/* ==========================================================================
   how it works · #how (CONTENT.md §3). Every rule is scoped under #how.
   Request card -> teammate (four steps over a particle field) -> result card.
   The diagram's state lives in [data-step] on .hw-grid (1 Ask, 2 Add context,
   3 Review the plan, 4 Get the result). Markup ships in state 4, which is the
   calm, complete picture shown without JS and with reduced motion.
   Connector lines are drawn by js/how.js from the real card geometry.
   Palette: apricot accent, violet = working, gold (--ok) = done. No green/teal.
   Three-column diagram from 1181px; stacked below that.
   ========================================================================== */
#how{
  --hw-card:#232221;      /* raised card */
  --hw-raise:#2c2a28;     /* bubble / chip fill */
  --hw-tile:#3d3835;      /* avatar tile */
  --hw-line:#3a3936;      /* hairlines, rails, idle borders */
  --hw-line-2:#56504b;    /* hover borders */
  --hw-body:#b5aca5;      /* body copy */
  --hw-dim:#7a7773;       /* idle numbers, pending rings */
  --hw-glass:rgba(24,24,24,.84);
  position:relative;
  overflow:hidden;
  background:var(--bg);
  color:var(--fg);
  padding:clamp(88px,10vw,152px) 0 clamp(80px,9vw,136px);
}
#how .hw-mono{font-family:var(--font-mono);font-weight:500;font-size:12px;line-height:1.25;letter-spacing:.04em;text-transform:uppercase;color:var(--taupe)}

/* ---------- header ---------- */
#how .hw-head{display:grid;grid-template-columns:minmax(0,1fr);row-gap:20px}
#how .hw-line{display:block}
#how .hw-lede{max-width:40ch;font-size:16px;line-height:1.55;color:var(--hw-body)}
@media (min-width:1025px){
  #how .hw-head{grid-template-columns:repeat(12,minmax(0,1fr));column-gap:24px;row-gap:0;align-items:end}
  #how .hw-title{grid-column:1 / span 7}
  #how .hw-lede{grid-column:9 / span 4;max-width:36ch;font-size:17px;padding-bottom:.35em}
}

/* ---------- figure / grid (stacked, mobile first) ---------- */
#how .hw-figure{display:block;margin-top:clamp(48px,6vw,88px)}
#how .hw-grid{position:relative;isolation:isolate;display:flex;flex-direction:column;max-width:560px;margin:0 auto}
#how .hw-label{display:flex;justify-content:center;text-align:center;font-family:var(--font-mono);font-weight:500;font-size:12px;line-height:1;letter-spacing:.06em;text-transform:uppercase;color:var(--taupe)}
#how .hw-label--in{order:1}
#how .hw-label--mid{display:none}
#how .hw-label--out{order:4;margin-top:76px}
#how .hw-rule{display:none}
#how .hw-col{position:relative;min-width:0}
#how .hw-col--in{order:2;margin-top:16px}
#how .hw-col--mid{order:3;margin-top:84px}
#how .hw-col--out{order:5;margin-top:16px}
#how .hw-foot-fig{order:6;display:flex;align-items:center;justify-content:center;gap:16px;min-height:32px;margin-top:20px}

/* wires (svg is sized/filled by JS) */
#how .hw-wire{position:absolute;left:0;top:0;width:100%;height:100%;z-index:0;overflow:visible;pointer-events:none}
#how .hw-rail{fill:none;stroke:#6b635c;stroke-width:1.25;transition:stroke .6s var(--ease)}
#how .hw-orbit{fill:none;stroke-linecap:round}
#how .hw-grid:is([data-step="1"],[data-step="2"]) .hw-rail--in{stroke:rgba(255,143,90,.6)}
#how .hw-grid[data-step="4"] .hw-rail--out{stroke:rgba(255,143,90,.75)}

/* ---------- cards ---------- */
#how .hw-card{position:relative;z-index:2;display:flex;flex-direction:column;width:100%;padding:20px 22px 22px;border-radius:var(--r);
  background:var(--hw-card);box-shadow:inset 0 0 0 1px rgba(234,227,221,.05),0 24px 48px -24px rgba(0,0,0,.6)}
#how .hw-illus{position:absolute;top:16px;right:18px;font-size:12px;letter-spacing:.06em;line-height:1;color:var(--taupe)}
#how .hw-card__head{display:flex;align-items:center;gap:14px;min-height:40px}
#how .hw-card__id{display:flex;flex-direction:column;gap:6px;min-width:0}
#how .hw-card__title{font-family:var(--font-display);font-size:17px;line-height:1.15;font-weight:600;letter-spacing:-.005em;color:var(--fg)}
#how .hw-avatar{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:36px;height:36px;border-radius:var(--r);background:var(--hw-tile);
  color:var(--accent);font-size:12px;font-weight:600;letter-spacing:.02em}
#how .hw-mark{flex-shrink:0;width:36px;height:36px}
#how .hw-mark svg{width:100%;height:100%}
#how .hw-mark__bg{fill:var(--accent)}
#how .hw-mark__l{fill:none;stroke:var(--accent-ink);stroke-width:3.6;stroke-linecap:round;stroke-linejoin:round}
#how .hw-mark__o{fill:var(--accent-ink)}
#how .hw-sub{margin:22px 0 10px}

/* request bubble */
#how .hw-bubble{margin-top:18px;padding:13px 15px;border:1px solid transparent;border-radius:12px 12px 12px 4px;background:var(--hw-raise);
  font-size:15px;line-height:1.45;color:var(--fg);transition:border-color .5s var(--ease),box-shadow .5s var(--ease)}
#how .hw-grid[data-step="1"] .hw-bubble{border-color:rgba(255,143,90,.7);box-shadow:0 0 0 4px var(--accent-soft)}

/* context chips */
#how .hw-ctx{display:flex;flex-direction:column;gap:8px}
#how .hw-chip{display:flex;align-items:center;gap:10px;height:42px;padding:0 10px 0 12px;border:1px solid var(--hw-line);border-radius:var(--r);
  color:var(--hw-dim);transition:border-color .45s var(--ease),background-color .45s var(--ease),color .45s var(--ease)}
#how .hw-chip__ic{display:flex;flex-shrink:0;width:16px;height:16px;transition:color .45s var(--ease)}
#how .hw-chip__ic svg{width:100%;height:100%}
#how .hw-chip__t{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:14px;line-height:1.2}
#how .hw-chip__v{margin-left:auto;white-space:nowrap;color:inherit}
#how .hw-chip__ok{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:16px;height:16px;border-radius:50%;background:var(--ok);color:var(--accent-ink);
  transform:scale(0);transition:transform .45s var(--ease-out)}
#how .hw-chip__ok svg{width:10px;height:10px}
#how .hw-grid:is([data-step="2"],[data-step="3"],[data-step="4"]) .hw-chip{border-color:#46413d;background:var(--hw-raise);color:var(--fg)}
#how .hw-grid:is([data-step="2"],[data-step="3"],[data-step="4"]) .hw-chip__ic{color:var(--accent)}
#how .hw-grid:is([data-step="2"],[data-step="3"],[data-step="4"]) .hw-chip__v{color:var(--taupe)}
#how .hw-grid:is([data-step="2"],[data-step="3"],[data-step="4"]) .hw-chip__ok{transform:scale(1)}
#how .hw-grid[data-step="2"] .hw-chip,
#how .hw-grid[data-step="2"] .hw-chip :is(.hw-chip__ic,.hw-chip__ok){transition-delay:calc(var(--i) * 260ms + 180ms)}

/* result card */
#how .hw-status{display:grid;height:12px}
#how .hw-status__s{grid-area:1 / 1;display:inline-flex;align-items:center;gap:6px;transition:opacity .25s var(--ease)}
#how .hw-status__s--work,#how .hw-grid[data-step="4"] .hw-status__s--done{transition-delay:.22s}
#how .hw-grid[data-step="4"] .hw-status__s--work{transition-delay:0s}
#how .hw-status__s .status-sq{--status-c:currentColor} /* status symbol: working = violet, ready = gold */
#how .hw-status__s--work{color:var(--violet)}
#how .hw-status__s--done{color:var(--ok);opacity:0}
#how .hw-grid[data-step="4"] .hw-status__s--work{opacity:0}
#how .hw-grid[data-step="4"] .hw-status__s--done{opacity:1}
#how .hw-grid.is-playing:not([data-step="4"]) .hw-status__s--work .status-sq{animation:hw-blink 1.4s var(--ease) infinite}

#how .hw-out{display:flex;flex-direction:column}
#how .hw-row{display:flex;align-items:flex-start;gap:12px;padding:13px 0;border-top:1px solid var(--hw-line);transition:opacity .5s var(--ease)}
#how .hw-row:last-child{padding-bottom:0}
#how .hw-row__body{display:flex;flex-direction:column;align-items:flex-start;gap:5px;min-width:0}
#how .hw-row__t{font-size:15px;line-height:1.25;font-weight:500;color:var(--fg);transition:color .4s var(--ease)}
#how .hw-row__v{color:var(--taupe)}
#how .hw-tick{display:flex;flex-shrink:0;width:18px;height:18px;margin-top:0}
#how .hw-tick svg{width:100%;height:100%;overflow:visible}
#how .hw-tick__ring{fill:none;stroke:var(--hw-dim);stroke-width:1.3;transition:fill .4s var(--ease),stroke .4s var(--ease)}
#how .hw-tick__spin{fill:none;stroke:var(--violet);stroke-width:1.6;stroke-linecap:round;stroke-dasharray:10 31;opacity:0;transform-box:fill-box;transform-origin:center;transition:opacity .3s var(--ease)}
#how .hw-tick__mark{fill:none;stroke:var(--accent-ink);stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:10;stroke-dashoffset:10;transition:stroke-dashoffset .45s var(--ease-out) .12s}
#how .hw-tick__pause{fill:none;stroke:var(--violet);stroke-width:1.5;stroke-linecap:round}
#how .hw-tick--wait .hw-tick__ring{stroke:rgba(155,156,255,.6)}
/* rows a,b: pending (1-2) -> working (3) -> done (4) */
#how .hw-grid:is([data-step="1"],[data-step="2"]) :is(.hw-row--a,.hw-row--b) .hw-row__t{color:var(--hw-body)}
#how .hw-grid[data-step="3"] :is(.hw-row--a,.hw-row--b) .hw-tick__ring{stroke:rgba(155,156,255,.22)}
#how .hw-grid[data-step="3"] :is(.hw-row--a,.hw-row--b) .hw-tick__spin{opacity:1;animation:hw-spin .9s linear infinite}
#how .hw-grid[data-step="4"] :is(.hw-row--a,.hw-row--b) .hw-tick__ring{fill:var(--ok);stroke:var(--ok)}
#how .hw-grid[data-step="4"] :is(.hw-row--a,.hw-row--b) .hw-tick__mark{stroke-dashoffset:0}
#how .hw-grid[data-step="4"] .hw-row--b :is(.hw-tick__ring,.hw-tick__mark){transition-delay:.28s}
/* row c: waiting for approval from step 3 on */
#how .hw-grid:is([data-step="1"],[data-step="2"]) .hw-row--c{opacity:.38}
/* Approve: a real button. Waiting (steps 1-2, aria-disabled) -> ready (3-4) -> approved (gold) */
#how .hw-row__st--ok{display:none}
#how .hw-approve{position:relative;display:inline-flex;align-items:center;gap:6px;height:32px;margin-top:6px;padding:0 14px;border:1px solid transparent;border-radius:var(--r-sm);
  background:var(--accent);color:var(--accent-ink);font-family:var(--font-mono);font-weight:500;font-size:12px;line-height:1;letter-spacing:.05em;text-transform:uppercase;cursor:pointer;
  transition:background-color .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease),box-shadow .25s var(--ease),transform .2s var(--ease)}
#how .hw-approve::before{content:"";position:absolute;inset:-6px -4px}  /* 44px-ish touch target */
#how .hw-approve__ic{display:none;width:12px;height:12px}
#how .hw-approve:hover{background:var(--accent-hover);box-shadow:0 8px 20px -10px rgba(255,143,90,.7)}
#how .hw-approve:active{transform:translateY(1px)}
#how .hw-approve:focus-visible,#how .hw-approve[aria-disabled="true"]:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
#how .hw-approve[aria-disabled="true"]{background:var(--surface-2);color:var(--hw-dim);box-shadow:none;cursor:default;transform:none}
#how .hw-grid.is-playing:is([data-step="3"],[data-step="4"]):not([data-approved]) .hw-approve{animation:hw-glow 2.2s var(--ease) infinite}
/* approved */
#how .hw-grid[data-approved] .hw-approve,
#how .hw-grid[data-approved] .hw-approve:hover{background:rgba(255,210,138,.1);border-color:rgba(255,210,138,.55);color:var(--ok);box-shadow:none;cursor:default;transform:none}
#how .hw-grid[data-approved] .hw-approve:focus-visible{outline-color:var(--ok)}
#how .hw-grid[data-approved] .hw-approve__ic{display:block}
#how .hw-grid[data-approved] .hw-row__st--wait{display:none}
#how .hw-grid[data-approved] .hw-row__st--ok{display:inline}
#how .hw-row--c .hw-tick__pause{transition:opacity .25s var(--ease)}
#how .hw-grid[data-approved] .hw-row--c .hw-tick__ring{fill:var(--ok);stroke:var(--ok)}
#how .hw-grid[data-approved] .hw-row--c .hw-tick__pause{opacity:0}
#how .hw-grid[data-approved] .hw-row--c .hw-tick__mark{stroke-dashoffset:0}

/* ---------- engine: field + steps + pill ---------- */
#how .hw-engine{position:relative;width:100%;margin:0 auto}
#how .hw-field{position:absolute;z-index:-1;left:50%;top:50%;width:150%;aspect-ratio:1;transform:translate(-50%,-50%);pointer-events:none}
#how .hw-field__canvas{display:block;width:100%;height:100%}
/* phones: the field is exactly as wide as the 2x2 grid and centred on it · nothing past the viewport */
@media (max-width:640px){
  #how .hw-field{width:100%;max-width:100%}
}

#how .hw-steps{position:relative;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:14px;row-gap:68px}
#how .hw-step{position:relative;z-index:2;display:flex;flex-direction:column;min-height:168px;padding:16px 14px 18px;border:1px solid var(--hw-line);border-radius:var(--r);overflow:hidden;
  background:var(--hw-glass);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
  transition:border-color .45s var(--ease),background-color .45s var(--ease),box-shadow .45s var(--ease)}
#how .hw-step__num{display:block;font-family:var(--font-mono);font-weight:500;font-size:12px;line-height:1;color:var(--hw-dim);transition:color .45s var(--ease)}
#how .hw-step__name{margin-top:14px;font-size:17px;line-height:1.15;font-weight:600;letter-spacing:-.005em;color:var(--fg)}
#how .hw-step__text{margin-top:8px;font-size:13px;line-height:1.45;color:var(--hw-body)}
#how .hw-step__hit{position:absolute;inset:0;z-index:1;border-radius:inherit;cursor:pointer}
#how .hw-step__hit:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
#how .hw-step__bar{position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;opacity:0}
#how .hw-step:hover{border-color:var(--hw-line-2)}
#how .hw-grid:is([data-step="1"]) [data-hw-step="1"],
#how .hw-grid:is([data-step="2"]) [data-hw-step="2"],
#how .hw-grid:is([data-step="3"]) [data-hw-step="3"],
#how .hw-grid:is([data-step="4"]) [data-hw-step="4"]{
  border-color:rgba(255,143,90,.85);
  background:linear-gradient(180deg,rgba(255,143,90,.10),rgba(255,143,90,0) 70%),var(--hw-glass);
  box-shadow:0 0 0 4px rgba(255,143,90,.07),0 18px 40px -18px rgba(255,143,90,.35)}
#how .hw-grid[data-step="1"] [data-hw-step="1"] .hw-step__num,
#how .hw-grid[data-step="2"] [data-hw-step="2"] .hw-step__num,
#how .hw-grid[data-step="3"] [data-hw-step="3"] .hw-step__num,
#how .hw-grid[data-step="4"] [data-hw-step="4"] .hw-step__num{color:var(--accent)}

#how .hw-pill{position:absolute;z-index:3;left:50%;top:50%;transform:translate(-50%,-50%);display:inline-flex;align-items:center;gap:8px;height:30px;padding:0 15px 0 13px;
  white-space:nowrap;border-radius:999px;background:var(--accent);color:var(--accent-ink);box-shadow:0 0 0 6px rgba(24,24,24,.9),0 0 32px rgba(255,143,90,.45);
  font-family:var(--font-mono);font-weight:500;font-size:12px;line-height:1;letter-spacing:.06em;text-transform:uppercase;pointer-events:none}
#how .hw-pill__dot{--status-c:var(--accent-ink)} /* status symbol (live) in ink: it sits on the accent pill */
#how .hw-grid.is-playing .hw-pill__dot{animation:hw-blink 2.4s var(--ease) infinite}

/* ---------- caption + play/pause ---------- */
#how .hw-caption{display:none;font-size:12px;line-height:1;letter-spacing:.06em;color:var(--taupe)}
#how .hw-play{display:inline-flex;align-items:center;gap:8px;height:32px;padding:0 12px;border:1px solid var(--hw-line);border-radius:999px;font-size:12px;line-height:1;letter-spacing:.05em;color:var(--taupe);
  transition:border-color .25s var(--ease),color .25s var(--ease)}
#how .hw-play[hidden]{display:none}
#how .hw-play:hover{border-color:var(--hw-line-2);color:var(--fg)}
#how .hw-play__ic{width:10px;height:10px}
#how .hw-play__ic--play{display:none}
#how .hw-play.is-paused .hw-play__ic--play{display:block}
#how .hw-play.is-paused .hw-play__ic--pause{display:none}

/* ---------- footer CTA ---------- */
#how .hw-foot{margin-top:40px}
#how .hw-foot__inner{display:flex;justify-content:flex-start}

/* ---------- entrance (armed by JS only when motion is allowed) ---------- */
#how.hw-armed [data-hw-reveal]{opacity:0;transform:translate3d(0,28px,0)}
#how.hw-armed [data-hw-reveal].is-in{opacity:1;transform:none;transition:opacity .9s var(--ease-out) var(--d,0ms),transform 1.1s var(--ease-out) var(--d,0ms)}

@keyframes hw-spin{to{transform:rotate(360deg)}}
@keyframes hw-glow{0%,100%{box-shadow:0 0 0 0 rgba(255,143,90,.45)}60%{box-shadow:0 0 0 6px rgba(255,143,90,0)}}
@keyframes hw-blink{0%,100%{opacity:1}50%{opacity:.35}}

/* ---------- tablet: wider stack ---------- */
@media (min-width:641px){
  #how .hw-grid{max-width:600px}
  #how .hw-steps{column-gap:20px;row-gap:76px}
  #how .hw-step{min-height:148px;padding:18px 18px 20px}
  #how .hw-step__text{font-size:14px}
}

/* ==========================================================================
   Desktop: three columns · request | teammate | result
   ========================================================================== */
@media (min-width:1181px){
  #how .hw-grid{display:grid;max-width:none;align-items:center;
    grid-template-columns:clamp(272px,21vw,304px) minmax(0,1fr) clamp(272px,21vw,304px);
    grid-template-rows:40px 1px auto auto}
  #how .hw-label{order:0;justify-content:flex-start;text-align:left;align-self:start;margin:0}
  #how .hw-label--in{grid-column:1;grid-row:1}
  #how .hw-label--mid{display:flex;grid-column:2;grid-row:1;justify-content:center}
  #how .hw-label--out{grid-column:3;grid-row:1}
  #how .hw-rule{display:block;grid-column:1 / -1;grid-row:2;height:1px;background:var(--hw-line)}
  #how .hw-col{order:0;grid-row:3;margin-top:48px}
  #how .hw-col--in{grid-column:1}
  #how .hw-col--mid{grid-column:2}
  #how .hw-col--out{grid-column:3}
  #how .hw-engine{width:min(604px,calc(100% - clamp(48px,6vw,120px)))}
  #how .hw-steps{column-gap:clamp(32px,3.4vw,48px);row-gap:116px}
  #how .hw-step{min-height:196px;padding:22px 22px 24px}
  #how .hw-step__name{font-size:20px}
  #how .hw-step__text{margin-top:10px;font-size:15px;line-height:1.5}
  #how .hw-field{width:150%}
  #how .hw-foot-fig{order:0;grid-column:2;grid-row:4;margin-top:36px}

  #how .hw-foot{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));column-gap:24px;margin-top:56px}
  #how .hw-foot__inner{grid-column:1 / -1;justify-content:center}
}
/* desktop: the per-card labels are gone */
@media (min-width:1181px){
  #how .hw-illus{display:none}
  #how .hw-caption{display:block}
}
/* narrow desktop: keep the step cards readable in a tighter centre column */
@media (min-width:1181px) and (max-width:1320px){
  #how .hw-step{padding:20px 18px 22px}
  #how .hw-step__text{font-size:14px}
  /* side cards sit at their 272px minimum here: trim inner spacing so the context chip labels are never ellipsized */
  #how .hw-card{padding-left:16px;padding-right:16px}
  #how .hw-chip{gap:8px;padding:0 8px 0 10px}
}
/* desktop: both side cards share one height (and so one top edge), content spread evenly */
@media (min-width:1181px){
  #how .hw-card{min-height:392px}
  #how .hw-ctx,#how .hw-out{flex:1}
  #how .hw-ctx{justify-content:space-between}
  #how .hw-out{justify-content:space-between}
  #how .hw-row:last-child{padding-bottom:2px}
}