/* roulang page: index */
/* ----- 设计变量 & 基础重置 ----- */
    :root {
      --deep-space: #0D0614;
      --dark-purple: #1A0A2E;
      --star-glow: #D4AFFF;
      --star-bright: #E8CFFF;
      --warm-amber: #FFB347;
      --cta-end: #FF7B9C;
      --text-primary: #F0E6FF;
      --text-secondary: #A89BC2;
      --border-light: rgba(212, 175, 255, 0.25);
      --border-strong: rgba(212, 175, 255, 0.4);
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-blur: blur(12px);
      --card-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
      --card-hover-shadow: 0 8px 32px rgba(212, 175, 255, 0.15);
      --radius-lg: 16px;
      --radius-md: 10px;
      --radius-sm: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", "SF Pro Display", sans-serif;
    }

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

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

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease, border-color 0.25s ease;
    }

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: transparent;
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    /* 主按钮发光效果 */
    .btn-primary {
      background: linear-gradient(135deg, var(--warm-amber), var(--cta-end));
      color: #1A0A2E;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 30px;
      box-shadow: 0 0 18px rgba(255, 179, 71, 0.5);
      letter-spacing: 0.5px;
      font-size: 1rem;
      border: none;
    }

    .btn-primary:hover {
      background: linear-gradient(180deg, var(--warm-amber), var(--cta-end));
      box-shadow: 0 0 24px rgba(255, 179, 71, 0.7);
      transform: scale(1.03);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--star-glow);
      color: var(--star-glow);
      padding: 14px 32px;
      border-radius: 30px;
      font-weight: 500;
      font-size: 1rem;
    }

    .btn-outline:hover {
      background: rgba(212, 175, 255, 0.1);
      border-color: var(--warm-amber);
      color: var(--warm-amber);
    }

    /* 焦点可见样式 */
    a:focus-visible, button:focus-visible, .btn:focus-visible {
      outline: none;
      box-shadow: 0 0 0 2px var(--warm-amber);
      border-radius: 4px;
    }

    h1, h2, h3, h4 {
      font-weight: 600;
    }

    h1 {
      font-size: 32px;
      font-weight: 700;
      line-height: 1.3;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 26px;
      line-height: 1.35;
    }

    h3 {
      font-size: 20px;
    }

    .text-small {
      font-size: 12px;
      font-weight: 500;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      color: var(--text-secondary);
    }

    /* ----- 导航区 ----- */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(13, 6, 20, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(212, 175, 255, 0.15);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--text-primary);
      letter-spacing: 1px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: radial-gradient(circle, var(--star-bright), transparent 70%);
      border-radius: 50%;
      box-shadow: 0 0 12px var(--star-glow);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .nav-item {
      position: relative;
      padding: 8px 16px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-secondary);
      border-radius: 30px;
      transition: 0.2s;
    }

    .nav-item:hover {
      color: var(--warm-amber);
    }

    /* Mega Menu 面板 */
    .mega-trigger {
      cursor: pointer;
    }

    .mega-panel {
      position: absolute;
      top: 100%;
      left: 0;
      width: 320px;
      background: rgba(26, 10, 46, 0.95);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 20px;
      display: none;
      flex-direction: row;
      gap: 20px;
      box-shadow: 0 12px 28px rgba(0,0,0,0.6);
      z-index: 1001;
    }

    .nav-item:hover .mega-panel {
      display: flex;
    }

    .mega-links {
      display: flex;
      flex-direction: column;
      gap: 12px;
      flex: 1;
    }

    .mega-link {
      color: var(--text-primary);
      font-size: 14px;
      transition: 0.2s;
      padding: 4px 0;
      border-bottom: 1px solid transparent;
    }

    .mega-link:hover {
      color: var(--warm-amber);
      transform: translateX(4px);
    }

    .mega-card {
      width: 140px;
      height: 90px;
      border-radius: var(--radius-sm);
      overflow: hidden;
      position: relative;
      flex-shrink: 0;
    }

    .mega-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .mega-card::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(to top, rgba(13,6,20,0.7), transparent);
    }

    .mobile-menu-toggle {
      display: none;
      font-size: 1.6rem;
      color: var(--text-primary);
      background: none;
      border: none;
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(13,6,20,0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        border-bottom: 1px solid var(--border-light);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .mega-panel {
        position: static;
        width: 100%;
        background: transparent;
        border: none;
        padding: 0 0 0 16px;
        display: none;
        flex-direction: column;
      }
      .nav-item:hover .mega-panel {
        display: flex;
      }
      .mega-card {
        display: none;
      }
    }

    /* ----- Hero 首屏 ----- */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-blend-mode: overlay;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 30%, rgba(26,10,46,0.4) 0%, #0D0614 90%);
    }

    .hero-content {
      position: relative;
      max-width: 600px;
      text-align: left;
      z-index: 2;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      margin-top: 32px;
      flex-wrap: wrap;
    }

    .floating-stars {
      position: absolute;
      top: 20%;
      right: 15%;
      width: 4px;
      height: 4px;
      background: var(--star-bright);
      border-radius: 50%;
      box-shadow: 0 0 6px var(--star-bright);
      animation: float 4s infinite ease-in-out;
    }

    .star2 { top: 50%; right: 25%; animation-duration: 5s; width: 3px; height: 3px; }
    .star3 { top: 70%; right: 10%; animation-duration: 3.5s; }

    @keyframes float {
      0% { transform: translateY(0); opacity: 0.8; }
      50% { transform: translateY(-15px); opacity: 1; }
      100% { transform: translateY(0); opacity: 0.8; }
    }

    /* ----- 通用区块间距 ----- */
    section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      h1 { font-size: 26px; }
      h2 { font-size: 22px; }
    }

    /* 卡片玻璃效果 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      transition: all 0.25s ease;
    }

    .glass-card:hover {
      transform: translateY(-4px);
      border-color: var(--star-glow);
      box-shadow: var(--card-hover-shadow);
    }

    /* 流程步骤 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 12px;
      position: relative;
    }

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

    .step-circle {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      border: 2px dashed var(--star-glow);
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-size: 24px;
      font-weight: 700;
      color: var(--star-glow);
      background: transparent;
    }

    .step-item.active .step-circle {
      background: linear-gradient(135deg, var(--star-bright), var(--warm-amber));
      border: none;
      color: #1A0A2E;
    }

    .step-connector {
      position: absolute;
      top: 28px;
      left: 50%;
      width: 100%;
      height: 2px;
      border-top: 2px dashed var(--border-light);
      z-index: -1;
    }

    @media (max-width: 768px) {
      .process-steps {
        flex-direction: column;
        align-items: center;
      }
      .step-connector {
        display: none;
      }
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
    }
    .faq-icon {
      font-size: 20px;
      color: var(--star-glow);
      transition: transform 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding-left: 16px;
      margin-top: 0;
      border-left: 3px solid var(--warm-amber);
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      margin-top: 12px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 页脚 */
    #footer {
      background: #0D0614;
      border-top: 1px solid rgba(212,175,255,0.2);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 480px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }