:root {
  color-scheme: dark;
  --bg: #09120f;
  --bg-soft: #0d1915;
  --panel: #10211b;
  --panel-light: #152a22;
  --line: rgba(205, 255, 223, 0.14);
  --line-strong: rgba(205, 255, 223, 0.28);
  --text: #f2f7f4;
  --muted: #aabbb2;
  --green: #8bf0a7;
  --green-bright: #b7ff64;
  --cyan: #6fe4dc;
  --amber: #ffc66d;
  --max-width: 74rem;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 20rem;
  color: var(--text);
  background:
    radial-gradient(circle at 72% 8%, rgba(73, 176, 119, 0.14), transparent 24rem),
    radial-gradient(circle at 16% 33%, rgba(44, 149, 140, 0.08), transparent 22rem),
    var(--bg);
  line-height: 1.6;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.65rem 0.9rem;
  color: var(--bg);
  background: var(--green-bright);
  border-radius: 0.35rem;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header,
main,
footer {
  width: min(calc(100% - 2.5rem), var(--max-width));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 5.5rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  gap: 0.65rem;
  align-items: center;
  font-weight: 750;
  letter-spacing: -0.025em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  color: var(--bg);
  background: var(--green-bright);
  border-radius: 0.3rem;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.72rem;
  font-weight: 900;
  box-shadow: 0 0 1.5rem rgba(183, 255, 100, 0.16);
}

nav {
  display: flex;
  gap: clamp(1rem, 3vw, 2rem);
  align-items: center;
}

nav a {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 650;
  text-decoration: none;
}

nav a:hover,
nav a:focus-visible,
footer a:hover,
footer a:focus-visible,
.text-link:hover,
.text-link:focus-visible {
  color: var(--green-bright);
}

nav .nav-cta {
  padding: 0.55rem 0.85rem;
  color: var(--text);
  border: 1px solid var(--line-strong);
  border-radius: 0.35rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(19rem, 0.88fr);
  gap: clamp(3rem, 8vw, 7rem);
  align-items: center;
  min-height: 43rem;
  padding-block: 5rem;
}

.eyebrow {
  margin: 0 0 1.2rem;
  color: var(--green);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.status-dot {
  display: inline-block;
  width: 0.48rem;
  height: 0.48rem;
  margin-right: 0.5rem;
  background: var(--green-bright);
  border-radius: 50%;
  box-shadow: 0 0 0.8rem var(--green-bright);
}

h1,
h2,
h3,
p {
  text-wrap: pretty;
}

h1 {
  max-width: 12ch;
  margin: 0;
  font-size: clamp(3.2rem, 7.2vw, 6.4rem);
  line-height: 0.96;
  letter-spacing: -0.065em;
}

h1 span {
  color: var(--green-bright);
}

.thesis {
  max-width: 40rem;
  margin: 2rem 0 0;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  line-height: 1.5;
}

.alpha-note,
.section-heading > p:last-child,
.boundary-detail,
.tester-section p,
.privacy-note p {
  color: var(--muted);
}

.alpha-note {
  max-width: 39rem;
  margin: 0.85rem 0 0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  gap: 0.75rem;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.75rem 1rem;
  border: 1px solid transparent;
  border-radius: 0.35rem;
  font-size: 0.9rem;
  font-weight: 800;
  text-decoration: none;
}

.button-primary {
  color: #07100c;
  background: var(--green-bright);
  box-shadow: 0 0.7rem 2rem rgba(112, 212, 113, 0.12);
}

.button-primary:hover,
.button-primary:focus-visible {
  background: #c9ff8b;
  transform: translateY(-1px);
}

.button-secondary {
  color: var(--text);
  background: rgba(255, 255, 255, 0.025);
  border-color: var(--line-strong);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  border-color: var(--green);
}

.download-note {
  margin: 0.8rem 0 0;
  color: #83968c;
  font-size: 0.78rem;
}

.signal-card {
  position: relative;
  padding: 1.25rem;
  overflow: hidden;
  background: linear-gradient(145deg, rgba(22, 48, 37, 0.92), rgba(10, 24, 19, 0.95));
  border: 1px solid var(--line-strong);
  border-radius: 0.7rem;
  box-shadow: 0 2rem 5rem rgba(0, 0, 0, 0.32);
}

.signal-card::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
  background-image: linear-gradient(rgba(255,255,255,0.018) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.018) 1px, transparent 1px);
  background-size: 1.5rem 1.5rem;
  mask-image: linear-gradient(to bottom, black, transparent 80%);
}

.signal-header,
.signal-result {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.signal-header {
  padding-bottom: 1rem;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.signal-live {
  padding: 0.25rem 0.45rem;
  color: var(--green);
  background: rgba(139, 240, 167, 0.08);
  border: 1px solid rgba(139, 240, 167, 0.22);
  border-radius: 999px;
}

.signal-task {
  position: relative;
  display: grid;
  gap: 0.25rem;
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--line);
}

.signal-label {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.66rem;
  letter-spacing: 0.08em;
}

code {
  width: fit-content;
  padding: 0.08rem 0.35rem;
  color: var(--cyan);
  background: rgba(111, 228, 220, 0.06);
  border-radius: 0.2rem;
  font-size: 0.78em;
}

.signal-list {
  position: relative;
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.signal-list li {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.75rem;
  align-items: center;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line);
}

.signal-list li > span:last-child {
  display: grid;
  min-width: 0;
}

.signal-list strong {
  overflow: hidden;
  font-size: 0.86rem;
  text-overflow: ellipsis;
}

.signal-list small {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.58rem;
}

.signal-icon {
  display: grid;
  width: 1.65rem;
  height: 1.65rem;
  place-items: center;
  border-radius: 50%;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.75rem;
  font-weight: 900;
}

.signal-ok {
  color: var(--green);
  background: rgba(139, 240, 167, 0.08);
  border: 1px solid rgba(139, 240, 167, 0.24);
}

.signal-review {
  color: var(--amber);
  background: rgba(255, 198, 109, 0.08);
  border: 1px solid rgba(255, 198, 109, 0.3);
}

.signal-result {
  padding-top: 1rem;
  color: var(--muted);
}

.signal-result strong {
  color: var(--amber);
}

.signal-card > p {
  position: relative;
  margin: 0.85rem 0 0;
  color: #7f9489;
  font-size: 0.7rem;
}

.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-block: 1px solid var(--line);
}

.principles div {
  display: grid;
  gap: 0.2rem;
  padding: 1.6rem clamp(1rem, 3vw, 2.25rem);
}

.principles div + div {
  border-left: 1px solid var(--line);
}

.principles strong {
  font-size: 0.85rem;
}

.principles span {
  color: var(--muted);
  font-size: 0.78rem;
}

.section {
  padding-block: clamp(5rem, 10vw, 8rem);
}

.section-heading {
  max-width: 46rem;
  margin-bottom: 3rem;
}

h2 {
  margin: 0;
  font-size: clamp(2.25rem, 5vw, 4.25rem);
  line-height: 1.03;
  letter-spacing: -0.052em;
}

.section-heading > p:last-child {
  max-width: 42rem;
  margin-top: 1.3rem;
  font-size: 1.05rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--line);
  border-radius: 0.55rem;
}

.feature-card {
  min-height: 18rem;
  padding: clamp(1.5rem, 3vw, 2.25rem);
}

.feature-card + .feature-card {
  border-left: 1px solid var(--line);
}

.card-number {
  color: var(--green);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.72rem;
}

h3 {
  margin: 4rem 0 0.75rem;
  font-size: 1.25rem;
  letter-spacing: -0.025em;
}

.feature-card p,
.boundary-grid li {
  color: var(--muted);
  font-size: 0.92rem;
}

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

.boundary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  overflow: hidden;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 0.55rem;
}

.boundary-grid > div {
  padding: clamp(1.5rem, 4vw, 3rem);
  background: var(--bg-soft);
}

.boundary-grid h3 {
  margin: 0 0 1.5rem;
}

.boundary-grid h3::before {
  display: inline-grid;
  width: 1.5rem;
  height: 1.5rem;
  margin-right: 0.65rem;
  place-items: center;
  border-radius: 50%;
  font-size: 0.72rem;
  vertical-align: 0.1rem;
}

.boundary-positive h3::before {
  color: var(--green);
  content: "✓";
  border: 1px solid rgba(139, 240, 167, 0.3);
}

.boundary-limit h3::before {
  color: var(--amber);
  content: "!";
  border: 1px solid rgba(255, 198, 109, 0.34);
}

.boundary-grid ul {
  display: grid;
  gap: 0.9rem;
  margin: 0;
  padding-left: 1.2rem;
}

.boundary-detail {
  max-width: 62rem;
  margin: 1.5rem 0 0;
  font-size: 0.86rem;
}

.tester-section {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(17rem, 0.8fr);
  gap: 4rem;
  align-items: end;
  margin-bottom: 3rem;
  padding-inline: clamp(1.5rem, 5vw, 4rem);
  background: linear-gradient(120deg, rgba(20, 54, 40, 0.9), rgba(13, 31, 24, 0.8));
  border: 1px solid var(--line-strong);
  border-radius: 0.7rem;
}

.tester-section h2 {
  max-width: 13ch;
}

.tester-actions {
  display: grid;
  gap: 1rem;
  justify-items: start;
}

.text-link {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
}

.privacy-note {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
  max-width: 48rem;
  margin: 0 auto 7rem;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
}

.privacy-icon {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  color: var(--cyan);
  border: 1px solid rgba(111, 228, 220, 0.28);
  border-radius: 50%;
}

.privacy-note h2 {
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.privacy-note p {
  margin: 0.3rem 0 0;
  font-size: 0.82rem;
}

footer {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1.5rem;
  align-items: center;
  padding-block: 2rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
}

footer p {
  margin: 0;
  text-align: center;
}

footer > a:last-child {
  justify-self: end;
}

:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 4px;
}

@media (max-width: 52rem) {
  nav a:not(.nav-cta) {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .signal-card {
    width: min(100%, 34rem);
  }

  .principles,
  .card-grid,
  .boundary-grid,
  .tester-section {
    grid-template-columns: 1fr;
  }

  .principles div + div,
  .feature-card + .feature-card {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .feature-card {
    min-height: 14rem;
  }

  footer {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  footer p {
    text-align: left;
  }

  footer > a:last-child {
    justify-self: start;
  }
}

@media (max-width: 32rem) {
  .site-header,
  main,
  footer {
    width: min(calc(100% - 1.5rem), var(--max-width));
  }

  .hero {
    padding-block: 3.5rem;
  }

  h1 {
    font-size: clamp(2.85rem, 15vw, 4rem);
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .tester-section {
    gap: 2.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}