/**
 * Component Library - StratIntel Design System
 * Version: 1.0.0
 * Created: 2025-12-07
 * Purpose: FAS 6 Phase 0 Week 2 - Reusable UI components
 *
 * Dependencies: design-tokens.css (must be imported first)
 *
 * Components included:
 * - Buttons
 * - Cards
 * - Badges
 * - Forms
 * - Loading States
 * - Empty States
 * - Alerts/Notifications
 */


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

.btn {
    /* Layout */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);

    /* Spacing */
    padding: var(--space-3) var(--space-4);

    /* Typography */
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-tight);
    text-decoration: none;
    text-align: center;

    /* Visual */
    border: var(--border-width-medium) solid transparent;
    border-radius: var(--border-radius-md);
    background: transparent;

    /* Interaction */
    cursor: pointer;
    user-select: none;
    transition: var(--transition-all);

    /* Accessibility - WCAG 2.5.5 */
    min-height: 44px;
    min-width: 44px;
}

.btn:hover {
    opacity: 0.9;
    box-shadow: var(--shadow-sm);
}

.btn:active {
    opacity: 1;
}

.btn:focus-visible {
    outline: 3px solid var(--color-primary-500);
    outline-offset: 2px;
    box-shadow: var(--shadow-focus);
}

.btn:disabled {
    opacity: var(--opacity-60);
    cursor: not-allowed;
    border: var(--border-width-medium) dashed var(--color-border-medium);
    transform: none;
    box-shadow: none;
}


/* Button Variants */
.btn--primary {
    background: var(--color-primary-500);
    color: var(--color-text-inverse);
    border-color: var(--color-primary-500);
}

.btn--primary:hover {
    background: var(--color-primary-600);
    border-color: var(--color-primary-600);
}

.btn--primary:active {
    background: var(--color-primary-700);
}

.btn--secondary {
    background: transparent;
    border-color: var(--color-border-medium);
    color: var(--color-text-primary);
}

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

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

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

.btn--warning {
    background: var(--color-warning);
    color: var(--color-text-inverse);
    border-color: var(--color-warning);
}

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

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

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

.btn--ghost {
    background: transparent;
    border-color: transparent;
    color: var(--color-primary-500);
}

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


/* Button Sizes */
.btn--xs {
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
    min-height: 32px;
    min-width: 32px;
}

.btn--sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
    min-height: 36px;
    min-width: 36px;
}

.btn--lg {
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-lg);
    min-height: 52px;
    min-width: 52px;
}

.btn--xl {
    padding: var(--space-5) var(--space-8);
    font-size: var(--font-size-xl);
    min-height: 60px;
    min-width: 60px;
}


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


/* Icon-only buttons */
.btn--icon {
    padding: var(--space-3);
    min-width: 44px;
    aspect-ratio: 1;
}


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

.card {
    /* Layout */
    display: flex;
    flex-direction: column;

    /* Visual */
    background: var(--color-background-primary);
    border: var(--border-width-thin) solid var(--color-border-light);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);

    /* Spacing */
    padding: var(--space-6);

    /* Interaction */
    transition: var(--transition-shadow);
}

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

.card--interactive {
    cursor: pointer;
}

.card--interactive:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--color-border-medium);
}

.card--interactive:active {
    opacity: 0.95;
}


/* Card Header */
.card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-4);
    border-bottom: var(--border-width-thin) solid var(--color-border-light);
}

.card__title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin: 0;
}

.card__subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: var(--space-1) 0 0 0;
}


/* Card Body */
.card__body {
    flex: 1;
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}


/* Card Footer */
.card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: var(--border-width-thin) solid var(--color-border-light);
}


/* Card Variants */
.card--compact {
    padding: var(--space-4);
}

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

.card--flat {
    box-shadow: none;
}


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

.badge {
    /* Layout */
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);

    /* Spacing */
    padding: var(--space-1) var(--space-3);

    /* Typography */
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    line-height: 1;

    /* Visual */
    border-radius: var(--border-radius-full);
    white-space: nowrap;
}


/* Priority Badges (P1/P2/P3) */
.badge--p1,
.badge--priority-p1 {
    background: rgba(244, 67, 54, 0.1);
    color: var(--color-priority-p1);
    border: var(--border-width-thin) solid var(--color-priority-p1);
}

.badge--p2,
.badge--priority-p2 {
    background: rgba(255, 152, 0, 0.1);
    color: var(--color-priority-p2);
    border: var(--border-width-thin) solid var(--color-priority-p2);
}

.badge--p3,
.badge--priority-p3 {
    background: rgba(76, 175, 80, 0.1);
    color: var(--color-priority-p3);
    border: var(--border-width-thin) solid var(--color-priority-p3);
}


/* Geographic Badges (K1/K2/K3) */
.badge--k1,
.badge--geo-k1 {
    background: rgba(33, 150, 243, 0.1);
    color: var(--color-geo-k1);
    border: var(--border-width-thin) solid var(--color-geo-k1);
}

.badge--k2,
.badge--geo-k2 {
    background: rgba(156, 39, 176, 0.1);
    color: var(--color-geo-k2);
    border: var(--border-width-thin) solid var(--color-geo-k2);
}

.badge--k3,
.badge--geo-k3 {
    background: rgba(96, 125, 139, 0.1);
    color: var(--color-geo-k3);
    border: var(--border-width-thin) solid var(--color-geo-k3);
}


/* Semantic Badges */
.badge--success {
    background: rgba(76, 175, 80, 0.1);
    color: var(--color-success-dark);
    border: var(--border-width-thin) solid var(--color-success);
}

.badge--warning {
    background: rgba(255, 152, 0, 0.1);
    color: var(--color-warning-dark);
    border: var(--border-width-thin) solid var(--color-warning);
}

.badge--error {
    background: rgba(244, 67, 54, 0.1);
    color: var(--color-error-dark);
    border: var(--border-width-thin) solid var(--color-error);
}

.badge--info {
    background: rgba(33, 150, 243, 0.1);
    color: var(--color-info-dark);
    border: var(--border-width-thin) solid var(--color-info);
}


/* Badge Sizes */
.badge--sm {
    padding: var(--space-0-5) var(--space-2);
    font-size: 10px;
}

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


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

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.form-label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
}

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

.form-input,
.form-select,
.form-textarea {
    /* Layout */
    width: 100%;

    /* Spacing */
    padding: var(--space-3) var(--space-4);

    /* Typography */
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);

    /* Visual */
    background: var(--color-background-primary);
    border: var(--border-width-thin) solid var(--color-border-medium);
    border-radius: var(--border-radius-md);

    /* Interaction */
    transition: var(--transition-colors);

    /* Accessibility */
    min-height: 44px;
}

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

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: var(--shadow-focus);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
    background: var(--color-background-secondary);
    color: var(--color-text-disabled);
    cursor: not-allowed;
    opacity: var(--opacity-60);
}

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


/* Form Helper Text */
.form-help {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    margin-top: var(--space-1);
}

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

.form-input--error,
.form-select--error,
.form-textarea--error {
    border-color: var(--color-error);
}

.form-input--error:focus,
.form-select--error:focus,
.form-textarea--error:focus {
    box-shadow: 0 0 0 3px rgba(244, 67, 54, 0.3);
}


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

/* Spinner */
.loading,
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--color-border-light);
    border-top-color: var(--color-primary-500);
    border-radius: var(--border-radius-full);
    animation: spin 0.8s linear infinite;
}

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

.spinner--sm {
    width: 16px;
    height: 16px;
    border-width: 2px;
}

.spinner--lg {
    width: 32px;
    height: 32px;
    border-width: 4px;
}

.spinner--xl {
    width: 48px;
    height: 48px;
    border-width: 5px;
}


/* Skeleton Loader */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-gray-200) 25%,
        var(--color-gray-100) 50%,
        var(--color-gray-200) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--border-radius-md);
    min-height: 1em;
}

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

.skeleton--text {
    height: 1em;
    margin-bottom: var(--space-2);
}

.skeleton--title {
    height: 1.5em;
    width: 60%;
    margin-bottom: var(--space-4);
}

.skeleton--avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-full);
}

.skeleton--card {
    height: 200px;
}


/* Loading Overlay */
.loading-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(var(--blur-sm));
    z-index: var(--z-index-fixed);
}

.loading-overlay--fullscreen {
    position: fixed;
}


/* ============================================
   EMPTY STATES
   ============================================ */

.empty-state {
    /* Layout */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    /* Spacing */
    padding: var(--space-16) var(--space-8);
    text-align: center;

    /* Visual */
    color: var(--color-text-secondary);
}

.empty-state__icon {
    font-size: var(--font-size-4xl);
    color: var(--color-gray-400);
    margin-bottom: var(--space-4);
}

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

.empty-state__description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    max-width: 400px;
    margin: 0 0 var(--space-6) 0;
    line-height: var(--line-height-relaxed);
}

.empty-state__action {
    margin-top: var(--space-4);
}

/* Main empty state for dashboard */
.empty-state-main {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-16) var(--space-8);
    text-align: center;
    min-height: 50vh;
}

.empty-state-main h2 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin: 0 0 var(--space-2) 0;
}

.empty-state-main p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin: 0 0 var(--space-6) 0;
}

.empty-state-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    justify-content: center;
    align-items: center;
}


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

.alert {
    /* Layout */
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);

    /* Spacing */
    padding: var(--space-4);

    /* Visual */
    border-left: 4px solid transparent;
    border-radius: var(--border-radius-md);

    /* Typography */
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
}

.alert__icon {
    font-size: var(--font-size-lg);
    flex-shrink: 0;
}

.alert__content {
    flex: 1;
}

.alert__title {
    font-weight: var(--font-weight-semibold);
    margin: 0 0 var(--space-1) 0;
}

.alert__message {
    margin: 0;
}

.alert__close {
    flex-shrink: 0;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    color: inherit;
    opacity: var(--opacity-60);
    transition: var(--transition-colors);
}

.alert__close:hover {
    opacity: var(--opacity-100);
}


/* Alert Variants */
.alert--success {
    background: rgba(76, 175, 80, 0.1);
    border-color: var(--color-success);
    color: var(--color-success-dark);
}

.alert--warning {
    background: rgba(255, 152, 0, 0.1);
    border-color: var(--color-warning);
    color: var(--color-warning-dark);
}

.alert--error {
    background: rgba(244, 67, 54, 0.1);
    border-color: var(--color-error);
    color: var(--color-error-dark);
}

.alert--info {
    background: rgba(33, 150, 243, 0.1);
    border-color: var(--color-info);
    color: var(--color-info-dark);
}


/* Toast Notifications */
.toast {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    max-width: 400px;
    z-index: var(--z-index-tooltip);

    /* Animation */
    animation: slideIn 0.3s var(--ease-out);
}

@keyframes slideIn {
    from {
        transform: translateX(120%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast--exit {
    animation: slideOut 0.3s var(--ease-in) forwards;
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(120%);
        opacity: 0;
    }
}


/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Truncate text */
.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.line-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}


/* Divider */
.divider {
    height: var(--border-width-thin);
    background: var(--color-border-light);
    border: none;
    margin: var(--space-6) 0;
}

.divider--vertical {
    width: var(--border-width-thin);
    height: auto;
    margin: 0 var(--space-4);
}


/* Responsive Utilities */
@media (max-width: 768px) {
    .card {
        padding: var(--space-4);
    }

    .empty-state {
        padding: var(--space-12) var(--space-4);
    }

    .toast {
        left: var(--space-4);
        right: var(--space-4);
        max-width: none;
    }
}