/* ============================================================================
 * Farmonx UI Components — v77.1 (Stage 3 of UI/UX modernization)
 *
 * Framework-agnostic CSS classes matching shadcn/ui v4 aesthetics, adapted to
 * vanilla HTML + Jinja templates (no React required). All classes reference
 * design-tokens.css vars so theme switching works automatically.
 *
 * Use new classes (.ui-button, .ui-card, .ui-input, .ui-dialog, .ui-toast,
 * .ui-badge) in NEW templates. Legacy classes (.btn-primary, .modal, etc.)
 * continue to work via legacy CSS — gradual migration.
 *
 * Load order: design-tokens.css → components.css → page-specific styles.
 * ========================================================================== */

/* ============================================================================
 * 1. BUTTON — primary/secondary/ghost/destructive/outline + sm/md/lg/icon
 * ========================================================================== */

.ui-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0 var(--space-4);
    height: 2.25rem;            /* 36px — default */
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    line-height: 1;
    white-space: nowrap;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    user-select: none;
    transition: background-color var(--duration-normal) var(--ease),
                border-color var(--duration-normal) var(--ease),
                color var(--duration-normal) var(--ease),
                box-shadow var(--duration-normal) var(--ease),
                transform 100ms var(--ease);
    text-decoration: none;
    background: var(--color-primary);
    color: var(--color-primary-fg);
}
.ui-button:hover         { background: var(--color-primary-hover); }
.ui-button:active        { transform: scale(0.97); }
.ui-button:focus-visible { outline: 2px solid var(--color-ring); outline-offset: 2px; }
.ui-button:disabled      { opacity: 0.5; cursor: not-allowed; transform: none; }

/* ─── variants ──────────────────────────────────────────────────────── */
.ui-button--secondary {
    background: var(--color-secondary);
    color: var(--color-secondary-fg);
}
.ui-button--secondary:hover { background: var(--color-secondary-hover); }

.ui-button--ghost {
    background: transparent;
    color: var(--color-fg);
}
.ui-button--ghost:hover { background: var(--color-accent); color: var(--color-accent-fg); }

.ui-button--outline {
    background: transparent;
    color: var(--color-fg);
    border-color: var(--color-border);
}
.ui-button--outline:hover {
    background: var(--color-accent);
    border-color: var(--color-fg-muted);
}

.ui-button--destructive {
    background: var(--color-danger);
    color: var(--color-danger-fg);
}
.ui-button--destructive:hover { background: #b91c1c; }

.ui-button--success {
    background: var(--color-success);
    color: var(--color-success-fg);
}
.ui-button--success:hover { background: #15803d; }

.ui-button--link {
    background: transparent;
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 4px;
    height: auto;
    padding: 0;
}
.ui-button--link:hover { color: var(--color-primary-hover); }

/* ─── sizes ─────────────────────────────────────────────────────────── */
.ui-button--sm    { height: 2rem; padding: 0 var(--space-3); font-size: var(--text-xs); border-radius: var(--radius-sm); }
.ui-button--lg    { height: 2.75rem; padding: 0 var(--space-6); font-size: var(--text-md); border-radius: var(--radius-lg); }
.ui-button--icon  { width: 2.25rem; padding: 0; }
.ui-button--icon.ui-button--sm { width: 2rem; }
.ui-button--icon.ui-button--lg { width: 2.75rem; }

/* ─── full-width helper ─────────────────────────────────────────────── */
.ui-button--full  { width: 100%; }

/* ============================================================================
 * 2. CARD — content container with subtle elevation
 * ========================================================================== */

.ui-card {
    background: var(--color-card);
    color: var(--color-card-fg);
    border: 1px solid var(--color-card-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}
.ui-card--elevated  { box-shadow: var(--shadow-md); border-color: transparent; }
.ui-card--flat      { box-shadow: none; }

.ui-card__header {
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--color-border);
}
.ui-card__title {
    font-size: var(--text-lg);
    font-weight: var(--weight-semibold);
    margin: 0;
    line-height: var(--leading-snug);
}
.ui-card__description {
    margin-top: var(--space-1);
    font-size: var(--text-sm);
    color: var(--color-fg-muted);
}
.ui-card__body { padding: var(--space-5) var(--space-6); }
.ui-card__footer {
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: flex-end;
    gap: var(--space-2);
}

/* ============================================================================
 * 3. INPUT / TEXTAREA / SELECT
 * ========================================================================== */

.ui-input,
.ui-textarea,
.ui-select {
    display: block;
    width: 100%;
    padding: 0 var(--space-3);
    height: 2.25rem;
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--color-fg);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: border-color var(--duration-normal) var(--ease),
                box-shadow var(--duration-normal) var(--ease);
}
.ui-input::placeholder,
.ui-textarea::placeholder { color: var(--color-fg-subtle); }
.ui-input:focus,
.ui-textarea:focus,
.ui-select:focus {
    outline: none;
    border-color: var(--color-ring);
    box-shadow: 0 0 0 3px rgba(139, 0, 0, 0.12);  /* brand ring */
}
.ui-input:disabled        { opacity: 0.5; cursor: not-allowed; background: var(--color-muted); }
.ui-input--invalid        { border-color: var(--color-danger); }
.ui-input--invalid:focus  { box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.12); }

.ui-textarea {
    height: auto;
    min-height: 5rem;
    padding: var(--space-2) var(--space-3);
    line-height: var(--leading-normal);
    resize: vertical;
}
.ui-select {
    appearance: none;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2383827d' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>");
    background-repeat: no-repeat;
    background-position: right var(--space-3) center;
    padding-right: var(--space-8);
}

.ui-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--color-fg);
    margin-bottom: var(--space-2);
    line-height: 1;
}
.ui-form-help {
    font-size: var(--text-xs);
    color: var(--color-fg-muted);
    margin-top: var(--space-1);
}
.ui-form-error {
    font-size: var(--text-xs);
    color: var(--color-danger);
    margin-top: var(--space-1);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

/* ============================================================================
 * 4. DIALOG / MODAL — replaces alert(), confirm(), inline modals
 * ========================================================================== */

.ui-dialog-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 9998;
    animation: ui-fade-in var(--duration-slow) var(--ease);
}

.ui-dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2xl);
    width: 90%;
    max-width: 32rem;
    max-height: 85vh;
    overflow-y: auto;
    z-index: 9999;
    animation: ui-dialog-in var(--duration-slow) var(--ease);
}
.ui-dialog__header {
    padding: var(--space-5) var(--space-6) var(--space-3);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-4);
}
.ui-dialog__title {
    font-size: var(--text-lg);
    font-weight: var(--weight-semibold);
    margin: 0;
    color: var(--color-card-fg);
}
.ui-dialog__close {
    background: transparent;
    border: none;
    cursor: pointer;
    width: 1.75rem;
    height: 1.75rem;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-fg-muted);
    font-size: 1.25rem;
    line-height: 1;
}
.ui-dialog__close:hover {
    background: var(--color-accent);
    color: var(--color-accent-fg);
}
.ui-dialog__body {
    padding: var(--space-3) var(--space-6);
    color: var(--color-card-fg);
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
}
.ui-dialog__footer {
    padding: var(--space-4) var(--space-6) var(--space-5);
    display: flex;
    justify-content: flex-end;
    gap: var(--space-2);
}

@keyframes ui-fade-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}
@keyframes ui-dialog-in {
    from { opacity: 0; transform: translate(-50%, -48%) scale(0.96); }
    to   { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

/* ============================================================================
 * 5. TOAST — sonner-inspired notifications stack
 * ========================================================================== */

.ui-toast-container {
    position: fixed;
    top: var(--space-4);
    right: var(--space-4);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    max-width: 22rem;
    pointer-events: none;
}

.ui-toast {
    background: var(--color-bg-elevated);
    color: var(--color-card-fg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    line-height: var(--leading-snug);
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    pointer-events: auto;
    animation: ui-toast-in var(--duration-slow) var(--ease);
    min-width: 16rem;
}
.ui-toast--success { border-left: 4px solid var(--color-success); }
.ui-toast--warning { border-left: 4px solid var(--color-warning); }
.ui-toast--error   { border-left: 4px solid var(--color-danger); }
.ui-toast--info    { border-left: 4px solid var(--color-info); }

.ui-toast__icon {
    flex-shrink: 0;
    width: 1.25rem;
    height: 1.25rem;
    margin-top: 0.0625rem;
}
.ui-toast--success .ui-toast__icon { color: var(--color-success); }
.ui-toast--warning .ui-toast__icon { color: var(--color-warning); }
.ui-toast--error   .ui-toast__icon { color: var(--color-danger); }
.ui-toast--info    .ui-toast__icon { color: var(--color-info); }

.ui-toast__content { flex: 1; min-width: 0; }
.ui-toast__title   { font-weight: var(--weight-semibold); margin-bottom: var(--space-1); }
.ui-toast__description { color: var(--color-fg-muted); font-size: var(--text-xs); }

.ui-toast__close {
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--color-fg-muted);
    width: 1.5rem;
    height: 1.5rem;
    flex-shrink: 0;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: auto;
}
.ui-toast__close:hover { background: var(--color-accent); color: var(--color-fg); }

@keyframes ui-toast-in {
    from { opacity: 0; transform: translateX(20px); }
    to   { opacity: 1; transform: translateX(0); }
}
@keyframes ui-toast-out {
    from { opacity: 1; transform: translateX(0); max-height: 200px; margin-bottom: var(--space-2); }
    to   { opacity: 0; transform: translateX(20px); max-height: 0; padding: 0; margin: 0; border: 0; }
}
.ui-toast--exiting { animation: ui-toast-out 250ms var(--ease) forwards; }

/* ============================================================================
 * 6. BADGE — small status indicators
 * ========================================================================== */

.ui-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 0 var(--space-2);
    height: 1.25rem;
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
    line-height: 1;
    border-radius: var(--radius-full);
    background: var(--color-secondary);
    color: var(--color-secondary-fg);
    white-space: nowrap;
}
.ui-badge--primary     { background: var(--color-primary); color: var(--color-primary-fg); }
.ui-badge--success     { background: var(--color-success-bg); color: var(--color-success); }
.ui-badge--warning     { background: var(--color-warning-bg); color: var(--color-warning-fg); }
.ui-badge--danger      { background: var(--color-danger-bg); color: var(--color-danger); }
.ui-badge--info        { background: var(--color-info-bg); color: var(--color-info); }
.ui-badge--outline     { background: transparent; border: 1px solid var(--color-border); color: var(--color-fg); }
.ui-badge--dot::before {
    content: '';
    width: 0.375rem;
    height: 0.375rem;
    border-radius: var(--radius-full);
    background: currentColor;
}

/* ============================================================================
 * 7. SWITCH — toggle alternative to checkbox
 * ========================================================================== */

.ui-switch {
    position: relative;
    display: inline-flex;
    align-items: center;
    width: 2.75rem;
    height: 1.5rem;
    background: var(--color-input);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background-color var(--duration-normal) var(--ease);
    flex-shrink: 0;
}
.ui-switch input { opacity: 0; position: absolute; pointer-events: none; }
.ui-switch::before {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 1.25rem;
    height: 1.25rem;
    background: white;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-sm);
    transition: transform var(--duration-normal) var(--ease);
}
.ui-switch:has(input:checked),
.ui-switch[aria-checked="true"] { background: var(--color-primary); }
.ui-switch:has(input:checked)::before,
.ui-switch[aria-checked="true"]::before { transform: translateX(1.25rem); }
.ui-switch:focus-visible        { outline: 2px solid var(--color-ring); outline-offset: 2px; }

/* ============================================================================
 * 8. SEPARATOR
 * ========================================================================== */

.ui-separator {
    height: 1px;
    width: 100%;
    background: var(--color-border);
    border: none;
    margin: var(--space-4) 0;
}
.ui-separator--vertical {
    height: 100%;
    width: 1px;
    margin: 0 var(--space-4);
}

/* ============================================================================
 * 9. SKELETON — loading placeholders
 * ========================================================================== */

.ui-skeleton {
    background: linear-gradient(90deg,
        var(--color-muted) 0%,
        var(--color-accent) 50%,
        var(--color-muted) 100%);
    background-size: 200% 100%;
    animation: ui-skeleton-shimmer 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}
@keyframes ui-skeleton-shimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ============================================================================
 * 10. AVATAR
 * ========================================================================== */

.ui-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    color: var(--color-primary-fg);
    font-weight: var(--weight-semibold);
    font-size: var(--text-sm);
    overflow: hidden;
    flex-shrink: 0;
}
.ui-avatar img        { width: 100%; height: 100%; object-fit: cover; display: block; }
.ui-avatar--sm        { width: 2rem; height: 2rem; font-size: var(--text-xs); }
.ui-avatar--lg        { width: 3rem; height: 3rem; font-size: var(--text-md); }
.ui-avatar--xl        { width: 4rem; height: 4rem; font-size: var(--text-lg); }

/* ============================================================================
 * 11. EMPTY STATE — for screens with no data
 * ========================================================================== */

.ui-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-12) var(--space-6);
    gap: var(--space-3);
}
.ui-empty__icon {
    width: 3rem;
    height: 3rem;
    color: var(--color-fg-muted);
    margin-bottom: var(--space-2);
}
.ui-empty__title {
    font-size: var(--text-lg);
    font-weight: var(--weight-semibold);
    color: var(--color-fg);
    margin: 0;
}
.ui-empty__description {
    color: var(--color-fg-muted);
    font-size: var(--text-sm);
    max-width: 24rem;
    margin: 0;
    line-height: var(--leading-relaxed);
}
.ui-empty__action { margin-top: var(--space-3); }

/* ============================================================================
 * 12. KBD — keyboard shortcut display
 * ========================================================================== */

.ui-kbd {
    display: inline-flex;
    align-items: center;
    padding: 0 var(--space-2);
    height: 1.375rem;
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--color-fg-muted);
    background: var(--color-muted);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    box-shadow: 0 1px 0 var(--color-border);
}