/* ============================================================
   SHARED DESIGN TOKENS & COMPONENT STYLES
   PayrollSystem - Modern SaaS UI
   ============================================================ */

/* --- Design Tokens --- */
:root {
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;

    /* Gray Scale */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* System Colors */
    --color-success: #059669;
    --color-success-light: #ecfdf5;
    --color-warning: #d97706;
    --color-warning-light: #fffbeb;
    --color-danger: #dc2626;
    --color-danger-light: #fef2f2;
    --color-info: #0284c7;
    --color-info-light: #f0f9ff;

    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

    /* Radii */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
}

/* --- Base Resets --- */
body {
    font-family: var(--font-sans);
    color: var(--gray-800);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Cards --- */
.card {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    border-bottom: 1px solid var(--gray-200);
    background: var(--gray-50);
    font-weight: 600;
    font-size: 0.875rem;
}

.card-header:first-child {
    border-radius: calc(var(--radius-lg) - 1px) calc(var(--radius-lg) - 1px) 0 0;
}

/* --- Tables --- */
.table {
    font-size: 0.875rem;
}

.table thead th {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-500);
    border-bottom-width: 2px;
    border-bottom-color: var(--gray-200);
    padding: 0.75rem;
}

.table tbody td {
    padding: 0.75rem;
    vertical-align: middle;
    color: var(--gray-700);
}

.table-hover tbody tr:hover {
    background-color: var(--gray-50);
}

.table-striped > tbody > tr:nth-of-type(odd) > * {
    background-color: rgba(0, 0, 0, 0.015);
}

/* --- Forms --- */
.form-control,
.form-select {
    border-radius: var(--radius-md);
    border-color: var(--gray-300);
    font-size: 0.875rem;
    padding: 0.5rem 0.75rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--focus-ring-color, #4f46e5);
    box-shadow: 0 0 0 3px var(--focus-ring-shadow, rgba(79, 70, 229, 0.15));
}

.form-label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.375rem;
}

.form-check-input:focus {
    border-color: var(--focus-ring-color, #4f46e5);
    box-shadow: 0 0 0 3px var(--focus-ring-shadow, rgba(79, 70, 229, 0.15));
}

/* --- Buttons --- */
.btn {
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.875rem;
    padding: 0.5rem 1rem;
    transition: all var(--transition-fast);
}

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

.btn:active {
    transform: translateY(0);
}

.btn-sm {
    font-size: 0.8125rem;
    padding: 0.375rem 0.75rem;
}

/* --- Badges --- */
.badge {
    font-weight: 500;
    font-size: 0.75rem;
    padding: 0.35em 0.65em;
    border-radius: var(--radius-sm);
}

/* --- Alerts --- */
.alert {
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    border: none;
}

.alert-info {
    background-color: var(--color-info-light);
    color: var(--color-info);
}

.alert-success {
    background-color: var(--color-success-light);
    color: var(--color-success);
}

.alert-warning {
    background-color: var(--color-warning-light);
    color: var(--color-warning);
}

.alert-danger {
    background-color: var(--color-danger-light);
    color: var(--color-danger);
}

/* --- Page Header --- */
.page-header {
    margin-bottom: 1.5rem;
}

.page-header h1,
.page-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.25rem;
}

.page-header p {
    color: var(--gray-500);
    font-size: 0.875rem;
    margin-bottom: 0;
}

/* --- Stat Cards --- */
.stat-card {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

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

.stat-card .stat-icon {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.125rem;
}

.stat-card .stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.2;
}

.stat-card .stat-label {
    font-size: 0.8125rem;
    color: var(--gray-500);
    font-weight: 500;
}

/* --- Action Cards (dashboard, masterdata) --- */
.action-card {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    background: white;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.action-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--gray-300);
}

.action-card .action-icon {
    width: 2.25rem;
    height: 2.25rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    margin-bottom: 0.75rem;
    flex-shrink: 0;
}

.action-card h5 {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.375rem;
}

.action-card p {
    font-size: 0.8125rem;
    color: var(--gray-500);
    margin-bottom: 1rem;
    flex-grow: 1;
}

/* --- Report Cards (left border accent) --- */
.report-card {
    border: 1px solid var(--gray-200);
    border-left: 3px solid var(--gray-400);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    background: white;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    height: 100%;
}

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

.report-card .report-icon {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.report-card h6 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.375rem;
}

.report-card p {
    font-size: 0.8125rem;
    color: var(--gray-500);
    margin-bottom: 1rem;
    flex-grow: 1;
}

/* --- Section Dividers --- */
.section-label {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--gray-400);
    margin-bottom: 0.75rem;
    margin-top: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--gray-100);
}

.section-label:first-child {
    margin-top: 0;
}

/* --- Empty States --- */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--gray-400);
}

.empty-state i {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

/* --- Utility --- */
.text-muted {
    color: var(--gray-500) !important;
}

code {
    font-family: var(--font-mono);
}

/* --- Theme Toggle Button --- */
.theme-toggle {
    background: none;
    border: 1px solid var(--gray-200);
    color: var(--gray-500);
    width: 2rem;
    height: 2rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.875rem;
    padding: 0;
}

.theme-toggle:hover {
    background: var(--gray-100);
    color: var(--gray-700);
    border-color: var(--gray-300);
}

.theme-toggle .bi-sun-fill { display: none; }
.theme-toggle .bi-moon-fill { display: inline; }

[data-theme="dark"] .theme-toggle .bi-sun-fill { display: inline; }
[data-theme="dark"] .theme-toggle .bi-moon-fill { display: none; }

/* ============================================================
   DARK MODE
   ============================================================ */
[data-theme="dark"] {
    --gray-50: #1a1a2e;
    --gray-100: #1f2037;
    --gray-200: #2a2b40;
    --gray-300: #3d3e56;
    --gray-400: #6b6d8a;
    --gray-500: #9496b3;
    --gray-600: #b8bad4;
    --gray-700: #d1d3e6;
    --gray-800: #e8e9f3;
    --gray-900: #f4f5fb;

    --color-success: #34d399;
    --color-success-light: rgba(52, 211, 153, 0.12);
    --color-warning: #fbbf24;
    --color-warning-light: rgba(251, 191, 36, 0.12);
    --color-danger: #f87171;
    --color-danger-light: rgba(248, 113, 113, 0.12);
    --color-info: #38bdf8;
    --color-info-light: rgba(56, 189, 248, 0.12);

    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.35), 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.35), 0 2px 4px -2px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.35), 0 4px 6px -4px rgba(0, 0, 0, 0.25);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.35), 0 8px 10px -6px rgba(0, 0, 0, 0.25);

    color-scheme: dark;
}

[data-theme="dark"] body {
    background: #0f0f1a;
    color: var(--gray-800);
}

/* Dark cards */
[data-theme="dark"] .card,
[data-theme="dark"] .stat-card,
[data-theme="dark"] .action-card,
[data-theme="dark"] .report-card {
    background: #16172b;
    border-color: var(--gray-200);
}

[data-theme="dark"] .card-header {
    background: var(--gray-100);
    border-color: var(--gray-200);
}

/* Dark forms */
[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
    background: #16172b;
    border-color: var(--gray-300);
    color: var(--gray-800);
}

[data-theme="dark"] .form-control::placeholder {
    color: var(--gray-400);
}

[data-theme="dark"] .form-control:disabled,
[data-theme="dark"] .form-select:disabled {
    background: var(--gray-100);
    color: var(--gray-500);
}

[data-theme="dark"] .form-check-input {
    background-color: #16172b;
    border-color: var(--gray-300);
}

/* Dark tables */
[data-theme="dark"] .table {
    --bs-table-bg: transparent;
    --bs-table-color: var(--gray-700);
    --bs-table-border-color: var(--gray-200);
    --bs-table-striped-bg: rgba(255, 255, 255, 0.02);
    --bs-table-hover-bg: rgba(255, 255, 255, 0.04);
}

[data-theme="dark"] .table thead th {
    border-bottom-color: var(--gray-200);
}

[data-theme="dark"] .table-light,
[data-theme="dark"] .table-light > th,
[data-theme="dark"] .table-light > td,
[data-theme="dark"] thead.table-light th,
[data-theme="dark"] tfoot.table-light td,
[data-theme="dark"] tr.table-light td {
    --bs-table-bg: rgba(255, 255, 255, 0.04) !important;
    --bs-table-color: var(--gray-700) !important;
    background-color: rgba(255, 255, 255, 0.04) !important;
    color: var(--gray-700) !important;
}

[data-theme="dark"] .table-secondary,
[data-theme="dark"] .table-secondary > th,
[data-theme="dark"] .table-secondary > td,
[data-theme="dark"] tfoot.table-secondary td,
[data-theme="dark"] tr.table-secondary td {
    --bs-table-bg: rgba(255, 255, 255, 0.02) !important;
    --bs-table-color: var(--gray-500) !important;
    background-color: rgba(255, 255, 255, 0.02) !important;
    color: var(--gray-500) !important;
}

/* Dark table variants (Bootstrap overrides for algorithm sheet, reconciliation, etc.) */
[data-theme="dark"] .table-warning,
[data-theme="dark"] .table-warning > th,
[data-theme="dark"] .table-warning > td,
[data-theme="dark"] tr.table-warning td,
[data-theme="dark"] tr.table-warning th {
    --bs-table-bg: rgba(255, 193, 7, 0.10) !important;
    --bs-table-color: #ffc978 !important;
    background-color: rgba(255, 193, 7, 0.10) !important;
    color: #ffc978 !important;
}

[data-theme="dark"] .table-danger,
[data-theme="dark"] .table-danger > th,
[data-theme="dark"] .table-danger > td,
[data-theme="dark"] tr.table-danger td,
[data-theme="dark"] tr.table-danger th {
    --bs-table-bg: rgba(220, 53, 69, 0.12) !important;
    --bs-table-color: #f08090 !important;
    background-color: rgba(220, 53, 69, 0.12) !important;
    color: #f08090 !important;
}

[data-theme="dark"] .table-success,
[data-theme="dark"] .table-success > th,
[data-theme="dark"] .table-success > td,
[data-theme="dark"] tr.table-success td,
[data-theme="dark"] tr.table-success th {
    --bs-table-bg: rgba(25, 135, 84, 0.12) !important;
    --bs-table-color: #6dd4a0 !important;
    background-color: rgba(25, 135, 84, 0.12) !important;
    color: #6dd4a0 !important;
}

[data-theme="dark"] .table-info,
[data-theme="dark"] .table-info > th,
[data-theme="dark"] .table-info > td,
[data-theme="dark"] tr.table-info td,
[data-theme="dark"] tr.table-info th {
    --bs-table-bg: rgba(13, 202, 240, 0.10) !important;
    --bs-table-color: #7ee8fc !important;
    background-color: rgba(13, 202, 240, 0.10) !important;
    color: #7ee8fc !important;
}

[data-theme="dark"] .table-primary,
[data-theme="dark"] .table-primary > th,
[data-theme="dark"] .table-primary > td,
[data-theme="dark"] tr.table-primary td,
[data-theme="dark"] tr.table-primary th {
    --bs-table-bg: rgba(99, 102, 241, 0.12) !important;
    --bs-table-color: #a5a7f7 !important;
    background-color: rgba(99, 102, 241, 0.12) !important;
    color: #a5a7f7 !important;
}

[data-theme="dark"] .table-dark,
[data-theme="dark"] .table-dark > th,
[data-theme="dark"] .table-dark > td,
[data-theme="dark"] tr.table-dark td,
[data-theme="dark"] tr.table-dark th {
    --bs-table-bg: rgba(255, 255, 255, 0.06) !important;
    --bs-table-color: var(--gray-800) !important;
    background-color: rgba(255, 255, 255, 0.06) !important;
    color: var(--gray-800) !important;
}

/* Dark Bootstrap overrides */
[data-theme="dark"] .bg-light {
    background-color: var(--gray-100) !important;
}

[data-theme="dark"] .bg-white {
    background-color: #16172b !important;
}

[data-theme="dark"] .border-bottom {
    border-color: var(--gray-200) !important;
}

[data-theme="dark"] .border-top {
    border-color: var(--gray-200) !important;
}

[data-theme="dark"] .list-group-item {
    background-color: #16172b;
    border-color: var(--gray-200);
    color: var(--gray-700);
}

[data-theme="dark"] .dropdown-menu {
    background-color: #16172b;
    border-color: var(--gray-200);
}

[data-theme="dark"] .dropdown-item {
    color: var(--gray-700);
}

[data-theme="dark"] .dropdown-item:hover {
    background-color: var(--gray-100);
    color: var(--gray-900);
}

[data-theme="dark"] .modal-content {
    background-color: #16172b;
    border-color: var(--gray-200);
}

[data-theme="dark"] .modal-header,
[data-theme="dark"] .modal-footer {
    border-color: var(--gray-200);
}

/* Dark card headers with bg-* colors */
[data-theme="dark"] .card-header.bg-primary { background-color: rgba(99, 102, 241, 0.25) !important; }
[data-theme="dark"] .card-header.bg-warning { background-color: rgba(255, 193, 7, 0.20) !important; }
[data-theme="dark"] .card-header.bg-danger { background-color: rgba(220, 53, 69, 0.20) !important; color: #f08090 !important; }
[data-theme="dark"] .card-header.bg-success { background-color: rgba(25, 135, 84, 0.20) !important; }
[data-theme="dark"] .card-header.bg-info { background-color: rgba(13, 202, 240, 0.15) !important; }
[data-theme="dark"] .card-header.bg-secondary { background-color: rgba(255, 255, 255, 0.08) !important; }
[data-theme="dark"] .card-header.bg-dark { background-color: rgba(255, 255, 255, 0.06) !important; }

/* Dark code blocks */
[data-theme="dark"] code {
    color: #c4b5fd;
    background-color: rgba(99, 102, 241, 0.10);
}

/* Dark bg-opacity helpers */
[data-theme="dark"] .bg-primary.bg-opacity-10 {
    background-color: rgba(99, 102, 241, 0.10) !important;
}

/* Dark text helpers */
[data-theme="dark"] .text-dark {
    color: var(--gray-800) !important;
}

[data-theme="dark"] .text-muted {
    color: var(--gray-500) !important;
}

[data-theme="dark"] a:not(.btn):not(.nav-link):not(.sidebar-link):not(.sidebar-logout):not(.navbar-brand) {
    color: var(--color-info);
}

/* Dark theme toggle override */
[data-theme="dark"] .theme-toggle {
    border-color: var(--gray-300);
    color: var(--gray-500);
}

[data-theme="dark"] .theme-toggle:hover {
    background: var(--gray-200);
    color: var(--gray-800);
    border-color: var(--gray-300);
}

/* Section label dark */
[data-theme="dark"] .section-label {
    border-bottom-color: var(--gray-200);
}

/* Pagination dark */
[data-theme="dark"] .page-link {
    background-color: #16172b;
    border-color: var(--gray-200);
    color: var(--gray-700);
}

[data-theme="dark"] .page-link:hover {
    background-color: var(--gray-100);
}

[data-theme="dark"] .page-item.active .page-link {
    background-color: var(--focus-ring-color, #4f46e5);
    border-color: var(--focus-ring-color, #4f46e5);
}