/**
 * Mobile-First UI/UX Improvements for Univeroo
 * Critical improvements for mobile usability and touch interactions
 *
 * Table of Contents:
 * 1. CSS Custom Properties (Design Tokens)
 * 2. Touch Target Improvements
 * 3. Responsive Grid Overrides
 * 4. Mobile Cart Cards
 * 5. Filter Sidebar
 * 6. Book Card Improvements
 * 7. Search Improvements
 * 8. Progressive Checkout
 * 9. Form Validation Styles
 * 10. Focus States (WCAG Compliance)
 * 11. Utility Classes
 */

/* ============================================
   1. CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ============================================ */
:root {
    /* Colors */
    --primary-color: #ff5a5f;
    --primary-hover: #e54e53;
    --secondary-color: #484848;
    --text-primary: #222222;
    --text-secondary: #6c757d;
    --text-muted: #999999;
    --border-color: #dee2e6;
    --bg-light: #f8f9fa;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Typography */
    --font-size-xs: 0.75rem;   /* 12px */
    --font-size-sm: 0.875rem;  /* 14px */
    --font-size-base: 1rem;    /* 16px */
    --font-size-lg: 1.125rem;  /* 18px */
    --font-size-xl: 1.25rem;   /* 20px */
    --font-size-2xl: 1.5rem;   /* 24px */

    /* Touch Targets */
    --touch-target-min: 44px;
    --touch-target-optimal: 48px;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;

    /* Borders */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15);
}

/* ============================================
   2. TOUCH TARGET IMPROVEMENTS (WCAG 2.5.5)
   ============================================ */

/* All buttons meet 48px minimum height */
.btn,
button[type="submit"],
button[type="button"],
.btn-thm,
.btn-thm2-light,
.search-btn {
    min-height: var(--touch-target-optimal);
    padding: 12px 24px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

/* Quantity controls - 44x44px minimum */
.quantity-block button,
.quantity-arrow-minus,
.quantity-arrow-plus {
    min-width: var(--touch-target-min);
    min-height: var(--touch-target-min);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border: 1px solid var(--border-color);
    background: #fff;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.quantity-arrow-minus:hover,
.quantity-arrow-plus:hover {
    background: var(--bg-light);
    border-color: var(--primary-color);
}

.quantity-arrow-minus:active,
.quantity-arrow-plus:active {
    transform: scale(0.95);
}

/* Form checkboxes and radio buttons - 24x24px minimum */
input[type="checkbox"],
input[type="radio"] {
    min-width: 24px;
    min-height: 24px;
    cursor: pointer;
}

.form-check-input {
    width: 24px;
    height: 24px;
}

/* Links - minimum 44px height */
a {
    min-height: var(--touch-target-min);
    display: inline-flex;
    align-items: center;
}

/* Ensure 8px spacing between adjacent interactive elements */
.btn + .btn,
button + button,
a + a {
    margin-left: var(--spacing-sm);
}

/* ============================================
   3. RESPONSIVE GRID OVERRIDES
   ============================================ */

/* Ensure proper spacing between grid items on mobile */
@media (max-width: 575.98px) {
    .shop_item {
        margin-bottom: var(--spacing-lg);
    }

    /* Full width cards on very small screens */
    .col-12 .shop_item {
        max-width: 100%;
    }
}

/* Two columns on small tablets */
@media (min-width: 576px) and (max-width: 767.98px) {
    .col-sm-6 .shop_item {
        max-width: 100%;
    }
}

/* ============================================
   4. MOBILE CART CARDS
   ============================================ */

.cart-mobile-cards {
    padding: var(--spacing-sm);
}

.cart-mobile-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.cart-mobile-card-header {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.cart-mobile-card-image {
    flex-shrink: 0;
    width: 80px;
    height: 100px;
    object-fit: cover;
    border-radius: var(--border-radius-sm);
}

.cart-mobile-card-info {
    flex: 1;
    min-width: 0; /* Allow text truncation */
}

.cart-mobile-card-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.cart-mobile-card-author {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.cart-mobile-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.cart-mobile-card-quantity {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.cart-mobile-card-price {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
}

.cart-mobile-card-remove {
    min-width: var(--touch-target-min);
    min-height: var(--touch-target-min);
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fff;
    border: 1px solid var(--danger-color);
    color: var(--danger-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.cart-mobile-card-remove:hover {
    background: var(--danger-color);
    color: #fff;
}

/* ============================================
   5. FILTER SIDEBAR
   ============================================ */

.filters-sidebar {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.filters-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
}

.filters-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.filters-clear {
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    text-decoration: none;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.filters-clear:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.filter-group {
    margin-bottom: var(--spacing-lg);
}

.filter-group-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.filter-option {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) 0;
    cursor: pointer;
}

.filter-option input[type="checkbox"] {
    margin-right: var(--spacing-sm);
}

.filter-option label {
    cursor: pointer;
    user-select: none;
    flex: 1;
    min-height: var(--touch-target-min);
    display: flex;
    align-items: center;
}

.filter-count {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-left: auto;
}

/* Active filters pills */
.active-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.filter-pill {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 6px 12px;
    background: var(--primary-color);
    color: #fff;
    border-radius: 20px;
    font-size: var(--font-size-sm);
    white-space: nowrap;
}

.filter-pill-remove {
    background: none;
    border: none;
    color: #fff;
    cursor: pointer;
    padding: 0;
    margin-left: var(--spacing-xs);
    font-size: var(--font-size-lg);
    line-height: 1;
    min-width: auto;
    min-height: auto;
}

.filter-pill-remove:hover {
    opacity: 0.8;
}

/* Mobile filter toggle button */
.filters-mobile-toggle {
    width: 100%;
    margin-bottom: var(--spacing-lg);
    background: #fff;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    font-weight: 600;
}

.filters-mobile-toggle:hover {
    background: var(--primary-color);
    color: #fff;
}

/* Mobile: Filters as collapsible */
@media (max-width: 991.98px) {
    .filters-sidebar {
        position: fixed;
        top: 0;
        left: -100%;
        width: 85%;
        max-width: 320px;
        height: 100vh;
        z-index: 9999;
        overflow-y: auto;
        transition: left var(--transition-base);
        box-shadow: var(--shadow-lg);
    }

    .filters-sidebar.show {
        left: 0;
    }

    .filters-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        z-index: 9998;
        display: none;
    }

    .filters-backdrop.show {
        display: block;
    }
}

/* ============================================
   6. BOOK CARD IMPROVEMENTS
   ============================================ */

.shop_item {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    transition: all var(--transition-base);
    height: 100%;
    display: flex;
    flex-direction: column;
}

/* Hover effect on desktop */
@media (min-width: 992px) {
    .shop_item:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-lg);
        border-color: var(--primary-color);
    }
}

/* Book cover container with aspect ratio */
.shop_item .thumb {
    position: relative;
    width: 100%;
    padding-bottom: 140%; /* 5:7 aspect ratio for book covers */
    overflow: hidden;
    background: var(--bg-light);
}

.shop_item .thumb img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Format badge */
.format-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: var(--primary-color);
    color: #fff;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    z-index: 2;
}

.format-badge-icon {
    font-size: var(--font-size-sm);
}

/* Book details */
.shop_item .details {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    flex: 1;
}

/* Author - secondary */
.shop_item .sub_title {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.3;
}

/* Title - primary */
.shop_item .title {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.shop_item .title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.shop_item .title a:hover {
    color: var(--primary-color);
}

/* Publisher - tertiary */
.shop_item .review {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
}

.shop_item .review_count a {
    color: var(--text-muted);
    text-decoration: none;
}

/* Footer with price and ISBN */
.shop_item .si_footer {
    margin-top: auto;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.shop_item .price {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
}

.shop_item .isbn {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

/* ============================================
   7. SEARCH IMPROVEMENTS
   ============================================ */

/* Sticky search on mobile */
@media (max-width: 991.98px) {
    .mobile_menu_search_widget {
        position: sticky;
        top: 0;
        z-index: 1000;
        background: #fff;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-sm);
    }
}

/* Search input improvements */
.form_control {
    min-height: var(--touch-target-optimal);
    padding: 12px 16px;
    font-size: var(--font-size-base);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
}

.form_control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 90, 95, 0.1);
}

/* Search button */
.search-btn {
    min-width: var(--touch-target-optimal);
    min-height: var(--touch-target-optimal);
    background: var(--primary-color);
    border: none;
    border-radius: var(--border-radius-md);
    color: #fff;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.search-btn:hover {
    background: var(--primary-hover);
    transform: scale(1.05);
}

.search-btn:active {
    transform: scale(0.98);
}

/* ============================================
   8. PROGRESSIVE CHECKOUT
   ============================================ */

/* Delivery mode cards */
.delivery-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.delivery-option-card {
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    min-height: 72px;
}

.delivery-option-card:hover {
    border-color: var(--primary-color);
    background: rgba(255, 90, 95, 0.02);
}

.delivery-option-card.active {
    border-color: var(--primary-color);
    background: rgba(255, 90, 95, 0.05);
    box-shadow: var(--shadow-md);
}

.delivery-option-icon {
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 90, 95, 0.1);
    border-radius: 50%;
    flex-shrink: 0;
}

.delivery-option-info {
    flex: 1;
}

.delivery-option-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.delivery-option-price {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.delivery-option-radio {
    margin-left: auto;
}

/* Step indicators */
.checkout-steps {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.checkout-steps::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--border-color);
    z-index: 0;
}

.checkout-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
    position: relative;
    z-index: 1;
}

.checkout-step-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #fff;
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--text-muted);
    transition: all var(--transition-fast);
}

.checkout-step.active .checkout-step-number {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.checkout-step.completed .checkout-step-number {
    background: var(--success-color);
    border-color: var(--success-color);
    color: #fff;
}

.checkout-step-label {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-align: center;
}

.checkout-step.active .checkout-step-label {
    color: var(--text-primary);
    font-weight: 600;
}

/* Order summary improvements */
.order-summary-breakdown {
    padding: var(--spacing-md);
    background: var(--bg-light);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-md);
}

.order-summary-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    font-size: var(--font-size-base);
}

.order-summary-row.total {
    border-top: 2px solid var(--border-color);
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: 700;
}

.order-summary-label {
    color: var(--text-secondary);
}

.order-summary-value {
    color: var(--text-primary);
    font-weight: 600;
}

.order-summary-row.total .order-summary-value {
    color: var(--primary-color);
}

/* Trust badge */
.trust-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(40, 167, 69, 0.1);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-md);
    color: var(--success-color);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.trust-badge-icon {
    font-size: var(--font-size-lg);
}

/* ============================================
   9. FORM VALIDATION STYLES
   ============================================ */

.form-control,
.form-select {
    min-height: var(--touch-target-optimal);
    padding: 12px 16px;
    font-size: var(--font-size-base);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
}

.form-control:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 90, 95, 0.1);
}

.form-control.is-valid {
    border-color: var(--success-color);
    padding-right: 40px;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='%2328a745' d='M2.3 6.73L.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 12px center;
    background-size: 20px;
}

.form-control.is-invalid {
    border-color: var(--danger-color);
    padding-right: 40px;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='%23dc3545' viewBox='0 0 12 12'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath stroke-linejoin='round' d='M5.8 3.6h.4L6 6.5z'/%3e%3ccircle cx='6' cy='8.2' r='.6' fill='%23dc3545' stroke='none'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px;
}

.invalid-feedback {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--danger-color);
}

.valid-feedback {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--success-color);
}

.form-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-base);
}

/* Required field indicator */
.form-label.required::after {
    content: " *";
    color: var(--danger-color);
}

/* Helper text */
.form-text {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

/* ============================================
   10. FOCUS STATES (WCAG COMPLIANCE)
   ============================================ */

/* Visible focus indicator for all interactive elements */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Better focus for buttons */
.btn:focus,
button:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(255, 90, 95, 0.2);
}

/* Focus for form controls */
.form-control:focus,
.form-select:focus,
input:focus,
textarea:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 0;
    box-shadow: 0 0 0 3px rgba(255, 90, 95, 0.1);
}

/* Focus for links */
a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    text-decoration: underline;
}

/* Focus for checkboxes and radios */
input[type="checkbox"]:focus,
input[type="radio"]:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Skip to main content link (accessibility) */
.skip-to-main {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--primary-color);
    color: #fff;
    padding: 12px 24px;
    text-decoration: none;
    z-index: 10000;
}

.skip-to-main:focus {
    top: 0;
}

/* ============================================
   11. UTILITY CLASSES
   ============================================ */

/* Text utilities */
.text-truncate-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.text-truncate-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Spacing utilities */
.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
    cursor: wait;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--primary-color);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn var(--transition-base) ease-out;
}

/* Hide visually but keep for screen readers */
.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;
}

/* Responsive utilities */
@media (max-width: 575.98px) {
    .hide-xs { display: none !important; }
}

@media (min-width: 576px) and (max-width: 767.98px) {
    .hide-sm { display: none !important; }
}

@media (min-width: 768px) and (max-width: 991.98px) {
    .hide-md { display: none !important; }
}

@media (min-width: 992px) {
    .hide-lg { display: none !important; }
}

/* Print styles */
@media print {
    .no-print {
        display: none !important;
    }
}