/* =========================================================================
   Sigil — landing styles
   - dark, minimal, holographic accents matching the logo's OKLCH gradient
   - one file, no preprocessor; readable top to bottom
   ========================================================================= */

:root {
  --bg: #0a0a10;
  --bg-elev: #11111a;
  --bg-soft: #16161f;
  --line: #23232f;
  --line-soft: #1a1a25;
  --fg: #e8e8f0;
  --fg-dim: #a0a0b0;
  --fg-muted: #6e6e80;

  --accent-violet: oklch(72% 0.24 290);
  --accent-blue:   oklch(78% 0.20 240);
  --accent-cyan:   oklch(84% 0.18 190);
  --accent-green:  oklch(88% 0.20 130);
  --accent-amber:  oklch(78% 0.22 45);

  --grad: linear-gradient(135deg,
    var(--accent-violet) 0%,
    var(--accent-blue)   30%,
    var(--accent-cyan)   55%,
    var(--accent-green)  80%,
    var(--accent-amber)  100%);

  --radius: 14px;
  --radius-sm: 8px;
  --max-w: 1080px;

  --font-sans: 'Inter var', 'Inter', -apple-system, BlinkMacSystemFont,
               'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'JetBrains Mono', 'Berkeley Mono', ui-monospace, SFMono-Regular,
               Menlo, Monaco, Consolas, monospace;
}

* { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-feature-settings: 'cv11', 'ss01', 'ss03';
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

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

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.1em 0.4em;
  background: var(--bg-elev);
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  color: var(--fg);
}

::selection {
  background: oklch(78% 0.20 240 / 0.4);
  color: #fff;
}

/* ---- Background grid -------------------------------------------------- */

.grid-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at top, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at top, black 30%, transparent 75%);
  pointer-events: none;
}

/* ---- Nav -------------------------------------------------------------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 24px;
  max-width: var(--max-w);
  margin: 0 auto;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: -0.01em;
  font-size: 1.05rem;
}
.brand img { width: 28px; height: 28px; }

.nav__links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 0.95rem;
  color: var(--fg-dim);
}
.nav__links a {
  transition: color 120ms ease;
}
.nav__links a:hover { color: var(--fg); }

@media (max-width: 560px) {
  .nav__links a:not(.cta--github) { display: none; }
}

/* ---- Hero ------------------------------------------------------------- */

main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.hero {
  text-align: center;
  padding: 64px 0 96px;
  position: relative;
}

.hero__mark {
  position: relative;
  width: 160px;
  height: 160px;
  margin: 0 auto 32px;
}
.hero__mark img {
  position: relative;
  z-index: 1;
}
.hero__halo {
  position: absolute;
  inset: -40%;
  background: var(--grad);
  filter: blur(60px);
  opacity: 0.45;
  z-index: 0;
  border-radius: 50%;
  animation: float 8s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); opacity: 0.45; }
  50% { transform: translateY(-6px) scale(1.05); opacity: 0.55; }
}
@media (prefers-reduced-motion: reduce) {
  .hero__halo { animation: none; }
}

.hero__title {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: -0.035em;
  font-weight: 600;
  margin: 0 0 20px;
}

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__lede {
  max-width: 620px;
  margin: 0 auto 36px;
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  color: var(--fg-dim);
  line-height: 1.6;
}

.hero__note {
  margin-top: 28px;
  font-size: 0.85rem;
  color: var(--fg-muted);
  font-family: var(--font-mono);
}
.hero__note a {
  color: var(--fg-dim);
  border-bottom: 1px dashed var(--line);
  transition: color 120ms, border-color 120ms;
}
.hero__note a:hover { color: var(--fg); border-bottom-color: var(--fg-dim); }

/* ---- CTA buttons ------------------------------------------------------ */

.cta-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin: 0 auto;
}
.cta-row--secondary {
  margin-top: 18px;
}

.store {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 22px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--fg);
  font-weight: 500;
  transition: transform 120ms ease, border-color 160ms ease, background 160ms ease;
  position: relative;
}
.store:hover {
  transform: translateY(-1px);
  border-color: transparent;
  background:
    linear-gradient(var(--bg-elev), var(--bg-elev)) padding-box,
    var(--grad) border-box;
  border: 1px solid transparent;
}
.store__label {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.1;
}
.store__small {
  font-size: 0.7rem;
  color: var(--fg-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.store__big {
  font-size: 1rem;
  letter-spacing: -0.01em;
  font-weight: 600;
}

.cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  font-size: 0.9rem;
  color: var(--fg-dim);
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  transition: color 120ms, border-color 120ms, background 120ms;
}
.cta:hover {
  color: var(--fg);
  border-color: var(--line);
  background: var(--bg-elev);
}

/* ---- Sections --------------------------------------------------------- */

.section {
  padding: 88px 0;
  border-top: 1px solid var(--line-soft);
}
.section h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  letter-spacing: -0.025em;
  font-weight: 600;
  margin: 0 0 16px;
  text-align: center;
}
.section__lede {
  text-align: center;
  max-width: 560px;
  margin: 0 auto 48px;
  color: var(--fg-dim);
  font-size: 1.05rem;
}

/* ---- Steps ------------------------------------------------------------ */

.steps {
  list-style: none;
  padding: 0;
  margin: 56px 0 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
@media (max-width: 760px) {
  .steps { grid-template-columns: 1fr; }
}
.steps li {
  background: var(--bg-elev);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color 200ms, transform 200ms;
}
.steps li:hover {
  border-color: var(--line);
  transform: translateY(-2px);
}
.step__num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: transparent;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  letter-spacing: 0.08em;
}
.steps h3 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 12px 0 8px;
}
.steps p {
  color: var(--fg-dim);
  font-size: 0.95rem;
  margin: 0;
  line-height: 1.55;
}

/* ---- Audiences section ------------------------------------------------ */

.section--audiences {
  background:
    radial-gradient(ellipse at 50% 0%, rgba(120, 200, 140, 0.04), transparent 60%);
}

.audiences {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  max-width: 920px;
  margin: 0 auto;
}
@media (max-width: 760px) {
  .audiences { grid-template-columns: 1fr; }
}

.audience {
  background: var(--bg-elev);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 30px 28px;
  transition: border-color 200ms, transform 200ms;
}
.audience:hover {
  border-color: var(--line);
  transform: translateY(-2px);
}
.audience__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 1rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 700;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 22px;
  padding: 0;
  border: 0;
}
.audience h3 {
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
}
.audience p {
  margin: 0 0 16px;
  color: var(--fg-dim);
  font-size: 0.97rem;
  line-height: 1.6;
}
.audience p code,
.audience__list code {
  background: var(--bg-soft);
  border-color: var(--line-soft);
  color: var(--fg);
}
.audience__list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.audience__list li {
  padding: 10px 0 10px 22px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--fg-dim);
  font-size: 0.92rem;
  line-height: 1.55;
  position: relative;
}
.audience__list li::before {
  content: '›';
  position: absolute;
  left: 0;
  top: 10px;
  color: transparent;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  font-family: var(--font-mono);
  font-weight: 700;
}
.audience__list li:last-child { border-bottom: 0; }

/* ---- Privacy section -------------------------------------------------- */

.section--privacy {
  background:
    radial-gradient(ellipse at 50% 0%, rgba(120, 80, 220, 0.06), transparent 60%);
}

.onchain {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin: 0 auto;
  max-width: 880px;
}
@media (max-width: 720px) {
  .onchain { grid-template-columns: 1fr; }
}
.onchain__col {
  background: var(--bg-elev);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 28px 24px;
}
.onchain__col h4 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 16px;
  color: var(--fg-muted);
  font-weight: 600;
}
.onchain__col--yes h4::before {
  content: '✓ ';
  color: var(--accent-green);
}
.onchain__col--no h4::before {
  content: '✗ ';
  color: var(--accent-amber);
}
.onchain__col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.onchain__col li {
  padding: 10px 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--fg-dim);
  font-size: 0.95rem;
}
.onchain__col li:last-child { border-bottom: 0; }

.tradeoff {
  max-width: 720px;
  margin: 56px auto 0;
  padding: 28px 28px;
  background: var(--bg-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  position: relative;
}
.tradeoff::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--radius);
  padding: 1px;
  background: var(--grad);
  -webkit-mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  opacity: 0.5;
  pointer-events: none;
}
.tradeoff h3 {
  font-size: 1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0 0 12px;
  color: var(--fg);
}
.tradeoff p {
  margin: 0;
  color: var(--fg-dim);
  line-height: 1.65;
  font-size: 0.97rem;
}

/* ---- Protocols section ------------------------------------------------ */

.section--protocols {
  background:
    radial-gradient(ellipse at 50% 0%, rgba(80, 200, 220, 0.06), transparent 60%);
}

.pillars {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  max-width: 880px;
  margin: 0 auto;
}
@media (max-width: 720px) {
  .pillars { grid-template-columns: 1fr; }
}
.pillar {
  background: var(--bg-elev);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 28px 26px;
  transition: border-color 200ms, transform 200ms;
}
.pillar:hover {
  border-color: var(--line);
  transform: translateY(-2px);
}
.pillar__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--bg-soft);
  border: 1px solid var(--line-soft);
  color: var(--fg-dim);
  margin-bottom: 14px;
}
.pillar h3 {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
}
.pillar p {
  margin: 0;
  color: var(--fg-dim);
  font-size: 0.95rem;
  line-height: 1.6;
}
.pillar p code {
  background: var(--bg-soft);
  border-color: var(--line-soft);
  color: var(--fg);
}

/* code snippet */

.snippet {
  max-width: 760px;
  margin: 40px auto 0;
  background: var(--bg-elev);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}
.snippet__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line-soft);
  background: var(--bg-soft);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}
.snippet__lang {
  color: transparent;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  letter-spacing: 0.06em;
}
.snippet__caption {
  color: var(--fg-muted);
}
.snippet pre {
  margin: 0;
  padding: 22px 22px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--fg);
}
.snippet pre code {
  background: transparent;
  border: 0;
  padding: 0;
  font-size: inherit;
  color: inherit;
}
.hl-kw  { color: oklch(78% 0.20 290); }
.hl-typ { color: oklch(82% 0.16 200); }
.hl-com { color: var(--fg-muted); font-style: italic; }

/* use-cases grid */

.usecases__title {
  text-align: center;
  margin: 64px 0 24px;
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-muted);
  font-weight: 600;
}

.usecases {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  max-width: 880px;
  margin: 0 auto;
}
@media (max-width: 720px) {
  .usecases { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .usecases { grid-template-columns: 1fr; }
}
.usecase {
  background: var(--bg-elev);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 20px 20px;
  transition: border-color 160ms, transform 160ms;
}
.usecase:hover {
  border-color: var(--line);
  transform: translateY(-1px);
}
.usecase__icon {
  display: inline-block;
  font-size: 1.2rem;
  font-family: var(--font-mono);
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 8px;
}
.usecase h4 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.usecase p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--fg-dim);
  line-height: 1.5;
}

.protocols__note {
  max-width: 720px;
  margin: 56px auto 0;
  text-align: center;
  color: var(--fg-muted);
  font-size: 0.92rem;
  line-height: 1.6;
}
.protocols__note code {
  font-size: 0.85rem;
}

/* ---- About section ---------------------------------------------------- */

.section--about {
  background:
    radial-gradient(ellipse at 50% 0%, rgba(220, 180, 100, 0.04), transparent 60%);
}

.about {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.about__row {
  background: var(--bg-elev);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 24px 26px;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  align-items: start;
  transition: border-color 200ms;
}
.about__row:hover { border-color: var(--line); }
@media (max-width: 720px) {
  .about__row {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}
.about__row h3 {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: transparent;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  font-weight: 600;
  padding-top: 4px;
}
.about__row p {
  margin: 0;
  color: var(--fg-dim);
  font-size: 0.97rem;
  line-height: 1.65;
}
.about__row p a {
  color: var(--fg);
  border-bottom: 1px dashed var(--line);
  transition: color 120ms, border-color 120ms;
}
.about__row p a:hover {
  border-bottom-color: var(--fg-dim);
}

/* ---- Bottom CTA ------------------------------------------------------- */

.section--cta {
  text-align: center;
  border-bottom: 1px solid var(--line-soft);
}
.section--cta .cta-row { margin-top: 36px; }

/* ---- Footer ----------------------------------------------------------- */

.footer {
  padding: 48px 24px 64px;
  color: var(--fg-muted);
  font-size: 0.85rem;
}
.footer__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--fg-dim);
  font-weight: 500;
}
.footer__links {
  display: flex;
  gap: 22px;
}
.footer__links a {
  transition: color 120ms;
}
.footer__links a:hover { color: var(--fg); }
.footer__small {
  margin: 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

/* ---- Focus styles (accessibility) ------------------------------------- */

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}