/* roulang page: index */
:root {
      --primary: #0A0F1E;
      --secondary: #C9A96E;
      --accent: #E84A4A;
      --bg: #F8F7F4;
      --card-bg: #FFFFFF;
      --text-primary: #0A0F1E;
      --text-body: #3A3A3E;
      --text-muted: #7B7B80;
      --text-on-dark: #FFFFFF;
      --border-light: #E5E3DD;
      --border-gold: rgba(201, 169, 110, 0.25);
      --shadow-sm: 0 4px 20px rgba(10, 15, 30, 0.04);
      --shadow-hover: 0 12px 32px rgba(10, 15, 30, 0.08);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-container: 24px;
      --font-cn: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-en: "Inter", "SF Pro Display", system-ui, sans-serif;
      --transition-smooth: 0.3s ease;
      --max-width: 1280px;
      --section-padding: 100px;
      --mobile-padding: 60px;
    }

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

    body {
      font-family: var(--font-cn);
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, .font-en {
      font-family: var(--font-cn);
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航栏 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(10, 15, 30, 0.75);
      backdrop-filter: blur(20px) saturate(180%);
      -webkit-backdrop-filter: blur(20px) saturate(180%);
      border-bottom: 1px solid rgba(201, 169, 110, 0.15);
      box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }

    .nav.scrolled {
      background: rgba(10, 15, 30, 0.95);
      box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      letter-spacing: 0.05em;
      color: var(--secondary);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }

    .logo::before {
      content: "◆";
      font-size: 10px;
      color: var(--secondary);
    }

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

    .nav-links a {
      color: #F8F7F4;
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      position: relative;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--secondary);
      transition: width 0.3s ease;
    }

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

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

    .btn-nav {
      background: var(--secondary);
      color: var(--primary) !important;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background 0.3s;
      white-space: nowrap;
    }

    .btn-nav:hover {
      background: #D4B87A;
      color: var(--primary) !important;
    }

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

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

    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: #F8F7F4;
      transition: 0.3s;
    }

    .hamburger span.short {
      width: 16px;
      align-self: flex-end;
    }

    @media (max-width: 1024px) {
      .nav-links {
        gap: 20px;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: rgba(10, 15, 30, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        gap: 32px;
        transition: right 0.4s ease;
        z-index: 40;
      }
      .nav-links.active {
        right: 0;
      }
      .nav-links a {
        font-size: 20px;
      }
      .hamburger {
        display: flex;
        z-index: 55;
      }
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      display: flex;
      align-items: center;
      min-height: 90vh;
      background: linear-gradient(135deg, #F8F7F4 0%, #f0ede6 100%);
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }

    .hero-text {
      flex: 1 1 55%;
    }

    .hero-visual {
      flex: 1 1 45%;
      position: relative;
      height: 420px;
      border-radius: var(--radius-container);
      background: #0A0F1E;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .hero-bg-img {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.35;
    }

    .geo-layer {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(201,169,110,0.15) 0%, transparent 60%);
    }

    .floating-diamond {
      position: absolute;
      width: 80px;
      height: 80px;
      border: 2px solid rgba(201,169,110,0.5);
      transform: rotate(45deg);
      animation: floatDiamond 6s ease-in-out infinite;
      top: 20%;
      right: 15%;
    }

    @keyframes floatDiamond {
      0% { transform: rotate(45deg) translateY(0); }
      50% { transform: rotate(45deg) translateY(-12px); }
      100% { transform: rotate(45deg) translateY(0); }
    }

    .hero-label {
      font-size: 13px;
      font-weight: 600;
      letter-spacing: 0.1em;
      color: var(--secondary);
      text-transform: uppercase;
      margin-bottom: 16px;
    }

    .hero h1 {
      font-size: 56px;
      line-height: 1.15;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--text-primary);
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 18px;
      line-height: 1.6;
      color: #5A5A60;
      max-width: 480px;
      margin-bottom: 40px;
    }

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

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 16px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: background 0.3s, color 0.3s;
      display: inline-block;
      border: none;
      cursor: pointer;
      font-size: 16px;
    }

    .btn-primary:hover {
      background: var(--secondary);
      color: var(--primary);
    }

    .btn-ghost {
      color: var(--secondary);
      font-weight: 600;
      text-decoration: none;
      border-bottom: 2px solid transparent;
      transition: border-color 0.3s;
      padding-bottom: 4px;
    }

    .btn-ghost:hover {
      border-color: var(--secondary);
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 36px;
        line-height: 1.2;
      }
      .hero-visual {
        height: 280px;
        width: 100%;
      }
      .hero-content {
        flex-direction: column;
      }
    }

    /* 通用区块 */
    section {
      padding: var(--section-padding) 0;
    }

    .section-title {
      font-size: 42px;
      font-weight: 600;
      letter-spacing: -0.01em;
      color: var(--text-primary);
      margin-bottom: 16px;
    }

    .section-sub {
      color: #5A5A60;
      max-width: 640px;
      margin-bottom: 48px;
    }

    @media (max-width: 768px) {
      section {
        padding: var(--mobile-padding) 0;
      }
      .section-title {
        font-size: 30px;
      }
    }

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

    .adv-card {
      background: #F3F2EE;
      border-radius: var(--radius-card);
      padding: 40px 32px;
      transition: all 0.3s ease;
    }

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

    .adv-icon {
      width: 48px;
      height: 48px;
      color: var(--secondary);
      margin-bottom: 20px;
      transition: transform 0.3s;
    }

    .adv-card:hover .adv-icon {
      transform: scale(1.05);
    }

    .adv-card h3 {
      font-size: 24px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--text-primary);
    }

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

    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

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

    .service-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      background: #E5E3DD;
    }

    .service-body {
      padding: 24px;
    }

    .service-body h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .arrow-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      border-radius: 50%;
      border: 1.5px solid var(--secondary);
      color: var(--secondary);
      margin-top: 16px;
      transition: 0.3s;
      text-decoration: none;
    }

    .service-card:hover .arrow-btn {
      background: var(--secondary);
      color: white;
    }

    @media (max-width: 1024px) {
      .grid-3, .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .grid-3, .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 信任数据 */
    .trust-section {
      background: var(--primary);
      color: white;
    }

    .trust-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }

    .trust-number {
      font-family: var(--font-en);
      font-size: 48px;
      font-weight: 700;
      color: var(--secondary);
    }

    .trust-label {
      font-size: 14px;
      font-weight: 500;
      color: rgba(255,255,255,0.7);
      margin-top: 8px;
    }

    @media (max-width: 768px) {
      .trust-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

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

    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
    }

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

    .case-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      transition: transform 0.3s;
    }

    .case-card:hover .case-img {
      transform: scale(1.02);
    }

    .case-tag {
      background: rgba(201,169,110,0.1);
      color: var(--secondary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
      display: inline-block;
      margin: 16px 0 8px;
    }

    .case-body {
      padding: 0 20px 24px;
    }

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

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }

    .step {
      text-align: center;
      flex: 1;
      position: relative;
    }

    .step-circle {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      border: 2px solid var(--secondary);
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-weight: 700;
      color: var(--secondary);
      background: white;
      transition: 0.3s;
    }

    .step:hover .step-circle {
      background: var(--secondary);
      color: white;
    }

    .step-line {
      position: absolute;
      top: 24px;
      left: 50%;
      width: 100%;
      height: 2px;
      background: #E5E3DD;
      z-index: -1;
    }

    .step:last-child .step-line {
      display: none;
    }

    @media (max-width: 768px) {
      .process-steps {
        flex-direction: column;
        gap: 32px;
      }
      .step-line {
        display: none;
      }
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }

    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: #5A5A60;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 16px;
    }

    .faq-item.active .faq-question {
      color: var(--secondary);
    }

    /* CTA */
    .cta-banner {
      background: var(--primary);
      text-align: center;
      padding: 80px 24px;
    }

    .cta-banner h2 {
      color: white;
    }

    .btn-gold {
      background: var(--secondary);
      color: var(--primary);
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
      margin-top: 24px;
    }

    .footer {
      background: var(--primary);
      color: rgba(255,255,255,0.6);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    .footer a {
      color: rgba(255,255,255,0.7);
      text-decoration: none;
    }

    .footer a:hover {
      color: var(--secondary);
    }

    .copyright {
      text-align: center;
      font-size: 12px;
      color: rgba(255,255,255,0.4);
      margin-top: 40px;
    }

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