/* OpenCard DB landing page
   Palette: engraved banknote. Deep plum surfaces, gold intaglio line-work,
   pure white content bands. One family (Archivo variable): expanded heavy
   for display, normal width for body. Hex tokens first for legacy engines,
   OKLCH overrides where supported. */

:root {
  --plum:       #2b1729;
  --plum-deep:  #1a0919;
  --plum-mid:   #381e36;
  --plum-line:  #4c334a;
  --ivory:      #f6f3eb;
  --ivory-dim:  #c5b4c3;
  --gold:       #f0c63a;
  --gold-bright:#f7d46b;
  --gold-metal: #c3972a;
  --gold-dim:   rgba(240, 198, 58, 0.38);
  --gold-faint: rgba(240, 198, 58, 0.16);
  --ochre:      #825b00;
  --ink:        #20171f;
  --ink-2:      #544953;
  --hairline-ink: rgba(32, 23, 31, 0.14);
  --ink-wash:     rgba(32, 23, 31, 0.07);
  --ivory-wash:   rgba(246, 243, 235, 0.1);
  --bg:         #ffffff;
  --apricot:    #f4ac6f;
  --lav:        #e3d1e1;

  --font-body: "Archivo", system-ui, sans-serif;
  --font-mono: "Spline Sans Mono", ui-monospace, "SF Mono", monospace;

  --shadow-card:  0 30px 60px -20px rgba(10, 2, 10, 0.7);
  --shadow-float: 0 20px 40px -18px rgba(10, 2, 10, 0.8);

  --radius: 14px;
  --z-nav: 10;
}

@supports (color: oklch(0% 0 0)) {
  :root {
    --plum:       oklch(24% 0.045 330);
    --plum-deep:  oklch(17.5% 0.04 330);
    --plum-mid:   oklch(28% 0.055 330);
    --plum-line:  oklch(36% 0.05 330);
    --ivory:      oklch(96.5% 0.012 91);
    --ivory-dim:  oklch(79% 0.028 330);
    --gold:       oklch(84% 0.155 91);
    --gold-bright:oklch(88% 0.13 91);
    --gold-metal: oklch(70% 0.13 85);
    --gold-dim:   oklch(84% 0.155 91 / 0.38);
    --gold-faint: oklch(84% 0.155 91 / 0.16);
    --ochre:      oklch(50% 0.105 80);
    --ink:        oklch(22% 0.02 330);
    --ink-2:      oklch(42% 0.022 330);
    --hairline-ink: oklch(22% 0.02 330 / 0.14);
    --ink-wash:     oklch(22% 0.02 330 / 0.07);
    --ivory-wash:   oklch(96.5% 0.012 91 / 0.1);
    --apricot:    oklch(80% 0.115 60);
    --lav:        oklch(88% 0.03 330);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--plum);
  color: var(--ivory);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 { text-wrap: balance; }
p { text-wrap: pretty; }

a { color: inherit; }

::selection { background: var(--gold); color: var(--plum-deep); }

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Display voice: same family, expanded and heavy */
.display, h1, h2 {
  font-family: var(--font-body);
  font-weight: 750;
  font-stretch: 118%;
  letter-spacing: -0.02em;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: calc(var(--z-nav) + 1);
  padding: 0.6rem 1.1rem;
  border-radius: 999px;
  background: var(--gold);
  color: var(--plum-deep);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

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

.nav-wrap {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-nav);
  display: flex;
  justify-content: center;
  padding: 0.9rem 1rem 0;
  pointer-events: none;
}

.nav {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 3vw, 2.25rem);
  width: min(1060px, 100%);
  padding: 0.55rem 0.6rem 0.55rem 1.1rem;
  border: 1px solid var(--gold-faint);
  border-radius: 999px;
  background: rgba(26, 9, 25, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.01em;
  text-decoration: none;
  color: var(--ivory);
}

.brand-mark {
  width: 26px;
  height: 26px;
  color: var(--gold);
  flex: none;
}

.nav-links {
  display: flex;
  gap: clamp(0.4rem, 1.8vw, 1.1rem);
  margin-left: auto;
}

.nav-links a {
  padding: 0.4rem 0.5rem;
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--ivory-dim);
  text-decoration: none;
  transition: color 160ms ease-out;
}

.nav-links a:hover { color: var(--gold); }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 180ms cubic-bezier(0.22, 1, 0.36, 1),
              background-color 180ms ease-out,
              border-color 180ms ease-out,
              color 180ms ease-out;
}

.btn:active { transform: scale(0.97); }

.btn-nav {
  padding: 0.5rem 1.15rem;
  background: var(--gold);
  color: var(--plum-deep);
}

.btn-nav:hover { background: var(--ivory); }

.btn-gold {
  background: var(--gold);
  color: var(--plum-deep);
}

.btn-gold:hover { background: var(--ivory); }

.btn-ghost {
  border-color: var(--gold-dim);
  color: var(--ivory);
}

.btn-ghost:hover { border-color: var(--gold); color: var(--gold); }

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

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(8.5rem, 16vh, 11rem) clamp(1.25rem, 5vw, 4rem) 0;
}

.hero-engraving {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-engraving svg {
  position: absolute;
  fill: none;
  stroke: var(--gold);
  stroke-width: 0.7;
}

#rosette-large {
  width: min(120vmin, 1000px);
  height: min(120vmin, 1000px);
  top: -28%;
  right: -18%;
  opacity: 0.28;
}

#rosette-small {
  width: 460px;
  height: 460px;
  bottom: -34%;
  left: -8%;
  opacity: 0.18;
}

@media (prefers-reduced-motion: no-preference) {
  .js #rosette-large,
  .js #rosette-small { will-change: transform; }
  .js #rosette-large { animation: spin 240s linear infinite; }
  .js #rosette-small { animation: spin 180s linear infinite reverse; }
}

@keyframes spin { to { transform: rotate(360deg); } }

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: center;
  width: min(1120px, 100%);
  margin: 0 auto;
}

.hero h1 {
  margin: 0 0 1.4rem;
  font-weight: 780;
  font-stretch: 122%;
  font-size: clamp(2.5rem, 4.4vw + 0.9rem, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.028em;
}

.hero-sub {
  max-width: 52ch;
  margin: 0 0 2.2rem;
  font-size: 1.1rem;
  color: var(--ivory-dim);
}

.hero-cta { display: flex; flex-wrap: wrap; gap: 0.9rem; }

/* Specimen card */

.hero-card {
  position: relative;
  margin: 0;
  transform: rotate(-4deg);
  transition: transform 500ms cubic-bezier(0.22, 1, 0.36, 1);
}

.hero-card:hover { transform: rotate(-1.5deg); }

@media (prefers-reduced-motion: reduce) {
  .hero-card, .hero-card:hover { transform: none; }
}

.specimen {
  position: relative;
  overflow: hidden;
  aspect-ratio: 1.586;
  border-radius: 20px;
  border: 1px solid var(--gold-dim);
  background: linear-gradient(135deg, var(--plum-mid), var(--plum-deep) 70%);
  box-shadow: var(--shadow-card);
  padding: clamp(1.1rem, 2.5vw, 1.6rem);
  display: flex;
  flex-direction: column;
}

.specimen-engraving {
  position: absolute;
  inset: -20% -10%;
  width: 120%;
  height: 140%;
  fill: none;
  stroke: var(--gold);
  stroke-width: 0.55;
  opacity: 0.28;
}

.specimen > :not(.specimen-engraving) { position: relative; }

.specimen-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.specimen-brand {
  font-weight: 700;
  font-stretch: 110%;
  letter-spacing: 0.22em;
  font-size: 0.8rem;
  color: var(--ivory);
}

.specimen-tag {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.78rem;
  color: var(--gold);
  letter-spacing: 0.18em;
}

.chip {
  width: 46px;
  height: 34px;
  margin-top: auto;
  border-radius: 7px;
  background:
    linear-gradient(to right, transparent 46%, rgba(80, 58, 8, 0.55) 46%, rgba(80, 58, 8, 0.55) 54%, transparent 54%),
    linear-gradient(to bottom, transparent 30%, rgba(80, 58, 8, 0.55) 30%, rgba(80, 58, 8, 0.55) 36%, transparent 36%, transparent 62%, rgba(80, 58, 8, 0.55) 62%, rgba(80, 58, 8, 0.55) 68%, transparent 68%),
    linear-gradient(135deg, var(--gold-bright), var(--gold-metal));
}

.specimen-number {
  margin: 0.9rem 0 1.1rem;
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 2.6vw, 1.35rem);
  letter-spacing: 0.08em;
  color: var(--lav);
}

.specimen-bottom {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.specimen-label {
  display: block;
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.15rem;
}

.specimen-value {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ivory);
}

.hero-json {
  position: absolute;
  right: -4%;
  bottom: -3.4rem;
  transform: rotate(2deg);
  margin: 0;
  border: 1px solid var(--plum-line);
  border-radius: 10px;
  background: var(--plum-deep);
  padding: 0.8rem 1rem;
  box-shadow: var(--shadow-float);
}

.hero-json pre { margin: 0; }

.hero-json code {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.7;
  color: var(--lav);
}

/* Stats strip */

.hero-stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  width: min(1120px, 100%);
  margin: clamp(4.5rem, 9vh, 6.5rem) auto 0;
  padding: 1.8rem 0 2.4rem;
  border-top: 1px solid var(--gold-faint);
}

.hero-stats dt {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.3rem;
}

.hero-stats dd {
  margin: 0;
  font-weight: 680;
  font-stretch: 116%;
  font-size: clamp(1.2rem, 1.6vw, 1.4rem);
  letter-spacing: -0.01em;
  color: var(--ivory);
}

/* ---------- Bands ---------- */

.band {
  background: var(--bg);
  color: var(--ink);
  padding: clamp(4.5rem, 10vw, 7.5rem) clamp(1.25rem, 5vw, 4rem);
}

.band-dark {
  background: var(--plum);
  color: var(--ivory);
}

.band-inner { width: min(1120px, 100%); margin: 0 auto; }

.band h2 {
  margin: 0 0 1.1rem;
  font-size: clamp(1.75rem, 2.3vw + 0.6rem, 2.7rem);
  line-height: 1.12;
  max-width: 24ch;
}

.band-lede {
  max-width: 62ch;
  margin: 0 0 3rem;
  font-size: 1.08rem;
  color: var(--ink-2);
}

.band-dark .band-lede { color: var(--ivory-dim); }

.band a { color: var(--ochre); text-underline-offset: 3px; }
.band a:hover { color: var(--ink); }
.band-dark a { color: var(--gold); }
.band-dark a:hover { color: var(--ivory); }

.band-note { color: var(--ink-2); font-size: 0.95rem; max-width: 52ch; }

/* Split bands */

.band-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: center;
}

.band-split .band-text p { max-width: 52ch; }
.band-dark .band-text > p { color: var(--ivory-dim); }
.band:not(.band-dark) .band-text > p { color: var(--ink-2); }

.band-split-rev .band-text { order: 0; }
.band-split-rev .code { order: -1; }

/* Field list */

.field-list { margin: 2.2rem 0 0; }

.field-list > div {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 1rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--gold-faint);
}

.field-list dt {
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
  padding-top: 0.15rem;
}

.field-list dd { margin: 0; color: var(--ivory-dim); font-size: 0.98rem; }

/* ---------- Ledger (data access) ---------- */

.ledger { border-top: 1px solid var(--hairline-ink); }

.ledger-row {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: center;
  padding: 2.1rem 0;
  border-bottom: 1px solid var(--hairline-ink);
}

.ledger-head h3 {
  margin: 0 0 0.4rem;
  font-weight: 700;
  font-stretch: 112%;
  font-size: 1.28rem;
  letter-spacing: -0.01em;
}

.ledger-head p { margin: 0; color: var(--ink-2); font-size: 0.98rem; max-width: 40ch; }

/* ---------- Code panels ---------- */

.code {
  position: relative;
  border-radius: var(--radius);
  background: var(--plum-deep);
  border: 1px solid var(--plum-line);
  padding: 1.05rem 1.2rem;
  overflow: hidden;
}

.code pre {
  margin: 0;
  overflow-x: auto;
  scrollbar-width: thin;
}

.code code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.75;
  color: var(--lav);
  white-space: pre;
}

.code-tall { padding: 1.4rem 1.5rem; }

.j-p { color: var(--gold); }
.j-s { color: var(--lav); }
.j-n { color: var(--apricot); }
.j-c { color: var(--gold); font-weight: 500; }

.inline {
  font-family: var(--font-mono);
  font-size: 0.85em;
  padding: 0.1em 0.4em;
  border-radius: 5px;
  background: var(--ink-wash);
}

.band-dark .inline { background: var(--ivory-wash); }

.copy-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--gold-dim);
  background: var(--plum-deep);
  color: var(--gold);
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  opacity: 0;
  transition: opacity 160ms ease-out, background-color 160ms ease-out;
}

.code:hover .copy-btn,
.copy-btn:focus-visible { opacity: 1; }

@media (hover: none) { .copy-btn { opacity: 1; } }

.copy-btn:hover { background: var(--plum); }

.copy-btn.copied {
  background: var(--gold);
  color: var(--plum-deep);
  border-color: var(--gold);
  opacity: 1;
}

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

.steps {
  list-style: none;
  counter-reset: step;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(215px, 1fr));
  gap: 2rem;
  margin: 0 0 3.5rem;
  padding: 0;
}

.steps li {
  counter-increment: step;
  border-top: 1px solid var(--gold-faint);
  padding-top: 1.1rem;
}

.steps li::before {
  content: counter(step);
  display: block;
  font-weight: 800;
  font-stretch: 125%;
  font-size: 1.55rem;
  line-height: 1;
  color: var(--gold);
  margin-bottom: 0.7rem;
}

.steps h3 {
  margin: 0 0 0.35rem;
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.steps p { margin: 0; font-size: 0.92rem; color: var(--ivory-dim); }

/* Export callout */

.export-callout {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
  border: 1px solid var(--gold-dim);
  border-radius: var(--radius);
  padding: clamp(1.5rem, 3.5vw, 2.4rem);
}

.export-callout h3 {
  margin: 0 0 0.5rem;
  font-weight: 700;
  font-stretch: 112%;
  font-size: 1.32rem;
  letter-spacing: -0.01em;
}

.export-callout p { margin: 0; color: var(--ivory-dim); font-size: 0.98rem; }

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

.footer {
  background: var(--plum-deep);
  padding: clamp(3.5rem, 7vw, 5.5rem) clamp(1.25rem, 5vw, 4rem)
           max(2.5rem, env(safe-area-inset-bottom));
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  width: min(1120px, 100%);
  margin: 0 auto 3.5rem;
}

.footer-brand {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-weight: 600;
}

.footer-brand .brand-mark { color: var(--gold); }

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.footer-cols h4 {
  margin: 0 0 0.9rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
}

.footer-cols a {
  display: block;
  padding: 0.28rem 0;
  font-size: 0.92rem;
  color: var(--ivory-dim);
  text-decoration: none;
}

.footer-cols a:hover { color: var(--gold); }

.footer-fine {
  width: min(1120px, 100%);
  margin: 0 auto;
  padding-top: 1.8rem;
  border-top: 1px solid var(--gold-faint);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--ivory-dim);
  max-width: none;
}

/* ---------- Reveal ----------
   Content is visible by default. JS adds .reveal-pre only to elements
   below the fold, so the page never ships blank without JS or in
   renderers where transitions don't run. */

.reveal-pre {
  opacity: 0;
  transform: translateY(14px);
}

.reveal-pre.in {
  opacity: 1;
  transform: none;
  transition: opacity 600ms ease-out, transform 600ms cubic-bezier(0.22, 1, 0.36, 1);
}

@media (prefers-reduced-motion: reduce) {
  .reveal-pre { opacity: 1; transform: none; transition: none; }
}

/* ---------- Responsive ---------- */

@media (max-width: 1020px) {
  .hero-stats { grid-template-columns: repeat(2, 1fr); row-gap: 1.8rem; }
}

@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-card { max-width: 480px; margin-top: 1rem; }
  .hero-json { display: none; }
  .band-split { grid-template-columns: 1fr; align-items: start; }
  .band-split-rev .code { order: 0; }
  .ledger-row { grid-template-columns: 1fr; gap: 1rem; align-items: start; }
  .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 760px) {
  .nav {
    flex-wrap: wrap;
    border-radius: 22px;
    padding-bottom: 0.35rem;
  }
  .nav-links {
    order: 4;
    flex-basis: 100%;
    justify-content: center;
    gap: 0.15rem;
    margin: 0.3rem 0 0;
    padding-top: 0.35rem;
    border-top: 1px solid var(--gold-faint);
  }
  .nav-links a { padding: 0.45rem 0.7rem; }
  .hero { padding-top: 9.5rem; }
  .footer-cols { grid-template-columns: 1fr 1fr; }
  .export-callout { grid-template-columns: 1fr; }
}