/* roulang page: index */
:root {
      --william-green: #2E4A3F;
      --parchment: #F7F3EB;
      --copper-gold: #B8863C;
      --ink: #1C1C1E;
      --stone-gray: #D9D1C7;
      --moss-green: #4A6B5F;
      --copper-deep: #A07530;
      --white: #FFFFFF;
      --shadow-sm: 0 2px 12px rgba(28,28,30,0.06);
      --shadow-md: 0 6px 24px rgba(28,28,30,0.12);
      --radius: 6px;
      --transition: all 0.25s ease;
      --serif: 'Noto Serif SC', 'Times New Roman', 'Songti SC', '华文宋体', '方正雅宋', serif;
      --sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }

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

    body {
      font-family: var(--sans);
      font-size: 16px;
      line-height: 1.7;
      background-color: var(--parchment);
      color: var(--ink);
      -webkit-font-smoothing: antialiased;
      padding-top: 72px;
      overflow-x: hidden;
    }

    @media (max-width: 639px) {
      body {
        padding-top: 56px;
        padding-bottom: 70px;
      }
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 桌面导航 */
    .desktop-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: var(--parchment);
      border-bottom: 1px solid var(--stone-gray);
      z-index: 100;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 40px;
      backdrop-filter: blur(12px);
    }

    .brand {
      font-family: var(--serif);
      font-size: 24px;
      font-weight: 700;
      color: var(--william-green);
      letter-spacing: 1px;
      text-decoration: none;
    }

    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
    }

    .nav-links a {
      color: var(--ink);
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 4px 0;
      transition: var(--transition);
    }

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

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

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

    .nav-cta {
      background: var(--copper-gold);
      color: var(--parchment) !important;
      padding: 10px 22px !important;
      border-radius: var(--radius);
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
    }

    .nav-cta:hover {
      background: var(--copper-deep);
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--william-green);
      cursor: pointer;
    }

    @media (max-width: 1024px) {
      .desktop-nav {
        padding: 0 20px;
      }
      .nav-links {
        gap: 20px;
      }
    }

    @media (max-width: 639px) {
      .desktop-nav {
        height: 56px;
        justify-content: space-between;
      }
      .nav-links {
        display: none;
        position: fixed;
        top: 56px;
        left: 0;
        width: 100%;
        background: var(--parchment);
        flex-direction: column;
        padding: 20px;
        gap: 16px;
        border-bottom: 1px solid var(--stone-gray);
        z-index: 99;
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
    }

    /* 移动底部 Tab */
    .mobile-bottom-tab {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: var(--parchment);
      border-top: 1px solid var(--stone-gray);
      z-index: 100;
      justify-content: space-around;
      padding: 8px 0 12px;
      backdrop-filter: blur(12px);
    }

    .tab-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--ink);
      text-decoration: none;
      font-size: 10px;
      font-weight: 500;
      transition: var(--transition);
    }

    .tab-item i {
      font-size: 20px;
      margin-bottom: 2px;
      color: var(--ink);
    }

    .tab-item.active i,
    .tab-item:hover i {
      color: var(--copper-gold);
    }

    @media (max-width: 639px) {
      .mobile-bottom-tab {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(rgba(28,28,30,0.65), rgba(28,28,30,0.7)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: var(--white);
      position: relative;
    }

    .hero-content {
      max-width: 800px;
      padding: 40px 20px;
    }

    .hero h1 {
      font-family: var(--serif);
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      color: var(--white);
    }

    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 36px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--copper-gold);
      color: var(--parchment);
      padding: 14px 32px;
      border-radius: var(--radius);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--copper-deep);
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--copper-gold);
      color: var(--copper-gold);
      padding: 12px 30px;
      border-radius: var(--radius);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
    }

    .btn-outline:hover {
      background: rgba(184,134,60,0.1);
      transform: translateY(-2px);
    }

    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      font-size: 32px;
      color: var(--copper-gold);
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% { opacity: 0.5; transform: translateX(-50%) translateY(0); }
      50% { opacity: 1; transform: translateX(-50%) translateY(5px); }
      100% { opacity: 0.5; transform: translateX(-50%) translateY(0); }
    }

    @media (max-width: 639px) {
      .hero h1 {
        font-size: 36px;
      }
      .hero-buttons .btn-primary,
      .hero-buttons .btn-outline {
        width: 100%;
        text-align: center;
      }
    }

    /* 通用板块 */
    .section {
      padding: 100px 0;
    }

    .section-dark {
      background: var(--ink);
      color: var(--white);
    }

    .section-title {
      font-family: var(--serif);
      font-size: 34px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--william-green);
    }

    .section-dark .section-title {
      color: var(--white);
    }

    .section-sub {
      font-size: 18px;
      color: var(--ink);
      opacity: 0.75;
      margin-bottom: 48px;
    }

    .section-dark .section-sub {
      color: rgba(255,255,255,0.75);
    }

    @media (max-width: 639px) {
      .section {
        padding: 70px 0;
      }
      .section-title {
        font-size: 28px;
      }
    }

    /* 非对称优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .adv-main {
      grid-row: span 2;
      background: var(--white);
      padding: 40px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--stone-gray);
    }

    .adv-secondary {
      background: var(--white);
      padding: 28px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--stone-gray);
    }

    .adv-icon {
      font-size: 40px;
      color: var(--copper-gold);
      margin-bottom: 20px;
    }

    .adv-title {
      font-family: var(--serif);
      font-size: 22px;
      font-weight: 700;
      color: var(--william-green);
      margin-bottom: 12px;
    }

    @media (max-width: 768px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
      .adv-main {
        grid-row: span 1;
      }
    }

    /* 数据区 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-family: var(--sans);
      font-size: 48px;
      font-weight: 700;
      color: var(--copper-gold);
    }

    .stat-label {
      font-size: 14px;
      color: var(--white);
      opacity: 0.85;
    }

    /* 图文交错服务 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }

    .service-row.reverse {
      flex-direction: row-reverse;
    }

    .service-img {
      flex: 1;
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

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

    .service-text {
      flex: 1;
    }

    .service-text h3 {
      font-family: var(--serif);
      font-size: 24px;
      color: var(--william-green);
      margin-bottom: 16px;
    }

    .service-list {
      list-style: none;
      padding: 0;
    }

    .service-list li {
      padding-left: 24px;
      position: relative;
      margin-bottom: 10px;
    }

    .service-list li::before {
      content: '•';
      color: var(--copper-gold);
      font-size: 20px;
      position: absolute;
      left: 0;
      top: -2px;
    }

    @media (max-width: 768px) {
      .service-row,
      .service-row.reverse {
        flex-direction: column;
        gap: 30px;
      }
    }

    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .case-card {
      background: var(--white);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid var(--stone-gray);
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .case-img {
      height: 200px;
      overflow: hidden;
    }

    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .case-body {
      padding: 20px;
    }

    .case-tag {
      background: var(--moss-green);
      color: var(--white);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      display: inline-block;
      margin-bottom: 10px;
    }

    .case-title {
      font-family: var(--serif);
      font-size: 20px;
      margin-bottom: 8px;
    }

    @media (max-width: 768px) {
      .case-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      position: relative;
    }

    .steps::before {
      content: '';
      position: absolute;
      top: 30px;
      left: 10%;
      width: 80%;
      height: 2px;
      border-top: 2px dashed var(--copper-gold);
    }

    .step {
      text-align: center;
      z-index: 1;
      background: var(--parchment);
      padding: 0 15px;
    }

    .step-circle {
      width: 60px;
      height: 60px;
      border: 2px solid var(--copper-gold);
      border-radius: 50%;
      line-height: 56px;
      font-weight: 700;
      color: var(--copper-gold);
      margin: 0 auto 15px;
      background: var(--parchment);
    }

    @media (max-width: 768px) {
      .steps {
        flex-direction: column;
        gap: 30px;
      }
      .steps::before {
        display: none;
      }
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--stone-gray);
    }

    .faq-question {
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      padding: 20px 10px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .faq-answer {
      padding: 0 10px 20px;
      display: none;
    }

    .faq-answer.open {
      display: block;
    }

    /* 联系表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
    }

    .contact-info i {
      color: var(--copper-gold);
      margin-right: 10px;
    }

    @media (max-width: 768px) {
      .contact-grid {
        grid-template-columns: 1fr;
      }
    }

    input, textarea {
      border: 1px solid var(--stone-gray);
      border-radius: var(--radius);
      padding: 12px;
      width: 100%;
      margin-bottom: 16px;
      font-family: inherit;
    }

    input:focus, textarea:focus {
      outline: none;
      border-color: var(--copper-gold);
      box-shadow: 0 0 0 3px rgba(184,134,60,0.2);
    }

    /* 页脚 */
    .footer {
      background: var(--william-green);
      color: rgba(255,255,255,0.85);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-brand {
      font-family: var(--serif);
      font-size: 22px;
      color: var(--white);
      margin-bottom: 12px;
    }

    .footer a {
      color: rgba(255,255,255,0.7);
      text-decoration: none;
    }

    .footer a:hover {
      color: var(--copper-gold);
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.2);
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }