/* php-performance.php (2026-09-27). The page's pictures are built in HTML, one shape per section:
   a request waterfall with three states, an annotated configuration file, a rotary dial with the
   pool arithmetic under it, two lanes from web server to PHP, and a row of instrument readings.
   Copper is the one accent (work PHP does, the dial's hand); patina marks what the cache answers.
   Motion is transform and opacity, 160-240ms ease-out; hover movement only on a real pointer;
   nothing endless; reduced motion keeps colour changes only. */

.pp-sr { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; opacity: 0; }
.pp-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.pp-actions-c { justify-content: center; }
.pp-link { display: inline-flex; align-items: center; gap: 6px; color: var(--copper-ink); font-weight: 600; text-decoration: none; }
.pp-link span { display: inline-block; transition: transform var(--dur-1) var(--ease-out); }
html[dir="rtl"] .pp-link span { transform: scaleX(-1); }

/* ---- 1. the waterfall ------------------------------------------------------------------ */
.pp-wf { border: 1px solid var(--line); border-radius: 18px; background: var(--surface); box-shadow: var(--shadow-2); overflow: hidden; }
.pp-wf-top { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 20px; padding: 14px 20px; border-bottom: 1px solid var(--line); }
.pp-seg { display: inline-flex; flex-wrap: wrap; gap: 2px; padding: 4px; border: 1px solid var(--line); border-radius: 22px; background: var(--bg-alt); }
.pp-seg label { display: inline-flex; align-items: center; min-height: 38px; padding: 6px 16px; border-radius: 999px; font-size: 14px; font-weight: 600; color: var(--text-2); cursor: pointer; user-select: none; transition: background-color var(--dur-1) var(--ease-out), color var(--dur-1) var(--ease-out); }
#pp-st-b:checked ~ .pp-wf-top label[for="pp-st-b"],
#pp-st-a:checked ~ .pp-wf-top label[for="pp-st-a"],
#pp-st-c:checked ~ .pp-wf-top label[for="pp-st-c"] { background: var(--text-strong); color: var(--bg); }
#pp-st-b:focus-visible ~ .pp-wf-top label[for="pp-st-b"],
#pp-st-a:focus-visible ~ .pp-wf-top label[for="pp-st-a"],
#pp-st-c:focus-visible ~ .pp-wf-top label[for="pp-st-c"] { outline: 2px solid var(--copper-ink); outline-offset: 2px; }
.pp-tag { font-family: var(--font-mono); font-size: 12px; color: var(--text-muted); padding: 5px 11px; border: 1px dashed var(--line-strong, var(--line)); border-radius: 999px; }

.pp-wf-rows { list-style: none; margin: 0; padding: 4px 20px 0; --m: var(--mb); }
#pp-st-a:checked ~ .pp-wf-rows { --m: var(--ma); }
#pp-st-c:checked ~ .pp-wf-rows { --m: var(--mc); }
.pp-wf-row { display: grid; grid-template-columns: minmax(0, 17rem) minmax(0, 1fr); gap: 0 24px; border-top: 1px solid var(--line); }
.pp-wf-row:first-child { border-top: 0; }
.pp-wf-label { padding: 12px 0; min-height: 64px; }
.pp-wf-label b { display: block; font-size: 15px; line-height: 1.35; color: var(--text-strong); }
.pp-wf-label small { display: none; margin-top: 3px; font-size: 13px; line-height: 1.5; color: var(--text-muted); }
.pp-wf-label .st-b { display: block; }
#pp-st-a:checked ~ .pp-wf-rows .st-b, #pp-st-c:checked ~ .pp-wf-rows .st-b { display: none; }
#pp-st-a:checked ~ .pp-wf-rows .st-a, #pp-st-c:checked ~ .pp-wf-rows .st-c { display: block; }

.pp-wf-track { position: relative; overflow: hidden; background-image: repeating-linear-gradient(to right, var(--line) 0 1px, transparent 1px 10%); }
html[dir="rtl"] .pp-wf-track { background-image: repeating-linear-gradient(to left, var(--line) 0 1px, transparent 1px 10%); }
.pp-bar { --s: var(--bs); --w: var(--bw); position: absolute; top: 50%; inset-inline-start: 0; width: 100%; height: 14px; margin-top: -7px; border-radius: 2px;
    background: color-mix(in srgb, var(--text-muted) 55%, var(--surface)); transform-origin: left center;
    transform: translateX(calc(var(--s) * 1%)) scaleX(calc(var(--w) / 100)); transition: transform 240ms var(--ease-out), background-color var(--dur-1) var(--ease-out); }
html[dir="rtl"] .pp-bar { transform-origin: right center; transform: translateX(calc(var(--s) * -1%)) scaleX(calc(var(--w) / 100)); }
.pp-wf-row.is-php .pp-bar { background: var(--fill-copper, #E85622); }
#pp-st-a:checked ~ .pp-wf-rows .pp-bar { --s: var(--as); --w: var(--aw); }
#pp-st-c:checked ~ .pp-wf-rows .pp-bar { --s: var(--cs); --w: var(--cw); }
#pp-st-c:checked ~ .pp-wf-rows .is-send .pp-bar { background: var(--patina-ink); }
/* the first byte: one dashed line through every track, moved by the state */
.pp-wf-track::after { content: ''; position: absolute; inset-block: 0; inset-inline-start: 0; width: 100%; border-inline-start: 2px dashed var(--text-strong); opacity: .55;
    transform: translateX(calc(var(--m) * 1%)); transition: transform 240ms var(--ease-out); }
html[dir="rtl"] .pp-wf-track::after { transform: translateX(calc(var(--m) * -1%)); }
.pp-wf-row:nth-child(2) .pp-bar { transition-delay: 25ms; }
.pp-wf-row:nth-child(3) .pp-bar { transition-delay: 50ms; }
.pp-wf-row:nth-child(4) .pp-bar { transition-delay: 75ms; }
.pp-wf-row:nth-child(5) .pp-bar { transition-delay: 100ms; }
.pp-wf-row:nth-child(6) .pp-bar { transition-delay: 125ms; }
.pp-wf-row:nth-child(7) .pp-bar { transition-delay: 150ms; }
.pp-wf-row:nth-child(8) .pp-bar { transition-delay: 175ms; }
/* on scroll-in the bars grow from their start; before the observer runs they are drawn in full */
html.anim-ready .pp-wf:not(.revealed) .pp-bar { --w: 0; }

.pp-wf-foot { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px; padding: 12px 20px 14px; border-top: 1px solid var(--line); font-size: 12.5px; color: var(--text-muted); }
.pp-key { display: inline-flex; align-items: center; gap: 8px; }
.pp-key i { width: 16px; height: 8px; border-radius: 2px; flex: none; }
.pp-key .k-net { background: color-mix(in srgb, var(--text-muted) 55%, var(--surface)); }
.pp-key .k-php { background: var(--fill-copper, #E85622); }
.pp-key .k-ttfb { width: 0; height: 14px; border-inline-start: 2px dashed var(--text-strong); opacity: .55; border-radius: 0; }
.pp-axis { margin-inline-start: auto; font-family: var(--font-mono); }
.pp-axis i { display: inline-block; font-style: normal; }
html[dir="rtl"] .pp-axis i { transform: scaleX(-1); }

.pp-measured { margin-top: clamp(40px, 5vw, 64px); padding-top: clamp(24px, 3vw, 36px); border-top: 1px solid var(--line); }
.pp-measured-lead { margin: 0 0 20px; font-size: 14px; color: var(--text-muted); }

/* ---- 2. the annotated configuration ---------------------------------------------------- */
.pp-conf { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: clamp(28px, 5vw, 64px); align-items: start; }
.pp-file { margin: 0; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); box-shadow: var(--shadow-2); overflow: hidden; position: sticky; top: 96px; }
.pp-file-top { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 4px 16px; padding: 10px 16px; border-bottom: 1px solid var(--line); font-family: var(--font-mono); font-size: 12.5px; color: var(--text-2); }
.pp-file-top small { font-family: var(--font-body); font-size: 12px; color: var(--text-muted); }
.pp-file-sh { border-top: 1px solid var(--line); }
.pp-file pre, .pp-mode pre, .pp-calc-cmd { margin: 0; padding: 14px 16px; overflow-x: auto; background: var(--well); font-family: var(--font-mono); font-size: 13px; line-height: 1.75; color: var(--text); text-align: left; }
.pp-file pre code, .pp-mode pre code, .pp-calc-cmd code { background: none; padding: 0; font: inherit; color: inherit; white-space: pre; word-break: normal; }
.pp-ln { display: block; position: relative; margin: 0 -16px; padding: 2px 16px 2px 40px; border-left: 2px solid transparent; transition: background-color var(--dur-1) var(--ease-out), border-color var(--dur-1) var(--ease-out); }
.pp-ln::before { content: attr(data-n); position: absolute; left: 14px; top: 2px; font-size: 11.5px; color: var(--copper-ink); }
.pp-notes { list-style: none; margin: 0; padding: 0; }
.pp-notes li { display: grid; grid-template-columns: 30px minmax(0, 1fr); gap: 4px 14px; padding: 18px 0; border-top: 1px solid var(--line); }
.pp-notes li:last-child { border-bottom: 1px solid var(--line); }
.pp-notes li::before { content: attr(data-n); grid-row: 1 / span 3; width: 26px; height: 26px; display: grid; place-items: center; border: 1px solid var(--line-strong, var(--line)); border-radius: 50%; font-family: var(--font-mono); font-size: 12px; color: var(--copper-ink); }
.pp-notes b { font-size: 17px; color: var(--text-strong); }
.pp-notes p { grid-column: 2; margin: 4px 0 0; font-size: 15px; line-height: 1.65; color: var(--text-2); }

/* ---- 3. the dial ------------------------------------------------------------------------ */
.pp-dial { display: grid; grid-template-columns: minmax(0, 300px) minmax(0, 1fr); gap: clamp(28px, 5vw, 72px); align-items: center; }
.pp-knob { display: block; width: 100%; max-width: 250px; margin-inline: auto; }
.pp-knob-arc { fill: none; stroke: var(--line-strong, var(--line)); stroke-width: 1.5; }
.pp-knob-ticks line { stroke: var(--text-muted); stroke-width: 2.5; stroke-linecap: round; transition: stroke var(--dur-1) var(--ease-out); }
.pp-knob-body { fill: var(--surface); stroke: var(--line-strong, var(--line)); stroke-width: 1.5; }
.pp-knob-hand { transform-box: view-box; transform-origin: 100px 100px; transition: transform 240ms var(--ease-out); }
.pp-knob-hand line { stroke: var(--copper-ink); stroke-width: 5; stroke-linecap: round; }
.pp-knob-hand circle { fill: var(--copper-ink); }
#pp-pm-s:checked ~ .pp-knob-box .pp-knob-hand { transform: rotate(-60deg); }
#pp-pm-o:checked ~ .pp-knob-box .pp-knob-hand { transform: rotate(60deg); }
#pp-pm-s:checked ~ .pp-knob-box .pp-knob-ticks line:nth-child(1),
#pp-pm-d:checked ~ .pp-knob-box .pp-knob-ticks line:nth-child(2),
#pp-pm-o:checked ~ .pp-knob-box .pp-knob-ticks line:nth-child(3) { stroke: var(--copper-ink); }
.pp-knob-labels { display: flex; justify-content: space-between; gap: 8px; max-width: 290px; margin: 6px auto 0; }
.pp-knob-labels label { display: inline-flex; align-items: center; min-height: 40px; padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px; font-family: var(--font-mono); font-size: 13px; color: var(--text-2); cursor: pointer; user-select: none; transition: border-color var(--dur-1) var(--ease-out), color var(--dur-1) var(--ease-out), background-color var(--dur-1) var(--ease-out); }
#pp-pm-s:checked ~ .pp-knob-box label[for="pp-pm-s"],
#pp-pm-d:checked ~ .pp-knob-box label[for="pp-pm-d"],
#pp-pm-o:checked ~ .pp-knob-box label[for="pp-pm-o"] { border-color: var(--copper-ink); color: var(--text-strong); background: var(--tint-05); }
#pp-pm-s:focus-visible ~ .pp-knob-box label[for="pp-pm-s"],
#pp-pm-d:focus-visible ~ .pp-knob-box label[for="pp-pm-d"],
#pp-pm-o:focus-visible ~ .pp-knob-box label[for="pp-pm-o"] { outline: 2px solid var(--copper-ink); outline-offset: 2px; }
.pp-mode { display: none; }
#pp-pm-s:checked ~ .pp-modes .m-s, #pp-pm-d:checked ~ .pp-modes .m-d, #pp-pm-o:checked ~ .pp-modes .m-o { display: block; animation: pp-in 220ms var(--ease-out); }
@keyframes pp-in { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.pp-mode pre { border: 1px solid var(--line); border-radius: 12px; }
.pp-mode h3 { margin: 22px 0 8px; font-size: clamp(20px, 2vw, 24px); color: var(--text-strong); }
.pp-mode p { margin: 0; max-width: 56ch; font-size: 16px; line-height: 1.7; color: var(--text-2); }

.pp-calc { margin-top: clamp(40px, 5vw, 64px); border: 1px solid var(--line); border-radius: 18px; padding: clamp(20px, 3vw, 32px); background: var(--bg-alt); }
.pp-calc-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 8px 24px; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.pp-calc-head h3 { margin: 0; font-size: 20px; color: var(--text-strong); }
.pp-formula { margin: 0; font-size: 15px; color: var(--text-2); }
.pp-formula code { font-family: var(--font-mono); font-size: 14px; color: var(--copper-ink); background: none; padding: 0; }
.pp-calc-body { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 220px); gap: 24px 32px; align-items: end; padding-top: 20px; }
.pp-range { display: block; cursor: pointer; }
.pp-range > span { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; font-size: 14.5px; font-weight: 600; color: var(--text-strong); }
.pp-range output { font-family: var(--font-mono); font-weight: 600; color: var(--copper-ink); unicode-bidi: isolate; }
.pp-range input { display: block; width: 100%; height: 36px; margin: 6px 0 2px; accent-color: var(--copper-ink); cursor: pointer; }
.pp-range small { display: block; font-size: 13px; line-height: 1.5; color: var(--text-muted); min-height: 3em; }
.pp-result { align-self: stretch; display: flex; flex-direction: column; justify-content: center; padding-inline-start: 28px; border-inline-start: 1px solid var(--line); }
.pp-result span { font-family: var(--font-mono); font-size: 12.5px; color: var(--text-muted); }
.pp-result strong { font-family: var(--font-mono); font-size: clamp(44px, 5vw, 64px); line-height: 1.05; font-weight: 600; color: var(--text-strong); font-variant-numeric: tabular-nums; }
.pp-calc-cmd { margin-top: 20px; border: 1px solid var(--line); border-radius: 12px; }
.pp-calc-note { margin: 12px 0 0; font-size: 13.5px; line-height: 1.6; color: var(--text-muted); }

.pp-settings { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 clamp(24px, 4vw, 48px); margin: clamp(32px, 4vw, 48px) 0 0; }
.pp-settings > div { padding: 16px 0 18px; border-top: 1px solid var(--line); }
.pp-settings dt { font-family: var(--font-mono); font-size: 14px; color: var(--copper-ink); }
.pp-settings dd { margin: 6px 0 0; font-size: 15px; line-height: 1.65; color: var(--text-2); }

/* ---- 4. the two lanes -------------------------------------------------------------------- */
.pp-lanes { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.pp-lane { border: 1px solid var(--line); border-radius: 18px; padding: clamp(20px, 2.6vw, 28px); background: var(--surface); }
.pp-lane h3 { margin: 0; font-size: 21px; color: var(--text-strong); }
.pp-lane > p { margin: 0; font-size: 15px; line-height: 1.7; color: var(--text-2); }
.pp-hops { list-style: none; display: flex; flex-wrap: wrap; align-items: center; gap: 10px 0; margin: 18px 0 18px; padding: 0 0 18px; border-bottom: 1px solid var(--line); }
.pp-hops li { display: inline-flex; align-items: center; }
.pp-hops li:not(:last-child)::after { content: '\2192'; margin: 0 8px; font-family: var(--font-mono); font-size: 13px; color: var(--text-muted); }
html[dir="rtl"] .pp-hops li:not(:last-child)::after { content: '\2190'; }
.pp-hops span { font-family: var(--font-mono); font-size: 13px; padding: 5px 10px; border: 1px solid var(--line-strong, var(--line)); border-radius: 8px; color: var(--text-strong); background: var(--bg); }
.pp-hops li:first-child span { font-family: var(--font-body); border-style: dashed; color: var(--text-2); }
.pp-hops .is-cache span { border-color: var(--patina-ink); color: var(--patina-ink); }
.pp-hops .is-cache small { margin-inline-start: 6px; font-size: 12px; color: var(--patina-ink); }

.pp-layers { list-style: none; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0 28px; margin: clamp(32px, 4vw, 48px) 0 0; padding: 0; }
.pp-layers li { padding: 18px 0 20px; border-top: 2px solid var(--text-strong); }
.pp-layers b { display: block; font-size: 17px; line-height: 1.35; color: var(--text-strong); }
.pp-layers p { margin: 8px 0 0; font-size: 15px; line-height: 1.65; color: var(--text-2); }
.pp-layers .pp-link { margin-top: 10px; font-size: 14.5px; }

/* ---- 5. the readings ----------------------------------------------------------------------- */
.pp-gauges { list-style: none; margin: 0; padding: 0; border-bottom: 1px solid var(--line); }
.pp-gauges li { display: grid; grid-template-columns: minmax(0, 20rem) minmax(0, 1fr); gap: 6px 28px; align-items: baseline; padding: 15px 0; border-top: 1px solid var(--line); transition: background-color var(--dur-1) var(--ease-out); }
.pp-gauges code { justify-self: start; font-family: var(--font-mono); font-size: 13.5px; padding: 3px 9px; border-radius: 6px; background: var(--well); color: var(--text-strong); word-break: break-word; }
.pp-gauges span { font-size: 15.5px; line-height: 1.6; color: var(--text-2); }
.pp-after { margin: 28px 0 0; font-size: 16px; line-height: 1.7; color: var(--text-2); display: flex; flex-wrap: wrap; gap: 4px 12px; align-items: baseline; }

/* ---- pointer, motion ------------------------------------------------------------------------ */
@media (hover: hover) and (pointer: fine) {
    .pp-seg label:hover { color: var(--text-strong); }
    .pp-knob-labels label:hover { border-color: var(--line-strong, var(--line)); color: var(--text-strong); }
    .pp-link:hover span { transform: translateX(3px); }
    html[dir="rtl"] .pp-link:hover span { transform: scaleX(-1) translateX(3px); }
    .pp-gauges li:hover { background-color: var(--tint-03); }
    .pp-conf:has(.pp-notes li[data-n="1"]:hover) .pp-ln[data-n="1"],
    .pp-conf:has(.pp-notes li[data-n="2"]:hover) .pp-ln[data-n="2"],
    .pp-conf:has(.pp-notes li[data-n="3"]:hover) .pp-ln[data-n="3"],
    .pp-conf:has(.pp-notes li[data-n="4"]:hover) .pp-ln[data-n="4"],
    .pp-conf:has(.pp-notes li[data-n="5"]:hover) .pp-ln[data-n="5"] { background: var(--tint-05); border-left-color: var(--copper-ink); }
}
@media (prefers-reduced-motion: reduce) {
    .pp-bar, .pp-wf-track::after, .pp-knob-hand, .pp-link span { transition: background-color var(--dur-1) linear; transition-delay: 0ms !important; }
    html.anim-ready .pp-wf:not(.revealed) .pp-bar { --w: var(--bw); }
    #pp-pm-s:checked ~ .pp-modes .m-s, #pp-pm-d:checked ~ .pp-modes .m-d, #pp-pm-o:checked ~ .pp-modes .m-o { animation: none; }
}

/* ---- narrow ---------------------------------------------------------------------------------- */
@media (max-width: 1080px) {
    .pp-layers { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .pp-calc-body { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
    .pp-result { grid-column: 1 / -1; flex-direction: row; align-items: baseline; justify-content: space-between; padding: 16px 0 0; border-inline-start: 0; border-top: 1px solid var(--line); }
}
@media (max-width: 900px) {
    .pp-conf, .pp-dial, .pp-lanes { grid-template-columns: minmax(0, 1fr); }
    .pp-file { position: static; }
}
@media (max-width: 760px) {
    .pp-wf-top, .pp-wf-foot { padding-inline: 16px; }
    .pp-wf-rows { padding-inline: 16px; }
    .pp-wf-row { grid-template-columns: minmax(0, 1fr); }
    .pp-wf-label { padding: 12px 0 8px; min-height: 0; }
    .pp-wf-track { height: 22px; margin-bottom: 12px; }
    .pp-seg { width: 100%; }
    .pp-seg label { flex: 1 1 auto; justify-content: center; text-align: center; padding-inline: 10px; }
    .pp-axis { margin-inline-start: 0; }
    .pp-calc-body { grid-template-columns: minmax(0, 1fr); }
    .pp-range small { min-height: 0; }
    .pp-settings { grid-template-columns: minmax(0, 1fr); }
    .pp-gauges li { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 560px) {
    .pp-layers { grid-template-columns: minmax(0, 1fr); }
}

/* Arabic in the mono stack takes Plex Mono's full-width spaces; Arabic labels take the body face,
   code and figures stay mono. */
html[dir="rtl"] .pp-tag, html[dir="rtl"] .pp-axis, html[dir="rtl"] .pp-result span { font-family: var(--font-body); }