:root {
    /* Color Palette */
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    --bg-main: #f8fafc;
    --bg-surface: #ffffff;
    --bg-sidebar: #0f172a;
    
    --text-main: #1e293b;
    --text-muted: #64748b;
    --text-light: #f8fafc;

    --border-color: #e2e8f0;

    /* Shadows */
    --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);
    
    /* Radius */
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    overflow: hidden; /* We handle scrolling inside components */
}

.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    color: var(--text-light);
    display: flex;
    flex-direction: column;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-lg);
    z-index: 10;
}

.sidebar-header {
    height: 70px;
    display: flex;
    align-items: center;
    padding: 0 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.logo-icon {
    color: var(--primary);
    font-size: 1.5rem;
}

.nav-links {
    list-style: none;
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav-item {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
    color: #94a3b8;
    transition: var(--transition-fast);
}

.nav-item i {
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
}

.nav-item:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-light);
}

.nav-item.active {
    background-color: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.top-header {
    height: 70px;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    z-index: 5;
    box-shadow: var(--shadow-sm);
}

.header-title h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-main);
}

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

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
    cursor: pointer;
}

.avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    border: 2px solid var(--border-color);
}

/* Content Area */
.content-area {
    flex: 1;
    padding: 32px;
    overflow-y: auto;
    scroll-behavior: smooth;
}

/* Cards & Surfaces */
.card {
    background-color: var(--bg-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 24px;
    border: 1px solid var(--border-color);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition-fast);
    border: none;
    outline: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
    transform: translateY(-1px);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-main);
}

.btn-outline:hover {
    background-color: var(--bg-main);
    border-color: #cbd5e1;
}

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

.btn-danger:hover {
    background-color: #dc2626;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.2);
}

/* Forms */
.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--text-main);
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--bg-surface);
    color: var(--text-main);
    font-size: 0.875rem;
    transition: var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2364748b'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
    padding-right: 40px;
}

/* Tables */
.table-container {
    width: 100%;
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.data-table th,
.data-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    font-weight: 600;
    color: var(--text-muted);
    background-color: var(--bg-main);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
}

.data-table tbody tr {
    transition: var(--transition-fast);
}

.data-table tbody tr:hover {
    background-color: var(--primary-light);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 8px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-success { background-color: #d1fae5; color: #047857; }
.badge-warning { background-color: #fef3c7; color: #b45309; }
.badge-primary { background-color: #dbeafe; color: #1d4ed8; }

/* Grid Layouts */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 50;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-fast);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--bg-surface);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    transform: scale(0.95);
    transition: var(--transition-fast);
}

.modal-overlay.active .modal-content {
    transform: scale(1);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition-fast);
}

.modal-close:hover {
    color: var(--text-main);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    background-color: var(--bg-main);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.3s ease-out forwards;
}

/* Utility */
.text-right { text-align: right; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }

/* Dashboard Widgets */
.stat-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    background-color: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
}

.stat-details h3 {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 4px;
}

.stat-details p {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
}

/* Login Overlay */
.login-overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background-color: var(--bg-main); z-index: 9999; display: none; justify-content: center; align-items: center; padding: 20px; }
.login-overlay.active { display: flex; }
.login-card { background-color: var(--bg-surface); padding: 40px; border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); width: 100%; max-width: 400px; border: 1px solid var(--border-color); }

/* Calendar Grid Styles */
.calendar-container {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.calendar-header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    background-color: var(--bg-surface);
    padding: 16px 24px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.calendar-title-nav {
    display: flex;
    align-items: center;
    gap: 16px;
}

.calendar-title-nav h3 {
    font-size: 1.25rem;
    font-weight: 600;
    min-width: 150px;
    text-align: center;
}

.calendar-nav-btn {
    background: none;
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    color: var(--text-main);
}

.calendar-nav-btn:hover {
    background-color: var(--bg-main);
}

.calendar-view-toggle {
    display: flex;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.calendar-view-toggle button {
    background-color: var(--bg-surface);
    border: none;
    padding: 8px 16px;
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
}

.calendar-view-toggle button.active {
    background-color: var(--primary);
    color: white;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
    background-color: var(--border-color);
    padding: 8px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.calendar-weekday {
    text-align: center;
    font-weight: 600;
    font-size: 0.75rem;
    color: var(--text-muted);
    padding: 8px 0;
    background-color: var(--bg-main);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: var(--radius-md);
}

.calendar-day {
    min-height: 110px;
    background-color: var(--bg-surface);
    border-radius: var(--radius-md);
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    transition: var(--transition-fast);
    cursor: pointer;
    border: 1px solid transparent;
}

.calendar-day:hover {
    box-shadow: var(--shadow-md);
    border-color: #cbd5e1;
}

.calendar-day.today {
    background-color: var(--primary-light);
    border-color: var(--primary);
}

.calendar-day.other-month {
    background-color: #f1f5f9;
    color: #94a3b8;
    opacity: 0.5;
    cursor: default;
}

.calendar-day-number {
    font-weight: 600;
    font-size: 0.875rem;
    align-self: flex-end;
    color: var(--text-main);
}

.calendar-day.today .calendar-day-number {
    color: var(--primary);
}

.calendar-events {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex-grow: 1;
    overflow-y: auto;
    max-height: 80px;
}

.calendar-event-item {
    font-size: 0.7rem;
    padding: 3px 6px;
    border-radius: 4px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: var(--transition-fast);
}

.calendar-event-item:hover {
    transform: scale(1.02);
}

/* Calendar Week & Day Views */
.calendar-week-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 12px;
    background-color: var(--border-color);
    padding: 12px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    margin-top: 16px;
}

.calendar-week-column {
    background-color: var(--bg-surface);
    border-radius: var(--radius-md);
    padding: 12px;
    min-height: 400px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    border: 1px solid transparent;
    transition: var(--transition-fast);
    cursor: pointer;
}

.calendar-week-column:hover {
    box-shadow: var(--shadow-md);
    border-color: #cbd5e1;
}

.calendar-week-column.today {
    background-color: var(--primary-light);
    border-color: var(--primary);
}

.calendar-week-day-header {
    display: flex;
    flex-direction: column;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 8px;
    margin-bottom: 8px;
}

.calendar-week-day-name {
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.calendar-week-day-date {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-main);
}

.calendar-week-column.today .calendar-week-day-date {
    color: var(--primary);
}

.calendar-day-view-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 16px;
}

.calendar-day-details-card {
    background-color: var(--bg-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 24px;
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.calendar-day-order-card {
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-fast);
}

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

.calendar-day-order-info {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.calendar-day-order-title {
    font-size: 1.15rem;
    font-weight: 700;
}

.calendar-day-order-meta {
    display: flex;
    gap: 16px;
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Responsive adjustments for Mobile/Tablet */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        z-index: 1000;
        transform: translateX(-100%);
    }
    .sidebar.active {
        transform: translateX(0);
    }
    #menu-toggle {
        display: inline-flex !important;
    }
    .top-header {
        padding: 0 16px;
    }
    .content-area {
        padding: 16px;
    }
    
    /* Make grids responsive */
    .grid-2, .grid-3, .grid-4, .calendar-week-grid, .calendar-grid {
        grid-template-columns: 1fr !important;
    }
    
    /* Adapt calendar days layout in week view for mobile */
    .calendar-week-column {
        min-height: auto !important;
    }

    /* Adapt grid view cells on mobile */
    .calendar-day {
        min-height: 80px !important;
    }
    
    .header-actions {
        gap: 8px;
    }
    .time-widget {
        display: none; /* Hide timers to save space on mobile */
    }
    
    .sidebar-overlay {
        position: fixed;
        top: 0; left: 0; right: 0; bottom: 0;
        background: rgba(0, 0, 0, 0.4);
        z-index: 999;
        display: none;
    }
    .sidebar-overlay.active {
        display: block;
    }
}

/* Payslip Upload Dropzone */
.file-dropzone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 30px;
    text-align: center;
    background-color: var(--bg-main);
    cursor: pointer;
    transition: var(--transition-fast);
}

.file-dropzone:hover {
    border-color: var(--primary);
    background-color: rgba(13, 138, 188, 0.03);
}

.payslip-month-group {
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 16px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
}