/* roulang page: index */
:root {
      --deep-midnight: #0A1128;
      --midnight-light: #111D3A;
      --champagne-gold: #C9A96E;
      --warm-amber: #E8B44F;
      --text-soft: #D4D9E6;
      --text-muted: #B0B8CC;
      --footer-bg: #060C1A;
      --card-bg: rgba(20, 28, 50, 0.75);
      --border-gold-subtle: rgba(201, 169, 110, 0.25);
      --shadow-gold: 0 8px 32px rgba(201, 169, 110, 0.12);
      --radius-card: 16px;
      --radius-btn: 50px;
      --transition-smooth: all 0.3s ease;
      --font-serif: 'Noto Serif SC', 'Playfair Display', serif;
      --font-sans: 'Noto Sans SC', 'Helvetica Neue', sans-serif;
      --font-mono: 'Fira Code', 'JetBrains Mono', monospace;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-sans);
      background: radial-gradient(circle at 20% 20%, #111D3A, #0A1128 80%);
      color: #E5E9F0;
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
      position: relative;
    }
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 400"><filter id="noise"><feTurbulence type="fractalNoise" baseFrequency="0.65" numOctaves="1" stitchTiles="stitch"/></filter><rect width="100%" height="100%" filter="url(#noise)" opacity="0.03"/></svg>');
      pointer-events: none;
      z-index: 0;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
      position: relative;
      z-index: 1;
    }
    /* 导航栏 */
    #main-nav {
      background: rgba(10, 17, 40, 0.92);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-gold-subtle);
      padding: 0.75rem 0;
      position: fixed;
      width: 100%;
      top: 0;
      z-index: 99;
      transition: var(--transition-smooth);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }
    .logo-brand {
      display: flex;
      align-items: baseline;
      gap: 0.35rem;
      text-decoration: none;
    }
    .logo-main {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 2px;
      background: linear-gradient(135deg, #C9A96E 0%, #F5E7C6 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .logo-sub {
      font-size: 0.7rem;
      color: var(--champagne-gold);
      font-weight: 300;
      letter-spacing: 0.5px;
      margin-left: 4px;
      font-family: 'Playfair Display', serif;
      font-style: italic;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
      list-style: none;
      margin: 0;
    }
    .nav-links a {
      color: var(--text-soft);
      text-decoration: none;
      font-size: 0.9rem;
      font-weight: 400;
      letter-spacing: 0.3px;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--champagne-gold);
    }
    .btn-nav {
      background: transparent;
      border: 1px solid var(--champagne-gold);
      color: var(--champagne-gold);
      padding: 0.5rem 1.5rem;
      border-radius: var(--radius-btn);
      font-size: 0.9rem;
      font-weight: 500;
      transition: var(--transition-smooth);
      text-decoration: none;
      display: inline-block;
    }
    .btn-nav:hover {
      background: rgba(201, 169, 110, 0.12);
      color: #fff;
    }
    .title-bar {
      background: transparent;
      padding: 0;
    }
    .menu-icon {
      color: var(--champagne-gold);
    }
    .menu-icon::after {
      background: var(--champagne-gold);
      box-shadow: 0 7px 0 var(--champagne-gold), 0 14px 0 var(--champagne-gold);
    }
    @media screen and (max-width: 1024px) {
      .nav-links {
        gap: 1.2rem;
      }
    }
    @media screen and (max-width: 640px) {
      .nav-container {
        flex-direction: column;
        align-items: flex-start;
      }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
      position: relative;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }
    h2 {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 2.4rem;
      letter-spacing: 0.05em;
      color: var(--champagne-gold);
      margin-bottom: 2.5rem;
      text-align: center;
    }
    h3 {
      font-family: var(--font-sans);
      font-weight: 600;
      color: #F0E5D8;
    }
    .btn-primary {
      background: linear-gradient(135deg, #C9A96E, #E8B44F);
      border: none;
      color: #0A1128;
      font-weight: 700;
      padding: 0.9rem 2.5rem;
      border-radius: var(--radius-btn);
      font-size: 1rem;
      letter-spacing: 0.8px;
      text-decoration: none;
      display: inline-block;
      transition: var(--transition-smooth);
      box-shadow: 0 4px 12px rgba(232,180,79,0.3);
    }
    .btn-primary:hover {
      box-shadow: 0 0 24px rgba(232,180,79,0.7);
      transform: scale(1.03);
      color: #0A1128;
    }
    .card-glass {
      background: var(--card-bg);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid var(--border-gold-subtle);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-gold);
      transition: var(--transition-smooth);
    }
    .card-glass:hover {
      box-shadow: 0 12px 40px rgba(201,169,110,0.25);
      border-color: rgba(201,169,110,0.5);
    }
    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(ellipse at 30% 40%, #1A2545 0%, #0A1128 70%);
      position: relative;
      overflow: hidden;
    }
    .hero-geo {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800"><path d="M0 400 L1200 200" stroke="%23C9A96E" stroke-width="0.5" fill="none" opacity="0.25"/><path d="M0 600 L1200 500" stroke="%23E8B44F" stroke-width="0.3" fill="none" opacity="0.2"/><circle cx="800" cy="300" r="150" stroke="%23C9A96E" stroke-width="0.6" fill="none" opacity="0.15"/></svg>');
      background-size: cover;
      pointer-events: none;
    }
    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 3rem;
      flex-wrap: wrap;
      position: relative;
      z-index: 2;
    }
    .hero-left h1 {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: clamp(2.5rem, 5vw, 4.2rem);
      background: linear-gradient(to right, #E8C576, #F5E7C6, #C9A96E);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      line-height: 1.3;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: #B0B8CC;
      margin: 1.5rem 0 2rem;
    }
    .hero-right .stat-card {
      background: rgba(20,28,50,0.8);
      backdrop-filter: blur(12px);
      border: 1px solid #C9A96E50;
      border-radius: 20px;
      padding: 2rem;
      display: flex;
      flex-direction: column;
      gap: 1.8rem;
    }
    .stat-item .count {
      font-family: var(--font-mono);
      font-size: 2.2rem;
      font-weight: 500;
      color: var(--warm-amber);
    }
    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
    }
    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .metric-digit {
      font-family: var(--font-mono);
      font-size: 3rem;
      color: var(--warm-amber);
      font-weight: 500;
    }
    @media (max-width: 768px) {
      .metrics-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
    }
    .service-card.first-highlight {
      border-left: 3px solid var(--champagne-gold);
    }
    .service-card i {
      color: var(--champagne-gold);
      font-size: 2rem;
      margin-bottom: 1rem;
    }
    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 对比 */
    .comparison-pair {
      display: flex;
      gap: 2rem;
      flex-wrap: wrap;
    }
    .compare-card {
      flex: 1;
      min-width: 280px;
    }
    .compare-card.left {
      background: rgba(30,35,50,0.7);
      border-color: #4A5568;
    }
    .compare-card.right {
      border-color: var(--champagne-gold);
      box-shadow: 0 0 18px rgba(232,180,79,0.25);
    }
    .check-gold {
      color: var(--warm-amber);
    }
    /* FAQ */
    .accordion-title {
      font-family: var(--font-sans);
      font-weight: 600;
      color: #F0E5D8;
      background: transparent;
      border-bottom: 1px solid rgba(201,169,110,0.4);
    }
    .accordion-item.is-active .accordion-title {
      background: rgba(201,169,110,0.08);
      border-bottom-color: var(--champagne-gold);
    }
    /* CTA 表单 */
    #contact {
      background: #0A1128;
      background-image: radial-gradient(circle at 30% 30%, #C9A96E10 0%, transparent 50%);
    }
    .contact-form input, .contact-form textarea {
      background: #0F1A2F;
      border: 1px solid #C9A96E60;
      color: white;
      border-radius: 12px;
      padding: 0.8rem;
    }
    .contact-form input:focus {
      border-color: var(--warm-amber);
      box-shadow: 0 0 8px #E8B44F;
    }
    /* 页脚 */
    #footer {
      background: #060C1A;
      color: #8890A4;
    }
    .footer-links a {
      color: #B0B8CC;
      text-decoration: none;
    }
    .footer-links a:hover {
      color: var(--champagne-gold);
    }
    img {
      max-width: 100%;
      height: auto;
    }