/* roulang page: index */
:root {
      --primary: #F15A24;
      --primary-deep: #D84315;
      --secondary: #2E7D32;
      --secondary-light: #E8F5E9;
      --accent-gold: #F9A825;
      --bg-warm: #FAF8F5;
      --bg-hero-end: #FFF3E0;
      --card-bg: #FFFFFF;
      --text-dark: #1E1E1E;
      --text-mid: #5F5F5F;
      --text-light: #8A8A8A;
      --border-light: #E0E0E0;
      --shadow-sm: 0 8px 30px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 16px 40px rgba(0, 0, 0, 0.08);
      --radius-card: 20px;
      --radius-mid: 14px;
      --radius-btn: 30px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.2px;
      margin: 0 0 0.75rem;
    }

    h1 {
      font-size: 44px;
      line-height: 1.25;
      color: #1E1E1E;
    }

    h2 {
      font-size: 32px;
      line-height: 1.35;
      color: #1E1E1E;
      margin-bottom: 1rem;
    }

    h3 {
      font-size: 20px;
      line-height: 1.4;
      color: #1E1E1E;
      font-weight: 600;
    }

    p, span, li {
      font-size: 16px;
      color: var(--text-mid);
      line-height: 1.7;
      max-width: 680px;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    /* 导航 */
    .nav-bar {
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-light);
      height: 72px;
      display: flex;
      align-items: center;
      position: sticky;
      top: 0;
      z-index: 100;
      padding: 0 2rem;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent-gold) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 0.4rem;
      letter-spacing: -0.3px;
    }

    .logo i {
      background: none;
      -webkit-text-fill-color: var(--primary);
      font-size: 1.9rem;
      background: linear-gradient(180deg, var(--primary) 20%, var(--accent-gold) 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      align-items: center;
    }

    .nav-links a {
      color: var(--text-mid);
      font-weight: 500;
      font-size: 1rem;
      text-decoration: none;
      transition: color 0.2s ease;
      position: relative;
      padding-bottom: 0.25rem;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 4px;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-dark);
      border-radius: 2px;
    }

    @media (max-width: 840px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 2rem;
        gap: 1.2rem;
        box-shadow: 0 20px 30px rgba(0,0,0,0.05);
      }
      .nav-links.open {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, var(--bg-warm) 0%, var(--bg-hero-end) 100%);
      padding: 4rem 0 5rem;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }

    .hero-left {
      flex: 1;
    }

    .hero-right {
      flex: 1;
      position: relative;
    }

    .hero-right img {
      width: 100%;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      object-fit: cover;
    }

    .badge-float {
      position: absolute;
      bottom: -20px;
      right: -15px;
      background: linear-gradient(135deg, var(--accent-gold) 0%, #FFB300 100%);
      color: #1E1E1E;
      padding: 0.7rem 1.8rem;
      border-radius: 30px;
      font-weight: 700;
      font-size: 1.1rem;
      box-shadow: 0 12px 24px rgba(249,168,37,0.3);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent-gold) 100%);
      border: none;
      color: white;
      padding: 0.9rem 2.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: all 0.2s ease;
      text-decoration: none;
      display: inline-block;
      box-shadow: 0 8px 18px rgba(241,90,36,0.25);
      cursor: pointer;
    }

    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 12px 24px rgba(241,90,36,0.35);
      color: white;
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 0.7rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
      text-decoration: none;
    }

    .btn-outline:hover {
      background: rgba(241,90,36,0.05);
      border-color: var(--primary-deep);
    }

    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      h1 {
        font-size: 32px;
      }
    }

    /* 数据看板 */
    .data-board {
      padding: 80px 0;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.8rem;
    }

    .stat-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
      text-align: center;
    }

    .stat-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .stat-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--accent-gold);
      margin-bottom: 0.3rem;
    }

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

    /* 服务矩阵 */
    .service-matrix {
      padding: 80px 0;
    }

    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .service-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.2s;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .service-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }

    .service-content {
      padding: 1.5rem;
    }

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

    /* 对比区 */
    .compare {
      padding: 80px 0;
    }

    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2.5rem;
    }

    .compare-box {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
    }

    .compare-box ul {
      list-style: none;
      padding-left: 0;
    }

    .compare-box li {
      margin: 1rem 0;
      display: flex;
      align-items: center;
      gap: 0.7rem;
    }

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

    /* FAQ */
    .faq {
      padding: 80px 0;
    }

    .accordion-item {
      background: white;
      border-radius: var(--radius-mid);
      margin-bottom: 1rem;
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
    }

    .accordion-title {
      background: white;
      padding: 1.2rem 1.8rem;
      font-weight: 600;
      border-left: 4px solid var(--primary);
      cursor: pointer;
      transition: 0.2s;
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: #fefefe;
      padding: 0 1.8rem;
    }

    .accordion-content.open {
      max-height: 200px;
      padding: 1rem 1.8rem;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(120deg, var(--secondary-light) 0%, rgba(255,243,224,0.8) 100%);
      padding: 4rem 0;
      border-radius: 30px;
      margin: 40px 0;
    }

    .form-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2.5rem;
      box-shadow: var(--shadow-sm);
    }

    input, textarea {
      border-radius: 12px !important;
      border: 1px solid #ddd;
      padding: 0.8rem;
      width: 100%;
    }

    /* 页脚 */
    .footer {
      background: #1E1E1E;
      color: #ccc;
      padding: 3rem 2rem 1.5rem;
    }

    .footer a {
      color: #aaa;
      text-decoration: none;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }

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