/* ---------- Tokens ---------- */
:root {
  --bg: oklch(11% 0.006 250);
  --bg-elev: oklch(14% 0.006 250);
  --surface: oklch(16% 0.005 250);
  --border: oklch(26% 0.005 250);
  --border-strong: oklch(38% 0.008 250);

  --text: oklch(96% 0.005 250);
  --text-dim: oklch(72% 0.008 250);
  --text-muted: oklch(50% 0.008 250);

  --silver-1: oklch(96% 0.008 250);
  --silver-2: oklch(78% 0.013 250);
  --silver-3: oklch(58% 0.015 250);

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-display: clamp(2.5rem, 1rem + 6vw, 6rem);
  --text-hero: clamp(3rem, 0.5rem + 9vw, 8rem);

  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;

  --dur: 240ms;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);

  --max-w: 1280px;
  --pad-x: clamp(1rem, 4vw, 3rem);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; }
html, body { height: 100%; }
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 60% at 50% -10%, oklch(22% 0.01 250) 0%, transparent 60%),
    radial-gradient(circle at 90% 30%, oklch(20% 0.015 260 / 0.6) 0%, transparent 50%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.035;
  z-index: 100;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 200'><filter id='n'><feTurbulence baseFrequency='0.9' numOctaves='2'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  mix-blend-mode: overlay;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; transition: color var(--dur) var(--ease); }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ol, ul { list-style: none; padding: 0; }
em { font-style: italic; }

.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  padding: 0.5rem 1rem;
  background: var(--text);
  color: var(--bg);
  border-radius: 6px;
  z-index: 200;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 1rem; }

/* ---------- Type utilities ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.muted { color: var(--text-muted); }

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.15em 0.55em;
  border: 1px solid var(--border-strong);
  border-radius: 100px;
  color: var(--text-dim);
  margin-left: 0.4em;
  vertical-align: 0.1em;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  border-radius: 100px;
  font-weight: 500;
  font-size: var(--text-sm);
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease),
    border-color var(--dur) var(--ease), color var(--dur) var(--ease);
  white-space: nowrap;
}
.btn-sm { padding: 0.625rem 1.1rem; font-size: var(--text-xs); }
.btn-primary {
  background: linear-gradient(180deg, var(--silver-1) 0%, var(--silver-2) 100%);
  color: oklch(15% 0.005 250);
  border-color: var(--silver-2);
  box-shadow:
    inset 0 1px 0 oklch(100% 0 0 / 0.5),
    0 8px 28px -4px oklch(0% 0 0 / 0.5);
}
.btn-primary:hover { transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }
.btn-ghost {
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--silver-2); background: oklch(100% 0 0 / 0.025); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding: 0.875rem var(--pad-x);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  background: oklch(11% 0.006 250 / 0.65);
  border-bottom: 1px solid oklch(100% 0 0 / 0.06);
}
.logo { display: inline-flex; align-items: center; gap: 0.6rem; font-weight: 500; }
.logo-mark {
  width: 34px;
  height: 34px;
  display: block;
  flex: 0 0 auto;
  object-fit: contain;
  border-radius: 4px;
}
.logo-text { font-family: var(--font-display); font-size: 1.05rem; letter-spacing: -0.01em; }
nav[aria-label="Primary"] { display: none; }
@media (min-width: 760px) {
  nav[aria-label="Primary"] {
    display: flex;
    gap: var(--space-8);
    font-size: var(--text-sm);
    color: var(--text-dim);
  }
  nav[aria-label="Primary"] a:hover { color: var(--text); }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: clamp(4rem, 7vw + 2rem, 9rem) var(--pad-x) clamp(3rem, 5vw, 6rem);
}
.hero::after {
  content: '';
  position: absolute;
  top: 10%;
  right: -15%;
  width: 60vmax;
  height: 60vmax;
  background:
    radial-gradient(circle at 50% 50%, oklch(82% 0.018 260 / 0.10) 0%, transparent 55%),
    radial-gradient(circle at 30% 60%, oklch(70% 0.025 230 / 0.08) 0%, transparent 60%);
  filter: blur(30px);
  pointer-events: none;
  z-index: -1;
  animation: drift 24s ease-in-out infinite alternate;
}
@keyframes drift {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(-8%, 4%, 0) scale(1.08); }
}
.hero .eyebrow { margin-bottom: var(--space-6); }
.hero-headline {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-hero);
  line-height: 0.94;
  letter-spacing: -0.035em;
  margin-bottom: var(--space-8);
  background: linear-gradient(180deg, oklch(99% 0.005 250) 30%, oklch(74% 0.015 250) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  max-width: 14ch;
}
.hero-headline em {
  font-weight: 300;
  background: linear-gradient(180deg, oklch(85% 0.025 250) 0%, oklch(60% 0.02 250) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.ticker-glyph {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.42em;
  vertical-align: 0.55em;
  padding: 0.3em 0.6em;
  border: 1px solid oklch(100% 0 0 / 0.22);
  border-radius: 8px;
  letter-spacing: 0.1em;
  font-weight: 500;
  -webkit-text-fill-color: var(--text);
  color: var(--text);
  background: oklch(100% 0 0 / 0.03);
}
.hero-sub {
  font-size: clamp(1rem, 0.92rem + 0.45vw, 1.25rem);
  color: var(--text-dim);
  max-width: 56ch;
  margin-bottom: var(--space-8);
  line-height: 1.5;
}
.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: var(--space-12);
}

.contract-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.4rem 0.4rem 0.4rem 1rem;
  background: oklch(100% 0 0 / 0.025);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  max-width: 100%;
  overflow: hidden;
}
.contract-label {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  font-size: 0.65rem;
  flex: 0 0 auto;
}
.contract-chip code {
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
  flex: 1 1 auto;
}
.copy-btn {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding: 0.45rem 0.8rem;
  border-radius: 100px;
  border: 1px solid var(--border-strong);
  color: var(--text-dim);
  flex: 0 0 auto;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.copy-btn:hover { border-color: var(--silver-2); color: var(--text); background: oklch(100% 0 0 / 0.03); }
.copy-btn .copy-done { display: none; }
.copy-btn.is-copied .copy-default { display: none; }
.copy-btn.is-copied .copy-done { display: inline; color: var(--silver-1); }
.copy-btn.is-copied { border-color: var(--silver-2); }

/* ---------- Ticker ---------- */
.ticker {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  padding: 1rem 0;
  background: oklch(13% 0.005 250);
}
.ticker-track {
  display: flex;
  width: max-content;
  animation: scroll 45s linear infinite;
}
.ticker-row {
  display: flex;
  gap: var(--space-8);
  padding-right: var(--space-8);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
  white-space: nowrap;
  flex: 0 0 auto;
}
@keyframes scroll {
  to { transform: translateX(-50%); }
}

/* ---------- Section heads ---------- */
.section-head {
  max-width: var(--max-w);
  margin: 0 auto clamp(3rem, 4vw, 5rem);
  padding: 0 var(--pad-x);
}
.section-head .eyebrow { margin-bottom: var(--space-4); }
.section-head h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-display);
  line-height: 0.96;
  letter-spacing: -0.035em;
  background: linear-gradient(180deg, var(--text) 30%, oklch(72% 0.012 250) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.section-head h2 em {
  font-weight: 300;
  color: oklch(78% 0.018 250);
  -webkit-text-fill-color: oklch(78% 0.018 250);
}

/* ---------- Mechanism ---------- */
.mechanism { padding: clamp(5rem, 9vw, 10rem) 0; }
.steps {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 var(--pad-x);
  display: flex;
  flex-direction: column;
}
.step {
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: clamp(1rem, 3vw, 3rem);
  align-items: baseline;
  padding: clamp(2rem, 3vw, 3rem) 0;
  border-bottom: 1px solid var(--border);
}
.step:first-child { padding-top: 0; }
.step:last-child { border-bottom: 0; }
.step-num {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  line-height: 1;
  background: linear-gradient(180deg, var(--silver-1), var(--silver-3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.step-body { padding-top: 0.5rem; }
.step h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.5rem, 1.2rem + 1vw, 2.25rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}
.step p {
  color: var(--text-dim);
  max-width: 60ch;
  font-size: var(--text-lg);
  line-height: 1.5;
}

/* ---------- Backing ---------- */
.backing {
  padding: clamp(5rem, 9vw, 10rem) 0;
  background: oklch(13% 0.006 250);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.backing-grid {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2.5rem, 5vw, 5rem);
  align-items: center;
}
@media (min-width: 900px) {
  .backing-grid { grid-template-columns: 1.05fr 1fr; }
}

.silver-stock-card {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: oklch(14% 0.006 250);
  box-shadow: 0 30px 60px -30px oklch(0% 0 0 / 0.6);
}
.stock-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-4);
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.stock-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}
.stock-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.4rem, 1.1rem + 0.6vw, 1.75rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--text);
}
.stock-meta {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.stock-meta::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: oklch(70% 0.18 150);
  box-shadow: 0 0 10px oklch(70% 0.18 150 / 0.55);
}
.stock-foot {
  font-size: var(--text-sm);
  color: var(--text-dim);
  line-height: 1.55;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}
.tradingview-widget-container { width: 100%; }

.bar-card { perspective: 1200px; }
.bar-card-inner {
  aspect-ratio: 7 / 4;
  border-radius: 14px;
  padding: clamp(1.25rem, 3vw, 2.25rem);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background:
    linear-gradient(135deg,
      oklch(94% 0.005 250) 0%,
      oklch(82% 0.012 250) 30%,
      oklch(70% 0.014 250) 55%,
      oklch(82% 0.012 250) 75%,
      oklch(60% 0.015 250) 100%);
  color: oklch(20% 0.005 250);
  box-shadow:
    inset 0 1px 0 oklch(100% 0 0 / 0.65),
    inset 0 -2px 8px oklch(0% 0 0 / 0.18),
    inset 0 0 0 1px oklch(100% 0 0 / 0.18),
    0 30px 70px -20px oklch(0% 0 0 / 0.7),
    0 8px 20px -8px oklch(0% 0 0 / 0.4);
  font-family: var(--font-mono);
  letter-spacing: 0.14em;
  position: relative;
  overflow: hidden;
  transform: rotate(-1.6deg);
  transition: transform var(--dur) var(--ease);
}
.bar-card:hover .bar-card-inner { transform: rotate(-0.6deg) translateY(-4px); }
.bar-card-inner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 35%, oklch(100% 0 0 / 0.28) 50%, transparent 65%);
  pointer-events: none;
}
.bar-card-inner::after {
  content: '';
  position: absolute;
  inset: 8px;
  border: 1px solid oklch(0% 0 0 / 0.08);
  border-radius: 8px;
  pointer-events: none;
}
.bar-top, .bar-bottom {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  position: relative;
}
.bar-stamp { font-size: 0.75rem; font-weight: 600; }
.bar-mint { font-size: 0.65rem; color: oklch(30% 0.005 250); }
.bar-weight {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(2.75rem, 6vw, 5rem);
  font-weight: 400;
  line-height: 0.9;
  letter-spacing: -0.03em;
  position: relative;
}
.bar-weight span {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 0.22em;
  letter-spacing: 0.18em;
  vertical-align: 0.7em;
  margin-left: 0.4em;
  font-weight: 500;
}
.bar-bottom {
  flex-wrap: wrap;
  align-items: flex-end;
  font-size: 0.65rem;
}
.bar-fineness, .bar-standard { font-weight: 500; }
.bar-serial { color: oklch(35% 0.005 250); }

.spec-list { display: flex; flex-direction: column; }
.spec-list > div {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--border);
  align-items: baseline;
}
.spec-list > div:first-child { padding-top: 0; }
.spec-list > div:last-child { border-bottom: 0; }
.spec-list dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
}
.spec-list dd { font-size: var(--text-base); color: var(--text); margin: 0; }

.backing-note {
  max-width: 64ch;
  margin: clamp(2.5rem, 5vw, 4rem) auto 0;
  padding: 0 var(--pad-x);
  color: var(--text-dim);
  font-size: var(--text-sm);
  font-style: italic;
  line-height: 1.55;
}

/* ---------- Closing ---------- */
.closing {
  padding: clamp(6rem, 12vw, 12rem) var(--pad-x);
  max-width: var(--max-w);
  margin: 0 auto;
}
.closing-line {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--text-hero);
  line-height: 0.92;
  letter-spacing: -0.04em;
  background: linear-gradient(180deg, var(--silver-1) 30%, var(--silver-3) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.closing-line em {
  font-weight: 400;
  background: linear-gradient(180deg, oklch(85% 0.025 260), oklch(55% 0.025 260));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Footer ---------- */
.site-footer { padding: clamp(3rem, 5vw, 5rem) var(--pad-x) clamp(2rem, 3vw, 3rem); border-top: 1px solid var(--border); }
.footer-cols {
  max-width: var(--max-w);
  margin: 0 auto clamp(2rem, 4vw, 4rem);
  display: grid;
  gap: var(--space-8);
  grid-template-columns: 1fr;
}
@media (min-width: 760px) { .footer-cols { grid-template-columns: 2fr 1fr 1fr 2fr; } }
.footer-logo { font-family: var(--font-display); font-size: 1.4rem; margin-bottom: var(--space-2); letter-spacing: -0.01em; }
.footer-head {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}
.footer-cols ul { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-cols a:hover { color: var(--text); }
.footer-contract {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  word-break: break-all;
  color: var(--text-dim);
  background: oklch(100% 0 0 / 0.025);
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  display: block;
  line-height: 1.4;
}
.footer-base {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-top: var(--space-6);
  border-top: 1px solid var(--border);
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}