/* 기본 설정 */
body {
    background-color: #E8F1FF;
    font-family: 'Noto Sans KR', sans-serif;
    padding-top: 70px;
}

/* 네비바 */
.navbar {
    min-height: 70px;
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: #90C8FF;
}

.navbar-brand {
    display: flex;
    align-items: center;
    padding: 0;
}

.navbar-brand img {
    width: 80px;
    height: auto;
    object-fit: contain;
}

.navbar-collapse {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
	flex-wrap: nowrap;
}

/* 검색창 */
.custom-search-margin {
    margin-left: 15px;
}

.navbar-collapse form {
    flex: 1 1 250px;
    max-width: 350px;
	width: 100%;
}

/* 드롭다운 */
.dropdown-container {
    position: relative;
    flex: 0 1 200px;
    width: 100%;
    max-width: 300px;
	min-width: 150px;
    margin-left: 10px;
}

.custom-dropdown {
    appearance: none;
    background-color: #fff;
    border: none;
    border-radius: 10px;
    padding: 8px 36px 8px 15px;
    font-size: 15px;
    color: #000;
    width: 100%;
    height: 50px;
    box-shadow: 0 0 0 1px #ccc;
}

.dropdown-arrow {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: #3459a7;
}

.navbar-collapse .dropdown-container {
    margin-left: auto;
}

/* nav-items */
.navbar-nav {
    display: flex;
    align-items: center;
    gap: 10px;
	flex-shrink: 0;
}

.navbar-nav .nav-item .nav-link {
    color: #fff;
    padding: 0.5rem 1rem;
	white-space: nowrap;
}

/* 햄버거 버튼 */
.navbar-toggler {
    border: none;
    padding: 0.25rem 0.5rem;
    position: absolute;
    right: 20px;
    top: 18px;
    z-index: 1300;
}

.navbar-toggler-icon {
    width: 1.8em;
    height: 1.8em;
}

/* 사이드바 */
.sidebar {
    width: 200px;
    background-color: #A7D1FF;
    height: 100%;
    position: fixed;
    top: 95px;
    left: 0;
    padding-top: 20px;
    z-index: -1;
}

.sidebar a {
    display: block;
    padding: 15px 20px;
    color: #fff;
    font-weight: 500;
    text-decoration: none;
}

.sidebar a:hover {
    background-color: #7FBFFF;
    border-radius: 0 10px 10px 0;
}

/* 메인 컨텐츠 */
.main-content {
    margin-left: 200px;
    padding: 30px;
}

/* 모바일 대응 */
@media (max-width: 991px) {
    .navbar-collapse {
        display: none;
        position: fixed;
        top: 95px;
		right: 0;
        width: 100%;
		max-width: 350px;
        background-color: #90C8FF;
        padding: 1rem;
        z-index: 1250;
        flex-direction: column;
		align-items: center;
		justify-content: flex-start;
        gap: 8px;
		border-radius: 0 0 15px 15px;
		box-shadow: 0 4px 8px rgba(0,0,0,0.15);
        border-top: 1px solid rgba(255,255,255,0.2);
		transition: all 0.3s ease;
    }

    .navbar-collapse.show {
        display: flex;
    }
	
	.navbar-collapse form {
		flex: 1 1 100%;
		max-width: 100%;
		width: 100%;
	}
	
	.dropdown-container {
		flex: 1 1 100%;
		max-width: 100%;
		width: 100%;
	}

    .navbar-nav {
		flex-direction: column;
		align-items: flex-start;
		width: 100%;
		gap: 8px;
		flex-shrink: 0;
    }

    .navbar-nav .nav-item {
        width: 100%;
    }

    .navbar-nav .nav-link {
        width: 100%;
		text-align: right;
    }

	.dropdown-container,
    .custom-search-margin {
        width: 100%;
        max-width: 320px;
        margin: 0 auto 8px;
    }
	
	.custom-dropdown {
		height: 45px;
		font-size: 14px;
	}
	
	.input-group .btn {
		font-size: 13px;
		padding: 5px 8px;
	}
}


/* 카드, 버튼 */
.card {
  border-radius: 15px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.category-btn {
  border: none;
  padding: 6px 15px;
  border-radius: 50rem;
  margin-right: 8px;
  margin-bottom: 8px;
  font-weight: bold;
  color: white !important;
  transition: all 0.2s ease-in-out;
  opacity: 0.9;
}

.category-btn:hover {
  opacity: 1;
  transform: translateY(-1px);
}

/* 과목별 색상 */
.category-국어 { background-color: #FF6B35; }
.category-수학 { background-color: #FFD23F; color: #333; }
.category-사회 { background-color: #C4D600; color: #333; }
.category-과학 { background-color: #00A6ED; }
.category-영어 { background-color: #9B5DE5; }

.category-btn.active-category {
  box-shadow: 0 0 0 0.25rem rgba(13,110,253,0.5) !important;
}

/* 기타 구성요소 */
.banner {
  background: linear-gradient(to right, #FFEA9A, #FFF2C0);
  border-radius: 15px;
  padding: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.login-card {
  background: white;
  padding: 40px;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  width: 400px;
  text-align: center;
}

.login-card h2 {
  margin-bottom: 30px;
  font-weight: 700;
}

.login-card .btn-dark {
  width: 100%;
  margin-top: 15px;
}

.login-card .links {
  margin-top: 15px;
  font-size: 14px;
}

.login-card .links a {
  color: #333;
  margin: 0 8px;
  text-decoration: none;
}

.login-card .links a:hover {
  text-decoration: underline;
}