/* roulang page: index */
/* ----- 设计变量与基础重置 ----- */
    :root {
      --primary-orange: #FF3D2E;
      --primary-orange-dark: #E63520;
      --deep-purple-black: #1A0A2E;
      --darker-bg: #0D0B1E;
      --card-bg: rgba(255,255,255,0.04);
      --card-border: rgba(255,255,255,0.08);
      --electric-purple: #7B2FBE;
      --honor-gold: #C8A45C;
      --text-main: #FFFFFF;
      --text-body: #C4B5D4;
      --text-muted: #7A6B8C;
      --radius-lg: 16px;
      --radius-btn: 50px;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
      --shadow-hover: 0 12px 40px rgba(255,61,46,0.25);
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --font-heading: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --font-number: "DIN Alternate", "Bebas Neue", "PingFang SC", sans-serif;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    html {
      scroll-behavior: smooth;
    }
    
    body {
      font-family: var(--font-body);
      background-color: var(--deep-purple-black);
      background-image: linear-gradient(135deg, #1A0A2E 0%, #0D0B1E 50%, #1A0A2E 100%);
      color: var(--text-body);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    /* 容器 */
    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    
    /* 排版润色 */
    h1, h2, h3 {
      font-family: var(--font-heading);
      color: var(--text-main);
      letter-spacing: -0.3px;
    }
    h1 { font-size: 3rem; font-weight: 700; line-height: 1.2; }
    h2 { font-size: 2.25rem; font-weight: 600; line-height: 1.3; text-align: center; margin-bottom: 0.75rem; }
    .section-subtitle {
      text-align: center;
      color: var(--text-muted);
      font-size: 1.125rem;
      margin-bottom: 3rem;
    }
    .decor-line {
      width: 70px; height: 3px; 
      background: linear-gradient(90deg, var(--primary-orange), var(--electric-purple)); 
      margin: 0 auto 1rem auto; 
    }
    
    /* 导航 */
    #header {
      position: fixed; top: 0; left: 0; width: 100%; z-index: 50;
      padding: 1.2rem 2rem;
      display: flex; align-items: center; justify-content: space-between;
      transition: background 0.3s ease, backdrop-filter 0.3s ease, padding 0.3s ease;
      background: transparent;
    }
    #header.scrolled {
      background: rgba(13, 11, 30, 0.9);
      backdrop-filter: blur(20px);
      box-shadow: 0 1px 0 rgba(255,255,255,0.08);
      padding: 0.8rem 2rem;
    }
    .logo { font-size: 1.8rem; font-weight: 700; color: var(--honest-gold); font-family: var(--font-heading); letter-spacing: 0.5px; }
    .logo span { color: var(--primary-orange); }
    .nav-links { display: flex; gap: 2rem; align-items: center; }
    .nav-links a { color: rgba(255,255,255,0.85); text-decoration: none; font-weight: 500; transition: color 0.2s; font-size: 0.95rem; }
    .nav-links a:hover, .nav-links a.active { color: var(--primary-orange); }
    .btn-primary-sm { background: var(--primary-orange); padding: 0.6rem 1.5rem; border-radius: 50px; color: white!important; font-weight: 600; }
    .btn-outline-sm { border: 1px solid rgba(255,255,255,0.3); padding: 0.6rem 1.5rem; border-radius: 50px; color: white; }
    
    /* 汉堡菜单 */
    .hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
    .hamburger span { display: block; width: 25px; height: 2px; background: white; transition: 0.3s; }
    .mobile-menu { display: none; position: fixed; top: 70px; left: 0; width: 100%; background: rgba(10, 5, 25, 0.97); backdrop-filter: blur(30px); flex-direction: column; padding: 2rem; gap: 1.5rem; }
    
    /* Hero区 */
    #hero {
      min-height: 100vh; display: flex; align-items: center; position: relative;
      background: radial-gradient(circle at 30% 40%, rgba(123,47,190,0.15) 0%, transparent 60%);
    }
    .hero-content { max-width: 700px; }
    .data-badge-row { display: flex; gap: 2rem; margin-top: 2.5rem; flex-wrap: wrap; }
    .badge-item { background: rgba(255,255,255,0.05); backdrop-filter: blur(5px); padding: 1rem 1.8rem; border-radius: 12px; border:1px solid rgba(255,61,46,0.2); }
    .badge-number { font-family: var(--font-number); font-size: 2.4rem; font-weight: 800; background: linear-gradient(to right, #C8A45C, #FF3D2E); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
    
    /* 卡片栅格 */
    .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
    .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .card {
      background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.06);
      border-radius: var(--radius-lg); padding: 2rem; transition: var(--transition-smooth);
      backdrop-filter: blur(8px);
    }
    .card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); border-color: rgba(255,61,46,0.25); }
    .card-icon { font-size: 2.2rem; color: var(--primary-orange); margin-bottom: 1.2rem; }
    
    /* 流程数字 */
    .process-step { display: flex; gap:1.5rem; align-items: flex-start; }
    .step-number { width: 50px; height: 50px; border-radius: 50%; background: linear-gradient(135deg, #FF3D2E, #7B2FBE); display: flex; align-items: center; justify-content: center; font-weight: bold; font-size: 1.5rem; color:white; flex-shrink: 0; }
    
    /* FAQ */
    .faq-item { background: rgba(255,255,255,0.03); border-radius: 12px; margin-bottom: 1rem; overflow: hidden; border: 1px solid rgba(255,255,255,0.05); }
    .faq-question { padding: 1.3rem 2rem; display: flex; justify-content: space-between; font-weight: 600; color: white; cursor: pointer; }
    .faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.3s; background: rgba(255,255,255,0.02); padding: 0 2rem; color: var(--text-body); }
    .faq-item.active .faq-answer { max-height: 200px; padding: 1.2rem 2rem; }
    
    /* CTA区 */
    #cta { background: linear-gradient(45deg, #FF3D2E, #7B2FBE); }
    .btn-main { background: white; color: #1A0A2E; font-weight: 700; padding: 1rem 2.5rem; border-radius: 50px; display: inline-block; transition: 0.2s; }
    .btn-main:hover { background: #f0f0f0; box-shadow: 0 10px 25px rgba(0,0,0,0.3); }
    .btn-secondary { border: 1px solid rgba(255,255,255,0.6); color: white; padding: 1rem 2.5rem; border-radius: 50px; }
    
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2,1fr); }
      .grid-3 { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      h1 { font-size: 2rem; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .grid-4, .grid-3 { grid-template-columns: 1fr; }
      .process-step { flex-direction: column; }
    }