/* roulang page: index */
/* ----- 设计变量与基础重置 ----- */
    :root {
      --deep-blue: #0B1A2F;
      --copper-gold: #C9A96E;
      --data-cyan: #2EC4B6;
      --text-primary: #E8EDF2;
      --text-secondary: #9BA9BB;
      --card-bg: #132236;
      --border-copper-dim: rgba(201, 169, 110, 0.12);
      --border-copper-glow: rgba(201, 169, 110, 0.8);
      --bg-strip: #0F1F33;
      --footer-text: #5A6B7F;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-pill: 40px;
      --shadow-glow: 0 0 18px rgba(201,169,110,0.3);
      --transition-smooth: 0.25s ease;
      --font-mono: 'SF Mono', 'Fira Code', 'Courier New', monospace;
    }

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

    body {
      font-family: system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--deep-blue);
      color: var(--text-primary);
      line-height: 1.75;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
      overflow-x: hidden;
    }

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

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

    button, .button {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }

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

    /* 容器与通用布局 */
    .custom-container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
      width: 100%;
    }

    section {
      padding: 140px 0;
      position: relative;
    }

    @media (max-width: 768px) {
      section {
        padding: 90px 0;
      }
    }

    /* 标题装饰竖线 */
    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      margin-bottom: 2.5rem;
      display: flex;
      align-items: center;
      gap: 1.2rem;
      color: var(--text-primary);
    }
    .section-title::before {
      content: '';
      display: inline-block;
      width: 4px;
      height: 2.2rem;
      background: var(--copper-gold);
      border-radius: 2px;
    }

    @media (max-width: 768px) {
      .section-title {
        font-size: 1.8rem;
      }
    }

    /* ----- 浮动导航 Dock ----- */
    .nav-dock {
      position: fixed;
      top: 24px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 40px);
      max-width: 720px;
      background: rgba(11, 26, 47, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-pill);
      padding: 12px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      z-index: 999;
      border: 1px solid rgba(201, 169, 110, 0.18);
      box-shadow: 0 8px 20px rgba(0,0,0,0.3);
    }

    .logo-text {
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--copper-gold);
      letter-spacing: -0.3px;
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
    }

    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 1rem;
      transition: color 0.2s;
    }

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

    .nav-cta {
      background: var(--copper-gold);
      color: var(--deep-blue);
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.95rem;
      transition: background 0.25s, box-shadow 0.25s;
      white-space: nowrap;
    }

    .nav-cta:hover {
      background: #D4B87A;
      box-shadow: var(--shadow-glow);
      color: var(--deep-blue);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 22px;
      height: 2px;
      background: var(--copper-gold);
      border-radius: 2px;
      transition: 0.2s;
    }

    @media (max-width: 768px) {
      .nav-links, .nav-cta.desktop-only {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 90px;
      left: 20px;
      right: 20px;
      background: rgba(11, 26, 47, 0.95);
      backdrop-filter: blur(20px);
      border-radius: 28px;
      padding: 24px;
      flex-direction: column;
      align-items: center;
      gap: 20px;
      z-index: 1000;
      border: 1px solid var(--copper-gold);
    }
    .mobile-menu a {
      color: var(--text-primary);
      font-size: 1.2rem;
    }
    .mobile-menu .nav-cta-mobile {
      background: var(--copper-gold);
      color: var(--deep-blue);
      padding: 12px 28px;
      border-radius: 30px;
    }

    /* ----- Hero 首屏 ----- */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-left {
      flex: 1 1 50%;
    }
    .hero-right {
      flex: 1 1 50%;
      position: relative;
    }
    .hero-label {
      color: var(--copper-gold);
      font-size: 0.9rem;
      letter-spacing: 1px;
      margin-bottom: 1rem;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .hero-label::after {
      content: '';
      height: 1px;
      width: 40px;
      background: var(--copper-gold);
    }
    h1 {
      font-size: 3.8rem;
      font-weight: 700;
      line-height: 1.15;
      letter-spacing: -0.02em;
      margin-bottom: 1.5rem;
      color: var(--text-primary);
    }
    h1 .highlight {
      color: var(--copper-gold);
    }
    .hero-sub {
      font-size: 1.1rem;
      color: var(--text-secondary);
      max-width: 480px;
      margin-bottom: 2.2rem;
    }
    .button-group {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--copper-gold);
      color: var(--deep-blue);
      padding: 14px 36px;
      border-radius: 30px;
      font-weight: 600;
      transition: 0.25s;
      display: inline-block;
    }
    .btn-primary:hover {
      background: #D4B87A;
      box-shadow: var(--shadow-glow);
      color: var(--deep-blue);
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--copper-gold);
      color: var(--copper-gold);
      padding: 14px 36px;
      border-radius: 30px;
      font-weight: 600;
      transition: 0.25s;
    }
    .btn-secondary:hover {
      background: rgba(201,169,110,0.08);
    }
    .hero-visual {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      height: 420px;
      width: 100%;
      position: relative;
      overflow: hidden;
      border: 1px solid rgba(201,169,110,0.2);
    }
    .hero-visual::after {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 30%, rgba(11,26,47,0.4) 0%, rgba(11,26,47,0.9) 90%);
    }
    .floating-dots {
      position: absolute;
      width: 6px;
      height: 6px;
      background: var(--copper-gold);
      border-radius: 50%;
      opacity: 0.5;
      animation: float 5s infinite alternate;
    }
    @keyframes float {
      0% { transform: translateY(0px); }
      100% { transform: translateY(-18px); }
    }

    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      h1 {
        font-size: 2.8rem;
      }
      .hero-visual {
        height: 280px;
      }
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--border-copper-dim);
      border-radius: var(--radius-md);
      padding: 36px;
      transition: all var(--transition-smooth);
    }
    .service-card:hover {
      border-color: var(--border-copper-glow);
      transform: translateY(-4px);
    }
    .service-icon {
      font-size: 2rem;
      color: var(--copper-gold);
      margin-bottom: 1.5rem;
    }
    .service-card h3 {
      font-size: 1.4rem;
      font-weight: 600;
      margin-bottom: 0.8rem;
    }
    .service-desc {
      color: var(--text-secondary);
      margin-bottom: 1.5rem;
    }
    .text-link {
      color: var(--copper-gold);
      font-weight: 500;
      transition: 0.2s;
    }
    .text-link:hover {
      color: var(--data-cyan);
    }

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

    /* 量化优势 */
    .advantages-bg {
      background: var(--bg-strip);
      border-radius: 0;
    }
    .stats-grid {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 2rem;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--copper-gold);
      font-feature-settings: "tnum";
    }
    .stat-label {
      color: var(--text-secondary);
      margin-top: 0.5rem;
    }
    .adv-image {
      max-width: 280px;
      opacity: 0.8;
    }

    /* 案例卡片 */
    .case-row {
      display: flex;
      gap: 48px;
      margin-bottom: 3rem;
      align-items: center;
    }
    .case-img {
      flex: 0 0 45%;
      border-radius: var(--radius-sm);
      overflow: hidden;
      border: 1px solid var(--copper-gold);
    }
    .case-content {
      flex: 1;
    }
    .case-tag {
      color: var(--copper-gold);
      font-size: 0.8rem;
      letter-spacing: 1px;
    }
    @media (max-width: 768px) {
      .case-row {
        flex-direction: column;
      }
      .case-img {
        flex: auto;
      }
    }

    /* 流程 */
    .process-flex {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      text-align: center;
      position: relative;
    }
    .step-item {
      flex: 1;
      position: relative;
    }
    .step-circle {
      width: 48px;
      height: 48px;
      border: 2px solid var(--copper-gold);
      border-radius: 50%;
      color: var(--copper-gold);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1rem;
      background: var(--deep-blue);
    }
    .step-connector {
      position: absolute;
      top: 24px;
      left: 70%;
      width: 60%;
      height: 1px;
      background: rgba(201,169,110,0.3);
    }
    @media (max-width: 768px) {
      .process-flex {
        flex-direction: column;
        gap: 2rem;
      }
      .step-connector {
        display: none;
      }
    }

    /* FAQ 手风琴定制 */
    .accordion-item {
      background: var(--card-bg);
      border: 1px solid var(--border-copper-dim);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
    }
    .accordion-title {
      background: transparent;
      color: var(--text-primary);
      padding: 18px 24px;
      font-weight: 500;
      border: none;
      width: 100%;
      text-align: left;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-content {
      padding: 0 24px 18px;
      color: var(--text-secondary);
    }

    /* 联系表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
    }
    .input-field {
      background: var(--card-bg);
      border: 1px solid var(--copper-gold);
      border-radius: 30px;
      padding: 14px 20px;
      color: white;
      width: 100%;
      margin-bottom: 1rem;
    }
    .input-field:focus {
      border-color: var(--data-cyan);
    }
    .social-icons i {
      font-size: 1.5rem;
      margin-right: 18px;
      color: var(--copper-gold);
      transition: 0.2s;
    }
    .social-icons i:hover {
      color: var(--data-cyan);
    }
    footer {
      border-top: 1px solid rgba(201,169,110,0.2);
      padding: 28px 0;
      color: var(--footer-text);
      text-align: center;
    }