/* =========================================================
   styles.css
   Complete CSS for Artificial Intelligence Theory Notes
========================================================= */

/* --- 1. CSS VARIABLES (Light Theme Palette) --- */
:root {
    --bg-color: #f9fbfd;
    --text-color: #333333;
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --highlight-bg: #e8f4f8;
    --border-color: #dcdde1;
    --box-bg: #ffffff;
    --code-bg: #f1f2f6;
    --success: #27ae60;
    --danger: #e74c3c;
    --warning: #f39c12;
    --purple: #8e44ad;
}

/* --- 2. GLOBAL & BODY STYLES --- */
* {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 20px;
}

/* --- 3. LAYOUT / CONTAINER --- */
.container {
    max-width: 1000px;
    margin: 0 auto;
    background: var(--box-bg);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

/* --- 4. TYPOGRAPHY & HEADINGS --- */
h1 {
    text-align: center;
    color: var(--primary-color);
    border-bottom: 3px solid var(--accent-color);
    padding-bottom: 10px;
    margin-bottom: 40px;
}

h2 {
    color: var(--secondary-color);
    border-left: 5px solid var(--accent-color);
    padding-left: 15px;
    margin-top: 50px;
    background: var(--highlight-bg);
    padding: 10px 15px;
    border-radius: 0 5px 5px 0;
}

h3 {
    color: var(--primary-color);
    margin-top: 30px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 5px;
}

p, li {
    font-size: 1.05em;
}

ul, ol {
    padding-left: 25px;
    margin-bottom: 15px;
}

li {
    margin-bottom: 8px;
}

.math-text {
    font-family: 'Times New Roman', Times, serif;
    font-style: italic;
    font-size: 1.1em;
}

.highlight-text {
    background-color: #fff3cd;
    padding: 2px 5px;
    border-radius: 3px;
}

/* --- 5. COMPONENT BOXES --- */
.concept-box {
    background-color: var(--box-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.02);
}

.concept-box strong {
    color: var(--accent-color);
}

.formula-box {
    background-color: var(--code-bg);
    padding: 15px;
    border-radius: 5px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 1.1em;
    margin: 15px 0;
    border-left: 4px solid var(--warning);
    overflow-x: auto;
}

/* First part used secondary color for formula box, this handles consistency */
.formula-box.logic {
    border-left: 4px solid var(--secondary-color);
}

.example-box {
    background-color: #fcfdfd;
    border-left: 4px solid var(--success);
    padding: 15px;
    margin: 15px 0;
    border-radius: 0 5px 5px 0;
}

/* --- 6. TABLES --- */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: var(--box-bg);
}

th, td {
    border: 1px solid var(--border-color);
    padding: 12px;
    text-align: left; /* Default text align */
}

/* Centered text for ID3 and K-means tables */
table.center-text th, 
table.center-text td {
    text-align: center;
}

th {
    background-color: var(--primary-color);
    color: white;
}

tr:nth-child(even) {
    background-color: #f8f9fa;
}

/* --- 7. WUMPUS WORLD GRID MATRIX --- */
.grid-matrix {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 5px;
    margin: 20px 0;
}

.grid-cell {
    border: 2px solid var(--primary-color);
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    background: #fafafa;
    text-align: center;
    padding: 5px;
    font-size: 0.9em;
}

/* --- 8. DIAGRAMS & FLOWCHARTS (Decision Tree & ML) --- */
.tree-diagram {
    text-align: center;
    background: var(--highlight-bg);
    padding: 20px;
    border-radius: 8px;
    font-weight: bold;
    color: var(--secondary-color);
    margin: 20px 0;
    border: 1px dashed var(--accent-color);
    line-height: 1.8;
}

.flow-diagram {
    display: flex;
    justify-content: space-around;
    align-items: center;
    background: var(--highlight-bg);
    padding: 20px;
    border-radius: 8px;
    font-weight: bold;
    color: var(--secondary-color);
    margin: 20px 0;
    border: 1px solid var(--accent-color);
    text-align: center;
    flex-wrap: wrap; /* Helps on smaller screens */
    gap: 10px;
}

.flow-step {
    background: white;
    padding: 10px 20px;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.arrow {
    font-size: 1.5em;
    color: var(--accent-color);
}

/* --- 9. RESPONSIVE DESIGN TWEAKS --- */
@media (max-width: 768px) {
    .container {
        padding: 20px;
    }
    
    .grid-cell {
        height: auto;
        min-height: 60px;
        font-size: 0.8em;
    }

    .flow-diagram {
        flex-direction: column;
    }

    .arrow {
        transform: rotate(90deg);
        margin: 10px 0;
    }
    
    table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }
}