/* Tùy chỉnh màu sắc & Gradient */
:root {
  --brand-color: #0072ff;
}

.text-brand {
  color: var(--brand-color) !important;
}

.bg-gradient-primary {
  /* Gradient xanh tươi sáng */
  background: linear-gradient(135deg, #00c6ff 0%, #0072ff 100%);
}

.bg-gradient-card {
  /* Gradient nhẹ cho nền khóa học nâng cao */
  background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
}

.btn-gradient {
  background: linear-gradient(135deg,
      #ff9a9e 0%,
      #fecfef 99%,
      #fecfef 100%);
  color: #333;
  font-weight: bold;
  border: none;
  transition:
    transform 0.3s ease,
    box-shadow 0.3s ease;
}

.btn-gradient:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(255, 154, 158, 0.4);
  color: #000;
}

.hero-section {
  padding: 100px 0 80px 0;
  clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
}

.feature-icon {
  font-size: 2.5rem;
  color: var(--brand-color);
  margin-bottom: 15px;
}

.course-card {
  border: none;
  border-radius: 15px;
  transition: all 0.3s ease;
  overflow: hidden;
}

.course-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.course-badge {
  position: absolute;
  top: 15px;
  right: -35px;
  background: #ff4757;
  color: white;
  padding: 5px 40px;
  transform: rotate(45deg);
  font-weight: bold;
  font-size: 0.8rem;
}

/* Section Cam kết mới */
.commitment-section {
  background: var(--accent-gradient);
  color: #000;
  border-radius: 30px;
  padding: 60px 40px;
  margin-top: -50px;
  position: relative;
  z-index: 10;
}

.commitment-card {
  background: rgba(255, 255, 255, 0.9);
  border: none;
  border-radius: 20px;
  transition: transform 0.3s ease;
}

.commitment-card:hover {
  transform: scale(1.05);
}

.lixi-badge {
  background: #d63031;
  color: white;
  padding: 10px 20px;
  border-radius: 50px;
  display: inline-block;
  font-weight: bold;
  box-shadow: 0 4px 15px rgba(214, 48, 49, 0.3);
}

.btn-register {
  background: #000;
  color: #fff;
  border-radius: 50px;
  padding: 12px 35px;
  font-weight: bold;
  border: 2px solid transparent;
  transition: all 0.3s;
}

.btn-register:hover {
  background: transparent;
  color: #000;
  border-color: #000;
}

.anchor {
  position: absolute;
  margin-top: -80px;
}