@font-face {
  font-family: SpaceGrotesk;
  src: url("/assets/site/fonts/SpaceGrotesk.ttf") format("truetype");
  font-display: swap;
  font-weight: 400 800;
}
@font-face {
  font-family: Lexend;
  src: url("/assets/site/fonts/Lexend.ttf") format("truetype");
  font-display: swap;
  font-weight: 400 700;
}
@font-face {
  font-family: JetBrainsMono;
  src: url("/assets/site/fonts/JetBrainsMono.ttf") format("truetype");
  font-display: swap;
  font-weight: 400 700;
}
@font-face {
  font-family: NotoArabic;
  src: url("/assets/site/fonts/NotoSansArabic.ttf") format("truetype");
  font-display: swap;
  font-weight: 100 900;
}
@font-face {
  font-family: NotoKorean;
  src: url("/assets/site/fonts/NotoSansKR.ttf") format("truetype");
  font-display: swap;
  font-weight: 100 900;
}
:root {
  --ink: #15142b;
  --muted: #625f76;
  --paper: #fbfaf6;
  --card: #fff;
  --indigo: #3d5afe;
  --indigo-hover: #2f46d6;
  --indigo-deep: #1a2240;
  --amber: #f7b543;
  --line: #dedbea;
  --ok: #247a57;
  --danger: #a63c42;
  --shadow: 0 18px 50px rgba(26, 34, 64, 0.12);
  --shadow-soft: 0 8px 30px rgba(26, 34, 64, 0.07);
  --radius: 1.25rem;
  --header: 4.75rem;
  --measure: 72rem;
  color-scheme: light;
}
.sr-only {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
[hidden] {
  display: none !important;
}
.code-demo.code-demo::after {
  content: "01 → 02 → 03";
}
.article-aside h2 {
  margin-block: 0 1rem;
  font-size: clamp(1.45rem, 2vw, 2rem);
  overflow-wrap: normal;
}
.article-aside h3 {
  font-size: 1.25rem;
}
.article-aside nav {
  display: grid;
  gap: 0.5rem;
}
.article-aside hr {
  margin-block: 1.35rem;
  border: 0;
  border-block-start: 1px solid var(--line);
}
.article-aside .button {
  inline-size: 100%;
  text-align: center;
}
.consent[data-consent] {
  inset-inline-start: auto;
  max-inline-size: 25rem;
  margin-inline: 0;
}
.consent:not([hidden]) ~ * {
  scroll-margin-block-end: 13rem;
}
:focus-visible {
  scroll-margin-block-start: calc(var(--header) + 1rem);
  scroll-margin-block-end: 13rem;
}
.legal-page {
  max-inline-size: 58rem;
  padding-block: clamp(3rem, 7vw, 6rem);
}
.legal-page header {
  padding-block-end: 2rem;
  border-block-end: 1px solid var(--line);
}
.legal-page h1 {
  max-inline-size: 18ch;
  font-size: clamp(2.6rem, 6vw, 5rem);
}
.legal-page section {
  padding-block: 1.25rem;
  border-block-end: 1px solid var(--line);
}
.legal-page h2 {
  font-size: clamp(1.35rem, 2.5vw, 2rem);
}
.legal-page p {
  max-inline-size: 76ch;
  white-space: normal;
}
.language-fallback {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.language-fallback a {
  min-block-size: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0.5rem;
}
.language-fallback a[aria-current="page"] {
  font-weight: 800;
}
.site-ready .no-js-fallback,
html:not(.site-ready) .js-only-language,
html:not(.site-ready) .menu-button {
  display: none;
}
@media (max-width: 58rem) {
  html:not(.site-ready) .nav-links {
    display: flex;
  }
}
.concept-map {
  margin: 2.5rem 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, #fff 0 68%, #f1efff);
  overflow: hidden;
}
.concept-label {
  padding: 0.75rem 1rem;
  background: var(--indigo-deep);
  color: #fff;
  font:
    700 0.76rem/1 JetBrainsMono,
    monospace;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.concept-map ol {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  list-style: none;
  margin: 0;
  padding: 1.25rem;
  gap: 0.75rem;
  counter-reset: visual;
}
.concept-map li {
  position: relative;
  min-inline-size: 0;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  background: #fff;
}
.concept-map li:not(:last-child)::after {
  content: "→";
  position: absolute;
  z-index: 2;
  inset-inline-end: -0.75rem;
  inset-block-start: 50%;
  inline-size: 1.5rem;
  block-size: 1.5rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--amber);
  color: var(--ink);
  font-weight: 800;
  transform: translateY(-50%);
}
html[dir="rtl"] .concept-map li:not(:last-child)::after {
  content: "←";
}
.concept-map li > span {
  display: block;
  color: var(--indigo);
  font:
    800 1.45rem/1 SpaceGrotesk,
    sans-serif;
}
.concept-map strong,
.concept-map small {
  display: block;
}
.concept-map strong {
  margin-block: 0.55rem 0.25rem;
  font-family: SpaceGrotesk, sans-serif;
}
.concept-map small {
  color: var(--muted);
  line-height: 1.4;
}
.concept-map figcaption {
  padding: 0 1.25rem 1.25rem;
  color: var(--muted);
  font-size: 0.9rem;
}
.concept-identity li:nth-child(2),
.concept-identity li:nth-child(3) {
  box-shadow: inset 0 -4px var(--amber);
}
.concept-cardinality li:nth-child(3) {
  border-color: var(--danger);
  background: #fff7f7;
}
.concept-timeline li:nth-child(3) {
  border-color: var(--indigo);
  background: #f4f2ff;
}
.code-compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.code-compare section {
  min-inline-size: 0;
  overflow: hidden;
  border-radius: 1rem;
  background: var(--indigo-deep);
  box-shadow: 0 10px 30px rgba(36, 32, 94, 0.12);
}
.code-label {
  display: block;
  padding: 0.55rem 1rem;
  color: #fff;
  font:
    700 0.76rem/1 JetBrainsMono,
    monospace;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.code-label.before {
  background: var(--danger);
}
.code-label.after {
  background: var(--ok);
}
.code-compare pre {
  color: #e9e7ff;
  min-block-size: 12rem;
}
.observed {
  padding: 1rem 1.15rem;
  border-inline-start: 4px solid var(--amber);
  background: #fff8dc;
  border-radius: 0.25rem 0.8rem 0.8rem 0.25rem;
}
.observed strong {
  font-family: SpaceGrotesk, sans-serif;
}
@media (max-width: 46rem) {
  .concept-map ol,
  .code-compare {
    grid-template-columns: 1fr;
  }
  .concept-map li:not(:last-child)::after {
    content: "↓";
    inset-inline-end: auto;
    inset-inline-start: 50%;
    inset-block-start: auto;
    inset-block-end: -0.75rem;
    transform: translateX(-50%);
  }
  html[dir="rtl"] .concept-map li:not(:last-child)::after {
    content: "↓";
    transform: translateX(50%);
  }
  .code-compare pre {
    min-block-size: auto;
  }
}
.hero > * {
  min-inline-size: 0;
}
.hero {
  overflow: clip;
}
@media (max-width: 58rem) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
  }
}
@media (max-width: 35rem) {
  .language select {
    inline-size: min(8.5rem, 38vw) !important;
    color: var(--ink) !important;
    background-image: none !important;
    padding-inline: 0.45rem !important;
    font-size: 0.82rem !important;
  }
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-block-start: calc(var(--header) + 1rem);
  overflow-x: hidden;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font:
    400 clamp(0.98rem, 0.93rem + 0.2vw, 1.08rem)/1.65 Lexend,
    sans-serif;
  overflow-wrap: anywhere;
}
html[data-font="arabic"] body {
  font-family: NotoArabic, Lexend, sans-serif;
}
html[data-font="korean"] body {
  font-family: NotoKorean, Lexend, sans-serif;
  word-break: keep-all;
  overflow-wrap: break-word;
}
a {
  color: inherit;
  text-decoration-thickness: 0.09em;
  text-underline-offset: 0.18em;
}
img,
svg {
  max-inline-size: 100%;
}
button,
select,
a {
  touch-action: manipulation;
}
.skip-link {
  position: fixed;
  z-index: 100;
  inset-block-start: 0.5rem;
  inset-inline-start: 0.5rem;
  transform: translateY(-160%);
  background: var(--amber);
  color: var(--ink);
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
}
.skip-link:focus {
  transform: none;
}
.site-header {
  position: sticky;
  z-index: 50;
  inset-block-start: 0;
  background: rgba(251, 250, 246, 0.94);
  backdrop-filter: blur(14px);
  border-block-end: 1px solid var(--line);
}
.nav-shell {
  min-block-size: var(--header);
  max-inline-size: var(--measure);
  margin-inline: auto;
  padding-inline: clamp(1rem, 3vw, 2rem);
  display: flex;
  align-items: center;
  gap: 1rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font:
    750 1.08rem SpaceGrotesk,
    sans-serif;
  text-decoration: none;
  white-space: nowrap;
}
.brand img {
  inline-size: 2rem;
  block-size: 2rem;
}
.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(0.25rem, 1vw, 0.85rem);
  margin-inline: auto;
}
.nav-links a,
.language select {
  min-block-size: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 0.75rem;
  border-radius: 0.7rem;
  text-decoration: none;
}
.nav-links a:hover,
.nav-links a:focus-visible {
  background: #efedf9;
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.language select {
  border: 1px solid var(--line);
  background: var(--card);
  font: inherit;
  max-inline-size: 11rem;
}
.button {
  min-block-size: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1rem;
  border: 2px solid var(--indigo);
  border-radius: 0.8rem;
  background: var(--indigo);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}
.button:hover {
  background: var(--indigo-deep);
}
.button.secondary {
  background: transparent;
  color: var(--indigo-deep);
}
.menu-button {
  display: none;
  inline-size: 44px;
  block-size: 44px;
  border: 1px solid var(--line);
  border-radius: 0.7rem;
  background: var(--card);
  font-size: 1.4rem;
}
.shell {
  max-inline-size: var(--measure);
  margin-inline: auto;
  padding-inline: clamp(1rem, 3vw, 2rem);
}
.hero {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(17rem, 0.85fr);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: center;
  padding-block: clamp(4rem, 9vw, 8rem);
  min-block-size: min(46rem, calc(100svh - var(--header)));
}
.hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: -6rem -20vw auto 40%;
  block-size: 28rem;
  background: radial-gradient(
    circle at center,
    rgba(245, 185, 66, 0.36),
    transparent 64%
  );
  transform: rotate(-8deg);
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--indigo);
  font:
    750 0.78rem/1 SpaceGrotesk,
    sans-serif;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.eyebrow::before {
  content: "";
  inline-size: 2.4rem;
  block-size: 3px;
  background: var(--amber);
}
h1,
h2,
h3 {
  font-family: SpaceGrotesk, sans-serif;
  line-height: 1.05;
  letter-spacing: -0.035em;
  text-wrap: balance;
}
h1 {
  font-size: clamp(2.7rem, 7vw, 6.3rem);
  margin: 0.75rem 0 1.2rem;
  max-inline-size: 14ch;
}
h2 {
  font-size: clamp(1.9rem, 4vw, 3.5rem);
}
h3 {
  font-size: 1.35rem;
}
.lead {
  font-size: clamp(1.08rem, 1rem + 0.5vw, 1.35rem);
  color: var(--muted);
  max-inline-size: 60ch;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-block-start: 2rem;
}
.code-demo {
  position: relative;
  background: var(--indigo-deep);
  color: #e9e7ff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding-block: 1rem;
  transform: rotate(1.5deg);
}
.code-demo::after {
  content: "expect: theory → test → evidence";
  position: absolute;
  inset-block-end: -1.4rem;
  inset-inline-end: 1rem;
  background: var(--amber);
  color: var(--ink);
  padding: 0.35rem 0.65rem;
  font:
    700 0.72rem JetBrainsMono,
    monospace;
  transform: rotate(-3deg);
}
.code-bar {
  display: flex;
  gap: 0.35rem;
  padding-inline: 1rem;
  padding-block-end: 0.8rem;
  border-block-end: 1px solid #454078;
}
.code-bar i {
  inline-size: 0.65rem;
  block-size: 0.65rem;
  border-radius: 50%;
  background: var(--amber);
}
pre {
  margin: 0;
  max-inline-size: 100%;
  overflow: auto;
  padding: 1.25rem;
  direction: ltr;
  text-align: start;
  tab-size: 2;
  scrollbar-color: var(--amber) var(--indigo-deep);
}
code {
  font-family: JetBrainsMono, monospace;
  direction: ltr;
  unicode-bidi: isolate;
}
.section {
  padding-block: clamp(3rem, 7vw, 6rem);
}
.section-heading {
  max-inline-size: 42rem;
  margin-block-end: 2rem;
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
  gap: 1rem;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.25rem, 3vw, 2rem);
  box-shadow: 0 8px 30px rgba(36, 32, 94, 0.05);
}
.card:nth-child(2n) {
  transform: translateY(clamp(0rem, 2vw, 1.3rem));
}
.number {
  font: 800 2.5rem/1 SpaceGrotesk;
  color: var(--amber);
}
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  align-items: stretch;
}
.price-card {
  display: flex;
  flex-direction: column;
}
.price-card.featured {
  border-color: var(--indigo);
  box-shadow: var(--shadow);
}
.price-status {
  min-block-size: 4rem;
  margin-block: 1rem;
  padding: 0.8rem;
  border-inline-start: 4px solid var(--amber);
  background: #f7f4e9;
}
.price-status[data-state="error"] {
  border-color: var(--danger);
  color: var(--danger);
}
.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(14rem, 19rem);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
}
.prose {
  max-inline-size: 48rem;
}
.prose h2 {
  font-size: clamp(1.55rem, 3vw, 2.3rem);
  margin-block-start: 2.8rem;
}
.prose p,
.prose li {
  max-inline-size: 68ch;
}
.article-aside {
  position: sticky;
  inset-block-start: calc(var(--header) + 1rem);
}
.breadcrumbs {
  padding-block: 1.2rem;
  color: var(--muted);
  font-size: 0.9rem;
}
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  padding: 0;
  margin: 0;
}
.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-inline-start: 0.4rem;
}
html[dir="rtl"] .breadcrumbs li:not(:last-child)::after {
  content: "\\";
}
.guide-list {
  display: grid;
  gap: 1rem;
}
.guide-link {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
}
.guide-link .arrow {
  font-size: 1.5rem;
}
html[dir="rtl"] .guide-link .arrow {
  transform: scaleX(-1);
}
.notice {
  padding: 1rem;
  border: 1px solid var(--amber);
  background: #fff8dc;
  border-radius: 0.8rem;
}
.site-footer {
  margin-block-start: 4rem;
  background: var(--indigo-deep);
  color: #eae8ff;
  padding-block: 3rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(2, 1fr);
  gap: 2rem;
}
.footer-links {
  display: grid;
  align-content: start;
  gap: 0.5rem;
}
.consent {
  position: fixed;
  z-index: 60;
  inset-inline: clamp(0.75rem, 3vw, 2rem);
  inset-block-end: clamp(0.75rem, 3vw, 2rem);
  max-inline-size: 38rem;
  margin-inline: auto;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem;
}
.consent[hidden] {
  display: none;
}
.consent p {
  margin: 0.25rem 0 1rem;
  color: var(--muted);
}
.consent-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.scroll-hint {
  font-size: 0.82rem;
  color: var(--muted);
}
:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 3px;
}
@media (max-width: 58rem) {
  .menu-button {
    display: inline-grid;
    place-items: center;
  }
  .nav-shell {
    flex-wrap: wrap;
  }
  .nav-links {
    display: none;
    flex-basis: 100%;
    order: 4;
    align-items: stretch;
    flex-direction: column;
    margin: 0;
    padding-block-end: 1rem;
  }
  .nav-links[data-open="true"] {
    display: flex;
  }
  .nav-links a {
    inline-size: 100%;
  }
  .nav-actions .button {
    display: none;
  }
  .hero {
    grid-template-columns: 1fr;
    min-block-size: auto;
  }
  .code-demo {
    max-inline-size: 38rem;
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
  .article-aside {
    position: static;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-grid > :first-child {
    grid-column: 1/-1;
  }
}
@media (max-width: 35rem) {
  .language select {
    inline-size: 44px;
    color: transparent;
    background-image: linear-gradient(45deg, transparent 50%, var(--ink) 50%);
    background-size: 6px 6px;
    background-repeat: no-repeat;
    background-position: center;
  }
  .pricing-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid > :first-child {
    grid-column: auto;
  }
  .guide-link {
    grid-template-columns: 1fr auto;
  }
  .guide-link .number {
    display: none;
  }
  .card:nth-child(2n) {
    transform: none;
  }
  h1 {
    font-size: clamp(2.45rem, 14vw, 4rem);
  }
}
@media (orientation: landscape) and (max-height: 32rem) {
  .hero {
    min-block-size: auto;
    padding-block: 2.5rem;
  }
  .site-header {
    position: relative;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .code-demo {
    transform: none;
  }
}
@media print {
  .site-header,
  .consent,
  .hero-actions,
  .site-footer {
    display: none;
  }
  .hero {
    display: block;
    min-block-size: auto;
  }
  .code-demo {
    box-shadow: none;
  }
}

/* Interaction and rhythm refinements shared by every public template. */
.brand {
  min-block-size: 44px;
}
.button {
  box-shadow: 0 5px 14px rgba(61, 90, 254, 0.16);
  transition:
    background-color 0.18s ease,
    border-color 0.18s ease,
    box-shadow 0.18s ease,
    transform 0.18s ease;
}
.button:hover {
  background: var(--indigo-hover);
  border-color: var(--indigo-hover);
  box-shadow: 0 8px 20px rgba(61, 90, 254, 0.23);
  transform: translateY(-1px);
}
.button.secondary {
  box-shadow: none;
}
.button.secondary:hover {
  background: #eef0ff;
  border-color: var(--indigo);
  color: var(--indigo-deep);
}
.card {
  box-shadow: var(--shadow-soft);
}
.card h2 {
  font-size: 1.35rem;
}
.number {
  color: #8a5a00;
}
.hero.pricing-hero {
  grid-template-columns: minmax(0, 48rem);
  min-block-size: auto;
  padding-block-end: clamp(2rem, 5vw, 4rem);
}
.breadcrumbs {
  padding-block: 0.45rem;
}
.breadcrumbs ol {
  align-items: center;
  gap: 0.2rem;
}
.breadcrumbs a {
  display: inline-flex;
  align-items: center;
  min-block-size: 44px;
  padding-inline: 0.2rem;
}
.breadcrumbs li:not(:last-child)::after {
  margin-inline: 0.2rem;
}
.footer-links {
  gap: 0.25rem;
  min-inline-size: 0;
}
.footer-links a {
  display: inline-flex;
  align-items: center;
  min-block-size: 44px;
  inline-size: fit-content;
  max-inline-size: 100%;
}
.consent-manage {
  min-block-size: 44px;
  inline-size: fit-content;
  max-inline-size: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  text-align: start;
  white-space: normal;
  overflow-wrap: anywhere;
  text-decoration: underline;
  text-decoration-thickness: 0.09em;
  text-underline-offset: 0.18em;
  cursor: pointer;
}
.consent[data-consent] {
  inset-inline: clamp(0.75rem, 3vw, 2rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-rows: auto auto;
  column-gap: 1.25rem;
  max-inline-size: var(--measure);
  max-block-size: min(70svh, 28rem);
  overflow: auto;
  margin-inline: auto;
}
.consent[data-consent] p {
  margin-block-end: 0;
}
.consent-actions {
  grid-column: 2;
  grid-row: 1 / 3;
  align-self: center;
}
:focus-visible {
  scroll-margin-block-end: min(70svh, 28rem);
}
@media (max-width: 58rem) {
  .article-aside {
    order: -1;
  }
}
@media (max-width: 35rem) {
  .hero {
    gap: 1.75rem;
    padding-block: 2.5rem 3.25rem;
  }
  .hero h1 {
    font-size: clamp(2.4rem, 12vw, 3.4rem);
  }
  .hero-actions {
    margin-block-start: 1.35rem;
  }
  .consent[data-consent] {
    grid-template-columns: 1fr;
  }
  .consent-actions {
    grid-column: 1;
    grid-row: auto;
    margin-block-start: 0.8rem;
  }
}
@media (prefers-reduced-motion: reduce) {
  .button:hover {
    transform: none;
  }
}