/* roulang page: index */
:root {
      --primary: #0A4B3A;
      --primary-light: #0e5d48;
      --accent: #F5A623;
      --accent-hover: #F7B84C;
      --bg: #F7F9FC;
      --card-bg: #FFFFFF;
      --text: #1A1A1A;
      --text-secondary: #4A4A4A;
      --border: #D0D7DE;
      --shadow-sm: 0 2px 12px rgba(10,75,58,0.08);
      --shadow-hover: 0 4px 20px rgba(10,75,58,0.15);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --spacing-section: 80px;
      --spacing-mobile: 48px;
      --nav-width: 220px;
      --font-h1: 32px;
      --font-h2: 26px;
      --font-h3: 20px;
      --font-body: 16px;
      --font-small: 14px;
      font-family: "PingFang SC","Microsoft YaHei","Helvetica Neue",sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      background-color: var(--bg);
      color: var(--text);
      font-size: var(--font-body);
      line-height: 1.6;
      font-weight: 400;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

    button, input, textarea {
      font-family: inherit;
      outline: none;
    }

    h1, h2, h3 {
      margin: 0 0 0.5rem;
      font-weight: 600;
    }

    h1 { font-size: var(--font-h1); line-height: 1.2; font-weight: 700; }
    h2 { font-size: var(--font-h2); line-height: 1.3; }
    h3 { font-size: var(--font-h3); line-height: 1.4; }

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

    /* 左侧导航桌面版 */
    .side-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: var(--nav-width);
      height: 100vh;
      background-color: var(--primary);
      color: white;
      display: flex;
      flex-direction: column;
      z-index: 100;
      box-shadow: 2px 0 15px rgba(0,0,0,0.08);
      transition: transform 0.3s ease;
    }

    .nav-brand {
      padding: 28px 20px 20px;
      font-size: 20px;
      font-weight: 700;
      letter-spacing: 0.5px;
      border-bottom: 1px solid rgba(255,255,255,0.15);
      margin-bottom: 24px;
    }

    .nav-links {
      list-style: none;
      margin: 0;
      padding: 0 16px;
      flex: 1;
    }

    .nav-links li {
      margin-bottom: 8px;
    }

    .nav-links a {
      display: block;
      padding: 12px 16px;
      border-radius: 8px;
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 15px;
      transition: all 0.2s ease;
      border-left: 3px solid transparent;
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      background-color: rgba(255,255,255,0.08);
      color: white;
      border-left-color: var(--accent);
      padding-left: 20px;
    }

    .nav-footer {
      padding: 20px 24px;
      font-size: 13px;
      color: rgba(255,255,255,0.6);
      border-top: 1px solid rgba(255,255,255,0.1);
    }

    /* 主内容区域 */
    .main-content {
      margin-left: var(--nav-width);
      flex: 1;
      background-color: var(--bg);
    }

    /* 移动端顶部导航 */
    .mobile-header {
      display: none;
      background: var(--primary);
      color: white;
      height: 56px;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 99;
      box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    }

    .mobile-logo {
      font-weight: 700;
      font-size: 18px;
    }

    .hamburger {
      background: none;
      border: none;
      color: white;
      font-size: 24px;
      cursor: pointer;
    }

    .mobile-nav-panel {
      display: none;
      position: fixed;
      top: 56px;
      left: 0;
      right: 0;
      background: var(--primary);
      flex-direction: column;
      padding: 16px;
      z-index: 98;
      box-shadow: 0 10px 20px rgba(0,0,0,0.2);
    }

    .mobile-nav-panel a {
      color: white;
      padding: 12px 16px;
      border-radius: 6px;
      margin-bottom: 4px;
      display: block;
      font-weight: 500;
    }

    .mobile-nav-panel a:hover {
      background: rgba(255,255,255,0.1);
    }

    /* Hero */
    #hero {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      position: relative;
      color: white;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(10,75,58,0.7);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      padding: 0 20px;
    }

    .hero-content h1 {
      font-size: 2.8rem;
      margin-bottom: 1rem;
      line-height: 1.2;
    }

    .hero-sub {
      font-size: 1.2rem;
      margin-bottom: 2rem;
      opacity: 0.9;
    }

    .btn-cta {
      background: var(--accent);
      color: #1A1A1A;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      font-size: 16px;
      cursor: pointer;
      transition: all 0.25s;
      display: inline-block;
      box-shadow: 0 4px 10px rgba(245,166,35,0.3);
    }

    .btn-cta:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(245,166,35,0.4);
    }

    /* 通用区块 */
    section {
      padding: var(--spacing-section) 0;
    }

    .section-title {
      margin-bottom: 2.5rem;
      color: var(--primary);
    }

    /* 指标卡片 */
    .stat-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }

    .stat-card {
      background: var(--card-bg);
      padding: 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--accent);
      transition: all 0.2s;
    }

    .stat-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }

    .stat-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }

    .stat-label {
      font-size: var(--font-small);
      color: var(--text-secondary);
      margin-top: 8px;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      transition: all 0.2s;
      border: 1px solid transparent;
    }

    .service-card:hover {
      border-color: var(--accent);
      box-shadow: var(--shadow-hover);
    }

    .service-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }

    .service-text {
      padding: 20px;
    }

    .service-text h3 {
      margin-bottom: 0.5rem;
    }

    /* 对比区 */
    .comparison-wrapper {
      display: flex;
      background: #F0F3F6;
      border-radius: var(--radius-card);
      overflow: hidden;
    }

    .compare-col {
      flex: 1;
      padding: 32px;
    }

    .compare-divider {
      width: 2px;
      background: white;
      margin: 20px 0;
    }

    .compare-item {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }

    .compare-value {
      font-weight: 700;
      color: var(--primary);
    }

    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid #e0e5ea;
      padding: 16px 0;
    }

    .accordion-question {
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--primary);
      transition: 0.2s;
    }

    .accordion-question:hover {
      color: var(--accent);
    }

    .accordion-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }

    .accordion-answer.open {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA 表单 */
    .cta-block {
      background: #EDF1F5;
      border-radius: var(--radius-card);
      padding: 48px 32px;
    }

    .form-row {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .form-input {
      flex: 1;
      padding: 14px 16px;
      border: 1px solid var(--border);
      border-radius: var(--radius-input);
      background: white;
      font-size: 16px;
    }

    .form-input:focus {
      border-color: var(--primary);
    }

    .btn-submit {
      background: var(--accent);
      color: #1A1A1A;
      font-weight: 600;
      padding: 14px 28px;
      border: none;
      border-radius: var(--radius-btn);
      cursor: pointer;
      transition: 0.2s;
    }

    .btn-submit:hover {
      background: var(--accent-hover);
    }

    /* 页脚 */
    footer {
      background: var(--primary);
      color: white;
      padding: 48px 0 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 32px;
    }

    .footer-links a {
      display: block;
      color: rgba(255,255,255,0.7);
      margin-bottom: 8px;
      transition: 0.2s;
    }

    .footer-links a:hover {
      color: var(--accent);
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.2);
      padding-top: 20px;
      font-size: 14px;
      color: rgba(255,255,255,0.7);
    }

    @media (max-width: 1024px) {
      .stat-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .side-nav { display: none; }
      .mobile-header { display: flex; }
      .mobile-nav-panel.active { display: flex; }
      .main-content { margin-left: 0; padding-top: 56px; }
      #hero { min-height: 70vh; }
      .hero-content h1 { font-size: 2rem; }
      section { padding: var(--spacing-mobile) 0; }
      .stat-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .comparison-wrapper { flex-direction: column; }
      .compare-divider { display: none; }
      .form-row { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }