/* ============================================================
   Theory Page — 教学理念页 V2 增强
   ============================================================ */

/* 理念页 Hero */
.v2-theory-hero {
  background: var(--gradient-hero);
  padding: var(--space-4xl) 0;
  position: relative;
  overflow: hidden;
  text-align: center;
  color: #fff;
}

.v2-theory-hero h1 {
  font-size: var(--text-5xl);
  font-weight: 800;
  margin-bottom: var(--space-md);
}

.v2-theory-hero p {
  font-size: var(--text-xl);
  opacity: 0.85;
  line-height: 1.8;
}

/* 四位一体增强 */
.v2-four-pillars {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
  position: relative;
}

.v2-four-pillars::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 12.5%;
  width: 75%;
  height: 2px;
  background: linear-gradient(90deg, #4A7CFF, #FF6B4A, #FF8A65, #00D4AA);
  z-index: 0;
}

.v2-pillar {
  text-align: center;
  position: relative;
  z-index: 1;
}

.v2-pillar__icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--pillar-color, var(--color-primary));
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  margin: 0 auto var(--space-md);
  border: 3px solid var(--pillar-color, var(--color-primary));
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.v2-pillar:hover .v2-pillar__icon {
  transform: scale(1.1);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.v2-pillar__title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: var(--space-sm);
}

.v2-pillar__desc {
  font-size: var(--text-base);
  color: var(--color-body);
  line-height: 1.8;
}

/* 响应式 */
@media (max-width: 1024px) {
  .v2-four-pillars {
    grid-template-columns: repeat(2, 1fr);
  }

  .v2-four-pillars::before {
    display: none;
  }
}

@media (max-width: 768px) {
  .v2-four-pillars {
    grid-template-columns: 1fr;
  }

  .v2-theory-hero h1 {
    font-size: var(--text-4xl);
  }
}