:root {
  color-scheme: light dark;
  --pa-bg: #f3f4f1;
  --pa-surface: #ffffff;
  --pa-surface-strong: #e9ebe7;
  --pa-ink: #171b20;
  --pa-muted: #5d646c;
  --pa-line: #d5d9d5;
  --pa-accent: #b8442c;
  --pa-accent-hover: #98351f;
  --pa-accent-ink: #ffffff;
  --pa-inverse-accent: #ff957d;
  --pa-shadow: 0 22px 60px rgb(21 28 35 / 10%);
  --pa-radius: 18px;
  --pa-shell: min(1240px, calc(100vw - 48px));
  --pa-font: Inter, Pretendard, "Noto Sans KR", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --pa-bg: #111416;
    --pa-surface: #191d20;
    --pa-surface-strong: #24292d;
    --pa-ink: #f1f3ef;
    --pa-muted: #b3bbc1;
    --pa-line: #343a3f;
    --pa-accent: #ed755b;
    --pa-accent-hover: #ff9178;
    --pa-accent-ink: #16191c;
    --pa-inverse-accent: #962f1d;
    --pa-shadow: 0 24px 70px rgb(0 0 0 / 28%);
  }

  .pa-brand img {
    filter: grayscale(1) invert(1) brightness(1.35);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  background: var(--pa-bg);
  color: var(--pa-ink);
  font-family: var(--pa-font);
  font-size: 17px;
  line-height: 1.68;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

html[lang="ko"] body {
  word-break: keep-all;
}

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

a {
  color: inherit;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--pa-accent);
}

:focus-visible {
  outline: 3px solid var(--pa-accent);
  outline-offset: 4px;
}

h1,
h2,
h3,
p,
figure,
ol,
ul,
dl {
  margin-top: 0;
}

h1,
h2,
h3 {
  line-height: 1.08;
  letter-spacing: -0.035em;
}

h1 {
  max-width: 16ch;
  margin-bottom: 26px;
  font-size: clamp(3rem, 5.2vw, 5.7rem);
  font-weight: 760;
}

h2 {
  margin-bottom: 24px;
  font-size: clamp(2.05rem, 4vw, 4.2rem);
  font-weight: 730;
}

h3 {
  font-size: clamp(1.28rem, 2.2vw, 2rem);
}

.pa-shell {
  width: var(--pa-shell);
  margin-inline: auto;
}

.pa-narrow {
  max-width: 860px;
}

.pa-skip {
  position: fixed;
  z-index: 1000;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--pa-accent);
  color: var(--pa-accent-ink);
  font-weight: 750;
  transform: translateY(-180%);
}

.pa-skip:focus {
  color: var(--pa-accent-ink);
  transform: translateY(0);
}

.pa-nav {
  position: sticky;
  z-index: 100;
  top: 0;
  border-bottom: 1px solid color-mix(in srgb, var(--pa-line) 72%, transparent);
  background: color-mix(in srgb, var(--pa-bg) 90%, transparent);
  backdrop-filter: blur(16px);
}

.pa-nav-inner {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.pa-brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  color: var(--pa-ink);
  font-size: 0.72rem;
  font-weight: 790;
  line-height: 1.04;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.pa-brand:hover {
  color: var(--pa-ink);
}

.pa-brand img {
  width: 49px;
  height: 32px;
  object-fit: contain;
}

.pa-nav-links {
  display: flex;
  align-items: center;
  gap: clamp(17px, 2vw, 30px);
  white-space: nowrap;
}

.pa-nav-links a {
  font-size: 0.88rem;
  font-weight: 670;
  text-decoration: none;
}

.pa-nav-links a[aria-current="page"] {
  color: var(--pa-accent);
}

.pa-nav-links .pa-nav-cta {
  padding: 9px 15px;
  border: 1px solid var(--pa-accent);
  border-radius: 999px;
  color: var(--pa-accent);
}

.pa-nav-links .pa-nav-cta:hover {
  background: var(--pa-accent);
  color: var(--pa-accent-ink);
}

.pa-mobile-nav {
  display: none;
  position: relative;
}

.pa-mobile-nav summary {
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 760;
  list-style: none;
}

.pa-mobile-nav summary::-webkit-details-marker {
  display: none;
}

.pa-mobile-nav summary::after {
  content: "+";
  margin-left: 8px;
  color: var(--pa-accent);
}

.pa-mobile-nav[open] summary::after {
  content: "-";
}

.pa-mobile-nav nav {
  position: absolute;
  top: 42px;
  right: 0;
  display: grid;
  width: min(290px, calc(100vw - 32px));
  padding: 12px;
  border: 1px solid var(--pa-line);
  border-radius: 14px;
  background: var(--pa-surface);
  box-shadow: var(--pa-shadow);
}

.pa-mobile-nav nav a {
  padding: 11px 12px;
  border-radius: 8px;
  font-weight: 690;
  text-decoration: none;
}

.pa-mobile-nav nav a:hover {
  background: var(--pa-surface-strong);
}

.pa-hero {
  display: grid;
  min-height: calc(100svh - 72px);
  align-items: center;
  padding: clamp(62px, 10vw, 126px) 0;
  overflow: hidden;
}

.pa-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(470px, 1.08fr);
  align-items: center;
  gap: clamp(42px, 7vw, 100px);
}

.pa-eyebrow {
  margin-bottom: 20px;
  color: var(--pa-accent);
  font-size: 0.78rem;
  font-weight: 820;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.pa-hero-sources {
  max-width: 42rem;
  font-size: clamp(0.78rem, 1.05vw, 0.92rem);
  line-height: 1.5;
  text-transform: none;
}

.pa-hero-sources span {
  display: block;
  margin-bottom: 5px;
  color: var(--pa-muted);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.pa-hub-hero h1 {
  max-width: 13ch;
  font-size: clamp(2.9rem, 4.65vw, 5.15rem);
}

.pa-hero-lead {
  max-width: 31rem;
  margin-bottom: 32px;
  color: var(--pa-muted);
  font-size: clamp(1.08rem, 1.6vw, 1.34rem);
  line-height: 1.55;
}

.pa-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.pa-button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border: 1px solid transparent;
  border-radius: 13px;
  font-size: 0.92rem;
  font-weight: 770;
  line-height: 1.25;
  text-decoration: none;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.pa-button:hover {
  transform: translateY(-2px);
}

.pa-primary {
  background: var(--pa-accent);
  color: var(--pa-accent-ink);
}

.pa-primary:hover {
  background: var(--pa-accent-hover);
  color: var(--pa-accent-ink);
}

.pa-secondary {
  border-color: var(--pa-line);
  background: var(--pa-surface);
  color: var(--pa-ink);
}

.pa-secondary:hover {
  border-color: var(--pa-accent);
  color: var(--pa-accent);
}

.pa-hero-image {
  position: relative;
  margin: 0 -9vw 0 0;
}

.pa-hero-image img {
  width: 100%;
  min-height: 580px;
  border-radius: var(--pa-radius) 0 0 var(--pa-radius);
  box-shadow: var(--pa-shadow);
  object-fit: cover;
  object-position: center;
}

.pa-hero-image figcaption {
  position: absolute;
  right: calc(9vw + 22px);
  bottom: 22px;
  max-width: 340px;
  padding: 10px 13px;
  border: 1px solid rgb(255 255 255 / 24%);
  border-radius: 10px;
  background: rgb(13 17 21 / 78%);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 680;
  backdrop-filter: blur(12px);
}

.pa-facts {
  border-block: 1px solid var(--pa-line);
  background: var(--pa-surface);
}

.pa-facts-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.pa-facts-grid > div {
  min-width: 0;
  padding: 24px clamp(16px, 3vw, 38px);
  border-right: 1px solid var(--pa-line);
}

.pa-facts-grid > div:first-child {
  padding-left: 0;
}

.pa-facts-grid > div:last-child {
  border-right: 0;
}

.pa-facts-grid strong,
.pa-facts-grid span {
  display: block;
}

.pa-facts-grid strong {
  margin-bottom: 5px;
  color: var(--pa-accent);
  font-size: clamp(1.25rem, 2.3vw, 2rem);
  line-height: 1.15;
}

.pa-facts-grid span {
  color: var(--pa-muted);
  font-size: 0.82rem;
  line-height: 1.45;
}

.pa-intent-routes {
  padding: clamp(54px, 7vw, 86px) 0;
  border-bottom: 1px solid var(--pa-line);
  background: var(--pa-surface-strong);
}

.pa-intent-head {
  display: grid;
  grid-template-columns: minmax(250px, 0.72fr) minmax(0, 1.28fr);
  gap: 10px clamp(40px, 8vw, 110px);
  align-items: end;
  margin-bottom: 28px;
}

.pa-intent-head .pa-eyebrow {
  grid-column: 1;
  margin-bottom: 0;
}

.pa-intent-head h2 {
  grid-column: 1;
  max-width: 14ch;
  margin-bottom: 0;
  font-size: clamp(1.75rem, 2.8vw, 3rem);
}

.pa-intent-head > p:last-child {
  grid-column: 2;
  grid-row: 1 / span 2;
  max-width: 42rem;
  margin-bottom: 0;
  color: var(--pa-muted);
}

.pa-intent-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--pa-line);
  border-left: 1px solid var(--pa-line);
}

.pa-intent-card {
  position: relative;
  display: grid;
  min-width: 0;
  min-height: 210px;
  align-content: start;
  padding: clamp(24px, 3.5vw, 40px);
  border-right: 1px solid var(--pa-line);
  border-bottom: 1px solid var(--pa-line);
  background: var(--pa-surface);
  color: var(--pa-ink);
  text-decoration: none;
}

.pa-intent-card:first-child {
  border-top: 4px solid var(--pa-accent);
}

.pa-intent-card:hover {
  background: color-mix(in srgb, var(--pa-surface) 88%, var(--pa-accent));
  color: var(--pa-ink);
}

.pa-intent-card small,
.pa-intent-card strong,
.pa-intent-card span {
  display: block;
}

.pa-intent-card small {
  margin-bottom: 12px;
  color: var(--pa-accent);
  font-size: 0.7rem;
  font-weight: 820;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.pa-intent-card strong {
  max-width: 28rem;
  margin-bottom: 10px;
  font-size: clamp(1.12rem, 1.8vw, 1.55rem);
  line-height: 1.25;
}

.pa-intent-card span {
  max-width: 37rem;
  padding-right: 34px;
  color: var(--pa-muted);
  font-size: 0.86rem;
  line-height: 1.55;
}

.pa-intent-card b {
  position: absolute;
  right: clamp(20px, 3vw, 36px);
  bottom: clamp(20px, 3vw, 32px);
  color: var(--pa-accent);
  font-size: 1.3rem;
}

.pa-intent-boundary {
  max-width: 70rem;
  margin: 18px 0 0;
  color: var(--pa-muted);
  font-size: 0.78rem;
}

.pa-research {
  background: var(--pa-ink);
  color: var(--pa-bg);
}

.pa-research-head {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(48px, 9vw, 130px);
  align-items: start;
  margin-bottom: clamp(48px, 7vw, 82px);
}

.pa-research-head h2 {
  max-width: 13ch;
  margin-bottom: 0;
  font-size: clamp(2.05rem, 3.65vw, 3.9rem);
}

.pa-research-intro {
  max-width: 41rem;
  margin-bottom: 20px;
  color: color-mix(in srgb, var(--pa-bg) 86%, transparent);
  font-size: clamp(1.08rem, 1.75vw, 1.42rem);
  font-weight: 610;
  line-height: 1.5;
}

.pa-research-boundary {
  max-width: 43rem;
  margin-bottom: 0;
  color: color-mix(in srgb, var(--pa-bg) 62%, transparent);
  font-size: 0.82rem;
  line-height: 1.6;
}

.pa-research-board {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(360px, 0.82fr);
  border-top: 1px solid color-mix(in srgb, var(--pa-bg) 24%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--pa-bg) 24%, transparent);
}

.pa-research-lead {
  position: relative;
  min-height: 510px;
  overflow: hidden;
  color: #ffffff;
  text-decoration: none;
}

.pa-research-lead::after {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgb(10 13 16 / 8%) 28%, rgb(10 13 16 / 90%) 100%);
  content: "";
}

.pa-research-lead:hover {
  color: #ffffff;
}

.pa-research-lead img {
  width: 100%;
  height: 100%;
  min-height: 510px;
  object-fit: cover;
  transition: transform 240ms ease;
}

.pa-research-lead:hover img {
  transform: scale(1.025);
}

.pa-research-lead-copy {
  position: absolute;
  z-index: 1;
  right: 0;
  bottom: 0;
  left: 0;
  display: block;
  padding: clamp(26px, 4vw, 48px);
}

.pa-research-lead-copy small,
.pa-research-lead-copy strong,
.pa-research-lead-copy > span,
.pa-research-lead-copy b {
  display: block;
}

.pa-research-lead-copy small {
  margin-bottom: 11px;
  color: #ffb5a4;
  font-size: 0.72rem;
  font-weight: 810;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.pa-research-lead-copy strong {
  margin-bottom: 9px;
  font-size: clamp(2.1rem, 4vw, 4rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

.pa-research-lead-copy > span {
  max-width: 30rem;
  color: rgb(255 255 255 / 78%);
  font-size: 0.95rem;
}

.pa-research-lead-copy b {
  margin-top: 22px;
  font-size: 0.82rem;
}

.pa-research-index {
  display: grid;
  padding: 0 0 0 clamp(26px, 4vw, 54px);
  margin: 0;
  list-style: none;
}

.pa-research-index li {
  display: grid;
  border-bottom: 1px solid color-mix(in srgb, var(--pa-bg) 18%, transparent);
}

.pa-research-index li:last-child {
  border-bottom: 0;
}

.pa-research-index a {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  padding: 24px 0;
  color: var(--pa-bg);
  text-decoration: none;
}

.pa-research-index a:hover {
  color: var(--pa-bg);
}

.pa-research-number {
  align-self: start;
  padding-top: 2px;
  color: var(--pa-inverse-accent);
  font-size: 0.72rem;
  font-weight: 810;
}

.pa-research-row-copy,
.pa-research-row-copy small,
.pa-research-row-copy strong,
.pa-research-row-copy > span {
  display: block;
}

.pa-research-row-copy small {
  margin-bottom: 4px;
  color: color-mix(in srgb, var(--pa-bg) 58%, transparent);
  font-size: 0.68rem;
  font-weight: 760;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.pa-research-row-copy strong {
  margin-bottom: 3px;
  font-size: clamp(1.08rem, 1.6vw, 1.35rem);
  line-height: 1.2;
}

.pa-research-row-copy > span {
  color: color-mix(in srgb, var(--pa-bg) 68%, transparent);
  font-size: 0.76rem;
  line-height: 1.45;
}

.pa-research-index b {
  color: var(--pa-inverse-accent);
  font-size: 1.2rem;
  transition: transform 160ms ease;
}

.pa-research-index a:hover b {
  transform: translateX(4px);
}

.pa-section {
  padding: clamp(86px, 11vw, 150px) 0;
}

.pa-section-lead,
.pa-path-intro {
  max-width: 760px;
  margin-bottom: 54px;
  color: var(--pa-muted);
  font-size: clamp(1rem, 1.5vw, 1.24rem);
}

.pa-answer-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(50px, 9vw, 130px);
}

.pa-answer-grid h2 {
  font-size: clamp(2rem, 3.4vw, 3.6rem);
}

.pa-answer-grid > div {
  padding-top: 7px;
}

.pa-answer-grid > div > p:last-child {
  color: var(--pa-muted);
}

.pa-direct-answer {
  margin-bottom: 24px;
  font-size: clamp(1.3rem, 2.25vw, 2rem);
  font-weight: 640;
  line-height: 1.45;
  letter-spacing: -0.02em;
}

.pa-path {
  background: var(--pa-ink);
  color: var(--pa-bg);
}

.pa-path .pa-path-intro {
  color: color-mix(in srgb, var(--pa-bg) 70%, transparent);
}

.pa-path ol {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  padding: 0;
  border-top: 1px solid color-mix(in srgb, var(--pa-bg) 25%, transparent);
  list-style: none;
  counter-reset: path;
}

.pa-path li {
  position: relative;
  min-height: 190px;
  padding: 30px 24px 20px 0;
  border-right: 1px solid color-mix(in srgb, var(--pa-bg) 18%, transparent);
  counter-increment: path;
}

.pa-path li:not(:first-child) {
  padding-left: 24px;
}

.pa-path li:last-child {
  border-right: 0;
}

.pa-path li::before {
  content: "0" counter(path);
  display: block;
  margin-bottom: 30px;
  color: var(--pa-inverse-accent);
  font-size: 0.78rem;
  font-weight: 820;
}

.pa-path li strong,
.pa-path li span {
  display: block;
}

.pa-path li strong {
  margin-bottom: 10px;
  font-size: 1.04rem;
}

.pa-path li span {
  color: color-mix(in srgb, var(--pa-bg) 67%, transparent);
  font-size: 0.82rem;
  line-height: 1.55;
}

.pa-courses {
  padding-bottom: 70px;
}

.pa-tier {
  display: grid;
  grid-template-columns: minmax(220px, 0.36fr) minmax(0, 1fr);
  gap: clamp(34px, 6vw, 90px);
  padding: 70px 0;
  border-top: 1px solid var(--pa-line);
}

.pa-tier-head {
  position: sticky;
  top: 100px;
  align-self: start;
}

.pa-tier-head h3 {
  margin-bottom: 15px;
}

.pa-tier-head p {
  color: var(--pa-muted);
  font-size: 0.92rem;
}

.pa-course-list {
  display: grid;
  gap: 0;
}

.pa-course-row {
  display: grid;
  grid-template-columns: minmax(170px, 0.46fr) 90px minmax(0, 1fr);
  gap: 25px;
  padding: 0 0 46px;
  margin-bottom: 46px;
  border-bottom: 1px solid var(--pa-line);
}

.pa-course-row:last-child {
  margin-bottom: 0;
}

.pa-course-thumb {
  align-self: start;
  overflow: hidden;
  border-radius: 13px;
  background: var(--pa-surface-strong);
}

.pa-course-thumb img {
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  transition: transform 220ms ease;
}

.pa-course-thumb:hover img {
  transform: scale(1.025);
}

.pa-course-index span,
.pa-course-index small {
  display: block;
}

.pa-course-index span {
  margin-bottom: 10px;
  color: var(--pa-accent);
  font-size: 1.55rem;
  font-weight: 780;
}

.pa-course-index small {
  color: var(--pa-muted);
  font-size: 0.7rem;
  line-height: 1.4;
}

.pa-course-source {
  margin-bottom: 10px;
  color: var(--pa-accent);
  font-size: 0.73rem;
  font-weight: 790;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.pa-course-copy h3 {
  margin-bottom: 15px;
}

.pa-course-copy h3 a {
  text-decoration: none;
}

.pa-course-copy > p:not(.pa-course-source) {
  color: var(--pa-muted);
  font-size: 0.92rem;
}

.pa-course-copy > .pa-course-build {
  display: grid;
  grid-template-columns: 138px minmax(0, 1fr);
  gap: 12px;
  padding: 13px 15px;
  border-left: 3px solid var(--pa-accent);
  border-radius: 0 9px 9px 0;
  background: var(--pa-surface-strong);
  color: var(--pa-ink);
}

.pa-course-build strong {
  color: var(--pa-accent);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.pa-course-build span {
  line-height: 1.45;
}

.pa-course-copy dl {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-bottom: 20px;
}

.pa-course-copy dl div {
  display: flex;
  gap: 6px;
  font-size: 0.76rem;
}

.pa-course-copy dt {
  color: var(--pa-muted);
}

.pa-course-copy dd {
  margin: 0;
  font-weight: 690;
}

.pa-text-link {
  color: var(--pa-accent);
  font-size: 0.88rem;
  font-weight: 780;
  text-decoration: none;
}

.pa-chooser,
.pa-evidence,
.pa-related,
.pa-faq {
  background: var(--pa-surface);
}

.pa-chooser-grid,
.pa-project-grid,
.pa-evidence-grid,
.pa-sources-grid,
.pa-boundary-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  align-items: center;
  gap: clamp(50px, 9vw, 125px);
}

.pa-detail-hero-grid > *,
.pa-chooser-grid > *,
.pa-project-grid > *,
.pa-evidence-grid > *,
.pa-sources-grid > *,
.pa-boundary-grid > * {
  min-width: 0;
}

.pa-evidence-grid p,
.pa-boundary-grid dd,
.pa-faq-list p {
  overflow-wrap: anywhere;
}

.pa-chooser dl,
.pa-boundary-grid dl {
  margin-bottom: 0;
}

.pa-chooser dl > div,
.pa-boundary-grid dl > div {
  display: grid;
  grid-template-columns: minmax(130px, 0.36fr) minmax(0, 1fr);
  gap: 24px;
  padding: 15px 0;
  border-top: 1px solid var(--pa-line);
}

.pa-chooser dt,
.pa-boundary-grid dt {
  color: var(--pa-muted);
  font-size: 0.84rem;
  font-weight: 650;
}

.pa-chooser dd,
.pa-boundary-grid dd {
  margin: 0;
  font-weight: 650;
}

.pa-chooser figure,
.pa-project-grid figure {
  margin: 0;
}

.pa-chooser figure img,
.pa-project-grid figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  border-radius: var(--pa-radius);
  box-shadow: var(--pa-shadow);
  object-fit: cover;
}

.pa-sources-grid {
  align-items: start;
}

.pa-sources-grid p {
  color: var(--pa-muted);
}

.pa-sources-grid ul {
  margin-bottom: 0;
  padding: 0;
  list-style: none;
}

.pa-sources-grid li {
  padding: 17px 0;
  border-top: 1px solid var(--pa-line);
  font-weight: 650;
}

.pa-faq-list {
  border-top: 1px solid var(--pa-line);
}

.pa-faq-list details {
  border-bottom: 1px solid var(--pa-line);
}

.pa-faq-list summary {
  position: relative;
  cursor: pointer;
  padding: 23px 50px 23px 0;
  font-weight: 720;
  list-style: none;
}

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

.pa-faq-list summary::after {
  content: "+";
  position: absolute;
  top: 17px;
  right: 4px;
  color: var(--pa-accent);
  font-size: 1.55rem;
  font-weight: 400;
}

.pa-faq-list details[open] summary::after {
  content: "-";
}

.pa-faq-list details p {
  max-width: 760px;
  padding: 0 40px 22px 0;
  color: var(--pa-muted);
}

.pa-final-cta {
  padding: clamp(90px, 13vw, 180px) 0;
  background: var(--pa-accent);
  color: var(--pa-accent-ink);
  text-align: center;
}

.pa-final-cta h2 {
  max-width: 800px;
  margin-inline: auto;
}

.pa-final-cta p {
  max-width: 660px;
  margin: 0 auto 30px;
}

.pa-final-cta .pa-primary {
  background: var(--pa-accent-ink);
  color: var(--pa-accent);
}

.pa-final-cta .pa-primary:hover {
  background: color-mix(in srgb, var(--pa-accent-ink) 88%, transparent);
  color: var(--pa-accent);
}

.pa-footer {
  padding: 55px 0;
  background: var(--pa-ink);
  color: var(--pa-bg);
}

.pa-footer-grid {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) auto auto;
  gap: 60px;
  align-items: start;
}

.pa-footer strong {
  font-size: 1.05rem;
}

.pa-footer p {
  margin: 10px 0 0;
  color: color-mix(in srgb, var(--pa-bg) 68%, transparent);
  font-size: 0.79rem;
}

.pa-footer nav {
  display: grid;
  gap: 8px;
}

.pa-footer a {
  color: var(--pa-bg);
  font-size: 0.82rem;
  text-decoration: none;
}

.pa-footer-source {
  margin-top: 0 !important;
  text-align: right;
}

.pa-detail-hero {
  display: block;
  min-height: auto;
  padding-top: clamp(42px, 5vw, 64px);
  padding-bottom: clamp(42px, 5vw, 64px);
}

.pa-back {
  display: inline-block;
  margin-bottom: 24px;
  color: var(--pa-muted);
  font-size: 0.83rem;
  font-weight: 720;
  text-decoration: none;
}

.pa-detail-title {
  display: grid;
  grid-template-columns: minmax(260px, 0.54fr) minmax(0, 1.46fr);
  gap: clamp(42px, 8vw, 120px);
  align-items: end;
  padding-top: clamp(22px, 3vw, 34px);
  margin-bottom: clamp(34px, 4vw, 48px);
  border-top: 1px solid var(--pa-line);
}

.pa-detail-title h1 {
  max-width: 920px;
  margin-bottom: 0;
  font-size: clamp(2.55rem, 4.15vw, 4.35rem);
}

.pa-detail-source {
  margin-bottom: 4px;
}

.pa-detail-source span,
.pa-detail-source strong,
.pa-detail-source small {
  display: block;
}

.pa-detail-source span {
  margin-bottom: 11px;
  color: var(--pa-muted);
  font-size: 0.67rem;
  font-weight: 810;
  letter-spacing: 0.14em;
  line-height: 1.4;
  text-transform: uppercase;
}

.pa-detail-source strong {
  max-width: 17ch;
  margin-bottom: 9px;
  color: var(--pa-accent);
  font-size: clamp(1.8rem, 2.75vw, 2.9rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
  text-wrap: balance;
}

.pa-detail-source small {
  max-width: 29rem;
  color: var(--pa-muted);
  font-size: 0.78rem;
  font-weight: 650;
  line-height: 1.5;
}

.pa-title-mobile {
  display: none;
}

.pa-detail-hero-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.72fr) minmax(500px, 1.28fr);
  gap: clamp(46px, 8vw, 120px);
  align-items: center;
}

.pa-detail-hero .pa-hero-copy {
  padding-bottom: 0;
}

.pa-detail-hero-note {
  display: grid;
  grid-template-columns: minmax(280px, 0.72fr) minmax(500px, 1.28fr);
  gap: clamp(46px, 8vw, 120px);
  padding-top: 18px;
  margin-top: 30px;
  border-top: 1px solid var(--pa-line);
}

.pa-detail-hero-note strong,
.pa-detail-hero-note p {
  margin: 0;
}

.pa-detail-hero-note strong {
  color: var(--pa-accent);
  font-size: 0.72rem;
  font-weight: 790;
  letter-spacing: 0.04em;
  line-height: 1.5;
}

.pa-detail-hero-note p {
  color: var(--pa-muted);
  font-size: 0.72rem;
  line-height: 1.55;
}

.pa-source-visual {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--pa-line);
  border-radius: var(--pa-radius);
  background: var(--pa-surface);
  box-shadow: var(--pa-shadow);
}

.pa-source-visual img {
  width: 100%;
  aspect-ratio: 2 / 1;
  background: var(--pa-surface-strong);
  object-fit: cover;
}

.pa-source-visual figcaption {
  display: flex;
  min-width: 0;
  justify-content: space-between;
  gap: 18px;
  padding: 12px 15px;
  color: var(--pa-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.68rem;
}

.pa-source-visual figcaption a {
  overflow: hidden;
  color: var(--pa-ink);
  font-weight: 680;
  text-decoration: none;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.pa-project {
  background: var(--pa-ink);
  color: var(--pa-bg);
}

.pa-project-grid {
  grid-template-columns: minmax(360px, 0.92fr) minmax(0, 1.08fr);
}

.pa-project-copy > p:not(.pa-project-result) {
  color: color-mix(in srgb, var(--pa-bg) 70%, transparent);
}

.pa-project-result {
  font-size: clamp(1.3rem, 2vw, 1.8rem);
  font-weight: 650;
  line-height: 1.45;
}

.pa-build-plan {
  margin: 28px 0 0;
  border-top: 1px solid color-mix(in srgb, var(--pa-bg) 24%, transparent);
}

.pa-build-plan > div {
  display: grid;
  grid-template-columns: minmax(125px, 0.32fr) minmax(0, 1fr);
  gap: 20px;
  padding: 14px 0;
  border-bottom: 1px solid color-mix(in srgb, var(--pa-bg) 16%, transparent);
}

.pa-build-plan dt {
  color: var(--pa-inverse-accent);
  font-size: 0.76rem;
  font-weight: 800;
}

.pa-build-plan dd {
  margin: 0;
  color: color-mix(in srgb, var(--pa-bg) 82%, transparent);
  font-size: 0.86rem;
  line-height: 1.55;
}

.pa-project-copy h3 {
  margin: 42px 0 18px;
  font-size: 1rem;
  letter-spacing: 0;
}

.pa-project-copy ol {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 20px;
  padding: 0;
  list-style: none;
}

.pa-project-copy li {
  display: flex;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid color-mix(in srgb, var(--pa-bg) 22%, transparent);
}

.pa-project-copy li span {
  color: var(--pa-inverse-accent);
  font-size: 0.72rem;
  font-weight: 800;
}

.pa-project-copy li strong {
  font-size: 0.86rem;
}

.pa-chapter-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--pa-line);
  border-left: 1px solid var(--pa-line);
}

.pa-chapter-grid article {
  min-height: 260px;
  padding: clamp(25px, 4vw, 44px);
  border-right: 1px solid var(--pa-line);
  border-bottom: 1px solid var(--pa-line);
}

.pa-chapter-grid article:nth-child(2),
.pa-chapter-grid article:nth-child(3) {
  background: var(--pa-surface);
}

.pa-chapter-grid h3 {
  margin-bottom: 35px;
}

.pa-chapter-grid ol {
  padding: 0;
  list-style: none;
}

.pa-chapter-grid li {
  display: grid;
  grid-template-columns: 35px minmax(0, 1fr);
  gap: 13px;
  padding: 12px 0;
  border-top: 1px solid var(--pa-line);
}

.pa-chapter-grid li span {
  color: var(--pa-accent);
  font-size: 0.72rem;
  font-weight: 800;
}

.pa-chapter-grid li p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.5;
}

.pa-evidence-grid {
  align-items: center;
}

.pa-evidence-grid > div > p:not(.pa-eyebrow) {
  color: var(--pa-muted);
}

.pa-source-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-top: 30px;
}

.pa-boundaries {
  border-top: 1px solid var(--pa-line);
}

.pa-boundary-grid {
  align-items: start;
}

.pa-boundary-grid aside {
  padding: clamp(28px, 4vw, 46px);
  border-left: 4px solid var(--pa-accent);
  background: var(--pa-surface-strong);
}

.pa-boundary-grid aside h3 {
  font-size: 1.38rem;
}

.pa-boundary-grid aside p {
  color: var(--pa-muted);
  font-size: 0.9rem;
}

.pa-boundary-grid aside p:last-child {
  margin-bottom: 0;
}

.pa-related-list {
  border-top: 1px solid var(--pa-line);
}

.pa-related-list > a {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr) auto;
  align-items: center;
  gap: 30px;
  padding: 22px 0;
  border-bottom: 1px solid var(--pa-line);
  text-decoration: none;
}

.pa-related-list img {
  width: 150px;
  height: 75px;
  aspect-ratio: 2 / 1;
  border-radius: 9px;
  object-fit: cover;
}

.pa-related-list span,
.pa-related-list strong,
.pa-related-list small {
  display: block;
}

.pa-related-list strong {
  margin-bottom: 5px;
  font-size: 1.02rem;
}

.pa-related-list small {
  color: var(--pa-muted);
  font-size: 0.79rem;
  line-height: 1.5;
}

.pa-related-list b {
  color: var(--pa-accent);
  font-size: 1.4rem;
}

@media (max-width: 1040px) {
  .pa-nav-links {
    gap: 15px;
  }

  .pa-nav-links a {
    font-size: 0.8rem;
  }

  .pa-hero-grid,
  .pa-detail-hero-grid {
    grid-template-columns: minmax(0, 0.88fr) minmax(420px, 1.12fr);
    gap: 42px;
  }

  .pa-detail-title,
  .pa-detail-hero-note {
    gap: 42px;
  }

  .pa-course-row {
    grid-template-columns: 150px minmax(0, 1fr);
  }

  .pa-course-index {
    grid-column: 1;
    grid-row: 2;
  }

  .pa-course-copy {
    grid-column: 2;
    grid-row: 1 / span 2;
  }
}

@media (max-width: 840px) {
  :root {
    --pa-shell: min(100% - 32px, 680px);
  }

  body {
    font-size: 16px;
  }

  .pa-nav-links {
    display: none;
  }

  .pa-mobile-nav {
    display: block;
  }

  .pa-hero {
    min-height: auto;
    padding-top: 62px;
  }

  .pa-hero-grid,
  .pa-detail-hero-grid,
  .pa-detail-title,
  .pa-detail-hero-note,
  .pa-intent-head,
  .pa-intent-grid,
  .pa-answer-grid,
  .pa-research-head,
  .pa-research-board,
  .pa-tier,
  .pa-chooser-grid,
  .pa-project-grid,
  .pa-evidence-grid,
  .pa-sources-grid,
  .pa-boundary-grid {
    grid-template-columns: 1fr;
  }

  .pa-intent-head {
    gap: 9px;
  }

  .pa-intent-head .pa-eyebrow,
  .pa-intent-head h2,
  .pa-intent-head > p:last-child {
    grid-column: 1;
    grid-row: auto;
  }

  .pa-intent-head > p:last-child {
    margin-top: 8px;
  }

  .pa-intent-card {
    min-height: 0;
  }

  .pa-title-full {
    display: none;
  }

  .pa-title-mobile {
    display: inline;
  }

  .pa-hero-grid,
  .pa-detail-hero-grid {
    gap: 44px;
  }

  .pa-detail-title {
    gap: 22px;
    align-items: start;
    margin-bottom: 36px;
  }

  .pa-detail-source strong {
    max-width: none;
  }

  .pa-detail-hero-note {
    gap: 10px;
    margin-top: 26px;
  }

  .pa-hero-image {
    margin: 0;
  }

  .pa-hero-image img {
    height: min(125vw, 560px);
    min-height: 0;
    border-radius: var(--pa-radius);
  }

  .pa-facts-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .pa-research-lead,
  .pa-research-lead img {
    min-height: 440px;
  }

  .pa-research-index {
    padding-left: 0;
  }

  .pa-facts-grid > div,
  .pa-facts-grid > div:first-child {
    padding: 19px 16px;
    border-right: 1px solid var(--pa-line);
    border-bottom: 1px solid var(--pa-line);
  }

  .pa-facts-grid > div:nth-child(2n) {
    border-right: 0;
  }

  .pa-facts-grid > div:nth-last-child(-n + 2) {
    border-bottom: 0;
  }

  .pa-path ol {
    grid-template-columns: 1fr;
  }

  .pa-path li,
  .pa-path li:not(:first-child) {
    min-height: 0;
    padding: 22px 0;
    border-right: 0;
    border-bottom: 1px solid color-mix(in srgb, var(--pa-bg) 18%, transparent);
  }

  .pa-path li::before {
    margin-bottom: 8px;
  }

  .pa-tier {
    padding: 55px 0;
  }

  .pa-tier-head {
    position: static;
  }

  .pa-course-row {
    grid-template-columns: 120px minmax(0, 1fr);
  }

  .pa-course-copy {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .pa-chapter-grid {
    grid-template-columns: 1fr;
  }

  .pa-chapter-grid article:nth-child(2),
  .pa-chapter-grid article:nth-child(3) {
    background: transparent;
  }

  .pa-chapter-grid article:nth-child(even) {
    background: var(--pa-surface);
  }

  .pa-footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .pa-footer-source {
    grid-column: 1 / -1;
    text-align: left;
  }
}

@media (max-width: 560px) {
  h1 {
    font-size: clamp(2.65rem, 11vw, 3.5rem);
  }

  h2 {
    font-size: clamp(1.95rem, 10vw, 3.25rem);
  }

  .pa-brand span {
    display: none;
  }

  .pa-actions {
    display: grid;
  }

  .pa-hub-hero h1 {
    font-size: clamp(2.45rem, 10.5vw, 3.4rem);
  }

  .pa-button {
    width: 100%;
  }

  .pa-hero-image figcaption {
    position: static;
    max-width: none;
    border: 0;
    border-radius: 0 0 var(--pa-radius) var(--pa-radius);
  }

  .pa-research-lead,
  .pa-research-lead img {
    min-height: 360px;
  }

  .pa-research-index a {
    grid-template-columns: 34px minmax(0, 1fr) auto;
    gap: 11px;
  }

  .pa-course-row {
    grid-template-columns: 1fr;
    gap: 17px;
  }

  .pa-course-thumb,
  .pa-course-index,
  .pa-course-copy {
    grid-column: 1;
    grid-row: auto;
  }

  .pa-course-index {
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .pa-course-index span {
    margin: 0;
  }

  .pa-course-index small {
    max-width: 150px;
  }

  .pa-chooser dl > div,
  .pa-boundary-grid dl > div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .pa-project-copy ol {
    grid-template-columns: 1fr;
  }

  .pa-course-copy > .pa-course-build,
  .pa-build-plan > div {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .pa-source-visual figcaption {
    display: grid;
  }

  .pa-related-list > a {
    grid-template-columns: 96px minmax(0, 1fr) auto;
    gap: 14px;
  }

  .pa-related-list img {
    width: 96px;
    height: 48px;
  }

  .pa-related-list small {
    display: none;
  }

  .pa-footer-grid {
    grid-template-columns: 1fr;
    gap: 34px;
  }
}

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

  .pa-button,
  .pa-course-thumb img,
  .pa-research-lead img,
  .pa-research-index b {
    transition: none;
  }
}

@media print {
  .pa-nav,
  .pa-actions,
  .pa-final-cta,
  .pa-footer {
    display: none;
  }

  .pa-section,
  .pa-hero {
    min-height: 0;
    padding: 28px 0;
  }
}