/* roulang page: index */
:root {
      --primary: #0F6B3E;
      --primary-light: #0B8A54;
      --accent: #F5A623;
      --accent-hover: #E5941A;
      --dark-bg: #0B1A2D;
      --dark-secondary: #132B44;
      --surface: #F7F9FC;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --text-light: #CBD5E1;
      --white: #FFFFFF;
      --glass-border: rgba(255,255,255,0.12);
      --glass-bg: rgba(255,255,255,0.06);
      --glass-dark: rgba(11,26,45,0.7);
      --radius-card: 16px;
      --radius-btn: 10px;
      --radius-tag: 20px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.12);
      --shadow-btn: 0 6px 20px rgba(15,107,62,0.35);
      --font-heading: 'PingFang SC','Microsoft YaHei','Noto Sans SC',sans-serif;
      --font-body: 'Inter','PingFang SC','Microsoft YaHei',sans-serif;
      --max-width: 1280px;
      --header-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      scroll-padding-top: var(--header-height);
    }
    body {
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-main);
      background-color: var(--white);
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    h1, h2, h3 {
      font-family: var(--font-heading);
      font-weight: 700;
    }
    h1 {
      font-size: 48px;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }
    h2 {
      font-size: 36px;
      line-height: 1.3;
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
      line-height: 1.4;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      transition: all 0.3s ease;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      border-radius: var(--radius-btn);
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(11,26,45,0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      z-index: 1000;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-heading);
      font-size: 20px;
      font-weight: 700;
      color: var(--white);
      letter-spacing: 0.3px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }
    .logo-icon::before {
      content: "⛰️";
      filter: grayscale(0.2);
      font-size: 18px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-light);
      padding: 8px 0;
      position: relative;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }
    .nav-menu a:hover {
      color: var(--white);
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .btn-nav-cta {
      background: var(--accent);
      color: #0B1A2D;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-btn);
      white-space: nowrap;
    }
    .btn-nav-cta:hover {
      background: #FFB83B;
      box-shadow: 0 0 18px rgba(245,166,35,0.5);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: white;
      border-radius: 2px;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: var(--header-height);
      left: 0;
      width: 100%;
      background: rgba(11,26,45,0.96);
      backdrop-filter: blur(24px);
      padding: 32px 24px;
      flex-direction: column;
      gap: 24px;
      z-index: 999;
      border-top: 1px solid rgba(255,255,255,0.1);
    }
    .mobile-menu a {
      font-size: 18px;
      color: var(--text-light);
      font-weight: 500;
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0B1A2D 0%, #132B44 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: var(--header-height);
      position: relative;
      overflow: hidden;
    }
    .hero::after {
      content: '';
      position: absolute;
      bottom: 0;
      right: 0;
      width: 450px;
      height: 450px;
      background: radial-gradient(circle, rgba(15,107,62,0.35) 0%, transparent 70%);
      border-radius: 50%;
      filter: blur(40px);
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      color: white;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.7);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 24px;
    }
    .btn-primary {
      background: linear-gradient(135deg, #0F6B3E, #0B8A54);
      color: white;
      padding: 14px 32px;
      font-size: 16px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-primary:hover {
      box-shadow: 0 0 24px rgba(15,107,62,0.7);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid white;
      color: white;
      padding: 14px 32px;
    }
    .btn-outline:hover {
      background: white;
      color: #0B1A2D;
    }
    .trust-text {
      color: rgba(255,255,255,0.6);
      font-size: 14px;
    }
    .hero-image {
      flex: 1;
      display: flex;
      justify-content: center;
      position: relative;
    }
    .hero-image img {
      max-height: 480px;
      border-radius: 24px;
      border: 1px solid rgba(255,255,255,0.15);
      backdrop-filter: blur(8px);
      background: rgba(255,255,255,0.04);
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 56px;
    }
    .section-title h2 {
      color: var(--text-main);
    }
    .dark-section {
      background-color: var(--dark-bg);
      color: white;
    }
    .dark-section h2, .dark-section h3 {
      color: white;
    }
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      transition: all 0.3s ease;
    }
    .service-card:hover {
      transform: translateY(-8px);
      border-color: rgba(255,255,255,0.25);
      box-shadow: var(--shadow-card);
    }
    .service-icon {
      font-size: 38px;
      color: var(--accent);
      margin-bottom: 20px;
    }
    .service-card h3 {
      margin-bottom: 12px;
    }
    .service-card p {
      color: var(--text-muted);
      font-size: 15px;
      margin-bottom: 18px;
    }
    .text-link {
      color: var(--accent);
      font-weight: 600;
      font-size: 15px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .text-link:hover {
      gap: 10px;
      color: #FFB83B;
    }
    /* 优势数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .stat-item .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    .stat-label {
      color: rgba(255,255,255,0.7);
      margin-top: 8px;
    }
    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
    }
    .case-card {
      display: flex;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid rgba(0,0,0,0.04);
      transition: 0.3s;
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card);
    }
    .case-img {
      width: 45%;
      object-fit: cover;
    }
    .case-content {
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .case-tag {
      background: rgba(15,107,62,0.1);
      color: var(--primary);
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      display: inline-block;
      margin-top: 12px;
    }
    /* 流程 */
    .steps-row {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
    }
    .step {
      text-align: center;
      flex: 1;
      position: relative;
    }
    .step-circle {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 20px;
      margin: 0 auto 16px;
    }
    .step h3 {
      margin-bottom: 8px;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #E2E8F0;
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
      margin-top: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0B1A2D, #0F3B2C);
      text-align: center;
    }
    .btn-cta-large {
      background: var(--accent);
      color: #0B1A2D;
      padding: 18px 42px;
      font-size: 18px;
      font-weight: 700;
      margin-top: 28px;
    }
    .btn-cta-large:hover {
      box-shadow: 0 0 28px rgba(245,166,35,0.8);
    }
    /* 页脚 */
    .footer {
      background: #0A1520;
      color: #94A3B8;
      padding: 70px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: 1fr 1fr; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      .nav-menu { display: none; }
      .btn-nav-cta.desktop { display: none; }
      .hamburger { display: flex; }
      .hero .container { flex-direction: column; text-align: center; }
      .services-grid, .cases-grid, .footer-grid { grid-template-columns: 1fr; }
      .steps-row { flex-direction: column; gap: 32px; }
      .case-card { flex-direction: column; }
      .case-img { width: 100%; height: 200px; }
    }