/* FORGE — design system
 * Fintech-strict (Inter) meets cypherpunk graffiti (Rubik Spray Paint).
 * Light theme. Bitcoin orange + toxic lime. AGPL-3.0.
 */

:root {
  /* surfaces */
  --bg: #faf9f6;
  --bg-alt: #f1f0ea;
  --bg-card: #ffffff;
  --line: #e4e3db;
  --line-strong: #d2d1c7;

  /* ink */
  --ink: #0b0b0c;
  --ink-2: #3b3b3f;
  --ink-soft: #6c6c72;
  --ink-faint: #9a9aa0;

  /* brand */
  --btc: #f7931a;        /* canonical bitcoin orange */
  --btc-deep: #d97a06;
  --lime: #c4f000;       /* toxic lime */
  --lime-deep: #9bbf00;

  /* gradients */
  --grad-head: linear-gradient(176deg, #0b0b0c 0%, #5c5c61 78%, #8a8a90 100%);
  --grad-btc: linear-gradient(135deg, #f7931a 0%, #ffb347 100%);
  --grad-lime: linear-gradient(135deg, #c4f000 0%, #e7ff7a 100%);

  /* type */
  --sans: "Inter", "Inter Tight", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --graf: "Permanent Marker", "Comic Sans MS", cursive;

  /* metrics */
  --maxw: 1120px;
  --radius: 14px;
  --radius-sm: 9px;
  --gap: clamp(1rem, 3vw, 2rem);
  --pad-section: clamp(4.5rem, 9vw, 8rem);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  font-size: 17px;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* subtle paper grain via radial dots */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(11,11,12,0.035) 1px, transparent 0);
  background-size: 26px 26px;
  mask-image: linear-gradient(180deg, transparent, #000 18%, #000 82%, transparent);
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(1.1rem, 4vw, 2rem); position: relative; z-index: 1; }

/* ---------- type scale ---------- */
h1, h2, h3 { line-height: 1.02; letter-spacing: -0.03em; font-weight: 720; }
.h-grad {
  background: var(--grad-head);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.graf {
  font-family: var(--graf);
  font-weight: 400;
  letter-spacing: 0.01em;
  -webkit-text-fill-color: initial;
}
.mono { font-family: var(--mono); font-feature-settings: "ss01"; }
.kicker {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-soft);
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
}
.kicker::before { content: ""; width: 22px; height: 2px; background: var(--btc); border-radius: 2px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.55em;
  font-weight: 600; font-size: 0.96rem; letter-spacing: -0.01em;
  padding: 0.78em 1.3em; border-radius: 100px; border: 1px solid transparent;
  cursor: pointer; transition: transform .14s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { box-shadow: 0 10px 30px -10px rgba(11,11,12,.5); transform: translateY(-1px); }
.btn-btc { background: var(--grad-btc); color: #1a1102; }
.btn-btc:hover { box-shadow: 0 10px 30px -8px rgba(247,147,26,.55); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn-ghost:hover { border-color: var(--ink); }

/* ---------- nav ---------- */
header.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(150%) blur(12px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, background .25s ease;
}
header.nav.scrolled { border-bottom-color: var(--line); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.brand { display: inline-flex; align-items: center; gap: 0.6em; font-weight: 800; letter-spacing: -0.04em; font-size: 1.18rem; }
.brand .spark { width: 16px; height: 16px; border-radius: 4px; background: var(--grad-btc); box-shadow: 0 0 0 4px color-mix(in srgb, var(--btc) 18%, transparent); }
.nav-links { display: flex; align-items: center; gap: 1.7rem; }
.nav-links a { font-size: 0.92rem; color: var(--ink-2); font-weight: 500; }
.nav-links a:hover { color: var(--ink); }
.nav-cta { display: flex; align-items: center; gap: 0.7rem; }
.nav-toggle { display: none; background: none; border: 1px solid var(--line-strong); border-radius: 9px; width: 40px; height: 40px; cursor: pointer; }
.nav-toggle span { display: block; width: 17px; height: 2px; background: var(--ink); margin: 3px auto; border-radius: 2px; }

/* ---------- hero ---------- */
.hero { padding: clamp(3.5rem, 8vw, 7rem) 0 clamp(3rem, 6vw, 5rem); position: relative; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.6em;
  font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.04em;
  padding: 0.4em 0.85em; border: 1px solid var(--line-strong); border-radius: 100px;
  background: var(--bg-card); color: var(--ink-2); margin-bottom: 1.6rem;
}
.hero-badge b { color: var(--btc-deep); }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--lime-deep); box-shadow: 0 0 0 3px color-mix(in srgb, var(--lime) 30%, transparent); }
.hero h1 { font-size: clamp(2.7rem, 7.2vw, 5.4rem); font-weight: 760; max-width: 14ch; }
.hero h1 .stamp { display: inline-block; transform: rotate(-3deg); color: var(--btc); }
.hero p.lead { font-size: clamp(1.05rem, 2.2vw, 1.32rem); color: var(--ink-2); max-width: 56ch; margin-top: 1.6rem; line-height: 1.5; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 2.3rem; align-items: center; }
.hero-note { font-size: 0.84rem; color: var(--ink-soft); display: flex; align-items: center; gap: 0.5em; }

.id-card {
  margin-top: 3.2rem; max-width: 560px;
  background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.1rem 1.2rem; box-shadow: 0 24px 60px -34px rgba(11,11,12,.35);
}
.id-row { display: flex; align-items: center; gap: 0.8rem; }
.id-avatar { width: 42px; height: 42px; border-radius: 10px; background: var(--grad-lime); flex: none; position: relative; overflow: hidden; }
.id-avatar::after { content: ""; position: absolute; inset: 0; background: radial-gradient(120% 120% at 20% 10%, transparent 40%, rgba(0,0,0,.18)); }
.id-meta { min-width: 0; }
.id-name { font-weight: 700; letter-spacing: -0.02em; }
.id-key { font-family: var(--mono); font-size: 0.78rem; color: var(--ink-soft); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.id-stats { display: flex; gap: 1.4rem; margin-top: 1rem; padding-top: 0.9rem; border-top: 1px dashed var(--line-strong); }
.id-stat b { display: block; font-size: 1.15rem; letter-spacing: -0.03em; }
.id-stat span { font-size: 0.72rem; color: var(--ink-soft); font-family: var(--mono); text-transform: uppercase; letter-spacing: 0.08em; }

/* ---------- generic section ---------- */
section { padding: var(--pad-section) 0; position: relative; }
.section-head { max-width: 64ch; margin-bottom: clamp(2.2rem, 5vw, 3.5rem); }
.section-head h2 { font-size: clamp(1.9rem, 4.6vw, 3.1rem); margin-top: 0.9rem; }
.section-head p { color: var(--ink-2); margin-top: 1rem; font-size: 1.08rem; max-width: 58ch; }

/* principles strip */
.strip { background: var(--ink); color: #fff; border-radius: var(--radius); padding: clamp(1.4rem,3vw,2rem); display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; overflow: hidden; }
.strip .cell { padding: 0.4rem clamp(0.6rem,2vw,1.4rem); }
.strip .cell h3 { font-size: 1.02rem; color: #fff; display: flex; align-items: center; gap: 0.5em; }
.strip .cell h3 .pip { width: 8px; height: 8px; border-radius: 2px; }
.strip .cell p { font-size: 0.88rem; color: #b7b7bd; margin-top: 0.5rem; }

/* feature grid */
.grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: var(--gap); }
.card {
  background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: clamp(1.3rem, 2.6vw, 1.9rem); transition: transform .2s ease, box-shadow .25s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 22px 50px -32px rgba(11,11,12,.4); border-color: var(--line-strong); }
.card .num { font-family: var(--mono); font-size: 0.78rem; color: var(--btc-deep); letter-spacing: 0.1em; }
.card h3 { font-size: 1.28rem; margin: 0.7rem 0 0.55rem; }
.card p { color: var(--ink-2); font-size: 0.98rem; }
.card .ico { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; margin-bottom: 1rem; background: var(--bg-alt); }
.col-6 { grid-column: span 6; }
.col-4 { grid-column: span 4; }
.col-3 { grid-column: span 3; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

/* escrow / flow diagram */
.flow { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: var(--gap); align-items: stretch; }
.node {
  background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.3rem; text-align: center; position: relative;
}
.node .role { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-soft); }
.node .sig { font-size: 2rem; font-weight: 800; letter-spacing: -0.04em; margin: 0.5rem 0; }
.node.escrow { border: 2px solid var(--btc); background: linear-gradient(180deg, #fff, #fff7ec); }
.flow-caption { text-align: center; margin-top: 1.6rem; font-family: var(--mono); font-size: 0.82rem; color: var(--ink-soft); }

/* thin-line callout */
.callout {
  border-radius: var(--radius); padding: clamp(1.6rem,4vw,3rem);
  background: linear-gradient(140deg, #11110f 0%, #1c1b17 100%); color: #f4f3ee;
  border: 1px solid #2a291f;
}
.callout .kicker { color: #c9c8bf; }
.callout .kicker::before { background: var(--lime); }
.callout h2 { font-size: clamp(1.8rem,4.4vw,2.8rem); margin: 0.9rem 0 1rem; color: #fff; }
.callout p { color: #c4c3ba; max-width: 62ch; }
.balance { display: grid; grid-template-columns: 1fr 1fr; gap: var(--gap); margin-top: 2rem; }
.balance .b { background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.09); border-radius: var(--radius-sm); padding: 1.2rem; }
.balance .b h4 { font-size: 0.78rem; font-family: var(--mono); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 0.7rem; }
.balance .b.free h4 { color: var(--lime); }
.balance .b.safe h4 { color: var(--btc); }
.balance .b ul { list-style: none; display: grid; gap: 0.55rem; }
.balance .b li { font-size: 0.92rem; color: #cfceC5; padding-left: 1.3em; position: relative; }
.balance .b li::before { content: "›"; position: absolute; left: 0; color: var(--ink-faint); }

/* roadmap */
.phases { display: grid; gap: 0; }
.phase { display: grid; grid-template-columns: 130px 1fr; gap: clamp(1rem,3vw,2.4rem); padding: 1.5rem 0; border-top: 1px solid var(--line); }
.phase:first-child { border-top: none; }
.phase .when { font-family: var(--mono); font-size: 0.82rem; color: var(--btc-deep); letter-spacing: 0.04em; }
.phase .when small { display: block; color: var(--ink-faint); margin-top: 0.2rem; }
.phase h3 { font-size: 1.2rem; margin-bottom: 0.4rem; }
.phase p { color: var(--ink-2); font-size: 0.96rem; max-width: 60ch; }

/* donate */
.donate { background: var(--bg-alt); border-radius: var(--radius); padding: clamp(1.8rem,4vw,3rem); }
.addr { display: flex; align-items: center; gap: 0.7rem; background: var(--bg-card); border: 1px solid var(--line); border-radius: 100px; padding: 0.5rem 0.5rem 0.5rem 1.1rem; max-width: 560px; }
.addr code { font-family: var(--mono); font-size: 0.85rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; color: var(--ink-2); }
.copy-btn { border: none; background: var(--ink); color: #fff; border-radius: 100px; padding: 0.5em 1em; font-size: 0.82rem; cursor: pointer; font-weight: 600; }
.copy-btn.ok { background: var(--lime-deep); color: #0b0b0c; }

/* footer */
footer { border-top: 1px solid var(--line); padding: clamp(3rem,6vw,4.5rem) 0 3rem; }
.foot-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: var(--gap); }
.foot-grid h5 { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-soft); margin-bottom: 1rem; }
.foot-grid a { display: block; color: var(--ink-2); font-size: 0.92rem; padding: 0.28rem 0; }
.foot-grid a:hover { color: var(--ink); }
.foot-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; margin-top: 2.8rem; padding-top: 1.6rem; border-top: 1px solid var(--line); font-size: 0.82rem; color: var(--ink-soft); }
.foot-bottom .mono { font-size: 0.78rem; }
.pgp { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-faint); word-break: break-all; }

/* reveal animation */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s cubic-bezier(.2,.7,.3,1), transform .6s cubic-bezier(.2,.7,.3,1); }
.reveal.in { opacity: 1; transform: none; }

/* whitepaper page */
.paper { max-width: 760px; margin: 0 auto; padding: clamp(2rem,5vw,4rem) 0 5rem; }
.paper h1 { font-size: clamp(2.1rem,5vw,3.2rem); margin-bottom: 0.5rem; }
.paper .sub { color: var(--ink-soft); font-family: var(--mono); font-size: 0.85rem; margin-bottom: 2.5rem; }
.paper h2 { font-size: 1.6rem; margin: 2.6rem 0 0.9rem; padding-top: 1.4rem; border-top: 1px solid var(--line); letter-spacing: -0.02em; }
.paper h3 { font-size: 1.18rem; margin: 1.8rem 0 0.6rem; }
.paper p, .paper li { color: var(--ink-2); font-size: 1.02rem; line-height: 1.7; }
.paper p { margin-bottom: 1rem; }
.paper ul, .paper ol { margin: 0 0 1.2rem 1.3rem; display: grid; gap: 0.5rem; }
.paper code { font-family: var(--mono); background: var(--bg-alt); padding: 0.1em 0.4em; border-radius: 5px; font-size: 0.88em; }
.paper blockquote { border-left: 3px solid var(--btc); padding: 0.4rem 0 0.4rem 1.2rem; margin: 1.5rem 0; color: var(--ink); font-style: italic; }
.paper .toc { background: var(--bg-alt); border-radius: var(--radius); padding: 1.4rem 1.6rem; margin-bottom: 2.5rem; }
.paper .toc h4 { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-soft); margin-bottom: 0.8rem; }
.paper .toc a { color: var(--ink-2); display: block; padding: 0.2rem 0; font-size: 0.95rem; }
.paper .toc a:hover { color: var(--btc-deep); }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .grid .col-6, .grid .col-4, .grid .col-3, .grid .col-8 { grid-column: span 6; }
  .strip { grid-template-columns: 1fr 1fr; gap: 1.2rem; }
  .flow { grid-template-columns: 1fr; }
  .balance { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .nav-links, .nav-cta .btn-ghost { display: none; }
  .nav-toggle { display: block; }
  .nav-links.open { display: flex; position: absolute; top: 66px; left: 0; right: 0; flex-direction: column; align-items: flex-start; gap: 0.2rem; background: var(--bg); border-bottom: 1px solid var(--line); padding: 1rem 1.4rem 1.4rem; }
  .nav-links.open a { padding: 0.6rem 0; width: 100%; border-bottom: 1px solid var(--line); }
  .grid .col-6, .grid .col-4, .grid .col-3, .grid .col-8, .grid .col-12 { grid-column: span 12; }
  .strip { grid-template-columns: 1fr; }
  .phase { grid-template-columns: 1fr; gap: 0.4rem; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
  .reveal { transition: none; opacity: 1; transform: none; }
}