/* ============================================================
   PersonalStudy — Courses Page UX Enhancements (Priority 2)
   Card interactions · Progress rings · Skeleton loading · Hover states
   
   Add in index.php (applies to student/courses.php page):
   Already included via ux_priority2.css + this file adds courses-specific enhancements
   
   <link href="assets/courses_ux.css" rel="stylesheet">
   ============================================================ */


/* ============================================================
   COURSE CARD INTERACTIONS — Enhanced hover, press, focus
   ============================================================ */

.ps-course-item {
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    position: relative;
    overflow: hidden;
}

/* Subtle gradient overlay on hover */
.ps-course-item::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(108, 99, 255, 0.02), transparent 60%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    border-radius: inherit;
}

.ps-course-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(108, 99, 255, 0.10), 0 2px 8px rgba(0, 0, 0, 0.04);
    border-color: rgba(108, 99, 255, 0.15);
}

.ps-course-item:hover::after {
    opacity: 1;
}

/* Press/active state for touch */
.ps-course-item:active {
    transform: translateY(-1px) scale(0.99);
    transition-duration: 0.1s;
}

/* Focus state for keyboard users */
.ps-course-item:focus-within {
    outline: 2px solid var(--primary, #6C63FF);
    outline-offset: 2px;
}

/* Icon bounce on card hover */
.ps-course-icon {
    transition: transform 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.ps-course-item:hover .ps-course-icon {
    transform: scale(1.12) rotate(-3deg);
}


/* ============================================================
   PROGRESS BAR → RING UPGRADE (Optional)
   When .ps-course-ring is present, hide bar, show ring
   ============================================================ */

.ps-course-item.has-ring .ps-course-progress .ps-course-bar {
    display: none;
}

.ps-course-ring-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
}

.ps-course-ring-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.ps-course-ring-pct {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--text-primary, #111827);
}

.ps-course-ring-label {
    font-size: 0.72rem;
    color: var(--text-secondary, #6b7280);
}


/* ============================================================
   CATEGORY HEADER ENHANCEMENTS
   ============================================================ */

.ps-category-header {
    transition: padding-left 0.3s ease;
}

.ps-category:hover .ps-category-header {
    padding-left: 8px;
}

.ps-category-icon {
    transition: transform 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.ps-category:hover .ps-category-icon {
    transform: scale(1.1) rotate(-5deg);
}


/* ============================================================
   BUTTON ENHANCEMENTS
   ============================================================ */

.ps-course-btn {
    position: relative;
    overflow: hidden;
    transition: all 0.2s ease;
}

/* Ripple effect container */
.ps-course-btn::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background: radial-gradient(circle, rgba(255,255,255,0.3) 10%, transparent 10%);
    background-size: 1000% 1000%;
    background-position: center;
    opacity: 0;
    transition: background-size 0.4s ease, opacity 0.3s ease;
    pointer-events: none;
}

.ps-course-btn:active::after {
    background-size: 100% 100%;
    opacity: 1;
    transition: 0s;
}

/* Primary button hover glow */
.ps-course-btn-primary:hover {
    box-shadow: 0 4px 16px rgba(108, 99, 255, 0.3);
}


/* ============================================================
   SKELETON LOADING FOR COURSE CARDS
   ============================================================ */

.ps-course-item.skeleton {
    pointer-events: none;
}

.ps-course-item.skeleton .ps-course-icon,
.ps-course-item.skeleton .ps-course-name,
.ps-course-item.skeleton .ps-course-meta,
.ps-course-item.skeleton .ps-course-bar-fill,
.ps-course-item.skeleton .ps-course-btn {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmerCourse 1.5s infinite;
    color: transparent !important;
    border-color: transparent !important;
}

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

[data-theme="dark"] .ps-course-item.skeleton .ps-course-icon,
[data-theme="dark"] .ps-course-item.skeleton .ps-course-name,
[data-theme="dark"] .ps-course-item.skeleton .ps-course-meta,
[data-theme="dark"] .ps-course-item.skeleton .ps-course-bar-fill,
[data-theme="dark"] .ps-course-item.skeleton .ps-course-btn {
    background: linear-gradient(90deg, #2a2d3e 25%, #333750 50%, #2a2d3e 75%);
    background-size: 200% 100%;
}


/* ============================================================
   STAGGERED ENTRY ANIMATION
   ============================================================ */

@keyframes courseCardEnter {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.ps-course-grid .ps-course-item {
    animation: courseCardEnter 0.4s ease forwards;
    opacity: 0;
}

.ps-course-grid .ps-course-item:nth-child(1) { animation-delay: 0.05s; }
.ps-course-grid .ps-course-item:nth-child(2) { animation-delay: 0.12s; }
.ps-course-grid .ps-course-item:nth-child(3) { animation-delay: 0.19s; }
.ps-course-grid .ps-course-item:nth-child(4) { animation-delay: 0.26s; }
.ps-course-grid .ps-course-item:nth-child(5) { animation-delay: 0.33s; }
.ps-course-grid .ps-course-item:nth-child(6) { animation-delay: 0.40s; }


/* ============================================================
   EMPTY STATE
   ============================================================ */

.ps-courses-empty {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-muted, #9ca3af);
}

.ps-courses-empty-icon {
    font-size: 3rem;
    margin-bottom: 12px;
    opacity: 0.5;
}

.ps-courses-empty-text {
    font-size: 0.9rem;
    font-weight: 500;
}


/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 640px) {
    .ps-course-item:hover {
        transform: none; /* No hover lift on touch — only active press */
        box-shadow: none;
    }
    
    .ps-course-item:active {
        transform: scale(0.98);
    }

    /* Disable entry animation on mobile for speed */
    .ps-course-grid .ps-course-item {
        animation: none;
        opacity: 1;
    }
}


/* ============================================================
   REDUCED MOTION
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
    .ps-course-item,
    .ps-course-icon,
    .ps-category-icon,
    .ps-course-btn {
        transition: none !important;
    }
    
    .ps-course-grid .ps-course-item {
        animation: none;
        opacity: 1;
    }
    
    @keyframes shimmerCourse { from, to { background-position: 0 0; } }
}