/* =========================================================
   BASE
   ========================================================= */

:root {
  --text: #172033;
  --muted: #667085;
  --accent: #3157d5;
  --background: #ffffff;
  --background-alt: #f7f8fb;
  --border: #e2e6ee;
  --placeholder: #f1f3f7;

  --max-width: 1100px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    Inter,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    sans-serif;

  color: var(--text);
  background: var(--background);
  line-height: 1.65;
}

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

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: min(90%, var(--max-width));
  margin: 0 auto;
}

/* =========================================================
   TYPOGRAPHY
   ========================================================= */

h1,
h2,
h3 {
  line-height: 1.15;
  margin-top: 0;
}

h1 {
  margin-bottom: 28px;
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  letter-spacing: -0.055em;
}

h2 {
  margin-bottom: 24px;
  font-size: clamp(2rem, 4vw, 3.2rem);
  letter-spacing: -0.035em;
}

h3 {
  font-size: 1.25rem;
}

p {
  margin-top: 0;
}

.section-number,
.eyebrow {
  margin-bottom: 16px;

  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-intro {
  max-width: 760px;
  margin-bottom: 48px;

  color: var(--muted);
  font-size: 1.15rem;
}

/* =========================================================
   HERO
   ========================================================= */

.hero {
  min-height: 100vh;
  padding: 120px 0 90px;

  display: flex;
  align-items: center;
}

.hero-content {
  text-align: center;
}

.hero .eyebrow {
  margin-bottom: 24px;
}

.hero-question {
  max-width: 760px;
  margin: 0 auto 20px;

  font-size: clamp(1.35rem, 2.5vw, 1.8rem);
  font-weight: 500;
}

.hero-description {
  max-width: 720px;
  margin: 0 auto 36px;

  color: var(--muted);
  font-size: 1.05rem;
}

.hero-links {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;

  margin-bottom: 64px;
}

.hero-authors {
  margin: 1rem 0 1.5rem;
  font-size: 1rem;
  color: #6b7280;
  line-height: 1.6;
}

/* =========================================================
   BUTTONS
   ========================================================= */

.button {
  display: inline-block;
  padding: 11px 22px;

  border: 1px solid var(--text);
  border-radius: 7px;

  font-weight: 600;

  transition:
    transform 0.15s ease,
    opacity 0.15s ease;
}

.button:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.button.primary {
  color: white;
  background: var(--text);
}

.button.secondary {
  color: var(--text);
  background: transparent;
}

/* =========================================================
   SECTIONS
   ========================================================= */

section {
  padding: 110px 0;
}

section.alternate {
  background: var(--background-alt);
}

/* =========================================================
   IMAGE PLACEHOLDERS

   Replace these divs later with:

   <img src="assets/images/example.png" alt="...">

   or

   <img src="assets/gifs/example.gif" alt="...">
   ========================================================= */

.figure-placeholder {
  width: 100%;

  display: flex;
  align-items: center;
  justify-content: center;

  padding: 32px;

  color: #98a2b3;
  background: var(--placeholder);

  border: 2px dashed #cfd5df;
  border-radius: 12px;

  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.figure-placeholder.large {
  min-height: 430px;
}

.figure-placeholder.wide {
  min-height: 400px;
}

.figure-placeholder.square {
  aspect-ratio: 1 / 1;
}

.figure-placeholder.gif {
  aspect-ratio: 4 / 3;
}

.figure-placeholder.gif.small {
  margin-top: 28px;
}

/* =========================================================
   MOTIVATION
   ========================================================= */

/*
   Motivation now deliberately inherits the shared section typography:
   - standard h2
   - standard .section-intro
   - standard alternate background

   Only its internal two-column storytelling layout is custom.
*/

.motivation-middle {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 64px;
  align-items: stretch;

  margin-top: 48px;
  margin-bottom: 56px;
}

.motivation-questions {
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.motivation-block {
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.motivation-block h3 {
  margin-bottom: 12px;
}

.motivation-block p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.motivation-image-wrapper {
  overflow: hidden;
  border-radius: 12px;
}

.motivation-image {
  width: 100%;
  height: 100%;
  min-height: 360px;

  object-fit: cover;
  object-position: center;

  border-radius: 12px;
}

.motivation-turn {
  max-width: 820px;
  padding-top: 36px;

  border-top: 1px solid var(--border);
}

.motivation-turn p {
  max-width: 760px;
  margin-bottom: 16px;

  color: var(--muted);
  font-size: 1.15rem;
}

.motivation-turn p:last-child {
  margin-bottom: 0;
}

.motivation-turn strong {
  color: var(--accent);
  font-weight: 700;
}
/* =========================================================
   CEREBRAL MICROBLEED BACKGROUND
   ========================================================= */

.cmb-background-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 64px;
  align-items: start;
}

.cmb-background-copy .section-intro {
  margin-bottom: 24px;
}

.cmb-background-note {
  margin-bottom: 48px;

  color: var(--text);
  font-size: 1.1rem;
  font-weight: 600;
}

/* Traits */

.cmb-traits {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.cmb-trait {
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.cmb-trait h3 {
  margin-bottom: 8px;
}

.cmb-trait p {
  margin-bottom: 0;

  color: var(--muted);
  font-size: 1rem;
}

/* MRI */

.cmb-background-figure {
  margin: 0;
}

.cmb-background-image {
  width: 100%;
  height: auto;

  border-radius: 12px;
}

.cmb-background-figure figcaption {
  margin-top: 12px;

  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}

/* Mobile */

@media (max-width: 750px) {
  .cmb-background-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .cmb-background-note {
    margin-bottom: 40px;
  }

  .cmb-traits {
    gap: 24px;
  }
}
/* =========================================================
   REAL VS SYNTH COMPARISON
   ========================================================= */

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 36px;

  margin-top: 52px;
}

.comparison-grid h3 {
  margin-bottom: 14px;
  text-align: center;
}

.detail-link {
  margin-top: 32px;
  text-align: center;
  font-weight: 600;
}

.comparison-image {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
}

/* =========================================================
   MAIN METRICS
   ========================================================= */

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;

  max-width: 850px;
  margin: 50px 0;
}

.metric {
  padding: 36px;

  border-left: 3px solid var(--accent);
}

.metric-value {
  display: block;

  margin-bottom: 8px;

  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 750;
  letter-spacing: -0.06em;
  line-height: 1;
}

.metric-label {
  color: var(--muted);
  font-size: 1rem;
}

/* =========================================================
   MODEL DEPENDENCY
   ========================================================= */

.model-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;

  margin-top: 48px;
}

.model-card {
  padding: 36px;

  background: white;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.model-score {
  display: block;

  margin: 26px 0 8px;

  font-size: clamp(3rem, 6vw, 4.5rem);
  font-weight: 750;
  letter-spacing: -0.05em;
  line-height: 1;
}

.model-card p {
  color: var(--muted);
}

/* =========================================================
   CAPTIONS
   ========================================================= */

.caption {
  max-width: 760px;
  margin: 24px auto 0;

  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

/* =========================================================
   TAKEAWAYS
   ========================================================= */

.takeaways {
  background: var(--text);
  color: white;
}

.takeaways .section-number {
  color: #aabaff;
}

.takeaway-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;

  margin-top: 56px;
}

.takeaway-number {
  display: block;

  margin-bottom: 22px;

  color: #aabaff;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.takeaway-grid h3 {
  font-size: 1.35rem;
}

.takeaway-grid p {
  color: #cbd1dc;
}

/* =========================================================
   PROJECT LINKS
   ========================================================= */

.project-links {
  text-align: center;
}

.project-links p {
  max-width: 600px;
  margin: 0 auto 32px;

  color: var(--muted);
}

.project-links .hero-links {
  margin-bottom: 0;
}

/* =========================================================
   FOOTER
   ========================================================= */

footer {
  padding: 36px 0;

  color: var(--muted);
  border-top: 1px solid var(--border);

  font-size: 0.85rem;
  text-align: center;
}

footer p {
  margin: 0;
}

/* =========================================================
   PREDICTIONS
   ========================================================= */

.prediction-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 52px;
}

.prediction-video {
  display: block;
  width: 100%;
  height: auto;
}

.model-video {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 28px;
  border-radius: 8px;
}

/* =========================================================
   RESPONSIVE
   ========================================================= */

@media (max-width: 900px) {
  .prediction-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 750px) {
  .hero {
    min-height: auto;
    padding: 90px 0 70px;
  }

  section {
    padding: 80px 0;
  }

  .motivation-middle {
    grid-template-columns: 1fr;
    gap: 40px;

    margin-top: 40px;
    margin-bottom: 48px;
  }

  .motivation-questions {
    gap: 32px;
  }

  .motivation-image {
    height: auto;
    min-height: 0;
  }

  .motivation-turn {
    padding-top: 32px;
  }

  .comparison-grid,
  .metric-grid,
  .model-grid,
  .takeaway-grid {
    grid-template-columns: 1fr;
  }

  .metric {
    padding: 28px 20px;
  }

  .figure-placeholder.large,
  .figure-placeholder.wide {
    min-height: 260px;
  }
}

@media (max-width: 650px) {
  .model-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 550px) {
  .prediction-grid {
    grid-template-columns: 1fr;
  }
}