/* roulang page: index */
:root {
      --primary-deep: #1A1A2E;
      --gold: #C9A96E;
      --gold-hover: #D4B87A;
      --accent-red: #D94F4F;
      --accent-red-hover: #C13E3E;
      --bg-light: #F9F6F1;
      --text-dark: #2D2D2D;
      --text-muted: #6B6B6B;
      --white: #FFFFFF;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.06);
      --card-shadow-hover: 0 8px 30px rgba(0,0,0,0.10);
      --border-radius-card: 12px;
      --border-radius-btn: 8px;
      --border-radius-input: 6px;
      --transition-smooth: 0.3s ease;
      --font-zh: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-en: "Inter", "SF Pro Display", sans-serif;
      --max-width: 1200px;
      --section-padding: 80px 24px;
      --section-padding-mobile: 48px 16px;
    }

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

    body {
      font-family: var(--font-zh);
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航 */
    #nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 40px;
      backdrop-filter: blur(0px);
    }

    #nav.scrolled {
      background: rgba(26, 26, 46, 0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--gold);
      letter-spacing: 1px;
      text-decoration: none;
      white-space: nowrap;
      font-family: var(--font-zh);
    }

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

    .nav-links a {
      color: var(--white);
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      letter-spacing: 0.3px;
    }

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

    .nav-cta {
      border: 2px solid var(--gold);
      color: var(--gold);
      background: transparent;
      padding: 10px 24px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.2s;
      font-size: 15px;
      white-space: nowrap;
    }

    .nav-cta:hover {
      background: var(--gold);
      color: var(--primary-deep);
    }

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

    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--white);
      transition: 0.3s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(26, 26, 46, 0.96);
      backdrop-filter: blur(20px);
      z-index: 1001;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
    }

    .mobile-menu a {
      color: var(--white);
      font-size: 20px;
      text-decoration: none;
      font-weight: 500;
    }

    .mobile-menu .close-btn {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 32px;
      color: var(--white);
      background: none;
      border: none;
      cursor: pointer;
    }

    @media (max-width: 768px) {
      #nav {
        padding: 16px 24px;
      }
      .nav-links, .nav-cta {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }

    /* Hero */
    #hero {
      height: 100vh;
      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;
      color: var(--white);
    }

    #hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(to bottom, rgba(26,26,46,0.4) 0%, rgba(26,26,46,0.8) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      padding: 0 24px;
    }

    .hero-content h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 20px;
      color: var(--white);
    }

    .hero-content p {
      font-size: 20px;
      margin-bottom: 40px;
      opacity: 0.9;
    }

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

    .btn-primary {
      background: var(--gold);
      color: var(--primary-deep);
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: 0.2s;
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--gold-hover);
      box-shadow: 0 0 15px rgba(201,169,110,0.3);
    }

    .btn-outline {
      border: 2px solid var(--gold);
      color: var(--gold);
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      text-decoration: none;
      background: transparent;
      transition: 0.2s;
    }

    .btn-outline:hover {
      background: rgba(201,169,110,0.1);
    }

    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      animation: pulse 2s infinite;
      color: var(--white);
      font-size: 24px;
    }

    @keyframes pulse {
      0% { opacity: 0.6; transform: translateX(-50%) translateY(0); }
      50% { opacity: 1; transform: translateX(-50%) translateY(8px); }
      100% { opacity: 0.6; transform: translateX(-50%) translateY(0); }
    }

    @media (max-width: 768px) {
      .hero-content h1 {
        font-size: 32px;
        line-height: 1.3;
      }
      .hero-content p {
        font-size: 18px;
      }
    }

    /* 通用区块 */
    section {
      padding: var(--section-padding);
    }

    @media (max-width: 768px) {
      section {
        padding: var(--section-padding-mobile);
      }
    }

    .section-title {
      font-size: 36px;
      font-weight: 600;
      text-align: center;
      margin-bottom: 48px;
      color: var(--primary-deep);
    }

    @media (max-width: 768px) {
      .section-title {
        font-size: 28px;
        margin-bottom: 32px;
      }
    }

    /* 优势 */
    #advantages {
      background: var(--bg-light);
    }

    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .advantage-card {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--border-radius-card);
      box-shadow: var(--card-shadow);
      text-align: center;
      transition: all var(--transition-smooth);
    }

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

    .advantage-icon {
      font-size: 36px;
      color: var(--gold);
      margin-bottom: 16px;
    }

    .advantage-card h3 {
      font-size: 24px;
      margin-bottom: 12px;
    }

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

    /* 服务网格 2x3 */
    #services {
      background: var(--white);
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--white);
      border-radius: var(--border-radius-card);
      box-shadow: var(--card-shadow);
      overflow: hidden;
      transition: all var(--transition-smooth);
      display: flex;
      flex-direction: column;
    }

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

    .service-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }

    .service-card-body {
      padding: 24px;
      flex: 1;
    }

    .service-card h3 {
      font-size: 22px;
      margin-bottom: 8px;
    }

    .service-link {
      color: var(--gold);
      text-decoration: none;
      font-weight: 600;
      margin-top: 12px;
      display: inline-block;
    }

    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

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

    /* 场景交替 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }

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

    .scenario-img {
      flex: 1;
    }

    .scenario-img img {
      width: 100%;
      border-radius: var(--border-radius-card);
    }

    .scenario-text {
      flex: 1;
    }

    .scenario-text h3 {
      font-size: 28px;
      margin-bottom: 16px;
    }

    @media (max-width: 768px) {
      .scenario-row, .scenario-row.reverse {
        flex-direction: column;
      }
    }

    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
    }

    .case-card {
      min-width: 320px;
      background: var(--white);
      border-radius: var(--border-radius-card);
      box-shadow: var(--card-shadow);
      overflow: hidden;
      flex-shrink: 0;
    }

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

    .case-body {
      padding: 20px;
    }

    .case-stat {
      font-size: 28px;
      color: var(--gold);
      font-weight: 700;
    }

    @media (max-width: 768px) {
      .cases-scroll {
        flex-direction: column;
        overflow-x: visible;
      }
      .case-card {
        min-width: auto;
      }
    }

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

    .pricing-card {
      background: var(--white);
      border-radius: var(--border-radius-card);
      box-shadow: var(--card-shadow);
      padding: 32px 24px;
      text-align: center;
      border: 2px solid transparent;
      transition: 0.3s;
    }

    .pricing-card.featured {
      border-color: var(--gold);
      box-shadow: 0 12px 30px rgba(0,0,0,0.1);
      transform: scale(1.02);
    }

    .badge {
      background: var(--accent-red);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      display: inline-block;
      margin-bottom: 12px;
    }

    .price {
      font-size: 42px;
      color: var(--gold);
      font-weight: 700;
      margin: 16px 0;
    }

    @media (max-width: 768px) {
      .pricing-grid {
        grid-template-columns: 1fr;
      }
      .pricing-card.featured {
        transform: none;
      }
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #eee;
      margin-bottom: 8px;
    }

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 20px 24px;
      background: none;
      border: none;
      font-size: 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, background 0.3s;
      padding: 0 24px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
      background: rgba(201,169,110,0.04);
    }

    /* 联系表单 */
    #contact {
      background: var(--primary-deep);
      color: white;
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .contact-form input, .contact-form textarea {
      width: 100%;
      padding: 14px;
      margin-bottom: 16px;
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: var(--border-radius-input);
      color: white;
    }

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

    .btn-gold {
      background: var(--gold);
      color: var(--primary-deep);
      border: none;
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      cursor: pointer;
      width: 100%;
    }

    footer {
      background: #0f0f1a;
      color: #aaa;
      text-align: center;
      padding: 24px;
    }

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