/* ============================================================
   app.css — Supplementary styles for UX improvements
   Loading states, form validation, accessibility, toasts
   ============================================================ */

/* ===== ACCESSIBILITY ===== */

/* Skip-to-content link (visible on Tab focus) */
.skip-to-content {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10000;
    background: var(--primary-color, #6366f1);
    color: #fff;
    padding: 12px 24px;
    border-radius: 0 0 var(--radius-sm, 8px) var(--radius-sm, 8px);
    font-weight: 600;
    font-size: 14px;
    text-decoration: none;
    transition: top 0.2s;
    box-shadow: var(--shadow-lg);
}

.skip-to-content:focus {
    top: 0;
    color: #fff;
    outline: 3px solid rgba(255, 255, 255, 0.5);
    outline-offset: -3px;
}

/* Enhanced focus-visible outlines for keyboard users */
:focus-visible {
    outline: 3px solid var(--primary-color, #6366f1);
    outline-offset: 2px;
}

/* Remove outline for mouse clicks */
:focus:not(:focus-visible) {
    outline: none;
}

/* Screen reader only (Bootstrap has sr-only but adding visually-hidden) */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .dashboard-card:hover {
        transform: none !important;
    }

    .btn:hover,
    .btn-nav:hover {
        transform: none !important;
    }
}


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

/* Button loading spinner */
.btn.is-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.8;
}

.btn.is-loading .btn-text {
    visibility: hidden;
}

.btn.is-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 18px;
    height: 18px;
    margin-top: -9px;
    margin-left: -9px;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: btn-spin 0.6s linear infinite;
}

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

/* Full-page loading overlay */
.loading-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 16px;
}

.loading-overlay.is-active {
    display: flex;
}

.loading-overlay .spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color, #e2e8f0);
    border-top-color: var(--primary-color, #6366f1);
    border-radius: 50%;
    animation: btn-spin 0.7s linear infinite;
}

.loading-overlay .loading-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary, #475569);
}

/* Skeleton loading placeholders */
.skeleton {
    background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s ease-in-out infinite;
    border-radius: var(--radius-sm, 8px);
    min-height: 20px;
}

.skeleton-text {
    height: 14px;
    margin-bottom: 8px;
    width: 80%;
}

.skeleton-text-short {
    width: 40%;
}

.skeleton-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.skeleton-card {
    height: 120px;
    margin-bottom: 16px;
}

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


/* ===== FORM VALIDATION ===== */

/* Custom validation feedback (used with JS) */
.form-control.is-validated:valid,
.form-select.is-validated:valid {
    border-color: var(--success-color, #10b981);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='%2310b981' d='M2.3 6.73.6 4.53c-.4-1.04.46-1.4 1.1-.8l1.1 1.4 3.4-3.8c.6-.63 1.6-.27 1.2.7l-4 4.6c-.43.5-.8.4-1.1.1z'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
    padding-right: calc(1.5em + 0.75rem);
}

.form-control.is-validated:invalid,
.form-select.is-validated:invalid {
    border-color: var(--danger-color, #ef4444);
}

/* Password strength meter */
.password-strength {
    height: 4px;
    border-radius: 2px;
    background: var(--border-color, #e2e8f0);
    margin-top: 6px;
    overflow: hidden;
}

.password-strength-bar {
    height: 100%;
    border-radius: 2px;
    transition: width 0.3s, background-color 0.3s;
    width: 0;
}

.password-strength-bar[data-strength="weak"] {
    width: 25%;
    background-color: var(--danger-color, #ef4444);
}

.password-strength-bar[data-strength="fair"] {
    width: 50%;
    background-color: var(--warning-color, #f59e0b);
}

.password-strength-bar[data-strength="good"] {
    width: 75%;
    background-color: var(--info-color, #3b82f6);
}

.password-strength-bar[data-strength="strong"] {
    width: 100%;
    background-color: var(--success-color, #10b981);
}

.password-strength-label {
    font-size: 11px;
    font-weight: 600;
    margin-top: 4px;
    color: var(--text-tertiary, #64748b);
}


/* ===== TOAST NOTIFICATIONS ===== */

.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10001;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
    max-width: 380px;
    width: calc(100% - 40px);
}

.app-toast {
    pointer-events: auto;
    background: var(--bg-card, #fff);
    border-radius: var(--radius-md, 12px);
    padding: 14px 18px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color, #e2e8f0);
    display: flex;
    align-items: flex-start;
    gap: 12px;
    transform: translateX(120%);
    opacity: 0;
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.35s;
    font-size: 13px;
    line-height: 1.5;
}

.app-toast.is-visible {
    transform: translateX(0);
    opacity: 1;
}

.app-toast.is-removing {
    transform: translateX(120%);
    opacity: 0;
}

.app-toast .toast-icon {
    flex-shrink: 0;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    margin-top: 1px;
}

.app-toast .toast-content {
    flex: 1;
    min-width: 0;
}

.app-toast .toast-title {
    font-weight: 700;
    font-size: 13px;
    margin-bottom: 2px;
}

.app-toast .toast-message {
    color: var(--text-secondary, #475569);
}

.app-toast .toast-close {
    background: none;
    border: none;
    color: var(--text-muted, #94a3b8);
    cursor: pointer;
    padding: 2px;
    font-size: 14px;
    line-height: 1;
    flex-shrink: 0;
}

.app-toast .toast-close:hover {
    color: var(--text-primary, #0f172a);
}

/* Toast type variants */
.app-toast.toast-success .toast-icon { background: var(--success-light, #d1fae5); color: var(--success-color, #10b981); }
.app-toast.toast-danger .toast-icon  { background: var(--danger-light, #fee2e2);  color: var(--danger-color, #ef4444); }
.app-toast.toast-warning .toast-icon { background: var(--warning-light, #fef3c7); color: var(--warning-color, #f59e0b); }
.app-toast.toast-info .toast-icon    { background: var(--info-light, #dbeafe);    color: var(--info-color, #3b82f6); }


/* ===== FLASH MESSAGE AUTO-DISMISS ===== */

.alert[data-auto-dismiss] {
    transition: opacity 0.4s, transform 0.4s;
}

.alert[data-auto-dismiss].dismissing {
    opacity: 0;
    transform: translateY(-10px);
}


/* ===== MISC UX ENHANCEMENTS ===== */

/* Smooth scroll behavior (respects reduced-motion) */
html {
    scroll-behavior: smooth;
}

/* Better table responsiveness */
.table-responsive {
    -webkit-overflow-scrolling: touch;
}

/* Badge count animation (for notification badges) */
.badge-pulse {
    animation: badge-pulse 2s ease-in-out infinite;
}

@keyframes badge-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

/* Print-friendly styles */
@media print {
    .sidebar,
    .mobile-header,
    .sidebar-overlay,
    .toast-container,
    .loading-overlay,
    .skip-to-content,
    .btn-group,
    .no-print {
        display: none !important;
    }

    .main-content {
        margin-left: 0 !important;
        padding: 0 !important;
    }

    .dashboard-card {
        break-inside: avoid;
        box-shadow: none !important;
        border: 1px solid #ddd !important;
    }
}


/* ===== HIGH CONTRAST MODE ===== */

@media (prefers-contrast: high) {
    .dashboard-card {
        border-width: 2px;
    }

    .btn {
        border-width: 2px;
    }

    .form-control,
    .form-select {
        border-width: 2px;
    }
}