/* roulang page: index */
:root {
      --bg-deep: #0A0E1A;
      --bg-panel: #0F1525;
      --surface-glass: rgba(255,255,255,0.04);
      --border-light: rgba(255,255,255,0.08);
      --border-glow: rgba(0,240,255,0.25);
      --text-primary: #F0F4FF;
      --text-secondary: rgba(220,225,245,0.8);
      --text-muted: rgba(180,190,215,0.65);
      --cyan: #00F0FF;
      --cyan-dark: #0088AA;
      --orange: #FF4D2E;
      --shadow-card: 0 10px 30px rgba(0,0,0,0.55);
      --shadow-glow: 0 0 20px rgba(0,240,255,0.5);
      --radius-card: 18px;
      --radius-btn: 40px;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Inter", system-ui, sans-serif;
      --font-mono: "Rajdhani", "Inter", monospace;
    }

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

    body {
      background-color: var(--bg-deep);
      color: var(--text-primary);
      font-family: var(--font-sans);
      line-height: 1.65;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      background-image: radial-gradient(circle at 30% 10%, rgba(0,240,255,0.04) 0%, transparent 45%);
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 - 桌面胶囊 */
    .nav {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 920px;
      background: rgba(15, 21, 37, 0.8);
      backdrop-filter: blur(25px);
      border-radius: 60px;
      padding: 10px 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      z-index: 1000;
      border: 1px solid var(--border-light);
      box-shadow: 0 10px 30px rgba(0,0,0,0.6);
      transition: all 0.2s ease;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 20px;
      letter-spacing: 1px;
      color: white;
      text-decoration: none;
    }
    .logo-dot {
      width: 10px;
      height: 10px;
      background: var(--cyan);
      border-radius: 50%;
      box-shadow: 0 0 14px var(--cyan);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: rgba(255,255,255,0.75);
      text-decoration: none;
      font-size: 15px;
      font-weight: 500;
      position: relative;
      padding-bottom: 4px;
      transition: 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--cyan);
      transition: 0.2s ease;
      transform: translateX(-50%);
    }
    .nav-links a:hover {
      color: white;
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 24px;
    }

    /* 移动底部导航 (隐藏默认用来替代移动胶囊) */
    .mobile-bottom-nav {
      display: none;
    }

    @media (max-width: 768px) {
      .nav {
        top: auto;
        bottom: 12px;
        left: 10px;
        right: 10px;
        transform: none;
        border-radius: 40px;
        padding: 8px 18px;
        background: rgba(10,14,26,0.9);
        backdrop-filter: blur(30px);
        justify-content: center;
        gap: 0;
      }
      .logo {
        display: none;
      }
      .nav-links {
        gap: 20px;
      }
      .nav-links a {
        font-size: 14px;
      }
    }

    /* hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center 30%;
      background-blend-mode: overlay;
      background-color: rgba(10, 14, 26, 0.75);
      isolation: isolate;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 20% 40%, rgba(0,240,255,0.18) 0%, transparent 60%);
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      margin-top: 40px;
    }
    .hero h1 {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      color: white;
    }
    .hero .highlight {
      color: var(--cyan);
      text-shadow: 0 0 12px rgba(0,240,255,0.6);
    }
    .hero p {
      font-size: 1.2rem;
      color: rgba(230,235,255,0.85);
      margin-bottom: 38px;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-cyan {
      background: linear-gradient(135deg, #00F0FF, #0088AA);
      border: none;
      padding: 14px 38px;
      border-radius: 40px;
      color: #0A0E1A;
      font-weight: 600;
      font-size: 17px;
      box-shadow: 0 0 22px rgba(0,240,255,0.55);
      cursor: pointer;
      transition: 0.2s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-cyan:hover {
      box-shadow: 0 0 35px rgba(0,240,255,0.8);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--cyan);
      color: var(--cyan);
      padding: 14px 38px;
      border-radius: 40px;
      font-weight: 600;
      backdrop-filter: blur(5px);
      transition: 0.2s;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: 0 0 15px rgba(0,240,255,0.3);
    }

    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .glass-card {
      background: var(--surface-glass);
      backdrop-filter: blur(18px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 28px;
      transition: 0.25s;
    }
    .glass-card:hover {
      box-shadow: 0 12px 38px rgba(0,240,255,0.15);
    }
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
      margin-top: 30px;
    }
    .feature-icon {
      width: 55px;
      height: 55px;
      background: rgba(0,240,255,0.08);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }
    .progress-bar {
      height: 4px;
      background: var(--cyan);
      width: 50%;
      margin-top: 20px;
      border-radius: 10px;
      opacity: 0.9;
    }

    .scenario-row {
      display: flex;
      gap: 60px;
      align-items: center;
      margin: 60px 0;
    }
    .scenario-img {
      width: 45%;
      border-radius: 24px;
    }

    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 15px;
      scrollbar-width: thin;
    }
    .case-card {
      min-width: 280px;
      background: var(--surface-glass);
      backdrop-filter: blur(20px);
      border-radius: 20px;
      padding: 24px;
    }
    .pricing-grid {
      display: flex;
      gap: 28px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .price-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(10px);
      border-radius: 24px;
      padding: 36px 28px;
      flex: 1;
      min-width: 240px;
      border: 1px solid rgba(255,255,255,0.05);
    }
    .price-highlight {
      border: 1px solid var(--cyan);
      box-shadow: 0 0 30px rgba(0,240,255,0.35);
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .faq-question {
      padding: 22px 10px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .cta-particle {
      background: radial-gradient(circle at 30% 40%, #0F1525, #050812);
      position: relative;
    }

    footer {
      background: #060A12;
      padding: 70px 0 30px;
    }

    @media (max-width: 768px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .hero h1 { font-size: 40px; }
    }
    @media (max-width: 520px) {
      .features-grid { grid-template-columns: 1fr; }
      .scenario-row { flex-direction: column; }
      .container { padding: 0 20px; }
    }