body {
    background: linear-gradient(135deg, #0a0f1e 0%, #0a1a2f 100%);
    font-family: 'Segoe UI', Arial, sans-serif;
    color: #e0e0e0;
    min-height: 100vh;
    transition: all 0.3s ease;
}

/* Light Theme */
body.light-theme {
    background: linear-gradient(135deg, #e0e0e0 0%, #ffffff 100%);
    color: #1a1a2e;
}

body.light-theme .card,
body.light-theme .temp-card,
body.light-theme .control-card,
body.light-theme .health-card {
    background: #ffffff;
    border-color: #00d4ff;
    color: #1a1a2e;
}

body.light-theme .navbar {
    background: #ffffff !important;
    border-bottom-color: #00d4ff;
}

body.light-theme .navbar-brand {
    color: #1a1a2e !important;
}

body.light-theme .form-select,
body.light-theme .form-control {
    background: #f0f0f0;
    color: #1a1a2e;
    border-color: #00d4ff;
}

body.light-theme .text-muted {
    color: #555 !important;
}

.navbar {
    background: #0a0a1a !important;
    border-bottom: 1px solid #00d4ff;
    padding: 15px 0;
}

.main-container {
    margin-top: 30px;
}

.card {
    background: rgba(20, 25, 45, 0.95);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: 15px;
    color: white;
    transition: all 0.3s ease;
}

.temp-card {
    transition: transform 0.2s;
}

.temp-card:hover {
    transform: translateY(-5px);
    border-color: #00d4ff;
}

.temp-value {
    font-size: 2.5rem;
    font-weight: bold;
}

.temp-unit {
    font-size: 1rem;
    color: #888;
}

.progress {
    height: 8px;
    border-radius: 10px;
    background: #333;
    margin: 10px 0;
}

.progress-bar {
    border-radius: 10px;
    transition: width 0.3s;
}

.form-control, .form-select {
    background: #1a1a2e;
    border: 1px solid #00d4ff;
    color: white;
}

.form-control:focus, .form-select:focus {
    background: #1a1a2e;
    border-color: #00ff88;
    color: white;
}

.btn {
    border-radius: 8px;
    padding: 8px 16px;
    transition: all 0.2s;
}

.btn:hover {
    transform: scale(1.02);
}

.alert-panel {
    background: rgba(0, 0, 0, 0.3);
}

.temp-safe { color: #00ff88; }
.temp-warning { color: #ffaa00; }
.temp-critical { color: #ff6600; }
.temp-emergency { color: #ff0033; }

::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: #1a1a2e;
}
::-webkit-scrollbar-thumb {
    background: #00d4ff;
    border-radius: 5px;
}

@media (max-width: 768px) {
    .temp-value { font-size: 1.8rem; }
    h2 { font-size: 1.2rem; }
    .btn { padding: 6px 12px; font-size: 0.8rem; }
}