/* ==========================================================================
   CNQ ERP - Technical Documentation Styles
   ========================================================================== */

/* --- Variables & Theming --- */
:root {
    /* Colors */
    --color-bg-body: #F1F5F9; /* Soft Slate */
    --color-bg-card: #FFFFFF;
    --color-text-main: #0F172A; /* Slate 900 */
    --color-text-muted: #64748B; /* Slate 500 */
    --color-primary: #1E40AF; /* CNQ Blue - Deep and professional */
    --color-primary-hover: #1D4ED8;
    --color-border: #E2E8F0;
    
    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    /* Spacing & Layout */
    --max-width: 1024px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    
    /* Radius & Shadows */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-subtle: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
}

/* --- Reset & Base --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg-body);
    color: var(--color-text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Typography --- */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text-main);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: clamp(2rem, 3vw, 2.5rem);
    margin-top: var(--spacing-lg);
    border-bottom: 2px solid var(--color-border);
    padding-bottom: var(--spacing-xs);
}

h3 {
    font-size: 1.5rem;
    margin-top: var(--spacing-md);
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-muted);
    font-size: 1.125rem;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

strong {
    color: var(--color-text-main);
    font-weight: 600;
}

/* --- Layout --- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

header.site-header {
    background-color: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-subtle);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.brand {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--color-primary);
    text-decoration: none;
    letter-spacing: -0.03em;
}

nav.main-nav ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-md);
}

nav.main-nav a {
    color: var(--color-text-main);
    font-weight: 500;
    font-size: 1rem;
}

nav.main-nav a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

main {
    padding: var(--spacing-lg) 0;
    min-height: calc(100vh - 200px);
}

footer.site-footer {
    background-color: var(--color-bg-card);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* --- Components --- */
.hero {
    text-align: center;
    padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.hero p.lead {
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0 auto var(--spacing-md);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

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

.card p:last-child {
    margin-bottom: 0;
}

/* --- Code & Pre --- */
code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    background-color: #E2E8F0;
    color: #0F172A;
    padding: 0.2em 0.4em;
    border-radius: var(--radius-sm);
    font-size: 0.875em;
}

pre {
    background-color: #0F172A;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin-bottom: var(--spacing-sm);
}

pre code {
    background-color: transparent;
    color: #F8FAFC;
    padding: 0;
}

/* --- Utilities --- */
.text-center { text-align: center; }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-4 { margin-top: var(--spacing-md); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-4 { margin-bottom: var(--spacing-md); }

/* --- Responsive --- */
@media (max-width: 768px) {
    .header-inner {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    nav.main-nav ul {
        gap: var(--spacing-sm);
        flex-wrap: wrap;
        justify-content: center;
    }
}