/* roulang page: index */
:root {
      --primary: #1A1A1A;
      --secondary: #00C9A7;
      --accent: #FF6B35;
      --bg-light: #F9FAFB;
      --white: #FFFFFF;
      --text-body: #4B5563;
      --text-weak: #6B7280;
      --border-light: rgba(0,0,0,0.04);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 32px rgba(0,201,167,0.12);
      --radius-lg: 20px;
      --radius-md: 12px;
      --radius-sm: 6px;
      --radius-pill: 50px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-mono: 'Inter', 'SF Mono', 'Segoe UI', monospace;
      --max-width: 1280px;
      --header-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-title);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-title);
      font-weight: 600;
      transition: all 0.25s ease;
      border: none;
      outline: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(26,26,26,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      height: var(--header-height);
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      background: linear-gradient(135deg, #00C9A7 0%, #ffffff 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 0.5px;
    }
    .logo-icon {
      font-size: 2rem;
      filter: drop-shadow(0 0 6px #00C9A7);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 2rem;
      list-style: none;
    }
    .nav-menu a {
      color: #e5e7eb;
      font-weight: 500;
      transition: 0.2s;
      position: relative;
      padding-bottom: 6px;
      font-size: 0.95rem;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--secondary);
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--secondary);
      transition: width 0.25s;
    }
    .nav-menu a:hover::after,
    .nav-menu a.active::after {
      width: 100%;
    }
    .btn-primary {
      background: linear-gradient(135deg, #00C9A7 0%, #1A1A1A 100%);
      color: white;
      border-radius: var(--radius-pill);
      padding: 10px 24px;
      font-size: 0.9rem;
      box-shadow: 0 4px 12px rgba(0,201,167,0.25);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(0,201,167,0.4);
    }
    .btn-outline {
      border: 1.5px solid var(--primary);
      background: transparent;
      color: var(--primary);
      border-radius: var(--radius-pill);
      padding: 10px 24px;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }
    .btn-accent {
      background: linear-gradient(135deg, #FF6B35 0%, #FF8C42 100%);
      color: white;
      border-radius: var(--radius-pill);
      padding: 12px 28px;
      box-shadow: 0 6px 18px rgba(255,107,53,0.25);
    }
    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(255,107,53,0.4);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      padding: 8px;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: white;
      border-radius: 4px;
      transition: 0.3s;
    }
    /* 区块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }
    .section-sub {
      color: var(--text-weak);
      margin-bottom: 48px;
    }
    /* Hero */
    .hero {
      padding-top: calc(var(--header-height) + 60px);
      display: flex;
      align-items: center;
      gap: 40px;
      background: radial-gradient(circle at 20% 30%, rgba(0,201,167,0.08) 0%, transparent 40%);
    }
    .hero-left {
      flex: 1;
    }
    .hero-left h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .hero-left .subtitle {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-right {
      flex: 1;
      position: relative;
    }
    .hero-img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-hover);
      width: 100%;
      object-fit: cover;
    }
    .floating-badge {
      position: absolute;
      bottom: 20px;
      left: -10px;
      background: rgba(0,201,167,0.9);
      backdrop-filter: blur(8px);
      color: white;
      padding: 10px 18px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: 0 8px 18px rgba(0,0,0,0.15);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    /* 价值主张 */
    .value-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: center;
    }
    .value-highlight {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-lg);
      padding: 40px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .big-number {
      font-family: var(--font-mono);
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--secondary);
    }
    .value-list {
      display: flex;
      flex-direction: column;
      gap: 28px;
    }
    .value-item h3 {
      font-size: 1.3rem;
      margin-bottom: 6px;
      color: var(--primary);
    }
    /* 功能卡片 2x3 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      transition: all 0.3s;
    }
    .feature-card:hover {
      border-color: var(--secondary);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .feature-icon {
      font-size: 2.4rem;
      margin-bottom: 18px;
    }
    .feature-card h3 {
      font-size: 1.4rem;
      margin-bottom: 10px;
      color: var(--primary);
    }
    .badge-data {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      background: rgba(0,201,167,0.1);
      color: #0d6b5c;
      font-weight: 600;
      font-size: 0.85rem;
      padding: 6px 12px;
      border-radius: 30px;
      margin-top: 16px;
    }
    /* 场景卡片 */
    .scenarios-row {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 12px;
      scroll-snap-type: x mandatory;
    }
    .scenario-card {
      min-width: 300px;
      flex: 1;
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      scroll-snap-align: start;
    }
    .scenario-card img {
      height: 200px;
      width: 100%;
      object-fit: cover;
      border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    }
    .scenario-text {
      padding: 20px;
    }
    /* 案例 */
    .cases-block {
      display: flex;
      gap: 40px;
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 40px;
      align-items: center;
    }
    .logo-wall {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 20px;
      filter: grayscale(1);
      opacity: 0.7;
    }
    .logo-wall span {
      font-weight: 700;
      font-size: 1.2rem;
    }
    .testimonial {
      font-size: 1.3rem;
      font-weight: 600;
      color: var(--primary);
    }
    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      border: 1px solid var(--border-light);
      text-align: center;
      position: relative;
    }
    .pricing-card.popular {
      border: 2px solid var(--secondary);
      box-shadow: 0 0 0 4px rgba(0,201,167,0.06);
    }
    .popular-badge {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--accent);
      color: white;
      padding: 4px 18px;
      border-radius: 30px;
      font-size: 0.8rem;
      font-weight: 700;
    }
    .price {
      font-family: var(--font-mono);
      font-size: 2.6rem;
      font-weight: 700;
      color: var(--primary);
      margin: 20px 0;
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      padding: 18px 20px;
      border: 1px solid var(--border-light);
      cursor: pointer;
    }
    .faq-q {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }
    .faq-answer {
      margin-top: 12px;
      color: var(--text-body);
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-band {
      background: var(--primary);
      text-align: center;
      padding: 80px 20px;
      border-radius: var(--radius-lg);
      color: white;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      padding-bottom: 40px;
    }
    .social-icons {
      display: flex;
      gap: 14px;
      font-size: 1.5rem;
    }
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .pricing-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .hamburger { display: flex; }
      .nav-menu { 
        display: none; 
        position: fixed; top: var(--header-height); left: 0; width: 100%; 
        background: rgba(26,26,26,0.98); flex-direction: column; padding: 32px; gap: 24px;
      }
      .nav-menu.active { display: flex; }
      .hero { flex-direction: column; }
      .value-grid { grid-template-columns: 1fr; }
      .features-grid { grid-template-columns: 1fr; }
      .cases-block { flex-direction: column; }
      .pricing-grid { grid-template-columns: 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-left h1 { font-size: 2.2rem; }
    }