/* ==========================================================================
   학원관리솔루션 - 최적화된 커스텀 스타일 (Bootstrap 5 + 필수 커스텀만)
   ========================================================================== */

/* CSS 변수 정의 */
:root {
    /* 브랜드 컬러 */
    --primary-color: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #6366f1;

    /* 레이아웃 */
    --header-height: 64px;
    --sidebar-width: 260px;
    --sidebar-icon-width: 72px;

    /* 색상 시스템 */
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;

    /* 텍스트 */
    --text-primary: #1f2937;
    --text-secondary: #6b7280;

    /* 배경 */
    --bg-body: #f9fafb;
    --bg-card: #ffffff;
    --bg-hover: #f3f4f6;

    /* 테두리 */
    --border-color: #e5e7eb;
}

/* 전역 스타일 */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", Roboto, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-body);
    font-size: 14px;
}

/* 스크롤바 */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: #f1f1f1; }
::-webkit-scrollbar-thumb { background: #c1c1c1; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #a8a8a8; }

/* ==========================================================================
   레이아웃 핵심 구조
   ========================================================================== */

/* 헤더 */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.sidebar-toggle {
    margin-left: -10px;
    transition: all 0.2s;
}

.sidebar-toggle:hover {
    background: var(--bg-hover);
}

.header-logo {
    color: var(--text-primary);
    font-size: 1.25rem;
}

.header-logo i {
    color: var(--primary-color);
}

/* 알림 & 사용자 메뉴 버튼 */
.notification-bell,
.sidebar-toggle {
    background: none;
    border: none;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s;
}

.notification-badge {
    position: absolute;
    top: 0.25rem;
    right: 0.25rem;
    background: var(--danger-color);
    font-size: 0.625rem;
    min-width: 18px;
}

.user-menu {
    cursor: pointer;
    transition: all 0.2s;
}

.user-menu:hover {
    background: var(--bg-hover);
}

.user-avatar {
    width: 36px;
    height: 36px;
    background: var(--primary-light);
}

/* 사이드바 */
.app-sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--bg-card);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    transition: transform 0.3s;
    z-index: 999;
}

/* 데스크톱: 기본 숨김, show 시 표시 */
@media (min-width: 1025px) {
    .app-sidebar {
        transform: translateX(-100%);
    }
    .app-sidebar.show {
        transform: translateX(0);
    }
}

/* 1depth 단일 메뉴 */
.nav-link.single {
    color: var(--text-secondary);
    transition: all 0.2s;
    border-bottom: 1px solid var(--border-color);
}

.nav-link.single:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.nav-link.single.active {
    background: var(--primary-light);
    color: white;
    position: relative;
}

.nav-link.single.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--primary-dark);
}

/* 아코디언 메뉴 */
.menu-section {
    border-bottom: 1px solid var(--border-color);
}

.menu-section-header {
    width: 100%;
    background: none;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
    position: relative;
}

.menu-section-header::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 1px;
    background: var(--border-color);
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.menu-section-header.open::after {
    transform: scaleY(1);
}

.menu-section-header:hover {
    background: var(--bg-hover);
}

.section-icon {
    transition: transform 0.3s;
}

.menu-section-header.open .section-icon {
    transform: rotate(180deg);
}

.menu-section-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.menu-section-content.show {
    max-height: 500px;
    transition: max-height 0.3s ease-in;
}

/* 2depth 하위 메뉴 */
.menu-section-content .nav-link {
    color: var(--text-secondary);
    transition: all 0.2s;
    position: relative;
}

.menu-section-content .nav-link:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.menu-section-content .nav-link.active {
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary-color);
}

.menu-section-content .nav-link.active::before {
    content: '';
    position: absolute;
    left: 2rem;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary-color);
}

/* 메인 컨텐츠 */
.app-main {
    margin-top: var(--header-height);
    margin-left: 0;
    width: 100%;
    min-height: calc(100vh - var(--header-height));
    transition: all 0.3s;
}

@media (min-width: 769px) {
    .app-main.sidebar-open {
        margin-left: var(--sidebar-width);
        width: calc(100% - var(--sidebar-width));
    }
}

/* ==========================================================================
   대시보드 컴포넌트
   ========================================================================== */

/* 통계 카드 */
.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    transition: all 0.2s;
}

.stat-card:hover {
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.stat-icon {
    width: 48px;
    height: 48px;
}

.stat-icon.primary {
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary-color);
}

.stat-icon.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.stat-icon.warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.stat-icon.danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

/* 빠른 메뉴 */
.quick-menu {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
}

.quick-menu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
}

.quick-menu-item {
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: all 0.2s;
}

.quick-menu-item:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* 차트 컨테이너 */
.chart-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
}

/* 세로 막대 차트 */
.chart-bars {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    height: 200px;
    gap: 0.5rem;
}

.chart-bar {
    flex: 1;
}

.bar-fill {
    width: 100%;
    background: linear-gradient(180deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border-radius: 6px 6px 0 0;
    transition: all 0.3s;
}

.bar-fill:hover {
    opacity: 0.8;
    transform: translateY(-2px);
}

/* 가로 막대 차트 */
.chart-bars.horizontal {
    flex-direction: column;
    height: auto;
    align-items: stretch;
}

.bar-track {
    flex: 1;
    background: var(--bg-hover);
    border-radius: 6px;
    height: 32px;
    overflow: hidden;
}

.bar-fill-h {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border-radius: 6px;
    transition: all 0.3s;
}

.bar-fill-h:hover {
    opacity: 0.9;
}

/* 간단한 통계 */
.simple-stat-item {
    background: var(--bg-hover);
}

/* 알림 드롭다운 */
.notification-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    width: 360px;
    max-height: 480px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    display: none;
    z-index: 1001;
}

.notification-dropdown.show {
    display: block;
}

.notification-item {
    cursor: pointer;
    transition: all 0.2s;
}

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

.notification-item.unread {
    background: rgba(79, 70, 229, 0.05);
}

/* ==========================================================================
   반응형 - 태블릿 & 모바일 최적화
   ========================================================================== */

/* 사이드바 아이콘 모드 (태블릿용) */
.app-sidebar.icon-mode {
    width: var(--sidebar-icon-width);
    overflow-y: auto;
    transform: translateX(0) !important;
    transition: none !important;
}

.app-sidebar.icon-mode .menu-section-header {
    justify-content: center;
    padding: 1rem;
}

.app-sidebar.icon-mode .nav-link.single {
    justify-content: center;
    padding: 1rem;
}

/* 플라이아웃 메뉴 */
.menu-section {
    position: relative;
}

.menu-flyout {
    position: fixed;
    left: calc(var(--sidebar-icon-width) + 0.5rem);
    min-width: 240px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    z-index: 1001;
    animation: flyoutFadeIn 0.2s ease-out;
    transition: none !important;
}

@keyframes flyoutFadeIn {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.flyout-header {
    background: var(--bg-hover);
    border-radius: 8px 8px 0 0;
}

.menu-flyout .nav-link {
    color: var(--text-secondary);
    transition: all 0.2s;
    font-size: 0.875rem;
}

.menu-flyout .nav-link:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.menu-flyout .nav-link.active {
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary-color);
}

.menu-flyout .nav-link:last-child {
    border-radius: 0 0 8px 8px;
}

/* 태블릿 (769px ~ 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
    /* 태블릿에서는 사이드바 항상 표시 (애니메이션 없이) */
    .app-sidebar {
        transform: translateX(0) !important;
        transition: none !important;
    }

    /* 태블릿에서 메인 영역 애니메이션 제거 */
    .app-main {
        transition: none !important;
    }

    /* 아이콘 모드일 때 메인 컨텐츠 조정 */
    .app-main.sidebar-open {
        margin-left: var(--sidebar-icon-width);
        width: calc(100% - var(--sidebar-icon-width));
    }

    .app-sidebar.icon-mode + .app-main {
        margin-left: var(--sidebar-icon-width);
        width: calc(100% - var(--sidebar-icon-width));
    }

    /* 검색창 크기 조정 */
    .header-search {
        max-width: 400px !important;
    }

    /* 터치 영역 확대 */
    .btn {
        min-height: 44px;
        padding: 0.625rem 1rem;
    }

    .btn-sm {
        min-height: 38px;
        padding: 0.5rem 0.875rem;
    }

    .form-control,
    .form-select {
        min-height: 44px;
        font-size: 16px; /* iOS zoom 방지 */
    }

    .sidebar-toggle,
    .notification-bell {
        min-width: 44px;
        min-height: 44px;
    }
}

/* 모바일 검색창 */
.mobile-search-bar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    z-index: 998;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 모바일 (≤768px) */
@media (max-width: 768px) {
    .app-sidebar {
        transform: translateX(-100%);
    }

    .app-sidebar.show {
        transform: translateX(0);
    }

    /* 모바일 터치 영역 */
    .btn {
        min-height: 44px;
        padding: 0.625rem 1rem;
    }

    .form-control,
    .form-select {
        min-height: 44px;
        font-size: 16px; /* iOS zoom 방지 */
    }

    /* 테이블 가로 스크롤 */
    .table-responsive {
        -webkit-overflow-scrolling: touch;
    }

    /* 모달 크기 조정 */
    .modal-dialog {
        margin: 0.5rem;
        max-width: calc(100% - 1rem);
    }
}

/* ==========================================================================
   시간표 스타일
   ========================================================================== */

.schedule-item {
    transition: all 0.2s;
    cursor: pointer;
    border: 1px solid transparent;
}

.schedule-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.schedule-math {
    background-color: #e7f1ff;
    border-color: #d0e4ff;
}

.schedule-math:hover {
    background-color: #d0e4ff;
}

.schedule-english {
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.schedule-english:hover {
    background-color: #c3e6cb;
}

.schedule-science {
    background-color: #d1ecf1;
    border-color: #bee5eb;
}

.schedule-science:hover {
    background-color: #bee5eb;
}

.schedule-korean {
    background-color: #fff3cd;
    border-color: #ffeaa7;
}

.schedule-korean:hover {
    background-color: #ffeaa7;
}

.schedule-default {
    background-color: #e9ecef;
    border-color: #dee2e6;
}

.schedule-default:hover {
    background-color: #dee2e6;
}

/* ==========================================================================
   로그인 페이지
   ========================================================================== */

.login-page {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 2rem 1rem;
}

.login-container {
    width: 100%;
    max-width: 480px;
    margin: 0 auto;
}

.login-logo {
    animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

.login-page .card {
    animation: cardSlideUp 0.5s ease-out;
}

@keyframes cardSlideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-page .input-group-text {
    border: 1px solid #dee2e6;
}

.login-page .form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(79, 70, 229, 0.25);
}

.login-page .cursor-pointer {
    cursor: pointer;
}

.login-page .btn-primary {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transition: all 0.3s;
}

.login-page .btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(79, 70, 229, 0.3);
}

.login-page .btn-primary:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

@media (max-width: 576px) {
    .login-page .card {
        width: 100%;
        margin: 0 1rem;
    }

    .login-page .card-body {
        padding: 2rem !important;
    }
}