/* ==========================================================================
   UpSynQ — Platform page
   Requires foundation.css + home.css (illustrative, proof__value, ai-line).
   ========================================================================== */

/* 1 · Hero + decision path */
.pf-hero { padding: clamp(28px, 4.5vw, 64px) 0 clamp(56px, 7vw, 96px); }
.pf-hero__grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(28px, 4vw, 64px); align-items: center; }
.pf-hero__title { font-size: clamp(2.2rem, 1.2rem + 2.5vw, 3.3rem); font-weight: 800; letter-spacing: -0.035em; line-height: 1.06; max-width: 19ch; }
.pf-hero .hero__lede { margin-top: 24px; }

.pf-path { margin: 0; }
.pf-path__svg { width: 100%; height: auto; font-family: var(--font-body); overflow: visible; }
.pf-path__spine { fill: none; stroke: var(--ink); stroke-width: 1.5; }
.pf-path__head { fill: var(--ink); }
.pf-path__data rect { fill: var(--ink-soft); }
.pf-path__data path { fill: none; stroke: var(--ink-faint); stroke-width: 1; }
.pf-path__fc .band { fill: var(--cream-deep); }
.pf-path__fc .line { fill: none; stroke: var(--ink); stroke-width: 2.2; }
.pf-path__cons path { stroke: var(--terracotta); stroke-width: 1.4; stroke-dasharray: 5 4; fill: none; }
.pf-path__cons text { font-family: var(--font-mono); font-size: 14px; fill: var(--terracotta); }
.pf-path__region { fill: var(--ink); }
.pf-path__dot { fill: var(--terracotta); stroke: var(--cream); stroke-width: 3; }
.pf-path__review rect { fill: #fff; stroke: var(--ink); stroke-width: 1.4; }
.pf-path__review .t { font-family: var(--font-display); font-weight: 700; font-size: 17px; fill: var(--ink); }
.pf-path__review .s { font-family: var(--font-mono); font-size: 12px; fill: var(--ink-soft); }
.pf-path__loop { fill: none; stroke: var(--ink-soft); stroke-width: 1.2; stroke-dasharray: 3 4; }
.pf-path__loopt { font-family: var(--font-mono); font-size: 13px; fill: var(--ink-soft); }
.pf-path__labels text { font-family: var(--font-mono); font-size: 14px; letter-spacing: .14em; fill: var(--ink-soft); font-weight: 700; }
.pf-path__labels .em { fill: var(--terracotta); }
.pf-path__list { display: none; }
.js .pf-path__cons path { stroke-dashoffset: 300; animation: draw 1.2s var(--ease) .2s forwards; }
.js .pf-path__dot { opacity: 0; animation: fade .5s var(--ease) 1.3s forwards; }
@media (prefers-reduced-motion: reduce) { .js .pf-path__cons path { animation: none; stroke-dashoffset: 0; } .js .pf-path__dot { animation: none; opacity: 1; } }

@media (max-width: 960px) { .pf-hero__grid { grid-template-columns: 1fr; } }
@media (max-width: 640px) {
  .pf-path__svg { display: none; }
  .pf-path__list { display: grid; list-style: none; margin: 0; padding: 0; counter-reset: p; border-top: 1px solid var(--ink); }
  .pf-path__list li { counter-increment: p; position: relative; padding: 12px 0 12px 34px; border-bottom: 1px solid var(--rule); font-size: .93rem; line-height: 1.5; color: var(--ink-mid); }
  .pf-path__list li::before { content: counter(p, decimal-leading-zero); position: absolute; left: 0; top: 14px; font-family: var(--font-mono); font-size: .7rem; color: var(--ink-soft); }
  .pf-path__list b { display: block; font-family: var(--font-display); color: var(--ink); }
  .pf-path__list .is-choice b { color: var(--terracotta); }
  .pf-hero .hero__ctas .btn { flex: 1 1 100%; }
}

/* 2 · Same foundation, different decision (UI-PLATFORM-01) */
.pf { background: var(--cream); border: 1px solid var(--ink); }
.pf__bar { display: flex; justify-content: space-between; align-items: center; gap: 12px 20px; flex-wrap: wrap; padding: 14px 18px; background: var(--ink); }
.pf__bar .illustrative { color: var(--on-ink-soft); }
.pf__switch { display: inline-flex; border: 1px solid var(--on-ink-soft); }
.pf__switch button { min-height: 44px; padding: 8px 18px; background: transparent; border: 0; color: var(--cream); font-weight: 600; font-size: .95rem; cursor: pointer; text-align: left; }
.pf__switch button + button { border-left: 1px solid var(--on-ink-soft); }
.pf__switch button[aria-checked="true"] { background: var(--cream); color: var(--ink); }
.pf__context { padding: 16px 18px 0; font-size: .95rem; color: var(--ink-mid); }

.pf-case { transition: opacity .25s var(--ease); }
.pf-case[hidden] { display: none !important; }
.js .pf-case.is-entering { opacity: 0; }
@media (prefers-reduced-motion: reduce) { .pf-case { transition: none; } }

.pf-stages { list-style: none; margin: 14px 18px 0; padding: 0; border-top: 1px solid var(--ink); }
.pf-row { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.4fr); border-bottom: 1px solid var(--rule); }
.pf-row__shared { padding: 16px 20px 16px 0; display: grid; grid-template-columns: 34px 1fr; column-gap: 8px; align-content: start; border-right: 1px solid var(--rule); }
.pf-row__n { grid-row: 1 / span 2; font-family: var(--font-mono); font-size: .72rem; color: var(--ink-soft); padding-top: 4px; }
.pf-row__shared h3 { font-size: 1.05rem; letter-spacing: -0.01em; }
.pf-row__shared p { margin-top: 4px; font-size: .86rem; color: var(--ink-soft); line-height: 1.45; }
.pf-row__case { padding: 16px 0 16px 22px; font-size: .95rem; line-height: 1.55; color: var(--ink); display: flex; align-items: center; }
.pf-hl { color: var(--terracotta); font-weight: 600; }

.pf-out { margin: 18px; padding: 20px 22px; background: var(--ink); color: var(--cream); }
.pf-out > div { display: grid; gap: 12px; justify-items: start; }
.pf-out__label { font-family: var(--font-mono); font-size: .66rem; letter-spacing: .12em; text-transform: uppercase; color: var(--terracotta-light); }
.pf-out__verbs { margin: 0; width: 100%; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border-top: 1px solid var(--ink-line); }
.pf-out__verbs div { padding: 12px 16px 12px 0; }
.pf-out__verbs div + div { padding-left: 16px; border-left: 1px solid var(--ink-line); }
.pf-out__verbs dt { font-family: var(--font-display); font-weight: 800; font-size: 1.35rem; color: var(--terracotta-light); letter-spacing: -0.02em; }
.pf-out__verbs dd { margin: 4px 0 0; font-size: .9rem; line-height: 1.45; color: var(--cream); }
.pf-out__trade { font-size: .9rem; color: var(--on-ink-soft); line-height: 1.5; }
.pf-out__trade b { color: var(--cream); }
.pf-out .text-link { color: var(--cream); }
.pf-out .text-link:hover { color: var(--terracotta-light); }
.pf-key { display: flex; gap: 6px 18px; flex-wrap: wrap; padding: 0 18px 16px; font-size: .8rem; color: var(--ink-soft); }
.pf-key span { display: inline-flex; align-items: center; gap: 6px; }
.pf-key i { width: 12px; height: 12px; display: inline-block; }
.k-shared { background: var(--ink); } .k-own { background: var(--terracotta); }

@media (max-width: 860px) {
  .pf-row { grid-template-columns: 1fr; }
  .pf-row__shared { border-right: 0; padding: 14px 0 6px; }
  .pf-row__case { padding: 0 0 14px 42px; }
  .pf-out__verbs { grid-template-columns: 1fr; }
  .pf-out__verbs div + div { padding-left: 0; border-left: 0; border-top: 1px solid var(--ink-line); }
}
@media (max-width: 480px) {
  .pf__bar { padding: 12px; }
  .pf__switch { width: 100%; display: grid; grid-template-columns: 1fr 1fr; }
  .pf__switch button { padding: 8px 10px; font-size: .86rem; }
  .pf__context, .pf-key { padding-left: 12px; padding-right: 12px; }
  .pf-stages { margin: 12px 12px 0; }
  .pf-row__case { padding-left: 0; }
  .pf-out { margin: 14px 12px; padding: 16px; }
}

/* 3 · Data Foundry */
.df-steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); counter-reset: df; border-top: 1px solid var(--ink); }
.df-steps li { counter-increment: df; padding: 18px 20px 18px 0; display: grid; gap: 8px; align-content: start; }
.df-steps li + li { padding-left: 20px; border-left: 1px solid var(--rule); }
.df-steps b { font-family: var(--font-display); font-size: 1.15rem; }
.df-steps b::before { content: counter(df, decimal-leading-zero) '  '; font-family: var(--font-mono); font-size: .7rem; font-weight: 400; color: var(--ink-soft); }
.df-steps span { font-size: .9rem; color: var(--ink-mid); line-height: 1.5; }

.df-example { margin-top: clamp(28px, 4vw, 44px); display: grid; grid-template-columns: minmax(0, 1fr) 56px minmax(0, 1.2fr); align-items: stretch; }
.df-example__col { background: #fff; border: 1px solid var(--rule); padding: 18px 20px; }
.df-example__col:last-child { border-color: var(--ink); }
.df-example__h { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-soft); display: flex; justify-content: space-between; gap: 10px; margin-bottom: 12px; }
.df-cols, .df-notes { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.df-cols li { font-size: .86rem; color: var(--ink-mid); }
.df-cols code, .df-notes code { font-family: var(--font-mono); font-size: .8rem; background: var(--cream-warm); padding: 2px 6px; border: 1px solid var(--rule-soft); }
.df-cols .is-flag code { border-color: var(--terracotta); }
.df-cols .is-ask code { border: 1px dashed var(--terracotta); color: var(--terracotta); }
.df-notes li { font-size: .9rem; line-height: 1.5; padding-left: 14px; border-left: 2px solid var(--ink); }
.df-notes .is-ask { border-left-color: var(--terracotta); }
.df-notes .is-ask b { color: var(--terracotta); }
.df-example__arrow { position: relative; }
.df-example__arrow::before { content: ''; position: absolute; left: 12px; right: 14px; top: 50%; height: 1.5px; background: var(--ink); }
.df-example__arrow::after { content: ''; position: absolute; right: 10px; top: calc(50% - 5px); border: 5.5px solid transparent; border-left: 8px solid var(--ink); border-right: 0; }
@media (max-width: 960px) {
  .df-steps { grid-template-columns: 1fr 1fr; }
  .df-steps li:nth-child(3) { padding-left: 0; border-left: 0; }
  .df-steps li:nth-child(n+3) { border-top: 1px solid var(--rule); }
}
@media (max-width: 720px) {
  .df-steps { grid-template-columns: 1fr; }
  .df-steps li, .df-steps li + li { padding: 14px 0; border-left: 0; border-top: 1px solid var(--rule); }
  .df-steps li:first-child { border-top: 0; }
  .df-example { grid-template-columns: 1fr; }
  .df-example__arrow { height: 36px; }
  .df-example__arrow::before { left: 50%; right: auto; top: 6px; bottom: 6px; width: 1.5px; height: auto; }
  .df-example__arrow::after { right: auto; left: calc(50% - 5px); top: auto; bottom: 4px; border: 5.5px solid transparent; border-top: 8px solid var(--ink); border-bottom: 0; }
  .df-cols code, .df-notes code { word-break: break-word; }
}

/* 4 · Methods (on ink) */
.methods { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border-top: 1px solid var(--ink-line); }
.methods__col { padding: 24px 28px 24px 0; display: grid; gap: 10px; align-content: start; }
.methods__col--num { padding: 24px 0 24px 28px; border-left: 1px solid var(--ink-line); }
.methods__k { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--on-ink-soft); }
.methods__col--num .methods__k { color: var(--terracotta-light); }
.methods h3 { font-size: 1.4rem; letter-spacing: -0.02em; }
.methods ul { list-style: none; margin: 4px 0 0; padding: 0; display: grid; gap: 10px; }
.methods li { font-size: .95rem; line-height: 1.55; color: var(--on-ink-soft); padding-left: 14px; border-left: 1px solid var(--ink-line); }
.methods__col--num li { border-left-color: var(--terracotta-light); color: var(--cream); }

.select { margin-top: clamp(32px, 4vw, 48px); padding: 22px; background: var(--ink-raised); border: 1px solid var(--ink-line); }
.select__h { font-family: var(--font-display); font-weight: 700; font-size: 1.1rem; margin-bottom: 16px; }
.select__steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; }
.select__steps li { position: relative; padding: 0 18px 0 0; display: grid; gap: 6px; align-content: start; }
.select__steps li + li { padding-left: 18px; border-left: 1px solid var(--ink-line); }
.select__steps b { font-size: .98rem; }
.select__steps span { font-size: .86rem; line-height: 1.5; color: var(--on-ink-soft); }
.select__steps .is-guard b { color: var(--terracotta-light); }
.select__note { margin-top: 16px; font-size: .86rem; color: var(--on-ink-soft); }
@media (max-width: 860px) {
  .methods { grid-template-columns: 1fr; }
  .methods__col, .methods__col--num { padding: 20px 0; border-left: 0; }
  .methods__col--num { border-top: 1px solid var(--ink-line); }
  .select__steps { grid-template-columns: 1fr 1fr; gap: 16px 0; }
  .select__steps li:nth-child(3) { padding-left: 0; border-left: 0; }
}
@media (max-width: 480px) {
  .select { padding: 18px 16px; }
  .select__steps { grid-template-columns: 1fr; }
  .select__steps li, .select__steps li + li { padding: 0 0 12px; border-left: 0; border-bottom: 1px solid var(--ink-line); }
}

/* 5 · Tiers */
.tiers { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; align-items: stretch; }
.tier { padding: 22px; border: 1px solid var(--ink); display: grid; gap: 14px; align-content: start; }
.tier + .tier { border-left: 0; }
.tier--shared { background: var(--ink); color: var(--cream); }
.tier--config { background: #fff; border-style: solid; }
.tier--domain { background: var(--cream-warm); }
.tier__k { font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; display: grid; gap: 4px; }
.tier__k small { font-family: var(--font-mono); font-weight: 500; font-size: .64rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-soft); }
.tier--shared .tier__k small { color: var(--on-ink-soft); }
.tier ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.tier li { padding: 9px 0; border-top: 1px solid var(--rule-soft); font-size: .93rem; }
.tier--shared li { border-top-color: var(--ink-line); }
.tier--config li { border-top-style: dashed; }
.tier__pair { display: grid; gap: 12px; }
.tier__pair div { padding: 14px; border: 1px solid var(--terracotta); background: #fff; display: grid; gap: 4px; }
.tier__pair b { font-family: var(--font-display); color: var(--terracotta); }
.tier__pair span { font-size: .9rem; line-height: 1.5; color: var(--ink-mid); }

.compound { margin-top: clamp(32px, 4vw, 48px); border-top: 1px solid var(--ink); padding-top: 22px; }
.compound__h { font-family: var(--font-mono); font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-soft); }
.compound__list { list-style: none; margin: 16px 0 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; }
.compound__list li { padding: 0 18px 0 0; display: grid; gap: 6px; }
.compound__list li + li { padding-left: 18px; border-left: 1px solid var(--rule); }
.compound__list b { font-size: .98rem; }
.compound__list span { font-size: .88rem; color: var(--ink-mid); line-height: 1.5; }
.compound__note { margin-top: 20px; font-size: 1rem; color: var(--ink); max-width: 720px; padding-left: 14px; border-left: 3px solid var(--terracotta); }
@media (max-width: 960px) {
  .tiers { grid-template-columns: 1fr; }
  .tier + .tier { border-left: 1px solid var(--ink); border-top: 0; }
  .compound__list { grid-template-columns: 1fr 1fr; gap: 16px 0; }
  .compound__list li:nth-child(3) { padding-left: 0; border-left: 0; }
}
@media (max-width: 480px) {
  .compound__list { grid-template-columns: 1fr; }
  .compound__list li, .compound__list li + li { padding: 0 0 12px; border-left: 0; border-bottom: 1px solid var(--rule); }
}

/* 6 · Decision record */
.owners { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(28px, 5vw, 72px); align-items: center; }
.owners__copy h2 { font-size: var(--fs-h2); }
.owners__copy .lede { margin-top: 18px; }
.owners__p { margin-top: 18px; color: var(--ink-mid); line-height: 1.6; max-width: 560px; }
.record { background: #fff; border: 1px solid var(--ink); }
.record__head { display: flex; justify-content: space-between; align-items: center; padding: 10px 16px; background: var(--ink); color: var(--cream); font-family: var(--font-mono); font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; }
.record__head .illustrative { color: var(--on-ink-soft); }
.record__title { padding: 16px 16px 6px; font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; line-height: 1.3; }
.record__dl { margin: 0; padding: 0 16px 10px; }
.record__dl div { display: grid; grid-template-columns: 140px 1fr; gap: 12px; padding: 10px 0; border-top: 1px solid var(--rule-soft); }
.record__dl dt { font-family: var(--font-mono); font-size: .66rem; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-soft); padding-top: 3px; }
.record__dl dd { margin: 0; font-size: .9rem; line-height: 1.5; }
.record__status { display: inline-block; padding: 2px 8px; border: 1px solid var(--terracotta); color: var(--terracotta); font-family: var(--font-mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; }
@media (max-width: 860px) { .owners { grid-template-columns: 1fr; } }
@media (max-width: 480px) { .record__dl div { grid-template-columns: 1fr; gap: 2px; } }

/* 7 · Proof + close */
.pf-proof { list-style: none; margin: 0; padding: 22px 0 0; border-top: 1px solid var(--ink); display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.pf-proof li { padding: 0 clamp(18px, 3vw, 32px); border-left: 1px solid var(--rule); display: flex; flex-direction: column; gap: 10px; align-items: flex-start; }
.pf-proof li:first-child { padding-left: 0; border-left: 0; }
.pf-proof li > p:not(.proof__value) { font-size: .93rem; line-height: 1.5; color: var(--ink-mid); }
.pf-proof .text-link { margin-top: auto; font-size: .9rem; }
.pf-close { margin-top: clamp(56px, 7vw, 96px); display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: clamp(24px, 4vw, 64px); align-items: end; }
.pf-close__line { font-family: var(--font-display); font-weight: 800; font-size: clamp(1.8rem, 1.2rem + 2vw, 2.9rem); line-height: 1.1; letter-spacing: -0.03em; }
.pf-close__actions { display: grid; gap: 18px; justify-items: start; }
.pf-close__links { display: flex; gap: 20px; flex-wrap: wrap; }
@media (max-width: 860px) {
  .pf-proof { grid-template-columns: 1fr; }
  .pf-proof li, .pf-proof li:first-child { padding: 18px 0; border-left: 0; border-top: 1px solid var(--rule); }
  .pf-proof li:first-child { border-top: 0; padding-top: 0; }
  .pf-close { grid-template-columns: 1fr; align-items: start; }
}
@media (max-width: 480px) { .pf-close__actions .btn { width: 100%; } }