/* ���═══════��════════════════════════════════���═════════════════
   TIANX STUDIO — TIANXVISION Product Page
   ════════════════���══════════════════════════════════��═══════ */

/* ─── PRODUCT HERO ─────────────────────────────────────── */

.product-hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  background: var(--surface-dark);
  color: var(--text-inverse);
  position: relative;
  overflow: hidden;
  padding: var(--space-3xl) 0 var(--space-xl);
}

.product-hero__grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-xl);
  align-items: center;
}

.product-hero__mockup {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-light);
  aspect-ratio: 16/10;
}

.product-hero__mockup img,
.product-hero__mockup video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ─── FEATURE GRID ─────────────────────────────────────── */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.feature-card {
  padding: var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--duration-md) var(--ease);
}

.feature-card:hover {
  border-color: var(--signal);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--signal-pale);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--signal);
  margin-bottom: var(--space-sm);
}

.feature-card__title {
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: var(--space-2xs);
}

.feature-card__desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ─── DEMO SECTION ���────────────────────────────────────── */

.demo-section {
  text-align: center;
}

.demo-video {
  max-width: 900px;
  margin: var(--space-md) auto 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-light);
  aspect-ratio: 16/9;
  background: var(--primary-90);
}

.demo-video video,
.demo-video img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ─── ARCHITECTURE ─────────────────────────────────────── */

.arch-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  padding: var(--space-md);
}

.arch-node {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border-light-strong);
  border-radius: var(--radius-md);
  text-align: center;
  min-width: 140px;
  background: rgba(255,255,255,0.03);
}

.arch-node__name {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--signal-light);
  margin-bottom: 4px;
}

.arch-node__desc {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.4);
}

.arch-arrow {
  color: rgba(255,255,255,0.2);
  font-size: 1.5rem;
}

/* ─── FAQ ───────��──────────────────────────────────────── */

.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border);
  padding: var(--space-sm) 0;
}

.faq-item__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-xs) 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  text-align: left;
}

.faq-item__icon {
  flex-shrink: 0;
  transition: transform var(--duration-sm) var(--ease);
  color: var(--text-muted);
}

.faq-item.open .faq-item__icon {
  transform: rotate(45deg);
}

.faq-item__answer {
  display: none;
  padding-bottom: var(--space-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.faq-item.open .faq-item__answer {
  display: block;
}

/* ─── RESPONSIVE ───────────────────────────────────────── */

@media (max-width: 1024px) {
  .product-hero__grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .product-hero { min-height: auto; padding: 8rem 0 var(--space-lg); }
  .feature-grid { grid-template-columns: 1fr; }
  .arch-diagram { flex-direction: column; }
  .arch-arrow { transform: rotate(90deg); }
}