/* roulang page: index */
:root {
      --deep-blue: #1A1A2E;
      --champagne-gold: #C9A84C;
      --venetian-red: #E85D3F;
      --warm-ivory: #FBF7F0;
      --dark-bg: #0F0F1A;
      --text-primary: #1A1A2E;
      --text-secondary: #4A4A5A;
      --text-on-dark: #F5EFE6;
      --success-green: #2D6A4F;
      --card-bg: #FFFFFF;
      --border-gold-light: rgba(201,168,76,0.15);
      --border-gold-medium: rgba(201,168,76,0.4);
      --shadow-sm: 0 2px 12px rgba(26,26,46,0.06);
      --shadow-hover: 0 8px 28px rgba(26,26,46,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-chip: 20px;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Noto Sans SC', 'Helvetica Neue', sans-serif;
      --font-data: 'Inter', system-ui, -apple-system, sans-serif;
      --transition-smooth: all 0.25s ease;
      --container-max: 1200px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-ivory);
      color: var(--text-primary);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      font-weight: 600;
      letter-spacing: 0.5px;
    }

    h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
    }

    h2 {
      font-size: 2.25rem;
      margin-bottom: 0.5rem;
    }

    h3 {
      font-size: 1.375rem;
      font-weight: 600;
    }

    h4 {
      font-family: var(--font-sans);
      font-weight: 500;
      font-size: 1.1rem;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 导航栏 */
    #main-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(251, 247, 240, 0.92);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(26, 26, 46, 0.08);
      z-index: 50;
      display: flex;
      align-items: center;
      transition: var(--transition-smooth);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .logo-icon {
      font-size: 2rem;
      color: var(--champagne-gold);
      line-height: 1;
    }

    .logo-text {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--deep-blue);
      letter-spacing: 1px;
    }

    .nav-chips {
      display: flex;
      gap: 4px;
      align-items: center;
      flex-wrap: wrap;
    }

    .nav-chip {
      background: transparent;
      color: var(--text-secondary);
      padding: 0.5rem 1.2rem;
      border-radius: var(--radius-chip);
      font-size: 0.9rem;
      font-weight: 500;
      text-decoration: none;
      transition: var(--transition-smooth);
      white-space: nowrap;
    }

    .nav-chip:hover {
      background: rgba(26, 26, 46, 0.06);
      color: var(--deep-blue);
    }

    .nav-chip.active {
      background: var(--deep-blue);
      color: var(--champagne-gold);
    }

    .nav-cta {
      background: var(--champagne-gold);
      color: var(--deep-blue);
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      text-decoration: none;
      transition: var(--transition-smooth);
      border: none;
      cursor: pointer;
      white-space: nowrap;
    }

    .nav-cta:hover {
      background: #D4B55A;
      box-shadow: 0 4px 16px rgba(201,168,76,0.35);
      transform: scale(1.02);
      color: var(--deep-blue);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--deep-blue);
      cursor: pointer;
    }

    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center 30%;
      position: relative;
      margin-top: 0;
      padding-top: 72px;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,26,46,0.85) 0%, rgba(15,15,26,0.75) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      color: white;
      padding: 2rem 0;
    }

    .hero-content h1 {
      color: #FFFFFF;
      text-shadow: 0 2px 20px rgba(0,0,0,0.6);
      margin-bottom: 1.5rem;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.88);
      margin-bottom: 2.5rem;
      line-height: 1.7;
    }

    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--champagne-gold);
      color: var(--deep-blue);
      padding: 0.9rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
      transition: var(--transition-smooth);
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: #D4B55A;
      box-shadow: 0 4px 16px rgba(201,168,76,0.4);
      transform: scale(1.02);
      color: var(--deep-blue);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid #FFFFFF;
      color: #FFFFFF;
      padding: 0.9rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition-smooth);
    }

    .btn-outline:hover {
      background: #FFFFFF;
      color: var(--deep-blue);
    }

    /* 指标看板 */
    #metrics {
      background-color: var(--dark-bg);
      background-image: repeating-linear-gradient(45deg, rgba(201,168,76,0.05) 0px, rgba(201,168,76,0.05) 2px, transparent 2px, transparent 8px);
      padding: 5rem 0;
      color: var(--text-on-dark);
    }

    .metrics-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      text-align: center;
      gap: 2rem;
    }

    .metric-item {
      flex: 1 1 150px;
    }

    .metric-number {
      font-family: var(--font-data);
      font-weight: 700;
      font-size: 3.5rem;
      color: var(--champagne-gold);
      line-height: 1.2;
    }

    .metric-icon {
      font-size: 2rem;
      color: var(--champagne-gold);
      margin-bottom: 0.5rem;
    }

    .metric-label {
      color: rgba(245,239,230,0.8);
      margin-top: 0.5rem;
      font-size: 0.95rem;
      border-top: 1px solid rgba(201,168,76,0.3);
      padding-top: 0.75rem;
      display: inline-block;
    }

    /* 服务矩阵 */
    #services {
      padding: 5rem 0;
      background: var(--warm-ivory);
    }

    .section-title {
      text-align: center;
      margin-bottom: 1rem;
      color: var(--deep-blue);
    }

    .gold-divider {
      width: 80px;
      height: 2px;
      background: linear-gradient(90deg, transparent, var(--champagne-gold), transparent);
      margin: 1rem auto 3rem;
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-gold-light);
      transition: var(--transition-smooth);
      text-align: center;
    }

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

    .service-icon-circle {
      width: 64px;
      height: 64px;
      background: rgba(201,168,76,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1.5rem;
      font-size: 1.8rem;
      color: var(--champagne-gold);
    }

    .service-card h3 {
      margin-bottom: 1rem;
    }

    .service-card p {
      color: var(--text-secondary);
      font-size: 0.95rem;
      margin-bottom: 1.5rem;
    }

    .text-link {
      color: var(--champagne-gold);
      text-decoration: none;
      border-bottom: 1px solid transparent;
      font-weight: 500;
      transition: var(--transition-smooth);
    }

    .text-link:hover {
      border-bottom: 2px solid var(--champagne-gold);
    }

    /* 对比区 */
    #compare {
      background: #FFFFFF;
      padding: 5rem 0;
    }

    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2.5rem;
      align-items: start;
    }

    .challenge-box, .solution-box {
      padding: 2rem;
      border-radius: var(--radius-card);
      height: fit-content;
    }

    .challenge-box {
      background: rgba(232,93,63,0.04);
      border-left: 6px solid var(--venetian-red);
    }

    .solution-box {
      background: rgba(45,106,79,0.04);
      border-left: 6px solid var(--success-green);
    }

    .compare-list {
      list-style: none;
      margin-top: 1.5rem;
    }

    .compare-list li {
      margin-bottom: 1rem;
      display: flex;
      align-items: center;
      gap: 0.8rem;
      font-size: 1.1rem;
    }

    .compare-center {
      text-align: center;
      margin-top: 3rem;
    }

    /* FAQ */
    #faq {
      padding: 5rem 0;
      background: var(--warm-ivory);
    }

    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.5rem;
    }

    .faq-item {
      background: #FFFFFF;
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid rgba(201,168,76,0.1);
    }

    .faq-question {
      padding: 1.2rem 1.5rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 500;
      background: #FFFFFF;
      transition: background 0.2s;
    }

    .faq-question h4 {
      margin: 0;
      font-size: 1rem;
    }

    .faq-answer {
      padding: 0 1.5rem 1.2rem;
      color: var(--text-secondary);
      display: none;
      border-top: 1px solid rgba(201,168,76,0.2);
      background: #FAF8F4;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-item.active .faq-question {
      border-bottom: 2px solid var(--champagne-gold);
    }

    /* 转化表单 */
    #contact {
      background: var(--deep-blue);
      background-image: linear-gradient(45deg, rgba(201,168,76,0.08) 0%, transparent 50%);
      padding: 5rem 0;
      color: white;
    }

    .contact-card {
      background: #FFFFFF;
      color: var(--text-primary);
      border-radius: var(--radius-card);
      padding: 2.5rem;
      max-width: 640px;
      margin: 2rem auto 0;
      box-shadow: 0 12px 30px rgba(0,0,0,0.2);
    }

    .form-input {
      width: 100%;
      padding: 0.8rem 1rem;
      border: 1px solid #ddd;
      border-radius: 6px;
      margin-bottom: 1.2rem;
      font-family: var(--font-sans);
    }

    .btn-full {
      width: 100%;
    }

    /* 页脚 */
    #footer {
      background: var(--dark-bg);
      color: rgba(245,239,230,0.7);
      padding: 4rem 0 2rem;
      font-size: 0.9rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
      margin-bottom: 2rem;
    }

    .footer-bottom {
      border-top: 1px solid rgba(201,168,76,0.2);
      padding-top: 1.5rem;
      text-align: center;
      font-size: 0.8rem;
    }

    .social-icons i {
      font-size: 1.4rem;
      margin-right: 1rem;
      color: rgba(245,239,230,0.6);
      transition: color 0.2s;
    }

    .social-icons i:hover {
      color: var(--champagne-gold);
    }

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

    @media (max-width: 768px) {
      h1 { font-size: 2.2rem; }
      h2 { font-size: 1.8rem; }
      .nav-chips, .nav-cta.desktop-cta { display: none; }
      .hamburger { display: block; }
      .services-grid, .faq-grid { grid-template-columns: 1fr; }
      .hero-content { text-align: center; }
      .hero-buttons { justify-content: center; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .metrics-grid { justify-content: center; }
    }

    @media (max-width: 520px) {
      .footer-grid { grid-template-columns: 1fr; }
      .metric-number { font-size: 2.8rem; }
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(251,247,240,0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      padding: 2rem;
      z-index: 40;
    }

    .mobile-menu.open {
      display: flex;
    }