/* =================================
   COMPONENT CSS LIBRARY
   World-Class UI Components
   ================================= */

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-tight);
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    vertical-align: middle;
    position: relative;
    overflow: hidden;
}

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

.btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Button Variants */
.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
}

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

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

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

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

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

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

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

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

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

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

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

.btn-ghost:hover {
    background-color: var(--color-gray-100);
}

/* Button Sizes */
.btn-xs {
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
}

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-lg);
}

.btn-xl {
    padding: var(--space-5) var(--space-10);
    font-size: var(--font-size-xl);
}

.btn-full {
    width: 100%;
}

/* Button with Icon */
.btn-icon {
    padding: var(--space-3);
    aspect-ratio: 1;
}

.btn .icon {
    margin-right: var(--space-2);
}

.btn .icon:last-child {
    margin-right: 0;
    margin-left: var(--space-2);
}

.btn-icon .icon {
    margin: 0;
}

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

.card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all var(--transition-base);
}

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

.card-header {
    padding: var(--space-6);
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-gray-50);
}

.card-body {
    padding: var(--space-6);
}

.card-footer {
    padding: var(--space-6);
    border-top: 1px solid var(--color-border);
    background-color: var(--color-gray-50);
}

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.card-title {
    margin: 0 0 var(--space-2) 0;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
}

.card-subtitle {
    margin: 0 0 var(--space-4) 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.card-text {
    margin: 0;
    color: var(--color-text);
    line-height: var(--line-height-relaxed);
}

/* Card Variants */
.card-elevated {
    box-shadow: var(--shadow-lg);
}

.card-flat {
    box-shadow: none;
    border: 2px solid var(--color-border);
}

.card-outlined {
    box-shadow: none;
    border: 2px solid var(--color-primary);
}

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

.form-group {
    margin-bottom: var(--space-6);
}

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

.form-control {
    display: block;
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 90, 156, 0.1);
}

.form-control:disabled {
    background-color: var(--color-gray-100);
    opacity: 0.6;
    cursor: not-allowed;
}

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

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

.form-text {
    margin-top: var(--space-1);
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.form-error {
    margin-top: var(--space-1);
    font-size: var(--font-size-sm);
    color: var(--color-error);
}

.form-success {
    margin-top: var(--space-1);
    font-size: var(--font-size-sm);
    color: var(--color-success);
}

/* Form Sizes */
.form-control-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
}

.form-control-lg {
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-lg);
}

/* Checkbox & Radio */
.form-check {
    display: flex;
    align-items: flex-start;
    margin-bottom: var(--space-3);
}

.form-check-input {
    width: 1.25rem;
    height: 1.25rem;
    margin-right: var(--space-3);
    cursor: pointer;
}

.form-check-label {
    margin-bottom: 0;
    cursor: pointer;
    line-height: var(--line-height-relaxed);
}

/* ===== NAVIGATION ===== */

.nav {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-item {
    display: flex;
}

.nav-link {
    display: block;
    padding: var(--space-3) var(--space-4);
    color: var(--color-text);
    text-decoration: none;
    transition: all var(--transition-fast);
    border-radius: var(--radius-md);
}

.nav-link:hover {
    color: var(--color-primary);
    background-color: var(--color-gray-100);
}

.nav-link.active {
    color: var(--color-primary);
    background-color: var(--color-primary);
    background-color: rgba(0, 90, 156, 0.1);
}

/* Nav Variants */
.nav-pills .nav-link {
    border-radius: var(--radius-full);
}

.nav-tabs {
    border-bottom: 1px solid var(--color-border);
}

.nav-tabs .nav-link {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    border: 1px solid transparent;
    margin-bottom: -1px;
}

.nav-tabs .nav-link.active {
    background-color: var(--color-white);
    border-color: var(--color-border) var(--color-border) var(--color-white);
}

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

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

.alert-primary {
    color: var(--color-primary-dark);
    background-color: rgba(0, 90, 156, 0.1);
    border-color: rgba(0, 90, 156, 0.2);
}

.alert-success {
    color: #0f5132;
    background-color: rgba(76, 175, 80, 0.1);
    border-color: rgba(76, 175, 80, 0.2);
}

.alert-warning {
    color: #664d03;
    background-color: rgba(255, 152, 0, 0.1);
    border-color: rgba(255, 152, 0, 0.2);
}

.alert-error {
    color: #842029;
    background-color: rgba(244, 67, 54, 0.1);
    border-color: rgba(244, 67, 54, 0.2);
}

.alert-info {
    color: #055160;
    background-color: rgba(33, 150, 243, 0.1);
    border-color: rgba(33, 150, 243, 0.2);
}

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

.alert-close {
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    background: none;
    border: none;
    font-size: var(--font-size-lg);
    cursor: pointer;
    color: inherit;
    opacity: 0.7;
}

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

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

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: var(--radius-full);
}

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

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

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

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

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

.badge-light {
    color: var(--color-text);
    background-color: var(--color-gray-200);
}

.badge-dark {
    color: var(--color-white);
    background-color: var(--color-gray-800);
}

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

.modal {
    position: fixed;
    top: 0;
    left: 0;
    z-index: var(--z-modal);
    width: 100%;
    height: 100%;
    display: none;
    align-items: center;
    justify-content: center;
    background-color: rgba(0, 0, 0, 0.5);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}

.modal.show {
    display: flex;
}

.modal-dialog {
    position: relative;
    width: auto;
    max-width: 500px;
    margin: var(--space-4);
    pointer-events: auto;
}

.modal-content {
    position: relative;
    display: flex;
    flex-direction: column;
    width: 100%;
    background-color: var(--color-white);
    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(--space-6);
    border-bottom: 1px solid var(--color-border);
}

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

.modal-close {
    background: none;
    border: none;
    font-size: var(--font-size-2xl);
    cursor: pointer;
    padding: 0;
    color: var(--color-text-light);
}

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

.modal-body {
    position: relative;
    flex: 1 1 auto;
    padding: var(--space-6);
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-3);
    padding: var(--space-6);
    border-top: 1px solid var(--color-border);
}

/* ===== TOOLTIPS ===== */

.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip::before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-bottom: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background-color: var(--color-gray-900);
    color: var(--color-white);
    font-size: var(--font-size-sm);
    white-space: nowrap;
    border-radius: var(--radius-md);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    z-index: var(--z-tooltip);
}

.tooltip::after {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid var(--color-gray-900);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
}

.tooltip:hover::before,
.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
}

/* ===== DROPDOWNS ===== */

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-toggle {
    cursor: pointer;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: var(--z-dropdown);
    min-width: 160px;
    padding: var(--space-2) 0;
    margin: var(--space-1) 0 0;
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
}

.dropdown.show .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    width: 100%;
    padding: var(--space-2) var(--space-4);
    color: var(--color-text);
    text-decoration: none;
    background-color: transparent;
    border: 0;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.dropdown-item:hover {
    background-color: var(--color-gray-100);
    color: var(--color-primary);
}

.dropdown-divider {
    height: 0;
    margin: var(--space-2) 0;
    border-top: 1px solid var(--color-border);
}

/* ===== PROGRESS BARS ===== */

.progress {
    display: flex;
    height: 8px;
    overflow: hidden;
    background-color: var(--color-gray-200);
    border-radius: var(--radius-full);
}

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

.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: 1rem 1rem;
}

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

@keyframes progress-bar-stripes {
    0% { background-position-x: 1rem; }
}

/* ===== SPINNERS ===== */

.spinner {
    display: inline-block;
    width: 2rem;
    height: 2rem;
    vertical-align: -0.125em;
    border: 0.25em solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.75s linear infinite;
}

.spinner-sm {
    width: 1rem;
    height: 1rem;
    border-width: 0.125em;
}

.spinner-lg {
    width: 3rem;
    height: 3rem;
    border-width: 0.375em;
}

/* ===== TABS ===== */

.tab-content {
    margin-top: var(--space-4);
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* ===== ACCORDIONS ===== */

.accordion {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.accordion-item {
    border-bottom: 1px solid var(--color-border);
}

.accordion-item:last-child {
    border-bottom: none;
}

.accordion-header {
    margin: 0;
}

.accordion-button {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    background-color: var(--color-white);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.accordion-button:hover {
    background-color: var(--color-gray-50);
}

.accordion-button::after {
    content: '+';
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    transition: transform var(--transition-fast);
}

.accordion-button[aria-expanded="true"]::after {
    content: '−';
    transform: rotate(180deg);
}

.accordion-collapse {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.accordion-collapse.show {
    max-height: 1000px;
}

.accordion-body {
    padding: var(--space-6);
    background-color: var(--color-gray-50);
}

/* ===== BREADCRUMBS ===== */

.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    padding: 0;
    margin: 0;
    list-style: none;
}

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

.breadcrumb-item + .breadcrumb-item {
    padding-left: var(--space-2);
}

.breadcrumb-item + .breadcrumb-item::before {
    content: '/';
    padding-right: var(--space-2);
    color: var(--color-text-light);
}

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

.breadcrumb-item a:hover {
    text-decoration: underline;
}

.breadcrumb-item.active {
    color: var(--color-text-light);
}

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

.pagination {
    display: flex;
    padding-left: 0;
    list-style: none;
    border-radius: var(--radius-md);
}

.page-item {
    display: flex;
}

.page-link {
    position: relative;
    display: block;
    padding: var(--space-2) var(--space-3);
    color: var(--color-primary);
    text-decoration: none;
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

.page-link:hover {
    color: var(--color-primary-dark);
    background-color: var(--color-gray-100);
    border-color: var(--color-border);
}

.page-item:first-child .page-link {
    border-top-left-radius: var(--radius-md);
    border-bottom-left-radius: var(--radius-md);
}

.page-item:last-child .page-link {
    border-top-right-radius: var(--radius-md);
    border-bottom-right-radius: var(--radius-md);
}

.page-item.active .page-link {
    z-index: 3;
    color: var(--color-white);
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.page-item.disabled .page-link {
    color: var(--color-text-light);
    pointer-events: none;
    background-color: var(--color-white);
    border-color: var(--color-border);
}

/* ===== RESPONSIVE HELPERS ===== */

@media (max-width: 767px) {
    .modal-dialog {
        max-width: none;
        margin: var(--space-2);
    }
    
    .dropdown-menu {
        position: fixed;
        top: auto !important;
        left: var(--space-4) !important;
        right: var(--space-4) !important;
        width: auto;
    }
    
    .nav {
        flex-direction: column;
    }
    
    .btn-full-mobile {
        width: 100%;
    }
}