/* ============================================================
   Hero section
   ============================================================ */

.mdx-hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  color: #fff;
  padding: 6rem 0 5rem;
  margin-top: -0.5rem; /* flush under nav tabs */
}

.mdx-hero__backdrop {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 60% 40%, rgba(63, 81, 181, 0.25) 0%, transparent 70%),
    radial-gradient(ellipse 50% 50% at 20% 80%, rgba(26, 35, 126, 0.3) 0%, transparent 60%);
  pointer-events: none;
}

.mdx-hero__content {
  position: relative;
  z-index: 1;
}

.mdx-hero__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
  padding: 0 1.2rem;
}

.mdx-hero__text {
  flex: 1 1 auto;
  max-width: 42rem;
}

.mdx-hero__logo {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mdx-hero__logo img {
  width: 260px;
  height: auto;
  position: relative;
  left: -100px;
  animation: float 6s ease-in-out infinite;
  user-select: none;
}

@keyframes float {
  0%, 100% { transform: translateY(0);     }
  50%       { transform: translateY(-12px); }
}

.mdx-hero__text h1 {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.15;
  margin: 0 0 1.2rem;
  color: #fff;
  letter-spacing: -0.02em;
}

.mdx-hero__text p {
  font-size: 1.15rem;
  line-height: 1.7;
  margin: 0 0 2.2rem;
  color: rgba(255, 255, 255, 0.82);
}

.mdx-hero .md-button {
  margin-right: 0.8rem;
  margin-bottom: 0.6rem;
  font-size: 0.9rem;
  padding: 0.65rem 1.6rem;
  border-radius: 0.25rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.mdx-hero .md-button--primary {
  background-color: var(--md-primary-fg-color);
  border-color: var(--md-primary-fg-color);
  color: var(--md-primary-bg-color);
}

.mdx-hero .md-button:not(.md-button--primary) {
  border-color: rgba(255, 255, 255, 0.5);
  color: rgba(255, 255, 255, 0.9);
  background-color: transparent;
}

.mdx-hero .md-button:not(.md-button--primary):hover {
  border-color: #fff;
  color: #fff;
  background-color: rgba(255, 255, 255, 0.08);
}

/* ============================================================
   Feature cards
   ============================================================ */

.mdx-features {
  padding: 4rem 0;
  background-color: var(--md-default-bg-color);
}

.mdx-features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
  gap: 1.6rem;
  padding: 0 1.2rem;
}

.mdx-feature {
  display: block;
  padding: 1.6rem;
  border-radius: 0.5rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  background-color: var(--md-code-bg-color);
  transition: box-shadow 0.2s, border-color 0.2s, transform 0.2s;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}

.mdx-feature:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
  border-color: var(--md-primary-fg-color);
  transform: translateY(-2px);
  text-decoration: none;
  color: inherit;
}

.mdx-feature__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.8rem;
  height: 2.8rem;
  border-radius: 50%;
  background-color: var(--md-primary-fg-color);
  margin-bottom: 1rem;
}

.mdx-feature__icon svg {
  width: 1.5rem;
  height: 1.5rem;
  fill: var(--md-primary-bg-color);
}

.mdx-feature h2 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.6rem;
  padding: 0;
  color: var(--md-default-fg-color);
  border: none;
}

.mdx-feature p {
  font-size: 0.85rem;
  line-height: 1.65;
  margin: 0;
  color: var(--md-default-fg-color--light);
}

.mdx-feature p code {
  font-size: 0.8rem;
}

/* ============================================================
   Choose Your Path section
   ============================================================ */

.mdx-paths {
  padding: 3rem 0 4rem;
  background-color: var(--md-code-bg-color);
  border-top: 1px solid var(--md-default-fg-color--lightest);
}

.mdx-paths__header {
  padding: 0 1.2rem 1.5rem;
}

.mdx-paths__header h2 {
  margin: 0 0 0.4rem;
}

.mdx-paths__header p {
  margin: 0;
  color: var(--md-default-fg-color--light);
}

.mdx-paths__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(20rem, 1fr));
  gap: 1rem;
  padding: 0 1.2rem;
}

.mdx-path {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.2rem 1.4rem;
  border-radius: 0.5rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  background-color: var(--md-default-bg-color);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.mdx-path:hover {
  border-color: var(--md-primary-fg-color);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
  transform: translateY(-1px);
  text-decoration: none;
  color: inherit;
}

.mdx-path__icon {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  background-color: var(--md-primary-fg-color);
  margin-top: 0.1rem;
}

.mdx-path__icon svg {
  width: 1.2rem;
  height: 1.2rem;
  fill: var(--md-primary-bg-color);
}

.mdx-path strong {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
  color: var(--md-default-fg-color);
}

.mdx-path p {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--md-default-fg-color--light);
}

/* ============================================================
   Architecture section
   ============================================================ */

.mdx-architecture {
  padding: 3rem 0 4rem;
  background-color: var(--md-default-bg-color);
  border-top: 1px solid var(--md-default-fg-color--lightest);
}

.mdx-architecture__header {
  padding: 0 1.2rem 1.5rem;
}

.mdx-architecture__header h2 {
  margin: 0 0 0.4rem;
}

.mdx-architecture__header p {
  margin: 0;
  color: var(--md-default-fg-color--light);
}

.mdx-architecture__frame {
  padding: 0 1.2rem;
}

.mdx-architecture__frame iframe {
  width: 100%;
  height: 820px;
  border: none;
  border-radius: 0.5rem;
  display: block;
}

/* ============================================================
   CTA section
   ============================================================ */

.mdx-cta {
  padding: 4.5rem 0;
  text-align: center;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  color: #fff;
}

.mdx-cta h2 {
  font-size: 2rem;
  font-weight: 700;
  margin: 0 0 0.8rem;
  color: #fff;
  border: none;
}

.mdx-cta p {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.8);
  margin: 0 0 2rem;
}

.mdx-cta .md-button {
  margin: 0 0.5rem 0.6rem;
  font-size: 0.9rem;
  padding: 0.65rem 1.6rem;
  border-radius: 0.25rem;
  font-weight: 600;
}

.mdx-cta .md-button--primary {
  background-color: var(--md-primary-fg-color);
  border-color: var(--md-primary-fg-color);
  color: var(--md-primary-bg-color);
}

.mdx-cta .md-button:not(.md-button--primary) {
  border-color: rgba(255, 255, 255, 0.5);
  color: rgba(255, 255, 255, 0.9);
  background-color: transparent;
}

.mdx-cta .md-button:not(.md-button--primary):hover {
  border-color: #fff;
  color: #fff;
  background-color: rgba(255, 255, 255, 0.08);
}

/* ============================================================
   Hide default article title/content wrapper on home page
   ============================================================ */

[data-md-component="content"] .md-content__inner > h1:first-child {
  display: none;
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 768px) {
  .mdx-hero {
    padding: 4rem 0 3.5rem;
  }

  .mdx-hero__inner {
    flex-direction: column-reverse;
    gap: 2rem;
  }

  .mdx-hero__logo img {
    width: 160px;
  }

  .mdx-hero__text h1 {
    font-size: 2.4rem;
  }

  .mdx-hero__text p {
    font-size: 1rem;
  }

  .mdx-features__grid {
    grid-template-columns: 1fr;
  }

  .mdx-architecture__frame iframe {
    height: 480px;
  }

  .mdx-cta h2 {
    font-size: 1.5rem;
  }
}

/* ============================================================
   Flashcard component
   ============================================================ */

.flashcard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.flashcard {
  perspective: 1000px;
  height: 200px;
  cursor: pointer;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.4, 0.2, 0.2, 1);
}

.flashcard.flipped .flashcard-inner {
  transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.flashcard-front {
  background: var(--md-primary-fg-color);
  color: #fff;
}

.flashcard-front .flashcard-term {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  line-height: 1.3;
}

.flashcard-front .flashcard-hint {
  font-size: 0.8rem;
  opacity: 0.75;
  margin-top: auto;
}

.flashcard-back {
  background: var(--md-code-bg-color, #f5f5f5);
  color: var(--md-typeset-color);
  transform: rotateY(180deg);
  font-size: 0.9rem;
  line-height: 1.6;
}

[data-md-color-scheme="slate"] .flashcard-back {
  background: #1e2029;
}

.flashcard-back ul {
  margin: 0.4rem 0 0 1rem;
  padding: 0;
}

.flashcard-back li {
  margin-bottom: 0.25rem;
}

.flashcard-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: rgba(255,255,255,0.2);
  border-radius: 4px;
  padding: 0.15em 0.5em;
  margin-bottom: 0.6rem;
  width: fit-content;
}

/* Tap-to-flip hint on mobile */
@media (max-width: 600px) {
  .flashcard {
    height: 220px;
  }
}

.fc-code {
  font-family: var(--md-code-font, monospace);
  font-size: 0.85em;
  background: rgba(0,0,0,0.12);
  border-radius: 3px;
  padding: 0.1em 0.35em;
}

[data-md-color-scheme="slate"] .fc-code {
  background: rgba(255,255,255,0.1);
}