/* sections/how.html (#how): three steps and the example conversation window. Uses core.css tokens.
   States (set by js/sections/how.js): .convo[data-state=idle|listen|think|speak|done], .convo.is-armed (messages wait for
   .shown), .msg.past, .how-steps.is-armed + .how-step.on. Without them everything shows, finished. */
.how-in{display:grid;gap:clamp(48px,7vw,104px);align-items:center;grid-template-columns:minmax(0,1fr)}
/* the copy column is wide enough for "Not another to-do list." on one line from 1280px (two-line headline) */
@media (min-width:960px){.how-in{gap:clamp(48px,5vw,64px);grid-template-columns:minmax(0,1.04fr) minmax(0,.96fr)}}
.how-sub{max-width:30em}

/* the three steps, on a track */
.how-steps{--n:40px;list-style:none;margin:var(--space-7) 0 0;padding:0;display:grid;gap:var(--space-2)}
.how-step{position:relative;display:flex;gap:var(--space-5);padding:var(--space-4) var(--space-4) var(--space-4) 0;border-radius:var(--r-l)}
.how-step:not(:last-child)::after{content:"";position:absolute;left:calc(var(--n) / 2 - .5px);top:calc(var(--space-4) + var(--n) + 6px);
  bottom:calc(-1 * var(--space-2) - var(--space-4) + 6px);border-left:1.5px dashed var(--line-2)}
.how-step h3{margin:7px 0 4px;font-size:var(--fs-h4);transition:color var(--d-3) ease}
.how-step p{color:var(--ink-2);max-width:36ch;transition:color var(--d-3) ease}
.how-n{flex:none;display:grid;place-items:center;width:var(--n);height:var(--n);border-radius:50%;background:var(--accent-soft);color:var(--accent-ink);
  font:800 1rem/1 var(--font-display);transition:background-color var(--d-3) ease,color var(--d-3) ease,box-shadow var(--d-3) ease,transform var(--d-3) var(--ease-spring)}
.how-steps.is-armed .how-step:not(.on) h3{color:var(--ink-3)}
.how-steps.is-armed .how-step:not(.on) p{color:var(--ink-3)}
.how-steps.is-armed .how-step:not(.on) .how-n{background:var(--surface-3);color:var(--ink-3)}
.how-step.on .how-n{background:var(--brand);color:var(--on-brand);box-shadow:0 0 0 6px var(--accent-soft);transform:scale(1.04)}
.how-win{display:flex;align-items:flex-start;gap:10px;margin-top:var(--space-6);max-width:42ch;color:var(--ink-3);font-size:var(--fs-xs);line-height:1.5}
.how-win svg{flex:none;width:14px;height:14px;margin-top:2px;color:var(--ink-3)}

/* the conversation window */
.how-stage{position:relative}
.how-stage::before{content:"";position:absolute;inset:6% 0 -4% 6%;z-index:-1;border-radius:50%;background:radial-gradient(closest-side,var(--glow),transparent);pointer-events:none}
.convo .window-bar{gap:10px}
.convo-title{display:inline-flex;align-items:center;gap:7px;margin:0;color:var(--ink-2)}
.convo-title img{width:16px;height:16px;border-radius:4px}
.convo-status{position:relative;display:grid;margin-left:auto;justify-items:end}
.cs{grid-area:1/1;display:inline-flex;align-items:center;gap:6px;padding:3px 10px;border-radius:var(--r-pill);background:var(--surface-3);color:var(--ink-2);
  font:650 var(--fs-micro)/1.4 var(--font-sans);letter-spacing:.02em;white-space:nowrap;opacity:0;transform:translateY(4px);transition:opacity var(--d-2) ease,transform var(--d-3) var(--ease-out)}
.cs svg{width:13px;height:13px}
.cs .spinner{width:11px;height:11px;border-width:1.6px}
.cs-idle{background:var(--ok-soft);color:var(--ok)}
.cs-listen,.cs-speak{background:var(--accent-soft);color:var(--accent-ink)}
.cs-done{background:var(--ok-soft);color:var(--ok)}
.cs-done svg{stroke-width:2.6}
.convo:not([data-state]) .cs-idle,.convo[data-state="idle"] .cs-idle,.convo[data-state="listen"] .cs-listen,.convo[data-state="think"] .cs-think,
.convo[data-state="speak"] .cs-speak,.convo[data-state="done"] .cs-done{opacity:1;transform:none}
.convo-replay{width:30px;height:30px;margin-right:-6px}
.convo-replay svg{width:16px;height:16px}

.convo-body{display:flex;flex-direction:column;gap:var(--space-3);padding:var(--space-6) var(--space-5) var(--space-5)}
.msg{max-width:84%;padding:11px 16px;border-radius:var(--r-bubble);font-size:var(--fs-s);line-height:1.5;transform-origin:0 100%}
.msg-user{align-self:flex-end;border-radius:var(--r-bubble-user);background:var(--brand);color:var(--on-brand);transform-origin:100% 100%;box-shadow:var(--shadow-1)}
.msg-noty{align-self:flex-start;border:1px solid var(--line);background:var(--surface-2)}
.msg-think{align-self:flex-start;padding:2px 2px;color:var(--ink-3);font-size:var(--fs-xs)}
.msg-think>span{display:inline-flex;align-items:center;gap:8px}
.msg-think svg{width:15px;height:15px;color:var(--ok)}
.msg-think .t-now{display:none}
.convo.is-armed .msg-think:not(.past) .t-now{display:inline-flex}
.convo.is-armed .msg-think:not(.past) .t-done{display:none}
.msg-action{align-self:flex-start;display:flex;align-items:center;gap:var(--space-3);padding:10px 16px 10px 10px;border:1px solid var(--line-2);border-radius:var(--r-m);background:var(--surface);
  box-shadow:var(--shadow-2)}
.msg-action strong{display:block;font-size:var(--fs-s)}
.msg-action div span{font-size:var(--fs-xs);color:var(--ink-3)}
.act-icon{flex:none;display:grid;place-items:center;width:36px;height:36px;border-radius:var(--r-s);background:var(--grad-brand);color:#FFFFFF}
.act-icon svg{width:18px;height:18px}
.spinner{flex:none;display:inline-block;width:14px;height:14px;border-radius:50%;border:2px solid var(--line-2);border-top-color:var(--accent);animation:how-spin .8s linear infinite}
@keyframes how-spin{to{transform:rotate(360deg)}}

/* playback: messages wait, then rise in */
.convo.is-armed .msg{opacity:0;transform:translateY(10px) scale(.97)}
.convo.is-armed .msg.shown{opacity:1;transform:none;transition:opacity var(--d-4) var(--ease-out),transform var(--d-4) var(--ease-spring)}
.convo.is-armed .msg-action.shown .act-icon{animation:how-pop var(--d-4) var(--ease-spring) .1s both}
@keyframes how-pop{from{transform:scale(.6)}}

/* the voice line: live while listening or speaking, resting otherwise */
.convo-wave{display:flex;align-items:center;justify-content:center;height:56px;border-top:1px solid var(--line);background:var(--surface-2)}
.convo-wave svg{width:220px;height:28px;fill:var(--accent);opacity:.8}
.convo-wave rect{transform-box:fill-box;transform-origin:center;transition:transform var(--d-4) var(--ease-out)}
.convo.is-armed:not([data-state="listen"]):not([data-state="speak"]) .convo-wave rect{transform:scaleY(.22)}
.convo[data-state="listen"] .convo-wave rect,.convo[data-state="speak"] .convo-wave rect{animation:how-eq 1.1s var(--ease-in-out) infinite}
.convo-wave rect:nth-child(3n){animation-delay:-.25s}
.convo-wave rect:nth-child(3n+1){animation-delay:-.55s}
.convo-wave rect:nth-child(4n){animation-duration:.85s}
.convo-wave rect:nth-child(5n){animation-duration:1.4s}
@keyframes how-eq{0%,100%{transform:scaleY(1)}50%{transform:scaleY(.4)}}

@media (max-width:639.98px){
  .convo-body{padding:var(--space-5) var(--space-4) var(--space-4)}
  .msg{max-width:92%}
  .how-step{gap:var(--space-4)}
}