:root {
    --color-primary: #0f172a;
    --color-primary-hover: #334155;
    --color-success: #10b981;
    --color-danger: #ef4444;
    --color-danger-hover: #b91c1c;
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #0f172a;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;

    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 3rem;

    --border-radius: 0.5rem;
    /* Apple HIG minimum; used for iPad/touch administration controls */
    --touch-target: 2.75rem;

    --font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--font-family), sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
}

h1, h2, h3, h4, h5, h6 {
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--color-text);
}

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

a:hover {
    text-decoration: underline;
}

/* Fallback for remaining HRs */
hr {
    border: 0;
    border-top: 1px solid var(--color-border);
    margin: var(--spacing-xl) 0;
}

img {
    max-width: 100%;
    height: auto;
}