/* =======================================================
   Researcher Page Style
   ======================================================= */

/* 1. 글로벌 스타일 및 변수 */
@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard/dist/web/static/pretendard.css');

:root {
    --bg-color: #F8F9FA;
    --card-bg: #FFFFFF;
    --text-color: #212529;
    --text-muted: #495057;
    --accent-color: #4C6EF5;
    --accent-darker: #364FC7;
    --accent-light: #EDF2FF;
    --border-color: #E9ECEF;
    --shadow-color: rgba(0, 0, 0, 0.06);
    --font-primary: 'Pretendard', sans-serif;
}

/* --- 카드 등장 애니메이션 --- */
@keyframes cardFadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

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

/* ▼▼▼ 수정: 푸터 하단 흰색 공간 제거를 위한 설정 1/2 ▼▼▼ */
html {
    height: 100%;
}

/* ▼▼▼ 수정: 푸터 하단 흰색 공간 제거를 위한 설정 2/2 ▼▼▼ */
body {
    font-family: var(--font-primary);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.7;
    word-break: keep-all;
    
    display: flex;
    flex-direction: column;
    min-height: 100%; /* 100vh 대신 100%를 사용하여 html 태그와 연동 */
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease;
}

/* 2. 레이아웃 */
.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.header {
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px var(--shadow-color);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    height: 80px;
    width: auto;
    object-fit: contain;
}

.nav-link {
    color: var(--text-muted);
    font-weight: 600;
    font-size:1.5rem;
    margin-left: 1.75rem;
    padding: 0.5rem;
    border-radius: 6px;
    transition: color 0.3s ease, background-color 0.3s ease;
}

.nav-link:hover, .nav-link:focus {
    color: var(--accent-color);
    background-color: var(--accent-light);
}

main.main {
    padding-top: 4rem;
    padding-bottom: 4rem;
    flex: 1; 
}

.footer {
    text-align: center;
    padding: 2rem 1rem;
    margin-top: auto; 
    background-color: #343a40;
    color: #adb5bd;
    font-size: 0.9rem;
    line-height: 1.8;
}
.footer strong {
    color: #f8f9fa;
}

/* 3. 페이지 콘텐츠 스타일 */
.btn-area {
    text-align: right;
    margin-bottom: 2rem;
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.btn {
    font-weight: 600;
    display: inline-block;
    border: 1px solid transparent;
    padding: 0.7rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    background: var(--accent-color);
    color: #fff;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}
.btn:hover {
    background-color: var(--accent-darker);
    transform: translateY(-2px);
}

.section-block {
    margin-bottom: 4rem;
}

.section-block h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 2rem;
    padding-bottom: 0.75rem;
    border-bottom: 3px solid var(--accent-light);
    display: inline-block;
}

/* ▼▼▼ 수정: 해상도와 상관없이 항상 4열로 고정 ▼▼▼ */
.card-list {
    display: grid;
    /* 4개의 동일한 너비의 열을 생성합니다. */
    grid-template-columns: repeat(4, 1fr); 
    gap: 1.5rem;
}

.grade-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 1rem;
    margin-top: 1.5rem;
}

/* 4. 연구원 카드 디자인 */
.researcher-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 4px 12px var(--shadow-color);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    opacity: 0;
    animation: cardFadeIn 0.5s ease-out forwards;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.researcher-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

.researcher-card-img {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    overflow: hidden;
    margin-bottom: 1.25rem;
    border: 4px solid var(--accent-light);
    flex-shrink: 0;
    background-color: var(--bg-color);
}
.researcher-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.researcher-no-photo {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.researcher-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.researcher-info h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 0.25rem;
}
.researcher-info p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.badge {
    display: inline-block;
    background-color: var(--accent-light);
    color: var(--accent-darker);
    padding: 0.3rem 0.7rem;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 600;
    margin: 0.25rem;
}

.admin-buttons {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    gap: 0.5rem;
}
.btn-sm {
    background-color: var(--bg-color);
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    font-weight: 500;
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
    border-radius: 6px;
}
.btn-sm:hover {
    border-color: var(--text-muted);
    color: var(--text-color);
    background-color: #f1f3f5;
}
.btn-delete:hover {
    border-color: #D94848;
    color: #D94848;
    background-color: #FFF5F5;
}

.no-data, .error {
    padding: 2rem;
    text-align: center;
    color: var(--text-muted);
    background-color: var(--card-bg);
    border-radius: 8px;
    border: 1px dashed var(--border-color);
}