/* ═══════════════════════════════════════════════
   核心能力页面样式
   ═══════════════════════════════════════════════ */

.features-content {
  padding: 80px 0 120px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.feature-card {
  padding: 32px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: all .3s;
}

.feature-card:hover {
  border-color: rgba(99,102,241,0.3);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(99,102,241,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.7;
}

/* ── Feature Detail Section ── */
.feature-details {
  padding: 80px 0;
}

.feature-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 64px;
}

.feature-detail-grid:nth-child(even) {
  direction: rtl;
}

.feature-detail-grid:nth-child(even) > * {
  direction: ltr;
}

.feature-detail-text h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.feature-detail-text p {
  font-size: 15px;
  color: var(--text-dim);
  line-height: 1.8;
  margin-bottom: 20px;
}

.feature-detail-text ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-detail-text li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text);
}

.feature-detail-text li::before {
  content: '✓';
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(34,197,94,0.15);
  color: #22c55e;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  flex-shrink: 0;
}

.feature-detail-visual {
  aspect-ratio: 4/3;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 64px;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
  .feature-detail-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .feature-detail-grid:nth-child(even) {
    direction: ltr;
  }
}