/**
 * Component Library - LimitedView Portal
 * All UI components (buttons, forms, cards, navigation, etc.)
 * British English Standards
 * Version: 1.0.0
 */

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-5);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-normal);
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 1px solid transparent;
    border-radius: var(--radius-2xl);
    transition: color var(--transition-fast),
                background-color var(--transition-fast),
                border-color var(--transition-fast),
                box-shadow var(--transition-fast),
                transform var(--transition-fast);
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--colour-primary-lighter);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Primary Button */
.btn-primary {
    color: var(--colour-text-inverse);
    background-color: var(--colour-primary);
    border-color: var(--colour-primary);
}

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

.btn-primary:active {
    background-color: var(--colour-primary-darker);
    border-color: var(--colour-primary-darker);
    transform: translateY(1px);
}

/* Secondary Button */
.btn-secondary {
    color: var(--colour-text-inverse);
    background-color: var(--colour-secondary);
    border-color: var(--colour-secondary);
}

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

.btn-secondary:active {
    background-color: var(--colour-secondary-darker);
    border-color: var(--colour-secondary-darker);
    transform: translateY(1px);
}

/* Success Button */
.btn-success {
    color: var(--colour-text-inverse);
    background-color: var(--colour-success);
    border-color: var(--colour-success);
}

.btn-success:hover {
    background-color: var(--colour-success-dark);
    border-color: var(--colour-success-dark);
}

/* Danger Button */
.btn-danger {
    color: var(--colour-text-inverse);
    background-color: var(--colour-error);
    border-color: var(--colour-error);
}

.btn-danger:hover {
    background-color: var(--colour-error-dark);
    border-color: var(--colour-error-dark);
}

/* Outline Variants */
.btn-outline {
    color: var(--colour-primary);
    background-color: transparent;
    border-color: var(--colour-border-dark);
}

.btn-outline:hover {
    color: var(--colour-text-inverse);
    background-color: var(--colour-primary);
    border-color: var(--colour-primary);
}

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

.btn-outline-secondary:hover {
    color: var(--colour-text-inverse);
    background-color: var(--colour-secondary);
}

/* Link Button */
.btn-link {
    color: var(--colour-primary);
    background-color: transparent;
    border-color: transparent;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.btn-link:hover {
    color: var(--colour-primary-dark);
    background-color: transparent;
    border-color: transparent;
}

/* Button Sizes */
.btn-sm {
    padding: var(--spacing-2) var(--spacing-3);
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: var(--spacing-4) var(--spacing-6);
    font-size: var(--font-size-lg);
}

/* Button Block (Full Width) */
.btn-block {
    display: flex;
    width: 100%;
}

/* ============================================
   FORMS
   ============================================ */

.form-group {
    margin-bottom: var(--spacing-5);
}

.form-label {
    display: block;
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-2);
    color: var(--colour-text-primary);
}

.form-label-required::after {
    content: " *";
    color: var(--colour-error);
}

.form-control {
    display: block;
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--colour-text-primary);
    background-color: var(--colour-bg-primary);
    border: 1px solid var(--colour-border-dark);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--colour-primary);
    box-shadow: 0 0 0 3px var(--colour-primary-lighter);
}

.form-control:disabled {
    background-color: var(--colour-bg-tertiary);
    color: var(--colour-text-disabled);
    cursor: not-allowed;
}

.form-control.is-invalid {
    border-color: var(--colour-error);
}

.form-control.is-invalid:focus {
    border-color: var(--colour-error);
    box-shadow: 0 0 0 3px var(--colour-error-lighter);
}

.form-control.is-valid {
    border-color: var(--colour-success);
}

.form-control.is-valid:focus {
    border-color: var(--colour-success);
    box-shadow: 0 0 0 3px var(--colour-success-lighter);
}

/* Select */
.form-select {
    display: block;
    width: 100%;
    padding: var(--spacing-3) var(--spacing-10) var(--spacing-3) var(--spacing-4);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--colour-text-primary);
    background-color: var(--colour-bg-primary);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3E%3C/svg%3E");
    background-position: right var(--spacing-3) center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    border: 1px solid var(--colour-border-dark);
    border-radius: var(--radius-md);
    appearance: none;
    cursor: pointer;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-select:focus {
    outline: none;
    border-color: var(--colour-primary);
    box-shadow: 0 0 0 3px var(--colour-primary-lighter);
}

/* Checkboxes & Radio Buttons */
.form-check {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-3);
}

.form-check-input {
    width: var(--size-4);
    height: var(--size-4);
    margin-right: var(--spacing-2);
    cursor: pointer;
    accent-color: var(--colour-primary);
}

.form-check-label {
    font-weight: var(--font-weight-normal);
    cursor: pointer;
    user-select: none;
}

/* Form Feedback */
.form-help {
    display: block;
    margin-top: var(--spacing-2);
    font-size: var(--font-size-sm);
    color: var(--colour-text-secondary);
}

.form-error {
    display: block;
    margin-top: var(--spacing-2);
    font-size: var(--font-size-sm);
    color: var(--colour-error);
}

.form-success {
    display: block;
    margin-top: var(--spacing-2);
    font-size: var(--font-size-sm);
    color: var(--colour-success);
}

/* Input Groups */
.input-group {
    display: flex;
    align-items: stretch;
    width: 100%;
}

.input-group .form-control {
    flex: 1 1 auto;
    width: 1%;
    min-width: 0;
}

.input-group .form-control:not(:last-child) {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.input-group .form-control:not(:first-child) {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

.input-group-text {
    display: flex;
    align-items: center;
    padding: var(--spacing-3) var(--spacing-4);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--colour-text-secondary);
    background-color: var(--colour-bg-secondary);
    border: 1px solid var(--colour-border-dark);
    white-space: nowrap;
}

.input-group-text:first-child {
    border-top-left-radius: var(--radius-md);
    border-bottom-left-radius: var(--radius-md);
    border-right: 0;
}

.input-group-text:last-child {
    border-top-right-radius: var(--radius-md);
    border-bottom-right-radius: var(--radius-md);
    border-left: 0;
}

/* ============================================
   CARDS
   ============================================ */

.card {
    display: flex;
    flex-direction: column;
    background-color: var(--colour-bg-primary);
    border: 1px solid var(--colour-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.card-header {
    padding: var(--spacing-4) var(--spacing-5);
    background-color: var(--colour-bg-secondary);
    border-bottom: 1px solid var(--colour-border);
    font-weight: var(--font-weight-semibold);
}

.card-body {
    flex: 1 1 auto;
    padding: var(--spacing-5);
}

.card-footer {
    padding: var(--spacing-4) var(--spacing-5);
    background-color: var(--colour-bg-secondary);
    border-top: 1px solid var(--colour-border);
}

.card-title {
    margin-bottom: var(--spacing-3);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
}

.card-text {
    margin-bottom: var(--spacing-4);
}

.card-text:last-child {
    margin-bottom: 0;
}

/* Card Hover Effect */
.card-hover {
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

/* ============================================
   NAVIGATION - NAVBAR
   ============================================ */

.navbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-8) var(--spacing-12);
    background-color: var(--colour-bg-primary);
    border-bottom: none;
    max-width: 1400px;
    margin: 0 auto;
}

.navbar-brand {
    display: flex;
    align-items: center;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--colour-text-primary);
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.navbar-brand:hover {
    opacity: 0.7;
}

.navbar-nav {
    display: flex;
    flex-direction: row;
    gap: var(--spacing-2);
    list-style: none;
    margin: 0;
    padding: 0;
}

.navbar-item {
    display: flex;
    align-items: center;
}

.navbar-link {
    display: block;
    padding: var(--spacing-2) var(--spacing-3);
    color: var(--colour-text-primary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-normal);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: opacity var(--transition-fast);
}

.navbar-link:hover {
    opacity: 0.6;
}

.navbar-link.active {
    opacity: 1;
    font-weight: var(--font-weight-semibold);
}

/* Mobile Menu Toggle */
.navbar-toggle {
    display: none;
    padding: var(--spacing-2);
    background: none;
    border: 1px solid var(--colour-border-dark);
    border-radius: var(--radius-md);
    cursor: pointer;
}

@media (max-width: 767px) {
    .navbar-toggle {
        display: block;
    }

    .navbar-nav {
        display: none;
        width: 100%;
        flex-direction: column;
        margin-top: var(--spacing-4);
    }

    .navbar-nav.show {
        display: flex;
    }

    .navbar-link {
        width: 100%;
    }
}

/* ============================================
   NAVIGATION - SIDEBAR
   ============================================ */

.sidebar {
    display: flex;
    flex-direction: column;
    width: 280px;
    height: 100vh;
    background-color: var(--colour-bg-primary);
    border-right: 1px solid var(--colour-border);
    overflow-y: auto;
}

.sidebar-header {
    padding: var(--spacing-5) var(--spacing-4);
    border-bottom: 1px solid var(--colour-border);
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-4);
}

.sidebar-item {
    margin-bottom: var(--spacing-1);
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3) var(--spacing-4);
    color: var(--colour-text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.sidebar-link:hover {
    color: var(--colour-primary);
    background-color: var(--colour-bg-secondary);
}

.sidebar-link.active {
    color: var(--colour-primary);
    background-color: var(--colour-primary-lighter);
    font-weight: var(--font-weight-medium);
}

.sidebar-footer {
    padding: var(--spacing-4);
    border-top: 1px solid var(--colour-border);
}

/* ============================================
   BREADCRUMB
   ============================================ */

.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) 0;
    list-style: none;
    margin: 0;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-sm);
}

.breadcrumb-item:not(:last-child)::after {
    content: "/";
    color: var(--colour-text-tertiary);
}

.breadcrumb-item a {
    color: var(--colour-text-secondary);
    text-decoration: none;
}

.breadcrumb-item a:hover {
    color: var(--colour-primary);
    text-decoration: underline;
}

.breadcrumb-item.active {
    color: var(--colour-text-primary);
    font-weight: var(--font-weight-medium);
}

/* ============================================
   TABLES
   ============================================ */

.table {
    width: 100%;
    margin-bottom: var(--spacing-4);
    color: var(--colour-text-primary);
    border-collapse: collapse;
}

.table th,
.table td {
    padding: var(--spacing-3) var(--spacing-4);
    text-align: left;
    vertical-align: top;
    border-bottom: 1px solid var(--colour-border);
}

.table thead th {
    font-weight: var(--font-weight-semibold);
    background-color: var(--colour-bg-secondary);
    border-bottom-width: 2px;
    border-bottom-color: var(--colour-border-dark);
}

.table tbody tr:last-child td {
    border-bottom: 0;
}

/* Table Striped */
.table-striped tbody tr:nth-of-type(odd) {
    background-color: var(--colour-bg-secondary);
}

/* Table Hover */
.table-hover tbody tr {
    transition: background-color var(--transition-fast);
}

.table-hover tbody tr:hover {
    background-color: var(--colour-bg-tertiary);
}

/* Table Bordered */
.table-bordered {
    border: 1px solid var(--colour-border);
}

.table-bordered th,
.table-bordered td {
    border: 1px solid var(--colour-border);
}

/* Table Responsive */
.table-responsive {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* ============================================
   ALERTS / MESSAGES
   ============================================ */

.alert {
    position: relative;
    padding: var(--spacing-4) var(--spacing-5);
    margin-bottom: var(--spacing-4);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
}

.alert-dismissible {
    padding-right: var(--spacing-12);
}

.alert-close {
    position: absolute;
    top: var(--spacing-4);
    right: var(--spacing-5);
    padding: 0;
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    line-height: 1;
    color: inherit;
    opacity: 0.5;
    cursor: pointer;
    transition: opacity var(--transition-fast);
}

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

.alert-success {
    color: var(--colour-success-dark);
    background-color: var(--colour-success-lighter);
    border-color: var(--colour-success-light);
}

.alert-warning {
    color: var(--colour-warning-dark);
    background-color: var(--colour-warning-lighter);
    border-color: var(--colour-warning-light);
}

.alert-error {
    color: var(--colour-error-dark);
    background-color: var(--colour-error-lighter);
    border-color: var(--colour-error-light);
}

.alert-info {
    color: var(--colour-info-dark);
    background-color: var(--colour-info-lighter);
    border-color: var(--colour-info-light);
}

.alert-heading {
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-2);
}

/* ============================================
   MODALS
   ============================================ */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-modal);
    overflow-x: hidden;
    overflow-y: auto;
}

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

.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: var(--z-modal-backdrop);
    backdrop-filter: blur(2px);
}

.modal-dialog {
    position: relative;
    width: auto;
    max-width: 600px;
    margin: var(--spacing-4);
    pointer-events: auto;
    z-index: var(--z-modal);
}

.modal-content {
    position: relative;
    display: flex;
    flex-direction: column;
    width: 100%;
    background-color: var(--colour-bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2xl);
    outline: 0;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-5);
    border-bottom: 1px solid var(--colour-border);
    border-top-left-radius: var(--radius-lg);
    border-top-right-radius: var(--radius-lg);
}

.modal-title {
    margin-bottom: 0;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
}

.modal-close {
    padding: 0;
    background: none;
    border: none;
    font-size: var(--font-size-2xl);
    line-height: 1;
    color: var(--colour-text-secondary);
    opacity: 0.5;
    cursor: pointer;
    transition: opacity var(--transition-fast);
}

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

.modal-body {
    position: relative;
    flex: 1 1 auto;
    padding: var(--spacing-5);
}

.modal-footer {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-3);
    padding: var(--spacing-5);
    border-top: 1px solid var(--colour-border);
    border-bottom-left-radius: var(--radius-lg);
    border-bottom-right-radius: var(--radius-lg);
}

/* ============================================
   LOADING STATES
   ============================================ */

/* Spinner */
.spinner {
    display: inline-block;
    width: var(--size-8);
    height: var(--size-8);
    border: 3px solid var(--colour-border);
    border-top-color: var(--colour-primary);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

.spinner-sm {
    width: var(--size-4);
    height: var(--size-4);
    border-width: 2px;
}

.spinner-lg {
    width: var(--size-12);
    height: var(--size-12);
    border-width: 4px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Skeleton Loader */
.skeleton {
    display: block;
    background: linear-gradient(
        90deg,
        var(--colour-bg-tertiary) 25%,
        var(--colour-bg-quaternary) 50%,
        var(--colour-bg-tertiary) 75%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}

.skeleton-text {
    height: var(--spacing-4);
    margin-bottom: var(--spacing-2);
}

.skeleton-heading {
    height: var(--spacing-6);
    margin-bottom: var(--spacing-4);
}

.skeleton-avatar {
    width: var(--size-12);
    height: var(--size-12);
    border-radius: var(--radius-full);
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* Progress Bar */
.progress {
    display: flex;
    height: var(--spacing-4);
    overflow: hidden;
    background-color: var(--colour-bg-tertiary);
    border-radius: var(--radius-md);
}

.progress-bar {
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
    color: var(--colour-text-inverse);
    text-align: center;
    white-space: nowrap;
    background-color: var(--colour-primary);
    transition: width var(--transition-slow);
}

.progress-bar-striped {
    background-image: linear-gradient(
        45deg,
        rgba(255, 255, 255, 0.15) 25%,
        transparent 25%,
        transparent 50%,
        rgba(255, 255, 255, 0.15) 50%,
        rgba(255, 255, 255, 0.15) 75%,
        transparent 75%,
        transparent
    );
    background-size: var(--spacing-4) var(--spacing-4);
}

.progress-bar-animated {
    animation: progress-bar-stripes 1s linear infinite;
}

@keyframes progress-bar-stripes {
    0% {
        background-position: var(--spacing-4) 0;
    }
    100% {
        background-position: 0 0;
    }
}

/* ============================================
   BADGES
   ============================================ */

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-1) var(--spacing-3);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: var(--radius-full);
}

.badge-primary {
    color: var(--colour-text-inverse);
    background-color: var(--colour-primary);
}

.badge-secondary {
    color: var(--colour-text-inverse);
    background-color: var(--colour-secondary);
}

.badge-success {
    color: var(--colour-text-inverse);
    background-color: var(--colour-success);
}

.badge-warning {
    color: var(--colour-text-inverse);
    background-color: var(--colour-warning);
}

.badge-error {
    color: var(--colour-text-inverse);
    background-color: var(--colour-error);
}

.badge-info {
    color: var(--colour-text-inverse);
    background-color: var(--colour-info);
}

/* ============================================
   PAGINATION
   ============================================ */

.pagination {
    display: flex;
    gap: var(--spacing-2);
    list-style: none;
    margin: 0;
    padding: 0;
}

.pagination-item {
    display: flex;
}

.pagination-link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: var(--size-10);
    padding: var(--spacing-2) var(--spacing-3);
    color: var(--colour-text-secondary);
    text-decoration: none;
    background-color: var(--colour-bg-primary);
    border: 1px solid var(--colour-border-dark);
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
}

.pagination-link:hover {
    color: var(--colour-primary);
    background-color: var(--colour-bg-secondary);
    border-color: var(--colour-primary);
}

.pagination-link.active {
    color: var(--colour-text-inverse);
    background-color: var(--colour-primary);
    border-color: var(--colour-primary);
}

.pagination-link.disabled {
    color: var(--colour-text-disabled);
    background-color: var(--colour-bg-tertiary);
    border-color: var(--colour-border);
    cursor: not-allowed;
    pointer-events: none;
}