/* roulang page: index */
:root {
      --signal-cyan: #00E5A0;
      --signal-cyan-hover: #33EAB3;
      --deep-charcoal: #1E1E1E;
      --warm-white: #F5F5F7;
      --pure-white: #FFFFFF;
      --dark-gray-blue: #2A2F3A;
      --text-primary: #1E1E1E;
      --text-secondary: #555555;
      --text-light: #F5F5F7;
      --border-subtle: rgba(0,0,0,0.06);
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --radius-card: 16px;
      --radius-button: 40px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: "Inter", "SF Pro Display", system-ui, -apple-system, sans-serif;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4 {
      font-weight: 600;
      letter-spacing: -0.02em;
    }
    
    .section-padding {
      padding: 120px 0;
    }
    
    @media (max-width: 768px) {
      .section-padding {
        padding: 80px 0;
      }
    }
    
    /* 自定义容器 */
    .custom-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航样式 */
    .navbar {
      transition: all 0.4s ease;
      padding: 16px 0;
      z-index: 1030;
    }
    .navbar-transparent {
      background: transparent;
    }
    .navbar-scrolled {
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(20px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }
    .navbar .navbar-brand {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 1.8rem;
      color: white;
      letter-spacing: -0.5px;
      transition: color 0.3s;
    }
    .navbar-scrolled .navbar-brand {
      color: var(--deep-charcoal);
    }
    .navbar .nav-link {
      color: rgba(255,255,255,0.9) !important;
      font-weight: 500;
      margin: 0 8px;
      transition: 0.3s;
      font-size: 1rem;
    }
    .navbar-scrolled .nav-link {
      color: var(--deep-charcoal) !important;
    }
    .nav-link:hover {
      color: var(--signal-cyan) !important;
    }
    .btn-nav-cta {
      background: var(--signal-cyan);
      color: var(--deep-charcoal) !important;
      font-weight: 600;
      border-radius: var(--radius-button);
      padding: 10px 28px;
      margin-left: 16px;
      transition: var(--transition-smooth);
      border: none;
      font-size: 1rem;
      white-space: nowrap;
    }
    .btn-nav-cta:hover {
      background: var(--signal-cyan-hover);
      transform: scale(1.02);
      box-shadow: 0 8px 20px rgba(0,229,160,0.3);
    }
    .navbar-toggler {
      border: none;
      color: white;
    }
    .navbar-scrolled .navbar-toggler {
      color: var(--deep-charcoal);
    }
    
    /* Hero */
    .hero-section {
      height: 100vh;
      background: var(--deep-charcoal);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      display: flex;
      align-items: center;
      color: white;
    }
    .hero-overlay {
      position: absolute;
      top:0; left:0; width:100%; height:100%;
      background: radial-gradient(circle at 10% 30%, rgba(0,229,160,0.08) 0%, rgba(30,30,30,0.7) 80%);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      color: white;
    }
    .hero-sub {
      font-size: 1.3rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2.5rem;
    }
    .btn-primary-custom {
      background: var(--signal-cyan);
      color: var(--deep-charcoal);
      font-weight: 600;
      border-radius: var(--radius-button);
      padding: 14px 36px;
      border: none;
      transition: var(--transition-smooth);
      margin-right: 16px;
    }
    .btn-primary-custom:hover {
      background: var(--signal-cyan-hover);
      transform: scale(1.02);
      box-shadow: 0 10px 24px rgba(0,229,160,0.4);
    }
    .btn-outline-custom {
      border: 2px solid var(--signal-cyan);
      color: var(--signal-cyan);
      background: transparent;
      font-weight: 600;
      border-radius: var(--radius-button);
      padding: 14px 36px;
      transition: var(--transition-smooth);
    }
    .btn-outline-custom:hover {
      background: rgba(0,229,160,0.15);
      transform: scale(1.02);
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: white;
      font-size: 1.8rem;
      animation: bounce 2s infinite;
      z-index: 2;
    }
    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
      40% { transform: translateX(-50%) translateY(-12px); }
      60% { transform: translateX(-50%) translateY(-5px); }
    }
    
    /* 痛点区 */
    .pain-point-img {
      border-radius: 24px;
      box-shadow: var(--shadow-sm);
      width: 100%;
      height: auto;
    }
    
    /* 卡片通用 */
    .custom-card {
      background: var(--pure-white);
      border: none;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
      height: 100%;
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .icon-cyan {
      color: var(--signal-cyan);
      font-size: 2.2rem;
      margin-bottom: 1.2rem;
    }
    
    /* 方案错落栅格 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .solution-card-wide {
      grid-column: span 1;
    }
    .solution-card-center {
      grid-column: 1 / -1;
      max-width: 600px;
      margin: 0 auto;
    }
    @media (max-width: 768px) {
      .solution-grid {
        grid-template-columns: 1fr;
      }
      .solution-card-center {
        max-width: 100%;
      }
    }
    
    /* 数据区块 */
    .stats-section {
      background: var(--deep-charcoal);
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 3rem;
      font-weight: 700;
      color: var(--signal-cyan);
    }
    .stat-label {
      color: rgba(255,255,255,0.85);
      font-size: 1rem;
      margin-top: 8px;
    }
    
    /* 证言卡片 */
    .testimonial-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      display: flex;
      align-items: flex-start;
      gap: 20px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
    }
    .testimonial-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .avatar-img {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      object-fit: cover;
    }
    
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--deep-charcoal);
      box-shadow: none;
      border-left: 3px solid var(--signal-cyan);
    }
    .accordion-button {
      font-weight: 600;
      font-size: 1.1rem;
      border-left: 3px solid transparent;
      transition: 0.2s;
    }
    .accordion-item {
      border: none;
      background: white;
      border-radius: 12px !important;
      margin-bottom: 8px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    
    /* CTA区块 */
    .cta-full {
      background: var(--signal-cyan);
      position: relative;
      overflow: hidden;
    }
    .cta-full::before {
      content: '';
      position: absolute;
      top:0; left:0; width:100%; height:100%;
      background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%231e1e1e' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    }
    .btn-dark-custom {
      background: var(--deep-charcoal);
      color: white;
      font-weight: 600;
      border-radius: var(--radius-button);
      padding: 16px 42px;
      border: none;
      transition: var(--transition-smooth);
    }
    .btn-dark-custom:hover {
      background: #333;
      color: var(--signal-cyan);
      transform: scale(1.02);
    }
    
    /* Footer */
    .footer-brand {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 1.6rem;
    }
    .footer-link {
      color: rgba(255,255,255,0.7);
      text-decoration: none;
      transition: 0.2s;
    }
    .footer-link:hover {
      color: var(--signal-cyan);
    }
    
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .hero-sub {
        font-size: 1.1rem;
      }
    }