/* roulang page: index */
/* 基础重置与设计变量 */
    :root {
      --primary: #0A0E27;
      --accent: #D4AF37;
      --highlight: #FF3C38;
      --bg: #F5F3EF;
      --card-bg: #FFFFFF;
      --text: #1A1A1A;
      --muted: #5A5A5A;
      --border-light: #E5E5E5;
      --white: #FFFFFF;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --transition: 0.3s ease;
      --container-width: 1280px;
      --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-number: "Inter", "Noto Sans SC", sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      font-weight: 400;
      font-size: 16px;
      line-height: 1.75;
      color: var(--text);
      background-color: var(--bg);
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, input, textarea {
      font-family: inherit;
      font-size: inherit;
      border: none;
      outline: none;
      background: transparent;
    }

    .container {
      max-width: var(--container-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 排版 */
    h1 {
      font-weight: 800;
      font-size: 3.5rem;
      letter-spacing: -0.02em;
      line-height: 1.2;
      color: var(--white);
    }

    h2 {
      font-weight: 700;
      font-size: 2.25rem;
      letter-spacing: -0.01em;
      line-height: 1.3;
      color: var(--primary);
    }

    h3 {
      font-weight: 600;
      font-size: 1.25rem;
      line-height: 1.4;
      color: var(--primary);
    }

    .text-muted {
      color: var(--muted);
    }

    .text-gold {
      color: var(--accent);
    }

    .text-highlight {
      color: var(--highlight);
    }

    /* 按钮 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      transition: all var(--transition);
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--highlight);
      color: var(--white);
      box-shadow: 0 4px 12px rgba(255,60,56,0.3);
    }

    .btn-primary:hover {
      background: #CC2F2B;
      box-shadow: 0 8px 20px rgba(255,60,56,0.4);
      transform: translateY(-2px);
    }

    .btn-outline {
      border: 2px solid rgba(255,255,255,0.8);
      color: var(--white);
      background: transparent;
    }

    .btn-outline:hover {
      background: var(--white);
      color: var(--primary);
      border-color: var(--white);
      transform: translateY(-2px);
    }

    .btn-gold {
      background: var(--accent);
      color: var(--primary);
      font-weight: 700;
      box-shadow: 0 4px 12px rgba(212,175,55,0.4);
    }

    .btn-gold:hover {
      background: #c09e2e;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(212,175,55,0.5);
    }

    .btn-link {
      color: var(--accent);
      font-weight: 600;
      padding: 0;
      background: none;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: gap 0.2s ease;
    }

    .btn-link:hover {
      gap: 10px;
      color: #b38b2a;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--primary);
    }

    .logo-img {
      height: 36px;
      width: auto;
    }

    .logo-text {
      display: flex;
      align-items: baseline;
    }

    .logo-highlight {
      color: var(--accent);
      margin-left: 4px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-link {
      font-weight: 500;
      color: var(--text);
      position: relative;
      padding: 8px 0;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: all 0.3s ease;
      transform: translateX(-50%);
    }

    .nav-link:hover {
      color: var(--accent);
    }

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

    .search-box {
      display: flex;
      align-items: center;
      background: var(--bg);
      border-radius: 20px;
      padding: 8px 16px;
      margin-right: 12px;
    }

    .search-box i {
      color: var(--muted);
      font-size: 0.9rem;
    }

    .search-box input {
      margin-left: 8px;
      background: transparent;
      width: 120px;
      font-size: 0.9rem;
      color: var(--text);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .menu-toggle {
      display: none;
      background: none;
      font-size: 1.5rem;
      color: var(--primary);
      cursor: pointer;
    }

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

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

    .section-title {
      text-align: center;
      margin-bottom: 16px;
    }

    .section-subtitle {
      text-align: center;
      color: var(--muted);
      max-width: 600px;
      margin: 0 auto 60px;
      font-size: 1.1rem;
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      margin-top: 72px;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(10,14,39,0.9) 0%, rgba(10,14,39,0.65) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      padding: 0 20px;
    }

    .hero h1 {
      margin-bottom: 24px;
    }

    .hero p {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 40px;
    }

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

    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: var(--accent);
      font-size: 2rem;
      animation: bounce 2s infinite;
      z-index: 2;
    }

    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
      40% { transform: translateX(-50%) translateY(-15px); }
      60% { transform: translateX(-50%) translateY(-8px); }
    }

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }

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

    .service-icon {
      width: 64px;
      height: 64px;
      margin-bottom: 24px;
      border-radius: 12px;
      background: rgba(212,175,55,0.08);
      display: flex;
      align-items: center;
      justify-content: center;
      transition: background 0.3s;
    }

    .card:hover .service-icon {
      background: rgba(212,175,55,0.18);
    }

    .service-icon img {
      width: 36px;
      height: 36px;
    }

    /* 优势数据 */
    .advantages-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .adv-left {
      flex: 1;
    }

    .adv-right {
      flex: 1;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .stat-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--accent);
      display: block;
    }

    .stat-label {
      color: var(--muted);
      font-size: 0.95rem;
      margin-top: 8px;
    }

    /* 案例卡片 */
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }

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

    .case-img {
      height: 220px;
      object-fit: cover;
    }

    .case-body {
      padding: 24px;
    }

    .case-tag {
      display: inline-block;
      background: var(--primary);
      color: var(--white);
      font-size: 0.75rem;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 12px;
    }

    .case-result {
      color: var(--highlight);
      font-weight: 700;
      font-size: 1.1rem;
      margin: 8px 0;
    }

    /* 解决方案交替 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }

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

    .solution-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      height: 360px;
    }

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

    .solution-text {
      flex: 1;
    }

    .solution-list {
      list-style: none;
      margin: 20px 0;
    }

    .solution-list li {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      margin-bottom: 12px;
    }

    .solution-list li::before {
      content: '';
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--accent);
      margin-top: 8px;
      flex-shrink: 0;
    }

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

    .faq-item {
      background: var(--card-bg);
      border-bottom: 1px solid var(--border-light);
      transition: background 0.2s;
    }

    .faq-item:hover {
      background: #FAFAFA;
    }

    .faq-question {
      width: 100%;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 24px 20px;
      font-weight: 600;
      font-size: 1.25rem;
      color: var(--primary);
      cursor: pointer;
      background: transparent;
    }

    .faq-question i {
      color: var(--accent);
      transition: transform 0.3s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      background: var(--bg);
      padding: 0 20px;
      color: var(--muted);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 20px;
    }

    .faq-item.active .faq-question i {
      transform: rotate(45deg);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary);
      padding: 80px 20px;
      text-align: center;
      border-radius: var(--radius-lg);
      margin: 0 20px;
    }

    .cta-banner h2 {
      color: var(--white);
      margin-bottom: 16px;
    }

    .cta-banner p {
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
    }

    /* 页脚 */
    .footer {
      background: var(--primary);
      color: #B0B0B0;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: flex;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-form {
      flex: 1.5;
    }

    .footer-info {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-input {
      width: 100%;
      padding: 14px 16px;
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: var(--radius-sm);
      color: var(--white);
      transition: border 0.3s;
    }

    .form-input:focus {
      border-color: var(--accent);
      outline: none;
    }

    textarea.form-input {
      resize: vertical;
      min-height: 100px;
    }

    .contact-item {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .contact-item i {
      color: var(--accent);
      width: 20px;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.15);
      padding-top: 20px;
      text-align: center;
      font-size: 0.9rem;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .advantages-grid { flex-direction: column; }
    }

    @media (max-width: 768px) {
      h1 { font-size: 2.2rem; }
      h2 { font-size: 1.75rem; }
      .section { padding: 60px 0; }
      .grid-3, .grid-2 { grid-template-columns: 1fr; }
      .nav-menu, .header-actions .search-box, .header-actions .btn { display: none; }
      .menu-toggle { display: block; }
      .mobile-menu.active { display: flex; flex-direction: column; position: absolute; top: 72px; left: 0; width: 100%; background: white; padding: 20px; box-shadow: 0 10px 20px rgba(0,0,0,0.1); }
      .solution-row, .solution-row.reverse { flex-direction: column; }
      .footer-grid { flex-direction: column; }
      .hero { min-height: 80vh; }
    }

    @media (max-width: 520px) {
      .hero-buttons { flex-direction: column; width: 100%; }
      .btn { width: 100%; }
    }