/* roulang page: index */
:root {
      --primary-dark: #1C1C1E;
      --primary-deep: #2C2C2E;
      --accent-gold: #C9A96E;
      --accent-gold-hover: #D4B87A;
      --warm-sand: #F5F2EB;
      --white: #FFFFFF;
      --text-dark: #1C1C1E;
      --text-gray: #6B6B6F;
      --text-light: #9A9A9E;
      --border-light: #E0DCD3;
      --border-dark: #3A3A3C;
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.08);
      --shadow-card-hover: 0 12px 28px rgba(0, 0, 0, 0.12);
      --shadow-deep: 0 20px 40px rgba(0, 0, 0, 0.25);
      --radius-md: 8px;
      --radius-lg: 12px;
      --radius-sm: 6px;
      --font-serif: 'Noto Serif SC', 'Times New Roman', '宋体', serif;
      --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      --transition: 0.3s ease;
      --max-width: 1280px;
      --header-height: 64px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-sans);
      line-height: 1.7;
      color: var(--text-dark);
      background-color: var(--warm-sand);
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }

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

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

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

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: var(--white);
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: box-shadow var(--transition);
    }

    .header.scrolled {
      box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
    }

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

    .logo {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.4rem;
      letter-spacing: 1px;
      color: var(--text-dark);
      white-space: nowrap;
    }

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

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-gray);
      position: relative;
      padding-bottom: 4px;
      transition: color var(--transition);
    }

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

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width var(--transition);
    }

    .nav-links a.active::after,
    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-cta {
      background: var(--accent-gold);
      color: var(--primary-dark) !important;
      padding: 8px 18px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: all var(--transition);
    }

    .nav-cta:hover {
      background: var(--accent-gold-hover);
      box-shadow: 0 0 12px rgba(201, 169, 110, 0.4);
    }

    .nav-cta::after {
      display: none;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-dark);
      transition: var(--transition);
      display: block;
    }

    .mobile-nav {
      display: none;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }

      .hamburger {
        display: flex;
      }

      .mobile-nav {
        display: block;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: var(--white);
        border-top: 1px solid var(--border-light);
        box-shadow: 0 -4px 12px rgba(0,0,0,0.04);
        z-index: 999;
        padding: 6px 12px;
      }

      .mobile-nav-inner {
        display: flex;
        align-items: center;
        justify-content: space-around;
        gap: 6px;
        max-width: 500px;
        margin: 0 auto;
      }

      .mobile-nav a {
        font-size: 0.75rem;
        font-weight: 500;
        color: var(--text-gray);
        text-align: center;
        padding: 6px 2px;
        transition: color var(--transition);
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 2px;
      }

      .mobile-nav a i {
        font-size: 1.2rem;
      }

      .mobile-nav a.active {
        color: var(--accent-gold);
      }

      .mobile-nav-cta {
        background: var(--accent-gold);
        color: var(--primary-dark) !important;
        border-radius: 30px;
        padding: 8px 16px !important;
        font-weight: 700;
        font-size: 0.8rem;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1C1C1E 0%, #2A2A2D 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      margin-top: var(--header-height);
      color: var(--white);
    }

    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.18;
      mix-blend-mode: overlay;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-left h1 {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 3rem;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: var(--white);
    }

    .hero-left h1 span {
      color: var(--accent-gold);
    }

    .hero-sub {
      font-size: 1.2rem;
      color: #D1D1D6;
      margin-bottom: 28px;
      max-width: 480px;
    }

    .trust-line {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 28px;
      font-size: 0.9rem;
      color: #B0B0B8;
    }

    .trust-line i {
      color: var(--accent-gold);
    }

    .hero-cta-group {
      display: flex;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent-gold);
      color: var(--primary-dark);
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all var(--transition);
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(201, 169, 110, 0.3);
    }

    .btn-primary:hover {
      background: var(--accent-gold-hover);
      box-shadow: 0 8px 24px rgba(201, 169, 110, 0.5);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: all var(--transition);
      cursor: pointer;
    }

    .btn-outline:hover {
      background: rgba(201, 169, 110, 0.1);
      box-shadow: 0 0 12px rgba(201,169,110,0.3);
    }

    .hero-right {
      background: rgba(44, 44, 46, 0.6);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-lg);
      padding: 32px;
      text-align: center;
    }

    .hero-stat {
      font-family: var(--font-sans);
      font-weight: 700;
      font-size: 3.5rem;
      color: var(--accent-gold);
      font-feature-settings: "tnum";
      letter-spacing: 1px;
    }

    .hero-stat-label {
      color: #C0C0C8;
      font-size: 1rem;
      margin-top: 8px;
    }

    @media (max-width: 1024px) {
      .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-left h1 {
        font-size: 2.4rem;
      }
      .hero-sub {
        margin-left: auto;
        margin-right: auto;
      }
      .hero-cta-group {
        justify-content: center;
      }
    }

    @media (max-width: 768px) {
      .hero-left h1 {
        font-size: 2rem;
      }
    }

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

    .section-title {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 2.2rem;
      margin-bottom: 16px;
      color: var(--text-dark);
    }

    .section-desc {
      color: var(--text-gray);
      font-size: 1.1rem;
      margin-bottom: 48px;
      max-width: 700px;
    }

    /* 指标看板 */
    .metrics-section {
      background: var(--primary-dark);
      color: var(--white);
      padding: 80px 0;
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-card {
      background: rgba(44, 44, 46, 0.7);
      backdrop-filter: blur(10px);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      text-align: center;
    }

    .metric-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-gold);
      font-feature-settings: "tnum";
    }

    .metric-label {
      color: #B0B0B8;
      margin-top: 8px;
    }

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

    /* 服务矩阵 */
    .services-bg {
      background: var(--warm-sand);
    }

    .services-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      grid-template-rows: auto auto;
      gap: 24px;
      align-items: stretch;
    }

    .service-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      border-left: 4px solid transparent;
      display: flex;
      flex-direction: column;
    }

    .service-card.featured {
      border-left: 4px solid var(--accent-gold);
    }

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

    .service-icon {
      font-size: 2rem;
      color: var(--accent-gold);
      margin-bottom: 16px;
    }

    .service-card h3 {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.5rem;
      margin-bottom: 12px;
    }

    .service-card p {
      color: var(--text-gray);
      flex: 1;
    }

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

    /* 对比 */
    .compare-section {
      background: var(--primary-dark);
      color: white;
    }

    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 20px;
      align-items: center;
    }

    .compare-col {
      background: rgba(44,44,46,0.5);
      border-radius: var(--radius-lg);
      padding: 32px;
    }

    .compare-col.right {
      background: rgba(44,44,46,0.8);
      border: 1px solid var(--accent-gold);
    }

    .compare-col h3 {
      font-family: var(--font-serif);
      margin-bottom: 20px;
    }

    .compare-item {
      display: flex;
      justify-content: space-between;
      margin-bottom: 16px;
    }

    .vs-divider {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent-gold);
    }

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

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

    .case-card {
      background: var(--white);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .case-card img {
      width: 100%;
      height: 240px;
      object-fit: cover;
    }

    .case-body {
      padding: 24px;
    }

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

    /* FAQ */
    .faq-section {
      background: var(--primary-dark);
      color: white;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-dark);
      padding: 20px 0;
    }

    .faq-question {
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
    }

    .faq-answer {
      margin-top: 12px;
      color: #C0C0C8;
      display: none;
    }

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

    /* 表单 */
    .cta-form-section {
      background: var(--primary-dark);
    }

    .form-card {
      background: var(--white);
      max-width: 600px;
      margin: 0 auto;
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-deep);
    }

    .form-card input {
      width: 100%;
      border: 1px solid var(--border-light);
      padding: 14px;
      margin-bottom: 16px;
      border-radius: var(--radius-sm);
    }

    /* 页脚 */
    .footer {
      background: #2C2C2E;
      color: #C0C0C8;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

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