/* Base styles */
:root {
    --primary-color: #2979ff;
    --text-color: #2c3e50;
    --background-light: #f8f9fa;
    --border-color: #e9ecef;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --spacing-unit: 1rem;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

body {
    color: var(--text-color);
    line-height: 1.8;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--spacing-unit);
    font-family: var(--font-family);
    font-size: 16px;
}

/* Header styles */
.header-section {
    text-align: center;
    margin: calc(var(--spacing-unit) * 3) 0;
    padding-bottom: calc(var(--spacing-unit) * 2);
    border-bottom: 1px solid var(--border-color);
}

.header-section h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-unit);
    font-weight: 700;
    color: #1a202c;
}

.header-section img {
    height: 1.5em;
    vertical-align: middle;
    margin-left: var(--spacing-unit);
    transition: transform 0.3s ease;
}

.header-section img:hover {
    transform: rotate(15deg);
}

/* Table of Contents */
.toc {
    background-color: #f8f9fa;
    padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 2);
    border-radius: 8px;
    margin: calc(var(--spacing-unit) * 2) 0;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-color);
}

.toc h2 {
    margin-top: 0;
    color: #1a202c;
    border-bottom: 1px solid #e2e8f0;
    padding-bottom: calc(var(--spacing-unit) * 0.5);
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    font-size: 1.5rem;
}

.toc ul {
    list-style-type: none;
    padding-left: 0;
    margin: 0;
}

.toc ul ul {
    padding-left: calc(var(--spacing-unit) * 1.5);
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
}

.toc a {
    color: #4a5568;
    text-decoration: none;
    line-height: 1.8;
    display: inline-block;
    transition: all 0.2s ease;
    border-bottom: none;
    padding: 0.25rem 0;
}

.toc a:hover {
    color: var(--primary-color);
    transform: translateX(3px);
    border-bottom: none;
}

/* Headings */
h2 {
    font-size: 1.8rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: calc(var(--spacing-unit) * 0.5);
    margin-top: calc(var(--spacing-unit) * 3);
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    font-weight: 600;
    color: #1a202c;
}

h3 {
    font-size: 1.5rem;
    color: #2d3748;
    margin-top: calc(var(--spacing-unit) * 2);
    margin-bottom: var(--spacing-unit);
    font-weight: 600;
}

h4 {
    font-size: 1.2rem;
    color: #4a5568;
    margin-top: calc(var(--spacing-unit) * 1.5);
    margin-bottom: var(--spacing-unit);
    font-weight: 600;
}

/* Blockquotes */
blockquote.highlight {
    background-color: #f8f9fa;
    border-left: 4px solid var(--primary-color);
    padding: calc(var(--spacing-unit) * 1.5);
    margin: calc(var(--spacing-unit) * 1.5) 0;
    border-radius: 0 8px 8px 0;
    font-style: italic;
    color: #4a5568;
}

/* Tables */
.challenge-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: calc(var(--spacing-unit) * 1.5) 0;
    background-color: white;
    box-shadow: var(--shadow);
    border-radius: 8px;
    overflow: hidden;
}

.challenge-table th,
.challenge-table td {
    padding: calc(var(--spacing-unit) * 0.75);
    border: none;
    border-bottom: 1px solid var(--border-color);
    text-align: left;
}

.challenge-table th {
    background-color: #f1f5f9;
    font-weight: 600;
    text-align: left;
    color: #4a5568;
}

.challenge-table tr:last-child td {
    border-bottom: none;
}

.challenge-table tr:hover {
    background-color: #f8fafc;
}

/* Process Steps */
.process-steps {
    display: flex;
    gap: calc(var(--spacing-unit) * 2);
    align-items: center;
    justify-content: center;
    margin: calc(var(--spacing-unit) * 2) 0;
    background-color: white;
    padding: calc(var(--spacing-unit) * 1.5);
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    overflow-x: auto;
    position: relative;
    z-index: 1;
}

.process-steps::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    z-index: -1;
}

.process-steps div {
    text-align: center;
    flex-shrink: 0;
    position: relative;
    transition: transform 0.2s ease;
}

.process-steps div:hover {
    transform: translateY(-5px);
}

.process-steps img {
    width: 180px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
}

.process-steps img:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
}

.process-steps p {
    margin-top: var(--spacing-unit);
    font-weight: 600;
    color: #4a5568;
}

.process-steps pre {
    background-color: #f8fafc;
    padding: calc(var(--spacing-unit) * 1.5);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    margin: 0;
    font-size: 0.9rem;
    max-width: 300px;
    overflow-x: auto;
    border: 1px solid #e2e8f0;
}

.arrow {
    color: #718096;
    font-size: 1.5rem;
    opacity: 0.8;
    transition: opacity 0.2s ease;
}

.arrow:hover {
    opacity: 1;
}

/* Lists */
ul, ol {
    padding-left: calc(var(--spacing-unit) * 2);
    margin: var(--spacing-unit) 0;
}

li {
    margin-bottom: calc(var(--spacing-unit) * 0.5);
    line-height: 1.7;
}

li::marker {
    color: var(--primary-color);
}

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: all 0.2s ease;
    border-bottom: 1px solid transparent;
}

a:hover {
    text-decoration: none;
    border-bottom: 1px solid var(--primary-color);
}

/* Code blocks */
pre {
    background-color: #f5f7f9;
    padding: var(--spacing-unit);
    border-radius: 8px;
    overflow-x: auto;
    margin: var(--spacing-unit) 0;
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    border: 1px solid #e9ecef;
}

code {
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    background-color: #f5f7f9;
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-size: 0.9em;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .process-steps {
        flex-direction: column;
        gap: calc(var(--spacing-unit) * 1.5);
        padding: var(--spacing-unit);
    }
    
    .arrow {
        transform: rotate(90deg);
        margin: 0.5rem 0;
    }
    
    .process-steps img {
        width: 100%;
        max-width: 300px;
    }
    
    .header-section h1 {
        font-size: 1.8rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    h3 {
        font-size: 1.3rem;
    }
    
    body {
        padding: 0 calc(var(--spacing-unit) * 0.5);
        font-size: 15px;
    }
    
    .toc {
        padding: var(--spacing-unit);
    }
}

/* Custom Footer Styles */
.site-footer {
    border-top: 1px solid var(--border-color);
    padding: calc(var(--spacing-unit) * 1.5) 0;
    margin-top: calc(var(--spacing-unit) * 3);
    font-size: 0.9rem;
    text-align: center;
    color: #718096;
}

.site-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.site-footer a:hover {
    text-decoration: underline;
}

.footer-col {
    display: block;
    width: 100%;
    margin-bottom: 1rem;
}

.footer-col p {
    margin: 0;
    line-height: 1.8;
}

/* Selection highlight */
::selection {
    background-color: var(--primary-color);
    color: white;
}

/* Print styles */
@media print {
    body {
        font-size: 12pt;
        line-height: 1.5;
        color: #000;
        background: #fff;
        max-width: 100%;
    }
    
    .header-section, .toc, .site-footer {
        padding: 0;
        margin: 1cm 0;
        border: none;
        box-shadow: none;
    }
    
    .process-steps {
        display: block;
        box-shadow: none;
        break-inside: avoid;
    }
    
    .process-steps div {
        page-break-inside: avoid;
        margin-bottom: 1cm;
    }
    
    a {
        color: #000;
        text-decoration: underline;
    }
    
    a::after {
        content: " (" attr(href) ")";
        font-size: 90%;
    }
    
    img {
        max-width: 100% !important;
    }
    
    .arrow {
        display: none;
    }
    
    h2, h3, h4 {
        page-break-after: avoid;
    }
    
    p, h2, h3 {
        orphans: 3;
        widows: 3;
    }
    
    pre, blockquote {
        border-left: 3pt solid #ccc;
        padding: 0.5cm;
        page-break-inside: avoid;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0000EE;
        --text-color: #000000;
        --background-light: #FFFFFF;
        --border-color: #000000;
        --shadow: 0 0 0 1px #000000;
    }
    
    body {
        background-color: white;
        color: black;
    }
    
    a {
        text-decoration: underline;
    }
    
    .toc, .process-steps, pre, blockquote.highlight {
        border: 1px solid black;
        box-shadow: none;
    }
}