:root {
    --primary-color: #673AB7;
    --primary-dark: #512DA8;
    --primary-light: #9575CD;
    --bg-dark: #121212;
    --bg-medium: #1E1E1E;
    --bg-light: #252525;
    --bg-hover: #2D2D2D;
    --text-primary: #FFFFFF;
    --text-secondary: #B0B0B0;
    --text-muted: #808080;
    --success: #4CAF50;
    --warning: #FF9800;
    --danger: #F44336;
    --info: #2196F3;
    --border-color: #333333;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Layout */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

.page-header {
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--primary-color);
}

.page-header h1 {
    font-size: 2rem;
    color: var(--text-primary);
}

/* Guest mode styles */
.btn:disabled {
    opacity: 0.5 !important;
    cursor: not-allowed !important;
    pointer-events: none;
}

.guest-indicator {
    color: var(--warning) !important;
    font-weight: bold;
}

/* Navigation */
.navbar {
    background: rgba(20, 20, 30, 0.95);
    padding: 0;
    border-bottom: 1px solid rgba(139, 92, 246, 0.2);
    margin-bottom: 40px;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(20px);
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    height: 60px;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.nav-brand {
    flex-shrink: 0;
}

.navbar-brand, .nav-brand h1 {
    font-size: 1.3rem;
    font-weight: 800;
    background: linear-gradient(135deg, #8b5cf6 0%, #ec4899 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    margin: 0;
    letter-spacing: -0.5px;
    transition: all 0.3s ease;
}

.navbar-brand:hover {
    transform: scale(1.05);
    filter: brightness(1.2);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    z-index: 1001;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

.nav-links {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 4px;
    transition: all 0.3s;
    white-space: nowrap;
    font-size: 0.9rem;
}

.nav-links a:hover,
.nav-links a.active {
    background-color: var(--primary-color);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.btn-logout {
    background-color: var(--danger) !important;
    color: white !important;
    border: none !important;
    padding: 6px 12px !important;
    font-size: 0.85rem !important;
    margin-left: 10px;
}

.btn-logout:hover {
    background-color: #d32f2f !important;
}

.navbar-menu {
    display: flex;
    gap: 2px;
    list-style: none;
    align-items: center;
    background: rgba(255, 255, 255, 0.02);
    padding: 4px;
    border-radius: 50px;
    backdrop-filter: blur(10px);
}

.navbar-menu a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 50px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
    font-size: 0.85rem;
    position: relative;
    white-space: nowrap;
}

.navbar-menu a:hover {
    color: rgba(255, 255, 255, 0.95);
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-1px);
}

.navbar-menu a.active {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
    font-weight: 600;
}

.navbar-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 40%;
    height: 2px;
    background: linear-gradient(90deg, transparent, #ec4899, transparent);
    border-radius: 2px;
}

.navbar-user {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 50px;
    border: 1px solid rgba(139, 92, 246, 0.2);
}

.navbar-user span {
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
    font-size: 0.85rem;
}

.navbar-user .btn {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
    border: none;
    padding: 6px 16px;
    font-size: 0.8rem;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
}

.navbar-user .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.5);
    filter: brightness(1.1);
}

/* Cards */
.card {
    background-color: var(--bg-medium);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.card-body {
    color: var(--text-secondary);
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background-color: var(--bg-light);
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-card.success {
    border-left-color: var(--success);
}

.stat-card.warning {
    border-left-color: var(--warning);
}

.stat-card.danger {
    border-left-color: var(--danger);
}

.stat-card.info {
    border-left-color: var(--info);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    margin: 10px 0;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.95rem;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

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

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

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

.btn-success:hover {
    background-color: #45a049;
}

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

.btn-warning:hover {
    background-color: #e68a00;
}

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

.btn-danger:hover {
    background-color: #d32f2f;
}

.btn-secondary {
    background-color: var(--bg-light);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-hover);
}

.btn-sm {
    padding: 5px 12px;
    font-size: 0.85rem;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-secondary);
    font-weight: 500;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 10px;
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-textarea {
    resize: vertical;
    min-height: 80px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

/* Tables */
.table-container {
    overflow-x: auto;
}

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

.table thead {
    background-color: var(--bg-light);
}

.table th {
    padding: 12px;
    text-align: left;
    color: var(--text-secondary);
    font-weight: 600;
    border-bottom: 2px solid var(--border-color);
}

.table td {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
}

.table tbody tr {
    transition: background-color 0.2s;
}

.table tbody tr:hover {
    background-color: var(--bg-hover);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 500;
}

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

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

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

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

.badge-secondary {
    background-color: var(--bg-light);
    color: var(--text-secondary);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--bg-medium);
    padding: 30px;
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-footer {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* Alert Container */
#alert-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 9999;
    max-width: 400px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Alerts */
.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.alert-success {
    background-color: rgba(76, 175, 80, 0.2);
    border-left: 4px solid var(--success);
    color: var(--success);
}

.alert-danger {
    background-color: rgba(244, 67, 54, 0.2);
    border-left: 4px solid var(--danger);
    color: var(--danger);
}

.alert-warning {
    background-color: rgba(255, 152, 0, 0.2);
    border-left: 4px solid var(--warning);
    color: var(--warning);
}

.alert-info {
    background-color: rgba(33, 150, 243, 0.2);
    border-left: 4px solid var(--info);
    color: var(--info);
}

/* Login Page */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-medium) 100%);
}

.login-card {
    background-color: var(--bg-medium);
    padding: 40px;
    border-radius: 12px;
    width: 100%;
    max-width: 400px;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-title {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.login-subtitle {
    color: var(--text-muted);
}

/* Utilities */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }
.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mb-3 { margin-bottom: 30px; }

.flex {
    display: flex;
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.gap-1 { gap: 10px; }
.gap-2 { gap: 20px; }

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

.loading::after {
    content: '...';
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0%, 20% { content: '.'; }
    40% { content: '..'; }
    60%, 100% { content: '...'; }
}

@keyframes pulse {
    0%, 100% { 
        transform: scale(1); 
        background-color: var(--danger);
    }
    50% { 
        transform: scale(1.05); 
        background-color: #d32f2f;
    }
}

.btn.confirm-delete {
    background-color: #d32f2f !important;
    font-weight: bold;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar-container {
        padding: 0 15px;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        left: -100%;
        width: 280px;
        height: 100vh;
        background-color: var(--bg-medium);
        flex-direction: column;
        justify-content: flex-start;
        align-items: stretch;
        padding: 80px 20px 20px;
        transition: left 0.3s ease;
        z-index: 1000;
        box-shadow: 2px 0 10px rgba(0, 0, 0, 0.3);
        border-right: 3px solid var(--primary-color);
        gap: 0;
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .nav-links a {
        width: 100%;
        padding: 15px;
        border-radius: 8px;
        margin-bottom: 5px;
        border-left: 4px solid transparent;
        font-size: 1rem;
    }
    
    .nav-links a:hover,
    .nav-links a.active {
        border-left-color: var(--primary-color);
        background-color: rgba(103, 58, 183, 0.1);
        transform: none;
    }
    
    .btn-logout {
        width: 100% !important;
        margin-left: 0 !important;
        margin-top: 20px !important;
        text-align: center !important;
    }
    
    .navbar .container {
        flex-direction: column;
        gap: 15px;
    }
    
    .navbar-menu {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 95%;
        padding: 20px;
    }
}

@media (max-width: 1024px) and (min-width: 769px) {
    .nav-links {
        gap: 10px;
    }
    
    .nav-links a {
        font-size: 0.85rem;
        padding: 6px 10px;
    }
}

@media (max-width: 1200px) and (min-width: 1025px) {
    .nav-links a {
        font-size: 0.9rem;
        padding: 7px 11px;
    }
}

/* Tab buttons */
.tab-buttons {
    display: flex;
    gap: 10px;
}

.tab-btn {
    padding: 8px 20px;
    background-color: var(--bg-light);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    background-color: var(--bg-hover);
}

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

/* Bulk stock management */
.item-checkbox {
    transform: scale(1.2);
    cursor: pointer;
}

.item-checkbox:checked {
    accent-color: var(--primary-color);
}

input[id^="qty-"] {
    text-align: center;
    font-size: 0.9rem;
}

input[id^="qty-"]:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(103, 58, 183, 0.2);
}