.design-doc-hero {
  width: 100%;
  padding: clamp(3rem, 9vw, 5.5rem) clamp(2rem, 8vw, 7rem);
  background: radial-gradient(circle at top left, rgba(41, 120, 160, 0.35), transparent 55%),
    linear-gradient(135deg, rgba(15, 17, 20, 0.95), rgba(27, 30, 34, 0.85));
  border-bottom: 1px solid var(--border-color);
}

.design-doc-hero__inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.design-doc__eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
}

.design-doc-hero__lede {
  max-width: 65ch;
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.85);
}

.design-doc {
  width: 100%;
  padding: clamp(3rem, 8vw, 5rem) clamp(2rem, 8vw, 7rem) clamp(4rem, 9vw, 6rem);
  display: flex;
  flex-direction: column;
  gap: clamp(3rem, 6vw, 4.5rem);
  background-color: rgba(15, 17, 20, 0.85);
  border-top: 1px solid var(--border-color);
}

.design-doc__section {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.design-doc__section-heading {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 65ch;
}

.design-doc__section-heading > p {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.7);
}

.design-doc__section-body {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.design-doc__section-body > p {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.85);
}

.design-doc__section-body ul {
  list-style: disc;
  padding-left: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.design-doc__card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.5rem, 5vw, 2.5rem);
}

.design-doc-card {
  background: rgba(27, 30, 34, 0.9);
  border: 1px solid var(--border-color);
  border-radius: 1.5rem;
  padding: clamp(1.75rem, 4vw, 2.5rem);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-shadow: 0 18px 45px rgba(5, 6, 8, 0.45);
}

.design-doc-card h3 {
  font-size: 1.25rem;
  margin: 0;
}

.design-doc-card p {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.82);
}

.design-doc-card ul {
  list-style: disc;
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.story-role {
  color: #fc2500;
  font-weight: 600;
}

.design-doc__mockup-figure {
  margin: 0;
  background: rgba(27, 30, 34, 0.9);
  border: 1px solid var(--border-color);
  border-radius: 1.5rem;
  padding: clamp(1.75rem, 4vw, 2.5rem);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-shadow: 0 18px 45px rgba(5, 6, 8, 0.45);
}

.design-doc__mockup-figure img {
  width: 100%;
  border-radius: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  object-fit: cover;
}

.design-doc__mockup-figure figcaption {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.75);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.8rem;
  border-radius: 999px;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border: none;
  background: linear-gradient(135deg, #2978a0, #fc2500);
  color: #ffffff;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(16, 18, 21, 0.55);
}

.button--outline {
  background: transparent;
  border: 1px solid #fc2500;
}

.button--outline:hover {
  background: rgba(252, 37, 0, 0.1);
  box-shadow: none;
}

@media (max-width: 1100px) {
  .design-doc__card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 800px) {
  .design-doc-hero,
  .design-doc {
    padding: clamp(2.5rem, 9vw, 4rem) clamp(1.5rem, 9vw, 3rem);
  }
}

@media (max-width: 640px) {
  .design-doc__card-grid {
    grid-template-columns: 1fr;
  }

  .design-doc-card,
  .design-doc__mockup-figure {
    border-radius: 1.1rem;
    padding: 1.75rem;
  }
}

video {
  width: 100%;
  border-radius: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 18px 45px rgba(5, 6, 8, 0.45);
  background: #000;
}