/* roulang page: index */
:root {
      --primary: #0B2B26;
      --primary-light: #1A4A3C;
      --accent: #D4AF37;
      --bg: #F5F7FA;
      --card-bg: #FFFFFF;
      --text: #1A1A1A;
      --text-secondary: #5A5A5A;
      --gradient-hero: linear-gradient(135deg, #0B2B26 0%, #1A4A3C 100%);
      --gradient-cta: linear-gradient(135deg, #0B2B26 0%, #D4AF37 100%);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --border-radius-card: 16px;
      --border-radius-btn: 30px;
      --transition: 0.3s ease;
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 70px;
      background: #fff;
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
      display: flex;
      align-items: center;
      z-index: 1000;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
    }
    .logo span {
      color: var(--accent);
      font-size: 1.3rem;
      font-weight: 600;
      margin-left: 4px;
    }
    .nav-menu {
      display: flex;
      gap: 2rem;
      list-style: none;
    }
    .nav-menu a {
      text-decoration: none;
      color: var(--text);
      font-size: 0.95rem;
      font-weight: 500;
      position: relative;
      padding-bottom: 4px;
      transition: color var(--transition);
    }
    .nav-menu a:hover {
      color: var(--primary);
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width var(--transition);
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      font-size: 1.6rem;
      cursor: pointer;
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--primary);
        flex-direction: column;
        padding: 1.5rem 0;
        gap: 0;
      }
      .nav-menu.active {
        display: flex;
      }
      .nav-menu li {
        text-align: center;
        padding: 1rem 0;
        border-bottom: 1px solid rgba(212,175,55,0.3);
      }
      .nav-menu a {
        color: #fff;
        font-size: 1.1rem;
      }
      .nav-menu a:hover {
        color: var(--accent);
      }
      .hamburger {
        display: block;
      }
    }
    /* Hero */
    .hero {
      background: var(--gradient-hero);
      position: relative;
      overflow: hidden;
      margin-top: 70px;
      padding: 80px 0;
      color: #fff;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: -20%;
      right: -10%;
      width: 60%;
      height: 120%;
      background: radial-gradient(circle at 30% 40%, rgba(212,175,55,0.15) 0%, transparent 70%);
      transform: rotate(10deg);
      pointer-events: none;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 2rem;
      position: relative;
    }
    .hero-text {
      flex: 1;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1.2rem;
    }
    .hero p {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      border: none;
      color: #0B2B26;
      padding: 0.8rem 2.2rem;
      border-radius: var(--border-radius-btn);
      font-weight: 700;
      cursor: pointer;
      transition: all var(--transition);
      text-decoration: none;
      display: inline-block;
      box-shadow: 0 4px 10px rgba(212,175,55,0.3);
    }
    .btn-primary:hover {
      background: #c9a82e;
      box-shadow: 0 0 14px rgba(212,175,55,0.5);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid #fff;
      color: #fff;
      padding: 0.8rem 2.2rem;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: all var(--transition);
      text-decoration: none;
    }
    .btn-outline:hover {
      background: #fff;
      color: var(--primary);
    }
    .hero-image img {
      max-width: 320px;
      border-radius: 24px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.25);
    }
    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero h1 {
        font-size: 2.2rem;
      }
      .hero-image img {
        max-width: 240px;
        margin-top: 1.5rem;
      }
    }
    /* 通用区块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 0.8rem;
      color: var(--primary);
    }
    .section-subtitle {
      text-align: center;
      color: var(--text-secondary);
      margin-bottom: 3rem;
      font-size: 1.1rem;
    }
    .grid-3, .grid-4 {
      display: grid;
      gap: 2rem;
    }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
    .card {
      background: var(--card-bg);
      border-radius: var(--border-radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      text-align: center;
    }
    .card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 55px;
      height: 55px;
      background: rgba(212,175,55,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1.2rem;
      font-size: 1.8rem;
      color: var(--accent);
    }
    .card h3 {
      font-size: 1.3rem;
      margin-bottom: 0.8rem;
      font-weight: 600;
    }
    .card p {
      color: var(--text-secondary);
      font-size: 0.95rem;
    }
    @media (max-width: 768px) {
      .grid-3, .grid-4 { grid-template-columns: 1fr; }
      section { padding: 60px 0; }
      .section-title { font-size: 1.9rem; }
    }
    /* 服务卡片带背景 */
    .service-card {
      background-size: cover;
      background-position: center;
      border-radius: 20px;
      height: 260px;
      position: relative;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      padding: 1.8rem;
      color: #fff;
      transition: all 0.3s;
    }
    .service-card::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(0deg, rgba(11,43,38,0.75) 20%, transparent 70%);
      transition: 0.3s;
    }
    .service-card:hover::before {
      background: linear-gradient(0deg, rgba(11,43,38,0.9) 30%, rgba(0,0,0,0.4) 100%);
    }
    .service-card h3, .service-card p, .service-card a {
      position: relative;
      z-index: 2;
    }
    .service-card h3 {
      font-size: 1.5rem;
      margin-bottom: 0.4rem;
    }
    .service-btn {
      align-self: flex-start;
      border: 1px solid var(--accent);
      color: var(--accent);
      padding: 0.4rem 1.6rem;
      border-radius: 20px;
      text-decoration: none;
      font-weight: 600;
      margin-top: 0.8rem;
      transition: 0.3s;
    }
    .service-btn:hover {
      background: var(--accent);
      color: #0B2B26;
    }
    /* 数据墙 */
    .data-wall {
      background: var(--primary);
      padding: 50px 0;
      color: #fff;
    }
    .data-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
    }
    .data-item {
      padding: 1rem;
    }
    .data-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent);
    }
    .data-label {
      font-size: 1rem;
      opacity: 0.85;
    }
    .divider {
      width: 1px;
      background: rgba(212,175,55,0.4);
    }
    /* 合作伙伴 */
    .partner-logos img {
      width: 100%;
      max-width: 140px;
      filter: grayscale(1);
      opacity: 0.7;
      transition: 0.3s;
    }
    .partner-logos img:hover {
      filter: grayscale(0);
      opacity: 1;
    }
    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      position: relative;
    }
    .step {
      text-align: center;
      flex: 1;
      position: relative;
    }
    .step-badge {
      width: 48px;
      height: 48px;
      background: var(--accent);
      color: #0B2B26;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.3rem;
      margin: 0 auto 0.8rem;
    }
    @media (max-width: 768px) {
      .steps {
        flex-direction: column;
        gap: 2rem;
      }
    }
    /* FAQ */
    .faq-item {
      background: #fff;
      border-radius: 12px;
      margin-bottom: 0.8rem;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      overflow: hidden;
    }
    .faq-question {
      padding: 1.2rem 1.5rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      border-left: 4px solid var(--accent);
    }
    .faq-answer {
      padding: 0 1.5rem 1.2rem;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-band {
      background: var(--gradient-cta);
      text-align: center;
      color: #fff;
      padding: 70px 0;
    }
    .cta-band h2 {
      font-size: 2.3rem;
    }
    .footer {
      background: #1A1A1A;
      color: #ccc;
      padding: 3rem 0 1.5rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    .footer a {
      color: #ccc;
      text-decoration: none;
    }
    .footer a:hover {
      color: var(--accent);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .data-grid {
        flex-direction: column;
      }
    }