/* roulang page: index */
:root {
      --primary-red: #E12B38;
      --primary-red-dark: #C72030;
      --accent-cyan: #00F0C8;
      --gold: #F0C060;
      --bg-deep: #0A0E17;
      --bg-card: rgba(20, 28, 43, 0.7);
      --bg-dark-panel: #141C2B;
      --text-white: #F5F6FA;
      --text-muted: #8892A4;
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-light: rgba(255, 255, 255, 0.18);
      --shadow-card: 0 10px 28px rgba(0, 0, 0, 0.55);
      --shadow-glow-red: 0 0 24px rgba(225, 43, 56, 0.5);
      --shadow-glow-cyan: 0 0 20px rgba(0, 240, 200, 0.25);
      --radius-card: 16px;
      --radius-btn: 10px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      --transition: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: var(--font-sans);
      background: radial-gradient(circle at 30% 10%, #141C2B 0%, #0A0E17 85%);
      color: var(--text-white);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .grid-container {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航栏 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 14, 23, 0.88);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.07);
      z-index: 50;
      display: flex;
      align-items: center;
      padding: 0 2rem;
      transition: var(--transition);
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 6px;
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #E12B38 20%, #FF5A5F 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .logo-icon {
      font-size: 1.8rem;
      color: var(--accent-cyan);
      -webkit-text-fill-color: initial;
      margin-right: 2px;
    }

    .nav-links {
      display: flex;
      gap: 2.8rem;
      margin-left: auto;
      margin-right: 2.5rem;
      align-items: center;
    }

    .nav-links a {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 0.95rem;
      text-decoration: none;
      position: relative;
      padding: 0.25rem 0;
      transition: var(--transition);
      letter-spacing: 0.3px;
    }

    .nav-links a:hover {
      color: white;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      box-shadow: 0 0 8px var(--accent-cyan);
      transition: width 0.2s ease;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 1.5rem;
    }

    .search-icon {
      color: var(--text-muted);
      font-size: 1.2rem;
      cursor: pointer;
      transition: var(--transition);
    }

    .search-icon:hover {
      color: white;
    }

    .login-link {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 0.95rem;
      text-decoration: none;
      transition: var(--transition);
    }

    .login-link:hover {
      color: white;
    }

    .btn-nav-cta {
      background: linear-gradient(135deg, #E12B38, #C72030);
      color: white;
      font-weight: 700;
      padding: 0.6rem 1.8rem;
      border-radius: 30px;
      font-size: 0.9rem;
      letter-spacing: 0.5px;
      text-decoration: none;
      box-shadow: 0 4px 14px rgba(225, 43, 56, 0.4);
      transition: var(--transition);
      border: none;
    }

    .btn-nav-cta:hover {
      background: #ff3b4a;
      box-shadow: 0 0 22px rgba(225, 43, 56, 0.8);
      color: white;
    }

    /* 移动端导航隐藏/汉堡 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
    }

    @media (max-width: 1024px) {
      .nav-links, .nav-actions .search-icon, .nav-actions .login-link {
        display: none;
      }
      .menu-toggle {
        display: block;
        margin-left: auto;
      }
      .nav-actions {
        gap: 1rem;
      }
    }

    /* Hero */
    #hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 5rem;
    }

    .hero-bg-glow {
      position: absolute;
      width: 700px;
      height: 700px;
      background: radial-gradient(circle, rgba(225,43,56,0.25) 0%, transparent 70%);
      top: -10%;
      left: -10%;
      filter: blur(80px);
      animation: floatGlow 8s infinite alternate;
    }

    .hero-bg-cyan {
      position: absolute;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(0,240,200,0.2) 0%, transparent 70%);
      bottom: -10%;
      right: -5%;
      filter: blur(70px);
      animation: floatGlow 10s infinite alternate-reverse;
    }

    @keyframes floatGlow {
      0% { transform: translate(0, 0) scale(1); }
      100% { transform: translate(30px, -30px) scale(1.15); }
    }

    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 2.5rem;
    }

    .hero-text {
      flex: 1;
    }

    .hero-text h1 {
      font-size: 3.8rem;
      font-weight: 800;
      line-height: 1.2;
      background: linear-gradient(to right, #fff, #e0e0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 1.5rem;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 2.2rem;
      max-width: 500px;
    }

    .btn-group {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary-red);
      color: white;
      font-weight: 700;
      padding: 0.9rem 2.4rem;
      border-radius: var(--radius-btn);
      text-decoration: none;
      box-shadow: 0 10px 24px rgba(225, 43, 56, 0.45);
      transition: var(--transition);
      border: none;
    }

    .btn-primary:hover {
      background: #ff3f4f;
      box-shadow: 0 0 28px rgba(225, 43, 56, 0.8);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.35);
      color: white;
      font-weight: 600;
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: var(--transition);
    }

    .btn-outline:hover {
      border-color: white;
      background: rgba(255,255,255,0.05);
    }

    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
    }

    .hero-visual img {
      max-width: 100%;
      border-radius: 28px;
      box-shadow: 0 0 40px rgba(0,240,200,0.2);
    }

    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 2.6rem;
      }
      .btn-group {
        justify-content: center;
      }
    }

    /* 板块通用 */
    section {
      padding: 5rem 0;
    }

    h2 {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 2.5rem;
      text-align: center;
      letter-spacing: -0.3px;
    }

    .card-glass {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }

    .card-glass:hover {
      border-color: rgba(255,255,255,0.15);
      transform: translateY(-5px);
    }

    /* features 网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 2rem;
    }

    .feature-icon {
      font-size: 2.5rem;
      color: var(--accent-cyan);
      margin-bottom: 1.2rem;
    }

    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 640px) {
      .features-grid { grid-template-columns: 1fr; }
    }

    /* 场景卡片 */
    .scenario-row {
      display: flex;
      gap: 2rem;
    }
    .scenario-card img {
      width: 100%;
      border-radius: 12px;
      height: 180px;
      object-fit: cover;
    }

    @media (max-width: 768px) {
      .scenario-row { flex-direction: column; }
    }

    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 2rem;
    }
    .metric-number {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--primary-red);
    }

    /* 价格 */
    .pricing-grid {
      display: flex;
      gap: 2rem;
      justify-content: center;
      flex-wrap: wrap;
    }
    .pricing-card.recommended {
      border: 1px solid rgba(0,240,200,0.4);
      box-shadow: 0 0 28px rgba(0,240,200,0.3);
    }

    .badge-gold {
      background: var(--gold);
      color: #0A0E17;
      font-weight: 700;
      padding: 0.2rem 1rem;
      border-radius: 20px;
      font-size: 0.8rem;
    }

    /* FAQ */
    .accordion-title {
      font-size: 1.1rem;
      font-weight: 600;
      color: white;
      background: transparent;
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: rgba(10,14,23,0.9);
      backdrop-filter: blur(10px);
      text-align: center;
      padding: 4rem 1rem;
    }

    footer {
      background: #0A0E17;
      padding: 3rem 1rem;
      color: var(--text-muted);
    }