/**
 * UI/UX Fixes for EduTrack LMS
 * - Mobile touch targets (min 44px)
 * - Better focus indicators
 * - Loading states
 * - Empty states
 */

/* ========================================
   MOBILE TOUCH TARGETS (min 44px)
   ======================================== */

/* Navigation links */
.nav-link,
.sidebar-link,
.mobile-menu a,
footer a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
}

/* Buttons */
button,
.btn-primary,
.btn-secondary,
[type="submit"],
[type="button"] {
    min-height: 44px;
    min-width: 44px;
}

/* Form inputs */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="tel"],
input[type="number"],
select,
textarea {
    min-height: 44px;
}

/* Pagination links */
.pagination a,
.pagination button {
    min-width: 44px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* Table action buttons */
table td a,
table td button {
    min-width: 44px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* ========================================
   FOCUS INDICATORS (Accessibility)
   ======================================== */

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid #3B82F6;
    outline-offset: 2px;
}

/* Skip to content link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: #000;
    color: #fff;
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

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

.empty-state {
    text-align: center;
    padding: 3rem 1.5rem;
    color: #6B7280;
}

.empty-state-icon {
    font-size: 4rem;
    color: #D1D5DB;
    margin-bottom: 1rem;
}

.empty-state-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #374151;
    margin-bottom: 0.5rem;
}

.empty-state-description {
    font-size: 0.875rem;
    max-width: 400px;
    margin: 0 auto 1.5rem;
}

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

.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: 4px;
}

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

.skeleton-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.skeleton-image {
    height: 200px;
    background: #E5E7EB;
}

.skeleton-content {
    padding: 1rem;
    space-y: 0.75rem;
}

.skeleton-line {
    height: 1rem;
    background: #E5E7EB;
    border-radius: 4px;
}

.skeleton-line.short {
    width: 60%;
}

/* Button loading spinner */
.btn-loading {
    position: relative;
    color: transparent !important;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

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

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

.toast-container {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    pointer-events: none;
}

.toast {
    pointer-events: auto;
    min-width: 300px;
    max-width: 500px;
    animation: toast-slide-in 0.3s ease-out;
}

.toast.hiding {
    animation: toast-slide-out 0.3s ease-in forwards;
}

@keyframes toast-slide-in {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes toast-slide-out {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

/* ========================================
   MODAL IMPROVEMENTS
   ======================================== */

.modal-backdrop {
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    animation: modal-fade-in 0.2s ease-out;
}

@keyframes modal-fade-in {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ========================================
   TABLE RESPONSIVENESS
   ======================================== */

.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table-responsive table {
    min-width: 640px;
}

/* ========================================
   FORM IMPROVEMENTS
   ======================================== */

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: #374151;
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid #D1D5DB;
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus {
    border-color: #3B82F6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-error {
    color: #DC2626;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.form-hint {
    color: #6B7280;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
    .no-print,
    nav,
    footer,
    .toast-container,
    #page-loading-overlay {
        display: none !important;
    }
    
    body {
        background: white;
    }
    
    .container {
        max-width: 100%;
    }
}