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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif, "Malgun Gothic",
    "Apple SD Gothic Neo", sans-serif;
  line-height: 1.6;
}

/* 네비게이션 바 */
.navbar {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  padding: 15px 0;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: #667eea;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.navbar-brand:hover {
  color: #764ba2;
}

.navbar-menu {
  display: flex;
  list-style: none;
  gap: 30px;
  align-items: center;
}

.navbar-menu li a {
  text-decoration: none;
  color: #333;
  font-weight: 500;
  font-size: 1rem;
  transition: color 0.3s;
  padding: 8px 15px;
  border-radius: 8px;
}

.navbar-menu li a:hover {
  color: #667eea;
  background: rgba(102, 126, 234, 0.1);
}

.navbar-menu li a.active {
  color: white;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* 햄버거 메뉴 (모바일) */
.navbar-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
}

.navbar-toggle span {
  width: 25px;
  height: 3px;
  background: #333;
  border-radius: 2px;
  transition: all 0.3s;
}

/* 페이지 컨테이너 */
.page-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-content {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 40px 20px;
}

/* 페이지 헤더 */
.page-header {
  text-align: center;
  margin-bottom: 40px;
}

.page-header h1 {
  font-size: 2.5rem;
  color: #333;
  margin-bottom: 15px;
}

.page-header .subtitle {
  font-size: 1.2rem;
  color: #666;
}

/* 카드 스타일 */
.card {
  background: white;
  border-radius: 20px;
  padding: 30px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  margin-bottom: 30px;
}

/* 버튼 스타일 */
.btn {
  padding: 12px 30px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s;
  text-decoration: none;
  display: inline-block;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
  background: #f0f0f0;
  color: #333;
}

.btn-secondary:hover {
  background: #e0e0e0;
}

/* 푸터 */
.common-footer {
  background: #2c3e50;
  color: white;
  text-align: center;
  padding: 30px 20px;
  margin-top: 50px;
}

.common-footer p {
  margin: 8px 0;
  font-size: 0.95rem;
}

.common-footer .brand {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
  .navbar-menu {
    position: fixed;
    top: 60px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 60px);
    background: white;
    flex-direction: column;
    padding: 30px;
    gap: 10px;
    transition: left 0.3s;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
  }

  .navbar-menu.active {
    left: 0;
  }

  .navbar-toggle {
    display: flex;
  }

  .navbar-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
  }

  .navbar-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .navbar-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
  }

  .page-header h1 {
    font-size: 2rem;
  }

  .page-header .subtitle {
    font-size: 1rem;
  }
}

/* 유틸리티 클래스 */
.text-center {
  text-align: center;
}

.mt-20 {
  margin-top: 20px;
}

.mt-30 {
  margin-top: 30px;
}

.mb-20 {
  margin-bottom: 20px;
}

.mb-30 {
  margin-bottom: 30px;
}