/* PEMDAS Pathway - Learning Preferences Panel */
/* Comprehensive customization options for all learners */

:root {
    /* ========================================
       PREFERENCE PANEL VARIABLES
       ======================================== */
    
    --preference-panel-width: 400px;
    --preference-panel-max-height: 80vh;
    --preference-section-gap: var(--space-6);
    --preference-item-gap: var(--space-4);
    --preference-toggle-size: 20px;
    --preference-slider-height: 6px;
    --preference-slider-thumb: 20px;
}

/* ========================================
   PREFERENCE PANEL OVERLAY
   ======================================== */

.preferences-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    animation: preferencesFadeIn 0.3s ease-out;
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}

@keyframes preferencesFadeIn {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

.preferences-panel {
    background: white;
    border-radius: var(--radius-3xl);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
    width: 100%;
    max-width: var(--preference-panel-width);
    max-height: var(--preference-panel-max-height);
    overflow: hidden;
    animation: preferencesSlideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

@keyframes preferencesSlideIn {
    0% {
        opacity: 0;
        transform: scale(0.9) translateY(-20px);
    }
    100% {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* ========================================
   PREFERENCE PANEL HEADER
   ======================================== */

.preferences-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: var(--space-8) var(--space-8) var(--space-6);
    position: relative;
    overflow: hidden;
}

.preferences-header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(transparent, rgba(255, 255, 255, 0.1), transparent);
    animation: headerRotate 8s linear infinite;
}

@keyframes headerRotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.preferences-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 0 var(--space-2) 0;
    position: relative;
    z-index: 1;
}

.preferences-subtitle {
    font-size: 0.875rem;
    opacity: 0.9;
    margin: 0;
    position: relative;
    z-index: 1;
}

.preferences-close {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
    z-index: 2;
}

.preferences-close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

/* ========================================
   PREFERENCE PANEL BODY
   ======================================== */

.preferences-body {
    padding: var(--space-8);
    max-height: calc(var(--preference-panel-max-height) - 120px);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-300) transparent;
}

.preferences-body::-webkit-scrollbar {
    width: 6px;
}

.preferences-body::-webkit-scrollbar-track {
    background: transparent;
}

.preferences-body::-webkit-scrollbar-thumb {
    background: var(--primary-300);
    border-radius: 3px;
}

.preferences-body::-webkit-scrollbar-thumb:hover {
    background: var(--primary-400);
}

/* ========================================
   PREFERENCE SECTIONS
   ======================================== */

.preference-section {
    margin-bottom: var(--preference-section-gap);
}

.preference-section:last-child {
    margin-bottom: 0;
}

.preference-section-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-800);
    margin: 0 0 var(--space-4) 0;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.preference-section-icon {
    font-size: 1.25rem;
    color: var(--primary-500);
}

/* ========================================
   PREFERENCE ITEMS
   ======================================== */

.preference-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
    cursor: pointer;
    border: 2px solid transparent;
}

.preference-item:hover {
    background: var(--gray-50);
    border-color: var(--gray-200);
}

.preference-item.active {
    background: var(--primary-50);
    border-color: var(--primary-200);
}

.preference-control {
    margin-top: 2px;
    flex-shrink: 0;
}

.preference-content {
    flex: 1;
}

.preference-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-800);
    margin: 0 0 var(--space-1) 0;
    line-height: 1.4;
}

.preference-description {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin: 0;
    line-height: 1.5;
}

/* ========================================
   TOGGLE SWITCHES
   ======================================== */

.preference-toggle {
    position: relative;
    width: 44px;
    height: 24px;
    background: var(--gray-300);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    outline: none;
}

.preference-toggle:focus {
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.preference-toggle.active {
    background: var(--primary-500);
}

.preference-toggle::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.preference-toggle.active::after {
    transform: translateX(20px);
}

/* ========================================
   RANGE SLIDERS
   ======================================== */

.preference-range {
    width: 100%;
    height: var(--preference-slider-height);
    background: var(--gray-200);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
}

.preference-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: var(--preference-slider-thumb);
    height: var(--preference-slider-thumb);
    background: var(--primary-500);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(102, 126, 234, 0.3);
    transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.preference-range::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.preference-range::-moz-range-thumb {
    width: var(--preference-slider-thumb);
    height: var(--preference-slider-thumb);
    background: var(--primary-500);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(102, 126, 234, 0.3);
}

.preference-range-value {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-600);
    margin-left: var(--space-2);
    min-width: 30px;
    text-align: right;
}

/* ========================================
   SELECT DROPDOWNS
   ======================================== */

.preference-select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-lg);
    background: white;
    font-size: 0.875rem;
    color: var(--gray-800);
    cursor: pointer;
    transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.preference-select:focus {
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    outline: none;
}

.preference-select:hover {
    border-color: var(--gray-400);
}

/* ========================================
   COLOR PICKERS
   ======================================== */

.preference-color-group {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.preference-color-option {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 3px solid transparent;
    cursor: pointer;
    transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
    position: relative;
}

.preference-color-option:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.preference-color-option.active {
    border-color: var(--gray-800);
    transform: scale(1.15);
}

.preference-color-option::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-weight: 700;
    font-size: 0.875rem;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.preference-color-option.active::after {
    opacity: 1;
}

/* ========================================
   LEARNING STYLE SELECTION
   ======================================== */

.learning-style-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--space-3);
}

.learning-style-option {
    padding: var(--space-4);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
    background: white;
}

.learning-style-option:hover {
    border-color: var(--primary-300);
    background: var(--primary-50);
}

.learning-style-option.active {
    border-color: var(--primary-500);
    background: var(--primary-100);
    transform: scale(1.02);
}

.learning-style-icon {
    font-size: 2rem;
    margin-bottom: var(--space-2);
    display: block;
}

.learning-style-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-800);
    margin: 0;
}

/* ========================================
   PREFERENCE PANEL FOOTER
   ======================================== */

.preferences-footer {
    padding: var(--space-6) var(--space-8);
    border-top: 1px solid var(--gray-200);
    background: var(--gray-50);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-3);
}

.preference-actions {
    display: flex;
    gap: var(--space-3);
}

.preference-reset {
    background: none;
    border: 1px solid var(--gray-300);
    color: var(--gray-600);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    cursor: pointer;
    transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.preference-reset:hover {
    background: var(--gray-100);
    border-color: var(--gray-400);
}

.preference-save {
    background: var(--primary-500);
    color: white;
    border: none;
    padding: var(--space-2) var(--space-6);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.preference-save:hover {
    background: var(--primary-600);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

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

@media (max-width: 768px) {
    .preferences-overlay {
        padding: var(--space-4);
    }
    
    .preferences-panel {
        max-width: none;
        width: 100%;
    }
    
    .preferences-header {
        padding: var(--space-6) var(--space-6) var(--space-4);
    }
    
    .preferences-body {
        padding: var(--space-6);
    }
    
    .preferences-footer {
        padding: var(--space-4) var(--space-6);
        flex-direction: column;
        align-items: stretch;
    }
    
    .preference-actions {
        justify-content: center;
    }
    
    .learning-style-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .preferences-overlay {
        padding: var(--space-2);
    }
    
    .preferences-header {
        padding: var(--space-4) var(--space-4) var(--space-3);
    }
    
    .preferences-body {
        padding: var(--space-4);
    }
    
    .preferences-footer {
        padding: var(--space-3) var(--space-4);
    }
}

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

/* High contrast mode */
@media (prefers-contrast: high) {
    .preferences-panel {
        border: 2px solid var(--gray-900);
    }
    
    .preference-item {
        border-width: 2px;
    }
    
    .preference-toggle {
        border: 2px solid var(--gray-800);
    }
    
    .preference-range {
        border: 1px solid var(--gray-800);
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    .preferences-overlay,
    .preferences-panel,
    .preference-item,
    .preference-toggle,
    .preference-color-option,
    .learning-style-option {
        animation: none;
        transition: none;
    }
    
    .preferences-header::before {
        animation: none;
    }
}

/* ========================================
   PREFERENCE STATES
   ======================================== */

.preferences-hidden {
    display: none !important;
}

.preferences-visible {
    display: flex !important;
}

.preference-loading {
    opacity: 0.6;
    pointer-events: none;
}

.preference-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid var(--primary-300);
    border-top-color: var(--primary-500);
    border-radius: 50%;
    animation: preferenceSpin 1s linear infinite;
}

@keyframes preferenceSpin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}