:root {
  --ink: #16202b;
  --paper: #ffffff;
  --paper-dim: #f2f4f6;
  --amber: #f2a007;
  --amber-deep: #d18a00;
  --line: #dfe4e9;
  --mono: "IBM Plex Mono", monospace;
  --body: "Inter", system-ui, sans-serif;
  --display: "Archivo", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  font-family: var(--body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}

h1, h2, h3 {
  font-family: var(--display);
  font-stretch: 75%;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  line-height: 1.05;
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: rgba(242, 160, 7, 0.14);
  padding: 0.05em 0.35em;
  border-radius: 3px;
}

.amber { color: var(--amber); }

/* NAV */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: var(--paper);
  border-bottom: 2px solid var(--ink);
}
.nav-inner {
  max-width: 1060px; margin: 0 auto; padding: 0.8rem 1.2rem;
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
}
.logo {
  font-family: var(--display); font-stretch: 75%; font-weight: 900;
  font-size: 1.25rem; letter-spacing: 0.03em;
}
.logo-amber { color: var(--amber); }
.nav-links { display: flex; gap: 1.4rem; align-items: center; flex-wrap: wrap; }
.nav-links a { color: var(--ink); text-decoration: none; font-size: 0.92rem; font-weight: 500; }
.nav-links a:hover { color: var(--amber-deep); }
.nav-cta {
  background: var(--ink); color: var(--paper) !important;
  padding: 0.4rem 0.9rem; border-radius: 4px;
}
.nav-cta:hover { background: var(--amber-deep); }

/* HERO */
.hero { border-bottom: 2px solid var(--ink); }
.hero-inner { max-width: 1060px; margin: 0 auto; padding: 4.5rem 1.2rem 4rem; }
.eyebrow {
  font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--amber-deep); margin-bottom: 1rem;
}
.hero h1 { font-size: clamp(2.4rem, 6vw, 4.4rem); max-width: 18ch; }
.hero h1 em { font-style: normal; color: var(--amber); }
.hero-sub { max-width: 56ch; margin: 1.4rem 0 2rem; font-size: 1.08rem; color: #3b4754; }
.hero-actions { display: flex; gap: 0.9rem; flex-wrap: wrap; }

.btn {
  display: inline-block; text-decoration: none; font-weight: 600;
  padding: 0.75rem 1.5rem; border-radius: 5px; font-size: 0.98rem;
  border: 2px solid var(--ink); transition: transform 0.12s ease, background 0.12s ease;
}
.btn:focus-visible { outline: 3px solid var(--amber); outline-offset: 2px; }
.btn-primary { background: var(--amber); color: var(--ink); border-color: var(--ink); }
.btn-primary:hover { background: var(--amber-deep); transform: translateY(-2px); }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--paper-dim); }
.btn-big { font-size: 1.1rem; padding: 0.9rem 2rem; }

/* RECEIPT (signature) */
.receipt {
  margin-top: 3.2rem; max-width: 460px;
  background: var(--paper);
  font-family: var(--mono); font-size: 0.82rem;
  border: 1px solid var(--line);
  box-shadow: 0 10px 30px rgba(22, 32, 43, 0.12);
  padding: 1.1rem 1.2rem 0.9rem;
  position: relative;
}
.receipt::before, .receipt::after {
  content: ""; position: absolute; left: 0; right: 0; height: 8px;
  background:
    radial-gradient(circle at 6px 0, transparent 5px, var(--paper) 5px) repeat-x;
  background-size: 14px 8px;
}
.receipt::before { top: -8px; transform: scaleY(-1); filter: drop-shadow(0 -1px 0 var(--line)); }
.receipt::after { bottom: -8px; filter: drop-shadow(0 1px 0 var(--line)); }
.receipt-head {
  display: flex; justify-content: space-between;
  font-weight: 600; letter-spacing: 0.08em;
  border-bottom: 1px dashed var(--line); padding-bottom: 0.5rem; margin-bottom: 0.5rem;
}
.receipt-row { display: flex; justify-content: space-between; padding: 0.14rem 0; }
.receipt-row.sub { color: #6b7683; font-size: 0.78rem; }
.receipt-row.total { font-weight: 600; color: var(--amber-deep); }
.receipt-divider { border-top: 1px dashed var(--line); margin: 0.45rem 0; }
.receipt-foot {
  margin-top: 0.7rem; padding-top: 0.5rem; border-top: 1px dashed var(--line);
  text-align: center; color: #6b7683; font-size: 0.74rem; letter-spacing: 0.06em;
}

/* BANDS */
.band { padding: 4.2rem 0; }
.band-inner { max-width: 1060px; margin: 0 auto; padding: 0 1.2rem; }
.band h2 { font-size: clamp(1.7rem, 3.5vw, 2.5rem); margin-bottom: 2rem; }
.band-ink { background: var(--ink); color: var(--paper); }
.band-ink h2 { color: var(--paper); }
.band-paper { background: var(--paper-dim); }
.muted { color: #5b6773; margin-top: -1.4rem; margin-bottom: 1.6rem; }
.band-ink .muted { color: #9aa7b4; }

/* TRICK */
.trick-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.1rem; }
.trick-card {
  border: 1px solid rgba(255,255,255,0.18); border-radius: 6px; padding: 1.3rem;
  background: rgba(255,255,255,0.04);
}
.trick-card h3 { font-size: 1.05rem; margin-bottom: 0.5rem; color: var(--amber); }
.trick-card p { font-size: 0.95rem; color: #c8d1da; }

/* STEPS */
.steps { list-style: none; counter-reset: step; display: grid; gap: 0; }
.steps li {
  counter-increment: step;
  display: grid; grid-template-columns: 130px 1fr; gap: 1.2rem;
  padding: 1.2rem 0; border-top: 1px solid var(--line);
}
.steps li:last-child { border-bottom: 1px solid var(--line); }
.step-k {
  font-family: var(--display); font-stretch: 75%; font-weight: 800;
  text-transform: uppercase; font-size: 1.05rem;
}
.step-k::before {
  content: counter(step, decimal-leading-zero);
  display: block; font-family: var(--mono); font-weight: 500;
  font-size: 0.75rem; color: var(--amber-deep);
}
.steps p { color: #3b4754; }
@media (max-width: 560px) { .steps li { grid-template-columns: 1fr; gap: 0.3rem; } }

/* ARCHITECTURE */
.arch { display: grid; gap: 0.4rem; }
.arch-layer {
  background: var(--paper); border: 2px solid var(--ink); border-radius: 6px;
  padding: 1.2rem 1.4rem;
}
.arch-chain { background: var(--ink); color: var(--paper); }
.arch-chain code { background: rgba(242,160,7,0.25); color: var(--paper); }
.arch-tag {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em;
  color: var(--amber-deep); display: block; margin-bottom: 0.2rem;
}
.arch-chain .arch-tag { color: var(--amber); }
.arch-layer strong { font-family: var(--display); font-stretch: 75%; font-weight: 800; text-transform: uppercase; }
.arch-layer p { font-size: 0.92rem; margin-top: 0.35rem; color: #4a5663; }
.arch-chain p { color: #c8d1da; }
.arch-arrow {
  text-align: center; font-family: var(--mono); font-size: 0.75rem;
  color: #7a8694; letter-spacing: 0.1em; padding: 0.15rem 0;
}

/* CONTRACTS */
.contracts { display: grid; gap: 0.7rem; }
.contract {
  display: grid; grid-template-columns: 180px 1fr auto; gap: 1rem; align-items: center;
  text-decoration: none; color: var(--ink);
  border: 1px solid var(--line); border-radius: 6px; padding: 0.9rem 1.2rem;
  transition: border-color 0.12s ease, transform 0.12s ease;
}
.contract:hover { border-color: var(--amber); transform: translateX(4px); }
.contract-name { font-family: var(--display); font-stretch: 75%; font-weight: 800; text-transform: uppercase; }
.contract-addr { font-family: var(--mono); font-size: 0.82rem; color: #5b6773; word-break: break-all; }
.contract-link { font-size: 0.85rem; font-weight: 600; color: var(--amber-deep); white-space: nowrap; }
@media (max-width: 640px) { .contract { grid-template-columns: 1fr; gap: 0.25rem; } }

/* DOWNLOAD */
.dl { text-align: center; }
.dl p { color: #c8d1da; margin-bottom: 1.4rem; }
.dl-note { font-size: 0.85rem; max-width: 46ch; margin: 1.4rem auto 0; }

/* FOOTER */
.footer {
  border-top: 2px solid var(--ink);
  max-width: 1060px; margin: 0 auto; padding: 1.4rem 1.2rem;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.6rem;
  font-size: 0.88rem; font-family: var(--mono);
}
.footer a { color: var(--amber-deep); text-decoration: none; }
.footer a:hover { text-decoration: underline; }