/* ============================================================
   BASE — Reset, typography, utilities
   Ian McGinn Portfolio — mid-fidelity
   ============================================================ */

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: var(--leading-base);
    color: var(--color-text-primary);
    background-color: var(--color-bg-base);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ── Focus ring — always visible, never suppress ── */
:focus-visible {
    outline: 2px solid var(--color-accent-primary);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
}

/* Remove default focus ring only for mouse users */
:focus:not(:focus-visible) {
    outline: none;
}

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 400;
    line-height: var(--leading-tight);
    color: var(--color-text-primary);
    letter-spacing: var(--tracking-tight);
}

h3, h4, h5, h6 {
    font-weight: 700;
}

h1 { font-size: var(--font-size-2xl); }
h2 { font-size: var(--font-size-xl); }
h3 { font-size: var(--font-size-md); }
h4 { font-size: var(--font-size-base); }

p {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: var(--leading-base);
    color: var(--color-text-secondary);
    max-width: var(--max-width-text);
}

p + p {
    margin-top: var(--space-4);
}

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

a {
    color: var(--color-accent-primary);
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    transition: color var(--duration-fast) var(--ease-default);
}

a:hover {
    color: var(--color-accent-primary-hover);
}

img, svg {
    display: block;
    max-width: 100%;
}

ul, ol {
    padding-left: var(--space-6);
}

li {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: var(--leading-base);
    color: var(--color-text-secondary);
}

/* ── Skip link ── */
.skip-link {
    position: absolute;
    top: 0;
    left: var(--space-4);
    z-index: 9999;
    padding: var(--space-3) var(--space-4);
    background: var(--color-accent-primary);
    color: var(--color-bg-base);
    font-family: var(--font-sans);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-decoration: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    transform: translateY(-100%);
    transition: transform var(--duration-fast) var(--ease-default);
}

.skip-link:focus {
    transform: translateY(0);
    outline: 2px solid var(--color-bg-base);
    outline-offset: -2px;
}

/* ── Layout ── */
.container {
    max-width: var(--max-width-wide);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.container--narrow {
    max-width: var(--max-width-content);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* ── Grid utilities ── */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}

.grid-3 {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}

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

/* ── Stack utility ── */
.stack {
    display: flex;
    flex-direction: column;
}

.stack--sm  { gap: var(--space-4); }
.stack--md  { gap: var(--space-6); }
.stack--lg  { gap: var(--space-8); }
.stack--xl  { gap: var(--space-12); }

/* ── Main content ── */
main {
    flex: 1;
}

/* ── Section dividers ── */
.section-divider {
    border: none;
    border-top: 1px solid var(--color-border-subtle);
    margin: var(--space-section-md) 0;
}

/* ── Small-caps label utility ── */
.label {
    font-family: var(--font-sans);
    font-size: var(--font-size-xs);
    font-weight: 600;
    letter-spacing: var(--tracking-caps);
    text-transform: uppercase;
    color: var(--color-text-muted);
    display: block;
}

/* ── Highlight chip ── */
.highlight {
    background: var(--color-accent-highlight-bg);
    color: var(--color-accent-highlight-text);
    padding: 0.1em 0.4em 0.15em;
    border-radius: 3px;
    font-style: normal;
}

/* ── Reading column ── */
.reading-column {
    max-width: var(--max-width-text);
}

/* ── Visually hidden (accessible hide) ── */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
}

/* ── Image placeholder blocks ── */
.img-placeholder {
    background: var(--color-bg-elevated);
    /* FIX SC 1.4.11: border-default fails 3:1 against both bg-elevated (inner) and
       the surrounding bg (outer). border-ui passes 3:1 against all bg contexts. */
    border: 1px solid var(--color-border-ui);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    /* FIX SC 1.4.3: text-muted (4.14:1 on bg-elevated) fails for normal-size text.
       text-secondary gives 8.38:1 on bg-elevated — PASS. */
    color: var(--color-text-secondary);
    font-family: var(--font-sans);
    font-size: var(--font-size-xs);
    font-weight: 500;
    letter-spacing: var(--tracking-wide);
    text-align: center;
    padding: var(--space-4);
}

.img-placeholder--hero  { min-height: 280px; }
.img-placeholder--md    { min-height: 220px; }
.img-placeholder--sm    { min-height: 140px; }
.img-placeholder--proto { min-height: 380px; }
.img-placeholder--video { min-height: 200px; }

.img-placeholder--avatar {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    flex-shrink: 0;
}

.img-placeholder--avatar-sm {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* ── Breadcrumb ── */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-family: var(--font-sans);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-bottom: var(--space-6);
}

.breadcrumb a {
    color: var(--color-text-muted);
    text-decoration: none;
}

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

.breadcrumb__sep {
    color: var(--color-text-disabled);
}

/* ── Details/summary ── */
details summary {
    cursor: pointer;
    font-family: var(--font-sans);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    padding: var(--space-2) 0;
    list-style: none;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

details summary::-webkit-details-marker {
    display: none;
}

details summary::before {
    content: '+';
    font-family: var(--font-sans);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    width: 1.25em;
    transition: transform var(--duration-fast) var(--ease-default);
}

details[open] summary::before {
    content: '−';
}

details[open] summary {
    color: var(--color-text-primary);
}

details .details-body {
    padding: var(--space-4) 0 var(--space-2);
    max-width: var(--max-width-text);
}

/* ============================================================
   ACCESSIBILITY ENHANCED MODE
   Class applied to <html> by a11y-mode.js
   ============================================================ */

/* Hide decorative elements */
.a11y-enhanced .decorative,
.a11y-enhanced [data-decorative] {
    display: none !important;
}

/* Zero all animation and transitions */
.a11y-enhanced *,
.a11y-enhanced *::before,
.a11y-enhanced *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
}

/* Switch body prose to sans-serif */
.a11y-enhanced body,
.a11y-enhanced p,
.a11y-enhanced li,
.a11y-enhanced .cs-section__body,
.a11y-enhanced .writing-list__title {
    font-family: var(--font-sans) !important;
}

/* Reveal BSL video elements (hidden by default) */
.bsl-video {
    display: none;
}

.a11y-enhanced .bsl-video {
    display: block;
}