/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary-black: #0B0C10;
      --accent-gold: #C5A86B;
      --teal-cyan: #45A29E;
      --surface-gray: #1F2029;
      --text-main: #F0F0F0;
      --text-muted: #A0A0B0;
      --text-high: #FFFFFF;
      --border-gold: rgba(197, 168, 107, 0.2);
      --glass-bg: rgba(11, 12, 16, 0.75);
      --glass-border: rgba(197, 168, 107, 0.15);
      --card-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
      --card-hover-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
      --radius-card: 12px;
      --radius-btn: 6px;
      --radius-input: 6px;
      --radius-container: 16px;
      --font-sans: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--primary-black);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    h2 {
      font-weight: 600;
      font-size: clamp(1.8rem, 4vw, 2.8rem);
      letter-spacing: -0.01em;
      margin-bottom: 1rem;
      color: var(--text-high);
    }
    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }
    .gold-line {
      width: 60px;
      height: 2px;
      background: var(--accent-gold);
      margin: 0.5rem 0 1.5rem;
    }
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 1000;
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--glass-border);
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
    }
    .navbar.scrolled {
      background: rgba(11, 12, 16, 0.95);
      backdrop-filter: none;
      -webkit-backdrop-filter: none;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      height: 72px;
    }
    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--accent-gold);
      text-decoration: none;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo svg {
      width: 28px;
      height: 28px;
      stroke: var(--accent-gold);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: #E0E0E0;
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--accent-gold);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      border: 1px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 8px 20px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      font-weight: 500;
      transition: all 0.3s ease;
      background: transparent;
    }
    .nav-cta:hover {
      background: var(--accent-gold);
      color: #0B0C10;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--accent-gold);
      transition: 0.3s;
    }
    @media (max-width: 1023px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(11, 12, 16, 0.98);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--glass-border);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .nav-cta.desktop {
        display: none;
      }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 30% 30%, rgba(69, 162, 158, 0.08) 0%, transparent 60%),
                  radial-gradient(circle at 70% 60%, rgba(197, 168, 107, 0.05) 0%, transparent 50%),
                  var(--primary-black);
    }
    .hero-canvas {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      padding: 0 24px;
    }
    .hero h1 {
      font-weight: 700;
      font-size: clamp(2.5rem, 6vw, 4.5rem);
      letter-spacing: -0.02em;
      line-height: 1.15;
      background: linear-gradient(135deg, #C5A86B, #F0D89A);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.5rem;
    }
    .hero p {
      color: #B0B0C0;
      font-size: 1.25rem;
      max-width: 600px;
      margin: 0 auto 2.5rem;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-gold);
      color: #0B0C10;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 0 15px rgba(197, 168, 107, 0.4);
    }
    .btn-ghost {
      border: 1px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      background: transparent;
      transition: all 0.3s ease;
    }
    .btn-ghost:hover {
      background: rgba(197, 168, 107, 0.1);
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      animation: bounce 2s infinite;
      color: var(--accent-gold);
    }
    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
      40% { transform: translateX(-50%) translateY(-10px); }
      60% { transform: translateX(-50%) translateY(-5px); }
    }
    /* 优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .adv-item .adv-number {
      font-weight: 700;
      font-size: 2.5rem;
      color: var(--accent-gold);
      font-feature-settings: "tnum";
    }
    .adv-item p {
      color: var(--text-muted);
      margin-top: 0.5rem;
    }
    @media (max-width: 768px) {
      .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .service-card {
      background: var(--surface-gray);
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid transparent;
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      box-shadow: var(--card-shadow);
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
      border-color: var(--accent-gold);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      border: 1px solid var(--accent-gold);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
      color: var(--teal-cyan);
    }
    .service-card h3 {
      font-weight: 600;
      font-size: 1.25rem;
      margin-bottom: 12px;
    }
    .service-card p {
      color: var(--text-muted);
      margin-bottom: 20px;
    }
    .service-link {
      color: var(--accent-gold);
      text-decoration: none;
      font-weight: 500;
      transition: 0.2s;
    }
    .service-link:hover {
      padding-left: 5px;
    }
    @media (max-width: 1023px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 640px) {
      .services-grid { grid-template-columns: 1fr; }
    }
    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      position: relative;
    }
    .step {
      flex: 1;
      text-align: center;
      padding: 0 16px;
    }
    .step-num {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--surface-gray);
      border: 2px solid var(--accent-gold);
      color: var(--accent-gold);
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-weight: 700;
      font-size: 1.25rem;
    }
    .step h4 {
      margin-bottom: 8px;
    }
    .step p {
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    @media (max-width: 768px) {
      .steps {
        flex-direction: column;
        gap: 32px;
      }
    }
    /* 案例 */
    .case-card {
      display: flex;
      background: var(--surface-gray);
      border-radius: var(--radius-container);
      overflow: hidden;
      margin-bottom: 32px;
      box-shadow: var(--card-shadow);
    }
    .case-img {
      width: 40%;
      object-fit: cover;
    }
    .case-info {
      padding: 32px;
      width: 60%;
    }
    .tag {
      background: rgba(69, 162, 158, 0.15);
      color: var(--teal-cyan);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 12px;
    }
    .case-info h3 {
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .case-card {
        flex-direction: column;
      }
      .case-img, .case-info {
        width: 100%;
      }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(197, 168, 107, 0.1);
    }
    .faq-question {
      padding: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 500;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: var(--surface-gray);
      color: #C0C0D0;
      padding: 0 20px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 20px 20px;
    }
    /* 联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      background: #0B0C10;
    }
    .contact-form input, .contact-form textarea {
      width: 100%;
      background: #1A1B22;
      border: 1px solid rgba(197, 168, 107, 0.25);
      border-radius: var(--radius-input);
      padding: 14px;
      margin-bottom: 16px;
      color: white;
    }
    .contact-form input:focus, .contact-form textarea:focus {
      border-color: var(--accent-gold);
      outline: none;
    }
    .btn-submit {
      background: var(--accent-gold);
      width: 100%;
      padding: 14px;
      border: none;
      font-weight: 600;
      border-radius: var(--radius-btn);
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .contact-grid {
        grid-template-columns: 1fr;
      }
    }
    footer {
      background: #06070A;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer-col h4 {
      color: var(--accent-gold);
      margin-bottom: 16px;
    }
    .footer-col a {
      color: #808090;
      text-decoration: none;
      display: block;
      margin-bottom: 8px;
    }
    .footer-col a:hover {
      color: var(--accent-gold);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }