:root {
  --bg: #f7f5f0;
  --surface: #fffdf8;
  --surface-strong: #111111;
  --text: #171717;
  --muted: #62605b;
  --line: #ded8cb;
  --accent: #4f46e5;
  --accent-soft: #e8e6ff;
  --green: #0f8f70;
  --shadow: 0 24px 70px rgba(26, 22, 16, 0.08);
  --radius-lg: 32px;
  --radius-md: 22px;
  --radius-sm: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(79, 70, 229, 0.13), transparent 34rem),
    radial-gradient(circle at 80% 12%, rgba(15, 143, 112, 0.12), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(1180px, calc(100% - 32px));
  margin: 18px auto 0;
  padding: 12px 14px 12px 16px;
  border: 1px solid rgba(222, 216, 203, 0.76);
  border-radius: 999px;
  background: rgba(255, 253, 248, 0.78);
  backdrop-filter: blur(18px);
  box-shadow: 0 16px 50px rgba(26, 22, 16, 0.06);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.brand-mark {
  position: relative;
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 50%;
  background: var(--surface-strong);
}

.brand-mark span {
  position: absolute;
  width: 8px;
  height: 8px;
  border: 2px solid #fffdf8;
  border-radius: 50%;
}

.brand-mark span:nth-child(1) {
  transform: translate(-7px, -6px);
}

.brand-mark span:nth-child(2) {
  transform: translate(8px, -1px);
}

.brand-mark span:nth-child(3) {
  transform: translate(-1px, 9px);
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  width: 17px;
  height: 2px;
  border-radius: 999px;
  background: #fffdf8;
  content: "";
}

.brand-mark::before {
  transform: rotate(19deg) translate(1px, -3px);
}

.brand-mark::after {
  transform: rotate(-52deg) translate(-2px, 4px);
}

.brand-text {
  font-size: 1.03rem;
}

.brand-text span {
  color: var(--accent);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav a {
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
}

.site-nav a:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.nav-toggle {
  display: none;
  border: 0;
  border-radius: 999px;
  background: var(--surface-strong);
  color: #fffdf8;
  cursor: pointer;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  padding: 9px 14px;
}

main {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

section {
  padding: 96px 0;
}

.section-grid,
.split-section {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  gap: 44px;
  align-items: center;
}

.hero {
  min-height: calc(100vh - 72px);
  padding-top: 82px;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 820px;
  margin-bottom: 24px;
  font-size: clamp(3rem, 8vw, 6.8rem);
  line-height: 0.94;
  letter-spacing: -0.085em;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(2rem, 4vw, 4.2rem);
  line-height: 1;
  letter-spacing: -0.07em;
}

h3 {
  margin-bottom: 10px;
  font-size: 1.12rem;
  letter-spacing: -0.03em;
}

.hero-lead,
.wide-copy p,
.split-section p,
.cta p {
  color: var(--muted);
  font-size: 1.08rem;
}

.hero-lead {
  max-width: 720px;
  margin-bottom: 34px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  border: 1px solid var(--surface-strong);
  border-radius: 999px;
  font-weight: 800;
  padding: 0 20px;
}

.button.primary {
  background: var(--surface-strong);
  color: #fffdf8;
}

.button.secondary {
  background: transparent;
}

.button:hover {
  transform: translateY(-1px);
}

.hero-card {
  position: relative;
  overflow: hidden;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 253, 248, 0.86);
  box-shadow: var(--shadow);
}

.hero-card::before {
  position: absolute;
  inset: auto -30% -45% -30%;
  height: 260px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.24), rgba(15, 143, 112, 0.16));
  content: "";
  filter: blur(10px);
}

.signal {
  display: flex;
  gap: 8px;
  margin-bottom: 90px;
}

.signal span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--surface-strong);
}

.signal span:nth-child(2) {
  background: var(--accent);
}

.signal span:nth-child(3) {
  background: var(--green);
}

.hero-card h2 {
  position: relative;
  margin-bottom: 10px;
  font-size: clamp(2rem, 4vw, 3.4rem);
}

.hero-card p,
.hero-card dl {
  position: relative;
}

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

.hero-card dl {
  display: grid;
  gap: 14px;
  margin: 28px 0 0;
}

.hero-card dl div {
  padding-top: 14px;
  border-top: 1px solid rgba(17, 17, 17, 0.12);
}

.hero-card dt {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.hero-card dd {
  margin: 4px 0 0;
  font-weight: 700;
}

.intro {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.wide-copy {
  max-width: 980px;
}

.wide-copy p {
  max-width: 860px;
}

.section-heading {
  max-width: 820px;
  margin-bottom: 38px;
}

.card-grid,
.protocol-grid,
.use-case-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.info-card,
.protocol-grid article,
.use-case-grid article,
.layer-list article,
.faq details {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 253, 248, 0.72);
}

.info-card {
  min-height: 310px;
  padding: 24px;
}

.card-number {
  display: inline-flex;
  margin-bottom: 84px;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.info-card p,
.protocol-grid p,
.use-case-grid p,
.layer-list p,
.faq p,
.site-footer p {
  color: var(--muted);
}

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

.layer-list {
  display: grid;
  gap: 12px;
}

.layer-list article {
  padding: 20px;
}

.layer-list strong {
  display: block;
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}

.layer-list p {
  margin-bottom: 0;
}

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

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

.protocol-grid article,
.use-case-grid article {
  padding: 24px;
}

.roadmap {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.timeline {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.timeline li {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 24px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 253, 248, 0.72);
}

.timeline span {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.timeline p {
  max-width: 790px;
  margin-bottom: 0;
  color: var(--muted);
}

.use-cases {
  display: grid;
  grid-template-columns: 0.76fr 1.24fr;
  gap: 44px;
  align-items: start;
}

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

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

.faq-list {
  display: grid;
  gap: 12px;
}

.faq details {
  padding: 22px 24px;
}

.faq summary {
  cursor: pointer;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.faq summary::marker {
  color: var(--accent);
}

.faq p {
  max-width: 850px;
  margin: 14px 0 0;
}

.cta {
  max-width: 920px;
  margin: 0 auto;
  text-align: center;
}

.cta p {
  max-width: 760px;
  margin: 0 auto 28px;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 34px 0 42px;
  border-top: 1px solid var(--line);
}

.site-footer p {
  margin: 0;
}

@media (max-width: 900px) {
  .site-header {
    align-items: flex-start;
    border-radius: 26px;
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 12px 14px;
  }

  .section-grid,
  .split-section,
  .use-cases {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 72px;
  }

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

@media (max-width: 640px) {
  main,
  .site-header,
  .site-footer {
    width: min(100% - 24px, 1180px);
  }

  section {
    padding: 72px 0;
  }

  h1 {
    font-size: clamp(2.8rem, 17vw, 4.6rem);
  }

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

  .card-grid,
  .protocol-grid,
  .use-case-grid {
    grid-template-columns: 1fr;
  }

  .info-card {
    min-height: auto;
  }

  .card-number {
    margin-bottom: 44px;
  }

  .timeline li {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}