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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
      background: url("assets/img/bg.png") no-repeat center bottom fixed;
  max-width: 100%;  
  max-height: 100%;
  background-size: cover;
  color: rgb(44,44,44);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

h1 {
    font-size: 3em;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    font-weight: 700;
}

.subtitle {
    font-size: 1.3em;
    opacity: 0.9;
    font-weight: 300;
}

.quick-ref {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.ref-card {
    background: rgba(30, 30, 30, 0.95);
    backdrop-filter: blur(10px);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
    border: 2px solid rgba(255, 255, 255, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.ref-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    opacity: 0.7;
}

.ref-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.ref-card h4 {
    color: #ffffff;
    margin-bottom: 20px;
    font-size: 1.4em;
    font-weight: 600;
    display: flex;
    align-items: center;
    border-bottom: 2px solid #444;
    padding-bottom: 10px;
}

.ref-card .icon {
    margin-right: 12px;
    font-size: 1.5em;
}

.ref-card ul {
    list-style: none;
    padding: 0;
}

.ref-card li {
    padding: 12px 0;
    border-bottom: 1px solid #444;
    font-family: 'Courier New', monospace;
    color: #cccccc;
    transition: color 0.2s ease;
    position: relative;
    padding-left: 15px;
}

.ref-card li:last-child {
    border-bottom: none;
}

.ref-card li::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: #667eea;
    font-size: 0.8em;
    top: 50%;
    transform: translateY(-50%);
}

.ref-card li:hover {
    color: #ffffff;
    background: #333333;
    border-radius: 5px;
    padding-left: 20px;
}

.command {
    color: #82b1ff;
    font-weight: bold;
}

.description {
    color: #b0b0b0;
    font-family: 'Segoe UI', sans-serif;
}

@media (max-width: 768px) {
    .quick-ref {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    h1 {
        font-size: 2.2em;
    }
    
    .ref-card {
        padding: 25px;
    }

    body {
        padding: 15px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.8em;
    }
    
    .subtitle {
        font-size: 1.1em;
    }
    
    .ref-card {
        padding: 20px;
    }
}