/* ==========================================================================
   Ferra.rs — homage to rust-lang.org's bold-block, slab-wordmark playbook
   ========================================================================== */

:root {
  /* Ink + paper */
  --ink:        #15100c;
  --ink-soft:   #2b231d;
  --ink-mute:   #5a4f45;
  --paper:      #ffffff;
  --cream:      #f4ede0;
  --cream-deep: #e8dec9;
  --rule:       #d9d2c2;
  --rule-soft:  #ece6d8;

  /* Block colors */
  --teal:       #0e7466;
  --teal-deep:  #0a5b50;
  --plum:       #3a1652;
  --plum-deep:  #2a0e3d;
  --iron:       #1a2230;
  --iron-deep:  #11161f;

  /* Accent */
  --amber:      #f6c016;
  --amber-deep: #d9a608;
  --ember:      #c8410b;
  --ember-deep: #9c3208;
  --steel:      #4d6a8a;

  /* Type */
  --sans: "Fira Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Source Code Pro", ui-monospace, SFMono-Regular, Menlo, monospace;
  --slab: "Roboto Slab", var(--sans);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 82px; /* sticky nav height */
}

html, body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }

/* Skip link for keyboard / screen-reader users */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: var(--ember);
  color: #fff;
  padding: 8px 20px;
  font-weight: 700;
  font-size: 14px;
  z-index: 10000;
  text-decoration: none;
  border-radius: 0 0 4px 0;
}
.skip-link:focus { top: 0; }

/* ==========================================================================
   Layout
   ========================================================================== */

.bleed { width: 100%; }
.wrap  { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 48px; }

.bleed--teal   { background: var(--teal);   color: #fff; }
.bleed--plum   { background: var(--plum);   color: #fff; }
.bleed--iron   { background: var(--iron);   color: #fff; }
.bleed--cream  { background: var(--cream);  color: var(--ink); }
.bleed--ink    { background: var(--ink);    color: #fff; }
.bleed--white  { background: #fff;          color: var(--ink); }

/* ==========================================================================
   Type
   ========================================================================== */

.wordmark {
  font-family: var(--slab);
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 0.9;
}

.h-display { font: 900 88px/0.95 var(--sans); letter-spacing: -0.025em; }
.h-1       { font: 800 56px/1.05 var(--sans); letter-spacing: -0.02em; }
.h-2       { font: 800 36px/1.1  var(--sans); letter-spacing: -0.01em; }
.h-3       { font: 700 22px/1.25 var(--sans); letter-spacing: -0.005em; }
.eyebrow   { font: 600 13px/1 var(--sans); text-transform: uppercase; letter-spacing: 0.14em; }

.lede  { font: 400 22px/1.5 var(--sans);  color: var(--ink-soft); }
.body  { font: 400 16px/1.55 var(--sans); }
.small { font: 400 14px/1.5 var(--sans);  color: var(--ink-mute); }

.code, code, pre { font-family: var(--mono); }

.bleed--teal .lede,
.bleed--plum .lede,
.bleed--iron .lede,
.bleed--ink  .lede  { color: rgba(255,255,255,0.78); }

.bleed--teal .small,
.bleed--plum .small,
.bleed--iron .small,
.bleed--ink  .small { color: rgba(255,255,255,0.65); }

/* rust-lang.org underline trick */
.h-underline {
  display: inline-block;
  padding-bottom: 4px;
  border-bottom: 4px solid var(--ember);
}
.bleed--teal  .h-underline { border-bottom-color: #f7d046; }
.bleed--plum  .h-underline { border-bottom-color: #e2545b; }
.bleed--iron  .h-underline { border-bottom-color: var(--amber); }
.bleed--cream .h-underline { border-bottom-color: var(--ember); }

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 22px;
  font: 700 14px/1 var(--sans);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: 0; cursor: pointer; white-space: nowrap;
  transition: transform .12s ease, background .12s ease;
}
.btn:hover { transform: translateY(-1px); }

.btn--amber { background: var(--amber); color: var(--ink); }
.btn--amber:hover { background: var(--amber-deep); }
.btn--ink   { background: var(--ink); color: #fff; }
.btn--ember { background: var(--ember); color: #fff; }
.btn--ghost {
  background: transparent; color: inherit;
  box-shadow: inset 0 0 0 2px currentColor;
}
.btn--ghost:hover { background: currentColor; color: var(--ink); }

.btn .arrow { font-family: var(--mono); font-weight: 600; }

.version-link {
  font: 500 16px/1 var(--sans);
  color: #2b6ec2;
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ==========================================================================
   Top nav
   ========================================================================== */

header {
  position: sticky; top: 0; z-index: 100;
  background: var(--paper);
  border-bottom: 1px solid var(--rule-soft);
}

.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px 48px;
}
.nav__brand {
  display: flex; align-items: baseline; gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
  color: inherit;
}
.nav__brand .mark {
  font-family: var(--slab);
  font-weight: 900;
  font-size: 28px;
  letter-spacing: -0.01em;
}
.nav__brand .dot { color: var(--ember); }
.nav__brand .ver {
  font: 500 12px/1 var(--mono);
  color: var(--ink-mute);
  letter-spacing: 0.04em;
}
.nav__links {
  display: flex; align-items: center; gap: 36px;
  font: 500 15px/1 var(--sans);
}
.nav__links a { color: var(--ink-soft); transition: color .15s ease; }
.nav__links a:hover,
.nav__links a.nav--active { color: var(--ember); font-weight: 700; }
.nav__links .pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 14px;
  border: 2px solid var(--ink); border-radius: 999px;
  font: 700 13px/1 var(--sans);
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  margin-left: auto;
}
.nav__hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--ink);
  transition: transform .2s ease, opacity .2s ease;
  border-radius: 1px;
}
.nav--open .nav__hamburger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav--open .nav__hamburger span:nth-child(2) { opacity: 0; }
.nav--open .nav__hamburger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================================
   Hero A — Faithful
   ========================================================================== */

.hero { padding: 96px 0 120px; }

.heroA__grid {
  display: grid; grid-template-columns: 1.15fr 1fr; gap: 80px;
  align-items: end;
}
.heroA__mark {
  font-family: var(--slab);
  font-weight: 900;
  font-size: 168px;
  line-height: 0.86;
  letter-spacing: -0.03em;
  margin: 0 0 28px;
}
.heroA__mark .dot { color: var(--ember); }
.heroA__tag {
  font: 400 30px/1.25 var(--sans);
  color: var(--ink-soft);
  letter-spacing: -0.01em;
  text-wrap: pretty;
  max-width: 540px;
  margin: 0 0 32px;
}
.heroA__cta { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }

/* Hero meta strip */
.herometa {
  display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
  margin-top: 40px;
  font: 500 14px/1 var(--sans);
  color: var(--ink-mute);
}
.herometa .install {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 10px 14px;
  background: var(--cream); color: var(--ink);
  border: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 13px;
}
.herometa .prompt { color: var(--ember); }

.install-snippet {
  display: flex;
  flex-direction: column;
  gap: 0;
  background: var(--ink);
  border-radius: 4px;
  overflow: hidden;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
}
.install-snippet__toml {
  padding: 12px 16px 8px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  white-space: pre;
}
.install-snippet__use {
  padding: 8px 16px 12px;
  color: #d8cdb8;
}
.install-snippet .tok-mu  { color: #9b8c7a; }
.install-snippet .tok-kw  { color: #ff8a5b; }
.install-snippet .tok-fn  { color: #f6c016; }
.install-snippet .tok-str { color: #b9e08a; }
.install-snippet .tok-ty  { color: #69d2c5; }

.watch-link {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--rule);
  border-radius: 2px;
  font: 600 13px/1 var(--sans);
  color: var(--ink);
  background: var(--cream);
  transition: border-color .15s, background .15s;
}
.watch-link:hover { border-color: var(--ember); background: var(--cream-deep); }
.watch-icon { color: var(--amber); font-size: 15px; }

/* ==========================================================================
   Code block
   ========================================================================== */

.codeblock {
  background: var(--ink);
  color: #f0e7d8;
  padding: 22px 24px;
  font: 500 14px/1.65 var(--mono);
  position: relative;
  overflow: auto;
}
.codeblock--paper {
  background: var(--cream);
  color: var(--ink);
  border: 1px solid var(--rule);
}
.codeblock--big { padding: 28px 32px; font-size: 15px; line-height: 1.7; }
.codeblock__chrome {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 16px;
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  font: 500 11px/1 var(--mono);
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.06em;
  margin: -22px -24px 16px;
}
.codeblock__dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: rgba(255,255,255,0.18);
  flex-shrink: 0;
}
.codeblock__file { margin-left: 8px; }
.codeblock pre { margin: 0; white-space: pre; }

/* Syntax tokens */
.tok-kw  { color: #ff8a5b; }
.tok-fn  { color: #f6c016; }
.tok-ty  { color: #69d2c5; }
.tok-str { color: #b9e08a; }
.tok-mu  { color: #9b8c7a; }
.tok-at  { color: #e2545b; }
.tok-pun { color: #d8cdb8; }

.codeblock--paper .tok-kw  { color: #b7410e; }
.codeblock--paper .tok-fn  { color: #8a5a00; }
.codeblock--paper .tok-ty  { color: #0a5b50; }
.codeblock--paper .tok-str { color: #3a6b16; }
.codeblock--paper .tok-mu  { color: #8a7e6a; }
.codeblock--paper .tok-at  { color: #c8410b; }
.codeblock--paper .tok-pun { color: var(--ink-soft); }

/* ==========================================================================
   Principles — ink
   ========================================================================== */

.principles-inner { padding: 128px 0 112px; }

.principles-header {
  display: grid; grid-template-columns: 1.1fr 1fr; gap: 72px;
  align-items: center;
  margin-bottom: 88px;
}
.principles-h {
  font: 800 clamp(48px, 5.4vw, 76px)/1.0 var(--sans);
  letter-spacing: -0.024em;
  color: #fff;
  margin: 0 0 28px;
  text-wrap: balance;
}
.principles-triad {
  display: flex; gap: 22px; align-items: baseline; flex-wrap: wrap;
  font: 800 clamp(26px, 2.5vw, 38px)/1 var(--sans);
  letter-spacing: -0.018em;
}

.principles-pillars {
  display: grid; grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid rgba(255,255,255,0.18);
}
.pillar {
  padding: 44px 36px 56px;
  border-right: 1px solid rgba(255,255,255,0.12);
  display: flex; flex-direction: column; gap: 20px;
  position: relative;
}
.pillar:last-child { border-right: none; }
.pillar__stripe {
  position: absolute; top: 0; left: 0;
  height: 5px; width: 88px;
}
.pillar__bg-num {
  position: absolute; top: 28px; right: 28px;
  font: 800 96px/1 var(--sans);
  color: rgba(255,255,255,0.06);
  letter-spacing: -0.04em;
  pointer-events: none;
  user-select: none;
}
.pillar__tag {
  font: 700 12px/1 var(--mono);
  letter-spacing: 0.18em; text-transform: uppercase;
  position: relative; z-index: 1;
}
.pillar__h {
  font: 800 36px/1.05 var(--sans);
  letter-spacing: -0.022em;
  color: #fff; margin: 0;
  text-wrap: balance;
  position: relative; z-index: 1;
  min-height: 114px;
}
.pillar__body {
  font: 400 16px/1.55 var(--sans);
  color: rgba(255,255,255,0.78);
  margin: 0;
  position: relative; z-index: 1;
}
.pillar__list {
  list-style: none; margin: 8px 0 0; padding: 16px 0 0;
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex; flex-direction: column; gap: 10px;
  position: relative; z-index: 1;
}
.pillar__list li {
  font: 500 13px/1.4 var(--mono);
  color: rgba(255,255,255,0.7);
  display: flex; gap: 12px; align-items: flex-start;
}
.pillar__bullet { flex-shrink: 0; margin-top: 2px; }

.principles-kicker {
  display: grid; grid-template-columns: auto 1fr auto; gap: 32px;
  align-items: center;
  margin-top: 72px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.14);
}
.principles-kicker__label {
  font: 700 11px/1 var(--mono);
  color: var(--amber);
  letter-spacing: 0.18em; text-transform: uppercase;
  white-space: nowrap;
}
.principles-kicker__text {
  font: 600 22px/1.3 var(--sans);
  color: #fff;
  letter-spacing: -0.012em;
  text-wrap: balance;
}
.principles-kicker__link {
  display: inline-flex; align-items: center; gap: 10px;
  font: 700 12px/1 var(--mono);
  color: #fff;
  letter-spacing: 0.16em; text-transform: uppercase;
  padding: 14px 18px;
  border: 1px solid rgba(255,255,255,0.4);
  white-space: nowrap;
  transition: background .15s ease;
}
.principles-kicker__link:hover { background: rgba(255,255,255,0.06); }
.principles-tiebreaker {
  margin-top: 24px;
  font: 400 12px/1.5 var(--mono);
  color: rgba(255,255,255,0.42);
}

/* ==========================================================================
   Why Ferra — teal
   ========================================================================== */

.why { padding: 96px 0 112px; }

.why__head {
  display: grid; grid-template-columns: 1fr 1.1fr; gap: 64px;
  align-items: start;
  margin-bottom: 56px;
}
.why__h { color: #fff; }
.why__intro {
  color: rgba(255,255,255,0.85);
  font: 400 19px/1.55 var(--sans);
  padding-top: 29px;
  margin: 0;
  text-wrap: pretty;
}
.why__mapping-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.why__mapping {
  display: grid; grid-template-columns: 0.85fr auto 1.15fr;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.16);
  min-width: 480px;
}
.why__col-head {
  padding: 18px 24px;
  font: 700 12px/1 var(--sans);
  letter-spacing: 0.16em; text-transform: uppercase;
  color: rgba(255,255,255,0.7);
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid rgba(255,255,255,0.16);
}
.why__col-head--mid { background: transparent; }
.why__cell {
  padding: 22px 24px;
  border-top: 1px solid rgba(255,255,255,0.10);
  font: 500 16px/1.45 var(--sans);
  color: #fff;
}
.why__cell--source {
  font-family: var(--mono);
  font-weight: 500; font-size: 14px;
  background: rgba(255,255,255,0.04);
  color: #ffeac8;
  white-space: nowrap;
}
.why__cell--arrow {
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono);
  color: rgba(255,255,255,0.45);
  font-size: 18px;
}
.why__cell--get { color: rgba(255,255,255,0.92); }
.why__cell--get b { color: #f7d046; font-weight: 700; }

.why__benchmark {
  margin-top: 48px;
  display: flex; align-items: center; gap: 24px;
  padding: 24px 28px;
  border-left: 4px solid #f7d046;
  background: rgba(0,0,0,0.18);
}
.why__benchmark .num {
  font: 800 56px/1 var(--sans);
  color: #f7d046;
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.why__benchmark .txt {
  color: rgba(255,255,255,0.85);
  font: 400 16px/1.45 var(--sans);
  text-wrap: pretty;
  max-width: 600px;
}

/* ==========================================================================
   Strengths — white
   ========================================================================== */

.strengths { padding: 112px 0; }
.strengths__head {
  display: grid; grid-template-columns: 1fr 1.2fr; gap: 64px;
  align-items: start;
  margin-bottom: 56px;
}
.strengths__h { margin: 0; }
.strengths__intro {
  font: 400 19px/1.55 var(--sans);
  color: var(--ink-soft);
  padding-top: 29px; margin: 0;
  text-wrap: pretty;
}
.strengths__grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px;
}
.strength {
  padding: 28px 0 0;
  border-top: 4px solid var(--ink);
}
.strength__h {
  font: 700 22px/1.2 var(--sans);
  letter-spacing: -0.005em;
  margin: 0 0 12px;
}
.strength__b {
  font: 400 15px/1.55 var(--sans);
  color: var(--ink-soft);
  margin: 0;
}
.strength__num {
  font-family: var(--mono); font-size: 12px;
  color: var(--ember);
  letter-spacing: 0.12em;
  margin-bottom: 14px;
}

/* ==========================================================================
   Targets — white
   ========================================================================== */

.targets-inner { padding: 96px 0; }
.targets-grid {
  display: grid; grid-template-columns: 1fr 1.35fr; gap: 64px;
  align-items: start;
}
.targets-h {
  font: 800 clamp(36px, 3.6vw, 54px)/1.02 var(--sans);
  letter-spacing: -0.02em;
  text-wrap: balance;
  margin: 0;
}
.targets-tiles {
  display: grid; grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid rgba(0,0,0,0.1);
  border-left: 1px solid rgba(0,0,0,0.1);
  margin-top: 100px;
}
.target-tile {
  padding: 28px;
  border-right: 1px solid rgba(0,0,0,0.1);
  border-bottom: 1px solid rgba(0,0,0,0.1);
  display: flex; flex-direction: column; gap: 6px;
}
.target-tile__k { font: 700 14px/1.2 var(--mono); color: #0c0c0c; }
.target-tile__v { font: 400 14px/1.4 var(--sans); color: var(--ink-mute); }

/* ==========================================================================
   Etymology — cream
   ========================================================================== */

.name { padding: 112px 0; }
.name__lead {
  display: grid; grid-template-columns: 1fr 1.2fr; gap: 80px;
  align-items: start;
  margin-bottom: 56px;
}
.name__h { margin: 0 0 8px; }
.name__sub {
  font: 400 17px/1.6 var(--sans);
  color: var(--ink-soft); margin: 0;
}
.name__quote {
  font: 400 22px/1.45 var(--slab);
  color: var(--ink);
  letter-spacing: -0.005em;
  text-wrap: pretty;
  border-left: 3px solid var(--ember);
  padding-left: 24px;
}
.name__quote em { font-style: italic; color: var(--ember); }

.lineage {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
}
.lineage__cell {
  padding: 28px 24px;
  border-right: 1px solid var(--rule);
}
.lineage__cell:last-child { border-right: 0; }
.lineage__name {
  font-family: var(--slab);
  font-weight: 900; font-size: 28px;
  margin: 0 0 8px;
}
.lineage__cell--active .lineage__name { color: var(--ember); }
.lineage__origin {
  font: 400 14px/1.5 var(--sans);
  color: var(--ink-soft); margin: 0;
}

/* ==========================================================================
   Roadmap — plum
   ========================================================================== */

.roadmap { padding: 112px 0; }
.roadmap__head {
  display: grid; grid-template-columns: 1fr 1.2fr; gap: 64px;
  align-items: end;
  margin-bottom: 64px;
}
.roadmap__h { color: #fff; margin: 0; }
.roadmap__intro {
  color: rgba(255,255,255,0.82);
  font: 400 19px/1.55 var(--sans);
  margin: 0; text-wrap: pretty;
}
.phases {
  display: grid; grid-template-columns: repeat(5, 1fr);
  border-top: 1px solid rgba(255,255,255,0.16);
}
.phase {
  padding: 28px 22px 32px;
  border-right: 1px solid rgba(255,255,255,0.16);
  display: flex; flex-direction: column; gap: 14px;
}
.phase:last-child { border-right: 0; }
.phase__status {
  display: inline-flex; align-items: center; gap: 8px;
  font: 700 11px/1 var(--mono);
  letter-spacing: 0.14em; text-transform: uppercase;
  color: rgba(255,255,255,0.72);
}
.phase__dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: rgba(255,255,255,0.4);
  flex-shrink: 0;
}
.phase--shipped  .phase__dot   { background: #88e0a6; box-shadow: 0 0 0 4px rgba(136,224,166,0.18); }
.phase--shipped  .phase__status { color: #88e0a6; }
.phase--building .phase__dot   { background: var(--amber); box-shadow: 0 0 0 4px rgba(246,192,22,0.18); }
.phase--building .phase__status { color: var(--amber); }
.phase__ver {
  font-family: var(--mono); font-weight: 600; font-size: 13px;
  color: rgba(255,255,255,0.6); letter-spacing: 0.04em;
}
.phase__name {
  font: 800 32px/1.05 var(--sans);
  letter-spacing: -0.015em;
  color: #fff; margin: 0;
}
.phase__desc {
  font: 400 14px/1.5 var(--sans);
  color: rgba(255,255,255,0.78); margin: 0; text-wrap: pretty;
}
.phase__list {
  list-style: none; padding: 0; margin: 8px 0 0;
  display: flex; flex-direction: column; gap: 8px;
  font: 500 13px/1.4 var(--mono);
  color: rgba(255,255,255,0.85);
}
.phase__list li::before { content: "→ "; color: rgba(255,255,255,0.45); }
.phase--building .phase__list li:first-child::before { color: var(--amber); }
.phase--building .phase__list li:first-child { color: #fff; }

.invariant {
  margin-top: 64px; padding: 24px 28px;
  background: rgba(0,0,0,0.22);
  border-left: 4px solid var(--amber);
  display: flex; align-items: baseline; gap: 24px;
}
.invariant__label {
  font: 700 12px/1 var(--mono);
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--amber); white-space: nowrap;
}
.invariant__text {
  font: 500 17px/1.5 var(--sans);
  color: rgba(255,255,255,0.92); text-wrap: pretty;
}
.invariant__text code { color: #ffeac8; }

/* ==========================================================================
   Metrics — white
   ========================================================================== */

.metrics { padding: 112px 0; }
.metrics__head {
  display: grid; grid-template-columns: 1fr 1.2fr; gap: 64px;
  align-items: end;
  margin-bottom: 56px;
}
.metrics__h { margin: 0; }
.metrics__intro {
  font: 400 19px/1.55 var(--sans);
  color: var(--ink-soft); margin: 0; text-wrap: pretty;
}
.metric-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  border-top: 2px solid var(--ink);
  border-left: 1px solid var(--rule);
}
.metric {
  padding: 28px 24px 32px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  display: flex; flex-direction: column; gap: 8px;
}
.metric__label {
  font: 600 13px/1.3 var(--sans);
  text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--ink-mute); text-wrap: pretty;
}
.metric__value {
  font: 800 44px/1 var(--sans);
  letter-spacing: -0.02em; color: var(--ink);
}
.metric__value .unit {
  font-size: 24px; color: var(--ink-mute);
  font-weight: 600; margin-left: 4px;
}
.metric__guard {
  font: 500 12px/1.4 var(--mono);
  color: var(--ember);
  margin-top: auto; padding-top: 14px;
}

/* ==========================================================================
   Footer — iron
   ========================================================================== */

.footer { padding: 56px 0; }
.footer__top {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 48px;
  align-items: start;
}
.footer__brand .mark {
  font-family: var(--slab);
  font-weight: 900; font-size: 36px;
  letter-spacing: -0.01em;
  color: #fff; display: block; margin-bottom: 8px;
}
.footer__brand .dot { color: var(--ember); }
.footer__brand .tag {
  font: 400 14px/1.5 var(--sans);
  color: rgba(255,255,255,0.6);
  max-width: 280px; margin: 0;
}
.footer__col h4 {
  font: 700 12px/1 var(--mono);
  letter-spacing: 0.14em; text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin: 0 0 14px;
}
.footer__col ul {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-direction: column; gap: 10px;
}
.footer__col a {
  font: 500 14px/1.3 var(--sans);
  color: rgba(255,255,255,0.85);
}
.footer__col a:hover { color: #fff; }
.footer__col .placeholder {
  font: 600 9px/1 var(--mono);
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--amber);
  border: 1px dashed var(--amber);
  padding: 3px 5px; margin-left: 6px;
  vertical-align: 2px;
}
.footer__dead {
  font: 500 14px/1.3 var(--sans);
  color: rgba(255,255,255,0.35);
  cursor: default;
  user-select: none;
}
.footer__dead--legal {
  font: 500 13px/1 var(--sans);
  color: rgba(255,255,255,0.3);
}
.footer__rule { height: 1px; background: rgba(255,255,255,0.12); margin: 40px 0 20px; }
.footer__bottom {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font: 500 13px/1 var(--sans);
  color: rgba(255,255,255,0.5);
}
.footer__bottom .legal { display: flex; gap: 24px; }

/* Placeholder marker */
.placeholder-mark {
  font: 600 10px/1 var(--mono);
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ember);
  border: 1px dashed var(--ember);
  padding: 3px 5px; margin-left: 8px;
  vertical-align: 2px;
}

/* ==========================================================================
   Responsive — 1100px (large tablet / small laptop)
   ========================================================================== */

@media (max-width: 1100px) {
  .wrap { padding: 0 32px; }
  .nav  { padding: 20px 32px; }

  .heroA__mark  { font-size: 120px; }
  .heroA__tag   { font-size: 24px; }

  .h-1          { font-size: 46px; }

  .strengths__grid  { gap: 24px; }
  .phases           { grid-template-columns: repeat(3, 1fr); }
  .phase:nth-child(3) { border-right: 0; }
  .phase:nth-child(4) { border-top: 1px solid rgba(255,255,255,0.16); }
  .phase:nth-child(5) { border-top: 1px solid rgba(255,255,255,0.16); }
}

/* ==========================================================================
   Responsive — 900px (tablet)
   ========================================================================== */

@media (max-width: 900px) {
  .heroA__grid     { grid-template-columns: minmax(0, 1fr); gap: 48px; }
  .heroA__grid > * { min-width: 0; }
  .heroA__mark     { font-size: 96px; }
  .hero            { padding: 72px 0 80px; }

  .why__head       { grid-template-columns: 1fr; gap: 24px; }
  .why__intro      { padding-top: 0; }

  .strengths__head { grid-template-columns: 1fr; gap: 24px; }
  .strengths__intro { padding-top: 0; }
  .strengths__grid { grid-template-columns: repeat(2, 1fr); }

  .principles-header { grid-template-columns: 1fr; gap: 40px; margin-bottom: 56px; }
  .principles-pillars { grid-template-columns: 1fr; }
  .pillar {
    border-right: none;
    border-bottom: 1px solid rgba(255,255,255,0.12);
    padding: 36px 0 40px;
  }
  .pillar:last-child { border-bottom: none; }
  .pillar__h { min-height: auto; }
  .principles-kicker { grid-template-columns: 1fr; gap: 20px; }
  .principles-kicker__link { align-self: flex-start; }

  .targets-grid    { grid-template-columns: 1fr; }
  .targets-tiles   { margin-top: 32px; }

  .name__lead      { grid-template-columns: 1fr; gap: 32px; }
  .lineage         { grid-template-columns: repeat(2, 1fr); }
  .lineage__cell:nth-child(2) { border-right: 0; }
  .lineage__cell:nth-child(3) { border-top: 2px solid var(--ink); }

  .roadmap__head   { grid-template-columns: 1fr; gap: 24px; }
  .phases          { grid-template-columns: repeat(2, 1fr); }
  .phase           { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.16); }
  .phase:last-child { border-bottom: none; }
  .phase:nth-child(even) { border-left: 1px solid rgba(255,255,255,0.16); }
  .phase:nth-child(3), .phase:nth-child(4), .phase:nth-child(5) { border-top: none; }

  .metrics__head   { grid-template-columns: 1fr; gap: 24px; }
  .metrics__intro  { padding-top: 0; }
  .metric-grid     { grid-template-columns: repeat(2, 1fr); }

  .footer__top     { grid-template-columns: repeat(2, 1fr); gap: 36px; }
  .footer__brand   { grid-column: 1 / -1; }
}

/* ==========================================================================
   Responsive — 640px (mobile)
   ========================================================================== */

@media (max-width: 640px) {
  .wrap { padding: 0 20px; }
  .nav  { padding: 16px 20px; flex-wrap: wrap; gap: 0; }

  .nav__hamburger { display: flex; }
  .nav__links {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 4px;
    padding: 16px 0 8px;
    border-top: 1px solid var(--rule-soft);
    margin-top: 12px;
  }
  .nav--open .nav__links { display: flex; }
  .nav__links a { padding: 10px 4px; font-size: 16px; }
  .nav__links .pill { align-self: flex-start; margin-top: 4px; }

  .hero          { padding: 48px 0 60px; }
  .heroA__mark   { font-size: 64px; line-height: 0.9; }
  .heroA__tag    { font-size: 20px; }
  .heroA__cta    { flex-direction: column; align-items: flex-start; gap: 16px; }

  .h-1           { font-size: 36px; }
  .h-display     { font-size: 54px; }

  .why           { padding: 64px 0 80px; }
  .why__benchmark { flex-direction: column; align-items: flex-start; gap: 12px; }
  .why__benchmark .num { font-size: 44px; }

  .strengths     { padding: 72px 0; }
  .strengths__grid { grid-template-columns: 1fr; }

  .principles-inner { padding: 72px 0 80px; }
  .principles-h  { font-size: 40px; margin-bottom: 20px; }
  .principles-triad { font-size: 26px; }
  .pillar__h     { font-size: 28px; }
  .principles-kicker { margin-top: 48px; padding-top: 24px; }
  .principles-kicker__text { font-size: 17px; }

  .targets-inner { padding: 64px 0; }
  .targets-tiles { grid-template-columns: 1fr; margin-top: 28px; }

  .name          { padding: 72px 0; }

  .roadmap       { padding: 72px 0; }
  .phases        { grid-template-columns: 1fr; }
  .phase         { border-left: none !important; padding: 28px 0; }
  .phase:not(:last-child) { border-bottom: 1px solid rgba(255,255,255,0.16); }
  .phase__name   { font-size: 24px; }

  .metrics       { padding: 72px 0; }
  .metric-grid   { grid-template-columns: 1fr; }
  .metric__value { font-size: 36px; }

  .footer        { padding: 48px 0 32px; }
  .footer__top   { grid-template-columns: 1fr; gap: 32px; }
  .footer__brand { grid-column: auto; }
  .invariant     { flex-direction: column; gap: 12px; }
}

/* ==========================================================================
   Responsive — 400px (small phones)
   ========================================================================== */

@media (max-width: 400px) {
  .heroA__mark { font-size: 52px; }
  .h-1 { font-size: 30px; }
  .codeblock { font-size: 12px; }
  .btn { padding: 12px 16px; font-size: 12px; }
}

/* ==========================================================================
   Motion / accessibility
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  .btn, .nav__hamburger span { transition: none; }
}