/* Self-hosted fonts (latin + latin-ext), same files Google Fonts served. */
@font-face {
  font-family: 'Archivo';
  font-style: italic;
  font-weight: 100 900;
  font-stretch: 62% 125%;
  font-display: swap;
  src: url(../fonts/archivo-italic-latin-ext.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Archivo';
  font-style: italic;
  font-weight: 100 900;
  font-stretch: 62% 125%;
  font-display: swap;
  src: url(../fonts/archivo-italic-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Archivo';
  font-style: normal;
  font-weight: 100 900;
  font-stretch: 62% 125%;
  font-display: swap;
  src: url(../fonts/archivo-normal-latin-ext.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Archivo';
  font-style: normal;
  font-weight: 100 900;
  font-stretch: 62% 125%;
  font-display: swap;
  src: url(../fonts/archivo-normal-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Martian Mono';
  font-style: normal;
  font-weight: 100 800;
  font-stretch: 75% 112.5%;
  font-display: swap;
  src: url(../fonts/martian-mono-normal-latin-ext.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Martian Mono';
  font-style: normal;
  font-weight: 100 800;
  font-stretch: 75% 112.5%;
  font-display: swap;
  src: url(../fonts/martian-mono-normal-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* ==========================================================================
   Hamza Sultan — "Drafting Table" design system
   Spec: /docs/design/DESIGN.md
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root {
  /* Colour (OKLCH). No pure black or white; every neutral is tinted. */
  --vellum: oklch(0.958 0.011 85);
  --vellum-2: oklch(0.925 0.014 84);
  --rule: oklch(0.84 0.014 80);
  --graphite: oklch(0.215 0.013 255);
  --graphite-2: oklch(0.43 0.012 255);
  --graphite-3: oklch(0.515 0.01 255);
  --on-ink-2: oklch(0.72 0.01 255);
  --ink-rule: oklch(0.34 0.012 255);
  --cyan: oklch(0.305 0.085 258);
  --cyan-deep: oklch(0.245 0.07 258);
  --cyan-line: oklch(0.40 0.075 256);
  --chalk: oklch(0.945 0.018 245);
  --chalk-2: oklch(0.80 0.035 248);
  --redline: oklch(0.635 0.195 33);
  --redline-ink: oklch(0.525 0.185 32);
  --redline-hi: oklch(0.74 0.16 38);

  /* Type */
  --font: 'Archivo', 'Helvetica Neue', Arial, sans-serif;
  --mono: 'Martian Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --fs-micro: 0.6875rem;
  --fs-xs: 0.8125rem;
  --fs-sm: 0.9375rem;
  --fs-base: 1.0625rem;
  --fs-md: clamp(1.125rem, 0.95rem + 0.6vw, 1.5rem);
  --fs-lg: clamp(1.5rem, 1.1rem + 1.4vw, 2.5rem);
  --fs-xl: clamp(2.25rem, 1.2rem + 3.6vw, 5rem);
  --fs-2xl: clamp(3rem, 1rem + 7vw, 9rem);
  --fs-mega: clamp(3.5rem, 13.2vw, 17rem);

  /* Space (4pt) */
  --s-1: 4px; --s-2: 8px; --s-3: 12px; --s-4: 16px; --s-5: 24px; --s-6: 32px;
  --s-7: 48px; --s-8: 64px; --s-9: 96px; --s-10: 128px; --s-11: 192px;

  /* Grid */
  --margin: clamp(16px, 3.2vw, 56px);
  --gutter: clamp(12px, 1.6vw, 24px);
  --maxw: 1680px;
  --hdr-h: 64px;

  /* Shape */
  --hair: 1px;
  --r-chip: 2px;
  --r-pill: 999px;

  /* Motion */
  --dur-1: 160ms;
  --dur-2: 420ms;
  --dur-3: 900ms;
  --dur-4: 1400ms;
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --ease-inout: cubic-bezier(.65, 0, .35, 1);

  /* Layers */
  --z-grain: 60;
  --z-hdr: 50;
  --z-ladder: 45;
  --z-peek: 40;
  --z-cursor: 90;
  --z-loader: 100;
}

/* ---------- 2. Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-padding-top: var(--hdr-h); }
html:not(.lenis) { scroll-behavior: smooth; }
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-stopped { overflow: clip; }
body {
  background: var(--vellum);
  color: var(--graphite);
  font-family: var(--font);
  font-size: var(--fs-base);
  line-height: 1.55;
  font-variation-settings: "wdth" 100;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
ul, ol { list-style: none; }
::selection { background: var(--redline); color: var(--vellum); }
:focus-visible { outline: 2px solid var(--redline); outline-offset: 3px; }
[data-surface="cyan"] :focus-visible, [data-surface="cyan-deep"] :focus-visible, [data-surface="ink"] :focus-visible { outline-color: var(--redline-hi); }

.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip { position: fixed; left: var(--margin); top: -100px; z-index: 200; background: var(--redline-ink); color: var(--vellum); padding: var(--s-3) var(--s-4); font-family: var(--mono); font-size: var(--fs-xs); }
.skip:focus { top: var(--s-3); }

/* Grain: static tile, no blend mode (cheap to composite) */
.grain {
  position: fixed; inset: 0; z-index: var(--z-grain); pointer-events: none; opacity: .06;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- 3. Type primitives ---------- */
.mono, .label {
  font-family: var(--mono);
  font-variation-settings: "wdth" 87.5;
  font-size: var(--fs-micro);
  font-weight: 400;
  letter-spacing: .08em;
  text-transform: uppercase;
  line-height: 1.5;
}
.label { color: var(--graphite-2); }
.statement {
  font-variation-settings: "wdth" 125;
  font-weight: 300;
  letter-spacing: -.02em;
  line-height: 1.05;
}
.numeral {
  font-variation-settings: "wdth" 62;
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: .9;
  font-feature-settings: "tnum" 1;
}
.h-sec {
  font-size: var(--fs-xl);
  font-variation-settings: "wdth" 125;
  font-weight: 300;
  letter-spacing: -.035em;
  line-height: .98;
  text-wrap: balance;
}
.h-sec em, .statement em { font-style: italic; color: var(--redline-ink); }
[data-surface="cyan"] .h-sec em, [data-surface="cyan"] .statement em,
[data-surface="cyan-deep"] .h-sec em, [data-surface="ink"] .h-sec em { color: var(--redline-hi); }

/* ---------- 4. Layout ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--margin); }
.grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); }

[data-surface="cyan"] { background: var(--cyan); color: var(--chalk); }
[data-surface="cyan-deep"] { background: var(--cyan-deep); color: var(--chalk); }
[data-surface="ink"] { background: var(--graphite); color: var(--vellum); }
[data-surface="vellum"] { background: var(--vellum); color: var(--graphite); }
[data-surface="cyan"] .label, [data-surface="cyan-deep"] .label { color: var(--chalk-2); }
[data-surface="ink"] .label { color: var(--on-ink-2); }

/* Registration mark */
.reg { position: absolute; width: 11px; height: 11px; pointer-events: none; color: currentColor; opacity: .7; }
.reg::before, .reg::after { content: ""; position: absolute; background: currentColor; }
.reg::before { left: 5px; top: 0; width: 1px; height: 11px; }
.reg::after { top: 5px; left: 0; height: 1px; width: 11px; }

/* Section head */
.sec-head { padding-block: clamp(96px, 12vw, 192px) var(--s-7); border-bottom: 2px solid currentColor; align-items: end; row-gap: var(--s-5); }
.sec-head__meta { grid-column: 1 / 4; display: flex; flex-direction: column; gap: var(--s-2); align-self: start; }
.sec-head__meta .n { font-family: var(--mono); font-size: var(--fs-micro); letter-spacing: .08em; color: var(--redline-ink); }
[data-surface="ink"] .sec-head__meta .n, [data-surface="cyan"] .sec-head__meta .n { color: var(--redline-hi); }
.sec-head__body { grid-column: 4 / -1; }
.sec-head__body p { margin-top: var(--s-5); max-width: 52ch; font-size: var(--fs-md); color: var(--graphite-2); line-height: 1.45; }
[data-surface="ink"] .sec-head__body p { color: var(--on-ink-2); }
[data-surface="cyan"] .sec-head__body p { color: var(--chalk-2); }

/* Buttons */
.btn-bracket {
  position: relative; display: inline-flex; align-items: center; gap: var(--s-3);
  min-height: 44px; padding: var(--s-3) var(--s-5);
  font-family: var(--mono); font-variation-settings: "wdth" 87.5; font-size: var(--fs-micro); letter-spacing: .08em; text-transform: uppercase;
  transition: color var(--dur-1) ease;
}
.btn-bracket::before, .btn-bracket::after {
  content: ""; position: absolute; width: 10px; height: 10px; border: 1px solid currentColor;
  transition: transform var(--dur-2) var(--ease-out);
}
.btn-bracket::before { left: 0; top: 0; border-right: 0; border-bottom: 0; }
.btn-bracket::after { right: 0; bottom: 0; border-left: 0; border-top: 0; }
.btn-bracket:hover::before { transform: translate(-4px, -4px); }
.btn-bracket:hover::after { transform: translate(4px, 4px); }
.btn-bracket .arr { transition: transform var(--dur-2) var(--ease-out); }
.btn-bracket:hover .arr { transform: translateX(4px); }

.btn-solid {
  display: inline-flex; align-items: center; gap: var(--s-3); min-height: 48px; padding: 0 var(--s-6);
  border-radius: var(--r-pill); background: var(--redline-ink); color: var(--vellum);
  font-family: var(--mono); font-variation-settings: "wdth" 87.5; font-size: var(--fs-micro); letter-spacing: .08em; text-transform: uppercase;
  transition: background var(--dur-1) ease;
}
.btn-solid:hover { background: var(--graphite); }
[data-surface="cyan"] .btn-solid { background: var(--chalk); color: var(--cyan-deep); }
[data-surface="cyan"] .btn-solid:hover { background: var(--redline-hi); color: var(--cyan-deep); }

/* ---------- 5. Loader ---------- */
.loader { display: none; }
html.loading .loader {
  display: flex; position: fixed; inset: 0; z-index: var(--z-loader);
  flex-direction: column; justify-content: center; gap: var(--s-4);
  padding-inline: var(--margin); background: var(--cyan); color: var(--chalk);
}
.loader__count { font-size: clamp(3rem, 8vw, 7rem); }
.loader__line { position: relative; height: 11px; display: flex; align-items: center; }
.loader__line i { display: block; height: 1px; width: 100%; background: currentColor; transform-origin: left; transform: scaleX(0); }
.loader__line::before, .loader__line::after { content: ""; position: absolute; top: 0; width: 1px; height: 11px; background: currentColor; }
.loader__line::before { left: 0; }
.loader__line::after { right: 0; }
.loader__meta { display: flex; justify-content: space-between; color: var(--chalk-2); }
html.loading body { overflow: hidden; }

/* ---------- 6. Header ---------- */
.hdr {
  position: fixed; inset: 0 0 auto 0; z-index: var(--z-hdr); height: var(--hdr-h);
  color: var(--chalk);
  transition: transform var(--dur-2) var(--ease-out), color var(--dur-2) ease, background-color var(--dur-2) ease;
}
.hdr.is-hidden { transform: translateY(-100%); }
html[data-hsurf="vellum"] .hdr { color: var(--graphite); }
html[data-hsurf="ink"] .hdr { color: var(--vellum); }
.hdr__inner { height: 100%; align-items: center; border-bottom: var(--hair) solid color-mix(in oklch, currentColor 22%, transparent); }
.hdr__logo { grid-column: 1 / 3; display: inline-flex; align-items: center; gap: 2px; font-weight: 600; font-size: var(--fs-sm); letter-spacing: .02em; font-variation-settings: "wdth" 112; min-height: 44px; }
.hdr__logo b { font-weight: 300; transition: transform var(--dur-2) var(--ease-out); }
.hdr__logo:hover b:first-child { transform: translateX(-3px); }
.hdr__logo:hover b:last-child { transform: translateX(3px); }
.hdr__nav { grid-column: 5 / 9; }
.hdr__nav ul { display: flex; gap: clamp(16px, 2.4vw, 40px); }
.hdr__nav a { position: relative; font-size: var(--fs-sm); display: inline-flex; min-height: 44px; align-items: center; }
.hdr__nav sup { font-family: var(--mono); font-size: .6em; margin-left: 2px; opacity: .6; transform: translateY(-2px); }
.hdr__nav a::after { content: ""; position: absolute; left: 0; right: 0; bottom: 10px; height: 1px; background: currentColor; transform: scaleX(0); transform-origin: right; transition: transform var(--dur-2) var(--ease-out); }
.hdr__nav a:hover::after, .hdr__nav a[aria-current="true"]::after { transform: scaleX(1); transform-origin: left; }
.hdr__meta { grid-column: 9 / 12; line-height: 1.4; }
.hdr__meta span { display: block; opacity: .8; }
.hdr__status { grid-column: 12 / 13; justify-self: end; display: inline-flex; align-items: center; gap: var(--s-2); }
.hdr__status::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: oklch(0.72 0.15 150); box-shadow: 0 0 0 0 oklch(0.72 0.15 150 / .5); animation: pulse 2.4s infinite; }
@keyframes pulse { 70% { box-shadow: 0 0 0 8px oklch(0.72 0.15 150 / 0); } 100% { box-shadow: 0 0 0 0 oklch(0.72 0.15 150 / 0); } }

/* ---------- 7. Tick ladder ---------- */
.ladder { position: fixed; right: var(--s-4); top: 50%; transform: translateY(-50%); z-index: var(--z-ladder); color: var(--chalk); transition: color var(--dur-2) ease; }
html[data-hsurf="vellum"] .ladder { color: var(--graphite); }
html[data-hsurf="ink"] .ladder { color: var(--vellum); }
.ladder ol { display: flex; flex-direction: column; gap: var(--s-1); }
.ladder a { display: flex; align-items: center; justify-content: flex-end; gap: var(--s-2); min-height: 24px; min-width: 44px; }
.ladder a span { font-family: var(--mono); font-size: 10px; letter-spacing: .06em; opacity: 0; transform: translateX(4px); transition: opacity var(--dur-1), transform var(--dur-2) var(--ease-out); }
.ladder a i { display: block; height: 1px; width: 10px; background: currentColor; opacity: .55; transition: width var(--dur-2) var(--ease-out), background var(--dur-1), opacity var(--dur-1); }
.ladder a:hover span, .ladder a:focus-visible span { opacity: 1; transform: none; }
.ladder a span { background: var(--graphite); color: var(--vellum); padding: 3px 6px; }
.ladder a[aria-current="true"] i { width: 26px; opacity: 1; background: var(--redline); }

/* ---------- 8. Cursor ---------- */
.cursor { display: none; }
html.has-cursor .cursor { display: block; position: fixed; inset: 0; pointer-events: none; z-index: var(--z-cursor); }
.cursor__x, .cursor__y { position: absolute; background: var(--chalk); opacity: 0; transition: opacity var(--dur-2) ease; }
.cursor__x { left: 0; right: 0; height: 1px; top: 0; }
.cursor__y { top: 0; bottom: 0; width: 1px; left: 0; }
.cursor.is-blueprint .cursor__x, .cursor.is-blueprint .cursor__y { opacity: .16; }
.cursor { color: var(--graphite); }
.cursor.is-blueprint, .cursor.is-ink { color: var(--chalk); }
.cursor__dot { position: absolute; left: 0; top: 0; width: 21px; height: 21px; margin: -10px 0 0 -10px; transition: color var(--dur-1); }
.cursor__dot::before, .cursor__dot::after { content: ""; position: absolute; background: currentColor; }
.cursor__dot::before { left: 10px; top: 0; width: 1px; height: 21px; }
.cursor__dot::after { top: 10px; left: 0; height: 1px; width: 21px; }
.cursor__read { position: absolute; left: 0; top: 0; transform: translate(16px, 14px); font-family: var(--mono); font-size: 9px; letter-spacing: .06em; color: currentColor; opacity: .8; white-space: nowrap; }
.cursor__chip { position: absolute; left: 0; top: 0; transform: translate(16px, -30px) scale(.6); opacity: 0; transform-origin: left bottom; padding: 5px 9px; background: var(--redline); color: var(--vellum); font-family: var(--mono); font-size: 10px; letter-spacing: .08em; white-space: nowrap; transition: opacity var(--dur-1) ease, transform var(--dur-2) var(--ease-out); }
.cursor.has-label .cursor__chip { opacity: 1; transform: translate(16px, -30px) scale(1); }
html.has-cursor.cursor-hidden .cursor { opacity: 0; }

/* ---------- 9. Hero ---------- */
.hero { position: relative; min-height: 100svh; min-height: max(100svh, 640px); display: flex; flex-direction: column; overflow: hidden; }
.hero__grid { position: absolute; inset: 0; pointer-events: none; }
.hero__grid .wrap { height: 100%; }
.hero__grid .grid { height: 100%; }
.hero__grid span { border-left: var(--hair) solid var(--cyan-line); height: 100%; transform-origin: top; }
.hero__grid span:last-child { border-right: var(--hair) solid var(--cyan-line); }
.hero__inner { position: relative; flex: 1; display: flex; flex-direction: column; padding-top: calc(var(--hdr-h) + var(--s-5)); padding-bottom: var(--s-6); }
.hero__fig { display: flex; justify-content: space-between; gap: var(--s-4); color: var(--chalk-2); }
.hero__mark { position: relative; margin-block: auto; padding-block: var(--s-8) var(--s-7); }
.wordmark {
  font-size: var(--fs-mega);
  font-weight: 800;
  line-height: .86;
  letter-spacing: -.035em;
  text-transform: uppercase;
  --wdth: 100;
  font-variation-settings: "wdth" var(--wdth);
}
.wordmark .ln { display: block; overflow: hidden; padding-bottom: .04em; }
.wordmark .ln > span { display: inline-block; white-space: nowrap; }
.wordmark .ln:nth-child(2) { text-align: right; }
.dim {
  position: absolute; left: 0; top: var(--s-5); height: 11px; display: flex; align-items: center; gap: var(--s-3);
  color: var(--redline-hi); width: var(--dim-w, 60%); transform-origin: left;
}
.dim::before, .dim::after { content: ""; position: absolute; top: 0; width: 1px; height: 11px; background: currentColor; }
.dim::before { left: 0; }
.dim::after { right: 0; }
.dim i { flex: 1; height: 1px; background: currentColor; }
.dim b { font-family: var(--mono); font-weight: 400; font-size: var(--fs-micro); letter-spacing: .08em; white-space: nowrap; font-variant-numeric: tabular-nums; }
.hero__foot { align-items: end; row-gap: var(--s-6); }
.hero__reg-tl { left: var(--margin); top: calc(var(--hdr-h) + 6px); }
.hero__reg-tr { right: var(--margin); top: calc(var(--hdr-h) + 6px); }
.hero__cue { position: absolute; left: 50%; bottom: var(--s-5); transform: translateX(-50%); color: var(--chalk-2); display: none; }

/* ---------- 10. Marquee ---------- */
.marquee { overflow: hidden; border-block: 2px solid var(--graphite); padding-block: clamp(14px, 2vw, 26px); background: var(--vellum); }
.marquee__track { display: flex; width: max-content; will-change: transform; }
.marquee__set { display: flex; align-items: center; flex-shrink: 0; }
.marquee__set span { font-size: clamp(2.25rem, 1rem + 5vw, 5.5rem); text-transform: uppercase; padding-inline: clamp(16px, 2vw, 36px); white-space: nowrap; }
.marquee__set span:nth-child(odd) { color: transparent; -webkit-text-stroke: 1px var(--graphite); }
.marquee__set i { width: clamp(10px, 1vw, 16px); height: clamp(10px, 1vw, 16px); background: var(--redline); transform: rotate(45deg); flex-shrink: 0; }

/* ---------- 11. Leaks ---------- */
.schematic { margin-top: var(--s-8); overflow-x: auto; scrollbar-width: thin; }
.schematic svg { width: 100%; min-width: 760px; height: auto; overflow: visible; }
.schematic .pipe { fill: none; stroke: var(--graphite); stroke-width: 1.5; }
.schematic .node { fill: var(--vellum); stroke: var(--graphite); stroke-width: 1.5; }
.schematic .node-t { font-family: var(--mono); font-size: 11px; letter-spacing: .08em; fill: var(--graphite); }
.schematic .node-n { font-family: var(--mono); font-size: 10px; letter-spacing: .08em; fill: var(--graphite-3); }
.schematic .tick { stroke: var(--graphite); stroke-width: 1; }
.schematic .leak line { stroke: var(--redline); stroke-width: 1.5; }
.schematic .leak circle { fill: var(--redline); transform-box: fill-box; transform-origin: center; transition: transform var(--dur-2) var(--ease-out); }
.schematic .leak text { font-family: var(--mono); font-size: 10px; letter-spacing: .08em; fill: var(--redline-ink); transition: fill var(--dur-1); }
.schematic .leak .ring { fill: none; stroke: var(--redline); stroke-width: 1; opacity: 0; transition: opacity var(--dur-2), transform var(--dur-2) var(--ease-out); transform: scale(.4); }
.schematic .leak { cursor: pointer; }
.schematic .leak.is-lit circle:not(.ring) { transform: scale(1.5); }
.schematic .leak.is-lit .ring { opacity: 1; transform: scale(1); }
.schematic .leak.is-lit text { fill: var(--graphite); }
.schematic figcaption { margin-top: var(--s-4); color: var(--graphite-3); }

.leaks { margin-top: var(--s-8); border-top: var(--hair) solid var(--graphite); }
.leak-row { padding-block: var(--s-7); border-bottom: var(--hair) solid var(--rule); row-gap: var(--s-5); align-items: start; position: relative; transition: background-color var(--dur-2) ease; }
.leak-row::before { content: ""; position: absolute; left: 0; top: -1px; height: 2px; width: 100%; background: var(--redline); transform: scaleX(0); transform-origin: left; transition: transform var(--dur-3) var(--ease-out); }
.leak-row.is-lit::before { transform: scaleX(1); }
.leak-row__n { grid-column: 1 / 2; color: var(--redline-ink); padding-top: .9em; }
.leak-row__title { text-wrap: balance; grid-column: 2 / 6; font-size: clamp(1.6rem, 1.1rem + 1.6vw, 2.6rem); }
.leak-row__col { grid-column: span 2; }
.leak-row__col .label { display: block; margin-bottom: var(--s-2); }
.leak-row__col p { font-size: var(--fs-sm); color: var(--graphite-2); }
.leak-row__col--fix { grid-column: 8 / 11; }
.leak-row__col--fix p { color: var(--graphite); }
.leak-row__proof { grid-column: 11 / -1; display: flex; flex-direction: column; }
.leak-row__proof a { display: block; padding: var(--s-2) 0; border-bottom: var(--hair) solid var(--rule); font-size: var(--fs-sm); transition: color var(--dur-1), padding var(--dur-2) var(--ease-out); }
.leak-row__proof a b { display: block; font-family: var(--mono); font-weight: 400; font-size: var(--fs-micro); letter-spacing: .06em; color: var(--redline-ink); }
.leak-row__proof a:hover { color: var(--redline-ink); padding-left: var(--s-2); }

/* ---------- 12. Work sheets ---------- */
.work-intro__count { margin-top: var(--s-5); display: flex; gap: var(--s-5); color: var(--graphite-3); }
.sheets { padding-block: var(--s-8) var(--s-10); display: flex; flex-direction: column; gap: var(--s-8); }
.sheet {
  position: relative; background: var(--vellum); border: var(--hair) solid var(--graphite);
  transform-origin: 50% 0; --dim: 0;
}
.sheet::after { content: ""; position: absolute; inset: 0; background: var(--graphite); opacity: var(--dim); pointer-events: none; }
.sheet__top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--s-2) var(--s-5); padding: var(--s-3) var(--s-5); border-bottom: var(--hair) solid var(--graphite); }
.sheet__top b { font-weight: 400; color: var(--redline-ink); }
.sheet__body { padding: var(--s-5); row-gap: var(--s-5); }
.sheet__media { grid-column: 1 / 9; position: relative; }
.sheet__side { grid-column: 9 / -1; display: flex; flex-direction: column; gap: var(--s-4); }
.sheet__title { font-size: clamp(1.9rem, 1.2rem + 1.9vw, 3.4rem); line-height: .95; }
.sheet__sub { font-size: var(--fs-sm); color: var(--graphite-2); margin-top: var(--s-2); }

.browser { position: relative; display: block; border: var(--hair) solid var(--graphite); background: oklch(0.99 0.004 90); }
.browser__bar { display: flex; align-items: center; gap: var(--s-3); padding: 7px var(--s-3); border-bottom: var(--hair) solid var(--graphite); background: var(--vellum-2); }
.browser__bar i { width: 7px; height: 7px; border: 1px solid var(--graphite); border-radius: 50%; }
.browser__url { flex: 1; text-align: center; font-family: var(--mono); font-size: 10px; letter-spacing: .04em; color: var(--graphite-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.browser__go { font-family: var(--mono); font-size: 10px; letter-spacing: .06em; transition: color var(--dur-1); }
.browser:hover .browser__go { color: var(--redline-ink); }
.browser__shot { position: relative; display: block; aspect-ratio: 16 / 7.6; overflow: hidden; }
.browser__shot img { width: 100%; height: 100%; object-fit: cover; object-position: top; transition: transform 1.2s var(--ease-out); }
.browser:hover .browser__shot img { transform: scale(1.02); }
.browser__scan { position: absolute; left: 0; right: 0; top: 0; height: 2px; background: var(--redline); opacity: 0; pointer-events: none; }
.sheet__media .reg { color: var(--graphite); }
.sheet__media .r1 { left: -6px; top: -6px; } .sheet__media .r2 { right: -6px; top: -6px; }
.sheet__media .r3 { left: -6px; bottom: -6px; } .sheet__media .r4 { right: -6px; bottom: -6px; }
.corner { position: absolute; font-family: var(--mono); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; padding: 3px 6px; background: var(--graphite); color: var(--vellum); }
.corner--bl { left: var(--s-3); bottom: var(--s-3); }
.corner--br { right: var(--s-3); bottom: var(--s-3); }

.metric { border-top: 2px solid var(--graphite); padding-top: var(--s-3); }
.metric__v { display: flex; align-items: baseline; gap: var(--s-3); font-size: clamp(2.6rem, 1.8rem + 2.4vw, 4.5rem); }
.metric__v .from { color: var(--graphite-3); }
.metric__v .hi { color: var(--redline-ink); }
.metric__v .arrow { flex: 1; align-self: center; position: relative; height: 1px; background: var(--redline); min-width: 32px; max-width: 120px; }
.metric__v .arrow::after { content: ""; position: absolute; right: 0; top: -4px; border: 4px solid transparent; border-left: 7px solid var(--redline); border-right: 0; }
.metric .label { margin-top: var(--s-2); display: block; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tags li { font-family: var(--mono); font-size: 10px; letter-spacing: .04em; padding: 3px 7px; border: var(--hair) solid var(--rule); border-radius: var(--r-chip); color: var(--graphite-2); }

/* Sticky stacking: JS adds .stack only when the tallest sheet fits the viewport */
.sheets.stack .sheet { position: sticky; top: calc(var(--s-4) + var(--i, 0) * 14px); }

/* ---------- 13. Index ---------- */
.index-sec { padding-bottom: var(--s-10); }
.index-tools { display: flex; justify-content: space-between; align-items: center; gap: var(--s-4); padding-block: var(--s-5); border-bottom: var(--hair) solid var(--ink-rule); }
.toggle { display: inline-flex; border: var(--hair) solid var(--ink-rule); }
.toggle button { min-height: 44px; padding: 0 var(--s-4); font-family: var(--mono); font-variation-settings: "wdth" 87.5; font-size: var(--fs-micro); letter-spacing: .08em; text-transform: uppercase; color: var(--on-ink-2); transition: background var(--dur-1), color var(--dur-1); }
.toggle button[aria-pressed="true"] { background: var(--vellum); color: var(--graphite); }
.index { display: grid; grid-template-columns: 1fr; }
.index__item { border-bottom: var(--hair) solid var(--ink-rule); }
.index__link { display: grid; grid-template-columns: 3rem minmax(0, 4fr) minmax(0, 5fr) minmax(0, 3fr) 2rem; gap: var(--gutter); align-items: center; padding-block: var(--s-5); transition: color var(--dur-1); }
.index__n { color: var(--on-ink-2); }
.index__name { font-size: clamp(1.6rem, 1rem + 2vw, 3rem); font-variation-settings: "wdth" 112; font-weight: 300; letter-spacing: -.02em; line-height: 1; transition: transform var(--dur-3) var(--ease-out), font-variation-settings var(--dur-3) var(--ease-out); }
.index__what { font-size: var(--fs-sm); color: var(--on-ink-2); }
.index__what b { color: var(--vellum); font-weight: 500; }
.index__stack { color: var(--on-ink-2); }
.index__arrow { justify-self: end; transition: transform var(--dur-2) var(--ease-out); }
.index__thumb { display: none; }
.index__link:hover { color: var(--redline-hi); }
.index__link:hover .index__name { transform: translateX(var(--s-3)); font-variation-settings: "wdth" 125; }
.index__link:hover .index__arrow { transform: translate(3px, -3px); }
.badge { display: inline-block; margin-left: var(--s-3); vertical-align: middle; transform: translateY(-.25em); padding: 2px 6px; border: var(--hair) solid currentColor; border-radius: var(--r-chip); font-family: var(--mono); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; font-variation-settings: "wdth" 87.5; }

.index.is-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-6) var(--gutter); padding-top: var(--s-6); }
.index.is-grid .index__item { border: 0; }
.index.is-grid .index__link { grid-template-columns: 1fr; gap: var(--s-2); padding: 0; }
.index.is-grid .index__thumb { display: block; aspect-ratio: 16 / 10; overflow: hidden; border: var(--hair) solid var(--ink-rule); margin-bottom: var(--s-2); }
.index.is-grid .index__thumb img { width: 100%; height: 100%; object-fit: cover; object-position: top left; transition: transform 1s var(--ease-out); }
.index.is-grid .index__link:hover .index__thumb img { transform: scale(1.04); }
.index.is-grid .index__name { font-size: clamp(1.4rem, 1rem + 1vw, 2rem); }
.index.is-grid .index__arrow, .index.is-grid .index__n { display: none; }

.peek { position: fixed; left: 0; top: 0; z-index: var(--z-peek); width: clamp(260px, 24vw, 400px); aspect-ratio: 16 / 10; overflow: hidden; pointer-events: none; opacity: 0; border: var(--hair) solid var(--vellum); background: var(--graphite); transition: opacity var(--dur-2) ease; will-change: transform; }
.peek.is-on { opacity: 1; }
.peek img { width: 100%; height: 100%; object-fit: cover; object-position: top left; }

/* ---------- 14. Process ---------- */
.seq { position: relative; padding-block: var(--s-8) var(--s-10); }
.seq__line { position: absolute; left: 0; right: 0; top: calc(var(--s-8) + 5px); height: 11px; color: var(--graphite); }
.seq__line i { position: absolute; left: 0; right: 0; top: 5px; height: 1px; background: currentColor; transform-origin: left; }
.seq__line::before, .seq__line::after { content: ""; position: absolute; top: 0; width: 1px; height: 11px; background: currentColor; }
.seq__line::before { left: 0; } .seq__line::after { right: 0; }
.seq ol { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); column-gap: var(--gutter); }
.step { position: relative; padding-top: var(--s-7); }
.step::before { content: ""; position: absolute; left: 0; top: 0; width: 1px; height: 21px; background: var(--redline); }
.step .label b { color: var(--redline-ink); font-weight: 400; }
.step h3 { font-size: clamp(1.5rem, 1.1rem + 1.2vw, 2.4rem); margin: var(--s-4) 0 var(--s-3); }
.step p { font-size: var(--fs-sm); color: var(--graphite-2); max-width: 32ch; }

/* ---------- 15. Offer ---------- */
.offer { position: relative; padding-bottom: var(--s-10); overflow: hidden; }
.offer .sec-head { border-bottom-color: var(--cyan-line); }
.offer__body { padding-top: var(--s-8); row-gap: var(--s-8); }
.tform { grid-column: 1 / 8; }
.tform__row { display: flex; gap: var(--s-3); align-items: stretch; flex-wrap: wrap; }
.tform__field { position: relative; flex: 1 1 320px; }
.tform label { display: block; margin-bottom: var(--s-3); color: var(--chalk-2); }
.tform input {
  width: 100%; min-height: 60px; padding: 0 var(--s-5); border-radius: var(--r-pill);
  border: var(--hair) solid var(--chalk-2); background: transparent; color: var(--chalk);
  font-size: var(--fs-md); font-variation-settings: "wdth" 110; transition: border-color var(--dur-1), background var(--dur-1);
}
.tform input::placeholder { color: color-mix(in oklch, var(--chalk-2) 70%, transparent); }
.tform input:focus { outline: none; border-color: var(--chalk); background: oklch(1 0 0 / .04); }
.tform input:focus-visible { outline: 2px solid var(--redline-hi); outline-offset: 3px; }
.tform input[aria-invalid="true"] { border-color: var(--redline-hi); }
.tform .btn-solid { min-height: 60px; align-self: flex-end; }
.tform__msg { min-height: 1.6em; margin-top: var(--s-3); color: var(--redline-hi); }
.tform__msg.is-ok { color: var(--chalk-2); }
.tform__note { margin-top: var(--s-5); color: var(--chalk-2); max-width: 48ch; font-size: var(--fs-sm); }
.covers { grid-column: 9 / -1; border-top: var(--hair) solid var(--cyan-line); }
.covers li { display: grid; grid-template-columns: 3rem 1fr; padding-block: var(--s-4); border-bottom: var(--hair) solid var(--cyan-line); font-size: var(--fs-sm); }
.covers li span { color: var(--redline-hi); }

/* ---------- 16. Contact ---------- */
.contact { position: relative; overflow: hidden; padding-block: clamp(96px, 12vw, 176px) var(--s-6); }
.contact__cta { text-wrap: balance; font-size: clamp(3rem, 1rem + 8vw, 11rem); line-height: .9; }
.contact__row { margin-top: var(--s-8); align-items: center; row-gap: var(--s-6); }
.magnet {
  grid-column: 1 / 4; position: relative; display: grid; place-items: center;
  width: clamp(132px, 12vw, 176px); aspect-ratio: 1; border-radius: 50%;
  background: var(--redline); color: var(--vellum);
  font-family: var(--mono); font-variation-settings: "wdth" 87.5; font-size: var(--fs-micro); letter-spacing: .08em; text-transform: uppercase;
  transition: background var(--dur-1);
}
.magnet:hover { background: var(--chalk); color: var(--cyan-deep); }
.magnet span { display: block; pointer-events: none; }
.contact__mail { grid-column: 4 / 10; display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-4) var(--s-5); }
.contact__mail a.addr { font-size: clamp(1.25rem, 0.9rem + 1.6vw, 2.4rem); font-variation-settings: "wdth" 112; font-weight: 300; border-bottom: 1px solid var(--redline-hi); padding-bottom: 2px; overflow-wrap: anywhere; transition: color var(--dur-1); }
.contact__mail a.addr:hover { color: var(--redline-hi); }
.contact__time { grid-column: 10 / -1; justify-self: end; text-align: right; color: var(--chalk-2); }
.contact__time b { display: block; font-size: clamp(2rem, 1.4rem + 2vw, 3.4rem); color: var(--chalk); font-weight: 800; }
.colophon { margin-top: var(--s-10); padding-top: var(--s-5); border-top: var(--hair) solid var(--cyan-line); display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--s-3) var(--s-6); color: var(--chalk-2); }
.colophon a:hover { color: var(--chalk); }

/* ---------- 17. Motion initial states (only when JS confirms it can animate) ---------- */
html.anim [data-split], html.anim [data-reveal] { visibility: hidden; }
html.anim .hero__grid span { transform: scaleY(0); }
html.anim .wordmark .ln > span { transform: translateY(105%); }
html.anim .dim { transform: scaleX(0); }
html.anim .hero__fig, html.anim .hero__foot > :not(.hero__pitch), html.anim .hdr { opacity: 0; } /* .hero__pitch holds the LCP text: never hidden */

/* ---------- 18. Responsive ---------- */
@media (max-width: 1100px) {
  .hdr__meta { grid-column: 8 / 12; }
  .hdr__nav { grid-column: 3 / 8; }
  .leak-row__title { grid-column: 2 / -1; }
  .leak-row__col { grid-column: 2 / 7; }
  .leak-row__col--fix { grid-column: 7 / -1; }
  .leak-row__proof { grid-column: 2 / -1; flex-direction: row; flex-wrap: wrap; gap: 0 var(--s-6); }
  .sheet__media { grid-column: 1 / -1; }
  .sheet__side { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-5); align-items: start; }
  .sheet__side > :first-child { grid-column: 1 / -1; }
  .tform, .covers { grid-column: 1 / -1; }
  .contact__mail { grid-column: 4 / -1; }
  .contact__time { grid-column: 1 / -1; justify-self: start; text-align: left; }
}
@media (max-width: 900px) {
  .ladder { display: none; }
  .hdr__nav, .hdr__meta { display: none; }
  .hdr__status { grid-column: 7 / -1; }
  .sec-head__meta, .sec-head__body { grid-column: 1 / -1; }
  .index__link { grid-template-columns: 2.25rem minmax(0, 1fr) 1.5rem; row-gap: var(--s-2); }
  .index__what, .index__stack { grid-column: 2; }
  .index__arrow { grid-column: 3; grid-row: 1; }
  .index.is-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .seq ol { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: var(--s-8); }
  .seq__line { display: none; }
  .magnet { grid-column: 1 / -1; }
  .contact__mail { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  .hero__fig span:nth-child(n+2) { display: none; }
  /* Breathes to wdth 118 = 4.59em wide; 19.5vw keeps that inside the 16px margins. */
  .wordmark { font-size: 19.5vw; }
  .wordmark .ln:nth-child(2) { text-align: left; }
  .hero__mark { padding-block: var(--s-8) var(--s-6); }
  .leak-row__n { grid-column: 1 / -1; padding-top: 0; }
  .leak-row__title, .leak-row__col, .leak-row__col--fix, .leak-row__proof { grid-column: 1 / -1; }
  .sheet__body { padding: var(--s-4); }
  .sheet__side { display: flex; }
  .corner--br { display: none; }
  .index.is-grid { grid-template-columns: 1fr; }
  .seq ol { grid-template-columns: 1fr; }
  .index-tools { flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

/* ---------- 19. Cursor visibility & misc ---------- */
html.has-cursor, html.has-cursor a, html.has-cursor button { cursor: none; }
html.has-cursor input { cursor: text; }
main:focus { outline: none; }

/* ==========================================================================
   v3 · Client site additions (see docs/design/PLAN-v3.md)
   ========================================================================== */

/* ---------- Wordmark, set like the footer, framed like the header logo ---------- */
.wordmark {
  font-size: clamp(4.25rem, 11.6vw, 16rem);
  font-weight: 250;
  line-height: .88;
  letter-spacing: -.045em;
  text-transform: none;
}
.wordmark em { font-style: italic; font-weight: 250; color: inherit; }
.wordmark .ln:nth-child(2) { padding-right: .06em; }
.hero__mark { padding-inline: clamp(14px, 1.6vw, 28px); padding-block: var(--s-7) var(--s-5); }
.hero__mark::before, .hero__mark::after {
  content: ""; position: absolute; width: clamp(18px, 2vw, 30px); height: clamp(18px, 2vw, 30px);
  border: 1px solid currentColor; opacity: .55; pointer-events: none;
}
.hero__mark::before { left: 0; top: var(--s-7); border-right: 0; border-bottom: 0; }
.hero__mark::after { right: 0; bottom: var(--s-5); border-left: 0; border-top: 0; }
.hero__mark .dim { left: clamp(14px, 1.6vw, 28px); }
.mark-tag { position: absolute; right: clamp(14px, 1.6vw, 28px); top: var(--s-7); color: var(--chalk-2); }

/* ---------- Hero foot: pitch + benchmark card ---------- */
.hero__foot { align-items: end; row-gap: var(--s-7); }
.hero__pitch { grid-column: 1 / 8; }
.hero__statement { font-size: clamp(1.9rem, 1rem + 2.6vw, 3.6rem); max-width: 18ch; }
.hero__sub { margin-top: var(--s-4); max-width: 46ch; color: var(--chalk-2); font-size: var(--fs-md); line-height: 1.45; }
.hero__ctas { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-3) var(--s-5); margin-top: var(--s-6); }
.hero__risk { display: flex; align-items: center; gap: var(--s-2); margin-top: var(--s-4); color: var(--chalk-2); }
.hero__risk .tick { width: 14px; height: 14px; border: 1px solid var(--redline-hi); border-radius: 50%; position: relative; flex-shrink: 0; }
.hero__risk .tick::after { content: ""; position: absolute; left: 4px; top: 2px; width: 3px; height: 6px; border: solid var(--redline-hi); border-width: 0 1px 1px 0; transform: rotate(45deg); }

.btn-solid { min-height: 52px; }
[data-surface="cyan"] .btn-bracket, [data-surface="cyan-deep"] .btn-bracket { color: var(--chalk); }

.hdr__cta {
  grid-column: 12 / 13; justify-self: end; display: inline-flex; align-items: center; gap: var(--s-2);
  min-height: 36px; padding: 0 var(--s-4); border: var(--hair) solid currentColor; border-radius: var(--r-pill);
  white-space: nowrap; transition: background var(--dur-1), color var(--dur-1), border-color var(--dur-1);
}
.hdr__cta:hover { background: var(--redline); border-color: var(--redline); color: var(--vellum); }

.bench { grid-column: 9 / -1; border: var(--hair) solid var(--cyan-line); background: color-mix(in oklch, var(--cyan-deep) 55%, transparent); padding: var(--s-4) var(--s-5) var(--s-5); }
.bench__top { display: flex; justify-content: space-between; gap: var(--s-3); color: var(--chalk-2); padding-bottom: var(--s-3); border-bottom: var(--hair) solid var(--cyan-line); }
.bench__score { display: flex; align-items: flex-end; gap: var(--s-4); margin-top: var(--s-4); }
.bench__num { font-size: clamp(4rem, 3rem + 3vw, 6.5rem); color: var(--redline-hi); }
.bench__was { color: var(--chalk-2); padding-bottom: .6em; }
.bench__was b { color: var(--chalk); font-weight: 500; }
.bench__scale { position: relative; margin-top: var(--s-5); padding-top: 14px; }
.bench__bands { display: grid; grid-template-columns: 50fr 40fr 10fr; gap: 2px; height: 6px; }
.bench__bands i { display: block; }
.bench__bands i:nth-child(1) { background: color-mix(in oklch, var(--redline-hi) 70%, transparent); }
.bench__bands i:nth-child(2) { background: color-mix(in oklch, var(--chalk-2) 45%, transparent); }
.bench__bands i:nth-child(3) { background: var(--chalk); }
.bench__pin { position: absolute; top: 0; left: calc(var(--at) * 1%); width: 1px; height: 26px; background: currentColor; transform: translateX(-.5px); }
.bench__pin::before { content: ""; position: absolute; top: 0; left: -4px; border: 4.5px solid transparent; border-top: 6px solid currentColor; }
.bench__pin--was { color: var(--chalk-2); }
.bench__pin--now { color: var(--redline-hi); }
.bench__ticks { position: relative; height: 1.6em; margin-top: var(--s-2); color: var(--chalk-2); }
.bench__ticks span { position: absolute; top: 0; left: calc(var(--at, 0) * 1%); transform: translateX(-50%); }
.bench__ticks span:first-child { left: 0; transform: none; }
.bench__rows { margin-top: var(--s-4); border-top: var(--hair) solid var(--cyan-line); }
.bench__rows div { display: flex; justify-content: space-between; align-items: baseline; gap: var(--s-3); padding: var(--s-2) 0; border-bottom: var(--hair) solid var(--cyan-line); }
.bench__rows dt { color: var(--chalk-2); }
.bench__rows dd { font-size: 1.6rem; }
.bench__rows dd small { font-size: .5em; font-weight: 500; color: var(--chalk-2); }

/* ---------- Cost calculator ---------- */
.cost { padding-bottom: var(--s-10); }
.cost .sec-head { border-bottom-color: var(--cyan-line); }
.calc { padding-top: var(--s-8); row-gap: var(--s-8); align-items: start; }
.calc__inputs { grid-column: 1 / 7; display: flex; flex-direction: column; }
.calc__row { display: grid; grid-template-columns: 1fr auto; align-items: baseline; gap: var(--s-2) var(--s-4); padding: var(--s-4) 0; border-bottom: var(--hair) solid var(--cyan-line); }
.calc__row label { color: var(--chalk-2); }
.calc__row output { font-size: clamp(1.6rem, 1.2rem + 1vw, 2.4rem); color: var(--chalk); }
.calc__row input { grid-column: 1 / -1; }
.calc__row--lift output { color: var(--redline-hi); }
input[type="range"] { -webkit-appearance: none; appearance: none; width: 100%; height: 28px; background: transparent; cursor: pointer; }
input[type="range"]::-webkit-slider-runnable-track { height: 1px; background: currentColor; opacity: 1; }
input[type="range"]::-moz-range-track { height: 1px; background: currentColor; }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 18px; height: 18px; margin-top: -9px; border-radius: 50%; background: var(--redline-hi); border: 3px solid var(--cyan); box-shadow: 0 0 0 1px var(--redline-hi); }
input[type="range"]::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: var(--redline-hi); border: 3px solid var(--cyan); }
.calc__row input { color: var(--chalk-2); }
.calc__out { grid-column: 8 / -1; position: sticky; top: calc(var(--hdr-h) + var(--s-5)); border: var(--hair) solid var(--cyan-line); padding: var(--s-6); background: var(--cyan-deep); }
.calc__big { font-size: clamp(3.4rem, 2rem + 4.4vw, 6.75rem); color: var(--redline-hi); margin: var(--s-2) 0 var(--s-5); white-space: nowrap; }
.calc__rows { border-top: var(--hair) solid var(--cyan-line); }
.calc__rows div { display: flex; justify-content: space-between; align-items: baseline; padding: var(--s-3) 0; border-bottom: var(--hair) solid var(--cyan-line); }
.calc__rows dt { color: var(--chalk-2); }
.calc__rows dd { font-size: 1.8rem; }
.calc__payback { margin: var(--s-5) 0; font-size: var(--fs-md); line-height: 1.4; }
.calc__payback b { font-size: 1.4em; color: var(--redline-hi); }
.calc__note { margin-top: var(--s-4); color: var(--chalk-2); }

/* ---------- Offer ladder ---------- */
.ladder-sec { padding-bottom: var(--s-10); }
.rungs { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--gutter); padding-top: var(--s-8); align-items: stretch; }
.rung { position: relative; display: flex; flex-direction: column; gap: var(--s-4); padding: var(--s-5); border: var(--hair) solid var(--graphite); background: var(--vellum); }
.rung__head { display: flex; flex-direction: column; gap: var(--s-1); padding-bottom: var(--s-3); border-bottom: var(--hair) solid currentColor; }
.rung__n { color: var(--redline-ink); }
.rung__name { font-size: clamp(1.7rem, 1.2rem + 1.2vw, 2.6rem); }
.rung__price { font-size: clamp(3rem, 2rem + 2.6vw, 4.75rem); }
.rung__price small { font-family: var(--mono); font-size: var(--fs-micro); font-weight: 400; letter-spacing: .08em; text-transform: uppercase; vertical-align: super; }
.rung__for { font-size: var(--fs-md); line-height: 1.35; }
.rung__list { display: flex; flex-direction: column; border-top: var(--hair) solid var(--rule); flex: 1; }
.rung__list li { position: relative; padding: var(--s-2) 0 var(--s-2) var(--s-5); border-bottom: var(--hair) solid var(--rule); font-size: var(--fs-sm); }
.rung__list li::before { content: "+"; position: absolute; left: 0; top: var(--s-2); font-family: var(--mono); color: var(--redline-ink); }
.rung .btn-bracket, .rung .btn-solid { align-self: flex-start; }
.rung--hero { border-color: var(--cyan); transform: translateY(calc(var(--s-5) * -1)); box-shadow: 0 0 0 1px var(--cyan); }
.rung--hero .rung__list { border-top-color: var(--cyan-line); }
.rung--hero .rung__list li { border-bottom-color: var(--cyan-line); }
.rung--hero .rung__n, .rung--hero .rung__list li::before { color: var(--redline-hi); }
.rung--hero .rung__price { color: var(--redline-hi); }
.rung__flag { position: absolute; top: -1px; right: -1px; padding: 4px 9px; background: var(--redline); color: var(--vellum); }
.rung__guarantee { padding: var(--s-3); border: 1px dashed var(--redline-hi); color: var(--chalk); }
.rungs__note { margin-top: var(--s-5); color: var(--graphite-2); }

.guarantee { margin-top: var(--s-9); display: grid; grid-template-columns: auto 1fr; gap: var(--s-7); align-items: center; padding: var(--s-7); border: 2px solid var(--graphite); position: relative; }
.guarantee::before { content: ""; position: absolute; inset: 6px; border: var(--hair) solid var(--rule); pointer-events: none; }
.guarantee__stamp { width: clamp(150px, 15vw, 210px); aspect-ratio: 1; border-radius: 50%; border: 2px solid var(--redline); color: var(--redline-ink); display: grid; place-content: center; text-align: center; gap: var(--s-1); transform: rotate(-12deg); position: relative; }
.guarantee__stamp::before { content: ""; position: absolute; inset: 8px; border-radius: 50%; border: 1px solid var(--redline); }
.guarantee__stamp span { font-family: var(--mono); font-size: clamp(.8rem, .6rem + .5vw, 1.05rem); letter-spacing: .14em; text-transform: uppercase; font-weight: 600; }
.guarantee__stamp small { font-family: var(--mono); font-size: 10px; letter-spacing: .1em; text-transform: uppercase; }
.guarantee__title { font-size: clamp(1.8rem, 1.2rem + 1.8vw, 3.2rem); margin: var(--s-3) 0 var(--s-5); }
.guarantee__cols { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-6); }
.guarantee__cols p { font-size: var(--fs-sm); color: var(--graphite-2); }
.guarantee__cols b { color: var(--graphite); font-weight: 600; }

/* ---------- Compare slider (EN / AR) ---------- */
.compare { position: relative; }
.compare__stage { position: relative; display: block; }
.compare__stage > img { position: absolute; inset: 0; }
.compare__top { position: absolute; inset: 0; clip-path: inset(0 0 0 var(--cut, 50%)); }
.compare__top img { width: 100%; height: 100%; object-fit: cover; object-position: top; }
.compare__handle { position: absolute; top: 0; bottom: 0; left: var(--cut, 50%); width: 0; pointer-events: none; }
.compare__handle i { position: absolute; top: 0; bottom: 0; left: -1px; width: 2px; background: var(--redline); }
.compare__handle b { position: absolute; top: 50%; left: 0; transform: translate(-50%, -50%); padding: 6px 10px; background: var(--redline); color: var(--vellum); font-weight: 400; font-size: 10px; letter-spacing: .08em; white-space: nowrap; }
.compare__range { position: absolute; left: 0; right: 0; bottom: 0; top: 30px; width: 100%; height: calc(100% - 30px); opacity: 0; cursor: ew-resize; margin: 0; }
.compare__range:focus-visible + * , .compare:focus-within .compare__handle b { outline: 2px solid var(--redline); outline-offset: 2px; }

/* ---------- FAQ ---------- */
.faq { margin-top: var(--s-5); margin-bottom: var(--s-10); }
.faq__item { border-bottom: var(--hair) solid var(--rule); }
.faq__item summary { display: grid; grid-template-columns: 4rem 1fr 28px; gap: var(--gutter); align-items: center; padding: var(--s-5) 0; cursor: pointer; list-style: none; }
.faq__item summary::-webkit-details-marker { display: none; }
.faq__n { color: var(--redline-ink); }
.faq__q { font-size: clamp(1.25rem, 1rem + .9vw, 2rem); transition: color var(--dur-1); }
.faq__item summary:hover .faq__q { color: var(--redline-ink); }
.faq__x { position: relative; width: 28px; height: 28px; border: var(--hair) solid var(--graphite); border-radius: 50%; }
.faq__x::before, .faq__x::after { content: ""; position: absolute; left: 50%; top: 50%; width: 11px; height: 1px; background: currentColor; transform: translate(-50%, -50%); transition: transform var(--dur-2) var(--ease-out); }
.faq__x::after { transform: translate(-50%, -50%) rotate(90deg); }
.faq__item[open] .faq__x::after { transform: translate(-50%, -50%) rotate(0deg); }
.faq__item[open] .faq__x { background: var(--graphite); color: var(--vellum); }
.faq__a { padding: 0 0 var(--s-6) calc(4rem + var(--gutter)); max-width: calc(64ch + 4rem); }
.faq__a p { color: var(--graphite-2); font-size: var(--fs-md); line-height: 1.5; }
.faq__item[open] .faq__a { animation: faqIn var(--dur-2) var(--ease-out); }
@keyframes faqIn { from { opacity: 0; transform: translateY(-6px); } }

/* ---------- Large-name footer (outline that fills on hover) ---------- */
.bigname { position: relative; display: block; margin-top: var(--s-9); font-size: clamp(3.5rem, 15.4vw, 19.5rem); font-weight: 250; line-height: .86; letter-spacing: -.045em; white-space: nowrap; overflow: hidden; padding-bottom: .06em; }
.bigname span { display: block; }
.bigname__out { color: transparent; -webkit-text-stroke: 1px color-mix(in oklch, var(--chalk) 55%, transparent); }
.bigname__in { position: absolute; inset: 0; color: var(--chalk); clip-path: inset(0 100% 0 0); transition: clip-path 1.1s var(--ease-out); }
.bigname:hover .bigname__in, .bigname:focus-visible .bigname__in { clip-path: inset(0 0 0 0); }
.colophon a[href="dev/"] { color: var(--chalk); border-bottom: 1px solid var(--redline-hi); }

/* ---------- v3 responsive ---------- */
@media (max-width: 1100px) {
  .hero__pitch, .bench { grid-column: 1 / -1; }
  .bench { max-width: 560px; }
  .calc__inputs, .calc__out { grid-column: 1 / -1; }
  .calc__out { position: static; }
  .rungs { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: var(--s-7); }
  .rung--hero { transform: none; }
}
@media (max-width: 900px) {
  .hdr__cta { grid-column: 8 / -1; }
}
@media (max-width: 640px) {
  /* Measured: light weight at wdth 118 is ~3.5em wide; 24vw keeps the breathing name inside the margins. */
  .wordmark { font-size: 24vw; }
  .mark-tag { display: none; }
  .rungs { grid-template-columns: 1fr; }
  .guarantee { grid-template-columns: 1fr; padding: var(--s-5); justify-items: start; }
  .guarantee__cols { grid-template-columns: 1fr; gap: var(--s-4); }
  .faq__item summary { grid-template-columns: 1fr 28px; }
  .faq__n { display: none; }
  .faq__a { padding-left: 0; }
  .calc__out { padding: var(--s-5); }
  .bigname { font-size: 15vw; }
}
.rung.rung--hero { background: var(--cyan); color: var(--chalk); }
.rung--hero .rung__for { color: var(--chalk); }
.rung--hero .rung__list li { color: var(--chalk-2); }

/* ==========================================================================
   v3 · Developer site (/dev/) — ink-first variant of the same system
   ========================================================================== */
body.dev { background: var(--graphite); color: var(--vellum); }
.hdr__sub { margin-left: 6px; font-size: 10px; letter-spacing: .08em; opacity: .7; font-weight: 400; }
[data-surface="ink"] .hero__grid span { border-color: var(--ink-rule); }
[data-surface="ink"] .hero__fig, [data-surface="ink"] .mark-tag, [data-surface="ink"] .hero__sub { color: var(--on-ink-2); }
[data-surface="ink"] .btn-bracket { color: var(--vellum); }
[data-surface="ink"] .btn-solid { background: var(--vellum); color: var(--graphite); }
[data-surface="ink"] .btn-solid:hover { background: var(--redline-hi); }
[data-surface="ink"] .sec-head__meta .n { color: var(--redline-hi); }
[data-surface="ink"] .h-sec em, [data-surface="ink"] .statement em { color: var(--redline-hi); }
[data-surface="ink"] .tags li { border-color: var(--ink-rule); color: var(--on-ink-2); }
[data-surface="ink"] code { font-family: var(--mono); font-size: .85em; }

/* Status block (21st: system-status-block) */
.status { grid-column: 9 / -1; border: var(--hair) solid var(--ink-rule); background: oklch(0.19 0.012 255); }
.status__top { display: flex; justify-content: space-between; align-items: center; padding: var(--s-3) var(--s-4); border-bottom: var(--hair) solid var(--ink-rule); color: var(--on-ink-2); }
.status__top span:first-child { display: inline-flex; align-items: center; gap: var(--s-2); }
.status__dot { width: 7px; height: 7px; border-radius: 50%; background: oklch(0.72 0.15 150); animation: pulse 2.4s infinite; }
.status__rows div { display: grid; grid-template-columns: 10.5em 1fr; gap: var(--s-3); padding: var(--s-2) var(--s-4); border-bottom: var(--hair) solid var(--ink-rule); }
.status__rows div:last-child { border-bottom: 0; }
.status__rows dt { color: var(--on-ink-2); }
.status__rows dd { color: var(--vellum); }
.status__rows b { color: oklch(0.78 0.14 150); font-weight: 500; }

/* TL;DR table */
.tldr { margin-top: var(--s-7); border-top: var(--hair) solid var(--ink-rule); }
.tldr div { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 9fr); gap: var(--gutter); padding: var(--s-5) 0; border-bottom: var(--hair) solid var(--ink-rule); align-items: baseline; }
.tldr dt { color: var(--redline-hi); }
.tldr dd { font-size: var(--fs-md); line-height: 1.45; display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-3) var(--s-5); }
.tldr__mail { border-bottom: 1px solid var(--redline-hi); }

/* System sheets */
.sys { margin-top: var(--s-8); border: var(--hair) solid var(--ink-rule); }
.sys + .sys { margin-top: var(--s-7); }
.sys__head { display: grid; grid-template-columns: auto 1fr auto; grid-template-areas: "n title link" "n sub link"; column-gap: var(--s-5); align-items: baseline; padding: var(--s-5); border-bottom: var(--hair) solid var(--ink-rule); }
.sys__n { grid-area: n; color: var(--redline-hi); }
.sys__title { grid-area: title; font-size: clamp(1.8rem, 1.2rem + 1.8vw, 3.2rem); }
.sys__sub { grid-area: sub; color: var(--on-ink-2); font-size: var(--fs-sm); margin-top: var(--s-1); }
.sys__link { grid-area: link; align-self: center; color: var(--on-ink-2); transition: color var(--dur-1); }
.sys__link:hover { color: var(--redline-hi); }
.sys__body { padding: var(--s-5); row-gap: var(--s-6); }
.sys__text { grid-column: 1 / 6; display: flex; flex-direction: column; gap: var(--s-3); }
.sys__text .label { margin-top: var(--s-3); color: var(--on-ink-2); }
.sys__text .label:first-child { margin-top: 0; }
.sys__text p { color: var(--on-ink-2); font-size: var(--fs-sm); }
.sys__list li { position: relative; padding: var(--s-2) 0 var(--s-2) var(--s-5); border-bottom: var(--hair) solid var(--ink-rule); font-size: var(--fs-sm); }
.sys__list li::before { content: "+"; position: absolute; left: 0; font-family: var(--mono); color: var(--redline-hi); }
.sys__text .tags { margin-top: var(--s-3); }
.sys__vis { grid-column: 6 / -1; display: flex; flex-direction: column; gap: var(--s-4); min-width: 0; }
.sys__metric { display: flex; align-items: center; gap: var(--s-3); margin-top: var(--s-4); }
.sys__metric .numeral { font-size: clamp(2.6rem, 2rem + 2vw, 4rem); }
.sys__metric .from { color: var(--on-ink-2); }
.sys__metric .hi { color: var(--redline-hi); }
.sys__metric .arrow { width: 64px; height: 1px; background: var(--redline-hi); position: relative; }
.sys__metric .arrow::after { content: ""; position: absolute; right: 0; top: -4px; border: 4px solid transparent; border-left: 7px solid var(--redline-hi); border-right: 0; }
.sys__metric .mono { color: var(--on-ink-2); }

/* Architecture diagram */
.arch svg { width: 100%; height: auto; display: block; }
.arch__box rect { fill: oklch(0.19 0.012 255); stroke: var(--on-ink-2); stroke-width: 1; }
.arch__box--core rect { stroke: var(--vellum); stroke-width: 1.5; }
.arch__box--hot rect { stroke: var(--redline-hi); }
.arch__box text { font-family: var(--mono); font-size: 11px; letter-spacing: .06em; fill: var(--vellum); }
.arch__box text.t2 { fill: var(--on-ink-2); font-size: 10px; letter-spacing: .02em; }
.arch__wires path { fill: none; stroke: var(--on-ink-2); stroke-width: 1; }
.arch__wires .arch__hot { stroke: var(--redline-hi); stroke-width: 1.5; }
.arch__note { font-family: var(--mono); font-size: 10px; fill: var(--redline-hi); letter-spacing: .04em; }
.arch figcaption, .wf figcaption { margin-top: var(--s-2); color: var(--on-ink-2); }

/* Code panels + tabs (21st: package-installer-tabs, tree-code-viewer) */
.code { border: var(--hair) solid var(--ink-rule); background: oklch(0.175 0.012 255); min-width: 0; }
.code__tabs { display: flex; flex-wrap: wrap; border-bottom: var(--hair) solid var(--ink-rule); }
.code__tabs [role="tab"] { min-height: 40px; padding: 0 var(--s-4); font-family: var(--mono); font-size: 11px; letter-spacing: .04em; color: var(--on-ink-2); border-right: var(--hair) solid var(--ink-rule); }
.code__tabs [role="tab"][aria-selected="true"] { color: var(--vellum); background: oklch(0.21 0.013 255); box-shadow: inset 0 -2px 0 var(--redline-hi); }
.code__panel { margin: 0; padding: var(--s-4) var(--s-5); overflow-x: auto; font-family: var(--mono); font-size: 12px; line-height: 1.7; color: var(--vellum); tab-size: 4; white-space: pre; }
.code__panel:focus-visible { outline-offset: -2px; }
.code__panel .c { color: var(--on-ink-2); font-style: italic; }
.code__panel .k { color: var(--redline-hi); }
.code__panel .s { color: oklch(0.82 0.06 150); }
.code__panel .f { color: var(--chalk-2); }
.code__panel .n { color: oklch(0.84 0.09 80); }

/* Waterfall sketch */
.wf { border: var(--hair) solid var(--ink-rule); padding: var(--s-3) var(--s-4) var(--s-4); }
.wf__row { display: grid; grid-template-columns: 7.5em 1fr 1fr; gap: var(--s-3); align-items: center; min-height: 26px; }
.wf__row > span:first-child { color: var(--on-ink-2); font-size: 11px; }
.wf__row--head { color: var(--on-ink-2); border-bottom: var(--hair) solid var(--ink-rule); padding-bottom: var(--s-2); margin-bottom: var(--s-2); }
.wf__bar { position: relative; height: 8px; }
.wf__bar::after { content: ""; position: absolute; top: 0; height: 100%; left: calc(var(--s) * 1%); width: calc(var(--w) * 1%); background: var(--on-ink-2); }
.wf__bar--block::after { background: color-mix(in oklch, var(--redline-hi) 55%, var(--graphite)); }
.wf__bar--lcp::after { background: var(--redline-hi); }
.wf__gone { color: oklch(0.78 0.14 150); font-size: 10px; letter-spacing: .06em; }

/* Routing table */
.route { border: var(--hair) solid var(--ink-rule); }
.route__row { display: grid; grid-template-columns: 1fr 1.6fr; padding: var(--s-2) var(--s-4); border-bottom: var(--hair) solid var(--ink-rule); font-size: 11px; }
.route__row:last-child { border-bottom: 0; }
.route__row--head { color: var(--on-ink-2); }
.route__row--fb { color: var(--redline-hi); }

/* Chevron stages */
.chev { display: grid; grid-template-columns: repeat(5, 1fr); gap: 3px; }
.chev span { display: grid; place-items: center; min-height: 54px; padding: 0 16px; background: oklch(0.24 0.012 255); color: var(--on-ink-2); font-family: var(--mono); font-size: 10px; letter-spacing: .04em; text-align: center; clip-path: polygon(0 0, 88% 0, 100% 50%, 88% 100%, 0 100%, 12% 50%); }
.chev span:first-child { clip-path: polygon(0 0, 88% 0, 100% 50%, 88% 100%, 0 100%); }
.chev .on { background: var(--redline-hi); color: var(--graphite); }

/* File tree */
#code { padding-bottom: var(--s-10); }
#code .sec-head { border-bottom-color: var(--cyan-line); }
.tree { display: grid; grid-template-columns: minmax(220px, 3fr) minmax(0, 9fr); margin-top: var(--s-7); border: var(--hair) solid var(--cyan-line); background: var(--cyan-deep); }
.tree__files { display: flex; flex-direction: column; padding: var(--s-4); border-right: var(--hair) solid var(--cyan-line); }
.tree__dir { color: var(--chalk-2); padding: var(--s-2) 0; font-size: 12px; }
.tree__file { text-align: left; min-height: 36px; padding: 0 var(--s-2); font-size: 12px; color: var(--chalk); display: flex; align-items: center; gap: var(--s-2); }
.tree__file i, .tree__dir i { font-style: normal; color: var(--cyan-line); white-space: pre; }
.tree__file[aria-selected="true"] { background: var(--redline-hi); color: var(--cyan-deep); }
.tree__file[aria-selected="true"] i { color: var(--cyan-deep); }
.tree__panels { min-width: 0; }
.tree__panels .code__panel { color: var(--chalk); font-size: 13px; padding: var(--s-6); }
.tree__panels .code__panel .c { color: var(--chalk-2); }
.tree__panels .code__panel .k { color: var(--redline-hi); }
.tree__panels .code__panel .f { color: oklch(0.88 0.05 230); }

/* Stack partition bar (21st: partition-bar) */
.pbar { display: flex; gap: 4px; height: 10px; margin-top: var(--s-7); }
.pbar i { flex: var(--n) 1 0; background: var(--on-ink-2); }
.pbar i:first-child { background: var(--redline-hi); }
.pbar i:last-child { background: var(--ink-rule); }
.stackcols { display: grid; grid-template-columns: 8fr 7fr 3fr; gap: 4px; margin-top: var(--s-4); padding-bottom: var(--s-9); }
.stackcol .label b { color: var(--redline-hi); font-weight: 400; }
.stackcol ul { margin-top: var(--s-3); border-top: var(--hair) solid var(--ink-rule); }
.stackcol li { padding: var(--s-2) 0; border-bottom: var(--hair) solid var(--ink-rule); font-size: var(--fs-sm); }

.index--dev .index__link { grid-template-columns: 3rem minmax(0, 4fr) minmax(0, 5fr) minmax(0, 3fr) 2rem; }

/* Colophon spec */
.spec { margin-top: var(--s-6); padding-bottom: var(--s-9); }
.spec li { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 9fr); gap: var(--gutter); padding: var(--s-4) 0; border-bottom: var(--hair) solid var(--ink-rule); }
.spec .mono { color: var(--redline-hi); font-size: var(--fs-micro); letter-spacing: .08em; text-transform: uppercase; padding-top: .3em; }
.spec p { font-size: var(--fs-md); color: var(--on-ink-2); }
.spec code { color: var(--vellum); }

/* Contact table (Matt Jinn pattern) */
.contact__table { grid-column: 4 / -1; border-top: var(--hair) solid var(--cyan-line); }
.contact__table div { display: grid; grid-template-columns: 9em 1fr; gap: var(--s-4); padding: var(--s-3) 0; border-bottom: var(--hair) solid var(--cyan-line); align-items: center; }
.contact__table dt { color: var(--chalk-2); }
.contact__table dd { color: var(--chalk); display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-2) var(--s-4); text-transform: none; letter-spacing: .02em; }
.contact__table a { border-bottom: 1px solid var(--redline-hi); }
.contact__table .btn-bracket { padding: var(--s-2) var(--s-4); min-height: 36px; border: 0; }

@media (max-width: 1100px) {
  .status { grid-column: 1 / -1; max-width: 560px; }
  .sys__text, .sys__vis { grid-column: 1 / -1; }
  .contact__table { grid-column: 1 / -1; }
}
@media (max-width: 760px) {
  .tree { grid-template-columns: 1fr; }
  .tree__files { border-right: 0; border-bottom: var(--hair) solid var(--cyan-line); }
  .tldr div, .spec li { grid-template-columns: 1fr; gap: var(--s-2); }
  .stackcols { grid-template-columns: 1fr; gap: var(--s-5); }
  .sys__head { grid-template-columns: 1fr; grid-template-areas: "n" "title" "sub" "link"; row-gap: var(--s-1); }
  .chev span { font-size: 9px; padding: 0 10px; min-height: 46px; }
  .index--dev .index__link { grid-template-columns: 2.25rem minmax(0, 1fr) 1.5rem; }
}
.tree__file, .tree__dir, .route__row { text-transform: none; letter-spacing: .02em; }
[data-surface="cyan-deep"] .statement em, [data-surface="ink"] .statement em { color: var(--redline-hi); }
@media (max-width: 760px) {
  .arch { overflow-x: auto; }
  .arch svg { min-width: 560px; }
}

/* ==========================================================================
   v3.1 · Case files: Problem → Why it mattered → Method → Outcome → Why this way
   ========================================================================== */
.cf-pair { display: flex; flex-direction: column; gap: var(--s-3); }
.cf-pair div { border-top: var(--hair) solid var(--rule); padding-top: var(--s-2); }
.cf-pair dt { margin-bottom: var(--s-1); }
.cf-pair dd { font-size: var(--fs-sm); line-height: 1.45; }
.cf-pair div:first-child dt { color: var(--redline-ink); }

.metric__k { color: var(--redline-ink); margin-bottom: var(--s-1); }
.metric__p { margin-top: var(--s-2); font-size: var(--fs-sm); line-height: 1.45; }

/* Method stepper (21st: how-it-works / steppers), drawn as a dimensioned sequence */
.method { display: grid; grid-auto-flow: column; grid-auto-columns: minmax(0, 1fr); gap: var(--gutter); counter-reset: m; }
.method li { position: relative; display: flex; flex-direction: column; gap: var(--s-1); padding-top: var(--s-5); }
.method li::before { content: ""; position: absolute; left: 0; right: calc(var(--gutter) * -1); top: 8px; height: 1px; background: currentColor; opacity: .35; }
.method li:last-child::before { right: 0; }
.method li::after { content: ""; position: absolute; left: 0; top: 4px; width: 9px; height: 9px; border-radius: 50%; background: var(--redline); }
.method__n { color: var(--redline-ink); }
.method__t { font-weight: 600; font-size: var(--fs-sm); }
.method__d { font-size: var(--fs-sm); line-height: 1.45; color: var(--graphite-2); }

.cf-why { border-left: 2px solid var(--redline); padding: var(--s-1) 0 var(--s-1) var(--s-4); }
.cf-why .label { color: var(--redline-ink); }
.cf-why p { margin-top: var(--s-1); font-size: var(--fs-sm); line-height: 1.45; font-style: italic; }

/* Inside a client drawing sheet */
.sheet__side { gap: var(--s-4); }
.sheet__side .metric { margin-top: auto; }
.cf-row { grid-column: 1 / -1; display: grid; grid-template-columns: minmax(0, 1fr) minmax(220px, 27%); gap: var(--s-6); align-items: start; padding-top: var(--s-4); border-top: var(--hair) solid var(--graphite); }
.cf-row__m > .label { display: block; margin-bottom: var(--s-1); }

/* Expandable case file inside index rows (ink surface) */
.casefile { border-top: 1px dashed var(--ink-rule); margin-left: calc(3rem + var(--gutter)); }
.casefile summary { display: inline-flex; align-items: center; gap: var(--s-3); min-height: 44px; cursor: pointer; list-style: none; color: var(--on-ink-2); transition: color var(--dur-1); }
.casefile summary::-webkit-details-marker { display: none; }
.casefile summary:hover { color: var(--redline-hi); }
.casefile__x { position: relative; width: 18px; height: 18px; border: var(--hair) solid currentColor; border-radius: 50%; }
.casefile__x::before, .casefile__x::after { content: ""; position: absolute; left: 50%; top: 50%; width: 8px; height: 1px; background: currentColor; transform: translate(-50%, -50%); transition: transform var(--dur-2) var(--ease-out); }
.casefile__x::after { transform: translate(-50%, -50%) rotate(90deg); }
.casefile[open] .casefile__x::after { transform: translate(-50%, -50%) rotate(0deg); }
.casefile__body { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 5fr) minmax(0, 3fr); gap: var(--s-6); padding: var(--s-3) 0 var(--s-7); }
.casefile[open] .casefile__body { animation: faqIn var(--dur-2) var(--ease-out); }
.casefile__method .label { display: block; margin-bottom: var(--s-1); }
.casefile__method .method { grid-auto-flow: row; grid-auto-columns: auto; gap: var(--s-3); }
.casefile__end { display: flex; flex-direction: column; gap: var(--s-5); }
.index.is-grid .casefile { margin-left: 0; }
.index.is-grid .casefile__body { grid-template-columns: 1fr; }

/* Vertical method (dev sys column, index case files) */
.casefile__method .method li, .sys__method .method li { padding-top: 0; padding-left: var(--s-6); }
.casefile__method .method li::before, .sys__method .method li::before { left: 4px; right: auto; top: 14px; bottom: calc(var(--s-3) * -1); width: 1px; height: auto; }
.casefile__method .method li:last-child::before, .sys__method .method li:last-child::before { display: none; }
.casefile__method .method li::after, .sys__method .method li::after { top: 6px; }
.sys__method .method { grid-auto-flow: row; grid-auto-columns: auto; gap: var(--s-3); margin-top: var(--s-1); }
.sys__text .metric { border-top: 2px solid currentColor; padding-top: var(--s-3); margin-top: var(--s-3); }
.sys__text .cf-why { margin-top: var(--s-3); }

/* Ink surface colours for the shared pieces */
[data-surface="ink"] .cf-pair div { border-top-color: var(--ink-rule); }
[data-surface="ink"] .cf-pair div:first-child dt, [data-surface="ink"] .metric__k, [data-surface="ink"] .method__n, [data-surface="ink"] .cf-why .label { color: var(--redline-hi); }
[data-surface="ink"] .cf-pair dd, [data-surface="ink"] .metric__p, [data-surface="ink"] .method__d { color: var(--on-ink-2); }
[data-surface="ink"] .method__t, [data-surface="ink"] .cf-why p { color: var(--vellum); }
[data-surface="ink"] .method li::after { background: var(--redline-hi); }
[data-surface="ink"] .cf-why { border-left-color: var(--redline-hi); }
[data-surface="ink"] .metric { border-top: 2px solid var(--vellum); padding-top: var(--s-3); }
[data-surface="ink"] .metric__v { display: flex; align-items: baseline; gap: var(--s-3); font-size: clamp(2.4rem, 1.8rem + 2vw, 3.8rem); }
[data-surface="ink"] .metric__v .from { color: var(--on-ink-2); }
[data-surface="ink"] .metric__v .hi { color: var(--redline-hi); }
[data-surface="ink"] .metric__v .arrow { background: var(--redline-hi); }
[data-surface="ink"] .metric__v .arrow::after { border-left-color: var(--redline-hi); }

.hero__gh { display: inline-flex; align-items: center; min-height: 44px; color: var(--on-ink-2); border-bottom: 1px solid var(--ink-rule); transition: color var(--dur-1), border-color var(--dur-1); }
.hero__gh:hover { color: var(--redline-hi); border-color: var(--redline-hi); }
.status__rows a { border-bottom: 1px solid var(--redline-hi); text-transform: none; }

@media (max-width: 1100px) {
  .cf-row { grid-template-columns: 1fr; }
  .casefile__body { grid-template-columns: 1fr 1fr; }
  .casefile__end { grid-column: 1 / -1; }
}
@media (max-width: 760px) {
  .method { grid-auto-flow: row; grid-auto-columns: auto; }
  .method li { padding-top: 0; padding-left: var(--s-6); }
  .method li::before { left: 4px; right: auto; top: 14px; bottom: calc(var(--gutter) * -1); width: 1px; height: auto; }
  .method li:last-child::before { display: none; }
  .method li::after { top: 6px; }
  .casefile { margin-left: 0; }
  .casefile__body { grid-template-columns: 1fr; }
}
.wf__row > span:first-child { text-transform: none; letter-spacing: .02em; }