/* ULTSQL Features Page Styles — Minimalist Monochrome (Strictly Black & White)
   Inspired by Bklit UI & shadcn/ui */

.features-container {
  max-width: 1360px;
  margin: 0 auto;
  padding: 6.75rem 1.5rem 6rem;
  position: relative;
  z-index: 1;
}

.features-hero {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 3.5rem;
}

.features-hero-title {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.features-hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Category Filter Chips */
.features-filter-bar {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

.feature-chip-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.84rem;
  font-weight: 500;
  padding: 0.45rem 1rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.feature-chip-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
  background: var(--bg-surface-hover);
}

.feature-chip-btn.active {
  background: var(--text-primary);
  color: var(--text-inverse);
  border-color: var(--text-primary);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 1.75rem;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 1.6rem;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

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

.feature-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.feature-card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-xs);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
}

.feature-status-badge {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
}

.status-stable {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

.status-beta {
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.status-experimental {
  background: var(--bg-surface);
  color: var(--text-tertiary);
  border: 1px dashed var(--border-subtle);
}

.feature-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.feature-card-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

/* Metric chip */
.feature-metric-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.65rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-primary);
  margin-bottom: 1rem;
}

/* Mini Code Box */
.feature-code-box {
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  padding: 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--text-primary);
  overflow-x: auto;
  margin-bottom: 1rem;
}

.feature-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-subtle);
}

.feature-docs-link {
  font-size: 0.84rem;
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: transform var(--transition-fast);
}

.feature-docs-link:hover {
  transform: translateX(3px);
  text-decoration: underline;
}

/* Architecture Section */
.features-arch-section {
  margin-top: 6rem;
  padding: 4rem 2rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.features-arch-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.features-arch-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 3rem;
}

.features-arch-diagram {
  max-width: 900px;
  margin: 0 auto;
}

/* Matrix Table */
.features-matrix-section {
  margin-top: 6rem;
}

@media (max-width: 768px) {
  .features-container {
    padding-top: 5rem;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
}