/* ΞSUS Website Styles - Inspired by LibrePGP's clean technical aesthetic */

:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --highlight-color: #e74c3c;
    --success-color: #27ae60;
    --text-color: #2c3e50;
    --text-light: #7f8c8d;
    --background: #ffffff;
    --background-light: #f8f9fa;
    --border-color: #dee2e6;
    --code-background: #f1f3f4;
    
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-family-mono: 'SF Mono', 'Monaco', 'Consolas', 'Liberation Mono', 'Courier New', monospace;
    
    --max-width: 1200px;
    --content-width: 800px;
}

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-color);
    background: var(--background);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header */
.site-header {
    background: var(--background);
    border-bottom: 2px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.xi-symbol {
    width: 32px;
    height: 32px;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
}

.main-nav {
    display: flex;
    gap: 2rem;
}

.main-nav a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s ease;
}

.main-nav a:hover {
    color: var(--accent-color);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--background-light) 0%, var(--background) 100%);
    border-bottom: 1px solid var(--border-color);
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    font-weight: 400;
}

.hero-tagline {
    font-size: 1.2rem;
    color: var(--text-color);
    max-width: 600px;
    margin: 0 auto;
}

/* Main Content */
.main-content {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 3rem 2rem;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--primary-color);
    font-weight: 600;
    margin: 2rem 0 1rem 0;
    line-height: 1.3;
}

h2 {
    font-size: 1.8rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

h3 {
    font-size: 1.4rem;
}

p {
    margin-bottom: 1.5rem;
}

/* Formula Block */
.formula-block {
    background: var(--code-background);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    margin: 2rem 0;
    text-align: center;
    font-family: var(--font-family-mono);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

/* Resource Grid */
.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.resource-card {
    background: var(--background);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: all 0.3s ease;
}

.resource-card:hover {
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.1);
    transform: translateY(-2px);
}

.resource-card h3 {
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.resource-card p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

.resource-card a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
}

.resource-card a:hover {
    text-decoration: underline;
}

/* Quote Block */
.quote-block {
    margin: 3rem 0;
    padding: 2rem;
    background: var(--background-light);
    border-left: 4px solid var(--accent-color);
    border-radius: 0 8px 8px 0;
}

.quote-block blockquote {
    font-style: italic;
    color: var(--text-light);
    text-align: center;
    font-size: 1.1rem;
}

/* Lists */
ul, ol {
    margin-left: 2rem;
    margin-bottom: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
}

/* Links */
a {
    color: var(--accent-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Code */
code {
    background: var(--code-background);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: var(--font-family-mono);
    font-size: 0.9em;
}

/* Footer */
.site-footer {
    background: var(--primary-color);
    color: white;
    padding: 3rem 0;
    margin-top: 4rem;
    text-align: center;
}

.site-footer p {
    margin-bottom: 1rem;
}

.footnote {
    font-size: 0.9rem;
    opacity: 0.8;
    font-style: italic;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .main-nav {
        gap: 1rem;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.3rem;
    }
    
    .main-content {
        padding: 2rem 1rem;
    }
    
    .resource-grid {
        grid-template-columns: 1fr;
    }
    
    .formula-block {
        padding: 1.5rem;
        font-size: 1.2rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .formula-block {
        font-size: 1rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .site-header,
    .site-footer {
        display: none;
    }
    
    .main-content {
        max-width: none;
        margin: 0;
        padding: 0;
    }
    
    a {
        color: var(--text-color);
        text-decoration: underline;
    }
    
    .resource-card {
        border: 1px solid var(--border-color);
        break-inside: avoid;
    }
}