/* SEIBELS Base CSS - Monochromatic, rigid lines aesthetic */

/* Reset and base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'Roboto Mono', 'Consolas', monospace;
    --font-heading: 'Work Sans', 'Inter', sans-serif;

    /* Colors - White label overridable */
    --color-primary: #000000;
    --color-secondary: #333333;
    --color-accent: #666666;
    --color-bg: #FFFFFF;
    --color-text: #000000;
    --color-border: #CCCCCC;
    --color-error: #B00020;
    --color-success: #00875A;
    --color-warning: #FF8B00;
    --color-muted: #999999;

    /* Spacing scale (8px base) */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* No border-radius - everything is square */
    --radius: 0px;

    /* Rigid lines */
    --border-width: 1px;
    --border-thick: 2px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
}

/* Typography */
html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    margin: 0 0 var(--space-md) 0;
    letter-spacing: -0.02em;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

p {
    margin: 0 0 var(--space-md) 0;
}

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

a:hover {
    color: var(--color-secondary);
}

code, pre {
    font-family: var(--font-mono);
    font-size: 0.875em;
}

pre {
    background: #f5f5f5;
    padding: var(--space-md);
    overflow-x: auto;
    border: var(--border-width) solid var(--color-border);
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-fluid {
    padding: 0 var(--space-lg);
}

/* Grid layouts */
.grid {
    display: grid;
    gap: var(--space-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
}

/* Flexbox utilities */
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

/* Spacing utilities */
.m-0 { margin: 0; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.p-0 { padding: 0; }
.p-sm { padding: var(--space-sm); }
.p-md { padding: var(--space-md); }
.p-lg { padding: var(--space-lg); }
.p-xl { padding: var(--space-xl); }

/* Text utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-muted); }
.text-error { color: var(--color-error); }
.text-success { color: var(--color-success); }
.text-sm { font-size: 0.875rem; }
.text-lg { font-size: 1.125rem; }
.font-mono { font-family: var(--font-mono); }
.font-bold { font-weight: 600; }
.uppercase { text-transform: uppercase; letter-spacing: 0.05em; }

/* Visibility */
.hidden { display: none !important; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}