:root {
  --bg: #edf2f1;
  --panel: #fbfcfa;
  --ink: #1b262b;
  --muted: #5d6b70;
  --accent: #c96d4e;
  --accent-dark: #97503a;
  --line: rgba(27, 38, 43, 0.12);
  --shadow: 0 20px 60px rgba(20, 31, 35, 0.08);
  --surface: rgba(251, 253, 250, 0.9);
  --surface-strong: rgba(248, 252, 250, 0.94);
  --surface-cool: rgba(241, 248, 249, 0.9);
  --line-strong: rgba(48, 92, 103, 0.16);
  --button-soft: rgba(243, 249, 248, 0.84);
  --button-soft-hover: rgba(234, 244, 245, 0.94);
  --shadow-soft: 0 16px 38px rgba(36, 58, 64, 0.07);
  --signal-secret-rgb: 48 92 103;
  --signal-public-rgb: 141 166 176;
  --signal-message-rgb: 208 109 79;
  --signal-proof-rgb: 151 95 117;
  --signal-point-rgb: 96 159 176;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(96, 159, 176, 0.16), transparent 32rem),
    radial-gradient(circle at 84% 10%, rgba(201, 109, 78, 0.12), transparent 28rem),
    linear-gradient(180deg, #f8fbf9 0%, var(--bg) 100%);
  color: var(--ink);
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, serif;
}

::selection {
  background: rgba(96, 159, 176, 0.2);
  color: var(--ink);
}

a {
  color: inherit;
}

.shell {
  width: min(1100px, calc(100vw - 2rem));
  margin: 0 auto;
  padding: 3rem 0 4rem;
}

.shell-narrow {
  width: min(860px, calc(100vw - 2rem));
}

.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 3rem;
  border: 1px solid var(--line-strong);
  border-radius: 1.75rem;
  background:
    linear-gradient(180deg, rgba(251, 253, 250, 0.92), rgba(243, 248, 247, 0.9)),
    radial-gradient(circle at 18% 18%, rgba(96, 159, 176, 0.09), transparent 16rem),
    radial-gradient(circle at 84% 18%, rgba(201, 109, 78, 0.08), transparent 14rem);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero::before {
  background:
    radial-gradient(circle at 16% 24%, rgba(96, 159, 176, 0.08), transparent 14rem),
    radial-gradient(circle at 88% 22%, rgba(201, 109, 78, 0.08), transparent 12rem);
  filter: blur(12px);
}

.hero::after {
  background: linear-gradient(120deg, rgba(255, 255, 255, 0.16), transparent 42%);
  mix-blend-mode: soft-light;
  opacity: 0.9;
}

.hero > * {
  position: relative;
  z-index: 1;
}

.hero-compact {
  padding-bottom: 2.5rem;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--accent-dark);
  font-family: "Courier Prime", "Courier New", monospace;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  font-weight: 600;
  line-height: 1;
}

h1 {
  font-size: clamp(2.6rem, 8vw, 5.5rem);
  letter-spacing: -0.04em;
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  letter-spacing: -0.03em;
}

.lede {
  max-width: 48rem;
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.6;
}

.hero-note {
  max-width: 48rem;
  margin: 1rem 0 0;
  color: rgba(27, 38, 43, 0.74);
  font-size: 0.98rem;
  line-height: 1.65;
}

.hero-note a {
  color: rgb(var(--signal-secret-rgb) / 0.9);
  text-decoration-color: rgba(48, 92, 103, 0.36);
  text-underline-offset: 0.14em;
}

.hero-note a:hover,
.hero-note a:focus-visible {
  text-decoration-color: rgba(48, 92, 103, 0.7);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 2rem;
}

.button,
.text-link {
  transition: transform 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.8rem 1.1rem;
  border: 1px solid rgba(48, 92, 103, 0.14);
  border-radius: 999px;
  background: var(--button-soft);
  color: var(--ink);
  box-shadow: 0 8px 18px rgba(36, 58, 64, 0.05);
  text-decoration: none;
}

.button:hover,
.button:focus-visible,
.text-link:hover,
.text-link:focus-visible {
  transform: translateY(-1px);
}

.button:hover,
.button:focus-visible {
  border-color: rgba(48, 92, 103, 0.22);
  background: var(--button-soft-hover);
}

.button-primary {
  border-color: transparent;
  background: linear-gradient(135deg, #d77d5e, #c96d4e 55%, #b4614b);
  box-shadow: 0 12px 26px rgba(151, 95, 117, 0.18);
  color: #fff9f5;
}

.button-primary:hover,
.button-primary:focus-visible {
  background: linear-gradient(135deg, #cf7457, #b85e46 58%, #97503a);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

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

.card {
  min-height: 16rem;
  padding: 1.5rem;
  border: 1px solid var(--line-strong);
  border-radius: 1.4rem;
  background:
    linear-gradient(180deg, rgba(251, 253, 250, 0.95), rgba(242, 248, 248, 0.9)),
    radial-gradient(circle at top right, rgba(96, 159, 176, 0.06), transparent 12rem);
  box-shadow: var(--shadow-soft);
}

.card-label {
  margin: 0 0 0.9rem;
  color: rgb(var(--signal-secret-rgb) / 0.88);
  font-family: "Courier Prime", "Courier New", monospace;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.card p:last-of-type {
  margin-bottom: 0;
}

.card p,
.link-list {
  color: var(--muted);
  line-height: 1.6;
}

.text-link {
  display: inline-block;
  margin-top: 1rem;
  color: rgb(var(--signal-secret-rgb) / 0.92);
  font-weight: 600;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.14em;
}

.link-list {
  margin: 1rem 0 0;
  padding-left: 1.15rem;
}

.protocol {
  font-variant: small-caps;
  letter-spacing: 0.04em;
}

.signal-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}

.signal-copy,
.signal-frame {
  padding: 1.6rem;
  border: 1px solid var(--line-strong);
  border-radius: 1.4rem;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.signal-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.signal-text {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 1.04rem;
  line-height: 1.7;
}

.signal-text code {
  padding: 0.12rem 0.36rem;
  border-radius: 0.4rem;
  background: rgba(24, 33, 31, 0.06);
  font-family: "Courier Prime", "Courier New", monospace;
  font-size: 0.95em;
}

.signal-frame {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 1.1rem;
  background:
    radial-gradient(circle at 50% 36%, rgba(96, 159, 176, 0.12), transparent 16rem),
    radial-gradient(circle at 70% 58%, rgba(201, 109, 78, 0.1), transparent 18rem),
    linear-gradient(180deg, rgba(252, 253, 250, 0.96), rgba(243, 247, 245, 0.92));
  backdrop-filter: blur(12px);
}

.signal-frame::before,
.signal-frame::after {
  content: "";
  position: absolute;
  inset: -8%;
  pointer-events: none;
}

.signal-frame::before {
  background:
    radial-gradient(circle at 24% 44%, rgba(48, 92, 103, 0.07), transparent 18rem),
    radial-gradient(circle at 53% 22%, rgba(96, 159, 176, 0.08), transparent 24rem),
    radial-gradient(circle at 74% 54%, rgba(201, 109, 78, 0.12), transparent 17rem);
  filter: blur(26px);
  opacity: 0.9;
  animation: signal-atmosphere 18s ease-in-out infinite alternate;
}

.signal-frame::after {
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.12), transparent 34%),
    repeating-linear-gradient(
      120deg,
      rgba(255, 255, 255, 0.08) 0 22px,
      rgba(255, 255, 255, 0) 22px 44px
    );
  mix-blend-mode: soft-light;
  opacity: 0.22;
  animation: signal-sheen 24s linear infinite;
}

.signal-frame > * {
  position: relative;
  z-index: 1;
}

.signal-diagram {
  display: block;
  width: 100%;
  height: auto;
}

.signal-track {
  fill: none;
  stroke-linecap: round;
  stroke-width: 3.5;
  stroke-dasharray: 5 16;
  opacity: 0.92;
  animation: signal-flow-ltr 12s linear infinite;
}

.signal-track-soft {
  fill: none;
  stroke-linecap: round;
  stroke-width: 14;
  opacity: 0.2;
  pointer-events: none;
  filter: blur(10px);
}

.signal-track-soft-center {
  stroke: rgba(48, 92, 103, 0.18);
}

.signal-track-soft-proof {
  stroke: rgba(151, 95, 117, 0.22);
}

.signal-track-soft-verify {
  stroke: rgba(96, 159, 176, 0.18);
}

.signal-track-secret {
  stroke: rgb(var(--signal-secret-rgb) / 0.68);
}

.signal-track-public {
  stroke: rgb(var(--signal-public-rgb) / 0.54);
}

.signal-track-message {
  stroke: rgb(var(--signal-message-rgb) / 0.76);
}

.signal-track-proof {
  stroke: rgb(var(--signal-proof-rgb) / 0.82);
}

.signal-track-proof-builder {
  stroke: rgb(var(--signal-proof-rgb) / 0.72);
  stroke-width: 3;
  stroke-dasharray: 6 14;
  animation-duration: 10s;
}

.signal-track-purify-r {
  stroke: rgb(var(--signal-secret-rgb) / 0.74);
  stroke-width: 4.5;
  stroke-dasharray: 8 18;
  animation-duration: 10s;
}

.signal-track-verify-r {
  stroke: rgb(var(--signal-point-rgb) / 0.56);
  stroke-width: 4.5;
  stroke-dasharray: 8 18;
  animation-duration: 10s;
}

.signal-track-rtl {
  animation-name: signal-flow-rtl;
}

.signal-pulse-layer {
  pointer-events: none;
}

.signal-divider {
  stroke: rgba(24, 33, 31, 0.1);
  stroke-width: 1.5;
  stroke-dasharray: 2 12;
}

.signal-node {
  stroke: rgba(24, 33, 31, 0.12);
  stroke-width: 1.5;
  filter: drop-shadow(0 0 6px rgba(255, 248, 239, 0.34));
}

.signal-node-secret {
  fill: rgb(var(--signal-secret-rgb));
}

.signal-node-message {
  fill: rgb(var(--signal-message-rgb));
}

.signal-node-public {
  fill: rgb(var(--signal-public-rgb) / 0.3);
}

.signal-node-proof {
  fill: rgb(var(--signal-proof-rgb) / 0.88);
}

.signal-beacon {
  fill: rgb(var(--signal-message-rgb) / 0.08);
  stroke: rgb(var(--signal-message-rgb) / 0.26);
  stroke-width: 2.2;
  opacity: 0;
  pointer-events: none;
  filter: blur(1.2px);
  transform-box: fill-box;
  transform-origin: center;
  animation: signal-beacon 12s linear infinite;
  animation-delay: calc(var(--signal-hit) - 1.32s);
}

.signal-beacon-purify {
  --signal-hit: 1.36s;
}

.signal-beacon-scalar {
  --signal-hit: 2.68s;
}

.signal-beacon-prover {
  --signal-hit: 4.58s;
}

.signal-beacon-verify {
  fill: rgb(var(--signal-point-rgb) / 0.05);
  stroke: rgb(var(--signal-point-rgb) / 0.18);
  --signal-hit: 8.14s;
}

.signal-beacon-point {
  fill: rgb(var(--signal-point-rgb) / 0.12);
  stroke: rgb(var(--signal-point-rgb) / 0.34);
  --signal-hit: 9.46s;
}

.signal-pulse-dot {
  opacity: 0;
  stroke: rgba(255, 248, 239, 0.82);
  stroke-width: 1.1;
  filter: drop-shadow(0 0 10px rgba(255, 248, 239, 0.92));
}

.signal-pulse-dot-secret {
  fill: rgb(var(--signal-secret-rgb));
}

.signal-pulse-dot-public {
  fill: rgb(var(--signal-public-rgb) / 0.72);
}

.signal-pulse-dot-message {
  fill: rgb(var(--signal-message-rgb));
}

.signal-pulse-dot-proof {
  fill: rgb(var(--signal-proof-rgb));
}

.signal-scalar {
  fill: rgba(251, 250, 247, 0.98);
  stroke: rgb(var(--signal-secret-rgb) / 0.16);
  stroke-width: 1.5;
  filter: drop-shadow(0 10px 18px rgba(24, 33, 31, 0.06));
}

.signal-scalar-ring {
  fill: none;
  stroke: rgb(var(--signal-secret-rgb) / 0.18);
  stroke-width: 1.8;
}

.signal-core {
  fill: rgba(251, 250, 247, 0.96);
  stroke: rgb(var(--signal-secret-rgb) / 0.12);
  stroke-width: 1.5;
  filter: drop-shadow(0 14px 28px rgba(24, 33, 31, 0.07));
}

.signal-core-public {
  fill: rgba(244, 249, 250, 0.96);
}

.signal-core-ring,
.signal-output-ring {
  fill: none;
  stroke-width: 1.8;
}

.signal-core-ring {
  stroke: rgb(var(--signal-message-rgb) / 0.22);
  stroke-dasharray: 2 10;
  animation: signal-spin 22s linear infinite;
}

.signal-core-ring-public {
  stroke: rgb(var(--signal-point-rgb) / 0.18);
}

.signal-stage {
  transform-box: fill-box;
  transform-origin: center;
  animation: signal-stage 12s linear infinite;
  animation-delay: calc(var(--signal-hit) - 1.32s);
}

.signal-stage-purify {
  --signal-hit: 1.36s;
}

.signal-stage-scalar {
  --signal-hit: 2.68s;
}

.signal-stage-prover {
  --signal-hit: 4.58s;
}

.signal-stage-verify {
  --signal-hit: 8.14s;
}

.signal-stage-point {
  --signal-hit: 9.46s;
}

.signal-point-group {
  transform-box: fill-box;
  transform-origin: center;
}

.signal-point {
  fill: rgb(var(--signal-point-rgb) / 0.96);
  stroke: rgba(248, 252, 250, 0.82);
  stroke-width: 2.4;
  filter: drop-shadow(0 16px 26px rgba(62, 120, 136, 0.18));
}

.signal-point-ring {
  fill: none;
  stroke: rgb(var(--signal-point-rgb) / 0.28);
  stroke-width: 8;
  filter: drop-shadow(0 0 18px rgba(96, 159, 176, 0.12));
}

.signal-prover-box {
  fill: rgba(244, 236, 223, 0.94);
  stroke: rgba(24, 33, 31, 0.12);
  stroke-width: 1.4;
  filter: drop-shadow(0 12px 18px rgba(24, 33, 31, 0.06));
}

.signal-half-title {
  fill: var(--accent-dark);
  font-family: "Courier Prime", "Courier New", monospace;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.signal-scalar-label {
  fill: var(--ink);
  font-family: "Courier Prime", "Courier New", monospace;
  font-size: 0.96rem;
  letter-spacing: 0.06em;
}

.signal-label,
.signal-core-label,
.signal-prover-label {
  fill: var(--ink);
  font-family: "Courier Prime", "Courier New", monospace;
  font-size: 0.96rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.signal-caption,
.signal-core-caption,
.signal-output-caption,
.signal-note {
  color: var(--muted);
  fill: var(--muted);
  font-family: "Courier Prime", "Courier New", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.02em;
}

.signal-point-label {
  fill: #fff8ef;
  font-family: "Courier Prime", "Courier New", monospace;
  font-size: 1rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.signal-label-tight {
  font-size: 0.84rem;
}

.signal-caption-tight {
  font-size: 0.68rem;
}

.signal-note {
  margin: 0.35rem 0 0;
}

@keyframes signal-flow-ltr {
  to {
    stroke-dashoffset: 240;
  }
}

@keyframes signal-flow-rtl {
  to {
    stroke-dashoffset: -240;
  }
}

@keyframes signal-spin {
  to {
    stroke-dashoffset: -180;
  }
}

@keyframes signal-atmosphere {
  0% {
    transform: translate3d(-2%, -1%, 0) scale(1);
    opacity: 0.82;
  }

  50% {
    transform: translate3d(1.5%, 1.2%, 0) scale(1.04);
    opacity: 0.96;
  }

  100% {
    transform: translate3d(3%, -1.5%, 0) scale(1.02);
    opacity: 0.86;
  }
}

@keyframes signal-sheen {
  0% {
    transform: translate3d(-4%, 0, 0);
    opacity: 0.12;
  }

  50% {
    opacity: 0.22;
  }

  100% {
    transform: translate3d(4%, 0, 0);
    opacity: 0.1;
  }
}

@keyframes signal-stage {
  0%,
  7.5%,
  100% {
    transform: scale(1);
  }

  10.5% {
    transform: scale(1.045);
  }

  14% {
    transform: scale(1);
  }
}

@keyframes signal-beacon {
  0%,
  100% {
    opacity: 0;
    transform: scale(0.95);
  }

  8% {
    opacity: 0;
    transform: scale(0.95);
  }

  10.8% {
    opacity: 0.88;
    transform: scale(1);
  }

  14.5% {
    opacity: 0;
    transform: scale(1.08);
  }
}

@media (max-width: 860px) {
  .shell {
    width: min(100vw - 1.25rem, 100%);
    padding: 1rem 0 2.5rem;
  }

  .hero {
    padding: 1.6rem;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .signal-panel {
    grid-template-columns: 1fr;
  }

  .signal-copy,
  .signal-frame {
    padding: 0.9rem;
  }

  .card {
    min-height: auto;
  }

  .signal-label,
  .signal-core-label,
  .signal-scalar-label,
  .signal-point-label,
  .signal-prover-label {
    font-size: 0.76rem;
  }

  .signal-caption,
  .signal-core-caption,
  .signal-output-caption {
    font-size: 0.58rem;
  }

  .signal-half-title {
    font-size: 0.64rem;
  }

  .signal-label-tight {
    font-size: 0.7rem;
  }

  .signal-caption-tight {
    font-size: 0.56rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .signal-track,
  .signal-core-ring,
  .signal-stage,
  .signal-beacon,
  .signal-frame::before,
  .signal-frame::after {
    animation: none !important;
  }

  .signal-pulse-layer {
    display: none;
  }
}