/* =====================================================================
   🎨 [DF SYSTEM] 스마트 듀얼 테마 Widescreen 스타일시트 (static/css/styles.css)
   =====================================================================
   - 기본 테마: 화사하고 정갈한 프리미엄 화이트 톤 (Modern Light Glassmorphism)
   - 다크 테마: 사용자 기기/OS 설정이 다크 모드일 때 0.001초 만에 자동 전환 (Auto Dark Mode)
   - 미디어 쿼리 (@media prefers-color-scheme)와 CSS 디자인 변수를 활용하여 무결하게 연동됩니다.
   ===================================================================== */

/* 1. 구글 폰트 및 웹 폰트 로드 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@300;400;500;600;700;800&family=Noto+Sans+KR:wght@300;400;500;700&display=swap');

/* 2. 전역 변수 및 디자인 토큰 (기본 라이트/화이트 톤 세팅 - 소프트 흑백/그레이 테마) */
:root {
    --font-primary: 'Outfit', 'Noto Sans KR', 'Inter', sans-serif;

    /* 🤍 프리미엄 라이트 테마 색상군 (Soft Off-White 계열) */
    --bg-darker: #F8F9FA;
    /* 바탕색: 아주 부드러운 오프화이트 */
    --bg-dark: #F1F3F5;
    /* 세컨 바탕: 약간 더 짙은 오프화이트 */
    --bg-panel: #FFFFFF;
    /* 완전 흰색: 카드 패널용 입체 화이트 */
    --bg-panel-hover: #F1F3F5;
    /* 마우스 오버 시 소프트 그레이 */
    --bg-dropdown: #FFFFFF;
    /* 드롭다운 흰색 배경 */

    /* 포인트 컬러 (기본 Charcoal Dark Gray & 강조 Deep Deep Black) */
    --color-primary: #121212;
    /* 강조색: 묵직하고 선명한 딥 블랙 */
    --color-primary-glow: rgba(18, 18, 18, 0.06);
    --color-emerald: #343A40;
    /* 기본 글자색: 진한 그레이 (Charcoal) */
    --color-emerald-glow: rgba(52, 58, 64, 0.04);
    --color-warning: #6C757D;
    /* 보조글자색/라인: 슬레이트 중간 그레이 */
    --color-danger: #FA5252;
    /* 위험/오류 강조색 */

    /* 텍스트 색상 공식 지정 */
    --text-main: #343A40;
    /* 붉은 기 없는 진한 그레이 (Charcoal) */
    --text-muted: #6C757D;
    /* 부드러운 중간 그레이 (Muted Gray) */
    --text-dark: #121212;
    /* 묵직한 포인트 검정 (Deep Black) */

    /* 경계선 및 효과 */
    --border-light: #DEE2E6;
    /* 중간 톤 그레이 라인 테두리 */
    --border-glow: rgba(18, 18, 18, 0.03);
    --glass-blur: blur(12px);
    --shadow-main: 0 6px 20px 0 rgba(0, 0, 0, 0.03);
    /* 아주 얇고 부드러운 고급형 그림자 */
    --transition-smooth: all 0.2s ease-in-out;
}

/* 🖤 다크 모드 강제 전환 감지 (사용자 OS 테마가 다크모드일 때 자동으로 디자인 토큰을 덮어씁니다) */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-darker: hsl(0, 0%, 7%);
        /* 칠흑색 바탕 */
        --bg-dark: hsl(0, 0%, 11%);
        --bg-panel: rgba(20, 20, 20, 0.45);
        /* 반투명 블랙 글래스 */
        --bg-panel-hover: rgba(35, 35, 35, 0.65);
        --bg-dropdown: rgba(15, 15, 15, 0.95);

        /* 다크용 포인트 컬러 (화이트/연회색 모노톤) */
        --color-primary: hsl(0, 0%, 90%);
        /* 고급스러운 매트 화이트 */
        --color-primary-glow: rgba(255, 255, 255, 0.12);
        --color-emerald: hsl(0, 0%, 75%);
        /* 밝은 실버 그레이 */
        --color-emerald-glow: rgba(255, 255, 255, 0.08);
        --color-warning: hsl(0, 0%, 60%);
        --color-danger: hsl(0, 0%, 80%);

        /* 다크용 텍스트 색상 */
        --text-main: hsl(0, 0%, 95%);
        /* 백색에 가까운 밝은 회색 */
        --text-muted: hsl(0, 0%, 65%);
        /* 연한 차콜 그레이 */

        /* 다크용 경계선 및 효과 */
        --border-light: rgba(255, 255, 255, 0.08);
        --border-glow: rgba(255, 255, 255, 0.05);
        --shadow-main: 0 8px 32px 0 rgba(0, 0, 0, 0.6);
    }
}

/* 3. 기본 리셋 및 전역 레이아웃 */
html {
    scrollbar-gutter: stable; /* 스크롤바 생성에 따른 탭 메뉴 밀림(덜컹거림) 전격 차단 */
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: var(--font-primary);
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-darker);
    background-image:
        radial-gradient(at 0% 0%, rgba(0, 0, 0, 0.015) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(0, 0, 0, 0.01) 0px, transparent 50%);
    background-attachment: fixed;
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    transition: background-color 0.4s ease, color 0.3s ease;
}

/* 다크모드 시 백그라운드 미세 전환 */
@media (prefers-color-scheme: dark) {
    body {
        background-image:
            radial-gradient(at 0% 0%, rgba(255, 255, 255, 0.01) 0px, transparent 50%),
            radial-gradient(at 100% 100%, rgba(255, 255, 255, 0.005) 0px, transparent 50%);
    }
}


/* 스크롤바 커스터마이징 */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-darker);
}

::-webkit-scrollbar-thumb {
    background: rgba(100, 116, 139, 0.2);
    border-radius: 0;
}

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

/* 4. 메인 컨테이너 구조 (Widescreen) */
.app-container {
    display: flex;
    flex-direction: column;
    width: 100%;
    min-height: 100vh;
}

/* 5. 프리미엄 상단 헤더 네비게이션 바 (Top Widescreen Header) */
.top-header {
    background: var(--bg-dropdown);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-main);
    transition: background-color 0.5s ease, border-color 0.3s ease;
}

/* 1층 로그인 탑바 스타일 */
.header-top-bar {
    background: transparent;
    /* 탭 헤더 쪽 배경과 완전히 통일 */
    border-bottom: none;
    /* 사이 나누는 줄 제거 */
    height: 36px;
    display: flex;
    align-items: center;
}

.top-bar-container {
    max-width: 1440px;
    width: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    /* 우측 정렬 */
    gap: 16px;
    font-size: 0.72rem;
    /* 0.8rem에서 0.72rem으로 더욱 정밀하게 축소 */
    color: var(--text-muted);
}

.top-bar-container .user-info {
    display: flex;
    align-items: center;
    gap: 6px;
}

.top-bar-container .dept {
    color: var(--text-muted);
    font-weight: 500;
    background: rgba(255, 255, 255, 0.05);
    padding: 2px 8px;
    border-radius: 0;
}

.top-bar-container .name {
    color: var(--text-main);
    font-weight: 700;
}

.top-bar-container .pos {
    color: var(--text-muted);
    font-weight: 500;
}

.top-bar-logout {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-smooth);
    margin-left: 8px;
    position: relative;
    padding-left: 14px;
}

.top-bar-logout::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 10px;
    background: var(--border-light);
}

.top-bar-logout:hover {
    color: var(--text-main);
    text-decoration: underline;
}

.header-container {
    max-width: 1440px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    /* 로고 좌측, 탭 메뉴 우측 */
    padding: 0 24px;
    height: 70px;
    /* 로고가 들어가는 2단 높이 조금 키움 */
}

/* 로고 섹션 */
.brand-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.brand-logo span {
    font-size: 1.8rem;
    /* 로고 글자 크기 조금 더 상향 */
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-main) 0%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: 1.5px;
}

/* 6. 메인 가로형 탭 드롭다운 메뉴 (Navigation Menu) */
.nav-menu {
    display: flex;
    list-style: none;
    height: 100%;
    gap: 8px;
    margin-right: 25px;
    /* 우측 끝에서 적정 거리 떨어지도록 설정 */
}

.nav-item {
    position: relative;
    display: flex;
    align-items: center;
    height: 70px;
    /* 헤더 높이 70px에 맞춤 */
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 6px 12px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    /* 글자 크기 조금 더 확대 (0.95rem) */
    font-weight: 700;
    /* 시크하고 또렷하게 */
    border-radius: 0;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
    white-space: nowrap;
    letter-spacing: -0.3px;
}

.nav-item:hover .nav-link {
    color: var(--text-main);
    background: transparent;
    border-color: transparent;
}

/* 활성화 탭 표시 - 글자색 메인 톤으로 강조하고 하단에 세련된 포인트 언더라인 */
.nav-item.active .nav-link {
    color: var(--text-main) !important;
    background: transparent !important;
    box-shadow: none !important;
    border: none !important;
    border-bottom: 3px solid var(--color-primary) !important;
    border-radius: 0 !important;
    font-weight: 800 !important;
}

/* 7. 프리미엄 글래스모피즘 드롭다운 판넬 (Dropdown Panel) */
.dropdown-panel {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    width: 160px;
    background: var(--bg-dropdown);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-light);
    border-radius: 0;
    padding: 8px;
    box-shadow: var(--shadow-main);
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
    z-index: 1010;
}

/* 호버 시 부드러운 드롭다운 애니메이션 */
.nav-item:hover .dropdown-panel {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.dropdown-link {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.82rem;
    /* 가독성 좋은 아담한 크기 */
    font-weight: 600;
    border-radius: 0;
    transition: var(--transition-smooth);
}

.dropdown-link:hover {
    color: var(--text-main);
    background: var(--bg-panel-hover);
}

/* 8. 메인 콘텐츠 와이드스페이스 영역 */
.main-content {
    flex: 1;
    padding: 40px 24px;
    max-width: 1440px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
}

/* 와이드 상단 정보 네비 바 (Top Mini Panel) */
.content-header-panel {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.page-title-label {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.page-title-label::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 24px;
    background: var(--color-primary);
    border-radius: 0;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-badge {
    background: transparent;
    padding: 0;
    border-radius: 0;
    font-size: 0.85rem;
    font-weight: 600;
    border: none;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 1px;
    color: var(--text-main);
    line-height: 1.25;
}

/* 다크모드 시 배지 불투명도 조율 */
@media (prefers-color-scheme: dark) {
    .user-badge {
        background: rgba(255, 255, 255, 0.04);
    }
}

.user-badge i {
    color: var(--color-emerald);
}

/* 🏷️ 로그아웃 텍스트 링크 (박스 없이 색상 변화 없는 정적 스타일 설정) */
.text-logout {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    font-size: 0.82rem;
    font-weight: 600;
    text-decoration: none;
    transition: none;
    cursor: pointer;
}

.text-logout:hover,
.text-logout:active,
.text-logout:focus,
.text-logout:visited {
    color: var(--text-muted) !important;
    background: transparent !important;
    text-decoration: none !important;
    box-shadow: none !important;
    transform: none !important;
    opacity: 1 !important;
}


/* 9. 프리미엄 글래스 카드 컴포넌트 */
.glass-card {
    background: transparent;
    border: none;
    border-radius: 0;
    padding: 0;
    box-shadow: none;
    margin-bottom: 24px;
    position: relative;
    overflow: visible;

}

.glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -50%;
    width: 200%;
    height: 100%;
    background: linear-gradient(to right,
            rgba(255, 255, 255, 0) 0%,
            rgba(255, 255, 255, 0.04) 50%,
            rgba(255, 255, 255, 0) 100%);
    transform: skewX(-25deg);
    transition: 0.75s;
    pointer-events: none;
}

.glass-card:hover::before {
    left: 125%;
}

.card-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 10px;
}

/* 10. 멋진 버튼들 (Unified Mono Buttons) */
.btn-primary, .btn-success, .btn-danger, .btn-secondary, .btn-warning {
    background: var(--bg-panel);
    color: var(--text-main);
    border: 1px solid var(--border-light);
    height: 32px;
    padding: 0 16px;
    font-size: 0.85rem;
    font-weight: 400; /* 볼드체 삭제 */
    border-radius: 0;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    box-shadow: none;
}

.btn-primary:hover, .btn-success:hover, .btn-danger:hover, .btn-secondary:hover, .btn-warning:hover {
    background: var(--bg-panel-hover);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

@media (prefers-color-scheme: dark) {
    .btn-primary, .btn-success, .btn-danger, .btn-secondary, .btn-warning {
        color: var(--text-main);
    }
}
/* 11. 로그인 폼 전용 스타일 */
.login-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100vw;
    height: 100vh;
    background-color: var(--bg-darker);
    transition: background-color 0.5s ease;
}

.login-card {
    width: 420px;
    padding: 40px;
    background: var(--bg-panel);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
    border-radius: 0;
    box-shadow: var(--shadow-main);
    text-align: center;
    transition: background-color 0.5s ease, border-color 0.3s ease;
}

.login-logo {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-main) 0%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 8px;
}

.login-subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 32px;
}

.input-group {
    margin-bottom: 20px;
    text-align: left;
}

.input-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-field {
    width: 100%;
    padding: 14px 16px;
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid var(--border-light);
    border-radius: 0;
    color: var(--text-main);
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition-smooth);
}

/* 다크모드 시 인풋 백그라운드 색 조율 */
@media (prefers-color-scheme: dark) {
    .input-field {
        background: rgba(255, 255, 255, 0.03);
    }
}

.input-field:focus {
    border-color: var(--color-primary);
    background: rgba(0, 0, 0, 0.04);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

@media (prefers-color-scheme: dark) {
    .input-field:focus {
        background: rgba(255, 255, 255, 0.06);
    }
}

.messages-container {
    margin-bottom: 20px;
}

.alert-message {
    padding: 12px 16px;
    border-radius: 0;
    font-size: 0.85rem;
    font-weight: 500;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-message.error {
    background: rgba(244, 63, 94, 0.08);
    border: 1px solid rgba(244, 63, 94, 0.2);
    color: var(--color-danger);
}

@media (prefers-color-scheme: dark) {
    .alert-message.error {
        background: rgba(244, 63, 94, 0.15);
        border: 1px solid rgba(244, 63, 94, 0.3);
        color: #fda4af;
    }
}



/* =====================================================================
   📊 13. 프리미엄 글래스모피즘 테이블 & 리스트 (Glass Table & Lists)
   ===================================================================== */
.glass-table-container {
    width: 100%;
    overflow-x: auto;
    background: var(--bg-panel);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-light);
    border-radius: 0;
    box-shadow: var(--shadow-main);
    margin-bottom: 24px;
}

.glass-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.92rem;
    color: var(--text-main);
}

.glass-table th {
    background: rgba(0, 0, 0, 0.03);
    padding: 16px 20px;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border-light);
}

@media (prefers-color-scheme: dark) {
    .glass-table th {
        background: rgba(255, 255, 255, 0.02);
    }
}

.glass-table td {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition-smooth);
    vertical-align: middle;
}

.glass-table tbody tr:last-child td {
    border-bottom: none;
}

.glass-table tbody tr {
    transition: var(--transition-smooth);
}

.glass-table tbody tr:hover {
    background: var(--bg-panel-hover);
}

/* =====================================================================
   🏷️ 14. 콤팩트 상태 배지 (Status Badges)
   ===================================================================== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 0;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
}

.badge-active {
    background: var(--color-emerald-glow);
    color: var(--color-emerald);
    border: 1px solid hsla(150, 75%, 40%, 0.2);
}

.badge-retired {
    background: rgba(244, 63, 94, 0.08);
    color: var(--color-danger);
    border: 1px solid rgba(244, 63, 94, 0.2);
}

.badge-hold,
.badge-onleave {
    background: rgba(245, 158, 11, 0.08);
    color: var(--color-warning);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

/* =====================================================================
   🔍 15. 가로형 검색 필터 바 (Horizontal Filter Search Bar)
   ===================================================================== */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: 16px;
    background: var(--bg-panel);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-light);
    border-radius: 0;
    padding: 20px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-main);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 1;
    min-width: 150px;
}

.filter-label {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

.filter-input {
    width: 100%;
    padding: 10px 14px;
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid var(--border-light);
    border-radius: 0;
    color: var(--text-main);
    font-size: 0.88rem;
    outline: none;
    transition: var(--transition-smooth);
}

@media (prefers-color-scheme: dark) {
    .filter-input {
        background: rgba(255, 255, 255, 0.03);
    }
}

.filter-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.filter-actions {
    display: flex;
    gap: 8px;
}

.btn-filter-search {
    background: var(--color-emerald);
    color: #fff;
    border: none;
    padding: 11px 20px;
    font-size: 0.88rem;
    font-weight: 600;
    border-radius: 0;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    box-shadow: 0 2px 8px var(--color-emerald-glow);
}

@media (prefers-color-scheme: dark) {
    .btn-filter-search {
        color: #111;
    }
}

.btn-filter-search:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--color-emerald-glow);
}

.btn-filter-reset {
    background: transparent;
    border: 1px solid var(--border-light);
    color: var(--text-muted);
    padding: 11px 20px;
    font-size: 0.88rem;
    font-weight: 600;
    border-radius: 0;
    cursor: pointer;
    transition: var(--transition-smooth);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-filter-reset:hover {
    background: var(--bg-panel-hover);
    color: var(--text-main);
}

/* =====================================================================
   🛠️ 16. 정밀 액션 아이콘 버튼 (Mini Icon Action Buttons)
   ===================================================================== */
.btn-icon {
    min-width: 32px;
    width: auto;
    height: 32px;
    padding: 0 10px;
    border-radius: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid transparent;
    background: transparent;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 700;
    transition: var(--transition-smooth);
}

.btn-icon-edit {
    color: var(--color-primary);
}

.btn-icon-edit:hover {
    background: var(--color-primary-glow);
    border-color: rgba(99, 102, 241, 0.2);
}

.btn-icon-delete {
    color: var(--color-danger);
}

.btn-icon-delete:hover {
    background: rgba(244, 63, 94, 0.08);
    border-color: rgba(244, 63, 94, 0.2);
}

/* =====================================================================
   🌫️ 17. 프리미엄 글래스모피즘 모달 (Frosted Glass Modal Overlay)
   ===================================================================== */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(10, 11, 13, 0.4);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-backdrop.show {
    opacity: 1;
    visibility: visible;
}

.glass-modal {
    background: var(--bg-dropdown);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-light);
    border-radius: 0;
    width: 100%;
    max-width: 600px;
    box-shadow: var(--shadow-main);
    transform: scale(0.9) translateY(-20px);
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal-backdrop.show .glass-modal {
    transform: scale(1) translateY(0);
}

.modal-header {
    padding: 20px 28px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-modal-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-modal-close:hover {
    background: var(--bg-panel-hover);
    color: var(--text-main);
}

.modal-body {
    padding: 24px 28px;
    overflow-y: auto;
    max-height: 70vh;
}

.modal-footer {
    padding: 16px 28px;
    border-top: 1px solid var(--border-light);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    background: rgba(0, 0, 0, 0.01);
}

@media (prefers-color-scheme: dark) {
    .modal-footer {
        background: rgba(255, 255, 255, 0.01);
    }
}

/* =====================================================================
   🏢 18. 그리드 폼 & 체크박스 (Grid Form & Checkbox Settings)
   ===================================================================== */
.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.form-grid-full {
    grid-column: span 2;
}

/* 체크박스 그리드 및 예쁜 카드 디자인 */
.checkbox-grid-title {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-muted);
    margin-bottom: 10px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    background: rgba(0, 0, 0, 0.015);
    border: 1px solid var(--border-light);
    border-radius: 0;
    padding: 14px;
}

@media (prefers-color-scheme: dark) {
    .checkbox-grid {
        background: rgba(255, 255, 255, 0.015);
    }
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
    cursor: pointer;
    padding: 6px 8px;
    border-radius: 0;
    transition: var(--transition-smooth);
}

.checkbox-item:hover {
    background: var(--bg-panel-hover);
}

.checkbox-item input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border: 1px solid var(--border-light);
    border-radius: 0;
    outline: none;
    background: rgba(0, 0, 0, 0.02);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
}

@media (prefers-color-scheme: dark) {
    .checkbox-item input[type="checkbox"] {
        background: rgba(255, 255, 255, 0.04);
    }
}

.checkbox-item input[type="checkbox"]::before {
    content: "\f00c";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    font-size: 0.65rem;
    color: #fff;
    display: none;
}

.checkbox-item input[type="checkbox"]:checked {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.checkbox-item input[type="checkbox"]:checked::before {
    display: block;
}

/* =====================================================================
   🔔 19. 다이내믹 토스트 알림 (Premium Web Toasts)
   ===================================================================== */
.toast-container {
    position: fixed;
    bottom: 30px;
    right: 30px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 3000;
}

.toast {
    background: var(--bg-dropdown);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-light);
    border-radius: 0;
    padding: 16px 20px;
    min-width: 300px;
    box-shadow: var(--shadow-main);
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-main);
    font-weight: 600;
    font-size: 0.88rem;
    transform: translateY(20px);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast-icon {
    font-size: 1.1rem;
}

.toast-success .toast-icon {
    color: var(--color-emerald);
}

.toast-error .toast-icon {
    color: var(--color-danger);
}

/* =====================================================================
   📄 20. 프리미엄 글래스모피즘 페이지네이션 (Glassmorphic Pagination)
   ===================================================================== */
.glass-pagination-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 0;
    margin-top: 20px;
    background: transparent;
    border: none;
    box-shadow: none;
    flex-wrap: wrap;
    gap: 16px;
}

.pagination-info {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-muted);
}

.pagination-info strong {
    color: var(--text-main);
    font-weight: 700;
}

.pagination-controls {
    display: flex;
    align-items: center;
    gap: 6px;
}

.pagination-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 34px;
    height: 34px;
    padding: 0 8px;
    border-radius: 0;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-muted);
    border: 1px solid var(--border-light);
    background: transparent;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition-smooth);
}

.pagination-link:hover {
    color: var(--text-main);
    background: var(--bg-panel-hover);
    border-color: var(--text-muted);
    transform: translateY(-1px);
}

.pagination-link.active {
    background: var(--color-primary) !important;
    color: #fff !important;
    border-color: var(--color-primary) !important;
    box-shadow: 0 4px 12px var(--color-primary-glow);
}

@media (prefers-color-scheme: dark) {
    .pagination-link.active {
        color: #fff !important;
    }
}

.pagination-link.disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

/* =====================================================================
   📱 21. 모바일 반응형 헤더 & 아코디언 트리 메뉴 (Mobile Navigation)
   ===================================================================== */

/* 1. 기본 PC 화면에서 햄버거 토글 버튼 숨김 */
.mobile-nav-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-main);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
    border-radius: 0;
}

.mobile-nav-toggle:hover {
    background: var(--bg-panel-hover);
}