:root {
    --primary: #0078d4;
    --primary-dark: #106ebe;
    --primary-light: #deecf9;
    --sidebar-width: 260px;
    --navbar-height: 56px;
    --bg-main: #f5f5f5;
    --bg-white: #ffffff;
    --text-primary: #323130;
    --text-secondary: #605e5c;
    --border-color: #edebe9;
    --hover-bg: #f3f2f1;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 3px 12px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.14);
    --radius: 8px;
    --transition: all 0.2s ease;
}

* { box-sizing: border-box; }

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
}

/* ===== NAVBAR ===== */
.bg-primary-custom {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%) !important;
    box-shadow: var(--shadow-sm);
}

.navbar { height: var(--navbar-height); z-index: 1050; }
.navbar-brand { font-size: 1.2rem; letter-spacing: -0.5px; }

.search-bar-container {
    max-width: 600px;
    position: relative;
}

.search-bar-container .input-group {
    background: rgba(255,255,255,0.15);
    border-radius: 6px;
    transition: var(--transition);
}

.search-bar-container .input-group:focus-within {
    background: #fff;
    box-shadow: var(--shadow-md);
}

.search-bar-container .input-group:focus-within .input-group-text,
.search-bar-container .input-group:focus-within .form-control { background: #fff; }

.search-bar-container .input-group-text {
    background: transparent;
    border: none;
    color: rgba(255,255,255,0.7);
    padding-left: 12px;
}

.search-bar-container .input-group:focus-within .input-group-text { color: var(--text-secondary); }

.search-bar-container .form-control {
    background: transparent;
    border: none;
    color: #fff;
    padding: 8px 12px;
}

.search-bar-container .form-control::placeholder { color: rgba(255,255,255,0.7); }
.search-bar-container .input-group:focus-within .form-control { color: var(--text-primary); }
.search-bar-container .input-group:focus-within .form-control::placeholder { color: var(--text-secondary); }

.search-results-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    border-radius: 0 0 var(--radius) var(--radius);
    box-shadow: var(--shadow-lg);
    max-height: 400px;
    overflow-y: auto;
    display: none;
    z-index: 1060;
}

.search-results-dropdown.show { display: block; }

.search-result-item {
    padding: 10px 16px;
    display: flex;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    color: var(--text-primary);
}

.search-result-item:hover { background: var(--hover-bg); }
.search-result-item .file-icon { margin-right: 12px; font-size: 1.2rem; }
.search-result-item .file-info .file-name { font-weight: 500; font-size: 0.9rem; }
.search-result-item .file-info .file-meta { font-size: 0.75rem; color: var(--text-secondary); }

.avatar-circle {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255,255,255,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.85rem;
}

/* ===== SIDEBAR ===== */
.main-wrapper {
    display: flex;
    padding-top: var(--navbar-height);
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-white);
    border-right: 1px solid var(--border-color);
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    bottom: 0;
    overflow-y: auto;
    z-index: 1040;
    transition: transform 0.3s ease;
}

.sidebar-content { padding: 20px 12px; }

.sidebar-link {
    display: flex;
    align-items: center;
    padding: 8px 16px;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 6px;
    margin-bottom: 2px;
    transition: var(--transition);
    font-size: 0.9rem;
    border-left: 3px solid transparent;
}

.sidebar-link:hover { background: var(--hover-bg); color: var(--text-primary); }
.sidebar-link.active { background: var(--primary-light); color: var(--primary); font-weight: 500; border-left-color: var(--primary); }
.sidebar-link i { width: 20px; margin-right: 12px; text-align: center; }

.sidebar-heading {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 8px 16px 4px;
    margin: 0;
}

.sidebar-divider { height: 1px; background: var(--border-color); margin: 12px 0; }

.btn-upload-main {
    border-radius: var(--radius);
    padding: 10px;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.btn-upload-main:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }

.storage-info .progress {
    border-radius: 4px;
    background: var(--border-color);
}

/* ===== MAIN CONTENT ===== */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 24px 32px;
    min-width: 0;
}

/* ===== BREADCRUMB ===== */
.breadcrumb-nav {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.breadcrumb-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 4px 8px;
    border-radius: 4px;
    transition: var(--transition);
}

.breadcrumb-nav a:hover { background: var(--hover-bg); color: var(--primary); }
.breadcrumb-nav .separator { color: var(--text-secondary); margin: 0 2px; }
.breadcrumb-nav .current { font-weight: 600; color: var(--text-primary); padding: 4px 8px; }

/* ===== TOOLBAR ===== */
.content-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 8px;
}

.content-toolbar .btn-group .btn {
    border-color: var(--border-color);
    color: var(--text-secondary);
    background: var(--bg-white);
    padding: 6px 12px;
    font-size: 0.85rem;
}

.content-toolbar .btn-group .btn.active,
.content-toolbar .btn-group .btn:hover {
    background: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
}

/* ===== FILE GRID ===== */
.files-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
}

.file-card {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 16px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.file-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.file-card .file-icon-large {
    font-size: 3rem;
    margin-bottom: 12px;
    display: block;
}

.file-card .file-name {
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 4px;
}

.file-card .file-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.file-card .file-actions {
    position: absolute;
    top: 8px;
    right: 8px;
    opacity: 0;
    transition: var(--transition);
}

.file-card:hover .file-actions { opacity: 1; }

.file-card .file-checkbox {
    position: absolute;
    top: 8px;
    left: 8px;
    opacity: 0;
    transition: var(--transition);
}

.file-card:hover .file-checkbox { opacity: 1; }

/* ===== FILE LIST ===== */
.files-list { background: var(--bg-white); border-radius: var(--radius); border: 1px solid var(--border-color); }

.files-list-header {
    display: grid;
    grid-template-columns: 40px 1fr 150px 120px 100px 60px;
    padding: 10px 16px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.file-list-item {
    display: grid;
    grid-template-columns: 40px 1fr 150px 120px 100px 60px;
    padding: 10px 16px;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
    cursor: pointer;
    text-decoration: none;
    color: var(--text-primary);
}

.file-list-item:last-child { border-bottom: none; }
.file-list-item:hover { background: var(--hover-bg); }

.file-list-item .file-icon { font-size: 1.3rem; text-align: center; }
.file-list-item .file-name { font-weight: 500; font-size: 0.9rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-list-item .file-meta { font-size: 0.8rem; color: var(--text-secondary); }

.file-list-item .file-actions-list {
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: var(--transition);
}

.file-list-item:hover .file-actions-list { opacity: 1; }

.file-list-item .file-actions-list .btn {
    padding: 4px 8px;
    font-size: 0.8rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: 4px;
}

.file-list-item .file-actions-list .btn:hover { background: var(--border-color); color: var(--primary); }

/* ===== FOLDER CARD ===== */
.folder-card .file-icon-large { color: #f0c040; }

/* ===== DASHBOARD ===== */
.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    align-items: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.stat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

.stat-card .stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    margin-right: 16px;
}

.stat-card .stat-value { font-size: 1.5rem; font-weight: 700; line-height: 1.2; }
.stat-card .stat-label { font-size: 0.8rem; color: var(--text-secondary); }

.dept-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
}

.dept-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 20px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    text-decoration: none;
    color: var(--text-primary);
    display: block;
}

.dept-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    color: var(--text-primary);
}

.dept-card .dept-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: #fff;
    margin-bottom: 12px;
}

.dept-card h5 { font-weight: 600; font-size: 1rem; margin-bottom: 4px; }
.dept-card .dept-meta { font-size: 0.8rem; color: var(--text-secondary); }

/* ===== UPLOAD ZONE ===== */
.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius);
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

.upload-zone:hover, .upload-zone.drag-over {
    border-color: var(--primary);
    background: var(--primary-light);
}

.upload-file-item {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    background: var(--hover-bg);
    border-radius: 6px;
    margin-bottom: 4px;
}

.upload-file-item .file-icon { margin-right: 10px; }
.upload-file-item .file-name { flex: 1; font-size: 0.85rem; }
.upload-file-item .file-size { font-size: 0.75rem; color: var(--text-secondary); margin-right: 8px; }

/* ===== LOGIN PAGE ===== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px;
}

.login-card {
    background: var(--bg-white);
    border-radius: 16px;
    padding: 48px;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-lg);
}

.login-card .logo {
    text-align: center;
    margin-bottom: 32px;
}

.login-card .logo i { font-size: 3rem; color: var(--primary); margin-bottom: 8px; display: block; }
.login-card .logo h2 { font-weight: 700; color: var(--text-primary); margin: 0; font-size: 1.5rem; }
.login-card .logo p { color: var(--text-secondary); font-size: 0.9rem; margin: 0; }

.login-card .form-control {
    padding: 12px 16px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    font-size: 0.95rem;
}

.login-card .form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(0,120,212,0.15); }

.login-card .btn-primary {
    padding: 12px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 1rem;
}

/* ===== ADMIN ===== */
.admin-table { background: var(--bg-white); border-radius: var(--radius); overflow: hidden; }

.admin-table .table { margin: 0; }
.admin-table .table th { background: var(--hover-bg); font-weight: 600; font-size: 0.85rem; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.5px; }

/* ===== EDITOR ===== */
.editor-container {
    background: var(--bg-white);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    min-height: 70vh;
    position: relative;
}

.editor-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-color);
    background: var(--hover-bg);
    border-radius: var(--radius) var(--radius) 0 0;
}

.editor-toolbar .file-title {
    font-weight: 600;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.editor-toolbar .save-status {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
}

.editor-toolbar .save-status.saved { color: #2ecc71; }
.editor-toolbar .save-status.saving { color: #f39c12; }

.editor-body { padding: 0; min-height: 60vh; }

.editor-body iframe {
    width: 100%;
    min-height: 70vh;
    border: none;
}

/* ===== CONTEXT MENU ===== */
.context-menu {
    position: fixed;
    background: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    z-index: 9999;
    min-width: 200px;
    padding: 8px 0;
    display: none;
}

.context-menu.show { display: block; }

.context-menu-item {
    display: flex;
    align-items: center;
    padding: 8px 16px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: var(--transition);
}

.context-menu-item:hover { background: var(--hover-bg); }
.context-menu-item i { width: 20px; margin-right: 10px; color: var(--text-secondary); }
.context-menu-item.danger { color: #e74c3c; }
.context-menu-item.danger i { color: #e74c3c; }
.context-menu-divider { height: 1px; background: var(--border-color); margin: 4px 0; }

/* ===== EMPTY STATE ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state i { font-size: 4rem; color: var(--border-color); margin-bottom: 16px; display: block; }
.empty-state h5 { color: var(--text-primary); margin-bottom: 8px; }

/* ===== ACTIVITY LOG ===== */
.activity-item {
    display: flex;
    align-items: flex-start;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.activity-item:last-child { border-bottom: none; }

.activity-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 12px;
    flex-shrink: 0;
    font-size: 0.85rem;
}

.activity-content { flex: 1; }
.activity-content .activity-text { font-size: 0.9rem; }
.activity-content .activity-time { font-size: 0.75rem; color: var(--text-secondary); }

/* ===== RESPONSIVE ===== */
@media (max-width: 992px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.show { transform: translateX(0); }
    .main-content { margin-left: 0; padding: 16px; }
    .files-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }

    .file-list-item {
        grid-template-columns: 40px 1fr 60px;
    }

    .file-list-item .file-modified,
    .file-list-item .file-owner,
    .file-list-item .file-size-col { display: none; }

    .files-list-header {
        grid-template-columns: 40px 1fr 60px;
    }

    .files-list-header .col-modified,
    .files-list-header .col-owner,
    .files-list-header .col-size { display: none; }
}

@media (max-width: 576px) {
    .login-card { padding: 32px 24px; }
    .files-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 8px; }
    .file-card { padding: 12px; }
    .file-card .file-icon-large { font-size: 2rem; }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.fade-in { animation: fadeIn 0.3s ease; }

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
.pulse { animation: pulse 1.5s infinite; }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #c8c8c8; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #a0a0a0; }

/* ===== BADGE ===== */
.badge-dept {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 500;
}

/* ===== PROFILE ===== */
.profile-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    padding: 32px;
}

.profile-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 2rem;
    font-weight: 700;
}

/* ===== FOOTER ===== */
.app-footer {
    background: var(--bg-white);
    border-top: 1px solid var(--border-color);
    padding: 12px 0;
    margin-left: var(--sidebar-width);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.app-footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.app-footer a:hover {
    text-decoration: underline;
}

@media (max-width: 992px) {
    .app-footer { margin-left: 0; }
}

/* ===== LOGIN FOOTER ===== */
.login-footer {
    text-align: center;
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.login-footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

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

/* ===== MULTIMEDIA GALLERY ===== */
.media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}

.media-card {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
    position: relative;
}

.media-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.media-preview {
    position: relative;
    width: 100%;
    height: 180px;
    overflow: hidden;
    cursor: pointer;
    background: #f0f0f0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.media-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.media-card:hover .media-preview img { transform: scale(1.05); }

.media-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.media-preview:hover .media-overlay { opacity: 1; }

.media-video-thumb {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

.media-audio-thumb {
    width: 100%;
    height: 100px;
    background: linear-gradient(135deg, #fff3e0 0%, #ffe0b2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.media-audio { flex-direction: column; height: auto; padding-bottom: 8px; }
.media-audio audio { height: 36px; }

.media-info { padding: 12px; }

.media-name {
    font-weight: 500;
    font-size: 0.85rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 6px;
}

.media-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.media-actions {
    display: flex;
    gap: 4px;
    padding: 0 12px 12px;
    opacity: 0;
    transition: var(--transition);
}

.media-card:hover .media-actions { opacity: 1; }

.media-actions .btn {
    padding: 4px 8px;
    font-size: 0.75rem;
    border-radius: 4px;
}

.text-purple { color: #9c27b0 !important; }

@media (max-width: 576px) {
    .media-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 8px; }
    .media-preview { height: 130px; }
}