/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary-green: #0A4D3C;
      --primary-dark: #07382B;
      --accent-gold: #C8A96E;
      --accent-gold-hover: #B8934A;
      --bg-warm: #FAF8F5;
      --bg-light: #F5F2ED;
      --bg-white: #FFFFFF;
      --text-title: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #8C8C8C;
      --text-light: #FFFFFF;
      --text-light-muted: #E0D6C2;
      --border-light: #EBE7E0;
      --border-card: #EBE7E0;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 8px 32px rgba(0,0,0,0.10);
      --shadow-nav: 0 2px 16px rgba(0,0,0,0.05);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 8px;
      --font-serif: 'Noto Serif SC', 'Source Han Serif', 'Times New Roman', serif;
      --font-sans: 'Inter', 'Noto Sans SC', 'Source Han Sans', system-ui, -apple-system, sans-serif;
      --max-width: 1280px;
      --section-gap: 120px;
      --section-gap-mobile: 80px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      background-color: var(--bg-warm);
    }
    body {
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-body);
      background-color: var(--bg-warm);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
      transition: all 0.25s ease;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    /* 排版 */
    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      color: var(--text-title);
      line-height: 1.2;
      font-weight: 600;
    }
    h1 {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.1;
    }
    h2 {
      font-size: 40px;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 24px;
      line-height: 1.3;
    }
    h4 {
      font-size: 18px;
      font-weight: 500;
    }
    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      h2 { font-size: 32px; }
    }
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      h3 { font-size: 20px; }
    }

    /* 导航 - 白底平台吸顶导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(12px);
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid var(--border-light);
      box-shadow: none;
      transition: box-shadow 0.3s ease;
    }
    .site-header.scrolled {
      box-shadow: var(--shadow-nav);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-family: var(--font-serif);
      font-size: 24px;
      font-weight: 700;
      color: var(--primary-green);
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      display: inline-block;
      width: 28px;
      height: 28px;
      border: 2px solid var(--primary-green);
      border-radius: 50%;
      position: relative;
    }
    .logo-icon::after {
      content: "";
      position: absolute;
      top: 4px;
      left: 4px;
      width: 16px;
      height: 16px;
      border: 2px solid var(--accent-gold);
      border-radius: 50%;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent-gold);
      transform: scaleX(0);
      transform-origin: center;
      transition: transform 0.25s ease;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-green);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      transform: scaleX(1);
    }
    .mobile-menu-btn {
      display: none;
      font-size: 24px;
      color: var(--primary-green);
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .mobile-nav {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(12px);
        padding: 24px 20px;
        gap: 20px;
        border-bottom: 1px solid var(--border-light);
        transform: translateY(-100%);
        opacity: 0;
        transition: all 0.3s ease;
        pointer-events: none;
      }
      .mobile-nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
      }
      .mobile-nav a {
        font-size: 20px;
        font-weight: 500;
        color: var(--text-title);
      }
    }

    /* Hero 首屏 */
    .hero {
      background: linear-gradient(135deg, #0A4D3C 0%, #07382B 100%);
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: center;
      min-height: 90vh;
      padding: 120px 0 80px;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: -20%;
      right: -10%;
      width: 60%;
      height: 120%;
      background: radial-gradient(circle at 20% 30%, rgba(200,169,110,0.08) 0%, transparent 60%);
      border-radius: 50%;
      z-index: 0;
    }
    .hero-container {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }
    .hero-left {
      flex: 5;
    }
    .hero-right {
      flex: 7;
      position: relative;
    }
    .hero h1 {
      color: var(--text-light);
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 40px;
      line-height: 1.6;
      max-width: 420px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-gold);
      color: #FFFFFF;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      letter-spacing: 0.5px;
      transition: all 0.25s;
      display: inline-block;
      border: 2px solid var(--accent-gold);
    }
    .btn-primary:hover {
      background: var(--accent-gold-hover);
      border-color: var(--accent-gold-hover);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      color: #FFFFFF;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      letter-spacing: 0.5px;
      border: 2px solid var(--accent-gold);
      transition: all 0.25s;
    }
    .btn-outline:hover {
      background: rgba(200,169,110,0.15);
      transform: scale(1.02);
    }
    .hero-img {
      width: 100%;
      border-radius: var(--radius-img);
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      position: relative;
    }
    .hero-img img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }
    .hero-img::after {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(to right, rgba(10,77,60,0.3) 0%, transparent 70%);
    }
    @media (max-width: 768px) {
      .hero-container {
        flex-direction: column;
        text-align: center;
      }
      .hero-left, .hero-right {
        flex: unset;
        width: 100%;
      }
      .hero-sub {
        max-width: 100%;
      }
      .hero-buttons {
        justify-content: center;
      }
      .hero-right {
        margin-top: 32px;
      }
      .hero-img {
        height: 280px;
      }
      .hero-img img {
        height: 100%;
        object-fit: cover;
      }
    }

    /* 通用板块 */
    section {
      padding: var(--section-gap) 0;
    }
    @media (max-width: 768px) {
      section {
        padding: var(--section-gap-mobile) 0;
      }
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      display: inline-block;
      position: relative;
    }
    .section-title .gold-line {
      width: 40px;
      height: 2px;
      background: var(--accent-gold);
      margin: 12px auto 0;
    }

    /* 核心服务 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      border-left: 4px solid var(--primary-green);
      position: relative;
      overflow: hidden;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
      border-left-width: 8px;
    }
    .service-number {
      font-size: 48px;
      font-weight: 700;
      color: rgba(200,169,110,0.25);
      font-family: 'Inter', sans-serif;
      line-height: 1;
      margin-bottom: 16px;
    }
    .service-card h3 {
      margin-bottom: 12px;
      color: var(--text-title);
    }
    .service-card p {
      color: var(--text-body);
      font-size: 15px;
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 联盟优势 */
    .advantages-bg {
      background: var(--bg-light);
    }
    .adv-grid {
      display: flex;
      gap: 60px;
      align-items: center;
    }
    .adv-stats {
      display: flex;
      gap: 40px;
      flex: 1;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 64px;
      font-weight: 700;
      color: var(--accent-gold);
      font-family: 'Inter', sans-serif;
      line-height: 1.1;
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 8px;
    }
    .adv-text {
      flex: 1;
    }
    .adv-text h3 {
      margin-bottom: 16px;
    }
    .adv-list {
      list-style: none;
    }
    .adv-list li {
      padding-left: 20px;
      position: relative;
      margin-bottom: 10px;
      color: var(--text-body);
    }
    .adv-list li::before {
      content: "";
      position: absolute;
      left: 0;
      top: 8px;
      width: 8px;
      height: 8px;
      background: var(--primary-green);
      border-radius: 50%;
    }
    @media (max-width: 768px) {
      .adv-grid {
        flex-direction: column;
      }
      .adv-stats {
        justify-content: center;
      }
      .stat-number {
        font-size: 40px;
      }
    }

    /* 合作案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .case-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      display: flex;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .case-img {
      width: 40%;
      position: relative;
      overflow: hidden;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: 0.3s;
    }
    .case-img::after {
      content: "";
      position: absolute;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background: rgba(10,77,60,0.2);
      transition: 0.3s;
    }
    .case-card:hover .case-img::after {
      background: transparent;
    }
    .case-info {
      padding: 28px;
      width: 60%;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .case-info h3 {
      margin-bottom: 8px;
    }
    .case-link {
      color: var(--accent-gold);
      font-weight: 600;
      margin-top: 12px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
      .case-card {
        flex-direction: column;
      }
      .case-img, .case-info {
        width: 100%;
      }
      .case-img {
        height: 200px;
      }
    }

    /* 解决方案 */
    .solution-flex {
      display: flex;
      gap: 40px;
    }
    .steps {
      flex: 8;
      display: flex;
      justify-content: space-between;
      position: relative;
      padding: 20px 0;
    }
    .step-item {
      text-align: center;
      position: relative;
      z-index: 2;
      flex:1;
    }
    .step-circle {
      width: 64px;
      height: 64px;
      border: 2px solid var(--primary-green);
      border-radius: 50%;
      background: white;
      margin: 0 auto 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary-green);
    }
    .step-text {
      font-weight: 500;
    }
    .steps::before {
      content: "";
      position: absolute;
      top: 52px;
      left: 10%;
      width: 80%;
      height: 2px;
      border-top: 2px dashed var(--accent-gold);
      z-index: 1;
    }
    .solution-index {
      flex: 4;
    }
    @media (max-width: 768px) {
      .solution-flex {
        flex-direction: column;
      }
      .steps {
        flex-direction: column;
        gap: 24px;
      }
      .steps::before {
        display: none;
      }
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      color: var(--text-title);
    }
    .faq-icon {
      width: 28px;
      height: 28px;
      background: var(--primary-green);
      border-radius: 50%;
      color: white;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
      padding-right: 40px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      background: var(--accent-gold);
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0A4D3C, #07382B);
      text-align: center;
    }
    .cta-title {
      color: white;
      margin-bottom: 16px;
    }
    .cta-sub {
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
    }
    .phone-hint {
      color: var(--text-light-muted);
      margin-top: 16px;
      font-size: 14px;
    }

    /* Footer */
    .footer {
      background: #1A1A1A;
      color: #B0B0B0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-family: var(--font-serif);
      font-size: 22px;
      color: white;
      font-weight: 700;
    }
    .footer h4 {
      color: white;
      margin-bottom: 16px;
    }
    .footer a {
      color: #B0B0B0;
      display: block;
      margin-bottom: 8px;
    }
    .footer a:hover {
      color: var(--accent-gold);
    }
    .copyright {
      border-top: 1px solid #333;
      padding-top: 24px;
      text-align: center;
      font-size: 14px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }