/* roulang page: index */
/* ----- 设计变量与全局 Reset ----- */
    :root {
      --royal-blue: #1A1F36;
      --champagne-gold: #C8A96E;
      --amber-gold: #B8943F;
      --warm-bg: #FAF8F5;
      --soft-card: #F2EFEB;
      --text-dark: #2B2B2B;
      --text-muted: #5A5A5A;
      --white: #FFFFFF;
      --gold-light: rgba(200, 169, 110, 0.25);
      --shadow-card: 0 2px 12px rgba(26, 31, 54, 0.06);
      --shadow-hover: 0 8px 28px rgba(26, 31, 54, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --transition: 0.3s ease;
      --font-system: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "SF Pro Display", sans-serif;
      --max-width: 1280px;
      --nav-height: 68px;
      --section-gap: 100px;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--warm-bg);
    }

    body {
      font-family: var(--font-system);
      background-color: var(--warm-bg);
      color: var(--text-dark);
      line-height: 1.8;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

    a, button, input {
      font-family: inherit;
    }

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

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

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      transition: var(--transition);
      cursor: pointer;
      border: none;
      background: transparent;
      text-align: center;
      font-size: 16px;
      min-width: 140px;
    }
    .btn-primary {
      background-color: var(--champagne-gold);
      color: var(--text-dark);
      box-shadow: 0 4px 10px rgba(200, 169, 110, 0.18);
    }
    .btn-primary:hover {
      background-color: var(--amber-gold);
      transform: translateY(-2px);
      box-shadow: 0 9px 20px rgba(26, 31, 54, 0.15);
      color: #1e1e1e;
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--champagne-gold);
      color: var(--champagne-gold);
      padding: 12px 34px;
    }
    .btn-secondary:hover {
      background-color: rgba(200, 169, 110, 0.1);
      border-color: var(--amber-gold);
      color: var(--amber-gold);
      transform: translateY(-2px);
    }
    .btn-light {
      background: var(--white);
      color: var(--royal-blue);
      font-weight: 600;
    }
    .btn-light:hover {
      background-color: #f0ede6;
    }

    /* 区块标题 */
    .section-title {
      font-size: 30px;
      font-weight: 600;
      color: var(--royal-blue);
      margin-bottom: 18px;
      line-height: 1.3;
      letter-spacing: 0.5px;
    }
    .section-sub {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 620px;
      margin: 0 auto 48px auto;
      text-align: center;
      line-height: 1.7;
    }
    .section-header {
      text-align: center;
      margin-bottom: 50px;
    }

    /* ----- 导航（固定顶部） ----- */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      border-bottom: 1px solid #efeae1;
      z-index: 99;
      height: var(--nav-height);
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--royal-blue);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--champagne-gold);
      font-size: 26px;
      transform: rotate(45deg);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
      list-style: none;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 0;
      position: relative;
      transition: var(--transition);
    }
    .nav-links a::after {
      content: "";
      position: absolute;
      width: 0%;
      height: 2px;
      background: var(--champagne-gold);
      bottom: 0;
      left: 0;
      transition: width 0.3s;
    }
    .nav-links a:hover {
      color: var(--champagne-gold);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    /* 汉堡菜单 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--royal-blue);
      cursor: pointer;
    }

    /* Hero 区域 */
    .hero {
      min-height: 90vh;
      background: linear-gradient(rgba(26, 31, 54, 0.8), rgba(26, 31, 54, 0.82)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      margin-top: 0;
      padding: 140px 40px 100px;
      color: var(--white);
      position: relative;
      background-blend-mode: overlay;
    }
    .hero-content {
      max-width: 800px;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      color: white;
      text-shadow: 0 2px 12px rgba(0,0,0,0.3);
    }
    .hero .subtitle {
      font-size: 18px;
      color: #EFE0C6;
      margin-bottom: 36px;
    }
    .hero-btns {
      display: flex;
      gap: 22px;
      flex-wrap: wrap;
      justify-content: center;
    }

    /* 区块通用间距 */
    section {
      padding: 100px 40px;
    }

    /* 核心优势卡片（左金线条） */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: left;
    }
    .adv-card {
      background: var(--soft-card);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      border-left: 4px solid var(--champagne-gold);
      box-shadow: var(--shadow-card);
      transition: all 0.3s;
    }
    .adv-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-left-color: var(--amber-gold);
    }
    .adv-icon {
      font-size: 38px;
      color: var(--champagne-gold);
      margin-bottom: 16px;
    }
    .adv-card h3 {
      font-size: 21px;
      font-weight: 600;
      color: var(--royal-blue);
      margin-bottom: 12px;
    }

    /* 尊享服务大图卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 36px;
    }
    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .service-card img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .service-card:hover img {
      transform: scale(1.03);
    }
    .service-content {
      padding: 24px 22px;
      background: white;
    }
    .service-content h3 {
      font-size: 22px;
      color: var(--royal-blue);
      margin-bottom: 10px;
    }

    /* 权威数据 */
    .data-row {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      background: var(--soft-card);
      border-radius: var(--radius-card);
      padding: 48px 30px;
      text-align: center;
    }
    .data-item .number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--amber-gold);
    }

    /* 经典案例交错 */
    .case-row {
      display: flex;
      gap: 60px;
      align-items: center;
      margin-bottom: 48px;
    }
    .case-row.reverse {
      flex-direction: row-reverse;
    }
    .case-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      object-fit: cover;
      aspect-ratio: 4/3;
      box-shadow: var(--shadow-card);
    }
    .case-text {
      flex: 1;
    }

    /* 流程时间轴 */
    .timeline {
      position: relative;
      padding-left: 32px;
      border-left: 2px solid var(--champagne-gold);
      margin-top: 20px;
    }
    .timeline-step {
      margin-bottom: 42px;
      position: relative;
    }
    .step-dot {
      position: absolute;
      left: -42px;
      background: var(--champagne-gold);
      color: var(--royal-blue);
      width: 30px;
      height: 30px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }

    /* FAQ 手风琴 */
    .faq-item {
      background: var(--white);
      margin-bottom: 12px;
      border-radius: var(--radius-card);
      border: 1px solid #eae3d9;
    }
    .faq-question {
      padding: 16px 28px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    /* CTA 全域深色 */
    .cta-section {
      background: var(--royal-blue);
      text-align: center;
      color: white;
    }

    /* footer */
    .footer {
      background: #0e1320;
      color: #B0B0B0;
      padding: 50px 40px 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .advantages-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .hero h1 { font-size: 34px; }
      section { padding: 70px 20px; }
      .advantages-grid, .services-grid { grid-template-columns: 1fr; }
      .case-row { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }