/* PROTOTYPE — /prototype/pipoo only (pp-* classes). Shell, tokens, chips, stepper and footer come from
   landing/a-base.css + pages/page-a.css. */

.pp-word { font-size: clamp(72px, 11vw, 168px) !important; letter-spacing: -.06em !important; }
.pp-sub { font-size: clamp(18px, 1.7vw, 22px) !important; color: var(--pa-ink) !important; font-weight: 500; }
.pp-acr { display: flex; gap: 4px; margin: 22px 0 4px; flex-wrap: wrap; }
.pp-acr span { display: flex; align-items: baseline; gap: 6px; padding: 6px 11px; border-radius: var(--pa-r-s); background: var(--pa-tint-1); border: var(--pa-bw) solid var(--pa-line); font-size: var(--pa-fs-sm); color: var(--pa-ink-2); }
.pp-acr b { font: 700 var(--pa-fs-md) var(--pa-font-mono); color: var(--pa-link); }

.pp { display: grid; gap: 112px; padding-top: 72px; }
.pp > * { min-width: 0; } /* grid items default to min-content: the 5-step scroller would widen the page on phones */
.pp > section > h2, .pp-two h2 { max-width: 24ch; }
.pp h2 em { font-style: normal; color: var(--pa-ink-3); }
.pp-two { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.pp-two > * { min-width: 0; }

/* proof strip */
.pp-cred-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)) 2fr; gap: 10px; margin-top: 14px; }
.pp-cred-grid > div { padding: 16px; border-radius: var(--pa-r-m); display: grid; gap: 4px; align-content: start; }
.pp-cred-grid b { font-size: 30px; font-weight: 700; letter-spacing: -.03em; color: var(--pa-ink); }
.pp-cred-grid > div:nth-child(3) b { font-size: 20px; padding-top: 6px; white-space: nowrap; }
.pp-cred-grid span { font-size: var(--pa-fs-sm); color: var(--pa-ink-3); line-height: 1.4; }
.pp-cred-grid blockquote { margin: 0; padding: 16px 18px; border-radius: var(--pa-r-m); border-left: 3px solid var(--pa-link) !important; font-size: var(--pa-fs-md); line-height: 1.55; color: var(--pa-ink-2); }

/* the mess */
.pp-mess { list-style: none; margin: 0; padding: 6px; border-radius: var(--pa-r-l); display: grid; gap: 2px; }
.pp-mess li { position: relative; padding: 12px 14px 12px 40px; border-radius: var(--pa-r-s); font-size: var(--pa-fs-md); line-height: 1.5; color: var(--pa-ink-2); }
.pp-mess li::before { content: "×"; position: absolute; left: 14px; top: 9px; font: 600 18px var(--pa-font-mono); color: var(--pa-st-error); }
.pp-mess li:hover { background: var(--pa-tint-2); }

/* what: the big question + the 5-link chain */
.pp-q { margin: 26px 0 18px; padding-left: 16px; border-left: 3px solid var(--pa-link); font-size: clamp(22px, 2.2vw, 30px); font-weight: 600; letter-spacing: -.02em; color: var(--pa-ink); max-width: 30ch; }
.pp-chain { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 8px; counter-reset: s; }
.pp-chain > div { padding: 14px; border-radius: var(--pa-r-m); display: grid; gap: 6px; align-content: start; position: relative; transition: border-color var(--pa-dur-2) var(--pa-ease), transform var(--pa-dur-2) var(--pa-ease); }
.pp-chain > div:hover { border-color: color-mix(in oklch, var(--pa-link) 50%, transparent); transform: translateY(-2px); }
.pp-chain > div:not(:last-child)::after { content: "→"; position: absolute; right: -9px; top: 18px; z-index: 1; font: 600 13px var(--pa-font-mono); color: var(--pa-ink-3); }
.pp-chain b { font: 800 30px var(--pa-font-ui); color: var(--pa-link); line-height: 1; }
.pp-chain > div:first-child b, .pp-chain > div:last-child b { color: var(--pa-st-attention); }
.pp-chain i { font-style: normal; font: var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-ink-3); text-transform: uppercase; letter-spacing: .05em; }
.pp-chain span { font-size: var(--pa-fs); line-height: 1.45; color: var(--pa-ink-2); }

/* sofa example: wrong / right */
.pp-ex { margin-top: 18px; padding: 18px; border-radius: var(--pa-r-l); }
.pp-ex-head { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; margin-bottom: 12px; }
.pp-ex-head h3 { font-size: 17px; }
.pp-ex-rows { display: grid; gap: 2px; }
.pp-ex-rows > div { display: grid; grid-template-columns: 30px 90px 1fr; gap: 12px; align-items: baseline; padding: 10px; border-radius: var(--pa-r-s); }
.pp-ex-rows > div:hover { background: var(--pa-tint-2); }
.pp-ex-rows em { font-style: normal; font: var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-ink-3); text-transform: uppercase; }
.pp-ex-rows .bad, .pp-ex-rows .good { grid-column: 3; grid-row: 1; font-size: var(--pa-fs-md); line-height: 1.5; transition: opacity var(--pa-dur-2) var(--pa-ease); }
.pp-ex-rows .bad { color: var(--pa-ink-3); }
.pp-ex-rows .good { color: var(--pa-ink); }
.pp-ex-rows[data-v="good"] .bad, .pp-ex-rows[data-v="bad"] .good { opacity: 0; pointer-events: none; }
.pp-ex-rows[data-v="bad"] .p-stage { background: color-mix(in oklch, var(--pa-st-error) 16%, transparent); color: var(--pa-st-error); }

/* stepper: 5 parts */
.pp-steps button span { font-weight: 600; }
.pp-steps button em { font: 800 22px var(--pa-font-ui) !important; color: var(--pa-link) !important; }

/* loop ring */
.pp-loop { align-items: center; }
.pp-ring { width: 100%; max-width: 420px; justify-self: center; color: var(--pa-st-attention); overflow: visible; }
.pp-ring-track { fill: none; stroke: var(--pa-line-strong); stroke-width: 2; }
.pp-ring-flow { fill: none; stroke: var(--pa-st-running); stroke-width: 2; stroke-dasharray: 6 10; animation: pp-dash 3s linear infinite; }
@keyframes pp-dash { to { stroke-dashoffset: -64; } }
.pp-ring g circle { fill: var(--pa-surface); stroke: var(--pa-line-strong); stroke-width: 1.5; }
.pp-ring g.edge circle { stroke: var(--pa-st-attention); stroke-width: 2; }
.pp-ring .k { font: 800 20px var(--pa-font-ui); fill: var(--pa-link); }
.pp-ring g.edge .k { fill: var(--pa-st-attention); }
.pp-ring .w { font: 11px var(--pa-font-mono); fill: var(--pa-ink-3); text-transform: uppercase; letter-spacing: .05em; }
.pp-ring-back { fill: none; stroke: currentColor; stroke-width: 2.5; stroke-dasharray: 5 6; animation: pp-dash 2s linear infinite reverse; }
@media (prefers-reduced-motion: reduce) { .pp-ring-flow, .pp-ring-back { animation: none; } }

/* why: timeline */
.pp-hist { list-style: none; margin: 18px 0 22px; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.pp-hist li { padding: 16px; border-radius: var(--pa-r-m); display: grid; gap: 6px; align-content: start; }
.pp-hist b { font: 700 22px var(--pa-font-mono); color: var(--pa-link); }
.pp-hist span { font-weight: 600; color: var(--pa-ink); font-size: var(--pa-fs-md); line-height: 1.35; }
.pp-hist small { font-size: var(--pa-fs); line-height: 1.5; color: var(--pa-ink-3); }
.pp-why { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.pp-why .p-lead { max-width: none; }

/* two loops */
.pp-loops { display: grid; grid-template-columns: 1fr auto 1fr; gap: 12px; align-items: stretch; margin-top: 18px; }
.pp-loop-card { padding: 20px; border-radius: var(--pa-r-l); display: grid; gap: 8px; align-content: start; }
.pp-loop-card h3 { font-size: 21px; }
.pp-loop-sub { margin: 0; font-size: var(--pa-fs); color: var(--pa-ink-3); line-height: 1.5; }
.pp-loop-card ol { list-style: none; margin: 6px 0 0; padding: 0; display: grid; gap: 4px; }
.pp-loop-card li { display: grid; grid-template-columns: 22px 1fr; gap: 8px; padding: 7px 8px; border-radius: var(--pa-r-s); font-size: var(--pa-fs-md); color: var(--pa-ink-2); line-height: 1.45; }
.pp-loop-card li:hover { background: var(--pa-tint-2); }
.pp-loop-card li b { font: 700 var(--pa-fs-md) var(--pa-font-mono); color: var(--pa-link); }
.pp-bridge { display: grid; place-items: center; }
.pp-bridge span { writing-mode: vertical-rl; transform: rotate(180deg); font: var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-st-attention); padding: 12px 6px; border-radius: var(--pa-r-pill); border: var(--pa-bw) dashed color-mix(in oklch, var(--pa-st-attention) 50%, transparent); }
.pp-note { margin-top: 14px !important; }
.pp-prompt { margin-top: 12px; border-radius: var(--pa-r-l); }
.pp-prompt summary, .pp-cmp summary { cursor: pointer; list-style: none; padding: 14px 18px; font-weight: 600; color: var(--pa-ink); display: flex; justify-content: space-between; gap: 12px; }
.pp-prompt summary::-webkit-details-marker, .pp-cmp summary::-webkit-details-marker { display: none; }
.pp-prompt summary::after, .pp-cmp summary::after { content: "+"; font-family: var(--pa-font-mono); color: var(--pa-ink-3); }
.pp-prompt[open] summary::after, .pp-cmp details[open] summary::after { content: "−"; }
.pp-prompt dl { margin: 0; padding: 0 18px 18px; display: grid; grid-template-columns: 120px 1fr; gap: 10px 14px; }
.pp-prompt dt { font: var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-link); padding-top: 3px; }
.pp-prompt dd { margin: 0; font: var(--pa-fs) / 1.55 var(--pa-font-mono); color: var(--pa-ink-2); }

/* self-check */
.pp-diag-top { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; margin: 18px 0 12px; }
.pp-rail { display: flex; gap: 6px; }
.pp-rail span { width: 36px; height: 36px; display: grid; place-items: center; border-radius: var(--pa-r-s); border: var(--pa-bw) solid var(--pa-line); font: 700 var(--pa-fs-md) var(--pa-font-mono); color: var(--pa-ink-3); transition: background var(--pa-dur-2) var(--pa-ease), color var(--pa-dur-2), border-color var(--pa-dur-2); }
.pp-rail span.ok { background: color-mix(in oklch, var(--pa-st-done) 16%, transparent); color: var(--pa-st-done); border-color: transparent; }
.pp-rail span.stop { background: color-mix(in oklch, var(--pa-st-attention) 18%, transparent); color: var(--pa-st-attention); border-color: transparent; }
.pp-quiz { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.pp-quiz li { padding: 18px; border-radius: var(--pa-r-l); display: grid; gap: 10px; align-content: start; }
.pp-quiz li:last-child:nth-child(odd) { grid-column: 1 / -1; }
.pp-quiz h3 { font-size: 17px; line-height: 1.4; }
.pp-ans { display: grid; gap: 6px; }
.pp-ans button { text-align: left; padding: 10px 12px; border-radius: var(--pa-r-m); border: var(--pa-bw) solid var(--pa-line); background: var(--pa-tint-1); color: var(--pa-ink-2); font: var(--pa-fs) / 1.45 var(--pa-font-ui); cursor: pointer; transition: border-color var(--pa-dur-1), background var(--pa-dur-1), color var(--pa-dur-1); }
.pp-ans button:hover { border-color: var(--pa-line-strong); color: var(--pa-ink); }
.pp-ans button[data-a="ok"].on { border-color: color-mix(in oklch, var(--pa-st-done) 55%, transparent); background: color-mix(in oklch, var(--pa-st-done) 12%, transparent); color: var(--pa-ink); }
.pp-ans button[data-a="stop"].on { border-color: color-mix(in oklch, var(--pa-st-attention) 55%, transparent); background: color-mix(in oklch, var(--pa-st-attention) 12%, transparent); color: var(--pa-ink); }
.pp-fix { margin: 0; padding: 12px 14px; border-radius: var(--pa-r-m); background: var(--pa-accent-tint); color: var(--pa-ink); font-size: var(--pa-fs); line-height: 1.5; display: grid; gap: 4px; animation: p-in var(--pa-dur-3) var(--pa-ease); }
.pp-fix b { font: var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-link); text-transform: uppercase; letter-spacing: .05em; }

/* compare + not-for */
.pp-cmp details { border-radius: var(--pa-r-m); margin-top: 8px; }
.pp-cmp details p { margin: 0; padding: 0 18px 16px; font-size: var(--pa-fs-md); line-height: 1.55; color: var(--pa-ink-2); }
.pp-not summary { color: var(--pa-st-attention) !important; }

/* agent */
.pp-agent { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 8px; margin-top: 18px; }
.pp-agent > div { padding: 16px; border-radius: var(--pa-r-m); display: grid; gap: 8px; align-content: start; justify-items: start; }
.pp-agent em { font: normal var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-ink-3); }
.pp-agent b { font-weight: 600; color: var(--pa-ink); line-height: 1.35; }
.pp-cmd { font: var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-link); background: var(--pa-tint-2); padding: 3px 7px; border-radius: var(--pa-r-xs); }
.pp-stmt { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 16px; padding: 18px 20px; border-radius: var(--pa-r-l); border: var(--pa-bw) dashed var(--pa-line-strong); }
.pp-stmt p { margin: 0; font-size: 19px; font-weight: 600; color: var(--pa-ink); }

/* outro steps */
.pp-start { list-style: none; margin: 8px 0 16px; padding: 0; display: grid; gap: 8px; }
.pp-start li { display: flex; gap: 10px; align-items: baseline; justify-content: flex-end; font-size: var(--pa-fs-md); color: var(--pa-ink-2); }
.pp-start b { font: 700 var(--pa-fs-sm) var(--pa-font-mono); color: var(--pa-link); }

@media (max-width: 860px) {
  .pp { gap: 72px; padding-top: 40px; }
  .pp-word { font-size: 72px !important; }
  .pp-two, .pp-why { grid-template-columns: 1fr; gap: 24px; }
  .pp-cred-grid { grid-template-columns: 1fr 1fr; }
  .pp-cred-grid > div:nth-child(3) { grid-column: 1 / -1; }
  .pp-ex-head { flex-direction: column; align-items: stretch; }
  .pp-toggle { flex-wrap: wrap !important; overflow: visible !important; }
  .pp-toggle button { white-space: normal !important; flex: 1 1 140px; justify-content: center; text-align: center; }
  .pp-cred-grid b { font-size: 22px; }
  .pp-cred-grid blockquote { grid-column: 1 / -1; }
  .pp-chain { grid-template-columns: 1fr; }
  .pp-chain > div { grid-template-columns: 36px 1fr; }
  .pp-chain b { grid-row: span 2; }
  .pp-chain > div:not(:last-child)::after { content: "↓"; right: auto; left: 22px; top: auto; bottom: -13px; }
  .pp-ex-rows > div { grid-template-columns: 30px 1fr; }
  .pp-ex-rows em { display: none; }
  .pp-ex-rows .bad, .pp-ex-rows .good { grid-column: 2; }
  .pp-hist { grid-template-columns: 1fr 1fr; }
  .pp-loops { grid-template-columns: 1fr; }
  .pp-bridge span { writing-mode: horizontal-tb; transform: none; padding: 6px 12px; }
  .pp-prompt dl { grid-template-columns: 1fr; gap: 4px; }
  .pp-prompt dd { margin-bottom: 8px; }
  .pp-quiz { grid-template-columns: 1fr; }
  .pp-rail span { width: 30px; height: 30px; }
  .pp-agent { grid-template-columns: 1fr 1fr; }
  .pp-agent > div:last-child { grid-column: 1 / -1; }
  .pp-start li { justify-content: flex-start; }
}

/* IPO inside SIPOC: who-ends (SIPOC, teal) and why-ends (PIPOO, amber) wrap one shared IPO core */
.pp-x { position: relative; display: grid; grid-template-columns: 1fr 1.5fr 1fr; gap: 14px; align-items: center; margin: 26px 0 8px; }
.pp-x-ends { display: grid; gap: 10px; }
.pp-x-ends--l { grid-column: 1; grid-row: 1; }
.pp-x-ends--r { grid-column: 3; grid-row: 1; }
.pp-x-ends > div { padding: 14px 16px; border-radius: var(--pa-r-m); display: grid; grid-template-columns: 34px 1fr; column-gap: 10px; align-items: baseline; position: relative; }
.pp-x-ends b { grid-row: span 2; font: 800 26px var(--pa-font-ui); line-height: 1; }
.pp-x-ends span { font-weight: 600; color: var(--pa-ink); }
.pp-x-ends small { font-size: var(--pa-fs); color: var(--pa-ink-3); line-height: 1.4; }
.pp-x-ends .sipoc { border-color: color-mix(in oklch, var(--pa-link) 45%, transparent); }
.pp-x-ends .sipoc b { color: var(--pa-link); }
.pp-x-ends .pipoo { border-color: color-mix(in oklch, var(--pa-st-attention) 45%, transparent); }
.pp-x-ends .pipoo b { color: var(--pa-st-attention); }
/* connector ticks from each end card toward the core */
.pp-x-ends--l > div::after, .pp-x-ends--r > div::before { content: ""; position: absolute; top: 50%; width: 14px; height: 1px; background: var(--pa-line-strong); }
.pp-x-ends--l > div::after { right: -15px; }
.pp-x-ends--r > div::before { left: -15px; }
.pp-x-core { grid-column: 2; grid-row: 1; padding: 22px; border-radius: var(--pa-r-l); text-align: center; background: var(--pa-accent-tint) !important; border-color: color-mix(in oklch, var(--pa-link) 40%, transparent) !important; }
.pp-x-core small { font: var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-ink-3); text-transform: uppercase; letter-spacing: .06em; }
.pp-x-core p { margin: 10px 0 0; font-size: 19px; font-weight: 600; color: var(--pa-ink); display: flex; justify-content: center; align-items: baseline; gap: 6px; flex-wrap: wrap; }
.pp-x-core b { font: 800 22px var(--pa-font-ui); color: var(--pa-link); margin-right: 2px; }
.pp-x-core i { font-style: normal; color: var(--pa-ink-3); }
.pp-x-legend { grid-column: 1 / -1; display: flex; gap: 16px; justify-content: center; margin: 4px 0 0; font: var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-ink-3); }
.pp-x-legend span::before { content: ""; display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; }
.pp-x-legend .sipoc::before { background: var(--pa-link); }
.pp-x-legend .pipoo::before { background: var(--pa-st-attention); }

/* SOP → AI */
.pp-sop { display: grid; grid-template-columns: 1fr 1.4fr; gap: 32px; margin-top: 56px; align-items: start; }
.pp-sop h3 { font-size: clamp(22px, 2.2vw, 30px); line-height: 1.2; margin-top: 8px; max-width: 20ch; }
.pp-sop .p-lead { max-width: none; }
.pp-sop-ex { margin-top: 20px; padding: 18px; border-radius: var(--pa-r-l); }
.pp-sop-title { margin: 0 0 12px; font-weight: 600; color: var(--pa-ink); }
.pp-sop-grid { display: grid; gap: 2px; }
.pp-sop-row { display: grid; grid-template-columns: 150px 1.3fr 1.2fr 0.9fr 190px; gap: 14px; align-items: baseline; padding: 11px 10px; border-radius: var(--pa-r-s); font-size: var(--pa-fs); line-height: 1.45; color: var(--pa-ink-2); }
.pp-sop-row:not(.pp-sop-head):hover { background: var(--pa-tint-2); }
.pp-sop-head { font: var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-ink-3); letter-spacing: .02em; /* no uppercase: "Ai phụ trách" would read as "AI" */ border-bottom: var(--pa-bw) solid var(--pa-line); border-radius: 0; padding-bottom: 8px; }
.pp-sop-row .st { font-weight: 600; color: var(--pa-ink); display: flex; gap: 8px; }
.pp-sop-row .st em { font: normal var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-ink-3); padding-top: 2px; }
.pp-who { font-style: normal; display: inline-block; white-space: nowrap; padding: 3px 8px; border-radius: var(--pa-r-pill); font: 600 var(--pa-fs-xs) var(--pa-font-mono); }
.pp-who--ai { color: var(--pa-st-done); background: color-mix(in oklch, var(--pa-st-done) 14%, transparent); }
.pp-who--draft { color: var(--pa-st-attention); background: color-mix(in oklch, var(--pa-st-attention) 14%, transparent); }
.pp-who--human { color: var(--pa-ink); background: var(--pa-tint-3); }
.pp-sop-out { display: flex; gap: 10px; align-items: baseline; margin: 12px 0 0; padding: 12px 12px; border-radius: var(--pa-r-m); background: color-mix(in oklch, var(--pa-st-attention) 10%, transparent); color: var(--pa-ink); font-size: var(--pa-fs-md); }
.pp-sop-out b { font: 800 18px var(--pa-font-ui); color: var(--pa-st-attention); }

@media (max-width: 860px) {
  .pp-x { grid-template-columns: 1fr 1fr; }
  .pp-x-core { grid-column: 1 / -1; grid-row: 1; }
  .pp-x-ends--l { grid-column: 1; grid-row: 2; }
  .pp-x-ends--r { grid-column: 2; grid-row: 2; }
  .pp-x-ends > div { grid-template-columns: 1fr; padding: 12px; }
  .pp-x-ends b { grid-row: auto; font-size: 22px; margin-bottom: 4px; }
  .pp-x-ends--l > div::after, .pp-x-ends--r > div::before { display: none; }
  .pp-sop { grid-template-columns: 1fr; gap: 12px; margin-top: 40px; }
  .pp-sop-head { display: none !important; }
  .pp-sop-row { grid-template-columns: 1fr auto; gap: 6px 10px; padding: 12px 8px; border-top: var(--pa-bw) solid var(--pa-line); border-radius: 0; }
  .pp-sop-row .st { grid-column: 1; }
  .pp-sop-row > span:last-child { grid-column: 2; grid-row: 1; }
  .pp-sop-row > span[data-l] { grid-column: 1 / -1; display: grid; grid-template-columns: 92px 1fr; gap: 8px; }
  .pp-sop-row > span[data-l]::before { content: attr(data-l); font: var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-ink-3); padding-top: 2px; }
}