/* Kalman
   Layout: a night cockpit. One glowing instrument (the live Kalman console) anchors the hero;
   every other section sits quietly on a faint navigation grid, precise and spare. */

:root {
  color-scheme: dark;

  /* Palette */
  --bg: #07101f;            /* night navy */
  --panel: #0b1830;         /* instrument panel */
  --panel-raised: #0f2040;
  --line: #1a2c4e;          /* hairlines */
  --line-strong: #2a4470;
  --fg: #e8f1ff;            /* white with a blue cast */
  --muted: #a3b4d1;
  --faint: #7a8eb1;
  --signal: #2ee6ff;        /* electric cyan: the filtered signal, automation */
  --signal-ink: #03121d;    /* text on cyan */
  --signal-soft: rgb(46 230 255 / 0.1);
  --signal-glow: rgb(46 230 255 / 0.45);
  --noise: #ffb547;         /* amber: raw measurements, manual work */
  --noise-glow: rgb(255 181 71 / 0.45);
  --danger: #ff9b9b;
  --grid: rgb(120 170 255 / 0.045);
  --header-bg: rgb(7 16 31 / 0.82);
  --shadow: rgb(0 0 0 / 0.75);

  /* Type */
  --font-display: "Oxanium", "Eurostile", "Segoe UI", system-ui, sans-serif;
  --font-body: "Instrument Sans", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "B612 Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --text-xs: 0.78rem;
  --text-sm: 0.92rem;
  --text-base: 1.0625rem;
  --text-lg: 1.19rem;
  --text-xl: clamp(1.35rem, 1.15rem + 0.8vw, 1.6rem);
  --text-2xl: clamp(1.95rem, 1.35rem + 2.4vw, 2.85rem);
  --text-hero: clamp(2.55rem, 1.35rem + 4.9vw, 4.75rem);

  /* Space */
  --gutter: clamp(16px, 4vw, 40px);
  --max: 74rem;
  --section: clamp(4rem, 2.5rem + 5vw, 6.5rem);
  --radius: 4px;
}

/* ─── Base ─────────────────────────────────────────────────────────────── */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 5.5rem;
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 48px 48px;
  color: var(--fg);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Every text exists in French and English; <html lang> decides which one shows. */
html[lang|="fr"] [lang|="en"],
html[lang|="en"] [lang|="fr"] {
  display: none !important;
}

[hidden] {
  display: none !important;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

h2 {
  font-size: var(--text-2xl);
}

h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: 0;
}

p {
  margin: 0;
}

a {
  color: inherit;
  text-underline-offset: 0.2em;
}

img,
svg,
canvas {
  display: block;
  max-width: 100%;
}

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

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

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

.wrap {
  width: 100%;
  max-width: calc(var(--max) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -4rem;
  z-index: 50;
  padding: 0.6rem 1rem;
  background: var(--signal);
  color: var(--signal-ink);
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus {
  top: calc(env(safe-area-inset-top, 0px) + 0.75rem);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal);
}

/* ─── Buttons ──────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  min-height: 3rem;
  padding: 0.75rem 1.35rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: none;
  color: inherit;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s, border-color 0.2s, color 0.2s, box-shadow 0.25s;
}

.btn svg {
  width: 1.15em;
  height: 1.15em;
  flex: none;
}

.btn-primary {
  background: var(--signal);
  color: var(--signal-ink);
  box-shadow: 0 0 28px -8px var(--signal-glow);
}

.btn-primary:hover {
  box-shadow: 0 0 36px -2px var(--signal-glow);
}

.btn-ghost {
  border-color: var(--line-strong);
  color: var(--fg);
}

.btn-ghost:hover {
  border-color: var(--signal);
  color: var(--signal);
}

.btn-sm {
  min-height: 2.4rem;
  padding: 0.45rem 0.95rem;
  font-size: 0.9rem;
}

.btn-block {
  width: 100%;
}

/* ─── Header ───────────────────────────────────────────────────────────── */

.site-header {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 20;
  background: var(--header-bg);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  min-height: 4.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--fg);
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-decoration: none;
}

.brand-mark {
  width: 2rem;
  height: 2rem;
  flex: none;
}

.mark-k {
  stroke: var(--fg);
}

.mark-path {
  stroke: var(--signal);
  filter: drop-shadow(0 0 3px var(--signal-glow));
}

.mark-dot {
  fill: var(--signal);
}

.mark-noise {
  fill: var(--noise);
}

.nav-links {
  display: flex;
  gap: 1.75rem;
  margin-left: auto;
  font-size: var(--text-sm);
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--fg);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lang-switch {
  display: inline-flex;
  padding: 2px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
}

.lang-switch button {
  padding: 0.35rem 0.6rem;
  border: 0;
  border-radius: 2px;
  background: none;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  cursor: pointer;
}

.lang-switch button:hover {
  color: var(--fg);
}

.lang-switch button[aria-pressed="true"] {
  background: var(--signal-soft);
  color: var(--signal);
}

@media (max-width: 800px) {
  .nav-links {
    display: none;
  }

  .nav-actions {
    margin-left: auto;
  }
}

@media (max-width: 440px) {
  .nav-actions .btn {
    display: none;
  }
}

/* ─── Hero ─────────────────────────────────────────────────────────────── */

.hero {
  position: relative;
  padding-block: clamp(3rem, 1.5rem + 5vw, 6rem) clamp(3.5rem, 2rem + 4vw, 5.5rem);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -30% -20% 10% 30%;
  background: radial-gradient(closest-side, var(--signal-soft), transparent);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  gap: clamp(2.5rem, 5vw, 4.5rem);
  align-items: center;
}

.hero-copy {
  min-width: 0;
}

.hero-title {
  margin-top: 1.25rem;
  font-size: var(--text-hero);
  line-height: 1.02;
  letter-spacing: -0.025em;
}

.hero-title em {
  font-style: normal;
  color: var(--signal);
  text-shadow: 0 0 28px var(--signal-glow);
}

.lede {
  max-width: 36rem;
  margin-top: 1.5rem;
  color: var(--muted);
  font-size: var(--text-lg);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.hero-note {
  margin-top: 1.25rem;
  color: var(--faint);
  font-size: var(--text-sm);
}

@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ─── Autopilot console ────────────────────────────────────────────────── */

.console {
  min-width: 0;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: linear-gradient(180deg, var(--panel-raised), var(--panel));
  box-shadow: 0 30px 80px -40px var(--shadow), 0 0 70px -24px var(--signal-glow);
  font-family: var(--font-mono);
}

.console-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.console-title {
  color: var(--fg);
}

.annunciator {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-left: auto;
  color: var(--signal);
  text-transform: uppercase;
}

.led {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 8px var(--signal);
  animation: led 2.4s ease-in-out infinite;
}

@keyframes led {
  50% {
    opacity: 0.45;
  }
}

.tag {
  padding: 0.1rem 0.4rem;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  color: var(--faint);
  text-transform: uppercase;
}

.chart {
  padding: 0.9rem 1rem 0.5rem;
  border-bottom: 1px solid var(--line);
}

.chart-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.35rem 1rem;
  color: var(--faint);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.legend {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.key-noise {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--noise);
}

.key-signal {
  width: 14px;
  height: 2px;
  background: var(--signal);
  box-shadow: 0 0 6px var(--signal);
}

.chart canvas {
  width: 100%;
  height: 150px;
  margin-top: 0.5rem;
}

.console-log {
  margin: 0;
  padding: 0.55rem 0;
  list-style: none;
  font-size: 0.8rem;
}

.console-log li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 0.9rem;
  padding: 0.42rem 1rem;
}

.console-log li.is-new {
  animation: log-in 0.5s ease-out;
}

@keyframes log-in {
  from {
    opacity: 0.3;
    transform: translateY(6px);
  }
}

.console-log time {
  color: var(--faint);
  font-variant-numeric: tabular-nums;
}

.log-msg {
  min-width: 0;
  color: var(--fg);
}

.log-gain {
  color: var(--signal);
  font-size: 0.72rem;
  white-space: nowrap;
}

.console-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  padding: 0.8rem 1rem 0.9rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.console-foot strong {
  color: var(--signal);
  text-transform: none;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 16px var(--signal-glow);
}

/* ─── Sections ─────────────────────────────────────────────────────────── */

.section {
  padding-block: var(--section);
  border-top: 1px solid var(--line);
}

.section-head {
  display: grid;
  gap: 1rem;
  max-width: 46rem;
  margin-bottom: clamp(2.5rem, 5vw, 3.75rem);
}

.section-intro {
  color: var(--muted);
  font-size: var(--text-lg);
}

/* Manual mode */

.pain-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 2rem clamp(2rem, 6vw, 5.5rem);
  align-items: start;
}

.pain-grid .section-head {
  margin-bottom: 0;
}

.pain-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.pain-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1.1rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
  font-size: var(--text-lg);
}

.pain-list li::before {
  content: "";
  width: 8px;
  height: 8px;
  margin-top: 0.6em;
  border-radius: 50%;
  background: var(--noise);
  box-shadow: 0 0 10px var(--noise-glow);
}

.pain-close {
  grid-column: 2;
  color: var(--signal);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  line-height: 1.35;
  text-wrap: balance;
}

@media (max-width: 880px) {
  .pain-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .pain-close {
    grid-column: auto;
  }
}

/* Services */

.services {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.service {
  display: grid;
  align-content: start;
  gap: 0.75rem;
  padding: clamp(1.5rem, 2.5vw, 2.1rem);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background-color 0.25s;
}

.service:hover {
  background: var(--signal-soft);
}

.service svg {
  width: 28px;
  height: 28px;
  margin-bottom: 0.4rem;
  color: var(--signal);
}

.service p {
  color: var(--muted);
}

.tools {
  max-width: 48rem;
  margin-top: 2rem;
  color: var(--muted);
  font-size: var(--text-sm);
}

@media (max-width: 920px) {
  .services {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 580px) {
  .services {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* How it works: a flight plan, one waypoint per step */

.flightplan {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.flightplan::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 8px;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--signal), var(--line-strong) 75%);
}

.waypoint {
  position: relative;
  display: grid;
  align-content: start;
  gap: 0.6rem;
  padding-top: 2.4rem;
}

.waypoint::before {
  content: "";
  position: absolute;
  top: 1px;
  left: 1px;
  width: 14px;
  height: 14px;
  border: 2px solid var(--signal);
  background: var(--bg);
  transform: rotate(45deg);
}

.waypoint:last-child::before {
  background: var(--signal);
  box-shadow: 0 0 14px var(--signal-glow);
}

.wp-phase {
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.waypoint p:not(.wp-phase) {
  color: var(--muted);
}

.waypoint .wp-meta {
  margin-top: 0.2rem;
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}

@media (max-width: 920px) {
  .flightplan {
    grid-template-columns: minmax(0, 1fr);
    gap: 2.25rem;
  }

  .flightplan::before {
    top: 8px;
    bottom: 8px;
    right: auto;
    width: 1px;
    height: auto;
    background: linear-gradient(180deg, var(--signal), var(--line-strong) 75%);
  }

  .waypoint {
    padding-top: 0;
    padding-left: 2.75rem;
  }
}

/* Why Kalman */

.why-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 2.5rem clamp(2rem, 6vw, 5rem);
  align-items: start;
}

.why-story {
  display: grid;
  gap: 1.25rem;
}

.why-story > p:not(.eyebrow) {
  max-width: 38rem;
  color: var(--muted);
}

.equation {
  display: grid;
  gap: 0.4rem;
  justify-self: start;
  margin: 0.5rem 0 0;
  padding: 1rem 1.25rem;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
}

.equation code {
  color: var(--signal);
  font-size: 1.15rem;
}

.equation figcaption {
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}

.founder {
  display: grid;
  gap: 1.25rem;
  padding: clamp(1.5rem, 3vw, 2.1rem);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--panel);
}

.founder-id {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.monogram {
  display: grid;
  place-items: center;
  width: 3.25rem;
  height: 3.25rem;
  flex: none;
  border: 1px solid var(--signal);
  border-radius: 50%;
  color: var(--signal);
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.06em;
}

.founder-name {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
}

.founder-role {
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.founder blockquote {
  margin: 0;
  font-size: var(--text-lg);
  line-height: 1.55;
}

.principles {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.75rem 2rem;
  margin: clamp(3rem, 6vw, 4.5rem) 0 0;
  padding: 0;
  list-style: none;
}

.principles li {
  display: grid;
  align-content: start;
  gap: 0.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line-strong);
}

.principles h3 {
  font-size: 1.05rem;
}

.principles p {
  color: var(--muted);
  font-size: var(--text-sm);
}

@media (max-width: 920px) {
  .why-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .principles {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* FAQ */

.faq-list {
  max-width: 52rem;
  border-top: 1px solid var(--line);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.3rem 0;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  list-style: none;
  cursor: pointer;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "";
  width: 10px;
  height: 10px;
  flex: none;
  margin-right: 4px;
  border-right: 2px solid var(--signal);
  border-bottom: 2px solid var(--signal);
  transform: translateY(-3px) rotate(45deg);
  transition: transform 0.25s;
}

.faq-list details[open] summary::after {
  transform: translateY(2px) rotate(225deg);
}

.faq-list summary:hover {
  color: var(--signal);
}

.faq-list details > p {
  max-width: 46rem;
  padding-bottom: 1.4rem;
  color: var(--muted);
}

/* Waitlist */

.waitlist-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 2.5rem clamp(2rem, 6vw, 5rem);
  align-items: start;
}

.waitlist-pitch {
  display: grid;
  gap: 1.25rem;
}

.waitlist-pitch > p:not(.eyebrow) {
  color: var(--muted);
  font-size: var(--text-lg);
}

.perks {
  display: grid;
  gap: 0.8rem;
  margin: 0.5rem 0 0;
  padding: 1.25rem 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.perks-title {
  margin-bottom: 0.2rem;
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.perks li:not(.perks-title) {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
}

.perks li:not(.perks-title)::before {
  content: "";
  width: 11px;
  height: 6px;
  flex: none;
  border-left: 2px solid var(--signal);
  border-bottom: 2px solid var(--signal);
  transform: translateY(-0.2em) rotate(-45deg);
}

.waitlist-count {
  color: var(--signal);
  font-family: var(--font-display);
  font-weight: 600;
}

.form-panel {
  padding: clamp(1.5rem, 3.5vw, 2.4rem);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 0 70px -34px var(--signal-glow);
}

.waitlist-form {
  position: relative;
  display: grid;
  gap: 1.25rem;
}

.field-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

@media (max-width: 560px) {
  .field-row {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 900px) {
  .waitlist-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

.field {
  display: grid;
  gap: 0.45rem;
  min-width: 0;
}

.field label {
  font-size: var(--text-sm);
  font-weight: 600;
}

.optional {
  color: var(--faint);
  font-weight: 400;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  min-width: 0;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--fg);
  font: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.field textarea {
  min-height: 5.5rem;
  resize: vertical;
}

.field input::placeholder,
.field textarea::placeholder {
  color: var(--faint);
  opacity: 1;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--signal);
  box-shadow: 0 0 0 3px var(--signal-soft);
}

.field [aria-invalid="true"] {
  border-color: var(--danger);
}

.select {
  position: relative;
}

.select select {
  padding-right: 2.5rem;
  appearance: none;
  cursor: pointer;
}

.select::after {
  content: "";
  position: absolute;
  top: 50%;
  right: 1rem;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--signal);
  border-bottom: 2px solid var(--signal);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}

.consent {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  gap: 0.75rem;
  color: var(--muted);
  font-size: var(--text-sm);
  cursor: pointer;
}

.field .consent {
  font-weight: 400;
}

.consent input {
  width: 1.15rem;
  height: 1.15rem;
  margin: 0.2rem 0 0;
  accent-color: var(--signal);
}

.field-error,
.form-status {
  color: var(--danger);
  font-size: var(--text-sm);
}

.privacy-note {
  color: var(--faint);
  font-size: var(--text-xs);
}

.privacy-note a {
  color: var(--muted);
}

/* Visually removed but still in the DOM, so form-filling bots find it. */
.hp {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.btn .when-busy {
  display: none;
}

.btn[aria-busy="true"] {
  cursor: progress;
  opacity: 0.8;
}

.btn[aria-busy="true"] .when-idle {
  display: none;
}

.btn[aria-busy="true"] .when-busy {
  display: inline;
}

.form-success {
  display: grid;
  gap: 1rem;
}

.form-success:focus {
  outline: none;
}

.success-mark {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border: 1px solid var(--signal);
  border-radius: 50%;
  color: var(--signal);
  box-shadow: 0 0 24px -4px var(--signal-glow);
}

.success-mark svg {
  width: 1.4rem;
  height: 1.4rem;
}

.success-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  line-height: 1.2;
}

.success-position {
  color: var(--signal);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
}

.success-text {
  color: var(--muted);
}

.demo-note {
  color: var(--noise);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.share {
  display: grid;
  gap: 0.65rem;
  margin-top: 0.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.share-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.share-row input {
  flex: 1 1 14rem;
  min-width: 0;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

/* ─── Footer ───────────────────────────────────────────────────────────── */

.site-footer {
  padding-block: 3rem calc(3rem + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  gap: 1.5rem 2rem;
}

.footer-tagline {
  margin-top: 0.85rem;
  color: var(--muted);
  font-size: var(--text-sm);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.5rem;
  font-size: var(--text-sm);
}

.footer-links a {
  color: var(--muted);
}

.footer-links a:hover {
  color: var(--fg);
}

.footer-legal {
  grid-column: 1 / -1;
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ─── Text pages (privacy, 404) ────────────────────────────────────────── */

.doc {
  max-width: 46rem;
  padding-block: clamp(3rem, 2rem + 4vw, 5rem) var(--section);
}

.doc h1 {
  margin: 1rem 0 0.75rem;
  font-size: var(--text-2xl);
}

.doc h2 {
  margin: 2.5rem 0 0.75rem;
  font-size: var(--text-xl);
}

.doc p,
.doc li {
  color: var(--muted);
}

.doc p + p {
  margin-top: 0.9rem;
}

.doc ul {
  display: grid;
  gap: 0.4rem;
  margin: 0.75rem 0 0;
  padding-left: 1.25rem;
}

.doc li::marker {
  color: var(--signal);
}

.doc .updated {
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}

.doc a {
  color: var(--signal);
}

.not-found {
  display: grid;
  gap: 1.25rem;
  justify-items: start;
  padding-block: clamp(4rem, 3rem + 8vw, 9rem);
}

.not-found h1 {
  font-size: var(--text-hero);
}

.not-found p:not(.eyebrow) {
  color: var(--muted);
  font-size: var(--text-lg);
}

/* ─── Motion preferences ───────────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}
