/* CSS Variables & Reset */
:root {
    /* Color Palette - Premium Corporate Look (Dark Mode Default) */
    --primary-color: #3b82f6;
    /* Blue 500 */
    --primary-hover: #2563eb;
    /* Blue 600 */
    --secondary-color: #64748b;
    /* Slate 500 */
    --bg-color: #0f172a;
    /* Slate 900 */
    --sidebar-bg: #1e293b;
    /* Slate 800 */
    --card-bg: #1e293b;
    /* Slate 800 */
    --text-primary: #f8fafc;
    /* Slate 50 */
    --text-secondary: #94a3b8;
    /* Slate 400 */
    --border-color: #334155;
    /* Slate 700 */
    --success-color: #10b981;
    /* Emerald 500 */
    --warning-color: #f59e0b;
    /* Amber 500 */
    --danger-color: #ef4444;
    /* Red 500 */

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Transitions */
    --transition-speed: 0.3s;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Layout */
.app-container {
    display: flex;
    width: 100%;
}

.main-content {
    flex: 1;
    padding: var(--spacing-xl);
    margin-left: 280px;
    /* Space for the fixed left sidebar */
    transition: margin-left var(--transition-speed);
}

/* Sidebar - Left Sided */
.sidebar {
    width: 280px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-lg);
    z-index: 1000;
    box-shadow: 4px 0 15px rgba(0, 0, 0, 0.3);
}

.brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.brand span {
    color: var(--text-primary);
}

.nav-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    overflow-y: auto;
    flex: 1;
    /* Allow to take remaining space so it scrolls properly */
}

.nav-item a {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    text-decoration: none;
    color: var(--text-secondary);
    border-radius: 0.5rem;
    transition: all var(--transition-speed);
    font-weight: 500;
}

.nav-item a:hover,
.nav-item a.active {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
}

.nav-item i {
    width: 20px;
    text-align: center;
}

/* Dashboard / Page Content */
header {
    margin-bottom: var(--spacing-xl);
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.subtitle {
    color: var(--text-secondary);
}

/* Key Metrics Cards */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-speed);
}

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

.card-title {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.card-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.card-trend {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
}

.trend-up {
    color: var(--success-color);
}

.trend-down {
    color: var(--danger-color);
}

/* Table Styles */
.table-container {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    overflow: hidden;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background-color: rgba(0, 0, 0, 0.2);
    font-weight: 600;
    color: var(--text-secondary);
}

.data-table tr.category-header-row {
    background-color: var(--accent-color);
}

.data-table td.category-header {
    font-size: 1.1rem;
    color: var(--text-primary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 2px solid var(--border-color);
    border-bottom: 2px solid var(--border-color);
}

.data-table tr:hover:not(.category-header-row) {
    background-color: rgba(255, 255, 255, 0.02);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    text-decoration: none;
}

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

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

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeIn 0.5s ease-out forwards;
}

/* Modal Styles */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.2s ease-out;
}

.modal-content {
    background: var(--card-bg);
    border-radius: 1rem;
    width: 90%;
    max-width: 500px;
    padding: 1.5rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    transform: scale(0.95);
    animation: scaleIn 0.2s ease-out forwards;
    display: flex;
    flex-direction: column;
}

.modal-fullscreen-content {
    width: 100vw !important;
    height: 100vh !important;
    max-width: 100vw !important;
    border-radius: 0 !important;
    margin: 0 !important;
    overflow-y: auto;
}

@keyframes scaleIn {
    to {
        transform: scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.25rem;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.close-btn:hover {
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    background: var(--input-bg, #2d2d2d);
    color: var(--text-primary);
    font-size: 1rem;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 2rem;
}

/* Sidebar Sub-menu */
.nav-sub-menu {
    list-style: none;
    margin-top: 0.25rem;
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: 0.5rem;
    overflow: hidden;
}

.nav-sub-menu li a {
    padding: 0.75rem 1rem 0.75rem 3.5rem;
    /* Indent sub-items */
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: block;
    text-decoration: none;
    transition: all 0.2s;
}

.nav-sub-menu li a:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.05);
}

.nav-item .fa-chevron-down {
    transition: transform 0.3s;
}

.nav-item.open .fa-chevron-down {
    transform: rotate(180deg);
}

/* Module Layout Recovered Styles */
.customers-header, .page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.search-bar-container {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.search-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    color: var(--text-primary);
    font-size: 1rem;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.85rem;
    font-weight: 600;
}

/* Task Quick Add Popover */
.task-popover {
    display: none;
    position: absolute;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    border-radius: 0.5rem;
    padding: 1rem;
    z-index: 1000;
    width: 300px;
    flex-direction: column;
    gap: 0.75rem;
}
.task-popover input {
    width: 100%;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem;
    border-radius: 0.25rem;
}
.task-popover input:focus {
    outline: none;
    border-color: var(--primary-color);
}
.popover-actions {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
}

/* Calendar Component Advanced Overrides */

/* Force Global Deep Theme for FullCalendar Defaults */
.fc {
    --fc-page-bg-color: transparent !important;
    --fc-neutral-bg-color: rgba(255, 255, 255, 0.05) !important;
    --fc-border-color: rgba(255, 255, 255, 0.1) !important;
}
.fc-theme-standard {
    background: transparent !important;
}

/* Sleek Segmented Control for Year/Month/Week (Right side) */
.fc .fc-button-group {
    background: #1e293b;
    border-radius: 8px;
    padding: 4px;
    border: 1px solid #334155;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.1);
    display: inline-flex;
}
.fc .fc-button {
    background: transparent !important;
    border: none !important;
    color: #94a3b8 !important;
    border-radius: 6px !important;
    padding: 6px 16px !important;
    font-size: 0.85rem !important;
    font-weight: 500 !important;
    box-shadow: none !important;
    transition: all 0.2s ease;
    text-transform: capitalize;
    margin: 0 !important;
}
.fc .fc-button:hover {
    color: #f8fafc !important;
}
.fc .fc-button-active, .fc .fc-button:active {
    background: #334155 !important;
    color: #ffffff !important;
    box-shadow: 0 1px 3px rgba(0,0,0,0.3) !important;
}

/* Standalone Toolbar Buttons (Left side: Prev/Next/Today) */
.fc-toolbar-chunk:first-child {
    display: flex;
    gap: 8px;
    align-items: center;
}
.fc-toolbar-chunk:first-child .fc-button-group {
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 0;
    gap: 8px;
}
.fc-toolbar-chunk:first-child .fc-button {
    background: #1e293b !important;
    border: 1px solid #334155 !important;
    color: #e2e8f0 !important;
    box-shadow: 0 1px 2px rgba(0,0,0,0.1) !important;
}
.fc-toolbar-chunk:first-child .fc-button:hover {
    background: #334155 !important;
    color: #ffffff !important;
}

/* Toolbar Title */
.fc .fc-toolbar-title {
    font-size: 1.35rem !important;
    font-weight: 600;
    color: #f1f5f9;
}
.fc .fc-toolbar {
    margin-bottom: 2rem !important;
}

/* Year View (3x4 Grid) */
.fc .fc-multimonth {
    border: none !important;
    display: grid !important;
    grid-template-columns: repeat(3, 1fr) !important;
    gap: 2rem 1.5rem !important;
    padding: 0 !important;
    background: transparent !important;
}
.fc-multimonth-month {
    background: #1e293b !important; /* Deep Slate Card Background */
    border: 1px solid #334155 !important;
    border-radius: 0.75rem !important;
    padding: 1rem !important;
    margin: 0 !important;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1) !important;
}

/* Year View Title (Months) */
.fc-multimonth-title {
    font-weight: 600 !important;
    font-size: 1.1rem !important;
    color: #f1f5f9 !important; /* Bright White */
    text-align: left !important;
    margin-bottom: 0.75rem !important;
    padding-bottom: 0.5rem !important;
    padding-left: 0.5rem;
    border-bottom: 1px solid #334155 !important;
}

/* Calendar Tables (Year View) */
.fc-multimonth-header th {
    color: #94a3b8 !important; /* Slate-400 */
    font-size: 0.75rem !important;
    font-weight: 600 !important;
    padding-bottom: 0.5rem !important;
    border: none !important;
    text-transform: uppercase;
    background: transparent !important;
}
.fc-multimonth-daygrid-table td, .fc-multimonth-daygrid-table th, .fc-multimonth-daygrid-table {
    border: none !important;
    background: transparent !important;
}

/* Clean Day Numbers */
.fc-multimonth-day .fc-daygrid-day-number {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 2px auto;
    font-size: 0.85rem;
    color: #e2e8f0 !important; /* Crisp Readable White */
    border-radius: 50%;
    position: relative;
    z-index: 2;
}
.fc .fc-day-other .fc-daygrid-day-number {
    color: #475569 !important; /* faded dark slate out other month dates */
}

/* Remove ugly background from 'Today' table cell and put it on dot */
.fc-day-today {
    background: transparent !important;
}
.fc .fc-multimonth .fc-day-today .fc-daygrid-day-number {
    background: var(--primary-color) !important;
    color: #ffffff !important;
    font-weight: 600;
}

/* Minimalist Event Dots in Year View (Tasks Marker) */
.fc-multimonth td {
    position: relative !important;
}
.fc-multimonth .fc-daygrid-event-harness {
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}
.fc-multimonth .fc-event {
    width: 5px !important;
    height: 5px !important;
    border-radius: 50% !important;
    margin: 0 !important;
    padding: 0 !important;
    display: inline-block !important;
    color: transparent !important;
}
.fc-multimonth .fc-event-title, .fc-multimonth .fc-event-time {
    display: none !important;
}

/* Standard Month/Week Calendar Grids override */
.fc-theme-standard td, .fc-theme-standard th, .fc-theme-standard .fc-scrollgrid {
    border-color: rgba(255, 255, 255, 0.05) !important;
    background: transparent !important; 
}