/**
 * DFS Shipping - Unified Application Styles
 * Mobile-first responsive design with Tailwind CSS enhancements
 * Version: 2.0
 */

/* ===== CSS VARIABLES ===== */
:root {
    --primary: #d97706;
    --primary-dark: #b45309;
    --primary-light: #fbbf24;
    --secondary: #64748b;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --dark: #0f172a;
    --light: #f8fafc;
    
    /* Safe areas for mobile */
    --safe-top: env(safe-area-inset-top);
    --safe-bottom: env(safe-area-inset-bottom);
    --safe-left: env(safe-area-inset-left);
    --safe-right: env(safe-area-inset-right);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-2xl: 2rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition: 200ms ease;
    --transition-slow: 300ms ease;
}

/* ===== BASE STYLES ===== */
* {
    -webkit-tap-highlight-color: transparent;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overscroll-behavior-y: contain;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* Hide scrollbar on mobile - thin scrollbar still visible for scrollable containers */
@media (max-width: 768px) {
    ::-webkit-scrollbar {
        width: 3px;
        height: 3px;
    }
    
    .scrollbar-hide::-webkit-scrollbar {
        display: none;
    }
    
    .scrollbar-hide {
        scrollbar-width: none;
    }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ===== HIGH CONTRAST ===== */
@media (prefers-contrast: high) {
    :root {
        --primary: #b45309;
        --primary-dark: #92400e;
    }
    
    .btn-primary {
        border: 2px solid #000;
    }
}

/* ===== FOCUS VISIBLE ===== */
:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(100%);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

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

.animate-fade-in { animation: fadeIn var(--transition-slow) ease-out; }
.animate-fade-in-up { animation: fadeInUp var(--transition-slow) ease-out; }
.animate-fade-in-down { animation: fadeInDown var(--transition-slow) ease-out; }
.animate-slide-in-up { animation: slideInUp var(--transition-slow) ease-out; }
.animate-slide-in-right { animation: slideInRight var(--transition-slow) ease-out; }
.animate-slide-in-left { animation: slideInLeft var(--transition-slow) ease-out; }
.animate-scale-in { animation: scaleIn var(--transition-slow) ease-out; }
.animate-bounce { animation: bounce 0.5s ease; }
.animate-pulse { animation: pulse 2s ease-in-out infinite; }
.animate-spin { animation: spin 1s linear infinite; }

/* Skeleton loading */
.skeleton {
    background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius);
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    font-size: 0.875rem;
    border-radius: var(--radius-xl);
    transition: all var(--transition);
    cursor: pointer;
    white-space: nowrap;
    border: none;
    outline: none;
}

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 14px 0 rgba(217, 119, 6, 0.4);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    box-shadow: 0 6px 20px 0 rgba(217, 119, 6, 0.5);
    transform: translateY(-2px);
}

.btn-secondary {
    background: linear-gradient(135deg, #64748b, #475569);
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    background: linear-gradient(135deg, #475569, #334155);
}

.btn-success {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
}

.btn-outline {
    background: transparent;
    border: 2px solid #e2e8f0;
    color: #64748b;
}

.btn-outline:hover:not(:disabled) {
    background: #f8fafc;
    border-color: #cbd5e1;
}

.btn-outline-primary {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

.btn-outline-primary:hover:not(:disabled) {
    background: var(--primary);
    color: white;
}

.btn-ghost {
    background: transparent;
    color: #64748b;
}

.btn-ghost:hover:not(:disabled) {
    background: #f1f5f9;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-icon {
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    border-radius: var(--radius-full);
}

.btn-icon-lg {
    width: 3rem;
    height: 3rem;
}

/* ===== INPUTS ===== */
.input {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid #e2e8f0;
    border-radius: var(--radius-xl);
    font-size: 1rem;
    transition: all var(--transition);
    background: white;
}

.input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(217, 119, 6, 0.1);
}

.input:disabled {
    background: #f8fafc;
    cursor: not-allowed;
}

.input-error {
    border-color: var(--danger);
}

.input-error:focus {
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.1);
}

.input-group {
    position: relative;
}

.input-group .input {
    padding-left: 3rem;
}

.input-group .input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: #94a3b8;
}

.input-group .input-action {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
}

/* Select */
.select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.75rem center;
    background-repeat: no-repeat;
    background-size: 1.5rem;
    padding-right: 2.5rem;
}

/* ===== CARDS ===== */
.card {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: all var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-body {
    padding: 1.5rem;
}

.card-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid #f1f5f9;
    font-weight: 600;
}

.card-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid #f1f5f9;
    background: #fafafa;
}

/* Product Card */
.product-card {
    background: white;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition);
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.product-card .product-image {
    position: relative;
    aspect-ratio: 1;
    overflow: hidden;
    background: #f8fafc;
}

.product-card .product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-card .product-actions {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    opacity: 0;
    transform: translateX(10px);
    transition: all var(--transition);
}

.product-card:hover .product-actions {
    opacity: 1;
    transform: translateX(0);
}

.product-card .product-badge {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
}

.product-card .product-info {
    padding: 1rem;
}

.product-card .product-title {
    font-weight: 600;
    color: #1e293b;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-card .product-price {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--primary);
}

.product-card .product-price-old {
    font-size: 0.875rem;
    color: #94a3b8;
    text-decoration: line-through;
}

/* ===== BADGES ===== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.badge-primary {
    background: rgba(217, 119, 6, 0.1);
    color: var(--primary);
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.badge-info {
    background: rgba(59, 130, 246, 0.1);
    color: var(--info);
}

.badge-dark {
    background: #1e293b;
    color: white;
}

/* ===== BOTTOM SHEET ===== */
.bottom-sheet {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
    box-shadow: var(--shadow-2xl);
    z-index: 1050;
    transform: translateY(100%);
    transition: transform var(--transition-slow) ease-out;
    max-height: 90vh;
    overflow-y: auto;
    padding-bottom: var(--safe-bottom);
}

.bottom-sheet.open {
    transform: translateY(0);
}

.bottom-sheet-handle {
    width: 40px;
    height: 4px;
    background: #e2e8f0;
    border-radius: 2px;
    margin: 0.75rem auto;
}

.bottom-sheet-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid #f1f5f9;
}

.bottom-sheet-body {
    padding: 1.5rem;
}

/* ===== MODAL ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
    width: 100%;
    max-width: 32rem;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.95);
    opacity: 0;
    transition: all var(--transition-slow);
}

.modal-open .modal-content {
    transform: scale(1);
    opacity: 1;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem;
    border-bottom: 1px solid #f1f5f9;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    display: flex;
    gap: 1rem;
    padding: 1.5rem;
    border-top: 1px solid #f1f5f9;
}

/* ===== NAVIGATION - MOBILE BOTTOM NAV ===== */
.mobile-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    border-top: 1px solid #e2e8f0;
    padding-bottom: var(--safe-bottom);
    z-index: 40;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
}

.mobile-nav-inner {
    display: flex;
    justify-content: space-around;
    align-items: center;
    height: 4rem;
}

.mobile-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    flex: 1;
    padding: 0.5rem;
    color: #94a3b8;
    transition: all var(--transition);
    text-decoration: none;
}

.mobile-nav-item.active {
    color: var(--primary);
}

.mobile-nav-item:active {
    transform: scale(0.95);
}

.mobile-nav-item i {
    font-size: 1.25rem;
}

.mobile-nav-item span {
    font-size: 0.625rem;
    font-weight: 600;
}

.mobile-nav-item .nav-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    min-width: 16px;
    height: 16px;
    background: var(--danger);
    color: white;
    font-size: 0.625rem;
    font-weight: 700;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid white;
}

/* ===== QUANTITY SELECTOR ===== */
.qty-selector {
    display: inline-flex;
    align-items: center;
    background: #f8fafc;
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.qty-selector button {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: #64748b;
    cursor: pointer;
    transition: all var(--transition);
}

.qty-selector button:hover {
    background: #e2e8f0;
    color: #1e293b;
}

.qty-selector button:active {
    transform: scale(0.95);
}

.qty-selector input {
    width: 3rem;
    text-align: center;
    border: none;
    background: transparent;
    font-weight: 600;
    font-size: 1rem;
}

.qty-selector input:focus {
    outline: none;
}

/* ===== LOADING SPINNER ===== */
.spinner {
    width: 3rem;
    height: 3rem;
    border: 4px solid #e2e8f0;
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.spinner-sm {
    width: 1.5rem;
    height: 1.5rem;
    border-width: 2px;
}

.spinner-lg {
    width: 4rem;
    height: 4rem;
    border-width: 5px;
}

/* ===== RATING STARS ===== */
.rating {
    display: inline-flex;
    gap: 0.125rem;
}

.rating-star {
    color: #e2e8f0;
}

.rating-star.filled {
    color: #fbbf24;
}

.rating-star.half {
    background: linear-gradient(90deg, #fbbf24 50%, #e2e8f0 50%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ===== TABS ===== */
.tabs {
    display: flex;
    gap: 0.5rem;
    border-bottom: 2px solid #f1f5f9;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.tab-item {
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    font-size: 0.875rem;
    color: #64748b;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    white-space: nowrap;
    transition: all var(--transition);
    cursor: pointer;
}

.tab-item:hover {
    color: var(--primary);
}

.tab-item.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* ===== ALERTS ===== */
.alert {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem 1.25rem;
    border-radius: var(--radius-xl);
    margin-bottom: 1rem;
}

.alert-icon {
    flex-shrink: 0;
    width: 1.5rem;
    height: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    color: #065f46;
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    color: #991b1b;
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    color: #92400e;
}

.alert-info {
    background: rgba(59, 130, 246, 0.1);
    color: #1e40af;
}

/* ===== SAFE AREAS (iOS) ===== */
.pb-safe {
    padding-bottom: calc(1rem + var(--safe-bottom));
}

.pt-safe {
    padding-top: calc(1rem + var(--safe-top));
}

/* ===== UTILITY CLASSES ===== */
.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-info { color: var(--info); }

.bg-primary { background-color: var(--primary); }
.bg-success { background-color: var(--success); }
.bg-danger { background-color: var(--danger); }
.bg-warning { background-color: var(--warning); }
.bg-info { background-color: var(--info); }

.border-primary { border-color: var(--primary); }

/* Hide on desktop */
@media (min-width: 1024px) {
    .lg\:hidden { display: none !important; }
}

/* Show only on mobile */
@media (max-width: 1023px) {
    .mobile-only { display: block; }
    .desktop-only { display: none !important; }
}

/* ===== RESPONSIVE CONTAINER ===== */
.container {
    width: 100%;
    margin: 0 auto;
    padding: 0 1rem;
}

@media (min-width: 640px) {
    .container { max-width: 640px; }
}

@media (min-width: 768px) {
    .container { max-width: 768px; }
}

@media (min-width: 1024px) {
    .container { max-width: 1024px; }
}

@media (min-width: 1280px) {
    .container { max-width: 1280px; }
}

/* ===== SWIPER CUSTOMIZATION ===== */
.swiper-pagination-bullet {
    background: white;
    opacity: 0.5;
}

.swiper-pagination-bullet-active {
    background: var(--primary);
    opacity: 1;
}

/* ===== EMPTY STATES ===== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    text-align: center;
}

.empty-state-icon {
    width: 5rem;
    height: 5rem;
    background: #f1f5f9;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.empty-state-icon i {
    font-size: 2rem;
    color: #94a3b8;
}

.empty-state-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 0.5rem;
}

.empty-state-text {
    color: #64748b;
    margin-bottom: 1.5rem;
}

/* ===== TABLE RESPONSIVE ===== */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid #f1f5f9;
}

.table th {
    font-weight: 600;
    color: #64748b;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: #f8fafc;
}

.table tbody tr:hover {
    background: #fafafa;
}

/* ===== PRINT STYLES ===== */
@media print {
    .mobile-nav,
    .bottom-sheet,
    .modal,
    .btn,
    .no-print {
        display: none !important;
    }
    
    body {
        background: white !important;
    }
}