
    }
    footer a:hover {
      color: var(--primary);
    }

    @media (max-width: 768px) {
      h1 { font-size: 2.1rem; }
      h2 { font-size: 1.6rem; }
      .hero-image-placeholder { min-height: 260px; }
    }