:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --info-color: #17a2b8;
    --light-bg: #ecf0f1;
    --dark-bg: #34495e;
    --text-color: #2c3e50;
    --light-text: #7f8c8d;
    --white: #ffffff;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--text-color);
}

/* Login Page Styles */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.login-card {
    background: var(--white);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.login-card h1 {
    color: var(--primary-color);
    margin-bottom: 30px;
    font-size: 2rem;
    font-weight: 300;
}

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

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

.form-control {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 16px;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: var(--secondary-color);
    color: var(--white);
    width: 100%;
}

.btn-primary:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

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

.btn-danger:hover {
    background: #c0392b;
}

/* Dashboard Layout */
.dashboard-container {
    display: flex;
    min-height: 100vh;
    background: var(--light-bg);
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--primary-color);
    color: var(--white);
    flex-shrink: 0;
    transition: var(--transition);
}

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

.sidebar-header h2 {
    font-size: 1.2rem;
    font-weight: 300;
}

.sidebar-nav {
    list-style: none;
    padding: 0;
}

.sidebar-nav li {
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-nav a {
    display: block;
    padding: 15px 20px;
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    background: rgba(255,255,255,0.1);
    padding-left: 30px;
}

.sidebar-nav a.has-submenu::after {
    content: '▼';
    position: absolute;
    right: 20px;
    font-size: 12px;
    transition: var(--transition);
}

.sidebar-nav a.has-submenu.collapsed::after {
    transform: rotate(-90deg);
}

.submenu {
    background: rgba(0,0,0,0.2);
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.3s ease;
}

.submenu.show {
    max-height: 200px;
}

.submenu a {
    padding-left: 40px;
    font-size: 14px;
    color: rgba(255,255,255,0.8);
}

.submenu a:hover {
    color: var(--white);
    background: rgba(255,255,255,0.1);
    padding-left: 50px;
}

/* Disabled sidebar links */
.sidebar-nav a.disabled,
.submenu a.disabled {
    color: rgba(255,255,255,0.5) !important;
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 0;
    overflow-x: hidden;
}

.header {
    background: var(--white);
    padding: 20px 30px;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    color: var(--primary-color);
    font-weight: 300;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.content {
    padding: 30px;
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.dashboard-card {
    background: var(--white);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.dashboard-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--secondary-color);
}

.dashboard-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.dashboard-card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-weight: 500;
}

.dashboard-card .value {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--secondary-color);
    margin-bottom: 10px;
}

.dashboard-card .label {
    color: var(--light-text);
    font-size: 14px;
}

.dashboard-card.success::before { background: var(--success-color); }
.dashboard-card.warning::before { background: var(--warning-color); }
.dashboard-card.danger::before { background: var(--accent-color); }
.dashboard-card.info::before { background: var(--info-color); }

.dashboard-card.success .value { color: var(--success-color); }
.dashboard-card.warning .value { color: var(--warning-color); }
.dashboard-card.danger .value { color: var(--accent-color); }
.dashboard-card.info .value { color: var(--info-color); }

/* Disabled/Mute state for cards */
.dashboard-card.disabled {
    background: #f3f4f6; /* light gray */
    color: #9aa0a6;      /* muted text */
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
    cursor: not-allowed;
    filter: grayscale(40%);
    pointer-events: none; /* make the whole card non-interactive */
}

.dashboard-card.disabled::before {
    background: #c0c4cc; /* neutral gray border strip */
}

.dashboard-card.disabled h3 {
    color: #6b7280;
}

.dashboard-card.disabled .value,
.dashboard-card.disabled .label {
    color: #9aa0a6 !important; /* override success/info/warning colors */
}

.dashboard-card.disabled:hover {
    transform: none;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

/* Events Log */
.events-container {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.events-header {
    padding: 20px;
    background: var(--primary-color);
    color: var(--white);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.events-list {
    max-height: 400px;
    overflow-y: auto;
}

.event-item {
    padding: 15px 20px;
    border-bottom: 1px solid #eee;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: var(--transition);
}

.event-item:hover {
    background: var(--light-bg);
}

.event-icon {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

.event-icon.info { background: var(--info-color); }
.event-icon.success { background: var(--success-color); }
.event-icon.warning { background: var(--warning-color); }
.event-icon.error { background: var(--accent-color); }

.event-content {
    flex: 1;
}

.event-message {
    font-weight: 500;
    margin-bottom: 5px;
}

.event-meta {
    font-size: 12px;
    color: var(--light-text);
}

/* Building Selector */
.building-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.building-card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.building-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.building-card.selected {
    border: 2px solid var(--secondary-color);
}

.building-header {
    padding: 20px;
    background: linear-gradient(135deg, var(--secondary-color), #2980b9);
    color: var(--white);
}

.building-body {
    padding: 20px;
}

.building-name {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 10px;
}

.building-address {
    font-size: 14px;
    opacity: 0.9;
}

.building-status {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    margin-top: 10px;
}

.status-online {
    background: rgba(39, 174, 96, 0.1);
    color: var(--success-color);
}

.status-offline {
    background: rgba(231, 76, 60, 0.1);
    color: var(--accent-color);
}

/* Alerts */
.alert {
    padding: 15px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    border-left: 4px solid;
}

.alert-success {
    background: rgba(39, 174, 96, 0.1);
    border-color: var(--success-color);
    color: var(--success-color);
}

.alert-error {
    background: rgba(231, 76, 60, 0.1);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.alert-warning {
    background: rgba(243, 156, 18, 0.1);
    border-color: var(--warning-color);
    color: var(--warning-color);
}

.alert-info {
    background: rgba(23, 162, 184, 0.1);
    border-color: var(--info-color);
    color: var(--info-color);
}

/* Loading Spinner */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: var(--white);
    animation: spin 1s ease-in-out infinite;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        position: fixed;
        top: 0;
        left: -100%;
        z-index: 1000;
        height: 100vh;
        transition: left 0.3s ease;
    }
    
    .sidebar.show {
        left: 0;
    }
    
    .dashboard-container {
        flex-direction: column;
    }
    
    .main-content {
        width: 100%;
    }
    
    .header {
        padding: 15px 20px;
    }
    
    .content {
        padding: 20px;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .building-grid {
        grid-template-columns: 1fr;
    }
}

/* Print Styles */
@media print {
    .sidebar,
    .header .user-info {
        display: none;
    }
    
    .main-content {
        width: 100%;
    }
    
    .dashboard-card {
        break-inside: avoid;
    }
}

/* Valve status box (diagnostic details) */
.valve-status {
    margin-top: 16px;
    background: var(--white);
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 14px;
}
.valve-status h4 {
    margin-bottom: 10px;
    color: var(--primary-color);
}
.valve-grid {
    display: grid;
    grid-template-columns: repeat(6, minmax(70px, 1fr));
    gap: 10px;
}
.valve-chip {
    border-radius: 8px;
    padding: 10px 8px;
    text-align: center;
    font-weight: 600;
    box-shadow: var(--shadow);
}
.valve-chip.ok {
    background: rgba(39, 174, 96, 0.1);
    color: var(--success-color);
    border-left: 4px solid var(--success-color);
}
.valve-chip.err {
    background: rgba(231, 76, 60, 0.1);
    color: var(--accent-color);
    border-left: 4px solid var(--accent-color);
}