@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;500;600;700;800&family=Space+Grotesk:wght@400;500;600;700&family=Exo+2:wght@400;500;600&display=swap');

:root {
--obsidian: #0B0B0F;
--charcoal: #2B2B32;
--red: #E63946;
--pink: #FF4F81;
--cyan: #19D3E6;
--cream: #F4F1EA;
--line: rgba(244, 241, 234, 0.18);
}

* {
box-sizing: border-box;
}

html {
scroll-behavior: smooth;
}

body.perception-page {
margin: 0;
background: var(--obsidian) !important;
color: var(--cream);
font-family: "Space Grotesk", sans-serif;
}

.perception-page img {
display: block;
max-width: 100%;
}

.perception-page a {
color: inherit;
text-decoration: none;
}

.perception-page h1,
.perception-page h2,
.perception-page h3 {
margin-top: 0;
color: var(--cream);
font-family: "Orbitron", sans-serif;
font-weight: 700;
line-height: 1.12;
}

.perception-page p {
font-family: "Exo 2", sans-serif;
line-height: 1.75;
}

/* HEADER — MATCHES THE EXPERIMENTS GRID */

.perception-page .grid-shell {
width: 90%;
max-width: 1440px;
margin-inline: auto;
}

.perception-page .site-header {
position: relative;
z-index: 10;
display: grid;
grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
align-items: center;
gap: 20px;
min-height: 76px;
background: var(--obsidian);
border-bottom: 1px solid var(--line);
}

.perception-page .wordmark {
grid-column: 1;
justify-self: start;
white-space: nowrap;
color: var(--cream);
font-family: "Orbitron", sans-serif;
font-size: 19px;
font-weight: 700;
letter-spacing: -1.2px;
}

.perception-page .wordmark span {
color: var(--red);
}

.perception-page .wordmark sup {
font-size: 9px;
}

.perception-page .site-nav {
grid-column: 2;
justify-self: center;
display: flex;
justify-content: center;
align-items: center;
min-width: 0;
max-width: 100%;
flex-wrap: wrap;
gap: clamp(10px, 1.7vw, 26px);
}

.perception-page .site-nav a {
position: relative;
padding: 10px 0;
color: var(--cream);
font-family: "Orbitron", sans-serif;
font-size: 10px;
font-weight: 400;
letter-spacing: 0.035em;
text-decoration: none;
text-transform: uppercase;
white-space: nowrap;
transition: color 200ms ease;
}

.perception-page .site-nav a::after {
position: absolute;
right: 0;
bottom: 2px;
left: 0;
height: 2px;
background: var(--red);
content: "";
transform: scaleX(0);
transform-origin: left;
transition: transform 200ms ease;
}

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

.perception-page .site-nav a:hover::after,
.perception-page .site-nav a:focus-visible::after,
.perception-page .site-nav a[aria-current="page"]::after {
transform: scaleX(1);
}

.perception-page .header-index {
grid-column: 3;
justify-self: end;
color: var(--cyan);
font-family: "Orbitron", sans-serif;
font-size: 10px;
letter-spacing: 0.035em;
}

/* HERO */

.perception-page .perception-hero {
position: relative;
display: grid;
grid-template-columns: repeat(12, minmax(0, 1fr));
align-items: center;
min-height: clamp(28rem, 37.5vw, 33.75rem);
padding: 90px 7%;
overflow: hidden;
background: #0B0B0F;
background-image: url("../home/images/perception-hero.jpg");
background-position: center;
background-repeat: no-repeat;
background-size: cover;
border-bottom: 1px solid rgba(244, 241, 234, 0.18);
}

.perception-page .hero-copy {
position: relative;
z-index: 1;
grid-column: 1 / 10;
}

.perception-page .eyebrow {
display: inline-block;
margin-bottom: 20px;
color: var(--cyan);
font-family: "Space Grotesk", sans-serif;
font-size: 11px;
font-weight: 700;
letter-spacing: 3px;
text-transform: uppercase;
}

.perception-page .perception-hero h1 {
max-width: 850px;
margin-bottom: 28px;
font-size: clamp(30px, 3.75vw, 54px);
letter-spacing: -0.06em;
}

.perception-page .perception-hero h1 span {
color: var(--pink);
}

.perception-page .perception-hero p {
max-width: 560px;
color: rgba(244, 241, 234, 0.8);
font-size: 17px;
}

/* INTRO */

.perception-page .perception-intro {
display: grid;
grid-template-columns: repeat(12, minmax(0, 1fr));
gap: 28px;
padding: 100px 7%;
background: var(--obsidian);
}

.perception-page .intro-heading {
grid-column: 1 / 6;
}

.perception-page .intro-heading h2 {
max-width: 480px;
font-size: clamp(28px, 3.5vw, 46px);
}

.perception-page .intro-copy {
grid-column: 7 / 13;
align-self: center;
}

.perception-page .intro-copy p {
margin-top: 0;
color: rgba(244, 241, 234, 0.8);
font-size: 16px;
}

/* STUDIES SECTION */

.perception-page .studies-section {
padding: 90px 7% 110px;
background: var(--charcoal);
border-top: 2px solid var(--cyan);
}

.perception-page .studies-heading {
display: flex;
align-items: end;
justify-content: space-between;
gap: 24px;
margin-bottom: 48px;
}

.perception-page .studies-heading h2 {
max-width: 700px;
margin-bottom: 0;
font-size: clamp(30px, 4vw, 52px);
}

.perception-page .studies-heading > p {
color: var(--pink);
font-family: "Space Grotesk", sans-serif;
font-size: 11px;
font-weight: 700;
letter-spacing: 1.5px;
}

/* TWO-COLUMN CARD GRID ON A TWELVE-COLUMN TRACK */

.perception-page .study-grid {
display: grid;
grid-template-columns: repeat(12, minmax(0, 1fr));
gap: clamp(0.75rem, 2vw, 1.75rem);
}

.perception-page .study-card {
grid-column: span 6;
min-width: 0;
overflow: hidden;
background: var(--obsidian);
border: 1px solid rgba(244, 241, 234, 0.14);
transition: border-color 0.25s ease, transform 0.25s ease;
}

.perception-page .study-card:nth-child(4n + 1) {
border-top: 3px solid var(--red);
}

.perception-page .study-card:nth-child(4n + 2) {
border-top: 3px solid var(--cyan);
}

.perception-page .study-card:nth-child(4n + 3) {
border-top: 3px solid var(--pink);
}

.perception-page .study-card:nth-child(4n) {
border-top: 3px solid var(--cyan);
}

.perception-page .study-card:hover {
border-color: var(--pink);
transform: translateY(-5px);
}

.perception-page .study-image {
width: 100%;
aspect-ratio: 4 / 3;
overflow: hidden;
background: var(--obsidian);
}

.perception-page .study-image img {
width: 100%;
height: 100%;
object-fit: contain;
object-position: center;
transition: transform 0.35s ease;
}

.perception-page .study-content {
padding: 28px;
}

.perception-page .study-number {
color: var(--cyan);
font-family: "Orbitron", sans-serif;
font-size: 11px;
letter-spacing: 2px;
}

.perception-page .study-card h3 {
margin: 16px 0;
font-size: clamp(19px, 2vw, 26px);
}

.perception-page .study-card p {
color: rgba(244, 241, 234, 0.78);
font-size: 15px;
}

.perception-page .study-card details {
margin-top: 22px;
padding-top: 18px;
border-top: 1px solid var(--line);
}

.perception-page .study-card summary {
color: var(--pink);
cursor: pointer;
font-family: "Space Grotesk", sans-serif;
font-size: 13px;
font-weight: 700;
}

.perception-page .study-card details[open] summary {
color: var(--cyan);
}

.perception-page .study-card details p {
margin-bottom: 0;
}

/* FINAL CHALLENGE */

.perception-page .perception-challenge {
position: relative;
padding: 110px 7%;
overflow: hidden;
background:
linear-gradient(115deg,
rgba(230, 57, 70, 0.12),
transparent 45%,
rgba(25, 211, 230, 0.1)),
var(--obsidian);
text-align: center;
border-top: 1px solid var(--line);
}

.perception-page .perception-challenge .eyebrow {
color: var(--pink);
}

.perception-page .perception-challenge h2 {
max-width: 850px;
margin: 0 auto 26px;
font-size: clamp(34px, 5vw, 64px);
}

.perception-page .perception-challenge p {
max-width: 650px;
margin: 0 auto 34px;
color: rgba(244, 241, 234, 0.8);
}

.perception-page .challenge-link {
display: inline-block;
padding: 16px 24px;
background: var(--red);
color: var(--cream);
font-family: "Orbitron", sans-serif;
font-size: 11px;
font-weight: 700;
letter-spacing: 1px;
transition: background 0.2s ease, color 0.2s ease;
}

.perception-page .challenge-link:hover {
background: var(--cyan);
color: var(--obsidian);
}

/* FOOTER */

.perception-page .site-footer {
display: grid;
grid-template-columns: repeat(12, minmax(0, 1fr));
align-items: center;
column-gap: clamp(0.75rem, 2vw, 1.75rem);
min-height: 6rem;
padding: 1.5rem 0;
background: var(--obsidian);
border-top: 1px solid var(--line);
}

.perception-page .footer-wordmark {
grid-column: 1 / span 3;
width: fit-content;
justify-self: start;
color: var(--cream);
font-family: "Orbitron", sans-serif;
font-size: 0.95rem;
font-weight: 700;
text-decoration: none;
}

.perception-page .footer-wordmark span {
color: var(--red);
}

.perception-page .footer-copy {
grid-column: 4 / span 6;
margin: 0;
text-align: center;
color: var(--cream);
font-family: "Orbitron", sans-serif;
font-size: 0.85rem;
font-weight: 600;
letter-spacing: 0.06em;
}

.perception-page .footer-back {
grid-column: 10 / span 3;
justify-self: end;
color: var(--cream);
font-family: "Orbitron", sans-serif;
font-size: 0.6rem;
letter-spacing: 0.05em;
text-align: right;
text-transform: uppercase;
}

/* KEYBOARD ACCESSIBILITY */

.perception-page a:focus-visible,
.perception-page summary:focus-visible {
outline: 2px solid var(--cyan);
outline-offset: 5px;
}

/* Consistent section-label typography */

.perception-page .eyebrow,
.perception-page .study-number {
font-family: "Orbitron", sans-serif;
font-size: clamp(0.62rem, 0.7vw, 0.7rem);
font-weight: 600;
letter-spacing: 0.1em;
line-height: 1.6;
text-transform: uppercase;
}

.perception-page .page-identifier {
display: flex;
align-items: center;
gap: 0.5rem;
margin: 0 0 1.25rem;
color: var(--cream);
}

.perception-page .page-identifier .identifier-number {
color: var(--red);
}

.perception-page .page-identifier .identifier-separator {
color: var(--pink);
}

/* REDUCED MOTION */

@media (prefers-reduced-motion: reduce) {
.perception-page *,
.perception-page *::before,
.perception-page *::after {
scroll-behavior: auto !important;
transition: none !important;
}
}