:root {
    /* Core colors */
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    
    /* Text colors */
    --text-primary: #e6edf3;
    --text-secondary: #c9d1d9;
    --text-muted: #8b949e;
    
    /* Syntax highlight colors */
    --color-syntax-comment: #8b949e;
    --color-syntax-function: #d2a8ff;
    --color-syntax-keyword: #ff7b72;
    --color-syntax-string: #a5d6ff;
    --color-syntax-number: #79c0ff;
    --color-syntax-constant: #ffa657;
    
    /* Tag colors */
    --tag-fundamental: #9b4dca;
    --tag-architecture: #f97316;
    --tag-learning: #10b981;
    --tag-nlp: #3b82f6;
    --tag-technical: #f43f5e;
    --tag-hardware: #8b5cf6;
    
    /* UI elements */
    --border-color: #30363d;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --highlight: #58a6ff;
    
    /* Animations */
    --transition-speed: 0.2s;
}

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

body {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 92%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Typography */
h1, h2, h3 {
    font-weight: 600;
    line-height: 1.2;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(90deg, var(--color-syntax-string) 0%, var(--color-syntax-function) 50%, var(--color-syntax-keyword) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: inline-block;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.highlight-text {
    color: var(--color-syntax-keyword);
    font-weight: 700;
}

/* Header styles */
header {
    background-color: var(--bg-secondary);
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

/* Search and filter area */
.search-filter {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1rem;
}

#search {
    padding: 0.75rem 1rem;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    font-family: 'Fira Code', monospace;
    width: 100%;
    transition: border-color var(--transition-speed);
}

#search:focus {
    outline: none;
    border-color: var(--highlight);
    box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.2);
}

.tag-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag-btn {
    padding: 0.4rem 0.75rem;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    font-family: 'Fira Code', monospace;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.tag-btn:hover {
    background-color: rgba(88, 166, 255, 0.1);
    border-color: var(--highlight);
}

.tag-btn.active {
    background-color: var(--highlight);
    color: var(--bg-primary);
    border-color: var(--highlight);
}

/* Term count display */
.term-count {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    font-family: 'Fira Code', monospace;
}

#visible-count {
    color: var(--color-syntax-number);
    font-weight: 500;
}

/* Term cards grid */
.terms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.term-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    position: relative;
    overflow: hidden;
}

.term-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px var(--shadow-color);
    border-color: var(--highlight);
}

.term-header {
    margin-bottom: 1rem;
}

.term-title {
    font-family: 'Fira Code', monospace;
    font-size: 1.25rem;
    color: var(--color-syntax-function);
    margin-bottom: 0.5rem;
}

.term-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.term-tag {
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: 'Fira Code', monospace;
}

.term-tag[data-tag="fundamental"] {
    background-color: rgba(155, 77, 202, 0.2);
    color: var(--tag-fundamental);
}

.term-tag[data-tag="architecture"] {
    background-color: rgba(249, 115, 22, 0.2);
    color: var(--tag-architecture);
}

.term-tag[data-tag="learning"] {
    background-color: rgba(16, 185, 129, 0.2);
    color: var(--tag-learning);
}

.term-tag[data-tag="nlp"] {
    background-color: rgba(59, 130, 246, 0.2);
    color: var(--tag-nlp);
}

.term-tag[data-tag="technical"] {
    background-color: rgba(244, 63, 94, 0.2);
    color: var(--tag-technical);
}

.term-tag[data-tag="hardware"] {
    background-color: rgba(139, 92, 246, 0.2);
    color: var(--tag-hardware);
}

.term-definition {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

.term-number {
    position: absolute;
    bottom: 0.5rem;
    right: 0.75rem;
    font-family: 'Fira Code', monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
    opacity: 0.4;
}

/* Footer */
footer {
    margin-top: auto;
    padding: 1.5rem 0;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .terms-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .terms-grid {
        grid-template-columns: 1fr;
    }
    
    .tag-filters {
        overflow-x: auto;
        padding-bottom: 0.5rem;
        flex-wrap: nowrap;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.term-card {
    animation: fadeIn 0.3s ease-out;
}

/* Accessibility focus styles */
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--highlight);
    outline-offset: 2px;
}

/* Dark mode indicator */
body::before {
    content: "";
    position: fixed;
    top: 20px;
    right: 20px;
    width: 10px;
    height: 10px;
    background-color: var(--color-syntax-keyword);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--color-syntax-keyword);
    z-index: 1000;
}