:root {
    /* Color Palette */
    --bg-main: #0b0c10;
    --bg-card: rgba(31, 40, 51, 0.4);
    --bg-glass: rgba(31, 40, 51, 0.6);
    --bg-glass-hover: rgba(31, 40, 51, 0.8);
    --border-glass: rgba(69, 162, 158, 0.2);

    --primary: #66fcf1;
    --primary-dim: rgba(102, 252, 241, 0.2);
    --secondary: #45a29e;

    --text-main: #ffffff;
    --text-muted: #c5c6c7;

    --danger: #ff4757;
    --success: #2ed573;
    --warning: #ffc107;

    --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --blur-glass: blur(12px);

    --font-main: 'Inter', sans-serif;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-main);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;

    /* Background abstract blobs */
    background-image:
        radial-gradient(circle at 15% 50%, rgba(69, 162, 158, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 85% 30%, rgba(102, 252, 241, 0.1) 0%, transparent 50%);
}

.glass-panel {
    background: var(--bg-glass);
    backdrop-filter: var(--blur-glass);
    -webkit-backdrop-filter: var(--blur-glass);
    border: 1px solid var(--border-glass);
    box-shadow: var(--shadow-glass);
    border-radius: 16px;
}

/* Layout */
.app-layout {
    display: flex;
    min-height: 100vh;
    position: relative;
}

/* Sidebar — overlay drawer on ALL screen sizes */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    padding: 24px;
    display: flex;
    flex-direction: column;
    background: rgba(11, 12, 16, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid var(--border-glass);
    transition: transform 0.3s ease;
    z-index: 1001;
    overflow-y: auto;
    overflow-x: hidden;
    /* Always hidden by default — opens via toggleNav() */
    transform: translateX(-100%);
}

/* Main Content — always full width, no left offset */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow-x: hidden;
    overflow-y: auto;
    padding: 24px;
    width: 100%;
}

/* Mobile */
@media screen and (max-width: 992px) {
    .main-content {
        padding: 16px;
    }

    .dashboard-grid {
        display: flex;
        flex-direction: column;
        gap: 16px;
    }

    .col-4,
    .col-5,
    .col-6,
    .col-7,
    .col-8,
    .col-12 {
        width: 100% !important;
    }

    .desktop-only {
        display: none !important;
    }

    .mobile-only {
        display: flex !important;
    }
}

@media screen and (min-width: 993px) {
    .desktop-only {
        display: flex !important;
    }

    .mobile-only {
        display: none !important;
    }
}

.sidebar-header {
    padding: 0 24px 32px;
    border-bottom: 1px solid var(--border-glass);
}

.sidebar-header h2 {
    color: var(--primary);
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.role-badge {
    background: var(--primary-dim);
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.sidebar-nav {
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 16px;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 12px;
    transition: var(--transition);
    font-weight: 500;
}

.nav-item:hover,
.nav-item.active {
    background: var(--primary-dim);
    color: var(--primary);
}

.nav-item.logout-link {
    margin-top: auto;
    color: var(--danger);
}

.nav-item.logout-link:hover {
    background: rgba(255, 71, 87, 0.1);
}

/* (Main Content rules now live in the unified layout block above) */

/* Topbar */
.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    height: 72px;
    margin-bottom: 16px;
}

.topbar-search {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 24px;
    padding: 8px 16px;
    width: 300px;
    border: 1px solid transparent;
    transition: var(--transition);
}

.topbar-search:focus-within {
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.1);
}

.topbar-search input {
    background: none;
    border: none;
    outline: none;
    color: var(--text-main);
    margin-left: 8px;
    width: 100%;
    font-family: var(--font-main);
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 24px;
}

/* Notifications */
.notification-wrapper {
    position: relative;
}

.icon-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-glass);
    color: var(--text-muted);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.icon-btn:hover {
    background: var(--primary-dim);
    color: var(--primary);
}

.badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--danger);
    color: white;
    font-size: 10px;
    font-weight: bold;
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 2px solid var(--bg-main);
}

.notification-dropdown {
    position: absolute;
    top: 50px;
    right: 0;
    width: 320px;
    display: none;
    flex-direction: column;
    z-index: 100;
    transform-origin: top right;
    animation: dropIn 0.3s ease;
}

.notification-dropdown.active {
    display: flex;
}

.dropdown-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-glass);
}

.dropdown-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.dropdown-body {
    max-height: 300px;
    overflow-y: auto;
}

.notif-item {
    display: flex;
    gap: 12px;
    padding: 16px;
    border-bottom: 1px solid var(--border-glass);
    transition: var(--transition);
    cursor: pointer;
}

.notif-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.notif-item.unread .notif-content p {
    font-weight: 600;
    color: var(--text-main);
}

.notif-icon {
    color: var(--secondary);
}

.notif-content p {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.notif-content small {
    font-size: 12px;
    color: var(--primary);
}

/* User Profile */
.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
    border: 2px solid var(--primary);
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    background: var(--primary-dim);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 18px;
}

.user-info {
    display: flex;
    flex-direction: column;
}

.username {
    font-weight: 600;
    font-size: 14px;
}

.department {
    font-size: 12px;
    color: var(--text-muted);
}

/* Page Container */
.page-container {
    flex: 1;
    overflow-y: auto;
    padding-right: 8px;
    /* For scrollbar */
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-glass);
    border-radius: 4px;
}

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

/* Grid Layouts for Dashboards */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 20px;
}

.card {
    padding: 24px;
    border-radius: 16px;
}

.col-12 {
    grid-column: span 12;
}

.col-8 {
    grid-column: span 8;
}

.col-4 {
    grid-column: span 4;
}

.col-6 {
    grid-column: span 6;
}

.col-3 {
    grid-column: span 3;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--text-muted);
}

.form-control {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    padding: 12px 16px;
    color: var(--text-main);
    font-family: var(--font-main);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.08);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-family: var(--font-main);
}

.btn-primary {
    background: var(--primary);
    color: var(--bg-main);
}

.btn-primary:hover {
    background: #52e0d4;
    box-shadow: 0 0 15px rgba(102, 252, 241, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-main);
    border: 1px solid var(--border-glass);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--primary);
    color: var(--primary);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 12px;
    border-radius: 6px;
    gap: 4px;
}

/* Lists */
.submission-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.list-item {
    padding: 16px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    transition: var(--transition);
}

.list-item:hover {
    background: rgba(255, 255, 255, 0.08);
}

.list-item-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
}

.item-date {
    color: var(--primary);
    font-size: 14px;
    font-weight: 500;
}

.item-desc {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.5;
}

/* Animations */
@keyframes dropIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* FullCalendar Resets for Dark Theme */
.fc-theme-standard .fc-scrollgrid {
    border-color: var(--border-glass);
}

.fc-theme-standard td,
.fc-theme-standard th {
    border-color: var(--border-glass);
}

.fc .fc-button-primary {
    background-color: var(--primary-dim);
    border-color: transparent;
    color: var(--primary);
}

.fc .fc-button-primary:not(:disabled):active,
.fc .fc-button-primary:not(:disabled).fc-button-active {
    background-color: var(--primary);
    color: var(--bg-main);
}

.fc-day-today {
    background: rgba(102, 252, 241, 0.1) !important;
}

/* Fix details summary marker alignment */
details>summary {
    list-style: none;
}

details>summary::-webkit-details-marker {
    display: none;
}

/* Fix browser default styling for select options */
select option {
    background-color: #0b0c10;
    color: #66fcf1;
}

/* (All responsive rules now live in the unified layout block above) */

/* --- Professional UI Overhaul --- */

/* Stat Cards */
.stat-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 24px;
    border-radius: 16px;
    background: linear-gradient(145deg, rgba(31, 40, 51, 0.9) 0%, rgba(11, 12, 16, 0.95) 100%);
    border: 1px solid rgba(69, 162, 158, 0.15);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
    border-color: rgba(102, 252, 241, 0.4);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.stat-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.2;
    margin-bottom: 8px;
}

.stat-trend {
    display: inline-flex;
    align-items: center;
    font-size: 12px;
    font-weight: 500;
    padding: 4px 8px;
    border-radius: 12px;
    gap: 4px;
}

.stat-trend.positive {
    color: var(--success);
    background: rgba(46, 213, 115, 0.1);
}

.stat-trend.negative {
    color: var(--danger);
    background: rgba(255, 71, 87, 0.1);
}

.stat-trend.neutral {
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.05);
}

.stat-trend.active {
    color: var(--primary);
    background: rgba(102, 252, 241, 0.08);
}

/* Advanced Tables */
.table-wrapper {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: 12px;
    overflow-x: auto;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.table-professional {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    color: var(--text-main);
    text-align: left;
    min-width: 800px;
}

.table-professional th {
    background: rgba(11, 12, 16, 0.6);
    padding: 16px 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    border-bottom: 2px solid rgba(69, 162, 158, 0.3);
    position: sticky;
    top: 0;
    z-index: 10;
}

.table-professional td {
    padding: 16px 20px;
    font-size: 14px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    background: transparent;
    transition: background 0.2s ease;
}

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

.table-professional tbody tr:hover td {
    background: rgba(102, 252, 241, 0.03);
}

/* Badges / Tags */
.badge-pro {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    gap: 4px;
}

.badge-primary {
    background: rgba(102, 252, 241, 0.15);
    color: var(--primary);
    border: 1px solid rgba(102, 252, 241, 0.3);
}

.badge-secondary {
    background: rgba(69, 162, 158, 0.15);
    color: var(--secondary);
    border: 1px solid rgba(69, 162, 158, 0.3);
}

.badge-success {
    background: rgba(46, 213, 115, 0.15);
    color: var(--success);
    border: 1px solid rgba(46, 213, 115, 0.3);
}

.badge-warning {
    background: rgba(255, 165, 2, 0.15);
    color: #ffa502;
    border: 1px solid rgba(255, 165, 2, 0.3);
}

/* Filter Toolbar */
.filter-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 16px 20px;
    border-radius: 12px;
    align-items: flex-end;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.filter-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
}

.filter-input {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    padding: 8px 12px;
    border-radius: 6px;
    outline: none;
    font-family: var(--font-main);
    font-size: 14px;
    min-width: 140px;
    transition: all 0.2s ease;
}

.filter-input:focus,
.filter-input:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(102, 252, 241, 0.5);
    box-shadow: 0 0 0 2px rgba(102, 252, 241, 0.1);
}

/* Page Headers */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.page-title {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 12px;
}

/* (Visibility utilities now live in the unified layout block above) */