/* roulang page: index */
:root {
      --deep-blue: #1A1A2E;
      --burning-gold: #D4AF37;
      --battle-red: #C0392B;
      --bg-light: #F8F9FA;
      --card-bg: #FFFFFF;
      --text-primary: #1A1A2E;
      --text-body: #4A4A4A;
      --text-muted: #7F8C8D;
      --text-light: #CCCCCC;
      --border-light: #EEEEEE;
      --shadow-sm: 0 4px 20px rgba(26,26,46,0.08);
      --shadow-hover: 0 8px 30px rgba(26,26,46,0.15);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-cn: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-en: "Inter", "SF Pro Display", system-ui, -apple-system, sans-serif;
      --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-cn);
      font-size: 16px;
      font-weight: 400;
      line-height: 1.75;
      color: var(--text-body);
      background-color: var(--bg-light);
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-cn);
      color: var(--text-primary);
      margin-top: 0;
    }

    h1 {
      font-size: 3.5rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }

    h2 {
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 1rem;
    }

    h3 {
      font-size: 1.375rem;
      font-weight: 600;
    }

    .section-container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    section {
      padding-top: 5rem;
      padding-bottom: 5rem;
    }

    /* 导航 */
    .site-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      z-index: 100;
      padding: 0.75rem 0;
    }

    .nav-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      font-family: var(--font-cn);
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--text-primary);
      text-decoration: none;
      white-space: nowrap;
    }

    .logo span {
      color: var(--burning-gold);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-links a {
      font-family: var(--font-cn);
      font-weight: 500;
      color: var(--text-primary);
      text-decoration: none;
      font-size: 0.95rem;
      position: relative;
      padding: 0.25rem 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--burning-gold);
      transition: width 0.25s ease;
    }

    .nav-links a:hover {
      color: var(--burning-gold);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-gold-sm {
      background: var(--burning-gold);
      color: var(--deep-blue) !important;
      font-weight: 700;
      padding: 0.5rem 1.4rem;
      border-radius: 30px;
      font-size: 0.9rem;
      transition: var(--transition-smooth);
      display: inline-block;
    }

    .btn-gold-sm:hover {
      background: #b4942e;
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--deep-blue);
      transition: 0.2s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: white;
      flex-direction: column;
      justify-content: center;
      align-items: flex-start;
      padding: 2rem;
      z-index: 99;
      gap: 2rem;
    }

    /* 按钮系统 */
    .btn {
      display: inline-block;
      font-family: var(--font-cn);
      font-weight: 700;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: var(--transition-smooth);
      cursor: pointer;
      border: none;
      padding: 0.9rem 2.2rem;
      font-size: 1rem;
    }

    .btn-primary {
      background: var(--burning-gold);
      color: var(--deep-blue);
    }

    .btn-primary:hover {
      background: #b4942e;
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(212,175,55,0.3);
      color: var(--deep-blue);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--burning-gold);
      color: var(--burning-gold);
    }

    .btn-outline:hover {
      background: var(--burning-gold);
      color: var(--deep-blue);
    }

    /* Hero */
    #hero {
      padding-top: 7rem;
      background: var(--bg-light);
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }

    .hero-text {
      flex: 1;
    }

    .hero-text h1 {
      color: var(--deep-blue);
      margin-bottom: 1.5rem;
    }

    .hero-text h1 .gold-line {
      color: var(--burning-gold);
      display: block;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
      max-width: 90%;
    }

    .hero-image {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 380px;
      border-radius: 24px;
      position: relative;
      overflow: hidden;
      box-shadow: 0 20px 35px rgba(0,0,0,0.2);
    }

    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,26,46,0.5) 0%, rgba(0,0,0,0.2) 100%);
    }

    .cta-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    /* 卡片 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      transition: var(--transition-smooth);
      height: 100%;
    }

    .card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }

    .icon-circle {
      width: 56px;
      height: 56px;
      background: #f0f2f5;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.5rem;
      color: var(--burning-gold);
      font-size: 1.8rem;
    }

    /* 服务卡片 */
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .service-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      position: relative;
    }

    /* 数据条 */
    #stats {
      background: var(--deep-blue);
      color: white;
    }

    .stat-number {
      font-family: var(--font-en);
      font-size: 2.8rem;
      font-weight: 800;
      color: white;
    }

    .stat-unit {
      color: var(--burning-gold);
    }

    /* 流程 */
    .process-step {
      position: relative;
      text-align: center;
    }

    .step-number {
      font-family: var(--font-en);
      font-size: 4.5rem;
      font-weight: 800;
      color: rgba(212,175,55,0.15);
      position: absolute;
      top: -30px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 0;
    }

    /* FAQ */
    .accordion-item {
      background: white;
      border-radius: 10px;
      margin-bottom: 0.8rem;
      border-left: 4px solid var(--burning-gold);
    }

    .accordion-title {
      font-weight: 600;
      font-size: 1.1rem;
      padding: 1.2rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    /* CTA */
    #cta {
      background: var(--deep-blue);
    }

    #footer {
      background: var(--deep-blue);
      color: var(--text-light);
    }

    @media (max-width: 1024px) {
      h1 { font-size: 2.8rem; }
      .hero-grid { flex-direction: column; }
    }

    @media (max-width: 640px) {
      h1 { font-size: 2rem; }
      h2 { font-size: 1.8rem; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-image { min-height: 250px; }
      section { padding-top: 3rem; padding-bottom: 3rem; }
    }