/* roulang page: index */
:root {
      --primary-deep: #0B2B26;
      --primary-soft: #1B4D42;
      --accent-orange: #E85D04;
      --accent-orange-hover: #C94A03;
      --bg-warm: #FAFAF8;
      --card-bg: #FFFFFF;
      --border-light: #E6E6E0;
      --text-main: #1E1E1E;
      --text-muted: #5A5A5A;
      --text-on-dark: #FFFFFF;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-md: 0 10px 25px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-title: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-number: "DIN Alternate", "Oswald", "Arial Narrow", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --max-width: 1280px;
      --nav-height: 72px;
      --bottom-nav-height: 64px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input, textarea {
      font-family: inherit;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航系统 */
    .desktop-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: transparent;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      z-index: 1000;
      transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
    }

    .desktop-nav.scrolled {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.05);
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: -0.02em;
      color: var(--text-on-dark);
      transition: color 0.3s;
    }
    .desktop-nav.scrolled .logo-area {
      color: var(--primary-deep);
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--accent-orange);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: white;
      font-size: 18px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-weight: 500;
      font-size: 1rem;
      color: rgba(255,255,255,0.9);
      transition: color 0.3s;
    }
    .desktop-nav.scrolled .nav-links {
      color: var(--text-main);
    }
    .nav-links a {
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--accent-orange);
    }

    .btn-primary {
      background: var(--accent-orange);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: background 0.25s ease, transform 0.2s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--accent-orange-hover);
      transform: scale(1.03);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary-deep);
      border: 2px solid var(--primary-deep);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.25s ease;
    }
    .btn-outline:hover {
      background: var(--primary-deep);
      color: white;
    }
    .desktop-nav .btn-outline {
      color: white;
      border-color: white;
    }
    .desktop-nav.scrolled .btn-outline {
      color: var(--primary-deep);
      border-color: var(--primary-deep);
    }
    .desktop-nav.scrolled .btn-outline:hover {
      background: var(--primary-deep);
      color: white;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: var(--bottom-nav-height);
      background: white;
      border-radius: 20px 20px 0 0;
      box-shadow: 0 -4px 12px rgba(0,0,0,0.06);
      z-index: 1000;
      justify-content: space-around;
      align-items: center;
      padding: 0 16px;
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      color: var(--text-muted);
      transition: color 0.2s;
      font-weight: 500;
      gap: 4px;
    }
    .mobile-nav-item.active {
      color: var(--primary-deep);
      font-weight: 700;
    }
    .mobile-nav-icon {
      font-size: 20px;
    }

    /* Hero 区块 */
    .hero {
      min-height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      color: white;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(11,43,38,0.85) 0%, rgba(27,77,66,0.5) 70%, rgba(250,250,248,0.1) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      width: 100%;
      padding: 0 24px;
      display: flex;
      flex-direction: column;
      gap: 32px;
      max-width: var(--max-width);
      margin: 0 auto;
      padding-top: 80px;
    }
    .hero h1 {
      font-family: var(--font-title);
      font-size: clamp(2.5rem, 6vw, 4rem);
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.2;
      max-width: 700px;
    }
    .hero-sub {
      font-size: 1.2rem;
      opacity: 0.9;
      max-width: 500px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-stats {
      display: flex;
      gap: 40px;
      margin-top: 1rem;
    }
    .stat-item {
      display: flex;
      flex-direction: column;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-orange);
      line-height: 1.1;
    }
    .stat-label {
      font-size: 0.9rem;
      opacity: 0.8;
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-family: var(--font-title);
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 16px;
      letter-spacing: -0.02em;
    }
    .section-sub {
      color: var(--text-muted);
      max-width: 600px;
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    /* 数据看板 */
    .data-board {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 32px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: -60px;
      position: relative;
      z-index: 5;
      background: white;
    }
    .data-card {
      text-align: center;
    }
    .data-big {
      font-family: var(--font-number);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary-deep);
    }
    .data-trend {
      font-size: 0.9rem;
      color: #2E7D32;
    }

    /* 服务矩阵 非对称 */
    .service-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      border: 1px solid var(--border-light);
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .service-card.large {
      grid-row: span 2;
      display: flex;
      flex-direction: column;
    }
    .service-img {
      width: 100%;
      height: 160px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 1.4rem;
      margin-bottom: 8px;
    }
    .service-link {
      color: var(--primary-deep);
      font-weight: 600;
      margin-top: 12px;
      display: inline-block;
    }

    /* 对比区 */
    .compare-wrapper {
      display: flex;
      gap: 0;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .compare-col {
      flex: 1;
      padding: 40px;
    }
    .compare-col.left {
      background: #f0f0ec;
      color: #5a5a5a;
    }
    .compare-col.right {
      background: var(--primary-deep);
      color: white;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 16px 0;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      border-left: 4px solid transparent;
      transition: 0.2s;
      box-shadow: var(--shadow-sm);
    }
    .faq-item[open] {
      border-left-color: var(--primary-deep);
    }
    .faq-question {
      padding: 20px;
      font-weight: 600;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      padding: 0 20px 20px;
      color: var(--text-muted);
    }

    /* 表单 */
    .contact-form {
      background: white;
      padding: 40px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }
    .input-line {
      width: 100%;
      padding: 14px 0;
      border: none;
      border-bottom: 2px solid var(--primary-deep);
      background: transparent;
      margin-bottom: 24px;
      outline: none;
    }
    .input-line:focus {
      border-bottom-color: var(--accent-orange);
    }

    footer {
      background: var(--primary-deep);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .service-grid {
        grid-template-columns: 1fr 1fr;
      }
      .data-board {
        grid-template-columns: repeat(2,1fr);
      }
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      .hero {
        min-height: 90vh;
      }
      .service-grid {
        grid-template-columns: 1fr;
      }
      .compare-wrapper {
        flex-direction: column;
      }
      .data-board {
        grid-template-columns: 1fr;
        margin-top: 20px;
      }
      section {
        padding: 60px 0;
      }
      body {
        padding-bottom: 80px;
      }
    }