/* ==========================================================================
   Apple Refurb - Common Styles
   ========================================================================== */

/* ==========================================================================
   CSS Custom Properties (Foundation Layer)
   ========================================================================== */

:root {
    /* Colors */
    --color-text: #1d1d1f;
    --color-text-muted: #86868b;
    --color-text-light: #6e6e73;
    --color-primary: #0071e3;
    --color-primary-hover: #0077ed;
    --color-success: #34c759;
    --color-success-dark: #2e7d32;
    --color-danger: #ff3b30;
    --color-danger-dark: #d32f2f;
    --color-warning: #ff9500;
    --color-warning-dark: #f57c00;
    --color-savings: #bf4800;
    --color-background: #f5f5f7;
    --color-surface: #ffffff;
    --color-border: #d2d2d7;
    --color-border-light: #e8e8ed;

    /* Product type colors */
    --color-mac: #0071e3;
    --color-ipad: #5856d6;
    --color-iphone: #bf4800;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'SF Pro Display', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.8125rem;  /* 13px */
    --font-size-base: 0.9375rem; /* 15px */
    --font-size-md: 1rem;       /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 1.875rem;  /* 30px */
    --font-size-4xl: 2.25rem;   /* 36px */

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.2;
    --line-height-base: 1.5;
    --line-height-relaxed: 1.625;

    /* Spacing Scale */
    --spacing-xs: 0.25rem;   /* 4px */
    --spacing-sm: 0.5rem;    /* 8px */
    --spacing-md: 1rem;      /* 16px */
    --spacing-lg: 1.5rem;    /* 24px */
    --spacing-xl: 2rem;      /* 32px */
    --spacing-2xl: 3rem;     /* 48px */

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12), 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 8px 32px rgba(0, 0, 0, 0.16), 0 4px 8px rgba(0, 0, 0, 0.08);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* ==========================================================================
   Base Typography
   ========================================================================== */

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-md); font-weight: var(--font-weight-medium); }
h6 { font-size: var(--font-size-base); font-weight: var(--font-weight-medium); }

/* Links */
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

/* Text utilities */
.text-muted {
    color: var(--color-text-muted) !important;
}

.text-success {
    color: var(--color-success-dark) !important;
}

.text-danger {
    color: var(--color-danger-dark) !important;
}

.text-warning {
    color: var(--color-warning-dark) !important;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    font-family: var(--font-family);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-md);
    padding: 0.5rem 1rem;
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
}

.btn-sm {
    padding: 0.35rem 0.75rem;
    font-size: var(--font-size-xs);
    border-radius: var(--radius-sm);
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-md);
}

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

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

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

.btn-outline-primary:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

/* ==========================================================================
   Forms
   ========================================================================== */

.form-control,
.form-select {
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-md);
    border-color: var(--color-border);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.15);
}

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

/* ==========================================================================
   Cards & Containers
   ========================================================================== */

.product-card,
.section-card {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-lg);
}

.stat-card {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.stat-value {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    line-height: var(--line-height-tight);
}

.stat-label {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
}

.chart-container {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

/* ==========================================================================
   Filter Panel
   ========================================================================== */

.filters {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.filter-group {
    min-width: 150px;
}

.filter-group .form-label {
    margin-bottom: var(--spacing-xs);
}

/* Multi-select */
.form-multi-select {
    min-width: 100%;
}

/* Range select (min/max dropdowns) */
.range-select {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.range-select .form-select {
    flex: 1;
    min-width: 0;
}

.range-select .range-sep {
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
    flex-shrink: 0;
}

/* ==========================================================================
   Tables
   ========================================================================== */

.table-responsive {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
}

.table {
    margin-bottom: 0;
    font-size: var(--font-size-sm);
}

.table th {
    background: var(--color-background);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 0.025em;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border-light);
    position: sticky;
    top: 0;
    z-index: 10;
    white-space: nowrap;
}

.table td {
    padding: var(--spacing-md);
    vertical-align: middle;
    border-bottom: 1px solid var(--color-border-light);
}

.table tbody tr {
    transition: background-color var(--transition-fast);
}

.table tbody tr:hover {
    background-color: rgba(0, 113, 227, 0.04);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

/* Sortable headers */
th[data-sortable],
th[style*="cursor"] {
    cursor: pointer;
    user-select: none;
    position: relative;
    padding-right: calc(var(--spacing-md) + 20px);
}

th[data-sortable]:hover,
th[style*="cursor"]:hover {
    background-color: var(--color-border-light);
}

th[data-sortable]::after,
th.sorted-asc::after,
th.sorted-desc::after {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    opacity: 0.3;
    font-size: 0.7em;
}

th[data-sortable]::after {
    content: '↕';
}

th.sorted-asc::after {
    content: '▲';
    opacity: 1;
    color: var(--color-primary);
}

th.sorted-desc::after {
    content: '▼';
    opacity: 1;
    color: var(--color-primary);
}

/* ==========================================================================
   Price Display
   ========================================================================== */

.price {
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
}

.price-current {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
}

.original-price,
.price-original {
    text-decoration: line-through;
    color: var(--color-text-muted);
    font-size: 0.9em;
}

.price-original {
    font-size: var(--font-size-lg);
}

.savings,
.price-savings {
    color: var(--color-savings);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.price-savings {
    font-size: var(--font-size-base);
}

/* Savings badge for tables */
.savings-badge {
    display: inline-block;
    background: rgba(191, 72, 0, 0.1);
    color: var(--color-savings);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    margin-left: var(--spacing-xs);
}

/* ==========================================================================
   Product Images
   ========================================================================== */

.product-image {
    width: 80px;
    height: 80px;
    object-fit: contain;
    border-radius: var(--radius-sm);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    cursor: pointer;
}

.product-image:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

/* ==========================================================================
   Badges
   ========================================================================== */

.badge {
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-xs);
    padding: 0.35em 0.65em;
    border-radius: var(--radius-sm);
}

.badge-in-stock,
.badge-success {
    background-color: var(--color-success);
    color: white;
}

.badge-sold-out,
.badge-danger {
    background-color: var(--color-danger);
    color: white;
}

.badge-mac {
    background-color: var(--color-mac);
    color: white;
}

.badge-ipad {
    background-color: var(--color-ipad);
    color: white;
}

.badge-iphone {
    background-color: var(--color-iphone);
    color: white;
}

/* Status indicators */
.status-in-stock {
    color: var(--color-success-dark);
    font-weight: var(--font-weight-medium);
}

.status-sold-out {
    color: var(--color-danger-dark);
    font-weight: var(--font-weight-medium);
}

/* Volatility colors */
.high-volatility {
    color: var(--color-danger-dark);
    font-weight: var(--font-weight-semibold);
}

.medium-volatility {
    color: var(--color-warning-dark);
}

.low-volatility {
    color: var(--color-success-dark);
}

/* ==========================================================================
   Pagination
   ========================================================================== */

.pagination {
    gap: var(--spacing-xs);
}

.page-link {
    color: var(--color-primary);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    padding: 0.5rem 0.875rem;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

.page-link:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.page-item.active .page-link {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.page-item.disabled .page-link {
    color: var(--color-text-muted);
    background-color: var(--color-background);
}

/* ==========================================================================
   Empty States
   ========================================================================== */

.empty-state {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
    color: var(--color-text-muted);
}

.empty-state h5 {
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    font-weight: var(--font-weight-semibold);
}

.empty-state p {
    max-width: 400px;
    margin: 0 auto var(--spacing-md);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.empty-state .empty-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

/* Empty state illustration */
.empty-state-illustration {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--spacing-lg);
    opacity: 0.6;
}

.empty-state-illustration svg {
    width: 100%;
    height: 100%;
}

/* Table empty state */
.table-empty-state {
    padding: var(--spacing-2xl);
    text-align: center;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
}

.table-empty-state .empty-state-illustration {
    color: var(--color-primary);
}

/* Chart empty state */
.chart-empty-state {
    padding: var(--spacing-2xl);
    text-align: center;
}

.chart-empty-state .empty-state-illustration {
    color: var(--color-primary);
}

/* Empty state with action button */
.empty-state .btn {
    margin-top: var(--spacing-md);
}

/* ==========================================================================
   Breadcrumbs
   ========================================================================== */

.breadcrumb {
    background: transparent;
    padding: 0;
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-sm);
}

.breadcrumb-item a {
    color: var(--color-text-muted);
}

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

.breadcrumb-item.active {
    color: var(--color-text);
}

.breadcrumb-item + .breadcrumb-item::before {
    color: var(--color-text-muted);
    content: "/";
}

/* ==========================================================================
   Loading States & Transitions
   ========================================================================== */

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

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

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

.btn.loading {
    position: relative;
    color: transparent;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* ==========================================================================
   Page Header
   ========================================================================== */

.page-header {
    margin-bottom: var(--spacing-lg);
}

.page-header h1 {
    margin-bottom: var(--spacing-xs);
}

.page-header .page-subtitle {
    color: var(--color-text-muted);
    font-size: var(--font-size-md);
    margin-bottom: 0;
}

/* ==========================================================================
   Icons
   ========================================================================== */

.icon {
    display: inline-block;
    vertical-align: middle;
    flex-shrink: 0;
}

.icon-xs { width: 12px; height: 12px; }
.icon-sm { width: 16px; height: 16px; }
.icon-md { width: 20px; height: 20px; }
.icon-lg { width: 24px; height: 24px; }
.icon-xl { width: 32px; height: 32px; }
.icon-2xl { width: 48px; height: 48px; }

.icon-text {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }

/* ==========================================================================
   Navbar
   ========================================================================== */

.navbar {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border-light);
    padding: 0.5rem 0;
    z-index: 1030;
}

.navbar-brand {
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-md);
    color: var(--color-text) !important;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.navbar-brand:hover {
    color: var(--color-text) !important;
    text-decoration: none;
}

.navbar-brand .brand-icon {
    opacity: 0.9;
}

.navbar-nav .nav-link {
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.navbar-nav .nav-link:hover {
    color: var(--color-text);
    background-color: rgba(0, 0, 0, 0.04);
    text-decoration: none;
}

.navbar-nav .nav-link.active {
    color: var(--color-primary);
    background-color: rgba(0, 113, 227, 0.08);
}

.navbar-nav .nav-icon {
    vertical-align: -2px;
    margin-right: 4px;
}

.navbar-toggler {
    border: none;
    padding: 0.5rem;
}

.navbar-toggler:focus {
    box-shadow: none;
}

.dropdown-menu {
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm) 0;
}

.dropdown-item {
    font-size: var(--font-size-sm);
    padding: 0.5rem 1rem;
    color: var(--color-text);
}

.dropdown-item:hover {
    background-color: var(--color-background);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border-light);
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-2xl);
}

.site-footer .footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.site-footer .footer-text {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin: 0;
}

.site-footer .footer-links {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
    margin: 0;
    padding: 0;
}

.site-footer .footer-links a {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.site-footer .footer-links a:hover {
    color: var(--color-primary);
}

.site-footer .footer-disclaimer {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin: var(--spacing-md) 0 0;
    opacity: 0.7;
}

/* ==========================================================================
   Responsive Adjustments
   ========================================================================== */

@media (max-width: 768px) {
    :root {
        --font-size-3xl: 1.5rem;
        --font-size-2xl: 1.25rem;
    }

    .stat-card {
        padding: var(--spacing-md);
    }

    .stat-value {
        font-size: var(--font-size-xl);
    }

    .filters {
        padding: var(--spacing-md);
    }

    .product-image {
        width: 60px;
        height: 60px;
    }

    .table th,
    .table td {
        padding: var(--spacing-sm);
    }

    /* Mobile table improvements */
    .table-responsive {
        position: relative;
        margin: 0 calc(var(--spacing-md) * -1);
        padding: 0 var(--spacing-md);
        border-radius: 0;
    }

    /* Ensure table has minimum width to force scroll */
    .table {
        min-width: 600px;
    }

    /* Mobile scroll hint - fade on right edge */
    .table-responsive::after {
        content: '';
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        width: 20px;
        background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.9));
        pointer-events: none;
        opacity: 1;
        transition: opacity var(--transition-fast);
    }

    /* Hide scroll hint when scrolled to end */
    .table-responsive.scrolled-end::after {
        opacity: 0;
    }

    /* Price cell wrapping on mobile */
    .price-cell {
        flex-wrap: wrap;
    }

    /* Product info mobile adjustments */
    .product-info .product-name {
        font-size: var(--font-size-sm);
    }

    .product-info .product-specs {
        font-size: 0.7rem;
    }

    /* Pagination mobile */
    .pagination {
        flex-wrap: wrap;
        justify-content: center;
    }

    .pagination-info {
        width: 100%;
        text-align: center;
        margin-bottom: var(--spacing-sm);
    }

    /* Filter presets scroll horizontally on mobile */
    .filter-presets {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding-bottom: var(--spacing-xs);
        margin-bottom: var(--spacing-sm);
    }

    .filter-presets .preset-btn {
        flex-shrink: 0;
    }

    /* Product detail page mobile */
    .product-card .row {
        flex-direction: column;
    }

    .product-card .col-md-8,
    .product-card .col-md-4 {
        width: 100%;
    }

    .product-card .col-md-4 {
        margin-top: var(--spacing-lg);
    }

    /* Notification card mobile */
    .notification-card {
        margin-top: var(--spacing-lg);
    }

    /* Chart container mobile */
    .chart-container {
        padding: var(--spacing-md);
    }

    /* Footer mobile */
    .site-footer .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .site-footer .footer-links {
        justify-content: center;
    }
}