/* 공통 CSS 스타일 - Item Manager 브랜드 색상 */
:root {
  /* 라이트 모드 색상 */
  --primary-color: #26A69A;
  --primary-dark: #00897B;
  --secondary-color: #1E88E5;
  --secondary-dark: #1565C0;
  --accent-color: #00ACC1;
  --text-primary: #212121;
  --text-secondary: #757575;
  --background: #FFFFFF;
  --surface: #F5F5F5;
  --border-color: #E0E0E0;
  --gradient: linear-gradient(135deg, #26A69A 0%, #1E88E5 100%);
}

/* 다크 모드 색상 */
@media (prefers-color-scheme: dark) {
  :root {
    --primary-color: #4DB6AC;
    --primary-dark: #00897B;
    --secondary-color: #42A5F5;
    --secondary-dark: #1976D2;
    --accent-color: #26C6DA;
    --text-primary: #FFFFFF;
    --text-secondary: #B0B0B0;
    --background: #121212;
    --surface: #1E1E1E;
    --border-color: #333333;
  }
}

/* 리셋 스타일 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* 기본 타이포그래피 */
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  margin-bottom: 1rem;
  font-weight: 600;
  line-height: 1.2;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: 1rem;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--primary-dark);
}

/* 컨테이너 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 버튼 스타일 */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(38, 166, 154, 0.3);
}

.btn-secondary {
  background-color: var(--surface);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--border-color);
}

/* 카드 컴포넌트 */
.card {
  background-color: var(--surface);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

/* 네비게이션 */
nav {
  background-color: var(--surface);
  padding: 16px 0;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

nav ul {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 32px;
}

nav a {
  color: var(--text-primary);
  font-weight: 500;
  transition: color 0.3s ease;
}

nav a:hover {
  color: var(--primary-color);
}

/* 푸터 */
footer {
  background-color: var(--surface);
  padding: 40px 0 20px;
  margin-top: 80px;
  border-top: 1px solid var(--border-color);
}

/* 반응형 디자인 */
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
  
  .container {
    padding: 0 16px;
  }
  
  nav ul {
    flex-direction: column;
    gap: 16px;
  }
}