/* ============================================
   Biz-Retriever Component Library v2.0
   Production-grade UI Components
   ============================================ */

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes slideInDown {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes modalSlideIn {
    from { opacity: 0; transform: translateY(-16px) scale(0.98); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

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

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

@keyframes progress {
    0%   { transform: scaleX(0); transform-origin: left; }
    50%  { transform: scaleX(1); transform-origin: left; }
    51%  { transform: scaleX(1); transform-origin: right; }
    100% { transform: scaleX(0); transform-origin: right; }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50%      { opacity: 0.6; }
}

@keyframes ripple {
    to { transform: scale(2.5); opacity: 0; }
}

/* ============================================
   BUTTONS — Detailed state machine
   States: default → hover → focus → active → disabled → loading
   ============================================ */
.btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    height: var(--btn-height-md);
    padding: 0 var(--spacing-5);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    line-height: 1;
    border-radius: var(--radius-lg);
    border: 1px solid transparent;
    white-space: nowrap;
    user-select: none;
    cursor: pointer;
    transition:
        background-color var(--duration-150) var(--ease-in-out),
        border-color var(--duration-150) var(--ease-in-out),
        color var(--duration-150) var(--ease-in-out),
        box-shadow var(--duration-150) var(--ease-in-out),
        transform var(--duration-100) var(--ease-out);
    -webkit-font-smoothing: antialiased;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0) scale(0.98);
    transition-duration: var(--duration-75);
}

.btn:focus-visible {
    box-shadow: var(--focus-ring-offset);
}

.btn:disabled,
.btn[aria-disabled="true"] {
    opacity: 0.45;
    cursor: not-allowed;
    pointer-events: none;
    transform: none;
}

/* Primary — Solid fill */
.btn-primary {
    background: var(--primary);
    color: var(--text-on-primary);
    box-shadow: var(--shadow-xs), inset 0 1px 0 rgba(255,255,255,0.1);
}

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: var(--shadow-primary-sm), inset 0 1px 0 rgba(255,255,255,0.1);
}

.btn-primary:active {
    background: var(--primary-active);
    box-shadow: var(--shadow-xs);
}

/* Secondary — Ghost with border */
.btn-secondary {
    background: var(--bg-primary);
    color: var(--text-primary);
    border-color: var(--border-color);
    box-shadow: var(--shadow-xs);
}

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--border-color-strong);
    box-shadow: var(--shadow-sm);
}

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

/* Tertiary — Subtle background */
.btn-tertiary {
    background: transparent;
    color: var(--text-secondary);
}

.btn-tertiary:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.btn-tertiary:active {
    background: var(--bg-active);
}

/* Outline — Primary colored border */
.btn-outline {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary-light);
    box-shadow: var(--shadow-primary-sm);
}

.btn-outline:active {
    background: var(--primary-subtle);
}

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

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

/* Size Variants */
.btn-sm {
    height: var(--btn-height-sm);
    padding: 0 var(--spacing-3);
    font-size: var(--font-size-xs);
    border-radius: var(--radius-md);
}

.btn-lg {
    height: var(--btn-height-lg);
    padding: 0 var(--spacing-8);
    font-size: var(--font-size-base);
}

.btn-block {
    width: 100%;
}

/* Button Loading State */
.btn.loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.6s linear infinite;
}

.btn-secondary.loading::after,
.btn-outline.loading::after {
    border-color: rgba(0,0,0,0.15);
    border-top-color: var(--primary);
}

/* ============================================
   FORM ELEMENTS
   ============================================ */
.form-group {
    margin-bottom: var(--spacing-5);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-1-5);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    line-height: var(--line-height-normal);
}

.form-group input,
.form-group textarea,
.form-group select,
.form-control {
    width: 100%;
    height: var(--input-height-md);
    padding: 0 var(--spacing-3-5);
    border: 1.5px solid var(--input-border);
    border-radius: var(--radius-lg);
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    transition:
        border-color var(--duration-150) var(--ease-in-out),
        box-shadow var(--duration-150) var(--ease-in-out),
        background-color var(--duration-150) var(--ease-in-out);
}

.form-group textarea {
    height: auto;
    min-height: 100px;
    padding: var(--spacing-3) var(--spacing-3-5);
    resize: vertical;
    line-height: var(--line-height-relaxed);
}

.form-group input:hover,
.form-group textarea:hover,
.form-group select:hover,
.form-control:hover {
    border-color: var(--border-color-strong);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus,
.form-control:focus {
    outline: none;
    border-color: var(--input-border-focus);
    box-shadow: var(--focus-ring);
    background: var(--bg-primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-disabled);
}

/* Validation states */
.form-group input.error,
.form-group input[aria-invalid="true"] {
    border-color: var(--danger);
}

.form-group input.error:focus,
.form-group input[aria-invalid="true"]:focus {
    box-shadow: var(--focus-ring-error);
}

.form-group input.valid {
    border-color: var(--success);
}

/* Password Input */
.password-input {
    position: relative;
}

.password-input input {
    padding-right: 3rem;
}

.toggle-password {
    position: absolute;
    right: var(--spacing-3);
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    opacity: 0.5;
    transition: opacity var(--transition-fast), background var(--transition-fast);
}

.toggle-password:hover {
    opacity: 1;
    background: var(--bg-hover);
}

/* Hint Text */
.hint,
.form-info {
    display: block;
    margin-top: var(--spacing-1-5);
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    line-height: var(--line-height-normal);
}

/* ============================================
   CARD — Elevated surface
   ============================================ */
.card {
    background: var(--card-bg);
    border-radius: var(--card-radius);
    border: var(--card-border);
    box-shadow: var(--card-shadow);
    padding: var(--card-padding);
    transition:
        box-shadow var(--duration-200) var(--ease-in-out),
        border-color var(--duration-200) var(--ease-in-out),
        transform var(--duration-200) var(--ease-in-out);
}

.card:hover {
    box-shadow: var(--card-shadow-hover);
    border-color: var(--border-color-strong);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-5);
    padding-bottom: var(--spacing-4);
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    line-height: var(--line-height-tight);
}

/* ============================================
   MODAL — Focus-trap ready
   ============================================ */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
}

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

.modal-backdrop {
    position: fixed;
    inset: 0;
    background: var(--bg-overlay);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    z-index: var(--z-modal-backdrop);
    animation: fadeIn var(--duration-200) var(--ease-out);
}

.modal-content {
    position: relative;
    background: var(--card-bg);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-2xl);
    max-width: 500px;
    width: calc(100% - var(--spacing-8));
    max-height: 90vh;
    overflow-y: auto;
    z-index: var(--z-modal);
    animation: modalSlideIn var(--duration-300) var(--ease-spring);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-5) var(--spacing-6);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2,
.modal-header h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

.modal-close,
.close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-lg);
    font-size: 1.25rem;
    color: var(--text-tertiary);
    transition: all var(--transition-fast);
}

.modal-close:hover,
.close-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-6);
}

.modal-footer {
    padding: var(--spacing-4) var(--spacing-6);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-3);
}

/* ============================================
   TOAST — Notification
   ============================================ */
.toast {
    position: fixed;
    bottom: var(--spacing-6);
    right: var(--spacing-6);
    background: var(--card-bg);
    color: var(--text-primary);
    padding: var(--spacing-4) var(--spacing-5);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary);
    z-index: var(--z-notification);
    max-width: 380px;
    transform: translateY(calc(100% + var(--spacing-8)));
    opacity: 0;
    transition:
        transform var(--duration-300) var(--ease-spring),
        opacity var(--duration-200) var(--ease-out);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-normal);
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast.success { border-left-color: var(--success); }
.toast.error   { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }
.toast.info    { border-left-color: var(--info); }

/* ============================================
   BADGE — Status indicators
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-1);
    padding: var(--spacing-0-5) var(--spacing-2-5);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-normal);
    border-radius: var(--radius-full);
    background: var(--slate-100);
    color: var(--slate-700);
    white-space: nowrap;
}

.badge.success {
    background: var(--success-light);
    color: var(--emerald-700);
}

.badge.warning {
    background: var(--warning-light);
    color: var(--amber-800);
}

.badge.danger {
    background: var(--danger-light);
    color: var(--red-700);
}

.badge.info {
    background: var(--info-light);
    color: var(--blue-700);
}

.badge.primary {
    background: var(--primary-light);
    color: var(--blue-700);
}

/* ============================================
   DIVIDER
   ============================================ */
.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: var(--spacing-6) 0;
    color: var(--text-tertiary);
    font-size: var(--font-size-sm);
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-color);
}

.divider span {
    padding: 0 var(--spacing-4);
}

/* ============================================
   SPINNER — Loading indicators
   ============================================ */
.spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid rgba(255,255,255,0.25);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.6s linear infinite;
}

.spinner-lg {
    width: 2rem;
    height: 2rem;
    border-width: 2.5px;
}

.spinner-primary {
    border-color: var(--primary-subtle);
    border-top-color: var(--primary);
}

/* ============================================
   SKELETON — Content placeholder
   ============================================ */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--slate-100) 0%,
        var(--slate-200) 40%,
        var(--slate-100) 80%
    );
    background-size: 200% 100%;
    animation: skeletonLoading 1.8s ease-in-out infinite;
    border-radius: var(--radius-md);
}

body.dark-mode .skeleton {
    background: linear-gradient(
        90deg,
        rgba(148, 163, 184, 0.06) 0%,
        rgba(148, 163, 184, 0.12) 40%,
        rgba(148, 163, 184, 0.06) 80%
    );
    background-size: 200% 100%;
}

.skeleton-text {
    height: 0.875rem;
    margin-bottom: var(--spacing-2);
}

.skeleton-title {
    height: 1.25rem;
    width: 60%;
    margin-bottom: var(--spacing-3);
}

.skeleton-card {
    height: 180px;
    width: 100%;
}

.skeleton-circle {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: var(--radius-full);
}

/* ============================================
   PROGRESS BAR
   ============================================ */
.progress-bar-container {
    width: 100%;
    height: 4px;
    background: var(--slate-200);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--blue-400));
    animation: progress 1.8s var(--ease-in-out) infinite;
    border-radius: var(--radius-full);
}

/* ============================================
   PASSWORD STRENGTH
   ============================================ */
.password-strength {
    margin-top: var(--spacing-2);
}

.strength-bar {
    width: 100%;
    height: 3px;
    background: var(--slate-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-1);
}

.strength-fill {
    height: 100%;
    width: 0%;
    border-radius: var(--radius-full);
    transition: all var(--duration-300) var(--ease-out);
}

.strength-text {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-base);
}

/* ============================================
   EMPTY STATE
   ============================================ */
.empty-state {
    text-align: center;
    padding: var(--spacing-12) var(--spacing-6);
    color: var(--text-tertiary);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-4);
    opacity: 0.6;
}

/* ============================================
   TABLE
   ============================================ */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead {
    background: var(--bg-secondary);
}

th {
    padding: var(--spacing-3) var(--spacing-4);
    text-align: left;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wider);
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: var(--spacing-3-5) var(--spacing-4);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color-subtle);
}

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

tbody tr:hover {
    background: var(--bg-hover);
}

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