/* roulang page: index */
:root {
      --bs-primary: #E03C31;
      --bs-primary-rgb: 224, 60, 49;
      --bs-dark: #1A1A1A;
      --bs-body-bg: #F7F4F0;
      --bs-body-color: #1A1A1A;
      --bs-border-radius: 0.5rem;
      --bs-border-radius-lg: 1rem;
      --bs-border-radius-xl: 1.5rem;
      --bs-link-color: #E03C31;
      --bs-link-hover-color: #C62828;
      --gold: #C8963E;
      --gold-light: rgba(200, 150, 62, 0.25);
      --red-light: #FDECEA;
      --success: #2E7D32;
      --warning: #F57C00;
      --info: #1565C0;
      --section-padding: 5rem 0;
      --card-shadow: 0 2px 12px rgba(26,26,26,0.06);
      --card-hover-shadow: 0 12px 28px rgba(224,60,49,0.15);
      --transition-base: all 0.25s ease-in-out;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--bs-body-bg);
      color: var(--bs-body-color);
      line-height: 1.7;
      font-size: 16px;
      overflow-x: hidden;
    }
    h1, h2, h3, .h2, .h3 {
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    h1 {
      font-size: clamp(2.5rem, 6vw, 3.8rem);
      line-height: 1.2;
    }
    h2 {
      font-size: calc(1.8rem + 1vw);
      margin-bottom: 1.5rem;
    }
    .section-title {
      position: relative;
      display: inline-block;
      margin-bottom: 3rem;
      font-weight: 700;
    }
    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -12px;
      width: 60px;
      height: 4px;
      background: var(--bs-primary);
      border-radius: 2px;
    }
    .text-gold {
      color: var(--gold);
    }
    .bg-dark-custom {
      background-color: var(--bs-dark);
    }
    .btn {
      border-radius: 8px;
      padding: 0.7rem 2rem;
      font-weight: 600;
      transition: var(--transition-base);
      border: 2px solid transparent;
      letter-spacing: 0.5px;
    }
    .btn-primary {
      background-color: var(--bs-primary);
      border-color: var(--bs-primary);
      color: white;
    }
    .btn-primary:hover, .btn-primary:focus {
      background-color: #C62828;
      border-color: #C62828;
      box-shadow: 0 4px 12px rgba(224,60,49,0.4), inset 0 0 0 2px var(--gold-light);
      color: white;
    }
    .btn-outline-primary {
      border: 2px solid var(--bs-primary);
      color: var(--bs-primary);
      background: transparent;
    }
    .btn-outline-primary:hover {
      background-color: var(--red-light);
      border-color: #C62828;
      color: #C62828;
    }
    .btn-gold-outline {
      border: 2px solid var(--gold);
      color: var(--gold);
      background: transparent;
    }
    .btn-gold-outline:hover {
      background: rgba(200,150,62,0.1);
      border-color: #b8872e;
      color: #b8872e;
    }
    a {
      transition: var(--transition-base);
    }
    a.text-link {
      color: var(--bs-primary);
      text-decoration: none;
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    a.text-link:hover {
      text-decoration: underline;
      color: #C62828;
    }
    a.text-link i {
      transition: transform 0.2s;
    }
    a.text-link:hover i {
      transform: translateX(4px);
    }
    .badge-custom {
      background: rgba(224,60,49,0.1);
      color: var(--bs-primary);
      border: 1px solid rgba(224,60,49,0.3);
      border-radius: 20px;
      padding: 0.25rem 1rem;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .data-badge {
      font-family: 'Oswald', sans-serif;
      font-weight: 600;
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(4px);
      border: 1px solid var(--gold-light);
      border-radius: 30px;
      padding: 0.4rem 1.4rem;
      color: white;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    /* 导航分屏 Hero */
    .hero-split {
      display: flex;
      min-height: 100vh;
      background: linear-gradient(135deg, #1A1A1A 0%, #3D1C1C 100%);
      position: relative;
      overflow: hidden;
    }
    .nav-side {
      width: 40%;
      background: #1A1A1A;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 2rem 3rem;
      position: relative;
      z-index: 10;
    }
    .logo-area {
      margin-bottom: 3rem;
    }
    .logo-text {
      font-size: 2rem;
      font-weight: 700;
      color: white;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      letter-spacing: 1px;
    }
    .logo-text i {
      color: var(--gold);
      font-size: 2.2rem;
    }
    .nav-links {
      list-style: none;
      padding: 0;
      margin: 2rem 0;
    }
    .nav-links li {
      margin-bottom: 1.2rem;
    }
    .nav-links a {
      color: rgba(255,255,255,0.7);
      text-decoration: none;
      font-weight: 500;
      font-size: 1.1rem;
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 0.5rem 0;
      border-left: 3px solid transparent;
      padding-left: 1rem;
      transition: 0.2s;
    }
    .nav-links a:hover, .nav-links a.active {
      color: white;
      border-left-color: var(--bs-primary);
      background: rgba(224,60,49,0.1);
    }
    .hero-content {
      width: 60%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 3rem 4rem;
      position: relative;
      z-index: 5;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero-content::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(26,26,26,0.75);
      z-index: 0;
    }
    .hero-text {
      position: relative;
      z-index: 2;
      color: white;
    }
    .hero-text h1 span {
      color: var(--bs-primary);
    }
    .badge-row {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
      margin: 2rem 0;
    }
    /* 卡片通用 */
    .card-custom {
      background: white;
      border-radius: 16px;
      box-shadow: var(--card-shadow);
      transition: var(--transition-base);
      border: 1px solid rgba(0,0,0,0.04);
      height: 100%;
    }
    .card-custom:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-hover-shadow);
      border-color: var(--gold-light);
    }
    .card-img-top {
      border-radius: 16px 16px 0 0;
      height: 200px;
      object-fit: cover;
    }
    /* 价值主张卡片 */
    .value-card {
      background: white;
      border-radius: 20px;
      padding: 2rem 1.5rem;
      box-shadow: var(--card-shadow);
      transition: var(--transition-base);
    }
    .value-card:hover {
      box-shadow: var(--card-hover-shadow);
    }
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 0.8rem;
      box-shadow: 0 1px 6px rgba(0,0,0,0.04);
    }
    .faq-question {
      padding: 1.2rem 2rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--bs-dark);
    }
    .faq-answer {
      padding: 0 2rem 1.5rem;
      color: #4a4a4a;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-question i {
      transform: rotate(45deg);
    }
    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(90deg, #E03C31 0%, #C8963E 100%);
      border-radius: 20px;
      padding: 4rem 2rem;
      color: white;
      text-align: center;
    }
    footer {
      background: #1A1A1A;
      color: #ccc;
      padding: 4rem 0 1.5rem;
    }
    @media (max-width: 992px) {
      .hero-split {
        flex-direction: column;
      }
      .nav-side {
        width: 100%;
        padding: 1.5rem;
        flex-direction: row;
        flex-wrap: wrap;
        align-items: center;
        justify-content: space-between;
      }
      .hero-content {
        width: 100%;
        min-height: 70vh;
        padding: 2rem;
      }
      .nav-links {
        display: none;
      }
    }
    @media (max-width: 768px) {
      h1 { font-size: 2.2rem; }
      .section-title { font-size: 1.8rem; }
    }