.hero-slider {
  position: relative;
  width: 100vw;
  margin-left: calc(50% - 50vw);
  height: 65vh;
  min-height: 420px;
  max-height: 780px;
  overflow: hidden;
  background: #05060a;
  border-bottom: 1px solid var(--line);
}
.slider-track { position: absolute; inset: 0; }
.slide {
  position: absolute; inset: 0; opacity: 0;
  transition: opacity 0.9s ease; pointer-events: none;
}
.slide.active { opacity: 1; pointer-events: auto; }

.slide-solar {
  background: radial-gradient(ellipse at 50% 100%, rgba(232,185,106,0.08), transparent 70%), #05060a;
}
.slide-solar canvas {
  position: absolute; inset: 0; width: 100%; height: 100%; display: block;
}
.slide-film {
  background: radial-gradient(ellipse at 50% 100%, rgba(125,249,255,0.05), transparent 70%), #05060a;
}
.slide-film canvas#galaxy-canvas {
  position: absolute; inset: 0; width: 100%; height: 100%; display: block;
}
.slide-gallery { background: #0a0908; }
.slide-gallery-grid {
  position: absolute; inset: 0; display: grid;
  grid-template-columns: repeat(3, 1fr); grid-template-rows: repeat(2, 1fr);
  gap: 2px; opacity: 0.5;
}
.slide-gallery-grid img {
  width: 100%; height: 100%; object-fit: cover;
  filter: brightness(0.55) saturate(0.75);
}
.slide-gallery::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(to right, rgba(5,6,10,0.9), rgba(5,6,10,0.3));
  pointer-events: none;
}

.slide-overlay {
  position: absolute; bottom: 3rem; left: 3rem; right: 3rem;
  z-index: 2; max-width: 600px; color: #f0ece4;
}
.slide-label {
  font-family: 'JetBrains Mono', monospace; font-size: 0.68rem;
  color: #e8b96a; letter-spacing: 0.22em; text-transform: uppercase;
  margin-bottom: 0.85rem; display: flex; align-items: center; gap: 0.6rem;
}
.slide-label::before {
  content: ''; width: 24px; height: 1px; background: #e8b96a;
}
.slide-title {
  font-family: 'Instrument Serif', serif; font-size: clamp(1.8rem, 4.5vw, 3.2rem);
  font-weight: 400; letter-spacing: -0.02em; line-height: 1.05; margin-bottom: 0.85rem;
}
.slide-title .italic { color: #e8b96a; font-style: italic; }
.slide-desc {
  font-size: 0.95rem; color: #a8a094; line-height: 1.55;
  max-width: 480px; margin-bottom: 1.35rem;
}
.slide-cta {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.7rem 1.4rem; border: 1px solid #e8b96a; color: #e8b96a;
  text-decoration: none; border-radius: 100px;
  font-family: 'JetBrains Mono', monospace; font-size: 0.78rem;
  letter-spacing: 0.05em; transition: all 0.2s;
}
.slide-cta:hover { background: #e8b96a; color: #05060a; }

.slider-nav {
  position: absolute; bottom: 2rem; right: 3rem; z-index: 3;
  display: flex; gap: 0.5rem;
}
.slider-nav .dot {
  width: 28px; height: 3px; background: rgba(240,236,228,0.25);
  border: none; padding: 0; cursor: pointer; transition: all 0.3s;
  border-radius: 2px;
}
.slider-nav .dot.active { background: #e8b96a; width: 40px; }
.slider-nav .dot:hover { background: rgba(240,236,228,0.5); }
.slider-nav .dot.active:hover { background: #e8b96a; }

.slider-arrow {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 44px; height: 44px; background: rgba(5,6,10,0.5);
  border: 1px solid rgba(240,236,228,0.2); color: #f0ece4;
  border-radius: 50%; cursor: pointer; font-size: 1.5rem; line-height: 1;
  z-index: 3; opacity: 0; transition: all 0.25s;
  backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center; padding: 0;
}
.hero-slider:hover .slider-arrow { opacity: 1; }
.slider-arrow:hover { background: #e8b96a; color: #05060a; border-color: #e8b96a; }
.slider-arrow.prev { left: 1.25rem; }
.slider-arrow.next { right: 1.25rem; }

.hero { min-height: 70vh; padding: 4rem 0 4rem; }

@media (max-width: 768px) {
  .hero-slider { height: 60vh; min-height: 400px; }
  .slide-overlay { bottom: 1.75rem; left: 1.25rem; right: 1.25rem; }
  .slide-label { font-size: 0.6rem; margin-bottom: 0.6rem; }
  .slide-title { font-size: 1.7rem; margin-bottom: 0.6rem; }
  .slide-desc { font-size: 0.82rem; margin-bottom: 1rem; }
  .slide-cta { padding: 0.55rem 1.1rem; font-size: 0.72rem; }
  .slider-nav { bottom: 1rem; right: 1rem; }
  .slider-nav .dot { width: 18px; }
  .slider-nav .dot.active { width: 26px; }
  .slider-arrow { display: none; }
  .hero { min-height: 60vh; padding: 3rem 0 3rem; }
}


/* ═══ ML 101 slide (animated) ═══ */
.slide-ml101 {
  background: radial-gradient(ellipse at 30% 70%, rgba(125,249,255,0.06), transparent 55%),
              radial-gradient(ellipse at 80% 20%, rgba(232,185,106,0.08), transparent 50%),
              #05060a;
}
.slide-ml101 canvas#ml-canvas {
  position: absolute; inset: 0; width: 100%; height: 100%; display: block;
}
/* scattered data points (amber) */
    radial-gradient(circle 2px at 15% 30%, #e8b96a, transparent 3px),
    radial-gradient(circle 2px at 22% 55%, #e8b96a, transparent 3px),
    radial-gradient(circle 2px at 30% 45%, #e8b96a, transparent 3px),
    radial-gradient(circle 2px at 38% 70%, #e8b96a, transparent 3px),
    radial-gradient(circle 2px at 45% 60%, #e8b96a, transparent 3px),
    radial-gradient(circle 2px at 52% 78%, #e8b96a, transparent 3px),
    radial-gradient(circle 2px at 60% 68%, #e8b96a, transparent 3px),
    radial-gradient(circle 2px at 68% 82%, #e8b96a, transparent 3px),
    radial-gradient(circle 2px at 75% 72%, #e8b96a, transparent 3px),
    radial-gradient(circle 2px at 82% 88%, #e8b96a, transparent 3px),
    /* cyan fitted line */
    linear-gradient(115deg, transparent 40%, rgba(125,249,255,0.4) 42%, rgba(125,249,255,0.4) 44%, transparent 46%);
  opacity: 0.7;
}
.slide-ml101::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(0deg, transparent 0, transparent 39px, rgba(125,249,255,0.04) 40px),
    repeating-linear-gradient(90deg, transparent 0, transparent 39px, rgba(125,249,255,0.04) 40px);
  pointer-events: none;
  mask-image: linear-gradient(to top, black 30%, transparent 90%);
}

@media (max-width: 768px) {
  .slide-ml101-bg { opacity: 0.5; }
}




/* ═══ ML 101 slide — cycling description ═══ */
.slide-ml-langs {
  display: inline-flex;
  gap: 4px;
  margin-bottom: 0.6rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
}
.slide-ml-langs span {
  padding: 0.15rem 0.45rem;
  border-radius: 3px;
  color: rgba(240,236,228,0.35);
  border: 1px solid transparent;
  transition: all 0.3s ease;
}
.slide-ml-langs span.active {
  color: #e8b96a;
  border-color: rgba(232,185,106,0.5);
  background: rgba(232,185,106,0.1);
}
#slide-ml-desc {
  min-height: 2.6em;
  transition: opacity 0.4s ease;
}
#slide-ml-desc.fade {
  opacity: 0.3;
}
.slide-ml-desc-fa {
  direction: rtl;
  text-align: right;
  font-family: 'Vazirmatn', sans-serif;
  font-weight: 400;
  line-height: 1.85;
}