/* Custom CSS for Website Demo */

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    color: #333;
}

.container {
    display: flex;
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    overflow: hidden;
}

.sidebar {
    width: 250px;
    background: linear-gradient(180deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.sidebar h3 {
    margin-top: 0;
    color: #fff;
    border-bottom: 2px solid rgba(255, 255, 255, 0.3);
    padding-bottom: 10px;
}

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

.sidebar li {
    margin: 10px 0;
}

.sidebar a {
    color: #070101;
    text-shadow: 0 1px 1px rgba(0, 0, 0, 0.3);
    text-decoration: none;
    transition: all 0.3s;
    display: block;
    padding: 8px 12px;
    border-radius: 5px;
    font-weight: 600;
}

.sidebar a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
}

.content {
    flex: 1;
    padding: 40px;
    background: #fafbfc;
}

h1 {
    color: #2c3e50;
    border-bottom: 3px solid #667eea;
    padding-bottom: 10px;
    margin-bottom: 30px;
}

h2 {
    color: #34495e;
    margin-top: 35px;
    margin-bottom: 20px;
    border-left: 4px solid #667eea;
    padding-left: 15px;
}

h3 {
    color: #2c3e50;
    margin-top: 25px;
}

.image-desc {
    font-style: italic;
    color: #7f8c8d;
    margin-top: 10px;
    font-size: 0.9em;
}

ul {
    background: #f8f9fa;
    padding: 15px 20px;
    border-left: 4px solid #667eea;
    border-radius: 5px;
}

strong {
    color: #2c3e50;
}

p {
    margin-bottom: 15px;
    text-align: justify;
}

.highlight {
    background: linear-gradient(120deg, #a8edea 0%, #fed6e3 100%);
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
}


/* ➕ Thuộc tính cho hình ảnh */

img {
    width: 800px;
    height: 450px;
    display: block;
    margin: 30px auto;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    object-fit: cover;
}


/* Responsive adjustments */

@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }
    .content {
        padding: 20px;
    }
    img {
        width: 100%;
        height: auto;
        max-width: 400px;
    }
    h1 {
        font-size: 2rem;
    }
    h2 {
        font-size: 1.5rem;
    }
}


/* Custom scrollbar */

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #764ba2;
}