html[data-theme="dark"] {
    --cal-surface: #1f2937;
    --cal-surface-2: #374151;
    --cal-surface-3: #111827;
    --cal-surface-soft: #243142;
    --cal-border: #374151;
    --cal-border-soft: #4b5563;
    --cal-text: #f9fafb;
    --cal-text-soft: #cbd5e1;
    --cal-text-muted: #94a3b8;
    --cal-shadow: 0 12px 28px rgba(0, 0, 0, 0.28);
    --cal-header-bg: linear-gradient(135deg, #374151 0%, #111827 100%);
    --cal-primary: #4f46e5;
    --cal-primary-hover: #4338ca;
    --cal-secondary-bg: #374151;
    --cal-secondary-hover: #4b5563;
    --cal-secondary-text: #f9fafb;
    --cal-danger: #ef4444;
    --cal-danger-hover: #dc2626;
    --cal-input-bg: #111827;
    --cal-input-border: #4b5563;
    --cal-input-text: #f9fafb;
    --cal-modal-overlay: rgba(0, 0, 0, 0.55);
    --cal-modal-bg: #1f2937;
    --cal-event-details-bg: #111827;
    --cal-today-bg: rgba(79, 70, 229, 0.18);
}

html[data-theme="light"] {
    --cal-surface: #ffffff;
    --cal-surface-2: #f4f8fc;
    --cal-surface-3: #eef4fa;
    --cal-surface-soft: #f9fbfe;
    --cal-border: #dbe4ef;
    --cal-border-soft: #d1d9e6;
    --cal-text: #1f2937;
    --cal-text-soft: #475467;
    --cal-text-muted: #6b7280;
    --cal-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
    --cal-header-bg: linear-gradient(135deg, #4f8fda 0%, #6aa7d8 100%);
    --cal-primary: #3b82f6;
    --cal-primary-hover: #2563eb;
    --cal-secondary-bg: #f3f4f6;
    --cal-secondary-hover: #e5e7eb;
    --cal-secondary-text: #374151;
    --cal-danger: #ef4444;
    --cal-danger-hover: #dc2626;
    --cal-input-bg: #ffffff;
    --cal-input-border: #d1d5db;
    --cal-input-text: #1f2937;
    --cal-modal-overlay: rgba(17, 24, 39, 0.35);
    --cal-modal-bg: #ffffff;
    --cal-event-details-bg: #f9fafb;
    --cal-today-bg: rgba(59, 130, 246, 0.10);
}

#content-calendar .erp-calendar-container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--cal-surface);
    color: var(--cal-text);
    border-radius: 12px;
    box-shadow: var(--cal-shadow);
    overflow: hidden;
    border: 1px solid var(--cal-border);
}

#content-calendar .calendar-header {
    background: var(--cal-header-bg);
    color: #ffffff;
    padding: 24px;
}

#content-calendar .calendar-header h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
}

#content-calendar .calendar-header p {
    opacity: 0.9;
    font-size: 14px;
}

#content-calendar .calendar-controls {
    padding: 20px;
    border-bottom: 1px solid var(--cal-border);
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
    background: var(--cal-surface);
}

#content-calendar .btn {
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

#content-calendar .btn-primary {
    background: var(--cal-primary);
    color: white;
}

#content-calendar .btn-primary:hover {
    background: var(--cal-primary-hover);
}

#content-calendar .btn-secondary {
    background: var(--cal-secondary-bg);
    color: var(--cal-secondary-text);
    border: 1px solid var(--cal-border-soft);
}

#content-calendar .btn-secondary:hover {
    background: var(--cal-secondary-hover);
}

#content-calendar .btn-danger {
    background: var(--cal-danger);
    color: white;
}

#content-calendar .btn-danger:hover {
    background: var(--cal-danger-hover);
}

#content-calendar .calendar-body {
    padding: 20px;
    background: var(--cal-surface);
}

#content-calendar #calendar {
    max-width: 100%;
}

#content-calendar .fc {
    background: var(--cal-surface);
    color: var(--cal-text);
}

#content-calendar .fc-toolbar-title {
    font-size: 1.5rem !important;
    font-weight: 600 !important;
    color: var(--cal-text) !important;
}

#content-calendar .fc-button-primary {
    background: var(--cal-primary) !important;
    border-color: var(--cal-primary) !important;
}

#content-calendar .fc-button-primary:hover {
    background: var(--cal-primary-hover) !important;
    border-color: var(--cal-primary-hover) !important;
}

#content-calendar .fc-button-primary:not(:disabled).fc-button-active,
#content-calendar .fc-button-primary:focus {
    box-shadow: none !important;
}

#content-calendar .fc-scrollgrid,
#content-calendar .fc-theme-standard td,
#content-calendar .fc-theme-standard th {
    border-color: var(--cal-border) !important;
}

#content-calendar .fc-col-header {
    background: var(--cal-surface-2);
}

#content-calendar .fc-col-header-cell-cushion,
#content-calendar .fc-daygrid-day-number,
#content-calendar .fc-list-day-text,
#content-calendar .fc-list-day-side-text {
    color: var(--cal-text-soft);
}

#content-calendar .fc-daygrid-day,
#content-calendar .fc-timegrid-slot,
#content-calendar .fc-timegrid-axis,
#content-calendar .fc-timegrid-col {
    background: var(--cal-surface);
}

#content-calendar .fc-day-today {
    background-color: var(--cal-today-bg) !important;
}

#content-calendar .fc-popover {
    background: var(--cal-surface);
    border: 1px solid var(--cal-border);
    color: var(--cal-text);
}

#content-calendar .fc-popover-header {
    background: var(--cal-surface-2);
    color: var(--cal-text);
}

#content-calendar .fc-event {
    border-radius: 4px !important;
    padding: 2px 4px !important;
}

#content-calendar .event-high-priority {
    background: #ef4444 !important;
    border-color: #dc2626 !important;
}

#content-calendar .event-medium-priority {
    background: #f59e0b !important;
    border-color: #d97706 !important;
}

#content-calendar .event-low-priority {
    background: #10b981 !important;
    border-color: #059669 !important;
}

#content-calendar .status-indicator {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 8px;
}

#content-calendar .status-active { background: #10b981; }
#content-calendar .status-pending { background: #f59e0b; }
#content-calendar .status-cancelled { background: #ef4444; }

#content-calendar .modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: var(--cal-modal-overlay);
}

#content-calendar .modal-content {
    background-color: var(--cal-modal-bg);
    color: var(--cal-text);
    margin: 10% auto;
    padding: 24px;
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    box-shadow: var(--cal-shadow);
    border: 1px solid var(--cal-border);
}

#content-calendar .modal-header {
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--cal-border);
}

#content-calendar .modal-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--cal-text);
}

#content-calendar .close {
    float: right;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    color: var(--cal-text-muted);
}

#content-calendar .close:hover {
    color: var(--cal-text-soft);
}

#content-calendar .form-group {
    margin-bottom: 16px;
}

#content-calendar .form-label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--cal-text-soft);
}

#content-calendar .form-input,
#content-calendar .form-select,
#content-calendar .form-textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--cal-input-border);
    border-radius: 6px;
    font-size: 14px;
    color: var(--cal-input-text);
    background: var(--cal-input-bg);
    box-sizing: border-box;
}

#content-calendar .form-textarea {
    resize: vertical;
    min-height: 80px;
}

#content-calendar .event-details {
    background: var(--cal-event-details-bg);
    padding: 16px;
    border-radius: 8px;
    margin: 16px 0;
    border: 1px solid var(--cal-border);
}

#content-calendar .event-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 12px;
    font-size: 14px;
    color: var(--cal-text-muted);
}