/* SilverLabs Computers — landing page styles
 * Brand palette (locked): Obsidian, Silver Coat, Bone, Signal Blue, Ember
 * Institutional posture: hairlines, no shadows, no gradients, sharp corners.
 */

:root {
  /* Brand colors (non-negotiable) */
  --obsidian: #1A1A1A;
  --silver:   #C0C0C0;
  --bone:     #FAFAF7;
  --signal:   #185FA5;
  --signal-press: #134A82;
  --ember:    #D85A30;

  /* Working tones derived from the brand */
  --ink:           #0E0E0E;            /* deepest near-black for dark sections */
  --bone-deep:     #F2F1EA;            /* slightly recessed bone for inset blocks */
  --bone-rule:     rgba(26,26,26,0.12);
  --ink-rule:      rgba(255,255,255,0.10);
  --bone-fg:       #1A1A1A;
  --bone-muted:    #5A5A57;
  --ink-fg:        #FAFAF7;
  --ink-muted:     #8A8A86;

  /* Type */
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", "Menlo", monospace;

  /* Layout */
  --page-max: 1240px;
  --measure: 640px;
  --gutter: 32px;

  /* Spacing */
  --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: 160px;

  /* Hairlines & focus */
  --hair: 1px;
  --focus: 0 0 0 2px var(--signal);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  overflow-x: hidden;
  background: var(--bone);
  color: var(--bone-fg);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}


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

button {
  font-family: inherit;
}

::selection {
  background: var(--signal);
  color: var(--bone);
}

/* ---------- Type system ---------- */

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--bone-muted);
  margin: 0 0 var(--s-5);
  font-weight: 500;
}
.dark .eyebrow { color: var(--ink-muted); }

.h-display {
  font-family: var(--sans);
  font-weight: 500;
  font-size: clamp(40px, 5.6vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.025em;
  text-wrap: balance;
  margin: 0;
}

.h-section {
  font-family: var(--sans);
  font-weight: 500;
  font-size: clamp(30px, 3.4vw, 46px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  text-wrap: balance;
  margin: 0 0 var(--s-6);
}

.h-card {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 21px;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 var(--s-3);
}

.lead {
  font-size: 19px;
  line-height: 1.55;
  max-width: 640px;
  margin: 0 0 var(--s-6);
  color: inherit;
}

.body p { margin: 0 0 var(--s-4); }
.body p:last-child { margin-bottom: 0; }

.muted { color: var(--bone-muted); }
.dark .muted { color: var(--ink-muted); }

.mono {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0;
}

/* ---------- Layout primitives ---------- */

.page {
  width: 100%;
}

.section {
  padding: var(--s-10) var(--gutter);
  position: relative;
}
@media (max-width: 760px) {
  .section { padding: var(--s-8) var(--s-5); }
}

.section.dark {
  background: var(--ink);
  color: var(--ink-fg);
}
.section.light {
  background: var(--bone);
  color: var(--bone-fg);
}
.section.bone-deep {
  background: var(--bone-deep);
}

.wrap {
  max-width: var(--page-max);
  margin: 0 auto;
}

.divider-top {
  position: absolute;
  top: 0; left: var(--gutter); right: var(--gutter);
  height: 1px;
  background: var(--bone-rule);
}
.dark .divider-top { background: var(--ink-rule); }

/* ---------- Header (sticky) ---------- */

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(26,26,26,0.92);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  color: var(--ink-fg);
  border-bottom: 1px solid var(--ink-rule);
  transform: translateY(-100%);
  transition: transform 220ms ease-out;
}
.site-header.is-visible {
  transform: translateY(0);
}

.site-header .row {
  max-width: var(--page-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--s-3) var(--gutter);
  gap: var(--s-5);
}

.site-header nav {
  display: flex;
  gap: var(--s-6);
  font-size: 14px;
  color: var(--ink-muted);
}
.site-header nav a { transition: color 120ms ease-out; }
.site-header nav a:hover { color: var(--ink-fg); }

@media (max-width: 760px) {
  .site-header nav { display: none; }
}

/* ---------- Wordmark ---------- */

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  font-family: var(--sans);
  letter-spacing: -0.01em;
}
.wordmark .glyph {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  display: block;
}
.wordmark .name {
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.015em;
}
/* Tri-tone wordmark colors */
.wordmark .name .silver { color: var(--silver); }
.light .wordmark .name .silver { color: #8A8A86; }
.wordmark .name .labs { color: inherit; }
.wordmark .tag .slash { color: var(--ember); }
.wordmark .tag .comp  { color: var(--signal); }
.light .wordmark .tag .slash { color: var(--ember); }
.light .wordmark .tag .comp  { color: var(--signal); }
.wordmark .tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
  margin-left: 4px;
  text-transform: uppercase;
}
.light .wordmark .tag { color: var(--bone-muted); }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--sans);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: 0.005em;
  padding: 14px 22px;
  min-height: 48px;
  border: 1px solid transparent;
  border-radius: 2px;
  cursor: pointer;
  transition: background-color 140ms ease-out, color 140ms ease-out, border-color 140ms ease-out, transform 80ms ease-out;
  text-decoration: none;
  white-space: nowrap;
}
.btn.primary {
  background: var(--signal);
  color: #FFFFFF;
  border-color: var(--signal);
}
.btn.primary:hover {
  background: var(--signal-press);
  border-color: var(--signal-press);
}
.btn.primary:active { transform: translateY(1px); }

.btn.ghost-dark {
  background: transparent;
  color: var(--ink-fg);
  border-color: rgba(250,250,247,0.22);
}
.btn.ghost-dark:hover {
  border-color: var(--ink-fg);
}

.btn.sm {
  min-height: 38px;
  padding: 8px 16px;
  font-size: 14px;
}

.text-link {
  color: var(--silver);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color 140ms ease-out, border-color 140ms ease-out;
  font-size: 15px;
}
.dark .text-link:hover { color: var(--bone); border-bottom-color: var(--silver); }
.light .text-link { color: var(--bone-muted); }
.light .text-link:hover { color: var(--obsidian); border-bottom-color: var(--bone-muted); }

/* ---------- Hero ---------- */

.hero {
  min-height: 100vh;
  padding-top: calc(var(--s-9) + 24px);
  padding-bottom: var(--s-9);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hero-top {
  max-width: var(--page-max);
  margin: 0 auto;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--gutter);
  position: absolute;
  top: var(--s-5);
  left: 0;
  right: 0;
}
.hero-top .right {
  display: flex;
  gap: var(--s-5);
  align-items: center;
  font-size: 13px;
  color: var(--ink-muted);
}
.hero-top .right .mono { font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; }
@media (max-width: 760px) {
  .hero-top .right .mono { display: none; }
}

.hero-body {
  max-width: var(--page-max);
  margin: 0 auto;
  width: 100%;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: var(--s-8);
  align-items: end;
}
@media (max-width: 980px) {
  .hero-body { grid-template-columns: 1fr; gap: var(--s-7); align-items: start; }
}

.hero-copy { padding-top: var(--s-8); }
.hero-copy .eyebrow { color: var(--silver); }
.hero-copy .h-display { color: var(--ink-fg); }
.hero-copy .sub {
  margin-top: var(--s-6);
  font-size: 19px;
  line-height: 1.55;
  color: rgba(250,250,247,0.78);
  max-width: 560px;
}

.hero-cta {
  margin-top: var(--s-7);
  display: flex;
  align-items: center;
  gap: var(--s-5);
  flex-wrap: wrap;
}

.hero-visual {
  position: relative;
  min-height: 360px;
  border: 1px solid var(--ink-rule);
  padding: var(--s-6);
  background:
    linear-gradient(transparent calc(100% - 1px), rgba(255,255,255,0.04) 0) repeat,
    linear-gradient(90deg, transparent calc(100% - 1px), rgba(255,255,255,0.04) 0) repeat;
  background-size: 32px 32px;
}

.hero-foot {
  max-width: var(--page-max);
  margin: var(--s-9) auto 0;
  width: 100%;
  padding: var(--s-5) var(--gutter) 0;
  border-top: 1px solid var(--ink-rule);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--ink-muted);
  font-size: 13px;
}
@media (max-width: 760px) {
  .hero-foot { flex-direction: column; gap: var(--s-3); align-items: flex-start; }
}

.tagline {
  font-family: var(--sans);
  font-style: italic;
  font-weight: 400;
  color: var(--silver);
  letter-spacing: -0.005em;
}

/* ---------- Section header pattern ---------- */

.sect-head {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--s-8);
  margin-bottom: var(--s-8);
  align-items: end;
}
@media (max-width: 860px) {
  .sect-head { grid-template-columns: 1fr; gap: var(--s-3); margin-bottom: var(--s-6); }
}
.sect-head .right {
  max-width: 720px;
}

/* ---------- Grids ---------- */

.cols-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-7);
}
.cols-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-6);
}
.cols-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s-6);
}
@media (max-width: 860px) {
  .cols-2, .cols-3, .cols-4 { grid-template-columns: 1fr; gap: var(--s-6); }
}

/* ---------- Card (hairline-bounded content block) ---------- */

.card {
  padding: var(--s-6) 0;
  border-top: 1px solid var(--bone-rule);
}
.dark .card { border-top-color: var(--ink-rule); }
.card .index {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--bone-muted);
  margin-bottom: var(--s-3);
}
.dark .card .index { color: var(--ink-muted); }

/* ---------- Step list ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--ink-rule);
  border-bottom: 1px solid var(--ink-rule);
}
@media (max-width: 980px) {
  .steps { grid-template-columns: 1fr; }
}
.step {
  padding: var(--s-6) var(--s-5);
  border-right: 1px solid var(--ink-rule);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
}
.step:last-child { border-right: none; }
@media (max-width: 980px) {
  .step { border-right: none; border-bottom: 1px solid var(--ink-rule); }
  .step:last-child { border-bottom: none; }
}
.step .num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ember);
  text-transform: uppercase;
}
.step h4 {
  font-size: 18px;
  font-weight: 500;
  margin: 0;
  letter-spacing: -0.01em;
  color: var(--ink-fg);
}
.step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink-muted);
}
.step .meta {
  margin-top: auto;
  padding-top: var(--s-4);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--silver);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ---------- Workflow cards ---------- */

.workflow {
  padding: var(--s-6) 0;
  border-top: 1px solid var(--bone-rule);
  display: grid;
  grid-template-columns: 180px 1fr 220px;
  gap: var(--s-6);
  align-items: start;
}
@media (max-width: 860px) {
  .workflow { grid-template-columns: 1fr; gap: var(--s-3); }
}
.workflow .domain {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--bone-muted);
  text-transform: uppercase;
  padding-top: 4px;
}
.workflow h4 {
  font-size: 22px;
  font-weight: 500;
  margin: 0 0 var(--s-3);
  letter-spacing: -0.015em;
}
.workflow p {
  margin: 0;
  color: var(--bone-muted);
  max-width: 540px;
}
.workflow .delta {
  text-align: right;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--bone-fg);
  letter-spacing: 0.01em;
  padding-top: 4px;
}
.workflow .delta .from {
  color: var(--bone-muted);
  text-decoration: line-through;
}
.workflow .delta .to {
  color: var(--signal);
  font-weight: 600;
}
@media (max-width: 860px) {
  .workflow .delta { text-align: left; }
}

/* ---------- Fit / Not-fit ---------- */

.fit {
  padding: var(--s-7);
  border: 1px solid var(--ink-rule);
}
.fit h4 {
  margin: 0 0 var(--s-5);
  font-size: 14px;
  letter-spacing: 0.1em;
  font-family: var(--mono);
  text-transform: uppercase;
  font-weight: 500;
  color: var(--silver);
}
.fit.good h4 { color: var(--signal); }
.fit.not h4  { color: var(--ember); }
.fit ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
}
.fit li {
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink-fg);
  padding-left: 22px;
  position: relative;
}
.fit li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 12px;
  height: 1px;
  background: currentColor;
}
.fit.good li::before { background: var(--signal); }
.fit.not  li::before { background: var(--ember); }

/* ---------- Ledger ---------- */

.ledger {
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.7;
  background: var(--bone-deep);
  border: 1px solid var(--bone-rule);
  padding: var(--s-6);
  color: var(--bone-fg);
  overflow-x: auto;
  white-space: nowrap;
}
.dark .ledger,
.ledger.dark {
  background: rgba(255,255,255,0.02);
  border-color: var(--ink-rule);
  color: var(--ink-fg);
}
.ledger .row {
  display: grid;
  grid-template-columns: 90px 130px 1fr auto;
  gap: var(--s-5);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 240ms ease-out, transform 240ms ease-out;
  white-space: nowrap;
}
.ledger.in .row,
.ledger .row.in { opacity: 1; transform: none; }
.ledger .ts { color: var(--bone-muted); }
.dark .ledger .ts,
.ledger.dark .ts { color: var(--ink-muted); }
.ledger .key { color: var(--obsidian); font-weight: 500; }
.dark .ledger .key,
.ledger.dark .key { color: var(--bone); }
.ledger .val { color: var(--bone-muted); }
.dark .ledger .val,
.ledger.dark .val { color: var(--ink-muted); }
.ledger .ok { color: var(--signal); font-weight: 600; }
.ledger .deny { color: var(--ember); font-weight: 600; }
.ledger .row.danger .val { color: var(--ember); }

@media (max-width: 760px) {
  .ledger { font-size: 11px; padding: var(--s-4); }
  .ledger .row { grid-template-columns: 70px 110px 1fr auto; gap: var(--s-3); }
}

/* ---------- Assessment block ---------- */

.assessment {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--s-9);
  align-items: start;
}
@media (max-width: 980px) {
  .assessment { grid-template-columns: 1fr; gap: var(--s-7); }
}

.spec {
  border-top: 1px solid var(--ink-rule);
}
.spec .row {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: var(--s-5);
  padding: var(--s-4) 0;
  border-bottom: 1px solid var(--ink-rule);
  align-items: baseline;
}
@media (max-width: 760px) {
  .spec .row { grid-template-columns: 1fr; gap: var(--s-1); padding: var(--s-3) 0; }
}
.spec .k {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.spec .v { color: var(--ink-fg); font-size: 16px; }
.spec .v.big {
  font-size: 32px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--ink-fg);
  font-family: var(--sans);
}
.spec .v .note { display: block; color: var(--ink-muted); font-size: 13px; margin-top: 2px; }

/* ---------- FAQ ---------- */

.faq-item {
  border-top: 1px solid var(--bone-rule);
  padding: var(--s-5) 0;
}
.faq-item:last-child { border-bottom: 1px solid var(--bone-rule); }
.faq-item summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--s-5);
  font-size: 19px;
  font-weight: 500;
  letter-spacing: -0.01em;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary .toggle {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--bone-muted);
  font-weight: 400;
  transition: color 120ms ease-out;
}
.faq-item[open] summary .toggle { color: var(--signal); }
.faq-item .answer {
  margin-top: var(--s-4);
  max-width: 720px;
  color: var(--bone-muted);
  font-size: 16.5px;
  line-height: 1.6;
}
.faq-item .answer p { margin: 0 0 var(--s-3); }
.faq-item .answer p:last-child { margin-bottom: 0; }

/* ---------- Final CTA ---------- */

.final {
  text-align: left;
  padding: var(--s-11) var(--gutter);
}
.final .h-display { color: var(--ink-fg); max-width: 14ch; }
.final .tagline { display: block; margin-top: var(--s-5); font-size: 17px; }
.final .cta-row { margin-top: var(--s-8); display: flex; gap: var(--s-5); flex-wrap: wrap; align-items: center; }
.final .small {
  margin-top: var(--s-5);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--ink-muted);
  text-transform: uppercase;
}

/* ---------- Footer ---------- */

.footer {
  background: var(--ink);
  color: var(--ink-fg);
  border-top: 1px solid var(--ink-rule);
  padding: var(--s-7) var(--gutter) var(--s-5);
}
.footer .row {
  max-width: var(--page-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--s-6);
  padding-bottom: var(--s-6);
  border-bottom: 1px solid var(--ink-rule);
}
@media (max-width: 760px) {
  .footer .row { grid-template-columns: 1fr 1fr; gap: var(--s-5); }
}
.footer h5 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-weight: 500;
  margin: 0 0 var(--s-4);
}
.footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: var(--s-3); font-size: 14px; }
.footer li a { color: var(--silver); transition: color 120ms ease-out; }
.footer li a:hover { color: var(--bone); }
.footer .colophon {
  max-width: var(--page-max);
  margin: var(--s-5) auto 0;
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
@media (max-width: 760px) {
  .footer .colophon { flex-direction: column; gap: var(--s-2); }
}

/* ---------- Scroll reveal ---------- */

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 480ms ease-out, transform 480ms ease-out;
}
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 60ms; }
.reveal.d2 { transition-delay: 120ms; }
.reveal.d3 { transition-delay: 180ms; }
.reveal.d4 { transition-delay: 240ms; }

@media (prefers-reduced-motion: reduce) {
  .reveal, .ledger .row, .site-header { transition: none !important; }
  .reveal { opacity: 1; transform: none; }
  .ledger .row { opacity: 1; transform: none; }
}

/* ---------- Architecture diagram (hero variant + arch section) ---------- */

.diagram {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-fg);
  width: 100%;
  height: 100%;
  display: block;
}
.diagram .lbl { fill: var(--silver); font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; }
.diagram .spec-line { fill: var(--silver); font-size: 11px; letter-spacing: 0.01em; text-transform: none; }
.diagram .ttl { fill: var(--ink-fg); font-size: 13px; letter-spacing: 0.01em; }
.diagram .stroke { stroke: var(--silver); stroke-width: 1; fill: none; }
.diagram .stroke-mute { stroke: rgba(192,192,192,0.35); stroke-width: 1; fill: none; }
.diagram .stroke-deny { stroke: var(--ember); stroke-width: 1; fill: none; stroke-dasharray: 3 3; }
.diagram .deny { fill: var(--ember); }
.diagram .accent { fill: var(--signal); }

/* ---------- Wordmark hero (big) ---------- */

.wordmark-hero {
  font-family: var(--sans);
  font-weight: 500;
  font-size: clamp(80px, 16vw, 200px);
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--ink-fg);
  user-select: none;
}
.wordmark-hero .silver { color: var(--silver); }
.wordmark-hero .tag .slash { color: var(--ember); }
.wordmark-hero .tag {
  display: block;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ember);
  margin-top: var(--s-5);
  font-weight: 400;
}

/* ---------- Cursor blink for ledger ---------- */

.blink::after {
  content: "▌";
  margin-left: 4px;
  color: var(--signal);
  animation: blink 1s steps(2) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ---------- Signal-pulse animations (architecture diagram) ---------- */

/* Border breathing pulse on the SL-NODE box — synced with signal arrivals */
.diagram .node-pulse {
  opacity: 0;
  animation: nodePulse 2.4s ease-out infinite;
  animation-delay: 1.05s; /* arrival of firm→node pulse */
  transform-origin: center;
  pointer-events: none;
}
@keyframes nodePulse {
  0%   { opacity: 0; }
  4%   { opacity: 0.55; }
  60%  { opacity: 0; }
  100% { opacity: 0; }
}

/* LED activity pulse on the isometric rack */
.diagram .led-pulse {
  transform-origin: center;
  transform-box: fill-box;
  animation: ledPulse 1.8s ease-in-out infinite;
}
@keyframes ledPulse {
  0%, 100% { opacity: 0.35; }
  40%      { opacity: 1;    }
  60%      { opacity: 1;    }
}

/* ---------- Ember sweep line (architecture dt labels) ---------- */
@keyframes ember-sweep {
  0%   { left: -40%; }
  100% { left: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  .diagram .signal-pulse,
  .diagram .node-pulse { display: none !important; }
  .diagram .led-pulse  { animation: none !important; opacity: 0.85 !important; }
}

/* ---------- Misc utilities ---------- */

.row-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-5);
}
.kicker {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ember);
}
.spacer-1 { height: var(--s-4); }
.spacer-2 { height: var(--s-7); }

/* ---------- Booking modal ---------- */

.modal-scrim {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(14,14,14,0.62);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: var(--s-8) var(--s-5);
  overflow-y: auto;
  animation: scrimIn 160ms ease-out;
}
@keyframes scrimIn { from { opacity: 0; } to { opacity: 1; } }

.modal-panel {
  background: var(--bone);
  color: var(--bone-fg);
  border: 1px solid var(--obsidian);
  border-radius: 2px;
  width: 100%;
  max-width: 520px;
  padding: var(--s-7);
  margin: auto;
  animation: panelIn 200ms cubic-bezier(0.16, 1, 0.3, 1);
}
@keyframes panelIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

.modal-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--s-5);
  margin-bottom: var(--s-4);
}
.modal-x {
  appearance: none;
  border: 1px solid var(--bone-rule);
  background: transparent;
  color: var(--bone-muted);
  width: 34px;
  height: 34px;
  border-radius: 2px;
  cursor: pointer;
  font-size: 13px;
  flex-shrink: 0;
  transition: border-color 120ms ease-out, color 120ms ease-out;
}
.modal-x:hover { border-color: var(--obsidian); color: var(--obsidian); }

.modal-intro {
  margin: 0 0 var(--s-6);
  color: var(--bone-muted);
  font-size: 15px;
  line-height: 1.55;
  max-width: 42ch;
}

.modal-form {
  display: flex;
  flex-direction: column;
  gap: var(--s-5);
}
.field { display: flex; flex-direction: column; gap: var(--s-2); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-5); }
@media (max-width: 480px) { .field-row { grid-template-columns: 1fr; } }

.modal-form label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--bone-muted);
}
.modal-form label .opt { color: var(--bone-rule); text-transform: none; letter-spacing: 0; }

.modal-form input,
.modal-form select,
.modal-form textarea {
  font-family: var(--sans);
  font-size: 15.5px;
  color: var(--bone-fg);
  background: var(--bone-deep);
  border: 1px solid var(--bone-rule);
  border-radius: 2px;
  padding: 11px 13px;
  width: 100%;
  transition: border-color 120ms ease-out, box-shadow 120ms ease-out;
}
.modal-form textarea { resize: vertical; line-height: 1.5; }
.modal-form input:focus,
.modal-form select:focus,
.modal-form textarea:focus {
  outline: none;
  border-color: var(--signal);
  box-shadow: 0 0 0 1px var(--signal);
}
.modal-form input::placeholder,
.modal-form textarea::placeholder { color: var(--bone-rule); }

.modal-form .btn.primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.modal-note {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--bone-muted);
  line-height: 1.5;
  text-align: center;
}


/* ============================================================
   MOBILE RESPONSIVE FIXES
   ============================================================ */

/* Force all content to stay within viewport */
.page { overflow-x: hidden; max-width: 100vw; }
.section { overflow: hidden; }

/* SVG diagrams: constrain to container */
.hero-visual svg,
.diagram {
  max-width: 100%;
  height: auto;
}
.hero-visual {
  overflow: hidden;
  max-width: 100%;
}

/* ---- Small screens (≤ 760px) ---- */
@media (max-width: 760px) {
  :root {
    --gutter: 20px;
  }

  /* Hero top bar: stack wordmark + CTA */
  .hero-top {
    flex-wrap: wrap;
    gap: var(--s-3);
    top: var(--s-4);
  }
  .hero-top .wordmark .tag { display: none; }
  .hero-top .right .btn { font-size: 12px; padding: 10px 16px; }

  /* Hero body */
  .hero-copy { padding-top: var(--s-6); }
  .hero-copy .sub { font-size: 16px; }
  .hero-visual { min-height: 240px; padding: var(--s-4); }

  /* Hero foot */
  .hero-foot .mono { font-size: 10px; }

  /* Sticky header */
  .site-header .row { padding: 0 var(--s-4); }
  .site-header .btn.sm { font-size: 11px; padding: 8px 12px; white-space: nowrap; }
  .site-header .wordmark .tag { display: none; }

  /* Section heads */
  .sect-head .eyebrow { font-size: 11px; }
  .h-section { font-size: clamp(24px, 6vw, 36px); }

  /* Stats row */
  .cols-3 .card,
  .cols-2 .card { padding: var(--s-5); }

  /* Workflow cards */
  .workflow h4 { font-size: 18px; }
  .workflow .delta { text-align: left; }

  /* Ledger: tighten for small screens */
  .ledger .row {
    grid-template-columns: 1fr;
    gap: 2px;
    padding: 6px 0;
  }
  .ledger .row .ts { display: none; }
  .ledger .row .key { font-size: 11px; }
  .ledger .row .val { font-size: 11px; white-space: normal; word-break: break-word; }

  /* Architecture section: dl grid */
  .reveal.d2 dl .r,
  div[style*="grid-template-columns: 120px"],
  .arch-row {
    grid-template-columns: 1fr !important;
    gap: 4px !important;
  }

  /* Assessment spec */
  .assessment aside { position: static !important; }

  /* Fit section lists */
  .fit ul { padding-left: var(--s-5); }
  .fit li { font-size: 15px; }

  /* FAQ */
  .faq-item summary span:first-child { font-size: 16px; }

  /* Final CTA */
  .final .h-display { font-size: clamp(28px, 7vw, 48px); }
  .cta-row { flex-direction: column; align-items: flex-start; }

  /* Footer */
  .footer .row { gap: var(--s-5); }
  .footer h5 { font-size: 13px; }
}

/* ---- Very small screens (≤ 480px) ---- */
@media (max-width: 480px) {
  .hero-top .right .btn { font-size: 11px; padding: 8px 14px; }
  .h-display { font-size: clamp(32px, 8vw, 48px); }
  .hero-copy .sub { font-size: 15px; }
  .ledger { font-size: 10px; padding: var(--s-3); }
  .workflow .domain { font-size: 11px; }
  .step h4 { font-size: 16px; }
  .step p { font-size: 13px; }
}

/* ============================================================
   MOBILE OVERFLOW SAFETY NET
   Grid items default to min-width:auto (= min-content), which lets any
   wide child (nowrap button, long unbreakable word, fixed-px element)
   blow out the track. Force min-width:0 on every direct grid child so
   tracks honor their declared widths, and allow long heads/buttons to
   wrap on narrow screens.
   ============================================================ */

.cols-2 > *,
.cols-3 > *,
.cols-4 > *,
.hero-body > *,
.assessment > *,
.steps > *,
.workflow > *,
.spec .row > *,
.sect-head > *,
.footer .row > * {
  min-width: 0;
}

/* Headings and long text: allow soft breaks before they push width */
.h-display,
.h-section,
.h-card,
.faq-item summary,
.workflow h4,
.step h4 {
  overflow-wrap: break-word;
  word-break: normal;
}

/* Buttons: by default nowrap looks good on desktop, but on narrow
   screens a 100%-width button with a long label should wrap rather
   than balloon its container. */
@media (max-width: 760px) {
  .btn { white-space: normal; text-align: center; line-height: 1.25; }

  /* Assessment aside: shrink internal padding so the inner button fits
     without forcing the grid track to 388px. */
  .assessment aside > div { padding: var(--s-5) !important; }
  .assessment aside { position: static !important; }

  /* Hero visual: keep the SVG sized to its container, not its viewBox. */
  .hero-visual { padding: var(--s-4); }
  .hero-visual svg, .diagram { width: 100%; height: auto; max-width: 100%; display: block; }

  /* Hero top: let the wordmark + CTA stack cleanly without overlap */
  .hero-top { position: static; padding: 0 var(--gutter) var(--s-4); }
  .hero-top .right { flex-wrap: wrap; gap: var(--s-3); }
  .hero { padding-top: var(--s-7); }

  /* Hero foot: long compliance line should wrap, not clip */
  .hero-foot .mono { white-space: normal; word-spacing: 0.05em; }

  /* Sticky header: hide the wide CTA on the smallest sticky bar; the
     hero CTA is one tap away. */
  .site-header .row { gap: var(--s-3); }
  .site-header .btn.sm { display: none; }

  /* Final CTA spacing on small screens */
  .final { padding: var(--s-9) var(--gutter); }

  /* Architecture row: the inline 120px column was overriding our
     mobile collapse. Force single column here too. */
  .arch-row { grid-template-columns: 1fr !important; gap: 4px !important; }

  /* Ledger should never force horizontal scroll — let values wrap. */
  .ledger { white-space: normal; overflow-x: visible; }
  .ledger .row .val { white-space: normal; word-break: break-word; }
}

/* Long URLs / emails should break before overflowing */
.text-link, a[href^="mailto:"] { overflow-wrap: anywhere; word-break: break-word; }

/* Belt-and-braces: nothing in the page should be wider than the viewport */
html, body { max-width: 100%; }
.page, .section, .wrap { max-width: 100vw; }