/* roulang page: index */
:root {
      --primary: #E43D2A;
      --primary-dark: #C8321F;
      --primary-light: #FDE8E5;
      --secondary: #1A1A2E;
      --accent: #F5A623;
      --accent-light: #FFF3D6;
      --bg: #F9F9F9;
      --white: #FFFFFF;
      --text-main: #1A1A2E;
      --text-secondary: #5C5C6E;
      --text-muted: #8E8E9A;
      --border-light: #E8E8EC;
      --border-input: #E0E0E0;
      --shadow-card: 0 2px 16px rgba(0, 0, 0, 0.06);
      --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --max-width: 1280px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Inter", sans-serif;
    }

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

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

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: all 0.25s ease;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* 导航 */
    #nav {
      background: var(--white);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      position: sticky;
      top: 0;
      z-index: 50;
      padding: 12px 0;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 20px;
      color: var(--primary);
      letter-spacing: -0.02em;
    }

    .logo-icon {
      font-size: 26px;
      line-height: 1;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-weight: 500;
      color: var(--text-main);
    }

    .nav-links a {
      position: relative;
      font-size: 15px;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }

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

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

    .nav-right {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .search-box {
      display: flex;
      align-items: center;
      background: var(--white);
      border: 1px solid var(--border-input);
      border-radius: 30px;
      padding: 8px 14px;
      transition: border 0.2s;
    }

    .search-box i {
      color: var(--text-muted);
      font-size: 14px;
    }

    .search-box input {
      border: none;
      outline: none;
      background: transparent;
      margin-left: 6px;
      font-size: 14px;
      width: 120px;
      color: var(--text-main);
    }

    .search-box:focus-within {
      border-color: var(--primary);
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 6px 14px rgba(228, 61, 42, 0.3);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
    }

    .btn-outline:hover {
      background: var(--primary-light);
    }

    .btn-accent {
      background: var(--accent);
      color: #1A1A2E;
      font-weight: 700;
      padding: 16px 32px;
      border-radius: var(--radius-btn);
      font-size: 16px;
    }

    .btn-accent:hover {
      filter: brightness(1.1);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(245, 166, 35, 0.35);
    }

    .hamburger {
      display: none;
      font-size: 24px;
      color: var(--text-main);
    }

    /* Hero */
    #hero {
      background: linear-gradient(180deg, #F9F9F9 0%, #FFFFFF 100%);
      padding: 60px 0 80px;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-left {
      flex: 0 0 55%;
    }

    .hero-right {
      flex: 0 0 45%;
      position: relative;
    }

    .hero-right img {
      border-radius: 24px;
      box-shadow: var(--shadow-hover);
      position: relative;
      z-index: 2;
    }

    .decor-block {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 15px;
      left: 15px;
      background: rgba(228, 61, 42, 0.08);
      border-radius: 24px;
      z-index: 1;
      transform: rotate(2deg);
    }

    .hero-h1 {
      font-size: clamp(36px, 5vw, 54px);
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -0.02em;
      color: var(--secondary);
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .floating-icons {
      display: flex;
      gap: 14px;
      margin-top: 24px;
    }

    .float-icon {
      background: rgba(228, 61, 42, 0.12);
      color: var(--primary);
      padding: 10px;
      border-radius: 50%;
      font-size: 22px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 12px;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      display: block;
      width: 40px;
      height: 4px;
      background: var(--primary);
      margin-top: 8px;
      border-radius: 2px;
    }

    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }

    .highlight-item .big-num {
      font-size: 48px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
    }

    .highlight-item .label {
      color: var(--text-muted);
      font-size: 14px;
      margin-top: 8px;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: all 0.3s;
    }

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

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

    .service-body {
      padding: 24px;
    }

    .service-body h3 {
      font-size: 20px;
      font-weight: 600;
      margin: 12px 0 8px;
    }

    .service-body p {
      color: var(--text-secondary);
      font-size: 15px;
      margin-bottom: 16px;
    }

    .text-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 15px;
    }

    /* 案例瀑布流 */
    .cases-masonry {
      columns: 3;
      column-gap: 24px;
    }

    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      border-radius: var(--radius-card);
      overflow: hidden;
      position: relative;
    }

    .case-card img {
      width: 100%;
      display: block;
    }

    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(0,0,0,0.7));
      padding: 40px 20px 20px;
      color: white;
    }

    .case-overlay h3 {
      font-weight: 600;
    }

    /* 对比 */
    .compare-container {
      display: flex;
      align-items: center;
      gap: 30px;
    }

    .compare-col {
      flex: 1;
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
    }

    .compare-col.right {
      border: 2px solid var(--primary);
      background: #FFF9F8;
    }

    .vs-badge {
      background: var(--primary);
      color: white;
      border-radius: 50%;
      width: 60px;
      height: 60px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 20px;
    }

    .compare-list {
      list-style: none;
      margin-top: 20px;
    }

    .compare-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    /* FAQ */
    .faq-container {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
      padding-left: 12px;
      border-left: 4px solid var(--primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F5F5F7;
      border-radius: 6px;
      margin-top: 8px;
    }

    .faq-answer.open {
      max-height: 200px;
      padding: 16px;
    }

    /* CTA */
    #cta {
      background: var(--primary);
      text-align: center;
      padding: 80px 20px;
      color: white;
    }

    /* 联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .contact-form input, .contact-form textarea {
      width: 100%;
      padding: 14px;
      border: 1px solid var(--border-input);
      border-radius: var(--radius-input);
      background: #F5F5F7;
      margin-bottom: 16px;
      font-family: inherit;
    }

    .contact-form input:focus, .contact-form textarea:focus {
      border-color: var(--primary);
      outline: none;
      background: white;
    }

    /* 页脚 */
    #footer {
      background: var(--secondary);
      color: #ddd;
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; }
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .cases-masonry { columns: 2; }
    }

    @media (max-width: 768px) {
      .nav-links, .nav-right .search-box { display: none; }
      .hamburger { display: block; }
      .highlights-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: 1fr; }
      .cases-masonry { columns: 1; }
      .compare-container { flex-direction: column; }
      .contact-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-h1 { font-size: 32px; }
    }