:root {
    --primary-color: #0dcaf0;
    --secondary-color: #ffc107;
    --success-color: #198754;
    --danger-color: #dc3545;
    --info-color: #0d6efd;
    --warning-color: #fd7e14;
    --border-radius: 16px;
    --box-shadow: 0 8px 32px rgba(31, 38, 135, 0.15);
    --box-shadow-hover: 0 12px 40px rgba(31, 38, 135, 0.25);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --bg-color: #f8f9fa;
    --card-bg: rgba(255, 255, 255, 0.95);
    --glass-border: rgba(255, 255, 255, 0.5);
    --text-color: #212529;
    --text-muted: #718096;
    --border-color: #dee2e6;
}

[data-theme="dark"] {
    --primary-color: #0dcaf0;
    --secondary-color: #ffc107;
    --success-color: #198754;
    --danger-color: #dc3545;
    --info-color: #3d8bfd;
    --warning-color: #fd7e14;
    --bg-gradient: linear-gradient(135deg, #1e1e2e 0%, #2d2d44 100%);
    --bg-color: #1a1d20;
    --card-bg: rgba(37, 41, 46, 0.85);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-color: #e9ecef;
    --text-muted: #adb5bd;
    --border-color: #495057;
}

* {
    transition: background-color 0.3s ease, color 0.3s ease;
}

body {
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-color);
    min-height: 100vh;
    padding-bottom: 100px;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, sans-serif;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23000000' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.3;
    z-index: 0;
    pointer-events: none;
}

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

[data-theme="dark"] .skeleton {
    background: linear-gradient(90deg, #2a2e33 25%, #1f2326 50%, #2a2e33 75%);
    background-size: 200% 100%;
}

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

.skeleton-text {
    height: 16px;
    margin-bottom: 8px;
}

.skeleton-title {
    height: 24px;
    width: 60%;
    margin-bottom: 16px;
}

.skeleton-card {
    height: 120px;
    width: 100%;
}

/* Loading Spinner */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    min-width: 300px;
    padding: 16px 20px;
    border-radius: var(--border-radius);
    background: var(--card-bg);
    box-shadow: var(--box-shadow-hover);
    display: flex;
    align-items: center;
    gap: 12px;
    transform: translateX(400px);
    animation: slideIn 0.3s forwards;
    border-left: 4px solid;
}

.toast.hiding {
    animation: slideOut 0.3s forwards;
}

.toast-success { border-left-color: var(--success-color); }
.toast-error { border-left-color: var(--danger-color); }
.toast-warning { border-left-color: var(--warning-color); }
.toast-info { border-left-color: var(--info-color); }

.toast-icon {
    font-size: 24px;
    flex-shrink: 0;
}

.toast-success .toast-icon { color: var(--success-color); }
.toast-error .toast-icon { color: var(--danger-color); }
.toast-warning .toast-icon { color: var(--warning-color); }
.toast-info .toast-icon { color: var(--info-color); }

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-color);
}

.toast-message {
    font-size: 14px;
    color: var(--text-muted);
}

.toast-close {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: var(--transition);
}

.toast-close:hover {
    background: rgba(0, 0, 0, 0.1);
}

@keyframes slideIn {
    to { transform: translateX(0); }
}

@keyframes slideOut {
    to { transform: translateX(400px); }
}

/* Cards */
.container {
    margin-top: 2rem;
    margin-bottom: 6rem;
    max-width: 1200px;
    padding: 0 1rem;
    position: relative;
    z-index: 1;
}

.card, .glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 2rem;
    margin-bottom: 2rem;
    border: 1px solid var(--glass-border);
    transition: var(--transition);
    position: relative;
}

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

.card-title {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-weight: 600;
}

/* Forms */
.form-select, .form-control {
    border-radius: var(--border-radius);
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    color: var(--text-color);
    transition: var(--transition);
}

[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
    background-color: #1f2326;
    border-color: var(--border-color);
    color: var(--text-color);
}

.form-select:focus, .form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(13, 202, 240, 0.25);
    background-color: var(--card-bg);
}

.form-label {
    color: var(--text-color);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

/* Buttons */
.btn {
    border-radius: 32px;
    padding: 0.875rem 2rem;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    letter-spacing: 0.3px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.btn:active {
    transform: translateY(0);
}

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

.btn-primary:hover {
    background-color: #0bb8db;
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-success:hover {
    background-color: #157347;
}

.btn-warning {
    background-color: var(--secondary-color);
    color: #000;
}

.btn-warning:hover {
    background-color: #ffca2c;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: #bb2d3b;
}

.btn-info {
    background-color: var(--info-color);
    color: white;
}

.btn-info:hover {
    background-color: #0a58ca;
}

/* Quantity Controls */
.quantity-control {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 4px;
}

.quantity-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--primary-color);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: var(--transition);
}

.quantity-btn:hover {
    background: #0bb8db;
    transform: scale(1.1);
}

.quantity-btn:disabled {
    background: var(--border-color);
    cursor: not-allowed;
    transform: scale(1);
}

.quantity-input {
    width: 60px;
    text-align: center;
    border: none;
    background: transparent;
    font-weight: 600;
    color: var(--text-color);
    font-size: 16px;
}

.quantity-input:focus {
    outline: none;
}

/* Tables */
.table-responsive {
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    background: var(--card-bg);
    margin-top: 1rem;
    overflow-x: auto;
}

.table {
    margin-bottom: 0;
    color: var(--text-color);
}

.table th {
    background-color: var(--bg-color);
    border-bottom: 2px solid var(--border-color);
    padding: 1rem;
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    position: relative;
}

.table th:hover {
    background-color: var(--border-color);
}

.table th.sortable::after {
    content: '⇅';
    margin-left: 8px;
    opacity: 0.3;
}

.table th.sort-asc::after {
    content: '↑';
    opacity: 1;
}

.table th.sort-desc::after {
    content: '↓';
    opacity: 1;
}

.table td {
    padding: 1rem;
    vertical-align: middle;
    border-color: var(--border-color);
}

.table-striped > tbody > tr:nth-of-type(odd) > * {
    background-color: rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .table-striped > tbody > tr:nth-of-type(odd) > * {
    background-color: rgba(255, 255, 255, 0.02);
}

.table-hover tbody tr {
    transition: var(--transition);
}

.table-hover tbody tr:hover {
    background-color: rgba(13, 202, 240, 0.1);
    transform: scale(1.01);
}

/* Bottom Menu */
.bottom-menu {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 12px 48px rgba(31, 38, 135, 0.25);
    padding: 0.75rem;
    z-index: 1000;
    border: 1px solid var(--glass-border);
    border-radius: 32px;
    max-width: 90%;
}

.bottom-menu .btn {
    border-radius: 24px;
    padding: 0.875rem 1.75rem;
    margin: 0 0.25rem;
    font-weight: 600;
    min-width: auto;
    justify-content: center;
    position: relative;
    box-shadow: none;
}

.bottom-menu .btn i {
    font-size: 1.5rem;
}

.menu-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background: var(--danger-color);
    color: white;
    border-radius: 12px;
    padding: 2px 8px;
    font-size: 11px;
    font-weight: 600;
    min-width: 20px;
    text-align: center;
}

/* Dark Mode Toggle */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1001;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    box-shadow: var(--box-shadow);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    transition: var(--transition);
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(20deg);
    box-shadow: var(--box-shadow-hover);
}

/* Cart Widget */
.cart-widget {
    position: sticky;
    top: 20px;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 1rem;
    margin-bottom: 1rem;
    border: 2px solid var(--primary-color);
    z-index: 100;
}

.cart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.cart-title {
    font-weight: 600;
    font-size: 18px;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.cart-count {
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
}

.cart-total {
    font-size: 24px;
    font-weight: 700;
    color: var(--success-color);
}

.cart-items {
    max-height: 200px;
    overflow-y: auto;
    margin: 1rem 0;
}

.cart-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 14px;
}

.cart-empty {
    text-align: center;
    color: var(--text-muted);
    padding: 2rem 0;
    font-style: italic;
}

/* Search */
.search-box {
    position: relative;
    margin-bottom: 1rem;
}

.search-box input {
    padding-left: 40px;
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

/* Swipe Actions */
.swipe-item {
    position: relative;
    overflow: hidden;
}

.swipe-actions {
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    display: flex;
    transform: translateX(100%);
    transition: var(--transition);
}

.swipe-item.swiping .swipe-actions {
    transform: translateX(0);
}

.swipe-action {
    padding: 1rem 1.5rem;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 80px;
}

.swipe-action.delete {
    background: var(--danger-color);
}

.swipe-action.edit {
    background: var(--warning-color);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.pulse {
    animation: pulse 2s infinite;
}

/* Badges */
.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

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

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

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

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

/* Alerts */
.alert {
    border-radius: var(--border-radius);
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
    border-left: 4px solid;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: fadeIn 0.3s;
}

.alert-success {
    background: rgba(25, 135, 84, 0.1);
    border-left-color: var(--success-color);
    color: var(--success-color);
}

.alert-danger {
    background: rgba(220, 53, 69, 0.1);
    border-left-color: var(--danger-color);
    color: var(--danger-color);
}

.alert-warning {
    background: rgba(255, 193, 7, 0.1);
    border-left-color: var(--warning-color);
    color: var(--warning-color);
}

.alert-info {
    background: rgba(13, 110, 253, 0.1);
    border-left-color: var(--info-color);
    color: var(--info-color);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 0.5rem;
    }

    .bottom-menu .btn {
        font-size: 0.9rem;
        padding: 0.5rem 1rem;
    }

    .table td, .table th {
        padding: 0.75rem 0.5rem;
        font-size: 14px;
    }

    .card {
        padding: 1rem;
    }

    .toast-container {
        right: 10px;
        left: 10px;
    }

    .toast {
        min-width: auto;
        width: 100%;
    }

    .theme-toggle {
        top: 10px;
        right: 10px;
        width: 40px;
        height: 40px;
        font-size: 20px;
    }
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .bottom-menu,
    .theme-toggle,
    .btn,
    .toast-container {
        display: none !important;
    }

    body {
        background: white;
        color: black;
    }

    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}