/* roulang page: index */
:root {
      --primary-deep: #1A1A1A;
      --accent-gold: #C9A84C;
      --bg-white: #FAFAFA;
      --text-body: #555555;
      --text-light: #E0E0E0;
      --white: #FFFFFF;
      --border-light: rgba(0,0,0,0.08);
      --border-dark: rgba(255,255,255,0.12);
      --shadow-hard: 4px 4px 0px rgba(0,0,0,0.1);
      --radius-card: 8px;
      --radius-btn: 4px;
      --font-heading: 'Inter', 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
      --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
      font-family: var(--font-body);
      color: var(--text-body);
      background-color: var(--bg-white);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(26, 26, 26, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      transition: var(--transition-smooth);
      padding: 0.8rem 0;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    .logo {
      font-family: var(--font-heading);
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: -0.02em;
      color: var(--white);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 0.3rem;
    }
    .logo i {
      color: var(--accent-gold);
      font-size: 2rem;
      transition: transform 0.2s;
    }
    .logo:hover i {
      transform: scale(1.1);
    }

    .desktop-nav {
      display: flex;
      gap: 2.2rem;
      align-items: center;
    }
    .desktop-nav a {
      color: var(--text-light);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      letter-spacing: 0.3px;
      transition: var(--transition-smooth);
      position: relative;
    }
    .desktop-nav a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.25s ease;
    }
    .desktop-nav a:hover {
      color: var(--white);
    }
    .desktop-nav a:hover::after {
      width: 100%;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--white);
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* 移动端底部胶囊导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 1.2rem;
      left: 50%;
      transform: translateX(-50%);
      background: rgba(26,26,26,0.9);
      backdrop-filter: blur(20px);
      border: 1px solid var(--accent-gold);
      border-radius: 40px;
      padding: 0.5rem 1.2rem;
      z-index: 110;
      box-shadow: 0 8px 20px rgba(0,0,0,0.3);
    }
    .mobile-bottom-nav .nav-icons {
      display: flex;
      gap: 1.5rem;
      align-items: center;
    }
    .mobile-bottom-nav a {
      color: #cccccc;
      font-size: 1.4rem;
      transition: var(--transition-smooth);
      display: flex;
      align-items: center;
    }
    .mobile-bottom-nav a.active, .mobile-bottom-nav a:hover {
      color: var(--accent-gold);
      transform: translateY(-2px);
    }

    /* 板块通用 */
    section {
      padding: 5rem 0;
    }

    .section-label {
      display: inline-block;
      font-weight: 700;
      font-size: 0.9rem;
      letter-spacing: 2px;
      text-transform: uppercase;
      color: var(--accent-gold);
      margin-bottom: 0.8rem;
    }

    h2 {
      font-family: var(--font-heading);
      font-weight: 800;
      font-size: 2.8rem;
      letter-spacing: -0.02em;
      color: var(--primary-deep);
      margin-bottom: 1.5rem;
      line-height: 1.2;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-color: var(--primary-deep);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding-top: 5rem;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(90deg, rgba(26,26,26,0.92) 45%, rgba(26,26,26,0.5) 100%);
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-content h1 {
      font-family: var(--font-heading);
      font-weight: 900;
      font-size: 4rem;
      letter-spacing: -0.03em;
      color: var(--white);
      line-height: 1.1;
      margin-bottom: 1.5rem;
    }
    .hero-content h1 .gold-line {
      display: block;
      width: 80px;
      height: 4px;
      background: var(--accent-gold);
      margin: 1.2rem 0;
    }
    .hero-content p {
      font-size: 1.25rem;
      color: var(--text-light);
      margin-bottom: 2.5rem;
      max-width: 480px;
    }
    .btn-group {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-gold);
      color: var(--primary-deep);
      font-weight: 700;
      padding: 0.9rem 2.5rem;
      border-radius: var(--radius-btn);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      border: 2px solid var(--accent-gold);
      transition: var(--transition-smooth);
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      background: transparent;
      color: var(--accent-gold);
    }
    .btn-outline {
      background: transparent;
      color: var(--white);
      font-weight: 600;
      padding: 0.9rem 2.5rem;
      border-radius: var(--radius-btn);
      text-decoration: none;
      border: 2px solid var(--white);
      transition: var(--transition-smooth);
    }
    .btn-outline:hover {
      background: var(--white);
      color: var(--primary-deep);
    }
    .hero-visual img {
      width: 100%;
      border-radius: 16px;
      box-shadow: 20px 20px 0px rgba(201,168,76,0.2);
      border: 1px solid rgba(255,255,255,0.15);
    }

    /* 核心服务 - 非对称横向卡片 */
    .services {
      background: var(--bg-white);
    }
    .service-grid {
      display: flex;
      flex-direction: column;
      gap: 2.5rem;
      margin-top: 2rem;
    }
    .service-item {
      display: flex;
      align-items: center;
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 2rem 2.5rem;
      box-shadow: var(--shadow-hard);
      transition: var(--transition-smooth);
    }
    .service-item:hover {
      transform: translateX(8px);
      border-color: var(--accent-gold);
    }
    .service-icon {
      font-size: 2.8rem;
      color: #888;
      margin-right: 2.5rem;
      transition: var(--transition-smooth);
    }
    .service-item:hover .service-icon {
      color: var(--accent-gold);
      transform: translateX(4px);
    }
    .service-text h3 {
      font-weight: 700;
      font-size: 1.7rem;
      color: var(--primary-deep);
      margin-bottom: 0.5rem;
    }
    .service-text p {
      color: var(--text-body);
      margin: 0;
    }

    /* 数据背书 */
    .data-section {
      background: var(--primary-deep);
      color: var(--white);
    }
    .data-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .data-item .number {
      font-family: 'Inter', monospace;
      font-weight: 800;
      font-size: 3.5rem;
      color: var(--accent-gold);
      letter-spacing: -0.02em;
    }
    .data-item .desc {
      color: #ccc;
      margin-top: 0.5rem;
    }

    /* 标杆案例 */
    .cases {
      background: var(--bg-white);
    }
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2rem;
      margin-top: 2rem;
    }
    .case-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-hard);
      border: 1px solid var(--border-light);
    }
    .case-card img {
      width: 100%;
      height: 240px;
      object-fit: cover;
    }
    .case-info {
      padding: 1.8rem;
    }
    .case-info h4 {
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary-deep);
    }

    /* 解决方案 步骤 */
    .solutions {
      background: var(--primary-deep);
      color: var(--white);
    }
    .steps {
      display: flex;
      justify-content: space-between;
      margin-top: 2.5rem;
      flex-wrap: wrap;
      gap: 1.5rem;
    }
    .step {
      flex: 1;
      min-width: 140px;
      border-left: 3px solid var(--accent-gold);
      padding-left: 1.8rem;
    }
    .step-num {
      font-weight: 800;
      font-size: 2rem;
      color: var(--accent-gold);
    }

    /* FAQ */
    .faq-section {
      background: var(--bg-white);
    }
    .faq-list {
      max-width: 800px;
      margin: 2rem auto 0;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      font-weight: 700;
      padding: 1.5rem 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      color: var(--primary-deep);
      font-size: 1.2rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #f4f4f4;
      border-left: 4px solid var(--accent-gold);
      padding: 0 1.5rem;
      margin-bottom: 0.5rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 1.5rem;
    }

    /* CTA */
    .cta-section {
      background: var(--primary-deep);
      text-align: center;
      padding: 5rem 0;
    }
    .cta-section h2 {
      color: var(--white);
    }
    .btn-reverse {
      background: var(--white);
      color: var(--primary-deep);
      border: 2px solid var(--white);
      font-weight: 700;
      padding: 1rem 3rem;
      border-radius: var(--radius-btn);
      text-decoration: none;
      display: inline-block;
      margin-top: 2rem;
    }
    .btn-reverse:hover {
      background: var(--accent-gold);
      border-color: var(--accent-gold);
      color: #000;
    }

    /* 页脚 */
    .footer {
      background: #0f0f0f;
      color: #aaa;
      padding: 3rem 0;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 2rem;
    }
    .footer a {
      color: #ccc;
      text-decoration: none;
      margin-right: 1.5rem;
    }
    .footer a:hover {
      color: var(--accent-gold);
    }

    @media (max-width: 1024px) {
      .hero .container {
        grid-template-columns: 1fr;
      }
      .hero-visual {
        display: none;
      }
      .data-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .mobile-bottom-nav {
        display: block;
      }
      h2 {
        font-size: 2.2rem;
      }
      .service-item {
        flex-direction: column;
        text-align: center;
      }
      .service-icon {
        margin-right: 0;
        margin-bottom: 1rem;
      }
      .case-grid {
        grid-template-columns: 1fr;
      }
      .steps {
        flex-direction: column;
      }
      .footer-grid {
        flex-direction: column;
      }
      section {
        padding: 3.5rem 0;
      }
      .hero {
        min-height: 70vh;
      }
      .hero-content h1 {
        font-size: 2.8rem;
      }
    }