/* roulang page: index */
:root {
      --primary: #0A84FF;
      --primary-dark: #0066CC;
      --accent: #00D4AA;
      --bg-deep: #0B0E14;
      --bg-card: #141A24;
      --glass-bg: rgba(20, 26, 36, 0.7);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-hover-border: rgba(10, 132, 255, 0.4);
      --text-primary: #FFFFFF;
      --text-body: #B0B8C5;
      --text-muted: #6B7385;
      --text-highlight: #0A84FF;
      --star-gold: #FFB800;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
      --shadow-hover: 0 12px 40px rgba(10, 132, 255, 0.2);
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-pill: 50px;
      --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-mono: 'DIN Alternate', 'Inter', 'SF Pro Display', system-ui, sans-serif;
      --container-max: 1280px;
      --nav-height: 72px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4 {
      color: var(--text-primary);
      font-weight: 700;
    }
    
    h1 {
      font-size: clamp(2.5rem, 5vw, 4rem);
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.02em;
    }
    
    h2 {
      font-size: clamp(2rem, 4vw, 2.8rem);
      line-height: 1.3;
      margin-bottom: 1rem;
    }
    
    h3 {
      font-size: 1.5rem;
      font-weight: 600;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 2rem;
    }
    
    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-pill);
      transition: var(--transition-smooth);
      cursor: pointer;
      border: none;
      text-align: center;
      white-space: nowrap;
    }
    
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #FFFFFF;
      padding: 1rem 2.5rem;
      box-shadow: 0 0 20px rgba(10, 132, 255, 0.5), 0 4px 12px rgba(10, 132, 255, 0.3);
      font-size: 1rem;
    }
    
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(10, 132, 255, 0.8), 0 6px 20px rgba(10, 132, 255, 0.5);
      transform: scale(1.05);
    }
    
    .btn-ghost {
      background: transparent;
      border: 2px solid rgba(10, 132, 255, 0.6);
      color: var(--primary);
      padding: 0.95rem 2.5rem;
    }
    
    .btn-ghost:hover {
      background: rgba(10, 132, 255, 0.1);
      border-color: var(--primary);
    }
    
    .btn-large {
      font-size: 1.25rem;
      padding: 1.2rem 3rem;
      animation: glowPulse 2s infinite;
    }
    
    @keyframes glowPulse {
      0% { box-shadow: 0 0 20px rgba(10, 132, 255, 0.5), 0 4px 12px rgba(10, 132, 255, 0.3); }
      50% { box-shadow: 0 0 35px rgba(10, 132, 255, 0.8), 0 6px 20px rgba(10, 132, 255, 0.6); }
      100% { box-shadow: 0 0 20px rgba(10, 132, 255, 0.5), 0 4px 12px rgba(10, 132, 255, 0.3); }
    }
    
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(11, 14, 20, 0.8);
      backdrop-filter: blur(20px) saturate(180%);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    
    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: #FFFFFF;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    
    .logo i {
      color: var(--primary);
      font-size: 1.8rem;
    }
    
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    
    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      position: relative;
      padding: 0.5rem 0;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.3s ease, left 0.3s ease;
    }
    
    .nav-links a:hover {
      color: #FFFFFF;
    }
    
    .nav-links a:hover::after {
      width: 100%;
      left: 0;
    }
    
    .nav-cta {
      background: var(--primary);
      color: #fff;
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-pill);
      font-weight: 600;
      box-shadow: 0 0 15px rgba(10,132,255,0.4);
    }
    
    .nav-cta:hover {
      background: #0066CC;
    }
    
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: #fff;
      cursor: pointer;
    }
    
    /* 区块间距 */
    section {
      padding: 6rem 0;
    }
    
    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, rgba(10,132,255,0.15) 0%, transparent 60%);
      position: relative;
      overflow: hidden;
    }
    
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    
    .hero-content h1 {
      margin-bottom: 1.5rem;
    }
    
    .hero-content p {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 2rem;
    }
    
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    
    .hero-mockup {
      position: relative;
      display: flex;
      justify-content: center;
    }
    
    .mockup-frame {
      background: rgba(20,26,36,0.6);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 32px;
      padding: 12px;
      box-shadow: 0 20px 50px rgba(0,0,0,0.5);
      max-width: 320px;
    }
    
    .mockup-screen {
      background: #1a1f2b;
      border-radius: 24px;
      overflow: hidden;
    }
    
    /* 玻璃卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px) saturate(180%);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }
    
    .glass-card:hover {
      transform: translateY(-6px);
      border-color: var(--glass-hover-border);
      box-shadow: var(--shadow-hover);
    }
    
    .light-glass {
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255,255,255,0.1);
    }
    
    /* 网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
    }
    
    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }
    
    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(10,132,255,0.15);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 1.5rem;
      margin-bottom: 1.5rem;
    }
    
    .metric {
      font-family: var(--font-mono);
      font-weight: 700;
      color: var(--accent);
    }
    
    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      align-items: center;
      position: relative;
    }
    
    .step-item {
      text-align: center;
      flex: 1;
    }
    
    .step-icon {
      width: 64px;
      height: 64px;
      background: var(--glass-bg);
      backdrop-filter: blur(10px);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1rem;
      font-size: 1.8rem;
      color: var(--primary);
      border: 1px solid var(--glass-border);
    }
    
    /* FAQ */
    .faq-item {
      background: rgba(20, 26, 36, 0.6);
      border-radius: var(--radius-sm);
      margin-bottom: 1rem;
      overflow: hidden;
      transition: var(--transition-smooth);
    }
    
    .faq-question {
      padding: 1.2rem 1.5rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: #fff;
      cursor: pointer;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 1.5rem;
      color: var(--text-body);
    }
    
    .faq-item.active .faq-answer {
      max-height: 150px;
      padding: 1rem 1.5rem 1.5rem;
      border-left: 3px solid var(--primary);
    }
    
    /* 页脚 */
    footer {
      background: #0A0E14;
      border-top: 1px solid rgba(255,255,255,0.06);
      padding: 3rem 0 1.5rem;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    
    @media (max-width: 1024px) {
      .grid-3, .grid-4 { grid-template-columns: repeat(2,1fr); }
      .hero-grid { grid-template-columns: 1fr; }
      .hero-mockup { order: -1; }
    }
    
    @media (max-width: 768px) {
      .container { padding: 0 1rem; }
      section { padding: 4rem 0; }
      .grid-3, .grid-4, .footer-grid { grid-template-columns: 1fr; }
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-buttons .btn { width: 100%; }
      .steps { flex-direction: column; gap: 2rem; }
    }
    
    .mobile-menu {
      position: fixed;
      top: 0; left: 0; width: 100%; height: 100%;
      background: rgba(11,14,20,0.98);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2rem;
      z-index: 999;
      transform: translateX(100%);
      transition: transform 0.4s ease;
    }
    .mobile-menu.open { transform: translateX(0); }
    .mobile-menu a { font-size: 1.5rem; color: #fff; }