/* ============================================
   MZ 세대 친화적 그라데이션 컬러 시스템
   ============================================ */

:root {
  /* Primary Gradients - 메인 그라데이션 */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-primary-light: linear-gradient(135deg, #8b9aff 0%, #a78bfa 100%);
  --gradient-primary-dark: linear-gradient(135deg, #4c63d2 0%, #5a3d91 100%);
  
  /* Secondary Gradients - 보조 그라데이션 */
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-secondary-light: linear-gradient(135deg, #ffa8e5 0%, #ff7a8a 100%);
  --gradient-secondary-dark: linear-gradient(135deg, #d67ae8 0%, #e03d52 100%);
  
  /* Accent Gradients - 강조 그라데이션 */
  --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-accent-warm: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  --gradient-accent-cool: linear-gradient(135deg, #30cfd0 0%, #330867 100%);
  
  /* Success/Free Badge Gradient */
  --gradient-success: linear-gradient(135deg, #00d4aa 0%, #00a085 100%);
  --gradient-success-light: linear-gradient(135deg, #00f5c4 0%, #00c4a0 100%);
  
  /* Warning/Pro Badge Gradient */
  --gradient-warning: linear-gradient(135deg, #ff6b9d 0%, #c44569 100%);
  --gradient-warning-light: linear-gradient(135deg, #ff8fb3 0%, #d65a7f 100%);
  
  /* Info/New Badge Gradient */
  --gradient-info: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-info-light: linear-gradient(135deg, #8b9aff 0%, #a78bfa 100%);
  
  /* Background Gradients */
  --gradient-bg-light: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  --gradient-bg-warm: linear-gradient(135deg, #ffeaa7 0%, #fab1a0 100%);
  --gradient-bg-cool: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
  
  /* Text Colors */
  --text-primary: #1a1a2e;
  --text-secondary: #6c757d;
  --text-light: #ffffff;
  
  /* Shadow Colors */
  --shadow-primary: rgba(102, 126, 234, 0.3);
  --shadow-secondary: rgba(245, 87, 108, 0.3);
  --shadow-accent: rgba(79, 172, 254, 0.3);
}

/* ============================================
   배지 스타일 개선
   ============================================ */

.new-badge {
  display: inline-block;
  background: var(--gradient-info);
  color: #ffffff;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 0.75em;
  margin-right: 6px;
  box-shadow: 0 2px 8px var(--shadow-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  animation: pulse-glow 2s ease-in-out infinite;
  vertical-align: middle;
  line-height: 1.2;
}

.pro-badge {
  display: inline-block;
  background: var(--gradient-warning);
  color: #ffffff;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 10px;
  font-size: 0.55em;
  margin-right: 4px;
  box-shadow: 0 2px 8px var(--shadow-secondary);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  vertical-align: middle;
  line-height: 1.2;
}

.free-badge {
  display: inline-block;
  background: var(--gradient-success);
  color: #ffffff;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 10px;
  font-size: 0.55em;
  margin-right: 4px;
  box-shadow: 0 2px 8px rgba(0, 212, 170, 0.3);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  vertical-align: middle;
  line-height: 1.2;
}

@keyframes pulse-glow {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.9;
    transform: scale(1.05);
  }
}

/* ============================================
   배너 스타일 개선
   ============================================ */

.banner {
  background: var(--gradient-accent-warm);
  color: var(--text-primary);
  text-align: center;
  padding: 16px;
  font-weight: 600;
  font-size: 16px;
  box-shadow: 0 4px 12px rgba(250, 112, 154, 0.2);
  position: relative;
  overflow: hidden;
}

.banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: shimmer 3s infinite;
}

@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

.banner .highlight {
  font-size: 22px;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
}

/* ============================================
   카드 스타일 개선
   ============================================ */

.card {
  border: none;
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  position: relative;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
}

.card:hover::before {
  opacity: 1;
}

.card-body {
  padding: 1.25rem;
}

.card-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  line-height: 1.4;
}

.card-text {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   버튼 스타일 개선
   ============================================ */

.btn-primary {
  background: var(--gradient-primary);
  border: none;
  color: #ffffff;
  font-weight: 600;
  padding: 10px 24px;
  border-radius: 12px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px var(--shadow-primary);
}

.btn-primary:hover {
  background: var(--gradient-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--shadow-primary);
  color: #ffffff;
}

.btn-secondary {
  background: var(--gradient-bg-light);
  border: none;
  color: var(--text-primary);
  font-weight: 600;
  padding: 10px 24px;
  border-radius: 12px;
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  background: var(--gradient-primary-light);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-warning {
  background: var(--gradient-accent-warm);
  border: none;
  color: var(--text-primary);
  font-weight: 600;
  padding: 10px 24px;
  border-radius: 12px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(250, 112, 154, 0.3);
}

.btn-warning:hover {
  background: var(--gradient-secondary);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--shadow-secondary);
}

.btn-info {
  background: var(--gradient-accent);
  border: none;
  color: #ffffff;
  font-weight: 600;
  padding: 10px 24px;
  border-radius: 12px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px var(--shadow-accent);
}

.btn-info:hover {
  background: var(--gradient-accent-cool);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--shadow-accent);
  color: #ffffff;
}

.btn-success {
  background: var(--gradient-success);
  border: none;
  color: #ffffff;
  font-weight: 600;
  padding: 10px 24px;
  border-radius: 12px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 212, 170, 0.3);
}

.btn-success:hover {
  background: var(--gradient-success-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 212, 170, 0.4);
  color: #ffffff;
}

.btn-dark {
  background: linear-gradient(135deg, #2d3436 0%, #1a1a2e 100%);
  border: none;
  color: #ffffff;
  font-weight: 600;
  padding: 10px 24px;
  border-radius: 12px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.btn-dark:hover {
  background: linear-gradient(135deg, #3d4446 0%, #2a2a3e 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
  color: #ffffff;
}

/* ============================================
   네비게이션 바 개선
   ============================================ */

.navbar-dark.bg-dark {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%) !important;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.navbar-dark .navbar-brand {
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar-dark .nav-link {
  transition: all 0.3s ease;
  border-radius: 8px;
  margin: 0 4px;
  padding: 8px 16px !important;
}

.navbar-dark .nav-link:hover {
  background: rgba(102, 126, 234, 0.2);
  transform: translateY(-2px);
}

.navbar-dark .nav-link.active {
  background: var(--gradient-primary);
  color: #ffffff !important;
}

/* ============================================
   Callout 박스 개선
   ============================================ */

.bd-callout-info {
  border-left-color: transparent;
  background: linear-gradient(90deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.05) 100%);
  border-left: 4px solid;
  border-image: var(--gradient-primary) 1;
}

.bd-callout-warning {
  border-left-color: transparent;
  background: linear-gradient(90deg, rgba(250, 112, 154, 0.1) 0%, rgba(254, 225, 64, 0.05) 100%);
  border-left: 4px solid;
  border-image: var(--gradient-accent-warm) 1;
}

.bd-callout-danger {
  border-left-color: transparent;
  background: linear-gradient(90deg, rgba(245, 87, 108, 0.1) 0%, rgba(196, 69, 105, 0.05) 100%);
  border-left: 4px solid;
  border-image: var(--gradient-warning) 1;
}

/* ============================================
   배경 그라데이션 유틸리티 클래스
   ============================================ */

.bg-gradient-primary {
  background: var(--gradient-primary);
}

.bg-gradient-secondary {
  background: var(--gradient-secondary);
}

.bg-gradient-accent {
  background: var(--gradient-accent);
}

.bg-gradient-success {
  background: var(--gradient-success);
}

.bg-gradient-warm {
  background: var(--gradient-bg-warm);
}

.bg-gradient-cool {
  background: var(--gradient-bg-cool);
}

/* 텍스트 그라데이션 */
.text-gradient-primary {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-gradient-secondary {
  background: var(--gradient-secondary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-gradient-accent {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================
   반응형 조정
   ============================================ */

@media (max-width: 768px) {
  .banner {
    font-size: 14px;
    padding: 12px;
  }
  
  .banner .highlight {
    font-size: 18px;
  }
  
  .card {
    border-radius: 12px;
  }
  
  .btn-primary,
  .btn-secondary,
  .btn-warning,
  .btn-info,
  .btn-success,
  .btn-dark {
    padding: 8px 20px;
    font-size: 14px;
  }
}

/* ============================================
   스크롤바 스타일링 (선택사항)
   ============================================ */

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
  background: var(--gradient-primary);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gradient-primary-dark);
}