/* roulang page: index */
/* ----- 设计系统变量 ----- */
    :root {
      --primary-cyan: #00F0FF;
      --deep-blue: #0A1128;
      --accent-pink: #FF3366;
      --white: #FFFFFF;
      --text-body: #E0E6ED;
      --text-muted: #8892A4;
      --glass-bg: rgba(255, 255, 255, 0.05);
      --glass-border: rgba(0, 240, 255, 0.15);
      --glass-border-hover: rgba(0, 240, 255, 0.4);
      --card-shadow: 0 4px 20px rgba(0,0,0,0.3);
      --card-hover-shadow: 0 12px 32px rgba(0,240,255,0.15);
      --btn-glow: 0 0 15px rgba(0,240,255,0.5);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --font-sans: 'Inter', 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      --transition-smooth: all 0.3s ease;
      --container-max: 1280px;
    }
    
    /* ----- 全局重置与基础 ----- */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    html {
      scroll-behavior: smooth;
      background-color: var(--deep-blue);
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--deep-blue);
      color: var(--text-body);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
      min-height: 100vh;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      font-weight: 600;
      border: none;
      background: none;
      transition: var(--transition-smooth);
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    
    /* 背景光效与氛围 */
    .bg-glow {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 20%, rgba(0,240,255,0.08) 0%, transparent 50%);
      pointer-events: none;
      z-index: 0;
    }
    
    /* ----- 导航 (沉浸式顶部 + 移动端底部胶囊) ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(10, 17, 40, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0,240,255,0.15);
      transition: var(--transition-smooth);
    }
    
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.01em;
      color: var(--white);
    }
    
    .logo-icon {
      font-size: 2rem;
      color: var(--primary-cyan);
      filter: drop-shadow(0 0 6px rgba(0,240,255,0.6));
    }
    
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    
    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 6px 0;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-cyan);
      transition: width 0.25s ease;
    }
    
    .nav-links a:hover {
      color: var(--primary-cyan);
    }
    
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .mobile-nav {
      display: none;
    }
    
    /* 移动端底部导航 */
    @media (max-width: 768px) {
      .site-header {
        top: auto;
        bottom: 0;
        background: rgba(10, 17, 40, 0.9);
        backdrop-filter: blur(20px);
        border-top: 1px solid rgba(0,240,255,0.2);
        border-bottom: none;
      }
      .header-inner {
        height: 64px;
      }
      .desktop-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
        width: 100%;
        justify-content: space-around;
        align-items: center;
      }
      .mobile-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        color: var(--text-muted);
        font-size: 0.7rem;
        gap: 4px;
      }
      .mobile-nav a i {
        font-size: 1.2rem;
      }
      .mobile-nav a.active, .mobile-nav a:hover {
        color: var(--primary-cyan);
      }
      .logo {
        font-size: 1.2rem;
      }
      .logo-icon {
        font-size: 1.5rem;
      }
    }
    
    /* ----- 首屏 Hero ----- */
    .hero {
      position: relative;
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      background-color: rgba(10,17,40,0.75);
      margin-top: 0;
      padding-top: 80px;
      z-index: 2;
    }
    
    .hero-content {
      max-width: 700px;
      position: relative;
      z-index: 5;
    }
    
    .hero h1 {
      font-size: clamp(2.8rem, 6vw, 4.8rem);
      font-weight: 700;
      line-height: 1.15;
      letter-spacing: -0.02em;
      color: var(--white);
      margin-bottom: 1.5rem;
      text-shadow: 0 0 20px rgba(0,240,255,0.3);
    }
    
    .hero h1 span {
      color: var(--primary-cyan);
    }
    
    .hero-subtitle {
      font-size: 1.3rem;
      color: var(--text-body);
      margin-bottom: 2.5rem;
      max-width: 550px;
    }
    
    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }
    
    .btn-primary {
      background: var(--primary-cyan);
      color: var(--deep-blue);
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 1rem;
      letter-spacing: 0.5px;
      box-shadow: var(--btn-glow);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: 1px solid transparent;
    }
    
    .btn-primary:hover {
      background: #33f5ff;
      box-shadow: 0 0 25px rgba(0,240,255,0.8);
      transform: translateY(-2px);
    }
    
    .btn-glass {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(0,240,255,0.3);
      color: var(--white);
      padding: 14px 32px;
      border-radius: 40px;
      font-weight: 600;
    }
    
    .btn-glass:hover {
      border-color: var(--primary-cyan);
      background: rgba(0,240,255,0.1);
      transform: translateY(-2px);
    }
    
    /* 板块通用 */
    .section {
      padding: 100px 0;
      position: relative;
      z-index: 3;
    }
    
    .section-title {
      font-size: 2.5rem;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--white);
      text-align: center;
    }
    
    .section-title span {
      color: var(--primary-cyan);
      border-bottom: 2px solid var(--primary-cyan);
    }
    
    .section-desc {
      color: var(--text-muted);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 48px;
      font-size: 1.1rem;
    }
    
    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    .pain-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      border-left: 4px solid var(--accent-pink);
      transition: var(--transition-smooth);
    }
    
    .pain-card:hover {
      border-color: var(--primary-cyan);
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-6px);
    }
    
    /* 解决方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    
    .solution-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 40px 24px;
      text-align: center;
      transition: var(--transition-smooth);
    }
    
    .solution-card i {
      font-size: 2.5rem;
      color: var(--primary-cyan);
      margin-bottom: 20px;
    }
    
    .solution-card:hover {
      border-color: var(--primary-cyan);
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-5px);
    }
    
    /* 数据展示 */
    .stats-bar {
      display: flex;
      justify-content: center;
      gap: 48px;
      background: rgba(0,240,255,0.05);
      backdrop-filter: blur(10px);
      border: 1px solid var(--glass-border);
      border-radius: 60px;
      padding: 32px 48px;
      flex-wrap: wrap;
    }
    
    .stat-item h3 {
      font-size: 2.5rem;
      color: var(--primary-cyan);
      font-weight: 700;
    }
    
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 28px;
    }
    
    .testimonial-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-md);
      padding: 32px;
      border: 1px solid var(--glass-border);
    }
    
    /* FAQ */
    .faq-item {
      background: rgba(255,255,255,0.03);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-sm);
      margin-bottom: 16px;
      transition: var(--transition-smooth);
    }
    
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--white);
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 24px;
      color: var(--text-muted);
    }
    
    .faq-item.active {
      border-color: var(--primary-cyan);
      background: rgba(0,240,255,0.05);
    }
    
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    
    /* CTA */
    .cta-section {
      background: rgba(10,17,40,0.9);
      backdrop-filter: blur(12px);
      text-align: center;
    }
    
    /* 页脚 */
    .footer {
      text-align: center;
      padding: 40px 0;
      color: var(--text-muted);
      border-top: 1px solid rgba(255,255,255,0.05);
    }
    
    @media (max-width: 1024px) {
      .pain-grid, .solution-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }
    
    @media (max-width: 768px) {
      .pain-grid, .solution-grid, .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .hero {
        padding-top: 60px;
      }
      .section {
        padding: 70px 0;
      }
      .stats-bar {
        flex-direction: column;
        gap: 24px;
        text-align: center;
        border-radius: 32px;
      }
      .btn-primary, .btn-glass {
        width: 100%;
        justify-content: center;
      }
    }