/* ═══════════════════════════════════════════════════════════════════
   AI development — the page's three diagrams

   Hand-written, loaded on /ai-development/ only (inc/assets.php). Markup
   in template-parts/ai/, motion in src/ai.js. Every value is a token from
   main.css. With no script, each diagram is a still, complete drawing;
   the motion only ever adds to what is already there.

     .flow   the hero: one item followed through five stages (on stone)
     .xp     01: the before-and-after explorer (on ink)
     .anat   beside 03: anatomy of one answer (on ink)
   ═══════════════════════════════════════════════════════════════════ */

/* ── Flow: one item, followed through ─────────────────────────────── */

.flow {
    display: grid;
    gap: var(--s4);
    margin: var(--s6) 0 0;
    padding-top: var(--s5);
    border-top: 1px solid var(--rule);
}

.flow__cap { display: grid; gap: var(--s2); color: var(--ink-2); }
.flow__cap b { color: var(--ink); font-variation-settings: "wdth" 87.5, "wght" 600; }

/* The item that has arrived. */
.flow__card {
    display: grid;
    gap: .3rem;
    padding: .75rem .9rem;
    border: 1px solid var(--rule);
    border-left: 2px solid var(--mark);
    border-radius: var(--radius);
    background: var(--stone-hi);
    box-shadow: var(--lift-2);
    transition: opacity .35s var(--ease), transform .5s var(--ease-out);
}
.flow__src { color: var(--mark-ink); font-variation-settings: "wdth" 87.5, "wght" 600; }
.flow__from { font-size: var(--t-small); color: var(--ink); line-height: 1.4; }
.flow[data-phase="out"] .flow__card { opacity: 0; transform: translateY(-.5rem); }
.flow[data-phase="in"] .flow__card { opacity: 0; transform: translateY(.5rem); transition: none; }

/* The stages, down a spine that fills as the item passes. */
.flow__stages {
    position: relative;
    display: grid;
    margin: 0;
    padding: 0;
    list-style: none;
}
.flow__stages::before,
.flow__stages::after {
    content: "";
    position: absolute;
    left: calc(.45rem - .5px);
    top: 1.15rem;
    bottom: 1.15rem;
    width: 1px;
    background: var(--rule);
}
.flow__stages::after {
    background: var(--mark);
    transform: scaleY(var(--p, 0));
    transform-origin: top;
    transition: transform .6s var(--ease-out);
}

.flow__stage {
    position: relative;
    display: grid;
    grid-template-columns: .9rem 5.25rem minmax(0, 1fr);
    align-items: baseline;
    gap: .2rem .8rem;
    padding: .55rem 0;
}
.flow__node {
    position: relative;
    z-index: 1;
    align-self: center;
    width: .9rem;
    height: .9rem;
    border: 1px solid var(--ink-3);
    border-radius: 50%;
    background: var(--stone);
    transition: background-color .3s var(--ease), border-color .3s var(--ease), box-shadow .4s var(--ease);
}
.flow__name { color: var(--ink-3); transition: color .3s var(--ease); }
.flow__what {
    min-width: 0;
    min-height: 1.35em;
    font-size: var(--t-small);
    line-height: 1.35;
    color: var(--ink-2);
    transition: opacity .3s var(--ease);
}
.flow__json {
    grid-column: 2 / -1;
    display: block;
    min-height: 2.6em;
    margin-top: .35rem;
    padding: .55rem .7rem;
    border-radius: var(--radius);
    background: var(--ink);
    color: var(--on-ink);
    font-family: var(--mono);
    font-size: .6875rem;
    line-height: 1.55;
    letter-spacing: .01em;
    overflow-wrap: anywhere;
}
/* The caret while the reading types out. */
.flow__json[data-typing]::after {
    content: "";
    display: inline-block;
    width: .45em;
    height: 1em;
    margin-left: 1px;
    vertical-align: -.15em;
    background: var(--mark-lit);
    animation: ai-caret .8s steps(1) infinite;
}

/* Lit: the stage the item is at, and those it has passed. */
.flow__stage[data-on] .flow__node { background: var(--mark); border-color: var(--mark); box-shadow: 0 0 0 4px var(--mark-wash); }
.flow__stage[data-on] .flow__name { color: var(--ink); }
.flow__stage[data-now] .flow__node { box-shadow: 0 0 0 4px var(--mark-wash), 0 0 0 9px #dd53200d; }

/* The ending: finished, or a person's turn. */
.flow[data-end="human"] .flow__stage:last-child .flow__node { background: var(--stone-hi); border: 2px solid var(--mark); }
.flow[data-end] .flow__stage:last-child .flow__what { color: var(--ink); font-weight: 600; }
.flow[data-end="human"] .flow__stage:last-child .flow__what { color: var(--mark-ink); }

.flow__tally { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem .6rem; margin: 0; color: var(--ink-3); }
.flow__tally span { color: var(--ink); font-variation-settings: "wdth" 87.5, "wght" 600; }
.flow__tally i { width: 1px; height: .8rem; background: var(--rule); }
.js-ok .flow:not([data-live]) .flow__tally { visibility: hidden; }

@keyframes ai-caret { 50% { opacity: 0; } }

/* ── Explorer: five workflows, before and after ───────────────────── */

.uses__intro { margin-bottom: var(--s7); }
.uses__intro a { color: var(--on-ink); text-decoration-color: var(--mark-lit); text-underline-offset: .2em; }
.uses__intro a:hover { color: var(--mark-lit); }
.uses__intro em { color: var(--mark-lit); font-style: normal; }

/* Without the script: every workflow, one after another. */
.xp__panels { display: grid; gap: var(--s5); }

.xp[data-ready] {
    display: grid;
    grid-template-columns: minmax(0, 14rem) minmax(0, 1fr);
    align-items: start;
    gap: clamp(1.5rem, 4vw, 3.5rem);
}
.xp[data-ready] .xp__panel[hidden] { display: none; }

/* The tabs: a numbered list, the running one timed by a line along its foot. */
.xp__tabs { position: sticky; top: 6.5rem; display: grid; border-top: 1px solid var(--rule-ink); }
.xp__tab {
    position: relative;
    display: grid;
    grid-template-columns: 2rem minmax(0, 1fr);
    align-items: center;
    gap: .5rem;
    padding: 1rem 0;
    border: 0;
    border-bottom: 1px solid var(--rule-ink);
    background: none;
    color: var(--on-ink-2);
    font: inherit;
    font-size: 1.0625rem;
    text-align: left;
    cursor: pointer;
    transition: color .25s var(--ease), padding-left .35s var(--ease-out);
}
.xp__tab:hover { color: var(--on-ink); }
.xp__tab-n { color: var(--on-ink-3); }
.xp__tab[aria-selected="true"] { color: var(--on-ink); padding-left: .4rem; }
.xp__tab[aria-selected="true"] .xp__tab-n { color: var(--mark-lit); }
.xp__tab:focus-visible { outline: 2px solid var(--mark-lit); outline-offset: 2px; }
.xp__tab-time {
    position: absolute;
    left: 0;
    right: 0;
    bottom: -1px;
    height: 1px;
    background: var(--mark-lit);
    transform: scaleX(var(--t, 0));
    transform-origin: left;
}
.xp__tab[aria-selected="true"] .xp__tab-time { height: 2px; }

.xp__panel {
    padding: clamp(1.25rem, 3vw, 2.25rem);
    border: 1px solid var(--rule-ink);
    border-radius: 10px;
    background: #1b1d21;
    box-shadow: 0 30px 70px -40px #000c;
}

.xp__head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: var(--s3) var(--s5); }
.xp__name {
    margin: 0;
    font-family: var(--display);
    font-variation-settings: "wdth" 88, "wght" 560;
    font-size: clamp(1.4rem, 2.2vw, 1.85rem);
    letter-spacing: -.02em;
    color: var(--on-ink);
}
.xp__name .label { margin-right: .35rem; color: var(--mark-lit); vertical-align: .35em; }
.xp__when { display: inline-flex; align-items: center; gap: .55rem; margin: 0; color: var(--on-ink-2); }
.xp__when i { width: .45rem; height: .45rem; border-radius: 50%; background: var(--mark-lit); animation: ai-ping 2.4s var(--ease) infinite; }

.xp__cols {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 2.75rem minmax(0, 1fr);
    margin-top: var(--s6);
}
.xp__col-h { margin: 0 0 var(--s3); color: var(--on-ink-3); }
.xp__col-h--you { margin-top: var(--s5); color: var(--mark-lit); }

.xp__steps { display: grid; gap: .5rem; margin: 0; padding: 0; list-style: none; }
.xp__step {
    position: relative;
    display: grid;
    grid-template-columns: 1.15rem minmax(0, 1fr);
    align-items: start;
    gap: .6rem;
    padding: .6rem .75rem;
    border: 1px solid var(--rule-ink);
    border-radius: 6px;
    background: #16171a;
    color: var(--on-ink-2);
    font-size: .9375rem;
    line-height: 1.4;
}

/* Who does the step: a person (hollow), the system (a spark), you (a tick). */
.xp__who { display: grid; place-items: center; width: 1.15rem; height: 1.15rem; margin-top: .05rem; }
.xp__who::before { content: ""; width: .6rem; height: .6rem; border: 1px solid var(--on-ink-3); border-radius: 50%; }
.xp__step--ai { color: var(--on-ink); }
.xp__step--ai .xp__who::before {
    width: .75rem;
    height: .75rem;
    border: 0;
    border-radius: 0;
    background: var(--mark-lit);
    clip-path: polygon(50% 0, 62% 38%, 100% 50%, 62% 62%, 50% 100%, 38% 62%, 0 50%, 38% 38%);
}
.xp__step--you { border-color: var(--mark-lit); color: var(--on-ink); background: #ff6a3312; }
.xp__step--you .xp__who::before {
    content: "✓";
    display: grid;
    place-items: center;
    width: 1.1rem;
    height: 1.1rem;
    border: 0;
    background: var(--mark-lit);
    color: var(--ink);
    font-size: .7rem;
    font-weight: 700;
}

/* A hand-done step the system has taken over: struck through, stepped back. */
.xp__col--before .xp__step::after {
    content: "";
    position: absolute;
    left: 2.4rem;
    right: .75rem;
    top: 50%;
    height: 1px;
    background: var(--mark-lit);
    transform: scaleX(0);
    transform-origin: left;
}

/* The sweep between the two columns. */
.xp__sweep { position: relative; display: grid; justify-items: center; }
.xp__sweep::before {
    content: "";
    position: absolute;
    top: 2rem;
    bottom: 0;
    width: 1px;
    background: linear-gradient(var(--rule-ink), var(--rule-ink)) center / 1px 100% no-repeat;
}
.xp__sweep::after {
    content: "→";
    position: absolute;
    top: 50%;
    left: 50%;
    z-index: 1;
    translate: -50% -50%;
    display: grid;
    place-items: center;
    width: 1.9rem;
    height: 1.9rem;
    border: 1px solid var(--rule-ink);
    border-radius: 50%;
    background: #1b1d21;
    color: var(--on-ink-2);
    font-size: .85rem;
}
.xp__sweep i {
    position: absolute;
    top: 2rem;
    left: 50%;
    width: 3px;
    height: 3.5rem;
    margin-left: -1.5px;
    border-radius: 2px;
    background: linear-gradient(transparent, var(--mark-lit));
    box-shadow: 0 0 14px #ff6a3399;
    opacity: 0;
}

.xp__foot {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--s4) var(--s5);
    margin-top: var(--s6);
    padding-top: var(--s5);
    border-top: 1px solid var(--rule-ink);
}
.xp__meter { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem 1rem; margin: 0; }
.xp__meter > .label { color: var(--on-ink-3); }
.xp__count { display: inline-flex; align-items: baseline; gap: .5rem; }
.xp__count b {
    font-family: var(--display);
    font-variation-settings: "opsz" 96, "wdth" 78, "wght" 560;
    font-size: 2.4rem;
    line-height: 1;
    color: var(--mark-lit);
    font-variant-numeric: tabular-nums;
}
.xp__count s { font-family: var(--mono); font-size: .875rem; color: var(--on-ink-3); }
.xp__bar { width: 9rem; height: 4px; border-radius: 2px; background: var(--rule-ink); overflow: hidden; }
.xp__bar i { display: block; height: 100%; width: calc(var(--to, 1) * 100%); background: var(--mark-lit); transition: width 1.1s var(--ease-out); }
.xp__stack { margin: 0; color: var(--on-ink-3); }

/* The play, once the script runs: hidden until their moment, then in. */
.xp[data-ready] .xp__panel .xp__col--before .xp__step,
.xp[data-ready] .xp__panel .xp__col--after .xp__step,
.xp[data-ready] .xp__panel .xp__col-h--you {
    transition: opacity .45s var(--ease) calc(var(--k, 0) * 90ms), transform .6s var(--ease-out) calc(var(--k, 0) * 90ms), color .4s var(--ease), border-color .4s var(--ease);
}
.xp[data-ready] .xp__panel .xp__col--before .xp__step::after { transition: transform .45s var(--ease-out) calc(var(--k, 0) * 110ms); }

.xp[data-ready] .xp__panel[data-state="before"] .xp__col--before .xp__step { opacity: 1; }
.xp[data-ready] .xp__panel[data-state="before"] .xp__col--after .xp__step,
.xp[data-ready] .xp__panel[data-state="before"] .xp__col-h--you,
.xp[data-ready] .xp__panel[data-state="sweep"] .xp__col--after .xp__step,
.xp[data-ready] .xp__panel[data-state="sweep"] .xp__col-h--you {
    opacity: 0;
    transform: translateX(.75rem);
    transition-delay: 0s;
}
.xp[data-ready] .xp__panel[data-state="enter"] .xp__col--before .xp__step { opacity: 0; transform: translateY(.4rem); transition: none; }
.xp[data-ready] .xp__panel[data-state="enter"] .xp__col--after .xp__step,
.xp[data-ready] .xp__panel[data-state="enter"] .xp__col-h--you { opacity: 0; transition: none; }

.xp[data-ready] .xp__panel:is([data-state="sweep"], [data-state="after"]) .xp__col--before .xp__step { color: var(--on-ink-3); border-color: #33363c80; }
.xp[data-ready] .xp__panel:is([data-state="sweep"], [data-state="after"]) .xp__col--before .xp__step::after { transform: scaleX(1); }
.xp[data-ready] .xp__panel[data-state="sweep"] .xp__sweep i { animation: ai-sweep 1s var(--ease-out) forwards; }

@keyframes ai-sweep {
    0% { opacity: 0; top: 2rem; }
    15% { opacity: 1; }
    85% { opacity: 1; }
    100% { opacity: 0; top: calc(100% - 3.5rem); }
}
@keyframes ai-ping {
    0% { box-shadow: 0 0 0 0 #ff6a3366; }
    70% { box-shadow: 0 0 0 .5rem #ff6a3300; }
    100% { box-shadow: 0 0 0 0 #ff6a3300; }
}

/* ── Anatomy: one answer, top to bottom and back ──────────────────── */

.anat {
    display: grid;
    gap: var(--s4);
    margin: 0;
    padding: var(--s5);
    border: 1px solid var(--rule-ink);
    border-radius: 10px;
    background: #1b1d21;
    box-shadow: 0 30px 70px -40px #000c;
}
.anat__cap { display: grid; gap: var(--s2); color: var(--on-ink-3); }
.anat__cap b { color: var(--on-ink); font-variation-settings: "wdth" 87.5, "wght" 600; }

.anat__q,
.anat__a {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: baseline;
    gap: .15rem .6rem;
    margin: 0;
    padding: .7rem .85rem;
    border: 1px dashed var(--rule-ink);
    border-radius: 6px;
    color: var(--on-ink);
    font-size: .9375rem;
    line-height: 1.4;
    transition: border-color .4s var(--ease), background-color .4s var(--ease), opacity .4s var(--ease);
}
.anat__q > .label,
.anat__a > .label { grid-column: 1 / -1; color: var(--on-ink-3); }
.anat__a { border-style: solid; }
.anat__tick {
    display: grid;
    place-items: center;
    width: 1.1rem;
    height: 1.1rem;
    border-radius: 50%;
    background: var(--mark-lit);
    color: var(--ink);
    font-size: .7rem;
    font-weight: 700;
}
.anat__tick::before { content: "✓"; }
.anat[data-q] .anat__q { border-color: var(--on-ink-2); background: #ffffff06; }
.anat[data-a] .anat__a { border-color: var(--mark-lit); background: #ff6a3310; }

.anat__body { position: relative; }
.anat__wire { position: absolute; left: 1.05rem; top: .5rem; bottom: .5rem; width: 1px; background: var(--rule-ink); }
.anat__pulse {
    position: absolute;
    left: -3.5px;
    top: var(--y, 0%);
    width: 8px;
    height: 8px;
    margin-top: -4px;
    border-radius: 50%;
    background: var(--mark-lit);
    box-shadow: 0 0 12px 2px #ff6a3399;
    opacity: 0;
    transition: top .55s var(--ease-out), opacity .3s var(--ease);
}
.anat[data-running] .anat__pulse { opacity: 1; }

.anat__stack { display: grid; gap: .45rem; margin: 0; padding: 0; list-style: none; }
.anat__layer {
    position: relative;
    display: grid;
    grid-template-columns: 2.1rem minmax(0, 1fr);
    gap: .2rem .55rem;
    padding: .65rem .8rem .65rem 0;
    border: 1px solid transparent;
    border-radius: 6px;
    transition: border-color .35s var(--ease), background-color .35s var(--ease);
}
.anat__n {
    grid-row: 1 / span 3;
    justify-self: center;
    align-self: start;
    position: relative;
    z-index: 1;
    padding: .15rem 0;
    background: #1b1d21;
    color: var(--on-ink-3);
    transition: color .3s var(--ease);
}
.anat__name {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .35rem .5rem;
    font-family: var(--display);
    font-variation-settings: "wdth" 90, "wght" 560;
    font-size: 1.05rem;
    color: var(--on-ink);
}
.anat__note { font-size: .8125rem; line-height: 1.45; color: var(--on-ink-3); }
.anat__layer[data-on] { border-color: var(--rule-ink); background: #ffffff06; }
.anat__layer[data-on] .anat__n { color: var(--mark-lit); }

.anat__model {
    display: inline-block;
    padding: .15rem .5rem;
    border: 1px solid var(--mark-lit);
    border-radius: 999px;
    color: var(--mark-lit);
    transition: opacity .25s var(--ease), transform .35s var(--ease-out);
}
.anat__model[data-swap] { opacity: 0; transform: translateY(-.35rem); }

/* Passages in the knowledge layer; the ones retrieved light up. */
.anat__chunks { display: flex; gap: 4px; margin-top: .35rem; }
.anat__chunks i { width: 1.35rem; height: .32rem; border-radius: 2px; background: var(--rule-ink); transition: background-color .3s var(--ease), box-shadow .3s var(--ease); }
.anat__chunks i[data-hit] { background: var(--mark-lit); box-shadow: 0 0 8px #ff6a3366; }

.anat__log { margin: 0; color: var(--on-ink-3); transition: opacity .4s var(--ease); }
.js-ok .anat:not([data-log]) .anat__log { opacity: .35; }

/* ── Small screens ────────────────────────────────────────────────── */

@media (max-width: 900px) {
    .xp[data-ready] { grid-template-columns: minmax(0, 1fr); }

    /* The tabs become a row that scrolls sideways. */
    .xp__tabs {
        position: static;
        display: flex;
        gap: var(--s2);
        margin-inline: calc(var(--gutter) * -1);
        padding: 0 var(--gutter) var(--s2);
        overflow-x: auto;
        border-top: 0;
        scrollbar-width: none;
    }
    .xp__tabs::-webkit-scrollbar { display: none; }
    .xp__tab {
        flex: none;
        grid-template-columns: auto auto;
        padding: .6rem .95rem;
        border: 1px solid var(--rule-ink);
        border-radius: 999px;
        font-size: .9375rem;
        overflow: hidden;
    }
    .xp__tab[aria-selected="true"] { padding-left: .95rem; border-color: var(--on-ink-2); background: #ffffff0a; }
    .xp__tab-time { left: .95rem; right: .95rem; bottom: .3rem; }
    .xp__tab[aria-selected="true"] .xp__tab-time { height: 1px; }

    /* The columns stack, the sweep between them turns to point down. */
    .xp__cols { grid-template-columns: minmax(0, 1fr); }
    .xp__sweep { height: 2.75rem; }
    .xp__sweep::before { top: 0; width: 1px; }
    .xp__sweep::after { content: "↓"; }
    .xp__sweep i { display: none; }
}

@media (max-width: 560px) {
    .flow__stage { grid-template-columns: .9rem minmax(0, 1fr); }
    .flow__what,
    .flow__json { grid-column: 2; }
    .xp__panel { padding: var(--s4); }
    .xp__foot { flex-direction: column; align-items: flex-start; }
}

/* ── Less motion: the final state of each drawing, and no loops ───── */

@media (prefers-reduced-motion: reduce) {
    .flow__card,
    .flow__stages::after,
    .anat__pulse,
    .anat__model,
    .xp__bar i { transition: none !important; }
    .xp__when i,
    .flow__json[data-typing]::after { animation: none; }
    .xp[data-ready] .xp__panel .xp__step,
    .xp[data-ready] .xp__panel .xp__col-h--you { transition: none !important; }
}