/* Checksum — studio site
   Paper #F4F2ED · Navy #0C1B33 · Gold #F4B000
--------------------------------------------*/

:root {
  --paper: #f4f2ed;
  --paper-deep: #ebe6db;
  --navy: #0c1b33;
  --navy-mid: #16304f;
  --gold: #f4b000;
  --gold-deep: #d99a00;
  --ink: #0c1b33;
  --ink-soft: #3a475c;
  --mist: rgba(12, 27, 51, 0.08);
  --line: rgba(12, 27, 51, 0.14);
  --line-strong: rgba(12, 27, 51, 0.28);
  --cream-on-navy: rgba(244, 242, 237, 0.72);

  --font-display: "Fraunces", "Iowan Old Style", "Palatino Linotype", serif;
  --font-body: "Figtree", "Avenir Next", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  --space: clamp(1rem, 2.6vw, 2rem);
  --measure: 72rem;
  --radius: 0.25rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --header-h: 4.5rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

body.is-locked {
  overflow: hidden;
}

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

a {
  color: inherit;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 560;
  letter-spacing: -0.02em;
  line-height: 1.12;
  margin: 0 0 0.6em;
}

h1 {
  font-size: clamp(2.6rem, 7vw, 5.4rem);
}

h2 {
  font-size: clamp(1.9rem, 4vw, 3rem);
}

h3 {
  font-size: 1.35rem;
}

p {
  margin: 0 0 1em;
}

p:last-child {
  margin-bottom: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 200;
  padding: 0.55rem 0.9rem;
  background: var(--gold);
  color: var(--navy);
  font-weight: 700;
  text-decoration: none;
}

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

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.kicker::before {
  content: "";
  width: 0.55rem;
  height: 0.55rem;
  background: var(--gold);
  flex-shrink: 0;
}

.lede {
  font-size: clamp(1.1rem, 1.6vw, 1.28rem);
  color: var(--ink-soft);
  max-width: 36rem;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: 3rem;
  padding: 0.7rem 1.2rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.98rem;
  font-weight: 650;
  text-decoration: none;
  cursor: pointer;
  transition: background 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease), transform 180ms var(--ease);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--gold);
  color: var(--navy);
}

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

.btn-navy {
  background: var(--navy);
  color: var(--paper);
}

.btn-navy:hover {
  background: var(--navy-mid);
}

.btn-ghost {
  background: transparent;
  color: var(--navy);
  border-color: var(--line-strong);
}

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

.btn-ghost-light {
  background: transparent;
  color: var(--paper);
  border-color: rgba(244, 242, 237, 0.28);
}

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

.btn-store-icon {
  width: 1.25rem;
  height: 1.25rem;
}

.btn-store-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.05;
}

.btn-store-eyebrow {
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  opacity: 0.75;
}

.btn-store-name {
  font-size: 1rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Header
-----------*/

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  padding: 0.7rem var(--space);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled,
.site-header-solid {
  border-bottom-color: var(--line);
}

.logo {
  display: block;
  text-decoration: none;
}

.logo img {
  width: min(168px, 42vw);
  height: auto;
  mix-blend-mode: multiply;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.6rem;
}

.site-nav a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-soft);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--navy);
}

.nav-toggle {
  display: none;
  width: 2.6rem;
  height: 2.6rem;
  padding: 0;
  border: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
}

.nav-toggle-bits {
  display: grid;
  gap: 4px;
  justify-content: center;
}

.nav-toggle-bits i {
  display: block;
  width: 1.15rem;
  height: 3px;
  background: var(--navy);
}

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

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(2.5rem, 6vw, 5.5rem) var(--space) clamp(3rem, 7vw, 6rem);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--mist) 1px, transparent 1px),
    linear-gradient(90deg, var(--mist) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.45), transparent 78%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(16rem, 0.85fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
  max-width: var(--measure);
  margin: 0 auto;
}

.hero-copy h1 em {
  font-style: italic;
  font-weight: 500;
  color: var(--navy);
}

.hero-copy .lede {
  margin-bottom: 1.8rem;
}

.status-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.4rem;
  margin: 2rem 0 0;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.status-bar strong {
  font-weight: 500;
  color: var(--navy);
}

.bitfield {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 6px;
  aspect-ratio: 1;
  max-width: 26rem;
  margin-left: auto;
}

.bitfield i {
  display: block;
  background: var(--navy);
  animation: bit-settle 1.4s var(--ease) both;
}

.bitfield i.gold {
  background: var(--gold);
}

.bitfield i.paper {
  background: var(--paper-deep);
  box-shadow: inset 0 0 0 1px var(--line);
}

.bitfield i:nth-child(3n) { animation-delay: 80ms; }
.bitfield i:nth-child(4n) { animation-delay: 140ms; }
.bitfield i:nth-child(5n) { animation-delay: 210ms; }
.bitfield i:nth-child(7n) { animation-delay: 280ms; }

@keyframes bit-settle {
  from {
    transform: scale(0.4);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

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

.section {
  padding: clamp(3.5rem, 8vw, 6.5rem) var(--space);
}

.section-inner {
  max-width: var(--measure);
  margin: 0 auto;
}

.section-header {
  max-width: 38rem;
  margin-bottom: 2.4rem;
}

.section-header p {
  color: var(--ink-soft);
}

.narrow {
  max-width: 46rem;
}

/* Work
---------*/

.section-work {
  background: var(--navy);
  color: var(--paper);
}

.section-work .kicker,
.section-work .section-header p {
  color: var(--cream-on-navy);
}

.section-work .kicker::before {
  background: var(--gold);
}

.work-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 1rem;
}

.work-card {
  position: relative;
  padding: clamp(1.6rem, 3vw, 2.4rem);
  border: 1px solid rgba(244, 242, 237, 0.12);
  background: var(--navy-mid);
}

.work-card-feature {
  min-height: 22rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.work-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
}

.work-card h3 {
  margin: 0.7rem 0 0.55rem;
  font-size: clamp(2rem, 4vw, 3.1rem);
  color: var(--paper);
}

.work-card p {
  color: var(--cream-on-navy);
  max-width: 34rem;
}

.work-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.2rem 0 1.6rem;
}

.chip {
  padding: 0.28rem 0.55rem;
  border: 1px solid rgba(244, 242, 237, 0.18);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--paper);
}

.work-card-next {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background:
    repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 10px,
      rgba(244, 242, 237, 0.03) 10px,
      rgba(244, 242, 237, 0.03) 11px
    );
}

.work-card-next h3 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
}

.next-pixels {
  display: flex;
  gap: 6px;
  margin-top: 1.5rem;
}

.next-pixels i {
  width: 0.7rem;
  height: 0.7rem;
  background: rgba(244, 242, 237, 0.18);
}

.next-pixels i:nth-child(2) {
  background: var(--gold);
  animation: pulse-bit 1.8s var(--ease) infinite;
}

@keyframes pulse-bit {
  50% { opacity: 0.35; }
}

/* Studio
-----------*/

.studio-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}

.principle-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.principle-list li {
  display: grid;
  grid-template-columns: 3.2rem 1fr;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
}

.principle-list span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--gold-deep);
}

.principle-list strong {
  display: block;
  margin-bottom: 0.25rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 560;
}

.principle-list p {
  color: var(--ink-soft);
}

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

.section-cta {
  padding-top: 0;
}

.cta-panel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  max-width: var(--measure);
  margin: 0 auto;
  padding: clamp(1.6rem, 3vw, 2.2rem);
  background: var(--paper-deep);
  border: 1px solid var(--line);
}

.cta-panel h2 {
  margin-bottom: 0.35rem;
}

.cta-panel p {
  color: var(--ink-soft);
  max-width: 32rem;
}

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

.site-footer {
  padding: 2rem var(--space) 2.4rem;
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1.2rem 2rem;
  align-items: center;
  max-width: var(--measure);
  margin: 0 auto;
}

.footer-brand img {
  width: 140px;
  mix-blend-mode: multiply;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.2rem;
}

.site-footer nav a {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-soft);
}

.site-footer nav a:hover {
  color: var(--navy);
}

.footer-copy {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

/* Subpages
-------------*/

.page-hero {
  position: relative;
  padding: clamp(2.4rem, 6vw, 4.5rem) var(--space) 2.5rem;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--mist) 1px, transparent 1px),
    linear-gradient(90deg, var(--mist) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.35), transparent 80%);
  pointer-events: none;
}

.page-hero-inner {
  position: relative;
  max-width: var(--measure);
  margin: 0 auto;
}

.page-hero h1 {
  max-width: 16ch;
}

.help-paths {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.help-path {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 1.3rem 1.2rem 1.4rem;
  border: 1px solid var(--line);
  background: var(--paper);
  text-decoration: none;
  transition: border-color 180ms var(--ease), transform 180ms var(--ease);
}

.help-path:hover {
  border-color: var(--navy);
  transform: translateY(-2px);
}

.help-path-icon {
  display: grid;
  place-items: center;
  width: 2.4rem;
  height: 2.4rem;
  margin-bottom: 0.4rem;
  background: var(--navy);
  color: var(--gold);
}

.help-path-icon svg {
  width: 1.25rem;
  height: 1.25rem;
}

.help-path strong {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 560;
}

.help-path span {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.faq-list {
  display: grid;
  gap: 0.6rem;
}

.faq-item {
  border: 1px solid var(--line);
  background: var(--paper);
}

.faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: 1rem 1.15rem;
  font-weight: 650;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "";
  float: right;
  width: 0.55rem;
  height: 0.55rem;
  margin-top: 0.35rem;
  background: var(--gold);
}

.faq-item[open] summary::after {
  background: var(--navy);
}

.faq-item p {
  padding: 0 1.15rem 1.1rem;
  color: var(--ink-soft);
}

.policy {
  max-width: 46rem;
}

.policy h2 {
  margin-top: 2rem;
  font-size: 1.6rem;
}

.policy ul {
  padding-left: 1.15rem;
  color: var(--ink-soft);
}

.policy a {
  color: var(--navy);
  text-underline-offset: 0.18em;
}

.policy a:hover {
  color: var(--gold-deep);
}

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

@media (max-width: 860px) {
  .nav-toggle {
    display: grid;
    place-items: center;
  }

  .site-nav {
    position: fixed;
    inset: var(--header-h) 0 0;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 1.2rem var(--space) 2rem;
    background: var(--paper);
    border-top: 1px solid var(--line);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    width: 100%;
    padding: 1rem 0;
    border-bottom: 1px solid var(--line);
    font-size: 0.95rem;
  }

  .hero-inner,
  .work-grid,
  .studio-layout,
  .help-paths,
  .footer-inner {
    grid-template-columns: 1fr;
  }

  .bitfield {
    margin: 0.5rem 0 0;
    max-width: 18rem;
  }

  .footer-copy {
    order: 3;
  }
}

@media (max-width: 520px) {
  .help-paths {
    grid-template-columns: 1fr;
  }

  .cta-panel .actions {
    width: 100%;
  }

  .cta-panel .btn {
    flex: 1;
  }
}