/* =============================================================================
   Monochrome — Base
   Tokens, resets, dark-mode helpers.
   ============================================================================= */

:root {
    color-scheme: light;
}

/* Dark mode auto when body has color-mode-auto and user prefers dark */
@media (prefers-color-scheme: dark) {
    body.color-mode-auto {
        --mono-bg: #000000;
        --mono-surface: #111113;
        --mono-text: #f5f5f7;
        --mono-muted: #86868b;
        --mono-border: #1c1c1e;
        color-scheme: dark;
    }
}

/* Forced dark mode */
body.color-mode-dark,
body[data-theme="dark"] {
    --mono-bg: #000000;
    --mono-surface: #111113;
    --mono-text: #f5f5f7;
    --mono-muted: #86868b;
    --mono-border: #1c1c1e;
    color-scheme: dark;
}

body[data-theme="light"] {
    --mono-bg: #ffffff;
    --mono-surface: #f5f5f7;
    --mono-text: #1d1d1f;
    --mono-muted: #86868b;
    --mono-border: #e5e5ea;
    color-scheme: light;
}

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

html {
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    text-rendering: optimizeLegibility;
}

body {
    margin: 0;
    font-family: var(--mono-font-sans);
    font-size: var(--mono-font-size-base);
    line-height: 1.6;
    color: var(--mono-text);
    background: var(--mono-bg);
    min-height: 100dvh;
    overflow-x: hidden;
    transition: background-color .25s var(--mono-easing), color .25s var(--mono-easing);
}

img, picture, svg, video { max-width: 100%; height: auto; display: block; }
img { font-style: italic; background-repeat: no-repeat; background-size: cover; shape-margin: .75rem; }
svg { flex-shrink: 0; }

a { color: inherit; text-decoration: none; }
a:hover, a:focus-visible { color: var(--mono-muted); }

button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }

input, textarea, select, button { font: inherit; color: inherit; }

hr {
    border: 0;
    height: 1px;
    background: var(--mono-border);
    margin: 2.5rem 0;
}

::selection {
    background: var(--mono-text);
    color: var(--mono-bg);
}

/* Focus ring — Bootstrap-style accent glow.
   Applied broadly via :focus-visible to keep it keyboard-only and accessible. */
:root {
    --mono-focus-ring-color: rgba(0, 113, 227, .25);
    --mono-focus-ring: 0 0 0 .25rem var(--mono-focus-ring-color);
}
@supports (background: color-mix(in srgb, red, blue)) {
    :root { --mono-focus-ring-color: color-mix(in srgb, var(--mono-accent, #0071e3) 30%, transparent); }
}
body[data-theme="dark"],
body.color-mode-dark {
    --mono-focus-ring-color: rgba(10, 132, 255, .35);
}
@supports (background: color-mix(in srgb, red, blue)) {
    body[data-theme="dark"],
    body.color-mode-dark {
        --mono-focus-ring-color: color-mix(in srgb, var(--mono-accent, #0a84ff) 45%, transparent);
    }
}

:focus-visible {
    outline: 2px solid var(--mono-text);
    outline-offset: 3px;
    border-radius: var(--mono-radius-sm);
}

/* Density modifiers */
.density-compact     { --mono-section-pad: 2rem; --mono-card-pad: 1.25rem; }
.density-comfortable { --mono-section-pad: 4rem; --mono-card-pad: 1.75rem; }
.density-spacious    { --mono-section-pad: 6rem; --mono-card-pad: 2.25rem; }

/* Container */
.container {
    width: 100%;
    max-width: var(--mono-container, 1200px);
    margin-inline: auto;
    padding-inline: clamp(1rem, 3vw, 2rem);
}

/* Layout modes */
.layout-boxed  #page { overflow-x: clip; }
.layout-wide   .container { max-width: 1400px; }
.layout-full   .container { max-width: 100%; padding-inline: clamp(1rem, 4vw, 3rem); }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Skip link visibility */
.skip-link {
    position: absolute; top: -40px; left: 0;
    z-index: 9999;
    background: var(--mono-text); color: var(--mono-bg);
    padding: .5rem 1rem;
    border-radius: 0 0 var(--mono-radius-sm) 0;
}
.skip-link:focus { top: 0; }