/* Material Design-Inspired CSS Framework */
/* National Defence Service HRM Application */

/* ============================================================================
   1. CSS CUSTOM PROPERTIES (Variables)
   ============================================================================ */

:root {
    /* Primary Color Palette */
    --color-primary: #1976d2;
    --color-primary-light: #42a5f5;
    --color-primary-dark: #1565c0;
    --color-primary-50: #e3f2fd;
    --color-primary-100: #bbdefb;
    --color-primary-200: #90caf9;
    --color-primary-300: #64b5f6;
    --color-primary-400: #42a5f5;
    --color-primary-500: #2196f3;
    --color-primary-600: #1e88e5;
    --color-primary-700: #1976d2;
    --color-primary-800: #1565c0;
    --color-primary-900: #0d47a1;

    /* Secondary Color Palette (Accent) */
    --color-secondary: #f57c00;
    --color-secondary-light: #ffb74d;
    --color-secondary-dark: #e65100;

    /* Neutral Colors */
    --color-surface: #ffffff;
    --color-surface-variant: #f5f5f5;
    --color-surface-inverse: #1e1e1e;
    --color-on-surface: #1e1e1e;
    --color-on-surface-variant: #47474e;
    --color-outline: #79747e;
    --color-outline-variant: #cac7d0;

    /* Status Colors */
    --color-success: #4caf50;
    --color-success-light: #81c784;
    --color-warning: #ff9800;
    --color-warning-light: #ffb74d;
    --color-error: #f44336;
    --color-error-light: #ef5350;
    --color-info: #2196f3;
    --color-info-light: #64b5f6;

    /* Typography */
    --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
    --font-family-mono: 'Courier New', monospace;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;

    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-loose: 1.75;

    /* Spacing System (4px base unit) */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 2.5rem;
    --spacing-3xl: 3rem;
    --spacing-4xl: 4rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Shadows (Material Design Elevation) */
    --shadow-none: none;
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;

    /* Z-index Scale */
    --z-hide: -1;
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal-backdrop: 300;
    --z-modal: 400;
    --z-tooltip: 500;
    --z-notification: 600;
}

/* Dark Mode Support (optional) */
@media (prefers-color-scheme: dark) {
    :root {
        --color-surface: #1e1e1e;
        --color-surface-variant: #2c2c2c;
        --color-surface-inverse: #ffffff;
        --color-on-surface: #ffffff;
        --color-on-surface-variant: #cac7d0;
        --color-outline: #938f99;
        --color-outline-variant: #49454e;
    }
}

/* ============================================================================
   2. GLOBAL STYLES & RESET
   ============================================================================ */

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

*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-normal);
    color: var(--color-on-surface);
    background-color: var(--color-surface-variant);
    transition: background-color var(--transition-base);
}

/* ============================================================================
   3. TYPOGRAPHY
   ============================================================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-md);
    color: var(--color-on-surface);
}

h1 {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
}

h2 {
    font-size: var(--font-size-3xl);
}

h3 {
    font-size: var(--font-size-2xl);
}

h4 {
    font-size: var(--font-size-xl);
}

h5 {
    font-size: var(--font-size-lg);
}

h6 {
    font-size: var(--font-size-base);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

p {
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-normal);
}

small {
    font-size: var(--font-size-sm);
}

strong {
    font-weight: var(--font-weight-bold);
}

em {
    font-style: italic;
}

code,
pre {
    font-family: var(--font-family-mono);
    background-color: var(--color-surface-variant);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
}

pre {
    overflow-x: auto;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

/* ============================================================================
   4. BUTTONS
   ============================================================================ */

button,
[role="button"],
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);

    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);

    padding: var(--spacing-md) var(--spacing-xl);
    border: 2px solid transparent;
    border-radius: var(--radius-md);

    background-color: var(--color-primary);
    color: white;

    cursor: pointer;
    user-select: none;
    text-decoration: none;
    white-space: nowrap;

    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);

    position: relative;
    overflow: hidden;
}

button:hover,
[role="button"]:hover,
.btn:hover {
    background-color: var(--color-primary-dark);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

button:active,
[role="button"]:active,
.btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

button:focus,
[role="button"]:focus,
.btn:focus {
    outline: 2px solid var(--color-primary-light);
    outline-offset: 2px;
}

button:disabled,
[role="button"]:disabled,
.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    box-shadow: none;
}

/* Button Variants */

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

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

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

.btn-success:hover {
    background-color: #45a049;
}

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

.btn-danger:hover,
.btn-error:hover {
    background-color: #da190b;
}

.btn-warning {
    background-color: var(--color-warning);
    color: #000;
}

.btn-warning:hover {
    background-color: #e68900;
}

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

.btn-info:hover {
    background-color: #1976d2;
}

/* Outlined Button */

.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-primary-50);
    box-shadow: var(--shadow-md);
}

/* Text Button */

.btn-text {
    background-color: transparent;
    color: var(--color-primary);
    box-shadow: none;
    padding: var(--spacing-md) var(--spacing-lg);
}

.btn-text:hover {
    background-color: var(--color-primary-50);
    box-shadow: var(--shadow-sm);
}

/* Size Variants */

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

.btn-block {
    width: 100%;
}

/* Icon Button */

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

/* ============================================================================
   5. FORMS & INPUT ELEMENTS
   ============================================================================ */

input,
textarea,
select {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
}

label {
    display: block;
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-sm);
    color: var(--color-on-surface);
}

input[type="text"],
input[type="password"],
input[type="email"],
input[type="number"],
input[type="date"],
input[type="time"],
input[type="datetime-local"],
input[type="month"],
input[type="week"],
input[type="tel"],
input[type="url"],
input[type="search"],
textarea,
select {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--color-outline-variant);
    border-radius: var(--radius-md);
    background-color: var(--color-surface);
    color: var(--color-on-surface);
    transition: all var(--transition-fast);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
}

input[type="text"]:focus,
input[type="password"]:focus,
input[type="email"]:focus,
input[type="number"]:focus,
input[type="date"]:focus,
input[type="time"]:focus,
input[type="datetime-local"]:focus,
input[type="month"]:focus,
input[type="week"]:focus,
input[type="tel"]:focus,
input[type="url"]:focus,
input[type="search"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-50);
}

textarea {
    resize: vertical;
    min-height: 120px;
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--spacing-md) center;
    background-size: 20px;
    padding-right: var(--spacing-2xl);
}

input[type="checkbox"],
input[type="radio"] {
    width: 20px;
    height: 20px;
    margin-right: var(--spacing-sm);
    cursor: pointer;
    accent-color: var(--color-primary);
}

input[type="checkbox"]:focus,
input[type="radio"]:focus {
    outline: 2px solid var(--color-primary-light);
    outline-offset: 2px;
}

/* Form Groups */

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    margin-bottom: var(--spacing-md);
}

.form-inline {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-end;
}

.form-inline>* {
    flex: 1;
}

/* Help Text & Errors */

.form-text,
.help-text {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-on-surface-variant);
    margin-top: var(--spacing-xs);
}

.form-error,
.error-text {
    color: var(--color-error);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
}

input.error,
textarea.error,
select.error {
    border-color: var(--color-error);
    box-shadow: 0 0 0 3px rgba(244, 67, 54, 0.1);
}

/* ============================================================================
   6. CARDS & CONTAINERS
   ============================================================================ */

.card,
.panel,
.box {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.card-header {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-outline-variant);
    margin-bottom: var(--spacing-md);
}

.card-body {
    margin-bottom: var(--spacing-md);
}

.card-footer {
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-outline-variant);
    text-align: right;
}

.card-footer button {
    margin-left: var(--spacing-md);
}

/* Elevation / Shadow Variants */

.elevation-1 {
    box-shadow: var(--shadow-sm);
}

.elevation-2 {
    box-shadow: var(--shadow-md);
}

.elevation-3 {
    box-shadow: var(--shadow-lg);
}

.elevation-4 {
    box-shadow: var(--shadow-xl);
}

/* ============================================================================
   7. ALERTS & NOTIFICATIONS
   ============================================================================ */

.alert,
.notification {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    animation: slideIn var(--transition-base) ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

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

.alert-success,
.notification-success {
    background-color: #e8f5e9;
    color: #2e7d32;
    border-left: 4px solid var(--color-success);
}

.alert-error,
.alert-danger,
.notification-error {
    background-color: #ffebee;
    color: #c62828;
    border-left: 4px solid var(--color-error);
}

.alert-warning,
.notification-warning {
    background-color: #fff3e0;
    color: #e65100;
    border-left: 4px solid var(--color-warning);
}

.alert-info,
.notification-info {
    background-color: #e3f2fd;
    color: #1565c0;
    border-left: 4px solid var(--color-info);
}

.alert-close {
    margin-left: auto;
    cursor: pointer;
    font-size: var(--font-size-lg);
    opacity: 0.6;
    transition: opacity var(--transition-fast);
}

.alert-close:hover {
    opacity: 1;
}

/* ============================================================================
   8. TABLES
   ============================================================================ */

table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--color-surface);
    box-shadow: var(--shadow-sm);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}

table thead {
    background-color: var(--color-primary);
    color: white;
}

table th {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: left;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 2px solid var(--color-primary-dark);
}

table td {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-outline-variant);
}

table tbody tr {
    transition: background-color var(--transition-fast);
}

table tbody tr:hover {
    background-color: var(--color-surface-variant);
}

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

table.striped tbody tr:nth-child(odd) {
    background-color: var(--color-surface-variant);
}

table.striped tbody tr:nth-child(odd):hover {
    background-color: #e0e0e0;
}

/* ============================================================================
   9. NAVIGATION & SIDEBAR
   ============================================================================ */

.navbar,
nav {
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.navbar a,
nav a {
    color: white;
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.navbar a:hover,
nav a:hover {
    opacity: 0.8;
}

.navbar-brand {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-right: var(--spacing-xl);
}

.navbar-nav {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.sidebar {
    width: 260px;
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-lg);
    min-height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    overflow-y: auto;
    z-index: var(--z-sticky);
    box-shadow: var(--shadow-lg);
}

.sidebar h2,
.sidebar h3 {
    color: white;
    margin-bottom: var(--spacing-lg);
}

.sidebar ul {
    list-style: none;
}

.sidebar li {
    margin-bottom: var(--spacing-sm);
}

.sidebar a {
    display: block;
    padding: var(--spacing-md) var(--spacing-lg);
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-weight: var(--font-weight-regular);
}

.sidebar a:hover,
.sidebar a.active {
    background-color: rgba(255, 255, 255, 0.15);
    color: white;
    font-weight: var(--font-weight-medium);
    padding-left: var(--spacing-2xl);
}

/* Sidebar divider */
.sidebar hr {
    border: none;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    margin: var(--spacing-lg) 0;
}

/* Main content with sidebar */
.layout-sidebar {
    display: flex;
}

.layout-sidebar main {
    flex: 1;
    margin-left: 260px;
    padding: var(--spacing-xl);
}

/* ============================================================================
   10. GRID & LAYOUT
   ============================================================================ */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.flex {
    display: flex;
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.flex-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.flex-column {
    flex-direction: column;
}

.gap-sm {
    gap: var(--spacing-sm);
}

.gap-md {
    gap: var(--spacing-md);
}

.gap-lg {
    gap: var(--spacing-lg);
}

.gap-xl {
    gap: var(--spacing-xl);
}

/* Margins & Padding Utilities */

.m-0 {
    margin: 0;
}

.m-xs {
    margin: var(--spacing-xs);
}

.m-sm {
    margin: var(--spacing-sm);
}

.m-md {
    margin: var(--spacing-md);
}

.m-lg {
    margin: var(--spacing-lg);
}

.m-xl {
    margin: var(--spacing-xl);
}

.mt-sm {
    margin-top: var(--spacing-sm);
}

.mt-md {
    margin-top: var(--spacing-md);
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mt-xl {
    margin-top: var(--spacing-xl);
}

.mb-sm {
    margin-bottom: var(--spacing-sm);
}

.mb-md {
    margin-bottom: var(--spacing-md);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

.mb-xl {
    margin-bottom: var(--spacing-xl);
}

.p-0 {
    padding: 0;
}

.p-xs {
    padding: var(--spacing-xs);
}

.p-sm {
    padding: var(--spacing-sm);
}

.p-md {
    padding: var(--spacing-md);
}

.p-lg {
    padding: var(--spacing-lg);
}

.p-xl {
    padding: var(--spacing-xl);
}

.px-sm {
    padding-left: var(--spacing-sm);
    padding-right: var(--spacing-sm);
}

.px-md {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
}

.px-lg {
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
}

.py-sm {
    padding-top: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
}

.py-md {
    padding-top: var(--spacing-md);
    padding-bottom: var(--spacing-md);
}

.py-lg {
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
}

/* ============================================================================
   11. UTILITY CLASSES
   ============================================================================ */

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

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

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

.text-success {
    color: var(--color-success);
}

.text-error {
    color: var(--color-error);
}

.text-warning {
    color: var(--color-warning);
}

.text-info {
    color: var(--color-info);
}

.text-muted {
    color: var(--color-on-surface-variant);
}

.bg-primary {
    background-color: var(--color-primary-50);
}

.bg-secondary {
    background-color: #fff3e0;
}

.bg-success {
    background-color: #e8f5e9;
}

.bg-error {
    background-color: #ffebee;
}

.bg-warning {
    background-color: #fff3e0;
}

.bg-info {
    background-color: #e3f2fd;
}

.border {
    border: 1px solid var(--color-outline-variant);
}

.border-top {
    border-top: 1px solid var(--color-outline-variant);
}

.border-bottom {
    border-bottom: 1px solid var(--color-outline-variant);
}

.border-left {
    border-left: 1px solid var(--color-outline-variant);
}

.border-right {
    border-right: 1px solid var(--color-outline-variant);
}

.rounded {
    border-radius: var(--radius-md);
}

.rounded-sm {
    border-radius: var(--radius-sm);
}

.rounded-lg {
    border-radius: var(--radius-lg);
}

.rounded-full {
    border-radius: var(--radius-full);
}

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

.shadow-sm {
    box-shadow: var(--shadow-sm);
}

.shadow-lg {
    box-shadow: var(--shadow-lg);
}

.shadow-xl {
    box-shadow: var(--shadow-xl);
}

.shadow-2xl {
    box-shadow: var(--shadow-2xl);
}

.overflow-hidden {
    overflow: hidden;
}

.overflow-auto {
    overflow: auto;
}

.cursor-pointer {
    cursor: pointer;
}

.cursor-not-allowed {
    cursor: not-allowed;
}

.opacity-50 {
    opacity: 0.5;
}

.opacity-75 {
    opacity: 0.75;
}

.opacity-100 {
    opacity: 1;
}

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

.no-wrap {
    white-space: nowrap;
}

.word-break {
    word-break: break-word;
}

.font-light {
    font-weight: var(--font-weight-light);
}

.font-normal {
    font-weight: var(--font-weight-regular);
}

.font-medium {
    font-weight: var(--font-weight-medium);
}

.font-semibold {
    font-weight: var(--font-weight-semibold);
}

.font-bold {
    font-weight: var(--font-weight-bold);
}

/* ============================================================================
   12. MODALS & OVERLAYS
   ============================================================================ */

.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal-backdrop);
}

.modal {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    z-index: var(--z-modal);
    animation: modalSlide var(--transition-base) ease-out;
}

@keyframes modalSlide {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

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

.modal-header {
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--color-outline-variant);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
}

.modal-body {
    padding: var(--spacing-xl);
}

.modal-footer {
    padding: var(--spacing-xl);
    border-top: 1px solid var(--color-outline-variant);
    text-align: right;
}

.modal-footer button {
    margin-left: var(--spacing-md);
}

/* ============================================================================
   13. PAGINATION
   ============================================================================ */

.pagination {
    display: flex;
    list-style: none;
    gap: var(--spacing-sm);
    justify-content: center;
    margin: var(--spacing-xl) 0;
}

.pagination a,
.pagination button,
.pagination span {
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1px solid var(--color-outline-variant);
    border-radius: var(--radius-md);
    background-color: var(--color-surface);
    color: var(--color-primary);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: var(--font-weight-medium);
}

.pagination a:hover,
.pagination button:hover {
    background-color: var(--color-primary-50);
    border-color: var(--color-primary);
}

.pagination .active a,
.pagination .active span {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.pagination .disabled span {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================================================
   14. BADGES & TAGS
   ============================================================================ */

.badge,
.tag,
.label {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.badge-secondary {
    background-color: var(--color-secondary);
    color: white;
}

.badge-success {
    background-color: var(--color-success);
    color: white;
}

.badge-error,
.badge-danger {
    background-color: var(--color-error);
    color: white;
}

.badge-warning {
    background-color: var(--color-warning);
    color: #000;
}

.badge-info {
    background-color: var(--color-info);
    color: white;
}

.badge-outline {
    background-color: transparent;
    border: 1px solid var(--color-outline);
    color: var(--color-on-surface);
}

/* ============================================================================
   15. RESPONSIVE DESIGN
   ============================================================================ */

@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }

    .sidebar {
        width: 100%;
        position: fixed;
        left: 0;
        top: 60px;
        height: calc(100vh - 60px);
        transform: translateX(-100%);
        transition: transform var(--transition-base);
        z-index: var(--z-dropdown);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .layout-sidebar main {
        margin-left: 0;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .navbar {
        flex-direction: column;
        align-items: flex-start;
    }

    .navbar-nav {
        display: none;
    }

    .navbar-nav.open {
        display: flex;
        flex-direction: column;
        width: 100%;
    }

    table {
        font-size: var(--font-size-sm);
    }

    table th,
    table td {
        padding: var(--spacing-sm);
    }

    .modal {
        width: 95%;
        max-height: 95vh;
    }

    h1 {
        font-size: var(--font-size-2xl);
    }

    h2 {
        font-size: var(--font-size-xl);
    }

    h3 {
        font-size: var(--font-size-lg);
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-md: 0.75rem;
        --spacing-lg: 1.25rem;
        --spacing-xl: 1.5rem;
    }

    body {
        font-size: var(--font-size-sm);
    }

    .card,
    .panel,
    .box {
        padding: var(--spacing-lg);
    }

    button,
    [role="button"],
    .btn {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--font-size-sm);
    }

    .flex-column {
        flex-direction: column;
    }

    .form-inline {
        flex-direction: column;
    }

    .form-inline>* {
        flex: 1;
        width: 100%;
    }

    .modal {
        width: 100%;
        max-height: 100vh;
    }
}

/* Print Styles */
@media print {

    .navbar,
    .sidebar,
    .pagination,
    .btn,
    button {
        display: none;
    }

    body {
        background-color: white;
    }

    .card,
    .panel,
    .box {
        box-shadow: none;
        border: 1px solid #ccc;
    }
}