/* roulang page: index */
:root {
      --primary: #1A1A1A;
      --accent: #C8A96E;
      --accent-hover: #B8944A;
      --secondary: #2B2B2B;
      --surface: #FFFFFF;
      --muted: #F5F3EF;
      --text-primary: #1A1A1A;
      --text-secondary: #5C5C5C;
      --text-on-dark: #E0E0E0;
      --border-subtle: #E6E3DD;
      --shadow-card: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 20px 40px rgba(0,0,0,0.12), 0 4px 12px rgba(0,0,0,0.08);
      --radius-card: 8px;
      --radius-btn: 4px;
      --font-serif: "Playfair Display", "Cormorant Garamond", serif;
      --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --transition-smooth: 0.25s cubic-bezier(0.23, 1, 0.32, 1);
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--surface);
      color: var(--text-primary);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, .button {
      cursor: pointer;
      border: none;
      outline: none;
      font-family: var(--font-sans);
      font-weight: 600;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .section-padding {
      padding: 120px 0;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 100;
      background: transparent;
      transition: background 0.3s, box-shadow 0.3s, backdrop-filter 0.3s;
      padding: 16px 0;
    }

    .navbar.scrolled {
      background: rgba(26, 26, 26, 0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.15);
      padding: 8px 0;
    }

    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }

    .logo {
      font-family: var(--font-serif);
      font-size: 1.5rem;
      font-weight: 700;
      letter-spacing: 0.08em;
      color: var(--accent);
      display: flex;
      align-items: baseline;
      gap: 4px;
      white-space: nowrap;
    }

    .logo span {
      font-family: var(--font-sans);
      font-weight: 600;
      font-size: 1.3rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
      margin: 0;
    }

    .nav-links a {
      color: #B0B0B0;
      font-weight: 500;
      font-size: 0.95rem;
      letter-spacing: 0.03em;
      transition: color 0.25s;
      position: relative;
      padding-bottom: 4px;
    }

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

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s;
    }

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

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .search-icon {
      color: #B0B0B0;
      font-size: 1.2rem;
      transition: color 0.25s;
    }

    .search-icon:hover {
      color: var(--accent);
    }

    .hot-tags {
      display: flex;
      gap: 8px;
    }

    .hot-tag {
      background: transparent;
      border: 1px solid rgba(200,169,110,0.4);
      color: var(--accent);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 500;
      letter-spacing: 0.04em;
      white-space: nowrap;
    }

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

    /* Hero */
    #hero {
      height: 100vh;
      min-height: 600px;
      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;
    }

    #hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(180deg, rgba(26,26,26,0.7) 0%, rgba(26,26,26,0.85) 100%);
    }

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

    .hero-content h1 {
      font-family: var(--font-serif);
      font-size: 3.5rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.15;
      color: white;
      margin-bottom: 20px;
      text-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }

    .hero-content .subtitle {
      font-size: 1.3rem;
      color: var(--text-on-dark);
      margin-bottom: 40px;
      font-weight: 400;
    }

    .btn-group {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent);
      color: var(--primary);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      box-shadow: 0 4px 12px rgba(200,169,110,0.3);
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(200,169,110,0.4);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent);
      color: var(--accent);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
    }

    .btn-outline:hover {
      background: var(--accent);
      color: var(--primary);
      transform: translateY(-2px);
    }

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

    @keyframes float {
      0%, 100% { transform: translateX(-50%) translateY(0); }
      50% { transform: translateX(-50%) translateY(10px); }
    }

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

    .advantages-grid {
      display: flex;
      gap: 60px;
      align-items: flex-start;
    }

    .adv-left h2 {
      font-family: var(--font-serif);
      font-size: 2.5rem;
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 20px;
      white-space: nowrap;
    }

    .adv-right {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 28px;
    }

    .adv-item {
      display: flex;
      gap: 24px;
      padding-bottom: 24px;
      border-bottom: 1px solid var(--border-subtle);
    }

    .adv-item:last-child { border-bottom: none; }
    .adv-icon { font-size: 2.5rem; color: var(--accent); width: 48px; text-align: center; }
    .adv-text h3 { font-size: 1.5rem; font-weight: 600; margin-bottom: 8px; }
    .adv-text p { color: var(--text-secondary); }

    /* 服务 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }

    .service-row.reverse { flex-direction: row-reverse; }
    .service-img {
      flex: 0 0 48%;
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid rgba(200,169,110,0.25);
    }

    .service-img img { width: 100%; object-fit: cover; }
    .service-text { flex: 1; }
    .service-text h3 { font-size: 1.8rem; font-weight: 600; margin-bottom: 16px; }
    .feature-list { list-style: none; margin: 20px 0; }
    .feature-list li { margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
    .feature-list i { color: var(--accent); }
    .link-gold { color: var(--accent); font-weight: 600; border-bottom: 1px solid transparent; transition: 0.2s; }
    .link-gold:hover { border-bottom-color: var(--accent); }

    /* 场景 */
    #scenarios { background: var(--primary); }
    .scenario-cards { display: flex; gap: 24px; }
    .scenario-card {
      flex: 1;
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-card);
      height: 360px;
      position: relative;
      overflow: hidden;
      transition: 0.3s;
    }

    .scenario-card::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(0,0,0,0.5);
      transition: 0.3s;
    }

    .scenario-card:hover::before { background: rgba(0,0,0,0.65); }
    .scenario-card:hover { transform: scale(1.02); }
    .scenario-content {
      position: relative;
      z-index: 2;
      color: white;
      text-align: center;
      padding: 40px 20px;
      height: 100%;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .scenario-content h3 { font-family: var(--font-serif); font-size: 2rem; margin-bottom: 12px; }

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

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

    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-card-hover);
    }

    .case-img img { width: 100%; height: 200px; object-fit: cover; }
    .case-body { padding: 24px; }
    .case-body h4 { font-weight: 600; margin-bottom: 8px; }
    .case-stat { font-family: var(--font-serif); font-size: 2rem; color: var(--accent); font-weight: 700; }

    /* FAQ */
    .accordion-faq { max-width: 800px; margin: 0 auto; }
    .accordion-item { margin-bottom: 12px; border-radius: var(--radius-card); overflow: hidden; background: var(--muted); }
    .accordion-title {
      background: var(--muted);
      padding: 20px 24px;
      font-weight: 600;
      font-size: 1.1rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-left: 4px solid transparent;
      transition: 0.2s;
    }

    .accordion-title.active { border-left-color: var(--accent); background: #EDEAE4; }
    .accordion-content { padding: 0 24px 20px; display: none; color: var(--text-secondary); }
    .accordion-content.show { display: block; }

    /* CTA */
    #cta {
      background: var(--primary);
      text-align: center;
    }

    #cta h2 { color: white; font-size: 2.5rem; margin-bottom: 16px; }
    #cta .subtitle { color: var(--text-on-dark); margin-bottom: 32px; }
    .btn-white { background: white; color: var(--primary); padding: 14px 36px; border-radius: var(--radius-btn); }
    .btn-white-outline { border: 1.5px solid white; color: white; padding: 14px 36px; border-radius: var(--radius-btn); background: transparent; }
    .btn-white-outline:hover { background: white; color: var(--primary); }

    /* Footer */
    #footer {
      background: var(--secondary);
      color: var(--text-on-dark);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 32px;
    }

    .footer-col h4 { color: white; margin-bottom: 16px; font-weight: 600; }
    .footer-col a, .footer-col p { color: #B0B0B0; font-size: 0.9rem; display: block; margin-bottom: 8px; transition: 0.2s; }
    .footer-col a:hover { color: var(--accent); }
    .social-icons { display: flex; gap: 16px; font-size: 1.4rem; }
    .copyright { border-top: 1px solid rgba(255,255,255,0.1); margin-top: 40px; padding-top: 20px; text-align: center; font-size: 0.85rem; color: #999; }

    @media (max-width: 1024px) {
      .advantages-grid, .service-row { flex-direction: column; }
      .service-row.reverse { flex-direction: column; }
      .service-img { flex: 0 0 auto; width: 100%; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 640px) {
      .nav-links, .hot-tags { display: none; }
      .hamburger { display: block; }
      .hero-content h1 { font-size: 2.4rem; }
      .btn-group { flex-direction: column; align-items: center; }
      .scenario-cards { flex-direction: column; }
      .cases-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .section-padding { padding: 80px 0; }
      .btn-primary, .btn-outline, .btn-white, .btn-white-outline { width: 100%; justify-content: center; }
    }