/* roulang page: index */
:root {
      --primary: #0A0E17;
      --accent-green: #00E676;
      --accent-red: #FF1744;
      --bg-light: #F5F5F5;
      --bg-white: #FFFFFF;
      --bg-dark: #0D1117;
      --card-dark: #1A1F2B;
      --text-dark: #333333;
      --text-light: #FFFFFF;
      --text-muted: #9CA3AF;
      --border-light: rgba(255,255,255,0.1);
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-md: 0 12px 30px rgba(0,0,0,0.12);
      --radius-md: 12px;
      --radius-btn: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Inter", "Roboto", sans-serif;
      --transition: 0.25s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      line-height: 1.6;
      color: var(--text-dark);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.2;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, input {
      font-family: inherit;
      font-size: inherit;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: 72px;
      background: rgba(10,14,23,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: none;
      transition: background 0.3s ease;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--text-light);
      letter-spacing: -0.5px;
    }
    .logo span {
      color: var(--accent-green);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      color: var(--text-light);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 0.25rem 0;
      white-space: nowrap;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-green);
      transition: width var(--transition);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-nav {
      background: var(--accent-red);
      color: white !important;
      padding: 0.6rem 1.4rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: transform var(--transition), box-shadow var(--transition);
    }
    .btn-nav:hover {
      transform: scale(1.03);
      box-shadow: 0 0 20px rgba(255,23,68,0.5);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: white;
      transition: var(--transition);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(10,14,23,0.98);
      backdrop-filter: blur(16px);
      padding: 2rem;
      flex-direction: column;
      gap: 1.8rem;
      z-index: 999;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.2rem;
      font-weight: 500;
      display: block;
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 700px;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0A0E17 0%, #1A1F2B 100%);
      position: relative;
      overflow: hidden;
      color: white;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(0,230,118,0.08) 0%, transparent 50%);
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }
    .hero h1 {
      font-size: 3.5rem;
      font-weight: 800;
      margin-bottom: 1.5rem;
      letter-spacing: -1px;
      color: white;
    }
    .hero .subtitle {
      font-size: 1.3rem;
      color: #ccc;
      margin-bottom: 2.5rem;
    }
    .hero-buttons {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-green);
      color: #0A0E17;
      font-weight: 700;
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: all var(--transition);
      display: inline-block;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-green);
      color: var(--accent-green);
      font-weight: 600;
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-btn);
      cursor: pointer;
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: rgba(0,230,118,0.1);
      transform: scale(1.03);
    }
    .live-widget {
      position: absolute;
      right: 40px;
      bottom: 40px;
      background: rgba(26,31,43,0.85);
      backdrop-filter: blur(8px);
      border-radius: 16px;
      padding: 1rem 1.5rem;
      color: white;
      font-size: 0.9rem;
      border: 1px solid rgba(255,255,255,0.15);
      z-index: 3;
    }
    .live-item {
      display: flex;
      justify-content: space-between;
      gap: 1.5rem;
      margin: 0.3rem 0;
    }
    .live-score {
      color: var(--accent-green);
      font-weight: 700;
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 1rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60px;
      height: 3px;
      background: var(--accent-green);
    }
    .bg-dark {
      background: var(--bg-dark);
      color: white;
    }
    .bg-light {
      background: var(--bg-light);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .dark-card {
      background: var(--card-dark);
      border: 1px solid rgba(255,23,68,0.2);
    }

    /* 痛点 */
    .pain-icon {
      font-size: 2.5rem;
      color: var(--accent-red);
      margin-bottom: 1rem;
    }

    /* 解决方案卡片 */
    .solution-icon {
      font-size: 2.8rem;
      color: var(--accent-green);
      margin-bottom: 1rem;
    }

    /* 产品网格 */
    .product-item {
      position: relative;
      border-radius: var(--radius-md);
      overflow: hidden;
      height: 280px;
      background-size: cover;
      background-position: center;
    }
    .product-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      padding: 2rem;
      background: linear-gradient(transparent, rgba(0,0,0,0.8));
      color: white;
    }

    /* 数据数字 */
    .stat-number {
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--accent-green);
    }

    /* 证言 */
    .testimonial-card {
      display: flex;
      align-items: flex-start;
      gap: 1rem;
      background: white;
      padding: 1.5rem;
      border-radius: var(--radius-md);
      border-left: 4px solid var(--accent-green);
    }
    .avatar {
      width: 48px;
      height: 48px;
      background: #ccc;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: white;
      background: var(--accent-red);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #e5e7eb;
      padding: 1.2rem 0;
    }
    .faq-question {
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: #555;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 0.8rem;
    }

    /* CTA */
    .cta-section {
      background: var(--bg-dark);
    }
    .cta-input {
      display: flex;
      gap: 1rem;
      max-width: 500px;
      margin: 2rem auto 0;
    }
    .cta-input input {
      flex: 1;
      padding: 0.9rem;
      border-radius: var(--radius-btn);
      border: none;
      background: rgba(255,255,255,0.15);
      color: white;
    }
    .btn-cta {
      background: var(--accent-red);
      color: white;
      font-weight: 700;
      padding: 0.9rem 2rem;
      border-radius: var(--radius-btn);
      border: none;
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(255,23,68,0.6); }
      70% { box-shadow: 0 0 0 12px rgba(255,23,68,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,23,68,0); }
    }

    footer {
      background: #0A0E17;
      color: #ccc;
      padding: 3rem 0 2rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .grid-3, .grid-2 { grid-template-columns: 1fr; }
      .hero h1 { font-size: 2.4rem; }
      .section-title { font-size: 2rem; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .live-widget { display: none; }
    }