article {
    font-family: var(--font-sans);
    font-size: var(--font-size-md);
    line-height: 1.7;
    color: var(--color-text-primary);
}
article h1, article h2, article h3, article h4 {
    color: var(--color-primary);
    line-height: 1.25;
    margin-bottom: var(--spacing-md);
    scroll-margin-top: var(--spacing-md);
    font-weight: 650;
    letter-spacing: -0.01em;
}
article h1 {
    font-size: 1.875rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--spacing-sm);
    margin-top: 0;
}
article h2 {
    font-size: 1.375rem;
    margin-top: var(--spacing-2xl);
}
article h3 {
    font-size: 1.0625rem;
    margin-top: var(--spacing-xl);
}
article h4 {
    font-size: 0.9375rem;
    margin-top: var(--spacing-lg);
}
article p { margin: var(--spacing-md) 0; }
article img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: var(--spacing-md) 0;
    border-radius: var(--radius-sm);
}
article a {
    color: inherit;
    text-decoration: underline;
    text-decoration-color: var(--color-text-tertiary);
    text-underline-offset: 0.2em;
    text-decoration-thickness: 0.0625rem;
}
article a:hover {
    color: var(--color-primary);
    text-decoration-color: var(--color-primary);
}
article code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--color-base-300);
    color: var(--color-text-primary);
    padding: 0.1em 0.35em;
    border-radius: var(--radius-sm);
}
article pre {
    background: var(--color-base-200);
    border: 1px solid var(--color-border-strong);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    line-height: 1.55;
    margin: var(--spacing-lg) 0;
}
article pre code {
    background: none;
    color: inherit;
    padding: 0;
    font-size: inherit;
}
article blockquote {
    border-left: 3px solid var(--color-primary);
    margin: var(--spacing-md) 0;
    padding: var(--spacing-2xs) var(--spacing-md);
    color: var(--color-text-tertiary);
}
article table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-md) 0;
    font-size: var(--font-size-sm);
}
article th, article td {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}
article tr:nth-child(even) td {
    background: color-mix(in oklch, var(--color-base-200) 60%, transparent);
}
article th {
    color: var(--color-text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    font-size: var(--font-size-2xs);
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--color-border-strong);
}
article ul, article ol {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-xl);
}
article li { margin: var(--spacing-2xs) 0; }
article hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--spacing-2xl) 0;
}

article .callout {
    margin: var(--spacing-md) 0;
    padding: var(--spacing-sm) var(--spacing-md);
    border-left: 3px solid var(--color-text-tertiary);
    background: color-mix(in oklch, var(--color-base-200) 70%, transparent);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
article .callout-note {
    border-left-color: var(--color-info);
    background: color-mix(in oklch, var(--color-info) 7%, transparent);
}
article .callout-tip {
    border-left-color: var(--color-success);
    background: color-mix(in oklch, var(--color-success) 7%, transparent);
}
article .callout-warn {
    border-left-color: var(--color-warning);
    background: color-mix(in oklch, var(--color-warning) 7%, transparent);
}
article .callout-title {
    display: block;
    font-weight: 700;
    font-size: var(--font-size-2xs);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: var(--spacing-2xs);
    color: var(--color-text-secondary);
}

.d2-diagram {
    margin: var(--spacing-xl) 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
}
.d2-diagram svg {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 0 auto;
}

/* Iteration-flow diagram (hand-authored SVG, themed via CSS vars). */
.iter-flow {
    display: block;
    max-width: 42.1875rem;
    width: 100%;
    height: auto;
    margin: var(--spacing-xl) auto;
    font-family: var(--font-sans);
}
.iter-flow .iter-frame rect {
    fill: var(--color-base-200);
    stroke: var(--color-border-strong);
    stroke-width: 1;
}
.iter-flow .iter-frame-sep {
    stroke: var(--color-border);
    stroke-width: 1;
}
.iter-flow .iter-frame-label {
    fill: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.14em;
}
.iter-flow .iter-cluster rect {
    fill: var(--color-base-300);
    stroke: var(--color-border);
    stroke-width: 1;
}
.iter-flow .iter-cluster-sep {
    stroke: var(--color-border);
    stroke-width: 1;
}
.iter-flow .iter-cluster-mark {
    color: var(--color-text-tertiary);
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}
.iter-flow .iter-cluster-label {
    fill: var(--color-text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.18em;
}
.iter-flow .iter-cluster-sub {
    fill: var(--color-text-tertiary);
    fill-opacity: 0.6;
    font-size: 0.6875rem;
}
/* Cluster nodes (the platform's compute services) */
.iter-flow .iter-node rect {
    fill: var(--color-base-300);
    stroke: var(--color-border-strong);
    stroke-width: 1;
}
.iter-flow .iter-node .iter-icon {
    color: var(--color-text-secondary);
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}
/* Hub: rship gets primary tint */
.iter-flow .iter-node.iter-hub rect {
    fill: color-mix(in oklch, var(--color-primary) 14%, var(--color-base-300));
    stroke: var(--color-primary);
}
.iter-flow .iter-node.iter-hub .iter-icon {
    color: var(--color-primary);
}
/* Physical-world nodes (sources + outputs, outside cluster): heavier border */
.iter-flow .iter-node.iter-source rect,
.iter-flow .iter-node.iter-output rect {
    fill: var(--color-base-200);
    stroke: var(--color-text-tertiary);
    stroke-width: 1.5;
}
.iter-flow .iter-node.iter-source .iter-icon,
.iter-flow .iter-node.iter-output .iter-icon {
    color: var(--color-text-primary);
}
/* Labels (stacked layout: icon above, label centered below) */
.iter-flow .iter-label {
    fill: var(--color-text-primary);
    font-size: 0.8125rem;
    font-weight: 500;
    text-anchor: middle;
    dominant-baseline: central;
}
.iter-flow .iter-sublabel {
    fill: var(--color-text-tertiary);
    font-size: 0.625rem;
    text-anchor: middle;
    dominant-baseline: central;
}
/* Edges */
.iter-flow .iter-edges path,
.iter-flow .iter-edges line {
    fill: none;
    stroke: var(--color-text-tertiary);
    stroke-width: 1.25;
    stroke-opacity: 0.75;
}
.iter-flow #iter-arr path {
    fill: var(--color-text-tertiary);
}
.iter-flow .iter-edge-labels text {
    fill: var(--color-text-secondary);
    font-size: 0.625rem;
    paint-order: stroke;
    stroke: var(--color-base-200);
    stroke-width: 0.25rem;
    stroke-linejoin: round;
}

/* DEBUG — keyframe sanity test. Loaded via external stylesheet, bypassing
   Leptos's <style> injection. If this animates but the heros don't, the
   issue is the inline style pipeline. */
.hero-debug-external {
    width: 5rem;
    height: 5rem;
    background: lime;
    animation: hero-debug-external-flash 1s ease-in-out infinite;
}
@keyframes hero-debug-external-flash {
    0%, 100% { transform: scale(0.4); background: lime; }
    50%      { transform: scale(1.2); background: magenta; }
}