/**
 * Enhanced UI/UX Improvements for Pentora Platform
 * Modern design enhancements for better user experience
 */

/* ============================================================================
   ENHANCED CARD INTERACTIONS
   ============================================================================ */

.quiz-card, .subject-card, .topic-card, .feature-card {
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.quiz-card::before, .subject-card::before, .topic-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
    pointer-events: none;
}

.quiz-card:hover::before, .subject-card:hover::before, .topic-card:hover::before {
    left: 100%;
}

/* Enhanced hover states with better performance */
.quiz-card:hover, .subject-card:hover, .topic-card:hover, .feature-card:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.1),
        0 0 0 1px rgba(59, 130, 246, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    border-color: rgba(59, 130, 246, 0.3);
}

/* ============================================================================
   ENHANCED BUTTONS AND INTERACTIVE ELEMENTS
   ============================================================================ */

.btn, .start-exam-btn, button[type="submit"] {
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn::before, .start-exam-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.3s ease, height 0.3s ease;
    pointer-events: none;
}

.btn:active::before, .start-exam-btn:active::before {
    width: 300px;
    height: 300px;
}

/* Enhanced focus states for accessibility */
.btn:focus, .start-exam-btn:focus, button:focus, input:focus, textarea:focus {
    outline: 2px solid #3b82f6;
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

/* ============================================================================
   LOADING STATES AND SKELETONS
   ============================================================================ */

.loading-skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading-shimmer 1.5s infinite;
    border-radius: 8px;
}

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

.card-loading {
    min-height: 200px;
    position: relative;
}

.card-loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.4) 50%, transparent 100%);
    animation: loading-sweep 2s infinite;
}

@keyframes loading-sweep {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* ============================================================================
   ENHANCED MOBILE INTERACTIONS
   ============================================================================ */

@media (max-width: 768px) {
    /* Larger touch targets for mobile */
    .btn, .quiz-card, .subject-card, .topic-card {
        min-height: 48px;
        min-width: 48px;
    }
    
    /* Enhanced mobile hover states (touch feedback) */
    .quiz-card:active, .subject-card:active, .topic-card:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }
    
    /* Better mobile spacing */
    .quiz-card, .subject-card, .topic-card {
        margin-bottom: 1rem;
    }
    
    /* Mobile-optimized animations */
    .quiz-card, .subject-card, .topic-card {
        animation-duration: 0.3s;
    }
}

/* ============================================================================
   ENHANCED VISUAL FEEDBACK
   ============================================================================ */

/* Success states */
.success-feedback {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    padding: 1rem;
    border-radius: 8px;
    animation: success-pulse 0.5s ease-out;
}

@keyframes success-pulse {
    0% { transform: scale(0.95); opacity: 0; }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); opacity: 1; }
}

/* Error states */
.error-feedback {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
    padding: 1rem;
    border-radius: 8px;
    animation: error-shake 0.5s ease-out;
}

@keyframes error-shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* ============================================================================
   ENHANCED PROGRESS INDICATORS
   ============================================================================ */

.progress-bar-enhanced {
    background: #e5e7eb;
    border-radius: 10px;
    overflow: hidden;
    position: relative;
    height: 8px;
}

.progress-fill-enhanced {
    background: linear-gradient(90deg, #3b82f6, #1d4ed8, #3b82f6);
    background-size: 200% 100%;
    height: 100%;
    border-radius: 10px;
    animation: progress-shimmer 2s infinite;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ============================================================================
   ENHANCED TOOLTIPS AND POPOVERS
   ============================================================================ */

.tooltip-enhanced {
    position: relative;
}

.tooltip-enhanced::before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 14px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
    z-index: 1000;
}

.tooltip-enhanced::after {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-2px);
    border: 4px solid transparent;
    border-top-color: rgba(0, 0, 0, 0.9);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1000;
}

.tooltip-enhanced:hover::before,
.tooltip-enhanced:hover::after {
    opacity: 1;
    transform: translateX(-50%) translateY(-4px);
}

/* ============================================================================
   ENHANCED FORM ELEMENTS
   ============================================================================ */

.form-input-enhanced {
    position: relative;
    transition: all 0.3s ease;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
}

.form-input-enhanced:focus {
    border-color: #3b82f6;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.form-input-enhanced.error {
    border-color: #ef4444;
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.1);
}

.form-input-enhanced.success {
    border-color: #10b981;
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.1);
}

/* ============================================================================
   ENHANCED ACCESSIBILITY FEATURES
   ============================================================================ */

/* High contrast mode support */
@media (prefers-contrast: high) {
    .quiz-card, .subject-card, .topic-card {
        border: 2px solid #000;
        background: #fff;
        color: #000;
    }
    
    .btn, .start-exam-btn {
        border: 2px solid #000;
        background: #fff;
        color: #000;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .quiz-card, .subject-card, .topic-card,
    .btn, .start-exam-btn,
    .loading-skeleton,
    .progress-fill-enhanced {
        animation: none;
        transition: none;
    }
    
    .quiz-card:hover, .subject-card:hover, .topic-card:hover {
        transform: none;
    }
}

/* Focus visible for keyboard navigation */
.focus-visible:focus {
    outline: 2px solid #3b82f6;
    outline-offset: 2px;
}

/* ============================================================================
   ENHANCED DARK MODE SUPPORT
   ============================================================================ */

@media (prefers-color-scheme: dark) {
    .quiz-card, .subject-card, .topic-card {
        background: rgba(31, 41, 55, 0.8);
        border-color: rgba(75, 85, 99, 0.3);
        color: #f9fafb;
    }
    
    .loading-skeleton {
        background: linear-gradient(90deg, #374151 25%, #4b5563 50%, #374151 75%);
        background-size: 200% 100%;
    }
    
    .form-input-enhanced {
        background: rgba(31, 41, 55, 0.8);
        border-color: #4b5563;
        color: #f9fafb;
    }
}

/* ============================================================================
   ENHANCED MICRO-INTERACTIONS
   ============================================================================ */

.micro-bounce {
    animation: micro-bounce 0.6s ease-out;
}

@keyframes micro-bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-2px); }
}

.micro-pulse {
    animation: micro-pulse 2s infinite;
}

@keyframes micro-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.micro-glow {
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
    animation: micro-glow 2s ease-in-out infinite alternate;
}

@keyframes micro-glow {
    from { box-shadow: 0 0 20px rgba(59, 130, 246, 0.3); }
    to { box-shadow: 0 0 30px rgba(59, 130, 246, 0.5); }
}