/* roulang page: index */
:root {
      --deep-bg: #0A0F1E;
      --card-bg: #1A2035;
      --gold: #D4AF37;
      --gold-dark: #B4942F;
      --cyan: #00F0FF;
      --text-primary: #F0F2F5;
      --text-secondary: #B0B8C5;
      --text-muted: #6B7280;
      --glass-bg: rgba(26, 32, 53, 0.6);
      --glass-border: rgba(212, 175, 55, 0.15);
      --shadow-card: 0 20px 40px rgba(0,0,0,0.5);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-mono: 'Space Grotesk', sans-serif;
      --max-width: 1320px;
      --header-height: 80px;
    }

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

    body {
      background-color: var(--deep-bg);
      color: var(--text-primary);
      font-family: var(--font-sans);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all 0.3s ease;
    }

    input {
      font-family: var(--font-sans);
    }

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

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(10, 15, 30, 0.7);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(212, 175, 55, 0.2);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 1.5rem;
      letter-spacing: -0.02em;
      color: var(--text-primary);
      white-space: nowrap;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--gold) 0%, var(--gold-dark) 100%);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--deep-bg);
      font-weight: 800;
      font-size: 1.4rem;
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 8px 0;
      font-size: 0.95rem;
      letter-spacing: 0.3px;
    }

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

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

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

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      z-index: 1001;
    }

    .hamburger span {
      width: 28px;
      height: 2px;
      background: var(--text-primary);
      transition: all 0.3s ease;
    }

    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(10, 15, 30, 0.98);
      backdrop-filter: blur(30px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 3rem;
      transform: translateX(100%);
      transition: transform 0.4s ease;
      z-index: 999;
    }

    .mobile-menu.active {
      transform: translateX(0);
    }

    .mobile-menu a {
      font-size: 1.8rem;
      font-weight: 600;
      color: var(--text-primary);
      letter-spacing: 1px;
    }

    /* 首屏 */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
      padding-top: var(--header-height);
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(10, 15, 30, 0.75);
      backdrop-filter: blur(2px);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .hero h1 {
      font-size: clamp(2.8rem, 7vw, 4.5rem);
      font-weight: 800;
      letter-spacing: -0.02em;
      color: var(--text-primary);
      margin-bottom: 1.5rem;
      line-height: 1.2;
    }

    .hero .subtitle {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 2.5rem;
      max-width: 600px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .btn-primary {
      background: linear-gradient(135deg, var(--gold) 0%, var(--gold-dark) 100%);
      color: var(--deep-bg);
      font-weight: 700;
      padding: 14px 36px;
      border-radius: 40px;
      font-size: 1rem;
      letter-spacing: 0.5px;
      box-shadow: 0 8px 20px rgba(212, 175, 55, 0.25);
    }

    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0, 240, 255, 0.5);
      transform: translateY(-3px);
    }

    .btn-outline {
      border: 1.5px solid var(--gold);
      color: var(--gold);
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 600;
      background: transparent;
    }

    .btn-outline:hover {
      background: rgba(212, 175, 55, 0.1);
      border-color: var(--cyan);
      color: var(--cyan);
      box-shadow: 0 0 15px rgba(0,240,255,0.3);
    }

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

    .section-header {
      text-align: center;
      margin-bottom: 70px;
    }

    .section-header h2 {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 1rem;
      letter-spacing: -0.02em;
    }

    .section-header .gold-line {
      width: 60px;
      height: 3px;
      background: var(--gold);
      margin: 15px auto;
    }

    .section-header p {
      color: var(--text-secondary);
      max-width: 600px;
      margin: 0 auto;
      font-size: 1.1rem;
    }

    /* 玻璃卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      border-color: rgba(212, 175, 55, 0.4);
      box-shadow: 0 0 25px rgba(0, 240, 255, 0.15);
    }

    /* 优势网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .advantage-icon {
      font-size: 2.5rem;
      color: var(--cyan);
      margin-bottom: 20px;
    }

    .glass-card h3 {
      color: var(--gold);
      font-weight: 700;
      margin-bottom: 12px;
    }

    /* 数据面板交错 */
    .stats-row {
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
      justify-content: center;
      margin-top: 40px;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-mono);
      font-size: 3rem;
      font-weight: 600;
      color: var(--cyan);
      line-height: 1.2;
    }

    .stat-label {
      color: var(--text-secondary);
      margin-top: 8px;
    }

    /* 会员图文交错 */
    .feature-row {
      display: flex;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }

    .feature-row.reverse {
      flex-direction: row-reverse;
    }

    .feature-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .feature-text {
      flex: 1;
    }

    .feature-text h3 {
      font-size: 2rem;
      font-weight: 700;
      color: var(--gold);
      margin-bottom: 20px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      overflow: hidden;
    }

    .faq-question {
      padding: 22px 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
    }

    .faq-icon {
      font-size: 1.5rem;
      color: var(--gold);
      transition: transform 0.3s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: rgba(0,0,0,0.2);
      padding: 0 30px;
      color: var(--text-secondary);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 20px 30px;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA 表单 */
    .cta-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: 24px;
      padding: 60px 40px;
      text-align: center;
      max-width: 700px;
      margin: 0 auto;
    }

    .inline-form {
      display: flex;
      gap: 15px;
      margin-top: 30px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .inline-form input {
      background: #0A0F1E;
      border: 1px solid var(--gold);
      padding: 14px 20px;
      border-radius: 40px;
      color: white;
      min-width: 240px;
      outline: none;
    }

    .inline-form input::placeholder {
      color: var(--text-muted);
    }

    /* 页脚 */
    .footer {
      background: #060B18;
      padding: 70px 0 30px;
      border-top: 1px solid rgba(212,175,55,0.1);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    .footer-brand p {
      color: var(--text-muted);
      margin-top: 15px;
    }

    .footer h4 {
      color: var(--text-primary);
      margin-bottom: 20px;
      font-weight: 600;
    }

    .footer a {
      color: var(--text-secondary);
      display: block;
      margin-bottom: 10px;
    }

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

    .copyright {
      text-align: center;
      margin-top: 50px;
      color: var(--text-muted);
      border-top: 1px solid rgba(255,255,255,0.05);
      padding-top: 25px;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .feature-row { flex-direction: column; gap: 30px; }
      .feature-row.reverse { flex-direction: column; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .grid-3 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero h1 { font-size: 2.5rem; }
    }