/* roulang page: index */
:root {
      /* 核心色彩系统 */
      --color-deep-space: #0A0E27;
      --color-dark-bg: #0D1129;
      --color-electric-cyan: #00F0FF;
      --color-electric-cyan-light: #66F7FF;
      --color-neon-pink: #FF3CAC;
      --color-neon-pink-glow: rgba(255, 60, 172, 0.7);
      --color-white: #FFFFFF;
      --color-white-80: rgba(255, 255, 255, 0.8);
      --color-white-55: rgba(255, 255, 255, 0.55);
      --color-white-20: rgba(255, 255, 255, 0.2);
      --color-white-04: rgba(255, 255, 255, 0.04);
      --color-white-08: rgba(255, 255, 255, 0.08);
      
      --border-glow: rgba(0, 240, 255, 0.25);
      --border-glow-strong: rgba(0, 240, 255, 0.5);
      
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow-cyan: 0 0 20px rgba(0, 240, 255, 0.5);
      --shadow-glow-cyan-hover: 0 0 32px rgba(0, 240, 255, 0.8);
      --shadow-glow-pink: 0 0 18px rgba(255, 60, 172, 0.6);
      
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-xl: 20px;
      --radius-full: 50px;
      
      --font-sans: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
      
      --container-max: 1280px;
      --section-gap: 100px;
      --card-gap: 28px;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--color-dark-bg);
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--color-dark-bg);
      color: var(--color-white-80);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    button, input, textarea {
      font-family: inherit;
      font-size: inherit;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航系统 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.88);
      backdrop-filter: blur(22px);
      -webkit-backdrop-filter: blur(22px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.3);
      transition: background 0.3s ease;
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--color-white);
      letter-spacing: -0.3px;
    }

    .logo-icon {
      width: 10px;
      height: 10px;
      background: var(--color-electric-cyan);
      border-radius: 50%;
      box-shadow: 0 0 12px var(--color-electric-cyan);
      animation: pulse-dot 1.8s infinite;
    }

    @keyframes pulse-dot {
      0% { opacity: 0.8; transform: scale(1); }
      50% { opacity: 1; transform: scale(1.3); }
      100% { opacity: 0.8; transform: scale(1); }
    }

    .logo-text {
      background: linear-gradient(135deg, #00F0FF 0%, #66F7FF 70%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: var(--color-white-80);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 6px 0;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--color-electric-cyan);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--color-electric-cyan);
      transition: width 0.25s ease;
      box-shadow: 0 0 8px var(--color-electric-cyan);
    }

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

    .btn-ghost-nav {
      background: transparent;
      border: 1.5px solid var(--color-electric-cyan);
      color: var(--color-electric-cyan);
      padding: 10px 24px;
      border-radius: var(--radius-full);
      font-weight: 600;
      transition: all 0.25s ease;
      cursor: pointer;
      font-size: 0.9rem;
    }

    .btn-ghost-nav:hover {
      background: rgba(0, 240, 255, 0.12);
      box-shadow: 0 0 16px rgba(0, 240, 255, 0.35);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }

    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--color-white);
      border-radius: 4px;
      transition: 0.3s;
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: rgba(10, 14, 39, 0.96);
        backdrop-filter: blur(28px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 36px;
        transition: right 0.35s ease;
        z-index: 999;
        border-left: 1px solid rgba(0,240,255,0.2);
      }
      .nav-links.active {
        right: 0;
      }
      .hamburger {
        display: flex;
        z-index: 1001;
      }
      .btn-ghost-nav {
        margin-top: 16px;
      }
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      display: flex;
      align-items: center;
      gap: 48px;
    }

    .hero-content {
      flex: 1;
    }

    .hero h1 {
      font-size: clamp(2.4rem, 5vw, 3.4rem);
      font-weight: 800;
      color: var(--color-white);
      line-height: 1.25;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 1.1rem;
      color: var(--color-white-55);
      margin-bottom: 32px;
      max-width: 560px;
    }

    .hero-buttons {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #00F0FF, #0088CC);
      border: none;
      color: #0A0E27;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-full);
      cursor: pointer;
      box-shadow: var(--shadow-glow-cyan);
      transition: all 0.3s ease;
      font-size: 1rem;
    }

    .btn-primary:hover {
      box-shadow: var(--shadow-glow-cyan-hover);
      transform: scale(1.03);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--color-electric-cyan);
      color: var(--color-electric-cyan);
      padding: 14px 36px;
      border-radius: var(--radius-full);
      font-weight: 600;
      cursor: pointer;
      transition: 0.3s;
    }

    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
      box-shadow: 0 0 16px rgba(0,240,255,0.25);
    }

    .hero-visual {
      flex: 1;
      background: rgba(255,255,255,0.02);
      border-radius: var(--radius-xl);
      border: 1px solid var(--border-glow);
      padding: 16px;
      backdrop-filter: blur(10px);
      box-shadow: var(--shadow-card);
    }

    .hero-visual img {
      border-radius: 12px;
      width: 100%;
      opacity: 0.95;
    }

    /* 通用区块 */
    .section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--color-white);
      margin-bottom: 16px;
    }

    .glass-card {
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      border-color: var(--color-electric-cyan);
      box-shadow: 0 0 24px rgba(0,240,255,0.3);
      transform: translateY(-4px);
    }

    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: var(--card-gap);
    }

    .feature-card {
      padding: 28px;
      text-align: left;
    }

    .feature-icon {
      font-size: 2rem;
      color: var(--color-electric-cyan);
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-size: 1.3rem;
      font-weight: 600;
      color: var(--color-white);
      margin-bottom: 10px;
    }

    .data-mono {
      font-family: var(--font-mono);
      color: var(--color-neon-pink);
      font-weight: 600;
      margin-top: 12px;
    }

    /* 案例瀑布 */
    .cases-masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      overflow: hidden;
    }

    .case-img {
      height: 160px;
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .case-card-content {
      padding: 20px;
    }

    .case-tag {
      color: var(--color-electric-cyan);
      font-family: var(--font-mono);
      font-size: 0.9rem;
    }

    /* 方案对比 */
    .pricing-row {
      display: flex;
      gap: 32px;
      align-items: center;
      justify-content: center;
    }

    .plan-card {
      flex: 1;
      padding: 36px;
      position: relative;
    }

    .plan-highlight {
      border-color: var(--color-electric-cyan);
      box-shadow: 0 0 28px rgba(0,240,255,0.4);
    }

    .badge-hot {
      background: var(--color-neon-pink);
      color: white;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 700;
      position: absolute;
      top: -12px;
      right: 20px;
    }

    /* FAQ */
    .faq-item {
      margin-bottom: 16px;
      border-radius: var(--radius-md);
    }

    .faq-question {
      background: rgba(255,255,255,0.04);
      padding: 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      border: 1px solid transparent;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: rgba(0,0,0,0.2);
    }

    /* CTA */
    .cta-block {
      background: linear-gradient(180deg, #0A0E27 0%, #0D1129 100%);
      border: 1px solid var(--border-glow-strong);
      border-radius: 24px;
      padding: 60px 40px;
    }

    .input-glow {
      background: rgba(255,255,255,0.06);
      border: 1px solid rgba(0,240,255,0.2);
      color: white;
      padding: 14px;
      border-radius: 12px;
      width: 100%;
      margin-bottom: 16px;
    }

    .input-glow:focus {
      border-color: var(--color-electric-cyan);
      outline: none;
      box-shadow: 0 0 12px rgba(0,240,255,0.6);
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

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

    @media (max-width: 768px) {
      .hero { flex-direction: column; }
      .features-grid { grid-template-columns: 1fr; }
      .cases-masonry { grid-template-columns: 1fr; }
      .pricing-row { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }