:root {
    --primary: #4CAF50;
    --secondary: #2196F3;
    --danger: #f44336;
    --warning: #ff9800;
    --success: #4CAF50;
    --dark: #212121;
    --light: #f5f5f5;
    --border: #e0e0e0;
    --sidebar-width: 260px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--light);
    color: var(--dark);
    min-width: 1200px;
}

/* Mobile Warning */
.mobile-warning {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    justify-content: center;
    align-items: center;
    z-index: 9999;
    text-align: center;
    padding: 20px;
}

.mobile-warning-content {
    background: white;
    padding: 40px;
    border-radius: 12px;
    max-width: 400px;
}

.mobile-warning-content i {
    font-size: 64px;
    color: var(--warning);
    margin-bottom: 20px;
}

.mobile-warning-content h2 {
    color: var(--dark);
    margin-bottom: 15px;
}

.mobile-warning-content p {
    color: #666;
    line-height: 1.6;
}

@media (max-width: 768px) {
    .mobile-warning {
        display: flex !important;
    }
    #login-screen,
    #dashboard-screen {
        display: none !important;
    }
}

/* Screens */
.screen {
    display: none;
}

.screen.active {
    display: flex;
}

/* Login Screen */
#login-screen {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    justify-content: center;
    align-items: center;
}

.login-container {
    width: 450px;
    padding: 20px;
}

.login-card {
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    text-align: center;
}

.logo {
    width: 80px;
    height: 80px;
    object-fit: contain;
    margin-bottom: 20px;
}

.login-card h1 {
    color: var(--primary);
    margin-bottom: 10px;
}

.subtitle {
    color: #666;
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--dark);
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.3s;
}

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

.btn-primary {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

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

.error-message {
    margin-top: 15px;
    padding: 10px;
    background: #ffebee;
    color: var(--danger);
    border-radius: 6px;
    display: none;
}

.error-message.show {
    display: block;
}

/* Dashboard Layout */
#dashboard-screen {
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--dark);
    color: white;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header {
    padding: 20px;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-logo {
    width: 60px;
    height: 60px;
    object-fit: contain;
    margin-bottom: 10px;
}

.sidebar-header h2 {
    font-size: 20px;
    color: var(--primary);
}

.sidebar-nav {
    flex: 1;
    padding: 20px 0;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    transition: all 0.3s;
}

.nav-item:hover {
    background: rgba(255,255,255,0.1);
    color: white;
}

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

.nav-item i {
    width: 24px;
    margin-right: 12px;
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.user-info {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    font-size: 14px;
}

.user-info i {
    margin-right: 10px;
    font-size: 20px;
}

.btn-logout {
    width: 100%;
    padding: 10px;
    background: transparent;
    color: rgba(255,255,255,0.7);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
}

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

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    width: calc(100% - var(--sidebar-width));
}

.top-bar {
    background: white;
    padding: 20px 30px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.top-bar h1 {
    font-size: 24px;
}

.connection-status {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: #e8f5e9;
    color: var(--success);
    border-radius: 20px;
    font-size: 14px;
}

.connection-status i {
    font-size: 10px;
}

.content-area {
    padding: 30px 50px;
    width: 100%;
}

.content-section {
    display: none;
}

.content-section.active {
    display: block;
}

/* Dashboard Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
    margin-bottom: 40px;
}

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    gap: 15px;
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
}

.stat-icon.blue { background: #2196F3; }
.stat-icon.green { background: #4CAF50; }
.stat-icon.orange { background: #ff9800; }
.stat-icon.red { background: #f44336; }

.stat-info h3 {
    font-size: 32px;
    margin-bottom: 5px;
}

.stat-info p {
    color: #666;
    font-size: 14px;
}

.cards-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.card h3 {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Section Header */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.section-header h2 {
    font-size: 20px;
}

/* Items Grid */
.items-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.item-card {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    width: 100%;
}

.item-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.item-card-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 15px;
}

.item-card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--dark);
}

.item-card-actions {
    display: flex;
    gap: 8px;
}

.btn-icon {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.btn-icon.edit {
    background: #e3f2fd;
    color: #2196F3;
}

.btn-icon.delete {
    background: #ffebee;
    color: #f44336;
}

.btn-icon:hover {
    opacity: 0.8;
}

.item-card-body {
    color: #666;
    font-size: 14px;
}

.item-card-body p {
    margin: 8px 0;
}

/* Nested greenhouse cards */
.item-card-body > div {
    margin-top: 25px;
    padding-top: 25px;
    border-top: 2px solid var(--border);
}

.item-card-body .item-card {
    margin-bottom: 20px;
    background: #f8f9fa;
    border-left: 4px solid var(--primary);
}

.item-card-body .item-card:last-child {
    margin-bottom: 0;
}

/* Items List */
.items-list {
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    overflow: hidden;
}

.list-item {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s;
}

.list-item:hover {
    background: #f9f9f9;
}

.list-item:last-child {
    border-bottom: none;
}

.list-item-info {
    flex: 1;
}

.list-item-title {
    font-weight: 600;
    margin-bottom: 5px;
}

.list-item-subtitle {
    font-size: 14px;
    color: #666;
}

.badge {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.badge.success {
    background: #e8f5e9;
    color: var(--success);
}

.badge.warning {
    background: #fff3e0;
    color: var(--warning);
}

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

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 12px;
    padding: 40px;
    width: 1000px;
    max-height: 85vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-header h2 {
    font-size: 20px;
}

.btn-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: #666;
}

.modal-body {
    margin-bottom: 20px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.btn-secondary {
    padding: 10px 20px;
    background: #e0e0e0;
    color: var(--dark);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-secondary:hover {
    background: #d0d0d0;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* Loading */
.loading {
    text-align: center;
    padding: 40px;
    color: #666;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}

.empty-state i {
    font-size: 48px;
    margin-bottom: 15px;
    display: block;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: white;
    border-radius: 8px;
    width: 1000px;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

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

.modal-header h2 {
    margin: 0;
    font-size: 1.5rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: #999;
    line-height: 1;
}

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

.modal-body {
    padding: 20px;
}

.form-group {
    margin-bottom: 15px;
}

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

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="email"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 14px;
    font-family: inherit;
}

.form-group textarea {
    resize: vertical;
}

.form-group input[type="checkbox"] {
    margin-right: 8px;
}

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

.btn-primary, .btn-secondary {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
}

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

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

.btn-secondary {
    background: #ddd;
    color: var(--dark);
}

.btn-secondary:hover {
    background: #ccc;
}