/* roulang page: index */
/* :root 设计变量 */
    :root {
      --primary-deep: #1A1F36;
      --primary-dark: #252B45;
      --accent-orange: #E85D3F;
      --accent-hover: #D14A2F;
      --bg-warm: #F7F5F2;
      --card-white: #FFFFFF;
      --text-primary: #1A1F36;
      --text-secondary: #5A5F6E;
      --text-muted: #8B8F9A;
      --border-light: #E8E6E1;
      --card-shadow: 0 1px 3px rgba(26,31,54,0.06), 0 1px 2px rgba(26,31,54,0.04);
      --card-hover-shadow: 0 8px 24px rgba(26,31,54,0.10);
      --card-round: 12px;
      --btn-round: 8px;
      --font-cn: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
      --font-num: "Inter", "SF Pro Display", system-ui, sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-cn);
      line-height: 1.7;
      color: var(--text-primary);
      background-color: #fff;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    
    a, img, button, input {
      transition: all 0.25s ease;
    }
    
    img {
      max-width: 100%;
      height: auto;
    }
    
    /* 自定义容器微调 */
    .container {
      max-width: 1200px;
    }
    
    /* 版块间距 */
    section {
      padding: 80px 0;
    }
    
    @media (max-width: 768px) {
      section {
        padding: 56px 0;
      }
    }
    
    /* -------------------------------------------------- */
    /* 导航：卡片化导航面板 */
    .navbar-custom {
      background: var(--card-white);
      padding: 12px 0;
      border-radius: var(--card-round);
      box-shadow: var(--card-shadow);
      margin: 16px auto 0;
      position: sticky;
      top: 12px;
      z-index: 1020;
      backdrop-filter: blur(6px);
    }
    
    .navbar-custom .navbar-brand {
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary-deep);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    
    .navbar-custom .nav-link {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 8px 16px !important;
      border-radius: 8px;
      margin: 0 2px;
    }
    
    .navbar-custom .nav-link:hover,
    .navbar-custom .nav-link.active {
      color: var(--accent-orange);
      background: rgba(232,93,63,0.06);
    }
    
    .navbar-cta {
      background: var(--accent-orange);
      color: white !important;
      border-radius: var(--btn-round);
      padding: 10px 22px !important;
      font-weight: 600;
      box-shadow: 0 4px 10px rgba(232,93,63,0.25);
    }
    
    .navbar-cta:hover {
      background: var(--accent-hover);
      box-shadow: 0 6px 14px rgba(232,93,63,0.35);
      transform: translateY(-1px);
      color: white !important;
    }
    
    .navbar-toggler {
      border: none;
      box-shadow: none;
    }
    
    /* 移动端导航面板保持卡片风格 */
    @media (max-width: 991.98px) {
      .navbar-collapse {
        background: white;
        border-radius: var(--card-round);
        padding: 12px;
        margin-top: 10px;
        box-shadow: var(--card-shadow);
      }
    }
    
    /* -------------------------------------------------- */
    /* Hero 首屏 */
    #hero {
      background: linear-gradient(135deg, #1A1F36 0%, #252B45 100%);
      position: relative;
      overflow: hidden;
      padding: 100px 0 80px;
    }
    
    #hero::after {
      content: "";
      position: absolute;
      right: 0;
      top: 0;
      width: 45%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.35;
      mask-image: linear-gradient(to left, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0) 100%);
      -webkit-mask-image: linear-gradient(to left, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0) 100%);
    }
    
    .hero-content {
      position: relative;
      z-index: 2;
    }
    
    .hero-title {
      font-size: clamp(2rem, 5vw, 3rem);
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 1.2rem;
    }
    
    .hero-subtitle {
      font-size: 1.15rem;
      color: rgba(255,255,255,0.8);
      line-height: 1.7;
      margin-bottom: 2rem;
      max-width: 540px;
    }
    
    .btn-hero-primary {
      background: var(--accent-orange);
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--btn-round);
      border: none;
      font-size: 1rem;
    }
    
    .btn-hero-primary:hover {
      background: var(--accent-hover);
      color: white;
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(209,74,47,0.4);
    }
    
    .btn-hero-outline {
      border: 2px solid rgba(255,255,255,0.7);
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--btn-round);
      background: transparent;
      font-size: 1rem;
      margin-left: 12px;
    }
    
    .btn-hero-outline:hover {
      background: white;
      color: var(--primary-deep);
      border-color: white;
      transform: translateY(-2px);
    }
    
    .trust-badge {
      display: flex;
      gap: 32px;
      margin-top: 40px;
      flex-wrap: wrap;
    }
    
    .trust-item {
      color: rgba(255,255,255,0.75);
      font-size: 0.9rem;
      font-weight: 500;
    }
    
    .trust-item strong {
      color: white;
      font-size: 1.4rem;
      font-family: var(--font-num);
      margin-right: 4px;
    }
    
    @media (max-width: 768px) {
      #hero::after {
        width: 100%;
        opacity: 0.2;
      }
      .btn-hero-outline {
        margin-left: 0;
        margin-top: 12px;
      }
      .trust-badge {
        gap: 18px;
      }
    }
    
    /* -------------------------------------------------- */
    /* 区块标题 */
    .section-title h2 {
      font-size: clamp(1.6rem, 3vw, 2rem);
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 0.5rem;
    }
    
    .section-title p {
      color: var(--text-secondary);
      max-width: 600px;
      margin: 0 auto;
    }
    
    /* -------------------------------------------------- */
    /* 功能卡片 （非对称网格） */
    .feature-card {
      background: var(--card-white);
      border-radius: var(--card-round);
      padding: 28px 24px;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-light);
      transition: all 0.25s;
      height: 100%;
    }
    
    .feature-card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
      border-color: transparent;
    }
    
    .feature-icon {
      width: 48px;
      height: 48px;
      background: rgba(232,93,63,0.1);
      color: var(--accent-orange);
      font-size: 1.5rem;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 10px;
      margin-bottom: 18px;
    }
    
    .feature-card h3 {
      font-size: 1.3rem;
      font-weight: 600;
      margin-bottom: 10px;
    }
    
    .feature-card p {
      color: var(--text-secondary);
      line-height: 1.7;
      font-size: 0.95rem;
    }
    
    /* -------------------------------------------------- */
    /* 场景交替图文 */
    .scenario-row {
      align-items: center;
      margin-bottom: 50px;
    }
    
    .scenario-img {
      border-radius: var(--card-round);
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }
    
    .scenario-img img {
      width: 100%;
      height: auto;
      display: block;
    }
    
    .scenario-text h3 {
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 12px;
    }
    
    .scenario-text p {
      color: var(--text-secondary);
    }
    
    .tag-badge {
      background: #F7F5F2;
      color: var(--text-secondary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-right: 8px;
      font-weight: 500;
    }
    
    /* -------------------------------------------------- */
    /* 案例卡片 */
    .case-card {
      background: white;
      border-radius: var(--card-round);
      padding: 26px;
      box-shadow: var(--card-shadow);
      border-left: 4px solid var(--accent-orange);
      transition: 0.25s;
    }
    
    .case-card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-3px);
    }
    
    .case-number {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--accent-orange);
      font-family: var(--font-num);
      line-height: 1.2;
    }
    
    .case-label {
      color: var(--text-primary);
      font-weight: 600;
    }
    
    .case-quote {
      color: var(--text-secondary);
      font-style: italic;
      margin-top: 12px;
    }
    
    /* -------------------------------------------------- */
    /* 价格卡片 */
    .pricing-card {
      background: white;
      border-radius: var(--card-round);
      padding: 36px 24px;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-light);
      transition: 0.3s;
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    
    .pricing-card.featured {
      background: var(--primary-deep);
      color: white;
      border-color: var(--primary-deep);
      transform: scale(1.03);
      box-shadow: var(--card-hover-shadow);
    }
    
    .pricing-card h3 {
      font-weight: 700;
    }
    
    .pricing-amount {
      font-size: 2.8rem;
      font-weight: 700;
      font-family: var(--font-num);
      margin: 16px 0;
    }
    
    .pricing-card ul {
      list-style: none;
      padding: 0;
      margin: 24px 0;
    }
    
    .pricing-card li {
      padding: 8px 0;
      color: var(--text-secondary);
    }
    
    .pricing-card.featured li {
      color: rgba(255,255,255,0.85);
    }
    
    .btn-pricing {
      background: var(--accent-orange);
      color: white;
      font-weight: 600;
      border-radius: var(--btn-round);
      padding: 12px 24px;
      border: none;
    }
    
    .btn-pricing:hover {
      background: var(--accent-hover);
      color: white;
    }
    
    /* -------------------------------------------------- */
    /* FAQ 手风琴 */
    .accordion-custom .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-light);
      background: transparent;
    }
    
    .accordion-custom .accordion-button {
      font-weight: 600;
      color: var(--primary-deep);
      background: transparent;
      box-shadow: none;
      padding: 18px 0;
      font-size: 1.05rem;
    }
    
    .accordion-custom .accordion-button:not(.collapsed) {
      color: var(--accent-orange);
      background: transparent;
    }
    
    .accordion-custom .accordion-button::after {
      filter: brightness(0.5);
    }
    
    .accordion-body {
      color: var(--text-secondary);
      line-height: 1.8;
      padding: 0 0 18px;
    }
    
    /* -------------------------------------------------- */
    /* CTA 尾屏 */
    #contact {
      background: var(--primary-deep);
      color: white;
      border-radius: 32px 32px 0 0;
      margin-top: 20px;
      padding: 80px 0;
    }
    
    .contact-form-card {
      background: white;
      border-radius: var(--card-round);
      padding: 32px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    }
    
    .form-control-custom {
      border-radius: var(--btn-round);
      border: 1px solid var(--border-light);
      background: #F7F5F2;
      padding: 12px 16px;
    }
    
    .form-control-custom:focus {
      border-color: var(--accent-orange);
      box-shadow: 0 0 0 3px rgba(232,93,63,0.15);
      background: white;
    }
    
    .btn-submit {
      background: var(--accent-orange);
      color: white;
      font-weight: 700;
      border-radius: var(--btn-round);
      padding: 14px;
      border: none;
      width: 100%;
    }
    
    .btn-submit:hover {
      background: var(--accent-hover);
    }
    
    /* -------------------------------------------------- */
    /* 页脚 */
    footer {
      background: #141824;
      color: #B0B4C0;
      padding: 60px 0 20px;
    }
    
    footer a {
      color: #B0B4C0;
      text-decoration: none;
    }
    
    footer a:hover {
      color: white;
    }
    
    .footer-brand {
      font-size: 1.5rem;
      font-weight: 700;
      color: white;
    }
    
    .social-icon {
      width: 38px;
      height: 38px;
      background: var(--accent-orange);
      color: white;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-right: 8px;
    }
    .social-icon:hover {
      background: #d14a2f;
      color: white;
    }