/* Tappy — brand is lime #9FE870, ink #163300, white. Lime means approved and nothing else;
   red appears only where something refuses. */

:root {
  --ink: #163300;
  --ink-lift: #1d4300;
  --lime: #9fe870;
  --lime-dim: #cdeeb6;
  --paper: #f2f2f0;
  --rule: #dde2d8;
  --alarm: #c2352a;
  --alarm-soft: #f7dedb;
  --sans: "Hanken Grotesk", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --gutter: clamp(20px, 5vw, 64px);
  --wide: 1180px;
}

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

html {
  scroll-behavior: smooth;
}

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

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.62;
  color: var(--ink);
  background: var(--ink);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.05;
}

p {
  margin: 0 0 1em;
}

a {
  color: inherit;
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
}

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

:focus-visible {
  /* currentColor so the ring is legible on the ink, lime and white grounds alike */
  outline: 3px solid currentColor;
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- header ---------- */

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  max-width: var(--wide);
  margin: 0 auto;
  padding: 26px var(--gutter) 8px;
  color: var(--lime);
}

.mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.mark svg,
.foot-mark svg {
  width: 30px;
  height: 30px;
  fill: none;
  stroke: currentColor;
  stroke-width: 3;
  opacity: 0.85;
}

.mark .solid,
.foot-mark .solid {
  fill: currentColor;
  opacity: 1;
}

.bar nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 30px);
  font-size: 0.98rem;
  font-weight: 500;
}

.bar nav a {
  color: var(--lime-dim);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}

.bar nav a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.bar .bar-cta {
  padding: 7px 18px;
  border: 1px solid rgba(159, 232, 112, 0.45);
  border-radius: 999px;
  color: var(--lime);
}

.bar .bar-cta:hover {
  background: var(--lime);
  color: var(--ink);
  border-color: var(--lime);
}

/* ---------- hero ---------- */

.hero {
  max-width: var(--wide);
  margin: 0 auto;
  padding: clamp(30px, 5vw, 56px) var(--gutter) clamp(56px, 9vw, 104px);
  color: #fff;
}

.hero-top {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(24px, 5vw, 60px);
  align-items: end;
  margin-bottom: clamp(36px, 5vw, 60px);
}

.hero h1 {
  font-size: clamp(2.6rem, 6.4vw, 4.6rem);
  line-height: 0.98;
  letter-spacing: -0.035em;
  color: var(--lime);
}

.hero .lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(1rem, 1.25vw, 1.14rem);
  color: rgba(255, 255, 255, 0.78);
}

/* the machine: left is what is proposed, right is what the phone does about it */

.machine {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  border-radius: 32px;
  overflow: hidden;
  scroll-margin-top: 24px;
}

.machine h2 {
  font-size: 1.28rem;
  letter-spacing: -0.02em;
}

.machine .half-note {
  margin: 10px 0 26px;
  font-size: 0.95rem;
  line-height: 1.5;
  max-width: 42ch;
}

.machine-half {
  padding: clamp(24px, 3.4vw, 38px);
}

.tx {
  background: var(--ink-lift);
  color: #fff;
}

.tx h2 {
  color: var(--lime);
}

.tx .half-note {
  color: rgba(255, 255, 255, 0.62);
}

.field {
  display: block;
  margin-bottom: 20px;
}

.field > span {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--lime-dim);
  margin-bottom: 4px;
}

.field input {
  width: 100%;
  font-family: inherit;
  font-size: 1.02rem;
  font-weight: 500;
  color: #fff;
  background: transparent;
  border: 0;
  border-bottom: 1px solid rgba(159, 232, 112, 0.4);
  border-radius: 0;
  padding: 6px 0;
}

.field input.mono {
  font-size: 0.92rem;
  letter-spacing: -0.01em;
}

.field input:focus {
  outline: none;
  border-bottom-color: var(--lime);
}

.field input:focus-visible {
  outline: none;
  box-shadow: 0 2px 0 var(--lime);
}

.amount .input-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  border-bottom: 1px solid rgba(159, 232, 112, 0.4);
}

.amount .input-row:focus-within {
  border-bottom-color: var(--lime);
}

.amount input {
  font-size: 2.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  border-bottom: 0;
  padding-bottom: 2px;
}

.amount input:focus-visible {
  box-shadow: none;
}

.amount em {
  font-style: normal;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--lime);
}

.field-pair {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 18px;
}

.fixed-note {
  margin: 4px 0 24px;
  font-size: 0.86rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.62);
}

.fixed-note b {
  font-weight: 500;
  color: rgba(255, 255, 255, 0.82);
}

.tx-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: 999px;
  cursor: pointer;
}

.btn-ghost {
  color: var(--lime);
  background: transparent;
  border: 1px solid rgba(159, 232, 112, 0.45);
}

.btn-ghost:hover {
  background: var(--lime);
  color: var(--ink);
  border-color: var(--lime);
}

.btn-ghost[data-active="true"] {
  background: var(--alarm);
  border-color: var(--alarm);
  color: #fff;
}

/* the verdict half carries the whole point, so it changes surface, not just a label */

.phone {
  background: var(--lime);
  color: var(--ink);
  display: flex;
  flex-direction: column;
}

.phone .half-note {
  color: rgba(22, 51, 0, 0.78);
}

.phone[data-state="refused"] {
  background: var(--alarm);
  color: #fff;
}

.phone[data-state="refused"] h2,
.phone[data-state="invalid"] h2 {
  color: inherit;
}

.phone[data-state="refused"] .half-note {
  color: rgba(255, 255, 255, 0.8);
}

.phone[data-state="invalid"] {
  background: #46503f;
  color: #fff;
}

.phone[data-state="invalid"] .half-note {
  color: rgba(255, 255, 255, 0.7);
}

.hash {
  margin-bottom: 18px;
}

.hash-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  opacity: 0.78;
  margin-bottom: 6px;
}

.digest {
  display: block;
  font-size: clamp(0.78rem, 1.5vw, 0.95rem);
  line-height: 1.5;
  word-break: break-all;
  font-weight: 500;
}

.server .digest {
  opacity: 0.86;
  text-decoration: line-through;
  text-decoration-thickness: 1px;
}

.state {
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid color-mix(in srgb, currentColor 32%, transparent);
}

.state-title {
  margin: 0 0 4px;
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.state-body {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.55;
  max-width: 46ch;
}

.vector-check {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(22, 51, 0, 0.25);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.5;
}

.vector-check[data-ok="true"]::before {
  content: "✓ ";
}

.vector-check[data-ok="false"] {
  color: var(--alarm);
}

/* ---------- shared section furniture ---------- */

.section-head {
  font-size: clamp(1.85rem, 3.6vw, 2.7rem);
  max-width: 20ch;
}

.section-lede {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: 1.1rem;
  opacity: 0.72;
}

.flow,
.shots,
.attack,
.check,
.limits {
  padding: clamp(56px, 8vw, 104px) var(--gutter);
}

.flow > *,
.shots > *,
.attack > *,
.check > *,
.limits > * {
  max-width: var(--wide);
  margin-inline: auto;
}

/* ---------- how it works ---------- */

.flow {
  background: #fff;
}

.steps {
  list-style: none;
  margin: clamp(36px, 5vw, 56px) auto 0;
  padding: 0;
}

.steps li {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: clamp(16px, 4vw, 48px);
  padding: 26px 0;
  border-top: 1px solid var(--rule);
}

.steps li:last-child {
  border-bottom: 1px solid var(--rule);
}

.sig {
  font-family: var(--mono);
  font-size: 0.92rem;
  font-weight: 500;
  color: rgba(22, 51, 0, 0.68);
  padding-top: 4px;
}

.sig.done {
  color: var(--ink);
  font-weight: 700;
}

.steps h3 {
  font-size: 1.32rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.steps p {
  margin: 0;
  max-width: 62ch;
  color: rgba(22, 51, 0, 0.78);
}

/* ---------- screenshots ---------- */

.shots {
  background: var(--lime);
}

.shot-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(16px, 2.5vw, 30px);
  margin-top: clamp(36px, 5vw, 56px);
}

.shot-row figure {
  margin: 0;
}

.shot-row img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 22px;
  border: 1px solid rgba(22, 51, 0, 0.12);
}

.shot-row figcaption {
  margin-top: 14px;
  font-size: 0.95rem;
  line-height: 1.5;
  color: rgba(22, 51, 0, 0.82);
}

.shot-row figure:first-child figcaption {
  font-weight: 600;
  color: var(--ink);
}

/* ---------- the attack ---------- */

.attack {
  background: var(--ink);
  color: #fff;
}

.attack .section-head {
  color: var(--lime);
}

.attack-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: clamp(28px, 5vw, 64px);
  margin-top: clamp(32px, 4vw, 48px);
  align-items: start;
}

.attack-grid p {
  max-width: 58ch;
  color: rgba(255, 255, 255, 0.76);
}

.attack-punch {
  color: #fff;
  font-size: 1.18rem;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 0;
}

.injection {
  margin: 0;
  padding: 24px;
  border-radius: 20px;
  border: 1px solid rgba(194, 53, 42, 0.55);
  background: rgba(194, 53, 42, 0.12);
}

.injection .hash-label {
  opacity: 0.7;
}

.injection p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.88);
}

.injection .payload {
  color: #ff9b91;
}

/* ---------- claims ---------- */

.check {
  background: #fff;
}

.claims {
  list-style: none;
  margin: clamp(36px, 5vw, 56px) auto 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(28px, 4vw, 52px);
}

.claims h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
  max-width: 30ch;
}

.claims p {
  max-width: 52ch;
  color: rgba(22, 51, 0, 0.78);
}

.claims a {
  font-family: var(--mono);
  font-size: 0.85rem;
  text-decoration-color: rgba(22, 51, 0, 0.3);
  text-underline-offset: 4px;
}

.claims a:hover {
  text-decoration-color: currentColor;
}

/* ---------- limits ---------- */

.limits {
  background: var(--paper);
}

.limit-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
  margin-top: clamp(28px, 4vw, 44px);
}

.limit-grid p {
  margin: 0;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  font-size: 0.98rem;
  color: rgba(22, 51, 0, 0.75);
}

.limit-grid b {
  color: var(--ink);
}

/* ---------- footer ---------- */

footer {
  background: var(--ink);
  color: var(--lime);
  padding: clamp(48px, 7vw, 80px) var(--gutter);
  display: grid;
  gap: 28px;
  max-width: var(--wide);
  margin-inline: auto;
}

.foot-mark {
  display: flex;
  align-items: center;
  gap: 14px;
}

.foot-mark p {
  margin: 0;
  font-size: clamp(1.2rem, 2.4vw, 1.7rem);
  font-weight: 700;
  letter-spacing: -0.025em;
}

.foot-links {
  display: flex;
  gap: 26px;
  flex-wrap: wrap;
  font-size: 0.98rem;
}

.foot-links a {
  color: var(--lime-dim);
  text-underline-offset: 4px;
}

.foot-links a:hover {
  color: var(--lime);
}

.foot-fine {
  margin: 0;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.5);
}

/* ---------- narrow ---------- */

@media (max-width: 900px) {
  .hero-top,
  .machine,
  .attack-grid,
  .claims,
  .limit-grid {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .hero .lede {
    max-width: 60ch;
  }

  .steps li {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .sig {
    padding-top: 0;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 16px;
  }

  .shot-row {
    grid-template-columns: minmax(0, 1fr);
    max-width: 380px;
  }

  .bar nav {
    width: 100%;
    justify-content: space-between;
    gap: 12px;
    font-size: 0.9rem;
  }

  .field-pair {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }
}